Science.gov

Sample records for nierenarterienstenose technische ergebnisse

  1. Studying at the Universities of the Armed Forces: Comparative Results from the 1999 Student Questionnaire (Studieren an den UniBw: Vergleichende Ergebnisse aus der Studentenbefragung 1999)

    DTIC Science & Technology

    2002-12-01

    Studenten 1999 UmiBw Hamburg UniBw Miinchen technische nichtt. technische nicdtt. Angaben in Prozent Fficher Ficher Ficher Ficher Gesamt Basis: Abe Befi’aten...GroBstadtszene? Tabelle 3 Frage: Dies 1I5t sich im einzelnen noch niher beschreiben: UniBw Studenten 1999 UniBw Hamburg UniBw Mfinchen technische nichtL... technische nichtt. Angaben in Prozent Ficher Ficher Ficher Ficher Gesamt Basis Alle Befragten 253 471 300 355 1382 stimme zu 42,70% 48,6% 37,3% 42,5

  2. Vorausschauend Planen, Gezielt Handeln — Über Die Regelung Und Steuerung Technischer Prozesse

    NASA Astrophysics Data System (ADS)

    Grüne, Lars; Sager, Sebastian; Allgöwer, Frank; Bock, Hans Georg; Diehl, Moritz

    Seit Beginn der industriellen Revolution nimmt die Steuerungs- und Regelungstechnik eine Schlüsselstellung in vielen technischen Bereichen ein. James Watts Fliehkraftregler für Dampfmaschinen ist eines der frühen Beispiele eines extrem erfolgreichen Reglerkonzepts, von dem Ende der 1860er Jahre geschätzte 75000 Exemplare allein in England im Einsatz waren [2, S. 24]. Etwa um diese Zeit begannen Ingenieure, motiviert durch die immer höhere Komplexität der zu regelnden Maschinen, sich systematisch mit theoretischen Grundlagen der Regelung zu beschäftigen. Dies führte unausweichlich zu der Einsicht, dass das dynamische Verhalten der geregelten Systeme nur mit Hilfe der Mathematikverstanden und weiterentwickelt werden konnte, oder wie Werner von Siemens, ein weiterer technischer Pionier in diesem Bereich es formulierte: "Ohne Mathematik tappt man doch immer im Dunkeln.“

  3. Photogrammetry and Remote Sensing in the MSc Program "ESPACE" at Technische Universitaet Muenchen

    NASA Astrophysics Data System (ADS)

    Stilla, U.; Iwaszczuk, D.; Pail, R.

    2014-04-01

    ESPACE is an interdisciplinary Master's study programme of Technische Universitaet Muenchen (TUM) positioned at the interface between space technology and the engineering and natural science-based use of satellite data. It combines the technical aspects of the satellite and observation systems with scientific and commercial applications. A core topic beside space engineering and satellite applications engineering is satellite and remote sensing data analysis. This paper explains the background and goals of the Masters's study programme, addresses the target groups and qualification profile, and gives an overview about the specialization fields. The special role of Photogrammetry and Remote Sensing is further explained in this context. The structure and embedding of international alliances by a double degree program with Wuhan University is shown.

  4. Report of Research at Technische Universitaet Darmstadt on Ultrahard Materials in the B-C-N-Si System

    DTIC Science & Technology

    2015-06-01

    153 A nanoporous silica matrix was soaked with liquid cyanamide (CH2N2) and dried. The carbon nitride material was obtained via heating the... Materials in the B-C-N-Si System edited by Ralf Riedel Technische Universität Darmstadt Fachbereich Material - und Geowissenschaften Fachgebiet... Materials Research Directorate, ARL Aberdeen Proving Ground, MD 21005-5066 under contract W911NF-09-1-0576 Approved for public release

  5. Optical dimensional metrology at Physikalisch-Technische Bundesanstalt (PTB) on deep sub-wavelength nanostructured surfaces

    NASA Astrophysics Data System (ADS)

    Bodermann, B.; Ehret, G.; Endres, J.; Wurm, M.

    2016-06-01

    The dark-field microscopy method with alternating grazing incidence UV illumination (UV-AGID) developed at Physikalisch-Technische Bundesanstalt offers the possibility of measuring individual isolated line structures with linewidths down to the sub-wavelength regime. In contrast, scatterometry is able and already widely used to measure average dimensional parameters of periodic structures down to the deep sub-wavelength regime. Both methods can be used for dimensional measurements of micro- and nanostructures, in particular the critical dimensions (CDs) on wafers or photomasks in the semiconductor industry, complementing each other favourably. Based on numerical simulations, we have investigated the ultimate limits of these two methods in the deep sub-wavelength regime. It has been shown that AGID microscopy in the DUV spectral range is in principle capable of measuring line structures with CDs down to a few 10 nm, depending on the structure material. For scatterometry, no fundamental limit has been observed. In practice, a technical limit due to the limited signal-to-noise ratio is expected for CDs of a few nm in width.

  6. [The First Bilateral Arm Transplantation in the Klinikum rechts der Isar, Technische Universität München.

    PubMed

    Machens, H-G

    2008-08-27

    From July 25 through to July 26, 2008, after many years of preparation, the world-wide first transplantation of complete arms was carried out at the Klinikum rechts der Isar, Technische Universität München. The patient is as well as can be expected under the circumstances. The Clinic for Plastic Surgery and Hand Surgery (head: Hans-Günther Machens) was responsible for the operation. The operation in which a team of 40 members participated was headed by Christoph Höhnke (head of the transplantation team) and Edgar Biemer (former long-standing head of the Department for Plastic Surgery).

  7. Analysis of beta-decay data acquired at the Physikalisch-Technische Bundesanstalt: Evidence of a solar influence

    NASA Astrophysics Data System (ADS)

    Sturrock, P. A.; Steinitz, G.; Fischbach, E.; Parkhomov, A.; Scargle, J. D.

    2016-11-01

    According to an article entitled Disproof of solar influence on the decay rates of 90Sr/90Y by Kossert and Nähle of the Physikalisch-Technische Bundesanstalt (PTB) [1], the PTB measurements show no evidence of variability. We show that, on the contrary, those measurements reveal strong evidence of variability, including an oscillation at 11 year-1 that is suggestive of an influence of internal solar rotation. An analysis of radon beta-decay data acquired at the Geological Survey of Israel (GSI) Laboratory for the same time interval yields strong confirmation of this oscillation.

  8. Deutsches "Nationales Krebshilfe-Monitoring" 2015-2019 - Studienprotokoll und erste Ergebnisse.

    PubMed

    Schneider, Sven; Görig, Tatiana; Schilling, Laura; Breitbart, Eckhard W; Greinert, Rüdiger; Diehl, Katharina

    2017-09-01

    Das Projekt "Nationales Krebshilfe-Monitoring zur Solariennutzung" (National Cancer Aid Monitoring of Tanning Bed Use, NCAM) ist eine deutsche Großstudie mit dem Ziel, die wichtigsten Risikofaktoren für Hautkrebs zu beobachten: natürliches Sonnenlicht und künstliche UV-Strahlung. NCAM ist eine bundesweite Querschnittstudie mit zunächst vier Runden der Datenerfassung (sogenannten Wellen) zwischen 2015 und 2018. Jedes Jahr wird eine bundesweit repräsentative Stichprobe aus 3.000 Personen im Alter von 14 bis 45 Jahren befragt. Die Querschnittsbefragung wird durch eine Kohorte von n = 450 aktuellen Solariennutzern ergänzt. Die erste Welle im Jahr 2015 ergab eine Gesamtprävalenz der Solariennutzung von 29,5 %. Elf Prozent aller Teilnehmer hatten in den vergangenen zwölf Monaten ein Solarium genutzt. Zu den Determinanten der aktuellen Solariennutzung gehörten jüngeres Alter, weibliches Geschlecht und Vollzeit-/Teilzeitbeschäftigung. Die hauptsächlichen Beweggründe, die für die Nutzung eines Solariums genannt wurden, waren Entspannung und Attraktivitätssteigerung. NCAM ist weltweit die erste Studie zur Überwachung der Risikofaktoren für Hautkrebs in jährlichen Intervallen anhand einer großen, landesweit repräsentativen Stichprobe. Erste Ergebnisse deuten darauf hin, dass Millionen Deutsche trotz Warnungen der WHO Solarien nutzen, und dass viele dieser Nutzer Jugendliche sind - trotz gesetzlicher Beschränkungen, die das Ziel haben, die Nutzung von Solarien durch Minderjährige zu verhindern. © 2017 Deutsche Dermatologische Gesellschaft (DDG). Published by John Wiley & Sons Ltd.

  9. [Cardiodoron® bei Patienten mit Schlafstörungen - Ergebnisse einer prospektiven Beobachtungsstudie].

    PubMed

    Rother, Claudia; Schnelle, Martin

    2017-01-01

    Hintergrund: Schlafstörungen gehören zu den häufigsten gesundheitlichen Problemen der heutigen Zeit. Stress und die dadurch bedingte innere Anspannung sowie eine unrhythmische Lebensführung z.B. durch Schichtarbeit sind bekannte auslösende Faktoren. Weniger bekannt ist, dass auch funktionelle Herz-Kreislauf-Beschwerden zu Störungen des Schlafs führen können und dass deren Behandlung zu einer Verbesserung der Schlafqualität beiträgt. Ganzheitlich betrachtet geht es daher um die Wiederherstellung einer gesunden Rhythmik, insbesondere des Herz-/Atem- sowie des Schlaf-Wach-Rhythmus, die Cardiodoron®, eine Heilpflanzenkomposition aus Primula veris, Hyoscyamus niger und Onopordum acanthium, unterstützt. Patienten und Methoden: Mittels einer prospektiven, multizentrischen Beobachtungsstudie sollte ermittelt werden, wie sich funktionelle Herz-Kreislauf-Beschwerden und/oder Schlafstörungen unter der Behandlung mit Cardiodoron® (Dilution) über 3-6 Monate entwickeln. Im Zeitraum von September 2009 bis März 2012 dokumentierten 92 Ärzte 501 Patienten, von denen 380 über Schlafstörungen klagten und deren Daten in dieser Publikation näher betrachtet werden. Nach einer Aufnahmeuntersuchung erfolgte nach 90 Tagen eine Abschlussuntersuchung und bei Fortführung der Therapie nach nochmals 90 Tagen eine Follow-up-Untersuchung. Neben 30 ärztlicherseits bewerteten Symptomen beurteilten die Patienten ihr Befinden mittels Pittsburgh Sleep Quality Index (PSQI) nach Buysse und der Beschwerden-Liste nach von Zerssen (B-L und B-L'). Ergebnisse: Unter der Cardiodoron®-Therapie gingen bei guter Verträglichkeit sowohl die Ausprägung der Schlafstörungen (um 65% von 2,0 auf 0,7 Punkte) als auch die erfassten 30 Symptome (um 59% von 24,3 auf 9,9 Punkte) deutlich zurück (p < 0,01). Weiterhin reduzierten sich der PSQI und der Gesamtwert der Beschwerden-Liste signifikant (p < 0,0001) um 60% bzw. 56% (von 12,2 auf 4,8 bzw. von 25,6 auf 11,4 Punkte). Schlussfolgerungen: Bei

  10. Comparative study of beta-decay data for eight nuclides measured at the Physikalisch-Technische Bundesanstalt

    NASA Astrophysics Data System (ADS)

    Sturrock, P. A.; Fischbach, E.; Javorsek, D.; Jenkins, J. H.; Lee, R. H.; Nistor, J.; Scargle, J. D.

    2014-07-01

    We present the results of time-series analyses of data, kindly provided by the Physikalisch-Technische Bundesanstalt, concerning the beta-decays of Ag108, Ba133, Cs137, Eu152, Eu154, Kr85, Ra226, and Sr90. From measurements of the detector currents, we find evidence of annual oscillations (especially for Ra226), and for several solar r-mode oscillations. It is notable that the frequencies of these r-mode oscillations correspond to exactly the same sidereal rotation rate (12.08 year-1) that we have previously identified in r-mode oscillations detected in both Mt Wilson solar diameter data and Lomonosov Moscow State University Sr90 beta-decay data. Ba133 is found to be anomalous in that current measurements for this nuclide have a much larger variation (by 4 σ) than those of the other nuclides. It is interesting that analysis of variability measurements in the PTB files yields strong evidence for an oscillation for Ba133 but only weak evidence for Ra226.

  11. Power Spectrum Analysis of Physikalisch-Technische Bundesanstalt Decay-Rate Data: Evidence for Solar Rotational Modulation

    NASA Astrophysics Data System (ADS)

    Sturrock, P. A.; Buncher, J. B.; Fischbach, E.; Gruenwald, J. T.; Javorsek, D.; Jenkins, J. H.; Lee, R. H.; Mattes, J. J.; Newport, J. R.

    2010-12-01

    Evidence for an anomalous annual periodicity in certain nuclear-decay data has led to speculation on a possible solar influence on nuclear processes. We have recently analyzed data concerning the decay rates of 36Cl and 32Si, acquired at the Brookhaven National Laboratory (BNL), to search for evidence that might be indicative of a process involving solar rotation. Smoothing of the power spectrum by weighted-running-mean analysis leads to a significant peak at frequency 11.18 year-1, which is lower than the equatorial synodic rotation rates of the convection and radiative zones. This article concerns measurements of the decay rates of 226Ra acquired at the Physikalisch-Technische Bundesanstalt (PTB) in Germany. We find that a similar (but not identical) analysis yields a significant peak in the PTB dataset at frequency 11.21 year-1, and a peak in the BNL dataset at 11.25 year-1. The change in the BNL result is not significant, since the uncertainties in the BNL and PTB analyses are estimated to be 0.13 year-1 and 0.07 year-1, respectively. Combining the two running means by forming the joint power statistic leads to a highly significant peak at frequency 11.23 year-1. We will briefly comment on the possible implications of these results for solar physics and for particle physics.

  12. The source-sample stage of the new two-dimensional angular correlation of annihilation radiation spectrometer at Technische Universitaet Muenchen

    SciTech Connect

    Ceeh, Hubert; Weber, Josef Andreas; Boeni, Peter; Leitner, Michael; Hugenschmidt, Christoph

    2013-04-15

    Angular correlation of annihilation radiation (ACAR) is a well established technique for the investigation of the electronic structure. A major limitation of ACAR studies is the available positron flux at a small spot on the sample. For this reason, the focus of this work is put on the discussion of a newly developed source-sample stage of the new 2D-ACAR spectrometer at Technische Universitaet Muenchen which uses an optimized static magnetic field configuration to guide the positrons onto the sample. The achieved spot diameter is d{sub FWHM}= 5.4 mm, with a high efficiency over the whole energy spectrum of the {sup 22}Na positron source. The implications of the performance of the source-sample stage are discussed with regard to 2D-ACAR measurements of single crystalline {alpha}-quartz, which serves as a model system for the determination of the total resolution. A value of (1.53 Multiplication-Sign 1.64) mrad{sup 2} FWHM was achieved at room temperature.

  13. Analysis of beta-decay rates for Ag 108, Ba 133, Eu 152, Eu 154, Kr 85, Ra 226, and Sr 90, measured at the Physikalisch-Technische Bundesanstalt from 1990 to 1996

    SciTech Connect

    Sturrock, P. A.; Fischbach, E.; Jenkins, J.

    2014-10-10

    We present the results of an analysis of measurements of the beta-decay rates of Ag 108, Ba 133, Eu 152, Eu 154, Kr 85, Ra 226, and Sr 90 acquired at the Physikalisch-Technische Bundesanstalt from 1990 through 1995. Although the decay rates vary over a range of 165 to 1 and the measured detector current varies over a range of 19 to 1, the detrended and normalized count rate measurements exhibit a sinusoidal annual variation with amplitude in the small range 0.068%-0.088% (mean 0.081%, standard deviation 0.0072%, a rejection of the zero-amplitude hypothesis) and phase-of-maximum in the small range 0.062-0.083 (January 23 to January 30). In comparing these results with those of other related experiments that yield different results, it may be significant that this experiment, at a standards laboratory, seems to be unique in using a 4π detector. These results are compatible with a solar influence, and do not appear to be compatible with an experimental or environmental influence. It is possible that Ba 133 measurements are also subject to a non-solar (possibly cosmic) influence.

  14. Transparente protokollierbare Kommunikation zwischen Funktionen kognitiver Systeme

    NASA Astrophysics Data System (ADS)

    Goebl, Matthias; Färber, Georg

    In kognitiven Systemen werden komplexe Entscheidungen getroffen, die ein umfassendes Umfeldverständnis erfordern. Technische Realisierungen sind meist datenintensiv und bestehen aus vielen Teilfunktionen. Um solche Systeme zu überwachen und neue Funktionen zu testen ist eine transparente und verfolgbare Kommunikation notwendig. Dieser Beitrag präsentiert einen datenzentrierten Ansatz zur Kommunikation und liefert eine Methode um alle Kommunikationsbeziehungen zu beobachten und ganzheitlich aufzuzeichnen. Ausgewählte Anwendungen demonstrieren die erzielten Ergebnisse.

  15. Cluster of the Technische Universität Dresden for greenhouse gas and water fluxes

    NASA Astrophysics Data System (ADS)

    Moderow, Uta; Eichelmann, Uwe; Grünwald, Thomas; Prasse, Heiko; Queck, Ronald; Spank, Uwe; Bernhofer, Christian

    2017-04-01

    How different land uses change CO2-fluxes under similar climatic conditions is a core question concerning the estimation of carbon sinks. Here, the TUD-cluster forms an excellent basis since it provides long-term measurements of Eddy-Covariance fluxes for different land uses. Measurements started at the Anchor Station Tharandter Wald (Spruce) in 1996. Since then the TUD-cluster has been successively complemented by continuous greenhouse gas flux observatories at Grillenburg (grassland), Klingenberg (crop rotation) and Spreewald (wetland), which have been operated since 2002, 2004 and 2010. The results of the TUD-cluster have been shared internationally in research frameworks such as EUROFLUX and subsequent research frameworks and is now part of ICOS-D (Integrated Carbon Observation System), the German branch to ICOS Europe. This contribution focuses on the presentation of the different sites with comparatively similar climatic conditions but different CO2-fluxes, water fluxes and energy fluxes. Influences of management and climatic conditions will be shown which are apparent in long-term data as well as interesting aspects of distinct land uses.

  16. Over Het Oplossen Van Technische Problemen (On Problem Solving in Technical Domain).

    ERIC Educational Resources Information Center

    Vaags, Derk Willem

    Various methods of learning employed to solve problems in mechanical engineering are presented. Results indicate that video recording and playback to students is the most effective instruction process. A comparison of analytical thinking to rote memory was made, and variables which affect learning, such as personality, are discussed. (NTIS)

  17. Review on Activities in Active Combustion Control (ACC) at the Technische Universitat Munchen (TUM)

    DTIC Science & Technology

    2001-06-01

    Helmholtz resonators. But at lower frequencies these measure often don’t lead to sufficient low amplitudes. The active methods to control the combustion...13, 1988 9. J. R. Seume, N. Vortmeyer, W. Krause, J. Hermann , C.-C. Hantschk, P. Zangl, S. Gleis, D. Vortmeyer und A. Orthmann: Transactions of the...Gleis, S.; Vortmeyer, D.: Rau, W.: AGARD CP 479, pp. 22-1 - 22-7, 1990. 29. Casentini, F., Hermann , J..; Vortmeyer, D..; Gleis, S.: Proc. of the Fourth

  18. Over Het Oplossen Van Technische Problemen (On Problem Solving in Technical Domain).

    ERIC Educational Resources Information Center

    Vaags, Derk Willem

    Various methods of learning employed to solve problems in mechanical engineering are presented. Results indicate that video recording and playback to students is the most effective instruction process. A comparison of analytical thinking to rote memory was made, and variables which affect learning, such as personality, are discussed. (NTIS)

  19. Technische Systeme für den Herzersatz und die Herzunterstützung

    NASA Astrophysics Data System (ADS)

    Schöb, Reto; Loree, Howard M.

    Herzkrankheiten verursachen allein in den Vereinigten Staaten jährlich mehr als 700’000 Todesfälle. Ungefähr 3 Millionen Patienten in den U.S.A. leiden gemäss der American Heart Association (AHA) und dem National Heart, Lung and Blood Institute (NHLBI) an kongestivem Herzversagen (Congestive Heart Failure, CHF), welches eine chronische, sehr entkräftende und degenerative Krankheit ist: Das Herz ist dabei unfähig, hinreichend Blut zu den Organen des Körpers zu pumpen. Über 400’000 Fälle von CHF werden jedes Jahr diagnostiziert. Ähnliche Zahlen werden für Europa und Japan zusammen geschätzt. Basierend auf Daten vom AHA und NHLBI beträgt die fünfjährige Überlebensrate für CHF-Patienten lediglich etwa 50% [1]. 70’000-120’000 dieser Patienten könnten von einer Herzverpflanzung profitieren. 1999 wurden in den USA aber nur 2185 Herztransplantationen durchgeführt während die Warteliste über 4000 Patienten beträgt [2]. Ein akuter Mangel an Spenderherzen und die enormen Kosten (250’000-400’000 USD pro Patient) sind die begrenzenden Faktoren für Herztransplantationen [3]. Dies bedeutet, dass eine riesige Anzahl von Patienten durch ein zuverlässiges und verschleissfreies, nichtthrombotisches, total implantierbares, künstliches Herz gerettet werden könnten. Bis heute jedoch kein derartiges Implantat kommerziell verfügbar.

  20. ["Zerquälte Ergebnisse einer Dichterseele"--literary critiques on psychiatry around 1900].

    PubMed

    Schmiedebach, Heinz-Peter

    2006-01-01

    In the last decade of the 19th century dozens of "mad" people from the respectable bourgoisie went public with most stigmatizing details of their private lives. The authors told about healthy people branded as insane, and incarcerated in insane asylums. They took their cases to the "court of public opinion". These stories became the stuff of public scandals and also the basis of an organized "lunatics' rights" movement, which was a protest movement against the power and competency of psychiatric expertise. Inspired by this movement some authors and playwriters took up the criticism towards psychiatry and wrote novels and stage plays in which they told frightening and desparate stories of restrained people who had to suffer from arbitrary decisions of psychiatrists. The paper deals with three novels and stage plays written between 1908 and 1917 by Heinrich Mann, Frederik van Eeden, and Waldemar Müller-Eberhart. It analyses the gloomy picture of the asylum and the practice and attitudes of the asylum doctors painted by the three authors. I argue that the narratives had an impact on the public as well as the professional discourse on the problem of psychiatric arbitrariness, and that the authors not only conveyed citicism but also pointed out a concept of a humaine interaction between "normal" and "abnormal" people.

  1. Zweiwegintegration durch zweisprachige Bildung? Ergebnisse aus der Staatlichen Europa-Schule Berlin

    NASA Astrophysics Data System (ADS)

    Meier, Gabriela

    2012-06-01

    While there is no simple recipe of how to respond to the multitude of languages present in many European schools, this article presents a promising alternative to monolingual education. The focus is on Staatliche Europa-Schule Berlin (SESB), a two-way immersion (TWI) model that unites children whose mother tongue is German with children whose mother tongue is another locally spoken language in one class and teaches them together in two languages. Thus in this model, offered by 17 primary schools and 13 secondary schools in Berlin, pupils learn in two languages from and with each other. Based on a largely quantitative, quasi-experimental study with 603 students, evidence is provided that there are a number of peace-linguistic benefits that can promote two-way social integration, besides fostering personal and societal multilingualism. This suggests that TWI education as practised in Berlin could serve as an educational model for other multilingual parts of Europe.

  2. Keplers Weg der Erforschung der wahren Planetenbahn. Ergebnisse aus der Durchsicht der handschriftlichen Manuskripte.

    NASA Astrophysics Data System (ADS)

    Bialas, V.

    The handwriting manuscripts with Kepler's preliminary studies for his Astronomia Nova (some 700 pages) represent the most important source material. By reconstructing his mathematical-geometrical considerations of planetary astronomy, especially his hypothesis vicaria and the introduction of an oval orbit, here modern mathematical formulas are used. A smaller part of the manuscripts deals with Kepler's - so to speak - "speculative" physics as actual cause of the planetary motion. The whole handwriting material together with a detailed commentary will be published in the next volume of the Munich Kepler Edition in 1998.

  3. Early and late outcomes of hybrid endovascular and open repair procedures in patients with peripheral arterial disease.

    PubMed

    Balaz, Peter; Rokosny, Slavomir; Wohlfahrt, Peter; Adamec, Milos; Janousek, Libor; Björck, Martin

    2013-07-01

    Hintergrund: Endovaskuläre und offene Hybridoperationen werden immer häufiger bei mehrstufiger Ischämie der unteren Extremitäten eingesetzt. Das Ziel dieser Studie ist, die Ergebnisse nach solchen OP-Verfahren in einer monozentrischen, nicht randomisierten retrospektiven Studie zu evaluieren. Patienten und Methoden: Konsekutive Patienten mit mehrstufiger arterieller Verschlusskrankheit, die in einer einzigen Sitzung mit einer Hybrid-OP behandelt wurden, wurden in Abhängigkeit vom Ausmaß der Ischämie und Art der Revaskularisation analysiert. Ergebnisse: 164 Patienten mit einer medianen Beobachtungszeit von 14 Monaten (Bereich: 1 - 70) wurden ausgewertet. OP-Indikation waren belastungsabhängige Schmerzen mit Einschränkung der Gehstrecke (Claudicationsschmerz) (Gruppe 1, 47 %), kritische Extremitätenischämie (Gruppe 2, 33 %) und akute Ischämie (Gruppe 3, 20 %). Die technische Erfolgsrate lag bei 99.3 %, die perioperative Mortalität bei 2 %. Primäre, primär-assistierte und sekundäre Raten nach einem Jahr waren 60 %, 61 % und 64 %. Primar-assistierte und sekundäre Durchblutung waren niedriger in Gruppe 2 und 3 im Vergleich zu Gruppe 1 (alle p < 0.05). Die Ergebnisse waren besser, wenn die endovaskuläre Reparatur oberhalb im Vergleich zu unterhalb der offenen Reparaturstelle durchgeführt wurde (alle p < 0.05). Extremitätenerhaltsraten nach 1 Jahr in Gruppen 1, 2 und 3 waren 98 %, 92 % und 90 %. Das Risiko einer größeren Amputation war höher in der Gruppe 3 im Vergleich zu Gruppe 1 (p = 0.001) oder der Gruppe 2 (p < 0.04). Schlussfolgerungen: Die Ergebnisse hängen von der Art der Ischämie und der Lokalisation der endovaskulären Eingriffen ab.

  4. Procedures for Computing Transonic Flows for Control of Adaptive Wind Tunnels. Ph.D. Thesis - Technische Univ., Berlin, Mar. 1986

    NASA Technical Reports Server (NTRS)

    Rebstock, Rainer

    1987-01-01

    Numerical methods are developed for control of three dimensional adaptive test sections. The physical properties of the design problem occurring in the external field computation are analyzed, and a design procedure suited for solution of the problem is worked out. To do this, the desired wall shape is determined by stepwise modification of an initial contour. The necessary changes in geometry are determined with the aid of a panel procedure, or, with incident flow near the sonic range, with a transonic small perturbation (TSP) procedure. The designed wall shape, together with the wall deflections set during the tunnel run, are the input to a newly derived one-step formula which immediately yields the adapted wall contour. This is particularly important since the classical iterative adaptation scheme is shown to converge poorly for 3D flows. Experimental results obtained in the adaptive test section with eight flexible walls are presented to demonstrate the potential of the procedure. Finally, a method is described to minimize wall interference in 3D flows by adapting only the top and bottom wind tunnel walls.

  5. Clearance flow-generated transverse forces at the rotors of thermal turbomachines. Ph.D. Thesis - Technische Univ., 1975

    NASA Technical Reports Server (NTRS)

    Urlichs, K.

    1983-01-01

    Self-excited rotor whirl represents a serious hazard in the operation of turbomachines. The reported investigation has, therefore, the objective to measure the lateral forces acting on the rotor and to determine the characteristic pressure distribution in the rotor clearance area. A description is presented of an approach for calculating the leakage flow in the case of an eccentric rotor position on the basis of empirical loss coefficients. The results are reported of an experimental investigation with a turbine stage, taking into account a variation of the clearance characteristics. The pressure data measured are consistent with the theoretical considerations.

  6. Ozeane: Ergebnisse der 7. Sitzung der Kommission für nachhaltige Entwicklung (CSD) der Vereinten Nationen

    NASA Astrophysics Data System (ADS)

    Schlimm, Jutta; Stietzel, Hans-Joachim

    1999-12-01

    The 7th session of the United Nations Commission on Sustainable Development (CSD) was organised from 19 30 April in the UN Headquarters in New York. The Commission on Sustainable Development was established in 1992 with the aim to implement the comprehensive action programme of Agenda 21. The topics on the agenda of this year’s CSD session included: oceans, tourism as well as consumption and production patterms with a special focus on the oceans item. The 7th Session covered two weeks. It began with the so-called “High Level Segment” during the first week when 89 ministers and high-ranking government representatives stated their points of view on various themes-sometimes also in interaction with the chairman. Concerning the topic of oceans CSD 7 focussed on a few main items of special priority for the implementation of the Agenda 21, both during the preparatory “Intersessional Working Group” and in the final document. These main items are: the conservation and integrated as well as sustainable management of fisheries and marine resources, including the ecosystem of the oceans, the prevention of pollution and degradation of the marine environment through land-based and other acticities, the improvement of the scientific knowledge on oceans and the interaction between the oceans and the global climate system. The decisions of CSD 7 adressed detailed and for the major part concrete proposals for action, appeals or requests to the international organisations and the interntional community with regard to these main items. Summarizing the 7th session, it can be said that in the oceans sector CSD 7 was quite successful in fullilling the task to study the implementation of Agenda 21, to set priorities and to address actors and the necessary actions.

  7. Einsatz und Wirksamkeit von Systemtherapien bei Erwachsenen mit schwerer Neurodermitis: Erste Ergebnisse des deutschen Neurodermitis-Registers TREATgermany.

    PubMed

    Schmitt, Jochen; Abraham, Susanne; Trautmann, Freya; Stephan, Victoria; Fölster-Holst, Regina; Homey, Bernhard; Bieber, Thomas; Novak, Natalija; Sticherling, Michael; Augustin, Matthias; Kleinheinz, Andreas; Elsner, Peter; Weidinger, Stephan; Werfel, Thomas

    2017-01-01

    Versorgungsregister dienen der Erfassung des Einsatzes und der Wirksamkeit von Therapien unter realen Versorgungsbedingungen und sind als Basis einer evidenzbasierten Gesundheitsversorgung unverzichtbar. Das deutsche Neurodermitis-Register TREATgermany wurde als weltweit erstes Register für Patienten mit schwerer Neurodermitis 2011 initiiert. Erwachsene mit schwerer Neurodermitis (aktuelle/frühere antientzündliche Systemtherapie und/oder objektiver SCORAD ≥ 40) werden über einen Zeitraum von 24 Monaten prospektiv beobachtet. Anhand validierter Erhebungsinstrumente werden die klinische Erkrankungsschwere (EASI, SCORAD), Lebensqualität (DLQI), Symptome, globale Erkrankungsschwere sowie die Patientenzufriedenheit erfasst und die durchgeführten Therapien dokumentiert. Die vorliegende Analyse beschreibt die Charakteristika, Therapiewahl und Wirksamkeit der eingesetzten antiinflammatorischen Systemtherapien der bis Oktober 2014 eingeschlossenen Patienten. An fünf Zentren wurden insgesamt 78 Patienten (Durchschnittsalter 39 Jahre, 61 % männlich) eingeschlossen. Bei den Patienten besteht eine hohe Inanspruchnahme ambulanter und stationärer Leistungen. Ciclosporin war das am häufigsten eingesetzte Systemtherapeutikum und zeigte die höchste klinische Effektivität (EASI-50-Ansprechrate 51 %; EASI-75-Ansprechrate 34 % nach zwölfwöchiger Therapie). Azathioprin, Methotrexat (MTX), Prednisolon oral, Mycophenolat, Alitretinoin und Leflunomid wurden ebenfalls bei einzelnen Patienten eingesetzt. Die vorliegende Registerauswertung gibt wichtige Hinweise zur derzeitigen Versorgung von Erwachsenen mit schwerer Neurodermitis in Deutschland, dokumentiert die hohe Erkrankungslast, den Nutzen vorhandener Therapien und den Bedarf an weiteren, effektiven und in der Langzeitanwendung sicheren Therapieoptionen. © 2017 Deutsche Dermatologische Gesellschaft (DDG). Published by John Wiley & Sons Ltd.

  8. Plentern mit Kiefern--Ergebnisse aus den USA [Plentering with pines--results from the United States

    Treesearch

    James M. Guldin; Don C. Bragg; Andreas Zingg

    2017-01-01

    Until now, scientifically reliable data on plentering of light-demanding tree species in Europe have been lacking. This gap is filled with long-term trials from the USA, among others with southern yellow pines. In the southern state of Arkansas, two plots of 16 hectares were installed in 1936, in the context of a large-scale trial of mixed loblolly pine (...

  9. Research on oxidation by air and tempering of Raney nickel electrocatalysts for the H2 anodes of alkali combustion materials cells. Thesis - Braunschweig Technische Univ., 1982

    NASA Technical Reports Server (NTRS)

    Selbach, H. J.

    1984-01-01

    The controlled oxidation in air of Raney nickel electrocatalysts was studied, with special attention paid to the quantitative analysis of nickel hydroxide. The content of the latter was determined through X-ray studies, thermogravimetric measurements, and spectral photometric examinations. The dependence of the content on the drying of activated catalyst is determined. The influence of nickel hydroxide on the electrochemical parameters of the catalyst, such as diffusion polarization, is studied, including a measurement of the exchange current density using the potential drop method. Conservation by oxidation in air with ancillary stabilization of the oxide in an H2 flow at 300 C is explored, including reduction by H2, the influence of tempering time, and structural studies on conserved and stabilized catalyst, long term research on the catalyst, including the influence of aging on the reduced catalyst, and the results of impedance measurements are presented.

  10. Shock tubes and waves; Proceedings of the Sixteenth International Symposium, Rheinisch-Westfaelische Technische Hochschule, Aachen, Federal Republic of Germany, July 26-31, 1987

    NASA Astrophysics Data System (ADS)

    Groenig, Hans

    Topics discussed in this volume include shock wave structure, propagation, and interaction; shocks in condensed matter, dusty gases, and multiphase media; chemical processes and related combustion and detonation phenomena; shock wave reflection, diffraction, and focusing; computational fluid dynamic code development and shock wave application; blast and detonation waves; advanced shock tube technology and measuring technique; and shock wave applications. Papers are presented on dust explosions, the dynamics of shock waves in certain dense gases, studies of condensation kinetics behind incident shock waves, the autoignition mechanism of n-butane behind a reflected shock wave, and a numerical simulation of the focusing process of reflected shock waves. Attention is also given to the equilibrium shock tube flow of real gases, blast waves generated by planar detonations, modern diagnostic methods for high-speed flows, and interaction between induced waves and electric discharge in a very high repetition rate excimer laser.

  11. Proceedings of IEEE International Conference on Nanotechnology (4th) held at the Technische Universitat Muenchen, Munich, Germany on 17-19 Aug 2004.

    DTIC Science & Technology

    2004-08-01

    Chair: D. K. Ferry) TU3_1_1 Invited talk: Coherent Transport in SWCNTs with Spin- Orbit Coupling Ahmet Ali Yanik , Prabhakar Srivastava, Gerhard...P31, TU-P18 Yang K. WE-P39 Yang S. TU3_2_5 Yang Y.-H. TU-P30 Yang Y.T. TH1_1_5 Yanik Ahmet Ali TU3_1_1 Yater J. TH1_3_4

  12. Heat tranfer 1982; Proceedings of the Seventh International Conference, Technische Universitaet Muenchen, Munich, West Germany, September 6-10, 1982. Volume 3 - General papers: Forced convection, mixed convection

    NASA Astrophysics Data System (ADS)

    Grigull, U.; Straub, J.; Hahne, E.; Stephan, K.

    The present conference on forced convection and mixed convection heat transfer covers heat transfer for a developing laminar pulsed flow of air in a tube, a finite analytic numerical solution for heat transfer and flow past a square channel cavity, heat transfer to laminar flow in non-Newtonian pseudoplastic fluids in tubes, heat transfer in a vertical rotating annulus, heat transfer at the tip of an unshrouded turbine blade, convective heat transfer in MHD channels, the turbulent diffusion of heat in recirculating liquid metal and water flows, the effects of molecular vibrational relaxation on stagnation heat transfer, and local heat transfer rates from two adjacent spheres in turbulent axisymmetric flows. Also considered are heat transfer from vibrating tubes in turbulent flow, modeling assumptions for turbulent heat transfer, calculation of heat transfer in turbulent, transpired boundary layers, heat transfer enhancement using vortex generators, modeling of mass transport in turbulent shear flows, cooling of a rotating disk by an impinging jet, profile analysis of heat/mass transfer across the plane wall jet, heat transfer coefficients of water jets impinging on a hot surface, the effect of suction on impingement heat transfer, acoustic enhancement of heat transfer in plane channels, wake interference for a heated oscillating cylinder, and mixed convection heat transfer to supercritical pressure water. (For individual items see A83-42701 to A83-42756)

  13. Die Integrative Grundschule im sozialen Brennpunkt. Ergebnisse empirischer Langsschnittuntersuchungen des Hamburger Schulversuchs (The Integrative Elementary School at the Focus of the Social Debate).

    ERIC Educational Resources Information Center

    Katzenbach, Dieter; Rauer, Wulf; Schuck, Karl Dieter; Wudtke, Hubert

    1999-01-01

    Presents results of a study of the school experiment "Integrative Elementary School" carried out in Hamburg (Germany) that aimed at keeping children with learning, language, or behavioral problems in the (regular) elementary school, which is furnished with additional teachers trained in special education. (CMK)

  14. Wie grün wünscht sich die Bevölkerung Deutschlands ihre Städte?. Ergebnisse der Naturbewusstseinsstudie 2015

    NASA Astrophysics Data System (ADS)

    Ströher, Helena; Mues, Andreas Wilhelm

    2016-06-01

    Green areas are of high importance for the population in Germany. This is demonstrated by the representative outcomes of the latest Awareness-of-Nature survey for 2015. Most interviewees do not only value urban greens as personally important but also state that they perceive them as crucial for society and environment. The article focuses especially on the perception by people from different age groups and levels of education. It highlights that the strong awareness of the population provides a good fundament for the objectives and strategies of social, environmental and nature conservation policies.

  15. Lehrkrafte und Unterricht aus Schulersicht. Ergebnisse einer Untersuchung im Fach Mathematik (Teachers and Teaching from the Students' Perspective. Results of a Study Carried Out in Math Instruction).

    ERIC Educational Resources Information Center

    Ditton, Hartmut

    2002-01-01

    Presents results of a survey among ninth graders, focusing on their perception of mathematics instruction and their mathematics teachers. Shows that their perception of teachers is related to the characteristics of the quality of instruction. Discusses including survey responses of students on school instruction in scholastic systems of quality…

  16. Results from Unit Medical Officer Health Reports during 1976 Calendar Year (Ergebnisse aus den Gesundheitsberichten der Truppenaerzte im Kalender Jahr 1976)

    DTIC Science & Technology

    1978-09-01

    personnel strergth . (1.975: 16,41,8 o/oo of actual personnel strength ; the figura was lowest in the navy with 3,314.8 o/oo of actual personnel...strength . I. infectious and parasite diseases (000-136); 32. tumors (growth’, (145-239); III . disorders of internal secretory glands, malnutrition and

  17. Qualitätsmanagement in molekularbiologischen Laboratorien

    NASA Astrophysics Data System (ADS)

    Schulze, Manuela

    Jedes Laboratorium führt Untersuchungen nach bestem Wissen und Gewissen durch, und jeder Analytiker weiß von sich, dass er/sie gute Arbeit macht. Trotzdem können Analysen des gleichen Probenmaterials in verschiedenen Laboren zu unterschiedlichen Ergebnissen führen. Sofern es sich dabei nicht um Untersuchungen im Bereich der Nachweisgrenze und damit letztlich um statistisch bedingte Unterschiede oder Inhomogenitäten im Probenmaterial handelt, trägt dies nicht zur Vertrauenswürdigkeit von analytischen Untersuchungsergebnissen bei. Mit der zunehmenden Globalisierung der Märkte rückt die gegenseitige Anerkennung von analytischen Resultaten immer stärker in den Vordergrund. Die Vergleichbarkeit von Laborresultaten wird erleichtert, wenn sich die Laboratorien auf die gleichen Richtlinien zur Vorgehensweise und Handhabung ihrer Arbeiten verständigen. Im Bereich der Laboruntersuchungen von Lebensmitteln, Futtermitteln und Saatgut ist als derartige Rischt-Schnur die EN ISO/IEC 17025 [1] anerkannt. Diese Norm enthält alle Anforderungen, die Prüflaboratorien erfüllen müssen, wenn sie nachweisen wollen, dass sie ein Qualitätsmanagementsystem betreiben, technisch (meint: fachlich) kompetent und fähig sind, fachlich fundierte Ergebnisse zu erzielen.

  18. Transitional Boundary Layers Under the Influence of High Free Stream Turbulence, Intensive Wall Cooling and High Pressure Gradients in Hot Gas Circulation. Ph.D. Thesis - Technische Hochschule, Karlsruhe, 1985

    NASA Technical Reports Server (NTRS)

    Rued, Klaus

    1987-01-01

    The requirements for fundamental experimental studies of the influence of free stream turbulence, pressure gradients and wall cooling are discussed. Under turbine-like free stream conditions, comprehensive tests of transitional boundary layers with laminar, reversing and turbulent flow increments were performed to decouple the effects of the parameters and to determine the effects during mutual interaction.

  19. Heat transfer 1982; Proceedings of the Seventh International Conference, Technische Universitaet Muenchen, Munich, West Germany, September 6-10, 1982. Volume 4 - General papers: Pool boiling, flow boiling, measuring techniques

    NASA Astrophysics Data System (ADS)

    Grigull, U.; Straub, J.; Hahne, E.; Stephan, K.

    Papers are presented on nucleate pool boiling in a microgravity environment; the influence of diameter on nucleate boiling outside tubes; burnout during flow across a small cylinder influenced by parallel cylinders; and the application of the swollen polymer technique to the study of heat transfer on film-cooled surfaces. Other topics include homogeneous nucleation in transient boiling; the heat transfer characteristics of the two-phase closed thermosyphon (wickless heat pipe); boiling heat transfer in annular flow; and the effect of rod bundle geometry (even-odd) on burnout. Attention is also given to wall temperature fluctuation of the evaporating tube at the dryout region, to the flow boiling of ethanol/cyclohexane mixtures, and to capillary flows around hemispherical bubbles. For individual items see A83-42758 to A83-42781

  20. Virtual patients in continuing medical education and residency training: a pilot project for acceptance analysis in the framework of a residency revision course in pediatrics.

    PubMed

    Lehmann, Ronny; Hanebeck, Benjamin; Oberle, Stephan; Simon, Anke; Choukair, Daniela; Tönshoff, Burkhard; Huwendiek, Sören

    2015-01-01

    Zielsetzung: Virtuelle Patienten (VPs) sind eine E-Learning-Ressource, welche klinische Entscheidungsfindung an Fallbeispielen schult. Wichtig für ihre erfolgreiche Integration ist dabei die Verbindung mit Präsenzveranstaltungen im Sinne von „Blended Learning“. Bisher gibt es kaum Untersuchungen zum Einsatz von VPs in der Fort- und Weiterbildung. In der vorliegenden Pilot-Studie wurde der Einsatz von VPs im Rahmen eines pädiatrischen Weiterbildungsrepetitoriums untersucht. Methodik: Im Rahmen des Repetitoriums der Deutschen Gesellschaft für Kinder- und Jugendmedizin 2009 in Heidelberg wurden den ca. 200 Teilnehmenden eines pädiatrisch-nephrologischen Fachvortrags zum Thema „nephrotisches und nephritisches Syndrom im Kindesalter“ zwei VPs als Nachbereitung vor Ort zur Verfügung gestellt. Anhand eines Online-Fragebogens wurden verschiedene Aspekte der Lernerfahrung mit VPs, der Verknüpfung mit dem Fachvortrag sowie der Meinung hinsichtlich des Einsatzes von VPs allgemein in der Weiterbildung evaluiert. Ergebnisse: Der Rücklauf an auswertbaren Fragebögen betrug N=40 (ca. 21%), beungünstigt durch ein technisches Problem mit der Firewall vor Ort. Die Teilnehmenden empfanden die Fallbearbeitung als lohnende Lernerfahrung mit guter Vorbereitung für die Diagnostik und Therapie bei realen Patienten/innen mit entsprechenden Beschwerden. Insbesondere wurden die Falldarstellung, die Interaktivität und die Möglichkeit der wiederholten Übung unabhängig von Zeit und Ort positiv hervorgehoben. Gefragt zum grundsätzlichen Einsatz von VPs in der Weiterbildung wurden diese als geeignete Lernmodalität bewertet und der Wunsch nach mehr solcher Angebote geäußert. Schlussfolgerung: VPs können im Bereich der ärztlichen Weiterbildung eine sinn- und wertvolle Ergänzung zu den bisherigen Angeboten bieten.

  1. Ergebnisse einer Lehrerbefragung zum Hintergrund des Englischunterrichts in der Hauptschuloberstufe (Results of a Teacher Questionnaire on the Background of Instruction in English in the Upper Grades of the Hauptschule [9-grade "terminal" school]).

    ERIC Educational Resources Information Center

    Hellwig, Karlheinz

    1980-01-01

    The questionnaire dealt with: earmarks of weaker students, parents' attitude, the teachers' training and working conditions, problems of individual instruction, time-frame, existence of professional associations, evaluation of professional conferences, and the use of media. Some evaluations are appended. (IFS/WGA)

  2. Ergebnisse einer Lehrerbefragung zum Hintergrund des Englischunterrichts in der Hauptschuloberstufe (Results of a Teacher Questionnaire on the Background of Instruction in English in the Upper Grades of the Hauptschule [9-grade "terminal" school]).

    ERIC Educational Resources Information Center

    Hellwig, Karlheinz

    1980-01-01

    The questionnaire dealt with: earmarks of weaker students, parents' attitude, the teachers' training and working conditions, problems of individual instruction, time-frame, existence of professional associations, evaluation of professional conferences, and the use of media. Some evaluations are appended. (IFS/WGA)

  3. Flexible Differenzierung im Englischunterricht. Ergebnisse einer Untersuchung an der IGS Brauschweig-West (Flexible Differentiation in Teaching English. Results of an Investigation at the Integrated "Complete School" of Braunschweig-West)

    ERIC Educational Resources Information Center

    Erdmenger, Manfred

    1974-01-01

    Gives the results of an investigation carried out at the integrated Gesamtschule (a school with grades 1-13) of Braunschweig-West, on teaching-oriented flexible external differentiation with the textbook "English for a Start" (Lensing, Dortmund). The basic principle of the model is that the pupils remain in heterogeneous groups. (Text is in…

  4. Wie konnen die Ergebnisse von vergleichenden Leistungsstudien systematisch zur Qualitatsverbesserung in Schulen genutzt werden? (How Can the Results of Large Scale Assessments Be Used Systematically for an Improvement of the Quality of Schools?).

    ERIC Educational Resources Information Center

    Terhart, Ewald

    2002-01-01

    Compares the relationship between large scale assessments and positive development of schools and instruction. Discusses strategic orientations to further quality of school systems and outlines possible starting points for the future development of individual schools. Probes the demands of a specific type of research that combines analysis and…

  5. Konventionelle Dampfkraftwerke

    NASA Astrophysics Data System (ADS)

    Zahoransky, Richard; Allelein, Hans-Josef; Bollin, Elmar; Oehler, Helmut; Schelling, Udo

    Das Dampfkraftwerk beruht als thermisches Kraftwerk auf einem thermodynamischen Kreisprozess, der Wärme in technische Arbeit umwandelt. Die Arbeit wird mittels Elektrogenerator als elektrische Energie abgegeben.

  6. Heat transfer 1982; Proceedings of the Seventh International Conference, Technische Universitaet Muenchen, Munich, West Germany, September 6-10, 1982. Volume 6 - General papers: Combined heat and mass transfer, particle heat transfer, heat exchangers, industrial heat transfer, heat transfer in energy utilization

    NASA Astrophysics Data System (ADS)

    Grigull, U.; Hahne, E.; Stephan, K.; Straub, J.

    Laboratory and operational studies of heat transfer (HT) are presented. Such topics as the irreversibility of HT and mass transfer (MT), HT in disperse systems at high temperatures, fixed-bed reactors with submerged tube bundles, HT and MT in a low-speed turbulent boundary layer with condensation, multilayer insulation blankets for spacecraft applications, HT and MT in transpiration-cooled turbine blades, and finite-element analysis of HT in a solid with radiation and ablation are discussed. Contributions are included on the design of shell-and-tube heat exchangers to avoid flow-induced vibration, HT and MT in air-conditioning cooling coils, a friction-factor correlation for the offset strip-fin matrix, convective HT in gas-turbine combustion chambers, thermal-energy storage systems, turbulent buoyant HT in enclosures containing fire sources, a phase-change dry/wet cooling system for power plants, and the effect of secondary flow on HT in solar collector tubes. For individual items see A83-43014 to A83-43024

  7. Process and Energy Optimization Assessment Level II Analysis. Rock Island Arsenal, IL

    DTIC Science & Technology

    2005-08-01

    200 °C 300 °C over 50 5.0kg 11.0kg L20 meet Technische Regeln für Gefahrstoffe [Technical Rules for Dangerous Materials] (TRGS) 554...Technical Report TRGS Technische Regeln für Gefahrstoffe [Technical Rules for Dangerous Materials] UIC University of Illinois at Chicago UPV Uniform

  8. Pumpspeicherbecken im Karstgrundwasserleiter des Weißen Jura der Schwäbischen Alb. Erste Ergebnisse aus der geologischen und hydrogeologischen Erkundung für die Planfeststellung Pumped-storage hydroelectric power plant in the Jurassic karst aquifer of the swabian alb, Germany

    NASA Astrophysics Data System (ADS)

    Neukum, Christoph; Köhler, Hans Joachim; Fernandez-Steeger, Tomas; Hennings, Sibylle; Azzam, Rafig

    2014-06-01

    Extensive geological and hydrogeological investigations have been undertaken for the planned pumped-storage hydroelectric power plant in "Blautal" (Swabian Alb, Germany) in order to characterise the Jurassic karst aquifer in which the lower reservoir will be constructed. The preferred option for the plant setup is to integrate the lower reservoir into the groundwater without sealing. Therefore, in order to reliably predict the impact of the pumped storage plant operations on the surrounding drinking water wells and groundwater dependent ecosystems, a comprehensive database has been developed to assess the hydraulic conditions of the karst aquifer. A large scale geological site investigation was carried out to characterise the rock mass and extensive hydraulic tests were performed in many boreholes. The results of the hydraulic characterisation were then implemented in a three dimensional flow model. In this paper, the first results of the geological and hydrogeological investigations are presented and discussed.

  9. Aktuelle Regelungen zur Leistungsbeurteilung und zu Zeugnissen an Deutschen Sekundarschulen. Eine Vergleichende Studie aller Bundeslander--Darstellung und Diskussion Wesentlicher Ergebnisse (Recent Regulations for the Assessment of Achievement and for Grading at German Secondary Schools. A Comparative Study among all Federal Laender--Presentation and Discussions of Important Results.

    ERIC Educational Resources Information Center

    Bohl, Thorsten

    2003-01-01

    Discusses a comparative study of regulations for assessment of achievement and grading in German secondary schools. Results reveal schools provide alternatives to traditional grading and take into account interdisciplinary or special learning achievements and social behavior. Summarizes major results. Discusses problems in the basic conception and…

  10. Die Liberalisierung de Telekommunikationsbranche in Deutschland( The Liberalization of the Telecommunication-Industry in Germany)

    DTIC Science & Technology

    2004-03-01

    Telekommunikationsdiensten sowie die Iberwachung von Lizenzvor- schriften, Universaldienst- und Kundenschutzbestimmungen, technische Regulierungsaspekte...Preselection oder Call-by-Call durchzufifhren, unterstiitzt anscheinend diesen Prozess . Eben- falls relativ hohe Anteile sind im Bereich der Auslands- und

  11. Parallel Search for a Conjunction of Shape and Contrast Polarity

    DTIC Science & Technology

    1994-01-01

    F.L. Kooi 16 maart 1994, Rapport TM 1994 B-6 TNO Technische Menskunde’, Soesterberg MANAGEMENT UITTREKSEL Een object dat zich van andere objecten...polariteit Dr.ing. J. Thieeuwes en dr. F.L. Kooi 16 maart 1994, Rapport TM 1994 B-6 TNO Technische Menskunde’, Soesterberg MANAGEMENT UITTREKSEL Een object dat...visuele sYsteem niet in staat is parallel te zoeken onder twee stimulus dimensies tegelijkertijd. Eerder onderzoek heeft laten zien dat hierop twee

  12. A Comparison of Decision Making Behaviour in a Static and a Dynamic Task Environment as a Function of Time Pressure (Een Vergelijking van Beslisgedrag in een Statische en een Dynamische Taakomgeving Als Functie van Tijdsdruk)

    DTIC Science & Technology

    1994-05-20

    Technische Menskunde’, Soesterberg MANAGEMENT UTTREKSEL Bij het onderzoek naar beslissen wordt de laatste jaren meer aandacht besteed aan de invioed van het...Technische Menskunde’, Soesterberg MANAGEMENT UI’FTREKSEL Bij het onderzoek naar beslissen wordt de Iaatste jaren meer aandacht besteed aan de invloed...feedback over de algemene toestand van het systeem . Daarori _n verwacht worden dat de uiteindelij- ke prestaties, in termen van uitkomsten, beter zijn in

  13. Towards Clean Diesel Engines. Second Symposium. Book of Abstracts.

    DTIC Science & Technology

    1998-04-06

    Louvain, B H. Barths , N. Peters Institut für Technische Mechanik RWTH, Aachen, D Diesel Combustion Study by Optical Diagnostics B. M. Vaglieco...Chemical Modeling of Pollutant Formation in DI-Diesel Engines H. Barths , N. Peters Institut für Technische Mechanik, RWTH Aachen Flamelet modeling...34, SAE Paper 952357, 1995. [2] Pitsch, H., Barths , H., P., Peters, N.: "Three- Dimensional Modeling of NOx and Soot Forma- tion in DI-Diesel

  14. Mechanisms of Combustion of Hydrocarbon/Alcohol Fuel Blends

    DTIC Science & Technology

    1990-11-01

    Combustion Science and Technology, 1990. 11) Goettgens, J, Peters, N., Seshadri, K., and Williams, F. A.: The Asymptotic Structure of Nonstoichiometric...Technische Mechanik, Rheinish-Westfalische Technische Hochschule at Aachen, West Germany, Professor C. Trevino at Depto Fluidos y Termica , Facultad de...flames. The research summarized above has been submitted for publication in Combustion Science and Technology. The coauthor of the publication is Ms

  15. Six-Hours-Rule - A Dogma for Military Surgery?

    DTIC Science & Technology

    2004-09-01

    contains color images . 14. ABSTRACT 15. SUBJECT TERMS 16. SECURITY CLASSIFICATION OF: 17. LIMITATION OF ABSTRACT UU 18. NUMBER OF PAGES 6 19a. NAME...den klinischen Verlauf und die Ergebnisse beim Polytrauma. Schweiz . Med. Wschr.1992;122:1571-1581 [6] American College of Emergency Physicians...und die Ergebnisse beim Polytrauma. Schweiz . Med. Wschr.1992;122:1571-1581 6. American College of Emergency Physicians, Clinical Policy for the

  16. On Gravity Prediction Using Density and Seismic Data

    DTIC Science & Technology

    1989-07-01

    techn. Dipl.-Ing. B . Hofmann-Wellenh6f (Technische Universitlt Graz, Austria), Univ.-Prof. Dr. H.-G. Kahle (Eidgenossische Technische Hochschule, ZUrich...for the notation and corresponding quantities): bg(x) = 2 Gp (n -x) sina [sinaln sin (+A + Cosa (VP - VA)] (3-3) sin( + B + ( 9 Y. 7P Fig. 3.1...sufficient data for the study area, one may determine regionally more appropriate values of A and B in the model Z. = A + B * H by linear regression

  17. Anforderungskatalog fur Einen Graphikfahigen Mikrocomputer fur Online-Recherchen. Report UBTUW-84-007 (Requirements for a Microcomputer with Graphic Capabilities for Online Searching).

    ERIC Educational Resources Information Center

    Stebegg, K.; Oberhauser, O.

    This paper is primarily an annotated listing of criteria for selection of a microcomputer to be used for online information retrieval. The paper was used by the University Library of the Technische Universitat Wien (Vienna, Austria) while preparing to contact computer dealers and to inform them about the library's needs in this specialized area of…

  18. "I Myself Want to Build": Women, Architectural Education and the Integration of Germany's Technical Colleges

    ERIC Educational Resources Information Center

    Stratigakos, Despina

    2007-01-01

    This article reconstructs women's entry into the architecture classrooms of Germany's "Technische Hochschulen," which were, and remain, the nation's primary institutions for training architects. Created in the 1860s and '70s to supply an industrializing nation with well-educated engineers and building officials, these elite colleges…

  19. Editorial

    NASA Astrophysics Data System (ADS)

    Schiwietz, Gregor; Klaumünzer, Siegfried; Mahnke, Heinz-Eberhard

    2007-03-01

    This NIM-B issue contains the Proceedings of the 22nd International Conference on Atomic Collisions in Solids (ICACS-22) held in the main building of the Technische Universität Berlin (Strasse des 17.Juni 135, 10623 Berlin, Germany) from the 21st until the 26th of July 2006.

  20. A Course on Reconfigurable Processors

    ERIC Educational Resources Information Center

    Shoufan, Abdulhadi; Huss, Sorin A.

    2010-01-01

    Reconfigurable computing is an established field in computer science. Teaching this field to computer science students demands special attention due to limited student experience in electronics and digital system design. This article presents a compact course on reconfigurable processors, which was offered at the Technische Universitat Darmstadt,…

  1. The Advantage of Standardisation as a Management Instrument in Companies

    DTIC Science & Technology

    2003-09-01

    R. (1975): Nummerungstechnik im Maschinenbau, Wiurzburg. Bertram, U. (1999): Prozess - und kostenorientierte Konstruktionssystematik im... technischer Harmonisierungskonzepte im europaischen Normungssystem, Frankfurt. - 138 - Eggenberger, C./Hauser, C. (1996): Conjoint Measurement zur...des Bieres, Krones AG (Hrsg.), Neutraubling. Welge, M. K./Al-Laham, A. (1992): Planung: Prozesse - Strategien - MaBnahmen, Wiesbaden. Wildemann, H

  2. Developing Correct Safety Critical, Hybrid, Embedded Systems

    DTIC Science & Technology

    2001-04-01

    Embedded Systems* Alexander Pretschner, Oscar Slotosch, Thomas Stauner Institut fuir Informatik, Technische Universitd.t Miinchen Arcisstrafe 21, 80290...case specifying this specifica- kontinuierlich-diskreter Prozesse . In Proc. of tion is depicted in Fig. 8. Note the close relationship VDI/VDE GMA

  3. Die Gasultrazentrifuge als mediale Projektion des Kalten Krieges

    NASA Astrophysics Data System (ADS)

    Helmbold, Bernd

    Studien der letzten Dekaden nach der Wiedervereinigung von BRD und DDR erweitern die Perspektive der Wissenschaftsgeschichte vom Fokus des Big Science und der technisch-militärisch-industriellen Auseinandersetzung zwischen den zwei Blöcken zu einer globalen Transformation im Konflikt der Supermächte geprägt durch lokale und auch interne Ausformungen.

  4. Managing the University/Training Hospital Interface: The Case of the Rheinisch-Westfalische Technishce Hochschule (RWTH) Aachen.

    ERIC Educational Resources Information Center

    von Bernuth, Gotz

    1991-01-01

    The Faculty of Medicine of the Rheinisch-Westfalische Technische Hochschule Aachen (Germany), founded in 1966, has been housed in one building since 1984. The faculty and university hospital are managed by three institutions: the dean (responsible for teaching and research); the clinical directorate (responsible for patient care); and the…

  5. Web-gestütztes Social Networking am Beispiel der Plattform Wissensmanagement"

    NASA Astrophysics Data System (ADS)

    Lindstaedt, Stefanie; Thurner, Claudia

    Anhand der Plattform Wissensmanagement, der größten deutschsprachigen Community im Themenfeld Wissensmanagement, werden organisationale Rahmenbedingungen, technische Werkzeuge und Rollen der Moderatorin diskutiert, die Bedingungen für den erfolgreichen Betrieb einer Community im Web 2.0 sind. Weiters wird dargestellt, wie Communities für das betriebliche Wissensmanagement eingesetzt werden können.

  6. A Course on Reconfigurable Processors

    ERIC Educational Resources Information Center

    Shoufan, Abdulhadi; Huss, Sorin A.

    2010-01-01

    Reconfigurable computing is an established field in computer science. Teaching this field to computer science students demands special attention due to limited student experience in electronics and digital system design. This article presents a compact course on reconfigurable processors, which was offered at the Technische Universitat Darmstadt,…

  7. Motivating First-Year University Students by Interdisciplinary Study Projects

    ERIC Educational Resources Information Center

    Koch, Franziska D.; Dirsch-Weigand, Andrea; Awolin, Malte; Pinkelman, Rebecca J.; Hampe, Manfred J.

    2017-01-01

    In order to increase student commitment from the beginning of students' university careers, the Technische Universität Darmstadt has introduced interdisciplinary study projects involving first-year students from the engineering, natural, social and history, economics and/or human sciences departments. The didactic concept includes sophisticated…

  8. Report on the Evaluation Results of the Course "Mechanic Undercarriage Leopard 2"

    DTIC Science & Technology

    2007-11-02

    Nederlandse Organisatie voor toegepast- natuurwetenschappelijk onderzoek TNO Management uittreksel TNO Technische Menskunde, Soesterberg onderstel titel...bijvoorbeeld door Nederlandse bedrijven voor 3.5 miljard in opleidingen gei’nvesteerd (statistisch jaarboek CBS, 1996). Een belangrijke vraag bij...werkpiek (Billet, 1994). Alhoewel er weinig "harde cijfers" beschikbaar zijn over de mate van transfer van Nederlandse bedrijfsopleidingen, wijzen

  9. CAD in der Praxis

    NASA Astrophysics Data System (ADS)

    Labisch, Susanna

    Konstruktion und Fertigung erfolgen in der Praxis fast ausschließlich rechnerunterstützt. Mit diesem Rechnereinsatz beim Konstruieren (CAD, Computer Aided Design) und Fertigen CAM (Computer Aided Manufacturing) scheint die technische Zeichnung an Bedeutung zu verlieren, da die Verständigung zwischen Konstruktions- und Fertigungsabteilung primär durch den Austausch digitaler Daten erfolgen kann.

  10. Motivating First-Year University Students by Interdisciplinary Study Projects

    ERIC Educational Resources Information Center

    Koch, Franziska D.; Dirsch-Weigand, Andrea; Awolin, Malte; Pinkelman, Rebecca J.; Hampe, Manfred J.

    2017-01-01

    In order to increase student commitment from the beginning of students' university careers, the Technische Universität Darmstadt has introduced interdisciplinary study projects involving first-year students from the engineering, natural, social and history, economics and/or human sciences departments. The didactic concept includes sophisticated…

  11. Neue Anforderungen an den Datenschutz

    NASA Astrophysics Data System (ADS)

    Dix, Alexander

    Eine von der Europäischen Kommission 2003 in Auftrag gegebene Studie hat die rasante technische Entwicklung hin zu "Ambient Intelligence Technologies“ als die größte Herausforderung für den Datenschutz bezeichnet, die sogar größer als die Herausforderung durch den internationalen Terrorismus nach dem 11. September sei.

  12. Anforderungskatalog fur Einen Graphikfahigen Mikrocomputer fur Online-Recherchen. Report UBTUW-84-007 (Requirements for a Microcomputer with Graphic Capabilities for Online Searching).

    ERIC Educational Resources Information Center

    Stebegg, K.; Oberhauser, O.

    This paper is primarily an annotated listing of criteria for selection of a microcomputer to be used for online information retrieval. The paper was used by the University Library of the Technische Universitat Wien (Vienna, Austria) while preparing to contact computer dealers and to inform them about the library's needs in this specialized area of…

  13. Educating Educators in a Volatile Climate--The Challenge of Modernising Higher Business Schools in Serbia and Montenegro

    ERIC Educational Resources Information Center

    Hollinshead, Graham

    2006-01-01

    This study is set in the rapidly changing higher educational environment that has ensued in Serbia and Montenegro in the post Milosevic era. Its primary focus is a "Training Trainers" initiative, mounted by the GTZ (Deutsche Gesellschaft fur Technische Zusammenarbeit/Society for Technical Co-operation), designed to upgrade the teaching…

  14. Empowering Indigenous Languages and Cultures: The Impact of German Bilateral Assistance in Latin America

    ERIC Educational Resources Information Center

    Cortina, Regina

    2010-01-01

    Working in Latin America for several decades to address the educational needs of poor and indigenous groups, the GTZ (Gesellschaft fur Technische Zusammenarbeit) has helped to develop the knowledge base of intercultural bilingual education. The goal of this article is to analyze Germany's impact from the mid-1970s to the present as the GTZ has…

  15. The Technical Information Library: TIB

    NASA Technical Reports Server (NTRS)

    Rosemann, Uwe

    1994-01-01

    The Technische Informationsbibliothek Hannover (TIB) is the German national central library for all areas of technology and related sciences, especially chemistry, computer science, mathematics, and physics. The TIB acquires and makes available a comprehensive collection of conventional and non-conventional literature, especially foreign material, with particular emphasis on specialized new publications which are difficult to obtain or in difficult languages.

  16. Managing the University/Training Hospital Interface: The Case of the Rheinisch-Westfalische Technishce Hochschule (RWTH) Aachen.

    ERIC Educational Resources Information Center

    von Bernuth, Gotz

    1991-01-01

    The Faculty of Medicine of the Rheinisch-Westfalische Technische Hochschule Aachen (Germany), founded in 1966, has been housed in one building since 1984. The faculty and university hospital are managed by three institutions: the dean (responsible for teaching and research); the clinical directorate (responsible for patient care); and the…

  17. Educating Educators in a Volatile Climate--The Challenge of Modernising Higher Business Schools in Serbia and Montenegro

    ERIC Educational Resources Information Center

    Hollinshead, Graham

    2006-01-01

    This study is set in the rapidly changing higher educational environment that has ensued in Serbia and Montenegro in the post Milosevic era. Its primary focus is a "Training Trainers" initiative, mounted by the GTZ (Deutsche Gesellschaft fur Technische Zusammenarbeit/Society for Technical Co-operation), designed to upgrade the teaching…

  18. Physik gestern und heute: Visualisierung mit der Schlierenmethode

    NASA Astrophysics Data System (ADS)

    Heering, Peter

    2006-07-01

    Der Name des österreichischen Forschers Ernst Mach ist heute noch mit der Schallgeschwindigkeit verbunden. Diese Auszeichnung resultiert aus Machs Untersuchungen, wie sich Projektile mit Überschallgeschwindigkeit durch die Luft bewegen. Gerade in jüngster Zeit hat die Anwendung derartiger Methoden durch technische Modifikationen wieder einen Aufschwung erfahren.

  19. Stability and variability of open-ocean deep convection in deterministic and stochastic simple models

    NASA Astrophysics Data System (ADS)

    Kuhlbrodt, Till

    2002-11-01

    other effects depend on the model parameters. This dependence is always exponential for the mean residence times, but for the probability of long nonconvecting phases it is exponential only if this probability is small. It is to be expected that wandering monostability is relevant in other parts of the climate system as well. All in all, the results demonstrate that the stability of deep convection in the Labrador Sea reacts very sensitively to the forcing. The presence of variability is crucial for understanding this sensitivity. Small changes in the forcing can already significantly lower the frequency of deep convection events, which presumably strongly affects the regional climate. ----Anmerkung: Der Autor ist Träger des durch die Physikalische Gesellschaft zu Berlin vergebenen Carl-Ramsauer-Preises 2003 für die jeweils beste Dissertation der vier Universitäten Freie Universität Berlin, Humboldt-Universität zu Berlin, Technische Universität Berlin und Universität Potsdam. Die Tiefenkonvektion ist ein wesentlicher Bestandteil der Zirkulation im Nordatlantik. Sie beeinflusst den nordwärtigen Wärmetransport der thermohalinen Zirkulation. Ein Verständnis ihrer Stabilität und Variabilität ist daher nötig, um Klimaveränderungen im Bereich des Nordatlantiks einschätzen zu können. Diese Arbeit hat zum Ziel, das konzeptionelle Verständnis der Stabilität und der Variabilität der Tiefenkonvektion zu verbessern. Beobachtungsdaten aus der Labradorsee zeigen Phasen mit und ohne Tiefenkonvektion. Ein einfaches Modell mit zwei Boxen wird an diese Daten angepasst. Das Ergebnis legt nahe, dass die Labradorsee zwei koexistierende stabile Zustände hat, einen mit regelmäßiger Tiefenkonvektion und einen ohne Tiefenkonvektion. Diese Bistabilität ergibt sich aus einer positiven Salzgehalts-Rückkopplung, deren Ursache ein Netto-Süßwassereintrag in die Deckschicht ist. Der konvektive Zustand kann schnell instabil werden, wenn der mittlere Antrieb sich hin zu w

  20. “&ldots;how the right technique emerged at the right time” Zur Geschichte der fotografischen Methode im Kalten Krieg

    NASA Astrophysics Data System (ADS)

    Fengler, Silke

    Die Frühgeschichte der fotografischen Methode, die als Nachweisinstrument kernphysikalischer und kosmischer Strahlung in den 1950er Jahren zur Blüte kam, hat das Interesse vieler Wissenschaftshistoriker gefunden. Peter Galison hat gezeigt, wie fragil das Experimentalsystem lange Zeit war, das sich um die Methode bildete, und wie prekär die mit ihr aufgezeichneten Ergebnisse.

  1. Simulationsbasierte Multisensorsystemauslegung

    NASA Astrophysics Data System (ADS)

    Denkena, B.; Möhring, H.-C.; Litwinski, K. M.

    Die vorliegende Arbeit beschreibt einen Aspekt der Entwicklung vernetzter Sensorsysteme: Die Multisensorsystemauslegung auf der Basis von FE-Simulationen. Es wird ein Konzept beschrieben, welches optimale Sensorkonfigurationen bestehend aus Sensoren verschiedener Bauart zur Überwachung verschiedenartiger Größen bestimmt. Darge-stellt sind die Ergebnisse der Anwendung an einem Element eines Werk-stückspannbaukastens.

  2. Numerische Berechnung von Wirbelstromproblemen mit der Cell-Methode

    NASA Astrophysics Data System (ADS)

    Frenner, K.; Rucker, W. M.

    2006-09-01

    In dieser Arbeit wird die Cell-Methode auf die quasistatischen Maxwellgleichungen angewendet. Dabei werden für die notwendige Transformation vom Primärgitter auf das duale Gitter reziproke Basisvektoren verwendet. Anhand der Felddiffusion der magnetischen Induktion in einen zylindrischen Leiter werden Ergebnisse der Cell-Methode mit einer analytischen Vergleichsrechnung präsentiert.

  3. Book Review: Wissenschaftliches Publizieren erlernen

    NASA Astrophysics Data System (ADS)

    Wiedemair, Christof; Sterken, Christiaan

    2012-10-01

    Book Review: Wissenschaftliches Publizieren erlernen: Wissenschaft ist wie Haute Cuisine - man muss seine Ergebnisse dem Leser stilvoll servieren. Science is like Haute Cuisine - results should be served in style to the reader. Review of "Scientific Writing for Young Astronomers", see 2011EAS....50.....S

  4. Fazit

    NASA Astrophysics Data System (ADS)

    Murrenhoff, Hubertus

    Die im Rahmen des Sonderforschungsbereiches 442 (SFB 442) erarbeiteten Ergebnisse zeigen die Leistungsfähigkeit tribologischer Systeme bei Verwendung nativer Ester in Kombination mit PVD-Werkstoffverbundschichten. Gegenstand der Untersuchungen waren die tribologischen Systeme einer Werkzeugmaschine, wie z. B. Zahnräder, Wälz- und Spindellager, Kolben einer hydraulischen Pumpe sowie Werkzeuge mit geometrisch bestimmter Schneide und Tiefziehwerkzeuge.

  5. VDI-Richtlinien - mit Technischen Regeln Wirtschaftlichkeit erhöhen und Standards setzen

    NASA Astrophysics Data System (ADS)

    Mandelartz, Johannes

    Der Verein Deutscher Ingenieure e.V. (VDI) ist ein gemeinnütziger, wirtschaftlich und politisch unabhängiger, technisch-wissenschaftlicher Verein von Ingenieuren und Naturwissenschaftlern. Mit über 137 000 persönlich zugeordneten Mitgliedern ist er eine der größten Ingenieur-Vereinigungen Europas und gilt in Deutschland als führender Sprecher der Technik und der Ingenieure. 1856 gegründet, hat er viele für die Technik wesentliche Entwicklungen in Gang gesetzt, so im Bereich der technischen Überwachung, der technischen Regelsetzung und Normung, der Arbeitsstudien, im gewerblichen Rechtsschutz und im Patentwesen. Seit seiner Gründung sieht es der VDI als seine Aufgabe, "das Zusammenwirken aller geistiger Kräfte der Technik im Bewusstsein ethischer Verantwortung zu fördern“ und die Lebensmöglichkeiten aller Menschen durch Entwicklung und sinnvoller Anwendung technischer Mittel zu verbessern.

  6. Thompson receives 1994 Bowen award

    NASA Astrophysics Data System (ADS)

    Green, David H.; Thompson, Alan Bruce

    At the Spring Meeting in Baltimore, May 23, 1994, Alan Bruce Thompson of the Eidgenossiche Technische Hochschule, Zurich, received the 1994 N. L. Bowen Award of the Volcanology, Geochemsitry, and Petrology section, which is given for a single outstanding contribution to volcanology, geochemistry, or petrology made during the preceding 5 years. The award was presented by David H. Green of the Research School of Earth Sciences. The citation and response are given here.

  7. Rahmen, Herausforderungen und Visionen für die Unternehmensorganisation

    NASA Astrophysics Data System (ADS)

    Westkämper, Engelbert; Seidel, Bernhard; Bruhn, Manfred; Bahke, Torsten; Klotz, Ulrich; Buck, Hartmut

    Die Produktion trägt entscheidend zur gesamten Wertschöpfung des Landes mit mehr als einem Drittel aller Beschäftigten bei. Die direkte Wertschöpfung ist dabei für ein rohstoff- und energiearmes Land allein durch Veredelung und technisches Know-how sowie durch die Herstellung von Produkten für den Binnen- und Weltmarkt möglich.

  8. Perspectives On C4ISTAR

    DTIC Science & Technology

    2007-11-02

    Architecture Systeem Archit tuur Technische Architectuur Operationele architectuur security management functionality d o m a i n s d o m a i n s asp ect...Increasing technical possibilities do not allow a long time of development There is always an interoperability problem CONTENTS OF THE BRIEFING > STRATEGIC...Staff Information System (ISIS), Battlefield Management System (BMS) and Artillery Fire Support Information System (AFSIS) integrated on one platform (C2

  9. Learning Effects on Strategy Selection in a Dynamic Task Environment as a Function of Time Pressure

    DTIC Science & Technology

    1994-06-01

    MANAGEMENT UI1TREKSEL Previous research on strategy selection in dynamic task environments indicated that subjects preferred to request information first...I febwari 1994 is de naam Instituut voor Zintuigfysiologie TNO gewijzigd in TNO Technische Menskunde. 2 CONTENTS Page SUMMARY 3 SAMENVAITING 4 I...waarin men gebruik maakt van de continue feedback over de toestand van het systeem . Proefpersonen moesten het veranderende conditieniveau van een atleet

  10. Characterization of single crystal chemical vapor deposition diamond detectors for neutron spectrometry.

    PubMed

    Gagnon-Moisan, F; Zimbal, A; Nolte, R; Reginatto, M; Schuhmacher, H

    2012-10-01

    Detectors made from artificial chemical vapor deposition single crystal diamond have shown great potential for fast neutron spectrometry. In this paper, we present the results of measurements made at the Physikalisch-Technische Bundesanstalt accelerator using neutron fields in the energy range from 7 MeV to 16 MeV. This study presents the first results of the characterization of the detector in this energy range.

  11. Physik gestern und heute Von der Metallstange zum Hochenergielaser

    NASA Astrophysics Data System (ADS)

    Heering, Peter

    2002-05-01

    Im Mai 1752 wurde in Marly bei Paris auf Anregung des amerikanischen Forschers und Politikers Benjamin Franklin erstmals die elektrische Natur des Blitzes nachgewiesen. Damals beschrieb Franklin auch eine technische Vorrichtung, die als Schutz von Gebäuden vor Blitzschlägen dienen sollte: den Blitzableiter. Diese aus heutiger Sicht scheinbar triviale Vorrichtung wurde aber keineswegs unmittelbar akzeptiert. Und bis heute ist die Forschung zum Schutz von Einrichtungen vor Blitzschlägen nicht abgeschlossen.

  12. [Not Available].

    PubMed

    Torge, R

    1998-12-01

    After a short introduction into the history of the building of the Physics Institute of the University of Breslau, the development under Otto Lummer is sketched: influenced by the newly founded Technische Hochschule, the building as well as the faculty, were enlarged. The collection of instruments for instruction and research was built up and the cooperation with industry and with guests from abroad strengthened. Young scientists were promoted, making Lummer's institute into one of the leading ones in optics at that time.

  13. Von Humboldt bis Einstein. Berlin als Weltzentrum der exakten Wissenschaften.

    NASA Astrophysics Data System (ADS)

    Meschkowski, H.

    Contents: 1. Die Anfänge. 2. Die Ära Dirichlet-Jacobi. 3. Der Ausbau der experimentellen Naturwissenschaften. 4. Alexander von Humboldt. 5. Berlin wird "Weltzentrum" der Mathematik. 6. Die Ära Helmholtz. 7. Neue Arbeitsweisen der Astronomie. 8. Chemie: Forschung und Industrie. 9. Max Planck. 10. Ins technische Zeitalter. 11. Zur Mathematik der zwanziger Jahre. 12. Albert Einstein. 13. Fortschritte der Grundlagenforschung. 14. Erwin Schrödinger: Physiker, Philosoph und Poet. 15. Zum Schluß.

  14. Advanced Aerodynamic Measurement Technology (Technologies avancees de mesure aerodynamique)

    DTIC Science & Technology

    1998-05-01

    wavelength laser (e.g., doubled YAG or Argon). Single laser sources can also be used to produce smaller wavelength separation (e.g., Zeeman or diode...34, Applied Optics 20, 1981, p. 610. 10 Johnston, R. and Grace, K., "Refractive Index Detector Using Zeeman Interferometry", Applied Optics, 29, 1990, p...Technische Hochschule Darmstadt (TUD), Germany Pieter H. Fuykschot, Nationaal Lucht-En Ruimtevaartlabo- ratorium (NLR), the Netherlands Steven

  15. Terahertz metrology on power, frequency, spectroscopy, and pulse parameters

    NASA Astrophysics Data System (ADS)

    Wu, Bin; Ying, Cheng Ping; Wang, Heng Fei; Zhang, Peng; Liu, Hong Yuan; Jiang, Bin

    2015-11-01

    Terahertz metrology is becoming more and more important along with the fast development of terahertz technology. This paper reviews the research works of the groups from the physikalisch-technische bundesanstalt (PTB), National institute of standards and technology (NIST), National physical laboratory (NPL), National institute of metrology (NIM) and some other research institutes. The contents mainly focus on the metrology of parameters of power, frequency, spectrum and pulse. At the end of the paper, the prospect of terahertz metrology is predicted.

  16. Mean Gravity Anomaly Prediction Techniques with a Comparative Analysis of the Accuracy and Economy of Selected Methods.

    DTIC Science & Technology

    1982-03-01

    mean gravity anomaly. To do this, it is necessary to apply a data averaging integral of the form ( Heiskanen and Moritz, 1967): -- I a b Ag f b Ag(x,y...Rapp for practical applica- tion on digital computers. Details can be found in Heiskanen and Moritz (1967), and Rapp (1964). Although least squares...methods: Institute for Physicalische Geodasie, Technische Hochschule, Darmstadt, Federal Republic of Germany. Heiskanen , W., and Moritz, H., 1967, Physical

  17. Simulation and calibration of an active neutron dosemeter.

    PubMed

    Bergmeier, F; Volnhals, M; Wielunski, M; Rühm, W

    2014-10-01

    Here the latest development stages of the HMGU active neutron dosemeter are presented. This work includes the comparison of the dosemeter's response function, calculated with Geant4, and the measurements in monoenergetic neutron fields at the Physikalisch Technische Bundesanstalt in Braunschweig, Germany. These results were used to match the response function and the count-to-dose conversion factors of the dosemeter to the Hp(10) personal dose equivalent.

  18. Payload specialist Wubbo Ockels in new sleeping restraint

    NASA Image and Video Library

    1985-10-30

    61A-08-018 (30 Oct.-6 Nov. 1985) --- Wubbo J. Ockels, a Dutch scientists representing the European Space Agency (ESA), crawls from an unique sleeping restraint in D-1 science module. Unlike the other crewmembers on STS 61A, Ockels did not sleep in the middeck of the Challenger. Ockels proposed this concept of sleeping facility and the actual hardware was developed by the Technisch Natur Wetenschappelyk Onderzoek (TNO), a Dutch government organization.

  19. Fehlertoleranzanalyse des FlexRay Startup-Prozesses

    NASA Astrophysics Data System (ADS)

    Bünte, Sven; Milbredt, Paul

    Die PlexfiRay-Prozeduren Wakeup und Startup sollen eine konsistent-synchrone Kommunikation bezüglich eines TDMA verwandten Verfuhrens herstellen. Beide Algorithmen werden in dieser Arbeit ubstrukt modelliert und mit Hilfe des Model Checkers SPIN bezüglich Terminierung analysiert. Die Ergebnisse zeigen, dass in bestimmten Fehlerszenarios die Verwendung von Central Bus Guardians, die Clusterkonfiguration und das Verhalten des Hosts darüber entscheiden, ob Fehlertoleranz und Laufzeitbeschränkungen garantiert werden können.

