Sample records for katrin jgar jt

  1. The Karlsruhe Tritium Neutrino Mass Experiment KATRIN

    SciTech Connect

    Bonn, Jochen [Johannes Gutenberg Universitaet Mainz 55099 Mainz (Germany)

    2008-01-24

    KATRIN is the next generation tritium neutrino mass experiment presently set up at Forschungszentrum Karlsruhe by the international KATRIN collaboration. The aim is to push the present limit on the neutrino mass from 2 eV [1] down to 0.2 eV with the hope to detect a finite mass with discovery potential of 0.35 eV. The experimental set up and the present status of KATRIN will be given.

  2. Katrin Schulz (ILLC) Approaching the Logic of

    E-print Network

    Löwe, Benedikt

    . Speaker knows A f(A,c) = KSA #12;Katrin Schulz (ILLC) 3. The Proposal 3.1 Formalizing Grice How(A,P) = { s S | s = KSA & s' S : s' = KSA s P 1 s'} #12;Katrin Schulz (ILLC) 3. The Proposal 3.2 Example · P = {a, b} · P S those worlds where the speaker is maximal competent eps1 S(A,P) eps2 S(A,P) S KSA #12;Katrin Schulz

  3. JT-60 Control System

    SciTech Connect

    Yonekawa, I.; Kawamata, Y.; Totsuka, T.; Akasaka, H.; Sueoka, M.; Kurihara, K.; Kimura, T. [Japan Atomic Energy Research Institute (Japan)

    2002-09-15

    The present status of the JT-60U control system is reported including its original design concept, the progress of the system, and various modifications since the JT-60 upgrade. This control system has features of a functionally distributed and hierarchical structure, using CAMAC interfaces initially, which have been replaced by versatile module Europe (VME)-bus interfaces, and a protective interlock system composed of both software and hard-wired interlock logics. Plant monitoring and control are performed by efficient data communication through CAMAC highways and Ethernet with TCP/IP protocols. Sequential control of plasma discharges is executed by a combination of a remodeled VME-bus system and a timing system. A real-time plasma control system and a human interface system have been continuously modified corresponding to the progress of JT-60U experiments.

  4. STATISTICAL ACOUSTIC INDICATIONS COARTICULATION Katrin Kirchhoff Bilmes

    E-print Network

    Kirchhoff, Katrin

    STATISTICAL ACOUSTIC INDICATIONS COARTICULATION Katrin Kirchhoff Bilmes Applied Computer Science limited sets using acoustic­ phonetic methods formant analysis. propose a method statistically analyzes a subset Switchboard database analyzed CMI various speaking stress, and vowel category conditions

  5. Katrin Beyer / EESD / katrin.beyer@epfl.ch 129 May 2013 CoMa-WallS Project

    E-print Network

    / katrin.beyer@epfl.ch 429 May 2013 Concrete-Masonry Wall Structure (CoMa-WallS) Shake-table test #12;Katrin Beyer / EESD / katrin.beyer@epfl.ch 529 May 2013 Concrete-Masonry Wall Structure (Co procedure (cutting, burning) · Perforation at small scale with similar void ratio, similar effective width

  6. Status of the KATRIN Neutrino Mass Experiment

    NASA Astrophysics Data System (ADS)

    Parno, Diana; Katrin Collaboration

    2015-04-01

    The Karlsruhe Tritium Neutrino experiment (KATRIN), presently under construction in Germany, will probe the absolute mass scale of the neutrino through the kinematics of tritium beta decay, a nearly model-independent approach. To achieve the projected sensitivity of 0.2 eV at the 90% confidence level, KATRIN will use a windowless, gaseous tritium source and a large magnetic adiabatic collimation-electrostatic filter. The collaboration has now completed a second commissioning phase of the spectrometer and detector section, and construction of the tritium sections is proceeding well. We will report on the current status of the experiment and the outlook for data-taking with tritium. US participation in KATRIN is supported by the U.S. Department of Energy Office of Science, Office of Nuclear Physics under Award Number DE-FG02-97ER41020.

  7. Tritium processing loop for KATRIN experiment

    SciTech Connect

    Kazachenko, O.; Bornschein, B.; Kernert, N.; Doerr, L.; Glugla, M.; Weber, V.; Stern, D. [Forschungszentrum Karlsruhe GmbH, Inst. for Technical Physics, Tritium Laboratory Karlsruhe, Postfach 3640, D-76021 Karlsruhe (Germany)

    2008-07-15

    The design of tritium processing loop for KATRIN tritium source supported by high purity of tritium has been demonstrated. The demonstration has showed tritium beta spectrum using a high energy resolution electrostatic spectrometer with adiabatic magnetic collimation. The demonstration proved that the systematic uncertainties in KATRIN can cause the use of a windowless gaseous tritium source (WGTS) as the main beta source. The tritium processing system (TPS) involves an inner loop providing the circulation of tritium through WGTS and control of isotope composition of the circulating gas. The demonstration compress and purify the pumped tritium by TPS and returned back to the source. The processing capability of the system in the demonstration kept on the level of 40 gram of tritium per day. The demonstration proved that the system can fulfil the requirements of KATRIN project with stable circulation of pure tritium. (authors)

  8. Separation phenomenon in the Windowless Gaseous Tritium Source of KATRIN

    E-print Network

    Sharipov, Felix

    Separation phenomenon in the Windowless Gaseous Tritium Source of KATRIN experiment. Ternary separa- tion. In the KATRIN experiment, in order to analyze the spectrum of electrons emmited by Tritium decay, it is very important to know the concentration distribution of Tritium along the source

  9. Recent experiments in JT-60

    Microsoft Academic Search

    Hiroshi Kishimoto

    1990-01-01

    Recent experiments in JT-60 have been conducted mainly on the plasma parameter improvement and the current drive optimization. Energy confinement can be improved by pellet injection. High beta sub p (less than or equal to 3) discharges are obtained with high power neutral beam (NB) heating and then the bootstrap current becomes dominant in the plasma current. Lower hybrid (LH)

  10. Engineering Feature in the Design of JT-60SA

    E-print Network

    Engineering Feature in the Design of JT-60SA M. Matsukawa for JA-EU satellite tokamak working group and the JT60-SA design team #12;2 AbstractJT-60SA This paper intends to clarify the latest design option of the JT-60SA. (1) JT-60SA Project is one of the ITER Broader Approach. (2) JT-60SA is a combined program

  11. The penning trap electron gun for the KATRIN experiment

    E-print Network

    Trowbridge, Sarah Nicole

    2008-01-01

    The KArlsruhe TRitium Neutrino experiment (KATRIN) is currently in under construction, with plans to be activated in 2010. The experiment will measure the energy of electrons recoiling from the three body beta decay of ...

  12. JT-60SA Euratom Overview of Modification of JT-60U

    E-print Network

    1 JT-60SA Euratom Overview of Modification of JT-60U for the Satellite Tokamak Program as oneSA Design Team title21st IAEA Fusion Energy Conference Chengdu, China, 16-21 October 2006 FT/2-5 #12;2 JT-60SA Euratom JA-EU satellite Tokamak Working Group: S. Matsuda1), M. Kikuchi1), Y. Takase2), Y

  13. J.T. Anderson ,,10 Cusco, Peru

    E-print Network

    J.T. Anderson ,,10 Cusco, Peru In the summer of May 2010, I was honored to be given an opportunity in Peru. It is located near the Urubamba Valley of the Andes mountain range. Cusco has its historic roots

  14. Focal-plane detector system for the KATRIN experiment

    E-print Network

    J. F. Amsbaugh; J. Barrett; A. Beglarian; T. Bergmann; H. Bichsel; L. I. Bodine; J. Bonn; N. M. Boyd; T. H. Burritt; Z. Chaoui; S. Chilingaryan; T. J. Corona; P. J. Doe; J. A. Dunmore; S. Enomoto; J. Fischer; J. A. Formaggio; F. M. Fränkle; D. Furse; H. Gemmeke; F. Glück; F. Harms; G. C. Harper; J. Hartmann; M. A. Howe; A. Kaboth; J. Kelsey; M. Knauer; A. Kopmann; M. L. Leber; E. L. Martin; K. J. Middleman; A. W. Myers; N. S. Oblath; D. S. Parno; D. A. Peterson; L. Petzold; D. G. Phillips II; P. Renschler; R. G. H. Robertson; J. Schwarz; M. Steidl; D. Tcherniakhovski; T. Thümmler; T. D. Van Wechel; B. A. VanDevender; S. Vöcking; B. L. Wall; K. L. Wierman; J. F. Wilkerson; S. Wüstling

    2015-01-28

    The focal-plane detector system for the KArlsruhe TRItium Neutrino (KATRIN) experiment consists of a multi-pixel silicon p-i-n-diode array, custom readout electronics, two superconducting solenoid magnets, an ultra high-vacuum system, a high-vacuum system, calibration and monitoring devices, a scintillating veto, and a custom data-acquisition system. It is designed to detect the low-energy electrons selected by the KATRIN main spectrometer. We describe the system and summarize its performance after its final installation.

  15. CONVERSATIONAL SPEECH RECOGNITION USING ACOUSTIC AND ARTICULATORY Katrin Kirchhoff

    E-print Network

    Kirchhoff, Katrin

    CONVERSATIONAL SPEECH RECOGNITION USING ACOUSTIC AND ARTICULATORY INPUT Katrin Kirchhoff Department task. In this study we extend this approach to large­vocabulary conversational speech recognition using in speech recognition is increasingly gaining popularity. An ensemble of recognizers with different

  16. Bolometric measurements in JT-60

    SciTech Connect

    Nishitani, T.; Nagashima, K.; Sugiyama, T.; Hara, M.; Takeuchi, H.; JT-60 Team

    1988-08-01

    Radiation losses from the main plasma of the JAERI Tokamak-60 (JT-60) were measured by a 15-channel bolometer array and those from divertor chambers in the ion and electron drift sides were each measured by two bolometers. The bolometric detector consisting of three layers (5-..mu..m-thick gold absorber, 7-..mu..m-thick polyimide foil, and 0.1-..mu..m-thick gold resistor grid) was developed for this measurement. In typical diverted discharges with NB heating, the ratios of power radiated from the main and divertor chambers to the absorbed power were approximately 10% and 20%, respectively. Intense poloidal asymmetries of radiated power localized near the X point outside the torus were observed in diverted discharges. The profiles of the radiated power were reconstructed by an Abel inversion with an asymmetric term. On the other hand, a poloidally asymmetric radiation band localized near the inner wall, ''marfe,'' was observed for dense plasmas in limiter discharges with neutral beam heating.

  17. Wall conditioning in JT-60

    NASA Astrophysics Data System (ADS)

    Arai, T.; Yamamoto, M.; Akino, N.; Kodama, K.; Nakamura, H.; Niikura, S.; Takatsu, H.; Shimizu, M.; Ohkubo, M.; Ohta, M.; JT-60 Team

    1987-02-01

    The vacuum vessel of JT-60 has a volume of 160 m 3 and a vacuum side surface of 2750 m 2 containing the surfaces of the first wall and many types of ports. The first wall is made of 20 ?m TiC coated molybdenum and Inconel 625, bolted to the inner surface of the vacuum vessel. The vacuum vessel is evacuated with four identical pumping systems with a total pumping speed of 29 m 3/s for hydrogen. The wall conditioning procedure consisted of two wipes with special cloths wetted by freon after hot water and freon jet cleaning, and three bakeouts were carried out before the first plasma production. An ultimate pressure of 7.4 × 10 -7 Pa and an outgassing rate of 6.8 × 10 -10 Pa m 3/s m 2 were obtained. Low current pulse discharge cleaning (TDC) was carried out for two weeks at a vacuum vessel temperature of 200°C. The TDC is performed typically with a plasma current of 30 kA, a pulse duration of 40 ms, a repetition period in the range from 0.3 s to 1.2 s, a hydrogen pressure of 5.0 × 10 -3 Pa, and a toroidal field of 0.45 T. The TDC conditioning for 50 h removed a quantity of water vapor corresponding to approximately 0.3 g. The main residual gases consisting of hydrocarbons, were monitored in addition to hydrogen and carbon monoxide.

  18. Production of 83Rb for the KATRIN experiment.

    PubMed

    Rasulbaev, M; Maier, K; Vianden, R; Thümmler, T; Ostrick, B; Weinheimer, Ch

    2008-12-01

    For the neutrino mass determination experiment KATRIN, the long-term stability of the spectrometer voltage is of crucial importance. Therefore, it is planned to control the voltage continuously in a smaller spectrometer, which monitors the position of the conversion electron line emitted in the 32 keV transition in the decay of (83m)Kr. Due to the short half-life of (83m)Kr (t(1/2)=1.83h), it has to be supplied by a long-lived (83m)Kr((83)Rb) generator (t(1/2)=86d). Here, a hitherto unexploited method for the efficient production of (83)Rb and its suitability for its application in the KATRIN monitor spectrometer is described. PMID:18555691

  19. High power heating results on JT-60

    Microsoft Academic Search

    M. Akiba; H. Aikawa; N. Akaoka; H. Akasaka; N. Akino; T. Akiyama; T. Ando; K. Annoh; T. Aoyagi; T. Arai; K. Arakawa; M. Araki; M. Azumi; S. Chiba; M. Dairaku; N. Ebisawa; T. Fujii; T. Fukuda; A. Funahashi; H. Furukawa; K. Hamamatsu; M. Hanada; M. Hara; K. Haraguchi; H. Hiratsuka; T. Hirayama; S. Hiroki; K. Hiruta; M. Honda; H. Horiike; R. Hosoda; N. Hosogane; T. Iijima; Y. Ikeda; K. Ikeda; T. Imai; T. Inoue; N. Isaji; M. Isaka; S. Ishida; K. Itami; N. Ichige; T. Itoh; T. Kakizaki; A. Kaminaga; T. Katoh; M. Kawai; M. Kawabe; Y. Kawamata; K. Kawasaki; K. Kikuchi; M. Kikuchi; H. Kimura; T. Kimura; H. Kishimoto; S. Kitamura; A. Kitsunezaki; K. Kiyono; N. Kobayashi; K. Kodama; S. Koide; Y. Koide; T. Kioke; M. Komata; I. Kondo; S. Konoshima; H. Kubo; S. Kunieda; K. Kurihara; M. Kuriyama; T. Kuroda; M. Kusaka; Y. Kusama; Y. Mabuchi; S. Maehara; K. Maeno; T. Matoba; S. Matsuda; M. Matsukawa; T. Matsukawa; M. Matsuoka; Y. Miura; N. Miya; K. Miyachi; Y. Mori; S. Moriyama; M. Mutoh; M. Nagami; A. Nagashima; K. Nagashima; T. Nagashima; S. Nagaya; O. Naitoh; H. Nakamura; Y. Nakamura; M. Nemoto; Y. Neyatani; H. Ninomiya; N. Nishino; T. Nishitani; K. Obara; H. Obinata; Y. Ogawa; N. Ogiwara; T. Ohga; Y. Ohara; K. Ohasa; H. Oohara; T. Ohshima; M. Ohkubo; S. Ohsawa; K. Ohta; M. Ohta; M. Ohtaka; Y. Ohuchi; A. Oikawa; H. Okumura; Y. Okumura; K. Omori; S. Omori; Y. Omori; T. Ozeki; M. Saegusa; N. Saitoh; K. Sakamoto; A. Sakasai; S. Sakata; T. Sasajima; K. Satou; M. Satou; A. Sakurai; M. Sawahata; T. Sebata; M. Seimiya; M. Seki; S. Seki; K. Shibanuma; R. Shimada; T. Shimada; K. Shimizu; M. Shimizu; Y. Shimomura; S. Shinozaki; H. Shirai; H. Shirakata; M. Shitomi; K. Suganuma; T. Sugie; T. Sugiyama; H. Sunaoshi; K. Suzuki; M. Suzuki; N. Suzuki; S. Suzuki; Y. Suzuki; M. Takahashi; S. Takahashi; T. Takahashi; M. Takasaki; H. Takatsu; H. Takeuchi; A. Takeshita; T. Takizuka; S. Tamura; S. Tanaka; T. Tanaka; K. Tani; M. Terakado; T. Terakado; K. Tobita; T. Tokutake; T. Totsuka; N. Toyoshima; F. Tusda; T. Tsugita; S. Tsuji; Y. Tsukahara; M. Tsuneoka; K. Uehara; M. Umechara; Y. Uramoto; H. Usami; K. Ushigusa; K. Usui; J. Yagyu; M. Yamagiwa; M. Yamamoto; T. Yamamoto; O. Yamashita; T. Yamazaki; T. Yasukawa; K. Yokokura; H. Yokomizo; K. Yokoyama; K. Yoshikawa; M. Yoshikawa; H. Yoshida; R. Yoshino; Y. Yoshioka; I. Yonekawa; T. Yoneda; K. Watanabe; M. G. Bell; R. J. Bickerton; W. Englehardt; R. J. Goldston; E. Kallne; J. Kallne; H. W. Jugel; P. L. Mondiono; F. X. Solnder; Y. Takase; P. R. Thomas; K. L. Wong

    1988-01-01

    From June to October 1987, JT-60 achieved fusion product (ne(0). tau E*.Ti(0)) of 6*1019 m-3.keV.s with hydrogen plasma at plasma current of 2.8 to 3.1 MA with neutral beam power of approximately 20 MW. The central electron density of 1.3*1020 m-3 was obtained at plasma current of 3 MA with 13 approximately 20 MW neutral beam power and the confinement

  20. JT8D and JT9D jet engine performance improvement program. Task 1: Feasibility analysis

    NASA Technical Reports Server (NTRS)

    Gaffin, W. O.; Webb, D. E.

    1979-01-01

    JT8D and JT9D component performance improvement concepts which have a high probability of incorporation into production engines were identified and ranked. An evaluation method based on airline payback period was developed for the purpose of identifying the most promising concepts. The method used available test data and analytical models along with conceptual/preliminary designs to predict the performance improvements, weight, installation characteristics, cost for new production and retrofit, maintenance cost, and qualitative characteristics of candidate concepts. These results were used to arrive at the concept payback period, which is the time required for an airline to recover the investment cost of concept implementation.

  1. The thermal behaviour of the tritium source in KATRIN

    NASA Astrophysics Data System (ADS)

    Grohmann, S.; Bode, T.; Hötzel, M.; Schön, H.; Süßer, M.; Wahl, T.