  20. Antikollisionssystem PRORETA - Integrierte Lösung für ein unfallvermeidendes Fahrzeug

    NASA Astrophysics Data System (ADS)

    Isermann, Rolf; Bender, Eva; Bruder, Ralph; Darms, Michael; Schorn, Matthias; Stählin, Ulrich; Winner, Hermann

    Dank einer zunehmenden Verbreitung von aktiven und passiven Sicherheitssystemen in Kraftfahrzeugen konnte die Zahl der Verkehrstoten in den letzten Jahren stetig gesenkt werden. Bei der Bearbeitung des Projekts PRORETA wurde mit der Entwicklung eines elektronischen Fahrerassistenzsystems zur Unfallvermeidung das Ziel verfolgt, durch Notbremsen und Notausweichen Unfälle zu vermeiden. Das System wurde an der TU Darmstadt in Kooperation mit der Continental AG entwickelt. Im Folgenden werden die Grundlagen des Systems, Fahrversuche und Ergebnisse einer ergonomischen Studie dargestellt.

  1. Anesthesiology residents' perspective about good teaching--a qualitative needs assessment.

    PubMed

    Ortwein, Heiderose; Blaum, Wolf E; Spies, Claudia D

    2014-01-01

    Hintergrund: In Deutschland wird es, wie in vielen Ländern, in absehbarer Zukunft einen Mangel an qualifizierten Ärzten geben. Einer der Gründe für Unzufriedenheit unter den Weiterbildungsassistenten sind die relativ unstrukturierten Weiterbildungsprogramme trotz der zunehmenden Wichtigkeit von Ergebnis-orientierter Weiterbildung. Ziel dieser Studie ist es, Charakteristika von und Anforderungen an gute Lehre während der anästhesiologischen Facharztweiterbildung aus Sicht der Weiterzubildenden zu identifizieren. Methoden: Es wurde eine Konsensus-Konferenz mit Weiterzubildenden von allen 39 anästhesiologischen Universitätskliniken Deutschlands durchgeführt. Die Teilnehmer wurden Gruppen zu einem von drei Themen zugeordnet, die anhand der nationalen Evaluation der Weiterbildung 2009 identifiziert wurden. Diese Themen waren (A) Charakteristika hilfreicher/guter Weiterbildner, (B) Charakteristika hilfreicher/guter Bedingungen und (C) Charakteristika hilfreicher/guter Curriculumsstruktur. Jede Gruppe folgte dem Nominal-Group-Technik-Konsensprozess, um Charakteristika guter Weiterbildung zu definieren und zu priorisieren. Ergebnisse: 31 (79,5%) Assistentensprecher waren anwesend. Die Ergebnisse betonen die Bedeutung strukturierter Curricula inklusive transparenter Ziele und Inhalte, formativer Zwischenprüfungen und Qualitätssicherungsmaßnahmen der Programme. Weiterbildungsassistenten wünschen sich zudem ausgebildete Weiterbildende mit formaler Lehrqualifikation und geschützte Zeit zum Lehren.Schlussfolgerung: Gute Facharztweiterbildung setzt eine sorgfältige Berücksichtigung der Bedürfnisse aller Beteiligten voraus. Die Ergebnisse bestätigen und erweitern bisherige Publikationen und können zum Teil einfach umgesetzt werden. Die Ergebnisse sind ein wichtiger Schritt hin zu einem breiteren Konsens innerhalb einer Fachdisziplin.

  2. [Is it beneficial to involve family member? A literature review to psychosocial interventions in family-centered nursing].

    PubMed

    Mahrer-Imhof, Romy; Bruylands, Michelle

    2014-10-01

    Hintergrund: Familien haben Einfluss auf die Gesundheit von chronisch erkrankten Patientinnen und Patienten und werden durch die Krankheit selbst in ihrem Wohlbefinden beeinflusst. Familienmitglieder in die Pflege einzubeziehen, wurde in verschiedenen Studien getestet. Ziel: Das Ziel dieser Literaturübersicht war, randomisiert kontrollierte Studien und Metaanalysen zu familienzentrierten Interventionen (FI) auf die Ergebniskriterien und Effektgrößen der Veränderungen zu untersuchen. Methode: Drei Metaanalysen für den Zeitraum bis 2007 und sechs randomisierte kontrollierte Studien ab 2007 zu psychosozialen familienzentrierten Interventionen wurden eingeschlossen. Ergebnisse: Die Studien zeigten, dass FI kleine bis mittlere positive Effekte auf Depression, psychische Gesundheit, Angst von Patienten und Angehörigen sowie auf die Belastung der Angehörigen hatten. Der Effekt auf physische Gesundheitsparameter konnte nicht gezeigt werden. Die Ergebnisse hingen von der untersuchten Population, den Teilnehmenden an der FI, der Art und dem Zeitraum und der Zeitdauer (Dosis) der FI ab. Die Studien zeigten große Unterschiede in der Länge und Art der Intervention, der Zielpopulation und der Auswahl der Ergebniskriterien sowohl für Patienten als auch für Angehörige. Vergleiche der Ergebnisse sind erschwert durch die Verwendung unterschiedlichster Messinstrumente. Schlussfolgerungen: Weitere Forschung mit verschiedenen Populationen, unterschiedlicher Ausprägung der FI, aber unter Verwendung der gleichen validen Messinstrumente ist anzustreben.

  3. [Family Health Nursing - a challenge for education and training? Results of an European project].

    PubMed

    Galatsch, Michael; Moser-Siegmeth, Verena; Blotenberg, Britta; Große Schlarmann, Jörg; Schnepp, Wilfried; Team des Internationalen Family Health Nursing Projektes

    2014-08-01

    Hintergrund: Seit der WHO-Studie «Family Health Nursing» (FHN) hat sich das FHN-Konzept in Europa unterschiedlich etabliert und entwickelt. Aus diesem Grund werden im internationalen Projekt «Family Health Nursing in European Communities» ein einheitliches Ausbildungskonzept für die Family Health Nurse entwickelt. Ziel: Ziel war es, die unterschiedlichen Voraussetzungen in den beteiligten Ländern darzustellen und aktuelle Problemfelder auf Länder- und EU-Ebene zu verdeutlichen. Methode: Hierzu wurden ein Review über grundlegende und länderspezifische Informationen, eine Delphi-Studie, eine Kompetenz- und Anforderungsanalyse und eine Übersicht über vorhandene Aus- und Weiterbildungskonzepte mit FHN-ExpertInnen aus den Projektländern durchgeführt. Ergebnisse: Die Ergebnisse des Reviews spiegeln auch im internationalen Kontext deutliche Unterschiede im Grad der Implementierung des FHN-Konzeptes wieder. Neben unterschiedlichen konzeptionellen Ausrichtungen haben sich mit der Zeit verschiedene Berufsbezeichnungen etabliert. Die Ergebnisse der Delphi-Studie ergaben, dass die Bezeichnung «Family Nurse» (46,3 %) bevorzugt wird, als Hauptaufgaben werden Gesundheitsförderung und Präventionsarbeit betrachtet (85,8 %). Aus diesem Grund sehen die befragten ExpertInnen den Bedarf einer spezialisierten Ausbildung auf Bachelorniveau (81,5 %). Schlussfolgerung: Das Projekt verdeutlicht das Streben der Länder nach einer hochwertigen familialen Versorgung, die durch ein einheitliches FHN-Konzept nachhaltig unterstützt werden könnte.

  4. Dry Block Calibrator with Improved Temperature Field and Integrated Fixed-Point Cells

    NASA Astrophysics Data System (ADS)

    Hohmann, Michael; Marin, Sebastian; Schalles, Marc; Fröhlich, Thomas

    2017-02-01

    To reduce uncertainty of calibrations of contact thermometers using dry block calibrators, a concept was developed at Institute for Process Measurement and Sensor Technology of Technische Universität Ilmenau. This concept uses a multi-zone heating, heat flux sensors and a multiple fixed-point cell. The paper shows the concept and its validation on the basis of a dry block calibrator with a working temperature range of 70°C to 430°C. The experimental results show a stability of ± 4 mK for the reference temperature and axial temperature differences in the normalization block less than ± 55 mK.

  5. Textilverstärkte Kunststoffbauteile in funktionsintegrierender Leichtbauweise

    NASA Astrophysics Data System (ADS)

    Kroll, Lothar

    Der Mensch ist anisotrop aufgebaut. Vor allem die tragenden Hochleistungskomponenten mit hoher Funktionsintegration, wie Knochen und Knorpel, weisen eine ausgeprägte anisotrope Eigenschaftscharakteristik auf, die an den wirkenden Kraftflusslinien ausgerichtet ist und so extrem leichte Bauweisen zulässt. Daher stellt sich die berechtigte Frage: Warum sind technische Hochleistungsstrukturen noch nicht in dieser idealen Bauweise ausgeführt? Der wesentliche Grund dafür ist, dass sich die erforderlichen beanspruchungsgerechten Werkstoffkonstruktionen und vor allem die zugehörigen Technologien erst am Anfang des Entwicklungsstadiums befinden. Die Natur hatte hier viel mehr Zeit, derartige ressourceneffiziente Werkstoffkonstruktionen zu optimieren und umzusetzen.

  6. Regelungsstrategie für zweibeiniges elastisches Laufen mittels "Virtual Model Control``

    NASA Astrophysics Data System (ADS)

    Kerscher, T.; Göller, M.; Zöllner, J. M.; Dillmann, R.

    Ziel dieses Vorhabens ist die technische Umsetzung des "elastischen Laufens“ durch die Realisierung biomechanisch motivierter Regelungsstrategien. Als dafür nötigen elastischen Antrieb wird ein künstlicher Muskel nach dem McKibben-Prinzip verwendet. Dieser Muskel zeigt trotz einiger Nachteile sehr ähnliches statisches und dynamisches Verhalten wie der biologische Muskel und hat sich daher für dieses Vorhaben als idealer Antrieb herausgestellt. Mit Hilfe des "Virtual Model Control“ wird eine Regelung für elastisches Gehen entworfen, welche direkt und indirekt die Eigenschaften der Muskeln für eine flüssige, energieeffiziente Bewegung verwendet.

  7. Digitalisierung in der Energiewirtschaft - empirische Untersuchung und Wertschöpfungskette

    NASA Astrophysics Data System (ADS)

    Dell, Timo

    Die Energiewirtschaft nutzt seit je her digitale Strukturen zur Umsetzung ihrer Prozesse. Durch den (neuen) verabschiedeten politischen Ordnungsrahmen - dem Gesetz zur Digitalisierung der Energiewende - und durch die rasante Fortentwicklung technologischer Strukturen ergeben sich jedoch die Wertschöpfungsstufen erweiternde, diversifizierende und innovative Möglichkeiten für Energieversorger (EVU) Geschäftsfelder auszubauen bzw. neue zu erschließen. Dabei ist die digitale (R)Evolution keine rein technische Umsetzung, sondern insbesondere auch eine unternehmensinterne, strategische und intern-kulturelle Herausforderung.

  8. LSWAVE 2000: Lasers and short-wavelength applications

    NASA Astrophysics Data System (ADS)

    Sandner, W.

    2001-07-01

    LSWAVE 2000 was organized as a Satellite Workshop to the Seventh International Conference on Synchrotron Radiation Instrumentation SRI 2000. It was held on Saturday, August 26, 2000, at the Technische Universität Berlin, and was jointly organized by the Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy (MBI) and the Technical University Berlin (TUB). The organizing committee consisted of Wilhelm Raith (chairman), Wolfgang Sandner, Ingolf Hertel, Manfred Wick, Bernd Winter, Tatjana Gießel, Holger Stiel, Ingo Will, Ursula Bayr (secretary) and Silvia Szlapka (secretary). Continuing information on the Workshop and its proceedings may be found under http://www.mbi-berlin.de/lswave2000/.

  9. Keller oder Dach zuerst?

    NASA Astrophysics Data System (ADS)

    Megow, Nicole

    Komplexe Planungsaufgaben entstehen in vielen Bereichen wie z. B. in der Produktion und Logistik, der Bauplanung oder allgemein im Projektmanagement. Typischerweise werden umfangreiche Projekte in viele einzelne Teilaufgaben zerlegt, die dann zeitlich geplant werden. Das heißt, es wird genau bestimmt wann bzw. in welcher Reihenfolge Aufgaben mit welchen Ressourcen durchgeführt warden sollen. Bei der Planung müssen verschiedenste Reihenfolgeabhängigkeiten zwischen den Vorgängen berücksichtigt werden. Diese Abhängigkeiten können technischer Natur sein oder werden aus sicherheitsrelevanten oder wirtschaftlichen Gründen festgelegt.

  10. Friedrich Schwab: variable stars and bugs in Transylvania

    NASA Astrophysics Data System (ADS)

    Zsoldos, Endre

    2001-10-01

    Friedrich Schwab was born in Marburg and moved to Klausenburg, Transylvania when he was 21 years old (1879). He observed variable stars there, interrupted only to participate in the German transit-of-Venus expedition to Punta Arenas in the Strait of Magellan. Returning to Transylvania he became the University mechanic in Klausenburg, and continued the observations of variables. He left his post in 1891, and possibly went back to Germany. He is last heard of in 1918, when he was working in the Technische Schule in Ilmenau.

  11. An MLP neural network for ECG noise removal based on Kalman filter.

    PubMed

    Moein, Sara

    2010-01-01

    In this paper, application of Artificial Neural Network (ANN) for electrocardiogram (ECG) signal noise removal has been investigated. First, 100 number of ECG signals are selected from Physikalisch-Technische Bundesanstalt (PTB) database and Kalman filter is applied to remove their low pass noise. Then a suitable dataset based on denoised ECG signal is configured and used to a Multilayer Perceptron (MLP) neural network to be trained. Finally, results and experiences are discussed and the effect of changing different parameters for MLP training is shown.

  12. Quantenphysik Interferometrie von C70-Molekülen

    NASA Astrophysics Data System (ADS)

    Ziegler, Thomas

    2002-05-01

    Interferenzversuche mit Neutronen und schweren Atomen stellen kein großes Problem mehr dar, selbst die Welleneigenschaften von C60-und C70-Molekülen wurden bereits nachgewiesen. Allerdings stößt man bei der Realisation immer feinerer Gitter mit Gitterkonstanten von etwa 100 nm im Fall dieser Moleküle auf technische Probleme. Wissenschaftlern der Universität Wien ist es jüngst gelungen, ein so genanntes Talbot-Lau-Interferometer zu realisieren und die Welleneigenschaften von C70 mit einer bislang unerreichten Qualität nachzuweisen [1].

  13. Update of ESA DRAMA ARES: Comparison of Envisaged Collision Alerts with Operational Statistics and Impact of Catalogue Accuracy

    NASA Astrophysics Data System (ADS)

    Dominguez-Gonzalez, Raoul; Sanchez-Ortiz, Noelia; Gelhaus, Johannes; Krag, Holger

    2013-08-01

    An upgrade of the DRAMA (Debris Risk Assessment and Mitigation Analysis) tool is currently under development by TUBS (Technische Universit¨at Braunschweig) and DEIMOS Space. The upgraded tool comprises six modules which address different aspects of debris mitigation. This paper deals with the ARES (Assessment of Risk Event Statistics) module, which provides an assessment of the annual collision risk and manoeuvre rate for a given satellite. For the upgrade of the ARES module, typical uncertainties associated with NORAD TLE and JSpOC CSM were determined. This paper briefly describes the ARES tool, describes the method used to determine the uncertainties, and shows examples of the tool applied to some missions.

  14. Sperwer After S/A TC. Military Aviation Requirements; An Approach to Address the New RNLA UAV Domain

    DTIC Science & Technology

    2003-09-02

    autoriteit LE-OPS Gebruiker JAR-FCL’s Trainer vliegers LE-145 Onderhouder LE-147 Trainer technici LE-21 WSM Subpart M Luchtwaardig heids en technische JARs LE...R o y a l N e t h e r l a n d s A r m y EURO UVS JUNE 02 6 Accountable Manager (= BLS) BLS DM als TC-Houder en onderhoudsverantwoordelijke. Tevens...tasks) OPS Authority (C-1Div) - Accountable OPS Trainings Authority (C-COKL) - Accountable Training Accountable Manager (AM) = BLS Operator VVM (Quality

  15. Data handling and evaluation for autonomous experiments in interplanetary missions

    NASA Astrophysics Data System (ADS)

    Senger, Robert

    2008-05-01

    The thesis discusses the data handling and the scientific results of the cosmic dust experiment Mars Dust Counter on the Japanese mission NOZOMI. It was defended at the Fakultät für Maschinenwesen, Lehrstuhl für Raumfahrttechnik, Technische Universität München, 85748 Garching, Germany, on July 31, 2007 under supervision of Prof. Eduard Igenbergs. The thesis is written in English and can be found at http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:91-diss-20070808-625799-1-1.

  16. Dual Species Noble Gas Nuclear Spin Polarizer for a New Search for the Atomic EDM of Xe-129 at FRM-II (Munich Research Reactor)

    NASA Astrophysics Data System (ADS)

    Cohn, Jared; Coulter, Daniel; Frisbie, Dustin; Fromm, Steven; Huneau, Jake; Rabga, Tenzin; Underwood, Walter; Singh, Jaideep; Fierlinger, Peter; Kraegeloh, Eva; Kuchler, Florian; Lins, Tobias; Marino, Mike; Meinel, Jonas; Neissen, Benjamin; Stuiber, Stefan; Fan, Isaac; Kilian, Wolfgang; Knappe-Gruenberg, Silvia; Trahms, Lutz; Chupp, Tim; Degenkolb, Skyler; Sachdeva, Natasha; Gong, Fei; Babcock, Earl; Fierlinger Group Team; Chupp Laboratory Team; Physikalisch-Technische Bundesanstalt Collaboration; Juelich CenterNeutron Science Collaboration

    2015-10-01

    Electric dipole moments are believed to be very sensitive probes of CP violation beyond the Standard Model. A new search for the atomic electric dipole moment of Xe-129 is currently underway at FRM-II in Munich. Our technique takes advantage of a state of the art magnetically shielded room, ultra-sensitive magnetometry using SQUIDs, and control of systematics using a He-3 co-magnetometer. Our goal is an order of magnitude improvement over the previous Xe-129 atomic EDM limit. We will describe the design and construction of a noble gas polarizer using spectrally-narrow diode lasers. Technische Universitaet Muenchen.

  17. Dynamic RGB-D Mapping

    DTIC Science & Technology

    2012-01-01

    depth based estimation. The Algorithm is coined RGBD -ICP and can be seen in Figure 3.4. RGBD -ICP[A,B] 1: FA ← ExtractFeatures(A) 2: FB ← ExtractFeatures...1|A f | ∑i∈A f wi‖t · bi − ai‖ 2 + (1 − α)( 1|Ad | ∑j∈Ad wj‖ηj(t · bj − aj)‖ 2 7: end while Figure 7: Algorithm: RGBD -ICP When α is set to zero, only... RGBD mapping benchmarks provided by Technische Universität München. While the bench- mark datasets provided sequences of various lengths and

  18. Spectral radiance calibrations between 165-300 nm - An interlaboratory comparison

    NASA Technical Reports Server (NTRS)

    Bridges, J. M.; Ott, W. R.; Pitz, E.; Schulz, A.; Einfeld, D.; Stuck, D.

    1977-01-01

    The spectral radiance of deuterium lamps calibrated by the Max-Planck-Institut fuer Astronomie (MPI), by the U.S. National Bureau of Standards (NBS), and by the Physikalisch-Technische Bundesanstalt (PTB) are compared to check the agreement of UV radiometric scales. The NBS group used the optically thin continuum radiation from a wall-stabilized hydrogen arc as its fundamental radiometric standard, while the MPI and PTB groups used the synchrotron radiation facility in DESY. It is found that the spectral radiance scales based upon the DESY synchrotron and the NBS hydrogen arc are consistent, at least for one wavelength relative to another.

  19. Integrating Requirements Engineering, Modeling, and Verification Technologies into Software and Systems Engineering

    DTIC Science & Technology

    2007-10-28

    the Ptolemy II CASE tool and the AutoFocus CASE tool. We realized a translation of AutoFocus models into Ptolemy -II models. This work was partly done...within the following bachelor thesis: • Stephan Fabrizek. Evaluierung und Realisierung eines Übergangs von der AutoFocus Semantik in das Ptolemy ...Übergangs von der AutoFocus Semantik in das Ptolemy -Framework. Bachelor thesis, Technische Universität München, 2005. In German. [For03] Formal Methods

  20. Einleitung

    NASA Astrophysics Data System (ADS)

    Broy, Manfred

    Seit der Erfindung programmierbarer Rechner durch Konrad Zuse vor kaum 70 Jahren haben programmierbare Informationsverarbeitungssysteme einen atemberaubenden Aufschwung genommen. Das Mooresche Gesetz mit seiner exponentiellen Steigerung der Leistungsfähigkeit der Hardware in Hinblick auf Rechen-, Speicher- und übertragungsleistung liefert dafür die technische Grundlage. Die Flexibilität programmierbarer Software ergänzt sich dazu ideal - schafft sie doch die Möglichkeiten und die Voraussetzungen dafür, dass sich diese Systeme in praktisch allen Anwendungsfeldern einsetzen lassen.

  1. Comparison of the High-Energy Photon Reference Fields of PTB and JAEA.

    PubMed

    Zutz, H; Kowatari, M; Hupe, O

    2017-07-01

    A comparison has been conducted between the 6 MeV and 7 MeV (R-F) high-energy photon reference fields of the Physikalisch-Technische Bundesanstalt (PTB) and the Japan Atomic Energy Agency (JAEA). Both fields are set up according to ISO 4037. The results of both participants are in agreement within the combined uncertainties, thus the equivalence of the measurements is demonstrated. © The Author 2016. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oup.com.

  2. Long-term comparisons between two-way satellite and geodetic time transfer systems.

    PubMed

    Plumb, John F; Larson, Kristine M

    2005-11-01

    Global Positioning System (GPS) observations recorded in the United States and Europe were used to evaluate time transfer capabilities of GETT (geodetic time transfer). Timing estimates were compared with two-way satellite time and frequency transfer (TWSTFT) systems. A comparison of calibrated links at the U.S. Naval Observatory, Washington, D.C., and Colorado Springs, CO, yielded agreement of 2.17 ns over 6 months with a standard deviation of 0.73 ns. An uncalibrated link between the National Institute of Standards and Technology (NIST) and Physikalisch-Technische Bundesanstalt, Braunschweig, Germany, has a standard deviation of 0.79 ns over the same time period.

  3. Correlation of Nonexponentiality with Dynamic Heterogeneity from Four-Point Dynamic Susceptibility X4(t) and Its Approximation XT(t)

    DTIC Science & Technology

    2010-01-01

    D. Fragiadakis,1 D. Coslovich, 2 S. Capaccioli,3 and K. L. Ngai1 1Naval Research Laboratory, Washington, DC 20375-5342, USA 2Institut fur...Theoretische Physik, Technische Universitat Wien, Wiedner Hauptstraße 8-10, A-1040 Wien, Austria 3Dipartimento di Fisica , Università di Pisa, Largo Pontecorvo 3...correlating molecules22–24 Nc = max 4t 4 max. 2 Efforts to study dynamic heterogeneities have been stymied by the difficulty of determining 4t

  4. The Caratheodory-Fejer Method for Real Rational Approximation,

    DTIC Science & Technology

    1981-10-01

    M H GUTKNECHT N01-75-C-1132 UNCLASSIFIED STAN-NA-81-15 IIEEEEEEEEEEE L11-205 ~jj 2 I’tll󈧅 H’O IIN W HR !%OM j~j 2A LEVEL 00 Ott a DTIC ChELECTEP...FEB 5 1982 ZBUTION STATrMENT A jLpproved for public releaqw, Distribution Unlimited The Carath4iodory-Fej4r method for real rational approximation Lloyd...angewandte MathematikB E’idgen6ssischc Technische Iiochschule 8092 Zurich, Switzerland Abstract. A "Carath6odory-Fej6r method" is presented ror near-best

  5. Effects of enoxaparin and dalteparin on proliferation and migration of patient-derived vascular smooth muscle cells.

    PubMed

    Ellensen, Vegard S; Abrahamsen, Iren; Lorens, James; Jonung, Torbjorn

    2014-03-01

    Hintergrund: Proliferation und Migration sind zwei der wichtigsten Prozesse der Intimahyperplasie und die primäre Ursache von intermediärem und spätem Versagen des vaskulären Graftes. Niedermolekulare Heparine inhibieren diese Prozesse an vaskulären glatten Muskelzellen in Tiermodellen, haben sich jedoch in klinischen Studien nicht bewährt. Dennoch werden sie eingesetzt, um die Intimahyperplasie nach vaskulären Interventionen zu reduzieren. Material und Methoden: Arterielle vaskuläre glatte Muskelzellen, die von Patienten mit Gefässerkrankungen gewonnen wurden, verwendeten wir um die Effekte von Enoxaparin und Dalteparin auf die Proliferation und Migration zu untersuchen und die Signaltransduktion von mitogenaktivierter Proteinkinase-extrazellulärer signalregulierter Kinase (MAPK-ERK) zu beschreiben. Die vaskulären glatten Muskelzellen wurden mit niedermolekularem Heparin in unterschiedlichen Konzentrationen behandelt und durch “image cell enumeration”, Echtzeit Migrations Monitorierung und Flowzytometrie evaluiert. Mit unfraktioniertem Heparin behandelte Serien dienten als positive Kontrolle, und unbehandelte Serien waren die negative Kontrolle. Ergebnisse: Weder Enoxaparin noch Dalteparin beeinflussten die Proliferation und MAPK-ERK-Phosphorylierung. Die Migration wurde durch beide niedermolekularen Heparine leicht reduziert. Unfraktioniertes Heparin zeigte dosisabhängige Effekte, die sich in allen Analysen von denen niedermolekularer Heparine unterschieden. Schlussfolgerungen: Unsere Studie konnte zeigen, dass niedermolekulare Heparine und unfraktioniertes Heparin Unterschiede in der Proliferation und Migration von glatten Muskelzellen bewirken. Eine mögliche Erklärung könnten die beobachteten Unterschiede in der MAPK-ERK-Aktivierung sein. Diese Ergebnisse können die negativen Ergebnisse aus klinischen Studien mit niedermolekularen Heparinen erklären, in denen die Intimahyperplasie nicht verhindert werden konnte und keine verringerte Inzidenz

  6. Grundlagenuntersuchungen

    NASA Astrophysics Data System (ADS)

    Murrenhoff, Hubertus

    Die Analyse und Optimierung der tribologischen Systeme hinsichtlich des Reibungs- und Verschleißverhaltens (Kap. 2) erfordert eine aussagekräftige Mess- und Prüftechnik. Die tribologische Prüftechnik kann nach [Czic82] in Prüfmethoden, -systeme und Analysemethoden eingeteilt werden. Die tribologische Prüftechnik kennzeichnet sich durch einen hohen technischen Stand aus, die unmittelbare Übertragbarkeit der Messergebnisse auf andere Prüfsysteme und auf reale Bauteile und Konstruktionen ist jedoch unsicher. Die Ergebnisse der Prüfungen sollten daher auf den untersuchten Verschleißfall bezogen werden.

  7. Tumor-Wachstumsmodellierung als parametrisches Bildregistrierproblem

    NASA Astrophysics Data System (ADS)

    Becker, Stefan; Jungmann, Jan Ole; Mang, Andreas; Buzug, Thorsten M.

    In der vorliegenden Arbeit stellen wir ein neues Modell zur Kopplung des Tumormasseeffektes an die, der Wachstumsmodellierung unterliegende, anisotrope Reaktionsdiffusionsgleichung vor. Die Gleichung wird auf einem hochaufgelösten Voxelgitter diskretisiert. Eine Modellierung der Anisotropie des Diffusionsprozesses ermöglicht die Integration von Diffusions-Tensor-Bildgebungsdaten. Die raumfordernde Wirkung des Tumors wird als parametrisches Bildregistrierproblem aufgefasst. Hierbei wird die resultierende Verteilung der Tumorzellkonzentration in die zu optimierende Zielfunktion integriert. Erste qualitative Ergebnisse zeigen, dass eine Minimierung der aufgestellten Zielfunktion zu einer plausiblen Modellierung des Masseeffektes führt.

  8. Registrierung im Fokus

    NASA Astrophysics Data System (ADS)

    Papenberg, Nils; Modersitzki, Jan; Fischer, Bernd

    In vielen praktischen Problemstellungen ist der Anwender nur in wenigen ausgezeichneten Bildbereichen an einer hochgenauen Registrierung interessiert. Dieser Umstand wird in der vorliegenden Arbeit konsequent umgesetzt. Es wird eine Multiresolutionsstrategie vorgestellt, die es dem Anwender erstmalig erlaubt, auf ausgewählte Bildbereiche zu fokussieren. Das Verfahren ist in einen variationellen Kontext eingebettet und bietet einen deutlichen Geschwindigkeitsvorteil gegenüber herkömmlichen Methoden. Neben der Herleitung wird die Wirkungsweise des Verfahrens beispielhaft illustriert und die Qualität der Ergebnisse diskutiert. Es zeigt sich, dass dieser neue Ansatz den problemangepassten Einsatz variationeller Methoden in zeitkritischen Anwendungen erlaubt.

  9. Reduktion von Rissartefakten durch nicht-lineare Registrierung in histologischen Schnittbildern

    NASA Astrophysics Data System (ADS)

    Schubert, Nicole; Pietrzyk, Uwe; Reißel, Martin; Palm, Christoph

    In dieser Arbeit wird ein Verfahren vorgestellt, das Rissartefakte, die in histologischen Rattenhirnschnitten vorkommen können, durch nicht-lineare Registrierung reduziert. Um die Optimierung in der Rissregion zu leiten, wird der Curvature Registrierungsansatz um eine Metrik basierend auf der Segmentierung der Bilder erweitert. Dabei erzielten Registrierungen mit der ausschließlichen Segmentierung des Risses bessere Ergebnisse als Registrierungen mit einer Segmentierung des gesamten Hirnschnitts. Insgesamt zeigt sich eine deutliche Verbesserung in der Rissregion, wobei der verbleibende reduzierte Riss auf die Glatt-heitsbedingungen des Regularisierers zurückzuführen ist.

  10. Segmentierung des Femurs aus MRT-Daten mit Shape-Based Level-Sets

    NASA Astrophysics Data System (ADS)

    Dekomien, Claudia; Busch, Martin; Teske, Wolfram; Winter, Susanne

    Inhalt dieser Arbeit ist die Segmentierung des Femurs aus MRT-Datensätzen mit einem Shape-based Level-Set-Ansatz. Der Algorithmus besteht aus zwei Phasen, der Modellerstellung und der Segmentierungsphase. In der Segmentierungsphase wurde ein kantenbasiertes und ein auf Intensitäten basierendes Optimierungskriterium mit einander kombiniert. Für eine lokale Verbesserung des Ergebnisses wurde zusätzlich ein Laplacian Level-Set-Verfahren angewendet. Der Femur konnte mit diesem Ansatz in drei verschiedenen MRT-Sequenzen und einem Fusionsdatensatz gut segmentiert werden.

  11. Patentierung und Patentlage

    NASA Astrophysics Data System (ADS)

    Herrmann, Uwe

    Gewerbliche Schutzrechte nehmen in der nationalen Rechts- und Wirtschaftsordnung sowie auch auf internationaler Ebene stetig an Bedeutung zu. Sie dienen dem Schutz geistigen Eigentums und sind für jeden Gewerbetreibenden nicht nur im Hinblick darauf von Bedeutung, eigene Rechte zu sichern, sondern auch insofern von Relevanz, dass ein Verstoß gegen Rechte Dritter zu vermeiden ist. Zu den gewerblichen Schutzrechten gehören unter anderem Kennzeichenrechte, Geschmacksmusterrechte sowie die sogenannten technischen Schutzrechte in Form des Patents sowie des Gebrauchsmusters. Die folgenden Ausführungen befassen sich ausschließlich mit den technischen Schutzrechten und geben eine kurze Einführung in die Voraussetzungen, das Entstehen und den Wegfall sowie in die Wirkungen technischer Schutzrechte. Beleuchtet wird die Situation im Wesentlichen im Hinblick auf nationale technische Schutzrechte, d. h. auf Deutsche Patente und Gebrauchsmuster sowie auf Europäische Patente, die Schutz in Deutschland entfalten. Die Möglichkeit der Erlangung von Schutzrechten im außereuropäischen Ausland wird nur am Rande gestreift.

  12. Nanomeasuring and nanopositioning engineering

    NASA Astrophysics Data System (ADS)

    Jäger, G.; Hausotte, T.; Manske, E.; Büchner, H.-J.; Mastylo, R.; Dorozhovets, N.; Hofmann, N.

    2006-11-01

    The paper describes traceable nanometrology based on a nanopositioning machine with integrated nanoprobes. The operation of a high-precision long range three-dimensional nanopositioning and nanomeasuring machine (NPM-Machine) having a resolution of 0,1 nm over the positioning and measuring range of 25 mm x 25 mm x 5 mm is explained. An Abbe offset-free design of three miniature plan mirror interferometers and applying a new concept for compensating systematic errors resulting from mechanical guide systems provide very small uncertainties of measurement. The NPM-Machine has been developed by the Institute of Process Measurement and Sensor Technology of the Technische Universitaet Ilmenau and manufactured by the SIOS Messtechnik GmbH Ilmenau. The machines are operating successfully in several German and foreign research institutes including the Physikalisch-Technische Bundesanstalt (PTB), Germany. The integration of several, optical and tactile probe systems and nanotools makes the NPM-Machine suitable for various tasks, such as large-area scanning probe microscopy, mask and wafer inspection, nanostructuring, biotechnology and genetic engineering as well as measuring mechanical precision workpieces, precision treatment and for engineering new material. Various developed probe systems have been integrated into the NPM-Machine. The measurement results of a focus sensor, metrological AFM, white light sensor, tactile stylus probe and of a 3D-micro-touch-probe are presented. Single beam-, double beam- and triple beam interferometers built in the NPM-Machine for six degrees of freedom measurements are described.

  13. [The mental health of only children and of siblings with cancer - first results of a multicenter study in Germany].

    PubMed

    Bojanowski, Sabine; Führer, Daniel; Romer, Georg; Bergelt, Corinna; von Klitzing, Kai; Brähler, Elmar; Keller, Monika; Resch, Franz; Flechtner, Hans-Henning; Lehmkuhl, Ulrike; Weschenfelder-Stachwitz, Heike

    2014-07-01

    Theoretischer Hintergrund: Kinder krebskranker Eltern wurden als Risikogruppe für die Entwicklung von psychischen Störungen identifiziert. Ergebnisse der Scheidungsforschung zeigten, dass auch Geschwisterbeziehungen bei belastenden Lebensereignissen vor psychischen Störungen schützen können. Fragestellung: Kann das Vorhandensein eines Geschwisters die Bewältigung einer elterlichen onkologischen Erkrankung unterstützen und somit auch dort als protektiver Faktor wirken? Methodik: In einer multizentrischen Studie wurden 271 Kinder untersucht. 54 % waren Inanspruchnehmer eines psychosozialen Beratungsangebotes. Einzelkinder (N = 89) und Kinder mit Geschwistern (N = 182) wurden im Hinblick auf ihre psychische Belastung (Strength and Difficulties Questionnaire, SDQ, Selbst- und Fremdurteil) miteinander verglichen. Ergebnisse: Im Gruppenvergleich zeigten sich zwischen Einzelkindern und Kindern mit Geschwistern keine signifikanten Unterschiede im Gesamturteil der Eltern. Dies galt sowohl für die Einschätzung durch den gesunden als auch durch den erkrankten Elternteil. In der Selbsteinschätzung zeigten sich bei 2 % der Einzelkinder und bei 9 % der Geschwister klinisch auffällige Werte im Gesamtproblemwert des SDQ. Der Gruppenvergleich zwischen Einzelkindern und Kindern mit Geschwistern offenbarte im Hinblick auf deren psychische Belastung keine bedeutsamen Unterschiede. Es ergaben sich Hinweise darauf, dass eine negative Beziehungsqualität (Sibling Relationship Questionnaire, SRQ) mit verstärkten Problemen in der Peer-Group assoziiert ist. Schlussfolgerungen: Das Vorhandensein eines Geschwisters ist nicht per se ein protektiver Faktor. Einzelkinder wiesen im Vergleich zu Kindern mit Geschwistern keine höhere psychische Belastung auf.

  14. [COPD und Klangtherapie: Pilotstudie zur Wirksamkeit einer Behandlung mit Körpertambura bei COPD-Patienten].

    PubMed

    Hartwig, Bernhard; Schmidt, Stefan; Hartwig, Isabella

    2016-01-01

    Hintergrund: Erkrankungen der Atemorgane treten mit steigendem Alter öfter auf, nehmen weltweit zu und sind häufige Ursachen für Morbidität und Mortalität. In dieser Pilotstudie wurde der Frage nachgegangen, ob eine einmalige 10-minütige Behandlung mit einer Körpertambura eine signifikante und effektive Verbesserung der Lungenfunktion von Patienten mit chronisch-obstruktiver Lungenerkrankung (COPD; GOLD-Stadium A oder B) erbringen kann. Patienten und Methoden: 54 Probanden konnten je zur Hälfte in eine Behandlungsgruppe (Körpertambura) und eine aktive Kontrollgruppe (Atemtherapie) randomisiert werden. Eine Bestimmung der Lungenfunktionsmessparameter «Einsekundenkapazität» (FEV1) und «inspiratorische Vitalkapazität» (IVC) zu den Zeitpunkten T1 (Baseline), T2 (direkt nach Behandlung) und als Follow-up etwa 3 Wochen nach T1 (T3). Ergebnisse: Die Behandlungsgruppe zeigte sich der Kontrollgruppe in beiden Werten signifikant überlegen. Die Zeit-×-Gruppe-Interaktion (Varianzanalyse) ergab p = 0,001 (FEV1) bzw. p = 0,04 (IVC). Die Behandlungsgruppe zeigte bei beiden Werten eine Verbesserung von klinischer Relevanz. Schlussfolgerung: Diese Ergebnisse zeigen, dass die Klangbehandlung mittels einer Körpertambura - neben den schulmedizinischen, leitliniengerechten Therapien - eine zusätzliche, nebenwirkungsarme, aber durchaus klinisch wirksame Option für die Behandlung von COPD-Patienten darstellen kann, um deren Lebensqualität zu stabilisieren und zu verbessern. © 2016 S. Karger GmbH, Freiburg.

  15. [Nursing minimum data sets (NMDS) - a literature review relating to objective and data elements].

    PubMed

    Ranegger, Renate; Ammenwerth, Elske

    2014-12-01

    Hintergrund: Um den prognostizierten Wandel im Pflegebereich begleiten zu können, wird seit langem die Forderung nach einer einheitlichen Datenbasis gestellt, auf deren Grundlage Pflegedaten von Leistungsanbietern transparent abgebildet werden können. In Österreich fehlt bis dato eine Empfehlung, welche Pflegedaten als «Basisdaten» dokumentiert werden müssen, wodurch eine nationale Vergleichbarkeit von Pflegedaten erschwert wird. Internationale Entwicklungen von Nursing Minimum Data Sets (NMDS) weisen darauf hin, dass Pflegedaten adäquat abgebildet werden können. Ziel der vorgestellten systematischen Literaturanalyse ist es, den aktuellen Wissensstand über NMDS zu erheben und eine strukturierte Beschreibung von NMDS zu entwickeln, welche vor allem die erfassten Datenelemente und die zugehörigen Zielsetzungen der NMDS-Verwendung dokumentieren kann. Ergebnisse: Insgesamt wurden 70 Publikationen zum Thema NMDS in die Literaturübersicht eingeschlossen. Die Analyse der vorgestellten acht NMDS ergab sechs zentrale Zielsetzungen und sechs übergeordnete Datenelemente. Zu den identifizierten sechs Zielsetzungen gehören: Beschreibung der Pflegepraxis, Verteilung finanzieller Mittel, Benchmarking, Personaleinsatzplanung, Trendanalysen und Qualitätssicherung. Die identifizierten sechs Datenelemente umfassen betriebliche Daten, demografische Daten, Pflegediagnosen, -interventionen, -ergebnisse (Qualitätsindikatoren) und Pflegeintensität (klinische Daten). Diskussion: Es hat sich gezeigt, dass kein klarer Zusammenhang zwischen den Zielsetzungen und Datenelementen der untersuchten minimalen Pflegedatensätzen vorliegt.

  16. Presence of exoY, exoS, exoU and exoT genes, antibiotic resistance and biofilm production among Pseudomonas aeruginosa isolates in Northwest Iran.

    PubMed

    Azimi, Somayeh; Kafil, Hossein Samadi; Baghi, Hossein Bannazadeh; Shokrian, Saeed; Najaf, Khadijeh; Asgharzadeh, Mohammad; Yousefi, Mehdi; Shahrivar, Firooz; Aghazadeh, Mohammad

    2016-01-01

    Hintergrund:Pseudomonas aeruginosa, ein Gram-negatives Stäbchenbakterium, besitzt eine wichtige Rolle als Krankheitserreger. Daher untersuchten wir Pseudomonas aeruginosa-Isolate im Nordwestiran auf das Vorkommen von exo-Genen und Biofilmbildnern. Material und Methode: 160 P. aeruginosa-Isolate wurden biochemisch identifiziert und die Antibiotikaresistenz charakterisiert. Die Fähigkeit zur Biofilmbildung wurde im Mikrotiterplatten-Assay, das Vorkommen von exo-Genen mit Allel-spezifischer PCR (Polymerase-Kettenreaktion) analysiert. Zur statistischen Analyse wurde der Chi-Quadrat-Test eingesetzt.Ergebnisse: Als effektivste Antibiotika erwiesen sich Colistin und Polymyxin B. 87% der Isolate waren Biofilmbildner, davon 69% mit massiver Biofilmbildung. In 55% der Isolate wurden exoY, in 52% exoU, in 26,3% exoS und in 5% exoT nachgewiesen. Schlussfolgerung: Die Analyse ergab eine unterschiedliche Verteilung der exo-Gene bei klinischen Isolaten von P. aeruginosa im Nordwestiran. ExoS und exoU kamen häufiger bei nicht biofilmbildenen Isolaten, exoY häufiger bei Biofilmbildnern vor. Die Ergebnisse können ein Hinweis auf die Bedeutung von exoY bei Biofilm bildenden Pseudomonas aeruginosa-Isolaten sein.

  17. Quality management of eLearning for medical education: current situation and outlook.

    PubMed

    Abrusch, Jasmin; Marienhagen, Jörg; Böckers, Anja; Gerhardt-Szép, Susanne

    2015-01-01

    Einleitung: Der Wissenschaftsrat empfahl 2008 den Universitäten innerhalb der nächsten 5 Jahre, d. h. bis spätestens 2014, ein Qualitätsmanagementsystem (QMS), das internationalen Maßstäben entspricht, zu etablieren. Ziel der vorliegenden Studie war es, zu evaluieren, ob es derzeit ein geeignetes QMS für das elektronische Lernen (eLearning) gibt, das speziell im Fach Humanmedizin deutschlandweit eingesetzt werden kann. Methoden: Im Rahmen einer Umfrage wurden mittels eines anonymisierten Fragebogens (8 Domänen, 50 Items) alle Universitäten (n=35) des Fachbereichs Medizin in Deutschland evaluiert. Ergebnisse: Die Ergebnisse (46,3% Rücklaufquote) zeigen einen nur zögerlichen Einsatz von QMS für eLearning und dass vor Ort ein großes Informationsdefizit herrscht. Schlussfolgerung: Unter Berücksichtigung der Limitationen dieser Studie kann zusammenfassend festgehalten werden, dass erheblicher Bedarf zu bestehen scheint, das existierende Informationsdefizit für QMS eLearning zu mindern, sowie zukünftig genaue Richtlinien und Standards zur Umsetzung zu definieren.

  18. [Analysis of public quality reports for home care and long-term care with respect to their usefulness for the customer].

    PubMed

    Sünderkamp, Susanne; Weiß, Christian; Rothgang, Heinz

    2014-10-01

    Hintergrund: Seit dem Pflege-Weiterentwicklungsgesetz von 2008 und der Entwicklung der Pflegetransparenzvereinbarungen sollen Verbraucher die Möglichkeit erhalten, auf Basis einer flächendeckenden Qualitätsbeurteilung von ambulanten Pflegediensten und stationären Pflegeeinrichtungen eine informierte Wahl ihres Pflegeanbieters vorzunehmen. Ziel: Diese Studie prüft die Pflegenoten auf Basis einer empirischen Analyse der veröffentlichten MDK-Qualitätsberichte von 11 884 ambulanten Pflegediensten und 10 310 Pflegeheimen, was einer erstmaligen Vollerhebung aller bundesdeutschen Pflegeanbieter gleichkommt. Methoden: Auswertungen der deskriptiven Statistik und Diskussion der Ergebnisse in Hinblick auf die Nützlichkeit der Noten für den Verbraucher. Ergebnisse: Die Auswertungen zeigen eine begrenzte Aussagekraft der Pflegenoten für den Verbraucher. Ursächlich dafür sind insbesondere die durchschnittlich sehr guten Noten bei geringer Streuung und die großen Lücken in der Bewertung der einzelnen Kriterien, vor allem im ambulanten Bereich. Sie verstärken den Einfluss pflegeferner Kriterien auf die Gesamtnote und begünstigen den Ausgleich von Pflegemängeln durch guten Service. Dies kommt aber sehr selten vor. Eine stärkere Bewertung von Risikokriterien würde die Aussagekraft derzeit kaum erhöhen. Schlussfolgerungen: Die Konzeption der Pflegenoten bedarf einer gründlichen Optimierung, um die Nützlichkeit für den Verbraucher zu erhöhen.

  19. Infection control: Knowledge and compliance among Saudi undergraduate dental students.

    PubMed

    Al-Maweri, Sadeq Ali; Tarakji, Bassel; Shugaa-Addin, Bassam; Al-Shamiri, Hashem M; Alaizari, Nader Ahmed; AlMasri, Ousamah

    2015-01-01

    Zielsetzung: In der Studie sollten die Kenntnisse, die Einstellung und die praktische Umsetzung infektionspräventiver Maßnahmen bei Studenten der Zahnmedizin analysiert werden.Methode: In einer Querschnittsstudie wurde ein selbst zu beantwortender Fragebogen zur Erfassung des Impfstatus, der Kenntnisse und der Einstellung zur Infektionsprävention an 600 Studenten im 4., 5. und 6. Ausbildungsjahr des Al-Farabi College für Dentistry und Nursing, Riyadh, Saudi Arabia, verschickt. Die Daten wurden mittels SPSS analysiert. Das Signifikanzniveau wurde mit p<0,05 festgelegt.Ergebnisse: Die Responserate betrug 85% (512 von 600). Während die Mehrzahl der Studenten (90%) gegen Hepatitis B geimpft war, war nur bei 37,4% anti-HBs bestimmt worden. 98,8% bzw. 90,8% trugen stets Schutzhandschuhe bzw. Mund-Nasen-Schutz bei der zahnärztlichen Behandlung, während das Tragen einer Schutzbrille nur in 29,2% angegeben wurde. Ein signifikant höherer Anteil der Studenten zeigte im 6. Ausbildungsjahr eine positive Einstellung zur Behandlung von Patienten mit Infektionskrankheiten im Vergleich zum 4. und 5. Ausbildungsjahr. Etwa ein Drittel der Studenten gab an, dass sich ein oder mehrere arbeitsbedingte Verletzungen bei der Patientenbehandlung ereignet hatten.Schlussfolgerung: Obwohl die Studenten ein solides Wissen und eine gute Einstellung zur Infektionsprävention hatten, war die Compliance zur praktischen Umsetzung gering. Die Ergebnisse unterstreichen die Notwendigkeit der kontinuierlichen Erziehung Saudischer Zahnmedizinstudenten zur Infektionsprävention.

  20. "Peer-assisted learning" (PAL) in the Skills-Lab--an inventory at the medical faculties of the Federal Republic of Germany.

    PubMed

    Blohm, M; Lauter, J; Branchereau, S; Krautter, M; Köhl-Hackert, N; Jünger, J; Herzog, W; Nikendei, C

    2015-01-01

    Hintergrund: Das didaktische Konzept des „Peer-assisted learning“ (PAL) hat sich seit vielen Jahren in der medizinischen Ausbildung als wertvoll erwiesen. Insbesondere im Bereich der inzwischen weit verbreiteten Skills-Labs ist der Einsatz studentischer Tutoren gleichermaßen beliebt wie effektiv. Ziel des vorliegenden Artikels ist, auf Basis einer bundesweiten Befragung den aktuellen Stand über Verbreitung, Umfang und inhaltliche wie strukturelle Ausgestaltung der PAL-Programme in den Skills-Labs der deutschen Medizinischen Fakultäten zu erfassen.Methoden: Sämtliche 36 bundesdeutsche Medizinische Fakultäten wurden kontaktiert und um Teilnahme an der 16 Leitfragen umfassenden Befragung zur Struktur von bestehenden PAL-Programmen im Skills-Lab-Bereich auf telefonischem oder schriftlichem Wege gebeten. Die erhaltenen Daten wurden quantitativ und qualitativ ausgewertet.Ergebnisse: 35 von 36 (97,2%) medizinischen Fakultäten nahmen an der Befragung teil. Ein PAL-Programm existiert an 33 (91,7%) Standorten. Die Ergebnisse zeigen, dass hinsichtlich Umfang und Inhalten jedoch große Unterschiede zwischen den Fakultäten bestehen. Schlussfolgerungen: PAL ist an bundesdeutschen medizinischen Skills-Labs nahezu flächendeckend umgesetzt. Weitere Untersuchungen zur Konzeption und Standardisierung von Schulungskonzepten scheinen zentral für die Weiterentwicklung von PAL im Skills-Lab.

  1. Student evaluation of problem-based learning in a dental orthodontic curriculum--a pilot study.

    PubMed

    Ratzmann, Anja; Wiesmann, U; Proff, P; Kordaß, Bernd; Gedrange, T

    2013-01-01

    Ziel: In der vorliegenden Fragebogenstudie wurde die studentische Rezeption des problemorientierten Lernens (POL) im Curriculum der Kieferorthopädie hinsichtlich Akzeptanz, Sinn/Motivation, Wissen/Verstehen und tutorieller Unterstützung) untersucht. Methode: Es erfolgte eine Gegenüberstellung zweier verschiedener didaktischer Methoden (POL, Kurzreferate) bei der Durchführung des kieferorthopädischen Diagnostikkurses in einem randomisierten Zwei-Gruppen-Plan über zwei Semester, in dem die Reihenfolge der Methoden variiert wurde. Ergebnisse: Es konnten keine Unterschiede zwischen den Gruppen bezüglich ihrer Einschätzungen und Prüfungsleistungen gefunden werden. Es zeigt sich, dass die Akzeptanz des POL hauptsächlich mit der individuellen Motivation zum POL zusammenhängt. Je höher die Motivation, desto positiver die Einstellung. Die Studierenden können mit der Methode effektiver und konstruktiver arbeiten, wenn sie selbst motiviert sind bzw. für sich einen Sinn in POL erkennen. Schlussfolgerung: Unter Berücksichtigung des Literaturstudiums und der vorliegenden Ergebnisse ist das POL grundsätzlich als Lehrmethode in die zahnmedizinische Ausbildung integrierbar. Die Motivation der Studierenden stellt einen entscheidenden Faktor für den Lernerfolg dar.

  2. Mimiviridae, Marseilleviridae, and virophages as emerging human pathogens causing healthcare-associated infections.

    PubMed

    Kutikhin, Anton G; Yuzhalin, Arseniy E; Brusina, Elena B

    2014-01-01

    Zielsetzung: Im letzten Jahrzehnt wurde vermutet, dass Viren der Familie der Mimiviridae und der Marseilleviridae (sog. Megavirales) Pneumonien verursachen können. Deshalb wurde eine Literaturrecherche zu den möglichen Zusammenhängen von Mimiviridae, Marseilleviridae, Virophagen und Pneumonien mit den Schwerpunkten HA-Infektionen und andere Infektionen der Atemwege durchgeführt. Ergebnisse und Diskussion: Die Analyse ergab, dass Viren aus der Familie der Mimiviridae potentielle Verursacher sowohl der CA- als auch der HA-Pneumonie sein können. Diese Viren können zu einem verschlechterten Outcome bei Intensivtherapiepatienten führen. Der genaue Mechanismus ihrer Pathogenität ist jedoch noch immer nicht geklärt. Die unterschiedlichen Ergebnisse zwischen serologischen und Genommethoden sind wahrscheinlich durch den hohen Polymorphismus der Nucleotidsequenzen der Vertreter der Mimiviridae zu erklären. Daher sind weitere Untersuchungen zur Pathogenität der Mimiviridae und ihrer Rolle bei der Pneumonieentstehung in Risikogruppen notwendig.Im Unterschied dazu ist die Pathogenität der Viren der Familie der Marseilleviridae und der Gruppe der Virophagen noch unklar.

  3. Modellbasierte Segmentierung von differenzierten Lymphknoten in CT-Daten

    NASA Astrophysics Data System (ADS)

    Dornheim, Lars; Dornheim, Jana

    Für die computerbasierte Diagnoseunterstützung bei Tumorerkrankungen ist Wissen über Lage, Ausdehnung und Art der Lymphknoten für die TNM-Klassifikation nötig. Für die computergestütze Planung nachfolgender Eingriffe wie der Hals-Lymphknoten-Ausräumung, ist dieses Wissen ebenfalls von Bedeutung. Deshalb ist ein effizientes und exaktes Segmentierungsverfahren für Lymphknoten in CT-Datensätzen erforderlich, das besonders auch mit pathologisch veränderten Lymphknoten zurechtkommt. Basierend auf früheren Arbeiten präsentieren wir in dieser Arbeit ein deutlich weiterentwickeltes, modellbasiertes Segmentierungsverfahren für Lymphknoten in CT-Datensätzen, mit dem nun besonders auch vergrößerte sowie nekrotische Lymphknoten adressiert werden. Unser Verfahren wurde an 21 Lymphknoten aus 5 CT-Datensätzen getestet, darunter mehrere vergrößerte und nekrotische. Die Ergebnisse liegen im Bereich der Inter-Personen-Varianz und verbessern die Ergebnisse früherer Arbeiten noch einmal spürbar.

  4. Retrospective analysis of a VACM (vacuum-assisted closure and mesh-mediated fascial traction) treatment manual for temporary abdominal wall closure - results of 58 consecutive patients.

    PubMed

    Beltzer, Christian; Eisenächer, Alexander; Badendieck, Steffen; Doll, Dietrich; Küper, Markus; Lenz, Stefan; Krapohl, Björn Dirk

    2016-01-01

    Einleitung: Das optimale Behandlungskonzept eines temporären Bauchdeckenverschlusses (temporary abdominal closure, TAC) bei kritisch kranken viszeralchirurgischen Patienten mit offenem Abdomen („open abdomen“, OA) ist weiterhin unklar. Durch eine VACM-Therapie (vacuum-assisted closure and mesh-mediated fascial traction) scheinen sich gegenüber anderen Verfahren des TAC höhere Faszienverschlussraten (delayed primary fascial closure rate, FCR) realisieren zu lassen. Material und Methoden: Patienten unserer Klinik (n=58), welche in den Jahren 2005 bis 2008 mittels eines VAC/VACM-Behandlungsmanuals behandelt wurden, wurden retrospektiv analysiert. Ergebnisse: Die FCR aller Patienten betrug insgesamt 48,3% (95%-Konfidenzintervall: 34,95–61,78). Bei Patienten, bei denen im Verlauf ein Vicryl-Netz auf Faszienebene implantiert wurde (VACM-Therapie), konnte eine FCR von 61,3% realisiert werden. Die Letalität der mittels VACM therapierten Patienten betrug 45,2% (95%-KI: 27,32–63,97).Schlussfolgerung: Die Ergebnisse der eigenen Untersuchung bestätigen bisherige Studienergebnisse, die eine akzeptable FCR bei non-trauma-Patienten durch Anwendung der VACM-Therapie zeigen konnten. Die VACM-Therapie scheint aktuell Therapiekonzept der ersten Wahl bei Patienten mit OA und Indikation zum TAC zu sein.

  5. [Prevalence and intensity of nightmares in traumatized versus non-traumatized children and adolescents].

    PubMed

    Ossa, Fanny Carina; Bering, Robert; Pietrowsky, Reinhard

    2013-09-01

    Fragestellung: Alpträume können bei Kindern, wie auch bei Erwachsenen, als Symptom für eine Traumatisierung gelten. Daher ist zu vermuten, dass bei traumatisierten Kindern und Jugendlichen die Alptraumbelastung höher ist als bei nicht traumatisierten Kindern und Jugendlichen. Methodik: Insgesamt nahmen 38 traumatisierte und 40 nicht traumatisierte Kinder und Jugendliche an der Untersuchung teil. Anhand eines Fragebogens wurde die Alptraumbelastung (u. a. die Alptraumhäufigkeit und die empfundene Intensität) erfasst. Ergebnisse: Die Ergebnisse zeigen, dass traumatisierte Kinder und Jugendliche signifikant mehr Alpträume berichten (9.7 Alpträume pro Monat) und diese als intensiver und furchtauslösender bewerten als die Teilnehmer der Kontrollgruppe (1.7 Alpträume pro Monat). Die Anzahl der Alpträume bei traumatisierten Mädchen ist im Vergleich zu der Anzahl der Alpträume bei traumatisierten Jungen doppelt so hoch. Zudem geben traumatisierte Kinder und Jugendliche signifikant häufiger an, Angst vor einer Traumwiederholung zu haben, sich während des Alptraums hilflos und sich am Tag durch den Traum nachhaltig beeinträchtigt zu fühlen. Schlussfolgerung: Patienten mit einer Traumatisierung erleben in ihren Träumen mehr Gewalt und Lebensbedrohung. Eine erhöhte Alptraumbelastung ist damit auch bei Kindern und Jugendlichen ein Merkmal einer vorausgegangenen Traumatisierung.

  6. Use of elaborate feedback and an audience-response-system in dental education.

    PubMed

    Rahman, Alexander; Jacker-Guhr, Silke; Staufenbiel, Ingmar; Meyer, Karen; Zupanic, Michaela; Hahnemann, Merle; Lührs, Anne-Katrin; Eberhard, Jörg

    2013-01-01

    Einleitung: Die Studie soll die Frage klären, ob sich durch Anwendung von elaboriertem Feedback und einem Audience-Response-Systems (ARS) der Lernerfolg im Studienfach Zahnerhaltung signifikant verbessert. Methodik: Die Studierenden des 1. klinischen Semesters wurden in eine Studien- und eine Kontrollgruppe randomisiert eingeteilt. Die Randomisierung erfolgte unter Berücksichtigung der Faktoren Alter, Geschlecht und Note im Physikum. Im Verlauf von 10 Vorlesungen wurden pro Vorlesung 5 Multiple-Choice-Fragen zu den formulierten Lernzielen gestellt. Diese wurden unter Anwendung eines ARS von den Studierenden beantwortet. Nur die Studiengruppe erhielt sofort ein elaboriertes Feedback zu den Ergebnissen. Die am Ende durchgeführte Abschlussklausur und Evaluation sollten ermitteln, ob das elaborierte Feedback zu einem Lernerfolg führt und welchen Effekt das ARS auf die Vorlesungsatmosphäre hat. Ergebnisse: Die Ergebnisse der Abschlussklausuren ergaben keinen signifikanten Unterschied zwischen dem Lernerfolg der Studien- und der Kontrollgruppe. Schlussfolgerung: Durch das elaborierte Feedback zeigte sich in dieser Untersuchung kein Unterschied im Lernerfolg. Mit dem ARS ließ sich jedoch eine interaktivere, positivere Lernatmosphäre schaffen.

  7. High-frame rate imaging of two-phase flow in a thin rectangular channel using fast neutrons.

    PubMed

    Zboray, R; Mor, I; Dangendorf, V; Stark, M; Tittelmeier, K; Cortesi, M; Adams, R

    2014-08-01

    We have demonstrated the feasibility of performing high-frame-rate, fast neutron radiography of air-water two-phase flows in a thin channel with rectangular cross section. The experiments have been carried out at the accelerator facility of the Physikalisch-Technische Bundesanstalt. A polychromatic, high-intensity fast neutron beam with average energy of 6 MeV was produced by 11.5 MeV deuterons hitting a thick Be target. Image sequences down to 10 ms exposure times were obtained using a fast-neutron imaging detector developed in the context of fast-neutron resonance imaging. Different two-phase flow regimes such as bubbly slug and churn flows have been examined. Two phase flow parameters like the volumetric gas fraction, bubble size and mean bubble velocities have been measured. The first results are promising, improvements for future experiments are also discussed. Copyright © 2014 Elsevier Ltd. All rights reserved.

  8. Jahre Entwicklung der Instandhaltung - von der ausfallorientierten Instandhaltung zum gemeinsamen TPM und RCM

    NASA Astrophysics Data System (ADS)

    Iske, Friedhelm

    Zur Einleitung meines Beitrages möchte ich von einem Gespräch mit einem Mitarbeiter berichten, das ich als junger Vorgesetzter einer Instandhaltungsgruppe 1988 führte. Der engagierte Mitarbeiter feierte damals sein vierzigjähriges Dienstjubiläum und war stolz auf das von ihm Geleistete sowie auf den besonderen Einsatz seiner Altersgruppe, die nach dem Zweiten Weltkrieg das Werk wieder aufgebaut hatte. Auf meine Frage, was denn damals die erste Aufgabe in der Firma war, bekam ich kurz und knapp und mit einer Selbstverständlichkeit die selbstbewusste Antwort: "Unser Pferd füttern und mit dem Pferd die innerbetrieblichen Transporte erledigen“. Als junger, technisch orientierter Vorgesetzter war ich über diese Antwort sehr überrascht. Gedanklich weit entfernt war die Vorstellung, dass in der Vergangenheit Transporte mit einem Pferd erledigt wurden.

  9. PTB’s enhanced stitching approach for the high-accuracy interferometric form error characterization of spheres

    NASA Astrophysics Data System (ADS)

    Bartl, Guido; Krystek, Michael; Nicolaus, Arnold

    2014-06-01

    The stitching procedure that was presented a few years ago allowed the reconstruction of the real shape of a sphere from the measured data that had been acquired by the sphere interferometer of the Physikalisch-Technische Bundesanstalt. The enhancements described in this paper involve additional information from the measurements that could not be taken into account before. Therefore, not only the determination of the uncertainty of the reconstructed results is enabled, but also the occurrence of large-scale systematic deviations can be prevented. As a consequence, the form deviations of a sphere can be characterized reliably, which benefits the efforts of reducing the form deviations of the silicon spheres of the Avogadro project. In other fields where spheres are used as references, accurate knowledge of the real form may be helpful for further improvements.

  10. Molar-mass measurement of a 28Si-enriched silicon crystal for determination of the Avogadro constant

    NASA Astrophysics Data System (ADS)

    Narukawa, Tomohiro; Hioki, Akiharu; Kuramoto, Naoki; Fujii, Kenichi

    2014-06-01

    The molar mass of a 28Si-enriched crystal was measured at the National Metrology Institute of Japan to determine the Avogadro constant by the x-ray crystal density method as part of the International Avogadro Coordination project. The molar mass was determined by isotope ratio measurements using a multicollector inductively coupled plasma mass spectrometer combined with an isotope dilution technique. The 28Si-enriched crystal was dissolved in tetramethylammonium hydroxide and three different blended solutions were used to correct for mass bias in the measurement. The molar mass of the 28Si-enriched crystal was determined to be 27.976 970 09 g mol-1 with a standard uncertainty of 0.000 000 14 g mol-1. This corresponds to a relative standard uncertainty of 5.2 × 10-9. This result is consistent with measurements reported by the Physikalisch-Technische Bundesanstalt, Germany.

  11. PREFACE: 15th International Conference on the Strength of Materials (ICSMA-15)

    NASA Astrophysics Data System (ADS)

    Skrotzki, Werner; Oertel, Carl-Georg; Biermann, Horst; Heilmaier, Martin

    2010-04-01

    . This is a very good ratio showing that we could attract the young generation. There have been 272 oral and 135 poster presentations. It is our pleasure to thank the members of the International ICSMA Committee for their valuable help, especially for proposing and choosing the 18 plenary speakers. 187 papers were submitted for publication in the proceedings, 167 were accepted after reviewing. We would like to express our thanks to all referees for their efficient and prompt efforts. We acknowledge particularly support from the German Research Society (DFG), the Saxon Ministry for Science and Art and the City of Dresden. We are also grateful for industrial support from PLANSEE Metall GmbH, Goodfellow GmbH, MTS Systems GMB, Nagoya University and IOP Publishing. Finally we thank all members of the Local Organizing Committee, Intercom Dresden and Conwerk / Laboratory Ten for the excellent organization of ICSMA 15 and the very pleasant collaboration. During the conference the International ICSMA Committee decided to convene the next conference in Bangalore, India, in 2012. We wish the organizers of ICSMA 16 great success and look forward to meeting you in Bangalore. Werner Skrotzki (Technische Universität Dresden) Carl-Georg Oertel (Technische Universität Dresden) Horst Biermann (Bergakademie Technische Universität Freiberg) Martin Heilmaier (Technische Universität Darmstadt) Guest Editors Dresden, June 23, 2009 (* Corresponding author; e-mail address: werner.skrotzki@physik.tu-dresden.de)

  12. Stereo particle image velocimetry set up for measurements in the wake of scaled wind turbines

    NASA Astrophysics Data System (ADS)

    Campanardi, Gabriele; Grassi, Donato; Zanotti, Alex; Nanos, Emmanouil M.; Campagnolo, Filippo; Croce, Alessandro; Bottasso, Carlo L.

    2017-08-01

    Stereo particle image velocimetry measurements were carried out in the boundary layer test section of Politecnico di Milano large wind tunnel to survey the wake of a scaled wind turbine model designed and developed by Technische Universität München. The stereo PIV instrumentation was set up to survey the three velocity components on cross-flow planes at different longitudinal locations. The area of investigation covered the entire extent of the wind turbines wake that was scanned by the use of two separate traversing systems for both the laser and the cameras. Such instrumentation set up enabled to gain rapidly high quality results suitable to characterise the behaviour of the flow field in the wake of the scaled wind turbine. This would be very useful for the evaluation of the performance of wind farm control methodologies based on wake redirection and for the validation of CFD tools.

  13. Ein mobiler und offener Kernspintomograph: Kernspintomographie für Medizin und Materialforschung

    NASA Astrophysics Data System (ADS)

    Blümich, Bernhard; Kölker, Christian; Casanova, Federico; Perlo, Juan; Felder, Jörg

    2005-09-01

    An der RWTH Aachen wurde der erste offene und mobile Kernspintomograph entwickelt. Anders als die normalerweise riesigen und unbeweglichen Geräte besitzt er keine enge Magnetröhre. So kann er auch in große Untersuchungsobjekte hinein schauen, ohne dass diese zerstört werden müssen. Wie eine Lupe erfasst er dabei ein begrenztes Volumen um den Aufsatzpunkt herum. Neben der Medizin ermöglicht der offene Tomograph viele neue Anwendungsgebiete, vor allem in der Materialprüfung und Qualitätskontrolle. Der Aachener Prototyp kann auch das Fließprofil und die Geschwindigkeitsverteilung strömender Flüssigkeiten sichtbar machen. Sein offenes Prinzip erforderte neue technische Komponenten und modifizierte bildgebende Verfahren. Die Messzeit pro Bild kann heute schon unter einer Viertelstunde liegen.

  14. elecTUM: Umsetzung der eLearning-Strategie der Technischen Universität München

    NASA Astrophysics Data System (ADS)

    Rathmayer, Sabine; Gergintchev, Ivan

    An der TUM wurde ein umfassendes und integriertes eLearning-Konzept umgesetzt, welches Präsenzstudium und eLearning in allen Leistungsbereichen der Universität miteinander verzahnt. Ein besonderer Schwerpunkt lag dabei in der Schaffung einer effizienten und wettbewerbsfähigen integrierten eLearning Infrastruktur in Hinblick auf die noch weiter steigenden Studienanfängerzahlen ab dem Jahr 2011 sowie die Umsetzung von eBologna. Die Etablierung einer hochschulweiten Lernplattform stellte eine wesentliche Basis für die Umsetzung der eLearning-Strategie dar. Die wissenschaftliche und wirtschaftliche Anschlussfähigkeit im Hinblick auf eine Verwertung der Projektergebnisse wurde durch die aktive Beteiligung an einer Vielzahl hochschulübergreifender Arbeitskreise, Fachtagungen und Kooperationen, vor allem über Organisations- und Dienstleistungsmodelle sowie innovative technische Entwicklungen, sichergestellt.

  15. Two highly accurate methods for pitch calibration

    NASA Astrophysics Data System (ADS)

    Kniel, K.; Härtig, F.; Osawa, S.; Sato, O.

    2009-11-01

    Among profiles, helix and tooth thickness pitch is one of the most important parameters of an involute gear measurement evaluation. In principle, coordinate measuring machines (CMM) and CNC-controlled gear measuring machines as a variant of a CMM are suited for these kinds of gear measurements. Now the Japan National Institute of Advanced Industrial Science and Technology (NMIJ/AIST) and the German national metrology institute the Physikalisch-Technische Bundesanstalt (PTB) have each developed independently highly accurate pitch calibration methods applicable to CMM or gear measuring machines. Both calibration methods are based on the so-called closure technique which allows the separation of the systematic errors of the measurement device and the errors of the gear. For the verification of both calibration methods, NMIJ/AIST and PTB performed measurements on a specially designed pitch artifact. The comparison of the results shows that both methods can be used for highly accurate calibrations of pitch standards.

  16. Characteristics of the Neutron Irradiation Facilities of the PSI Calibration Laboratory

    SciTech Connect

    Hoedlmoser, H.; Schuler, Ch.; Butterweck, G.; Mayer, S.

    2011-12-13

    The neutron radiation fields of the Calibration Laboratory at Paul Scherrer Institute (PSI) are traceable to the national standards of the Physikalisch-Technische Bundesanstalt (PTB) in Germany. A Berthold LB6411 neutron dose rate meter for neutron radiation is used as a secondary standard. Recently, a thorough characterization of the neutron irradiation fields of the {sup 241}Am-Be and {sup 252}Cf sources by means of reference measurements and a detailed MCNPX simulation of the irradiation facility has been initiated. In this work, the characteristics of the neutron radiation fields are summarized and presented together with model equations and an uncertainty analysis. MCNPX results are shown for the {sup 241}Am-Be source. A comparison of measured and simulated data shows an excellent agreement. From the simulation, valuable information about the neutron fields like the contribution of scattered neutrons in the fields and the energy spectra could be obtained.

  17. Grundlagen

    NASA Astrophysics Data System (ADS)

    Weinzierl, Stefan

    Jede Form der auditiven Kommunikation durchläuft eine Übertragungskette. Im einfachsten Fall besteht sie aus einer Schallquelle, der Luft als akustischem Medium und einem Hörer. Bereits hier beeinflussen die Eigenschaften der Quelle, des Mediums, des umgebenden Raums und des Empfängers das Verständnis der übermittelten Nachricht auf charakteristische Weise. Jeder Musiker und jeder Schauspieler kann bestätigen, wie stark seine "Botschaft“ etwa von den Eigenschaften des Aufführungsraums beeinflusst wird. Selbst in dieser Alltagssituation wird die Kommunikation also durch ein Audiosystem vermittelt und durch dessen Eigenschaften spezifisch geprägt, erst recht natürlich bei der Übertragung durch technische, elektronische Medien.

  18. Grundlagen und Grundbegriffe der Messtechnik

    NASA Astrophysics Data System (ADS)

    Plaßmann, Wilfried

    Es ist eine wesentliche Aufgabe der Messtechnik, technische Vorgänge quantitativ zu erfassen und anhand der gemessenen Größen Funktionsabläufe zu steuern. Als Beispiel sei ein Kraftwerk zur Energieerzeugung genannt, bei dem nur über die Messung von Temperaturen, Leistungen, Drücken und anderen Größen Aussagen über den momentanen Zustand möglich sind und bei Abweichungen vom Sollwert geeignete Eingriffe in das System erfolgen können. Damit eine eindeutige Kommunikation möglich wird, sind die in der Messtechnik verwendeten Begriffe, Messverfahren und Maßeinheiten in entsprechenden Normen oder Vorschriften festgelegt.

  19. Internet discussion forums as part of a student-centred teaching concept of pharmacology.

    PubMed

    Sucha, Michael; Engelhardt, Stefan; Sarikas, Antonio

    2013-01-01

    The world wide web opens up new opportunities to interconnect electronic and classroom teaching and to promote active student participation. In this project article we describe the use of internet discussion forums as part of a student-centred teaching concept of pharmacology and discuss its advantages and disadvantages based on evaluation data and current literature. Final year medical students at the Technische Universität München (Munich, Germany) with the elective pharmacology moderated an internet forum that allowed all students to discuss pharmacology-related questions. Evaluation results of forum participants and elective students demonstrated a learning benefit of internet forums in pharmacology teaching. Internet discussion forums offer an easy-to-implement and effective way to actively engage students and increase the learning benefit of electronic and classroom teaching in pharmacology.

  20. A multi-functional MEMS-SPM for quantitative characterization of nano-objects

    NASA Astrophysics Data System (ADS)

    Li, Zhi; Gao, Sai; Brand, Uwe; Hiller, Karla; Wollschläger, Nicole; Zhang, Xianghui

    2017-06-01

    Based upon the micro-fabrication technology, a series of MEMS scanning probe microscopes (MEMS-SPM) have been developed in the national metrology institute Physikalisch-Technische Bundesanstalt (PTB) in Braunschweig. In comparison with those traditional AFMs, the MEMS-SPM features generally a vertical deflection up to 10 μm with a resolution of 0.2 nm, a non-linearity less than 0.03%, and a testing force up to several hundreds of μN with a force resolution down to 1 nN by means of a capacitive displacement sensing technique. As a result, these MEMS-SPMs can be successfully applied in the field of nanodimensional and nanomechanical metrology. Mechanical design of the MEMS-SPM is reported in this manuscript. Proof-of-principle measurements using a prototype of the MEMS-SPM are detailed in this manuscript, verifying the capabilities of the MEMS-SPM.

  1. A new facility for the synchrotron radiation-based calibration of transfer radiation sources in the ultraviolet and vacuum ultraviolet spectral range

    SciTech Connect

    Thornagel, Reiner; Fliegauf, Rolf; Klein, Roman Kroth, Simone; Paustian, Wolfgang; Richter, Mathias

    2015-01-15

    The Physikalisch-Technische Bundesanstalt (PTB) has a long tradition in the calibration of radiation sources in the ultraviolet and vacuum ultraviolet spectral range, with traceability to calculable synchrotron radiation. Within this context, new instrumentation in the PTB laboratory at the Metrology Light Source (MLS) has been put into operation that opens up extended and improved calibration possibilities. A new facility for radiation source calibrations has been set up in the spectral range from 7 nm to 400 nm based on a combined normal incidence-grazing incidence monochromator. The facility can be used for the calibration of transfer sources in terms of spectral radiant intensity or mean spectral radiance, with traceability to the MLS primary source standard. We describe the design and performance of the experimental station and give examples of some commissioning results.

  2. Analysis of the product gas from biomass gasification by means of laser spectroscopy

    NASA Astrophysics Data System (ADS)

    Karellas, S.; Karl, J.

    2007-09-01

    The use of biomass and waste for decentralised combined heat and power production (CHP) requires highly efficient gasification processes. In the Technische Universität München (TUM), an innovative gasification technology has been developed. This allothermal gasifier is producing a hydrogen- rich, high-calorific gas, that can be further used in a microturbine or a fuel cell producing energy. For the operation of such a system, the online analysis of the composition of the product gas is of high importance, since the efficient working of the machines is linked with the gas quality. For this purpose an optical measurement system based on laser spectroscopy has been applied. This system can measure not only the basic components of the product gas (H 2, CH 4, CO, CO 2, H 2O), but it also gives information concerning the content of high hydrocarbons, the so-called tars, in the product gas.

  3. Diagnostic analysis of the Lake Uluabat in Turkey.

    PubMed

    Degirminci, Hasan; Alp, Ahmet; Buyukcangaz, Hakan

    2006-05-01

    Diagnostic analysis of wetlands is an ordered/structured method of examining wetland systems to identify their values and constraints for the solution of the environmental problems. This study focuses on the diagnostic analysis of Lake Uluabat on the feasibility of "Objective Oriented Project Planning (OOPP)" approach, created by the United States Agency for International Development (USAID) and further improved by the Deutsche Gesellschaft für Technische Zusammenarbeit (GTZ). Negative changes both in water quality and quantity were determined as the core problems. The main results were summarized as the water pollution and fluctuation in the water level caused by the urban and agricultural waste disposals, sedimentation, and overfishing. These negative effects cause loss of biodiversity and damage to crops. Disposal control, training, adequate regulations, and a centralized control and monitoring authority have been proposed to cope with the determined problems.

  4. Final report on bilateral comparison EURAMET.M.T-S3: Torque wrenches (10 N m - 1 kN m)

    NASA Astrophysics Data System (ADS)

    Röske, Dirk; Medina, Nieves

    2011-01-01

    A bilateral comparison from 10 N m up to 1000 N m has been carried out between Physikalisch-Technische Bundesanstalt (PTB) and Centro Español de Metrología (CEM) for reference torque wrenches calibrated according to DKD-R 3-7. The transfer standards have been two reference torque wrenches, 10 N m and 1000 N m respectively, that have been measured between November and December 2010. The results presented here demonstrate the metrological equivalence, within the quoted uncertainties, of both participant laboratories. Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by EURAMET, according to the provisions of the CIPM Mutual Recognition Arrangement (MRA).

  5. L-subshell fluorescence yields and Coster-Kronig transition probabilities with a reliable uncertainty budget for selected high- and medium-Z elements

    NASA Astrophysics Data System (ADS)

    Kolbe, Michael; Hönicke, Philipp; Müller, Matthias; Beckhoff, Burkhard

    2012-10-01

    Photon-in/photon-out experiments at thin specimens have been carried out to determine L-subshell fluorescence yields as well as Coster-Kronig transition probabilities of Au, Pb, Mo, and Pd using radiometrically calibrated instrumentation in the Physikalisch-Technische Bundesanstalt (PTB) laboratory at the electron storage ring BESSY II in Berlin. An advanced approach was developed in order to derive the fluorescence line intensities by means of line sets of each subshell that were corrected for self-absorption and broadened with experimentally determined detector response functions. The respective photoelectric cross sections for each subshell were determined by means of transmission measurements of the same samples without any change in the experimental operating condition. All values derived were compared to those of earlier works. A completely traceable uncertainty budget is provided for the determined values.

  6. Femtosecond laser-induced modification of potassium-magnesium silicate glasses: An analysis of structural changes by near edge x-ray absorption spectroscopy

    NASA Astrophysics Data System (ADS)

    Seuthe, T.; Höfner, M.; Reinhardt, F.; Tsai, W. J.; Bonse, J.; Eberstein, M.; Eichler, H. J.; Grehn, M.

    2012-05-01

    The effects of femtosecond laser pulse irradiation on the glass structure of alkaline silicate glasses were investigated by x-ray absorption near edge structure spectroscopy using the beamline of the Physikalisch-Technische Bundesanstalt at the electron synchrotron BESSY II in Berlin (Germany) by analyzing the magnesium K-edge absorption peak for different laser fluences. The application of fluences above the material modification threshold (2.1 J/cm2) leads to a characteristic shift of ˜1.0 eV in the K-edge revealing a reduced (˜3%) mean magnesium bond length to the ligated oxygen ions (Mg-O) along with a reduced average coordination number of the Mg ions.

  7. Comparison of ionization chamber efficiencies for activity measurements.

    PubMed

    Schrader, H; Svec, A

    2004-01-01

    The calibration of ionization chamber measuring systems in terms of activity is described. The energy-dependent efficiency curves of three chambers at the Bureau International des Poids et Mesures, the National Physical Laboratory and the Physikalisch-Technische Bundesanstalt are determined and compared using a fitting procedure for the experimental radionuclide efficiencies by the Microsoft (MS) EXCEL Solver program. An estimation of the uncertainty of the efficiency curves and the deviations of experimental and calculated radionuclide efficiencies are given. By this fitting method, discrepancies in the efficiency determination can be detected at a level of about one percent. Systematic deviations entering into the calculations either from emission probabilities per decay or from absolute activity standardization are discussed.

  8. Effect of X-ray High-voltage Variations on the Conversion Coefficients.

    PubMed

    Behnke, B; Hupe, O; Behrens, R

    2016-10-20

    Conversion coefficients (CCs) are an essential vehicle in radiation protection for the determination of the dose (rate) of a given radiation field. According to the current draft of the revision of international standard ISO 4037, an X-ray field is a reference field if the CCs of the field match the tabulated ISO values within 2%. Deviations of the high-voltage (HV) tube-potential from its nominal value influence the resulting spectra and change the corresponding CCs. This work investigates the maximum allowable deviation of the HV from its nominal value such that the requirements of ISO 4037 remain fulfilled. This is achieved using both synthetic spectra created by a software simulation program and spectra measured at one of the X-ray facilities of the Physikalisch-Technische Bundesanstalt. The results are summarised in form of a new proposal for upper limit values which are suggested to be used in the next version of ISO 4037.

  9. Nanopositioning and nanomeasuring machine NPMM-200—a new powerful tool for large-range micro- and nanotechnology

    NASA Astrophysics Data System (ADS)

    Jäger, G.; Manske, E.; Hausotte, T.; Müller, A.; Balzer, F.

    2016-09-01

    High-precision metrology has emerged as an enabling technology for modern key technologies. Therefore, at the Technische Universität Ilmenau, a new nanopositioning and nanomeasuring machine NPMM-200 with a measuring range of 200 mm × 200 mm × 25 mm, and a resolution of 0.02 nm was developed. The machine represents the great improvement of the extended three-dimensional Abbe comparator principle to achieve nanometre accuracy. All six degrees of freedom of the mirror plate with the measuring object are measured by fibre-coupled laser interferometers, the signals of which are then used together with the probe system signals for a high-precision position and orientation control and surface and coordinate measurements. This paper presents the metrological concept, the realized design as well as the metrological parameters.

  10. Precise measurement and calculation of coincidence summing corrections for point and linear sources.

    PubMed

    Sima, Octavian; Arnold, Dirk

    2012-09-01

    Point sources of (60)Co, (133)Ba, (134)Cs and (152)Eu, calibrated at Physikalisch-Technische Bundesanstalt were measured in 13 positions on the axis of a 50% relative efficiency p-type detector. The peak and total efficiencies were calibrated using single photon emitting nuclides. Precise experimental values of the coincidence summing corrections were evaluated in each geometry. Synthetic linear source data, as well as the corresponding peak and total efficiency curves, were prepared using the dependence of the count rates on the position of the emitting point. The coincidence summing corrections for the linear sources were computed, analyzed with respect to different approximations and compared with simulations carried out with GESPECOR. Copyright © 2012 Elsevier Ltd. All rights reserved.