    2013-05-01

    The tritium source in the Karlsruhe Tritium Neutrino Experiment (KATRIN) will deliver 1011 ? decay electrons per second, in order to determine the mass of the electron antineutrino through analysing the tritium ? spectrum. The source is built of a 10 m long beam tube of 90 mm inner diameter, which is operated at 30 K. Gaseous tritium is injected through a central injection chamber and diffuses towards the tube ends, where it is pumped by large turbomolecular pumps and further processed in a closed tritium loop. In order to achieve the KATRIN sensitivity of 0.2 eV/c2, the decay rate in the source (and hence the tritium density profile) must be stable to a level of ±0.1%. As the density profile is influenced by the beam tube conductance, both the temperature stability and the temperature homogeneity must be within a range of ±0.03 K at 30 K. A thermosiphon with saturated neon was developed for this purpose, with horizontal evaporator tubes connected all along the 10 m beam tube. The system behaviour was tested in a 12 m long test cryostat, containing the original beam tube with the adjacent pumping chambers, as well as the cooling circuits and the thermal shields. The so-called "Demonstrator" was operated in the Tritium Laboratory Karlsruhe (TLK) being connected to the cryogenic infrastructure of KATRIN. The temperature stability was found a factor 20 better than specified, achieving a standard deviation of only 1.5 mK/h, which corresponds to ?T/T = 5 × 10-5 h-1 relative stability at 30 K. The ±0.03 K temperature homogeneity along the 10 m beam tube was not yet reached, because of an increased heat load through the pump ports. The repeatability of the temperature measurement with vapour pressure sensors was within ± 0.004 K.

  2. Absolute neutrino mass scale determination with the KATRIN experiment

    NASA Astrophysics Data System (ADS)

    Glück, F.

    2007-10-01

    The aim of the KArlsruhe TRItium Neutrino experiment KATRIN is the direct and model independent determination of the absolute neutrino mass scale down to 0.2 eV. For this purpose, the integral electron energy spectrum will be measured close to the endpoint of molecular tritium beta decay. The electrostatic retardation method with magnetic adiabatic collimation (MAC-E filter) combines high energy resolution with high statistics and small background. The various components of the experiment (gaseous tritium source, pumping-transport system, pre- and main spectrometer, detector and rear system) are reviewed.

  3. Design of JT-60SA Magnets and Associated Experimental Validations

    Microsoft Academic Search

    L. Zani; P. Barabaschi; D. Duglue; L. Meunier; M. Peyrot; V. Tomarchio; M. Verrecchia; P. Decool; J.-L. Marechal; A. Torre; A. Cucchiaro; A. della Corte; A. Di Zenobio; L. Muzzi; S. Turtu; S. Ishida; K. Yoshida; K. Tsuchiya; K. Kizu; H. Murakami

    2011-01-01

    In the framework of the JT-60SA project, aiming at upgrading the present JT-60U tokamak toward a fully supercon- ducting configuration, the detailed design phase led to adopt for the three main magnet systems a brand new design. Europe (EU) is expected to provide to Japan (JA) the totality of the toroidal field (TF) magnet system, while JA will provide both

  4. Introduction to direct neutrino mass measurements and KATRIN

    NASA Astrophysics Data System (ADS)

    Thümmler, T.; Katrin Collaboration

    2012-08-01

    The properties of neutrinos and especially their rest mass play an important role at the intersections of cosmology, particle physics and astroparticle physics. At present there are two complementary approaches to address this topic in laboratory experiments. The search for neutrinoless double beta decay probes whether neutrinos are Majorana particles and determines an effective neutrino mass value. On the other hand experiments such as MARE, KATRIN and the recently proposed Project 8 will investigate the spectral shape of ?-decay electrons close to their kinematic endpoint in order to determine the neutrino rest mass with a model-independent method. Here, because of neutrino flavour mixing, the neutrino mass appears as an average of all neutrino mass eigenstates contributing to the electron neutrino. The KArlsruhe TRItium Neutrino experiment (KATRIN) is currently the experiment in the most advanced status of commissioning. It combines an ultra-luminous molecular windowless gaseous tritium source with an integrating high-resolution spectrometer of MAC-E filter type. It will investigate the neutrino rest mass with 0.2 eV/c (90% C.L.) sensitivity and allow ? spectroscopy close to the T endpoint at 18.6 keV with unprecedented precision.

  5. Solid electron sources for the energy scale monitoring in the KATRIN experiment

    E-print Network

    Zbo?il, Miroslav; Vénos, D

    The KArlsruhe TRItium Neutrino (KATRIN) experiment represents a next-generation tritium $\\beta$-decay experiment designed to perform a high precision direct measurement of the electron antineutrino mass m($\

  6. Recent RF activities on JT-60U

    SciTech Connect

    Ikeda, Y.; Fujita, T.; Hamamatus, K.; Ide, S.; Imai, T.; Isayama, A.; Iwase, M.; Kasugai, A.; Kondoh, T.; Kusama, Y.; Moriyama, S.; Naito, O.; Nemoto, M.; Oikawa, T.; Sakamoto, K.; Seki, M.; Shinozaki, S.; Simono, M.; Takahashi, T.; Terakado, M. [Japan Atomic Energy Research Institute, Naka Fusion Research Establishment Mukoyama 801-1, Naka-machi, Naka-gun, Ibaraki-ken, 311-0193 (Japan)] (and others)

    1999-09-20

    Recently, the JT-60U has employed ECRF system in addition to LHCD and ICRF systems. Three types of RF experiments on JT-60U have been performed. A reversed magnetic shear (R/S) configuration with internal transport barrier (ITB) was successfully maintained for 4.7 s in a quasi-steady state by LHCD in addition to the bootstrap current, where all profiles of temperature and plasma current were almost stationary. On the normal operation without heating during plasma current ramp-up, high electron temperature (T{sub e0}{approx}10 keV) with a strongly peaked profile was produced by LHCD alone at the density of {approx}0.5x10{sup 19} m{sup -3}. This peaked temperature profile was featured by a reduction in core density. The central electron temperature and density slowly changed in several seconds. The performances of ICRF (2{omega}{sub CH}) on the R/S configuration were also studied. Degradation of confinement of energetic particles was observed probably due to the large banana orbit loss. An 110 GHz ECRF system has been operated on JT-60U. Its gyrotron has successfully generated power at the level of up to 830 kW for 300 ms and is under conditioning. On the initial operation, the power of 620 kW was injected into plasmas. The central electron temperature increased from 3 keV to 5.5 keV at n{sub e}{approx}0.6x10{sup 19} m{sup -3}. A controllability of local heating was also demonstrated by the poloidally steerable mirror.

  7. Status and commissioning of the Karlsruhe tritium neutrino experiment KATRIN

    NASA Astrophysics Data System (ADS)

    Thuemmler, Thomas; Katrin Collaboration

    2013-10-01

    Neutrino properties, and especially the determination of the neutrino rest mass, play an important role at the intersections of cosmology, particle physics and astroparticle physics. At present there are two complementary approaches to address this topic in laboratory experiments. The search for neutrinoless double ? decay probes whether neutrinos are Majorana particles and determines an effective neutrino mass value. Experiments based on single ? decay investigate electrons close to their kinematic endpoint in order to determine the neutrino mass by a modelindependent method. The KArlsruhe TRItium Neutrino experiment (KATRIN) is currently the experiment in the most advanced status of commissioning. Applying an ultra-luminous molecular windowless gaseous tritium source and an integrating high-resolution spectrometer of MAC-E filter type, it allows ? spectroscopy close to the tritium endpoint with unprecedented precision and will reach a sensitivity of 200 meV/c2 (90% C.L.) on the neutrino mass.

  8. JT8D-100 turbofan engine, phase 1. [noise reduction

    NASA Technical Reports Server (NTRS)

    1974-01-01

    The JT8D turbofan engine, widely used in short and medium range transport aircraft, contributes substantially to airport community noise. The jet noise is predominant in the JT8D engine and may be reduced in a modified engine, without loss of thrust, by increasing the airflow to reduce jet velocity. A configuration study evaluated the effects of fan airflow, fan pressure ratio, and bypass ratio on noise, thrust, and fuel comsumption. The cycle selected for the modified engine was based upon an increased diameter, single-stage fan and two additional core engine compressor stages, which replace the existing two-stage fan. Modifications were also made to the low pressure turbine to provide the increased torque required by the larger diameter fan. The resultant JT8D-100 engine models have the following characteristics at take-off thrust, compared to the current JT8D engine: Airflow and bypass ratio are increased, and fan pressure ratio and engine speed are reduced. The resultant engine is also longer, larger in diameter, and heavier than the JT8D base model, but these latter changes are compensated by the increased thrust and decreased fuel comsumption of the modified engine, thus providing the capability for maintaining the performance of the current JT8D-powered aircraft.

  9. JT15D simulated flight data evaluation

    NASA Technical Reports Server (NTRS)

    Holm, R. G.

    1984-01-01

    The noise characteristics of the JT15D turbofan engine was analyzed with the objectives of: (1) assessing the state-of-art ability to simulate flight acoustic data using test results acquired in wind tunnel and outdoor (turbulence controlled) environments; and (2) predicting the farfield noise directivity of the blade passage frequency (BPF) tonal components using results from rotor blade mounted dynamic pressure instrumentation. Engine rotor tip speeds at subsonic, transonic, and supersonic conditions were evaluated. The ability to simulate flight results was generally within 2-3 dB for both outdoor and wind tunnel acoustic results. Some differences did occur in the broadband noise level and in the multiple-pure-tone harmonics at supersonic tip speeds. The prediction of blade passage frequency tone directivity from dynamic pressure measurements was accomplished for the three tip speed conditions. Predictions were made of the random and periodic components of the tone directivity. The technique for estimating the random tone component used hot wire data to establish a correlation between dynamic pressure and turbulence intensity. This prediction overestimated the tone level by typically 10 dB with the greatest overestimates occurring at supersonic conditions.

  10. Word stress correlates in spontaneous child-directed speech in German Katrin Schneider, Bernd Mobius

    E-print Network

    Schneider, Katrin

    Word stress correlates in spontaneous child-directed speech in German Katrin Schneider, Bernd M on the use of acoustic as well as voice quality parameters to mark word stress in German. Our aim was to identify the speech parameters parents use to indicate word stress differences to their children. Therefore

  11. La taxation nergie-climat en Sude Katrin Millock, Ph.D.

    E-print Network

    Paris-Sud XI, Université de

    1 La taxation énergie-climat en Suède Katrin Millock, Ph.D. Paris School of Economics, CNRS Centre "Droit de l'environnement, 175 (2010) xx-xx" #12;2 La taxation énergie-climat en Suède 1. Introduction La à l'échec de coordination sur une taxe énergie au niveau européen. Le régime suédois de taxation

  12. CROSS-DIALECTAL ACOUSTIC DATA SHARING FOR ARABIC SPEECH RECOGNITION Katrin Kirchhoff

    E-print Network

    Kirchhoff, Katrin

    are spoken languages; very little written dialectal material exists. This is a serious prob- lemCROSS-DIALECTAL ACOUSTIC DATA SHARING FOR ARABIC SPEECH RECOGNITION Katrin Kirchhoff Department Park, CA, USA ABSTRACT The automatic recognition of Arabic dialectal speech is a challenging task since

  13. Threads in the HACC cosmology framework Salman Habib, Katrin Heitmann, Adrian Pope, Vitali Morozov, et al.

    E-print Network

    Kemner, Ken

    Threads in the HACC cosmology framework Hal Finkel Salman Habib, Katrin Heitmann, Adrian Pope, 2013 1 / 14 #12;Cosmology (graphic by: NASA/WMAP Science Team) Hal Finkel (Argonne National Laboratory? Cosmology is the study of the universe on the largest measurable scales. Dark matter and dark energy compose

  14. Measurement and reduction of low-level radon background in the KATRIN experiment

    NASA Astrophysics Data System (ADS)

    Fränkle, F. M.

    2013-08-01

    The KArlsruhe TRItium Neutrino (KATRIN) experiment is a next generation, model independent, large scale experiment to determine the mass of the electron anti-neutrino by investigating the kinematics of tritium beta decay with a sensitivity of 200 meV/c2. The measurement setup consists of a high luminosity windowless gaseous molecular tritium source (WGTS), a differential and cryogenic pumped electron transport and tritium retention section, a tandem spectrometer section (pre-spectrometer and main spectrometer) for energy analysis, followed by a detector system for counting transmitted beta decay electrons. Measurements performed at the KATRIN pre-spectrometer test setup showed that the decay of radon (Rn) atoms in the volume of the KATRIN spectrometers is a major background source. Rn atoms from low-level radon emanation of materials inside the vacuum region of the KATRIN spectrometers are able to penetrate deep into the magnetic flux tube so that the alpha decay of Rn contributes to the background. Of particular importance are electrons emitted in processes accompanying the Rn alpha decay, such as shake-off, internal conversion of excited levels in the Rn daughter atoms and Auger electrons. Lowenergy electrons (< 100 eV) directly contribute to the background in the signal region. High-energy electrons can be stored magnetically inside the volume of the spectrometer and are able to create thousands of secondary electrons via subsequent ionization processes with residual gas molecules. In order to reduce the Rn induced background different active and passive counter measures were developed and tested. This proceeding will give an overview on Rn sources within the KATRIN spectrometer, describes how Rn decays inside the spectrometer produce background events at the detector and presents different counter measures to reduce the Rn induced background.

  15. Measurement and reduction of low-level radon background in the KATRIN experiment

    SciTech Connect

    Fränkle, F. M. [F.M. Fränkle Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC (United States)] [F.M. Fränkle Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC (United States)

    2013-08-08

    The KArlsruhe TRItium Neutrino (KATRIN) experiment is a next generation, model independent, large scale experiment to determine the mass of the electron anti-neutrino by investigating the kinematics of tritium beta decay with a sensitivity of 200 meV/c{sup 2}. The measurement setup consists of a high luminosity windowless gaseous molecular tritium source (WGTS), a differential and cryogenic pumped electron transport and tritium retention section, a tandem spectrometer section (pre-spectrometer and main spectrometer) for energy analysis, followed by a detector system for counting transmitted beta decay electrons. Measurements performed at the KATRIN pre-spectrometer test setup showed that the decay of radon (Rn) atoms in the volume of the KATRIN spectrometers is a major background source. Rn atoms from low-level radon emanation of materials inside the vacuum region of the KATRIN spectrometers are able to penetrate deep into the magnetic flux tube so that the alpha decay of Rn contributes to the background. Of particular importance are electrons emitted in processes accompanying the Rn alpha decay, such as shake-off, internal conversion of excited levels in the Rn daughter atoms and Auger electrons. Lowenergy electrons (< 100 eV) directly contribute to the background in the signal region. High-energy electrons can be stored magnetically inside the volume of the spectrometer and are able to create thousands of secondary electrons via subsequent ionization processes with residual gas molecules. In order to reduce the Rn induced background different active and passive counter measures were developed and tested. This proceeding will give an overview on Rn sources within the KATRIN spectrometer, describes how Rn decays inside the spectrometer produce background events at the detector and presents different counter measures to reduce the Rn induced background.

  16. 72562756 -1 -AES/jt2 July 23, 2013

    E-print Network

    Renewables Portfolio Standard Program. Rulemaking 11-05-005 (Filed May 5, 2011) ADMINISTRATIVE LAW JUDGE - i - Table of Contents Title Page ADMINISTRATIVE LAW JUDGE'S RULING REQUESTING COMMENTS ON STAFF of Proposed Methodology for Setting and Monitoring the PEL #12;R.11-05-005 AES/jt2 - 2 - ADMINISTRATIVE LAW

  17. Electron line shape and transmission function of the KATRIN monitor spectrometer

    SciTech Connect

    Slezák, M. [Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 12116 Prague, Czech Republic and Nuclear Physics Institute, Academy of Sciences of the Czech Republic, Hlavní 130, 25068 ?ež (Czech Republic)

    2013-12-30

    Knowledge of the neutrino mass is of particular interest in modern neutrino physics. Besides the neutrinoless double beta decay and cosmological observation information about the neutrino mass is obtained from single beta decay by observing the shape of the electron spectrum near the endpoint. The KATRIN ? decay experiment aims to push the limit on the effective electron antineutrino mass down to 0.2 eV/c{sup 2}. To reach this sensitivity several systematic effects have to be under control. One of them is the fluctuations of the absolute energy scale, which therefore has to be continuously monitored at very high precision. This paper shortly describes KATRIN, the technique for continuous monitoring of the absolute energy scale and recent improvements in analysis of the monitoring data.

  18. Tests of by-pass diodes at cryogenic temperatures for the KATRIN magnets

    SciTech Connect

    Gil, W. [Karlsruhe Institute of Technology, ITEP, Hermann-von-Helmholtz-Platz 1, D-76344, Eggenstein-Leopoldshafen (Germany); Bolz, H.; Jansen, A.; Müller, K.; Steidl, M. [Karlsruhe Institute of Technology, IKP, Hermann-von-Helmholtz-Platz 1, D-76344, Eggenstein-Leopoldshafen (Germany); Hagedorn, D. [CERN, TE-MPE, 1211 Geneva 23 (Switzerland)

    2014-01-27

    The Karlsruhe Tritium Neutrino experiment (KATRIN) requires a series of superconducting solenoid magnets for guiding beta-electrons from the source to the detector. By-pass diodes will operate at liquid helium temperatures to protect the superconducting magnets and bus bars in case of quenches. The operation conditions of the by-pass diodes depend on the different magnet systems of KATRIN. Therefore, different diode stacks are designed with adequate copper heat sinks assuming adiabatic conditions. The by-pass diode stacks have been submitted to cold tests both at liquid nitrogen and liquid helium temperatures for checking operation conditions. This report presents the test set up and first results of the diode characteristics at 300 K and 77 K, as well as of endurance tests of the diode stacks at constant current load at 77 K and 4.2 K.