  11. High-Accuracy Emissivity Data on the Coatings Nextel 811-21, Herberts 1534, Aeroglaze Z306 and Acktar Fractal Black

    NASA Astrophysics Data System (ADS)

    Adibekyan, A.; Kononogova, E.; Monte, C.; Hollandt, J.

    2017-07-01

    The Physikalisch-Technische Bundesanstalt determined the directional spectral emissivities of several widely used black coatings: Nextel 811-21, Herberts 1534, Aeroglaze Z306 and Acktar Fractal Black. These are and were often applied in different industrial and scientific applications. The measurements are taken angularly resolved over a range from 10° to 70°. They cover the temperature range typical for the application of the respective coating and a wide wavelength range from 4 μm to 100 μm. The respective directional total emissivities and hemispherical total emissivities are given as well. The measurements were taken under vacuum at the reduced background calibration facility to achieve low uncertainties and avoid atmospheric interferences. Additionally, some measurements were taken with the emissivity measurement setup in air.

  12. Predicting water suppy and actual evapotranspiration of street trees

    NASA Astrophysics Data System (ADS)

    Wessolek, Gerd; Heiner, Moreen; Trinks, Steffen

    2017-04-01

    It's well known that street trees cool air temperature in summer-time by transpiration and shading and also reduce runoff. However, it's difficult to analyse if trees have water shortage or not. This contribution focus on predicting water supply, actual evapotranspiration, and runoff by using easily available climate data (precipiation, potential evapotranspiration) and site characteristics (water retention, space, sealing degree, groundwater depth). These parameter were used as input data for Hydro-Pedotransfer-Functions (HPTFs) allowing the estimation of the annual water budget. Results give statements on water supply of trees, drought stress, and additional water demand by irrigation. Procedure also analyse, to which extent the surrounding partly sealed surfaces deliver water to the trees. Four representative street canyons of Berlin City were analysed and evaluated within in training program for M.A. students of „Urban Eco-system Science" at the Technische Universität Berlin.

  13. Automated assembly of holder chips to AFM probes

    NASA Astrophysics Data System (ADS)

    Reinhart, Gunther; Jacob, Dirk; Fouchier, Marc

    2001-10-01

    At the Belgian institute IMEC techniques for the production of electrically conductive atomic force microscope (AFM) probes are developed. To facilitate handling of the fragile probes, holder chips are required. The assembly of such holder chips, which can be split up into the application of solder paste, the positioning of the holder chip and the soldering of the chip, is a crucial manufacturing step, that, until now, was performed manually for economic reasons. With the help of a modular micro assembly tool, developed by the Institute for Machine Tools and Industrial Management (iwb) of the Technische Universitaet Muenchen, an economical automated assembly of the holder chips was developed. Thanks to our integrated sensor technology, even the automated assembly onto the extremely fragile membranes of moulded AFM probes was possible. In particular, the dispensing process of the solder paste onto the membranes was improved by the integration of a non-contact sensor for the needle clearance.

  14. SOLAR/SOLSPEC: Scientific Objectives, Instrument Performance and Its Absolute Calibration Using a Blackbody as Primary Standard Source

    NASA Astrophysics Data System (ADS)

    Thuillier, G.; Foujols, T.; Bolsée, D.; Gillotay, D.; Hersé, M.; Peetermans, W.; Decuyper, W.; Mandel, H.; Sperfeld, P.; Pape, S.; Taubert, D. R.; Hartmann, J.

    2009-06-01

    SOLAR is a set of three solar instruments measuring the total and spectral absolute irradiance from 16 nm to 3080 nm for solar, atmospheric and climatology physics. It is an external payload for the COLUMBUS laboratory launched on 7 February 2008. The mission’s primary objective is the measurement of the solar irradiance with the highest possible accuracy, and its variability using the following instruments: SOL-ACES (SOLar Auto-Calibrating EUV/UV Spectrophotometers) consists of four grazing incidence planar gratings measuring from 16 nm to 220 nm; SOLSPEC (SOLar SPECtrum) consists of three double gratings spectrometers, covering the range 165 nm to 3080 nm; and SOVIM (SOlar Variability Irradiance Monitor) is combining two types of absolute radiometers and three-channel filter - radiometers. SOLSPEC and SOL-ACES have been calibrated by primary standard radiation sources of the Physikalisch-Technische Bundesanstalt (PTB). Below we describe SOLSPEC, and its performance.

  15. Reinraumtechnik für die Medizintechnik

    NASA Astrophysics Data System (ADS)

    Petek, Max; Jungbluth, Martin; Krampe, Erhard

    Die Reinraumtechnik ist heute ein unverzichtbarer Bestandteil bei der Fertigung von Produkten der Life Sciences, den Bereichen Pharma, Lebensmittel, Kosmetik und Medizintechnik. In Anbetracht der langen Historie der Medizintechnik ist sie jedoch eine sehr junge Disziplin. Die Bedeutung von Keimen und die richtige Einschätzung ihrer Größe wurden zwar sehr früh bereits durch Paracelsus erkannt, jedoch wurden daraus noch keine speziellen oder kontinuierlich umgesetzten Hygienevorschriften abgeleitet. Die erste bekannte technische Umsetzung von Hygieneempfehlungen geht auf den Franzosen François Nicolas Appert zurück, der eine aseptische Abfüllmethode für Lebensmittel entwickelte und diese 1810 veröffentlichte [1]. Die erste dokumentierte medizinische Umsetzung stellten Hygienevorschriften für Ärzte dar, die Ignaz Philipp Semmelweis nach 1847 in der Wiener Klinik für Geburtshilfe einführte [2].

  16. Aerodynamic analysis of a helicopter fuselage with rotating rotor head

    NASA Astrophysics Data System (ADS)

    Reß, R.; Grawunder, M.; Breitsamter, Ch.

    2015-06-01

    The present paper describes results of wind tunnel experiments obtained during a research programme aimed at drag reduction of the fuselage of a twin engine light helicopter configuration. A 1 : 5 scale model of a helicopter fuselage including a rotating rotor head and landing gear was investigated in the low-speed wind tunnel A of Technische Universität a München (TUM). The modelled parts of the helicopter induce approxiu mately 80% of the total parasite drag thus forming a major potential for shape optimizations. The present paper compares results of force and moment measurements of a baseline configuration and modified variants with an emphasis on the aerodynamic drag, lift, and yawing moment coefficients.

  17. Fully automated hybrid diode laser assembly using high precision active alignment

    NASA Astrophysics Data System (ADS)

    Böttger, Gunnar; Weber, Daniel; Scholz, Friedemann; Schröder, Henning; Schneider-Ramelow, Martin; Lang, Klaus-Dieter

    2016-03-01

    Fraunhofer IZM, Technische Universität Berlin and eagleyard Photonics present various implementations of current micro-optical assemblies for high quality free space laser beam forming and efficient fiber coupling. The laser modules shown are optimized for fast and automated assembly in small form factor packages via state-of-the-art active alignment machinery, using alignment and joining processes that have been developed and established in various industrial research projects. Operational wavelengths and optical powers ranging from 600 to 1600 nm and from 1 mW to several W respectively are addressed, for application in high-resolution laser spectroscopy, telecom and optical sensors, up to the optical powers needed in industrial and medical laser treatment.

  18. Ginger: Measuring Gravitomagnetic Effects by Means of Light

    NASA Astrophysics Data System (ADS)

    Tartaglia, Angelo

    2015-01-01

    GINGER is a proposal for a new experiment aimed to the detection of the gravito-magnetic Lense-Thirring effect at the surface of the Earth. A three-dimensional set of ring lasers will be mounted on a rigid "monument". In a ring laser a light beam traveling counterclockwise is superposed to another beam traveling in the opposite sense. The anisotropy in the propagation leads to standing waves with slightly different frequencies in the two directions; the resulting beat frequency is proportional to the absolute rotation rate in space, including the gravito-magnetic drag. The experiment is planned to be built in the Gran Sasso National Laboratories in Italy and is based on an international collaboration among four Italian groups, the Technische Universität München and the University of Canterbury in Christchurch (NZ).

  19. Determining orbital particle parameters of impacts into germanium using morphology analysis and calibration data from hypervelocity impact experiments in the laboratory

    NASA Technical Reports Server (NTRS)

    Paul, Klaus G.

    1995-01-01

    This paper describes the work that is done at the Lehrstuhl fur Raumfahrttechnik (lrt) at the Technische Universitat Munchen to examine particle impacts into germanium surfaces which were flown on board the LDEF satellite. Besides the description of the processing of the samples, a brief overview of the particle launchers at our institute is given together with descriptions of impact morphology of high- and hypervelocity particles into germanium. Since germanium is a brittle, almost glass-like material, the impact morphology may also be interesting for anyone dealing with materials such as optics and solar cells. The main focus of our investigations is to learn about the impacting particle's properties, for example mass, velocity and direction. This is done by examining the morphology, various geometry parameters, crater obliqueness and crater volume.

  20. Source-based calibration of space instruments using calculable synchrotron radiation

    NASA Astrophysics Data System (ADS)

    Klein, Roman; Fliegauf, Rolf; Kroth, Simone; Paustian, Wolfgang; Reichel, Thomas; Richter, Mathias; Thornagel, Reiner

    2016-10-01

    Physikalisch-Technische Bundesanstalt (PTB) has more than 20 years of experience in the calibration of space-based instruments using synchrotron radiation to cover the ultraviolet (UV), vacuum UV (VUV), and x-ray spectral range. Over the past decades, PTB has performed calibrations for numerous space missions within scientific collaborations and has become an important partner for activities in this field. New instrumentation at the electron storage ring, metrology light source, creates additional calibration possibilities within this framework. A new facility for the calibration of radiation transfer source standards with a considerably extended spectral range has been put into operation. The commissioning of a large vacuum vessel that can accommodate entire space instruments opens up new prospects. Finally, an existing VUV transfer calibration source was upgraded to increase the spectral range coverage to a band from 15 to 350 nm.

  1. 237Np absolute delayed neutron yield measurements

    NASA Astrophysics Data System (ADS)

    Doré, D.; Ledoux, X.; Nolte, R.; Gagnon-Moisan, F.; Thulliez, L.; Litaize, O.; Roettger, S.; Serot, O.

    2017-09-01

    237Np absolute delayed neutron yields have been measured at different incident neutron energies from 1.5 to 16 MeV. The experiment was performed at the Physikalisch-Technische Bundesanstalt (PTB) facility where the Van de Graaff accelerator and the cyclotron CV28 delivered 9 different neutron energy beams using p+T, d+D and d+T reactions. The detection system is made up of twelve 3He tubes inserted into a polyethylene cylinder. In this paper, the experimental setup and the data analysis method are described. The evolution of the absolute DN yields as a function of the neutron incident beam energies are presented and compared to experimental data found in the literature and data from the libraries.

  2. High energy neutron response characteristics of a passive survey instrument for the determination of cosmic radiation fields in aircraft.

    PubMed

    Bartlett, D T; Tanner, R J; Hager, L G

    2002-01-01

    A passive survey instrument has been developed for the determination of cosmic radiation fields in aircraft. The instrument contains 30 TLDs and 36 PADC etched track detectors in order to obtain the required precision and an isotropic response. Two active electronic personal dosemeters are included to record the time profile of the field intensity. The instrument is robust and reliable, and is particularly useful to verify values of route doses based on calculations. The energy of the neutron component of the field to be determined extends to over 500 MeV, but with the majority of the dose equivalent below 200 MeV. The results are reported of measurements at Uppsala University and Physikalisch-Technische Bundesanstalt of the response characteristics of the instrument to quasi-monoenergetic neutrons in the energy range 60 to 180 MeV and for monoenergetic neutrons of energy from 70 keV to 14.7 MeV.

  3. Gernot Renger (1937-2013): his life, Max-Volmer Laboratory, and photosynthesis research.

    PubMed

    Siggel, Ulrich; Schmitt, Franz-Josef; Messinger, Johannes

    2016-08-01

    Gernot Renger (October 23, 1937-January 12, 2013), one of the leading biophysicists in the field of photosynthesis research, studied and worked at the Max-Volmer-Institute (MVI) of the Technische Universität Berlin, Germany, for more than 50 years, and thus witnessed the rise and decline of photosynthesis research at this institute, which at its prime was one of the leading centers in this field. We present a tribute to Gernot Renger's work and life in the context of the history of photosynthesis research of that period, with special focus on the MVI. Gernot will be remembered for his thought-provoking questions and his boundless enthusiasm for science.

  4. Cross sections for ionization of tetrahydrofuran by protons at energies between 300 and 3000 keV

    NASA Astrophysics Data System (ADS)

    Wang, Mingjie; Rudek, Benedikt; Bennett, Daniel; de Vera, Pablo; Bug, Marion; Buhr, Ticia; Baek, Woon Yong; Hilgers, Gerhard; Rabus, Hans

    2016-05-01

    Double-differential cross sections for ionization of tetrahydrofuran by protons with energies from 300 to 3000 keV were measured at the Physikalisch-Technische Bundesanstalt ion accelerator facility. The electrons emitted at angles between 15∘ and 150∘ relative to the ion-beam direction were detected with an electrostatic hemispherical electron spectrometer. Single-differential and total ionization cross sections have been derived by integration. The experimental results are compared to the semiempirical Hansen-Kocbach-Stolterfoht model as well as to the recently reported method based on the dielectric formalism. The comparison to the latter showed good agreement with experimental data in a broad range of emission angles and energies of secondary electrons. The scaling property of ionization cross sections for tetrahydrofuran was also investigated. Compared to molecules of different size, the ionization cross sections of tetrahydrofuran were found to scale with the number of valence electrons at large impact parameters.

  5. Continuous calibration of a vacuum ultraviolet system from 65 to 125 nm by a cascade arc and comparison with the calibrated line radiation of a hollow cathode.

    PubMed

    Frost, R M; Awakowicz, P

    1997-03-20

    A high-power stationary helium cascade arc has been developed as a standard source for continuum radiation in the VUV spectral range from 65 to 125 nm. The calibration of the VUV system response was based on the calculated and measured continuum radiation of a 2-mmphi pure He arc. Diagnostics of the arc plasma in partial thermal equilibrium yielded the electron density and the temperature that were inserted in the calculations of the continuous radiation. The results were compared with the helium, argon, and krypton radiation lines of a high-current hollow cathode lamp. This lamp was built according to the construction drawings of a hollow cathode, which was calibrated by means of the electron synchrotron radiation at the Physikalisch Technische Bundesanstalt Berlin.

  6. Alpha-induced reactions on selenium between 11 and 15 MeV

    NASA Astrophysics Data System (ADS)

    Fiebiger, Stefan; Slavkovská, Zuzana; Giesen, Ulrich; Göbel, Kathrin; Heftrich, Tanja; Heiske, Annett; Reifarth, René; Schmidt, Stefan; Sonnabend, Kerstin; Thomas, Benedikt; Weigand, Mario

    2017-07-01

    The production of 77,79,85,85m Kr and 77Br via the reaction Se(α ,x) was investigated between {E}α =11 and 15 MeV using the activation technique. The irradiation of natural selenium targets on aluminum backings was conducted at the Physikalisch-Technische Bundesanstalt (PTB) in Braunschweig, Germany. The spectroscopic analysis of the reaction products was performed using a high-purity germanium detector located at PTB and a low energy photon spectrometer detector at the Goethe University Frankfurt, Germany. Thick-target yields were determined. The corresponding energy-dependent production cross sections of 77,79,85,85m Kr and 77Br were calculated from the thick-target yields. Good agreement between experimental data and theoretical predictions using the TALYS-1.6 code was found.

  7. Reduction of the uncertainty of the PTB vacuum pressure scale by a new large area non-rotating piston gauge

    NASA Astrophysics Data System (ADS)

    Bock, Th; Ahrendt, H.; Jousten, K.

    2009-10-01

    This paper describes the metrological characterization of a new large area piston gauge (FRS5, Furness Rosenberg Standard) installed at the vacuum metrology laboratory of the Physikalisch-Technische Bundesanstalt (PTB). The operational procedure and the uncertainty budget for pressures between 30 Pa and 11 kPa are given. Comparisons between the FRS5 and a mercury manometer, a rotary piston gauge and a force-balanced piston gauge are described. We show that the reproducibility of the calibration values of capacitance diaphragm gauges is enhanced by a factor of 6 compared with a static expansion primary standard (SE2). Improvements of the SE2 performance by reducing the number of expansions and smaller uncertainties of expansion ratios are discussed.

  8. Privacy im Social Semantic Web

    NASA Astrophysics Data System (ADS)

    Nagenborg, Michael

    Der Schwerpunkt dieses Beitrages liegt auf dem Design von Infrastrukturen, welche es ermöglichen sollen, private Daten kontrolliert preiszugeben und auszutauschen. Zunächst wird daran erinnert, dass rechtliche und technische Maßnahmen zum Datenschutz stets auch dazu dienen, den Austausch von Daten zu ermöglichen. Die grundlegende Herausforderung besteht darin, der sozialen und politischen Bedeutung des Privaten Rechnung zu tragen. Privatheit wird aus der Perspektive der Informationsethik dabei als ein normatives, handlungsleitendes Konzept verstanden. Als Maßstab für die Gestaltung der entsprechenden Infrastrukturen wird auf Helen Nissenbaums Konzept der privacy as contextual integrity" zurückgegriffen, um u. a. die Ansätze der end-to-end information accountability" [38] und des Privacy Identity Management for Europe"- Projektes zu diskutieren.

  9. In vivo dosimetry in the urethra using alanine/ESR during (192)Ir HDR brachytherapy of prostate cancer--a phantom study.

    PubMed

    Anton, Mathias; Wagner, Daniela; Selbach, Hans-Joachim; Hackel, Thomas; Hermann, Robert Michael; Hess, Clemens Friedrich; Vorwerk, Hilke

    2009-05-07

    A phantom study for dosimetry in the urethra using alanine/ESR during (192)Ir HDR brachytherapy of prostate cancer is presented. The measurement method of the secondary standard of the Physikalisch-Technische Bundesanstalt had to be slightly modified in order to be able to measure inside a Foley catheter. The absorbed dose to water response of the alanine dosimetry system to (192)Ir was determined with a reproducibility of 1.8% relative to (60)Co. The resulting uncertainty for measurements inside the urethra was estimated to be 3.6%, excluding the uncertainty of the dose rate constant Lambda. The applied dose calculated by a treatment planning system is compared to the measured dose for a small series of (192)Ir HDR irradiations in a gel phantom. The differences between the measured and applied dose are well within the limits of uncertainty. Therefore, the method is considered to be suitable for measurements in vivo.

  10. Pre-flight calibration of LYRA, the solar VUV radiometer on board PROBA2

    NASA Astrophysics Data System (ADS)

    Benmoussa, A.; Dammasch, I. E.; Hochedez, J.-F.; Schühle, U.; Koller, S.; Stockman, Y.; Scholze, F.; Richter, M.; Kroth, U.; Laubis, C.; Dominique, M.; Kretzschmar, M.; Mekaoui, S.; Gissot, S.; Theissen, A.; Giordanengo, B.; Bolsee, D.; Hermans, C.; Gillotay, D.; Defise, J.-M.; Schmutz, W.

    2009-12-01

    Aims. LYRA, the Large Yield Radiometer, is a vacuum ultraviolet (VUV) solar radiometer, planned to be launched in November 2009 on the European Space Agency PROBA2, the Project for On-Board Autonomy spacecraft. Methods: The instrument was radiometrically calibrated in the radiometry laboratory of the Physikalisch-Technische Bundesanstalt (PTB) at the Berlin Electron Storage ring for SYnchroton radiation (BESSY II). The calibration was done using monochromatized synchrotron radiation at PTB's VUV and soft X-ray radiometry beamlines using reference detectors calibrated with the help of an electrical substitution radiometer as the primary detector standard. Results: A total relative uncertainty of the radiometric calibration of the LYRA instrument between 1% and 11% was achieved. LYRA will provide irradiance data of the Sun in four UV passbands and with high temporal resolution down to 10 ms. The present state of the LYRA pre-flight calibration is presented as well as the expected instrument performance.

  11. Irradiation stability of silicon photodiodes for extreme-ultraviolet radiation

    NASA Astrophysics Data System (ADS)

    Scholze, Frank; Klein, Roman; Bock, Thomas

    2003-10-01

    Photodiodes are used as easy-to-operate detectors in the extreme-ultraviolet spectral range. At the Physikalisch-Technische Bundesanstalt photodiodes are calibrated with an uncertainty of spectral responsivity of 0.3% or less. Stable photodiodes are a prerequisite for the dissemination of these high-accuracy calibrations to customers. Silicon photodiodes with different top layers were exposed to intense extreme-ultraviolet irradiation. Diodes coated with diamondlike carbon or TiSiN proved to be stable within a few percent up to a radiant exposure of 100 kJ/cm2. The changes in responsivity could be explained as being due to carbon contamination and to changes in the internal charge collection efficiency. In ultrahigh vacuum, no indication of oxidation was found.

  12. The TUBIN nanosatellite mission for wildfire detection in thermal infrared

    NASA Astrophysics Data System (ADS)

    Barschke, Merlin F.; Bartholomäus, Julian; Gordon, Karsten; Lehmann, Marc; Brieß, Klaus

    2016-11-01

    The increasing number of wildfires has significant impact on the Earth's climate system. Furthermore, they cause severe economic damage in many parts of the world. While different land and airborne wildfire detection and observation systems are in use in some areas of the world already, spaceborne systems offer great potential regarding global and continuous observation. TUBIN is a proof-of-concept mission to demonstrate the capabilities of a nanosatellite carrying lightweight infrared microbolometer arrays for spaceborne detection of wildfires and other high-temperature events. To this end, TUBIN carries two infrared microbolometers complemented by a CMOS imager. The TUBIN space segment is based on the TUBiX20 nanosatellite platform of Technische Universität Berlin and is the first mission that implements the full-scale attitude determination and control system of TUBiX20. Thereby, the TUBIN mission will demonstrate the platform's ability to support a challenging Earth observation mission.

  13. In vivo dosimetry in the urethra using alanine/ESR during 192Ir HDR brachytherapy of prostate cancer—a phantom study

    NASA Astrophysics Data System (ADS)

    Anton, Mathias; Wagner, Daniela; Selbach, Hans-Joachim; Hackel, Thomas; Hermann, Robert Michael; Hess, Clemens Friedrich; Vorwerk, Hilke

    2009-05-01

    A phantom study for dosimetry in the urethra using alanine/ESR during 192Ir HDR brachytherapy of prostate cancer is presented. The measurement method of the secondary standard of the Physikalisch-Technische Bundesanstalt had to be slightly modified in order to be able to measure inside a Foley catheter. The absorbed dose to water response of the alanine dosimetry system to 192Ir was determined with a reproducibility of 1.8% relative to 60Co. The resulting uncertainty for measurements inside the urethra was estimated to be 3.6%, excluding the uncertainty of the dose rate constant Λ. The applied dose calculated by a treatment planning system is compared to the measured dose for a small series of 192Ir HDR irradiations in a gel phantom. The differences between the measured and applied dose are well within the limits of uncertainty. Therefore, the method is considered to be suitable for measurements in vivo.

  14. The PTB electromagnetic undulator for BESSY II.

    PubMed

    Klein, R; Bahrdt, J; Herzog, D; Ulm, G

    1998-05-01

    The Physikalisch-Technische Bundesanstalt (PTB) will operate an electromagnetic undulator designed for radiometry at the BESSY II storage ring. The undulator has a period length of 180 mm, 21 full periods and a maximum magnetic induction of 0.46 T, resulting in a tuning range of the first harmonic from 5 to 150 eV at 1.7 GeV electron energy. Moreover, the electromagnetic design allows the undulator to be operated in a special mode with the period length doubled to 360 mm, thus accordingly shifting the tuning range to lower energies. The main design parameters of the undulator for radiometric applications, as well as measured magnetic field data, are presented.

  15. Investigation of Calibrating Force Transducer Using Sinusoidal Force

    SciTech Connect

    Zhang Li; Wang Yu; Zhang Lizhe

    2010-05-28

    Sinusoidal force calibration method was studied several years before at Physikalisch-Technische Bundesanstalt (PTB). A similar dynamic force calibration system is developed at Changcheng Institute of Metrology and Measurement (CIMM). It uses electro-dynamic shakers to generate dynamic force in the range from 1 N to 20 kN, and heterodyne laser interferometers are used for acceleration measurement. The force transducer to be calibrated is mounted on the shaker, and a mass block is screwed on the top of force transducer, the sinusoidal forces realized by accelerated load masses are traceable to acceleration and mass according to the force definition. The methods of determining Spatial-dependent acceleration on mass block and measuring the end mass of force transducer in dynamic force calibration are discussed in this paper.

  16. [Standardization of technical terminology].

    PubMed

    Wesolowski, Tilmann

    2010-01-01

    This paper analyzes the example of the publishers Oldenbourg and the publication of the 'Illustrierte Technische Wörterbücher' (ITW), a multilingual dictionary which competed with a similar project that the Verein Deutscher Ingenieure (VDI) had already initiated. Its willingness to challenge the vast and well-funded VDI with this project--and to tackle the immense difficulties associated with the dictionary itself, which pioneered the standardization of technical terminology across six languages--indicates that for Oldenbourg, this project was of paramount importance to its reputation. The decision to take the challenge and publish the ITW was the starting point of Alfred Schlomann's career as well as the foundation of Oldenbourgs reputation as a premier publishing house and pioneered the standardization of technical terminology. The example shows that the publishers' decisions had been of paramount importance not only for scientists' careers and as gatekeeper of the scientific community but can also influence the development of science.

  17. Electron counting capacitance standard and quantum metrology triangle experiments at PTB

    NASA Astrophysics Data System (ADS)

    Scherer, H.; Schurr, J.; Ahlers, F. J.

    2017-06-01

    This paper summarizes the final results of the electron counting capacitance standard experiment at the Physikalisch-Technische Bundesanstalt (PTB) achieved since the publication of a preliminary result in 2012. All systematic uncertainty contributions were experimentally quantified and are discussed. Frequency-dependent measurements on the 1 pF cryogenic capacitor were performed using a high-precision transformer-based capacitance bridge with a relative uncertainty of 0.03 µF F-1. The results revealed a crucial problem related to the capacitor, which hampered realizing the quantum metrology triangle with an accuracy corresponding to a combined total uncertainty of better than a few parts per million and eventually caused the discontinuation of the experiment at PTB. This paper provides a conclusion on the implications for future quantum metrology triangle experiments from the latest CODATA adjustment of fundamental constants, and summarizes perspectives and outlooks on future quantum metrology triangle experiments based on topical developments in small-current metrology.

  18. New prospects in solar cooking

    SciTech Connect

    Grupp, M.; Klingshirn, A.

    1992-12-31

    Two studies have been completed recently for Gesellschaft fur Technische Zusammenarbeit and German Appropriate Technology Exchange. The first of these studies contains the following: a classification scheme for solar cookers according to collector type, heat transfer mechanism, and type of use; an assessment of the potential interest of different cooker concepts; a catalogue of 160 different solar cookers that have been tested and/or used in the field. The second study highlights the potential advantages of multi-energy (solar plus back-up) cooking and analyzes its particular boundary conditions. A choice of possible concepts for use in institutions is presented. Particular attention is paid to the problem of efficient heat transfer into removable cooking vessels. Social and cultural factors concerning the acceptance of new technologies are also discussed.

  19. Simulation studies on a prototype ionisation chamber for measurement of personal dose equivalent, Hp(10).

    PubMed

    Cardoso, J; Carvalho, A F; Oliveira, C

    2007-01-01

    A prototype ionisation chamber for direct measurement of the personal dose equivalent, Hp(10), similar to the one developed by the Physikalisch-Technische Bundesantalt (PTB), was designed and constructed by the Metrological Laboratory of Ionizing Radiation (LMRI) of Nuclear and Technological Institute (ITN). Tests already performed have shown that the behaviour of this chamber is very similar to the PTB chamber, mainly the energy dependence for the X-ray radiation qualities of the ISO 4037-1 narrow series N-30, N-40, N-60, N-80, N-100 and N-120 and also for gamma radiation of 137Cs and 60Co. However, the results obtained also show a dependence on the energy and angles of incident radiation and a low magnitude of the electrical response of the ionisation chamber. In order to optimise the performance of the chamber, the LMRI initiated numerical simulation of this ionisation chamber by Monte Carlo method using the MCNPX code.

  20. The TUBIN nanosatellite mission for wildfire detection in thermal infrared

    NASA Astrophysics Data System (ADS)

    Barschke, Merlin F.; Bartholomäus, Julian; Gordon, Karsten; Lehmann, Marc; Brieß, Klaus

    2017-06-01

    The increasing number of wildfires has significant impact on the Earth's climate system. Furthermore, they cause severe economic damage in many parts of the world. While different land and airborne wildfire detection and observation systems are in use in some areas of the world already, spaceborne systems offer great potential regarding global and continuous observation. TUBIN is a proof-of-concept mission to demonstrate the capabilities of a nanosatellite carrying lightweight infrared microbolometer arrays for spaceborne detection of wildfires and other high-temperature events. To this end, TUBIN carries two infrared microbolometers complemented by a CMOS imager. The TUBIN space segment is based on the TUBiX20 nanosatellite platform of Technische Universität Berlin and is the first mission that implements the full-scale attitude determination and control system of TUBiX20. Thereby, the TUBIN mission will demonstrate the platform's ability to support a challenging Earth observation mission.

  1. SMARD-REXUS-18: Development and Verification of an SMA Based CubeSat Solar Panel Deployment Mechanism

    NASA Astrophysics Data System (ADS)

    Grulich, M.; Koop, A.; Ludewig, P.; Gutsmiedl, J.; Kugele, J.; Ruck, T.; Mayer, I.; Schmid, A.; Dietmann, K.

    2015-09-01

    SMARD (Shape Memory Alloy Reusable Deployment Mechanism) is an experiment for a sounding rocket developed by students at Technische Universität MUnchen (TUM). It was launched in March 2015 on REXUS 18 (Rocket Experiments for University Students). The goal of SMARD was to develop a solar panel holddown and release mechanism (HDRM) for a CubeSat using shape memory alloys (SMA) for repeatable actuation and the ability to be quickly resettable. This paper describes the technical approach as well as the technological development and design of the experiment platform, which is capable of proving the functionality of the deployment mechanism. Furthermore, the realization of the experiment as well as the results of the flight campaign are presented. Finally, the future applications of the developed HDRM and its possible further developments are discussed.

  2. Status and Plans for the Vienna VLBI and Satellite Software (VieVS 3.0)

    NASA Astrophysics Data System (ADS)

    Gruber, Jakob; Böhm, Johannes; Böhm, Sigrid; Girdiuk, Anastasiia; Hellerschmied, Andreas; Hofmeister, Armin; Krásná, Hana; Kwak, Younghee; Landskron, Daniel; Madzak, Matthias; Mayer, David; McCallum, Jamie; Plank, Lucia; Schartner, Matthias; Shabala, Stas; Teke, Kamil; Sun, Jing

    2017-04-01

    The Vienna VLBI and Satellite Software (VieVS) is a geodetic analysis software developed and maintained at Technische Universität Wien (TU Wien) with contributions from groups all over the world. It is used for both academic purposes in university courses as well as for providing Very Long Baseline Interferometry (VLBI) analysis results to the geodetic community. Written in a modular structure in Matlab, VieVS offers easy access to the source code and the possibility to adapt the programs for particular purposes. The new version 3.0, released in early 2017, includes several new features, e.g., improved scheduling capabilities for observing quasars and satellites. This poster gives an overview of all VLBI-related activities in Vienna and provides an outlook to future plans concerning the Vienna VLBI and Satellite Software (VieVS).

  3. Monte-Carlo simulations of a high-resolution neutron TOF instrument

    NASA Astrophysics Data System (ADS)

    Bernhardt, Ph; Demmel, F.; Magerl, A.

    2000-03-01

    It is proposed to build a flexible, high-resolution time-of-flight diffractometer and spectrometer at the new reactor FRM II of the Technische Universität München. To optimize the layout of individual components and to estimate the performance of the entire instrument, we have made analytical calculations and Monte-Carlo simulations mainly with “McStas”, programmed by RISØ, Denmark. MC simulation routines for neutron devices like curved guides, disc- and Fermi choppers have been added. The influence of curved guides in neutron phase space has been developed and will be presented. Line shapes of neutron pulses and transmission have been studied for a Fermi chopper with straight slits and will be compared with the results of simulation.

  4. The new small-angle neutron scattering instrument SANS-1 at MLZ-characterization and first results

    NASA Astrophysics Data System (ADS)

    Mühlbauer, S.; Heinemann, A.; Wilhelm, A.; Karge, L.; Ostermann, A.; Defendi, I.; Schreyer, A.; Petry, W.; Gilles, R.

    2016-10-01

    A thorough characterization of the key features of the new small-angle neutron scattering instrument SANS-1 at MLZ, a joint project of Technische Universität München and Helmholtz Zentrum Geesthacht, is presented. Measurements of the neutron beam profile, divergency and flux are given for various positions along the instrument including the sample position, and agree well with Monte Carlo simulations of SANS-1 using the program McStas. Secondly, the polarization option of SANS-1 is characterized for a broad wavelength band. A key feature of SANS-1 is the large accessible Q-range facilitated by the sideways movement of the detector. Particular attention is hence paid to the effects that arise due to large scattering angles on the detector where a standard cos3 solid angle correction is no longer applicable. Finally the performance of the instrument is characterized by a set of standard samples.

  5. CORRECTION FACTORS FOR ATTENUATION AND SCATTERING OF THE WALL OF A CYLINDRICAL IONIZATION CHAMBER IN THE 6-7 MeV HIGH-ENERGY PHOTON REFERENCE FIELD.

    PubMed

    Kowatari, M; Zutz, H; Hupe, O

    2017-06-07

    In high-energy photon reference fields the value of the air kerma rate is determined by using ionization chambers (ICs). From the charge collected inside the IC the dose can be calculated using a set of calibration and correction factors according to ISO 4037-2. A crucial parameter is the correction for the attenuation and scattering of the primary radiation due to the chamber wall. This parameter can be determined using Monte Carlo calculations. The evaluation of the factor was performed for a commercially available IC of the type Victoreen 550-3 under different build-up conditions. The results were verified by measurements in the R-F high-energy photon fields according to ISO 4037-1 at the Physikalisch-Technische Bundesanstalt (PTB) and the Japan Atomic Energy Agency (JAEA). © The Author 2017. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oup.com.

  6. Investigation of Calibrating Force Transducer Using Sinusoidal Force

    NASA Astrophysics Data System (ADS)

    Zhang, Li; Wang, Yu; Zhang, Lizhe

    2010-05-01

    Sinusoidal force calibration method was studied several years before at Physikalisch-Technische Bundesanstalt (PTB). A similar dynamic force calibration system is developed at Changcheng Institute of Metrology and Measurement (CIMM). It uses electro-dynamic shakers to generate dynamic force in the range from 1 N to 20 kN, and heterodyne laser interferometers are used for acceleration measurement. The force transducer to be calibrated is mounted on the shaker, and a mass block is screwed on the top of force transducer, the sinusoidal forces realized by accelerated load masses are traceable to acceleration and mass according to the force definition. The methods of determining Spatial-dependent acceleration on mass block and measuring the end mass of force transducer in dynamic force calibration are discussed in this paper.

  7. Characterization of Bonner sphere systems at monoenergetic and thermal neutron fields.

    PubMed

    Lacoste, V; Gressier, V; Pochat, J-L; Fernández, F; Bakali, M; Bouassoule, T

    2004-01-01

    The Institute for Radiological Protection and Nuclear Safety (IRSN) and the GFR, Universitat Autónoma de Barcelona (UAB) use Bonner spheres (BS) for neutron spectrometry at workplaces. The two systems, equipped with similar cylindrical 3He proportional counters, were simulated with the MCNP Monte-Carlo code to determine the response to neutrons of different energies for each polyethylene sphere. The BS systems were characterized at monoenergetic and thermal neutron fields. Measurements were performed at the Physikalisch-Technische Bundesanstalt (PTB) and at the National Physical Laboratory (NPL) standard laboratories, and with the newly characterized IRSN 'SIGMA' thermal neutron facility. The energy distribution of the reference neutron fluence was folded with the response functions for comparison purposes with the experimental data. In almost all cases related to monoenergetic neutrons, a good agreement between the experimental and the calculated count rates was found, and some discrepancies of a few per cent were observed in the thermal region.

  8. p-Terphenyl: An alternative to liquid scintillators for neutron detection

    NASA Astrophysics Data System (ADS)

    Sardet, A.; Varignon, C.; Laurent, B.; Granier, T.; Oberstedt, A.

    2015-08-01

    A detailed characterization of doped paraterphenyl (p-Terphenyl) neutron detectors was obtained by means of γ-sources and a 252Cf fission chamber. The intrinsic timing resolution, the energy resolution up to 2 MeVee, and the electron-equivalent energy calibration were determined using γ-sources. The neutron time-of-flight spectrum from the spontaneous fission of 252Cf provided information on the proton energy calibration, the light output function, and the intrinsic neutron detection efficiency between 0 and 8 MeV for a threshold of 250 keV. Measurements of the latter were also performed using monoenergetic neutron beams. The applied experimental methods were cross-checked using two BC501A scintillation detectors, which were previously calibrated at the Physikalisch-Technische Bundesanstalt in Braunschweig, Germany. Results were compared to Monte-Carlo simulations performed using NRESP7 and NEFF7 codes.

  9. Measurement uncertainty evaluation of a hexapod-structured calibration device for multi-component force and moment sensors

    NASA Astrophysics Data System (ADS)

    Nitsche, J.; Baumgarten, S.; Petz, M.; Röske, D.; Kumme, R.; Tutsch, R.

    2017-04-01

    As a reference measurement machine for multi-component force and moment sensors of up to six components, a hexapod-structured calibration device was developed at the Physikalisch-Technische Bundesanstalt in 2001. The machine can generate and measure forces of up to 10 kN and moments of up to 1 kN · m. In this paper, the measurement uncertainty budget of the machine is analyzed, beginning with an improved physical model and calculation of sensitivity coefficients using the implicit function theorem and the Monte Carlo method. The main influencing factors for the measurement uncertainty are discussed and suggestions for further reduction of the uncertainty are given.

  10. Investigation of Periodic Nuclear Decay Data with Spectral Analysis Techniques

    NASA Astrophysics Data System (ADS)

    Javorsek, D.; Sturrock, P.; Buncher, J.; Fischbach, E.; Gruenwald, T.; Hoft, A.; Horan, T.; Jenkins, J.; Kerford, J.; Lee, R.; Mattes, J.; Morris, D.; Mudry, R.; Newport, J.; Petrelli, M.; Silver, M.; Stewart, C.; Terry, B.; Willenberg, H.

    2009-12-01

    We provide the results from a spectral analysis of nuclear decay experiments displaying unexplained periodic fluctuations. The analyzed data was from 56Mn decay reported by the Children's Nutrition Research Center in Houston, 32Si decay reported by an experiment performed at the Brookhaven National Laboratory, and 226Ra decay reported by an experiment performed at the Physikalisch-Technische-Bundesanstalt in Germany. All three data sets possess the same primary frequency mode consisting of an annual period. Additionally a spectral comparison of the local ambient temperature, atmospheric pressure, relative humidity, Earth-Sun distance, and the plasma speed and latitude of the heliospheric current sheet (HCS) was performed. Following analysis of these six possible causal factors, their reciprocals, and their linear combinations, a possible link between nuclear decay rate fluctuations and the linear combination of the HCS latitude and 1/R motivates searching for a possible mechanism with such properties.

  11. Measuring and interpreting X-ray fluorescence from planetary surfaces.

    PubMed

    Owens, Alan; Beckhoff, Burkhard; Fraser, George; Kolbe, Michael; Krumrey, Michael; Mantero, Alfonso; Mantler, Michael; Peacock, Anthony; Pia, Maria-Grazia; Pullan, Derek; Schneider, Uwe G; Ulm, Gerhard

    2008-11-15

    As part of a comprehensive study of X-ray emission from planetary surfaces and in particular the planet Mercury, we have measured fluorescent radiation from a number of planetary analog rock samples using monochromatized synchrotron radiation provided by the BESSY II electron storage ring. The experiments were carried out using a purpose built X-ray fluorescence (XRF) spectrometer chamber developed by the Physikalisch-Technische Bundesanstalt, Germany's national metrology institute. The XRF instrumentation is absolutely calibrated and allows for reference-free quantitation of rock sample composition, taking into account secondary photon- and electron-induced enhancement effects. The fluorescence data, in turn, have been used to validate a planetary fluorescence simulation tool based on the GEANT4 transport code. This simulation can be used as a mission analysis tool to predict the time-dependent orbital XRF spectral distributions from planetary surfaces throughout the mapping phase.

  12. Digitalisierung des Bösen: Energiewirtschaft als Cyberopfer

    NASA Astrophysics Data System (ADS)

    Bartsch, Michael; Frey, Stefanie

    Die Energieversorgung ist eine kritische Infrastruktur, da alle anderen Sektoren von der Stromversorgung abhängig sind und eine Störung katastrophale Auswirkungen mit unvorhersehbaren Kaskadeneffekten mit sich bringen würde. Das oberste Ziel der Betreiber ist daher sicherzustellen, dass Maßnahmen für eine störungsfreie Stromversorgung ergriffen werden. Cyberangriffe stellen ein hohes Risiko für die Energieversorgung dar. Dabei kann die Energiewirtschaft von Massenphänomenen wie Cybercrime betroffen sein, aber auch Gegenstand von technisch komplexer Cybersabotage werden, wie bei dem Angriff Ende 2015 auf einen ukrainischen Energieversorger. Die Stromversorgung fiel für mehrere Stunden aus und hatte weitreichende Auswirkungen für die Bevölkerung und Unternehmen.

  13. Final Report on the Key Comparison CCM.P-K4.2012 in Absolute Pressure from 1 Pa to 10 kPa.

    PubMed

    Ricker, Jacob; Hendricks, Jay; Bock, Thomas; Dominik, Pražák; Kobata, Tokihiko; Torres, Jorge; Sadkovskaya, Irina

    2017-01-01

    The report summarizes the Consultative Committee for Mass (CCM) key comparison CCM.P-K4.2012 for absolute pressure spanning the range of 1 Pa to 10 000 Pa. The comparison was carried out at six National Metrology Institutes (NMIs), including National Institute of Standards and Technology (NIST), Physikalisch-Technische Bundesanstalt (PTB), Czech Metrology Institute (CMI), National Metrology Institute of Japan (NMIJ), Centro Nacional de Metrología (CENAM), and DI Mendeleyev Institute for Metrology (VNIIM). The comparison was made via a calibrated transfer standard measured at each of the NMIs facilities using their laboratory standard during the period May 2012 to September 2013. The transfer package constructed for this comparison preformed as designed and provided a stable artifact to compare laboratory standards. Overall the participants were found to be statistically equivalent to the key comparison reference value.

  14. Compact extreme ultraviolet reflectometer for the characterization of grazing incidence optics based on a gas discharge light source

    SciTech Connect

    Bergmann, Klaus; Rosier, Oliver; Metzmacher, Christof

    2005-04-01

    A grazing incidence reflectometer operating in the extreme ultraviolet (EUV) spectral range around 13.5 nm is presented which is making use of a compact xenon pinch plasma light source. The apparatus allows for measuring the absolute reflectivity of a sample for grazing incidence angle in the range from typically 5 deg. to 35 deg. by comparing the EUV diode signal for the reflected light and a reference diode with an accuracy of better than 2%. Design criteria for proper matching of diode apertures and distances with respect to the spatially extended plasma source are presented. The absolute accuracy has been checked by investigating a ruthenium sample with low roughness, which has a reflectivity in the EUV close to the theoretical limit. Comparison to measurements at the EUV-reflectometer of the Physikalisch Technische Bundesanstalt in Berlin at a synchrotron source confirm the absolute accuracy of better than 2% for the reflectivity for the angle interval of interest.

  15. An analysis of type F2 software measurement standards for profile surface texture parameters

    NASA Astrophysics Data System (ADS)

    Todhunter, L. D.; Leach, R. K.; Lawes, S. D. A.; Blateyron, F.

    2017-06-01

    This paper reports on an in-depth analysis of ISO 5436 part 2 type F2 reference software for the calculation of profile surface texture parameters that has been performed on the input, implementation and output results of the reference software developed by the National Physical Laboratory (NPL), the National Institute of Standards and Technology (NIST) and Physikalisch-Technische Bundesanstalt (PTB). Surface texture parameters have been calculated for a selection of 17 test data files obtained from the type F1 reference data sets on offer from NPL and NIST. The surface texture parameter calculation results show some disagreements between the software methods of the National Metrology Institutes. These disagreements have been investigated further, and some potential explanations are given.

  16. Integration of a silicon-based microprobe into a gear measuring instrument for accurate measurement of micro gears

    NASA Astrophysics Data System (ADS)

    Ferreira, N.; Krah, T.; Jeong, D. C.; Metz, D.; Kniel, K.; Dietzel, A.; Büttgenbach, S.; Härtig, F.

    2014-06-01

    The integration of silicon micro probing systems into conventional gear measuring instruments (GMIs) allows fully automated measurements of external involute micro spur gears of normal modules smaller than 1 mm. This system, based on a silicon microprobe, has been developed and manufactured at the Institute for Microtechnology of the Technische Universität Braunschweig. The microprobe consists of a silicon sensor element and a stylus which is oriented perpendicularly to the sensor. The sensor is fabricated by means of silicon bulk micromachining. Its small dimensions of 6.5 mm × 6.5 mm allow compact mounting in a cartridge to facilitate the integration into a GMI. In this way, tactile measurements of 3D microstructures can be realized. To enable three-dimensional measurements with marginal forces, four Wheatstone bridges are built with diffused piezoresistors on the membrane of the sensor. On the reverse of the membrane, the stylus is glued perpendicularly to the sensor on a boss to transmit the probing forces to the sensor element during measurements. Sphere diameters smaller than 300 µm and shaft lengths of 5 mm as well as measurement forces from 10 µN enable the measurements of 3D microstructures. Such micro probing systems can be integrated into universal coordinate measuring machines and also into GMIs to extend their field of application. Practical measurements were carried out at the Physikalisch-Technische Bundesanstalt by qualifying the microprobes on a calibrated reference sphere to determine their sensitivity and their physical dimensions in volume. Following that, profile and helix measurements were carried out on a gear measurement standard with a module of 1 mm. The comparison of the measurements shows good agreement between the measurement values and the calibrated values. This result is a promising basis for the realization of smaller probe diameters for the tactile measurement of micro gears with smaller modules.

  17. Report on the 6th scientific meeting of the "Verein zur Förderung des Wissenschaftlichen Nachwuchses in der Neurologie" (NEUROWIND e.V.) held in Motzen, Germany, Oct. 31th - Nov. 2nd, 2014.

    PubMed

    Kleinschnitz, Christoph; Linker, Ralf A; Magnus, Tim; Korn, Thomas; Meuth, Sven G

    2015-01-01

    From October 31th - November 2nd, 2014, the 6th NEUROWIND e.V. meeting was held in Motzen, Brandenburg, Germany. 70 doctoral students and postdocs from over 25 different groups working in German and Swiss university hospitals or research institutes attended the meeting to discuss their latest experiments and findings in the fields of neuroimmunology, neurodegeneration and neurovascular research. The meeting was regarded as a very well organized platform to support research of young investigators in Germany and all participants enjoyed the stimulating environment for lively in depth discussions. According to the major aim of NEUROWIND e.V. to support younger researchers in Germany the 4th NEUROWIND YOUNG SCIENTIST AWARD for experimental neurology was awarded to Michael Breckwoldt on his work in the group of Thomas Misgeld (Institute of Neuronal Cell Biology, Technische Universität München, Germany). The successful project was published in Nature Medicine entitled "Multiparametric optical analysis of mitochondrial redox signals during neuronal physiology and pathology in vivo". This outstanding paper deals with a molecular imaging approach in living mice to optically analyze the role of mitochondrial redox signals in axons in health and disease. The award is endowed with 20.000 Euro sponsored by Merck Serono GmbH, Darmstadt, Germany (unrestricted educational grant). This year's keynote lecture was given by Bernhard Hemmer, Head of the Department of Neurology at the Klinikum rechts der Isar, Technische Universität München. Dr. Hemmer highlighted the particular role of B cells and (auto)antibodies in multiple sclerosis (MS). As a new highlight Dr. Urbahns, head of global discovery technologies at Merck research laboratories, gave insights from research practice in the pharmaceutical industry and introduced a shift in the view on present-day drug discovery paradigms.

  18. Long-range nanopositioning and nanomeasuring machine for application to micro- and nanotechnology

    NASA Astrophysics Data System (ADS)

    Jäger, Gerd; Hausotte, Tino; Büchner, Hans-Joachim; Manske, Eberhard; Schmidt, Ingomar; Mastylo, Rostyslav

    2006-03-01

    The paper describes the operation of a high-precision long range three-dimensional nanopositioning and nanomeasuring machine (NPM-Machine). The NPM-Machine has been developed by the Institute of Process Measurement and Sensor Technology of the Technische Universität Ilmenau. The machine was successfully tested and continually improved in the last few years. The machines are operating successfully in several German and foreign research institutes including the Physikalisch-Technische Bundesanstalt (PTB). Three plane mirror miniature interferometers are installed into the NPM-machine having a resolution of less than 0,1 nm over the entire positioning and measuring range of 25 mm x 25 mm x 5 mm. An Abbe offset-free design of the three miniature plane mirror interferometers and applying a new concept for compensating systematic errors resulting from mechanical guide systems provide extraordinary accuracy with an expanded uncertainty of only 5 - 10 nm. The integration of several, optical and tactile probe systems and nanotools makes the NPM-Machine suitable for various tasks, such as large-area scanning probe microscopy, mask and wafer inspection, nanostructuring, biotechnology and genetic engineering as well as measuring mechanical precision workpieces, precision treatment and for engineering new material. Various developed probe systems have been integrated into the NPM-Machine. The measurement results of a focus sensor, metrological AFM, white light sensor, tactile stylus probe and of a 3D-micro-touch-probe are presented. Single beam-, double beam- and triple beam interferometers built in the NPM-Machine for six degrees of freedom measurements are described.

  19. A single standardized practical training for surgical scrubbing according to EN1500: effect quantification, value of the standardized method and comparison with clinical reference groups.

    PubMed

    Fichtner, Andreas; Haupt, Elke; Karwath, Tobias; Wullenk, Katharina; Pöhlmann, Christoph; Jatzwauk, Lutz

    2013-01-01

    Die standardisierte Schulung klinisch-praktischer Fertigkeiten in sog. Skills Labs ist erst seit wenigen Jahren an deutschen Universitäten verbreitet. Den zumeist umfangreichen und sehr guten Evaluationsergebnissen stehen kaum Untersuchungen zur Effektquantifizierung und Kosten-Nutzen-Analyse gegenüber. In der vorliegenden Studie soll eine Methode zur digitalen Quantifizierung der Güte der chirurgischen Händedesinfektion vorgestellt werden sowie das Skills-Lab-Training der standardisierten Einreibemethode nach EN1500 auf seinen Effekt hin untersucht und mit OP-Pflegepersonal und Operateuren als klinische Referenzgruppen verglichen werden.Methode: 161 Studierende der Medizin eines 8. Semesters wurden in Kontroll- und Interventionsgruppe randomisiert. Die Interventionsgruppe erhielt ein 45-minütiges standardisiertes Training durch geschulte Mitstudierende zum Verhalten im OP mit dem Teilaspekt der chirurgischen Händedesinfektion nach EN1500. Dem Desinfektionsmittel wurde Fluoreszenzfarbstoff beigemischt. Nach der Desinfektion wurden die 4 Handflächen eines jeden Probanden digital fotografiert und teilautomatisiert die nicht ausreichend benetzte Handfläche bestimmt. Die Ergebnisse aller studentischer Probanden wurden verglichen, sowie das Kompetenzniveau anhand zweier klinischer Referenzgruppen eingeordnet.Ergebnisse: Die Interventionsgruppe erreichte nach dem studentisch angeleiteten Training eine zu durchschnittlich 4,99% (SD 2,34) der gesamten vier Handflächen nicht sicher ausreichende Benetzung und war damit hoch signifikant (p<0,01) besser als die Kontrollgruppe mit 7,33% (SD 3,91). Im Vergleich zu den Referenzgruppen konnte in der Kontrollgruppe kein signifikanter Unterschied gezeigt werden, die Interventionsgruppe zeigte aber im Vergleich zu beiden Referenzgruppen hoch signifikant bessere Ergebnisse: Operateure 9,32% (SD 4,97), OP-Pflege 8,46% (SD 4,66). Der Methodenfehler ist vernachlässigbar gering. In der Subgruppenanalyse hinsichtlich der

  20. Evaluation in medical education: A topical review of target parameters, data collection tools and confounding factors.

    PubMed

    Schiekirka, Sarah; Feufel, Markus A; Herrmann-Lingen, Christoph; Raupach, Tobias

    2015-01-01

    Hintergrund und Fragestellung: Die Evaluation ist fester Bestandteil der Lehre an Medizinischen Fakultäten. Gemäß den Standards der Deutschen Gesellschaft für Evaluation müssen Evaluationsinstrumente eine faire und genaue Beurteilung der Lehrqualität erlauben. Entsprechend müssen die genutzten Erhebungsinstrumente eine hohe Reliabilität und Validität aufweisen. In dieser Übersichtsarbeit wird die verfügbare Literatur zur Evaluation des Medizinstudiums mit Hinblick auf die möglichen Dimensionen der Lehrqualität, die psychometrischen Eigenschaften der Instrumente und potentielle Störfaktoren dargestellt.Methoden: Ausgehend von einer Schlagwortsuche in Pubmed, PsycINFO und PSYNDEX wurde eine Literatur-Recherche zur Evaluation im Medizinstudium durchgeführt. Berücksichtigung fanden Arbeiten, die bis zum 30.6.2011 in die Datenbanken aufgenommen wurden sowie „graue Literatur“. Die Ergebnisse werden in narrativer Form präsentiert.Ergebnisse: Es wurden vier Dimensionen der Lehrqualität im Medizinstudium identifiziert: Strukturen, Prozesse, Dozenten-Charakteristika und das Lehr-Ergebnis. Zur Betrachtung der ersten drei Dimensionen werden in erster Linie studentische Bewertungen herangezogen. Hierfür liegen einige reliable, in deutscher Sprache verfügbare Instrumente vor. Die Validität studentischer Bewertungen wird jedoch durch zahlreiche potentielle Störfaktoren eingeschränkt. Zur Beurteilung des Lehr-Ergebnisses werden vor allem Prüfungsleistungen herangezogen, deren Nutzbarkeit allerdings aufgrund methodischer Probleme eingeschränkt sein kann. Zudem genügen nicht alle Prüfungen an deutschen medizinischen Fakultäten den gängigen Qualitätsstandards.Folgerung: Die Auswahl von Instrumenten zur Evaluation des Medizinstudiums sollte sich daran orientieren, welche Dimension der Lehre beurteilt werden soll. Entsprechend können Evaluationsergebnisse auch nur vor dem Hintergrund des vom genutzten Erhebungsinstrument abgebildeten Konstrukts und

  1. The Final Oral/Practical State Examination at Freiburg Medical Faculty in 2012--Analysis of grading to test quality assurance.

    PubMed

    Schickler, Angela; Brüstle, Peter; Biller, Silke

    2015-01-01

    Zielsetzung: Von der Medizinischen Fakultät Freiburg werden verschiedene Maßnahmen zur Qualitätssicherung des mündlich-praktischen Teils des Zweiten Abschnitts der Ärztlichen Prüfung (M2) betrieben. Insbesondere werden die Prüfenden in einem Baden-Württemberg-weit standardisierten M2-Prüferworkshop fortgebildet.Ziel der vorliegenden Studie war es die Notenvergabe zu analysieren. Es wurde geprüft, welcher Zusammenhang zwischen der schriftlichen und der mündlich-praktischen Notenvergabe besteht und ob sich ein Unterschied in der Notenvergabe zwischen Universitätsklinikum (UKL) und den Akademischen Lehrkrankenhäusern (ALKs) findet. Darüber hinaus wurde untersucht, ob sich die Notenvergabe von fortgebildeten und nicht fortgebildeten Prüfenden unterscheidet und inwieweit diese Unterschiede sich im zeitlichen Abstand zum Workshop verändern. Methodik: Die analysierte Stichprobe (N=315) umfasst die Frühjahrs- und Herbstprüfungskohorte 2012. Der Datensatz wurde vom Landesprüfungsamt zur Verfügung gestellt und mittels deskriptiver und Inferenzstatistik ausgewertet.Ergebnisse: Zwischen der schriftlichen und mündlich-praktischen M2-Prüfungsnote konnte ein Zusammenhang von ρ=0,460** ermittelt werden. Es konnte kein signifikanter Unterschied in der Verteilung der Noten zwischen UKL und den ALKs festgestellt werden. Die Daten zu den Variablen fortgebildete versus nicht fortgebildete Prüfende zeigen, dass Prüfende mit Absolvierung eines Prüferworkshops seltener die Note „sehr gut“ sowie ein breiteres Notenspektrum vergeben. In der Verteilung der Noten zeigt sich ein signifikanter Unterschied (p=0,007, phi=0,165). Dieses Ergebnis wird deutlicher bei Betrachtung von Prüfenden, deren Workshopteilnahme nicht länger als ein Jahr zurücklag. Schlussfolgerungen: Die Ergebnisse der Analyse weisen darauf hin, dass der Prüferworkshop an der Medizinischen Fakultät Freiburg eine wirksame Qualitätssicherungsmaßnahme ist. Die Ergebnisse lassen den Schluss zu

  2. Evaluation der zentralen TUM-Lernplattform

    NASA Astrophysics Data System (ADS)

    Schulze, Elvira; Baume, Matthias; Graf, Stephan; Gergintchev, Ivan

    Die Notwendigkeit der Qualitätssicherung und -kontrolle für innovative universitäre Lehr-/Lernszenarien ist in der Praxis unbestritten. Die Wirksamkeit der Einführung der zentralen Lernplattform CLIX Campus der imc AG an der TUM wurde mittels quantitativer und qualitativer Evaluation überprüft. Als statistische Bewertungsgrundlage wurde der Erreichungsgrad bestimmter Projektziele herangezogen. Aufbauend auf den theoretischen Grundlagen der Evaluation von Bildungsangeboten gibt diese Studie Aufschluss über die Ergebnisse der Datenerhebungen sowie die Einschätzung der Plattform aus Nutzersicht und belegt die wesentliche Bedeutung der durchgängigen IT-Infrastruktur und speziell der einheitlichen Verfügbarkeit der eLearning Angebote.

  3. Schlüsselkomponenten für Roboter in der Produktion Roboterhaut und Sicherheitskonzept für die Mensch-Roboter Kooperation

    NASA Astrophysics Data System (ADS)

    Denkena, B.; Hesse, P.; Friederichs, J.; Wedler, A.

    Vorgestellt wird der Aufbau einer aktiven Sensor-Matrix zur Abstands- und Kontaktdetektion in der Robotik. Diese besteht aus einem Sensornetzwerk zur Fusion und Überlagerung differenter physikalischer Wirkprinzipien. Die Sicherheit der I2C-Bus Kommunikation, der Aufbau der Roboterhaut, Ergebnisse der Abstandsdetektion mit Infrarot-, und Ultraschallsensorik werden dargestellt. Ferner wurden Temperatur-, und Beschleunigungssensoren auf die Oberfläche der Roboterhaut aufgebracht um Informationen über die Umgebung sicher an ein übergeordnetes Leitsystem zu übertragen. Eine unterlagerte sichere Roboterhaut mit Kontaktdetektion zeigt als einfache Schlüsselkomponente ein analoges Ausschaltverhalten für geringe Latenzzeiten. Als Schluss wird auf den Einsatz an einem Industrieroboter in der Produktion ohne trennende Schutzeinrichtungen (OTS) eingegangen.

  4. [Educational competence of parents with children participating in youth welfare measures].

    PubMed

    Rücker, Stefan; Büttner, Peter; Petermann, Ulrike; Petermann, Franz

    2013-07-01

    Fragestellung: In der vorliegenden Studie wird der Einfluss ausgewählter Risiken auf das Erziehungsverhalten von Eltern am Beginn einer Jugendhilfe-Maßnahme analysiert. Methodik: Familiäre Belastungen sowie Erziehungsdimensionen wurden anhand standardisierter Erhebungsverfahren bei N = 74 Eltern erfasst. Ergebnisse: In Abhängigkeit des Belastungsausmaßes konnten drei Gruppen gebildet werden. Die Befragungsergebnisse wurden im Querschnitt varianzanalytisch ausgewertet. Familien mit spezifischen Risiken, wie materielle Belastungen, psychisch erkrankte Elternteile oder einen Alleinerziehendenstatus weisen signifikant ungünstigere Werte bei Erziehungsmerkmalen auf. In negativen Erziehungsmerkmalen kann der Einfluss spezifischer Risiken statistisch nicht abgesichert werden. Schlussfolgerungen: Spezifisch belastete Eltern in Jugendhilfe-Maßnahmen benötigen eventuell ein spezielles Training zur Steigerung ihrer Erziehungskompetenz. Dies gilt vor allem dann, wenn Prä-Post-Vergleiche am Ende der Maßnahme ein geringeres Erziehungs-Outcome in der spezifisch belasteten Gruppe offenbaren.

  5. [MBA - The Physician of Tomorrow?

    PubMed

    Bork, U; Welsch, T; Weitz, J

    2015-12-01

    In den letzten zehn Jahren hat sich das deutsche Gesundheitssystem zunehmend gewandelt. Kliniken stehen unter deutlichem ökonomischen Druck und betriebswirtschaftliches Wissen wird auch für Mediziner immer wichtiger, auch um mit der Klinikverwaltung optimal im Sinne der Patienten zusammenarbeiten zu können. Medizin und Ökonomie stehen hierbei nicht im Widerspruch zueinander. Durch effizientere Leitung einer Abteilung lassen sich häufig Ressourcen einsparen, Prozessabläufe besser gestalten und auch für den Patienten vorteilhafte Ergebnisse bezüglich Service und medizinischer Qualität erzielen.In den letzten Jahren hat das Angebot an ökonomischen und betriebswirtschaftlichen Zusatzstudiengängen und Weiterbildungsangeboten für Mediziner stetig zugenommen und wird im Folgenden beleuchtet.

  6. Über die Kleinsignalgewinnmessung nach Ladenburg-Levy

    NASA Astrophysics Data System (ADS)

    Grunwald, R.; Hertz, J. H.

    Es werden die Möglichkeiten und Probleme der Anwendung einer alten Methode von Ladenburg-Levy zur Kleinsignalgewinnmessung in Niederdruck-Impulsgasentladungen diskutiert. Als Beispiel werden Ergebnisse der zeitaufgelösten Gewinnmessung am 2. Pos. System des Stickstoff ( = 337 nm) mitgeteilt.Translated AbstractOn the Small-Signal Gain Measurement According to Ladenburg-LevyThe application of an old method of Ladenburg-Levy to small-signal gain measurement in pulsed low pressure gas discharges as well as the problems connected with this method are discussed. As an example experimental results of time resolved gain measurements in the 2nd positive system of nitrogen ( = 337 nm) are presented.

  7. INTEGRAL entdeckt den Gamma-Himmel: Gamma-Astronomie

    NASA Astrophysics Data System (ADS)

    Schönfelder, Volker

    2004-11-01

    Das Gamma-Weltraumteleskop INTEGRAL der Europäischen Weltraumbehörde, ESA, hat in den ersten 15 Monaten seiner Mission eine Fülle interessanter, neuer Ergebnisse geliefert. Hauptinstrumente an Bord sind das hoch auflösende Spektrometer SPI und das Spektrometer IBIS. Hinzu kommt je ein Monitor für den Röntgen- und optischen Bereich. Die wichtigsten neuen Erkenntnisse stammen vor allem aus dem Bereich harter kompakter Röntgenquellen und aus dem Bereich der Gammalinien-Spektroskopie. Mit INTEGRAL wurde es erstmals möglich, den diffusen galaktischen Hintergrund zum Teil mit Einzelquellen identifizieren zu können. Ferner ließ sich in der Umgebung des galaktischen Zentrums die 511-keV-Linie von annihilierenden Positronen und Elektronen nachweisen. Schließlich trägt INTEGRAL auch entscheidend zum Studium der geheimnisvollen Gamma Ray Bursts bei.

  8. Reduktion der Invasivität bei nadelbasierter Bewegungskompensation für navigierte Eingriffe im Abdomen

    NASA Astrophysics Data System (ADS)

    Maier-Hein, L.; Tekbas, A.; Franz, A. M.; Tetzlaff, R.; Müller, S. A.; Pianka, F.; Wolf, I.; Kauczor, H.-U.; Schmied, B. M.; Meinzer, H.-P.

    Diese Arbeit stellt eine in-vivo Genauigkeitsstudie über das Kombinieren interner und externer Marker für die Bewegungskompensation bei Leberinterventionen vor. Abhängig von der Anzahl und Anordnung der verwendeten Marker sowie der angewandten Echtzeittransformation wurde bei kontinuierlicher Atmung eine Schätzgenauigkeit der Zielposition zwischen 1 und 5 mm erreicht. Das Hinzufügen einer einzigen Hilfsnadel zu einer Menge von Hautmarkern führte zu einer Fehlerreduktion von über 50%. Die Ergebnisse dieser Studie können in der Praxis verwendet werden, um basierend auf dem Tradeoff zwischen geringer Invasivität und hoher Genauigkeit eine geeignete Kombination von internen und externen Markern für eine gegebene Fragestellung zu wählen.

  9. Methodik und Qualität statistischer Erhebungen

    NASA Astrophysics Data System (ADS)

    Krug, Walter; Schmidt, Jürgen; Wiegert, Rolf

    Kapitel 8 wirft einen Blick hinter die Kulissen statistischer Arbeit und ihrer Methoden, insbesondere auch hinter die der amtlichen Statistik: Wie kommen die Myriaden von Zahlen zustande, die heute aus statistischen Quellenwerken aller Art und aus Datenbanken abgerufen werden können? Dabei wird deutlich, welche Schwierigkeiten bei Erhebungen, insbesondere bei Stichprobenerhebungen, zu überwinden sind, wie man Antwortverweigerer kooperativer stimmt, wie sich auch aus kleinen Stichproben auf intelligente Weise verlässliche Ergebnisse erzielen lassen und wie Großstichproben auf europäischer Ebene harmonisiert werden. Am Beispiel des Zensus 2011 wird gezeigt, wie sich eine Kombination von Stichproben und Registerauswertungen als Ersatz für eine Volkszählung nutzen lässt. Mitglieder der Deutschen Statistischen Gesellschaft waren daran kooperativ beteiligt.

  10. Ein Organic Computing Ansatz zur Steuerung einer sechsbeinigen Laufmaschine

    NASA Astrophysics Data System (ADS)

    Auf, Adam El Sayed; Larionova, Svetlana; Mösch, Florian; Litza, Marek; Jakimovski, Bojan; Maehle, Erik

    Obwohl die Rechengeschwindigkeit von Computern und die Komplexität unserer Systeme ständig zunimmt, sind die heutigen Laufmaschinen nicht in der Lage, sich mit den Fähigkeiten von Landtieren wie zum Beispiel Insekten zu messen. Das Verständnis biologischer Konzepte und das Lernen von der Natur könnten zur Verbesserung der heutigen Maschinen beitragen und sie ein wenig “lebensähnlicher“ machen. Dieser Artikel stellt einen Kontrollarchitekturansatz basierend auf “Organic Computing“-Prinzipien vor, der die Nutzung von Dezentralisierung und Selbstorganisation an einer sechsbeinigen Laufmaschine demonstriert. Die vorliegende Arbeit erklärt die elementaren Mechanismen für das gerade Laufen, das Kurvenlaufen sowie das Drehen auf der Stelle und den Umgang mit strukturellen körperlichen Änderungen wie einer Beinamputation und stellt die Ergebnisse experimenteller Versuche vor.

  11. Netzgenerierung und Finite-Elemente-Simulation muskulärer Strukturen unter Beachtung korrespondierender histologischer Schnittpräparate

    NASA Astrophysics Data System (ADS)

    Weichert, Frank; Schröder, Andreas; Landes, Constantin; Walczak, Lars; Müller, Heinrich; Wagner, Mathias

    In dieser Arbeit wird ein Verfahren zur Netzgenerierung und Finite-Elemente-Simulation muskulärer Strukturen vorgestellt. Eine Herausforderung liegt dabei in der Fusion der Simulationsergebnisse mit den Daten histologischer Schnittpräparate. Basierend auf segmentierten histologischen Daten wird eine Rekonstruktion der relevanten muskulären Strukturen mittels eines BCC-Tetraedernetzes initiiert. Dieses wird getriggert über einen Level-Set-Ansatz. Die Deformation des Muskels wird dann mittels eines hyperelastischen Materialgesetzes modelliert und mithilfe der Finite-Elemente-Methode simuliert. Anschließend erfolgt eine Projektion der Ergebnisse der Simulation auf die histologischen Schnittpräparate. Als Anwendungsfall wurden Daten abortiver Feten mit einer Spaltbildung im Bereich der Lippen-, Kiefer- und Gaumenregion herangezogen.

  12. [A 100 year old thesis. Amanuensis Hans Christian Geelmuyden].

    PubMed

    Bremer, J

    1997-12-10

    Hans Christian Geelmuyden (1861-1945) was amanuensis (assistant professor) at the Institute of Physiology, University of Oslo from 1889 to 1931. In 1897 he was awarded the degree "Doctor of Medicine" for his thesis "Om aceton som stofvexelprodukt" (On acetone as a metabolic product). The Nobel laureate Feodor Lynen referred to this thesis, which was also published in German, stating that Geelmuyden was the first to establish that ketone bodies are formed from fatty acids. Geelmuyden also established that acetone is metabolized in rabbits and dogs. Geelmuyden was a prolific writer on fat metabolism and diabetes and wrote a series of extensive reviews on these topics in Ergebnisse der Physiologie. Geelmuyden was active in the treatment of diabetic patients.

  13. Investigation of coagulation and serum biochemistry profiles in dairy cattle with different degrees of fatty liver.

    PubMed

    Gerspach, C; Ruetten, M; Riond, B

    2016-12-01

    Das Ziel der vorliegenden Arbeit war es, Blutgerinnungsprofile, biochemische und hämatologische Parameter bei Kühen mit unterschiedlichen Schweregraden der Leberverfettung zu untersuchen. Der Schweregrad der Leberverfettung wurde mittels histologischer Untersuchung von Leberbiopsien ermittelt. Fünfzig Kühe, die wegen linksseitiger Labmagenverlagerung überwiesen wurden und verschiedene Schweregrade einer Leberverfettung aufwiesen wurden untersucht. Ein Gerinnungsprofil einschliesslich Prothrombinzeit, Thrombinzeit, partieller Thromboplastinzeit und Fibrinogen konnte nicht zwischen Kühen mit oder ohne Leberverfettung unterscheiden. Die Aspartat Aminotransferase (ASAT) war der einzige Parameter, der bei Kühen mit Leberverfettung signifikant verändert war, jedoch nicht verschiedene Schweregrade der Leberverfettung unterscheiden konnte. Die Ergebnisse zeigen, dass Gerinnungsfaktoren durch eine Leberverfettung nicht beeinflusst werden. Die routinemässig gemessenen biochemischen Parameter sind nicht geeignet um den Schweregrad einer Leberverfettung bestimmen zu können.

  14. Basic practical skills teaching and learning in undergraduate medical education - a review on methodological evidence.

    PubMed

    Vogel, Daniela; Harendza, Sigrid

    2016-01-01

    Zielsetzung: Praktische Fertigkeiten sind ein wesentlicher Bestandteil des ärztlichen Arbeitsalltags. Dennoch liegt die Leistung von Absolventen eines Medizinstudiums bei der Durchführung praktischer Basisfertigkeiten häufig unter den erwarteten Anforderungen. Diese Übersichtsarbeit verfolgt daher das Ziel, Lehrmethoden für medizinische Basisfertigkeiten im Medizinstudium zu identifizieren und zusammenzufassen, die einen evidenzbasierten Nachweis für das effektive studentische Lernen dieser Fertigkeiten erbringen. Methoden: Praktische Basisfertigkeiten wurden als Basisfertigkeiten der körperlichen Untersuchung, Routinefertigkeiten, die im Laufe der Praxis besser werden, und als Fertigkeiten, die auch vom Pflegepersonal übernommen werden, definiert. PubMed wurde mit verschiedenen Begriffen durchsucht, die diese praktischen Basisfertigkeiten beschreiben. Insgesamt wurden 3467 identifizierte Publikationen gesichtet und 205 wurden schließlich auf ihre Eignung geprüft. Ergebnisse: 43 Studien, die mindestens eine praktische Basisfertigkeit, einen Vergleich zweier Gruppen von Medizinstudierenden und Wirkungen auf die studentische Leistung beinhalteten, wurden analysiert. Sieben praktische Basisfertigkeiten und 15 verschiedene Lehrmethoden konnten identifiziert werden. Die konsistentesten Ergebnisse in Bezug auf effektive Lehre und den Erwerb von praktischen Basisfertigkeiten wurden für strukturiertes Fertigkeitentraining, Feedback und selbstgesteuertes Lernen gefunden. Simulation war mit spezifischen Lehrmethoden wirksam und in mehreren Studien fanden sich keine Unterschiede in Bezug auf Lehreffekte zwischen Experten oder Peers als Lehrende. Multimedia-gestützte Instruktion zeigte bei Anwendung in geeignetem Rahmen ebenfalls positive Effekte für das Erlernen praktischer Basisfertigkeiten. Fazit: Eine Kombination von freiwilligem oder obligatorischem Selbststudium mit Multimedia-gestützten Anwendungen wie Video-Clips in Kombination mit einem strukturierten

  15. State of Digital Education Options in the areas of Medical Terminology and the History, Theory and Ethics of Medicine.

    PubMed

    Schochow, Maximilian; Steger, Florian

    2015-01-01

    Hintergrund: In Deutschland haben viele Einrichtungen für die Bereiche Geschichte, Theorie und Ethik der Medizin E-Learning-Angebote produziert, die auf unterschiedlichen Lernplattformen basieren (LMS) und spezifisch auf die jeweilige curriculare Präsenzlehre zugeschnitten sind. Bisher existieren keine validen Daten darüber, welche Einrichtungen E-Learning-Angebote bereitstellen und welche Formen des E-Learning diese anbieten.Methoden: Von den 31 deutschen Einrichtungen für Geschichte, Theorie und Ethik der Medizin, die gefragt wurden, den Fragebogen auszufüllen, haben 30 geantwortet, was einer Rücklaufquote von 97% entspricht. Die telefonische Befragung fand zwischen Juli und August 2012 statt.Ergebnisse: Der Einsatz digitaler interaktiver Lehrmaterialien, die webbasiert den Studierenden zur Verfügung gestellt werden, hat in den vergangenen Jahren eine Konjunktur an deutschen Einrichtungen für die Bereiche Geschichte, Theorie und Ethik der Medizin erfahren. Dieser Trend wird sich weiter fortsetzen, da mehr als die Hälfte (67%) der Einrichtungen ihre bisherigen E-Learning-Angebote ausbauen will. In den vergangenen Jahren sind vor allem Angebote für Medizinische Terminologie entstanden. Viele Einrichtungen möchten künftig ihre Angebote für Medizinische Terminologie weiterentwickeln. Insgesamt wurden die E-Learning-Angebote von den Studierenden sehr gut aufgenommen. 57% der Einrichtungen gaben an, dass 90-100% der Studierenden die Angebote regelmäßig nutzen.Schlussfolgerungen: Dieser Artikel diskutiert die Ergebnisse einer umfangreichen empirischen Studie über E-Learning. Er zeigt den Rahmen auf, in dem deutsche Einrichtungen vorhaben, ihre E-Learning-Optionen in der Zukunft auszuweiten. Schließlich werden spezifische Vorschläge für die Zusammenarbeit unter den Einrichtungen (nicht nur online) gemacht, deren Ziel es ist, Synergien im Bereich E-Learning zu erzeugen.

  16. Effective reprocessing of reusable dispensers for surface disinfection tissues - the devil is in the details.

    PubMed

    Kampf, Günter; Degenhardt, Stina; Lackner, Sibylle; Ostermeyer, Christiane

    2014-01-01

    Hintergrund: Kürzlich wurde berichtet, dass wiederverwendbare Tuchspender für Flächendesinfektionsmittel kontaminiert sein können, besonders mit adaptiertem Achromobacter species 3, wenn Produkte auf Basis oberflächenaktiver Wirkstoffe verwendet werden. Frisch angesetzte Lösung kann schnell rekontaminiert werden, wenn die Tuchspender nicht sachgerecht aufbereitet werden.Methode: Wir untersuchten die Wirksamkeit von sechs manuellen und drei maschinellen Aufbereitungsverfahren für kontaminierte Tuchspender mit dem Ziel, die Rekontamination der frisch angesetzten Desinfektionsmittellösung (Mikrobac forte 0,5%) zu vermeiden. Die Tuchspender wurden bei Raumtemperatur über 28 d stehen gelassen. Proben der Desinfektionsmittellösung wurden alle 7 d quantitativ auf bakterielle Kontamination untersucht.Ergebnisse: Alle maschinellen Verfahren verhinderten die Rekontamination der Desinfektionsmittellösung, wenn eine Temperatur zwischen 60–70°C über mindestens 5 min sichergestellt wurde, sowohl mit als auch ohne Zusatz chemischer Reinigungsmittel. Manuelle Aufbereitungsverfahren verhinderten die Rekontamination der Desinfektionsmittellösung, wenn heißes Wasser oder ein gründlicher Reinigungsschritt vor der Desinfektion aller Flächen mit einem alkoholischen oder sauerstoffabspaltenden Flächendesinfektionsmittel erfolgte. Andere Reinigungs- bzw. Desinfektionsverfahren einschließlich der Anwendung eines alkoholischen Flächendesinfektionsmittels verhinderte nicht die Rekontamination.Schlussfolgerungen: Die Ergebnisse zeigen, dass nicht alle Verfahren zur Aufbereitung wiederverwendbarer Tuchspender für Flächendesinfektionsmittel wirksam sind. Eine hohe Temperatur in der Reinigungsphase bzw. die Anwendung eines biofilmwirksamen Reinigers sind essentiell.

  17. Ginkgo biloba extract EGb 761® in children with ADHD.

    PubMed

    Uebel-von Sandersleben, Henrik; Rothenberger, Aribert; Albrecht, Björn; Rothenberger, L Geza; Klement, Stephan; Bock, Nathalie

    2014-09-01

    Fragestellung: Unerwünschte Arzneimittelwirkungen, fehlende Wirksamkeit und Vorurteile gegenüber herkömmlichen medikamentösen Behandlungsformen verlangen nach alternativen medizinischen Behandlungsmöglichkeiten der ADHS. Eine erfolgversprechende, bislang kaum untersuchte Möglichkeit zur Behandlung kognitiver Aspekte ist die Gabe von Ginkgo biloba. Ziel der vorliegenden Studie war die Prüfung klinischer Wirksamkeit und deren Zusammenhang mit hirnelektrischer Aktivität unter der Gabe von Ginkgobiloba-Extrakt EGb 761® bei Kindern mit ADHS vom kombinierten Subtyp nach DSM-IV. Methodik: EGb 761® wurde in einer offenen, klinischen Studie 20 Kindern mit ADHS über 3 bis 5 Wochen verabreicht. Die Dosis wurde bis maximal 240 mg täglich erhöht, solange klinisch relevante Aufmerksamkeitsprobleme bestanden. Klinische Wirksamkeit wurde auf mehreren Ebenen untersucht und beinhaltete klinische Untersuchung, Lebensqualität und Verhaltens- und hirnelektrische Aktivitätsparameter während eines Continuous Performance Tests (Cue-CNV im CPT). Ergebnisse: Im Beobachtungszeitraum traten nur wenige leicht ausgeprägte unerwünschte Wirkungen auf. Nach Gabe von EGb 761® kam es zu möglichen Verbesserung von Lebensqualität, ADHS-Kernsymptomatik und Leistung im CPT. Verbesserungen der Kernsymptomatik waren gleichzeitig mit erhöhter CNV-Amplitude korreliert. Schlussfolgerung: Die Ergebnisse lassen vermuten, dass EGb 761® mit einer Dosis von bis zu 240 mg täglich eine verträgliche und klinisch wirksame alternative Behandlungsmöglichkeit für Kinder mit ADHS darstellt, wenngleich weitere Studien erforderlich sind, um diese vorläufigen Befunde zu stützen.

  18. The Questionnaire D-RECT German: Adaptation and testtheoretical properties of an instrument for evaluation of the learning climate in medical specialist training.

    PubMed

    Iblher, Peter; Zupanic, M; Ostermann, T

    2015-01-01

    Zielsetzung: In der Arbeitsgruppe von Boor et al. [1] wurde der Fragebogen D-RECT (Dutch Residency Educational Climate Test) zur Erfassung des Lernklimas in der ärztlichen Weiterbildung entwickelt und validiert. Die deutschsprachige Version (D-RECT-German) wird in der vorliegenden Studie testtheoretisch überprüft.Fragestellung: Ist eine Replikation der Ergebnisse aus der Originalarbeit von Boor et al. als Beleg der Validität des D-RECT möglich?Methodik: Die Befragung erfolgte onlinebasiert mit dem Fragebogen D-RECT-German. Mit Item- und Reliabilitätsanalysen wurden die Kennwerte der 50 Items in 11 Subskalen sowie die interne Konsistenz (Cronbach’s α) ermittelt. Die Validitätsprüfung erfolgte mit einer konfirmatorischen Faktorenanalyse unter Verwendung eines Maximum likelihood basierten Strukturgleichungsmodells.Ergebnisse: Die Itemanalysen dieser Replikationsstudie mit 255 WBA an 17 deutschen Krankenhäusern ergaben für die Items heterogene Trennschärfen, auch die interne Konsistenz der Subskalen zeigte variable Werte für Cronbach’s α zwischen 0.57 und 0.85. In der konfirmatorischen Faktorenanalyse wiesen 6 Items standardisierte Regressionskoeffizienten <0.5 auf die vorgegebenen Dimensionen auf, von denen zwei im Konstrukt „Einstellung der betreuenden Fachärzte“ zu finden waren. Die Korrelationen der Faktoren untereinander wies mit Korrelationen von über 0.7 starke Interdependenzen zwischen den Faktoren „Supervision“, „Coaching“ und „Einstellung der betreuenden Fachärzte“ auf.Schlussfolgerungen: In der Replikationsstudie mit dem D-RECT-German für den deutschsprachigen Raum zeigten sich strukturelle Unterschiede hinsichtlich der faktoriellen Validität, so dass weitere Validierungsstudien für den internationalen Vergleich notwendig sind.

  19. [Homöopathisch-phytotherapeutische Behandlung des Reizdarmsyndroms mit Magen-Darm-Entoxin N®: Eine Anwendungsbeobachtung].

    PubMed

    Märtens, Diane; Range, Natasha; Günnewich, Nils; Gruber, Nicola; Schmidt, Stefan

    2017-01-01

    Hintergrund: In dieser Anwendungsbeobachtung wird zum ersten Mal die Behandlung des Reizdarmsyndroms (RDS) mit einem homöopathisch-phytotherapeutischen Komplexpräparat beschrieben. Methodik: Ziel der 6-wöchigen Therapie mit dem Magen-Darm-Entoxin N® war die Reduzierung der RDS-Symptomatik sowie die Verbesserung der Lebensqualität. Zielkriterien waren die Veränderungen in der Irritable Bowel Syndrome - Severity Scoring System (IBS-SSS) und der Irritable Bowel Syndrome - Quality-of-Life Scale (IBS-QoL). Die Patient/innen (N = 41; Alter 44,0 ± 15,74 Jahre) wurden zu gleichen Teilen in einer Hausarztpraxis (N = 20) und einer Heilpraktikerpraxis (N = 21) rekrutiert. Ergebnisse: Der IBS-QoL-Score verringerte sich signifikant (prä: 35,9 ± 16,3; post: 20,1 ± 13,4; t = 8,504; p < 0,001). Die Effektstärke betrug 1,34 (Cohens d). Der IBS-SSS-Score verringerte sich ebenfalls signifikant (prä: 239,4 ± 83,4; post: 123,7 ± 80,9; t = 7,825; p < 0,001) mit einer Effektstärke von d = 1,24. Die Neben- und Wechselwirkungen waren minimal und signifikante Unterschiede zwischen beiden Praxen wurden nicht gefunden. Schlussfolgerungen: Magen-Darm-Entoxin N® ist eine sichere und sinnvolle Therapieoption bei der Behandlung des RDS. Allerdings sollten randomisierte kontrollierte Studien folgen, um die Spezifizität der Ergebnisse dieser Anwendungsbeobachtung zu stützen. © 2017 S. Karger GmbH, Freiburg.

  20. [Caregivers' needs concerning mobility support of a family member with terminal cancer - a narrative review].

    PubMed

    Gattinger, Heidrun; Siegl, Eva; Senn, Beate; Hantikainen, Virpi

    2014-06-01

    Hintergrund: Die häusliche Pflege krebskranker Menschen wird häufig von Angehörigen übernommen. Die letzte Lebensphase geht in der Regel mit Einschränkungen der Bewegungsfähigkeit einher. Ziel: Ziel dieser narrativen Literaturübersicht ist es, die Bedürfnisse pflegender Angehöriger bezüglich Mobilitätsunterstützung und -förderung bei der alltäglichen Pflege des an Krebs erkrankten Familienmitgliedes am Lebensende zu erfassen. Methode: Die Literatursuche erfolgte in den Datenbanken Cochrane, PubMed, PsychINFO, ERIC und CINAHL. Eingeschlossen wurden englisch- und deutschsprachige Studien, die Bedürfnisse betreffend der Mobilitätsunterstützung und -förderung der Angehörigen hinsichtlich der häuslichen Pflege krebskranker Menschen untersuchten. Zwei Autorinnen beurteilten die methodische Qualität der eingeschlossenen Studien. Ergebnisse: Insgesamt wurden elf Studien mit unterschiedlichen Studiendesigns eingeschlossen. Die Ergebnisse zeigen, dass das Bedürfnis nach Information, Anleitung und Unterstützung betreffend Mobilität in zwei Bereichen besteht: i) Tätigkeiten des alltäglichen Lebens inklusive Körperpflege und ii) Einsatz von Hilfsmitteln inklusive Transport. Schlussfolgerung: Die Literaturanalyse zeigt, dass Bedürfnisse pflegender Angehöriger zu pflegerischen Skills bezüglich der Mobilitätsunterstützung und -förderung unzureichend und unsystematisch beschrieben sind. Zukünftige Studien sind notwendig, in denen diese Bedürfnisse systematisch untersucht werden, um darauf aufbauend gut definierte Interventionen für die Vermittlung pflegerischer Skills zu entwickeln.

  1. Blogging medical students: a qualitative analysis.

    PubMed

    Pinilla, Severin; Weckbach, Ludwig T; Alig, Stefan K; Bauer, Helen; Noerenberg, Daniel; Singer, Katharina; Tiedt, Steffen

    2013-01-01

    Einleitung: Bloggen ist eine unter Medizinstudierenden zunehmend verbreitete Methode, Erfahrungen über das Internet mit einer weltweiten „Learning Community“ auszutauschen. Trotz intensiver Recherche sind den Autoren keine Studien bekannt, in denen spezifisch Blogs von Medizinstudierenden qualitativ analysiert wurden. Im Folgenden werden Kategorien und Themen aus diesen Blogeinträgen beschrieben und ihre medizindidaktische Bedeutung für Medizinstudierende und Lehrende diskutiert.Methoden: In der vorliegenden qualitativen Studie wurden ursprünglich 75 von Medizinstudierenden verfasste Blogs identifiziert. 33 Blogs mit insgesamt 1228 englischen und 337 deutschen Einträgen erfüllten die Einschlusskriterien und wurden analysiert. Mit Hilfe einer komparativen Analysemethode wurden die Blogeinträge zunächst Zeile für Zeile und anschließend fokussiert kodiert. Die emergierenden Themen und Unterthemen wurden in übergeordneten Kategorien zusammengefasst.Ergebnisse: Medizinstudierende verwenden Blogs, um über eine große Vielfalt an Erfahrungen während des Medizinstudiums zu berichten und diese zu reflektieren. Vorbereitung auf schriftliche und mündliche Examina, Erfahrungen während klinischer Praktika, der Umgang mit belastenden Situationen während des Studiums und das Sozialleben jenseits des Studiums waren Hauptthemen.Schlussfolgerung: Unsere Ergebnisse weisen darauf hin, dass Blogs für Medizinstudierende möglicherweise hilfreich sind, um Erfahrungen zu reflektieren. Zusätzlich können Lehrende auf diesem Weg wertvolle Einblicke in die studentische Wahrnehmung der medizinischen Ausbildung erhalten.Die Bedeutung von Blogs in der medizinischen Ausbildung könnte durch gezieltes Kommentieren von Blogeinträgen durch Lehrende erhöht werden. Von diesem Dialog könnte auch eine örtlich unabhängige „Learning Community“ profitieren.

  2. [The role of the family in childhood and adolescent binge eating - a systematic review].

    PubMed

    Tetzlaff, Anne; Hilbert, Anja

    2014-01-01

    Fragestellung: Während der Einfluss der Familie bei Anorexia Nervosa und Bulimia Nervosa im Kindes- und Jugendalter belegt ist und bereits in Übersichtsarbeiten zusammengefasst wurde, liegen derzeit wenige Befunde zum Zusammenhang zu Essanfällen ohne kompensatorische Verhaltensweisen vor. Ziel dieser systematischen Übersichtsarbeit ist es daher, familiäre Einflussfaktoren auf die Entstehung und Aufrechterhaltung von Essanfällen zu beschreiben. Methodik: Eine systematische Datenbanksuche für Studien zum Zusammenhang von familiären Faktoren und Essanfällen wurde durchgeführt. Ergebnisse: Die eingeschlossenen Studien zeigten einheitlich, dass eine unsichere Bindung des Kindes, eine geringere Familienfunktionalität und geringere emotionale Unterstützung mit Essanfällen querschnittlich assoziiert sind, elterliche Arbeitslosigkeit sowie elterliche Depressionen retrospektive Korrelate darstellen und weniger Familienmahlzeiten und häufige kritische Kommentare über Figur und Gewicht innerhalb der Familie variable Risikofaktoren für Essanfälle sind. Inkonsistente Befunde fanden sich hingegen bezüglich der Familienstrukturen, dem Vorliegen elterlicher Essstörungen und Diäthalten sowie dem Erkennen von Essanfällen beim eigenen Kind. Geschlechterunterschiede hinsichtlich familiärer Beziehungen und gewichtsbezogener Stigmatisierung wurden identifiziert. Schlussfolgerungen: Ebenso wie bei anderen Essstörungen im Kindes- und Jugendalter spielen familiäre Einflussfaktoren auch bei Essanfällen eine wichtige Rolle. Daher könnten eine Diagnostik familiärer Einflüsse und familientherapeutische Interventionen in der Behandlung von Essanfällen im Kindes- und Jugendalter hilfreich sein. Mithilfe von prospektiven Studiendesigns könnten die divergierenden Ergebnisse aufgeklärt werden.

  3. [Struggling for normal in an instable situation - informal caregivers self-management in palliative home care. A meta-synthesis].

    PubMed

    Kreyer, Christiane; Pleschberger, Sabine

    2014-10-01

    Hintergrund: Die Betreuung und Pflege von Menschen mit Krebserkrankung am Lebensende zu Hause wird zu einem großen Teil in der Familie geleistet. Dabei sind vor allem pflegende Angehörige stark belastet. Studien die sich mit der Perspektive der Familien in dieser Situation beschäftigen, gehen häufig indirekt auf Selbstmanagementstrategien ein. Diese könnten ein wichtiger Ansatzpunkt für Unterstützungsangebote sein. Ziel: Ziel der Studie ist es, qualitative Forschungsergebnisse zum Selbstmanagement von Familien in der Palliative Care zu Hause zu synthetisieren. Es soll dargestellt werden, wie Familien die Situation erleben und welche Selbstmanagementstrategien sie nutzen. Methode: Eine Metasynthese, die der Methode nach Noblit und Hare (1988) folgte, wurde durchgeführt. Die Ergebnisse von 13 qualitativen Studien aus sechs Ländern wurden einbezogen. Ergebnisse: Die Palliativversorgung eines Menschen mit Krebserkrankung zu Hause kann als instabiler Übergangsprozess verstanden werden, in dessen Verlauf die Familien «um Normalität ringen». Dieser Prozess wird entlang von vier Themen dargestellt. Zudem konnten sechs Selbstmanagementstrategien der Familien identifiziert werden, dies sind das Anerkennen der Situation, die Restrukturierung des Alltags, die Aufrechterhaltung der Balance in den familiären Beziehungen, die Übernahme von Verantwortung, das Nutzen sozialer Unterstützung und der Erwerb von Kompetenzen für Pflege und Betreuung. Schlussfolgerung: Aus den vielfältigen Selbstmanagementstrategien ergeben sich wertvolle Ansätze für die Unterstützung von Angehörigen im Rahmen palliativer Begleitung und Beratung.

  4. Preparation courses for medical clerkships and the final clinical internship in medical education - The Magdeburg Curriculum for Healthcare Competence.

    PubMed

    Spura, Anke; Werwick, Katrin; Feißel, Annemarie; Gottschalk, Marc; Winkler-Stuck, Kirstin; Robra, Bernt-Peter; Braun-Dullaeus, Rüdiger C; Stieger, Philipp

    2016-01-01

    Hintergrund/ Zielsetzung: Zur Vorbereitung der Praxisphasen Famulatur und Praktisches Jahr (PJ) wurden im Jahr 2014 erstmalig die Seminare „Fit für Famulatur“ und „Fit für PJ“ durchgeführt und 2015 erfolgreich fortgesetzt. Das „Magdeburger Curriculum zur Versorgungskompetenz“ (MCV) bildet dafür den programmatischen Rahmen. Diese curriculare Leitidee umfasst drei Themenfelder „interdisziplinäre klinische Abläufe verstehen“, „interprofessionelle Zusammenarbeit“, „Einzelfall- und Systembezug“. Ziel ist es, die Studierenden für ihre Rolle in den Praxisphasen Famulatur und PJ zu stärken.Methodik: Qualitätssichernde Evaluationen und Lehrforschung begleiten die Fit-für-Lehrveranstaltungen. Der Konzeption des „Fit für PJ“-Seminars ging außerdem eine Bedarfsanalyse zu möglichen Inhalten voraus. Die Fit-für-Seminarreihe wurde mit einem anonymisierten Fragebogen evaluiert, der aus einer 5-stufigen Likert-Skala („1=stimme voll zu“ bis „5=stimme nicht zu“) und Freitextfeldern bestand und mit der Evaluationssoftware Evasys generiert wurde.Ergebnisse: Vorgestellt werden die Ergebnisse der Vorbereitungsseminare „Fit für Famulatur“ und „Fit für PJ“ 2014 und 2015. Insgesamt sahen die Studierenden das fakultative Lehrangebot als sehr gute Vorbereitung auf die anstehenden Famulaturen sowie das Praktische Jahr an. Die dreiteilige curriculare Leitidee wurde als sinnvoller didaktischer Ansatz in der Evaluation anerkannt. Interprofessionelle Zusammenarbeit wurde positiv bewertet, von einem interprofessionellen DozentInnen-Team umgesetzt und sehr geschätzt. Schlussfolgerung: Das „Magdeburger Curriculum zur Versorgungskompetenz“ (MCV) integriert Famulatur und PJ in ein nachhaltiges didaktisches Gesamtkonzept und ermöglicht Studierenden, ihre Aufgaben/Rolle in der Patientenversorgung besser wahrzunehmen. Das MCV kann in weiteren Praxisphasen (Pflegepraktikum, UAK, Blockpraktika) eingesetzt werden.

  5. Challenges for medical educators: results of a survey among members of the German Association for Medical Education.

    PubMed

    Huwendiek, Sören; Hahn, Eckhart G; Tönshoff, Burkhard; Nikendei, Christoph

    2013-01-01

    Hintergrund: Trotz des zunehmenden Interesses an der medizinischen Aus-, Weiter- und Fortbildung bestehen im deutschsprachigen Raum derzeit keine Erkenntnisse über die von Lehrenden in der Medizin wahrgenommenen Herausforderungen in diesem Bereich. Vor diesem Hintergrund führten wir eine webbasierte Fragebogenerhebung unter den Mitgliedern der Gesellschaft für Medizinische Ausbildung e. V. (GMA) durch.Methodik: Im Rahmen einer umfassenden Erhebung zum Qualifizierungsbedarf, der Expertise und den Rahmenbedingungen engagierter Lehrender in der Medizin wurden die drei zentralen Herausforderungen erfragt, denen sich Lehrende in der Medizin ausgesetzt sehen und für die sie einen besonderen Bedarf an Unterstützung und/oder Veränderung sehen. Anhand von qualitativer Inhaltsanalyse wurden die Ergebnisse erstellt.Ergebnisse: Der Fragebogen wurde von 147 der 373 Mitglieder des Email-Verteilers der GMA (Rücklauf: 39%) ausgefüllt. Die Lehrenden gaben insgesamt 346 zentrale Herausforderungen im Bereich der Lehre an mit dem Schwerpunkt in folgenden Bereichen: Zu niedrige akademische Anerkennung des Einsatzes im Bereich der Lehre (53,5% der Antwortenden), zu geringe institutionelle (31,5%) und finanzielle (28,4%) Unterstützung, reformbedürftige Curricula (22,8%), zu wenig freie Zeit für Lehraufgaben (18,9%), zu niedrige Kompetenz der Lehrenden in Unterrichtsmethodik (18,1%), unzureichende Fakultätsentwicklungsprogramme (18,1%), unzureichende Vernetzung innerhalb der Institution (11,0%), genereller Mangel an Lehr-Personal (10,2%), die unterschiedlichen Voraussetzungen von Studierenden (8,7%), unzureichende Anerkennung und Vermittlung von Lehr-Forschung (5,5%), großer Prüfungsaufwand (4,7%) und fehlende Vorbilder im Bereich der medizinischen Ausbildung (3,2%).Schlussfolgerung: Als Herausforderungen werden von Lehrenden der Gesellschaft für Medizinische Ausbildung insbesondere die zu niedrige akademische Anerkennung und zu geringe institutionelle und finanzielle

  6. The effects of anonymity on student ratings of teaching and course quality in a bachelor degree programme.

    PubMed

    Scherer, Theresa; Straub, Jan; Schnyder, Daniel; Schaffner, Noemi

    2013-01-01

    Zielsetzung und Fragestellung: Unterscheiden sich die Ergebnisse anonymisierter und personalisierter Evaluationen? Methodik: Während zweier Jahre wurden bei jeder Modulevaluation alle Studierenden randomisiert den Halbgruppen „anonym“ und „personalisiert“ zugeteilt. Die Qualität des Moduls in seinen relevanten Aspekten wurde mit einem standardisierten Fragebogen erhoben. Zusätzlich konnten optionale Textantworten formuliert werden. Drei unabhängige Personen bewerteten die Aussagequalität der Antworten gemäss einem Leitfaden. Dieser beinhaltete die fünf Dimensionen positiv-negativ, differenziert-absolut, Nennung einer Person-allgemein, Befehl enthaltend-neutral und optisch akzentuiert-blank. Der Datensatz bestand aus 615 Fragebogen, davon waren 306 in anonymer Form. Mit einer multivariaten Varianzanalyse wurde überprüft, ob sich zwischen anonym und personalisiert erhobenen Daten ein Unterschied sowohl bei den durch Skalen bewerteten Aspekten als auch bei der Qualität der optionalen Textantworten zeigte. Zusätzlich wurde untersucht, ob sich die Häufigkeit der optionalen Textantworten unterschied.Ergebnisse: In der Aussagequalität liess sich kein signifikanter Unterschied zwischen anonym und personalisiert erhobenen Daten nachweisen. Hingegen haben Studierende aus der personalisierten Gruppe tendenziell häufiger optionale Textantworten geliefert.Schlussfolgerung: Personalisierte Evaluationen generieren dann keine verfälschten Resultate im Sinne der sozialen Erwünschtheit, wenn der Evaluationszirkel geschlossen und transparent ist: Die Verantwortlichen melden den Studierenden die Evaluationsergebnisse konsequent zurück und Änderungs-, Optimierungswünsche und Umsetzungsmöglichkeiten werden mit ihnen diskutiert. Die Studierenden erfahren so, dass ihre Rückmeldungen ernst genommen werden. So können sie sich echte Kritik erlauben.

  7. Bewehrte Betonbauteile unter Betriebsbedingungen: Forschungsbericht

    NASA Astrophysics Data System (ADS)

    Eligehausen, Rolf; Kordina, Karl; Schießl, Peter

    2000-09-01

    Vorwort. Teil I: Rißbreiten (Gert König) 1 Ein mechanisches Modell zur Erhöhung der Vorhersagegenauigkeit über die Rißbreiten unter Betriebsbedingungen (Gert König und Michael Fischer). 1.1 Einleitung und Zielsetzung. 1.2 Versuchsprogramm. 1.3 Meßtechnik. 1.4 Belastung und Versuchsdurchführung. 1.5 Literatur. 2 Rißbreiten und Verformungszunahme vorgespannter Bauteile unter wiederholter Last - und Zwangbeanspruchung (Gert König und Michael Fischer). 2.1 Einleitung und Zielsetzung. 2.2 Versuchsprogramm. 2.3 Auswertung. 2.4 Ausblick. 2.5 Literatur. 3 Rißverhalten von Beton bei plötzlicher Abkühlung (Viktor Mechtcherine und Harald S. Müller). 3.1 Einleitung. 3.2 Experimentelle Untersuchungen. 3.3 Formulierung eines Stoffgesetzes für thermisch beanspruchten Beton. 3.4 Riß entwicklung in einer Betonplatte unter Temperaturschock. 3.5 Zusammenfassung. 3.6 Literatur. 4 Stahlfaserbeton unter Betriebsbedingungen bei Dauerbeanspruchung (Bo Soon Kang, Bernd Schnütgen und Friedhelm Stangenberg). 4.1 Einleitung. 4.2 Wirkung von Stahlfasern im Beton. 4.3 Versuchsprogramm. 4.4 Untersuchungen zum Verbundverhalten. 4.5 Untersuchungen zum Verhalten unter Biegebeanspruchung. 4.6 Theoretische Untersuchungen. 4.7 Literatur. 5 Experimentelle Untersuchungen an Stahlbeton-Zugkörpern unter wiederholter Belastung zur Ermittlung des versteifenden Einflusses der Mitwirkung des Betons zwischen den Rissen (Petra Seibel und Gerhard Mehlhorn). 5.1 Einleitung. 5.2 Ansatz zur Bestimmung der Mitwirkung des Betons zwischen den Rissen nach Eurocode 2, Model Code 90 und Günther. 5.3 Experimentelle Untersuchungen. 5.4 Ergebnisse. 5.5 Zusammenfassung. 5.6 Literatur. 6 Riß- und Verformungsverhalten von vorgefertigten Spannbetonträgern unter Betriebsbedingungen bei besonderer Berücksichtigung des Betonalters (Monika Maske, Heinz Meichsner und Lothar Schubert). 6.1 Einleitung. 6.2 Beschreibung der Fertigteilträger. 6.3 Belastungsversuche. 6.4 Ergebnisse. 6.5 Zusammenfassung. 6

  8. Sonification of acoustic emission data

    NASA Astrophysics Data System (ADS)

    Raith, Manuel; Große, Christian

    2014-05-01

    purposes (students, co-workers). On goal is to establish a real-time frequency transformation into the audio range to avoid time consuming visual data processing during the experiments. It is also the intention to analyze the signals using psycho-acoustic methods with the help of specialists from electrical engineering. Reference: Raith, Manuel (2013). "Schallemissionsanalyse bei Pulloutexperimenten an Verbunddübeln" Masterarbeit. Technische Universität München, Lehrstuhl für Zerstörungsfreie Prüfung. Malm, Fabian (2012). "Schallemissionsanalyse am humanen Femur" Masterarbeit. Technische Universität München, Lehrstuhl für Zerstörungsfreie Prüfung. Richter R. (2009): Einsatz der Schallemissionsanalyse zur Detektion des Riss und Abplatzungsverhaltens von Beton unter Brandeinwirkung. Diplomarbeit. Materialprüfungsanstalt Universität Stuttgart Keywords: Acoustic emission, bonded anchors, femur, pullout test, fire-spalling

  9. Immunotoxicity and genotoxicity testing for in-flight experiments under microgravity

    NASA Astrophysics Data System (ADS)

    Hansen, Peter-Diedrich; Hansen, Peter-Diedrich; Unruh, Eckehardt

    Life Sciences as Related to Space (F) Influence of Spaceflight Environment on Biological Systems (F44) Immunotoxicity and genotoxicity testing for In-flight experiments under microgravity Sensing approaches for ecosystem and human health Author: Peter D. Hansen Technische Universit¨t Berlin, Faculty VI - Planen, Bauen, Umwelt, a Institute for Ecological Research and Technology, Department for Ecotoxicology, Berlin, Germany Peter-diedrich.hansen@tu-berlin.de Eckehardt Unruh Technische Universit¨t Berlin, Faculty VI - Planen, Bauen, Umwelt, Institute a for Ecological Research and Technology, Department for Ecotoxicology, Berlin, Germany An immune response by mussel hemocytes is the selective reaction to particles which are identified as foreign by its immune system shown by phagocytosis. Phagocytotic activity is based on the chemotaxis and adhesion, ingestion and phagosome formation. The attachment at the surface of the hemocytes and consequently the uptake of the particles or bacteria can be directly quantified in the format of a fluorescent assay. Another relevant endpoint of phagocytosis is oxidative burst measured by luminescence. Phagocytosis-related production of ROS will be stimulated with opsonised zymosan. The hemocytes will be stored frozen at -80oC and reconstituted in-flight for the experiment. The assay system of the TRIPLELUX-B Experiment has been performed with a well-defined quantification and evaluation of the immune function phagocytosis. The indicator cells are the hemocytes of blue mussels (Mytilus edulis). The signals of the immuno cellular responses are translated into luminescence as a rapid optical reporter system. The results expected will determine whether the observed responses are caused by microgravity and/or radiation (change in permeability, endpoints in genotoxicity: DNA unwinding). The samples for genotoxicity will be processed after returning to earth. The immune system of invertebrates has not been studied so far in space. The

  10. ESPACE - a geodetic Master's program for the education of Satellite Application Engineers

    NASA Astrophysics Data System (ADS)

    Hedman, K.; Kirschner, S.; Seitz, F.

    2012-04-01

    In the last decades there has been a rapid development of new geodetic and other Earth observation satellites. Applications of these satellites such as car navigation systems, weather predictions, and, digital maps (such as Google Earth or Google Maps) play a more and more important role in our daily life. For geosciences, satellite applications such as remote sensing and precise positioning/navigation have turned out to be extremely useful and are meanwhile indispensable. Today, researchers within geodesy, climatology, oceanography, meteorology as well as within Earth system science are all dependent on up-to-date satellite data. Design, development and handling of these missions require experts with knowledge not only in space engineering, but also in the specific applications. That gives rise to a new kind of engineers - satellite application engineers. The study program for these engineers combines parts of different classical disciplines such as geodesy, aerospace engineering or electronic engineering. The satellite application engineering program Earth Oriented Space Science and Technology (ESPACE) was founded in 2005 at the Technische Universität München, mainly from institutions involved in geodesy and aerospace engineering. It is an international, interdisciplinary Master's program, and is open to students with a BSc in both Science (e.g. Geodesy, Mathematics, Informatics, Geophysics) and Engineering (e.g. Aerospace, Electronical and Mechanical Engineering). The program is completely conducted in English. ESPACE benefits from and utilizes its location in Munich with its unique concentration of expertise related to space science and technology. Teaching staff from 3 universities (Technische Universität München, Ludwig-Maximilian University, University of the Federal Armed Forces), research institutions (such as the German Aerospace Center, DLR and the German Geodetic Research Institute, DGFI) and space industry (such as EADS or Kayser-Threde) are

  11. Impact of a modified Broviac maintenance care bundle on bloodstream infections in paediatric cancer patients.

    PubMed

    Furtwängler, Rhoikos; Laux, Carolin; Graf, Norbert; Simon, Arne

    2015-01-01

    Hintergrund: Während der intensiven Chemotherapie sind bei Kindern mit Krebserkrankungen Blutstrominfektionen (BSI) eine potentiell lebensbedrohliche Komplikation. Die meisten Patienten haben einen dauerhaft implantierten oder getunnelten zentralen Venenkatheter (CVAD, z.B. Broviac). Ein verbessertes Protokoll der Erhaltungspflege kann möglicherweise die Rate von BSI senken. Methode: Interventionsstudie zum Nutzen eines modifizierten Präventionsbündels in zwei prospektiven Beobachtungszeiträumen (P1: bis 05-2011; P2: 09-2011 bis 05-2013); prospektive Surveillance aller mikrobiologisch gesicherten BSI. In P2 wurden fertig konfektionierte NaCl 0.9% Spritzen (10 ml) zum Spülen des Broviacs verwendet. Außerdem wurden alle Konnektions- und Zuspritzstellen (Dreiwegehähne) mit Octenidin/Propanol desinfiziert.Ergebnisse: Während P1 wurden 84 Patienten und während P2 81 eingeschlossen. Die beiden Patientenpopulationen zeigten keine signifikanten Unterschiede in Bezug auf das Alter, die Grunderkrankung oder ihren Status (Anteil mit Rezidiv). Praktisch alle CVAD waren Broviac-Katheter. Die mediane Nutzungsdauer lag in P1 bei 192 d (Interquartile-Range (IQR); 110–288 Tage) und in P2 bei 191 d (IQR; 103–270 Tage). In P1 wurden insgesamt 28 BSI bei 22 Patienten diagnostiziert (Inzidenz für mind. 1 BSI 26%), in P2 waren es nur 15 BSI bei 12 Patienten in P2 (Inzidenz 15%). Die entsprechenden Ergebnisse für die Inzidenzdichte lagen bei 0.44 (CI95 0.29–0.62) BSI pro 100 stationäre Patiententage für P1 vs. 0.34 (0.19–0.53) für P2. Die Inzidenzrate (IR) pro 1.000 stationäre Anwendungstage lag bei 7.76 (5.16–10.86) für P1 vs. 4.75 (2.66–7.43) für P2. Während in P1 9 BSI durch CoNS detektiert wurden, waren es in P2 nur 2 (IR 2.49; CI95 0.17–4.17 vs. 0.63; CI95 0.08–1.72). Fazit: Das modifizierte Präventionsbündel führte zu einer Reduktion von BSI bei pädiatrisch onkologischen Patenten mit Broviac Katheter. Wie in einigen Studien U

  12. Simulating the physician as healthcare manager: An innovative course to train for the manager role.

    PubMed

    Gradel, Maximilian; Moder, Stefan; Nicolai, Leo; Pander, Tanja; Hoppe, Boj; Pinilla, Severin; Von der Borch, Philip; Fischer, Martin R; Dimitriadis, Konstantinos

    2016-01-01

    Einleitung: Medizinstudierende erlangen durch ihre Ausbildung ein umfassendes medizinisches Fachwissen. Allerdings erfordert der Arztberuf zusätzliche Fähigkeiten wie Ressourcenallokation, Wirtschaftlichkeit, Konzeption, Organisation und Prozessmanagement im Gesundheitssystem. Auf die Rolle des Arztes als Manager werden die Studierenden nicht ausreichend vorbereitet. Deshalb entwickelten wir den Kurs MeCuM-SiGma, welcher Medizinstudierenden die Grundlagen von Gesundheitspolitik und -management vermittelt. In diesem Projektbericht stellen wir das didaktische Konzept und erste Ergebnisse der Evaluation des Lehrprojekts vor. Projektbeschreibung: Der seit 2010 bestehende, einsemestrige Kurs vermittelt Medizinstudierenden neben den oben bereits erwähnten Kenntnissen grundlegende Managementkompetenzen. Das immer im Wintersemester stattfindende, freiwillige Lehrprojekt wird ehrenamtlich von Ärzten und Mitarbeitern des Mentoring-Büros (MeCuM-Mentor) der medizinischen Fakultät der LMU München koordiniert sowie organisiert und steht allen Medizinstudierenden der beiden medizinischen Fakultäten in München zur Teilnahme offen. In der ersten Phase dieses Zusatzangebots lernen die Studierenden in fallbasierten, problem-orientierten Tutorials unter Anleitung von geschulten Tutoren und in Expertenvorträgen u.a. die Grundlagen des politischen Systems und des Gesundheitssystems in Deutschland kennen. In der zweiten Phase nehmen die Teilnehmer die Rollen der Mitglieder des Vorstandes sowie des Aufsichtsrates des Klinikums der Universität München ein und bearbeiten in Teamarbeit im Rahmen einer Simulation ein bereits bestehendes Projekt des Klinikums. Begleitet wird diese Phase von Workshops zu den prozeduralen Lernzielen (u.a. zu Teamarbeit, Projektmanagement und Verhandlungsstrategien), die in Kooperation mit inner- und außeruniversitären Kooperationspartnern durchgeführt werden. In enger Zusammenarbeit mit dem Vorstand des Klinikums wird von den Kursverantwortlichen

  13. Video-based instructions for surgical hand disinfection as a replacement for conventional tuition? A randomised, blind comparative study.

    PubMed

    Weber, Uwe; Constantinescu, Mihai A; Woermann, Ulrich; Schmitz, Felix; Schnabel, Kai

    2016-01-01

    Einleitung: Für die Unterrichtsgestaltung zur Einführung der chirurgischen Händedesinfektion stehen unterschiedliche Lernmethoden zur Verfügung. Diese Lernmethoden sollen dabei helfen, das Unterrichtsthema zu strukturieren und zu bewältigen. Der Einsatz eines Videofilms ist, durch die realen Darstellungsmöglichkeiten der praktischen Demonstration, eine Alternative zum konventionellen Unterricht. Ziel: Mit der vorliegenden Studie wird vergleichend untersucht, welche Vermittlungsform effektiver für das Erlernen und Anwenden der chirurgischen Händedesinfektion von Medizinstudenten im 1. Studienjahr ist: videobasierte Instruktion oder konventioneller Unterricht.Methodik: Insgesamt wurden 50 Medizinstudierende im 1. Studienjahr per Zufall entweder der Lerngruppe „konventionelle Instruktion“ (KI) oder der Lerngruppe „videobasierte Instruktion“ (VI) zugeordnet. Die konventionelle Instruktion erfolgte durch einen erfahrenen Nurse Preceptors/Nurse Educators für den Operationssaal, der die vorzubereitenden Massnahmen sowie die eigentliche Prozedur im Rahmen einer zweiminütigen Lektion vermittelte. Die zweite Gruppe sah eine Videosequenz von 2 Minuten mit identischen Inhalten. Beide Gruppen demonstrierten ihr akkumuliertes Wissen im Anschluss praktisch an einer einzelnen praktischen Prüfungsstation. Die Güte (a) der Vorbereitung und (b) der Prozedur wurde ebenso wie (c) die Qualität des Ergebnisses von 6 geblendeten Experten anhand einer Checkliste beurteilt. Die Akzeptanz der jeweiligen Vermittlungsform wurde mittels eines Fragebogens erfragt.Ergebnisse: Die Gruppenleistungen unterschieden sich weder in der Vorbereitung (t=-78, p<0.44) noch in der Qualität (t=-99, p<0.34). In Hinblick auf die Performanz konnte ein starker Treatment-Effekt nachgewiesen werden. In der Durchführung (t=-3.33, p<0.002, d=0.943) sowie im Total Score (t=-2.65, p<0.011, d=0.751) erzielte die Gruppe mit videobasierter Instruktion ein signifikant besseres Ergebnis. Auf die Frage

  14. The subjective experience of collaboration in interprofessional tutor teams: A qualitative study.

    PubMed

    Weber, Tobias; Hoffmann, Henriette

    2016-01-01

    Zielsetzung: Das Medizinische Interprofessionelle Trainingszentrum der Medizinischen Fakultät Carl Gustav Carus an der Technischen Universität Dresden bietet seit dem Wintersemester 2014/2015 Lehrveranstaltungen mit interprofessionellen Inhalten an. Die Besonderheit dieser Lehreinheiten besteht darin, dass sowohl studentische TutorInnen der Medizin als auch SchülertutorInnen der Gesundheits- und Krankenpflege gemeinsam die Lehreinheiten betreuen. Die Studie untersucht das subjektive Erleben der TutorInnen während der gemeinsamen Ausarbeitung und Durchführung dieser Lehreinheiten mit dem Ziel, die Effekte der gleichberechtigten Zusammenarbeit auf die Wahrnehmung und Einschätzung der jeweils anderen Berufsgruppe herauszuarbeiten. Methode: Es wurden teilstrukturierte Leitfadeninterviews mit sechs zufällig ausgewählten TutorInnen durchgeführt. Diese werden mittels inhaltlich-strukturierender Inhaltsanalyse ausgewertet.Ergebnisse: Die Ergebnisse zeigen, dass das gemeinsame Arbeiten vor allem bei den studentischen TutorInnen zu einer Reflexion bestehender Einstellungen geführt hat, jedoch wurden die jeweiligen Co-TutorInnen bei beiden Berufsgruppen in unterschiedlichem Grad als Repräsentanten ihrer Profession wahrgenommen. Durch die Bewältigung einer gemeinsamen Aufgabe in einem nicht-klinischen Kontext begegneten sich die Angehörigen der verschiedenen Berufsgruppen auf Augenhöhe, wenngleich die Medizinstudierenden bereits mehr didaktische Erfahrung aufwiesen und somit im Zuge der Erarbeitung und der Umsetzung der Lehreinheiten meist eine Mentoren-Rolle übernahmen. Die SchülertutorInnen waren vorwiegend auf ihre Rolle als TutorIn konzentriert. Hervorgehoben wurde von beiden Berufsgruppen, dass sie vor der Zusammenarbeit mangelnde oder keine Vorstellungen bezüglich des theoretischen Wissens und der praktischen Fertigkeiten der jeweils anderen Berufsgruppe besaßen. Das Projekt insgesamt wurde als gewinnbringend eingeschätzt und der Ansatz der

  15. [Associations with ADHD and parental distress with in play in early childhood].

    PubMed

    Weber-Börgmann, Insa; Burdach, Stefan; Barchfeld, Petra; Wurmser, Harald

    2014-05-01

    Fragestellung: Frühkindliche «Spielunlust» könnte nach Papoušek (2004) ein früher Hinweis auf die Entwicklung einer AD(H)S im Schulalter sein. Das Phänomen Spielunlust ist verbunden mit Leidensdruck bei Eltern und Kind sowie Störungen der Eltern-Kind-Beziehungen (Papoušek, 2003). In dieser Studie wurden deshalb der Zusammenhang zwischen frühkindlicher Spielunlust und AD(H)S sowie deren Assoziationen mit der mütterlichen Stressbelastung untersucht. Methodik: Die Stichprobe umfasste 35 AD(H)S-Kinder im Grundschulalter [Alter: M (SD) = 9.0 (1.1) Jahre; Jungenanteil: 30 (85.7 %)] und eine Kontrollgruppe mit 42 Kindern ohne AD(H)S [Alter: M (SD) = 8.8 (1.0) Jahre; Jungenanteil: 35 (83.3 %)]. Anhand eines Fragebogens zur frühkindlichen Spielfähigkeit erfolgte eine Einteilung in 39 Kinder mit geringerer Spiellust und 38 Kinder mit höherer Spiellust. Die mütterliche Stressbelastung wurde mittels einer deutschen Version des Parenting Stress Index (Abidin, 1995) erfasst. Ergebnisse: AD(H)S fand sich signifikant häufiger bei Kindern mit frühkindlicher Spielunlust. Die Stressbelastung war bei Müttern von Kindern mit frühkindlicher Spielunlust signifikant erhöht, wobei sie bei Müttern von spielunlustigen AD(H)S-Kindern am höchsten, bei Müttern von spielfähigen Kindern ohne AD(H)S am geringsten ausgeprägt war. Schlussfolgerungen: Die Ergebnisse sind vereinbar mit der These, dass frühkindliche Spielunlust im Zusammenhang mit der Entwicklung einer späteren AD(H)S steht und einen zusätzlichen Stressor für betroffene Mütter darstellt.

  16. The use of Facebook in medical education--a literature review.

    PubMed

    Pander, Tanja; Pinilla, Severin; Dimitriadis, Konstantinos; Fischer, Martin R

    2014-01-01

    Hintergrund: Die Verbreitung sozialer Medien beeinflusst und verändert die Kommunikationskultur sowie die Lern- und Lehrmöglichkeiten in der medizinischen Ausbildung. Das beliebteste soziale Netzwerk ist Facebook. Seine Eigenschaften bieten ein großes Potenzial für die medizinische Ausbildung, bringen aber auch einige neue Herausforderungen mit sich.Ziele: Dieser systematische Literaturüberblick zielt darauf ab, herauszufinden, wie Facebook bisher in der medizinischen Ausbildung integriert, eingesetzt und beforscht wurde. Nach einer systematischen Durchsicht der aktuellen Literatur, werden Forschungslücken identifiziert, Verbindungen zu vorherigen Arbeiten gezogen, die bisherigen Ergebnisse systematisch analysiert und Konsequenzen diskutiert.Methode: Die Autoren durchsuchten sechs online-basierte Literatur-Datenbanken. Sie definierten Einschlusskriterien und überprüften unabhängig voneinander die Suchergebnisse. Die wichtigsten Informationen der Artikel wurden methodisch abstrahiert und kodiert und in den Kategorien Studiendesign, Phase der Studienteilnehmer in der medizinischen Ausbildung und Studieninhalt dargestellt und diskutiert.Ergebnisse: 16 Artikel erfüllten alle Einschlusskriterien. 45-96% der Mediziner und Medizinstudierenden haben ein Facebook-Profil. Die meisten Studien konzentrierten sich auf Facebook und digitale Professionalität. Unprofessionelles Verhalten und Verstöße gegen den Datenschutz traten in 0,02% bis 16% der Fälle auf. In Hinblick auf den Einsatz als Lehr- und Lernumgebung wird Facebook von Medizinstudierenden gut akzeptiert. Es wird verwendet, um sich für Prüfungen vorzubereiten, Online-Materialien zu teilen, klinische Fälle zu diskutieren, Treffen zu organisieren und Informationen über Famulaturen auszutauschen. Einige Unterrichtsmaterialien für den professionellen Umgang mit Facebook wurden positiv beurteilt. Es scheint allerdings keine Beweise dafür zu geben, dass Medizinstudierende von Facebook als Lernumgebung

  17. Workplace learning: an analysis of students' expectations of learning on the ward in the Department of Internal Medicine.

    PubMed

    Köhl-Hackert, Nadja; Krautter, Markus; Andreesen, Sven; Hoffmann, Katja; Herzog, Wolfgang; Jünger, Jana; Nikendei, Christoph

    2014-01-01

    Hintergrund: Innerhalb der medizinischen Ausbildung angehender Ärzte kommt dem Lernen am späteren Arbeitsplatz als praxisrelevante Vorbereitung auf die spätere ärztliche Tätigkeit eine entscheidende Rolle zu. Doch studentische Stationseinsätze sind aufgrund verdichteter Arbeitsabläufe auf Station und Arbeitsbelastung der betreuenden Stationsärzte problembehaftet. Erstmals werden hier im deutschsprachigen Raum die studentischen Erwartungen und Befürchtungen im Hinblick auf die Stationseinsätze im klinischen Studienabschnitt für den Fachbereich der Inneren Medizin untersucht.Methodik: 28 Medizinstudierende des 6. Semesters der Medizinischen Fakultät Heidelberg (m=8; w=20; Ø 23,6 Jahre) nahmen 3-5 Tage vor ihrem Stationseinsatz in der Inneren Medizin verteilt auf vier Fokusgruppen an jeweils einer Fokusgruppenanalyse teil. Die Protokolle wurden transkribiert und inhaltsanalytisch auf der Grundlage der Grounded Theory ausgewertet.Ergebnisse: Es wurden insgesamt 489 relevante Einzelaussagen erfasst: Die Studierenden wünschen sich eine gelungene Integration auf Station, verlässliche und unterstützende ärztliche Betreuer und eine Betreuung in kleinen Gruppen; sie erwarten sich die häufigsten Krankheitsbilder kennenzulernen, die wichtigsten ärztlichen Fertigkeiten zu trainieren, Verantwortung für eigene Patienten zu übernehmen und eine eigene ärztliche Identität zu entwickeln. Die Studierenden befürchten einen zu knappen zeitlichen Rahmen, zu wenig Patientenkontakt und eine mangelhafte ärztliche Betreuung.Schlussfolgerung: Bei der Entwicklung und Standardisierung effektiver studentischer Stationseinsätze sollte der ärztlichen Betreuung und Supervision durch professionell geschulte und gut vorbereitete ärztliche Dozenten höchste Relevanz zukommen, was einen erheblichen Mehraufwand an personellen und finanziellen Ressourcen bedeutet. Es bedarf strukturell gelungener Rahmenbedingungen, die es ermöglichen, den Studierenden frühzeitig und

  18. Why do - or don't - patients with urinary tract infection participate in a clinical trial? A qualitative study in German family medicine.

    PubMed

    Bleidorn, Jutta; Bucak, Sermin; Gágyor, Ildikó; Hummers-Pradier, Eva; Dierks, Marie-Luise

    2015-01-01

    Hintergrund: Die Durchführung vieler klinischer Studien wird beeinträchtigt durch ungenügenden Patienteneinschluss, nicht zuletzt aufgrund einer nennenswerten Anzahl infrage kommender Patienten, die eine Studienteilnahme ablehnen. Auch wenn Barrieren und motivierende Faktoren für eine Studienteilnahme von Patienten mit onkologischen Erkrankungen oder chronischen Krankheiten bereits untersucht wurden, ist wenig bekannt über die diesbezügliche Einstellung hausärztlicher Patienten, die mit einer unkomplizierten Erkrankung ihren Hausarzt aufsuchen. Die vorliegende Studie hat zum Ziel, Motivationsfaktoren und Barrieren hausärztlicher Patienten für eine Studienteilnahme zu untersuchen, und Faktoren zu identifizieren, die die Patientenrekrutierung in zukünftigen Studien erleichtern. Methode: Diese Studie war eingebettet in eine Arzneimittelstudie, in der zwei Behandlungsstrategien bei Frauen mit unkompliziertem Harnwegsinfekt im hausärztlichen Setting untersucht wurden. Semistrukturierte telefonische Interviews wurden sowohl mit Studienteilnehmerinnen wie auch mit Ablehnerinnen durchgeführt. Der Interviewleitfaden fokussierte auf den persönlichen motivierenden oder hinderlichen Faktoren der Patientinnen. Weitere Aspekte umfassten das Studienthema, die Rolle des Hausarztes, Randomisierung, Studienabläufe und potentielle motivierende/hinderliche Faktoren für andere Patientinnen. Die Analyse der Transskripte erfolgte mittels zusammenfassender qualitativer Inhaltsanalyse.Ergebnisse: 20 Interviews mit Studienteilnehmerinnen und 5 Interviews mit Ablehnerinnen wurden durchgeführt. Die Ergebnisse zeigen unterschiedliche Gründe für eine Studienteilnahme aus den drei Bereichen: persönliche Aspekte, studienbezogene Aspekte und Beziehung zum Hausarzt. Ein relevantes Studienthema und ein wahrgenommener persönlicher Benefit fördert die Studienteilnahme ebenso wie der generelle Wunsch, Forschung zu unterstützen. Die Gewissheit, dass in jedem Fall mit einer

  19. The Second Mössbauer Effect

    NASA Astrophysics Data System (ADS)

    Kienle, Paul

    "The Second Mössbauer Effect" was the headline of the "Spiegel" (a German weekly journal like the "Times") from May 13, 1964 for announcing the foundation of the "Physik-Department" at the Technische Hochschule München (THM), as it was still called at this time. Maier-Leibnitz was irritated by this headline because the article did not mention at all his contribution to the consolidation of the structure of the three physics institutes (Experimental, Technical, and Theoretical Physics) in the beginning of the sixties. Already in the late fifties ML's Institute for Technical Physics was overloaded with students working on their diploma or doctoral theses, because research in the new field of applied nuclear physics was very attractive and ML had for each student who applied an interesting research project. In the average, ML had to supervise between 150-200 diploma students, an impossible task. So, young postdoctoral students had to help him out by taking over the duties of professors. In a letter to the Bavarian Ministry of Education and Arts in 1957 he complained: "The directors of the institutes are hopelessly surcharged and the institutes are overcrowded, the resources for research projects are totally insufficient and lots of time and energy is wasted for finding additional resources."

  20. Time-resolved fast-neutron radiography of air-water two-phase flows in a rectangular channel by an improved detection system.

    PubMed

    Zboray, Robert; Dangendorf, Volker; Mor, Ilan; Bromberger, Benjamin; Tittelmeier, Kai

    2015-07-01

    In a previous work, we have demonstrated the feasibility of high-frame-rate, fast-neutron radiography of generic air-water two-phase flows in a 1.5 cm thick, rectangular flow channel. The experiments have been carried out at the high-intensity, white-beam facility of the Physikalisch-Technische Bundesanstalt, Germany, using an multi-frame, time-resolved detector developed for fast neutron resonance radiography. The results were however not fully optimal and therefore we have decided to modify the detector and optimize it for the given application, which is described in the present work. Furthermore, we managed to improve the image post-processing methodology and the noise suppression. Using the tailored detector and the improved post-processing, significant increase in the image quality and an order of magnitude lower exposure times, down to 3.33 ms, have been achieved with minimized motion artifacts. Similar to the previous study, different two-phase flow regimes such as bubbly slug and churn flows have been examined. The enhanced imaging quality enables an improved prediction of two-phase flow parameters like the instantaneous volumetric gas fraction, bubble size, and bubble velocities. Instantaneous velocity fields around the gas enclosures can also be more robustly predicted using optical flow methods as previously.

  1. The PTB underground laboratory for dosimetry and spectrometry

    PubMed

    Neumaier; Arnold; Bohm; Funck

    2000-07-01

    In 1991, the Physikalisch-Technische Bundesanstalt established an underground laboratory for dosimetry and spectrometry (UDO) at the Asse salt mine, near Braunschweig. Due to the depth of 925 m below ground (equivalent to about 2100 m of water), the cosmic ray muon intensity in this facility is reduced by more than 5 orders of magnitude. In addition, the low specific activity of the pure rock salt and a low concentration of radon lead to an extremely low ambient dose equivalent rate of less than 1 nSv/h. The UDO facility is therefore well suited for dosimetry at very low dose rates, as well as for Ultra-Low-Background (ULB) gamma-ray spectrometry. In 1998, a coaxial low-background HPGe-detector (88% relative efficiency, FWHM 2.0 keV at 1.33 MeV) with an extended shielding (20 cm low-activity lead, 1 cm electrolytic copper, N2-flushing) was installed at UDO; the count rate per mass of germanium, integrated over the energy range from 40 to 2750 keV, was measured to be 0.012 s(-1) kg(-1). Results from test measurements and first applications are reported. The design of a ULB gamma-detector system, presently under construction, is described.

  2. Low-level measuring techniques for neutrons: High accuracy neutron source strength determination and fluence rate measurement at an underground laboratory

    SciTech Connect

    Zimbal, Andreas; Reginatto, Marcel; Schuhmacher, Helmut; Wiegel, Burkhard; Degering, Detlev; Zuber, Kai

    2013-08-08

    We report on measuring techniques for neutrons that have been developed at the Physikalisch-Technische Bundesanstalt (PTB), the German National Metrology Institute. PTB has characterized radioactive sources used in the BOREXINO and XENON100 experiments. For the BOREXINO experiment, a {sup 228}Th gamma radiation source was required which would not emit more than 10 neutrons per second. The determination of the neutron emission rate of this specially designed {sup 228}Th source was challenging due to the low neutron emission rate and because the ratio of neutron to gamma radiation was expected to be extremely low, of the order of 10{sup −6}. For the XENON100 detector, PTB carried out a high accuracy measurement of the neutron emission rate of an AmBe source. PTB has also done measurements in underground laboratories. A two month measurement campaign with a set of {sup 3}He-filled proportional counters was carried out in PTB's former UDO underground laboratory at the Asse salt mine. The aim of the campaign was to determine the intrinsic background of detectors, which is needed for the analysis of data taken in lowintensity neutron fields. At a later time, PTB did a preliminary measurement of the neutron fluence rate at the underground laboratory Felsenkeller operated by VKTA. By taking into account data from UDO, Felsenkeller, and detector calibrations made at the PTB facility, it was possible to estimate the neutron fluence rate at the Felsenkeller underground laboratory.

  3. EDITORIAL: Precision Density Measurements of Solids and Liquids

    NASA Astrophysics Data System (ADS)

    Bettin, Horst

    2006-10-01

    This special feature is dedicated to methods and applications of density measurements of the highest precision. It contains papers from the 210th PTB Seminar 'Precision Density Measurements of Solids and Liquids', which was held at the Physikalisch-Technische Bundesanstalt, Germany, on 24 26 October 2005 and was sponsored by the Helmholtz Funds e.V., Germany. More than 55 density experts from 20 countries attended the seminar. The participants came from national metrological institutes, calibration laboratories, verification offices, universities and manufactures of density meters. Thus, many interesting discussions were stimulated between various groups, in particular between those in research and those working on applications. The main topics of the seminar were the realization of the density unit and its dissemination by comparison methods. The research activities for the determination of the Avogadro constant stimulated the development of new methods as well as the improvement of more conventional methods in order to reach density uncertainties below 0.1 ppm. Technical and physical limitations of the methods were discussed as well as applications and future trends. This special feature contains nine papers based on presentations given at the seminar. Two additional papers on liquid density reference standards and compressibility measurements of liquids complete the feature. I would like to take this opportunity to thank all the authors who contributed to this special feature, which I hope provides an excellent compendium of the topics discussed at the seminar.

  4. Power spectrum analyses of nuclear decay rates

    NASA Astrophysics Data System (ADS)

    Javorsek, D.; Sturrock, P. A.; Lasenby, R. N.; Lasenby, A. N.; Buncher, J. B.; Fischbach, E.; Gruenwald, J. T.; Hoft, A. W.; Horan, T. J.; Jenkins, J. H.; Kerford, J. L.; Lee, R. H.; Longman, A.; Mattes, J. J.; Morreale, B. L.; Morris, D. B.; Mudry, R. N.; Newport, J. R.; O'Keefe, D.; Petrelli, M. A.; Silver, M. A.; Stewart, C. A.; Terry, B.

    2010-10-01

    We provide the results from a spectral analysis of nuclear decay data displaying annually varying periodic fluctuations. The analyzed data were obtained from three distinct data sets: 32Si and 36Cl decays reported by an experiment performed at the Brookhaven National Laboratory (BNL), 56Mn decay reported by the Children's Nutrition Research Center (CNRC), but also performed at BNL, and 226Ra decay reported by an experiment performed at the Physikalisch-Technische Bundesanstalt (PTB) in Germany. All three data sets exhibit the same primary frequency mode consisting of an annual period. Additional spectral comparisons of the data to local ambient temperature, atmospheric pressure, relative humidity, Earth-Sun distance, and their reciprocals were performed. No common phases were found between the factors investigated and those exhibited by the nuclear decay data. This suggests that either a combination of factors was responsible, or that, if it was a single factor, its effects on the decay rate experiments are not a direct synchronous modulation. We conclude that the annual periodicity in these data sets is a real effect, but that further study involving additional carefully controlled experiments will be needed to establish its origin.

  5. World record in high speed laser surface microstructuring of polymer and steel using direct laser interference patterning

    NASA Astrophysics Data System (ADS)

    Lang, Valentin; Roch, Teja; Lasagni, Andrés. F.

    2016-03-01

    Periodic surfaces structures with micrometer or submicrometer resolution produced on the surface of components can be used to improve their mechanical, biological or optical properties. In particular, these surfaces can control the tribological performance of parts, for instance in the automotive industry. In the last years, substantial efforts have been made to develop new technologies capable to produce functionalized surfaces. One of these technologies is the Direct Laser Interference Patterning (DLIP) technology, which permits to combine high fabrication speed with high resolution even in the sub-micrometer range. In DLIP, a laser beam is split into two or more coherent beams which are guided to interfere on the work piece surface. This causes modulated laser intensities over the component's surface, enabling the direct fabrication of a periodic pattern based on selective laser ablation or melting. Depending on the angle between the laser beams and the wavelength of the laser, the pattern's spatial period can be perfectly controlled. In this study, we introduce new modular DLIP optical heads, developed at the Fraunhofer IWS and the Technische Universität Dresden for high-speed surface laser patterning of polymers and metals. For the first time it is shown that effective patterning speeds of up to 0.90 m2/min and 0.36 m2/min are possible on polymer and metals, respectively. Line- and dot-like surface architectures with spatial periods between 7 μm and 22 μm are shown.

  6. Characterizing the cross dispersion reflection gratings of CRIRES+

    NASA Astrophysics Data System (ADS)

    Follert, Roman; Taubert, Dieter; Hollandt, Jörg; Monte, Christian; Oliva, Ernesto; Seemann, Ulf; Löwinger, Tom; Anwand-Heerwart, Heiko; Schmidt, Christof; Dorn, Reinhold J.; Bristow, Paul; Hatzes, Artie; Reiners, Ansgar; Piskunov, Nikolai; Heiter, Ulrike; Stempels, Eric; Marquart, Thomas; Lavail, Alexis; Cumani, Claudio; Grunhut, Jason; Haimerl, Andreas; Hinterschuster, Renate; Ives, Derek J.; Jung, Yves; Kerber, Florian; Klein, Barbara; Lizon, Jean Louis; Molina-Conde, Ignacio; Nicholson, Belinda; Origlia, Livia; Pasquini, Luca; Paufique, Jérôme; Stegmeier, Jörg; Tordo, Sebastien

    2016-08-01

    The CRIRES+ project attempts to upgrade the CRIRES instrument into a cross dispersed Echelle spectrograph with a simultaneous recording of 8-10 diffraction orders. In order to transform the CRIRES spectrograph into a cross-dispersing instrument, a set of six reflection gratings, each one optimized for one of the wavelength bands CRIRES+ will operate in (YJHKLM), will be used as cross dispersion elements in CRIRES+. Due to the upgrade nature of the project, the choice of gratings depends on the fixed geometry of the instrument. Thus, custom made gratings would be required to achieve the ambitious design goals. Custom made gratings have the disadvantage, though, that they come at an extraordinary price and with lead times of more than 12 months. To mitigate this, a set of off-the-shelf gratings was obtained which had grating parameters very close to the ones being identified as optimal. To ensure that the rigorous specifications for CRIRES+ will be fulfilled, the CRIRES+ team started a collaboration with the Physikalisch-Technische Bundesanstalt Berlin (PTB) to characterize gratings underconditions similar to the operating conditions in CRIRES+ (angle of incidence, wavelength range). The respective test setup was designed in collaboration between PTB and the CRIRES+ consortium. The PTB provided optical radiation sources and calibrated detectors for each wavelength range. With this setup, it is possible to measure the absolute efficiency of the gratings both wavelength dependent and polarization state dependent in a wavelength range from 0.9 μm to 6 μm.

  7. Surviving the Glut: The Management of Event Streams in Cyberphysical Systems

    NASA Astrophysics Data System (ADS)

    Buchmann, Alejandro

    Alejandro Buchmann is Professor in the Department of Computer Science, Technische Universität Darmstadt, where he heads the Databases and Distributed Systems Group. He received his MS (1977) and PhD (1980) from the University of Texas at Austin. He was an Assistant/Associate Professor at the Institute for Applied Mathematics and Systems IIMAS/UNAM in Mexico, doing research on databases for CAD, geographic information systems, and objectoriented databases. At Computer Corporation of America (later Xerox Advanced Information Systems) in Cambridge, Mass., he worked in the areas of active databases and real-time databases, and at GTE Laboratories, Waltham, in the areas of distributed object systems and the integration of heterogeneous legacy systems. 1991 he returned to academia and joined T.U. Darmstadt. His current research interests are at the intersection of middleware, databases, eventbased distributed systems, ubiquitous computing, and very large distributed systems (P2P, WSN). Much of the current research is concerned with guaranteeing quality of service and reliability properties in these systems, for example, scalability, performance, transactional behaviour, consistency, and end-to-end security. Many research projects imply collaboration with industry and cover a broad spectrum of application domains. Further information can be found at http://www.dvs.tu-darmstadt.de

  8. Time-resolved Fast Neutron Radiography of Air-water Two-phase Flows

    NASA Astrophysics Data System (ADS)

    Zboray, Robert; Dangendorf, Volker; Mor, Ilan; Tittelmeier, Kai; Bromberger, Benjamin; Prasser, Horst-Michael

    Neutron imaging, in general, is a useful technique for visualizing low-Z materials (such as water or plastics) obscured by high-Z materials. However, when significant amounts of both materials are present and full-bodied samples have to be examined, cold and thermal neutrons rapidly reach their applicability limit as the samples become opaque. In such cases one can benefit from the high penetrating power of fast neutrons. In this work we demonstrate the feasibility of time-resolved, fast neutron radiography of generic air-water two-phase flows in a 1.5 cm thick flow channel with Aluminum walls and rectangular cross section. The experiments have been carried out at the high-intensity, white-beam facility of the Physikalisch-Technische Bundesanstalt, Germany. Exposure times down to 3.33 ms have been achieved at reasonable image quality and acceptable motion artifacts. Different two-phase flow regimes such as bubbly slug and churn flows have been examined. Two-phase flow parameters like the volumetric gas fraction, bubble size and bubble velocities have been measured.

  9. Experimental verification of the individual energy dependencies of the partial L-shell photoionization cross sections of Pd and Mo.

    PubMed

    Hönicke, Philipp; Kolbe, Michael; Müller, Matthias; Mantler, Michael; Krämer, Markus; Beckhoff, Burkhard

    2014-10-17

    An experimental method for the verification of the individually different energy dependencies of L(1)-, L(2)-, and L(3)- subshell photoionization cross sections is described. The results obtained for Pd and Mo are well in line with theory regarding both energy dependency and absolute values, and confirm the theoretically calculated cross sections by Scofield from the early 1970 s and, partially, more recent data by Trzhaskovskaya, Nefedov, and Yarzhemsky. The data also demonstrate the questionability of quantitative x-ray spectroscopical results based on the widely used fixed jump ratio approximated cross sections with energy independent ratios. The experiments are carried out by employing the radiometrically calibrated instrumentation of the Physikalisch-Technische Bundesanstalt at the electron storage ring BESSY II in Berlin; the obtained fluorescent intensities are thereby calibrated at an absolute level in reference to the International System of Units. Experimentally determined fixed fluorescence line ratios for each subshell are used for a reliable deconvolution of overlapping fluorescence lines. The relevant fundamental parameters of Mo and Pd are also determined experimentally in order to calculate the subshell photoionization cross sections independently of any database.

  10. Fuel Thermo-physical Characterization Project: Evaluation of Models to Calculate Thermal Diffusivity of Layered Composites

    SciTech Connect

    Burkes, Douglas; Casella, Amanda J.; Gardner, Levi D.; Casella, Andrew M.; Huber, Tanja K.; Breitkreutz, Harald

    2015-02-11

    The Office of Material Management and Minimization Fuel Thermo-physical Characterization Project at Pacific Northwest National Laboratory (PNNL) is tasked with using PNNL facilities and processes to receive irradiated low enriched uranium-molybdenum fuel plate samples and perform analyses in support of the Office of Material Management and Minimization Reactor Conversion Program. This work is in support of the Fuel Development Pillar that is managed by Idaho National Laboratory. A key portion of the scope associated with this project was to measure the thermal properties of fuel segments harvested from plates that were irradiated in the Advanced Test Reactor. Thermal diffusivity of samples prepared from the fuel segments was measured using laser flash analysis. Two models, one developed by PNNL and the other developed by the Technische Universität München (TUM), were evaluated to extract the thermal diffusivity of the uranium-molybdenum alloy from measurements made on the irradiated, layered composites. The experimental data of the “TC” irradiated fuel segment was evaluated using both models considering a three-layer and five-layer system. Both models are in acceptable agreement with one another and indicate that the zirconium diffusion barrier has a minimal impact on the overall thermal diffusivity of the monolithic U-Mo fuel.

  11. New x-ray parallel beam facility XPBF 2.0 for the characterization of silicon pore optics

    NASA Astrophysics Data System (ADS)

    Krumrey, Michael; Müller, Peter; Cibik, Levent; Collon, Max; Barrière, Nicolas; Vacanti, Giuseppe; Bavdaz, Marcos; Wille, Eric

    2016-07-01

    A new X-ray parallel beam facility (XPBF 2.0) has been installed in the laboratory of the Physikalisch-Technische Bundesanstalt at the synchrotron radiation facility BESSY II in Berlin to characterize silicon pore optics (SPOs) for the future X-ray observatory ATHENA. As the existing XPBF which is operated since 2005, the new beamline provides a pencil beam of very low divergence, a vacuum chamber with a hexapod system for accurate positioning of the SPO to be investigated, and a vertically movable CCD-based camera system to register the direct and the reflected beam. In contrast to the existing beamline, a multilayer-coated toroidal mirror is used for beam monochromatization at 1.6 keV and collimation, enabling the use of beam sizes between about 100 μm and at least 5 mm. Thus the quality of individual pores as well as the focusing properties of large groups of pores can be investigated. The new beamline also features increased travel ranges for the hexapod to cope with larger SPOs and a sample to detector distance of 12 m corresponding to the envisaged focal length of ATHENA.

  12. Study of glass hydrometer calibration by hydrostatic weighting

    NASA Astrophysics Data System (ADS)

    Chen, Chaoyun; Wang, Jintao; Li, Zhihao; Zhang, Peiman

    2016-01-01

    Glass hydrometers are simple but effective instruments for measuring the density of liquids. Glass hydrometers calibration based on the Archimedes law, using silicon ring as a reference standard solid density, n-tridecane with density stability and low surface tension as the standard working liquid, based on hydrostatic weighing method designs a glass hydrometer calibration system. Glass hydrometer calibration system uses CCD image measurement system to align the scale of hydrometer and liquid surface, with positioning accuracy of 0.01 mm. Surface tension of the working liquid is measured by Whihemy plate. According to twice glass hydrometer weighing in the air and liquid can calculate the correction value of the current scale. In order to verify the validity of the principle of the hydrostatic weighing method of glass hydrometer calibration system, for measuring the density range of (770-790) kg/m3, with a resolution of 0.2 kg/m3 of hydrometer. The results of measurement compare with the Physikalisch-Technische Bundesanstalt(PTB) ,verifying the validity of the calibration system.

  13. Supplementary comparison EURAMET.L-S24 on involute gear standards

    NASA Astrophysics Data System (ADS)

    Kniel, K.; Chanthawong, N.; Eastman, N.; Frazer, R.; Kupko, V.; Osawa, S.; Xue, Z.

    2014-01-01

    At its meeting in 2007, the EURAMET TC-Length decided to run an intercomparison of involute gear standards as a regional comparison with non-European involvement. The Physikalisch-Technische Bundesanstalt, Braunschweig und Berlin, Germany (PTB) was identified as the pilot laboratory, responsible for planning, organizing and analyzing the comparison. In all, seven participants from China, Germany, Japan, Thailand, Ukraine, United Kingdom and USA were asked to measure three different gear standards specialized for profile, helix and pitch measurements. The measurements started mid 2008 and were finished at the end of 2010. Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The comparison was registered as the supplementary comparison EURAMET.L-S24. The final report has been peer-reviewed and approved for publication by the CCL WG-MRA, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

  14. Standard conforming involute gear metrology using an articulated arm coordinate measuring system

    NASA Astrophysics Data System (ADS)

    Härtig, Frank; Lin, Hu; Kniel, Karin; Shi, Zhaoyao

    2012-10-01

    Standard conforming involute gear measurements were taken by a manually operating articulated arm system and the respective task-specific measurement uncertainties were estimated. User-friendly templates were developed to provide almost unambiguous and repeatable measurement results. They allow the metrologist to easily detect and gather the single measurement points according to existing guidelines and standards commonly used in gear metrology. The research activities were carried out at the Physikalisch-Technische Bundesanstalt (PTB), Germany in the Department of Coordinate Metrology. Measurements were taken on a robust and highly accurate large gear measurement standard of PTB, in the following called the gear standard. This gear standard materializes a left-hand and a right-hand gear as well as a spur gear. The 1 m outside diameter of the gear standard is similar to the gears used in wind power plants. A commercial articulated arm coordinate measuring system was used for the measurements. A high temperature stability of ±0.2 °C was provided to minimize thermal influences. The results of profile and helix measurements will be presented. This worldwide first investigation, on the basis of a calibrated involute gear standard, gives users of the articulating arm system quantitative information on a task-specific performance of a representative gear measurement.

  15. A novel instrument for quantitative nanoanalytics involving complementary X-ray methodologies

    SciTech Connect

    Lubeck, J.; Beckhoff, B.; Fliegauf, R.; Holfelder, I.; Hoenicke, P.; Mueller, M.; Pollakowski, B.; Reinhardt, F.; Weser, J.

    2013-04-15

    A novel ultra-high vacuum instrument for X-ray reflectometry and spectrometry-related techniques for nanoanalytics by means of synchrotron radiation has been constructed and commissioned. This versatile instrument was developed by the Physikalisch-Technische Bundesanstalt, Germany's national metrology institute, and includes a 9-axis manipulator that allows for an independent alignment of the samples with respect to all degrees of freedom. In addition, a rotational and translational movement of several photodiodes as well as a translational movement of an aperture system in and out of the beam is provided. Thus, the new instrument enables various analytical techniques based on energy dispersive X-ray detectors such as reference-free X-ray fluorescence analysis (XRF), total-reflection XRF, grazing-incidence XRF in addition to optional X-ray reflectometry measurements or polarization-dependent X-ray absorption fine structure analyses. With this instrument samples having a size of up to 100 mm Multiplication-Sign 100 mm can be analyzed with respect to their mass deposition, elemental or spatial composition, or the species in order to probe surface contamination, layer composition and thickness, the depth profile of matrix elements or implants, the species of nanolayers, nanoparticles or buried interfaces as well as the molecular orientation of bonds. Selected applications of this advanced ultra-high vacuum instrument demonstrate both its flexibility and capability.

  16. Feasibility Study for an Active 238UF6 Gas Target for Photo-Fission Experiments

    NASA Astrophysics Data System (ADS)

    Freudenberger, M.; Eckardt, C.; Göök, A.; Enders, J.; Hehner, J.; von Neumann-Cosel, P.; Oberstedt, A.; Oberstedt, S.; Simon, H.

    A series of fission experiments in the actinide region has been started at the superconducting Darmstadt linear accelerator S-DALINAC. For detailed investigations on, e.g., the energy dependence of fission modes, the population of fission isomers, or even the search for parity non-conservation effects (PNC) in the photon-induced fission process of 238U, high luminosities are needed. Increasing target thickness reduces mass and angular resolutions. One possible solution is the utilization of an active gas target containing UF6. In order to test UF6 as an admixture to standard counting gases (e.g. argon) and to study its properties, an ionization chamber has been built at Technische Universität Darmstadt. After testing the chamber with pure argon as a counting gas to evaluate signal quality and to determine the drift velocity, gaseous UF6 was filled into the chamber in steps of one mass-percent uranium for each measurement, where both signal quality and drift velocity at different admixtures have been determined. Up to two percent of uranium in the counting gas one finds that the drift velocity increases with UF6 content, while overall a good signal quality and energy resolution of the ionization chamber is preserved.

  17. The environment-pathogen-host axis in communicable and non-communicable diseases: recent advances in experimental and clinical research.

    PubMed

    Gilles, Stefanie; Traidl-Hoffmann, Claudia

    2014-05-01

    Allergies and autoimmune diseases are spreading worldwide. Control of infections, on the other hand, remains an issue, even in the post-antibiotic era. Chronic or poorly controlled infections occur in immune compromised individuals such as HIV patients, hospitalized patients exposed to multi-resistant bacteria, or patients on immunosuppressive treatment. They may become an even more emerging issue in an ageing population. At the same time, profound environmental changes such as global warming, urbanization, increasing environmental pollution and novel food engineering technologies may alter the abundance or aggressiveness of allergens/allergen carriers in our environment. Likewise, changes in dietary habits - and possibly also use of antibiotics - have an impact on the composition of our natural microbial flora in the gut, airways and skin, which may alter susceptibility for common diseases, among them allergies, asthma and atopic eczema. At the recently founded Institute of Environmental Medicine of the Technische Universität Munich, located in Augsburg at the UNIKA-T, experimental, clinical and translational research is focused on the complex interactions of environment, pathogen and host in expression or control of communicable and non-communicable diseases. We present our research concept and recent findings in environment - host interactions.

  18. PREFACE: International Conference on Topics in Astroparticle and Underground Physics (TAUP 2011)

    NASA Astrophysics Data System (ADS)

    Oberauer, Lothar; Raffelt, Georg; Wagner, Robert

    2012-07-01

    'Tor Vergata' K DanzmannMax Planck Institute for Gravitational Physics S DodelsonFermilab G DomogatskyINR Moscow E FioriniUniversità di Milano Bicocca & INFN K FreeseUniversity of Michigan M FukugitaICRR Tokyo T GaisserUniversity of Delaware G GerbierCEA Saclay F HalzenUniversity of Wisconsin W HaxtonLNBL & UC Berkeley J HoughGlasgow University E KomatsuUniversity of Texas E KatsavounidisMassachusetts Institute of Technology M LindnerMax Planck Institute for Nuclear Physics K LeskoLBNL & UC Berkeley A McDonaldQueens University & SNO Laboratory H MurayamaIPMU Tokyo & UC Berkeley A OlintoUniversity of Chicago L ResvanisUniversity of Athens A RubbiaETH Zurich S SarkarUniversity of Oxford A SmirnovICTP Trieste N SmithSNO Laboratory C SpieringDESY Zeuthen N SpoonerUniversity of Sheffield Y SuzukiICRR Tokyo M TeshimaMax Planck Institute for Physics J W F ValleIFIC & University of Valencia L VotanoLNGS E WaxmanWeizmann Institute J WilkersonUniversity of North Carolina TAUP Steering Committee F T AvignoneUniversity of South Carolina B C BarishCaltech E BellottiUniversity of Milan Bicoccia & INFN J BernabeuUniversity of Valencia A BottinoUniversity of Turin & INFN (chair) N FornengoUniversity of Turin & INFN T KajitaICRR Tokyo C W KimJohns Hopkins University & KIAS V MatveevINR Moscow G RaffeltMax Planck Institute for Physics D SinclairUniversity of Carleton M SpiroCEA Saclay Parallel Session Conveners Dark Matter - Candidates and Searches J-C LanfranchiTechnische Universität München T Marrodán UndagoitiaUniversity of Zurich T BringmannUniversität Hamburg Cosmology J WellerLudwig-Maximilians-Universität München S HannestadUniversity of Aarhus Double Beta Decay, Neutrino Mass M HirschIFIC/CSIC - University of Valencia A GiulianiCNRS Orsay Neutrino Oscillations T LachenmaierUniversität Tübingen F SuekaneTohoku University Low-Energy Neutrinos (Geo, Solar, Supernova) A DigheTIFR Mumbai M ChenQueen's University M WurmUniversität Hamburg Gravitational Waves E Coccia

  19. Development and evaluation of thermal model reduction algorithms for spacecraft

    NASA Astrophysics Data System (ADS)

    Deiml, Michael; Suderland, Martin; Reiss, Philipp; Czupalla, Markus

    2015-05-01

    This paper is concerned with the topic of the reduction of thermal models of spacecraft. The work presented here has been conducted in cooperation with the company OHB AG, formerly Kayser-Threde GmbH, and the Institute of Astronautics at Technische Universität München with the goal to shorten and automatize the time-consuming and manual process of thermal model reduction. The reduction of thermal models can be divided into the simplification of the geometry model for calculation of external heat flows and radiative couplings and into the reduction of the underlying mathematical model. For simplification a method has been developed which approximates the reduced geometry model with the help of an optimization algorithm. Different linear and nonlinear model reduction techniques have been evaluated for their applicability in reduction of the mathematical model. Thereby the compatibility with the thermal analysis tool ESATAN-TMS is of major concern, which restricts the useful application of these methods. Additional model reduction methods have been developed, which account to these constraints. The Matrix Reduction method allows the approximation of the differential equation to reference values exactly expect for numerical errors. The summation method enables a useful, applicable reduction of thermal models that can be used in industry. In this work a framework for model reduction of thermal models has been created, which can be used together with a newly developed graphical user interface for the reduction of thermal models in industry.

  20. EDITORIAL: Microflow meets metrology Microflow meets metrology

    NASA Astrophysics Data System (ADS)

    Wolf, Henning

    2010-07-01

    This special feature is dedicated to methods and applications of high-precision flow rate measurements at flow rates in the range of µl/min and below. It comprises papers from authors who gave lectures at the 250th PTB Seminar 'European Meeting on Microflow Metrology', held at the Physikalisch-Technische Bundesanstalt, Germany, on 24-25 June 2009 and sponsored by the Helmholtz Funds e.V., Germany. More than 40 experts from national metrology institutes, universities and manufactures of flowmeters, and from seven European countries, attended the seminar. The main goal of the seminar was to discuss the measurement of very small flow rates on a metrological basis. The lectures covered measurements of flow rates of liquids as well as of gases. Manufacturers discussed their developments of commercial flowmeters for low flow rates, and first approaches towards a measurement traceable to the SI were introduced by the national metrology institutes. Thus, many interesting discussions were stimulated between various groups, in particular between those working in metrology and on applications. The measurement of very low flow rates traceable to the SI is just beginning. So many approaches have not yet been finished or are at the moment only at the status of a proof of principle. The papers in this special feature give an insight into these different approaches and mark the beginning of an exciting way towards the measurement of small and ultrasmall flow rates.

  1. Organizational responses to a changing aid environment: the German Agency for Technical Cooperation (GTZ).

    PubMed

    Hill, Peter S

    2002-01-01

    As a major European donor, German government development assistance faces a series of challenges. Recent political changes have raised expectations for demonstrable health outcomes as a result of German development assistance; there has been a deepened commitment to collaboration with other bilateral and multilateral donors; and partner countries are increasingly open to new approaches to development. German development assistance also reflects a new ethos of partnership and the shift to programmatic and sector based development approaches. At the same time, its particular organizational structure and administrative framework highlight the extent of structural and systems reforms required of donors by changing development relationships, and the tensions created in responding to these. This paper examines organizational changes within the German Agency for Technical Cooperation (Deutsche Gesellschaft für Technische, Zusammenarbeit) (GTZ), aimed at increasing its Regional, Sectoral, Managerial and Process competence as they affect health and related sectors. These include the decentralization of GTZ, the trend to integration of projects, the increasing focus on policy and health systems reform, increased inter-sectoral collaboration, changes in recruitment and training, new perspectives in planning and evaluation and the introduction of a quality management programme.

  2. Establishing an optimized patient-specific verification program for volumetric modulated arc therapy

    SciTech Connect

    Serna, Alfredo; Mata, Fernando; Puchades, Vicente

    2013-10-01

    Quality assurance (QA) of volumetric modulated arc therapy (VMAT) increases the workload significantly. We compared the results from 4 verification methods to establish an efficient VMAT QA. Planning for VMAT treatments was carried out for 40 consecutive patients. Pretreatment verifications were carried out with ion chamber array Physikalish-Technische Werkstätten (PTW729), electronic portal dosimetry (EPID), ion chamber measurements, and independent dose calculation with Diamond program. 2D analyses were made using the gamma analysis (3 mm distance to agreement and 3% dose difference relative to maximum, 10% dose threshold). Average point dose difference calculated by Eclipse relative to ion chamber measurements and Diamond were 0.1%±0.9% and 0.6%±2.2%, respectively. Average pass rate for PTW729 was 99.2%±1.9% and 98.3%±1.3% for EPID. The total required time (linac occupancy time given in parentheses) for each QA method was: PTW729 43.5 minutes (26.5 minutes), EPID 14.5 minutes (2.5 minutes), ion chamber 34.5 minutes (26.5 minutes), and Diamond 12.0 minutes (0 minute). The results were consistent and allowed us to establish an optimized protocol, considering safety and accuracy as well as workload, consisting of 2 verification methods: EPID 2D analysis and independent dose calculation.

  3. Radiometric calibration of the telescope and ultraviolet spectrometer SUMER on SOHO

    NASA Astrophysics Data System (ADS)

    Hollandt, Jörg; Schühle, Udo; Paustian, Wolfgang; Curdt, Werner; Kühne, Michael; Wende, Burkhard; Wilhelm, Klaus

    1996-09-01

    The prelaunch spectral-sensitivity calibration of the solar spectrometer SUMER (Solar Ultraviolet Measurements of Emitted Radiation) is described. SUMER is part of the payload of the Solar and Heliospheric Observatory (SOHO), which begins its scientific mission in 1996. The instrument consists of a telescope and a spectrometer capable of taking spatially and spectrally highly resolved images of the Sun in a spectral range from 50 to 161 nm. The pointing capabilities, the dynamic range, and the sensitivity of the instrument allow measurements both on the solar disk and above the limb as great as two solar radii. To determine plasma temperatures and densities in the solar atmosphere, the instrument needs an absolute spectral-sensitivity calibration. Here we describe the prelaunch calibration of the full instrument, which utilizes a radiometric transfer-standard source. The transfer standard was based on a high-current hollow-cathode discharge source. It had been calibrated in the laboratory for vacuum UV radiometry of the Physikalisch-Technische Bundesanstalt by use of the calculable spectral photon flux of the Berlin electron storage ring for synchrotron radiation (BESSY)-a primary radiometric source standard.

  4. Evaluation of a digital data acquisition system and optimization of n-{gamma} discrimination for a compact neutron spectrometer

    SciTech Connect

    Giacomelli, L.; Zimbal, A.; Reginatto, M.; Tittelmeier, K.

    2011-01-15

    A compact NE213 liquid scintillation neutron spectrometer with a new digital data acquisition (DAQ) system is now in operation at the Physikalisch-Technische Bundesanstalt (PTB). With the DAQ system, developed by ENEA Frascati, neutron spectrometry with high count rates in the order of 5x10{sup 5} s{sup -1} is possible, roughly an order of magnitude higher than with an analog acquisition system. To validate the DAQ system, a new data analysis code was developed and tests were done using measurements with 14-MeV neutrons made at the PTB accelerator. Additional analysis was carried out to optimize the two-gate method used for neutron and gamma (n-{gamma}) discrimination. The best results were obtained with gates of 35 ns and 80 ns. This indicates that the fast and medium decay time components of the NE213 light emission are the ones that are relevant for n-{gamma} discrimination with the digital acquisition system. This differs from what is normally implemented in the analog pulse shape discrimination modules, namely, the fast and long decay emissions of the scintillating light.

  5. Konrad Repository Facing its Construction

    SciTech Connect

    Kunze, V.

    2008-07-01

    According to the German Atomic Energy Act the Federation is responsible for the construction and operation of installations for the safekeeping and disposal of radioactive waste. This duty was assigned to the Federal Office for Radiation Protection (Bundesamt fuer Strahlenschutz - BfS). In 1982, the Federal Institute of Physics and Metrology (Physikalisch Technische Bundesanstalt - PTB) as the precursor of BfS applied for a license for the disposal of radioactive waste with negligible heat generation in the Konrad iron ore mine near Salzgitter at the Ministry for Environment of Lower Saxony. After 25 years of plan approval procedure and subsequent lawsuits the license is now valid and Konrad is waiting for construction. Facing this challenge BfS has established a project team to supervise the in-house and external activities to be done. It is intended to construct the Konrad repository within a preparation period of two years and a subsequent erection phase of four years. Thus, Konrad is planned to come into operation in 2013. In this paper the development of the plan approval procedure, the technical design of the planned repository, especially with regard to safety-related aspects, and the planning for the construction will be discussed. (authors)

  6. ARGon{sup 3}: ''3D appearance robot-based gonioreflectometer'' at PTB

    SciTech Connect

    Hoepe, A.; Atamas, T.; Huenerhoff, D.; Teichert, S.; Hauer, K.-O.

    2012-04-15

    At the Physikalisch-Technische Bundesanstalt, the National Metrology Institute of Germany, a new facility for measuring visual appearance-related quantities has been built up. The acronym ARGon{sup 3} stands for ''3D appearance robot-based gonioreflectometer''. Compared to standard gonioreflectometers, there are two main new features within this setup. First, a photometric luminance camera with a spatial resolution of 28 {mu}m on the device under test (DUT) enables spatially high-resolved measurements of luminance and color coordinates. Second, a line-scan CCD-camera mounted to a spectrometer provides measurements of the radiance factor, respectively the bidirectional reflectance distribution function, in full V({lambda})-range (360 nm-830 nm) with arbitrary angles of irradiation and detection relative to the surface normal, on a time scale of about 2 min. First goniometric measurements of diffuse reflection within 3D-space above the DUT with subsequent colorimetric representation of the obtained data of special effect pigments based on the interference effect are presented.

  7. Oral histories in meteoritics and planetary science - XXII: John T. Wasson

    NASA Astrophysics Data System (ADS)

    Sears, Derek W. G.