  19. An efficient multi-stage Brayton–JT cycle for liquefaction of natural gas

    Microsoft Academic Search

    Ho-Myung Chang; Myung Jin Chung; Sanggyu Lee; Kun Hyung Choe

    2011-01-01

    Combined multi-stage Brayton–JT refrigeration cycles are investigated as a governmental effort in Korea to develop an original liquefaction process of natural gas in accordance with recent demand of higher efficiency and larger capacity. Based upon thermodynamic optimization theory, a combined refrigeration system is proposed with nitrogen (N2) Brayton cycle, ethylene (C2) JT cycle, and propane (C3) JT cycles, which are

  20. 1450 m^3 at 10^-9 Pa: One of the KATRIN Challenges

    SciTech Connect

    Christian Day; R. Gumbsheimer; W. Herz; J. Wolf; J. Bonn; R. Reid; G.R. Myneni

    2006-11-12

    The KATRIN project is a challenging experiment to measure the mass of the electron neutrino directly with a sensitivity of 0.2 eV. It is a next generation tritium beta-decay experiment scaling up the size and precision of previous experiments by an order of magnitude as well as the intensity of the tritium beta source. Ultrafine spectrometric analysis of the energy distribution of the decay electrons at their very endpoint of 18.57 keV is the key to derive the neutrino mass. This is provided by a high-resolution spectrometer of unique size (10 m in diameter, 22 m in length). To avoid any negative influence from residual gas, the spectrometer vessel is designed to UHV/XHV conditions (an ultimate total pressure of below 10{sup -9} Pa and a wall outgassing rate below 10{sup -13} Pam{sup 3}/scm{sup 2}). The paper shortly describes the experimental idea behind KATRIN. The emphasis will then be given to the pumping concept for how to achieve the target parameters and to the manufacturing of the spectrometer tank. Critical issues will also be discussed (surface treatment, welding, transportation). Finally, a description of the current status and an outlook on the overall KATRIN schedule completes the paper.

  1. Hydrogen retention of carbon dust produced in JT-60

    NASA Astrophysics Data System (ADS)

    Yoshida, H.; Yamauchi, Y.; Hirohata, Y.; Arai, T.; Suzuki, S.; Akiba, M.; Miya, N.; Hino, T.

    2005-03-01

    Hydrogen retention of dust produced by hydrogen discharges from June 1987 to October 1987 in JT-60 was measured to contribute for the estimation of in-vessel tritium inventory in the next generation of fusion reactor, such as ITER. After venting the vacuum chamber, several types of dust-like pieces, i.e. flake-like carbon dust, graphite, and metal pieces, were found in the vacuum vessel. The amount of retained hydrogen in flake-like carbon dust was two orders of magnitude larger than that in the graphite and metal pieces. However, the hydrogen concentration of flake-like carbon dust was 0.04 in the atomic ratio of H/C, which was one order of magnitude smaller than that of carbon flake produced in JET. One of possible explanations is the difference of the wall temperature between JT-60 and JET.

  2. LOW-RESOURCE NOISE-ROBUST FEATURE POST-PROCESSING ON AURORA 2.0 Chia-Ping Chen Jeff Bilmes Katrin Kirchhoff

    E-print Network

    Washington at Seattle, University of

    the insertion errors. In [6], nonlinear spectral subtrac- tion, noise masking, feature filters, and modelLOW-RESOURCE NOISE-ROBUST FEATURE POST-PROCESSING ON AURORA 2.0 Chia-Ping Chen Jeff Bilmes Katrin-2500 {chiaping,bilmes,katrin}@ee.washington.edu ABSTRACT We present a highly effective and extremely simple noise

  3. Results of acoustic testing of the JT8D-109 refan engines

    NASA Technical Reports Server (NTRS)

    Burdsall, E. A.; Brochu, F. P.; Scaramella, V. M.

    1975-01-01

    A JT8D engine was modified to reduce jet noise levels by 6-8 PNdB at takeoff power without increasing fan generated noise levels. Designated the JT8D-109, the modified engines featured a larger single stage fan, and acoustic treatment in the fan discharge ducts. Noise levels were measured on an outdoor test facility for eight engine/acoustic treatment configurations. Compared to the baseline JT8D, the fully treated JT8D-109 showed reductions of 6 PNdB at takeoff, and 11 PNdB at a typical approach power setting.

  4. Present status and future plan of JT-60 engineering

    Microsoft Academic Search

    M. Shimizu

    1989-01-01

    Since the completion of the JAERI Tokamak-60 (JT-60) tokamak machine and the NBI (neutral beam injection) and RF heating systems, various improvements have been made and new auxiliary systems have been installed. The approximately 8000 shots since the first plasma have yielded valuable operation and engineering experiences. Development of a high-speed pellet injector and a multijunction-type LH launcher has contributed

  5. Development and operation of JT-60 lhrf launchers

    Microsoft Academic Search

    Y. Ikeda; T. Imai; M. Seki; K. Sakamoto; K. Konishi; K. Kiyono; S. Maebara; T. Nagashima; O. Naito; M. Sawahata; N. Suganuma; N. Suzuki; K. Uehara; K. Ushigusa; M. Yokokura

    1991-01-01

    The JT-60 LHRF launcher was designed with broad frequency capability (1.74 to 2.23 GHz) to inject multi-megawatt, multi-second RF waves into plasmas. The launcher is characterized by 32 long vacuum waveguides of ? 8 m without front windows to avoid plasma bombardment of the ceramic windows in the large tokamak. The front of the launcher is of a detachable grill

  6. Design and fabrication of multijunction launcher on the JT-60

    Microsoft Academic Search

    K. Konishi; Y. Ikeda; M. Seki; T. Imai; M. Honda; K. Yokokura; M. Sawahata; M. Sato; K. Suganuma; K. Ushigusa; K. Uehara

    1989-01-01

    A multijunction-type launcher was installed on the JAERI (Japan Atomic Energy Research Institute) Tokamak-60 (JT-60). It is composed of 32 modules consisting of 96 secondary waveguides, in which E-plane junctions are used to divide each main waveguide into three secondary waveguides at its grill mouth. The waveguides are equipped with geometrical phase shifters yielding 70° of phase shift in order

  7. Improvement of the real-time processor in JT-60 data processing system

    Microsoft Academic Search

    S. Sakata; K. Kiyono; M. Sato; T. Kominato; M. Sueoka; H. Hosoyama; Y. Kawamata

    2009-01-01

    Real-time processor, RTP is a basic subsystem in the JT-60 data processing system and plays an important role in JT-60 feedback control for plasma experiment. During the experiment, RTP acquires various diagnostic signals, processes them into a form of physical values, and transfers them as sensor signals to the particle supply and heating control supervisor for feedback control via reflective

  8. Gaseous source of 83mKr conversion electrons for the neutrino experiment KATRIN

    NASA Astrophysics Data System (ADS)

    Vénos, D.; Slezák, M.; Dragoun, O.; Inoyatov, A.; Lebeda, O.; Pulec, Z.; Sentkerestiová, J.; Špalek, A.

    2014-12-01

    The metastable 83mKr with short half-life of 1.83 h is intended as a space distributed source of monoenergetic electrons for energy calibration and systematic studies in the Karlsruhe tritium neutrino experiment (KATRIN). The efficient production of the parent radionuclide 83Rb at cyclotron U-120M was implemented. The release of the 83mKr from zeolite (molecular sieve), in which the parent radionuclide 83Rb (T1/2 = 86.2 d) was trapped, was studied under various conditions using the gamma spectroscopy. Residual gas analysis of ultra high vacuum over the zeolite was performed as well.

  9. Improvement of JT-60U Negative Ion Source Performance

    SciTech Connect

    L.R. Grisham; M. Kuriyama; M. Kawai; T. Itoh; N. Umeda; JT-60U Team

    2000-11-15

    The negative ion neutral beam system now operating on JT-60U was the first application of negative ion technology to the production of beams of high current and power for conversion to neutral beams, and has successfully demonstrated the feasibility of negative ion beam heating systems for ITER and future tokamak reactors [1, 2]. It also demonstrated significant electron heating[3] and high current drive efficiency in JT-60U[4]. Because this was such a large advance in the state of the art with respect to all system parameters, many new physical processes appeared during the earlier phases of the beam injection experiments. We have explored the physical mechanisms responsible for these processes, and implemented solutions for some of them, in particular excessive beam stripping, the secular dependence of the arc and beam parameters, and nonuniformity of the plasma illuminating the beam extraction grid. This has reduced the percentage of beam heat loading on the downstream grids by roug hly a third, and permitted longer beam pulses at higher powers. Progress is being made in improving the negative ion current density, and in coping with the sensitivity of the cesium in the ion sources to oxidation by tiny air or water leaks, and the cathode operation is being altered.

  10. Photoluminescence of Colloidal CdSe/ZnS Quantum Dots: The Critical Effect of Water Katrin Pechstedt,

    E-print Network

    Steiner, Ullrich

    Photoluminescence of Colloidal CdSe/ZnS Quantum Dots: The Critical Effect of Water Molecules KatrinVed: June 2, 2010 An investigation of the photoinduced fluorescence enhancement (PFE) behavior of CdSe/ZnS, under oxygen or argon, is presented. The photoluminescence properties of CdSe/ZnS QDs are highly

  11. THE 2001 GMTK-BASED SPINE ASR SYSTEM Ozgur C etin, Harriet J. Nock, Katrin Kirchhoff, Jeff Bilmes, Mari Ostendorf

    E-print Network

    Washington at Seattle, University of

    THE 2001 GMTK-BASED SPINE ASR SYSTEM ¨Ozg¨ur C¸ etin, Harriet J. Nock, Katrin Kirchhoff, Jeff of Washington automatic speech recognition (ASR) system for the 2001 DARPA SPeech In Noisy Environments (SPINE SPINE system, GMTK was used for acoustic model training whereas feature extraction, speaker adaptation

  12. THE 2001 GMTKBASED SPINE ASR SYSTEM Ozg ur C etin, Harriet J. Nock, Katrin Kirchhoff, Jeff Bilmes, Mari Ostendorf

    E-print Network

    Bilmes, Jeff

    THE 2001 GMTK­BASED SPINE ASR SYSTEM Ë? OzgË? ur Câ?º etin, Harriet J. Nock, Katrin Kirchhoff, Jeff of Washington automatic speech recognition (ASR) system for the 2001 DARPA SPeech In Noisy Environments (SPINE SPINE system, GMTK was used for acoustic model training whereas feature extraction, speaker adaptation

  13. JT8D high pressure compressor performance improvement

    NASA Technical Reports Server (NTRS)

    Gaffin, W. O.

    1981-01-01

    An improved performance high pressure compressor with potential application to all models of the JT8D engine was designed. The concept consisted of a trenched abradable rubstrip which mates with the blade tips for each of the even rotor stages. This feature allows tip clearances to be set so blade tips run at or near the optimum radius relative to the flowpath wall, without the danger of damaging the blades during transients and maneuvers. The improved compressor demonstrated thrust specific fuel consumption and exhaust gas temperature improvements of 1.0 percent and at least 10 C over the takeoff and climb power range at sea level static conditions, compared to a bill-of-material high pressure compressor. Surge margin also improved 4 percentage points over the high power operating range. A thrust specific fuel consumption improvement of 0.7 percent at typical cruise conditions was calculated based on the sea level test results.

  14. Design, R&D and assessment of performance of the JT-60SA upper divertor

    Microsoft Academic Search

    Shinji Sakurai; Hisato Kawashima; Satoru Higashijima; Katsuhiro Shimizu; Kei Masaki; Nobuyuki Asakura; Yusuke K. Shibama; Akira Sakasai

    2009-01-01

    Modification of JT-60 to a fully superconducting coil tokamak (JT-60 Super Advanced) has been started last year. Divertor plasma performance for high triangularity and low aspect ratio plasma in two types of divertor geometries was studied and compared by using 2D plasma fluid (SOLDOR) and neutral Monte-Carlo (NEUT2D) codes. ‘Vertical target with deep V corner’ is effective to reduce heat

  15. Simulation of background from low-level tritium and radon emanation in the KATRIN spectrometers

    NASA Astrophysics Data System (ADS)

    Leiber, B.; Katrin Collaboration

    2013-08-01

    The KArlsruhe TRItium Neutrino (KATRIN) experiment is a large-scale experiment for the model independent determination of the mass of electron anti-neutrinos with a sensitivity of 200 meV/c2. It investigates the kinematics of electrons from tritium beta decay close to the endpoint of the energy spectrum at 18.6 keV. To achieve a good signal to background ratio at the endpoint, a low background rate below 10-2 counts per second is required. The KATRIN setup thus consists of a high luminosity windowless gaseous tritium source (WGTS), a magnetic electron transport system with differential and cryogenic pumping for tritium retention, and electro-static retarding spectrometers (pre-spectrometer and main spectrometer) for energy analysis, followed by a segmented detector system for counting transmitted beta-electrons. A major source of background comes from magnetically trapped electrons in the main spectrometer (vacuum vessel: 1240 m3, 10-11 mbar) produced by nuclear decays in the magnetic flux tube of the spectrometer. Major contributions are expected from short-lived radon isotopes and tritium. Primary electrons, originating from these decays, can be trapped for hours, until having lost almost all their energy through inelastic scattering on residual gas particles. Depending on the initial energy of the primary electron, up to hundreds of low energetic secondary electrons can be produced. Leaving the spectrometer, these electrons will contribute to the background rate. This contribution describes results from simulations for the various background sources. Decays of 219Rn, emanating from the main vacuum pump, and tritium from the WGTS that reaches the spectrometers are expected to account for most of the background. As a result of the radon alpha decay, electrons are emitted through various processes, such as shake-off, internal conversion and the Auger deexcitations. The corresponding simulations were done using the KASSIOPEIA framework, which has been developed for the KATRIN experiment for low-energy electron tracking, field calculation and detector simulation. The results of the simulations have been used to optimize the design parameters of the vacuum system with regard to radon emanation and tritium pumping, in order to reach the stringent requirements of the neutrino mass measurement.

  16. Simulation of background from low-level tritium and radon emanation in the KATRIN spectrometers

    SciTech Connect

    Leiber, B. [Institute for Nuclear Physics (IKP), Karlsruhe Institute of Technology (KIT), 76021 Karlsruhe (Germany)] [Institute for Nuclear Physics (IKP), Karlsruhe Institute of Technology (KIT), 76021 Karlsruhe (Germany); Collaboration: KATRIN Collaboration

    2013-08-08

    The KArlsruhe TRItium Neutrino (KATRIN) experiment is a large-scale experiment for the model independent determination of the mass of electron anti-neutrinos with a sensitivity of 200 meV/c{sup 2}. It investigates the kinematics of electrons from tritium beta decay close to the endpoint of the energy spectrum at 18.6 keV. To achieve a good signal to background ratio at the endpoint, a low background rate below 10{sup ?2} counts per second is required. The KATRIN setup thus consists of a high luminosity windowless gaseous tritium source (WGTS), a magnetic electron transport system with differential and cryogenic pumping for tritium retention, and electro-static retarding spectrometers (pre-spectrometer and main spectrometer) for energy analysis, followed by a segmented detector system for counting transmitted beta-electrons. A major source of background comes from magnetically trapped electrons in the main spectrometer (vacuum vessel: 1240 m{sup 3}, 10{sup ?11} mbar) produced by nuclear decays in the magnetic flux tube of the spectrometer. Major contributions are expected from short-lived radon isotopes and tritium. Primary electrons, originating from these decays, can be trapped for hours, until having lost almost all their energy through inelastic scattering on residual gas particles. Depending on the initial energy of the primary electron, up to hundreds of low energetic secondary electrons can be produced. Leaving the spectrometer, these electrons will contribute to the background rate. This contribution describes results from simulations for the various background sources. Decays of {sup 219}Rn, emanating from the main vacuum pump, and tritium from the WGTS that reaches the spectrometers are expected to account for most of the background. As a result of the radon alpha decay, electrons are emitted through various processes, such as shake-off, internal conversion and the Auger deexcitations. The corresponding simulations were done using the KASSIOPEIA framework, which has been developed for the KATRIN experiment for low-energy electron tracking, field calculation and detector simulation. The results of the simulations have been used to optimize the design parameters of the vacuum system with regard to radon emanation and tritium pumping, in order to reach the stringent requirements of the neutrino mass measurement.

  17. KATRIN: an experiment to determine the neutrino mass from the beta decay of tritium

    E-print Network

    ,

    2013-01-01

    KATRIN is a very large scale tritium-beta-decay experiment to determine the mass of the neutrino. It is presently under construction at the Karlsruhe Institute of Technology north campus, and makes use of the Karlsruhe Tritium Laboratory built as a prototype for the ITER project. The combination of a large retarding-potential electrostatic-magnetic spectrometer and an intense gaseous molecular tritium source makes possible a sensitivity to neutrino mass of 0.2 eV, about an order of magnitude below present laboratory limits. The measurement is kinematic and independent of whether the neutrino is Dirac or Majorana. The status of the project is summarized briefly in this report.

  18. Status of the KATRIN Experiment and Prospects to Search for keV-mass Sterile Neutrinos in Tritium ?-decay

    NASA Astrophysics Data System (ADS)

    Mertens, Susanne

    In this contribution the current status and future perspectives of the Karlsruhe Tritium Neutrino (KATRIN) Experiment are presented. The prime goal of this single ?-decay experiment is to probe the absolute neutrino mass scale with a sensitivity of 200 meV (90% CL). We discuss first results of the recent main spectrometer commissioning measurements, successfully verifying the spectrometer's basic vacuum, transmission and background properties. We also discuss the prospects of making use of the KATRIN tritium source, to search for sterile neutrinos in the multi-keV mass range constituting a classical candidate for Warm Dark Matter. Due to the very high source luminosity, a statistical sensitivity down to active-sterile mixing angles of sin2? < 1 . 10-7 (90% CL) could be reached.

  19. Mass data acquisition systems in JT-60 data processing system

    NASA Astrophysics Data System (ADS)

    Oshima, T.; Matsuda, T.; Tsugita, T.; Sakata, S.; Sato, M.; Koiwa, M.

    2001-01-01

    In the data processing system for the JT-60 tokamak, a unique mass data acquisition system with fast sampling, a transient mass data storage system (TMDS), has been used since 1988. It is composed of a minicomputer and 61 channels of 4/6 MB memory modules with a sampling rate up to 200 kHz and about 300 MB of data are transferred to a main computer by using a special LAN developed by Fujitsu Ltd. TMDS can handle a large amount of data, but cannot be enlarged in its capability, such as CPU power or the number of channels. To solve the problems of TMDS, a new fast VME data acquisition system (FDS), has been developed. It can acquire 6 MB of data per channel with a sampling rate of 200 kHz or 1 MHz and consists of a workstation with VMEbus memory modules. Up to now there are three FDSs with 24 channels. The minicomputer of TMDS has been replaced with a new system based on the technology of FDS. To cope with mass data transfer to a data server, they are connected with a gigabit ethernet switch.

  20. Oxygen chemisorption compressor study for cryogenic J-T refrigeration

    NASA Technical Reports Server (NTRS)

    Jones, Jack A.; Blue, Gary D.

    1987-01-01

    Over twenty potentially reversible heat-powered oxide reactions have been studied and/or tested to determine their potential use as thermochemical oxygen compressors for cryogenic J-T LO2 refrigerators. One gas-solid compound family, Pr(1-n)Ce(n)O(x), proved to be completely reversible with fast kinetics for all pressure ranges tested below 650 C. With a heat-powered charcoal/methane physical adsorption upper stage and a Pr(1-n)Ce(n)O(x) chemisorption lower stage, temperatures should be attainable in the 55-80 K range for less power and over five times less weight than for charcoal/nitrogen sorption refrigeration systems. Total system power requirements with a hydride chemisorption lower stage (10 K to 7 K minimum) are about three times less than any mechanical refrigerator, and spacecraft refrigeration weights are about twenty times less. Due to the lack of wear-related moving parts in sorption refrigerators, life expectancy is at least ten years, and there essentially no vibration.

  1. Present knowledge about the materials behavior in JT-60

    NASA Astrophysics Data System (ADS)

    Takatsu, H.; Ando, T.; Yamamoto, M.; Arai, T.; Kodama, K.; Ohkubo, M.; Shimizu, M.

    1988-07-01

    JT-60 first walls were originally composed of a number of tiles made of either molybdenum or Inconel 625 with 20 ?m thick TiC coating. These first walls, operated after the bakeout at a temperature of 350°C, provided very clean surfaces as well as superior plasma characteristics during Joule heating discharges. Damage of the TiC-coated first walls was modest and localized to specific spots. However, initial results of the additional heating experiments showed degrading effects of locally melted TiC-coated molybdenum and Inconel 625 on the plasma operation. During the venting period from April to May '87 about half of the TiC-coated molybdenum and Inconel 625 was replaced by graphite first walls to prepare for high-power and long-pulse additional heating experiments. After a three-day 300 °c bakeout, 30 h glow discharge cleaning, and 16 h pulsed discharge cleaning at a vessel temperature of around 250°C, a very rapid start-up of the discharge conditioning with plasma current up to 1.0 MA was achieved with 14 shots. Flexibility in plasma operation was increased and the plasma current was increased to 2.9 MA.

  2. Status and prospect of JT-60 plasma control and diagnostic data processing systems for advanced operation scenarios

    Microsoft Academic Search

    K. Kurihara; I. Yonekawa; Y. Kawamata; M. Sueoka; H. Hosoyama; S. Sakata; T. Ohshima; M. Sato; K. Kiyono

    2006-01-01

    The large tokamak fusion device JT-60 is expected to explore more advanced tokamak discharge scenarios toward the ITER and a future power reactor. Since various experimental issues are to be adequately discussed, and possibly to be solved in JT-60, the plasma real-time control system has been drastically improved with remodelling in hardware as well as in software. To satisfy the

  3. An efficient multi-stage Brayton-JT cycle for liquefaction of natural gas

    NASA Astrophysics Data System (ADS)

    Chang, Ho-Myung; Chung, Myung Jin; Lee, Sanggyu; Choe, Kun Hyung

    2011-06-01

    Combined multi-stage Brayton-JT refrigeration cycles are investigated as a governmental effort in Korea to develop an original liquefaction process of natural gas in accordance with recent demand of higher efficiency and larger capacity. Based upon thermodynamic optimization theory, a combined refrigeration system is proposed with nitrogen (N2) Brayton cycle, ethylene (C2) JT cycle, and propane (C3) JT cycles, which are used for cooling the feed gas in a series of heat exchangers. Since no mixed refrigerants are used, this system is simple in operation and robust in reliability. A complete cycle design is presented to confirm its feasibility and estimate the liquefaction performance. It is expected that the proposed N2-C2-C3 cycle could have a reasonably high efficiency and the potential of great liquefaction capacity. Next steps are underway for patent application and practical process development.

  4. Imaging plate technique for determination of tritium distribution on graphite tiles of JT-60U

    NASA Astrophysics Data System (ADS)

    Tanabe, T.; Miyasaka, K.; Masaki, K.; Kodama, K.; Miya, N.

    2002-12-01

    The tritium imaging plate technique was applied to determine surface tritium distributions on graphite tiles used as the first wall and W-shaped divertor in JT-60U, in which tritium produced by the D-D nuclear reaction in the plasma was implanted and/or deposited depending on the incident energy. Measured samples were isotropic graphite (IG-430U) and CFC graphite (CX-2002U), used as divertor tiles and/or baffle plates just outside the divertor. Tritium areal distributions on graphite divertor tiles, dome units and baffle plates of JT-60U were successfully measured for the first time. Tritium distributions observed in JT-60U tiles can be explained by homogeneous implantation of high energy tritium which is influenced by redeposited layers and redistributed by the temperature increase due to the plasma heat load. The tritium retention in graphite heated above 800 K was significantly small.

  5. Pollution reduction technology program for class T4(JT8D) engines

    NASA Technical Reports Server (NTRS)

    Roberts, R.; Fiorentino, A. J.; Diehl, L. A.

    1977-01-01

    The technology required to develop commercial gas turbine engines with reduced exhaust emissions was demonstrated. Can-annular combustor systems for the JT8D engine family (EPA class T4) were investigated. The JT8D turbofan engine is an axial-flow, dual-spool, moderate-bypass-ratio design. It has a two-stage fan, a four-stage low-pressure compressor driven by a three-stage low-pressure turbine, and a seven-stage high-pressure compressor driven by a single-stage high-pressure turbine. A cross section of the JT8D-17 showing the mechanical configuration is given. Key specifications for this engine are listed.

  6. High power operation of Gaussian beam gyrotron with CVD diamond window for JT-60U

    NASA Astrophysics Data System (ADS)

    Kasugai, Atsushi; Takahashi, Koji; Sakamoto, Keishi; Kariya, Tsuyoshi; Mitsunaka, Yoshika; Ikeda, Yukiharu; Ikeda, Yoshitaka; Tsuneoka, Masaki; Imai, Tsuyoshi

    1999-09-01

    A 110 GHz-Gaussian beam output gyrotron with CVD (Chemical Vapor Deposition) diamond window was developed for the electron cyclotron heating and current drive on JT-60U. A stable Gaussian output beam power of 1.1 MW-0.1 s was obtained with the efficiency of 39% with depressed collector operation. Due to Gaussian beam output from the gyrotron, the coupling efficiency to HE11 mode in the mirror optical unit was 94%. Moreover, the transmission efficiency of 89% for HE11 mode was performed at the power level of 1 MW on the 40 m-transmission test line of ?31.751 mm corrugated waveguide and 8-miter bends included 1-pair of polarizer. The gyrotron and transmission line were installed into JT-60U system and 0.6 MW-0.3 s power was successfully injected into JT-60U plasmas as an initial operation.

  7. Development of a cryogenic mixed fluid J-T cooling computer code, 'JTMIX'

    NASA Technical Reports Server (NTRS)

    Jones, Jack A.

    1991-01-01

    An initial study was performed for analyzing and predicting the temperatures and cooling capacities when mixtures of fluids are used in Joule-Thomson coolers and in heat pipes. A computer code, JTMIX, was developed for mixed gas J-T analysis for any fluid combination of neon, nitrogen, various hydrocarbons, argon, oxygen, carbon monoxide, carbon dioxide, and hydrogen sulfide. When used in conjunction with the NIST computer code, DDMIX, it has accurately predicted order-of-magnitude increases in J-T cooling capacities when various hydrocarbons are added to nitrogen, and it predicts nitrogen normal boiling point depressions to as low as 60 K when neon is added.

  8. Monitoring of the properties of the KATRIN Windowless Gaseous Tritium Source

    E-print Network

    Babutzka, M; Bonn, J; Bornschein, B; Dieter, A; Drexlin, G; Eitel, K; Fischer, S; Glück, F; Grohmann, S; Hötzel, M; James, T M; Käfer, W; Leber, M; Monreal, B; Priester, F; Röllig, M; Schlösser, M; Schmitt, U; Sharipov, F; Steidl, M; Sturm, M; Telle, H H; Titov, N

    2012-01-01

    The Karlsruhe Tritium Neutrino (KATRIN) experiment will measure the absolute mass scale of neutrinos with a sensitivity of \\mnu = 200 meV/c$^2$ by high-precision spectroscopy close to the tritium \\beta-decay endpoint at 18.6 keV. Its Windowless Gaseous Tritium Source (WGTS) is a \\beta-decay source of high intensity ($10^{11}$/s) and stability, where high-purity molecular tritium at 30 K is circulated in a closed loop with a yearly throughput of 10 kg. To limit systematic effects the column density of the source has to be stabilised at the 0.1% level. This requires extensive sensor instrumentation and dedicated control and monitoring systems for parameters such as the beam tube temperature, injection pressure, gas composition and others. Here we give an overview of these systems including a dedicated Laser-Raman system as well as several \\beta-decay activity monitors. We also report on results of the WGTS demonstrator and other large-scale test experiments giving proof-of-principle that all parameters relevant...

  9. Hydrogen\\/deuterium recycling and initial results of helium ash study in JT-60U

    Microsoft Academic Search

    H. Nakamura; A. Sakasai; M. Shimada; R. Yoshino; T. Arai; T. Fukuda; T. Hirayama; N. Hosogane; S. Ishida; A. Kaminaga; Y. Koide; H. Kubo; T. Nishitani; T. Sugie

    1992-01-01

    Reduction of particle recycling is an important technique in present plasma devices to improve energy confinement characteristics. Besides obtaining long pulse DT burning plasmas, controlled fuelling of the plasma with the primary species and removal of the helium ash are important issues. In the JT-60U tokamak, about 90% of the inner surface is covered with graphite tiles. Because recycling becomes

  10. RINGS OF DIFFERENTIAL OPERATORS ON CLASSICAL RINGS OF INVARIANTS T. Levasseur and J.T. Stafford

    E-print Network

    Levasseur, Thierry

    RINGS OF DIFFERENTIAL OPERATORS ON CLASSICAL RINGS OF INVARIANTS by T. Levasseur and J.T. Stafford #12;to Shimshon A. Amitsur #12;ABSTRACT We consider rings of differential operators over the classical) all antisymmetric n × n matrices of rank 2k . We prove that the ring of differential operators D

  11. RINGS OF DIFFERENTIAL OPERATORS ON CLASSICAL RINGS OF INVARIANTS T. Levasseur and J.T. Stafford

    E-print Network

    Levasseur, Thierry

    RINGS OF DIFFERENTIAL OPERATORS ON CLASSICAL RINGS OF INVARIANTS by T. Levasseur and J.T. Stafford #12; to Shimshon A. Amitsur #12; ABSTRACT We consider rings of di#11;erential operators over the classical rings of invariants, in the sense of Weyl [We]. Thus, let X k be one of the following varieties

  12. First measurement of time-resolved neutron yield on JT-60U using a microfission chamber

    Microsoft Academic Search

    T. Hayashi; T. Nishitani; M. Ishikawa

    2004-01-01

    Microfission chambers, which are pencil sized ionization chamber containing fissile material inside, will be installed in the vacuum vessel as neutron monitors for International Thermonuclear Experimental Reactor (ITER). We have performed first measurements of the detector installed between the vacuum vessel and toroidal coils on JT-60U. The technical validity as a neutron monitor, such as magnetic field effect and electromagnetic

  13. Stability of the toroidicity-induced Alfven eigenmodes in JT-60U ICRF experiments

    SciTech Connect

    Fu, G.Y.; Cheng, C.Z. [Princeton Univ., NJ (United States). Plasma Physics Lab.; Kimura, H.; Ozeki, T.; Saigusa, M. [Japan Atomic Energy Research Inst., Naka, Ibaraki (Japan). Naka Fusion Research Establishment

    1996-04-01

    It is shown that the stability of toroidicity-induced Alfven eigenmodes (TIE) in JT-60U ICRF experiments is strongly dependent on mode location. This dependence results in sequential excitation of high-n TIE modes as the central safety factor, q, drops in time.

  14. DC-9 flight demonstration program with refanned JT8D engines. Volume 1: Summary

    NASA Technical Reports Server (NTRS)

    1975-01-01

    The design, analysis, fabrication, and ground and flight testing of DC-9 airframe/nacelle hardware with prototype JT8D-109 engines are discussed. The installation of the JT8D-109 engine on the DC-9 Refan airplane required new or modified hardware for the pylon, nacelle, and fuselage. The acoustic material used in the nose cowl was bonded aluminum honeycomb sandwich and the exhaust duct acoustic material was Inconel 625 Stresskin. The sea level static, standard day bare engine takeoff thrust, the cruise TSFC and the maximum available cruise thrust for the JT8D-109 engine were compared with those of the JT8D-9 engine. The range capabilities of the DC-9 Refan and the production DC-9 airplane were also compared. The Refan airplane demonstrated flight characteristics similar to the production DC-9-30 and satisfied airworthiness requirements. Flyover noise levels were determined for the DC-9 Refan and the DC-9 C-9A airplane for takeoff and landing conditions. Cost estimates were also made.

  15. 244 e) JL Jt MOSQUITO NEWS VOL. 39, No. RECENT DISTRIBUTION RECORDS OF CULEX TARSALIS

    E-print Network

    244 e) JL Jt MOSQUITO NEWS VOL. 39, No. RECENT DISTRIBUTION RECORDS OF CULEX TARSALIS IN NEW JERSEY Commission, Box 327, Barnegat, NJ 08005 ABSTRACT. Culex tarsalis Coquillett, which first collected in New sepa- INTRODUCTION Culex tarsalis Coquillett is important mosquito in the and central United Stales

  16. Monitoring of tritium purity during long-term circulation in the KATRIN test experiment LOOPINO using laser Raman spectroscopy

    E-print Network

    Fischer, Sebastian; Schlösser, Magnus; Bornschein, Beate; Drexlin, Guido; Priester, Florian; Lewis, Richard J; Telle, Helmut H

    2012-01-01

    The gas circulation loop LOOPINO has been set up and commissioned at Tritium Laboratory Karlsruhe (TLK) to perform Raman measurements of circulating tritium mixtures under conditions similar to the inner loop system of the neutrino-mass experiment KATRIN, which is currently under construction. A custom-made interface is used to connect the tritium containing measurement cell, located inside a glove box, with the Raman setup standing on the outside. A tritium sample (purity > 95%, 20 kPa total pressure) was circulated in LOOPINO for more than three weeks with a total throughput of 770 g of tritium. Compositional changes in the sample and the formation of tritiated and deuterated methanes CT_(4-n)X_n (X=H,D; n=0,1) were observed. Both effects are caused by hydrogen isotope exchange reactions and gas-wall interactions, due to tritium {\\beta} decay. A precision of 0.1% was achieved for the monitoring of the T_2 Q_1-branch, which fulfills the requirements for the KATRIN experiment and demonstrates the feasibility ...

  17. Noninductive Current Drive and Steady-State Operation in JT-60U

    SciTech Connect

    Ushigusa, K.; Ide, S.; Oikawa, T.; Suzuki, T.; Kamada, Y.; Fujita, T.; Ikeda, Y.; Naito, O.; Matsuoka, M.; Kondoh, T.; Isayama, A.; Seki, M.; Imai, T.; Sakamoto, K.; Umeda, N.; Hamamatsu, K.; Fujii, T.; Uehara, K.; Yamamoto, T.; Miura, Y.; Kikuchi, M.; Kuriyama, M.; Ninomiya, H. [Japan Atomic Energy Research Institute (Japan)

    2002-09-15

    Studies on noninductive current drive (CD) and development of an integrated steady-state high performance operation in JT-60 are reviewed. Experiments on lower hybrid current drive (LHCD) in JT-60 have shown a large noninductive current up to 3.6 MA, high current drive efficiency of 3.5 x 10{sup 19} m{sup -2}A/W, and a flexible current profile control. Basic studies on LH waves, such as an effect of accessibility condition, fast electron behaviors, and so on, in JT-60 have contributed to understanding LHCD physics. Significant progress in neutral beam current drive (NBCD) has been made in JT-60 by testing the performance of negative ion-based (N) neutral beam injection (NBI) (N-NBI). The CD efficiency of {approx}1.5 x 10{sup 19} m{sup -2}A/W and negative ion-based neutral beam (N-NB) driven current of {approx}1 MA have been demonstrated in N-NBCD. Strongly localized noninductive driven current by electron cyclotron current drive (ECCD) was identified with a fundamental O-mode scheme from a low field side injection. ECCD in JT-60 has shown CD efficiency of 0.5 x 10{sup 19} m{sup -2}A/W and EC-driven current of 0.2 MA. Modification of local current profile was demonstrated and was used for suppression of neoclassical tearing mode. Based on these developments, two integrated steady-state operation scenarios were developed in JT-60, which are reversed magnetic shear (R/S) plasmas and high {beta}p ELMy H-mode. In these operation regimes, discharges have been sustained near the steady-state current profile under full noninductive current drive (High {beta}p; HH{sub y2} {approx} 1.4 and {beta}{sub N} {approx} 2.5 with N-NB, R/S; HH{sub y2} {approx} 2.2 and {beta}{sub N} {approx} 2 with f{sub BS} {approx} 80%). High performance plasmas with a high n{sub Do}{tau}{sub E}T{sub io} and at high normalized density were also produced under fully noninductive condition in high {beta}p ELMy H-mode and R/S mode.

  18. Development of TiC coated wall materials for JT-60

    NASA Astrophysics Data System (ADS)

    Abe, T.; Murakami, Y.; Obara, K.; Hiroki, S.; Nakamura, K.; Mizoguchi, T.; Doi, A.; Inagawa, K.