    2014-04-01

    In this interview, John Wasson (Fig. 1) describes his childhood and undergraduate years in Arkansas and his desire to pursue nuclear chemistry as a graduate student at MIT. Upon graduation, John spent time in Munich (Technische Hochschule), the Air Force Labs in Cambridge, MA, and a sabbatical at the University of Bern where he developed his interests in meteorites. Upon obtaining his faculty position at UCLA, John established a neutron activation laboratory and began a long series of projects on the bulk compositions of iron meteorites and chondrites. He developed the chemical classification scheme for iron meteorites, gathered a huge set of iron meteorite compositional data with resultant insights into their formation, and documented the refractory and moderately volatile element trends that characterize the chondrites and chondrules. He also spent several years studying field relations and compositions of layered tektites from Southeast Asia, proposing an origin by radiant heating from a mega-Tunguska explosion. Recently, John has explored oxygen isotope patterns in meteorites and their constituents believing the oxygen isotope results to be some of the most important discoveries in cosmochemistry. John also describes the role of postdoctoral colleagues and their important work, his efforts in the reorganization and modernization of the Meteoritical Society, his contributions in reshaping the journal Meteoritics, and how, with UCLA colleagues, he organized two meetings of the society. John Wasson earned the Leonard Medal of the Meteoritical Society in 1992 and the J. Lawrence Smith Medal of the National Academy in 2003.

  8. Report of pilot study CCM.P-P1 for international comparison of absolute pressure measurements in gas from 3 × 10-9 Pa to 9 × 10-4 Pa

    NASA Astrophysics Data System (ADS)

    Yoshida, Hajime; Arai, Kenta; Komatsu, Eiichi; Fujii, Kenichi; Bock, Thomas; Jousten, Karl

    2015-01-01

    A bilateral comparison of absolute gas pressure measurements from 3 × 10-9 Pa to 9 × 10-4 Pa was performed between the National Metrology Institute of Japan (NMIJ) and Physikalisch-Technische Bundesanstalt (PTB). It is a pilot study CCM.P-P1 for the next international comparison in this pressure range to test the stability of ultrahigh vacuum gauges (UHV gauges) as transfer standards. Two spinning rotor gauges (SRGs), an axial-symmetric transmission gauge (ATG), and an extractor gauge (EXG) were used as transfer standards. The calibration ratio of one SRG was sufficiently stable, but the other was not. This result indicates that improvements in the transport mechanism for SRG are needed. The two ionization gauges ATG and EXG, on the other hand, were sufficiently stable. Provisional equivalence of the pressures realized by the primary standards at NMIJ and PTB was found. Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by CCM-WGS.

  9. Final report on bilateral supplementary comparison APMP.M.P-S5 in hydraulic gauge pressure from 1 MPa to 10 MPa

    NASA Astrophysics Data System (ADS)

    Yue, J.; Yang, Y.; Sabuga, W.

    2016-01-01

    This report summarizes the results of the Asia-Pacific Metrology Programme (APMP) supplementary comparison APMP.M.P-S5 for hydraulic gauge pressure in the range of 1 MPa to 10 MPa, which is a bilateral comparison carried out at the National Institute of Metrology, China (NIM) and the Physikalisch-Technische Bundesanstalt, Germany (PTB) during the period June 2014 to June 2015. NIM piloted the comparison and provided the transfer standard, which was a piston-cylinder assembly (PCA) of 1 cm2 nominal effective area built in a hydraulic pressure balance manufactured by Fluke Corporation. The laboratory standards of NIM and PTB are both hydraulic pressure balances equipped with PCAs, of which the nominal effective area is 1 cm2 for NIM and 5 cm2 for PTB. The results of the comparison successfully demonstrated that the hydraulic gauge pressure standards of NIM and PTB in the range of 1 MPa to 10 MPa are equivalent within their claimed uncertainties. Main text To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

  10. Concentrations of iodine isotopes ((129)I and (127)I) and their isotopic ratios in aerosol samples from Northern Germany.

    PubMed

    Daraoui, A; Riebe, B; Walther, C; Wershofen, H; Schlosser, C; Vockenhuber, C; Synal, H-A

    2016-04-01

    New data about (129)I, (127)I concentrations and their isotopic ratios in aerosol samples from the trace survey station of the Physikalisch-Technische Bundesanstalt (PTB) in Braunschweig, Northern Germany, are presented and discussed in this paper. The investigated samples were collected on a weekly basis during the years 2011 to 2013. Iodine was extracted from aerosol filters using a strong basic solution and was separated from the matrix elements with chloroform and was analysed by accelerator mass spectrometry (AMS) for (129)I and by inductively coupled plasma mass spectrometry (ICP-MS) for (127)I. The concentrations of (127)I and (129)I in aerosol filters ranged from 0.31 to 3.71 ng m(-3) and from 0.06 to 0.75 fg m(-3), respectively. The results of (129)I/(127)I isotopic ratios were in the order 10(-8) to 10(-7). The (129)I originated directly from gaseous emissions and indirectly from liquid emissions (via sea spray) from the reprocessing plants in Sellafield and La Hague. In comparison with the results of (131)I after the Fukushima accident, no contribution of (129)I from this accident was detectable in Central Europe due to the high background originating from the (129)I releases of the European reprocessing plants. (129)I atmospheric activity concentrations were compared with those of an anthropogenic radionuclide ((85)Kr). We did not find any correlation between (129)I and (85)Kr, both having nuclear reprocessing plant as the main source.

  11. Microsurgical skills training with a new tympanoplasty model: learning curve and motivational impact.

    PubMed

    Neudert, Marcus; Kluge, Anne; Beleites, Thomas; Kemper, Max; Zahnert, Thomas

    2012-04-01

    To evaluate the microsurgical skills training on a tympanoplasty model with regard to the learning curve and the participants' motivation for a surgical specialty. Randomized controlled prospective study. Department of Otolaryngology, Head and Neck Surgery, Medical Campus Carl Gustav Carus at the Technische Universität Dresden, Germany. Thirty randomly chosen fifth-year medical students divided into 2 groups. Group 2 (n = 16) had to perform an ossicular and tympanic membrane reconstruction on a tympanoplasty model on Days 1, 7, 14, and 21 and Group 1 (n = 14) on Days 1 and 21, while observing the procedure at Days 7 and 14. Six otosurgeons served as gold standard. Attempts and time of prosthesis placement and time for tympanic membrane reconstruction were recorded. Tremor frequency and amplitude were obtained at the same time points. An adjusted study interest questionnaire was used to assess students' motivation. Students in Group 2 showed a significant improvement in all reconstruction parameters over the study period compared with both, baseline measurement on first day and Group 1. However, the obtained learning curve did not reach the experts level. Tremor indices and students' motivation showed no correlation with the reconstruction parameters, whereas the training itself had a positive impact on students' interest in the surgical specialty. Training with the tympanoplasty model is suitable to acquire first microsurgical motor skills in otolaryngology and to arouse students' interest in the surgical field and otorhinolaryngology.

  12. Radiopurity of CaWO{sub 4} crystals for direct dark matter search with CRESST and EURECA

    SciTech Connect

    Münster, A.; Sivers, M. v.; Erb, A.; Feilitzsch, F. v.; Gütlein, A.; Lanfranchi, J.-C.; Potzel, W.; Angloher, G.; Bento, A.; Hauff, D.; Petricca, F.; Pröbst, F.; Bucci, C.; Canonica, L.; Gorla, P.; Laubenstein, M.; Jochum, J.; Loebell, J.; Kraus, H.; Ortigoza, Y. E-mail: msivers@ph.tum.de; and others

    2014-05-01

    The direct dark matter search experiment CRESST uses scintillating CaWO{sub 4} single crystals as targets for possible WIMP scatterings. An intrinsic radioactive contamination of the crystals as low as possible is crucial for the sensitivity of the detectors. In the past CaWO{sub 4} crystals operated in CRESST were produced by institutes in Russia and the Ukraine. Since 2011 CaWO{sub 4} crystals have also been grown at the crystal laboratory of the Technische Universität München (TUM) to better meet the requirements of CRESST and of the future tonne-scale multi-material experiment EURECA. The radiopurity of the raw materials and of first TUM-grown crystals was measured by ultra-low background γ-spectrometry. Two TUM-grown crystals were also operated as low-temperature detectors at a test setup in the Gran Sasso underground laboratory. These measurements were used to determine the crystals' intrinsic α-activities which were compared to those of crystals produced at other institutes. The total α-activities of TUM-grown crystals as low as 1.23±0.06 mBq/kg were found to be significantly smaller than the activities of crystals grown at other institutes typically ranging between ∼ 15 mBq/kg and ∼ 35 mBq/kg.

  13. Electromagnetic DM technology meets future AO demands

    NASA Astrophysics Data System (ADS)

    Hamelinck, Roger; Rosielle, Nick; Steinbuch, Maarten; Doelman, Niek

    New deformable mirror technology is developed by the Technische Universiteit Eindhoven, Delft University of Technology and TNO Science and Industry. Several prototype adaptive deformable mirrors are realized mirrors, up to 427 actuators and ∅150mm diameter, with characteristics suitable for future AO systems. The prototypes consist of a 100µm thick, continuous facesheet on which low voltage, electromagnetic, push-pull actuators impose out-of-plane displacements. The variable reluctance actuators with ±10µm stroke and nanometer resolution are located in a standard actuator module. Each module with 61 actuators connects to a single PCB with dedicated, 16 bit, PWM based, drivers. A LVDS multi-drop cable connects up to 32 actuator modules. With the actuator module, accompanying PCB and multi-drop system the deformable mirror technology is made modular in its mechanics and electronics. An Ethernet-LVDS bridge enables any commercial PC to control the mirror using the UDP standard. Latest results of the deformable mirror technology development are presented.

  14. Shannon's Energy Based Algorithm in ECG Signal Processing.

    PubMed

    Beyramienanlou, Hamed; Lotfivand, Nasser

    2017-01-01

    Physikalisch-Technische Bundesanstalt (PTB) database is electrocardiograms (ECGs) set from healthy volunteers and patients with different heart diseases. PTB is provided for research and teaching purposes by National Metrology Institute of Germany. The analysis method of complex QRS in ECG signals for diagnosis of heart disease is extremely important. In this article, a method on Shannon energy (SE) in order to detect QRS complex in 12 leads of ECG signal is provided. At first, this algorithm computes the Shannon energy (SE) and then makes an envelope of Shannon energy (SE) by using the defined threshold. Then, the signal peaks are determined. The efficiency of the algorithm is tested on 70 cases. Of all 12 standard leads, ECG signals include 840 leads of the PTB Diagnostic ECG Database (PTBDB). The algorithm shows that the Shannon energy (SE) sensitivity is equal to 99.924%, the detection error rate (DER) is equal to 0.155%, Positive Predictivity (+P) is equal to 99.922%, and Classification Accuracy (Acc) is equal to 99.846%.

  15. Establishing an optimized patient-specific verification program for volumetric modulated arc therapy.

    PubMed

    Serna, Alfredo; Mata, Fernando; Puchades, Vicente

    2013-01-01

    Quality assurance (QA) of volumetric modulated arc therapy (VMAT) increases the workload significantly. We compared the results from 4 verification methods to establish an efficient VMAT QA. Planning for VMAT treatments was carried out for 40 consecutive patients. Pretreatment verifications were carried out with ion chamber array Physikalish-Technische Werkstätten (PTW729), electronic portal dosimetry (EPID), ion chamber measurements, and independent dose calculation with Diamond program. 2D analyses were made using the gamma analysis (3mm distance to agreement and 3% dose difference relative to maximum, 10% dose threshold). Average point dose difference calculated by Eclipse relative to ion chamber measurements and Diamond were 0.1%±0.9% and 0.6%±2.2%, respectively. Average pass rate for PTW729 was 99.2%±1.9% and 98.3%±1.3% for EPID. The total required time (linac occupancy time given in parentheses) for each QA method was: PTW729 43.5 minutes (26.5 minutes), EPID 14.5 minutes (2.5 minutes), ion chamber 34.5 minutes (26.5 minutes), and Diamond 12.0 minutes (0 minute). The results were consistent and allowed us to establish an optimized protocol, considering safety and accuracy as well as workload, consisting of 2 verification methods: EPID 2D analysis and independent dose calculation.

  16. Lessons learnt from an international intercomparison of national network systems used to provide early warning of a nuclear accident.

    PubMed

    Sáez-Vergara, J C; Thompson, I M G; Funck, E; Andersen, C E; Neumaier, S; Bøtter-Jensen, L

    2003-01-01

    As part of the European Research Council's Fourth Framework Programme, the EURADOS Action Group on Monitoring of External Exposures held an intercomparison of national network systems. This took place during May/June 1999 at the Risø Natural Enviromental Radiation Measurement Station in Denmark and at the Underground Laboratory for Dosimetry and Spectrometry (UDO) of the Physikalisch-Technische Bundesanstalt (PTB) in Germany. The network systems are used continuously to monitor radiation levels throughout a country in order to give early warning of nuclear accidents having transboundary implications. The radiation levels measured are used to estimate the radiation risks to people arising from the accident. Seven European countries participated in the intercomparison with detector systems used in their national network systems as well as with detectors being developed for future use. Since different radiation quantities were measured by the systems (namely exposure, air kerma and ambient dose equivalent), the initial analysis of the intercomparison results was made in terms of the quantity air kerma rate. This report completes the analysis of the results and these are given in terms of air kerma rate in order to be consistent with the preliminary report. In addition, in some cases the results are also given in terms of the quantity measured by each national network system. The experience gained from this intercomparison is used to help organise a follow-up intercomparison to be held at the PTB Braunschweig in September 2002 and in which a further seven or eight countries from Europe will participate.

  17. Non-invasive experimental determination of a CT source model.

    PubMed

    Alikhani, Babak; Büermann, Ludwig

    2016-01-01

    Non-invasive methods to determine equivalent X-ray source models of a CT scanner are presented. A high-precision technique called TRIC ("Time Resolved Integrated Charge") was developed and used to characterize the bow tie filters (BT) of the CT scanner installed at Physikalisch-Technische Bundesanstalt (PTB). Aluminum (Al) and polymethyl methacrylate (PMMA) equivalent thicknesses of the BT filters at all tube high voltages were evaluated, assuming that those consist of only one material. Thereby two different dose probes were used, a solid state detector and an ionization chamber, the former characterized by a significant and the latter by an almost negligible energy dependence of the air kerma response. A method was developed to correct for the energy dependence of the solid state dose probe. Next, a two-component material was assumed and equivalent BT filters were evaluated. The latter method was also applied using the known real BT filter materials and compared with the shape of the real BT filters. Finally, the results obtained by the TRIC method were compared with those obtained by using the so-called COBRA method ("Characterization Of Bow tie Relative Attenuation"), the latter being more suitable for measurements in a clinical environment. Copyright © 2015 Associazione Italiana di Fisica Medica. Published by Elsevier Ltd. All rights reserved.

  18. Next generation KATRIN high precision voltage divider for voltages up to 65kV

    NASA Astrophysics Data System (ADS)

    Bauer, S.; Berendes, R.; Hochschulz, F.; Ortjohann, H.-W.; Rosendahl, S.; Thümmler, T.; Schmidt, M.; Weinheimer, C.

    2013-10-01

    The KATRIN (KArlsruhe TRItium Neutrino) experiment aims to determine the mass of the electron antineutrino with a sensitivity of 200 meV by precisely measuring the electron spectrum of the tritium beta decay. This will be done by the use of a retarding spectrometer of the MAC-E-Filter type. To achieve the desired sensitivity the stability of the retarding potential of -18.6 kV has to be monitored with a precision of 3 ppm over at least two months. Since this is not feasible with commercial devices, two ppm-class high voltage dividers were developed, following the concept of the standard divider for DC voltages of up to 100 kV of the Physikalisch-Technische Bundesanstalt (PTB). In order to reach such high accuracies different effects have to be considered. The two most important ones are the temperature dependence of resistance and leakage currents, caused by insulators or corona discharges. For the second divider improvements were made concerning the high-precision resistors and the thermal design of the divider. The improved resistors are the result of a cooperation with the manufacturer. The design improvements, the investigation and the selection of the resistors, the built-in ripple probe and the calibrations at PTB will be reported here. The latter demonstrated a stability of about 0.1 ppm/month over a period of two years.

  19. Neutron induced fission cross section measurements of 240Pu and 242Pu

    NASA Astrophysics Data System (ADS)

    Belloni, F.; Eykens, R.; Heyse, J.; Matei, C.; Moens, A.; Nolte, R.; Plompen, A. J. M.; Richter, S.; Sibbens, G.; Vanleeuw, D.; Wynants, R.

    2017-09-01

    Accurate neutron induced fission cross section of 240Pu and 242Pu are required in view of making nuclear technology safer and more efficient to meet the upcoming needs for the future generation of nuclear power plants (GEN-IV). The probability for a neutron to induce such reactions figures in the NEA Nuclear Data High Priority Request List [1]. A measurement campaign to determine neutron induced fission cross sections of 240Pu and 242Pu at 2.51 MeV and 14.83 MeV has been carried out at the 3.7 MV Van De Graaff linear accelerator at Physikalisch-Technische Bundesanstalt (PTB) in Braunschweig. Two identical Frisch Grid fission chambers, housing back to back a 238U and a APu target (A = 240 or A = 242), were employed to detect the total fission yield. The targets were molecular plated on 0.25 mm aluminium foils kept at ground potential and the employed gas was P10. The neutron fluence was measured with the proton recoil telescope (T1), which is the German primary standard for neutron fluence measurements. The two measurements were related using a De Pangher long counter and the charge as monitors. The experimental results have an average uncertainty of 3-4% at 2.51 MeV and for 6-8% at 14.81 MeV and have been compared to the data available in literature.

  20. Dosimetry of environmental radiation--a report on the achievements of EURADOS WG3.

    PubMed

    Wissmann, F; Sáez Vergara, J C

    2006-01-01

    Owing to the fact that a nuclear accident is a border-crossing problem, all national active monitoring systems should measure the same quantity with a comparable level of precision. Also, the sensitivity of the systems must be such that sudden changes in the environmental dose rate are recognised and a radiological incident is clearly identified. Thus, international intercomparisons of the so-called Early Warning Systems are the best method to assure high quality measurements. Supported by the European Commission within the scope of the 4th and 5th Framework Programmes, intercomparisons of these Early Warning Systems were organised by European Radiation Dosimetry (EURADOS) Working Group 3 (WG3) in 1999 and 2002. The methods developed for this purpose are based on controlled irradiation of the systems and the determination of their responses to secondary cosmic radiation. One of the major problems turned out to be the correct subtraction of the internal background. Investigating this problem was only possible by carrying out measurements at almost zero dose rate, as available in the Underground Laboratory for Dosimetry and Spectrometry (UDO) maintained by Physikalisch-Technische Bundesanstalt. Progress was also achieved with regard to including in situ gamma spectroscopy systems in the 2002 intercomparison. For these systems, the UDO irradiation facility provides a unique possibility to measure the spectral responses to monoenergetic photons.

  1. ECG compression using non-recursive wavelet transform with quality control

    NASA Astrophysics Data System (ADS)

    Liu, Je-Hung; Hung, King-Chu; Wu, Tsung-Ching

    2016-09-01

    While wavelet-based electrocardiogram (ECG) data compression using scalar quantisation (SQ) yields excellent compression performance, a wavelet's SQ scheme, however, must select a set of multilevel quantisers for each quantisation process. As a result of the properties of multiple-to-one mapping, however, this scheme is not conducive for reconstruction error control. In order to address this problem, this paper presents a single-variable control SQ scheme able to guarantee the reconstruction quality of wavelet-based ECG data compression. Based on the reversible round-off non-recursive discrete periodised wavelet transform (RRO-NRDPWT), the SQ scheme is derived with a three-stage design process that first uses genetic algorithm (GA) for high compression ratio (CR), followed by a quadratic curve fitting for linear distortion control, and the third uses a fuzzy decision-making for minimising data dependency effect and selecting the optimal SQ. The two databases, Physikalisch-Technische Bundesanstalt (PTB) and Massachusetts Institute of Technology (MIT) arrhythmia, are used to evaluate quality control performance. Experimental results show that the design method guarantees a high compression performance SQ scheme with statistically linear distortion. This property can be independent of training data and can facilitate rapid error control.

  2. ZERODUR TAILORED for cryogenic application

    NASA Astrophysics Data System (ADS)

    Jedamzik, R.; Westerhoff, T.

    2014-07-01

    ZERODUR® glass ceramic from SCHOTT is known for its very low thermal expansion coefficient (CTE) at room temperature and its excellent CTE homogeneity. It is widely used for ground-based astronomical mirrors but also for satellite applications. Many reference application demonstrate the excellent and long lasting performance of ZERODUR® components in orbit. For space application a low CTE of the mirror material is required at cryogenic temperatures together with a good match of the thermal expansion to the supporting structure material. It is possible to optimize the coefficient of thermal expansion of ZERODUR® for cryogenic applications. This paper reports on measurements of thermal expansion of ZERODUR® down to cryogenic temperatures of 10 K performed by the PTB (Physikalisch Technische Bundesanstallt, Braunschweig, Germany, the national metrology laboratory). The ZERODUR® TAILORED CRYO presented in this paper has a very low coefficient of thermal expansion down to 70 K. The maximum absolute integrated thermal expansion down to 10 K is only about 20 ppm. Mirror blanks made from ZERODUR® TAILORED CRYO can be light weighted to almost 90% with our modern processing technologies. With ZERODUR® TAILORED CRYO, SCHOTT offers the mirror blank material for the next generation of space telescope applications.

  3. High-efficiency B₄C/Mo₂C alternate multilayer grating for monochromators in the photon energy range from 0.7 to 3.4 keV.

    PubMed

    Choueikani, Fadi; Lagarde, Bruno; Delmotte, Franck; Krumrey, Michael; Bridou, Françoise; Thomasset, Muriel; Meltchakov, Evgueni; Polack, François

    2014-04-01

    An alternate multilayer (AML) grating has been prepared by coating an ion etched lamellar grating with a B4C/Mo2C multilayer (ML) having a layer thickness close to the groove depth. Such a structure behaves as a 2D synthetic crystal and can reach very high efficiencies when the Bragg condition is satisfied. This AML coated grating has been characterized at the SOLEIL Metrology and Tests Beamline between 0.7 and 1.7 keV and at the four-crystal monochromator beamline of Physikalisch-Technische Bundesanstalt (PTB) at BESSY II between 1.75 and 3.4 keV. A peak diffraction efficiency of nearly 27% was measured at 2.2 keV. The measured efficiencies are well reproduced by numerical simulations made with the electromagnetic propagation code CARPEM. Such AML gratings, paired with a matched ML mirror, constitute efficient monochromators for intermediate energy photons. They will extend the accessible energy for many applications as x-ray absorption spectroscopy or x-ray magnetic circular dichroism experiments.

  4. Environment Characterisation by Using Innovative Debris Detector

    NASA Astrophysics Data System (ADS)

    Bauer, W.; Barschke, M.; Romberg, O.

    The knowledge about small (> 100 µm) but abundant objects in space is low. To analyze the quantity of space debris and micrometeoroids in space, an innovative in-situ impact detection method has been developed at the German Aerospace Center (DLR) in Bremen, Germany. The Solar generator based Impact Detector, SOLID, uses solar panels for impact detection. Since solar panels provide large detection areas, this method allows the collection of large amounts of data. Such data enhances space debris and micrometeoroid population datasets and permits for related model validation. A ground verification of the detection method has been performed by Hypervelocity Impact (HVI) tests at Fraunhofeŕs Ernst-Mach-Institut (EMI), Freiburg, Germany. The objective of this investigation was to test the applicability of the developed method concerning in-situ detection of space debris and micrometeoroids. The achieved test results are in agreement with ESA developed damage equations and the functionality of the detector has clearly been demonstrated. This paper presents the already manufactured hardware planned for on orbit test on the Technische Universität Berlin's TechnoSat mission in early 2016. The expected impact frequencies at corresponding probabilities and uncertainties regarding object size estimation are also outlined.

  5. First set of gated x-ray imaging diagnostics for the Laser Megajoule facility

    SciTech Connect

    Rosch, R.; Trosseille, C.; Caillaud, T.; Allouche, V.; Bourgade, J. L.; Briat, M.; Brunel, P.; Burillo, M.; Casner, A.; Depierreux, S.; Gontier, D.; Jadaud, J. P.; Le Breton, J. P.; Llavador, P.; Loupias, B.; Miquel, J. L.; Oudot, G.; Perez, S.; Raimbourg, J.; Rousseau, A.; and others

    2016-03-15

    The Laser Megajoule (LMJ) facility located at CEA/CESTA started to operate in the early 2014 with two quadruplets (20 kJ at 351 nm) focused on target for the first experimental campaign. We present here the first set of gated x-ray imaging (GXI) diagnostics implemented on LMJ since mid-2014. This set consists of two imaging diagnostics with spatial, temporal, and broadband spectral resolution. These diagnostics will give basic measurements, during the entire life of the facility, such as position, structure, and balance of beams, but they will also be used to characterize gas filled target implosion symmetry and timing, to study x-ray radiography and hydrodynamic instabilities. The design requires a vulnerability approach, because components will operate in a harsh environment induced by neutron fluxes, gamma rays, debris, and shrapnel. Grazing incidence x-ray microscopes are fielded as far as possible away from the target to minimize potential damage and signal noise due to these sources. These imaging diagnostics incorporate microscopes with large source-to-optic distance and large size gated microchannel plate detectors. Microscopes include optics with grazing incidence mirrors, pinholes, and refractive lenses. Spatial, temporal, and spectral performances have been measured on x-ray tubes and UV lasers at CEA-DIF and at Physikalisch-Technische Bundesanstalt BESSY II synchrotron prior to be set on LMJ. GXI-1 and GXI-2 designs, metrology, and first experiments on LMJ are presented here.

  6. Argan woodlands in South Morocco as an area of conflict between degradation and sustainable land use

    NASA Astrophysics Data System (ADS)

    Kirchhoff, Mario; Kagermeier, Andreas; Ries, Johannes B.

    2016-04-01

    The Argan woodlands are endemic for South Morocco and prone to degradation through expanding and intensifying agriculture and overgrazing. Unvegetated areas extend further due to degradation of soil and vegetation. Here infiltration is less than on vegetated areas, while runoff and soil erosion increase. The sale of the highly valuable oil, gained from the seeds of the argan tree, can be seen as an economic alternative for the region and a chance of survival for the argan woodlands. With the introduction of women's cooperatives for the production and sale of the oil, the Gesellschaft für Technische Zusammenarbeit (GTZ, Association for Technical Cooperation) hoped to halt argan degradation from 1995 to 2002. The effects of this approach shall be studied in a proposed DFG-project. The erosion gradient between soils under canopy cover and intertree areas in varying stages of degradation will be at the center of the analysis. Insight into onsite and offsite degradation shall be gained through the measurement of runoff and erosion rates, which lead to rill and gully erosion downslope. Measurements of soil chemical and physical properties might also help indicate when an argan woodland can be classified as natural. Furthermore to be studied are the effects of the new found value of the Argan woodlands among the local population with focus on regional tourism and a possible reduction of grazing pressure. Sustainable soil management in combination with the needs of the local population is essential for a sustainable land use in the region.

  7. The high-resolution extraterrestrial solar spectrum (QASUMEFTS) determined from ground-based solar irradiance measurements

    NASA Astrophysics Data System (ADS)

    Gröbner, Julian; Kröger, Ingo; Egli, Luca; Hülsen, Gregor; Riechelmann, Stefan; Sperfeld, Peter

    2017-09-01

    A high-resolution extraterrestrial solar spectrum has been determined from ground-based measurements of direct solar spectral irradiance (SSI) over the wavelength range from 300 to 500 nm using the Langley-plot technique. The measurements were obtained at the Izaña Atmospheric Research Centre from the Agencia Estatal de Meteorología, Tenerife, Spain, during the period 12 to 24 September 2016. This solar spectrum (QASUMEFTS) was combined from medium-resolution (bandpass of 0.86 nm) measurements of the QASUME (Quality Assurance of Spectral Ultraviolet Measurements in Europe) spectroradiometer in the wavelength range from 300 to 500 nm and high-resolution measurements (0.025 nm) from a Fourier transform spectroradiometer (FTS) over the wavelength range from 305 to 380 nm. The Kitt Peak solar flux atlas was used to extend this high-resolution solar spectrum to 500 nm. The expanded uncertainties of this solar spectrum are 2 % between 310 and 500 nm and 4 % at 300 nm. The comparison of this solar spectrum with solar spectra measured in space (top of the atmosphere) gave very good agreements in some cases, while in some other cases discrepancies of up to 5 % were observed. The QASUMEFTS solar spectrum represents a benchmark dataset with uncertainties lower than anything previously published. The metrological traceability of the measurements to the International System of Units (SI) is assured by an unbroken chain of calibrations leading to the primary spectral irradiance standard of the Physikalisch-Technische Bundesanstalt in Germany.

  8. Process spectroscopy in microemulsions—setup and multi-spectral approach for reaction monitoring of a homogeneous hydroformylation process

    NASA Astrophysics Data System (ADS)

    Meyer, K.; Ruiken, J.-P.; Illner, M.; Paul, A.; Müller, D.; Esche, E.; Wozny, G.; Maiwald, M.

    2017-03-01

    Reaction monitoring in disperse systems, such as emulsions, is of significant technical importance in various disciplines like biotechnological engineering, chemical industry, food science, and a growing number other technical fields. These systems pose several challenges when it comes to process analytics, such as heterogeneity of mixtures, changes in optical behavior, and low optical activity. Concerning this, online nuclear magnetic resonance (NMR) spectroscopy is a powerful technique for process monitoring in complex reaction mixtures due to its unique direct comparison abilities, while at the same time being non-invasive and independent of optical properties of the sample. In this study the applicability of online-spectroscopic methods on the homogeneously catalyzed hydroformylation system of 1-dodecene to tridecanal is investigated, which is operated in a mini-plant scale at Technische Universität Berlin. The design of a laboratory setup for process-like calibration experiments is presented, including a 500 MHz online NMR spectrometer, a benchtop NMR device with 43 MHz proton frequency as well as two Raman probes and a flow cell assembly for an ultraviolet and visible light (UV/VIS) spectrometer. Results of high-resolution online NMR spectroscopy are shown and technical as well as process-specific problems observed during the measurements are discussed.

  9. > Einleitung

    NASA Astrophysics Data System (ADS)

    Spath, Dieter; Pischetsrieder, Bernd

    Rund 40 Prozent aller Fahrzeuge fahren elektrisch. Ein Zustand, der aus heutiger Sicht noch in weiter Ferne liegt, war vor über 100 Jahren bereits Realität. Um 1900, einige Jahre nach der Erfindung des Automobils, wurden Fahrzeuge durch unterschiedliche Antriebskonzepte angetrieben. Die drei wichtigsten waren Dampfantrieb, Elektroantrieb und der Benzinmotor. Durch die überlegene Energiedichte und eine kostengünstige sowie scheinbar unendliche Verfügbarkeit des Energieträgers Öl entwickelte sich der Verbrennungsmotor zum dominanten Antriebskonzept. Der Einsatz von Elektrofahrzeugen beschränkte sich im Verlauf des 20. Jahrhunderts auf wenige Nischenanwendungen. Der verbrennungsmotorbasierte Antriebsstrang ist dem Elektroantrieb auch heute noch technisch und ökonomisch überlegen. Die Randbedingungen ändern sich jedoch. Die Verknappung des fossilen Brennstoffs Öl und die stetige Verschärfung der CO2-Emissionsziele in Verbindung mit einer starken Zunahme individueller Mobilität im asiatischen Raum und vielen weiteren Regionen der Welt stellen den Verbrennungsmotors als die dominante Antriebstechnologie in Frage. Trotz des Optimierungspotentials, welches auch nach über 120-jähriger Entwicklung noch im Verbrennungsmotor liegt, ist diese Technologie immer mit lokalen Schadstoff- und Lärmemissionen verbunden. Die Notwendigkeit der Reduktion von Treibhausgasen verbunden mit einem steigenden Urbanisierungsgrad wird in Zukunft einen Technologiewechsel vom Verbrennungsmotor zum elektrischen Antrieb attraktiv machen. Dieser Technologiewechsel bedeutet jedoch weit mehr als das Austauschen des Antriebsstranges, Elektromobilität ist ein komplexes Themengebiet mit unterschiedlichen Dimensionen.

  10. SI-traceable determination of the spring constant of a soft cantilever using the nanonewton force facility based on electrostatic methods

    NASA Astrophysics Data System (ADS)

    Nesterov, V.; Belai, O.; Nies, D.; Buetefisch, S.; Mueller, M.; Ahbe, T.; Naparty, D.; Popadic, R.; Wolff, H.

    2016-08-01

    The PTB’s (Physikalisch-Technische Bundesanstalt, Germany) nanonewton force facility, first presented in work by Nesterov (2007 Meas. Sci. Technol. 18 360-6), Nesterov (2009 Meas. Sci. Technol. 20 084012) and Nesterov et al (2009 Metrologia 46 277-82), has been significantly improved and used to measure the stiffness of a cantilever. The facility is based on a disc pendulum with electrostatic reduction of its deflection and stiffness. In this paper, we will demonstrate that the facility is able to measure horizontal forces in the range below 1 μN with a resolution below 5 pN and an uncertainty below 2.7% for a measured force of 1 nN at a measurement duration of about 20 s. We will demonstrate the possibility of using this facility as a calibration device that can accurately determine spring constants of soft cantilevers (K ≲ 0.1 N m-1) with traceability to the SI units. The method and the results of measuring the spring constant of a soft cantilever (K  =  0.125 N m-1) in air, in a medium vacuum, in a high vacuum and in nitrogen are presented. We will show that a relative standard uncertainty of the spring constant calibration of better than 0.3% (measurement in a medium vacuum) and a repeatability of better than 0.04% are achieved.

  11. Neutron scattering and models: Iron. Nuclear data and measurements series

    SciTech Connect

    Smith, A.B.

    1995-08-01

    Differential elastic and inelastic neutron-scattering cross sections of elemental iron are measured from 4.5 to 10 MeV in increments of {approx} 0.5 MeV. At each incident energy the measurements are made at forty or more scattering angles distributed between {approx} 17{degrees} and 160{degrees}, with emphasis on elastic scattering and inelastic scattering due to the excitation of the yrast 2{sup +} state. The measured data is combined with earlier lower-energy results from this laboratory, with recent high-precision {approx} 9.5 {yields} 15 MeV results from the Physilalisch Technische Bundesanstalt and with selected values from the literature to provide a detailed neutron-scattering data base extending from {approx} 1.5 to 26 MeV. This data is interpreted in the context of phenomenological spherical-optical and coupled-channels (vibrational and rotational) models, and physical implications discussed. Deformation, coupling, asymmetry and dispersive effects are explored. It is shown that, particularly in a collective context, a good description of the interaction of neutrons with iron is achieved over the energy range {approx} 0 {yields} 26 MeV, avoiding the dichotomy between high and low-energy interpretations found in previous work.

  12. Modification of a compressor performance test bench for liquid slugging observation in refrigeration compressors

    NASA Astrophysics Data System (ADS)

    Ola, Max; Thomas, Christiane; Hesse, Ullrich

    2017-08-01

    Compressor performance test procedures are defined by the standard DIN EN 13771, wherein a variety of possible calorimeter and flow rate measurement methods are suggested. One option is the selection of two independent measurement methods. The accuracies of both selected measurement methods are essential. The second option requires only one method. However the measurement accuracy of the used device has to be verified and recalibrated on a regular basis. The compressor performance test facility at the Technische Universitaet Dresden uses a calibrated flow measurement sensor, a hot gas bypass and a mixed flow heat exchanger. The test bench can easily be modified for tests of various compressor types at different operating ranges and with various refrigerants. In addition, the modified test setup enables the investigation of long term liquid slug and its effects on the compressor. The modification comprises observational components, adjustments of the control system, safety measures and a customized oil recirculation system for compressors which do not contain an integrated oil sump or oil level regulation system. This paper describes the setup of the test bench, its functional principle, the key modifications, first test results and an evaluation of the energy balance.

  13. Polarization dependence of multilayer reflectance in the EUV spectral range

    NASA Astrophysics Data System (ADS)

    Scholze, Frank; Laubis, Christian; Buchholz, Christian; Fischer, Andreas; Kampe, Annett; Plöger, Sven; Scholz, Frank; Ulm, Gerhard

    2007-03-01

    The Physikalisch-Technische Bundesanstalt (PTB) with its laboratory at the electron storage ring BESSY II supports the national and European industry by carrying out high-accuracy at-wavelength measurements in the EUV spectral region, particularly to support the development of EUV lithography, which holds the key to the next generation of computer technology. PTB operates an EUV reflectometry facility, designed for at-wavelength metrology of full-size EUVL optics with a maximum weight of 50 kg and a diameter of up to 550 mm and a micro-reflectometry station for reflectometry with sub 10 μm spatial resolution. An absolute uncertainty of 0.10 % is achieved for peak reflectance, with a reproducibility of 0.05 %. For the center wavelength an uncertainty of 2 pm is achieved with a long-term reproducibility of 1.1 pm and a short-term repeatability below 0.06 pm. Measurements at PTB use linearly polarized radiation, whereas EUV optics are operated with unpolarized sources and the status of polarization changes throughout the optical system. Therefore, to transfer these high-accuracy measurements to the EUV optical components under working conditions, it is essential to study the polarization dependence in detail. The degree of linear polarization in the EUV reflectometer is 97%. Representative polarization dependencies obtained on Mo/Si multilayer coatings over a wide range of angles of incidence reveal that the accuracy of calculations with the IMD-code is presently limited by the optical data available.

  14. REVIEW ARTICLE: From single photons to milliwatt radiant power—electron storage rings as radiation sources with a high dynamic range

    NASA Astrophysics Data System (ADS)

    Klein, Roman; Thornagel, Reiner; Ulm, Gerhard

    2010-10-01

    The spectral radiant intensity of synchrotron radiation from electron storage rings can be calculated from basic electrodynamic relations (Schwinger equation) and it is directly proportional to the stored electron beam current, i.e. the number of stored electrons. With the necessary equipment installed to measure and control the electron beam current over a wide dynamic range, the radiant intensity of the synchrotron radiation can be adjusted accordingly without changing the spectrum. This is done, e.g., at the Metrology Light Source (MLS), the dedicated electron storage ring of the Physikalisch-Technische Bundesanstalt. The MLS is operated as a primary radiation source standard from the near IR up to the soft x-ray region and its operational parameters can be adjusted and accurately measured in a wide range: the electron beam current can be varied from 1 pA (one stored electron) up to 200 mA and thus the radiant intensity can be changed by more than 11 decades. The photon flux or radiant power for typical angular acceptances can thus be varied from single photons to milliwatts. This is a very powerful tool, e.g., for the characterization of the linearity of the response of radiation detectors or for the calibration of photon counting detectors. In this article we present an overview of past, current and possible future activities exploiting this feature.

  15. Imaging the propagation of shock waves with both high temporal and high spatial resolution using XFELs

    NASA Astrophysics Data System (ADS)

    Schropp, Andreas

    2013-06-01

    The emergence of x-ray sources of the fourth generation, so called x-ray free-electron lasers (XFELs), comes along with completely new research opportunities in various scientific fields. During the last year we developed an x-ray microscope based on beryllium compound refractive lenses (Be-CRLs), which is especially optimized for the XFEL environment and provides focusing capabilities down to 100nm and even below. Based on magnified x-ray phase contrast imaging, this new setup enables us to pursue high-resolution x-ray imaging experiments with single XFEL-pulses. In a first experiment, carried out at the Matter in Extreme Conditions (MEC) endstation of the LCLS, the performance of the instrument was investigated by direct imaging of shock waves in different materials. The shock wave was induced by an intense 150 ps optical laser pulse. The evolution of the shock wave was then monitored with the XFEL-beam. In this contribution we report on first analysis results of phase contrast imaging of shock waves in matter. In collaboration with Brice Arnold, Eric Galtier, Hae Ja Lee, Bob Nagler, Jerome Hastings, SLAC National Accelerator Laboratory, 2575 Sand Hill Rd., Menlo Park, CA 94025, USA; Damian Hicks, Yuan Ping, Gilbert Collins, Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA 94551, USA; and Robert Hoppe, Vivienne Meier, Jens Patommel, Frank Seiboth, Christian Schroer, Institute of Structural Physics, Technische Universität Dresden, D-01062 Dresden, Germany.

  16. Experimental determination of the oxygen K-shell fluorescence yield using thin SiO2 and Al2O3 foils

    NASA Astrophysics Data System (ADS)

    Hönicke, P.; Kolbe, M.; Krumrey, M.; Unterumsberger, R.; Beckhoff, B.

    2016-10-01

    In this work, the K-shell fluorescence yield for oxygen ωO,K-shell is determined experimentally, employing the radiometrically calibrated X-ray fluorescence instrumentation of the Physikalisch-Technische Bundesanstalt (PTB), Germany's National Metrology Institute. Four free-standing thin foils with two different thicknesses of both SiO2 and Al2O3 were used in order to derive an experimental value for this atomic fundamental parameter. Multiple excitation photon energies were applied to record fluorescence spectra of all four samples. The resulting value (ωO,K-shell = 0.00688 ± 0.00036) is almost 20 % higher than the commonly used value from the Krause tables [M. Krause, Atomic Radiative and Radiationless Yields for K and L shells, J. Phys. Chem. Ref. Data 8(2), 307-327 (1979)]. In addition, the achieved total uncertainty budget for the new experimental value is reduced significantly in comparison to available literature data. For validation purposes, thin SiO2 layers on Si samples were used. Here, the layer thicknesses derived from X-ray reflectometry are well in line with our X-ray fluorescence quantification results based on the new experimental value for the O K-shell fluorescence yield.

  17. Numerical modelling of non-equilibrium graded sediment transport in a curved open channel

    NASA Astrophysics Data System (ADS)

    Bui, Minh Duc; Rutschmann, Peter

    2010-06-01

    The computer code FAST3D has been developed to calculate flow and sediment transport in open channels. In the code, the flow field is calculated by solving the full Reynolds-averaged Navier-Stokes equations with k-ɛ turbulence model; the bed-load transport is simulated with a non-equilibrium model containing an important parameter, the so-called non-equilibrium adaptation length, which characterizes the distance for sediment to adjust from a non-equilibrium state to an equilibrium state; the bed deformation is obtained from an overall mass-balance equation for sediment transport. The governing equations are solved numerically with a finite volume method on an adaptive, non-staggered grid. The former model assumed uniform bed material. In order to take into account the influence of grain-size distribution of the bed-surface on the evolution of the bed topography and consequently also on the flow field, a sediment transport module has been presently developed by the authors at the Institute of Hydraulic and Water Resources Engineering, Technische Universität München, Germany, for fractional sediment transport using a multiple layer model. This paper presents the numerical results for sediment sorting and the bed deformation in a curved alluvial channel under unsteady-flow conditions according to Yen and Lee (1995). The calculations were compared with data from laboratory measurements. Further, the sensitivity of the simulated results to the non-equilibrium adaptation length is investigated.

  18. Numerical investigation of three-dimensional cloud cavitation with special emphasis on collapse induced shock dynamics

    NASA Astrophysics Data System (ADS)

    Schnerr, Günter H.; Sezal, Ismail H.; Schmidt, Steffen J.

    2008-04-01

    The aim of the present investigation is to model and analyze compressible three-dimensional (3D) cavitating liquid flows with special emphasis on the detection of shock formation and propagation. We recently developed the conservative finite volume method CATUM (Cavitation Technische Universität München), which enables us to simulate unsteady 3D liquid flows with phase transition at all Mach numbers. The compressible formulation of the governing equations together with the thermodynamic closure relations are solved by a modified Riemann approach by using time steps down to nanoseconds. This high temporal resolution is necessary to resolve the wave dynamics that leads to acoustic cavitation as well as to detect regions of instantaneous high pressure loads. The proposed two-phase model based on the integral average properties of thermodynamic quantities is first validated against the solution of the Rayleigh-Plesset equation for the collapse of a single bubble. The computational fluid dynamics tool CATUM is then applied to the numerical simulation of the highly unsteady two-phase flow around a 3D twisted hydrofoil. This specific hydrofoil allows a detailed study of sheet and cloud cavitation structures related to 3D shock dynamics emerging from collapsing vapor regions. The time dependent development of vapor clouds, their shedding mechanism, and the resulting unsteady variation of lift and drag are discussed in detail. We identify instantaneous local pressure peaks of the order of 100bar, which are thought to be responsible for the erosive damage of the surface of the hydrofoil.

  19. First set of gated x-ray imaging diagnostics for the Laser Megajoule facility.

    PubMed

    Rosch, R; Trosseille, C; Caillaud, T; Allouche, V; Bourgade, J L; Briat, M; Brunel, P; Burillo, M; Casner, A; Depierreux, S; Gontier, D; Jadaud, J P; Le Breton, J P; Llavador, P; Loupias, B; Miquel, J L; Oudot, G; Perez, S; Raimbourg, J; Rousseau, A; Rousseaux, C; Rubbelynck, C; Stemmler, P; Troussel, P; Ulmer, J L; Wrobel, R; Beauvais, P; Pallet, M; Prevot, V

    2016-03-01

    The Laser Megajoule (LMJ) facility located at CEA/CESTA started to operate in the early 2014 with two quadruplets (20 kJ at 351 nm) focused on target for the first experimental campaign. We present here the first set of gated x-ray imaging (GXI) diagnostics implemented on LMJ since mid-2014. This set consists of two imaging diagnostics with spatial, temporal, and broadband spectral resolution. These diagnostics will give basic measurements, during the entire life of the facility, such as position, structure, and balance of beams, but they will also be used to characterize gas filled target implosion symmetry and timing, to study x-ray radiography and hydrodynamic instabilities. The design requires a vulnerability approach, because components will operate in a harsh environment induced by neutron fluxes, gamma rays, debris, and shrapnel. Grazing incidence x-ray microscopes are fielded as far as possible away from the target to minimize potential damage and signal noise due to these sources. These imaging diagnostics incorporate microscopes with large source-to-optic distance and large size gated microchannel plate detectors. Microscopes include optics with grazing incidence mirrors, pinholes, and refractive lenses. Spatial, temporal, and spectral performances have been measured on x-ray tubes and UV lasers at CEA-DIF and at Physikalisch-Technische Bundesanstalt BESSY II synchrotron prior to be set on LMJ. GXI-1 and GXI-2 designs, metrology, and first experiments on LMJ are presented here.

  20. The Metrology Light Source - the New Dedicated Electron Storage Ring of PTB

    SciTech Connect

    Ulm, G.; Brandt, G.; Eden, J.; Fliegauf, R.; Gottwald, A.; Hoehl, A.; Klein, R.; Mueller, R.; Richter, M.; Scholze, F.; Thornagel, R.; Anders, W.; Budz, P.; Buerkmann-Gehrlein, K.; Dressler, O.; Duerr, V.; Feikes, J.; Hoberg, H.-G.; Kuske, P.; Kraemer, D.

    2007-01-19

    The Physikalisch-Technische Bundesanstalt (PTB) is currently constructing a low-energy electron storage ring in the close vicinity of BESSY II where PTB operates a laboratory for synchrotron-radiation-based metrology, mainly in the X-ray spectral region. The new storage ring, which will be called 'Metrology Light Source' (MLS), will mainly be dedicated to metrology and technological development in the UV, EUV and VUV spectral range and will thus fill the gap in the spectral range that has opened up since the shut-down of BESSY I. Moreover, the MLS will deliver intense radiation in the IR and FIR/THz spectral range. The MLS can be operated with parameters optimized for special calibration tasks, which, at a multi-user facility such as BESSY II is rarely possible. The electron energy can be tuned in the range from 200 MeV up to 600 MeV and the electron beam current can be adjusted from 1pA (single electron) up to 200 mA. All relevant storage ring parameters can be measured with high accuracy, thus making the MLS a source of calculable synchrotron radiation, i.e. a primary source standard. The MLS is designed in close co-operation with the BESSY GmbH, construction has started in the autumn of 2004 and user operation is scheduled to begin in 2008.

  1. Status of the Metrology Light Source

    SciTech Connect

    Klein, R.; Ulm, G.; Feikes, J.; Hartrott, M. von; Wuestefeld, G.

    2010-06-23

    The Physikalisch-Technische Bundesanstalt (PTB), the German national metrology institute, has set up the low-energy electron storage ring Metrology Light Source (MLS) in close cooperation with the Helmholtz-Zentrum Berlin (HZB, formerly BESSY). This new storage ring has been in regular user operation since April 2008 and is dedicated to synchrotron-radiation-based metrology and technological developments in the far-IR/THz, IR, UV, VUV and EUV spectral range. The MLS has a double-bend-achromate lattice structure, injection is from a 105 MeV racetrack microtron. The electron energy can be ramped to any value from 105 MeV up to 630 MeV and the electron beam current covers the range from one stored electron (1 pA) up to 200 mA. The MLS is the first electron storage ring optimized for the generation of coherent synchrotron radiation, based on an electron bunch shortening mode. In this mode, MLS delivers coherent radiation in the far-IR/THz spectral range with enhanced intensity as compared to the normal mode of operation. Several beamlines are in operation or in construction, including one undulator beamline, bending magnet beamlines for the calibration of radiation sources and detectors and for reflectometry, an EUV metrology beamline and three IR/THz beamlines.

  2. Chemical management and control strategies: experiences from the GTZ pilot project on chemical safety in Indonesian small and medium-sized enterprises.

    PubMed

    Tischer, M; Scholaen, S

    2003-10-01

    In 1998 the Deutsche Gesellschaft für Technische Zusammenarbeit (GTZ) launched the Convention Project on Chemical Safety in developing countries. The project aims to support developing countries in the implementation of the Rotterdam and Stockholm Conventions, create human resources and institutional capacities and to demonstrate via pilot measures how chemical safety in the partner countries can be improved and sustainably implemented in line with international standards. With this objective the development of a Chemical Management Guide (CM Guide) for small and medium-sized enterprises in developing countries has been initiated. The guide describes a step-by-step approach which is based on identifying 'hot-spots' as a first step, and making a chemical inventory as a second step. The third step is the continuous improvement of chemical management. In total, there are six tools that aim to support the chemical management process: basic concepts for risk assessment; description of control approaches; using material safety data sheets (MSDSs); risk phrases for hazardous substances; safety phrases for hazardous substances; symbols used for labelling hazardous substances. In the course of the test-implementation of the CM Guide in Indonesia, it was found that MSDSs were not available in most of the smaller companies. In contrast, medium-sized and larger companies do have more MSDSs available. It was also found that the way to engage the minds of company owners and managers is with economic arguments related to the loss, waste and expiry of materials, and quality standards expected from importing countries.

  3. Modelling PTB's spatial angle autocollimator calibrator

    NASA Astrophysics Data System (ADS)

    Kranz, Oliver; Geckeler, Ralf D.; Just, Andreas; Krause, Michael

    2013-05-01

    The accurate and traceable form measurement of optical surfaces has been greatly advanced by a new generation of surface profilometers which are based on the reflection of light at the surface and the measurement of the reflection angle. For this application, high-resolution electronic autocollimators provide accurate and traceable angle metrology. In recent years, great progress has been made at the Physikalisch-Technische Bundesanstalt (PTB) in autocollimator calibration. For an advanced autocollimator characterisation, a novel calibration device has been built up at PTB: the Spatial Angle Autocollimator Calibrator (SAAC). The system makes use of an innovative Cartesian arrangement of three autocollimators (two reference autocollimators and the autocollimator to be calibrated), which allows a precise measurement of the angular orientation of a reflector cube. Each reference autocollimator is sensitive primarily to changes in one of the two relevant tilt angles, whereas the autocollimator to be calibrated is sensitive to both. The distance between the reflector cube and the autocollimator to be calibrated can be varied flexibly. In this contribution, we present the SAAC and aspects of the mathematical modelling of the system for deriving analytical expressions for the autocollimators' angle responses. These efforts will allow advancing the form measurement substantially with autocollimator-based profilometers and approaching fundamental measurement limits. Additionally, they will help manufacturers of autocollimators to improve their instruments and will provide improved angle measurement methods for precision engineering.

  4. High-accuracy detector calibration in the 3-1500 eV spectral range at the PTB radiometry laboratory.

    PubMed

    Scholze, F; Henneken, H; Kuschnerus, P; Rabus, H; Richter, M; Ulm, G

    1998-05-01

    State-of-the-art detector calibration in the UV/VUV and soft X-ray spectral ranges at the Physikalisch-Technische Bundesanstalt (PTB) is based on the primary detector standard SYRES, a cryogenic electrical substitution radiometer capable of measuring radiant power of a few micro W. At the PTB radiometry laboratory at the synchrotron radiation facility BESSY, two dedicated beamlines are operated, providing monochromatic radiation of high spectral purity, high radiant power and tunable photon energy in the 3-1500 eV range. The spectral responsivity of detectors, e.g. photodiodes, can be measured with a relative uncertainty of about 1% by direct comparison with SYRES, as will be demonstrated for PtSi/Si and GaAsP/Au Schottky and silicon n-on-p photodiodes. The calibration of photon-counting detectors traceable to SYRES can by accomplished by exploiting the unique capability to scale the spectral photon flux over several orders of magnitude by changing the stored electron current. Calibrations of CCDs and photomultipliers are presented as examples.

  5. Patrick Couvreur: inspiring pharmaceutical innovation.

    PubMed

    Stanwix, Hannah

    2014-05-01

    Patrick Couvreur speaks to Hannah Stanwix, Managing Comissioning Editor: Professor Patrick Couvreur received his pharmacy degree from the Université Catholique de Louvain (Louvain-la-Neuve, Belgium) in 1972. He holds a PhD in pharmaceutical technology from the same university and completed a postdoctoral fellowship at the Eidgenössische Technische Hochschule (Zürich, Switzerland). Since 1984, Professor Couvreur has been Full Professor of Pharmacy at the Paris-Sud University (Paris, France) and was holder of the Chair of Innovation Technologique at the prestigious Collège de France (Paris, France). He has published more than 450 peer-reviewed articles and has an H-index of 73, with over 19,000 citations. Professor Coureur has been recognized by numerous national and international awards, including the 2004 Pharmaceutical Sciences World Congress Award, the prestigious Host Madsen Medal, the Prix Galien, the European Pharmaceutical Scientist Award 2011 from the European Federation of Pharmaceutical Sciences, the Médaille de l'Innovation from the Centre National de la Recherche Scientifique, and recently the European Inventor Award 2013 from the European Patent Office.

  6. Recent work of decay spectroscopy at RIBF

    NASA Astrophysics Data System (ADS)

    Söderström, Pär-Anders

    2014-09-01

    β- and isomer-decay spectroscopy are sensitive probes of nuclear structure, and are often the only techniques capable of providing data for exotic nuclei that are producted with very low rates. Decay properties of exotic nuclei are also essential to model astrophysical events responible for the evolution of the universe such as the rp- and r-process. The EURICA project (EUROBALL RIKEN Cluster Array) has been launched in 2012 with the goal of performing spectroscopy of very exotic nuclei. Since 2012, four experimental campaigns have been successfully completed using fragmentation of 124Xe beam and in-flight-fission of 238U beam, approaching for example the key nuclei 78Ni, 110Zr, 100Sn, 128Pd, and 138Sn. This contribution highlights the experiments performed, results obtained, and discusses the future perspective of the EURICA project. In collaboration with Shunji Nishimura, Hidetada Baba, RIKEN Nishina Center; Frank Browne, Brighton University; Pieter Doornenbal, RIKEN Nishina Center; Guillaume Gey, Universite Joseph Fourier Grenoble; Tadaaki Isobe and Giuseppe Lorusso, RIKEN Nishina Center; Daniel Lubos, Technische Universitat Munchen; Kevin Mochner, University of Cologne; Zena Patel and Simon Rice, University of Surrey; Hiroyoshi Sakurai, RIKEN Nishina Center; Laura Sinclair, University of York; Toshiyuki Sumikama, Tohoku University; Jan Taprogge, Universidad Autonoma de Madrid; Zsolt Vajta, MTA Atomki; Hiroshi Watanabe, Beihang University; Jin Wu, Peking University; and Zhengyu Xu, University of Tokyo.

  7. KEY COMPARISON: Activity measurements of the radionuclide 201Tl for the LNE-LNHB, France, PTB, Germany and the NPL, UK in the ongoing comparison BIPM.RI(II)-K1.Tl-201

    NASA Astrophysics Data System (ADS)

    Ratel, G.; Michotte, C.; Moune, M.; Bobin, C.; Kossert, K.; Johansson, L.

    2008-01-01

    In 2005, the Laboratoire national de métrologie et essais-Laboratoire national Henri Becquerel (LNE-LNHB) and the Physikalisch-Technische Bundesanstalt (PTB) each submitted a sample of known activity of 201Tl to the International Reference System (SIR). In 2006, the National Physical Laboratory (NPL) submitted their first sample. The range of values of the activity submitted was between 2 MBq and 63 MBq. These key comparison results have been included in the re-evaluated key comparison reference value and replaced the previous results for France and Germany in the matrix of degrees of equivalence in the key comparison database that now contains seven results, identifier BIPM.RI(II)-K1.Tl-201. Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCRI Section II, according to the provisions of the CIPM Mutual Recognition Arrangement (MRA).

  8. Shannon's Energy Based Algorithm in ECG Signal Processing

    PubMed Central

    2017-01-01

    Physikalisch-Technische Bundesanstalt (PTB) database is electrocardiograms (ECGs) set from healthy volunteers and patients with different heart diseases. PTB is provided for research and teaching purposes by National Metrology Institute of Germany. The analysis method of complex QRS in ECG signals for diagnosis of heart disease is extremely important. In this article, a method on Shannon energy (SE) in order to detect QRS complex in 12 leads of ECG signal is provided. At first, this algorithm computes the Shannon energy (SE) and then makes an envelope of Shannon energy (SE) by using the defined threshold. Then, the signal peaks are determined. The efficiency of the algorithm is tested on 70 cases. Of all 12 standard leads, ECG signals include 840 leads of the PTB Diagnostic ECG Database (PTBDB). The algorithm shows that the Shannon energy (SE) sensitivity is equal to 99.924%, the detection error rate (DER) is equal to 0.155%, Positive Predictivity (+P) is equal to 99.922%, and Classification Accuracy (Acc) is equal to 99.846%. PMID:28197213

  9. Magnetisch abgeschirmte Kabine zur Aufnahme kleinster magnetischer und elektrischer Biosignale

    NASA Astrophysics Data System (ADS)

    Mager, Albrecht

    1982-08-01

    An extraordinary magnetically shielded room was designed and constructed for the Physikalisch-Technische Bundesanstalt Institut Berlin to measure extremely weak magnetic fields of the human body with SQUID-magnetometers. The inner and the outer dimensions of the cube-shaped room are 2.25 m and about 5 m. The shield has 6 magnetic shells of a high-permeability alloy and an inner shell welded of massive copper plates. The total weight of the magnetic alloy is about 10 t and about 5 t for the inner copper shell. The required shielding factor of 1000 for the very low frequencies was greatly surpassed by the real measured value of 10000 (measured without any compensating or idealizing method). With rising frequencies the shielding factor reaches higher values, at 50 Hz more than 100000 and a million for 1000 Hz. First measurements in the shielded room with high-resolution magnetocardiograms (HR MCG) and high-resolution electrocardiograms (HR ECG) showed new methods for non-invasive electrophysiological investigations in man.

  10. [Magnetic shielded room to measure very low magnetic and electric fields].

    PubMed

    Mager, A

    1982-08-01

    An extraordinary magnetically shielded room was designed and constructed for the Physikalisch-Technische Bundesanstalt Institut Berlin to measure extremely weak magnetic fields of the human body with SQUID-magnetometers. The inner and the outer dimensions of the cube-shaped room are 2.25 m and about 5 m. The shield has 6 magnetic shells of a high-permeability alloy and an inner shell welded of massive copper plates. The total weight of the magnetic alloy is about 10 t and about 5 t for the inner copper shell. The required shielding factor of 1000 for the very low frequencies was greatly surpassed by the real measured value of 10000 (measured without any compensating or idealizing method). With rising frequencies the shielding factor reaches higher values, at 50 Hz more than 100000 and a million for 1000 Hz. First measurements in the shielded room with high-resolution magnetocardiograms (HR MCG) and high-resolution electrocardiograms (HR ECG) showed new methods for non-invasive electrophysiological investigations in man.

  11. Bilateral key comparison CCM.P-K3.1 for absolute pressure measurements from 3 × 10-6 Pa to 9 × 10-4 Pa

    NASA Astrophysics Data System (ADS)

    Fedchak, J. A.; Bock, Th; Jousten, K.

    2014-01-01

    This report describes the bilateral key comparison CCM.P-K3.1 between the National Institute of Standards and Technology (NIST) and Physikalisch-Technische Bundesanstalt (PTB) for absolute pressure in the range from 3 × 10-6 Pa to 9 × 10-4 Pa. This comparison was a follow-up to the comparison CCM.P-K3. Two ionization gauges and two spinning rotor gauges (SRGs) were used as the transfer standards for the comparison. The SRGs were used to compare the standards at a pressure of 9 × 10-4 Pa and to normalize the ionization gauge readings. The two ionization gauges were used to compare the standards in the pressure range of from 3 × 10-6 Pa to 3 × 10-4 Pa. Both laboratories used dynamic expansion chambers as standards in the comparison. The two labs showed excellent agreement with each other and with the CCM.P-K3 key comparison reference value (KCRV) over the entire range. Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

  12. Do Radioactive Half-Lives Depend on the Earth-Sun Distance?

    NASA Astrophysics Data System (ADS)

    Goodwin, John; Hardy, John; Iacob, Victor; Golovko, Victor

    2010-11-01

    In recent articles [1-4], Jenkins et al. claim to have evidence that radioactive half-lives vary as a function of the earth-to-sun distance. They base their claims on data obtained by others over the space of several years -- the decay of ^32Si as measured at Brookhaven National Laboratory [5] from 1982-85 and that of ^226Ra as measured at the Physikalisch Technische Bundesanstalt in Germany [6] from 1984-88 -- in which the decay rates show a small but statistically significant oscillation with a period of one year and approximately correlated with the earth-sun distance (and with the seasons). Here we report a series of seven measurements of the ^198Au half-life (see [7] for a description of two of these) made by us at various intervals over a period of one aphelion-aphelion cycle. Each measured half-life has a precision of about 0.02%. There is no evidence of any deviation from a constant half-life. [1] J. H. Jenkins et al., Astropart. Phys. 31 407 (2009) [2] J. H. Jenkins et al., Astropart. Phys. 32, 42 (2010) [3] E. Fischbach et al., Space Sci. Rev. 145, 285 (2009) [4] J. Jenkins et al., arxiv:0912:5385v1 [5] D. Alburger et al., Earth and Planet. Sci. Lett. 78, 168 (1986) [6] H. Siegert et al., Appl. Radiat. Isot. 49, 1397 (1998) [7] J. R. Goodwin et al., Eur. Phys. J. A 34, 271 (2007).

  13. Analysis of gamma radiation from a radon source: Indications of a solar influence

    NASA Astrophysics Data System (ADS)

    Sturrock, P. A.; Steinitz, G.; Fischbach, E.; Javorsek, D.; Jenkins, J. H.

    2012-08-01

    This article presents an analysis of about 29,000 measurements of gamma radiation associated with the decay of radon in a sealed container at the Geological Survey of Israel (GSI) Laboratory in Jerusalem between 28 January 2007 and 10 May 2010. These measurements exhibit strong variations in time of year and time of day, which may be due in part to environmental influences. However, time-series analysis reveals a number of periodicities, including two at approximately 11.2 year-1 and 12.5 year-1. We have previously found these oscillations in nuclear-decay data acquired at the Brookhaven National Laboratory and at the Physiklisch-Technische Bundesanstalt, and we have suggested that these oscillations are attributable to some form of solar radiation that has its origin in the deep solar interior. A curious property of the GSI data is that the annual oscillation is much stronger in daytime data than in nighttime data, but the opposite is true for all other oscillations. This may be a systematic effect but, if it is not, this property should help narrow the theoretical options for the mechanism responsible for decay-rate variability.

  14. Process spectroscopy in microemulsions—Raman spectroscopy for online monitoring of a homogeneous hydroformylation process

    NASA Astrophysics Data System (ADS)

    Paul, Andrea; Meyer, Klas; Ruiken, Jan-Paul; Illner, Markus; Müller, David-Nicolas; Esche, Erik; Wozny, Günther; Westad, Frank; Maiwald, Michael

    2017-03-01

    A major industrial reaction based on homogeneous catalysis is hydroformylation for the production of aldehydes from alkenes and syngas. Hydroformylation in microemulsions, which is currently under investigation at Technische Universität Berlin on a mini-plant scale, was identified as a cost efficient approach which also enhances product selectivity. Herein, we present the application of online Raman spectroscopy on the reaction of 1-dodecene to 1-tridecanal within a microemulsion. To achieve a good representation of the operation range in the mini-plant with regard to concentrations of the reactants a design of experiments was used. Based on initial Raman spectra partial least squares regression (PLSR) models were calibrated for the prediction of 1-dodecene and 1-tridecanal. Limits of predictions arise from nonlinear correlations between Raman intensity and mass fractions of compounds in the microemulsion system. Furthermore, the prediction power of PLSR models becomes limited due to unexpected by-product formation. Application of the lab-scale derived calibration spectra and PLSR models on online spectra from a mini-plant operation yielded promising estimations of 1-tridecanal and acceptable predictions of 1-dodecene mass fractions suggesting Raman spectroscopy as a suitable technique for process analytics in microemulsions.

  15. Validation of DTRF2014, ITRF2014 and JTRF2014 by precise orbit determination of SLR and altimetry satellites

    NASA Astrophysics Data System (ADS)

    Rudenko, Sergei; Bloßfeld, Mathis; Müller, Horst; Dettmering, Denise; Angermann, Detlef; Kehm, Alexander

    2017-04-01

    Recently, three new realizations of the International Terrestrial Reference System (ITRS) have been released. They are DTRF2014 developed by the International Earth Rotation and Reference Systems Service (IERS) ITRS Combination Centre at Deutsches Geodätisches Forschungsinstitut of the Technische Universität München, ITRF2014 elaborated at the IERS ITRS Product Center at the Laboratoire de Recherches en Géodésie of the Institut National de l'Information Géographique et Forestière (IGN LAREG, France) and JTRF2014 created at the Jet Propulsion Laboratory (JPL, USA). In this paper, we validate these three ITRS realisations by precise orbit determination of high-orbit geodetic satellites Lageos-1 and Lageos-2 and some low-orbit satellites like Jason-2 and some others using SLR observations. We investigate the impact on the residuals of observations, estimated range biases, empirical accelerations and other parameters. For altimetry satellites, we study the impact of each ITRS realization on radial and geographically correlated errors as well as on the global and regional mean sea level trends estimated using the satellite orbits computed using these ITRS realizations.

  16. Agitated saline bubble-enhanced transthoracic echocardiography: a novel method to visualize the position of central venous catheter.

    PubMed

    Wen, Ming; Stock, Konrad; Heemann, Uwe; Aussieker, Mario; Küchle, Claudius

    2014-03-01

    The purpose of this study is to describe a novel method to visualize the position of central venous catheters, which is safe, expeditious, and less expensive than the routine postprocedural chest radiograph. Retrospective comparative study. Dialysis Center of the Department of Nephrology, Klinikum rechts der Isar, Technische Universität München, Munich, Germany. Two hundred and two adult patients undergoing central venous catheter placement for dialysis, plasmapheresis, or administration of medication and solutions. None. Data of 202 adult patients with 219 central venous catheterizations were retrospectively analyzed. Each catheter insertion was followed by an agitated saline bubble-enhanced transthoracic echocardiography, which was used to localize the tip of the catheter. The position of catheter was then controlled by chest radiograph in all cases. During the 13-month study period, two catheter malpositions occurred. Both were identified by agitated saline bubble-enhanced transthoracic echocardiography and confirmed by chest radiograph. The mean time between catheter insertion and chest radiograph control (28.3 min) was clearly longer than agitated saline bubble-enhanced transthoracic echocardiography (3.2 min) (p < 0.001). The total costs of the procedure were reduced by 86.7-95.0%. Specific complications related to the procedure were not observed. The results revealed that the accuracy of agitated saline bubble-enhanced transthoracic echocardiography is equivalent to the chest radiograph. It offers a safe, cost-effective, expeditious alternative to routine chest radiograph for position controls of central venous catheters.

  17. Numerical and experimental results of the operational neutron dosemeter 'Saphydose-N'.

    PubMed

    Lahaye, T; Chau, Q; Ménard, S; Ndontchueng-Moyo, M; Bolognese-Milsztajn, T; Rannou, A

    2004-01-01

    Since 1993, the Institute for Radiological Protection and Nuclear Safety (IRSN) has lead, in association with Electricité de France (EDF), a R&D study of a neutron personal electronic dosemeter. This dosemeter, called 'Saphydose-N', is manufactured by the SAPHYMO company. This paper presents first the optimisation of some detector components using Monte Carlo calculations, and second the test of the manufactured Saphydose-N under radiation following the IEC 1323 standard's recommendations for active personal neutron dosemeters. The measurements with the manufactured dosemeter were performed on the one hand at PTB (Physikalisch-Technische Bundesanstalt) in mono-energetic neutron fields and, on the other hand at IRSN in neutron fields generated by a thermal facility (SIGMA), radionuclide ISO sources and a realistic spectrum (CANEL/T400). The manufactured dosemeter Saphydose-N was also tested during measurement campaigns of the European programme EVIDOS ('Evaluation of Individual Dosimetry in Mixed Neutron and Photon Radiation Fields') at different nuclear workplaces. The study showed that Saphydose-N complies with the recommendations of standard IEC 1323 and can be used at any workplace with no previous knowledge of the neutron field characteristics.

  18. Progress on glass ceramic ZERODUR enabling nanometer precision

    NASA Astrophysics Data System (ADS)

    Jedamzik, Ralf; Kunisch, Clemens; Nieder, Johannes; Weber, Peter; Westerhoff, Thomas

    2016-03-01

    The Semiconductor Industry is making continuous progress in shrinking feature size developing technologies and process to achieve < 10 nm feature size. The required Overlay specification for successful production is in the range one nanometer or even smaller. Consequently, materials designed into metrology systems of exposure or inspection tools need to fulfill ever tighter specification on the coefficient of thermal expansion (CTE). The glass ceramic ZERODUR® is a well-established material in critical components of microlithography wafer stepper and offered with an extremely low coefficient of thermal expansion, the tightest tolerance available on market. SCHOTT is continuously improving manufacturing processes and it's method to measure and characterize the CTE behavior of ZERODUR®. This paper is focusing on the "Advanced Dilatometer" for determination of the CTE developed at SCHOTT in the recent years and introduced into production in Q1 2015. The achievement for improving the absolute CTE measurement accuracy and the reproducibility are described in detail. Those achievements are compared to the CTE measurement accuracy reported by the Physikalische Technische Bundesanstalt (PTB), the National Metrology Institute of Germany. The CTE homogeneity is of highest importance to achieve nanometer precision on larger scales. Additionally, the paper presents data on the short scale CTE homogeneity and its improvement in the last two years. The data presented in this paper will explain the capability of ZERODUR® to enable the extreme precision required for future generation of lithography equipment and processes.

  19. Analysis of terrain data based on satellite imagery for aviation purposes

    NASA Astrophysics Data System (ADS)

    Eilmus, B.; Heidelmeyer, G.; Klingauf, U.

    2007-10-01

    Due to the regulation of the ICAO (International Civil Aviation Organization), which requires the provision of electronic terrain data with a certain quality by each contracting state for its territory, the demand for terrain data for aviation purposes increases. This regulation poses a problem particularly for developing and newly industrialising countries, which have not the financial resources for the generation of terrain data meeting the required specifications. Studies performed at the Institute of Flight Systems and Automatic Control at the Technische Universitaet Darmstadt show that a promising and cost-effective method to encounter this challenge is the use of high resolution optical satellite imagery with a stereoscopic coverage. This method can be performed without the acquisition of ground control points and leads by this to cost reductions. To validate this method, the accuracy of terrain data generated from satellite imagery is analysed. Due to the various available very high resolution satellites, the accuracy is not limited by the spatial resolution of the imagery, but principally by the accuracy of the geolocation. This is why furthermore methods are proposed that may help to increase the accuracy, to eliminate blunders as well as systematic errors and thus to enhance the reliability of the acquired terrain information in order to achieve applicability in aviation.

  20. First set of gated x-ray imaging diagnostics for the Laser Megajoule facility

    NASA Astrophysics Data System (ADS)

    Rosch, R.; Trosseille, C.; Caillaud, T.; Allouche, V.; Bourgade, J. L.; Briat, M.; Brunel, P.; Burillo, M.; Casner, A.; Depierreux, S.; Gontier, D.; Jadaud, J. P.; Le Breton, J. P.; Llavador, P.; Loupias, B.; Miquel, J. L.; Oudot, G.; Perez, S.; Raimbourg, J.; Rousseau, A.; Rousseaux, C.; Rubbelynck, C.; Stemmler, P.; Troussel, P.; Ulmer, J. L.; Wrobel, R.; Beauvais, P.; Pallet, M.; Prevot, V.

    2016-03-01

    The Laser Megajoule (LMJ) facility located at CEA/CESTA started to operate in the early 2014 with two quadruplets (20 kJ at 351 nm) focused on target for the first experimental campaign. We present here the first set of gated x-ray imaging (GXI) diagnostics implemented on LMJ since mid-2014. This set consists of two imaging diagnostics with spatial, temporal, and broadband spectral resolution. These diagnostics will give basic measurements, during the entire life of the facility, such as position, structure, and balance of beams, but they will also be used to characterize gas filled target implosion symmetry and timing, to study x-ray radiography and hydrodynamic instabilities. The design requires a vulnerability approach, because components will operate in a harsh environment induced by neutron fluxes, gamma rays, debris, and shrapnel. Grazing incidence x-ray microscopes are fielded as far as possible away from the target to minimize potential damage and signal noise due to these sources. These imaging diagnostics incorporate microscopes with large source-to-optic distance and large size gated microchannel plate detectors. Microscopes include optics with grazing incidence mirrors, pinholes, and refractive lenses. Spatial, temporal, and spectral performances have been measured on x-ray tubes and UV lasers at CEA-DIF and at Physikalisch-Technische Bundesanstalt BESSY II synchrotron prior to be set on LMJ. GXI-1 and GXI-2 designs, metrology, and first experiments on LMJ are presented here.

  1. The Rules of Ferrous Metallurgy

    PubMed Central

    2010-01-01

    The ways in which the sciences have been delineated and categorized throughout history provide insights into the formation, stabilization, and establishment of scientific systems of knowledge. The Dresdener school’s approach for explaining and categorizing the genesis of the engineering disciplines is still valid, but needs to be complemented by further-reaching methodological and theoretical reflections. Pierre Bourdieu’s theory of social practice is applied to the question of how individual agents succeed in influencing decisively a discipline’s changing object orientation, institutionalisation and self-reproduction. Through the accumulation of social, cultural and economic capital, they succeed in realising their own organisational ideas and scientific programs. Key concepts for the analysis include the struggle for power and resources, monopolies of interpretation, and the degree of autonomy. A case study from the Aachener Technische Hochschule shows that the consolidation of ferrous metallurgy can be conceived as a symbolical struggle between Fritz Wüst, professor for ferrous metallurgy, and the German Iron and Steel Institute, leading to a construction of a system of differences in which scientists accepted being scientists rather than entrepreneurs, and entrepreneurs accepted becoming entrepreneurs and renounced science.

  2. Frequency Comparison and Absolute Frequency Measurement of I2-stabilized Lasers at 532 nm

    NASA Astrophysics Data System (ADS)

    Nevsky, A. Yu.; Holzwarth, R.; Reichert, J.; Udem, Th.; Haensch, T. W.; von Zanthier, J.; Walther, H.; Schnatz, H.; Riehle, F.; Pokasov, P. V.; Skvortsov, M. N.; Bagayev, S. N.

    We present a frequency comparison and an absolute frequency measurement of two independent I2-stabilized frequency-doubled Nd:YAG lasers at 532 nm, one set up at the Institute of Laser Physics, Novosibirsk, Russia, the other at the Physikalisch-Technische Bundesanstalt, Braunschweig, Germany. The absolute frequency of the I2-stabilized lasers was determined using a CH4-stabilized He-Ne laser as a reference. This laser had been calibrated prior to the measurement by an atomic cesium fountain clock. The frequency chain linking phase-coherently the two frequencies made use of the frequency comb of a Kerr-lens mode-locked Ti:sapphire femtosecond laser where the comb mode separation was controlled by a local cesium atomic clock. A new value for the R(56)32-0:a10 component, recommended by the Comité International des Poids et Mesures (CIPM) for the realization of the metre [1], was obtained with reduced uncertainty. Absolute frequencies of the R(56)32-0 and P(54)32-0 iodine absorp tion lines together with the hyperfine line separations were measured.

  3. Frequency comparison and absolute frequency measurement of I 2-stabilized lasers at 532 nm

    NASA Astrophysics Data System (ADS)

    Nevsky, A. Yu.; Holzwarth, R.; Reichert, J.; Udem, Th.; Hänsch, T. W.; Zanthier, J. von; Walther, H.; Schnatz, H.; Riehle, F.; Pokasov, P. V.; Skvortsov, M. N.; Bagayev, S. N.

    2001-06-01

    A frequency comparison and an absolute frequency measurement of iodine stabilized frequency-doubled Nd:YAG lasers at 532 nm has been performed at the Max-Planck-Institute for Quantum Optics. Two independent I 2-stabilized laser systems, one assembled at the Institute of Laser Physics, Novosibirsk, Russia, the other at the Physikalisch-Technische Bundesanstalt, Braunschweig, Germany were investigated. Using a phase-coherent frequency chain, the absolute frequency of the I 2-stabilized lasers has been compared to a CH 4-stabilized He-Ne laser at 3.39 μm which has been calibrated against an atomic cesium fountain clock. A new value for the R(56)32-0:a 10 component, recommended by the Comit é International des Poids et Mesures for the realization of the meter [Metrologia 30 (1993/1994) 523; Metrologia 36 (1999) 211], has been obtained with reduced uncertainty. Improved absolute frequency values of the R(56)32-0 and P(54)32-0 iodine absorption lines together with the hyperfine line separations are presented.

  4. Frequency Comparison and Absolute Frequency Measurement of I2-stabilized Lasers at 532 nm

    NASA Astrophysics Data System (ADS)

    Nevsky, A. Y.; Holzwarth, R.; Reichert, J.; Udem, Th.; Hänsch, T. W.; von Zanthier, J.; Walther, H.; Schnatz, H.; Riehle, F.; Pokasov, P. V.; Skvortsov, M. N.; Bagayev, S. N.

    We present a frequency comparison and an absolute frequency measurement of two independent I2-stabilized frequency-doubled Nd:YAG lasers at 532 nm, one set up at the Institute of Laser Physics, Novosibirsk, Russia, the other at the Physikalisch-Technische Bundesanstalt, Braunschweig, Germany. The absolute frequency of the I2-stabilized lasers was determined using a CH4-stabilized He-Ne laser as a reference. This laser had been calibrated prior to the me asurement by an atomic cesium fountain clock. The frequency chain linking phase-coherently the two frequencies made use of the frequency comb of a Kerr-lens mode-locked Ti:sapphire femtosecond laser where the comb mode separation was controlled by a local cesium atomic clock. A new value for the R(56)32-0:a10 component, recommended by the Comitacute e International des Poids et Mesures (CIPM) for the realization of the metre [1], was obtained with reduced uncertainty. Absolute frequencies of the R(56)32-0 and P(54)32-0 iodine absorp tion lines together with the hyperfine line separations were measured.

  5. Characterization of a Large-Area Pyroelectric Detector from 300 GHz to 30 THz

    NASA Astrophysics Data System (ADS)

    Müller, Ralf; Gutschwager, Berndt; Hollandt, Jörg; Kehrt, Mathias; Monte, Christian; Müller, Ralph; Steiger, Andreas

    2015-07-01

    The national metrology institute of Germany, the Physikalisch-Technische Bundesanstalt (PTB), together with the company Sensor and Lasertechnik (SLT), develops pyroelectric detectors for radiation in the terahertz (THz) spectral range. The intention of this development is to deliver a highly sensitive, accurately calibrated detector for power measurement in the power range of time-domain spectroscopy (TDS) systems. This work reports about a large-area thin-film pyroelectric (TFP) detector applicable within a wide spectral range from 300 GHz to 30 THz and its radiometric characterization by PTB's THz radiation sources. Applying coherent synchrotron radiation from the Metrology Light Source (MLS), laser radiation from a molecular gas laser and blackbody radiation from a water-heated blackbody to this detector reveal its potential to be capable of spanning an even wider THz frequency range than covered by TDS systems. To demonstrate this, its spectral responsivity was measured at different frequencies between 300 GHz and 30 THz by means of those three THz radiation sources.

  6. Key comparison BIPM.RI(I)-K4 of the absorbed dose to water standards of the PTB, Germany and the BIPM in 60Co gamma radiation

    NASA Astrophysics Data System (ADS)

    Kessler, C.; Burns, D. T.; Kapsch, R.-P.; Krauss, A.

    2016-01-01

    An indirect comparison has been made of the standards for absorbed dose to water in 60Co radiation of the Physikalisch-Technische Bundesanstalt, (PTB), Germany and of the Bureau International des Poids et Mesures (BIPM). The measurements at the BIPM were carried out in October 2015. The comparison result, based on the calibration coefficients for two transfer standards and evaluated as a ratio of the PTB and the BIPM standards for absorbed dose to water, is 0.9977 with a combined standard uncertainty of 3.8 × 10-3. The results are analysed and presented in terms of degrees of equivalence for entry in the BIPM key comparison database. Main text To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCRI, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

  7. Learning tumor diagnostics and medical image processing via the WWW--the case-based radiological textbook ODITEB.

    PubMed

    Horsch, A; Balbach, T; Melnitzki, S; Knauth, J

    2000-09-01

    New Internet technologies offer excellent chances to build high-quality on-line learning media for the education in medicine. Especially, the teaching of diagnostics with medical imaging as well as medical image processing can be supported by the excellent visualization and interaction capabilities. In cooperation with three radiological departments at German universities in Munich, Erlangen and Würzburg, the case-based open distributed Internet text book (ODITEB) for tumor diagnosis of the GI-tract, liver, pancreas and thorax has been developed at the Institut für Medizinische Statistik und Epidemiologie (IMSE) of the Technische Universität München. It offers a big collection of clinical tumor cases located on servers at the provider sites Munich, Erlangen and Würzburg, visualization and interaction similar to a real CT or MRI console, original DICOM data, X-rays and endoscopic and endosonographic videos, and expert-guided tours through the cases. In a first evaluation in summer 1998, 32 medical students graded the application with 1.9 ('good') on a scale from 1 ('very good') to 5 ('very bad'). The textbook supports German language, an English version is in preparation. In a second part, it contains lessons in medical image processing for students of medical informatics. An ODITEB release 2 with several improvements will be finished until February 2000. The use of the textbook is free of cost.