    1985-08-01

    Development of titanium carbide (TiC, 20 ?m thick) coated wall materials has been carried out for JT-60. Application of TiC coatings onto molybdenum and Inconel 625 substrates requires a deposition temperature below 950°C and 600°C respectively, because recrystallization of molybdenum and age hardening of Inconel 625 occur above these temperatures. Through this process of coating we developed a new type plasma CVD(TP-CVD method) for molybdenum and a new type PVD(HCD-ARE method) for Inconel 625 which could successfully reduce the deposition temperature to 900°C and 500°C, respectively. The TiC coated wall samples were characterized by AES, ESCA, X-ray diffractometer, EPMA, SEM, metallography, tensile tests, thermal shock tests, and others techniques. As a results of the above measurements, it was demonstrated that the characteristics of those TiC coated walls satisfy the requirements arising from JT-60 operation conditions.

  19. Comparison of Lower Hybrid Current Drive Experiments in JT-60 with Theory

    Microsoft Academic Search

    R. S. Devoto; S. Ide; T. Imai; K. Ushigusa; K. Tani; M. Azumi; P. T. Bonoli

    1992-01-01

    We have extended the ACCOME code with LH current drive to model up-down asymmetric plasma equilibria. We then applied the code to two well-diagnosed experiments on JT-60 one with the multijunction (MJ) grill phased to launch waves with n||=1.45 and another with both the multijunction grill at the same n|| and a conventional launcher at n||=1.70. The simulations predict a

  20. A new LHRF multijunction launcher with oversized waveguides for JT-60U

    Microsoft Academic Search

    Y. Ikeda; M. Seki; T. Imai; K. Ushigusa; S. Takahashi; M. Sawahata; K. Suganuma; A. Takasa

    1991-01-01

    The main objective of the LHCD (lower hybrid current drive) on JT-60U (JAERI Tokamak-60 Upgrade) is to drive plasma current and to control plasma current profile with high efficiency. A new multijunction launcher is being prepared to further improve the efficiency. The launcher features 4×4 multijunction modules, each of which is composed by 12 sub-waveguides and an oversized waveguide The

  1. High energy negative-ion based neutral beam injection system for JT-60U

    Microsoft Academic Search

    M. Kuriyama; N. Akino; M. Araki; N. Ebisawa; M. Hanada; T. Inoue; M. Kawai; M. Kazawa; J. Koizumi; T. Kunieda; M. Matsuoka; K. Miyamoto; M. Mizuno; K. Mogaki; Y. Ohara; T. Ohga; Y. Okumura; H. Oohara; F. Satoh; T. Suzuki; S. Takahashi; T. Takayasu; H. Usami; K. Usui; K. Watanabe; M. Yamamoto; T. Yamazaki

    1995-01-01

    On the basis of recent progress in the research and development of a high current and high energy negative-ion source, the construction of a 500 keV negative-ion based neutral beam injection (NBI) system for JT-60U has begun to demonstrate a mega-amp level NB current drive at high plasma density and to study high energy beam heating in reactor-grade plasmas. The

  2. Achievement of High Fusion Performance in JT-60U Reversed Shear Discharges

    Microsoft Academic Search

    S. Ishida; T. Fujita; H. Akasaka; N. Akino; K. Annou; T. Aoyagi; T. Arai; K. Arakawa; N. Asakura; M. Azumi; R. Budny; S. Chiba; O. da Costa; N. Ebisawa; T. Fujii; T. Fukuda; A. Funahashi; L. Grisham; S. Gunji; K. Hamamatsu; Y. Hasegawa; T. Hatae; S. Higashijima; H. Hiratsuka; S. Hirauchi; T. Hirayama; A. Honda; M. Honda; N. Hosogane; H. Ichige; S. Ide; Y. Ikeda; M. Isaka; A. Isayama; N. Isei; Y. Ishii; N. Isozaki; K. Itami; T. Itoh; T. Iwahashi; Y. Kamada; A. Kaminaga; T. Kashiwabara; M. Kawai; Y. Kawamata; Y. Kawano; D. Kazama; M. Kazawa; M. Kikuchi; H. Kimura; T. Kimura; H. Kishimoto; Y. Kishimoto; S. Kitamura; K. Kiyono; K. Kodama; Y. Koide; S. Kokusen; T. Kondoh; S. Konoshima; J. Koog; G. J. Kramer; H. Kubo; K. Kurihara; G. Kurita; M. Kuriyama; Y. Kusama; K. Masaki; T. Matsuda; T. Matsumoto; M. Matukawa; T. Miura; N. Miya; K. Miyachi; H. Miyata; Y. Miyo; K. Mogaki; M. Mori; M. Morimoto; S. Morioka; S. Moriyama; M. Nagami; A. Nagashima; K. Nagashima; S. Nagaya; O. Naito; Y. Nakamura; M. Nemoto; Y. Neyatani; T. Nishitani; N. Ogiwara; T. Ohga; M. Ohsawa; T. Ohshima; T. Oikawa; T. Okabe; J. Okano; K. Omori; S. Omori; Y. Omori; Y. Onose; H. Oohara; T. Ozeki; M. Saidoh; M. Saigusa; N. Saito; A. Sakasai; S. Sakata; S. Sakurai; T. Sasajima; M. Sato; S. D. Scott; M. Seimiya; H. Seiki; M. Seki; M. Shimada; K. Shimizu; M. Shimizu; M. Shimono; S. Shinozaki; H. Shirai; M. Shitomi; K. Suganuma; T. Sugie; H. Sunaoshi; M. Takahashi; S. Takahashi; S. Takeji; H. Takenaga; T. Takizuka; H. Tamai; M. Terakado; T. Terakado; K. Tobita; S. Tokuda; T. Totsuka; Y. Toyokawa; N. Toyoshima; K. Tsuchiya; T. Tsugita; Y. Tsukahara; T. Tuda; Y. Uramoto; K. Ushigusa; K. Usui; J. Yagyu; M. Yamagiwa; M. Yamamoto; T. Yamamoto; O. Yamashita; K. Yokokura; H. Yoshida; M. Yoshida; R. Yoshino

    1997-01-01

    Fusion performance of reversed shear discharges with an L-mode edge has been significantly improved in a thermonuclear dominant regime with up to 2.8 MA of plasma current in the JT-60U tokamak. The core plasma energy is efficiently confined due to the existence of persistent internal transport barriers formed for both ions and electrons at a large minor radius of r\\/a~0.7

  3. The JT-60SA Toroidal Field Conductor Reference Sample: Manufacturing and Test Results

    Microsoft Academic Search

    L. Muzzi; V. Corato; G. De Marzi; A. Di Zenobio; C. Fiamozzi Zignani; L. Reccia; S. Turtu; A. della Corte; P. Barabaschi; M. Peyrot; P. Bruzzone; B. Stepanov

    2010-01-01

    In the framework of the JT-60SA design activities, EU home team has defined a reference layout for the Toroidal Field conductor: it is a slightly rectangular Cable-In-Conduit NbTi conductor, operating at 25.7 kA with a peak field of 5.65 T. ENEA has assigned LUVATA Fornaci di Barga the task to produce the strands and to perform cabling, whereas jacketing and

  4. Energy confinement scaling for reversed-shear plasmas with internal transport barrier in JT-60U

    Microsoft Academic Search

    T. Takizuka; Y. Sakamoto; T. Fukuda; T. Fujita; Y. Kamada; T. Suzuki; S. Ide; H. Shirai

    2002-01-01

    An energy confinement scaling for reversed-shear plasmas with box-type internal transport barrier (ITB) and L-mode edge is developed based on the JT-60U data. The stored energy is divided into two parts: L-mode base part and core part surrounded by the ITB. The core stored energy Wcore does not simply increase with the net heating power Pnet. A scaling of core

  5. Damage and surface modification of TiC coated Mo divertor of JT-60

    Microsoft Academic Search

    N. Yoshida; T. Katoh; K. Tokunaga; T. Moruga; T. Ando

    1995-01-01

    Damage to a TiC coated Mo divertor plate used in JT-60 for about two years was re-examined from a material viewpoint to obtain data concerning utilization of high-Z plasma facing components in future fusion reactors. Serious damage was observed on the edge of several divertor plates located next to a toroidal gap. Due to very high heat fluxes a apart

  6. High voltage power supply of negative-ion based NBI for JT-60U

    Microsoft Academic Search

    T. Ohga; K. Usui; K. Ohmori; K. Watanabe; K. Ohshima; T. Itoh; M. Kawai; M. Kuriyama

    1997-01-01

    The power supply for the negative-ion based NBI system for JT-60U is composed of negative-ion generation, extraction and acceleration power supplies. The acceleration power supply is used to accelerate negative ions up to 500 keV and has a function of power cut off within 200 ?sec for protecting the grid of the accelerator and the power supply itself by a

  7. The operational phase of negative ion beam systems on JT-60U and LHD

    Microsoft Academic Search

    Larry R. Grisham

    2005-01-01

    This paper reviews the operational phase of the negative-ion-based neutral beam systems on the JT-60U tokamak in Naka, Japan and the large helical device (LHD) stellarator in Toki, Japan. These systems were the first high power negative ion beam systems to be deployed for any application, and thus represented large advances in the state of the art for negative ion

  8. First measurement of time-resolved neutron yield on JT-60U using a microfission chamber

    NASA Astrophysics Data System (ADS)

    Hayashi, T.; Nishitani, T.; Ishikawa, M.

    2004-10-01

    Microfission chambers, which are pencil sized ionization chamber containing fissile material inside, will be installed in the vacuum vessel as neutron monitors for International Thermonuclear Experimental Reactor (ITER). We have performed first measurements of the detector installed between the vacuum vessel and toroidal coils on JT-60U. The technical validity as a neutron monitor, such as magnetic field effect and electromagnetic noises from the plasma and heating devices, has been investigated. The detector had an excellent linearity with a 235U fission chamber as a neutron monitor on JT-60U with the standard deviation of 3% except for some noise signals. The electromagnetic noises were caused by neutral beam injection (NBI) breakdowns, probably due to long wiring between the detector and the preamplifier. In case of plasma disruption, improper signals have not been observed. The magnetic field effect also has not been observed up to 2 T. In JT-60U, we confirmed availability of the micro fission chamber as a neutron monitor over three decades of neutron source strength up to 1.3×1016 neutrons/s with 1 ms temporal resolution. The biggest weakness in the detector was its noise sensitivity to NBI breakdowns. Therefore, by suppressing the electromagnetic noise, microfission chambers can be available as neutron monitors for ITER.

  9. Risk of Mortality Associated With QT and JT Intervals at Different Levels of QRS Duration (from the Third National Health and Nutrition Examination Survey).

    PubMed

    Zulqarnain, Muhammad A; Qureshi, Waqas T; O'Neal, Wesley T; Shah, Amit J; Soliman, Elsayed Z

    2015-07-01

    QT prolongation in the setting of QRS >120 ms is believed to be triggered by prolonged depolarization rather than repolarization. Hence, JT interval is suggested as an alternative to QT interval when QRS duration is prolonged. It is unclear, however, if JT and QT intervals portend similar risk of mortality for different durations of QRS. We examined the association between QT and JT, separately, with all-cause mortality across different levels of QRS duration in 8,025 participants (60 ± 13 years, 41% white and 54% women) from the Third National Health and Nutrition Examination Survey. At baseline (1986 to 1994), 486 participants (6%) had QRS duration ?120 ms. During a follow-up of up to 18 years, 3,045 deaths (38%) occurred. There were significant nonlinear relations of QT and JT intervals with mortality (p <0.001). Hence, QT and JT were categorized as prolonged (>95th percentile), shortened (<5th percentile), and normal (reference group). In multivariate-adjusted Cox regression models, prolonged JT (hazard ratio [HR] 4.75, 95% confidence interval [CI] 1.86 to 12.11) was associated with increased risk of mortality more than prolonged QT (HR 1.50, 95% CI 1.03 to 2.17) in participants with QRS ?120 ms (interaction p = 0.02). In participants with QRS duration <120 ms, prolonged QT and JT were equally predictive of all-cause mortality (HR 1.27, 95% CI 1.06 to 1.54, and HR 1.31, 95% CI 1.10 to 1.55, respectively). Similar patterns were observed with shortened QT and JT intervals. In conclusion, although both QT and JT intervals are predictive of mortality, JT is more predictive in the setting of QRS duration >120 ms supporting the use of JT interval in patients with prolonged QRS. PMID:25929581

  10. Understanding of the fundamental differences in JET and JT-60U AT discharges

    NASA Astrophysics Data System (ADS)

    Sirén, P.; Tala, T.; Corrigan, G.; Garcia, J.; Koskela, T.; Köchl, F.; Litaudon, X.; Salmi, A.; EFDA contributors, JET; the EU-ITM ITER Scenario Modelling Group

    2015-07-01

    Plasma current density simulations of JET and JT-60U shots in reverse-q advanced scenarios based on the previous data analysis of the identity plasma experiments have been performed. The effects of the main differences between the shots (neutral beam current density (jnbi), electron density and geometry) have been studied. The reversed q-profile (which was the target in this identity experiment and is observed at the beginning of each shot) was sustained in JT-60U while it became flat in JET towards the end of the shot. In JET, jnbi is peaked on-axis whereas in JT-60U it is peaked off-axis (at ? = 0.5) while the NBI fraction of the selected shots is the same (22–24%). A strong density ITB appeared (at ? = 0.5) in JT-60U but not in JET. The plasma geometry was mainly set to match but it was not identical. In addition, the extrapolation to JET steady-state operation has been done by testing the sensitivity of q to different externally driven currents, electron density and geometry in predictive current diffusion simulations. Moreover, critical bootstrap current density has been analysed. The reasons for the different time evolution of q-profile have been studied with predictive current simulations with the 1.5D transport code JETTO. The current diffusion model was validated against reverse-q shots, and simulations were performed with experimental data profiles, jNBI given by ASCOT and neoclassical resistivity and bootstrap current calculated by NCLASS. Bootstrap current density was the most efficient way to sustain the beneficial reverse shape of q-profile. Replacing the JET ne profile with one from JT-60U leads to an increase of 0.2–0.3?MA in the bootstrap current (f?bs increases from 15% to 30%). However, sustaining the stationary reverse q is not achieved in JET with bootstrap current induced by the density gradient of JT-60U. Even 10 times larger gradient than in JT-60U helps to sustain the shape of the q-profile longer than the experimentally observed density profile in JET but the minimum value of q moves closer to central plasma and the shape of q is not stationary in a 10?s simulation. The effect of different shape of NBI current density profile is negligible due to quite small fraction. Sustaining the reverse q requires 45% or larger added off-axis fraction. However, increasing the inverse aspect ratio increases bootstrap current and decreases the critical bootstrap current more effectively than increasing the density gradient: two times larger inverse aspect ratio produces almost three times larger bootstrap fraction but ten times larger density gradient only two times larger bootstrap fraction. The conclusions based on these simulations indicate that the need for bootstrap current is larger in JET and the same conditions cause smaller bootstrap fraction, which suggests that achieving steady-state operation in JET under these conditions is unlikely.

  11. Progress in long-pulse production of powerful negative ion beams for JT-60SA and ITER

    NASA Astrophysics Data System (ADS)

    Kojima, A.; Umeda, N.; Hanada, M.; Yoshida, M.; Kashiwagi, M.; Tobari, H.; Watanabe, K.; Akino, N.; Komata, M.; Mogaki, K.; Sasaki, S.; Seki, N.; Nemoto, S.; Shimizu, T.; Endo, Y.; Ohasa, K.; Dairaku, M.; Yamanaka, H.; Grisham, L. R.

    2015-06-01

    Significant progress in the extension of pulse durations of powerful negative ion beams has been made to realize the neutral beam injectors for JT-60SA and ITER. In order to overcome common issues of the long-pulse production/acceleration of negative ion beams in JT-60SA and ITER, new technologies have been developed in the JT-60SA ion source and the MeV accelerator in Japan Atomic Energy Agency. As for the long-pulse production of high-current negative ions for the JT-60SA ion source, the pulse durations have been successfully increased from 30 s at 13 A on JT-60U to 100 s at 15 A by modifying the JT-60SA ion source, which satisfies the required pulse duration of 100 s and 70% of the rated beam current for JT-60SA. This progress was based on the R&D efforts for the temperature control of the plasma grid and uniform negative ion productions with the modified tent-shaped filter field configuration. Moreover, each parameter of the required beam energy, current and pulse has been achieved individually by these R&D efforts. The developed techniques are useful to design the ITER ion source because the sustainment of the caesium coverage in the large extraction area is one of the common issues between JT-60SA and ITER. As for the long-pulse acceleration of high power density beams in the MeV accelerator for ITER, the pulse duration of MeV-class negative ion beams has been extended by more than 2 orders of magnitude by modifying the extraction grid with a high cooling capability and a high transmission of negative ions. A long-pulse acceleration of 60 s has been achieved at 70 MW m?2 (683 keV, 100 A m?2) which has reached the power density of JT-60SA level of 65 MW m?2. No degradations of the voltage holding capability of the acceleration voltage and the beam optics due to the distortion of the acceleration grids have been observed in this power density level. These results are the longest pulse durations of high-current and high-power-density negative ion beams in the world.

  12. Phase 2 program on ground test of refanned JT8D turbofan engines and nacelles for the 727 airplane. Volume 3: Ground tests

    NASA Technical Reports Server (NTRS)

    1975-01-01

    The NASA Refan Program included full-scale performance and noise ground tests of both a current production (JT8D-15) and a refanned (JT8D-115) engine. A description of the two ground tests including detailed propulsion, noise, and structural test results is presented. The primary objectives of the total test program were comparison of JT8D-15 and JT8D-115 overall propulsion system performance and noise characteristics and determination of incremental component noise levels. Other objectives of the test program included: (1) determination of acoustic treatment effectiveness; (2) measurement of internal sound pressure levels; (3) measurement of inlet and exhaust hardware performance; (4) determination of center-engine surge margin; and (5) evaluation of certain structural characteristics associated with the 727 refan center-engine inlet duct and JT8D refan engine exhaust system. The JT8D-15 and -115 tests were conducted during September 1974 and January to March 1975, respectively. Analyses of the test data indicated that the JT8D-115, as compared to the JT8D-15, demonstrates a 12.5 percent to 13.2 percent reduction in static specific fuel consumption, and a reduction of 6 to 7 PNdB in a weighted average value of static tone corrected perceived noise level. Separated into noise components, a significant reduction was shown for the inlet fan, aft fan, exhaust duct flow, turbine, and jet noises. However, core noise was increased. Photographs of test stands and test equipment are shown.