  8. Evaluation of a digital data acquisition system and optimization of n-γ discrimination for a compact neutron spectrometer.

    PubMed

    Giacomelli, L; Zimbal, A; Reginatto, M; Tittelmeier, K

    2011-01-01

    A compact NE213 liquid scintillation neutron spectrometer with a new digital data acquisition (DAQ) system is now in operation at the Physikalisch-Technische Bundesanstalt (PTB). With the DAQ system, developed by ENEA Frascati, neutron spectrometry with high count rates in the order of 5×10(5) s(-1) is possible, roughly an order of magnitude higher than with an analog acquisition system. To validate the DAQ system, a new data analysis code was developed and tests were done using measurements with 14-MeV neutrons made at the PTB accelerator. Additional analysis was carried out to optimize the two-gate method used for neutron and gamma (n-γ) discrimination. The best results were obtained with gates of 35 ns and 80 ns. This indicates that the fast and medium decay time components of the NE213 light emission are the ones that are relevant for n-γ discrimination with the digital acquisition system. This differs from what is normally implemented in the analog pulse shape discrimination modules, namely, the fast and long decay emissions of the scintillating light.

  9. Development and production of a multilayer-coated x-ray reflecting stack for the Athena mission

    NASA Astrophysics Data System (ADS)

    Massahi, S.; Ferreira, D. D. M.; Christensen, F. E.; Shortt, B.; Girou, D. A.; Collon, M.; Landgraf, B.; Barriere, N.; Krumrey, M.; Cibik, L.; Schreiber, S.

    2016-07-01

    The Advanced Telescope for High-Energy Astrophysics, Athena, selected as the European Space Agency's second large-mission, is based on the novel Silicon Pore Optics X-ray mirror technology. DTU Space has been working for several years on the development of multilayer coatings on the Silicon Pore Optics in an effort to optimize the throughput of the Athena optics. A linearly graded Ir/B4C multilayer has been deposited on the mirrors, via the direct current magnetron sputtering technique, at DTU Space. This specific multilayer, has through simulations, been demonstrated to produce the highest reflectivity at 6 keV, which is a goal for the scientific objectives of the mission. A critical aspect of the coating process concerns the use of photolithography techniques upon which we will present the most recent developments in particular related to the cleanliness of the plates. Experiments regarding the lift-off and stacking of the mirrors have been performed and the results obtained will be presented. Furthermore, characterization of the deposited thin-films was performed with X-ray reflectometry at DTU Space and in the laboratory of the Physikalisch-Technische Bundesanstalt at the synchrotron radiation facility BESSY II.

  10. Capabilities and limitations of the self-calibration of angle encoders

    NASA Astrophysics Data System (ADS)

    Geckeler, Ralf D.; Link, Alfred; Krause, Michael; Elster, Clemens

    2014-05-01

    At the Physikalisch-Technische Bundesanstalt (PTB), a self-calibration method for the fast and precise in situ calibration of angle encoders without recourse to external reference standards has been developed. It relies on a suitable geometric arrangement of multiple reading heads which read out the radial grating of the angle encoder at different angular positions. Fourier-based algorithms are used to analyse the measurement differences of pairs of heads to recover the graduation error of the grating. A comprehensive overview, both theoretical and experimental, of the capabilities and limitations of the self-calibration method is presented, including experimental data obtained with the high-precision primary angle standard of PTB. The evaluation and, where it is possible, correction of error influences due to lateral shifts of the centre of the encoder's grating during its rotation, including its eccentricity, the reading heads’ angular positions, and their non-uniform response, are discussed in detail, as well as the resulting uncertainty budget.

  11. The SMU Primary Mercury Manometer and its Comparison with Three Manometers of Different Design

    NASA Astrophysics Data System (ADS)

    Farár, P.; Skrovánek, T.; Faltus, Z.; Chytil, M.

    1994-01-01

    After the CCM Medium Pressure Working Group intercomparison indicated that the SMU primary mercury manometer differed by more than 20 ppm from other national standards, attention was paid to determining and eliminating the possible sources of these deviations. These efforts included replacing or redesigning some of the manometer components. The modified manometer design is presented in this paper. A piston gauge has been calibrated in the absolute mode using nitrogen as a pressure media, with the primary standard manometers at four national standards laboratories: Slovenský Metrologický Ústav (SMU), Bratislava; Amt für Standardisierung, Messwesen und Warenprüfung (ASMW), Berlin; Physikalisch-Technische Bundesanstalt (PTB), Braunschweig; and the National Institute of Standards and Technology (NIST), Gaithersburg; over a period of six years. Each of these manometers is of a different design. This has provided a basis from which to determine how the design changes affect the SMU manometer performance. The results indicate that the previous systematic deviations have been eliminated in the upper pressure ranges. The results for all four manometers agree to within their claimed uncertainties, however at the lowest pressures significant differences still exist and require further investigation.

  12. Primary pressure standards based on dimensionally characterized piston/cylinder assemblies

    NASA Astrophysics Data System (ADS)

    Schmidt, J. W.; Jain, K.; Miiller, A. P.; Bowers, W. J.; Olson, D. A.

    2006-02-01

    NIST has characterized two large diameter (35.8 mm) piston/cylinder assemblies as primary pressure standards in the range 0.05 MPa to 1.0 MPa with uncertainties approaching the best mercury manometers. The realizations of the artefacts as primary standards are based on the dimensional characterization of the piston and cylinder, and models of the normal and shear forces on the base and flanks of the piston. We have studied two piston/cylinder assemblies, known at the National Institute of Standards and Technology (NIST) as PG 38 and PG 39, using these methods. The piston and cylinder of both assemblies were accurately dimensioned by Physikalisch Technische Bundesanstalt (PTB). All artefacts appeared to be round within ±30 nm and straight within ±100 nm over a substantial fraction of their heights. PG 39 was dimensioned a second time by PTB, three years after the initial measurement, and showed no significant change in dimensions or effective area. Comparisons of the effective area of PG 38 and PG 39 from dimensional measurements, against those obtained with calibration against the NIST ultrasonic interferometer manometer (UIM), are in agreement within the combined standard (k = 1) uncertainty of the dimensional measurements and the UIM. A cross-float comparison of PG 38 versus PG 39 also agreed with the dimensional characterization within their combined standard uncertainties and with the UIM calibrations. The expanded (k = 2) relative uncertainty of the effective area is about 6.0 × 10-6 for both assemblies.

  13. Metrological characterization of a 2 kN · m torque standard machine for superposition with axial forces up to 1 MN

    NASA Astrophysics Data System (ADS)

    Baumgarten, Sebastian; Kahmann, H.; Röske, D.

    2016-10-01

    A torque-generating measuring device in the 1 MN force standard machine of Physikalisch-Technische Bundesanstalt allows combined load conditions to be generated. Superposition is possible in measuring ranges from 20 kN to 1 MN for axial load and from 20 N · m to 2 kN · m for torque. The measurement facility is unique in the world and offers the opportunity to characterize multi-component sensors specifically with regard to their signal crosstalk. The expanded relative measurement uncertainty (k  =  2) of the axial force is 2 · 10-5. In the following, the technical details of the torque measuring device and the metrological characterization from the modelling to the measurement uncertainty budget will be described. The model provides an expanded relative measurement uncertainty (k  =  2)  <  3.9 · 10-4. The results of comparison measurements will be discussed.

  14. Novel control scheme for a high-speed metrological scanning probe microscope

    NASA Astrophysics Data System (ADS)

    Vorbringer-Dorozhovets, N.; Hausotte, T.; Manske, E.; Shen, J. C.; Jäger, G.

    2011-09-01

    Some time ago, an interferometer-based metrological scanning probe microscope (SPM) was developed at the Institute of Process Measurement and Sensor Technology of the Ilmenau University of Technology, Germany. The specialty of this SPM is the combined deflection detection system that comprises an interferometer and a beam deflection. Due to this system it is possible to simultaneously measure the displacement, bending and torsion of the probe (cantilever). The SPM is integrated into a nanopositioning and nanomeasuring machine (NPM machine) and allows measurements with a resolution of 0.1 nm over a range of 25 mm × 25 mm × 5 mm. Excellent results were achieved for measurements of calibrated step height and lateral standards and these results are comparable to the calibration values from the Physikalisch-Technische Bundesanstalt (PTB) (Dorozhovets N et al 2007 Proc. SPIE 6616 661624-1-7). The disadvantage was a low attainable scanning speed and accordingly large expenditure of time. Control dynamics and scanning speed are limited because of the high masses of the stage and corner mirror of the machine. For the vertical axis an additional high-speed piezoelectric drive is integrated in the SPM in order to increase the measuring dynamics. The movement of the piezoelectric drive is controlled and traceable measured by the interferometer. Hence, nonlinearity and hysteresis in the actuator do not affect the measurement. The outcome of this is an improvement of the bending control of the cantilever and much higher scan speeds of up to 200 µm s-1.

  15. Mobile decision support for transplantation patient data.

    PubMed

    Krause, Andreas; Hartl, Dominik; Theis, Fabian; Stangl, Manfred; Gerauer, Klaus E; Mehlhorn, Alexander T

    2004-06-15

    In high-critical medical fields instant information delivery is essential. Task-flow analyses within the transplantation unit of the Technische Universität München revealed that valuable time could be saved in pre-transplantation management being able to retrieve data of organ receivers ubiquitously. Inspired by this clinical scenario, a mobile application was designed and implemented providing surgeons with decision-relevant information on potential organ receivers. It assists them in considering the prospects of forthcoming organ transplantations and facilitates decision making and documentation with regard to high security demands. The described system services three organ receiver lists and is used by the surgeons in every transplantation procedure. After a 6-month period of clinical usage, the system has been evaluated in terms of handling, clinical benefit and total time savings. Intuitive, ubiquitous access to decision-relevant patient data and authenticated documentation were the major improvements with average total time savings of 50 min in comparison to the old system.

  16. Radiopurity of CaWO4 crystals for direct dark matter search with CRESST and EURECA

    NASA Astrophysics Data System (ADS)

    Münster, A.; Sivers, M. v.; Angloher, G.; Bento, A.; Bucci, C.; Canonica, L.; Erb, A.; Feilitzsch, F. v.; Gorla, P.; Gütlein, A.; Hauff, D.; Jochum, J.; Kraus, H.; Lanfranchi, J.-C.; Laubenstein, M.; Loebell, J.; Ortigoza, Y.; Petricca, F.; Potzel, W.; Pröbst, F.; Puimedon, J.; Reindl, F.; Roth, S.; Rottler, K.; Sailer, C.; Schäffner, K.; Schieck, J.; Scholl, S.; Schönert, S.; Seidel, W.; Stodolsky, L.; Strandhagen, C.; Strauss, R.; Tanzke, A.; Uffinger, M.; Ulrich, A.; Usherov, I.; Wawoczny, S.; Willers, M.; Wüstrich, M.; Zöller, A.

    2014-05-01

    The direct dark matter search experiment CRESST uses scintillating CaWO4 single crystals as targets for possible WIMP scatterings. An intrinsic radioactive contamination of the crystals as low as possible is crucial for the sensitivity of the detectors. In the past CaWO4 crystals operated in CRESST were produced by institutes in Russia and the Ukraine. Since 2011 CaWO4 crystals have also been grown at the crystal laboratory of the Technische Universität München (TUM) to better meet the requirements of CRESST and of the future tonne-scale multi-material experiment EURECA. The radiopurity of the raw materials and of first TUM-grown crystals was measured by ultra-low background γ-spectrometry. Two TUM-grown crystals were also operated as low-temperature detectors at a test setup in the Gran Sasso underground laboratory. These measurements were used to determine the crystals' intrinsic α-activities which were compared to those of crystals produced at other institutes. The total α-activities of TUM-grown crystals as low as 1.23±0.06 mBq/kg were found to be significantly smaller than the activities of crystals grown at other institutes typically ranging between ~ 15 mBq/kg and ~ 35 mBq/kg.

  17. Simulation of earthquakes on strengthened masonry walls: photogrammetric determination of kinematic shape changes

    NASA Astrophysics Data System (ADS)

    Schwegler, Gregor; Dold, J.

    1994-03-01

    In cooperation with the firm HILTI AG in Schaan the Swiss Federal Laboratories for Materials Testing and Research (EMPA) in Dubendorf, Switzerland is carrying out tests on masonry walls. The goal of these tests is to post-strengthen such walls in seismically endangered zones through the use of fiber-based composites. During the loading, the 3-D deformation behavior of the wall is determined. Each brick is provided with two measurement points. During the measurement phase the masonry wall deforms by up to 0.04 mm due to relaxation. Given a required deformation resolution of at least 0.04 mm, it is therefore necessary to employ a measurement technique that accurately and rapidly ascertains the wall condition in 3-D. In cooperation with the Institut fuer Photogrammetrie und Bildverarbeitung Technische Universitaet Braunschweig it was possible for the first time to employ five large- format Rollei LFC recording cameras synchronously for the deformation measurement. A spatial reconstruction of the wall shape was possible with an average standard deviation of 0.02 mm for the object coordinates in the plane of the wall, resp. 0.03 mm perpendicular to the wall.

  18. Status and plans for the future of the Vienna VLBI Software

    NASA Astrophysics Data System (ADS)

    Madzak, Matthias; Böhm, Johannes; Böhm, Sigrid; Girdiuk, Anastasiia; Hellerschmied, Andreas; Hofmeister, Armin; Krasna, Hana; Kwak, Younghee; Landskron, Daniel; Mayer, David; McCallum, Jamie; Plank, Lucia; Schönberger, Caroline; Shabala, Stanislav; Sun, Jing; Teke, Kamil

    2016-04-01

    The Vienna VLBI Software (VieVS) is a VLBI analysis software developed and maintained at Technische Universität Wien (TU Wien) since 2008 with contributions from groups all over the world. It is used for both academic purposes in university courses as well as for providing VLBI analysis results to the geodetic community. Written in a modular structure in Matlab, VieVS offers easy access to the source code and the possibility to adapt the programs for particular purposes. The new version 2.3, released in December 2015, includes several new parameters to be estimated in the global solution, such as tidal ERP variation coefficients. The graphical user interface was slightly modified for an improved user functionality and, e.g., the possibility of deriving baseline length repeatabilities. The scheduling of satellite observations was refined, the simulator newly includes the effect of source structure which can also be corrected for in the analysis. This poster gives an overview of all VLBI-related activities in Vienna and provides an outlook to future plans concerning the Vienna VLBI Software.

  19. Measurements of Gas-phase H2so4, Oh, So2 and Aerosol Size Distribution On Mount Zugspitze At The Schneefernerhaus: Estimation of Sources and Sinks of Sulfuric Acid

    NASA Astrophysics Data System (ADS)

    Uecker, J.; Hanke, M.; Kamm, S.; Umann, B.; Arnold, F.; Poeschl, U.; Niessner, R.

    Gas-phase sulfuric acid and OH have been measured by the novel MPI-K ULTRA- CIMS (ultra-trace gas detection by CIMS technique) at the Schneefernerhaus( 2750 m asl; below the summit of Mount Zugspitze, Germany) in October 2001. These mea- surements were accompanied by measurements of SO2 with another MPI-K CIMS instrument and aerosol size distribution measurements by DMPS (differential mobil- ity particle sizer) operated by the Institut fuer Wasserchemie (Technische Universitaet Muenchen). In that way a data set was obtained which allows investigating major sources and sinks of sulfuric acid under relative clean conditions. H2SO4 and espe- cially OH concentrations are relatively well correlated to solar flux. Noon maximum concentrations of OH and H2SO4 of 6.5·106 and 2·106 cm-3, respectively, were ob- served. The average SO2 concentrations were below 20 ppt. The aerosol size distribu- tion was obtained in 39 size ranges from 10 to 1056 nm. Typical aerosol concentrations are in the range of 400 to 1800 cm-3 during the discussed period of time. An estima- tion of the production rate of H2SO4 was inferred building on the reaction of SO2 and OH, while the loss rate was calculated by considering the condensation of H2SO4 on aerosol particles (Fuchs and Sutugin approach). Results of the measurements and calculations will be discussed.

  20. Results on the effective area of the FPG-type digital piston manometer of MIKES

    NASA Astrophysics Data System (ADS)

    Rantanen, Markku; Semenoja, Sari

    2005-12-01

    The Centre for Metrology and Accreditation (MIKES) has been using a new type of a digital piston manometer (force-balanced piston gauge (FPG)) since 2001. The instrument was developed by DH Instruments Inc., USA. Determination of the effective area was an essential part in validating the FPG in MIKES. One of the big advantages of the FPG is the fact that a conventional pressure balance can be used to determine the effective area. However, the measurement is not straightforward due to the lubrication gas flow in the FPG. The effective area of the MIKES FPG has now been determined several times in the gauge mode by MIKES, once by NMi-VSL, The Netherlands, once by SP, Sweden, and twice by the manufacturer. Measurements in absolute mode have been made using the mercury column manometer of the Physikalisch-Technische Bundesanstalt, Germany. The measurement methods and the results are described in the paper. The results of measurements in MIKES from 2001 to 2004 illustrate the long-term stability and reproducibility of the instrument.

  1. The Usage of Recursive Parameter Estimation in Automated Reference Point Determination

    NASA Astrophysics Data System (ADS)

    Lossin, Torsten; Lösler, Michael; Neidhardt, Alexander; Lehmann, Rüdiger; Mähler, Swetlana

    2014-12-01

    The Geodetic Observatory Wettzell (GOW) is one of the core stations within the International Earth Rotation and Reference Systems Service (IERS). The research facility is operated by the Federal Agency for Cartography and Geodesy (Bundesamt für Kartographie und Geodäsie, BKG) and the Research Institute for Satellite Geodesy (Forschungseinrichtung Satellitengeodäsie, FESG) of the Technische Universität München (Technical University Munich, TUM). The observatory hosts several geodetic space techniques, including permanent receivers for the Global Navigation Satellite Systems (GNSS), optical telescopes for Satellite Laser Ranging (SLR), and radio telescopes for Very Long Baseline Interferometry (VLBI). To combine these techniques the geodetic reference points of each technique and therefore the relative geometries (local ties) must be known with higher-level accuracy. To enhance the reliability, the Global Geodetic Observing System (GGOS) calls for continuous measurements and automated determination of the reference points. In 2013 the monitoring system HEIMDALL was installed at the GOW to derive the reference point of one of the TWIN radio telescopes in an automated way. Thirty single epochs were carried out from March to July 2013. The results of these epochs were combined by recursive parameter estimation. The advantage of this approach is the consideration of all former results and uncertainties. These combined results enable a reliable assessment to prove the stability of the reference point of the new radio telescope.

  2. Gischig receives 2011 Natural Hazards Focus Group Award for Graduate Research

    NASA Astrophysics Data System (ADS)

    2012-02-01

    Valentin Gischig has been awarded the AGU Natural Hazards Focus Group Award for Graduate Research, given annually to a recent Ph.D. recipient for outstanding contributions to natural hazards research. Gischig's thesis is entitled “Kinematics and failure mechanisms of the Randa rock slope instability (Switzerland).” He presented an invited talk and was formally presented with the award at the 2011 AGU Fall Meeting, held 5-9 December in San Francisco, Calif. Gischig received his M.Sc. in geophysics and glaciology at Eidgenössiche Technische Hochschule (ETH) Zürich, in Switzerland, in 2007. In 2011 he attained a Ph.D. in engineering geology/rock mechanics/landslide analysis under the supervision of Simon Loew, Jeffrey R. Moore, Florian Amann, and Keith F. Evans at ETH Zürich. Gischig is currently conducting postdoctoral research at ETH Zürich. His research interests include landslides, induced seismicity in enhanced geothermal systems, and coupled processes in rock mechanics.

  3. Study of the Smith-Purcell effect in the relativistic regime

    SciTech Connect

    Doucas, G.; Dumitru, M.; Korschinck, G.

    1995-12-31

    We propose to investigate the spontaneous emission of radiation arising out of the interaction of a relativistic electron beam with a metallic grating (the Smith-Purcell effect). The work will concentrate, primarily, in the 50-120 {mu}m part of the infrared spectrum and will be an extension of the work begun by the Oxford-Dartmouth-Essex collaboration; one of the early objectives of the project will be to develop a quantitative understanding of the power spectrum of the emitted radiation over a wide range of emission angles. In particular, the limits of relativistic peaking of forward directed emission will be investigated. The electron beam will be produced by laser irradiation of a metallic cathode in the terminal of a small Van de Graff accelerator located in the Technische Universitaet, Muenchen. Beam energies will be in the range of 2 - 4 MeV. Initial tests on photoproduction of electrons have yielded 10 mA pulses with a width of about 20 ns. The electron pulse length is long enough to not only produce easily observed levels of spontaneous emission, but in principle gain due to stimulated emission should also be observable. Observation of gain is a second goal of the project. The manufacture of the grating chamber and the voltage tests on the accelerator will progress in parallel. This is a 3-year project and is supported, in part, by the British-German Academic Research Collaboration (ARC) program.

  4. High-energy response of the PRESCILA and WENDI-II neutron rem meters.

    PubMed

    Olsher, Richard H; McLean, Thomas D

    2008-01-01

    WENDI-II was designed at the Los Alamos National Laboratory (LANL) specifically as a wide-range rem meter, suitable for applications at particle accelerators, with response extension to 5 GeV. PRESCILA was also designed at LANL, mainly as a lightweight alternative to traditional rem meters, but has shown excellent response characteristics above 20 MeV. This Note summarises measurements performed over a span of 4 y to characterise the high-energy neutron response (>20 MeV) of these meters to several hundred million electron volts. High-energy quasi-monoenergetic beams utilised as part of this study were produced by the cyclotron facilities at the Université Catholique de Louvain (33 and 60 MeV) and the T. Svedberg Laboratory ( 46, 95, 143 and 173 MeV). In addition, measurements were also conducted at the Los Alamos Neutron Science Center, 800 MeV spallation neutron source, in broad energy fields with an average energy of 345 MeV. For the sake of completeness, data collected between 2.5 and 19 MeV in monoenergetic neutron fields at the German Physikalisch-Technische Bundesanstalt (PTB) facility are also included in this study.

  5. Remote atomic clock synchronization via satellites and optical fibers

    NASA Astrophysics Data System (ADS)

    Piester, D.; Rost, M.; Fujieda, M.; Feldmann, T.; Bauch, A.

    2011-07-01

    In the global network of institutions engaged with the realization of International Atomic Time (TAI), atomic clocks and time scales are compared by means of the Global Positioning System (GPS) and by employing telecommunication satellites for two-way satellite time and frequency transfer (TWSTFT). The frequencies of the state-of-the-art primary caesium fountain clocks can be compared at the level of 10-15 (relative, 1 day averaging) and time scales can be synchronized with an uncertainty of one nanosecond. Future improvements of worldwide clock comparisons will require also an improvement of the local signal distribution systems. For example, the future ACES (atomic clock ensemble in space) mission shall demonstrate remote time scale comparisons at the uncertainty level of 100 ps. To ensure that the ACES ground instrument will be synchronized to the local time scale at the Physikalisch-Technische Bundesanstalt (PTB) without a significant uncertainty contribution, we have developed a means for calibrated clock comparisons through optical fibers. An uncertainty below 40 ps over a distance of 2 km has been demonstrated on the campus of PTB. This technology is thus in general a promising candidate for synchronization of enhanced time transfer equipment with the local realizations of Coordinated Universal Time UTC. Based on these experiments we estimate the uncertainty level for calibrated time transfer through optical fibers over longer distances. These findings are compared with the current status and developments of satellite based time transfer systems, with a focus on the calibration techniques for operational systems.

  6. An approach to an accurate determination of the energy spectrum of high-energy electron beams using magnetic spectrometry

    NASA Astrophysics Data System (ADS)

    Renner, F.; Schwab, A.; Kapsch, R.-P.; Makowski, Ch; Jannek, D.

    2014-03-01

    At the national metrology institute of Germany, the Physikalisch-Technische Bundesanstalt, a research accelerator for dosimetry in radiation therapy has been installed. Magnetic spectrometry is used to determine the spectrum of high-energy electrons generated by this accelerator. Regarding the intended experiments at the accelerator, a high accuracy for the energy determination of the electron beam is required. For this purpose, an experimental setup is used that has a number of additional devices assembled around the spectrometer to determine geometric characteristics of the electron beam, which influence the energy analysis. For the analysis of the acquired data, a software was developed which meets specific needs. One important aspect is that the software is based on an algorithm for energy determination which considers the measured magnetic flux density of the spectrometer and geometric details of the beam and the spectrometer. The software also meets the demand that it can be used to estimate the uncertainty assigned to the energy. This paper covers the experimental and analytical background of magnetic spectrometry at the high-energy beamline of PTB's research accelerator. A comparison of results calculated with the specific algorithm for energy determination which was developed for this experimental setup and with well-known algorithms is given to show the advantage of the specific method. Results of measurements and their analysis with the algorithm are presented as well.

  7. Calibration of the GLAST Burst Monitor detectors

    SciTech Connect

    Kienlin, Andreas von; Bissaldi, Elisabetta; Lichti, Giselher G.; Steinle, Helmut; Diehl, Roland; Greiner, Jochen; Krumrey, Michael; Gerlach, Martin; Fishman, Gerald J.; Meegan, Charles; Kouveliotou, Chryssa; Wilson-Hodge, Colleen; Bhat, Narayana; Briggs, Michael S.; Connaughton, Valerie; Paciesas, William; Preece, Robert; Kippen, R. Marc

    2007-07-12

    The GLAST Burst Monitor (GBM) will augment the capabilities of GLAST for the detection of cosmic gamma-ray bursts by extending the energy range (20 MeV to > 300 GeV) of the Large Area Telescope (LAT) towards lower energies by 2 BGO-detectors (150 keV to 30 MeV) and 12 NaI(Tl) detectors (10 keV to 1 MeV). The physical detector response of the GBM instrument for GRBs is determined with the help of Monte Carlo simulations, which are supported and verified by on-ground calibration measurements, performed extensively with the individual detectors at the MPE in 2005. All flight and spare detectors were irradiated with calibrated radioactive sources in the laboratory (from 14 keV to 4.43 MeV). The energy/channel-relations, the dependences of energy resolution and effective areas on the energy and the angular responses were measured. Due to the low number of emission lines of radioactive sources below 100 keV, calibration measurements in the energy range from 10 keV to 60 keV were performed with the X-ray radiometry working group of the Physikalisch-Technische Bundesanstalt (PTB) at the BESSY synchrotron radiation facility, Berlin.

  8. Calibration of the GLAST Burst Monitor Detectors

    SciTech Connect

    von Kienlin, Andreas; Bissaldi, Elisabetta; Lichti, Giselher G.; Steinle, Helmut; Krumrey, Michael; Gerlach, Martin; Fishman, Gerald J.; Meegan, Charles; Bhat, Narayana; Briggs, Michael S.; Diehl, Roland; Connaughton, Valerie; Greiner, Jochen; Kippen, R.Marc; Kouveliotou, Chryssa; Paciesas, William; Preece, Robert; Wilson-Hodge, Colleen

    2011-11-29

    The GLAST Burst Monitor (GBM) will augment the capabilities of GLAST for the detection of cosmic gamma-ray bursts by extending the energy range (20 MeV to > 300 GeV) of the Large Area Telescope (LAT) towards lower energies by 2 BGO-detectors (150 keV to 30 MeV) and 12 NaI(Tl) detectors (10 keV to 1 MeV). The physical detector response of the GBM instrument for GRBs is determined with the help of Monte Carlo simulations, which are supported and verified by on-ground calibration measurements, performed extensively with the individual detectors at the MPE in 2005. All flight and spare detectors were irradiated with calibrated radioactive sources in the laboratory (from 14 keV to 4.43 MeV). The energy/channel-relations, the dependences of energy resolution and effective areas on the energy and the angular responses were measured. Due to the low number of emission lines of radioactive sources below 100 keV, calibration measurements in the energy range from 10 keV to 60 keV were performed with the X-ray radiometry working group of the Physikalisch-Technische Bundesanstalt (PTB) at the BESSY synchrotron radiation facility, Berlin.

  9. Application of a positioning and measuring machine for metrological long-range scanning force microscopy

    NASA Astrophysics Data System (ADS)

    Hausotte, T.; Jaeger, G.; Manske, E.; Hofmann, N.; Dorozhovets, N.

    2005-08-01

    This article deals with a high-precision three-dimensional positioning and measuring machine and its application as a metrological long-range scanning force microscope. At the Institute of Process Measurement and Sensor Technology of the Technische Universitaet Ilmenau an interferometric nanopositioning and nanomeasuring machine has been developed. Which is able to achieve a resolution of less than 0.1 nm over the entire positioning and measurement range of 25 mm x 25 mm x 5 mm and is traceable to the length standard. The Abbe offset-free design in conjunction with a corner mirror as a reference coordinate system provides extraordinary accuracy. The integration of several probe systems and nanotools (AFM, STM, focus sensor, tactile probes) makes the nanopositioning and nanomeasuring machine suitable for various tasks in the micro- and nanotechnologies. Various probe systems have been integrated in the last few years. For example, a commercial piezo tube AFM was integrated and tested. Additionally, interferometeric measurement systems of the nanopositioning and nanomeasuring machine enables the calibration of probe systems. Also in order to achieve the best possible measurement results special probe systems have been developed and tested and are discussed briefly.

  10. Research on new dynamic force calibration system

    NASA Astrophysics Data System (ADS)

    Zhang, Li

    2008-06-01

    Sinusoidal force calibration method based on electrodynamic shaker and interferometric system was studied several years before at Physikalisch-Technische Bundesanstalt (PTB). In that system a load mass are screwed on the top of force transducer, the sinusoidal forces realized by accelerated load masses are traceable to acceleration and mass according to the force definition F(t) = ma(t), where m is the total mass acting on the sensing element of the force transducer and a is the time and spatial-dependent acceleration of the mass, which is directly measured by a laser interferometer. This paper will introduce a new dynamic force calibration system developed at Changcheng Institute of Metrology and Measurement (CIMM). It uses electrodynamic shakers to generate dynamic force in the range from 1N to 20kN, and heterodyne laser interferometers are used for acceleration measurement. A new air bearing system is developed to increase the performance of shakers and an active vibration isolator is used to reduce enviromental disturbance to the interferometric system.

  11. Block sparsity-based joint compressed sensing recovery of multi-channel ECG signals.

    PubMed

    Singh, Anurag; Dandapat, Samarendra

    2017-04-01

    In recent years, compressed sensing (CS) has emerged as an effective alternative to conventional wavelet based data compression techniques. This is due to its simple and energy-efficient data reduction procedure, which makes it suitable for resource-constrained wireless body area network (WBAN)-enabled electrocardiogram (ECG) telemonitoring applications. Both spatial and temporal correlations exist simultaneously in multi-channel ECG (MECG) signals. Exploitation of both types of correlations is very important in CS-based ECG telemonitoring systems for better performance. However, most of the existing CS-based works exploit either of the correlations, which results in a suboptimal performance. In this work, within a CS framework, the authors propose to exploit both types of correlations simultaneously using a sparse Bayesian learning-based approach. A spatiotemporal sparse model is employed for joint compression/reconstruction of MECG signals. Discrete wavelets transform domain block sparsity of MECG signals is exploited for simultaneous reconstruction of all the channels. Performance evaluations using Physikalisch-Technische Bundesanstalt MECG diagnostic database show a significant gain in the diagnostic reconstruction quality of the MECG signals compared with the state-of-the art techniques at reduced number of measurements. Low measurement requirement may lead to significant savings in the energy-cost of the existing CS-based WBAN systems.

  12. Comparison measurements of 0:45 radiance factor and goniometrically determined diffuse reflectance

    SciTech Connect

    Holopainen, Silja; Manoocheri, Farshid; Ikonen, Erkki; Hauer, Kai-Olaf; Hoepe, Andreas

    2009-05-20

    A comparison between the absolute gonioreflectometric scales at the Helsinki University of Technology (TKK) and the Physikalisch-Technische Bundesanstalt (PTB) has been accomplished. Six different reflection standards were measured for their 0:45 spectral radiance factor between 250 and 1650 nm in 10 nm intervals. Also, the 0:d reflectance factor between 400 and 1600 nm in 100 nm intervals was determined from goniometric reflectance measurements over polar angles with subsequent integration within the hemisphere above the sample. Goniometric comparisons covering such an extensive wavelength range and also several different sample materials are rarely implemented. For all but one sample, the difference between the results obtained at the TKK and the PTB was, with the exception of a couple of measurement points, within the expanded uncertainty (k=2) of the comparison at least up to a wavelength of 1400 nm. All differences between the measurement results can be understood, except for one translucent sample in the visible wavelength range. The effect of sample translucency was found to be significant in the NIR wavelength region. Also, a general tendency of an increase of the TKK values relative to the PTB values in the UV region was observed. Possible causes for this phenomenon are discussed.

  13. Concepts for VLBI Station Control as Part of NEXPReS

    NASA Astrophysics Data System (ADS)

    Ettl, M.; Neidhardt, A.; Schönberger, M.; Alef, W.; Himwich, E.; Beaudoin, C.; Plötz, C.; Lovell, J.; Hase, H.

    2012-12-01

    In the Novel EXploration Pushing Robust e-VLBI Services-project (NEXPReS) the Technische Universität München (TUM) realizes concepts for continuous quality monitoring and station remote control in cooperation with the Max-Planck-Institute for Radio Astronomy, Bonn. NEXPReS is a three-year project, funded within the European Seventh Framework program. It is aimed to develop e-VLBI services for the European VLBI Network (EVN), which can also support the IVS observations (VLBI2010). Within this project, the TUM focuses on developments of an operational remote control system (e-RemoteCtrl) with authentication and authorization. It includes an appropriate role management with different remote access states for future observation strategies. To allow a flexible control of different systems in parallel, sophisticated graphical user interfaces are designed and realized. The software is currently under test in the new AuScope network, Australia/New Zealand. Additional system parameters and information are collected with a new system monitoring (SysMon) for a higher degree of automation, which is currently under preparation for standardization within the IVS Monitoring and Control Infrastructure (MCI) Collaboration Group. The whole system for monitoring and control is fully compatible with the NASA Field System and extends it.

  14. High-energy response of passive dosemeters in use at LANL.

    PubMed

    Olsher, Richard H; McLean, Thomas D; Mallett, Michael W; Romero, Leonard L; Devine, Robert T; Hoffman, Jeffrey M

    2007-01-01

    The high-energy neutron response of three passive dosemeters in use at the Los Alamos National Laboratory (LANL) has been investigated using metrology-grade fields. The dosemeters include the LANL Model 8823 TLD badge and the LANL PN3 track etch device. Both are dosemeters of record at LANL. The third device was the Personal Neutron Dosemeter (PND), a superheated emulsion device, manufactured by Bubble Technology Industries, Inc. (BTI). The response of the three dosemeters at neutron energies exceeding 10 MeV was assessed with monoenergetic neutrons at the Physikalisch-Technische Bundesanstalt facility (14.8 and 19 MeV). For the sake of completeness, data collected at lower energies are also included in this study. High-energy quasi-monoenergetic beams produced by the cyclotron facilities at the Université Catholique de Louvain (UCL) and the The Svedberg Laboratory (TSL) were also utilised as part of this study. These measurements were made to better understand and help interpret dosemeter readings obtained by workers at high-energy accelerators, such as the 800 MeV spallation neutron source facility located at the Los Alamos Neutron Science Center (LANSCE).

  15. Simulation of a GOX-kerosene subscale rocket combustion chamber

    NASA Astrophysics Data System (ADS)

    Höglauer, Christoph; Kniesner, Björn; Knab, Oliver; Kirchberger, Christoph; Schlieben, Gregor; Kau, Hans-Peter

    2011-12-01

    In view of future film cooling tests at the Institute for Flight Propulsion (LFA) at Technische Universität München, the Astrium in-house spray combustion CFD tool Rocflam-II was validated against first test data gained from this rocket test bench without film cooling. The subscale rocket combustion chamber uses GOX and kerosene as propellants which are injected through a single double swirl element. Especially the modeling of the double swirl element and the measured wall roughness were adapted on the LFA hardware. Additionally, new liquid kerosene fluid properties were implemented and verified in Rocflam-II. Also the influences of soot deposition and hot gas radiation on the wall heat flux were analytically and numerically estimated. In context of reviewing the implemented evaporation model in Rocflam-II, the binary diffusion coefficient and its pressure dependency were analyzed. Finally simulations have been performed for different load points with Rocflam-II showing a good agreement compared to test data.

  16. Determination of allowable fluid temperature during start-up operation of outlet header under the assumption of constant and temperature-dependent material properties

    NASA Astrophysics Data System (ADS)

    Rząsa, Dariusz; Duda, Piotr

    2013-09-01

    Modern supercritical power plants operate at very high temperatures and pressures. Thus the construction elements are subjected to both high thermal and mechanical loads. As a result high stresses in those components are created. In order to operate safely, it is important to monitor stresses, especially during start-up and shut-down processes. The maximum stresses in the construction elements should not exceed the allowable stresses that are defined according to boiler regulations. It is important to find optimum operating parameters, that can assure safe heating and cooling processes. The optimum parameters define temperature and pressure histories that can keep the highest stresses within allowable limit and reduce operation time as much as possible. In this paper a new numerical method for determining optimum working fluid parameters is presented. In this method, properties of steel can be assumed as constant or temperature dependent. The constant value is taken usually at the average temperature of the operation cycle. For both cases optimal parameters are determined. Based on these parameters start-up operations for both cases are conducted. During entire processes stresses in the heated element are monitored. The results obtained are compared with German boiler regulations - Technische Regeln fur Dampfkessel 301.

  17. Accelerometer-based estimation and modal velocity feedback vibration control of a stress-ribbon bridge with pneumatic muscles

    NASA Astrophysics Data System (ADS)

    Liu, Xiaohan; Schauer, Thomas; Goldack, Arndt; Bleicher, Achim; Schlaich, Mike

    2016-09-01

    Lightweight footbridges are very elegant but also prone to vibration. By employing active vibration control, smart footbridges could accomplish not only the architectural concept but also the required serviceability and comfort. Inertial sensors such as accelerometers allow the estimation of nodal velocities and displacements. A Kalman filter together with a band-limited multiple Fourier linear combiner (BMFLC) is applied to enable a drift-free estimation of these signals for the quasi-periodic motion under pedestrian excitation without extra information from other kinds of auxiliary sensors. The modal velocities of the structure are determined by using a second Kalman filter with the known applied actuator forces as inputs and the estimated nodal displacement and velocities as measurements. The obtained multi-modal velocities are then used for feedback control. An ultra-lightweight stress-ribbon footbridge built in the Peter-Behrens- Halle at the Technische Universitat Berlin served as the research object. Using two inertial sensors in optimal points we can estimate the dominant modal characteristics of this bridge. Real-time implementation and evaluation results of the proposed estimator will be presented in comparison to signals derived from classical displacement encoders. The real-time estimated modal velocities were applied in a multi-modal velocity feedback vibration control scheme with lightweight pneumatic muscle actuators. Experimental results demonstrate the feasibility of using inertial sensors for active vibration control of lightweight footbridges.

  18. (Depth-dose curves of the beta reference fields (147)Pm, (85)Kr and (90)Sr/(90)Y produced by the beta secondary standard BSS2.

    PubMed

    Brunzendorf, Jens

    2012-08-01

    The most common reference fields in beta dosimetry are the ISO 6980 series 1 radiation fields produced by the beta secondary standard BSS2 and its predecessor BSS. These reference fields require sealed beta radiation sources ((147)Pm, (85)Kr or (90)Sr/(90)Y) in combination with a source-specific beam-flattening filter, and are defined only at a given distance from the source. Every radiation sources shipped with the BSS2 is sold with a calibration certificate of the Physikalisch-Technische Bundesanstalt. The calibration workflow also comprises regular depth-dose measurements. This work publishes complete depth-dose curves of the series 1 sources (147)Pm, (85)Kr and (90)Sr/(90)Y in ICRU tissue up to a depth of 11 mm,when all electrons are stopped. For this purpose, the individual depth-dose curves of all BSS2 sources calibrated so far have been determined, i.e. the complete datasets of all BSS2 beta sources have been re-evaluated. It includes 191 depth-dose curves of 116 different sources comprising more than 2200 data points in total. Appropriate analytical representations of the nuclide-specific depth-dose curves are provided for the first time.

  19. Anomalous broadening in driven dissipative Rydberg systems

    NASA Astrophysics Data System (ADS)

    Boulier, Thomas; Goldschmidt, Elizabeth; Brown, Roger; Koller, Silvio; Young, Jeremy; Gorshkov, Alexey; Rolston, Steven; Porto, James

    2016-05-01

    Due to their strong, long-range, coherently-controllable interactions, Rydberg atoms have been proposed as a basis for quantum information processing and simulation of many-body physics. Using the coherent dynamics of such highly excited atomic states, however, requires addressing challenges posed by the dense spectrum of Rydberg levels, the detrimental effects of spontaneous emission, and strong interactions. We report the observation of interaction-induced broadening of the two-photon 5s-18s Rydberg transition in ultra-cold 87Rb atoms, trapped in a 3D optical lattice. The measured linewidth increases by nearly two orders of magnitude with increasing atomic density and excitation strength, with corresponding suppression of resonant scattering and enhancement of off-resonant scattering. We attribute the increased linewidth to resonant dipole-dipole interactions of 18s atoms with spontaneously created populations of nearby Rydberg p-states. This dephasing mechanism implies that the timescales available for the coherent addressing of such systems are dramatically shortened, hampering many recent proposals to use Rydberg-dressed atoms for quantum simulation. Now at Physikalisch-Technische Bundesanstalt.

  20. Time-resolved fast-neutron radiography of air-water two-phase flows in a rectangular channel by an improved detection system

    SciTech Connect

    Zboray, Robert; Dangendorf, Volker; Bromberger, Benjamin; Tittelmeier, Kai; Mor, Ilan

    2015-07-15

    In a previous work, we have demonstrated the feasibility of high-frame-rate, fast-neutron radiography of generic air-water two-phase flows in a 1.5 cm thick, rectangular flow channel. The experiments have been carried out at the high-intensity, white-beam facility of the Physikalisch-Technische Bundesanstalt, Germany, using an multi-frame, time-resolved detector developed for fast neutron resonance radiography. The results were however not fully optimal and therefore we have decided to modify the detector and optimize it for the given application, which is described in the present work. Furthermore, we managed to improve the image post-processing methodology and the noise suppression. Using the tailored detector and the improved post-processing, significant increase in the image quality and an order of magnitude lower exposure times, down to 3.33 ms, have been achieved with minimized motion artifacts. Similar to the previous study, different two-phase flow regimes such as bubbly slug and churn flows have been examined. The enhanced imaging quality enables an improved prediction of two-phase flow parameters like the instantaneous volumetric gas fraction, bubble size, and bubble velocities. Instantaneous velocity fields around the gas enclosures can also be more robustly predicted using optical flow methods as previously.

  1. Aperture alignment in autocollimator-based deflectometric profilometers

    SciTech Connect

    Geckeler, R. D. Just, A.; Kranz, O.; Artemiev, N. A.; Barber, S. K.; Lacey, I.; Yashchuk, V. V.; Smith, B. V.

    2016-05-15

    During the last ten years, deflectometric profilometers have become indispensable tools for the precision form measurement of optical surfaces. They have proven to be especially suitable for characterizing beam-shaping optical surfaces for x-ray beamline applications at synchrotrons and free electron lasers. Deflectometric profilometers use surface slope (angle) to assess topography and utilize commercial autocollimators for the contactless slope measurement. To this purpose, the autocollimator beam is deflected by a movable optical square (or pentaprism) towards the surface where a co-moving aperture limits and defines the beam footprint. In this paper, we focus on the precise and reproducible alignment of the aperture relative to the autocollimator’s optical axis. Its alignment needs to be maintained while it is scanned across the surface under test. The reproducibility of the autocollimator’s measuring conditions during calibration and during its use in the profilometer is of crucial importance to providing precise and traceable angle metrology. In the first part of the paper, we present the aperture alignment procedure developed at the Advanced Light Source, Lawrence Berkeley National Laboratory, USA, for the use of their deflectometric profilometers. In the second part, we investigate the topic further by providing extensive ray tracing simulations and calibrations of a commercial autocollimator performed at the Physikalisch-Technische Bundesanstalt, Germany, for evaluating the effects of the positioning of the aperture on the autocollimator’s angle response. The investigations which we performed are crucial for reaching fundamental metrological limits in deflectometric profilometry.

  2. The Hipparcos project at TPD

    NASA Astrophysics Data System (ADS)

    van Agthoven, H. J.; Bokhove, H.

    1988-04-01

    An overview of the 2.5-year mission of the ESA Hipparcos astrometric satellite is given, and the contributions of the Technisch Physische Dienst (TPD) are discussed. The aim of the Hipparcos mission proper is to obtain the locations and proper motions of 100,000 stars to a limit of 13 mag in the 350-750-nm range and with accuracy (at 9 mag) of 2 marcsec in position and trigonometric parallax and 2 marcsec/yr in motion; the complementary Tycho mission involves BV photometry of 400,000 stars to 10-11 mag with accuracy 0.05 mag. The major payload component is a 290-mm-primary Schmidt telescope capable of observing two 0.9-deg-sq fields simultaneously. The TPD was responsible for the focal-plane grid assembly, the internal star-pattern assembly for the Tycho star mapper, and the refocusing mechanism. Photographs of these components are provided, and the problems posed by stray light are considered.

  3. Toward a standard reference database for computer-aided mammography

    NASA Astrophysics Data System (ADS)

    Oliveira, Júlia E. E.; Gueld, Mark O.; de A. Araújo, Arnaldo; Ott, Bastian; Deserno, Thomas M.

    2008-03-01

    Because of the lack of mammography databases with a large amount of codified images and identified characteristics like pathology, type of breast tissue, and abnormality, there is a problem for the development of robust systems for computer-aided diagnosis. Integrated to the Image Retrieval in Medical Applications (IRMA) project, we present an available mammography database developed from the union of: The Mammographic Image Analysis Society Digital Mammogram Database (MIAS), The Digital Database for Screening Mammography (DDSM), the Lawrence Livermore National Laboratory (LLNL), and routine images from the Rheinisch-Westfälische Technische Hochschule (RWTH) Aachen. Using the IRMA code, standardized coding of tissue type, tumor staging, and lesion description was developed according to the American College of Radiology (ACR) tissue codes and the ACR breast imaging reporting and data system (BI-RADS). The import was done automatically using scripts for image download, file format conversion, file name, web page and information file browsing. Disregarding the resolution, this resulted in a total of 10,509 reference images, and 6,767 images are associated with an IRMA contour information feature file. In accordance to the respective license agreements, the database will be made freely available for research purposes, and may be used for image based evaluation campaigns such as the Cross Language Evaluation Forum (CLEF). We have also shown that it can be extended easily with further cases imported from a picture archiving and communication system (PACS).

  4. Higher-order ionosphere modeling for CODE's next reprocessing activities

    NASA Astrophysics Data System (ADS)

    Lutz, S.; Schaer, S.; Meindl, M.; Dach, R.; Steigenberger, P.

    2009-12-01

    CODE (the Center for Orbit Determination in Europe) is a joint venture between the Astronomical Institute of the University of Bern (AIUB, Bern, Switzerland), the Federal Office of Topography (swisstopo, Wabern, Switzerland), the Federal Agency for Cartography and Geodesy (BKG, Frankfurt am Main, Germany), and the Institut für Astronomische und Phsyikalische Geodäsie of the Technische Universität München (IAPG/TUM, Munich, Germany). It acts as one of the global analysis centers of the International GNSS Service (IGS) and participates in the first IGS reprocessing campaign, a full reanalysis of GPS data collected since 1994. For a future reanalyis of the IGS data it is planned to consider not only first-order but also higher-order ionosphere terms in the space geodetic observations. There are several works (e.g. Fritsche et al. 2005), which showed a significant and systematic influence of these effects on the analysis results. The development version of the Bernese Software used at CODE is expanded by the ability to assign additional (scaling) parameters to each considered higher-order ionosphere term. By this, each correction term can be switched on and off on normal-equation level and, moreover, the significance of each correction term may be verified on observation level for different ionosphere conditions.

  5. Final report on the key comparison CCM.P-K4.2012 in absolute pressure from 1 Pa to 10 kPa

    NASA Astrophysics Data System (ADS)

    Ricker, Jacob; Hendricks, Jay; Bock, Thomas; Dominik, Pražák; Kobata, Tokihiko; Torres, Jorge; Sadkovskaya, Irina

    2017-01-01

    The report summarizes the Consultative Committee for Mass (CCM) key comparison CCM.P-K4.2012 for absolute pressure spanning the range of 1 Pa to 10 000 Pa. The comparison was carried out at six National Metrology Institutes (NMIs), including National Institute of Standards and Technology (NIST), Physikalisch-Technische Bundesanstalt (PTB), Czech Metrology Institute (CMI), National Metrology Institute of Japan (NMIJ), Centro Nacional de Metrología (CENAM), and DI Mendeleyev Institute for Metrology (VNIIM). The comparison was made via a calibrated transfer standard measured at each of the NMIs facilities using their laboratory standard during the period May 2012 to September 2013. The transfer package constructed for this comparison preformed as designed and provided a stable artifact to compare laboratory standards. Overall the participants were found to be statistically equivalent to the key comparison reference value. Main text To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

  6. Comparison of the NIST and PTB Air-Kerma Standards for Low-Energy X-Rays.

    PubMed

    O'Brien, Michelle; Bueermann, Ludwig

    2009-01-01

    A comparison has been made of the air-kerma standards for low-energy x rays at the National Institute of Standards and Technology (NIST) and the Physikalisch-Technische Bundesanstalt (PTB). The comparison involved a series of measurements at the PTB and the NIST using the air-kerma standards and two NIST reference-class transfer ionization chamber standards. Results are presented for the reference radiation beam qualities in the range from 25 kV to 50 kV for low energy x rays, including the techniques used for mammography dose traceability. The tungsten generated reference radiation qualities, between 25 kV and 50 kV used for this comparison, are new to NIST; therefore this comparison will serve as the preliminary comparison for NIST and a verification of the primary standard correction factors. The mammography comparison will repeat two previously unpublished comparisons between PTB and NIST. The results show the standards to be in reasonable agreement within the standard uncertainty of the comparison of about 0.4 %.

  7. Comparison of line width calibration using critical dimension atomic force microscopes between PTB and NIST

    NASA Astrophysics Data System (ADS)

    Dai, Gaoliang; Hahm, Kai; Bosse, Harald; Dixson, Ronald G.

    2017-06-01

    International comparisons between National Metrology Institutes are important to verify measurement results and the associated uncertainties. In this paper, we report a comparison of the line width calibration of a crystalline silicon line width standard, referred to as IVPS100-PTB standard, between the Physikalisch-Technische Bundesanstalt in Germany and the National Institute of Standards and Technology in the United States. Critical dimension atomic force microscopy was the measurement method used for this comparison. Both institutes applied generally the same but independently developed traceability pathways: the scaling factor of the atomic force microscope (AFM) scanner was calibrated by a set of step height and lateral standards certified by metrological AFMs, while the effective tip width was ultimately traceable to the lattice parameter of silicon via high resolution transmission electron microscopy. Good agreement has been achieved in the comparison: For two groups of line features with nominal critical dimensions (CDs) of 50 nm, 70 nm, 90 nm, 110 nm and 130 nm that were compared, the observed deviations of CD results were between  -1.5 nm and 0.3 nm. The deviations are well within the associated measurement uncertainty.

  8. A New Solar Spectrum from 656 to 3088 nm

    NASA Astrophysics Data System (ADS)

    Meftah, M.; Damé, L.; Bolsée, D.; Pereira, N.; Sluse, D.; Cessateur, G.; Irbah, A.; Sarkissian, A.; Djafer, D.; Hauchecorne, A.; Bekki, S.

    2017-08-01

    The solar spectrum is a key parameter for different scientific disciplines such as solar physics, climate research, and atmospheric physics. The SOLar SPECtrometer (SOLSPEC) instrument of the Solar Monitoring Observatory (SOLAR) payload onboard the International Space Station (ISS) has been built to measure the solar spectral irradiance (SSI) from 165 to 3088 nm with high accuracy. To cover the full wavelength range, three double-monochromators with concave gratings are used. We present here a thorough analysis of the data from the third channel/double-monochromator, which covers the spectral range between 656 and 3088 nm. A new reference solar spectrum is therefore obtained in this mainly infrared wavelength range (656 to 3088 nm); it uses an absolute preflight calibration performed with the blackbody of the Physikalisch-Technische Bundesanstalt (PTB). An improved correction of temperature effects is also applied to the measurements using in-flight housekeeping temperature data of the instrument. The new solar spectrum (SOLAR-IR) is in good agreement with the ATmospheric Laboratory for Applications and Science (ATLAS 3) reference solar spectrum from 656 nm to about 1600 nm. However, above 1600 nm, it agrees better with solar reconstruction models than with spacecraft measurements. The new SOLAR/SOLSPEC measurement of solar spectral irradiance at about 1600 nm, corresponding to the minimum opacity of the solar photosphere, is 248.08 ± 4.98 mW m-2 nm-1 (1 σ), which is higher than recent ground-based evaluations.

  9. A multichannel decision-level fusion method for T wave alternans detection

    NASA Astrophysics Data System (ADS)

    Ye, Changrong; Zeng, Xiaoping; Li, Guojun; Shi, Chenyuan; Jian, Xin; Zhou, Xichuan

    2017-09-01

    Sudden cardiac death (SCD) is one of the most prominent causes of death among patients with cardiac diseases. Since ventricular arrhythmia is the main cause of SCD and it can be predicted by T wave alternans (TWA), the detection of TWA in the body-surface electrocardiograph (ECG) plays an important role in the prevention of SCD. But due to the multi-source nature of TWA, the nonlinear propagation through thorax, and the effects of the strong noises, the information from different channels is uncertain and competitive with each other. As a result, the single-channel decision is one-sided while the multichannel decision is difficult to reach a consensus on. In this paper, a novel multichannel decision-level fusion method based on the Dezert-Smarandache Theory is proposed to address this issue. Due to the redistribution mechanism for highly competitive information, higher detection accuracy and robustness are achieved. It also shows promise to low-cost instruments and portable applications by reducing demands for the synchronous sampling. Experiments on the real records from the Physikalisch-Technische Bundesanstalt diagnostic ECG database indicate that the performance of the proposed method improves by 12%-20% compared with the one-dimensional decision method based on the periodic component analysis.

  10. List of Participants

    NASA Astrophysics Data System (ADS)

    2008-11-01

    Mohab Abou ZeidInstitut des Hautes Études Scientifiques, Bures-sur-Yvette Ido AdamMax-Planck-Institut für Gravitationsphysik (AEI), Potsdam Henrik AdorfLeibniz Universität Hannover Mohammad Ali-AkbariIPM, Tehran Antonio Amariti Università di Milano-Bicocca Nicola Ambrosetti Université de Neuchâtel Martin Ammon Max-Planck-Institut für Physik, München Christopher AndreyÉcole Polytechnique Fédérale de Lausanne (EPFL) Laura AndrianopoliPolitecnico di Torino David AndriotLPTHE, Université UPMC Paris VI Carlo Angelantonj Università di Torino Pantelis ApostolopoulosUniversitat de les Illes Balears, Palma Gleb ArutyunovInstitute for Theoretical Physics, Utrecht University Davide AstolfiUniversità di Perugia Spyros AvramisUniversité de Neuchâtel Mirela BabalicChalmers University, Göteborg Foday BahDigicom Ioannis Bakas University of Patras Igor BandosUniversidad de Valencia Jose L F BarbonIFTE UAM/CSIC Madrid Till BargheerMax-Planck-Institut für Gravitationsphysik (AEI), Potsdam Marco Baumgartl Eidgenössische Technische Hochschule (ETH), Zürich James BedfordImperial College London Raphael BenichouLaboratoire de Physique Théorique, École Normale Supérieure, Paris Francesco Benini SISSA, Trieste Eric Bergshoeff Centre for Theoretical Physics, University of Groningen Alice BernamontiVrije Universiteit, Brussel Julia BernardLaboratoire de Physique Théorique, École Normale Supérieure, Paris Adel Bilal Laboratoire de Physique Théorique, École Normale Supérieure, Paris Marco Billo' Università di Torino Matthias Blau Université de Neuchâtel Guillaume BossardAlbert-Einstein-Institut, Golm Leonardo BriziÉcole Polytechnique Fédérale de Lausanne (EPFL) Johannes BroedelLeibniz Universität Hannover (AEI) Tom BrownQueen Mary, University of London Ilka BrunnerEidgenössische Technische Hochschule (ETH), Zürich Erling BrynjolfssonUniversity of Iceland Dmitri BykovSteklov Institute, Moscow and Trinity College, Dublin Joan CampsUniversitat de Barcelona

  11. [Quality of advanced practice nurse counseling in home care settings (APN-BQ): psychometric testing of the instrument].

    PubMed

    Petry, Heidi; Suter-Riederer, Susanne; Kerker-Specker, Carmen; Imhof, Lorenz

    2014-12-01

    Hintergrund: Patientenzentrierte und individuell ausgerichtete Angebote, wie die häusliche Beratung durch Pflegeexpertinnen-APN (Advanced Practice Nurses), eignen sich besonders, chronisch kranke alte Menschen in einer möglichst selbstständigen Lebensführung zu unterstützen. Methode: Um die Qualität einer patientenzentrierten Beratung zu evaluieren, wurde ein 23-Item Instrument entwickelt und seine psychometrischen Eigenschaften mit einer Stichprobe von 206 Personen, die 80 Jahre und älter waren getestet. Ziel: Ziel dieses Artikels ist es, die Entwicklung und Evaluation des APN-BQ zu beschreiben. Die psychometrische Testung des Instruments erfolgte anhand einer Hauptkomponentenanalyse mit Varimax-Rotation. Ergebnisse: Die Analyse ergab eine stabile vier Faktorenstruktur (FS = 0,91) mit 19 Items. Alle Faktoren hatten eine Faktorladung > 0,45. Die interne Konsistenz der Gesamtskala ergab einen Wert von Cronbachs alpha 0,86. Die hohe Rücklaufquote der Fragebogen und die Tatsache, dass 98,8 % der Fragen beantwortet wurden, bestätigten die Anwendungsfreundlichkeit und Akzeptanz des Instruments. Schlussfolgerungen: Das APN-BQ erwies sich als zuverlässiges und in Bezug auf Inhalt und Konstrukt valides Instrument, die Struktur-, Prozess- und Ergebnisqualität einer patientenzentrierten Beratungsintervention in der gemeindenahen Versorgung sowie das Ausmaß der Partizipation und Selbstbefähigung (Empowerment) der zu Beratenden zu messen.

  12. Is there a "net generation" in veterinary medicine? A comparative study on the use of the Internet and Web 2.0 by students and the veterinary profession.

    PubMed

    Tenhaven, Christoph; Tipold, Andrea; Fischer, Martin R; Ehlers, Jan P

    2013-01-01

    Einleitung: Informelles und formelles lebenslanges Lernen ist im Studium und Beruf essenziell. Dazu können neben der klassischen Fortbildung auch Web 2.0 Tools benutzt werden. Umstritten in der Literatur ist allerdings, ob es unter den „Unter 30 Jährigen“ eine sogenannte Net-Generation gibt. Ziel: Überprüfung der Hypothese, dass eine Net-Generation unter Studierenden und jungen Tierärzten existiert. Methode: Eine Onlineumfrage unter Studierenden und der Tierärzteschaft wurde im deutschsprachigen Raum durchgeführt, die per Onlinemedien und klassischen Printmedien beworben wurde.Ergebnisse: An der Befragung haben 1780 Personen teilgenommen. Es gibt unterschiedliches Nutzungsverhalten von Studierenden und der Tierärzteschaft bei sozialen Netzwerken (91,9% vs. 69%) und IMs (55,9% vs. 24,5%). Alle Tools wurden hauptsächlich passiv und privat genutzt, im geringeren Maße auch für den Beruf und das Studium.Ausblick: Der Einsatz von Web 2.0 Tools ist sinnvoll, jedoch ist eine Vermittlung von Informations- und Medienkompetenz, Erstellung von Verhaltensregeln im Internet und Überprüfung von „user generated content“ essentiell.

  13. Theory in practice instead of theory versus practice--curricular design for task-based learning within a competency oriented curriculum.

    PubMed

    Rotthoff, Thomas; Schneider, Matthias; Ritz-Timme, Stefanie; Windolf, Joachim

    2015-01-01

    Zielsetzung: Medizinstudierende sollen bereits während ihres Studiums ärztliches Denken und Handeln intensiv trainieren und ihre klinische Expertise in theoretischer und praktischer Hinsicht entwickeln. Methodik: Ausgehend von den Erkenntnissen der Lehr- und Lernforschung wurde ein Curriculum für die klinisch-praktische Ausbildung im Modellstudiengang Düsseldorf entwickelt, welches auf das arbeitsplatzbezogene Lehren, Lernen und Prüfen fokussiert. Ergebnisse: Das Curriculum basiert für Studierende im 3, 4 und 5. Studienjahr wesentlich auf dem Lernen an Behandlungsanlässen von Patienten in multidisziplinären Bereichen der ambulanten und stationären Versorgung. Für dieses Lehrformat wurden 123 Behandlungsanlässe definiert und deren Verknüpfbarkeit mit Krankheitsbildern aus den verschiedenen Fachdisziplinen geprüft. Ausgehend vom Behandlungsanlass eines konkreten Falles, erarbeiten sich die Studierenden das zugrundeliegende Krankheitsbild sowie das differentialdiagnostische und therapeutische Vorgehen und vertiefen dabei das notwendige Wissen in den Grundlagenfächern. Zur Lernunterstützung wurden Studienbücher von den Kliniken erstellt. Das Lernen ist eingebunden in kompetenzorientiertes und arbeitsplatzbezogenes Lernen und Prüfen mit einer intensiven Kontaktzeit zwischen Studierenden und Ärzten.Schlussfolgerung: Das Konzept ermöglicht die Integration von Theorie in die Praxis sowie die Integration von Wissen aus den Grundlagen-, klinisch-theoretischen und klinischen Fächern in das ärztliche Denken und Handeln.

  14. Do medical students like communication? Validation of the German CSAS (Communication Skills Attitude Scale).

    PubMed

    Busch, Anne-Kathrin; Rockenbauch, Katrin; Schmutzer, Gabriele; Brähler, Elmar

    2015-01-01

    Zielsetzung: Die Lehre ärztlicher Gesprächskompetenz schließt die Vermittlung förderlicher Einstellungen ein. Mittels der Communication Skills Attitude Scale (CSAS) werden Einstellungen Medizinstudierender zum Erwerb von kommunikativer Kompetenz erfasst. Ziel der vorliegenden Erhebung ist die Entwicklung einer deutschsprachigen CSAS-Fassung (CSAS-G), um die Einstellungen in einer deutschsprachigen Kohorte zu messen. Ergänzend untersuchten wir den Einfluss demographischer Merkmale auf die Einstellungswerte.Methodik: Wir erstellten die CSAS-G und befragten in unserer Untersuchung 529 Studienteilnehmer aus drei verschiedenen Studienjahren. Wir führten eine explorative wie konfirmatorische Faktorenanalyse durch und verglichen anschließend die Einstellungswerte nach Studienjahr. Ebenso wurde eine multiple Regressionsanalyse berechnet.Ergebnisse: Die konfirmatorische Faktorenanalyse bestätigte das zweifaktorielle System aus der explorativen Faktorenanalyse. Die Studierenden gaben wenig Zustimmung zu negativen Einstellungen und mäßige Zustimmung zu positiven Einstellungen an. Die Einstellungswerte differieren signifikant nach Geschlechtszugehörigkeit.Schlussfolgerung: Die CSAS-G eignet sich zur Einschätzung von Einstellungsausprägungen zu Kommunikationskompetenz in deutschsprachigen Kohorten. Die Medizinstudierenden unserer Studie zeigten grundlegend eine positive Einstellung. Weiterführende Untersuchungen sind erforderlich, um die Einstellungen deutschsprachiger Medizinstudierender zu kommunikativer Kompetenz zu erfassen und zu verstehen.

  15. Einleitung

    NASA Astrophysics Data System (ADS)

    Feldmann, Klaus; Reinhardt, Andreas; Pfeffer, Michael

    In nahezu allen elektronischen Geräten dienen leistungselektronische Systeme zur Umformung und Steuerung der notwendigen Spannungen bzw. Ströme. Aufgrund ihrer komplexen Baustrukturen und der häufig geringen Losgrößen werden diese Systeme jedoch hauptsächlich in zeitintensiver Handarbeit gefertigt. Viele Firmen, die sich mit der Montage solcher Systeme auseinandersetzen, entscheiden sich deswegen zu einer Verlagerung der Wertschöpfungsschritte in sogenannte Niedriglohnländer. Im Projekt Wettbewerbsfähige Produktionskonzepte und Montageverfahren für leistungselektronische Systeme in globalen Märkten" (ProMoLeS), das unter dem Themenfeld Kompetenz Montage: Global agieren, am Standort Deutschland montieren" durchgeführt wurde, sind die Ergebnisse entstanden und Lösungen entwickelt worden, welche in den nachfolgenden Kapiteln ein breites Spektrum rund um die Montage leistungselektronischer Systeme abdecken. Das Themenfeld Kompetenz Montage" wurde mit Mitteln des Bundesministeriums für Bildung und Forschung (BMBF) innerhalb des Rahmenkonzeptes Forschung für die Produktion von morgen" gefördert und vom Projektträger Forschungszentrum Karlsruhe (PTKA) betreut.

  16. Berlin in Motion: Interprofessional teaching and learning for students in the fields of medicine, occupational therapy, physiotherapy and nursing (INTER-M-E-P-P).

    PubMed

    Bohrer, Annerose; Heinze, Cornelia; Höppner, Heidi; Behrend, Ronja; Czakert, Judith; Hitzblech, Tanja; Kaufmann, Ina; Maaz, Asja; Räbiger, Jutta; Peters, Harm

    2016-01-01

    Zielsetzung: Das Berliner Projekt „Interprofessionelles Lehren und Lernen in Medizin, Ergotherapie, Physiotherapie und Pflege“ (INTER-M-E-P-P) verfolgt das Ziel, interprofessionelle Lehrveranstaltungen modellhaft zu entwickeln, zu erproben und in die Curricula der Studiengänge zu implementieren. Methodik: Unter der Leitung einer institutions-, professions- und statusübergreifenden Lenkungsgruppe werden interprofessionelle Lehrveranstaltungen konzipiert, durchgeführt und evaluiert. Spezifisch sind die studentische Partizipation in der Lenkungsgruppe und die Begleitung durch externe Supervision. Die Evaluation integriert die Perspektiven aller am Projekt Beteiligten und kombiniert qualitative und quantitative Methoden. Ergebnisse: INTER-M-E-P-P hat Strukturen zur Kooperation der beteiligten Hochschulen und Studiengänge aufgebaut. Drei Lehrveranstaltungen wurden interprofessionell konzipiert, durchgeführt und evaluiert. Die unterschiedliche curriculare, strukturelle und räumliche Verortung der Studiengänge führt zu einem hohen, ressourcenintensiven Planungs- und Umsetzungsaufwand. Stereotype und Rollenbilder der Planenden können den Prozess erschweren; unter externer Supervision jedoch die professionsspezifischen Blickwinkel erweitern und bereichern.Schlussfolgerung: Eine nachhaltige Implementierung von IPL in die Curricula der Gesundheitsstudiengänge ist derzeit durch Barrieren wie die räumliche Trennung und verschiedene Studien- und Prüfungsordnungen erschwert. Sie benötigt dauerhafte Unterstützungsstrukturen auf hochschulischer und politischer Ebene.

  17. [Beweggründe von Krebspatienten für und gegen die Inanspruchnahme der Misteltherapie].

    PubMed

    Gschwendtner, Kathrin M; Holmberg, Christine; Weis, Joachim

    2016-01-01

    Einleitung: Die Misteltherapie ist im deutschsprachigen Raum ein häufig angewandtes komplementärmedizinisches Verfahren (KM) in der Onkologie. Diese Studie hatte das Ziel, die Beweggründe für oder gegen eine Inanspruchnahme der Misteltherapie zu untersuchen und Themenfeldern zuzuordnen. Patienten und Methoden: Es wurden qualitative leitfadengestützte Interviews mit Krebspatienten geführt. Der Interviewleitfaden fragte nach der Inanspruchnahme von KM, der Motivation zur Inanspruchnahme, Informationsverhalten und -bedürfnissen zu KM sowie nach der Krebserkrankung. Um die Beweggründe für die Inanspruchnahme oder Nichtinanspruchnahme der Misteltherapie zu verstehen, wurden die Interviews inhaltsanalytisch ausgewertet. Ergebnisse: Insgesamt wurden Interviews mit 88 Krebspatienten geführt, davon nutzen 18 (20,5%) die Misteltherapie. Die Beweggründe für oder gegen eine Inanspruchnahme der Misteltherapie ließen sich den 2 Themenfeldern «Wahrgenommene Indikation» und «Abwägungen bei der Entscheidungsfindung» zuordnen. Diskussion und Schlussfolgerungen: Mit der Misteltherapie wird sowohl ein Einfluss auf das Tumorwachstum als auch eine supportive Wirkung assoziiert. Anwender sehen die Misteltherapie als sicheres Verfahren; Nichtnutzer befürchten eher Neben- oder Wechselwirkungen. Die Empfehlung von Fachpersonal spielt eine wichtige Rolle bei der Inanspruchnahme. Zum Teil waren die Nichtnutzer interessiert an der Anwendung der Misteltherapie, befanden sich jedoch noch im Klärungsprozess. © 2016 S. Karger GmbH, Freiburg.

  18. Terminology for interprofessional collaboration: definition and current practice.

    PubMed

    Mahler, Cornelia; Gutmann, Thomas; Karstens, Sven; Joos, Stefanie

    2014-01-01

    Hintergrund: Interprofessionelle Zusammenarbeit führt zu einer verbesserten Gesundheitsversorgung. Die Forderung nach interprofessioneller Zusammenarbeit geht einher mit nationalen und internationalen Empfehlungen für interprofessionelles Lernen und Ausbildungssequenzen. Die GMA nimmt sich dieser nationalen und internationalen Herausforderungen an und hat den Ausschuss „Interprofessionelle Ausbildung in den Gesundheitsberufen“ ins Leben gerufen, um dieser neuen Entwicklung Nachdruck zu verleihen und konkrete Empfehlungen zu entwickeln. Die Verwendung von Begrifflichkeiten zur Zusammenarbeit der Gesundheitsberufe scheint dabei vielgestaltig und wenig abgestimmt zu sein. Ziel des Beitrags ist die Klärung unterschiedlich verwendeter Begriffe im Bereich der Zusammenarbeit der Gesundheitsberufe und die Analyse der verwendeten Begriffe in deutschen Fachzeitschriften. Methodik: Häufig verwendete Begriffe zur Zusammenarbeit der Gesundheitsberufe wurden identifiziert und anschließend eine nicht systematische Analyse deutschsprachiger medizinischen Fachzeitschriften, zur Verwendung der Begrifflichkeiten „interprof*“ und „interdiszip*“ durchgeführt.Ergebnisse: Die Begriffe „interprofessionell“ und „interdisziplinär“ wurden in den begutachteten Fachzeitschriften uneinheitlich und zum Teil synonym verwendet. Schlussfolgerung: Derzeit werden Begrifflichkeiten zur Zusammenarbeit der Gesundheitsberufe wenig abgestimmt genutzt und zum Teil beliebig verwendet. Die Begriffe „professionell“ und „disziplinär“ werden aus Sicht der Medizin und der Sozialwissenschaften unterschiedlich verwendet. Als Basis für eine erfolgreiche Weiterentwicklung der Zusammenarbeit innerhalb der Gesundheitsberufe und für ein besseres Verständnis füreinander sollte die Terminologie einheitlich verwendet werden.

  19. [The treatment needs of migrant children according to child and adolescent psychiatrists from medical clinics and in private practice].

    PubMed

    Siefen, Georg; Kirkcaldy, Bruce; Adam, Hubertus; Schepker, Renate

    2015-03-01

    Fragestellung: Wie reagiert das kinder- und jugendpsychiatrische Versorgungssystem in Deutschland auf die steigende Zahl von Kindern und Jugendlichen mit Migrationshintergrund? Methodik: Mit einem weiterentwickelten Fragebogen für psychiatrische Kliniken wurden leitende Ärzte kinder- und jugendpsychiatrischer Kliniken über die Bundesarbeitsgemeinschaft der Leitenden Klinikärzte für Kinder- und Jugendpsychiatrie, Psychosomatik und Psychotherapie (BAG) nach Bedingungen und Entwicklungsmöglichkeiten der Versorgung von Migrantenkindern und -jugendlichen befragt. Außerdem erhielt eine «random representative» Stichprobe niedergelassener Kinder- und Jugendpsychiater über den Berufsverband für Kinder- und Jugendpsychiatrie, Psychosomatik und Psychotherapie in Deutschland e. V. (BKJPP) einen adaptierten Bogen. Ergebnisse: Mit 100 Kinder- und Jugendpsychiatern in eigener Praxis wurden nur etwa 1/8 der Niedergelassenen aber mit 55 Leitenden Ärzten 1/3 und damit eine repräsentative Stichprobe der Chefärzte kinder- und jugendpsychiatrischer Kliniken und Tageskliniken befragt. Jede dritte Klinik hat migrantenspezifische Angebote. In Klinik und Praxis werden zu selten kompetente Dolmetscher eingesetzt. Behandlungsprobleme bei Migrantenkindern und -jugendlichen ergeben sich aus dem Krankheitsverständnis der Eltern, des Patienten und sprachlichen Verständigungsproblemen. Kulturelle Vielfalt wird als bereichernd wahrgenommen. Migrationshintergrund und Gender der Kinder- und Jugendpsychiater beeinflussen die Migrantenbehandlung. Schlussfolgerungen: Durch konkrete Schritte wie die Finanzierung von Dolmetscherkosten müssen der Prozess der «kulturellen Öffnung» unterstützt und die Versorgung von Migrantenkindern und -jugendlichen weiter verbessert werden.

  20. Comprehension through cooperation: Medical students and physiotherapy apprentices learn in teams - Introducing interprofessional learning at the University Medical Centre Mannheim, Germany.

    PubMed

    Mette, Mira; Dölken, Mechthild; Hinrichs, Jutta; Narciß, Elisabeth; Schüttpelz-Brauns, Katrin; Weihrauch, Ute; Fritz, Harald M

    2016-01-01

    Zielsetzung: Um zukünftige Fachkräfte in der Patientenversorgung besser auf die interprofessionelle Zusammenarbeit vorzubereiten, wurden an der Universitätsmedizin Mannheim interprofessionelle Lerneinheiten für Medizinstudierende und Physiotherapieschüler entwickelt. Die Erfahrungen aus der Konzeption, Implementierung und Evaluation dieser Lerneinheiten werden dargestellt und diskutiert.Methoden: An 5 interprofessionellen Lerneinheiten nahmen 265 Medizinstudierende und 43 Physiotherapieschüler teil. Von diesen beantworteten 87-100% im Rahmen der Lehrveranstaltungsevaluation geschlossene und offene Fragen eines selbstentwickelten Fragebogens (24 Items). Die Antworten zu selbstberichtetem Lernzuwachs, Nutzen, Motivation und Zufriedenheit mit der Lerneinheit wurden nach Profession getrennt ausgewertet.Ergebnisse: Die Lerneinheiten wurden von beiden Teilnehmergruppen gut angenommen. Mehr als 75% aller Teilnehmer waren der Meinung, dass sie sich die neuen Lerninhalte nicht anderweitig besser hätten aneignen können. Signifikante Unterschiede zwischen Medizinstudierenden und Physiotherapieschülern gab es vorrangig beim empfundenen Lernzuwachs, den die Physiotherapieschüler als geringer angaben.In den offenen Fragen wurden am häufigsten interprofessionelle Aspekte positiv hervorgehoben. Kritisiert wurden am häufigsten organisatorische Punkte und der als gering empfundene Lernzuwachs.Schlussfolgerung: Die Einführung von interprofessionellem Lernen ist durch organisatorische Herausforderungen sehr aufwändig. Es ist aber lohnenswert, da die interprofessionellen Aspekte der Lerneinheiten von den Teilnehmern als wertvoll angesehen wurden. Anzustreben ist deshalb eine curriculare Verstetigung und Erweiterung interprofessionellen Lernens zu einem longitudinalen Strang.

  1. Validation of the Walking Impairment Questionnaire for Spanish patients.

    PubMed

    Lozano, Francisco S; March, José R; González-Porras, José R; Carrasco, Eduardo; Lobos, José M; Areitio-Aurtena, Alix

    2013-09-01

    Hintergrund: Der Walking Impairment Questionaire (WIQ) ist ein kurzer, einfach auszufüllender, krankheitsspezifischer Fragebogen zur Beurteilung des intermittierenden Hinkens. Eine spanische Version des WIQ wurde kürzlich in Texas für spanisch sprechende Amerikaner validiert, aber es sollte auch eine Validierung für spanisch sprechende Europäer geben. Patienten und Methoden: Nach der kulturellen Anpassung des WIQ füllten 920 Patienten mit Claudicatio intermittens(ankle brachial index < 0.9) zwei Fragenbögen aus (spanische Version des WIQ und European Quality of Life 5 Dimenions [EQ-5D]). Die Validierung wurde bestimmt durch den Vergleich des WIQ mit dem EQ-5D. Die Reliabilität und interne Übereinstimmung wurden mit dem Intra-class Korrelationskoeffizienten (ICC) und Cronbach‘s alpha gemessen. Ergebnisse: Die drei Domänen des WIQ korrelierten sehr stark mit dem EQ-5D Gesundheitsergebnis (p < 0.001). Test-Retest-Reliabilität (ICC = 096) und interne Konsistenz (Cronbach‘s alpha = 0.92) waren hervorragend. Schlussfolgerungen: Die spanische Version des WIQ für spanisch sprechende Europäer war valide und reproduzierbar. Sie kann für spanisch sprechende Europäer mit Claudicatio intermittens benutzt werden.

  2. On the history of plasma treatment and comparison of microbiostatic efficacy of a historical high-frequency plasma device with two modern devices.

    PubMed

    Napp, Judith; Daeschlein, Georg; Napp, Matthias; von Podewils, Sebastian; Gümbel, Denis; Spitzmueller, Romy; Fornaciari, Paolo; Hinz, Peter; Jünger, Michael

    2015-01-01

    Hintergrund: Kaltes Atmosphärendruckplasma (CAP) hat durch seine mannigfaltigen bioaktiven Eigenschaften ein neues medizinisches Feld definiert: die Plasmamedizin. Allerdings wurde vor etwa 100 Jahren CAP in verwandter Form in der Hochfrequenztherapie genutzt. Zielsetzung dieser Studie war eine Übersicht über die historischen Plasmabehandlungen zu gewinnen und Daten bezüglich der antimikrobiellen Wirkung eines historischen Hochfrequenzapparats zu gewinnen.Methode: Erstens wurde historische Literatur bezüglich CAP-Behandlungen ausgewertet, da aus dem heutigen Schrifttum keine Angaben gewonnen werden konnten. Zweitens wurde die Empfindlichkeit von fünf verschiedenen bakteriellen Wundisolaten auf Agar gegenüber einer historischen Plasmaquelle (violet wand [VW]) und zwei modernen Geräten (atmospheric pressure plasma jet [APPJ] und Dielectric Barrier Discharge [DBD]) ermittelt. Die erzielten Hemmhöfe wurde verglichen. Ergebnisse: Die seinerzeit populärsten elektromedizinischen Anwendungen erzeugten durch Glaselektroden sogenannte Effluvien, die mit modernem CAP verwandt sind. Alle drei untersuchten Plasmaquellen zeigten eine vollständige Eradikation aller behandelter Isolate im plasmabehandelten Bereich. Die historische Plasmaquelle (VW) war dabei ähnlich wirksam wie die modernen Plasmaquellen. Schlussfolgerung: In begrenztem Umfang kann retrograd ein Wirksamkeitsnachweis der historischen Plasmabehandlungen abgeleitet werden, insbesondere bei der Behandlung infektiöser Erkrankungen. Die zugrunde liegende Technologie könnte für die Entwicklung moderner Nachfolgegeräte genutzt werden.

  3. [Association of peer victimization, coping, and pathological internet use among adolescents].

    PubMed

    Strittmatter, Esther; Brunner, Romuald; Fischer, Gloria; Parzer, Peter; Resch, Franz; Kaess, Michael

    2014-03-01

    Fragestellung: In der vorliegenden Studie wurde untersucht, ob ein Zusammenhang zwischen pathologischem Internetgebrauch, Mobbing und Copingstilen bei Jugendlichen mit Mobbingerfahrungen besteht. Methodik: Im Rahmen einer europäischen schulbasierten Studie (SEYLE) wurde eine repräsentative Querschnittsuntersuchung an 1357 Schülern aus Heidelberg und Umgebung durchgeführt (710 weibliche/647 männlich Jugendliche; mittleres Alter 14.7; SD 0.8). Pathologischer Internetgebrauch wurde mit dem Young Diagnostic Questionnaire erhoben. Mobbing wurde in verbales, körperliches Mobbing und Mobbing in der Beziehung unterteilt. Hinsichtlich der Copingstile wurden aktives Coping, Vermeidung, Hilfe suchen und sonstige Strategien unterschieden. Als Kovariate wurde die psychische Symptombelastung mittels Strengths and Difficulties Questionnaire erfasst. Ergebnisse: 4.8 % der Schüler wiesen einen pathologischen Internetgebrauch auf, 14.4 % zeigten einen problematischen Internetgebrauch. Insgesamt berichteten 52.3 % der Jugendlichen über Erfahrungen mit Mobbing (38.7 % verbales Mobbing, 19.8 % körperliches Mobbing, 34.1 % Mobbing in der Beziehung). Es bestand ein signifikanter Zusammenhang von Mobbingerfahrungen und pathologischem Internetgebrauch, der zum Teil durch die psychische Symptombelastung erklärt werden konnte. Hinsichtlich der Copingstile bei stattgefundenem Mobbing bestand kein signifikanter Unterschied zwischen Schülern mit normalem, problematischem und pathologischem Internetgebrauch. Schlussfolgerungen: Aufgrund des Zusammenhanges zwischen Mobbing, psychischer Symptombelastung und pathologischem Internetgebrauch sind in der Zukunft schulbasierte sowie familienbezogene Präventionsmaßnahmen und evaluierte Therapieprogramme erforderlich.

  4. [Agreement between self-report and clinician's assessment in depressed adolescents, using the example of BDI-II and CDRS-R].