  13. Research and Development of 2-frequency (110/138 GHz) FADIS for JT-60SA ECHCD system

    NASA Astrophysics Data System (ADS)

    Idei, H.; Moriyama, S.; Kobayashi, T.; Isayama, A.; Sakaguchi, M.; Kasparek, W.

    2015-03-01

    A FAst DIrectional Switch (FADIS) of 2-frequency (2-ƒ) gyrotron system for the JT-60SA project is being developed under collaboration between Japan Atomic Energy Agency (JAEA) and Kyushu University. At first, the frequency drift and dip in the gyrotron operation were measured to consider which kind of FADIS is preferred for application in the Electron Cyclotron Heating and Current Drive (ECHCD) system for the JT- 60SA. Various types of the FADIS have been considered. A square corrugated waveguide diplexer system with double resonant rings was considered as one of the most attractive FADIS systems for stable high-power and long-pulse operations in the 2-ƒ JT-60SA ECHCD system.

  14. Progress of high-power and long-pulse ECRF system development in JT-60

    NASA Astrophysics Data System (ADS)

    Kobayashi, T.; Isayama, A.; Yokokura, K.; Shimono, M.; Hasegawa, K.; Sawahata, M.; Suzuki, S.; Terakado, M.; Hiranai, S.; Sato, F.; Wada, K.; Hinata, J.; Sato, Y.; Ohzeki, M.; Takahashi, K.; Kajiwara, K.; Oda, Y.; Kasugai, A.; Sakamoto, K.; Hoshino, K.; Moriyama, S.

    2011-10-01

    A new gyrotron operation technique to increase oscillation efficiency was developed using the JT-60 electron cyclotron range of frequency (ECRF) system. In order to increase the efficiency without a significant increase in the anode leakage current by trapped electrons that limits the efficiency of gyrotrons with a collector potential depression technology, we actively optimized the electron pitch factor by controlling only the anode voltage within ~0.1 s after the start of the gyrotron operation, and a high-efficiency oscillation in the so-called hard-self-excitation region was achieved from the start of the oscillation. As an application of this technique in the JT-60 ECRF system, the gyrotron output power of 1.5 MW for 4 s, which is the longest pulse length in the world at an output power of 1.5 MW, was recorded with a successful reduction in the collector heat load by 20% as compared with the conventional operation. The reduced collector heat load at the 1.5 MW operation was acceptable for a steady-state operation. Further progress was made with respect to the expansion of the long-pulse capability of the ECRF system. A new gyrotron with an improved mode converter was developed in order to demonstrate a reduction in the stray radiation in the gyrotron; such radiation has thus far hindered long-pulse operations by causing an unacceptable heat load. We confirmed that the stray radiation was reduced to 1/3 of that of the original gyrotron; this reduced heat load is acceptable for steady-state operation. A conditioning operation of the improved gyrotron proceeds up to 31 s at 1 MW. This progress significantly contributes to an enhancement in the high-power and long-pulse capability of the ECRF system used in JT-60SA, where a total output power of 9 MW for 100 s is planned.

  15. JT9D engine diagnostics. Task 2: Feasibility study of measuring in-service flight loads. [747 aircraft performance

    NASA Technical Reports Server (NTRS)

    Kafka, P. G.; Skibo, M. A.; White, J. L.

    1977-01-01

    The feasibility of measuring JT9D propulsion system flight inertia loads on a 747 airplane is studied. Flight loads background is discussed including the current status of 747/JT9D loads knowledge. An instrumentation and test plan is formulated for an airline-owned in-service airplane and the Boeing-owned RA001 test airplane. Technical and cost comparisons are made between these two options. An overall technical feasibility evaluation is made and a cost summary presented. Conclusions and recommendations are presented in regard to using existing inertia loads data versus conducting a flight test to measure inertia loads.

  16. Non-inductive current drive and profile control in JT-60U

    Microsoft Academic Search

    K. Ushigusa

    1995-01-01

    Recent studies in JT-60U to establish physics base of a steady-state tokamak reactor are presented. High fusion performance with fusion triple product nD(0)?ETi(0)=1.2×1021 keVsm?3 (equivalent QDT=0.6) has been achieved transiently in the high ?pH-mode regime. By optimizing the current and pressure profiles, a quasi steady-state high ?pH-mode with nD(0)?ETi(0)=(0.4?0.5)×1021 keVsm?3 (equivalent QDT=0.25?0.36) was maintained for up to 1.5 s. In

  17. JT8D-15/17 High Pressure Turbine Root Discharged Blade Performance Improvement. [engine design

    NASA Technical Reports Server (NTRS)

    Janus, A. S.

    1981-01-01

    The JT8D high pressure turbine blade and seal were modified, using a more efficient blade cooling system, improved airfoil aerodynamics, more effective control of secondary flows, and improved blade tip sealing. Engine testing was conducted to determine the effect of these improvements on performance. The modified turbine package demonstrated significant thrust specific fuel consumption and exhaust gas temperature improvements in sea level and altitude engine tests. Inspection of the improved blade and seal hardware after testing revealed no unusual wear or degradation.

  18. Edge safety factor at the onset of plasma disruption during VDEs in JT-60U

    NASA Astrophysics Data System (ADS)

    Sugihara, Masayoshi; Lukash, Victor; Khayrutdinov, Rustam; Neyatani, Yuzuru

    2004-10-01

    Detailed examinations of the value of the edge safety factor (qa) at the onset of thermal quench (TQ) during intentional vertical displacement event (VDE) experiments in JT-60U are carried out using two different reconstruction methods, FBI/FBEQU and DINA. The results from the two methods are very similar and show that the TQ occurs when the qa value is in the range between 1.5 and 2. This result suggests that the predictive simulations for VDEs should be performed within this range of q to examine the subsequent differences in the halo currents, plasma movement and other plasma behaviour during the current quench.

  19. Analyses of core heat transport in plasmas with different toroidal rotation profiles in JT-60U

    NASA Astrophysics Data System (ADS)

    Narita, Emi; Honda, Mitsuru; Hayashi, Nobuhiko; Urano, Hajime; Ide, Shunsuke; Fukuda, Takeshi

    2013-10-01

    It has been reported that in H-mode plasmas, toroidal rotation in the co direction with respect to the plasma current is more favorable for energy confinement than that in the counter direction. Effects of toroidal rotation on core temperature profiles have been pointed out, whereas the improved confinement has been found to be due to an increase in the pedestal temperature with co-toroidal rotation and profile resilience. In JT-60U, roles of toroidal rotation have been studied using neutral beam injection changes. In this study, core heat transport of these plasmas with different toroidal rotation profiles is investigated with several transport models implemented in the transport code TOPICS. These transport models give the anomalous heat diffusivity and are tested against conventional H-mode plasmas in JT-60U. The calculations are performed with the E × B shear effect. The relationship between heat transport and toroidal rotation is examined with a flux-tube gyrokinetic code, which we will present in the paper. It has been reported that in H-mode plasmas, toroidal rotation in the co direction with respect to the plasma current is more favorable for energy confinement than that in the counter direction. Effects of toroidal rotation on core temperature profiles have been pointed out, whereas the improved confinement has been found to be due to an increase in the pedestal temperature with co-toroidal rotation and profile resilience. In JT-60U, roles of toroidal rotation have been studied using neutral beam injection changes. In this study, core heat transport of these plasmas with different toroidal rotation profiles is investigated with several transport models implemented in the transport code TOPICS. These transport models give the anomalous heat diffusivity and are tested against conventional H-mode plasmas in JT-60U. The calculations are performed with the E × B shear effect. The relationship between heat transport and toroidal rotation is examined with a flux-tube gyrokinetic code, which we will present in the paper. Work supported by JSPS Research Fellowships for Young Scientists.

  20. JT90 Ceramic Outer Air Seal System Refinement Program, Phase 2

    NASA Technical Reports Server (NTRS)

    Shiembob, L. T.

    1982-01-01

    The sprayed ceramic gas turbine outer air seal system was tested in two JT9D engines to substantiate the abradability and durability of the seals. Of particular significance was that one of the tests, a 150 hour 1000 cycle endurance program at nominal JT9D operating conditions, was completed with minimal effect on the seals and received Federal Aviation Administration cognizance with respect to potential field service use by the airlines. The other engine test completed 1825 endurance cycles at severe operating conditions and no burn through or other serious defects in the structural integrity of a seal segment was observed. These test results combined with other Pratt and Whitney Aircraft engine tests substantiate the potential of the ceramic outer air seal system to attain the durability goal of 50000 hour engine operating capability. Both engine tests subjected the seals to intentional blade rubs and demonstrated good abradability with volume wear ratios greater than 100, far exceeding the design goal of 10. The improved volume wear ratio will allow the turbine tip clearance to be reduced, thereby resulting in an estimated thrust specific fuel consumption improvement of 0.3 percent.

  1. Progress in integrated modeling of JT-60SA plasma operation scenarios with model validation and verification

    NASA Astrophysics Data System (ADS)

    Hayashi, Nobuhiko; Garcia, Jeronimo; Honda, Mitsuru; Shimizu, Katsuhiro; Hoshino, Kazuo; Ide, Shunsuke; Giruzzi, Gerardo; Sakamoto, Yoshiteru; Suzuki, Takahiro; Urano, Hajime; JT-60 Team; JET EFDA Collaboration

    2014-10-01

    Development of plasma operation scenarios in JT-60SA has been progressing by using integrated modeling codes. In order to obtain an optimum set of models for the prediction, models are validated by using JT-60U and JET experimental data, and verified by integrated codes such as TOPICS and CRONOS. Predictive simulations are performed to assess the performance of each scenario and to develop optimum scenarios. In the scenario development, various physics aspects are studied by using various types of integrated modeling. The integrated divertor code SONIC showed that Ar seeding can reduce the heat flux on divertor plates below the preferable level (10 MW/m2) with keeping low separatrix density in the full non-inductive current drive scenario, however, there are some amounts of Ar influx to core region. We integrate TOPICS with a core impurity transport code IMPACT and study the Ar accumulation in the core and its effect on the performance. Other studies with integrated modeling will be also presented.

  2. DC-9 Flight Demonstration Program with Refanned JT8D Engines. Volume 3; Performance and Analysis

    NASA Technical Reports Server (NTRS)

    1975-01-01

    The JT8D-109 engine has a sea level static, standard day bare engine takeoff thrust of 73,840 N. At sea level standard day conditions the additional thrust of the JT8D-109 results in 2,040 kg additional takeoff gross weight capability for a given field length. Range loss of the DC-9 Refan airplane for long range cruise was determined. The Refan airplane demonstrated stall, static longitudinal stability, longitudinal control, longitudinal trim, minimum control speeds, and directional control characteristics similar to the DC-9-30 production airplane and complied with airworthiness requirements. Cruise, climb, and thrust reverser performance were evaluated. Structural and dynamic ground test, flight test and analytical results substantiate Refan Program requirements that the nacelle, thrust reverser hardware, and the airplane structural modifications are flightworthy and certifiable and that the airplane meets flutter speed margins. Estimated unit cost of a DC-9 Refan retrofit program is 1.338 million in mid-1975 dollars with about an equal split in cost between airframe and engine.

  3. Tritium Profiles on the Surface of Graphite Tiles used in JT-60U

    NASA Astrophysics Data System (ADS)

    Sugiyama, K.; Miyasaka, K.; Tanabe, T.; Masaki, K.; Gotoh, Y.; Tobita, K.; Kodama, K.; Miya, N.

    Tritium Imaging Plate Technique (TIPT) is used to measure the tritium areal distribution on plasma facing graphite tiles of JT-60U. Measurement of the W-shaped divertor region showed that the surface tritium distribution of tiles used under the “both-side pumping” system was similar to that of tiles used under the “inner-side pumping” system. This result suggests that tritium retained in those tiles is not affected by the type of exhaust system because this tritium was implanted with high energy. Thus, tritons produced by D-D reaction were implanted in the plasma facing wall without completely losing their initial energy. The tritium level beneath the redeposited layer on the inner divertor target tile was about three times as high as that of the surface of the redeposited layer. The toroidal surface tritium distribution suggested ripple loss of high energy tritons. These results also indicate that long-term tritium retention in JT-60U was caused by implantation of high-energy tritons.

  4. DC-9 flight demonstration program with refanned JT8D engines. Volume 4: Flyover noise

    NASA Technical Reports Server (NTRS)

    1975-01-01

    Flyover noise tests were conducted to determine the noise reductions achievable by modifying the engines and nacelles of DC-9-30 airplanes. The two stage fan of the JT8D-9 engine was replaced with a larger diameter, single stage fan and sound absorbing materials were incorporated in the engines and nacelles. The noise levels were determined to be 95.3 EPNdB at the sideline, 96.2 EPNdB for a full thrust takeoff, 87.5 EPNdB for takeoff with thrust cutback, and 97.4 EPNdB for landing approach. The noise reductions relative to the hardwall JT8D-9 were 8.2 EPNdB for takeoff with cutback and 8.7 EPNdB for landing. The 90 EPNdB noise contour areas were reduced by 40% for missions requiring maximum design takeoff and landing weights. For typical mission weights, the reductions were 19% for full thrust takeoff and 34% for takeoff with cutback. The 95 EPNdB contour areas were reduced by 50% for takeoff and 30% for takeoff with cutback for both missions.

  5. Improved Confinement in Impurity-Seeded Plasmas in JT-60U and TFTR

    NASA Astrophysics Data System (ADS)

    Hill, K. W.; Ernst, D. R.; Park, H. K.; Rewoldt, G.; Synakowski, E. J.; Taylor, G.; Bush, C. E.; Asakura, N.; Kubo, H.; Sakurai, S.; Itami, K.; Tamai, H.; Konoshima, S.; Higashijima, S.; Shimizu, K.; Shirai, H.; JT-60u Team

    2000-10-01

    Improved energy confinement in impurity-seeded plasmas has been observed on several tokamaks, offering the possibility of high confinement at high density and reduced power to the wall. We analyze and compare impurity-seeded plasmas in TFTR and JT-60U, with a goal of understanding the improved confinement. In JT-60U ELMy H-modes with Ar puffing at n_e^GW = 0.7, H = 1.4 has been achieved, about 40% higher than with D2 puffing alone. In TFTR supershots at NBI power Pb ~ 16 MW, \\chii and \\chi_? decreased with Kr and Xe puffing; the ITG mode was stabilized by Kr puffing. At high power (Pb > 28 MW) with Kr injection, confinement and fusion power were improved, and carbon blooms were eliminated. Analysis includes thermal transport by the TRANSP and TOPICS codes, microinstability predictions by FULL and GS2, E× B shearing rate by TRV, and impurity transport and radiated power distributions by MIST and IMPACT.

  6. Compact antenna for two-dimensional beam scan in the JT-60U electron cyclotron heating\\/current drive system

    Microsoft Academic Search

    S. Moriyama; K. Kajiwara; K. Takahashi; A. Kasugai; M. Seki; Y. Ikeda; T. Fujii

    2005-01-01

    A compact antenna system was designed and fabricated to enable millimeter-wave beam scanning in the toroidal and poloidal directions of the JT-60U tokamak for electron cyclotron heating (ECH) and electron cyclotron current drive (ECCD) experiments. The antenna consists of a fast movable flat mirror mounted on the tokamak vacuum vessel and a rotary focusing mirror attached at the end of

  7. M. Takechi, M. Ishikawa, K. Shinohara,Y. Kusama, JT-6th ITPA MHD Topical Group Meeting

    E-print Network

    transport - neutron emission profile - detailed energy distribution of neutral particle fluxes - in Weak transport #12;JT-60U Neutron Profile Monitor Objectives : -Measure radial profile of neutron emission rate investigate energetic ion transport from change in neutron emission profile and enhanced neutral particle

  8. A study on fuzzy intrusion detection J.T. Yao S.L. Zhao L. V. Saxton

    E-print Network

    Yao, JingTao

    A study on fuzzy intrusion detection J.T. Yao S.L. Zhao L. V. Saxton Department of Computer Science,saxton]@cs.uregina.ca ABSTRACT Current intrusion detection techniques mainly focus on discovering abnormal system events to determine a possible attack. Due to the uncertainty nature of intrusions, fuzzy sets play an important role

  9. Ion temperature profile simulation of JT-60 and TFTR plasmas with ion temperature gradient mode transport models

    Microsoft Academic Search

    H. Shirai; T. Hirayama; Y. Koide; H. Yoshida; O. Naito; M. Sato; T. Fukuda; T. Sugie; M. Azumi; D. R. Mikkelsen; S. D. Scott; B. Grek; K. W. Hill; D. W. Johnson; D. K. Mansfield; H. K. Park; B. C. Stratton; E. J. Synakowski; G. Taylor; H. H. Towner

    1994-01-01

    Ion temperature profiles of neutral beam heated plasmas in JT-60 and TFTR have been simulated using models of ion thermal diffusivity, chii, based on ion temperature gradient mode (etai mode) turbulence and drift wave turbulence (trapped electron mode and circulating electron mode). The ion temperature profiles measured by charge exchange recombination spectroscopy are compared to predicted Ti profiles calculated from

  10. An online FT-ICR Penning-trap mass spectrometer for the DPS2-F section of the KATRIN experiment

    NASA Astrophysics Data System (ADS)

    Heck, M.; Ascher, P.; Cakirli, R. B.; Golzke, H.; Rodríguez, D.; Stahl, S.; Ubieto-Díaz, M.; Blaum, K.

    2014-09-01

    Two Fourier-transform ion-cyclotron resonance (FT-ICR) Penning-trap mass spectrometers will be installed in the pumping section of the KArlsruhe TRItium Neutrino (KATRIN) experiment. This experiment aims at determining the electron anti-neutrino mass m(?ebar) with a sensitivity of 0.2 eV (90% C.L.) by high-resolution tritium ?-spectroscopy. The tritium source creates various types of ions, which have to be reduced in order to reach the required low background level. The purpose of the FT-ICR mass spectrometers is the identification of the ion flux components as well as their abundance. Furthermore, the pumping efficiency of the differential pumping section DPS2-F can be determined since these Penning traps will be installed one at the entrance and one at the exit. In this paper the operation of the FT-ICR system is described. Experimental results are presented concerning the cryogenic broad-band amplifier system for the FT-ICR detection as well as the characterisation of the mass spectrometer with respect to, e.g., noise density and detection limit.