    PubMed

    Straub, Joana; Plener, Paul L; Koelch, Michael; Keller, Ferdinand

    2014-07-01

    Fragestellung: Vorhergehende Studien zeigen eine hohe Übereinstimmung von Selbst- und Klinikerurteil bei der Erfassung von Depressivität. Die Übereinstimmung auf Summen-, Subskalen- und Einzelitemebene wurde aber bisher nicht bei einer psychiatrischen jugendlichen Stichprobe untersucht. Der Einfluss von Drittvariablen, wie Alter, Geschlecht, IQ und Behandlungssetting wurde bei Jugendlichen bisher unzureichend überprüft. Methodik: Untersucht wurden 105 depressive Jugendliche (mittleres Alter = 15.94) bei welchen innerhalb einer Woche das BDI-II und CDRS-R durchgeführt wurde. Korrelationsanalysen erfolgten auf Ebene der Summenwerte, Subskalen und Einzelitems. Ergebnisse: Es zeigte sich eine hohe Korrelation zwischen Selbst- und Klinikerurteil (r = .67). Auf Subskalen-Ebene zeigten Items, die somatische Inhalte erfassen, keine höhere Konkordanz als Subskalen, die kognitive oder affektive Inhalte messen. Auf Symptom-Ebene zeigte sich die höchste Übereinstimmung bei dem Item Selbstmordgedanken. Drittvariablen hatten keinen signifikanten Einfluss auf die Höhe der Korrelation aber Jugendliche mit einem eher hohen IQ und ambulant Behandelte neigten zur relativen Überschätzung ihrer Symptomatik. Schlussfolgerungen: Die Gesamtkorrelation war hoch und unterschied sich nicht von Ergebnissen vergleichbarer Korrelationsstudien. Die höchste Übereinstimmung bei dem Item «Selbstmordgedanken» spricht für die gute Erfassbarkeit von Suizidalität auch im Klinikerurteil. Der Fragebogen kann somit deutliche Hinweise auf das Vorliegen einer Depression liefern, jedoch sollte trotz hoher Korrelationen nicht ein Verfahren durch ein anderes ersetzt werden.

  5. Psychosocial aspects of donation and the dissection course: An extra-curricular program with the objective of assisting students confront issues surrounding gross anatomy lab.

    PubMed

    Weyers, Simone; Noack, Thorsten; Rehkämper, Gerd

    2014-01-01

    Hintergrund und Ziel: Der "Präparierkurs" ist ein essentieller Teil der vorklinischen medizinischen Ausbildung. An der Medizinischen Fakultät Düsseldorf wurde eine kursbegleitende Veranstaltung entwickelt mit dem Ziel, die Erfahrungen der Studierenden gemeinsam mit diesen zu reflektieren und sie in ihrer Auseinandersetzung mit dem Körperspender und der Präparation zu unterstützen. Ziel des Manuskriptes ist die Darstellung des Unterrichtskonzeptes.Methode: Es wurde besonderer Wert auf den Austausch in der Peer-Gruppe gelegt. Die Reflexion erfolgte im Rahmen einer Vorlesung, einem Kleingruppenseminar und einem online Tagebuch als Kernstück. Abschließend erfolgte eine Evaluation der Veranstaltung. Ergebnisse: Ca. ein Sechstel der Studierenden nutzte das online Tagebuch. Ausgewählte Tagebucheinträge werden hier dargestellt. Ebenfalls ein Sechstel der Studierenden nahm an der Evaluation teil. Diese Studierenden empfanden das Angebot als sehr hilfreich, um sich auf den Präparierkurs vorzubereiten.Diskussion: Ein solches Unterrichtsangebot könnte den Anfang eines longitudinalen Unterrichtsangebotes bilden, um den adäquaten Umgang mit dem Thema Sterben und Tod zu fördern.

  6. Homeopathy as elective in undergraduate medical education--an opportunity for teaching professional core skills.

    PubMed

    Lehmann, Bianca; Krémer, Brigitte; Werwick, Katrin; Herrmann, Markus

    2014-01-01

    Zielsetzung: In der Evaluation des seit sechs Jahren regelmäßig stattfindenden klinischen Wahlfachs Homöopathie am Institut für Allgemeinmedizin der Universität Magdeburg wurden sowohl die studentische Einschätzung des Seminarkonzepts und der -durchführung als auch die Bedeutung für die professionelle Sozialisation der Studierenden erfragt.Methodik: Im Rahmen des seit dem Wintersemester 2008/2009 jährlich stattfindenden Wahlfachs wurden für drei Veranstaltungen leitfadengestützte Gruppendiskussionen mit insgesamt 30 Teilnehmern des Wahlfachs durchgeführt. Die Auswertung dieser erfolgte in Anlehnung an die qualitative Inhaltsanalyse nach Mayring.Ergebnisse: Seminarkonzept und -durchführung haben sich bewährt. Die Lern- und Erlebenserfahrungen durch das Wahlfach, v.a. hinsichtlich eines holistischen, individualisierten Blicks auf die Person des Patienten sowie der Bedeutung einer partnerschaftlichen Arzt-Patient-Beziehung, werden von den Studierenden – unabhängig von ihrer persönlichen Einstellung zur Homöopathie – als positiv gewertet. Diese Einschätzung erfolgt gerade auch mit Blick auf ihre bisherige konventionell medizinisch geprägte Ausbildung.Schlussfolgerung: Das Wahlfach vermittelt den Studierenden neben dem spezifischen Fachwissen für eine integrative Medizin auch wichtige ärztliche Basiskompetenzen, welche unabhängig von einer komplementärmedizinischen Ausrichtung von Bedeutung sind.

  7. Fibrin glue as a protective tool for microanastomoses in limb reconstructive surgery.

    PubMed

    Langer, Stefan; Schildhauer, Thomas A; Dudda, Marcel; Sauber, Jeannine; Spindler, Nick

    2015-01-01

    Einleitung: Fibrinkleber ist ein immer häufiger in der klinischen Routine eingesetztes Tool zur Stabilisierung von Mikroanastomosen und Nervenreparatur.Dieser Artikel fasst die technischen Eigenschaften und Vorteile im Gebrauch sowie die variable Anwendungsmöglichkeit von Fibrinkleber im mikrochirurgischen Kontext zusammen und illustriert dies an einem extremitätenrekonstruierenden Fallbeispiel.Patienten und Methoden: 131 Patienten, an welchen sowohl elektiv als auch in einer Notfallsituation eine mikrochirurgische Intervention durchgeführt wurde, hauptsächlich in der Extremitäten erhaltenden Chirurgie, wurden retrospektiv untersucht; ebenso die Patienten, welche eine freie Lappenplastik erhalten hatten.Ergebnisse: Die Verwendung von Fibrinkleber in der Mikrochirurgie erlaubt ein exaktes Positionieren der Anastomose von Gefäßen und Nerven. Ein Verdrehen oder Kinking des Pedickels konnte in keinem Fall festgestellt werden. Die Überlebensrate der Lappen betrug >94%. In 99% der Fälle konnte der Fibrinkleber belassen werden. In dem seltenen Fall der Revision konnte der Fibrinkleber leicht entfernt werden ohne Schaden an der Anastomose zu hinterlassen. Zusammenfassung: Fibrinkleber ist nicht geeignet Anastomoseninsuffizienzen oder leckende Anastomosen zu behandeln, allerdings schützt er die Anastomose vor schadendem Druck ausgelöst durch Gewebe oder Flüssigkeit. Er bewahrt den Gefäßstiel vor Verdrehung und hilft dem Operateur beim Wiederauffinden der Anastomose im Fall einer Revision.

  8. [Experiences of Austrian nursing staff in dealing with advance directives].

    PubMed

    Heindl, Patrik; Ruppert, Sabine; Kozon, Vlastimil

    2014-10-01

    Hintergrund: Die Patientenverfügung ist aufgrund der Betonung der Autonomie der PatientInnen und des zunehmenden medizinischen Fortschritts ein aktuelles Thema. Dabei zeigen sich Probleme sowohl in der Verfassung als auch bei der Umsetzung von Patientenverfügungen in den Institutionen. Die Aufgaben und der Einfluss der Pflege in diesem Zusammenhang sind noch kaum Gegenstand der wissenschaftlichen Untersuchungen. Dies ist der erste Artikel, der sich mit dieser Thematik auseinandersetzt. Ziel: Ziel der Untersuchung ist die Darstellung der Erfahrungen von österreichischen Pflegepersonen im Umgang mit Patientenverfügungen im Universitätskrankenhaus. Methode: Es wurde ein deskriptiv-exploratives Querschnittdesign angewendet. Die Datenerfassung erfolgte mittels Fragebögen im Jahr 2009. Insgesamt wurden 266 Pflegepersonen in einem österreichischen Universitätskrankenhaus befragt. Ergebnisse: Bei den Pflegepersonen zeigte sich eine große Unsicherheit bei gleichzeitigem Vorhandensein von ausreichendem theoretischen Fachwissen und fehlenden Strukturen von Seiten der Organisation. Dadurch entstanden einige interdisziplinäre Konflikte im Zusammenhang mit der Umsetzung der Patientenverfügung. Schlussfolgerungen: Um Konflikte zu vermeiden und den Umgang sowie die Umsetzung von Patientenverfügungen in der Praxis zu verbessern, ist die Etablierung einer klinischen Ethikberatung empfehlenswert. Aufgaben einer solchen Ethikberatung sind die Erstellung von Richtlinien in der Institution, die Durchführung von individuellen Fallbesprechungen und die Fort- und Weiterbildung der betroffenen Gesundheitsberufe.

  9. Berechnung von Nichtlinearitätsparametern von RF MOS Mischern mittels Volterra-Reihen

    NASA Astrophysics Data System (ADS)

    Susic, A.; Darrat, A. H.; Mathis, W.

    2011-07-01

    Die Nichtlinearität einer Mischerschaltung bezüglich des Informationssignals führt zu unerwünschten Spektralanteilen am Ausgang des Mischers. Da nicht alle Spektralanteile kritisch sind, müssen bei einer Nichtlinearitätsanalyse nur bestimmte Spektralanteile ermittelt werden. In dieser Arbeit wird ein Verfahren zur Bestimmung der Spektralanteile der Zustandsgrößen im Mischer mit Hilfe der Volterra-Reihe gezeigt. Das Verfahren basiert auf die Methode der nichtlinearen Stromquellen. Es wird sowohl auf nicht-schaltende als auch schaltende Mischer angewendet. Hierbei wird der erste als ein zeitinvariantes System mit zwei Eingängen und der zweite als ein periodisch zeitvariantes System mit einem Eingang modelliert. Das Verfahren wird in dem Computeralgebraprogramm MAPLE für den einfach balancierten MOS Mischer implementiert. Es ermöglicht die Herleitung von semi-symbolischen Ausdrücken für die Spektralanteile in Abhängigkeit von den Entwurfsparametern. Die numerischen Ergebnisse des Verfahrens werden gegenüber Simulationen mit SpectreRF verglichen.

  10. Untersuchung der Richtwirkung der Einkopplung von ebenen Wellen in eine Leitung

    NASA Astrophysics Data System (ADS)

    Magdowski, M.; Vick, R.

    2013-07-01

    Elektrische Leitungen und Kabel stellen häufig die Haupteinfallstore für elektromagnetische Felder in die daran angeschlossenen Geräte und Systeme dar. Für die Einkopplung einer ebenen Welle kann der in eine Leitung eingekoppelte Strom unter bestimmten Voraussetzungen mit Hilfe der Leitungstheorie sehr effizient bestimmt werden. Er hängt dabei von den Abmessungen der Leitung, den Leitungsabschlüssen sowie der Amplitude, der Wellenlänge und der Einfallsrichtung der ebenen Welle ab. In dieser Arbeit wird die Abhängigkeit der Einkopplung von der Einfallsrichtung näher untersucht. Dazu werden Richtdiagramme der Einkopplung berechnet, dargestellt und hinsichtlich der mittleren und maximalen Einkopplung über alle Einfallsrichtungen und Polarisationen ausgewertet. Die Ergebnisse werden genutzt, um die maximale Direktivität der Einkopplung in eine Leitung zu bestimmen. Fasst man die Einkopplung externer Felder in eine Leitung als einen Störfestigkeitstest auf, so kann die maximale Direktivität benutzt werden, um einen Vergleich zwischen unterschiedlichen Messumgebungen wie Absorberhallen und Modenverwirbelungskammern herzustellen.

  11. On the motion of a solid sphere through a viscous medium with a vertical temperature gradient

    NASA Astrophysics Data System (ADS)

    Wozniak, G.; Balasubramaniam, R.; Koukan, E.

    In this paper, we report experiments conducted on the temperature distribution around a solid sphere that settles slowly in a thermally stratified viscous fluid. The temperature field has been obtained using interferometry. In some cases thermochromic liquid crystal tracers have been used to simultaneously obtain the velocity and the temperature fields. We also describe a theoretical analysis of the problem and compare experimental and theoretical findings and discuss the results. we find that natural convection has a significant influence in determining the nature of the temperature field away from the sphere. Zusammenfassung In der vorliegenden Arbeit berichten wir über Experimente mit festen Kugeln, welche sich in einem thermisch geschichteten viskosen Fluid langsam nach unten bewegen. Das Temperaturfeld wurde mit Hilfe der Interferometrie bestimmt, in einigen Fällen auch mit thermochromen Flüssigkristall-Teilchen. Auch eine theoretische Analyse wird beschrieben. Experimentelle Resultate werden den theoretischen Daten gegenüber gestellt und die Ergebnisse diskutiert. Es zeigt sich, daß natürliche Konvektion einen erheblichen Einfluß bei der Bestimmung des Temperaturfeldcharakters außerhalb der Kugel hat.

  12. Bacterial etiology and antibiotic susceptibility pattern of diabetic foot infections in Tabriz, Iran.

    PubMed

    Akhi, Mohammad Taghi; Ghotaslou, Reza; Asgharzadeh, Mohammad; Varshochi, Mojtaba; Pirzadeh, Tahereh; Memar, Mohammad Yousef; Zahedi Bialvaei, Abed; Seifi Yarijan Sofla, Hasan; Alizadeh, Naser

    2015-01-01

    Zielsetzung: Es sollte die bakterielle Ätiologie (anaerobe und aerobe Flora) und Antibiotikaempfindlichkeit von Erregern beim diabetischen Fußsyndrom analysiert werden.Methode: Die Kultivierung erfolgte unter optimalen aeroben und anaeroben Bedingungen. Die Identifizierung der bakteriellen Isolate wurde mit mikrobiologischen Standardmethoden vorgenommen. Die Testung der Antibiotikaempfindlichkeit erfolgte gemäß den Richtlinien des Clinical und Laboratory Standards Instituts (CLSI).Ergebnisse: Von 60 Proben diabetischer Fußulcera wurden 92 Bakterienstämme isoliert. Dominierende Aerobier waren S. aureus (28%), gefolgt von Vertretern der Enterobacteriaceae (24%) einschließlich Escherichia coli (15%), Citrobacter spp. (4%), Enterobacter spp. (43%) und Coagulase-negativen Staphylococcus spp. (17%), Enterococcus spp. (15%), Pseudomonas aeroginosa (7%) und Acinetobacter spp. (4%). In den anaeroben Kulturen war in 4% der Ulcera Bacteroides fragilis nachweisbar, jedoch in keinem Fall Clostridium spp. Alle Gram-positiven Isolate waren gegen Linezolid empfindlich; alle Vertreter der Enterobacteriaceae waren gegenüber Imipenem empfindlich.Schlussfolgerung: Die meisten Infektionen bei den diabetischen Fußulcera waren durch eine Mischflora mit Dominanz von S. aureus und B. fragilis gekennzeichnet. Die Ulcera können daher in der Initialtherapie sinnvollerweise eine kombinierte antimikrobielle Therapie erfordern.

  13. Microbial contamination of mobile phones in a health care setting in Alexandria, Egypt.

    PubMed

    Selim, Heba Sayed; Abaza, Amani Farouk

    2015-01-01

    Zielsetzung: Es sollte die mikrobielle Kontamination von Mobiltelefonen in einer universitären Gesundheitseinrichtung untersucht werden.Methode: Abstrichproben wurden von 40 Mobiltelefonen von Patienten und Mitarbeitern im Universitätskrankenhaus in Alexandria entnommen. Die mikrobiologische Analyse wurde im mikrobiologischen Labor des Instituts für Public Health durchgeführt. Die Quantifizierung erfolgte sowohl durch direkte Ausbringung auf die Platte als auch durch Anlage von Subkulturen zur Differenzierung. Methicillin-resistente Staphylococcus aureus (MRSA) wurden mittels Plättchendiffusionsmethode nach Bauer und Kirby identifiziert. Isolierte Gram-negative Organismen wurden auf Vorkommen von ESBL-Bildung mittels der Doppeldiffusionsmethode gemäß Empfehlung des Clinical and Laboratory Standards Institute untersucht.Ergebnisse: Alle untersuchten Mobiltelefone waren entweder mit einer oder mehreren bakteriellen Arten kontaminiert. Am häufigsten wurden MRSA (53%) und Koagulase-negative Staphylokokken (50%) nachgewiesen. Als mittlere Anzahl von KbE ergaben sich 357 KbE mit einem Median von130 KbE/ml pro Mobiltelefon im Plattengussverfahren. Die korrespondierenden Werte betrugen 2.192 bzw. 1.720 KbE/Mobiltelefon im Direktausstrich.Schlussfolgerung: Mobiltelefone stellen ein Risiko in Gesundheitseinrichtungen zur Weiterverbreitung nosokomialer Pathogen einschließlich MRSA dar. Auf der Oberfläche von Mobiltelefonen kann die mikrobielle Kontamination methodisch einfach nachgewiesen werden.

  14. Impact of cold atmospheric pressure argon plasma on antibiotic sensitivity of methicillin-resistant Staphylococcus aureus strains in vitro.

    PubMed

    Lührmann, Anne; Matthes, Rutger; Kramer, Axel

    2016-01-01

    Zielsetzung: Die antimikrobielle Wirksamkeit von kaltem Atmosphärendruckplasma (CAP), auch als gewebeverträgliches Plasma (TTP) bezeichnet, könnte eine aussichtsreiche Option zur Eradikation von Methicillin-empfindlichen ebenso wie von Methicillin-resistenten Staphylococcus aureus-Stämmen sein, die oft chronische Wunden kolonisieren. Bisher wurde der Einfluss von CAP auf die Antibiotikaempfindlichkeit von S. aureus kaum untersucht. Da eine Veränderung der Antibiotikaempfindlichkeit für die Wundbehandlung relevant sein könnte, sollte der Einfluss von CAP auf die Empfindlichkeit verschiedener S. aureus-Stämme gegen unterschiedliche Antibiotika untersucht werden.Methode: Im Agardiffusionstest wurden Antibiotikatestplättchen mit Cefuroxim, Gentamicin, Oxacillin, Vancomycin, Ciprofloxacin, Co-Trimoxazol, Clindamycin und Erythromycin eingesetzt. Die Teststämme wurden auf Agar ausplattiert und mit CAP exponiert, bevor die Testplättchen aufgelegt wurden. Nach 24 h Bebrütung wurden die Inhibitionszonen gemessen und statistisch auf Unterschiede geprüft.Ergebnisse: In den meisten Fällen war die Einfluss von CAP auf die Antibiotikaempfindlichkeit zu vernachlässigen. Für zwei Stämme wurde die Empfindlichkeit gegenüber β-Lactam-Antibiotika signifikant herabgesetzt. Schlussfolgerung: Da CAP die Antibiotikaempfindlichkeit beeinflussen kann, sollten vor beabsichtigter kombinierter lokaler CAP-Behandlung und gleichzeitiger systemischer Antibiotikagabe Interaktionen in vitro untersucht werden, um unerwünschte Kombinationseffekte auszuschließen.

  15. Can the scoring of the walking estimated limitation calculated by history (WELCH) questionnaire be simultaneously simplified and improved?

    PubMed

    Bourdois, Clement; Laporte, Isabelle; Godet, Raphael; Laneelle, Damien; Vielle, Bruno; Abraham, Pierre

    2014-05-01

    Hintergrund: Der WELCH Fragebogen enthält 4 Elemente (A, B, C und D) und schätzt die maximale Gehzeit (MWT) auf dem Laufband bei Patienten mit Schaufensterkrankheit. Seine Punktzahl wurde empirisch definiert. Um heraus zu finden, ob die Wertung des WELCH verbessert oder vereinfacht werden könnte, haben wir verschiedene Methoden untersucht. Patienten und Methoden: Bei 423 Patienten haben wir 8 Methoden (H1 bis H8) getestet, mit Gewichtung von D oder Berechnung von α , β und γ in der Gleichung MWT = (αA + βB + γC) • D. Ergebnisse: Während der WELCH Pearson r 0.639 und die Fläche unter der ROC-Kurve für die Fähigkeit 5 Minuten auf dem Laufband zu gehen 0.795 für die empirische Methode war, reichten die Werte für die verschiedenen getesteten Methoden von 0.566 bis 0.611 für die Pearsons r Werte und 0,750 - 0,809 für die Flächen unter den Kurven. Schlussfolgerungen: Keine der getesteten Methoden verbesserte gleichzeitig die Korrelation zur MWT und blieb dabei einfach genug, um die Werte durch Kopfrechnen zu ermitteln. Das ursprüngliche empirische Scoring ist ein guter Kompromiss zwischen Genauigkeit und Einfachheit.

  16. Is German Medical Education Research on the rise? An analysis of publications from the years 2004 to 2013.

    PubMed

    Ackel-Eisnach, Kristina; Raes, Patricia; Hönikl, Lisa; Bauer, Daniel; Wagener, Stefan; Möltner, Andreas; Jünger, Jana; Fischer, Martin R

    2015-01-01

    Zielsetzung: Ausgangspunkt des vorliegenden Artikels ist die Feststellung, dass es aus Deutschland im Vergleich zu den angloamerikanischen Ländern oder den Niederlanden vor 2004 kaum internationale Publikationen im Bereich der medizinischen Ausbildungsforschung gab. In den letzten Jahren wurde jedoch eine steigende Bedeutung der medizinischen Ausbildungsforschung im deutschen Raum deutlich. Zielsetzung dieses Beitrags ist es zu prüfen, inwieweit sich in internationalen, englischsprachigen Fachzeitschriften im Themenfeld „Medizinische Ausbildungsforschung“ seit 2004 eine solche Entwicklung durch eine gesteigerte Publikationsaktivität belegen lässt. Methodik: Im Rahmen einer Literaturauswertung und Inhaltsanalyse wurden Artikel deutscher Autoren aus den Jahren 2004 bis 2013 in sechs internationalen englischsprachigen Fachzeitschriften der medizinischen Ausbildungsforschung analysiert. Um einen Überblick über die deutschen Forschungsaktivitäten in diesem Bereich zu bekommen, wurden alle Projekt- und Originalarbeiten deutscher Erst- und Letztautoren identifiziert und einer tiefergehenden inhaltlichen Analyse unterzogen. Ergebnisse: Insgesamt wurden 10.055 Artikel untersucht. Die Auswertung zeigt, dass zwischen 2004 und 2013 179 Artikel – hiervon 145 Projekt- und Originalarbeiten – deutscher Autoren in den betrachteten Zeitschriften publiziert wurden. Es zeigen sich Schwankungen im Zeitverlauf. Bei den Projekt- und Originalarbeiten handelt sich vor allem um Querschnitt- (27,8%) und randomisierte Kontrollstudien (25,6%) zum Thema „Lehr- und Lernmethoden“ (43,6%). Schlussfolgerung: Seit 2009 zeigt sich ein deutlicher Anstieg der Publikationszahlen deutscher Ausbildungsforscher in internationalen Fachzeitschriften im Vergleich zu den Jahren 2004-2008.

  17. Modellbasierte interindividuelle Registrierung an der lateralen Schädelbasis

    NASA Astrophysics Data System (ADS)

    Riechmann, M.; Lohnstein, P. U.; Raczkowsky, J.; Klenzner, T.; Schipper, J.; Wörn, H.

    Bei chirurgischen Eingriffen an der lateralen Schädelbasis wird in der zur Zeit gängigen Praxis das Knochengewebe unter optischer Kontrolle großflächig ablativ entfernt, um den Operationssitus freizulegen und konventionell operieren zu können. Prinzipiell soll dabei die Schonung vital und funktional bedeutender Strukturen berücksichtigt werden. Zur weiteren Minimierung der Traumatisierung und zur Erhaltung der strukturellen anatomischen Integrität soll eine alternative endoskopische Operationstechnik entwickelt werden, bei der der Situs durch dünne im Knochen liegende Bohrkanäle erreicht wird. Im Rahmen der Evaluierung der generellen Eignung der geometrischen Ausprägungen der humanen lateralen Schädelbasis wurden Methoden entwickelt, die anhand virtueller Modelle die Zugänglichkeit der anatomischen Zielstrukturen bestimmen können. Ein dabei auftretendes Problem ist die interindividuelle Vergleichbarkeit der Ergebnisse, da aufgrund der anatomischen Variationen eine zuverlässige interindividuelle Registrierung nicht trivial ist. Diese Arbeit beschreibt ein modellbasiertes Verfahren zur automatischen Registrierung mehrerer Felsenbeine zu einander über die prägnante Geometrie der Cochlea.

  18. PREFACE: 11th International Conference on Electrorheological Fluids and Magnetorheological Suspensions

    NASA Astrophysics Data System (ADS)

    Odenbach, Stefan; Borin, Dmitry

    2009-07-01

    Materials with properties controllable by external fields become more and more important for modern product design. Magnetorheological suspensions, electrorheological fluids and ferrofluids are classical examples for such smart materials exhibiting magnetic or electric field dependent properties. Their development over the past 60 years has shown how complex research and development of fluids with tailored properties can be. The demands of potential applications are the driving force for the synthesis of new fluids. The changes in the synthetic process and the composition of the fluids based on an increasing understanding of the relevant microscopic processes leads to certain macroscopic properties of the material. Only intense cooperation between basic and application oriented research, synthesis, characterisation, theory and application design can finally lead to fluids suitable for the envisaged use. The International Conferences on Electrorheological Fluids and Magnetorheological Suspensions have provided over more than 20 years a platform for interdisciplinary discussions strengthening the scientific progress in the field. Besides being a forum for scientific exchange about recent developments in electro- and magnetorheological fluids. The 11th International Conference on Electrorheological Fluids and Magnetorheological Suspensions (ERMR08) which has been organized by the chair of Magnetofluiddynamics at the Technische Universität Dresden in August 2008 in Dresden has continued this fruitful tradition. With more than 180 participants from 24 different countries it has been the largest ERMR meeting during the last decade - a tendency showing the high potential and promising development of the field of electrically and magnetically controllable fluids. A significant proportion of the participants were PhD students, a fact that also highlights the sustainability of the field. In total 85 oral presentations - including 8 plenary talks - and 81 posters were

  19. PREFACE: The International Conference on Highly Frustrated Magnetism HFM2008

    NASA Astrophysics Data System (ADS)

    Eremin, Ilya; Brenig, Wolfram; Kremer, Reinhard; Litterst, Jochen

    2009-01-01

    The International Conference on Highly Frustrated Magnetism 2008 (HFM2008) took place on 7-12 September 2008 at the Technische Universität Carolo-Wilhelmina zu Braunschweig, Germany. This conference was the fourth event in a series of meetings, which started in Waterloo, Canada (HFM 2000), followed by the second one in Grenoble, France (HFM 2003), and the third meeting in Osaka, Japan (HFM 2006). HFM2008 attracted more than 220 participants from all over the world. The number of participants of the HFM conference series has been increasing steadily, from about 80 participants at HFM 2000, to 120 participants at HFM 2003, and 190 participants at HFM 2006, demonstrating that highly frustrated magnetism remains a rapidly growing area of research in condensed matter physics. At the end of HFM2008 it was decided that the next International Conference on Highly Frustrated Magnetism will be held in Baltimore, USA in 2010. HFM2008 saw four plenary talks by R Moessner, S Nakatsuji, S-W Cheong, and S Sachdev, 18 invited presentations, 30 contributed talks and about 160 poster presentations from all areas of frustrated magnetism. The subjects covered by the conference included: Kagome systems Itinerant frustrated systems Spinels and pyrochlore materials Triangular systems Unconventional order and spin liquids Chain systems Chain systems Novel frustrated systems This volume of Journal of Physics: Conference Series contains the proceedings of HFM2008 with 83 papers that provide a scientific record of the scientific topics covered by the conference. All articles have been refereed by experts in the field. It is our hope that the reader will enjoy and profit from the HFM2008 Proceedings. Ilya Eremin Proceedings Editor Wolfram Brenig, Reinhard Kremer, and Jochen Litterst Co-Editors International Advisory Board L Balents (USA) F Becca (Italy) S Bramwell (UK) P Fulde (Germany) B D Gaulin (Canada) J E Greedan (Canada) A Harrison (France) Z Hiroi (Japan) H Kawamura (Japan) A Keren

  20. Review of access, licenses and understandability of open datasets used in hydrology research

    NASA Astrophysics Data System (ADS)

    Falkenroth, Esa; Arheimer, Berit; Lagerbäck Adolphi, Emma

    2015-04-01

    The amount of open data available for hydrology research is continually growing. In the EU-funded project SWITCH-ON (Sharing Water-related Information to Tackle Changes in the Hydrosphere - for Operational Needs), we are addressing water concerns by exploring and exploiting the untapped potential of these new open data. This work is enabled by many ongoing efforts to facilitate the use of open data. For instance, a number of portals (such as the GEOSS Portal and the INSPIRE community geoportal) provide the means to search for such open data sets and open spatial data services. However, in general, the systematic use of available open data is still fairly uncommon in hydrology research. Factors that limits (re)usability of a data set include: (1) accessibility, (2) understandability and (3) licences. If you cannot access the data set, you cannot use if for research. If you cannot understand the data set you cannot use it for research. Finally, if you are not permitted to use the data, you cannot use it for research. Early on in the project, we sent out a questionnaire to our research partners (SMHI, Universita di Bologna, University of Bristol, Technische Universiteit Delft and Technische Universitaet Wien) to find out what data sets they were planning to use in their experiments. The result was a comprehensive list of useful open data sets. Later, this list of data sets was extended with additional information on data sets for planned commercial water-information products and services. With the list of 50 common data sets as a starting point, we reviewed issues related to access, understandability and licence conditions. Regarding access to data sets, a majority of data sets were available through direct internet download via some well-known transfer protocol such as ftp or http. However, several data sets were found to be inaccessible due to server downtime, incorrect links or problems with the host database management system. One possible explanation for this

  1. Development of micro-pore optics for x-ray applications

    NASA Astrophysics Data System (ADS)

    Wallace, Kotska; Collon, Maximilien; Bavdaz, Marcos; Beijersbergen, Marco; Fairbend, Ray; Seguy, Julien; Hoffmann, Michael; Krumrey, Michael

    2005-08-01

    With Photonis and cosine Research BV, ESA has been developing and testing micro pore optics for x-ray imaging. Applications of the technology are foreseen to reduce mass and volume in, for example, a planetary x-ray imager, x-ray timing observatory or high-energy astrophysics. Photonis, a world leader in the design and development of micro pore optics, have developed a technique for manufacturing square channel pores formed from extruded glass fibres. Single square fibres, formed with soluble glass cores, are stacked into a former and redrawn to form multifibres of the required dimension. Radial sectors of an optic are then cut from a block formed by stacking multifibres and fusing them to form a monolithic glass structure. Sectors can be sliced, polished, etched and slumped to form the segment of an optic with specific radius. Two of these sectors will be mounted to form, for example, a Wolter I optic configuration. To improve reflectivity of the channel surfaces coating techniques have also been considered. The results of x-ray tests performed by ESA and cosine Research, using the BESSY-II synchrotron facility four-crystal monochromator beamline of the Physikalisch-Technische Bundesanstalt (PTB), on multi-fibres, sectors and slumped sectors will be discussed in this paper. Test measurements determine the x-ray transmission and focussing characteristics as they relate to the overall transmission, x-ray reflectivity of the channel walls, radial alignment of the fibres, slumping radius and fibre position in a fused block. The multifibres and sectors have also been inspected under microscope and Scanning electron Microscope (SEM) to inspect the channel walls and determine the improvements made in fibre stacking.

  2. TUM Critical Zone Observatory, Germany

    NASA Astrophysics Data System (ADS)

    Völkel, Jörg; Eden, Marie

    2014-05-01

    Founded 2011 the TUM Critical Zone Observatory run by the Technische Universität München and partners abroad is the first CZO within Germany. TUM CZO is both, a scientific as well as an education project. It is a watershed based observatory, but moving behind this focus. In fact, two mountainous areas are integrated: (1) The Ammer Catchment area as an alpine and pre alpine research area in the northern limestone Alps and forelands south of Munich; (2) the Otter Creek Catchment in the Bavarian Forest with a crystalline setting (Granite, Gneiss) as a mid mountainous area near Regensburg; and partly the mountainous Bavarian Forest National Park. The Ammer Catchment is a high energy system as well as a sensitive climate system with past glacial elements. The lithology shows mostly carbonates from Tertiary and Mesozoic times (e.g. Flysch). Source-to-sink processes are characteristic for the Ammer Catchment down to the last glacial Ammer Lake as the regional erosion and deposition base. The consideration of distal depositional environments, the integration of upstream and downstream landscape effects are characteristic for the Ammer Catchment as well. Long term datasets exist in many regards. The Otter Creek catchment area is developed in a granitic environment, rich in saprolites. As a mid mountainous catchment the energy system is facing lower stage. Hence, it is ideal comparing both of them. Both TUM CZO Catchments: The selected catchments capture the depositional environment. Both catchment areas include historical impacts and rapid land use change. Crosscutting themes across both sites are inbuilt. Questions of ability to capture such gradients along climosequence, chronosequence, anthroposequence are essential.

  3. SUMIRAD: a near real-time MMW radiometer imaging system for threat detection in an urban environment

    NASA Astrophysics Data System (ADS)

    Dill, Stephan; Peichl, Markus; Rudolf, Daniel

    2012-10-01

    The armed forces are nowadays confronted with a wide variety of types of operations. During peace keeping missions in an urban environment, where small units patrol the streets with armored vehicles, the team leader is confronted with a very complex threat situation. The asymmetric imminence arises in most cases from so called IEDs (Improvised explosive devices) which are found in a multitude of versions. In order to avoid risky situations the early detection of possible threats due to advanced reconnaissance and surveillance sensors will provide an important advantage. A European consortium consisting of GMV S.A. (Spain, "Grupo Tecnològico e Industrial"), RMA (Belgium, "Royal Military Academy"), TUM ("Technische Universität München") and DLR (Germany, "Deutsches Zentrum für Luft- und Raumfahrt") developed in the SUM project (Surveillance in an urban environment using mobile sensors) a low-cost multi-sensor vehicle based surveillance system in order to enhance situational awareness for moving security and military patrols as well as for static checkpoints. The project was funded by the European Defense Agency (EDA) in the Joint Investment Program on Force Protection (JIP-FP). The SUMIRAD (SUM imaging radiometer) system, developed by DLR, is a fast radiometric imager and part of the SUM sensor suite. This paper will present the principle of the SUMIRAD system and its key components. Furthermore the image processing will be described. Imaging results from several measurement campaigns will be presented. The overall SUM system and the individual subsystems are presented in more detail in separate papers during this conference.

  4. Absolute silicon molar mass measurements, the Avogadro constant and the redefinition of the kilogram

    NASA Astrophysics Data System (ADS)

    Vocke, R. D., Jr.; Rabb, S. A.; Turk, G. C.

    2014-10-01

    The results of an absolute silicon molar mass determination of two independent sets of samples from the highly 28Si-enriched crystal (AVO28) produced by the International Avogadro Coordination are presented and compared with results published by the Physikalisch-Technische Bundesanstalt (PTB, Germany), the National Research Council (NRC, Canada) and the National Metrology Institute of Japan (NMIJ, Japan). This study developed and describes significant changes to the published protocols for producing absolute silicon isotope ratios. The measurements were made at very high resolution on a multi-collector inductively coupled plasma mass spectrometer using tetramethylammonium hydroxide (TMAH) to dissolve and dilute all samples. The various changes in the measurement protocol and the use of TMAH resulted in significant improvements to the silicon isotope ratio precision over previously reported measurements and in particular, the robustness of the 29Si/30Si ratio of the AVO28 material. These new results suggest that a limited isotopic variability is present in the AVO28 material. The presence of this variability is at present singular and therefore its significance is not well understood. Fortunately, its magnitude is small enough so as to have an insignificant effect on the overall uncertainty of an Avogadro constant derived from the average molar mass of all four AVO28 silicon samples measured in this study. The NIST results confirm the AVO28 molar mass values reported by PTB and NMIJ and confirm that the virtual element-isotope dilution mass spectrometry approach to calibrated absolute isotope ratio measurements developed by PTB is capable of very high precision as well as accuracy. The Avogadro constant NA and derived Planck constant h based on these measurements, together with their associated standard uncertainties, are 6.02214076(19) × 1023 mol-1 and 6.62607017(21) × 10-34 Js, respectively.

  5. Application of advanced shearing techniques to the calibration of autocollimators with small angle generators and investigation of error sources.

    PubMed

    Yandayan, T; Geckeler, R D; Aksulu, M; Akgoz, S A; Ozgur, B

    2016-05-01

    The application of advanced error-separating shearing techniques to the precise calibration of autocollimators with Small Angle Generators (SAGs) was carried out for the first time. The experimental realization was achieved using the High Precision Small Angle Generator (HPSAG) of TUBITAK UME under classical dimensional metrology laboratory environmental conditions. The standard uncertainty value of 5 mas (24.2 nrad) reached by classical calibration method was improved to the level of 1.38 mas (6.7 nrad). Shearing techniques, which offer a unique opportunity to separate the errors of devices without recourse to any external standard, were first adapted by Physikalisch-Technische Bundesanstalt (PTB) to the calibration of autocollimators with angle encoders. It has been demonstrated experimentally in a clean room environment using the primary angle standard of PTB (WMT 220). The application of the technique to a different type of angle measurement system extends the range of the shearing technique further and reveals other advantages. For example, the angular scales of the SAGs are based on linear measurement systems (e.g., capacitive nanosensors for the HPSAG). Therefore, SAGs show different systematic errors when compared to angle encoders. In addition to the error-separation of HPSAG and the autocollimator, detailed investigations on error sources were carried out. Apart from determination of the systematic errors of the capacitive sensor used in the HPSAG, it was also demonstrated that the shearing method enables the unique opportunity to characterize other error sources such as errors due to temperature drift in long term measurements. This proves that the shearing technique is a very powerful method for investigating angle measuring systems, for their improvement, and for specifying precautions to be taken during the measurements.

  6. Feasibility study of entrance and exit dose measurements at the contra lateral breast with alanine/electron spin resonance dosimetry in volumetric modulated radiotherapy of breast cancer

    NASA Astrophysics Data System (ADS)

    Wagner, Daniela M.; Hüttenrauch, Petra; Anton, Mathias; von Voigts-Rhetz, Philip; Zink, Klemens; Wolff, Hendrik A.

    2017-07-01

    The Physikalisch-Technische Bundesanstalt has established a secondary standard measurement system for the dose to water, D W, based on alanine/ESR (Anton et al 2013 Phys. Med. Biol. 58 3259-82). The aim of this study was to test the established measurement system for the out-of-field measurements of inpatients with breast cancer. A set of five alanine pellets were affixed to the skin of each patient at the contra lateral breast beginning at the sternum and extending over the mammilla to the distal surface. During 28 fractions with 2.2 Gy per fraction, the accumulated dose was measured in four patients. A cone beam computer tomography (CBCT) scan was generated for setup purposes before every treatment. The reference CT dataset was registered rigidly and deformably to the CBCT dataset for 28 fractions. To take the actual alanine pellet position into account, the dose distribution was calculated for every fraction using the Acuros XB algorithm. The results of the ESR measurements were compared to the calculated doses. The maximum dose measured at the sternum was 19.9 Gy  ±  0.4 Gy, decreasing to 6.8 Gy  ±  0.2 Gy at the mammilla and 4.5 Gy  ±  0.1 Gy at the distal surface of the contra lateral breast. The absolute differences between the calculated and measured doses ranged from  -1.9 Gy to 0.9 Gy. No systematic error could be seen. It was possible to achieve a combined standard uncertainty of 1.63% for D W  =  5 Gy for the measured dose. The alanine/ESR method is feasible for in vivo measurements.

  7. Bubble reconstruction method for wire-mesh sensors measurements

    NASA Astrophysics Data System (ADS)

    Mukin, Roman V.

    2016-08-01

    A new algorithm is presented for post-processing of void fraction measurements with wire-mesh sensors, particularly for identifying and reconstructing bubble surfaces in a two-phase flow. This method is a combination of the bubble recognition algorithm presented in Prasser (Nuclear Eng Des 237(15):1608, 2007) and Poisson surface reconstruction algorithm developed in Kazhdan et al. (Poisson surface reconstruction. In: Proceedings of the fourth eurographics symposium on geometry processing 7, 2006). To verify the proposed technique, a comparison was done of the reconstructed individual bubble shapes with those obtained numerically in Sato and Ničeno (Int J Numer Methods Fluids 70(4):441, 2012). Using the difference between reconstructed and referenced bubble shapes, the accuracy of the proposed algorithm was estimated. At the next step, the algorithm was applied to void fraction measurements performed in Ylönen (High-resolution flow structure measurements in a rod bundle (Diss., Eidgenössische Technische Hochschule ETH Zürich, Nr. 20961, 2013) by means of wire-mesh sensors in a rod bundle geometry. The reconstructed bubble shape yields bubble surface area and volume, hence its Sauter diameter d_{32} as well. Sauter diameter is proved to be more suitable for bubbles size characterization compared to volumetric diameter d_{30}, proved capable to capture the bi-disperse bubble size distribution in the flow. The effect of a spacer grid was studied as well: For the given spacer grid and considered flow rates, bubble size frequency distribution is obtained almost at the same position for all cases, approximately at d_{32} = 3.5 mm. This finding can be related to the specific geometry of the spacer grid or the air injection device applied in the experiments, or even to more fundamental properties of the bubble breakup and coagulation processes. In addition, an application of the new algorithm for reconstruction of a large air-water interface in a tube bundle is

  8. Absolute radiant power measurement for the Au M lines of laser-plasma using a calibrated broadband soft X-ray spectrometer with flat-spectral response

    NASA Astrophysics Data System (ADS)

    Troussel, Ph.; Villette, B.; Emprin, B.; Oudot, G.; Tassin, V.; Bridou, F.; Delmotte, F.; Krumrey, M.

    2014-01-01

    CEA implemented an absolutely calibrated broadband soft X-ray spectrometer called DMX on the Omega laser facility at the Laboratory for Laser Energetics (LLE) in 1999 to measure radiant power and spectral distribution of the radiation of the Au plasma. The DMX spectrometer is composed of 20 channels covering the spectral range from 50 eV to 20 keV. The channels for energies below 1.5 keV combine a mirror and a filter with a coaxial photo-emissive detector. For the channels above 5 keV the photoemissive detector is replaced by a conductive detector. The intermediate energy channels (1.5 keV < photon energy < 5 keV) use only a filter and a coaxial detector. A further improvement of DMX consists in flat-response X-ray channels for a precise absolute measurement of the photon flux in the photon energy range from 0.1 keV to 6 keV. Such channels are equipped with a filter, a Multilayer Mirror (MLM), and a coaxial detector. We present as an example the development of channel for the gold M emission lines in the photon energy range from 2 keV to 4 keV which has been successfully used on the OMEGA laser facility. The results of the radiant power measurements with the new MLM channel and with the usual channel composed of a thin titanium filter and a coaxial detector (without mirror) are compared. All elements of the channel have been calibrated in the laboratory of the Physikalisch-Technische Bundesanstalt, Germany's National Metrology Institute, at the synchrotron radiation facility BESSY II in Berlin using dedicated well established and validated methods.

  9. CALIBRATION OF X-RAY IMAGING DEVICES FOR ACCURATE INTENSITY MEASUREMENT

    SciTech Connect

    Haugh, M J; Charest, M R; Ross, P W; Lee, J J; Schneider, M B; Palmer, N E; Teruya, A T

    2012-02-16

    National Security Technologies (NSTec) has developed calibration procedures for X-ray imaging systems. The X-ray sources that are used for calibration are both diode type and diode/fluorescer combinations. Calibrating the X-ray detectors is key to accurate calibration of the X-ray sources. Both energy dispersive detectors and photodiodes measuring total flux were used. We have developed calibration techniques for the detectors using radioactive sources that are traceable to the National Institute of Standards and Technology (NIST). The German synchrotron at Physikalische Technische Bundestalt (PTB) is used to calibrate silicon photodiodes over the energy range from 50 eV to 60 keV. The measurements on X-ray cameras made using the NSTec X-ray sources have included quantum efficiency averaged over all pixels, camera counts per photon per pixel, and response variation across the sensor. The instrumentation required to accomplish the calibrations is described. X-ray energies ranged from 720 eV to 22.7 keV. The X-ray sources produce narrow energy bands, allowing us to determine the properties as a function of X-ray energy. The calibrations were done for several types of imaging devices. There were back illuminated and front illuminated CCD (charge coupled device) sensors, and a CID (charge injection device) type camera. The CCD and CID camera types differ significantly in some of their properties that affect the accuracy of X-ray intensity measurements. All cameras discussed here are silicon based. The measurements of quantum efficiency variation with X-ray energy are compared to models for the sensor structure. Cameras that are not back-thinned are compared to those that are.

  10. An early industrial charcoal production area in Lower Lusatia (Germany) - a GIS-based reconstruction of past land use and environmental change

    NASA Astrophysics Data System (ADS)

    Takla, M.; Müller, F.; Nicolay, A.; Raab, A.; Raab, T.; Rösler, H.; Bönisch, E.

    2012-04-01

    As by-product of systematic archaeological research in the prefield of the open-cast mine Jänschwalde (Lower Lusatia, Germany) archaeologists of the Brandenburgisches Landesamt für Denkmalpflege und Archäologisches Landesmuseum (BLDAM) revealed Germanýs probably largest investigated charcoal production area. Until know c. 700 ground plans of circular upright kilns are excavated and additional c. 300 kilns are prospected. The numerousness of charcoal kilns and in particular the large diameters of the ground plans (up to 20 m and more) suggest an industrial charcoal production for the smelter at Peitz nearby where bog iron ore was processed since 1567. The investigation of this early industrial charcoal production is part of the collaborative work between geomorphologists, soil scientists and historians of the Brandenburgische Technische Universität Cottbus (BTU) and archaeologists of the BLDAM. A core piece of the interdisciplinary research is the development of a new paleoenvironmental model based on a Geographical Information System (GIS). The model uses airborne laser scanning data with an accuracy of 1 m, archaeological finds, geographical data like topography, soils, geology, hydrology and land use, but also historical maps from the 18th century onwards, information from historical archives as well as data from absolute and relative age determinations. The location of the charcoal hearths and other finds are examined with regard to physio-geographical settings and land tenure. The model has a scale of 1:10000 and will be calibrated and supplemented with data from ongoing archaeological, geomorphological and pedological investigations. We present the status of our model approach as well as first results. Special emphasis is given on the reconstruction of past landforms and geomorphic processes documented by buried soils and late Holocene eolian sediments. Due to the excellent outcrop situation in the open-cast mine our model results are very well proven and

  11. SMI: a structural dynamics toolbox for integrated modeling

    NASA Astrophysics Data System (ADS)

    Mueller, Michael; Baier, Horst

    2002-07-01

    In cooperation with the European Southern Observatory (ESO), the Institute of Lightweight Structures (LLB), Technische Universtitaet Muenchen, has developed the Structural Modeling Interface Toolbox (SMI), a Matlab based software package for creation of a dynamical model of a telescope structure. It is called Interface, since it uses the modal data of a finite element (FE) analysis and creates a dynamic model to be used within a time-dependent control loop simulation in the Matlab/Simulink environment. SMI is part of the Integrated Modeling Toolbox (IMT) developed in a joint effort by ESO, Astrium GmbH and LLB. Since SMI can read modal data in a general format, it is not depending on the FE-software. In addition to that, an interface to the FE-package ANSYS has been developed. It allows the variation of parameters and some settings for the FE-analysis directly within SMI. Both, force excitation like windloads and base excitation like micro seismic perturbations can be included. Several tools for model reduction are provided. Some of them are modal based, like effective modal masses, others are general model reduction procedures from control engineering like balanced truncation. For the evaluation of the reduced models, transfer functions of different models can be displayed in a Bode-plot. Time characteristics like step response or impulse response are also available. Moreover, for a typical excitation PSD the response PSD can be computed. This response can either be compared to the response of an exact model or to measured data and the rms-error can be calculated. The final result is a linear statespace model of the structure and a Simulink block, which can be included into a Simulink model.

  12. The subjective experience of collaboration in interprofessional tutor teams: A qualitative study

    PubMed Central

    Weber, Tobias; Hoffmann, Henriette

    2016-01-01

    Aim: The Center for Interprofessional Training in Medicine at the Faculty of Medicine Carl Gustav Carus at the Technische Universität Dresden, Germany, has offered courses covering interprofessional material since the winter semester 2014/15. The unusual feature of these courses is that they are co-taught by peer tutors from medicine and nursing. This study investigates the subjective experiences of these tutors during the collaborative preparation and teaching of these tutorials with the aim of identifying the effects of equal participation in the perceptions and assessments of the other professional group. Method: Semi-structured, guideline-based interviews were held with six randomly selected tutors. The interviews were analyzed using structuring content analysis. Results: The results show that collaborative work led to reflection, mostly by the university student tutors, on the attitudes held. However, the co-tutors from each professional group were perceived to different degrees as being representative of those in their profession. Asked to master a shared assignment in a non-clinical context, the members of the different professional groups met on equal footing, even if the medical students had already gathered more teaching experience and thus mostly assumed a mentoring role over the course of working on and realizing the teaching units. The nursing tutors were primarily focused on their role as tutor. Both professional groups emphasized that prior to the collaboration they had an insufficient or no idea about the theoretical knowledge or practical skills of the other professional group. Overall, the project was rated as beneficial, and interprofessional education was endorsed. Conclusion: In the discussion, recommendations based on the insights are made for joint tutor training of both professional groups. According to these recommendations, harmonizing the teaching abilities of all tutors is essential to ensure equality during cooperation. Ideally

  13. New blackbody standard for the evaluation and calibration of tympanic ear thermometers at the NPL, United Kingdom

    NASA Astrophysics Data System (ADS)

    McEvoy, Helen C.; Simpson, Robert; Machin, Graham

    2004-04-01

    The use of infrared tympanic thermometers for monitoring patient health is widespread. However, studies into the performance of these thermometers have questioned their accuracy and repeatability. To give users confidence in these devices, and to provide credibility in the measurements, it is necessary for them to be tested using an accredited, standard blackbody source, with a calibration traceable to the International Temperature Scale of 1990 (ITS-90). To address this need the National Physical Laboratory (NPL), UK, has recently set up a primary ear thermometer calibration (PET-C) source for the evaluation and calibration of tympanic (ear) thermometers over the range from 15 °C to 45 °C. The overall uncertainty of the PET-C source is estimated to be +/- 0.04 °C at k = 2. The PET-C source meets the requirements of the European Standard EN 12470-5: 2003 Clinical thermometers. It consists of a high emissivity blackbody cavity immersed in a bath of stirred liquid. The temperature of the blackbody is determined using an ITS-90 calibrated platinum resistance thermometer inserted close to the rear of the cavity. The temperature stability and uniformity of the PET-C source was evaluated and its performance validated. This paper provides a description of the PET-C along with the results of the validation measurements. To further confirm the performance of the PET-C source it was compared to the standard ear thermometer calibration sources of the National Metrology Institute of Japan (NMIJ), Japan and the Physikalisch-Technische Bundesanstalt (PTB), Germany. The results of this comparison will also be briefly discussed. The PET-C source extends the capability for testing ear thermometers offered by the NPL body temperature fixed-point source, described previously. An update on the progress with the commercialisation of the fixed-point source will be given.

  14. Calibration of X-ray imaging devices for accurate intensity measurement

    SciTech Connect

    Haugh, Michael J.; Charest, Michael R.; Ross, Patrick W.; Lee, Joshua J.; Schneider, Marilyn B.; Palmer, Nathan E.; Teruya, Alan T.

    2012-06-15

    National Security Technologies (NSTec) has developed calibration procedures for X-ray imaging systems using NIST traceable sources. The X-ray sources that are used for calibration are both diode type and diode/fluorescer combinations. Calibrating the X-ray detectors is the key to accurate calibration of the X-ray sources. Both energy dispersive detectors and photodiodes measuring total flux were used. We have developed calibration techniques for the detectors using radioactive sources that are traceable to the National Institute of Standards and Technology (NIST). The German synchrotron at Physikalische Technische Bundestalt (PTB) is used to calibrate silicon photodiodes over the energy range from 50 eV to 60 keV. The measurements on X-ray cameras made using the NSTec X-ray sources have included the quantum efficiency averaged over all pixels, the camera counts per photon per pixel, and response variation across the sensor. The instrumentation required to accomplish the calibrations is described. X-ray energies ranged from 720 eV to 22.7 keV. The X-ray sources produce narrow energy bands, allowing us to determine the properties as a function of X-ray energy. The calibrations were done for several types of imaging devices. There were back illuminated and front illuminated CCD (charge coupled device) sensors, and a CID (charge injection device) type camera. The CCD and CID camera types differ significantly in some of their properties that affect the accuracy of X-ray intensity measurements. All cameras discussed here are silicon based. The measurements of quantum efficiency variation with X-ray energy are compared to models for the sensor structure. Cameras that are not back-thinned are compared to those that are.

  15. Absolute radiant power measurement for the Au M lines of laser-plasma using a calibrated broadband soft X-ray spectrometer with flat-spectral response

    SciTech Connect

    Troussel, Ph.; Villette, B.; Oudot, G.; Tassin, V.; Bridou, F.; Delmotte, F.; Krumrey, M.

    2014-01-15

    CEA implemented an absolutely calibrated broadband soft X-ray spectrometer called DMX on the Omega laser facility at the Laboratory for Laser Energetics (LLE) in 1999 to measure radiant power and spectral distribution of the radiation of the Au plasma. The DMX spectrometer is composed of 20 channels covering the spectral range from 50 eV to 20 keV. The channels for energies below 1.5 keV combine a mirror and a filter with a coaxial photo-emissive detector. For the channels above 5 keV the photoemissive detector is replaced by a conductive detector. The intermediate energy channels (1.5 keV < photon energy < 5 keV) use only a filter and a coaxial detector. A further improvement of DMX consists in flat-response X-ray channels for a precise absolute measurement of the photon flux in the photon energy range from 0.1 keV to 6 keV. Such channels are equipped with a filter, a Multilayer Mirror (MLM), and a coaxial detector. We present as an example the development of channel for the gold M emission lines in the photon energy range from 2 keV to 4 keV which has been successfully used on the OMEGA laser facility. The results of the radiant power measurements with the new MLM channel and with the usual channel composed of a thin titanium filter and a coaxial detector (without mirror) are compared. All elements of the channel have been calibrated in the laboratory of the Physikalisch-Technische Bundesanstalt, Germany's National Metrology Institute, at the synchrotron radiation facility BESSY II in Berlin using dedicated well established and validated methods.

  16. Absolute radiant power measurement for the Au M lines of laser-plasma using a calibrated broadband soft X-ray spectrometer with flat-spectral response.

    PubMed

    Troussel, Ph; Villette, B; Emprin, B; Oudot, G; Tassin, V; Bridou, F; Delmotte, F; Krumrey, M

    2014-01-01

    CEA implemented an absolutely calibrated broadband soft X-ray spectrometer called DMX on the Omega laser facility at the Laboratory for Laser Energetics (LLE) in 1999 to measure radiant power and spectral distribution of the radiation of the Au plasma. The DMX spectrometer is composed of 20 channels covering the spectral range from 50 eV to 20 keV. The channels for energies below 1.5 keV combine a mirror and a filter with a coaxial photo-emissive detector. For the channels above 5 keV the photoemissive detector is replaced by a conductive detector. The intermediate energy channels (1.5 keV < photon energy < 5 keV) use only a filter and a coaxial detector. A further improvement of DMX consists in flat-response X-ray channels for a precise absolute measurement of the photon flux in the photon energy range from 0.1 keV to 6 keV. Such channels are equipped with a filter, a Multilayer Mirror (MLM), and a coaxial detector. We present as an example the development of channel for the gold M emission lines in the photon energy range from 2 keV to 4 keV which has been successfully used on the OMEGA laser facility. The results of the radiant power measurements with the new MLM channel and with the usual channel composed of a thin titanium filter and a coaxial detector (without mirror) are compared. All elements of the channel have been calibrated in the laboratory of the Physikalisch-Technische Bundesanstalt, Germany's National Metrology Institute, at the synchrotron radiation facility BESSY II in Berlin using dedicated well established and validated methods.

  17. OnlineTED.com − a novel web-based audience response system for higher education. A pilot study to evaluate user acceptance

    PubMed Central

    Kühbeck, Felizian; Engelhardt, Stefan; Sarikas, Antonio

    2014-01-01

    Background and aim: Audience response (AR) systems are increasingly used in undergraduate medical education. However, high costs and complexity of conventional AR systems often limit their use. Here we present a novel AR system that is platform independent and does not require hardware clickers or additional software to be installed. Methods and results: “OnlineTED” was developed at Technische Universität München (TUM) based on Hypertext Preprocessor (PHP) with a My Structured Query Language (MySQL)-database as server- and Javascript as client-side programming languages. “OnlineTED” enables lecturers to create and manage question sets online and start polls in-class via a web-browser. Students can participate in the polls with any internet-enabled device (smartphones, tablet-PCs or laptops). A paper-based survey was conducted with undergraduate medical students and lecturers at TUM to compare "OnlineTED" with conventional AR systems using clickers. "OnlineTED" received above-average evaluation results by both students and lecturers at TUM and was seen on par or superior to conventional AR systems. The survey results indicated that up to 80% of students at TUM own an internet-enabled device (smartphone or tablet-PC) for participation in web-based AR technologies. Summary and Conclusion: “OnlineTED” is a novel web-based and platform-independent AR system for higher education that was well received by students and lecturers. As a non-commercial alternative to conventional AR systems it may foster interactive teaching in undergraduate education, in particular with large audiences. PMID:24575156

  18. Quantitative comparison between PGNAA measurements and MCNP calculations in view of the characterization of radioactive wastes in Germany and France

    SciTech Connect

    Mauerhofer, E.; Havenith, A.; Kettler, J.; Carasco, C.; Payan, E.; Ma, J. L.; Perot, B.

    2013-04-19

    The Forschungszentrum Juelich GmbH (FZJ), together with the Aachen University Rheinisch-Westfaelische Technische Hochschule (RWTH) and the French Alternative Energies and Atomic Energy Commission (CEA Cadarache) are involved in a cooperation aiming at characterizing toxic and reactive elements in radioactive waste packages by means of Prompt Gamma Neutron Activation Analysis (PGNAA). The French and German waste management agencies have indeed defined acceptability limits concerning these elements in view of their projected geological repositories. A first measurement campaign was performed in the new Prompt Gamma Neutron Activation Analysis (PGNAA) facility called MEDINA, at FZJ, to assess the capture gamma-ray signatures of some elements of interest in large samples up to waste drums with a volume of 200 liter. MEDINA is the acronym for Multi Element Detection based on Instrumental Neutron Activation. This paper presents MCNP calculations of the MEDINA facility and quantitative comparison between measurement and simulation. Passive gamma-ray spectra acquired with a high purity germanium detector and calibration sources are used to qualify the numerical model of the crystal. Active PGNAA spectra of a sodium chloride sample measured with MEDINA then allow for qualifying the global numerical model of the measurement cell. Chlorine indeed constitutes a usual reference with reliable capture gamma-ray production data. The goal is to characterize the entire simulation protocol (geometrical model, nuclear data, and postprocessing tools) which will be used for current measurement interpretation, extrapolation of the performances to other types of waste packages or other applications, as well as for the study of future PGNAA facilities.

  19. Seismic Investigation of the Glacier de la Plaine Morte, Switzerland

    NASA Astrophysics Data System (ADS)

    Laske, Gabi; Lindner, Fabian; Walter, Fabian; Krage, Manuel

    2017-04-01

    Glacier de la Plaine Morte is a plateau glacier along the border between Valais and Berne cantons. It covers a narrow elevation range and is extremely vulnerable to climate change. During snow melt, it feeds three marginal lakes that have experienced sudden subglacial drainage in recent years, thereby causing flooding in the Simme Valley below. Of greatest concern is Lac des Faverges at the southeastern end of the glacier that has drained near the end of July in recent years, with flood levels reaching capacity of flood control systems downstream. The lake levels are carefully monitored but precise prediction has not yet been achieved. In the search for precursory ice fracturing to the lake drainage to improve forecast, four seismic arrays comprised of five short-period borehole seismometers provided by Eidgenössische Technische Hochschule (ETH), Zürich as well as fifteen 3-component geophones from the Geophysical Instrument Pool Potsdam (GIPP) collected continuous seismic data for about seven weeks during the summer of 2016. We present initial results on discharge dynamics as well as changing noise levels and seismicity before, during and after the drainage of Lac des Faverges. Compared to previous recent years, the 2016 drainage of Lac des Faverges occurred unusually late on August 28. With an aperture between 100 and 200 m, the small arrays recorded many hundred ice quakes per day. A majority of the events exhibits clearly dispersed, high-frequency Rayleigh waves at about 10 Hz and higher. A wide distribution of events allows us to study azimuthal anisotropy and its relationship with the orientation of glacial crevasses.

  20. Different survival outcomes after curative R0-resection for Eastern Asian and European gastric cancer

    PubMed Central

    Kim, Young-Woo; Joo, Jungnam; Yoon, Hong Man; Eom, Bang Wool; Ryu, Keun Won; Choi, Il Ju; Kook, Myeong Cherl; Schuhmacher, Christoph; Siewert, Joerg Ruediger; Reim, Daniel

    2016-01-01

    Abstract Several retrospective analyses on patients who underwent gastric cancer (GC) surgery revealed different survival outcomes between Eastern (Korean, Japanese) and Western (USA, Europe) countries due to potential ethnical and biological differences. This study investigates treatment outcomes between specialized institution for GC in Korea and Germany. The prospectively documented databases of the Gastric Cancer Center of the National Cancer Center, Korea (NCCK) and the Department of Surgery of the Technische Universitaet Muenchen (TUM), Germany were screened for patients who underwent primary surgical resection for GC between 2002 and 2008. Baseline characteristics were compared using χ2 testing, and 2 cohorts were matched using a propensity score matching (PSM) method. Patients’ survival was estimated using Kaplan–Meier method, and multivariable Cox proportional hazard model was used for comparison. Three thousand seven hundred ninety-five patients were included in the final analysis, 3542 from Korea and 253 from Germany. Baseline characteristics revealed statistically significant differences for age, tumor location, pT stage, grading, lymphatic vessel infiltration (LVI), comorbidities, number of dissected lymph nodes (LN), postoperative complications, lymph-node ratio stage, and application of adjuvant chemotherapy. After PSM, 171 patients in TUM were matched to NCCK patients, and baseline characteristics for both cohorts were well balanced. Patients in Korea had significantly longer survival than those in Germany both before and after PSM. When the analysis was performed for each UICC stage separately, same trend was found over all UICC stages before PSM. However, significant difference in survival was observed only for UICC I after PSM. This analysis demonstrates different survival outcomes after surgical treatment of GC on different continents in specialized centers after balancing of baseline characteristics by PSM. PMID:27428238

  1. KEY COMPARISON: Final report on CIPM key comparison CCM.D-K1: density measurements of a silicon sphere

    NASA Astrophysics Data System (ADS)

    Fujii, Kenichi; Bettin, Horst; Peuto, Anna; Chang, Kyung-Ho; Richard, Philippe; Jacques, Claude; Matilla Vicente, Carmen; Becerra, Luis Omar

    2006-01-01

    This report describes the results on a CIPM key comparison of solid density measurements, which was carried out through July 2001 to May 2003. This CIPM key comparison, designated as CCM.D-K1, was coordinated by the National Metrology Institute of Japan (NMIJ, Japan), Swiss Federal Office of Metrology and Accreditation (METAS, Switzerland) and National Research Council Canada (NRC, Canada). These three national metrology institutes (NMIs) formed a pilot group to determine the technical protocol for this key comparison. A total of eight NMIs, namely NMIJ, Physikalisch-Technische Bundesanstalt (PTB, Germany), Istituto di Metrologia 'G Colonnetti' (IMGC, Italy), Korea Research Institute of Standards and Science (KRISS, Korea), METAS, NRC, Centro Español de Metrologia (CEM, Spain) and National Center of Metrology (CENAM, Mexico), participated in this key comparison. A 1 kg single-crystal silicon sphere, prepared by NMIJ, was circulated to each of the NMIs as a travelling standard. Each NMI determined the mass, volume and density of the travelling standard with respect to the mass standard and solid density standard of each NMI by mass measurement and hydrostatic weighing. The reference value of the density was determined with a relative expanded uncertainty of 2.9 × 10-7. When the degrees of equivalence were evaluated by differences from the reference value, the differences for the mass, volume and density were almost equal to or less than expanded uncertainties of the differences, showing a good equivalence of the capabilities for the solid density measurement at the participating NMIs. Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCM, according to the provisions of the CIPM Mutual Recognition Arrangement (MRA).

  2. Broad-band efficiency calibration of ITER bolometer prototypes using Pt absorbers on SiN membranes

    NASA Astrophysics Data System (ADS)

    Meister, H.; Willmeroth, M.; Zhang, D.; Gottwald, A.; Krumrey, M.; Scholze, F.

    2013-12-01

    The energy resolved efficiency of two bolometer detector prototypes for ITER with 4 channels each and absorber thicknesses of 4.5 μm and 12.5 μm, respectively, has been calibrated in a broad spectral range from 1.46 eV up to 25 keV. The calibration in the energy range above 3 eV was performed against previously calibrated silicon photodiodes using monochromatized synchrotron radiation provided by five different beamlines of Physikalische Technische Bundesanstalt at the electron storage rings BESSY II and Metrology Light Source in Berlin. For the measurements in the visible range, a setup was realised using monochromatized halogen lamp radiation and a calibrated laser power meter as reference. The measurements clearly demonstrate that the efficiency of the bolometer prototype detectors in the range from 50 eV up to ≈6 keV is close to unity; at a photon energy of 20 keV the bolometer with the thick absorber detects 80% of the photons, the one with the thin absorber about 50%. This indicates that the detectors will be well capable of measuring the plasma radiation expected from the standard ITER scenario. However, a minimum absorber thickness will be required for the high temperatures in the central plasma. At 11.56 keV, the sharp Pt-L3 absorption edge allowed to cross-check the absorber thickness by fitting the measured efficiency to the theoretically expected absorption of X-rays in a homogeneous Pt-layer. Furthermore, below 50 eV the efficiency first follows the losses due to reflectance expected for Pt, but below 10 eV it is reduced further by a factor of 2 for the thick absorber and a factor of 4 for the thin absorber. Most probably, the different histories in production, storage, and operation led to varying surface conditions and additional loss channels.

  3. New VLBI Infrastructure for Earth Rotation Monitoring at Wettzell

    NASA Astrophysics Data System (ADS)

    Schüler, Torben; Nothnagel, Axel; Neidhardt, Alexander; Kronschnabl, Gerhard; Hugentobler, Urs; Kutterer, Hansjörg; Ihde, Johannes

    2014-05-01

    Very Long Baseline Interferometry (VLBI) is a key technology for precise monitoring of Earth's rotation. VLBI is the only space geodetic technique that allows for the determination of the absolute orientation of the Earth's rotation axis in space (nutation) and the absolute rotation angle of the Earth's body (UT1). VLBI is used to realize the International Celestial Reference Frame (ICRF) and contributes to the realization of the International Terrestrial Reference Frame (ITRF). In order to further improve accuracy, latency and availability of VLBI observations the International VLBI Service for Geodesy and Astrometry (IVS) developed the VLBI2010 concept aiming at more observations, larger bandwidth, and near-real time correlation. The implementation of the concept would allow for an uninterrupted high-accuracy monitoring of Earth's rotation. The Geodetic Observatory Wettzell is operated by the German Federal Agency for Cartography and Geodesy (BKG) together with Technische Universität Müchen (TUM) in the context of the Research Group Satellite Geodesy (FGS), a consortium of BKG, TUM, German Geodetic Research Institute (DFGI) and University of Bonn, Germany. The Wettzell observatory is on its way to operate a radio telescope triple: The 20 m radio telescope has been involved into geodetic VLBI observations since 1983. Recently two new 13.2 m VLBI telescopes were installed - the TWIN telescope - which adhere to the VLBI2010 concept and which will be part of VGOS, the newly developed VLBI Global Observing System of the International VLBI Service for Geodesy and Astrometry (IVS). Currently the high-frequency electronics, broadband receivers and feed horns, are being integrated and first operation is expected this year. The two telescopes allow for novel observation strategies, also in conjunction with the existing 20 m telescope. The upcoming new VLBI infrastructure will lead to more accurate, continuous and short-latency monitoring of the rotation of the Earth in

  4. Goniochromatic and sparkle properties of effect pigmented samples in multidimensional configuration

    NASA Astrophysics Data System (ADS)

    Höpe, Andreas; Hauer, Kai-Olaf; Teichert, Sven; Hünerhoff, Dirk; Strothkämper, Christian

    2015-03-01

    The effects of goniochromatism and sparkle are gaining more and more interest for surface refinement applications driven by demanding requirements from such different branches as automotive, cosmetics, printing and packaging industry. The common background and intention in all of these implementations is improvement of the visual appearance of the related commercial products. Goniochromatic materials show strong angular-dependent reflection characteristics and hence a color impression depending on the effective spatial arrangement of illumination and observation relative to the surface of the artifact. Sparkle is a texture related effect giving a surface which is irradiated directionally, like direct sun light, a bright glittering effect, similar to twinkling stars at the night sky. The prototype for this new effect is the Xirallic® pigment of MERCK KGaA, Germany. The same pigment shows in diffuse irradiation, like on a cloudy day, a different visual effect called graininess (coarseness) which appears as a granular structure of the surface. Both effects were studied on especially manufactured samples of a dilution series in pigment concentration and a tonality series with carbon black. The experiments were carried out with the robot-based gonioreflectometer and integrating sphere facilities at Physikalisch-Technische Bundesanstalt (PTB) in multidimensional configurations of directional and diffuse irradiation. The research is part of the European Metrology Research Program (EMRP), which is a metrology-focused program of coordinated Research & Development (R&D) funded by the European Commission and participating countries within the European Association of National Metrology Institutes (EURAMET). More information and updated news concerning the project can be found on the xD-Reflect website http://www.xdreflect.eu/.

  5. High-resolution global forward modelling: a degree-5480 global ellipsoidal topographic potential model

    NASA Astrophysics Data System (ADS)

    Rexer, Moritz; Hirt, Christian; Pail, Roland

    2017-04-01

    The development of parallel computing and arithmetically extended integration algorithms make forward modelling of the gravitational potential of Earth possible on a global scale with very high resolution. We make use of an efficient spectral integration method and a composite global source-mass model developed at Technische Universität München over the past two years. The integration method allows the rigorous definition of an arbitrary number of volumetric mass layers of laterally varying mass-density that are referenced to an oblate ellipsoid of revolution. Often used simplifications such as spherical approximations and the rock-equivalent-topography concept are avoided in our modelling technique. Starting from band-limited degree-5400 layer-boundaries we demonstrate the creation of a (non-compensated) degree-5480 ellipsoidal topographic potential model that resolves the gravity field of Earth down to scales of ˜ 4 km. This involves multiple spherical harmonic analysis of the height-density functions and their first 25 integer powers to degree 5400. Stark oversampling is required in order to ban aliasing that otherwise would distort the short-scale gravitational signal. This results in large grids, dimensioned 64801 x 129601 (67 GB), initiating a parallelization of the analysis procedure. The ellipsoidal topographic potential model shows significant signal amplitudes in the spectral window ranging from degree 2161 to 5480 and we successfully demonstrate their importance in combined high-resolution gravity field modelling over various regions on Earth. As an aside the model reveals interesting insights into spherical harmonics at short scales: the signal degree variances actually are rising towards short scales since they refer to the spherical harmonic reference sphere, where short-scale signals are dramatically amplified due to the attenuation factors found in the spherical harmonic series expansion. The signal strengths at Earth's surface, in contrast, are

  6. The MICROSCOPE inertial sensor: qualification status

    NASA Astrophysics Data System (ADS)

    Santos Rodrigues, Manuel; Touboul, Pierre; Liorzou, Francoise; Bodoville, Guillaume

    The payload of the MICROSCOPE space mission embarks two pairs of test-masses, made of Platinum Rhodium alloy and Titanium alloy, that are used to perform the test of the Uni-versality of free fall, i.e. of the Equivalence Principle (EP). These cylindrical test-masses are at the core of the inertial sensors used to perform the full drag-free and attitude control of the satellite. Based on electrostatic space accelerometers developed in ONERA, the payload has been designed with challenging technologies for the electronics and for the sensor core. Following a very specific development plan, the payload is currently in the qualification phase, by being integrated after a long period of challenging accurate production and metrology. The results obtained for the driving components of the expected performance will be addressed. In particular, the micrometric metrology of the instrument core, made in gold coated silica, will be presented: the specific ultra-sonic machining processes, optimized for this production, indeed exhibit a few micrometers accuracy. Similar accuracy is obtained for the geometry of the test-masses, produced and controlled in collaboration with the PTB, Physikalisch-Technische Bundesanstalt. This accurate geometry and the specific selected shape is mandatory to balance the mass moment of inertia for gravity gradient rejection and to highly decouple the instru-ment measurement axes. The first results of the flight model electronics will be also presented demonstrating micro-volt low noise and weak thermal sensitivity in good agreement with the requirements. At last, the development status of the payload will be mentioned insisting on the coming milestones.

  7. [Laser-based radiometric calibration].

    PubMed

    Li, Zhi-gang; Zheng, Yu-quan

    2014-12-01

    Increasingly higher demands are put forward to spectral radiometric calibration accuracy and the development of new tunable laser based spectral radiometric calibration technology is promoted, along with the development of studies of terrestrial remote sensing, aeronautical and astronautical remote sensing, plasma physics, quantitative spectroscopy, etc. Internationally a number of national metrology scientific research institutes have built tunable laser based spectral radiometric calibration facilities in succession, which are traceable to cryogenic radiometers and have low uncertainties for spectral responsivity calibration and characterization of detectors and remote sensing instruments in the UK, the USA, Germany, etc. Among them, the facility for spectral irradiance and radiance responsivity calibrations using uniform sources (SIRCCUS) at the National Institute of Standards and Technology (NIST) in the USA and the Tunable Lasers in Photometry (TULIP) facility at the Physikalisch-Technische Bundesanstalt (PTB) in Germany have more representatives. Compared with lamp-monochromator systems, laser based spectral radiometric calibrations have many advantages, such as narrow spectral bandwidth, high wavelength accuracy, low calibration uncertainty and so on for radiometric calibration applications. In this paper, the development of laser-based spectral radiometric calibration and structures and performances of laser-based radiometric calibration facilities represented by the National Physical Laboratory (NPL) in the UK, NIST and PTB are presented, technical advantages of laser-based spectral radiometric calibration are analyzed, and applications of this technology are further discussed. Laser-based spectral radiometric calibration facilities can be widely used in important system-level radiometric calibration measurements with high accuracy, including radiance temperature, radiance and irradiance calibrations for space remote sensing instruments, and promote the

  8. [Benchmark experiment to verify radiation transport calculations for dosimetry in radiation therapy].

    PubMed

    Renner, Franziska

    2016-09-01

    Monte Carlo simulations are regarded as the most accurate method of solving complex problems in the field of dosimetry and radiation transport. In (external) radiation therapy they are increasingly used for the calculation of dose distributions during treatment planning. In comparison to other algorithms for the calculation of dose distributions, Monte Carlo methods have the capability of improving the accuracy of dose calculations - especially under complex circumstances (e.g. consideration of inhomogeneities). However, there is a lack of knowledge of how accurate the results of Monte Carlo calculations are on an absolute basis. A practical verification of the calculations can be performed by direct comparison with the results of a benchmark experiment. This work presents such a benchmark experiment and compares its results (with detailed consideration of measurement uncertainty) with the results of Monte Carlo calculations using the well-established Monte Carlo code EGSnrc. The experiment was designed to have parallels to external beam radiation therapy with respect to the type and energy of the radiation, the materials used and the kind of dose measurement. Because the properties of the beam have to be well known in order to compare the results of the experiment and the simulation on an absolute basis, the benchmark experiment was performed using the research electron accelerator of the Physikalisch-Technische Bundesanstalt (PTB), whose beam was accurately characterized in advance. The benchmark experiment and the corresponding Monte Carlo simulations were carried out for two different types of ionization chambers and the results were compared. Considering the uncertainty, which is about 0.7 % for the experimental values and about 1.0 % for the Monte Carlo simulation, the results of the simulation and the experiment coincide.

  9. Relationships between atmospheric circulation indices and rainfall in Northern Algeria and comparison of observed and RCM-generated rainfall

    NASA Astrophysics Data System (ADS)

    Taibi, S.; Meddi, M.; Mahé, G.; Assani, A.

    2017-01-01

    This work aims, as a first step, to analyze rainfall variability in Northern Algeria, in particular extreme events, during the period from 1940 to 2010. Analysis of annual rainfall shows that stations in the northwest record a significant decrease in rainfall since the 1970s. Frequencies of rainy days for each percentile (5th, 10th, 25th, 50th, 75th, 90th, 95th, and 99th) and each rainfall interval class (1-5, 5-10, 10-20, 20-50, and ≥50 mm) do not show a significant change in the evolution of daily rainfall. The Tenes station is the only one to show a significant decrease in the frequency of rainy days up to the 75th percentile and for the 10-20-mm interval class. There is no significant change in the temporal evolution of extreme events in the 90th, 95th, and 99th percentiles. The relationships between rainfall variability and general atmospheric circulation indices for interannual and extreme event variability are moderately influenced by the El Niño-Southern Oscillation and Mediterranean Oscillation. Significant correlations are observed between the Southern Oscillation Index and annual rainfall in the northwestern part of the study area, which is likely linked with the decrease in rainfall in this region. Seasonal rainfall in Northern Algeria is affected by the Mediterranean Oscillation and North Atlantic Oscillation in the west. The ENSEMBLES regional climate models (RCMs) are assessed using the bias method to test their ability to reproduce rainfall variability at different time scales. The Centre National de Recherches Météorologiques (CNRM), Czech Hydrometeorological Institute (CHMI), Eidgenössische Technische Hochschule Zürich (ETHZ), and Forschungszentrum Geesthacht (GKSS) models yield the least biased results.

  10. Intercomparison of Nine National High-vacuum Standards under the Auspices of the Bureau International des Poids et Mesures

    NASA Astrophysics Data System (ADS)

    Messer, G.; Jitschin, W.; Rubet, L.; Calcatelli, A.; Redgrave, F. J.; Keprt, A.; Wei-nan, Fei; Sharma, J. K. N.; Dittmann, S.; Ono, M.

    1989-01-01

    The Bureau International des Poids et Mesures has initiated world-wide intercomparisons of pressure standards. The intercomparison in the regime of very low pressures, i.e. 10-4 to 1 Pa, using Ar as the test gas, has now been completed with the participation of laboratories in nine countries (in alphabetical order): Czechoslovakia, Federal Republic of Germany, France, India, Italy, Japan, People's Republic of China, UK and United States of America. In addition, five of these laboratories made measurements using H2 as the test gas. Four spinning-rotor gauges were employed as transfer standards. The achieved transfer uncertainty between the pilot laboratory (Physikalisch-Technische Bundesanstalt) and a participating laboratory lies between 0.16% and 0.30% (1σ) for Ar and has allowed an intercomparison at this level of accuracy. At all investigated pressures the standards in the various laboratories lie within an interval of +/-3% around the standard of the pilot laboratory. For a brief synopsis of the intercomparison results, the calibration data of each laboratory for one gas species are reduced to a single number, i.e., the average over the pressure range 10-3 to 1 Pa, although this procedure is somewhat arbitrary and obscures scatter and pressure-dependence of some calibration results. These averages deviate from their mean by not more than about 1%. Systematic deviations between some laboratories are clearly identifiable: however, for most of the laboratories it appears that these are compatible with the estimated uncertainties of the pressure generation and the transfer uncertainty.

  11. Metrology of the Solar Spectral Irradiance at the Top Of Atmosphere in the Near Infrared using Ground Based Instruments. Presentation of the PYR-ILIOS campaign (Mauna Loa Observatory, June-July 2016).

    NASA Astrophysics Data System (ADS)

    Cessateur, G.; Bolsée, D.; Pereira, N.; Sperfeld, P.; Pape, S.

    2016-12-01

    The availability of reference spectra for the Solar Spectral Irradiance (SSI) is of the most importance for the solar physics, the studies of planetary atmospheres and climatology. The near infrared (NIR) part of these spectra is of great interest for its main role for example, in the Earth's radiative budget. However, some large and unsolved discrepancies (up to 10 %) are observed in the 1.6 μm region between recent measurements from space instruments and modelling. We developed a ground-based instrumentation dedicated to SSI measurements of the Top Of Atmosphere (TOA), obtained through atmospheric NIR windows using the Bouguer-Langley technique. The instruments are a double spectroradiometer designed by Bentham (UK) and a 6-channels NIR filters radiometer. Both were radiometrically characterized at the Royal Belgian Institute for Space Aeronomy. In the following they were calibrated against a high-temperature blackbody as primary standard for spectral irradiance at the Physikalisch-Technische Bundesanstalt (Germany). The PYR-ILIOS campaign carried out in June to July 2016 at the Mauna Loa Observatory (Hawaii, USA, 3396 m a.s.l.) is a follower of the four-month IRESPERAD campaign which was carried out in 2011 at the Izaña Atmospheric Observatory (Canary Islands, 2367 m a.s.l.). We present here the results of the 3 weeks PYR-ILIOS campaign and compare them with the outcome from IRESPERAD as well as from other ground-based, airborne or space experiments will be presented. The standard uncertainty of the PYR-ILIOS results will be discussed.