  11. Achievement of High Fusion Performance in JT-60U Reversed Shear Discharges

    SciTech Connect

    Ishida, S.; Fujita, T.; Akasaka, H.; Akino, N.; Annou, K.; Aoyagi, T.; Arai, T.; Arakawa, K.; Asakura, N.; Azumi, M.; Budny, R.; Chiba, S.; Da Costa, O.; Ebisawa, N.; Fujii, T.; Fukuda, T.; Funahashi, A.; Grisham, L.; Gunji, S.; Hamamatsu, K.; Hasegawa, Y.; Hatae, T.; Higashijima, S.; Hiratsuka, H.; Hirauchi, S.; Hirayama, T.; Honda, A.; Honda, M.; Hosogane, N.; Ichige, H.; Ide, S.; Ikeda, Y.; Isaka, M.; Isayama, A.; Isei, N.; Ishii, Y.; Isozaki, N.; Itami, K.; Itoh, T.; Iwahashi, T.; Kamada, Y.; Kaminaga, A.; Kashiwabara, T.; Kawai, M.; Kawamata, Y.; Kawano, Y.; Kazama, D.; Kazawa, M.; Kikuchi, M.; Kimura, H.; Kimura, T.; Kishimoto, H.; Kishimoto, Y.; Kitamura, S.; Kiyono, K.; Kodama, K.; Koide, Y.; Kokusen, S.; Kondoh, T.; Konoshima, S.; Koog, J.; Kramer, G.J.; Kubo, H.; Kurihara, K.; Kurita, G.; Kuriyama, M.; Kusama, Y.; Masaki, K.; Matsuda, T.; Matsumoto, T.; Matukawa, M.; Miura, T.; Miya, N.; Miyachi, K.; Miyata, H.; Miyo, Y.; Mogaki, K.; Mori, M.; Morimoto, M.; Morioka, S.; Moriyama, S.; Nagami, M.; Nagashima, A.; Nagashima, K.; Nagaya, S.; Naito, O.; Nakamura, Y.; Nemoto, M.; Neyatani, Y.; Nishitani, T.; Ogiwara, N.; Ohga, T.; Ohsawa, M.; Ohshima, T.; Oikawa, T.; Okabe, T.; Okano, J.; Omori, K.; Omori, S.; Omori, Y.; Onose, Y.; Oohara, H.; Ozeki, T.; Saidoh, M.; Saigusa, M.; Saito, N.; Sakasai, A.; Sakata, S.; Sakurai, S.; Sasajima, T.; Sato, M.; Scott, S.D.; Seimiya, M.; Seiki, H.; Seki, M.; Shimada, M.; Shimizu, K.; Shimizu, M.; Shimono, M.; Shinozaki, S.; Shirai, H.; Shitomi, M.; Suganuma, K.; Sugie, T.; Sunaoshi, H.; Takahashi, M.; Takahashi, S.; Takeji, S.; Takenaga, H.; Takizuka, T.; Tamai, H.; Terakado, M.; Terakado, T.; Tobita, K.; Tokuda, S.; Totsuka, T.; Toyokawa, Y.; Toyoshima, N.; Tsuchiya, K.; Tsugita, T.; Tsukahara, Y.; Tuda, T.; Uramoto, Y.; Ushigusa, K.; Usui, K.; Yagyu, J.; Yamagiwa, M.; Yamamoto, M.; Yamamoto, T.; Yamashita, O.; Yokokura, K.; Yoshida, H.; Yoshida, M.; Yoshino, R. [Japan Atomic Energy Research Institute, Naka Fus (Japan)] [Japan Atomic Energy Research Institute, Naka Fus (Japan)

    1997-11-01

    Fusion performance of reversed shear discharges with an {ital L}-mode edge has been significantly improved in a thermonuclear dominant regime with up to 2.8 MA of plasma current in the JT-60U tokamak. The core plasma energy is efficiently confined due to the existence of persistent internal transport barriers formed for both ions and electrons at a large minor radius of r/a{approximately}0.7 near the boundary of the reversed shear region. In an assumed deuterium-tritium fuel, the peak fusion amplification factor defined for transient conditions involving the dW/dt term would be in excess of unity. {copyright} {ital 1997} {ital The American Physical Society}

  12. JT8D revised high-pressure turbine cooling and other outer air seal program

    NASA Technical Reports Server (NTRS)

    Gaffin, W. O.

    1979-01-01

    The JT8D high pressure turbine was revised to reduce leakage between the blade tip shrouds and the outer air seal, and engine testing was performed to determine the effect on performance. The addition of a second knife-edge on the blade tip shroud, the extension of the honeycomb seal land to cover the added knife-edge and an existing spoiler on the shroud, and a material substitution in the seal support ring to improve thermal growth characteristics are included. A relocation of the blade cooling air discharge to insure adequate cooling flow is required. Significant specific fuel consumption and exhaust gas temperature improvements were demonstrated with the revised turbine in sea level and simulated altitude engine tests. Inspection of the revised seal hardware after these tests showed no unusual wear or degradation.

  13. Tritium release from bulk of carbon-based tiles used in JT-60U

    NASA Astrophysics Data System (ADS)

    Takeishi, Toshiharu; Katayama, Kazunari; Nishikawa, Masabumi; Masaki, Kei; Miya, Naoyuki

    2006-03-01

    Tritium thermal release behavior from the isotropic graphite tile and the CFC tile used as the plasma facing material of JT-60U was experimentally examined. Whole tritium retained in the bulk of tile could not be released by dry gas purge at high temperature in such a period as one day. Utilization of the isotope exchange reaction using purge gas with hydrogen or humid gas was more effective to release the retained tritium. However, approximately 1% of retained tritium was not recovered by the isotope exchange reaction with dry hydrogen even though such high temperature as 1200 °C was applied. Combustion method with oxygen was required to recover all tritium left in the deeper site of the tile. It was observed that combustion of isotropic graphite tile and CFC tile became vigorous at higher temperature than 700 °C though the combustion rate was rather slow at 650 °C.

  14. Hydrogen isotopes retention in the outboard first wall tiles of JT-60U

    NASA Astrophysics Data System (ADS)

    Yoshida, M.; Tanabe, T.; Nobuta, Y.; Hayashi, T.; Masaki, K.; Sato, M.

    2009-06-01

    We have investigated hydrogen isotopes retention in graphite tiles used as outboard first wall armors of JT-60U by means of SEM, TDS and SIMS. The SEM examination confirmed that these tiles are mostly eroded. Different from graphite divertor tiles, in which H retention was dominant owing to isotopic replacement during HH discharges preformed after DD discharges to remove tritium, deuterium is dominated in hydrogen isotopes retention of the outboard first wall tiles showing deeper penetration. This is attributed to the injection of high energy D and less isotopic replacement due to the lower temperature of the outboard first wall tiles. This type of hydrogen retention could not be avoided for the metallic wall. Although the amount of hydrogen isotopes retained per unit area in the outboard first wall tiles was much less than that for the divertor tiles, the integrated retention over the whole first wall surface could be very large.

  15. Fast neutron-gamma discrimination on neutron emission profile measurement on JT-60U

    SciTech Connect

    Ishii, K.; Okamoto, A.; Kitajima, S.; Sasao, M. [Department of Quantum Science and Energy Engineering, Tohoku University, Sendai 980-8579 (Japan); Shinohara, K.; Ishikawa, M. [Japan Atomic Energy Agency, 801-1 Mukoyama, Naka 311-0193 (Japan); Baba, M. [Cyclotron and Radioisotope Center, Tohoku University, Sendai 980-8578 (Japan); Isobe, M. [National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292 (Japan)

    2010-10-15

    A digital signal processing (DSP) system is applied to stilbene scintillation detectors of the multichannel neutron emission profile monitor in JT-60U. Automatic analysis of the neutron-{gamma} pulse shape discrimination is a key issue to diminish the processing time in the DSP system, and it has been applied using the two-dimensional (2D) map. Linear discriminant function is used to determine the dividing line between neutron events and {gamma}-ray events on a 2D map. In order to verify the validity of the dividing line determination, the pulse shape discrimination quality is evaluated. As a result, the {gamma}-ray contamination in most of the beam heating phase was negligible compared with the statistical error with 10 ms time resolution.

  16. The effect of wall materials on hydrogen recycling in JT-60

    NASA Astrophysics Data System (ADS)

    Sone, K.; Murakami, Y.

    1984-05-01

    A model calculation on hydrogen recycling at the wall in JT-60 has been made for three different wall materials (molybdenum, Inconel 625 and titanium carbide) for the case when the plasma is heated by neutral beam injection. It has been assumed that only charge exchange neutrals hit the wall. Values of the recycling coefficient required to keep constant plasma densities for two different flux densities 1 × 10 16 and 3 × 10 16 H/cm 2·s onto the wall have been estimated to be 0.75 and 0.92, respectively. By assuming Maxwellian energy distributions (200 and 400 eV), the recycling coefficients have been calculated as a function of time and wall temperature by taking account of particle re-emission due to backscattering, diffusion and saturation overflow. The wall temperature regions which satisfy the above criteria for 5 and 10 s discharges have been discussed for the three materials.

  17. Simulation of plasma current ramp-up with reduced magnetic flux consumption in JT-60SA

    NASA Astrophysics Data System (ADS)

    Wakatsuki, T.; Suzuki, T.; Hayashi, N.; Shiraishi, J.; Ide, S.; Takase, Y.

    2015-06-01

    Current ramp-up with reduced central solenoid (CS) flux consumption in JT-60SA has been investigated using an integrated modeling code suite (TOPICS) with a turbulent model (CDBM). The plasma current can be ramped-up from 0.6 MA to 2.1 MA with no additional CS flux consumption if the plasma current is overdriven by neutral-beam-driven and bootstrap current. A time duration required for the current ramp-up without CS flux consumption becomes as long as 150 s in the scenario we have examined. In order to achieve a current overdrive condition from 0.6 MA, the current drive by a lower energy neutral beam (85 keV) is effective. A higher energy neutral beam (500 keV) cannot be used in this early phase with a low central electron density (~2 × 1019 m?3) due to large shine through loss, while it can be effectively used in the later phase. Therefore, the main current driver should be switched from the lower energy neutral beam to the higher energy neutral beam during the current ramp-up phase. As a result of an intensive auxiliary heating, plasma beta (the ratio of the plasma pressure to the magnetic pressure) becomes high. Ideal MHD instabilities of such high beta plasmas have been investigated using a linear ideal MHD stability analysis code (MARG2D). External kink modes which might affect the core plasma can be stabilized during the current ramp-up if there is a perfectly conducting wall at the location of the stabilizing plate and the vacuum vessel of JT-60SA and the plasma has a broader pressure profile with the H-mode pedestal and the internal transport barrier.

  18. Improvement of voltage holding capability in the 500 keV negative ion source for JT-60SAa)

    NASA Astrophysics Data System (ADS)

    Tanaka, Y.; Hanada, M.; Kojima, A.; Akino, N.; Shimizu, T.; Ohshima, K.; Inoue, T.; Watanabe, K.; Taniguchi, M.; Kashiwagi, M.; Umeda, N.; Tobari, H.; Grisham, L. R.; JT-60 Nbi Group

    2010-02-01

    Voltage holding capability of JT-60 negative ion source that has a large electrostatic negative ion accelerator with 45 cm×1.1 m acceleration grids was experimentally examined and improved to realize 500 keV, 22 A, and 100 s D- ion beams for JT-60 Super Advanced. The gap lengths in the acceleration stages were extended to reduce electric fields in a gap between the large grids and at the corner of the support flanges from the original 4-5 to 3-4 kV/mm. As a result, the voltage holding capability without beam acceleration has been successfully improved from 400 to 500 kV. The pulse duration to hold 500 kV reached 40 s of the power supply limitation.

  19. A 727 airplane center duct inlet low speed performance confirmation model test for refanned JT8D engines, phase 2

    NASA Technical Reports Server (NTRS)

    Kaldschmidt, G.; Syltebo, B. E.; Ting, C. T.

    1973-01-01

    The results from testing of a 0.3 scale model center duct inlet (S duct) for the Pratt and Whitney Aircraft JT8D-100 engines are presented. The objective of this test was to demonstrate that the required airflow of the JT8D-100 engine (480 lb/sec as compared to 334 lb/sec for JT8D-15) can be achieved with minimum modifications to the existing 727 airplane structure at acceptable levels of total pressure recovery and distortion. Steady-state pressure recovery, steady-state pressure distortion, and dynamic pressure measurements were taken at the engine face station. Surface static pressure measurements were taken along the duct. Test results indicated that the required airflow was achieved with acceptable pressure recovery (comparable to the current 727-200 S duct). Inlet inflow angle variation within the 727 airplane operating regime (minus 5 to 5 degrees) had no effect on the inlet performance. Pressure distortion at static and forward speed at takeoff airflow conditions are within P and WA limits for the Phase II duct when equipped with vortex generators. Static crosswind operation between 10 knots and 25 knots appears feasible at full takeoff power.

  20. Development of Fast Measurement System of Neutron Emission Profile Using a Digital Signal Processing Technique in JT-60U

    SciTech Connect

    Ishikawa, M.; Shinohara, K. [Japan Atomic Energy Agency, Mukoyama 801-1 Naka, Ibaraki 311-0193 (Japan); Itoga, T.; Okuji, T.; Nakhostin, M.; Baba, M.; Nishitani, T. [Cyclotron and Radioisotope Center, Tohoku University, Aoba, Sendai, Miyagi 980-8578 (Japan)

    2008-03-12

    Neutron emission profiles are routinely measured in JT-60U Tokamak. Stinbene neuron detectors (SNDs), which combine a Stilbene organic crystal scintillation detector (Stilbene detector) with an analog neutron-gamma pulse shape discrimination (PSD) circuit, have been used to measure neutron flux efficiently. Although the SND has many advantages as a neutron detector, the maximum count rate is limited up to {approx}1x 10{sup 5} counts/s due to the dead time of the analog PSD circuit. To overcome this issue, a digital signal processing (DSP) system using a Flash-ADC has been developed. In this system, anode signals from the photomultiplier of the Stilbene detector are fed to the Flash ADC and digitized. Then, the PSD between neutrons and gamma-rays are performed using software. The photomultiplier tube is also modified to suppress and correct gain fluctuation of the photomultiplier. The DSP system has been installed in the center channel of the vertical neutron collimator system in JT-60U and applied to measurements of neutron flux in JT-60U experiments. Neutron flux are successfully measured with count rate up to {approx}1x 10{sup 6} counts/s without the effect of pile up of detected pulses. The performance of the DSP system as a neutron detector is demonstrated.

  1. Non-inductive current drive and profile control in JT-60U

    SciTech Connect

    Ushigusa, K. [Japan Atomic Energy Research Institute, Naka Fusion Research Establishment, Mukoyama 801-1, Naka-machi, Naka-gun, Ibaraki-ken (Japan); and the JT-60 TEAM

    1995-09-01

    Recent studies in JT-60U to establish physics base of a steady-state tokamak reactor are presented. High fusion performance with fusion triple product {ital n}{sub {ital D}}(0){tau}{sub {ital ET}}{sub {ital i}}(0)=1.2{times}10{sup 21} keVsm{sup {minus}3} (equivalent {ital Q}{sub {ital DT}}=0.6) has been achieved transiently in the high {beta}{sub {ital p}} {ital H}-mode regime. By optimizing the current and pressure profiles, a quasi steady-state high {beta}{sub {ital p}} {ital H}-mode with {ital n}{sub {ital D}}(0){tau}{sub {ital ET}}{sub {ital i}}(0)=(0.4{minus}0.5){times}10{sup 21} keVsm{sup {minus}3} (equivalent {ital Q}{sub {ital DT}}=0.25{minus}0.36) was maintained for up to 1.5 s. In order to maintain such high fusion performance discharges for a long time, non-inductive current drives and their capability of profile control were widely examined in the JT-60U tokamak. High-power ({approximately}7 MW) lower hybrid current drive (LHCD) experiments were performed by using a simplified multijunction launcher. A driven current of 3.6 MA has been achieved with a current drive efficiency of (0.3{minus}0.35){times}10{sup 20} m{sup {minus}2}A/W. Neutral beam current drive (NBCD) was also studied by using co/counter and on/off axis tangential beams ({approximately}4 MW). The maximum driven current and the current drive efficiency were 0.55 MA and 0.06{times}10{sup 20} m{sup {minus}2}A/W, respectively. Capability to control the current profile by LHCD and NBCD with a wide range of the plasma current was verified. Fully non-inductively driven discharges ({ital Ip}{le}1 MA) with good energy confinement ({tau}{sub {ital E}}/{tau}{sub {ital E}}{sup ITER89P}{le}2.5) and a high fraction of the bootstrap current ({ital I}{sub {ital BS}}/{ital I}{sub {ital p}}=0.6{minus}0.7) have been obtained with NBCD and/or LHCD. These results emphasized an importance of the profile control to obtain highly integrated tokamak performance. (Abstract Truncated)

  2. Reactor relevant current drive and heating by N-NBI on JT-60U

    NASA Astrophysics Data System (ADS)

    Oikawa, T.; Kamada, Y.; Isayama, A.; Fujita, T.; Suzuki, T.; Umeda, N.; Kawai, M.; Kuriyama, M.; Grisham, L. R.; Ikeda, Y.; Kajiwara, K.; Ushigusa, K.; Tobita, K.; Morioka, A.; Takechi, M.; Itoh, T.; JT-60 Team

    2001-11-01

    The current drive capability of negative ion based neutral beam injection (N-NBI) in JT-60U has been extended to the reactor relevant regime. The driven current profile and current drive efficiency have been evaluated in a high electron temperature regime Te(0) approx 10 keV, and reasonable agreement with the theoretical prediction has been confirmed in this regime. The N-NB driven current reached 1 MA with an injection power of 3.75 MW at a beam energy of 360 keV. A current drive efficiency of 1.55 × 1019A m-2 W-1, approaching the ITER requirement, was achieved in the high ?p H mode plasma with Te(0) approx 13 keV. This current drive performance permitted sustainment of a high beta (?N = 2.5) and high confinement (HHy2 = 1.4) plasma in the full current driven condition at a plasma current of 1.5 MA. The influence of instabilities on the N-NBI current drive was studied. When a burst-like instability driven by N-NBI occurred in the central region, reductions in loop voltage near the magnetic axis and in the neutron production rate due to loss of beam ions were observed although the lost driven current was at most ~7% of the total driven current. When a neoclassical tearing instability appeared in high beta plasmas, the loss of beam ions was enhanced with increasing instability activity.