  12. The Absolute Solar Irradiance Spectrum at Solar Minimum Activity Measured by the SOLSPEC and SOL-ACES Spectrometers from 17 to 3000 nm Placed on Board the International Space Station

    NASA Astrophysics Data System (ADS)

    Thuillier, Gerard; Bolsee, David; Schmidtke, Gerhard; Schmutz, Werner; Shapiro, Alexander; Nikutowski, Bernd

    Two instruments placed on the COLOMBUS laboratory on the International Space Station constitute a payload named SOLAR measuring the spectral solar irradiance from 17 to 3000 nm for solar, atmospheric and climatology physics for which the sun-climate connection also re-quires the precise and absolute knowledge of the solar spectral irradiance. Given the significant improvements in atmosphere, climate and solar modelling, accurate data are needed. SOL-SPEC primary objectives are the measurement of the Sun absolute spectral irradiance and its variability from 165 to 3080 nm. SOLSPEC has been developed by LATMOS (France), Institut d'Aéronomie Spatiale (Belgique), and Landessternwarte (Germany). It has been calibrated in the absolute scale by using the blackbody of the Physikalisch-Technische Bundesanstalt (PTB), Braunschweig. SOL-ACES primary objectives are the measurements of the Sun absolute spec-tral irradiance from 17 to 140 nm. This instrument as developed by the Fraunhofer Institute (Freiburg, Germany) uses three-current ionisation chambers repeatedly filled with different gases to re-calibrate the three spectrometers, which are changing their efficiencies e.g. by the interaction with solar radiation. We present a composite solar spectrum for the July 2008 period, at a very low solar as occurred at the end of solar cycle 23. It has been built using SOLSPEC, SOL-ACES and TIMED SEE data. Comparison with data obtained during the ATLAS 3 period (November 1994), SORCE measurements and theoretical modelling using the COSI code will be presented. Differences will be commented (difference of the two activity levels, accuracy).

  13. Dynamic registration of an optical see-through HMD into a wide field-of-view rotorcraft flight simulation environment

    NASA Astrophysics Data System (ADS)

    Viertler, Franz; Hajek, Manfred

    2015-05-01

    To overcome the challenge of helicopter flight in degraded visual environments, current research considers headmounted displays with 3D-conformal (scene-linked) visual cues as most promising display technology. For pilot-in-theloop simulations with HMDs, a highly accurate registration of the augmented visual system is required. In rotorcraft flight simulators the outside visual cues are usually provided by a dome projection system, since a wide field-of-view (e.g. horizontally > 200° and vertically > 80°) is required, which can hardly be achieved with collimated viewing systems. But optical see-through HMDs do mostly not have an equivalent focus compared to the distance of the pilot's eye-point position to the curved screen, which is also dependant on head motion. Hence, a dynamic vergence correction has been implemented to avoid binocular disparity. In addition, the parallax error induced by even small translational head motions is corrected with a head-tracking system to be adjusted onto the projected screen. For this purpose, two options are presented. The correction can be achieved by rendering the view with yaw and pitch offset angles dependent on the deviating head position from the design eye-point of the spherical projection system. Furthermore, it can be solved by implementing a dynamic eye-point in the multi-channel projection system for the outside visual cues. Both options have been investigated for the integration of a binocular HMD into the Rotorcraft Simulation Environment (ROSIE) at the Technische Universitaet Muenchen. Pros and cons of both possibilities with regard on integration issues and usability in flight simulations will be discussed.

  14. Final report on the EURAMET.PR-K1.a-2009 comparison of spectral irradiance 250 nm—2500 nm

    NASA Astrophysics Data System (ADS)

    Goodman, Teresa; Servantes, William; Woolliams, Emma; Sperfeld, Peter; Simionescu, Mihai; Blattner, Peter; Källberg, Stefan; Khlevnoy, Boris; Dekker, Paul

    2015-01-01

    This report gives the results of the EURAMET.PR-K1.a-2009 comparison of spectral irradiance over the wavelength range 250 nm—2500 nm. Seven laboratories took part, including the pilot. In general the results are consistent, with a few exceptions as explained in the report. The EURAMET.PR-K1.a key comparison detailed in this report was carried out to establish the degrees of equivalence for the participating European laboratories with respect to the Key Comparison Reference Value (KCRV) of the CCPR-K1.a key comparison. The EURAMET.PR-K1.a key comparison was piloted by the National Physical Laboratory (NPL), who also acted as pilot for the CCPR-K1.a key comparison; a further linkage to the KCRV of the CCPR-K1.a key comparison was provided through the participation of the Physikalisch-Technische Bundesanstalt (PTB) in both comparisons. The other participants were: National Institute of Metrology of Romania (INM-RO), Federal Office of Metrology (METAS), VSL Dutch Metrology Institute (VSL), SP Technical Research Institute of Sweden (SP) and All Russian Institute for Optical and Physical Measurements (VNIIOFI). Measurements were made by each laboratory at 44 designated wavelengths, or a subset of these wavelengths. The link laboratories made measurements at all 44 wavelengths. For the purposes of analysis each wavelength has been treated independently, as for the CCPR K1.a comparison. Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCPR, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

  15. Experimental determination of gravitomagnetic effects by means of ring lasers

    NASA Astrophysics Data System (ADS)

    Tartaglia, Angelo

    2013-08-01

    A new experiment aimed to the detection of the gravito-magnetic Lense-Thirring effect at the surface of the Earth will be presented; the name of the experiment is GINGER. The proposed technique is based on the behavior of light beams in ring-lasers, also known as gyrolasers. A three-dimensional array of ringlasers will be attached to a rigid "monument"; each ring will have a different orientation in space. Within the space-time of a rotating mass the propagation of light is indeed anisotropic; part of the anisotropy is purely kinematical (Sagnac effect), part is due to the interaction between the gravito-electric field of the source and the kinematical motion of the observer (de Sitter effect), finally there is a contribution from the gravito-magnetic component of the Earth (gravito-magnetic frame dragging or Lense-Thirring effect). In a ring-laser a light beam traveling counterclockwise is superposed to another beam traveling in the opposite sense. The anisotropy in the propagation leads to standing waves with slightly different frequencies in the two directions; the final effect is a beat frequency proportional to the size of the instrument and its effective rotation rate in space, including the gravito-magnetic drag. Current laser techniques and the performances of the best existing ring-lasers allow at the moment a sensitivity within one order of magnitude of the required accuracy for the detection of gravito-magnetic effects, so that the objective of GINGER is in the range of feasibility and aims to improve the sensitivity of a couple of orders of magnitude with respect to present. The experiment will be underground, probably in the Gran Sasso National Laboratories in Italy, and is based on an international collaboration among four Italian groups, the Technische Universität München and the University of Canterbury in Christchurch (NZ).

  16. Final report on APMP.M.P-S4: Results of the bilateral supplementary comparison on pressure measurements in the range (60 to 350) kPa of gauge pressure in gas media

    NASA Astrophysics Data System (ADS)

    Priruenrom, T.; Sabuga, W.; Konczak, T.

    2013-01-01

    The bilateral supplementary comparison APMP.M.P-S4 on pressure measurements in the range (60 to 350) kPa of gauge pressure in gas media was organized by National Institute of Metrology of Thailand, NIMT, as the pilot laboratory, comparing with Physikalisch-Technische Bundesanstalt of Germany, PTB. The objective of this comparison is to check equivalence of gas pressure standards between NIMT and PTB. The period of measurement covered November to December 2012. NIMT provided a transfer standard, which was a WC-WC piston-cylinder assembly (PCA) with a nominal effective area of 10 cm2 manufactured by Fluke Corporation, DHI. The measurements were performed at pressures (60, 100, 150, 200, 250, 300 and 350) kPa. The NIMT laboratory standard used was a pressure balance with a PCA of 10 cm2 manufactured by DHI and identified by serial number 0693. The PTB laboratory standard used was a pressure balance with a PCA of 10 cm2 manufactured by Desgranges et Huot (DH) and identified by serial number 288. The results of this comparison show that the relative difference of the effective area values obtained by NIMT and PTB is not larger than 4.3 ppm, which corresponds to En = 0.26. Therefore, it confirms that the gas pressure standards maintained by the two institutes, NIMT and PTB, in the pressure range (60 to 350) kPa in gauge mode are equivalent under their uncertainties claimed. The result of this comparison is essential to support the calibration and measurement capabilities (CMC) of NIMT in this pressure range. Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the APMP, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

  17. Electronic Structure and Morphology of Graphene Layers on SiC

    NASA Astrophysics Data System (ADS)

    Ohta, Taisuke

    2008-03-01

    Recent years have witnessed the discovery and the unique electronic properties of graphene, a sheet of carbon atoms arranged in a honeycomb lattice. The unique linear dispersion relation of charge carriers near the Fermi level (``Dirac Fermions'') lead to exciting transport properties, such as an unusual quantum Hall effect, and have aroused scientific and technological interests. On the way towards graphene-based electronics, a knowledge of the electronic band structure and the morphology of epitaxial graphene films on silicon carbide substrates is imperative. We have studied the evolution of the occupied band structure and the morphology of graphene layers on silicon carbide by systematically increasing the layer thickness. Using angle-resolved photoemission spectroscopy (ARPES), we examine this unique 2D system in its development from single layer to multilayers, by characteristic changes in the π band, the highest occupied state, and the dispersion relation in the out-of-plane electron wave vector in particular. The evolution of the film morphology is evaluated by the combination of low-energy electron microscopy and ARPES. By exploiting the sensitivity of graphene's electronic states to the charge carrier concentration, changes in the on-site Coulomb potential leading to a change of π and π* bands can be examined using ARPES. We demonstrate that, in a graphene bilayer, the gap between π and π* bands can be controlled by selectively adjusting relative carrier concentrations, which suggests a possible application of the graphene bilayer for switching functions in electronic devices. This work was done in collaboration with A. Bostwick, J. L. McChesney, and E. Rotenberg at Advanced Light Source, Lawrence Berkeley National Laboratory, K. Horn at Fritz-Haber-Institut, K. V. Emtsev and Th. Seyller at Lehrstuhl für Technische Physik, Universität Erlangen-Nürnberg, and F. El Gabaly and A. K. Schmid at National Center for Electron Microscopy, Lawrence Berkeley

  18. Neutron field measurements of the CRNA OB26 irradiator using a Bonner sphere spectrometer for radiation protection purposes.

    PubMed

    Mazrou, H; Allab, M

    2012-08-01

    The present work deals with the Bonner sphere spectrometer (BSS) measurements performed, to support the authors' Monte-Carlo calculations, to estimate accurately the main characteristics of the neutron field of the (241)Am-Be-based OB26 irradiator acquired for radiation protection purposes by the Nuclear Research Centre of Algiers. The measurements were performed at a reference irradiation position selected at 150 cm from the geometrical centre of the neutron source. The spectrometric system in use is based on a central spherical (3)He thermal neutron proportional counter. The response matrix of the present spectrometer has been taken to be similar to the original Physikalisch-Technische Bundesanstalt (PTB) (Braunschweig, Germany) BSS's response matrix, with a five bins per decade energy group structure, as there is no significant difference in the BSS's physical characteristics. Thereafter, the authors' BSS measurements were used together with MCNP5 results to unfold the neutron spectrum by means of MAXED and GRAVEL computer codes from the U.M.G. 3.3 package, developed at PTB. Besides, sensitivity analysis has been performed to test the consistency of the unfolding procedure. It reveals that no significant discrepancy was observed in the total neutron fluence and total ambient dose values following the perturbation of some pertinent unfolding parameters except for the case where a 10 bins energy structure was assumed for the guess spectrum. In this latter case, a 5 % difference was observed in the ambient dose equivalent compared with the reference case. Finally, a comparative study performed between different counting systems together with MCNP5 and predictive formulas results shows that they were globally satisfactory, highlighting thereby the relevance of the unfolding procedure and the reliability of the obtained results.

  19. KEY COMPARISON: CCQM-K12: The determination of creatinine in serum

    NASA Astrophysics Data System (ADS)

    Welch, Michael J.; Phinney, Curtis P.; Parris, Reenie M.; May, Willie E.; Heo, Gwi Suk; Henrion, Andre; O'Conner, Gavin; Schimmel, Heinz

    2003-01-01

    A Key Comparison on the determination of creatinine in human serum organized by the Consultative Committee on Amount of Substance (CCQM) was carried out in 2001. To address the measurement traceability needs of the clinical chemistry community, the CCQM is undertaking Key Comparisons to document the capabilities of national metrology institutes (NMIs) that provide measurement services in this area. This Key Comparison, along with two others recently completed, CCQM-K6 and CCQM-K11, determination of total cholesterol and glucose, respectively, in serum, will provide a basis for evaluating the capabilities of NMIs for the determination of well-defined, organic substances of similar molecular weights and concentrations in human serum. Participants in CCQM-K12 included: National Institute of Standards and Technology (NIST) [USA], Coordinating Laboratory; Institute for Reference Materials and Measurements (IRMM) [EU]; Korea Research Institute of Standards and Science (KRISS) [S Korea]; Laboratory of the Government Chemist, (LGC) [UK]; and Physikalisch-Technische Bundesanstalt (PTB) [Germany]. Two frozen human serum materials were analyzed by each of the participants using either ID-GC/MS-based methods (three laboratories) or ID-LC/MS-based methods (two laboratories). Agreement of results among the participants was excellent, in accordance with the agreement found in a pilot study (CCQM-P9) for creatinine in serum. The resulting Key Comparison Reference Values had expanded uncertainties of less than 1% for both materials. In conclusion, five NMIs have demonstrated their ability to make reference measurements of creatinine in serum using isotope dilution-based methods that, when executed properly, provide measurements that are precise, accurate and SI traceable. Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer

  20. KEY COMPARISON: CCQM-K11: The determination of glucose in serum

    NASA Astrophysics Data System (ADS)

    Welch, Michael J.; Sniegoski, Lorna T.; Parris, Reenie M.; May, Willie E.; Heo, Gwi Suk; Henrion, Andre

    2003-01-01

    A Key Comparison on the determination of glucose in human serum organized by the Consultative Committee on Amount of Substance (CCQM) was carried out in 2001. To address the measurement traceability needs of the clinical chemistry community, the CCQM is undertaking Key Comparisons to document the capabilities of national metrology institutes (NMIs) that provide measurement services in this area. This Key Comparison, along with two others recently completed, CCQM-K6 and CCQM-K12, determination of total cholesterol and creatinine, respectively, in serum, will provide a basis for evaluating the capabilities of NMIs for the determination of well-defined, organic substances of similar molecular weights and concentrations in human serum. Participants in CCQM-K11 included: National Institute of Standards and Technology (NIST) [USA], Coordinating Laboratory; Korea Research Institute of Standards and Science (KRISS) [S Korea]; and Physikalisch-Technische Bundesanstalt (PTB) [Germany]. A frozen human serum material was analysed by each of the participants using ID-GC/MS-based methods. Agreement of results among the participants was good, with a relative range of <1%, yielding a Key Comparison Reference Value of 0.7762 +/- 0.0088 mg/g. These results were in accordance with the good agreement found for two serum materials in a pilot study (CCQM-P8) involving the same participants. In conclusion, three NMIs have demonstrated their ability to make reference measurements of glucose in serum using isotope dilution-based methods that, when executed properly, provide measurements that are precise, accurate and SI traceable. Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCQM, according to the provisions of the Mutual Recognition Arrangement (MRA).

  1. Relative response of alanine dosemeters for high-energy electrons determined using a Fricke primary standard.

    PubMed

    Vörös, Sándor; Anton, Mathias; Boillat, Bénédicte

    2012-03-07

    A significant proportion of cancer patients is treated using MeV electron radiation. One of the measurement methods which is likely to furnish reliable dose values also under non-reference conditions is the dosimetry using alanine and read-out via electron spin resonance (ESR). The system has already proven to be suitable for QA purposes for modern radiotherapy involving megavoltage x-rays. In order to render the secondary standard measurement system of the Physikalisch-Technische Bundesanstalt based on alanine/ESR useable for dosimetry in radiotherapy, the dose-to-water (D(W)) response of the dosemeter needs to be known for relevant radiation qualities. For MeV electrons, the D(W) response was determined using the Fricke primary standard of the Swiss Federal Office of Metrology. Since there were no citable detailed publications on the Swiss primary standard available, this measurement system is described in some detail. The experimental results for the D(W) response are compared to results of Monte Carlo simulations which model in detail the beams furnished by the electron accelerator as well as the geometry of the detectors. The agreement between experiment and simulation is very good, as well as the agreement with results published by the National Research Council of Canada which are based on a different primary standard. No significant dependence of the D(W) response was found in the range between 6 and 20 MeV. It is therefore suggested to use a unique correction factor k(E) for alanine for all MeV qualities of k(E) = 1.012 ± 0.010.

  2. [Helsinki declaration on patient safety in anaesthesiology -part 10: infection control/hygiene].

    PubMed

    Kerwat, Klaus; Wulf, Hinnerk

    2013-11-01

    There is a plethora of laws, regulations, guidelines and recommendations relating to infection control and hygiene. Major issues are the prevention of nosocomial infections, staff protection and environmental protection. Of the highest relevance are the infection control law [Infektionsschutzgesetz (IfSG)], the hygiene regulations of the German federal states [Hygieneverordnungen der Bundesländer], the German technical rules for biological materials [Technische Regel Biologische Arbeitsstoffe 250 (TRBA 250)] - biological materials in health-care and welfare work [Biologische Arbeitsstoffe im Gesundheitswesen und in der Wohlfahrtspflege], the guidelines for hospital hygiene and prevention of infection of the commission for hospital hygiene and prevention of infection of the Robert-Koch Institute [Richtlinie für Krankenhaushygiene und Infektionsprävention von der Kommission für Krankenhaushygiene und Infektionsprävention (KRINKO) beim Robert Koch-Institut], the recommendations of the commission on anti-infectives, resistance and therapy of the Robert-Koch Institute [Empfehlungen der Kommission Antiinfektiva, Resistenz und Therapie (ART) beim Robert Koch-Institut]. Of subordinate importance are, e.g., the recommendations of the German Society for Anesthesiology and Intensive Medicine (DGAI). It is practically impossible for an anesthesiologist working in a hospital to have knowledge of all laws, regulations, guidelines and recommendations. And this is also not reasonable. Thus it is necessary to distinguish the relevant from the irrelevant. Checklists can be useful here. The most important and effective individual action in hospital hygiene is and remains hand hygiene as is propagated in the action "clean hands", irrespective of all laws, regulations, guidelines and recommendations.

  3. Oral but not written test anxiety is related to social anxiety

    PubMed Central

    Laurin-Barantke, Lisa; Hoyer, Jürgen; Fehm, Lydia; Knappe, Susanne

    2016-01-01

    AIM To examine the associations of test anxiety (TA) in written vs oral exam situations with social anxiety (SA). METHODS A convenience sample of 204 students was recruited at the Technische Universität Dresden (TU Dresden, Germany) and contacted via e-mail asking to complete a cross-sectional online survey based on established questionnaires. The study protocol was approved by the ethics committee of the TU Dresden. Full data of n = 96 students were available for dependent t-tests and correlation analyses on the associations of SA and TA respectively with trigger events, cognitions, safety behaviors, physical symptoms and depersonalization. Analyses were run using SPSS. RESULTS Levels of TA were higher for fear in oral exams than for fear in written exams (M = 48.1, SD = 11.5 vs M = 43.7, SD = 10.1 P < 0.001). Oral TA and SA were positively correlated (Spearman’s r = 0.343, P < 0.001; Pearson’s r = 0.38, P < 0.001) contrasting written TA and SA (Spearman’s r = 0.17, P > 0.05; Pearson’s r = 0.223, P > 0.05). Compared to written TA, trigger events were more often reported for oral TA (18.2% vs 30.3%, P = 0.007); which was also accompanied more often by test-anxious cognitions (7.9% vs 8.5%, P = 0.001), safety behavior (8.9% vs 10.3%, P < 0.001) and physical symptoms (for all, P < 0.001). CONCLUSION Written, but not oral TA emerged being unrelated to SA and may rather not be considered as a typical facet of SA disorder. PMID:27679775

  4. First international comparison of fountain primary frequency standards via a long distance optical fiber link

    NASA Astrophysics Data System (ADS)

    Guéna, J.; Weyers, S.; Abgrall, M.; Grebing, C.; Gerginov, V.; Rosenbusch, P.; Bize, S.; Lipphardt, B.; Denker, H.; Quintin, N.; Raupach, S. M. F.; Nicolodi, D.; Stefani, F.; Chiodo, N.; Koke, S.; Kuhl, A.; Wiotte, F.; Meynadier, F.; Camisard, E.; Chardonnet, C.; Le Coq, Y.; Lours, M.; Santarelli, G.; Amy-Klein, A.; Le Targat, R.; Lopez, O.; Pottie, P. E.; Grosche, G.

    2017-06-01

    We report on the first comparison of distant caesium fountain primary frequency standards (PFSs) via an optical fiber link. The 1415 km long optical link connects two PFSs at LNE-SYRTE (Laboratoire National de métrologie et d’Essais—SYstème de Références Temps-Espace) in Paris (France) with two at PTB (Physikalisch-Technische Bundesanstalt) in Braunschweig (Germany). For a long time, these PFSs have been major contributors to accuracy of the International Atomic Time (TAI), with stated accuracies of around 3× {{10}-16} . They have also been the references for a number of absolute measurements of clock transition frequencies in various optical frequency standards in view of a future redefinition of the second. The phase coherent optical frequency transfer via a stabilized telecom fiber link enables far better resolution than any other means of frequency transfer based on satellite links. The agreement for each pair of distant fountains compared is well within the combined uncertainty of a few 10-16 for all the comparisons, which fully supports the stated PFSs’ uncertainties. The comparison also includes a rubidium fountain frequency standard participating in the steering of TAI and enables a new absolute determination of the 87Rb ground state hyperfine transition frequency with an uncertainty of 3.1× {{10}-16} . This paper is dedicated to the memory of André Clairon, who passed away on 24 December 2015, for his pioneering and long-lasting efforts in atomic fountains. He also pioneered optical links from as early as 1997.

  5. Dose measurements in pulsed radiation fields with commercially available measuring components.

    PubMed

    Friedrich, Sabrina; Hupe, Oliver

    2016-03-01

    Dose measurements in pulsed radiation fields with dosemeters using the counting technique are known to be inappropriate. Therefore, there is a demand for a portable device able to measure the dose in pulsed radiation fields. As a detector, ionisation chambers seem to be a good alternative. In particular, using a secondary standard ionisation chamber in combination with a reliable charge-measuring system would be a good solution. The Physikalisch-Technische Bundesanstalt (PTB) uses secondary standard ionisation chambers in combination with PTB-made measuring electronics for dose measurements at its reference fields. However, for general use, this equipment is too complex. For measurements on-site, a mobile special electronic system [Hupe, O. and Ankerhold, U. Determination of ambient and personal dose equivalent for personnel and cargo security screening. Radiat. Prot. Dosim. 121: (4), 429-437 (2006)] has been used successfully. Still, for general use, there is a need for a much simpler but a just as good solution. A measuring instrument with very good energy dependence for H*(10) is the secondary standard ionisation chamber HS01. An easy-to-use and commercially available electrometer for measuring the generated charges is the UNIDOS by PTW Freiburg. Depending on the expected dose values, the ionisation chamber used can be selected. In addition, measurements have been performed by using commercially available area dosemeters, e.g. the Mini SmartION 2120S by Thermo Scientific, using an ionisation chamber and the Szintomat 6134 A/H by Automess, using a scintillation detector. © The Author 2015. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oup.com.

  6. Modeling and simulation of a GOX/kerosene subscale rocket combustion chamber with film cooling

    NASA Astrophysics Data System (ADS)

    Höglauer, C.; Kniesner, B.; Knab, O.; Schlieben, G.; Kirchberger, C.; Silvestri, S.; Haidn, O. J.

    2015-12-01

    Detailed knowledge on the heat transfer mechanisms is crucial for the design of reliable and efficient rocket engines. Due to the high heat loads of the combustion chamber walls and the corrosive hot gases, film cooling is often applied supplementary or even as a primary cooling technique. Nevertheless, the dominating processes determining the film effectiveness under the conditions representative for rocket combustors are still not fully understood. In context of the national research program Transregio SFB/TRR-40, TEKAN and TARES, the Institute for Flight Propulsion (LFA) of the Technische Universität München (TUM) and Airbus Defence and Space carry out experimental and numerical investigations on heat transfer and film cooling techniques at application-relevant combustion pressures and temperatures. In this paper, results from film cooling experiments and numerical simulations with liquid and transcritical kerosene films in a water-cooled GOX/kerosene rocket combustion chamber are presented. The tests have been performed at two different combustion chamber pressures and with two different throat diameters to study the influence of Reynolds and Mach number. In the numerical investigations, a major issue has been the modeling of kerosene films in sub- and transcritical state. For the modeling Airbus Defence and Space's in-house tool, Rocflam-II has been applied. The main goal of Rocflam-II is to provide a tool package for the simulation of a wide range of rocket combustion devices, validated against experimental data. This includes the modeling of propellant injection, atomization, mixing, combustion, wall heat transfer, film modeling as well as the conjugate heat transfer into the chamber wall and the cooling channels.

  7. Evidence for a Solar Influence on Gamma Radiation from Radon

    NASA Astrophysics Data System (ADS)

    Sturrock, P. A.; Steinitz, G.; Fischbach, E.; Javorsek, D.; Jenkins, J.

    2012-12-01

    We have analyzed 29,000 measurements of gamma radiation associated with the decay of radon confined to an airtight vessel at the Geological Survey of Israel (GSI) Laboratory in Jerusalem between January 28 2007 and May 10 2010. These measurements exhibit strong variations in time of year and time of day, which may be due in part to environmental influences. However, time-series analysis reveals a number of strong periodicities, including two at approximately 11.2 year-1 and 12.5 year-1. We consider it significant that these same oscillations have previously been detected in nuclear-decay data acquired at the Brookhaven National Laboratory and at the Physiklisch-Technische Bundesanstalt. We have suggested that these oscillations are due to some form of solar radiation (possibly neutrinos) that has its origin in the deep solar interior. A curious property of the GSI data is that the annual oscillation is much stronger in daytime data than in nighttime data, but the opposite is true for all other oscillations. Time-frequency analysis also yields quite different results from daytime and nighttime data. These procedures have also been applied to data collected from subsurface geological sites in Israel, Tenerife, and Italy, which have a variety of geological and geophysical scenarios, different elevations, and depths below the surface ranging from several meters to 1000 meters. In view of these results, and in view of the fact that there is at present no clear understanding of the behavior of radon in its natural environment, there would appear to be a need for multi-disciplinary research. Investigations that clarify the nature and mechanisms of solar influences may help clarify the nature and mechanisms of geological influences.

  8. Analysis of Radon Decay Data and its Implications for Physics, Geophysics, and Solar Physics.

    NASA Astrophysics Data System (ADS)

    Sturrock, Peter A.; Fischbach, E.; Jenkins, J. H.; Steinitz, G.

    2012-05-01

    We present an analysis of about 29,000 measurements of gamma radiation associated with the decay of radon in a sealed container at the Geological Survey of Israel (GSI) Laboratory in Jerusalem between January 28 2007 and May 10 2010. These measurements exhibit strong variations in time of year and time of day, which may be due in part to environmental influences. However, time-series analysis also reveals a number of periodicities, notably at 11.2 year-1 and 12.5 year-1, which we have found in other nuclear-decay data --including data acquired at the Brookhaven National Laboratory and the Physiklisch-Technische Bundesanstalt-- which we attribute to a solar influence. A distinct property of the GSI results is that the annual oscillation is much stronger in daytime data than in nighttime data, but the opposite is true for all other oscillations. We speculate on possible interpretations of this curious result. Solar neutrinos remain our prime suspect as the agent responsible for beta-decay anomalies. These results have implications for physics (that nuclear decay rates are not constant and may be stimulated); for geophysics (that the variability of radon measurements cannot be ascribed entirely to atmospheric and solid-earth processes); and for solar physics (that the Sun contains an inner tachocline, separating a slowly rotating core from the radiative zone, which has properties similar to those of the outer tachocline separating the radiative zone from the convection zone). This work was supported by DOE grant DE-AC-02-76ER071428.

  9. Early testing of a coarse/fine precision motion control system

    SciTech Connect

    Buice, E S; Yang, H; Smith, S T; Hocken, R J; Seugling, R M; Trumper, D L; Otten, D

    2005-08-01

    This abstract presents a brief overview of key components of a motion control stage for accurate nanometer level positioning for scanning specimens over an area measuring 50 mm x 50 mm. The completed system will utilize a short-range, third generation 6 degree-of-freedom fine motion control platform (4 microns, 160 micro-radians) carried by a long-range, two-axis x-y positioning system (50 mm x 50 mm). Motion of the controlled platform relative to a measurement frame will be measured using a heterodyne laser interferometer and capacitance sensing. The final stage will be mounted onto an isolation table in a vacuum chamber, itself on isolation supports mounted to a granite slab on bed rock and isolated from the main floor of the building. This whole system is housed in a temperature-controlled laboratory. It is envisaged that the current system will provide the ability to ''pick and place'' at nanometer levels and be used for long range scanning of specimens (including biological specimens), micro- /macroassembly, lithography and as a coordinate measuring machine (CMM). Furthermore, the system performance will be compared with other comparable systems at international locations such as, National Physical Laboratory (NPL) in the UK, Technical University of Eindhoven (TUE) in the Netherlands, Physikalisch-Technische Bundesanstalt (PTB) in Germany, and our own sub-atomic measuring machine (SAMM) [1, 2] at UNC-Charlotte. Critical requirements of the system are as follows: (1) Vacuum compatible to better than 20 mPa; (2) Range of 50 mm x 50 mm x 4 microns; (3) Maximum translation velocity of 5 mm {center_dot} s{sup -1}; (4) Sub-nanometer resolution; and (5) System accuracy of better than 10 nm.

  10. Absolute Radiometric Calibration of EUNIS-06

    NASA Technical Reports Server (NTRS)

    Thomas, R. J.; Rabin, D. M.; Kent, B. J.; Paustian, W.

    2007-01-01

    The Extreme-Ultraviolet Normal-Incidence Spectrometer (EUNIS) is a soundingrocket payload that obtains imaged high-resolution spectra of individual solar features, providing information about the Sun's corona and upper transition region. Shortly after its successful initial flight last year, a complete end-to-end calibration was carried out to determine the instrument's absolute radiometric response over its Longwave bandpass of 300 - 370A. The measurements were done at the Rutherford-Appleton Laboratory (RAL) in England, using the same vacuum facility and EUV radiation source used in the pre-flight calibrations of both SOHO/CDS and Hinode/EIS, as well as in three post-flight calibrations of our SERTS sounding rocket payload, the precursor to EUNIS. The unique radiation source provided by the Physikalisch-Technische Bundesanstalt (PTB) had been calibrated to an absolute accuracy of 7% (l-sigma) at 12 wavelengths covering our bandpass directly against the Berlin electron storage ring BESSY, which is itself a primary radiometric source standard. Scans of the EUNIS aperture were made to determine the instrument's absolute spectral sensitivity to +- 25%, considering all sources of error, and demonstrate that EUNIS-06 was the most sensitive solar E W spectrometer yet flown. The results will be matched against prior calibrations which relied on combining measurements of individual optical components, and on comparisons with theoretically predicted 'insensitive' line ratios. Coordinated observations were made during the EUNIS-06 flight by SOHO/CDS and EIT that will allow re-calibrations of those instruments as well. In addition, future EUNIS flights will provide similar calibration updates for TRACE, Hinode/EIS, and STEREO/SECCHI/EUVI.

  11. Development of a 3D-AFM for true 3D measurements of nanostructures

    NASA Astrophysics Data System (ADS)

    Dai, Gaoliang; Häßler-Grohne, Wolfgang; Hüser, Dorothee; Wolff, Helmut; Danzebrink, Hans-Ulrich; Koenders, Ludger; Bosse, Harald

    2011-09-01

    The development of advanced lithography requires highly accurate 3D metrology methods for small line structures of both wafers and photomasks. Development of a new 3D atomic force microscopy (3D-AFM) with vertical and torsional oscillation modes is introduced in this paper. In its configuration, the AFM probe is oscillated using two piezo actuators driven at vertical and torsional resonance frequencies of the cantilever. In such a way, the AFM tip can probe the surface with a vertical and a lateral oscillation, offering high 3D probing sensitivity. In addition, a so-called vector approach probing (VAP) method has been applied. The sample is measured point-by-point using this method. At each probing point, the tip is approached towards the surface until the desired tip-sample interaction is detected and then immediately withdrawn from the surface. Compared to conventional AFMs, where the tip is kept continuously in interaction with the surface, the tip-sample interaction time using the VAP method is greatly reduced and consequently the tip wear is reduced. Preliminary experimental results show promising performance of the developed system. A measurement of a line structure of 800 nm height employing a super sharp AFM tip could be performed with a repeatability of its 3D profiles of better than 1 nm (p-v). A line structure of a Physikalisch-Technische Bundesanstalt photomask with a nominal width of 300 nm has been measured using a flared tip AFM probe. The repeatability of the middle CD values reaches 0.28 nm (1σ). A long-term stability investigation shows that the 3D-AFM has a high stability of better than 1 nm within 197 measurements taken over 30 h, which also confirms the very low tip wear.

  12. New developments at PTB in 3D-AFM with tapping and torsion AFM mode and vector approach probing strategy

    NASA Astrophysics Data System (ADS)

    Dai, G.; Hässler-Grohne, W.; Hüser, D.; Wolff, H.; Fluegge, J.; Bosse, H.

    2011-06-01

    A new 3D-AFM for true 3D measurements of nano structures has been developed at Physikalisch Technische-Bundesanstalt, the national metrology institute of Germany. In its configuration, two piezo actuators are applied to drive the AFM cantilever near its vertical and torsional resonant frequencies. In such a way, the AFM tip can probe the surface with a vertical and/or a lateral oscillation, offering high 3D probing sensitivity. For enhancing measurement flexibility as well as reducing tip wear, a so called "vector approach probing" (VAP) method has been applied. The sample is measured point by point using this method. At each probing point, the tip is approached towards the surface in its normal direction until the desired tip-sample interaction is detected and then immediately withdrawn from the surface. Preliminary experimental results show promising performance of the developed system. The measurement of a line structure of 800 nm height employing a super sharp AFM tip is performed, showing a repeatability of its 3D profiles of better than 1 nm (p-v). A single crystal critical dimension reference material (SCCDRM) having features with almost vertical sidewall is measured using a flared AFM tip. Results show that the feature has averaged left and right sidewall angles of 88.64° and 88.67deg;, respectively. However, the feature width non-uniformity may reach 10 nm within the measurement range of 1 μm. The standard deviation of the averaged middle CD values of 7 repeated measurements reaches 0.35 nm. In addition, an investigation of long term measurement stability is performed on a PTB photomask. The results shows that the 3D-AFM has a drift rate of about 0.00033 nm per line, which confirms the high measurement stability and the very low tip wear.

  13. Werner Ernst Reichardt Ph.D: founder of modern computational visual neurophysiology and anti-Nazi resistance fighter.

    PubMed

    Flynn, J T

    1999-01-01

    Werner Ernst Reichardt was born on January 30, 1924 in Berlin and at age 19 was drafted into the Luftwaffe and assigned to an electronic signals section laboratory. He became an active member of a resistance group and supplied radios for the movement in Germany. He emerged from the ashes of the Second World War and dedicated his scientific life to the development of the newborn specialty of biological physics. Following graduation from the Technische Hochschule Charlottenburg, he did a fellowship at CalTech under Max Delbrück. On returning to Germany he joined the Max Planck Institut and later became Director of the Max Planck Institut für Biologische Kybernetik in Tübingen, West Germany. Reichardt was one of the founders of the quantitative study of visually controlled orientation in animals. His work is very nearly unique in its close dialectic between elegant non-linear mathematical theory and quantitative experimental test of their predictions. During the 1950s Reichardt and his collaborators jointly developed an autocorrelation model (i.e. the firing rate of the involved visual neurones is closely correlated with the features of the pattern stimulating them) of how moving patterns are perceived by motion detectors in the visual system of the fly. This was the first mathematical description of a biological abstraction process. His findings apply to vertebrate vision, including motion detection and figure-ground description in human vision. His Max Planck Institute became a world renowned center for the computational approach to information processing by the nervous system. At his retirement party from the Institute he founded, Reichardt died on the evening of September 11th, 1992.

  14. Progress Report on the Cooperation Between NMIJ and PTB on Zinc Point Cells

    NASA Astrophysics Data System (ADS)

    Widiatmo, J. V.; Rudtsch, S.; Yamazawa, K.

    2017-05-01

    The National Metrology Institute of Japan (NMIJ) and Physikalisch-Technische Bundesanstalt (PTB) have agreed to conduct a collaborative study on zinc point cells. An open-type zinc cell was prepared to act as a transfer cell in this collaboration, and cells were prepared for both institutes to perform experiments using a common cell during the collaboration. The experiments reflect concerns that both institutes have been studying independently over the past several years using an open-type cell. The concerns include the impurity effect, stability of the realized temperature, and the difference in the heat flux due to a change in the filling gas. A part of the zinc sample extracted during the fabrication of this cell was analyzed, and for the purpose of confirmation, the initial sample taken from the same lot as that used in the transfer cell was also analyzed. The stability of the transfer was evaluated from cell comparisons performed by NMIJ before and after the air transportation between PTB and NMIJ. PTB and NMIJ demonstrated an increase in temperature at the zinc point due to a change in the filling gas from argon to helium. The improvement using helium gas was found strongly to depend on the construction of the cell and the fixed-point furnace design. The analysis of the zinc sample confirmed a strong inhomogeneity of Pb and a contamination by some elements. Careful analysis for estimating the impurity effect on the temperature realized using the transfer cell was also conducted based on the latest studies to avoid an improper application of fixed-point correction.

  15. 1550 nm VCSEL-based 0.48 Tb/s transmission scheme employing PAM-4 and WDM for active optical cables

    NASA Astrophysics Data System (ADS)

    Markou, S.; Dris, S.; Kalavrouziotis, D.; Avramopoulos, H.; Pleros, N.; Tsiokos, Dimitris M.

    2014-05-01

    With this paper we investigate the system-level performance of VCSELs, parameterized with true experimental LI-VI data and dynamic characteristics of state-of-the-art VCSELs with 3 dB modulation bandwidth at 15 GHz, and propose their deployment as high-speed multi-level optical sources in a mid-range active optical cable (AOC) model for performance prediction of a rack-to-rack interconnection. The AOC architecture combines a 6-element 1550 nm VCSEL array, each directly modulated with 40 Gbaud PAM-4 data, with a wavelength division multiplexer (WDM), in order to implement a parallel link with aggregate traffic of 0.48 Tb/s. Transmission reach exceeded 300 m by deploying a two-tap feed forward equalizer filter at the electrical VCSEL driver. Bit Error Rate (BER) measurements and analysis were carried out in MATLAB. In practice, the thermal behavior and basic operational characteristics of the VCSELs fabricated by the Technische Universität München (TUM) were used to study the thermal performance and operational range of the complete AOC model. The VCSELs were initially operated at 20°C and BER measurements showed power penalties of 1.7 dB and 3.5 dB at 300 m and 500 m of transmission distance respectively for all 6 data channels. System performance was also investigated for elevated operating temperatures of the VCSEL module and the additional system degradation and BER penalties introduced by operation at 50°C and 65°C were also investigated for transmission distances of 300 m and 500 m.

  16. Compact field programmable gate array (FPGA)-based multi-axial interferometer for simultaneous tilt and distance measurement in the sub-nanometre range

    NASA Astrophysics Data System (ADS)

    Strube, Sebastian; Molnar, Gabor; Danzebrink, Hans-Ulrich

    2011-09-01

    Quantitative determination of microstructure and nanostructure properties is essential in research, development and in control of the production process. In instruments for dimensional nanometrology the positioning stage is the key component, since the characteristics of the position acquisition and control determine directly the achievable precision of the complete system. Compact commercial positioning systems usually employ capacitive or inductive position sensors. Both technologies not only offer a resolution in the nanometre range, but also require a (periodic) calibration. To achieve traceable measurements, interferometric sensors need to be implemented into the metrology system. However, currently available commercial interferometers turned out to be too large to be installed in miniature positioning stages easily. Therefore, a new highly compact interferometer to allow for traceability and an uncertainty in the Ångstrom range was developed. One of its first applications will be the new metrological low-noise atomic force microscope at the Physikalisch-Technische Bundesanstalt. The new interferometer is based on a modified homodyne Twyman-Green interferometer concept. It uses a novel signal processing approach based on a field programmable gate array, whereby a spatial interferogram is acquired by a high-speed CMOS line sensor and transformed into its frequency spectrum through a discrete Fourier transform. The spectral representation is analyzed for its major components; the phase information bears a direct connection to the displacement of the positioning unit. Furthermore, a possible stage tilt during the scan gives rise to a shift of the peak magnitude in the frequency spectrum. In addition, the developed system proved to be easily extendable to multiple axes by superimposing multiple interferograms on a single line sensor.

  17. Quantitative comparison between PGNAA measurements and MCNP calculations in view of the characterization of radioactive wastes in Germany and France

    NASA Astrophysics Data System (ADS)

    Mauerhofer, E.; Havenith, A.; Carasco, C.; Payan, E.; Kettler, J.; Ma, J. L.; Perot, B.

    2013-04-01

    The Forschungszentrum Jülich GmbH (FZJ), together with the Aachen University Rheinisch-Westfaelische Technische Hochschule (RWTH) and the French Alternative Energies and Atomic Energy Commission (CEA Cadarache) are involved in a cooperation aiming at characterizing toxic and reactive elements in radioactive waste packages by means of Prompt Gamma Neutron Activation Analysis (PGNAA) [1]. The French and German waste management agencies have indeed defined acceptability limits concerning these elements in view of their projected geological repositories. A first measurement campaign was performed in the new Prompt Gamma Neutron Activation Analysis (PGNAA) facility called MEDINA, at FZJ, to assess the capture gamma-ray signatures of some elements of interest in large samples up to waste drums with a volume of 200 liter. MEDINA is the acronym for Multi Element Detection based on Instrumental Neutron Activation. This paper presents MCNP calculations of the MEDINA facility and quantitative comparison between measurement and simulation. Passive gamma-ray spectra acquired with a high purity germanium detector and calibration sources are used to qualify the numerical model of the crystal. Active PGNAA spectra of a sodium chloride sample measured with MEDINA then allow for qualifying the global numerical model of the measurement cell. Chlorine indeed constitutes a usual reference with reliable capture gamma-ray production data. The goal is to characterize the entire simulation protocol (geometrical model, nuclear data, and postprocessing tools) which will be used for current measurement interpretation, extrapolation of the performances to other types of waste packages or other applications, as well as for the study of future PGNAA facilities.

  18. Validated ultrasonic power measurements up to 20 W.

    PubMed

    Hekkenberg, R T; Beissner, K; Zeqiri, B; Bezemer, R A; Hodnett, M

    2001-03-01

    A project has been completed to develop reference methods for the measurement of ultrasonic power with a validated measurement uncertainty of < 7% at power levels of 1 to 20 W over the frequency range 1 to 3 MHz of collimated beams. The project is the result of collaborative research between the Physikalisch-Technische Bundesanstalt, Germany (PTB, DE), the National Physical Laboratory, UK (NPL, UK) and the Netherlands Organisation for Applied Scientific Research, Prevention and Health (TNO-PG, NL). The work has been undertaken under the 4th Framework Programme of the European Community (EC). Primary standard designs of radiation force balances based on both absorbing and reflecting targets have been constructed. To avoid heating effects, the measurements should be done relatively quickly (10 to 20 s). The methods have been validated using ultrasound (US) transducers that demonstrated an adequate short and long-term stability; a method to detect cavitation based on monitoring the acoustic signals produced by bubble oscillation and collapse has been confirmed. It has been shown that only the detection of the subharmonic can be used in practice as cavitation detector. Different procedures for obtaining degassed water have been investigated. A method showing significant promise to be used in a clinical or manufacturer's environment involves the addition of sodium sulphite (Na2SO3). During the validation process, commercially available radiation force balances and ultrasonic physiotherapy devices have also been evaluated. Limitations of current measurement methods and practices, including power measurements made on transducers exhibiting a diverging beam, have been identified. It has been shown that a reflecting target is not appropriate to measure powers of transducers with a ka-value < 30. Based on beam shape and target distance, it has been shown also that proper power measurements using a 45 degrees convex-conical reflecting target can never be performed for

  19. The BNM-LPTF software for the frequency comparison of atomic clocks by the carrier phase of the GPS signal.

    PubMed

    Taris, F; Uhrich, P; Petit, G; Jiang, Z; Barillet, R; Hamouda, F

    2000-01-01

    This paper describes the software and equipment used at the Laboratoire Primaire du Temps et des Frequences du Bureau National de Metrologie (BNM-LPTF), Paris, France. Two H-masers in short baseline, one located at the BNM-LPTF and the other at the Laboratoire de l'Horloge Atomique du Centre National de la Recherche Scientifique (CNRS-LHA), Orsay, France, were computed in parallel with the BNM-LPTF software and with the BERNESE V 4.1 software. The comparison of the results issued from both computations shows an agreement within 100 ps (1 sigma). In addition, comparisons with the BNM-LPTF software were made over 10 days with the H-masers located at the Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany, and another at the National Physical Laboratory (NPL), Teddington, United Kingdom. The data collected show that a modulation with an amplitude of 50 ps and a period of 700-800 ps affects the equipment of the NPL. In addition, these comparisons show that the noise of the instruments together with the environmental conditions at the PTB was higher than that of the NPL and the BNM-LPTF during the observation period. The best relative frequency stability obtained, in the BNM-LPTF/NPL comparison, is about 3x10(-15) for averaging periods between 6x10(4) s and 3x10(5) s. This result is in good agreement with the expected stability of H-masers. It demonstrates that the noise brought by the GPS carrier phase measurements can be averaged out at this level.

  20. Utilization of coincidence criteria in absolute length measurements by optical interferometry in vacuum and air

    NASA Astrophysics Data System (ADS)

    Schödel, R.

    2015-08-01

    Traceability of length measurements to the international system of units (SI) can be realized by using optical interferometry making use of well-known frequencies of monochromatic light sources mentioned in the Mise en Pratique for the realization of the metre. At some national metrology institutes, such as Physikalisch-Technische Bundesanstalt (PTB) in Germany, the absolute length of prismatic bodies (e.g. gauge blocks) is realized by so-called gauge-block interference comparators. At PTB, a number of such imaging phase-stepping interference comparators exist, including specialized vacuum interference comparators, each equipped with three highly stabilized laser light sources. The length of a material measure is expressed as a multiple of each wavelength. The large number of integer interference orders can be extracted by the method of exact fractions in which the coincidence of the lengths resulting from the different wavelengths is utilized as a criterion. The unambiguous extraction of the integer interference orders is an essential prerequisite for correct length measurements. This paper critically discusses coincidence criteria and their validity for three modes of absolute length measurements: 1) measurements under vacuum in which the wavelengths can be identified with the vacuum wavelengths, 2) measurements under air in which the air refractive index is obtained from environmental parameters using an empirical equation, and 3) measurements under air in which the air refractive index is obtained interferometrically by utilizing a vacuum cell placed along the measurement pathway. For case 3), which corresponds to PTB’s Kösters-Comparator for long gauge blocks, the unambiguous determination of integer interference orders related to the air refractive index could be improved by about a factor of ten when an ‘overall dispersion value,’ suggested in this paper, is used as coincidence criterion.

  1. Providing radiometric traceability for the calibration home base of DLR by PTB

    NASA Astrophysics Data System (ADS)

    Taubert, D. R.; Hollandt, J.; Sperfeld, P.; Pape, S.; Höpe, A.; Hauer, K.-O.; Gege, P.; Schwarzmaier, T.; Lenhard, K.; Baumgartner, A.

    2013-05-01

    A dedicated calibration technique was applied for the calibration of the spectral radiance transfer standard (RASTA) of the German Aerospace Center (DLR) at the Physikalisch-Technische Bundesanstalt (PTB), consisting of two independent but complementing calibration procedures to provide redundancy and smallest possible calibration uncertainties. Procedure I included two calibration steps: In a first step the optical radiation source of RASTA, an FEL lamp, was calibrated in terms of its spectral irradiance Eλ(λ) in the wavelength range from 350 nm to 2400 nm using the PTB Spectral Irradiance Calibration Equipment (SPICE), while in a second step the spectral radiance factor β0°:45°(λ) of the RASTA reflection standard was calibrated in a 0°:45°-viewing geometry in the wavelength range from 350 nm to 1700 nm at the robot-based gonioreflectometer facility of PTB. The achieved relative standard uncertainties (k = 1) range from 0.6 % to 3.2 % and 0.1 % to 0.6 % respectively. Procedure II was completely independent from procedure I and allowed to cover the entire spectral range of RASTA from 350 nm to 2500 nm. In the second procedure, the 0°:45°-viewing geometry spectral radiance Lλ,0°:45°(λ) of RASTA was directly calibrated at the Spectral Radiance Comparator Facility (SRCF) of PTB. The relative uncertainties for this calibration procedure range from 0.8 % in the visible up to 7.5 % at 2500 nm (k = 1). In the overlapping spectral range of both calibration procedures the calculated spectral radiance Lλ,0°:45°,calc(λ) from procedure I is in good agreement with the direct measurement of procedure II, i.e. well within the combined expanded uncertainties (k = 2) of both procedures.

  2. Distance-dependent influences on angle metrology with autocollimators in deflectometry

    NASA Astrophysics Data System (ADS)

    Geckeler, Ralf D.; Just, Andreas

    2008-08-01

    The application of electronic autocollimators to the deflectometric measurement of synchrotron optics in beamline metrology laboratories is steadily increasing. The main reason for this is the availability of commercial high-resolution autocollimators capable of providing highly stable angle metrology down to aperture sizes of a few millimeters, even for uncoated optical surfaces. The measuring beam of the autocollimator not only provides the straight propagation of light as a natural straightness standard, but also tracing back the angle measurement to primary standards via calibration enables one to measure surface shape without any recourse to material straightness artifacts. The Physikalisch-Technische Bundesanstalt (PTB) provides the traceability of angle measurements by autocollimators to the radian (rad) - the SI unit of the plane angle - by use of its WMT 220 angle comparator. The fundamental principle of this comparator is the subdivision of the circle, representing an error-free natural standard of 2π rad. It is realized by various self- and cross-calibration methods. Autocollimators are calibrated by direct comparison with this primary standard with standard uncertainties down to 0.003 arcsec (15 nrad). As the aperture sizes of autocollimators decrease, issues such as the transferability / applicability of the calibration to the measurement conditions in the deflectometric set-up become more and more significant. In this paper we are focusing on the investigation of the influence of the distance between the autocollimator and the surface under test on its angle response. Information on the optimized use and accurate calibration of autocollimators for deflectometric applications is provided.

  3. Specialised teams or personal continuity across inpatient and outpatient mental healthcare? Study protocol for a natural experiment

    PubMed Central

    Giacco, Domenico; Bird, Victoria Jane; McCrone, Paul; Lorant, Vincent; Nicaise, Pablo; Pfennig, Andrea; Bauer, Michael; Ruggeri, Mirella; Lasalvia, Antonio; Moskalewicz, Jacek; Welbel, Marta; Priebe, Stefan

    2015-01-01

    Introduction Mental healthcare organisation can either pursue specialisation, that is, distinct clinicians and teams for inpatient and outpatient care or personal continuity of care, that is, the same primary clinician for a patient across the two settings. Little systematic research has compared these approaches. Existing studies subject have serious methodological shortcomings. Yet, costly reorganisations of services have been carried out in different European countries, inconsistently aiming to achieve specialisation or personal continuity of care. More reliable evidence is required on whether specialisation or continuity of care is more effective and cost-effective, and whether this varies for different patient groups and contexts. Design and methods In a natural experiment, we aim to recruit at least 6000 patients consecutively admitted to inpatient psychiatric care in Belgium, Germany, Italy, Poland, and the UK. In each country, care approaches supporting specialisation and personal continuity coexist. Patients will be followed up at 1 year to compare outcomes, costs and experiences. Inclusion criteria are: 18 years of age or older; clinical diagnosis of psychosis, affective disorder or anxiety/somatisation disorder; sufficient command of the language of the host country; absence of cognitive deterioration and/or organic brain disorders; and capacity to provide informed consent. Ethics and dissemination Ethical approval was obtained in all countries: (1) England: NRES Committee North East—Newcastle & North Tyneside (ref: 14/NE/1017); (2) Belgium: Comité d'Ethique hospitalo-facultaire des Cliniques St-Luc; (3) Germany: Ethical Board, Technische Universität Dresden; (4) Italy: Comitati Etici per la sperimentazione clinica (CESC) delle provincie di Verona, Rovigo, Vicenza, Treviso, Padova; (5) Poland: Komisja Bioetyczna przy Instytucie Psychiatrii i Neurologii w Warszawie. We will disseminate the findings through scientific publications and a study

  4. Final Report on the Torque Key Comparison CCM.T-K2 Measurand Torque: 0 kN·m, 10 kN·m, 20 kN·m

    NASA Astrophysics Data System (ADS)

    Röske, D.; Ogushi, K.

    2016-01-01

    The purpose of the CIPM comparison CCM.T-K2 was to compare the measuring capabilities up to 20 kN m of deadweight torque standard machines with supported lever and reference-type torque standard machines in national metrology institutes. Five institutes participated, with the Physikalisch-Technische Bundesanstalt (PTB, Braunschweig, Germany) acting as the pilot laboratory. Two very stable torque transducers with well-known properties were used as travelling standards. The circulation of these transducers started in October 2008 and ended in May 2010. According to the technical protocol, torque steps of 10 kN m and 20 kN m had to be measured both in clockwise and anticlockwise directions. Corrections had to be applied to the results reported by the participants taking into account the use of different amplifiers, the creep (due to different loading times of the machines) and the environmental conditions in the laboratories (temperature and relative humidity of the ambient air). For each of the two torque steps and both senses of direction of the torque vector, a key comparison reference value was calculated. One participant had a problem with the own machine and the measurement results could not be used for the calculation of the corresponding reference values. The agreement between the results of the other participants is very good. The smallest relative standard uncertainty of the machines stated by the participants is between 1 × 10-5 and 2.5 × 10-4. The results of the comparison support these uncertainty statements. Main text To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

  5. OnlineTED.com--a novel web-based audience response system for higher education. A pilot study to evaluate user acceptance.

    PubMed

    Kühbeck, Felizian; Engelhardt, Stefan; Sarikas, Antonio

    2014-01-01

    Audience response (AR) systems are increasingly used in undergraduate medical education. However, high costs and complexity of conventional AR systems often limit their use. Here we present a novel AR system that is platform independent and does not require hardware clickers or additional software to be installed. "OnlineTED" was developed at Technische Universität München (TUM) based on Hypertext Preprocessor (PHP) with a My Structured Query Language (MySQL)-database as server- and Javascript as client-side programming languages. "OnlineTED" enables lecturers to create and manage question sets online and start polls in-class via a web-browser. Students can participate in the polls with any internet-enabled device (smartphones, tablet-PCs or laptops). A paper-based survey was conducted with undergraduate medical students and lecturers at TUM to compare "OnlineTED" with conventional AR systems using clickers. "OnlineTED" received above-average evaluation results by both students and lecturers at TUM and was seen on par or superior to conventional AR systems. The survey results indicated that up to 80% of students at TUM own an internet-enabled device (smartphone or tablet-PC) for participation in web-based AR technologies. "OnlineTED" is a novel web-based and platform-independent AR system for higher education that was well received by students and lecturers. As a non-commercial alternative to conventional AR systems it may foster interactive teaching in undergraduate education, in particular with large audiences.

  6. Iron Disilicide as High-Temperature Reference Material for Traceable Measurements of Seebeck Coefficient Between 300 K and 800 K

    NASA Astrophysics Data System (ADS)

    Ziolkowski, Pawel; Stiewe, Christian; de Boor, Johannes; Druschke, Ines; Zabrocki, Knud; Edler, Frank; Haupt, Sebastian; König, Jan; Mueller, Eckhard

    2017-01-01

    Thermoelectric generators (TEGs) convert heat to electrical energy by means of the Seebeck effect. The Seebeck coefficient is a central thermoelectric material property, measuring the magnitude of the thermovoltage generated in response to a temperature difference across a thermoelectric material. Precise determination of the Seebeck coefficient provides the basis for reliable performance assessment in materials development in the field of thermoelectrics. For several reasons, measurement uncertainties of up to 14% can often be observed in interlaboratory comparisons of temperature-dependent Seebeck coefficient or in error analyses on currently employed instruments. This is still too high for an industrial benchmark and insufficient for many scientific investigations and technological developments. The TESt (thermoelectric standardization) project was launched in 2011, funded by the German Federal Ministry of Education and Research (BMBF), to reduce measurement uncertainties, engineer traceable and precise thermoelectric measurement techniques for materials and TEGs, and develop reference materials (RMs) for temperature-dependent determination of the Seebeck coefficient. We report herein the successful development and qualification of cobalt-doped β-iron disilicide ( β-Fe0.95Co0.05Si2) as a RM for high-temperature thermoelectric metrology. A brief survey on technological processes for manufacturing and machining of samples is presented. Focus is placed on metrological qualification of the iron disilicide, results of an international round-robin test, and final certification as a reference material in accordance with ISO-Guide 35 and the "Guide to the expression of uncertainty in measurement" by the Physikalisch-Technische Bundesanstalt, the national metrology institute of Germany.

  7. Determination of lead equivalent values according to IEC 61331-1:2014—Report and short guidelines for testing laboratories

    NASA Astrophysics Data System (ADS)

    Büermann, L.

    2016-09-01

    Materials used for the production of protective devices against diagnostic medical X-radiation described in the international standard IEC 61331-3 need to be specified in terms of their lead attenuation equivalent thickness according to the methods described in IEC 61331-1. In May 2014 the IEC published the second edition of these standards which contain improved methods for the determination of attenuation ratios and the corresponding lead attenuation equivalent thicknesses of lead-reduced or lead-free materials. These methods include the measurement of scattered photons behind the protective material which were hitherto neglected but are becoming more important because of the increasing use of lead-reduced or even lead-free materials. They can offer the same protective effect but are up to 20% lighter and also easier to dispose of. The new method is based on attenuation ratios measured with the so-called ``inverse broad beam condition''. Since the corresponding measurement procedure is new and in some respects more complex than the methods used in the past, it was regarded as being helpful to have a description of how such measurements can reliably be performed. This technical report describes in detail the attenuation ratio measurements and corresponding procedures for the lead equivalent determinations of sample materials using the method with the inverse broad beam condition as carried out at the Physikalisch-Technische Bundesanstalt (PTB). PTB still offers material testing and certification for the German responsible notified body. In addition to the description of the measurements at PTB, a short technical guide is provided for testing laboratories which intend to establish this kind of protective material certification. The guide includes technical recommendations for the testing equipment like X-ray facilities, reference lead sheets and radiation detectors; special procedures for the determination of the lead attenuation equivalent thickness; their

  8. Final report on the torque comparison EURAMET.M.T-S2, measurand torque: 10 N.m, 20 N.m, 40 N.m, 60 N.m, 80 N.m, and 100 N.m

    NASA Astrophysics Data System (ADS)

    Röske, Dirk

    2017-01-01

    The purpose of the EURAMET comparison EURAMET.M.T-S2 was to compare the measuring capabilities up to 100 N.m of a reference-type torque calibration machine of ZAG, Slovenia, with the torque standard machine of the Physikalisch-Technische Bundesanstalt (PTB, Braunschweig, Germany) acting as pilot laboratory. A very stable TT1 torque transducer with well-known properties and two torque measuring bridges was used as travelling standard. According to the technical protocol, torque steps of at least 10 N.m, 20 N.m, 40 N.m, 60 N.m, 80 N.m, and 100 N.m had to be measured both in clockwise and anticlockwise directions. For each of the torque steps and both senses of direction of the torque vector, En values were calculated. The results are in general in good agreement with the claimed measurement uncertainties except for the very first measurement at ZAG with additional support and four plate couplings. It seems to be sufficient in a vertical set-up (vertical torque axis) to use only two flexible couplings and there is no need for a further support between the transducers. The measurements with two couplings fulfill the requirement to the En value and support ZAG's claimed uncertainties of measurement. Main text To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

  9. Calibration of a Bonner sphere extension (BSE) for high-energy neutron spectrometry

    PubMed Central

    Howell, R.M.; Burgett, E.A.; Wiegel, B.; Hertel, N.E.

    2011-01-01

    In a recent work, we constructed modular multisphere system which expands upon the design of an existing, commercially available Bonner sphere system by adding concentric shells of copper, tungsten, or lead. Our modular multisphere system is referred to as the Bonner Sphere Extension (BSE). The BSE was tested in a high energy neutron beam (thermal to 800 MeV) at Los Alamos Neutron Science Center and provided improvement in the measurement of the neutron spectrum in the energy regions above 20 MeV when compared to the standard BSS (Burgett, 2008 and Howell et al., 2009). However, when the initial test of the system was carried-out at LANSCE, the BSE had not yet been calibrated. Therefore the objective of the present study was to perform calibration measurements. These calibration measurements were carried out using monoenergetic neutron ISO 8529-1 reference beams at the Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany. The following monoenergetic reference beams were used for these experiments: 14.8 MeV, 1.2 MeV, 565 keV, and 144 keV. Response functions for the BSE were calculated using the Monte Carlo N-Particle Code, eXtended (MCNPX). The percent difference between the measured and calculated responses was calculated for each sphere and energy. The difference between measured and calculated responses for individual spheres ranged between 7.9 % and 16.7 % and the arithmetic mean for all spheres was (10.9 ± 1.8) %. These sphere specific correction factors will be applied for all future measurements carried-out with the BSE. PMID:22888283

  10. Status of the nanometer comparator at PTB

    NASA Astrophysics Data System (ADS)

    Fluegge, Jens; Koening, Rainer G.

    2001-10-01

    Due to increasing demands on the photolithography of integrated circuits and the progress of interferometric linear encoders, length measurement systems with a reproducibility under 3 nm are used in industry today, whereas the connection to the unit of length exhibits an uncertainty of about 25 nm. To resolve this problem a new one dimensional length comparator, the nanometer comparator, was developed in a cooperation between the Physikalisch-Technische Bundesanstalt (PTB), the Dr. Johannes Heidenhain GmbH and Werth Me#technik GmbH. The nanometer comparator will be able to perform one dimensional calibrations of photo masks, line-graduation scales, incremental linear encoders and laser interferometers in one axis up to a maximum length of 610 mm. To ensure the highest level of measurement performance, the interferometer is completely located in vacuum using metal bellows, whilst the calibration objects can be mounted under atmospheric conditions. The interferometer set-up compensates the dilatation and the bending of the granite base and minimizes the measurement circle of the comparator. This will minimize the influence of thermal and mechanical distortions. The interferometer design can be used with a heterodyne or a homodyne signal detection electronics. Due to their high power dissipation, the laser is arranged far apart from the comparator and light is fed to the interferometers by means of glass fibers. The light source is a frequency-doubled Nd:YAG laser frequency stabilized by an iodine absorption line. Different measuring systems for the structure localization can be attached to an universal sensor carrier on a solid bridge above the measuring carriage. Incremental reading heads and two photoelectric microscopes are now available for this purpose.

  11. FOREWORD: Conference on Advanced Metrology for Cancer Therapy 2011 Conference on Advanced Metrology for Cancer Therapy 2011

    NASA Astrophysics Data System (ADS)

    Ankerhold, Ulrike

    2012-10-01

    Although physical treatments play a central role in cancer therapy, SI-traceable metrology has only been established for some of them. Several forms of treatment currently used (particularly intensity-modulated radiation therapy (IMRT), hadron therapy, high-intensity therapeutic ultrasound (HITU) and brachytherapy) suffer from the limited metrological support, which restricts the success of these techniques. Recognizing this deficit, the European Union identified metrology for health as one of the first four Targeted Programmes in the framework of the European Metrology Research Programme (EMRP) running from 2008 to 2011. This programme included two EMRP projects addressing metrology for cancer therapy: project T2.J06 dealing with brachytherapy project T2.J07 dealing with external beam cancer therapy using ionizing radiation and high-intensity therapeutic ultrasound. Primary measurement standards applicable to modern treatment conditions were developed under both projects, together with measurement techniques which are meant as a basis for future protocols for dosimetry, treatment planning and monitoring. In order to provide a platform for the presentation of current developments in clinical measurement techniques for cancer therapy, together with the achievements of both projects, an international Conference on Advanced Metrology for Cancer Therapy (CAMCT) was held from 29 November to 1 December 2011 at the Physikalisch-Technische Bundesanstalt (PTB) in Braunschweig, Germany. The main sessions of the conference: Primary and secondary standards of absorbed dose to water for IMRT and brachytherapy, 3D dose distributions and treatment planning for IMRT and brachytherapy, Hadron therapy (protons and carbon ions), High-intensity therapeutic ultrasound (HITU), were geared to the main foci of the projects. Metrologists and medical physicists from countries all over the world attended the conference and made it into a forum for the exchange of information and expertise

  12. Determination of line profiles on nano-structured surfaces using EUV and x-ray scattering

    NASA Astrophysics Data System (ADS)

    Soltwisch, Victor; Wernecke, Jan; Haase, Anton; Probst, Jürgen; Schoengen, Max; Krumrey, Michael; Scholze, Frank; Pomplun, Jan; Burger, Sven

    2014-09-01

    Non-imaging techniques like X-ray scattering are supposed to play an important role in the further development of CD metrology for the semiconductor industry. Grazing Incidence Small Angle X-ray Scattering (GISAXS) provides directly assessable information on structure roughness and long-range periodic perturbations. The disadvantage of the method is the large footprint of the X-ray beam on the sample due to the extremely shallow angle of incidence. This can be overcome by using wavelengths in the extreme ultraviolet (EUV) spectral range, EUV small angle scattering (EUVSAS), which allows for much steeper angles of incidence but preserves the range of momentum transfer that can be observed. Generally, the potentially higher momentum transfer at shorter wavelengths is counterbalanced by decreasing diffraction efficiency. This results in a practical limit of about 10 nm pitch for which it is possible to observe at least the +/- 1st diffraction orders with reasonable efficiency. At the Physikalisch-Technische Bundesanstalt (PTB), the available photon energy range extends from 50 eV up to 10 keV at two adjacent beamlines. PTB commissioned a new versatile Ellipso-Scatterometer which is capable of measuring 6" square substrates in a clean, hydrocarbon-free environment with full flexibility regarding the direction of the incident light polarization. The reconstruction of line profiles using a geometrical model with six free parameters, based on a finite element method (FEM) Maxwell solver and a particle swarm based least-squares optimization yielded consistent results for EUV-SAS and GISAXS. In this contribution we present scatterometry data for line gratings and consistent reconstruction results of the line geometry for EUV-SAS and GISAXS.

  13. Frequency Comparison of [Formula: see text] Ion Optical Clocks at PTB and NPL via GPS PPP.

    PubMed

    Leute, J; Huntemann, N; Lipphardt, B; Tamm, Christian; Nisbet-Jones, P B R; King, S A; Godun, R M; Jones, J M; Margolis, H S; Whibberley, P B; Wallin, A; Merimaa, M; Gill, P; Peik, E

    2016-07-01

    We used precise point positioning, a well-established GPS carrier-phase frequency transfer method to perform a direct remote comparison of two optical frequency standards based on single laser-cooled [Formula: see text] ions operated at the National Physical Laboratory (NPL), U.K. and the Physikalisch-Technische Bundesanstalt (PTB), Germany. At both institutes, an active hydrogen maser serves as a flywheel oscillator which is connected to a GPS receiver as an external frequency reference and compared simultaneously to a realization of the unperturbed frequency of the (2)S1/2(F=0)-(2)D3/2(F=2) electric quadrupole transition in [Formula: see text] via an optical femtosecond frequency comb. To profit from long coherent GPS-link measurements, we extrapolate the fractional frequency difference over the various data gaps in the optical clock to maser comparisons which introduces maser noise to the frequency comparison but improves the uncertainty from the GPS-link instability. We determined the total statistical uncertainty consisting of the GPS-link uncertainty and the extrapolation uncertainties for several extrapolation schemes. Using the extrapolation scheme with the smallest combined uncertainty, we find a fractional frequency difference [Formula: see text] of -1.3×10(-15) with a combined uncertainty of 1.2×10(-15) for a total measurement time of 67 h. This result is consistent with an agreement of the frequencies realized by both optical clocks and with recent absolute frequency measurements against caesium fountain clocks within the corresponding uncertainties.

  14. Can near-peer medical students effectively teach a new curriculum in physical examination?

    PubMed Central

    2013-01-01

    Background Students in German medical schools frequently complain that the subject ‘clinical examination’ is not taught in a satisfying manner due to time constraints and lack of personnel resources. While the effectiveness and efficiency of practice-oriented teaching in small groups using near-peer teaching has been shown, it is rarely used in German medical schools. We investigated whether adding a new near-peer teaching course developed with student input plus patient examination under supervision in small groups improves basic clinical examination skills in third year medical students compared to a traditional clinical examination course alone. Methods Third year medical students registered for the mandatory curricular clinical examination course at the medical faculty of the Technische Universität München were invited to participate in a randomised trial with blinded outcome assessment. Students were randomised to the control group participating in the established curricular physical examination course or to the intervention group, which received additional near-peer teaching for the same content. The learning success was verified by a voluntary objective structured clinical examination (OSCE). Results A total of 84 students were randomised and 53 (63%) participated in the final OSCE. Students in the control group scored a median of 57% (25th percentile 47%, 75th percentile 61%) of the maximum possible total points of the OSCE compared to 77% (73%, 80%; p < 0.001) for students in the intervention group. Only two students in the intervention group received a lower score than the best student in the control group. Conclusion Adding a near-peer teaching course to the routine course significantly improved the clinical examination skills of medical students in an efficient manner in the context of a resource-constrained setting. PMID:24325639

  15. Capillary blood islet autoantibody screening for identifying pre-type 1 diabetes in the general population: design and initial results of the Fr1da study

    PubMed Central

    Raab, Jennifer; Haupt, Florian; Scholz, Marlon; Matzke, Claudia; Warncke, Katharina; Lange, Karin; Assfalg, Robin; Weininger, Katharina; Wittich, Susanne; Löbner, Stephanie; Beyerlein, Andreas; Nennstiel-Ratzel, Uta; Lang, Martin; Laub, Otto; Dunstheimer, Desiree; Bonifacio, Ezio; Achenbach, Peter; Winkler, Christiane; Ziegler, Anette-G

    2016-01-01

    Introduction Type 1 diabetes can be diagnosed at an early presymptomatic stage by the detection of islet autoantibodies. The Fr1da study aims to assess whether early staging of type 1 diabetes (1) is feasible at a population-based level, (2) prevents severe metabolic decompensation observed at the clinical manifestation of type 1 diabetes and (3) reduces psychological distress through preventive teaching and care. Methods and analysis Children aged 2–5 years in Bavaria, Germany, will be tested for the presence of multiple islet autoantibodies. Between February 2015 and December 2016, 100 000 children will be screened by primary care paediatricians. Islet autoantibodies are measured in capillary blood samples using a multiplex three-screen ELISA. Samples with ELISA results >97.5th centile are retested using reference radiobinding assays. A venous blood sample is also obtained to confirm the autoantibody status of children with at least two autoantibodies. Children with confirmed multiple islet autoantibodies are diagnosed with pre-type 1 diabetes. These children and their parents are invited to participate in an education and counselling programme at a local diabetes centre. Depression and anxiety, and burden of early diagnosis are also assessed. Results Of the 1027 Bavarian paediatricians, 39.3% are participating in the study. Overall, 26 760 children have been screened between February 2015 and November 2015. Capillary blood collection was sufficient in volume for islet autoantibody detection in 99.46% of the children. The remaining 0.54% had insufficient blood volume collected. Of the 26 760 capillary samples tested, 0.39% were positive for at least two islet autoantibodies. Discussion Staging for early type 1 diabetes within a public health setting appears to be feasible. The study may set new standards for the early diagnosis of type 1 diabetes and education. Ethics dissemination The study was approved by the ethics committee of Technische Universit

  16. Autocollimators for Deflectometry: Current Status and Future Progress

    SciTech Connect

    Geckeler, Ralf; Just, Andreas; Krause, Michael; Yashchuk, Valeriy V.

    2009-06-15

    The proliferation of autocollimator-based surface profilometers at synchrotron metrology laboratories worldwide necessitates a detailed understanding of the parameters influencing their angular response. A comprehensive overview of the current status of autocollimator characterization and calibration at the Physikalisch-Technische Bundesanstalt (PTB) and its implications for their optimal application are provided, as well as information on future challenges and expected progress. Autocollimator-based deflectometric profilometers are in operation at the PTB, the Advanced Light Source (ALS), Lawrence Berkeley National Laboratory, USA, the BESSY II, Helmholtz-Zentrum Berlin fuer Materialien und Energie GmbH, Germany, and the Diamond Light Source Ltd (DLS), UK. A continuous topic of research at the PTB is to investigate the factors influencing the angular response of autocollimators and to provide the most accurate calibration of the instruments to aid users in their application and manufacturers in their improvements [1-3]. At the PTB, the calibration of autocollimators is realized by a direct comparison of the devices with the primary angle reference standard [1]. With highly stable autocollimators, calibrations with standard measurement uncertainties of u = 0.003 arcsec (15 nrad) have been achieved [2,3]. The influence of a number of parameters on the angle measurement with autocollimators have been investigated in detail, such as the reflectivity of the surface under test (SUT), the diameter and shape of the aperture stop, its position both along the autocollimator's optical axis and perpendicular to it [2], as well as the optical path length of the autocollimator beam [3]. Extensive information on these errors and their minimization will be presented.

  17. Providing radiometric traceability for the calibration home base of DLR by PTB

    SciTech Connect

    Taubert, D. R.; Hollandt, J.; Sperfeld, P.; Pape, S.; Hoepe, A.; Hauer, K.-O.; Gege, P.; Schwarzmaier, T.; Lenhard, K.; Baumgartner, A.

    2013-05-10

    A dedicated calibration technique was applied for the calibration of the spectral radiance transfer standard (RASTA) of the German Aerospace Center (DLR) at the Physikalisch-Technische Bundesanstalt (PTB), consisting of two independent but complementing calibration procedures to provide redundancy and smallest possible calibration uncertainties. Procedure I included two calibration steps: In a first step the optical radiation source of RASTA, an FEL lamp, was calibrated in terms of its spectral irradiance E{sub {lambda}}({lambda}) in the wavelength range from 350 nm to 2400 nm using the PTB Spectral Irradiance Calibration Equipment (SPICE), while in a second step the spectral radiance factor {beta}{sub 0 Degree-Sign :45 Degree-Sign }({lambda}) of the RASTA reflection standard was calibrated in a 0 Degree-Sign :45 Degree-Sign -viewing geometry in the wavelength range from 350 nm to 1700 nm at the robot-based gonioreflectometer facility of PTB. The achieved relative standard uncertainties (k= 1) range from 0.6 % to 3.2 % and 0.1 % to 0.6 % respectively. Procedure II was completely independent from procedure I and allowed to cover the entire spectral range of RASTA from 350 nm to 2500 nm. In the second procedure, the 0 Degree-Sign :45 Degree-Sign -viewing geometry spectral radiance L{sub {lambda},0 Degree-Sign :45 Degree-Sign }({lambda}) of RASTA was directly calibrated at the Spectral Radiance Comparator Facility (SRCF) of PTB. The relative uncertainties for this calibration procedure range from 0.8 % in the visible up to 7.5 % at 2500 nm (k= 1). In the overlapping spectral range of both calibration procedures the calculated spectral radiance L{sub {lambda},0 Degree-Sign :45 Degree-Sign ,calc}({lambda}) from procedure I is in good agreement with the direct measurement of procedure II, i.e. well within the combined expanded uncertainties (k= 2) of both procedures.

  18. Efficacy risks of the minimal-invasive plastic and reconstructive neovagina Vecchietti technique in Mayer-Rokitansky-Küster-Hauser syndrome.

    PubMed

    Cezar, Cristina; Devassy, Rajesh; Larbig, Angelika; De Wilde, Rudy Leon

    2014-01-01

    Einleitung: Das Mayer-Rokitansky-Küster-Hauser (MRKH)-Syndrom ist eine angeborene Fehlbildung, klinisch charakterisiert durch primäre Amenorrhö und Infertilität, kongenitale Aplasie des Uterus und der oberen Vagina. Die Patientinnen haben einen weiblichen Karyotyp (46, XX), normale ovarielle Funktion und reguläre Entwicklung der sekundären Geschlechtsmerkmale. Das erste Anzeichen des Syndroms ist normalerweise, dass der Menstruationszyklus nicht einsetzt. Die psychische Belastung des Syndroms kann überwältigend sein, die körperlichen Störungen können aber durch chirurgische Intervention erfolgreich behandelt werden. Der chirurgische Eingriff ermöglicht eine normale sexuelle Funktion. Es ist auch eine assistierte Reproduktion möglich. Das Studienziel ist die Überprüfung der Effizienzrisiken bei der traditionellen laparoskopischen Vecchietti-Methode in der plastischen und rekonstruktiven Chirurgie der vaginalen Agenesie. Es wurde eine prospektive, single-center, single-arm Studie durchgeführt, und Komplikationen sowie anatomische und funktionelle Ergebnisse wurden dokumentiert. Material und Methodik: Die Studie wurde zwischen 2003 und 2011 in der gynäkologischen Klinik von Kochi’s Lakshmi Hospital, Kerala in Indien durchgeführt, an der 53 Patientinnen mit dem MRKH Syndrom teilnahmen. Alle Patientinnen hatten primäre Amenorrhö und der Karyotyp war (46, XX). Die klinische Verdachtsdiagnose wurde ultrasonographisch und operativ bestätigt: Agenesie des Uterus oder rudimentäre Uterushörner und normale Eierstöcke. Alle Patientinnen haben eine plastische laparoskopische Konstruktion einer Neovagina erhalten. Wir führten eine kombinierte Behandlungsstrategie durch: eine präoperative psychologische Beratung, gefolgt von einem chirurgischen Eingriff und postoperativen Follow-up. Es wurde eine laparoskopisch modifizierte Vecchietti-Methode durchgeführt. Alle Patientinnen wurden bei der Entlassung über die Notwendigkeit sexueller vaginaler Aktivit

  19. Peyton's 4-Steps-Approach in comparison: Medium-term effects on learning external chest compression - a pilot study.

    PubMed

    Münster, Tobias; Stosch, Christoph; Hindrichs, Nina; Franklin, Jeremy; Matthes, Jan

    2016-01-01

    Einführung: Die extrakorporale Herzdruckmassage ist eine wichtige Fertigkeit, um ein Minimum der Organdurchblutung bei Patienten/-innen mit Herz-Kreislauf-Stillstand zu gewährleisten, bis weitere medizinische Hilfe geleistet werden kann. Eine Methode um diese Fertigkeit zu vermitteln ist der Ansatz nach Peyton. Dieser besteht aus 4 Schritten: Demonstration, Dekonstruktion, Verständnis und Durchführung. Bezogen auf die kardiopulmonale Reanimation wird eine Überlegenheit dieser Methode gegenüber Anderen angenommen, ist jedoch bisher durch Studien nicht ausreichend gesichert. In unserer Studie haben wir den mittelfristigen Lernerfolg durch die 4-Schritt-Methode nach Peyton („PEY“) mit dem der Modifikation „PMOD“ (4-Schritt-Methode ohne Schritt 3) und dem „STDM“ (Standardmodell, entsprechend der weit verbreiteten Methode „See one Do one“, entspricht der 4-Schritt-Methode ohne Schritt 1 und 3,) anhand von Parametern der Durchführung einer Herzdruckmassage am Modell verglichen.Material und Methoden: Die prospektiv, randomisierte Pilotstudie wurde im Sommersemester 2009 im Kölner Interprofessionellen SkillsLab und Simulationszentrum (KISS) an der Universität zu Köln durchgeführt. Die Probanden (Studierende der Humanmedizin des zweiten und dritten Fachsemesters) nahmen freiwillig an der Studie teil. Die Studierenden wurden in drei parallele Studiengruppen randomisiert, die nach jeweils einer der oben genannten Methoden unterrichtet wurden. Eine Woche sowie fünf bzw. sechs Monate nach Intervention wurden die Probanden in einer objektivierten strukturierten Einzel-Überprüfung bzgl. ihrer Reanimationsfertigkeiten geprüft. Die Ergebnisse der Gruppen wurden hinsichtlich der Parameter Kompressionsfrequenz, Kompressionstiefe, Anteil richtiger Kompressionen sowie Anzahl in einer Checkliste erreichter Items verglichen. Verglichen wurden außerdem Häufigkeitsverteilungen bezogen auf das Umsetzen oder Verfehlen damals geltender Leitlinienempfehlungen

  20. Multidrug-resistant organisms in refugees: prevalences and impact on infection control in hospitals.

    PubMed

    Heudorf, Ursel; Albert-Braun, Sabine; Hunfeld, Klaus-Peter; Birne, Franz-Ulrich; Schulze, Jörg; Strobel, Klaus; Petscheleit, Knut; Kempf, Volkhard A J; Brandt, Christian

    2016-01-01

    Einleitung: Die Flüchtlingssituation ist eine große Herausforderung für das Gesundheitssystem in vielen Ländern Europas, besonders auch in Deutschland. Eine Vielzahl von Daten zur gesundheitlichen Situation von Flüchtlingen (Infektionen, körperliche Erkrankungen und psych(iatr)ische Probleme) und zu deren Prävention (Hygiene und Impfprogramme) sind publiziert. Jedoch sind Daten zu multiresistenten Erregern (MRE) bei Flüchtlingen vergleichsweise rar, obwohl viele Flüchtlinge aus Ländern mit hoher MRE-Prävalenz stammen und/oder auf ihrer Flucht durch Länder mit hoher MRE-Prävalenz gekommen sind. In der vorliegenden Arbeit werden aktuelle Daten zur MRE-Prävalenz von Flüchtlingen bei Aufnahme in Akutkrankenhäuser vorgestellt und die Bedeutung des Aufnahme-Screenings und des Hygiene-Managements in den Krankenhäusern diskutiert. Methoden: Verschiedene Krankenhäuser in der Rhein-Main-Region teilten die Ergebnisse von Aufnahme-Screening-Untersuchungen von Flüchtlingen anonymisiert dem Gesundheitsamt mit. Die Screening-Untersuchungen wurden zwischen Dezember 2015 und März 2016 nach standardisierten und validierten Methoden vorgenommen. Ergebnisse: 9,8% der bei Klinikaufnahme gescreenten Flüchtlinge (32/325) waren mit Methicillin-resistenten Staphylococcus aureus-Stämmen kolonisiert und 23,3% der Flüchtlinge (67/290) wiesen Gram-negative Erreger mit erweitertem Resistenzspektrum gegen β-Laktam-Antibiotika (ESBL) und/oder Enterobakterien mit Resistenz gegen 3 oder 4 Antibiotikagruppen auf (3MRGN: multiresistente Gram-negative Erreger mit Resistenz gegen Penicilline, Cephalosporine und Fluorchinolone; 4MRGN mit Resistenz gegen die genannten Antibiotikagruppen und zusätzlicher Resistenz gegen Carbapeneme; Definition nach KRINKO 2012). Carbapenem-resistente Gram-negative Erreger (CRE) wurden bei 2,1% (6/290) der untersuchten Flüchtlinge gefunden. Diskussion: Die Daten bestätigen zwischen 2014 und 2016 publizierte Studien, in denen Flüchtlinge bei