  3. Roles of argon seeding in energy confinement and pedestal structure in JT-60U

    NASA Astrophysics Data System (ADS)

    Urano, H.; Nakata, M.; Aiba, N.; Kubo, H.; Honda, M.; Hayashi, N.; Yoshida, M.; Kamada, Y.; the JT-60 Team

    2015-03-01

    The mechanism of improving energy confinement with argon seeding at high density has been investigated in JT-60U. Better confinement is sustained at high density by argon seeding accompanied by higher core and pedestal temperatures. The electron density profiles become flatter with increasing density in conventional H-mode plasmas, whereas peaked density profiles are maintained with argon seeding. Density peaking and dilution effects lower the pedestal density at a given averaged density. The pedestal density in the argon seeded plasmas, which is lower than that in plasmas with deuterium puff, enables the pedestal temperature to be higher, whereas the increase in the pedestal pressure with argon seeding is small. High pedestal temperature is a boundary condition for high core temperature through profile stiffness, which leads to better confinement with argon seeding. The density peaking is a key factor of sustaining better confinement in argon seeded H-mode plasmas. The radiative loss power density is predominantly enhanced in the edge region by argon puff. The role of argon seeding in the pedestal characteristics has also been examined. The pedestal width becomes larger continuously with edge collisionality, but is nearly independent of the presence of argon seeding.

  4. Pressure transfer function of a JT15D nozzle due to acoustic and convected entropy fluctuations

    NASA Technical Reports Server (NTRS)

    Miles, J. H.

    1982-01-01

    An acoustic transmission matrix analysis of sound propagation in a variable area duct with and without flow is extended to include convected entropy fluctuations. The boundary conditions used in the analysis are a transfer function relating entropy and pressure at the nozzle inlet and the nozzle exit impedance. The nozzle pressure transfer function calculated is compared with JT15D turbofan engine nozzle data. The one dimensional theory for sound propagation in a variable area nozzle with flow but without convected entropy is good at the low engine speeds where the nozzle exit Mach number is low (M=0.2) and the duct exit impedance model is good. The effect of convected entropy appears to be so negligible that it is obscured by the inaccuracy of the nozzle exit impedance model, the lack of information on the magnitude of the convected entropy and its phase relationship with the pressure, and the scatter in the data. An improved duct exit impedance model is required at the higher engine speeds where the nozzle exit Mach number is high (M=0.56) and at low frequencies (below 120 Hz).

  5. Removal of the deposition on JT-60 tile by nano-sec pulsed-laser irradiation

    NASA Astrophysics Data System (ADS)

    Sugiyama, K.; Sakawa, Y.; Tanabe, T.; Watanabe, D.; Shibahara, T.; Masaki, K.

    2010-10-01

    To clarify the property of tritium removal from carbon codeposition by using pulsed-laser induced desorption, hydrogen removal from co-deposits on JT-60 divertor tile using a fourth-harmonic emission (266 nm) of a nano-sec Nd:YAG laser was demonstrated. The threshold laser fluence for ablation was ˜0.3 J/cm 2, which was slightly higher compared to that of the pico-sec laser irradiation. The energy absorption coefficient for the nano-sec laser, which was obtained by fitting the removal rate by so-called Beer's law, was larger than the pico-sec laser. Since the time constant of thermal wave propagation into the target is of the order of nano-sec, such differences between nano- and pico-sec lasers could be attributed to thermal effects. The ablation threshold of the deposited layer was lower than that of a pure graphite, which could be attributed to the difference of thermal conductivity between deposited layer and pure graphite. The removal rate of the nano-sec laser was higher than that of pico-sec laser in the fluence range of >˜0.5 J/cm 2. On the other hand, the production ratio [hydrocarbon species]/[H 2] continuously increased with the laser fluence, and no significant ionization of carbon was observed in this fluence range. This indicated that the fluence range in this study was "weak"-ablation range, which was still not sufficient to minimize the hydrocarbon production.

  6. Performance deterioration based on in-service engine data: JT9D jet engine diagnostics program

    NASA Technical Reports Server (NTRS)

    Sallee, G. P.

    1979-01-01

    Results of analyses of engine performance deterioration trends and levels with respect to service usage are presented. Thirty-two JT9D-7A engines were selected for this purpose. The selection of this engine fleet provided the opportunity of obtaining engine performance data starting before the first flight through initial service such that the trend and levels of engine deterioration related to both short and long term deterioration could be more carefully defined. The performance data collected and analyzed included in-flight, on wing (ground), and test stand prerepair and postrepair performance calibrations with expanded instrumentation where feasible. The results of the analyses of these data were used to: (1) close gaps in previously obtained historical data as well as augment the historical data with more carefully obtained data; (2) refine preliminary models of performance deterioration with respect to usage; (3) establish an understanding of the relationships between ground and altitude performance deterioration trends; (4) refine preliminary recommendations concerning means to reduce and control deterioration; and (5) identify areas where additional effort is required to develop an understanding of complex deterioration issues.

  7. Influence of plasma wall interactions on the behaviour of ELMs in JT-60U

    NASA Astrophysics Data System (ADS)

    Chankin, A. V.; Asakura, N.; Fukuda, T.; Isayama, A.; Itami, K.; Kamada, Y.; Kubo, H.; Miura, Y.; Nakano, T.; Oyama, N.; Takeji, S.; Takenaga, H.

    2003-03-01

    In JT-60U, extensive plasma-neutral interaction during type I edge localized modes (ELMs) leads to a transient increase in the edge plasma density, seen as spikes of a few ms duration on the inner vertical interferometer channel (FIR1). The spikes can reach up to ˜40% of the pre-ELM level of the FIR1 signal, in the case of giant ELMs. Fast edge measurements revealed that these density spikes are caused by ionisation of neutrals circulating between the plasma and the wall, as a result of the ELM particle and heat load onto the target. The increase in the edge density is more or less equally divided between the scrape-off layer (SOL) and outer core region, but is outside of the top of the H-mode pedestal. Prompt ionisation of neutrals and the increase in the plasma density around the separatrix position may affect the edge MHD stability, as often manifested by the occurrence of a second, satellite ELM triggered at lower pedestal temperature and pressure, clusters of type III ELMs or periods of L-mode. Both the magnitude of the density spikes and the observed changes in the ELM behaviour were found to depend on the wall conditions.

  8. Titanium carbide coating on inconel 625 liner for JT-60 BY HCD-ARE

    NASA Astrophysics Data System (ADS)

    Inagawa, K.; Watanabe, K.; Tanaka, I.; Itoh, A.; Abe, T.; Murakami, Y.; Mizoguchi, T.; Itou, Y.

    1984-12-01

    The HCD-ARE (activated reactive evaporation using a hollow cathode discharge) method was applied to coat the TiC layer, being a low Z material, on the full-size Inconel 625 liner for JT-60 with the aim of ascertaining its capability of mass-productive coating and further of supplying suitable products which satisfy the properties required from fusion devices. The film was deposited at the substrate temperature of 500°C using an in-line evaporation system consisting of four vacuum chambers. The characteristics of the films are nearly equal to each other over the whole area of the sample liner. The deposited films of about 20 ?m thick and a nearly stoichiometric composition show a preferred orientation in the (220) direction and the value of their line half-width is 0.23 0.26 deg. The lattice constants are nearly equal to those of the bulk crystal. By XPS observation the chemical shifts in C1s and Ti 2p{sol3}/{2} binding of the TiC film were about -3 and +1 eV which are nearly equal to those of the single crystal, respectively. As a result of convenient valuation of the durability of coatings, TiC film exhibiting a strong adhesion and an adequate durability was obtained by the HCD-ARE method.

  9. An alpha2,6-sialyltransferase cloned from Photobacterium leiognathi strain JT-SHIZ-119 shows both sialyltransferase and neuraminidase activity.

    PubMed

    Mine, Toshiki; Katayama, Sakurako; Kajiwara, Hitomi; Tsunashima, Masako; Tsukamoto, Hiroshi; Takakura, Yoshimitsu; Yamamoto, Takeshi

    2010-02-01

    We cloned, expressed, and characterized a novel beta-galactoside alpha2,6-sialyltransferase from Photobacterium leiognathi strain JT-SHIZ-119. The protein showed 56-96% identity to the marine bacterial alpha2,6-sialyltransferases classified into glycosyltransferase family 80. The sialyltransferase activity of the N-terminal truncated form of the recombinant enzyme was 1477 U/L of Escherichia coli culture. The truncated recombinant enzyme was purified as a single band by sodium dodecyl sulfate polyacrylamide gel electrophoresis through 3 column chromatography steps. The enzyme had distinct activity compared with known marine bacterial alpha2,6-sialyltransferases. Although alpha2,6-sialyltransferases cloned from marine bacteria, such as Photobacterium damselae strain JT0160, P. leiognathi strain JT-SHIZ-145, and Photobacterium sp. strain JT-ISH-224, show only alpha2,6-sialyltransferase activity, the recombinant enzyme cloned from P. leiognathi strain JT-SHIZ-119 showed both alpha2,6-sialyltransferase and alpha2,6-linkage-specific neuraminidase activity. Our results provide important information toward a comprehensive understanding of the bacterial sialyltransferases belonging to the group 80 glycosyltransferase family in the CAZy database. PMID:19797322

  10. Plasma Equilibrium and Confinement in a Tokamak with Nearly Zero Central Current Density in JT-60U

    NASA Astrophysics Data System (ADS)

    Fujita, T.; Oikawa, T.; Suzuki, T.; Ide, S.; Sakamoto, Y.; Koide, Y.; Hatae, T.; Naito, O.; Isayama, A.; Hayashi, N.; Shirai, H.

    2001-12-01

    A high confinement equilibrium with nearly zero toroidal current in the central region (a ``current hole'') has been observed for the first time to persist stably for several seconds in the JT-60U tokamak. This observation indicates the possibility of stable tokamak operation without central toroidal current; the central current has previously been believed to be necessary in tokamaks. The radius of the current hole extended up to 40% of the plasma minor radius. It was observed that the current hole was formed by the increase of the off-axis noninductive current.

  11. Plasma equilibrium and confinement in a tokamak with nearly zero central current density in JT-60U.

    PubMed

    Fujita, T; Oikawa, T; Suzuki, T; Ide, S; Sakamoto, Y; Koide, Y; Hatae, T; Naito, O; Isayama, A; Hayashi, N; Shirai, H

    2001-12-10

    A high confinement equilibrium with nearly zero toroidal current in the central region (a "current hole") has been observed for the first time to persist stably for several seconds in the JT-60U tokamak. This observation indicates the possibility of stable tokamak operation without central toroidal current; the central current has previously been believed to be necessary in tokamaks. The radius of the current hole extended up to 40% of the plasma minor radius. It was observed that the current hole was formed by the increase of the off-axis noninductive current. PMID:11736508

  12. Effect of ceramic coating of JT8D combustor liner on maximum liner temperatures and other combustor performance parameters

    NASA Technical Reports Server (NTRS)

    Butze, H. F.; Liebert, C. H.

    1976-01-01

    The effect of ceramic coating of a JT8D combustor liner was investigated at simulated cruise and takeoff conditions with two fuels of widely different aromatic contents. Substantial decreases in maximum liner temperatures and flame radiation values were obtained with the ceramic-coated liner. Small reductions in exhaust gas smoke concentrations were observed with the ceramic-coated liner. Other performance parameters such as combustion efficiency and emissions of unburned hydrocarbons, CO, and NOx were not affected significantly. No deterioration of the ceramic coating was observed after about 6 hours of cyclic operation including several startups and shutdowns.

  13. Stiff Temperature Profiles in JT-60U ELMy H-mode Plasmas

    SciTech Connect

    D.R. Mikkelsen; H. Urano; H. Shirai; T. Takizuka; Y. Kamada; T. Hatae; Y. Koide; N. Asakura; T. Fujita; T. Fukuda; S. Ide; A. Isayama; Y. Kawano; O. Naito; Y. Sakamoto

    2001-10-16

    The 'stiffness' of thermal transport in ELMy H-modes [edge localized high-confinement modes] is examined in a series of carefully chosen JT-60U plasmas, and measured temperatures are compared with the predictions of several transport models. A heating power scan with constant T(subscript ''ped''), a scan of pedestal temperature, T(subscript ''ped''), with constant heating power, and an on-axis/off-axis heating comparison are presented. In the power scan a 45% increase in heating (and a 12% density rise) produces an approximately fixed core temperature profile in a group of five plasmas with the same pedestal temperature. With fixed heating power, we find that a 30-40% increase in T(subscript ''ped'') is associated with similar increases in core temperature. Heating in the deep core is varied by employing different groups of neutral beams that deposit their power near the magnetic axis and farther from the axis. In these plasmas, on-axis heating produces slightly more peaked temperature profiles, although they have 60% more heating power inside r = a/2. Transport models are tested by solving the power balance equations to predict temperatures, which are then compared to the measurements. Predictions of the RLWB and IFS/PPPL models generally agree with the measured temperatures outside r approximately 0.3a, but the multimode model uniformly predicts temperatures that are too high except in the central region. Tests based on these discharges are not able to discriminate between the transport models of varying stiffness, so we conclude that larger changes are needed in the P(subscript ''heat'') and T(subscript ''ped'') scans.

  14. Development and Operation of the Lower Hybrid Range of Frequency System on JT-60U

    SciTech Connect

    Seki, M.; Ikeda, Y.; Maebara, S.; Moriyama, S.; Naito, O.; Anno, K.; Hiranai, S.; Shimono, M.; Shinozaki, S.; Terakado, M.; Yokokura, K.; Yamamoto, T.; Fujii, T. [Japan Atomic Energy Research Institute (Japan)

    2002-09-15

    Development and operation of a lower hybrid range of frequency (LHRF) system for JT-60U are presented. The LHRF system was constructed in 1986 to study current drive and plasma heating at high injection power. Its main specifications are the total output power 24 MW with 24 high power klystrons, the frequency 1.74 to 2.23 GHz, and the injection power {approx}10 MW with three conventional antennas. To improve the antenna capabilities such as the current drive efficiency, N{sub //peak} controllability and the power injection properties, a 3-divided multi-junction type (CD1' launcher) and a 12-divided multi-junction type (CD2 launcher) are developed. The CD2 launcher can also reduce the number of the transmission lines to one fourth of the original system. The injection power {approx}7 MW is attained, and then the highest current drive efficiency 3.5 x 10{sup 19} m{sup -2}AW{sup -1} and the highest non-inductive driven current 3.6 MA are achieved. The high power klystron capable of the cathode-heater operation times more than 3000 hours is improved. The outgassing rate is estimated with the CD2 launcher as 1-10 x 10{sup -6} Pam{sup 3}/sm{sup 2}, which is sufficiently small not to need the vacuum pumping system for the launcher. Heat load onto the launcher due to the ripple enhanced banana drift loss is first observed in NBI or ICRF heating. From investigation on antenna-plasma coupling, the gas puffing improves distant coupling.

  15. Compact antenna for two-dimensional beam scan in the JT-60U electron cyclotron heating/current drive system

    SciTech Connect

    Moriyama, S.; Kajiwara, K.; Takahashi, K.; Kasugai, A.; Seki, M.; Ikeda, Y.; Fujii, T. [Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, Mukoyama 801-1, Naka-shi, Ibaraki 311-0193 (Japan)

    2005-11-15

    A compact antenna system was designed and fabricated to enable millimeter-wave beam scanning in the toroidal and poloidal directions of the JT-60U tokamak for electron cyclotron heating (ECH) and electron cyclotron current drive (ECCD) experiments. The antenna consists of a fast movable flat mirror mounted on the tokamak vacuum vessel and a rotary focusing mirror attached at the end of the waveguide that is supported from outside the vacuum vessel. This separate support concept enables a compact structure inside a shallow port (0.68x0.54x0.2 m) that is shared with a subport for an independent diagnostic system. During a plasma shot, the flat mirror is driven by a servomotor with a 3-m-long drive shaft to reduce the influence of the high magnetic field on the motor. The focusing mirror is rotated by a simple mechanism utilizing a push rod and an air cylinder. The antenna has been operated reliably for 3 years after a small improvement to the rotary drive mechanism. It has made significant contributions to ECH and ECCD experiments, especially the current profile control in JT-60U.

  16. Measurement of deuterium and tritium retentions on the surface of JT-60 divertor tiles by means of nuclear reaction analysis

    NASA Astrophysics Data System (ADS)

    Ochiai, K.; Hayashi, T.; Kutsukake, C.; Gotoh, Y.; Masaki, K.; Arai, T.; Miya, N.; Nishitani, T.

    2004-08-01

    It is important to measure retentions and depth profiles of deuterium and tritium on plasma facing materials to understand plasma-wall interactions. The nuclear reaction analysis (NRA) has been established using a deuteron beam with an adjustable energy. By means of the NRA, depth profiles of deuterium and tritium on the surface of JT-60 divertor graphite tiles irradiated with DD burning were obtained. The NRA method showed that the average concentrations of the deuterium retained in the surface of two different were 1.3 × 10 16 and 0.3 × 10 16 cm -2. ?-particles from the T(d, ?)n reaction were measured from a dome unit tile of JT-60U W-shaped divertor and the measured activity of tritium was about 18 kBq/cm 2. The peak energy of the ? spectrum obtained with the NRA was about 1.2 MeV. This result implies that energetic tritons were implanted in the divertor graphite tile.

  17. Development of a closed-loop J-T cryoablation device with a long cooling area and multiple expansion parts.

    PubMed

    Lee, Cheonkyu; Baek, Seungwhan; Lee, Jisung; Hwang, Gyuwan; Jeong, Sangkwon; Park, Sang Woo

    2014-11-01

    Cryoablation is a surgical procedure used to freeze defective cells by inserting a low temperature probe into a human body to destroy malignant tissues. Miniaturized Joule-Thomson (J-T) refrigerators are often used to minimize the volume of the cooling device and reduce the destruction zone of normal tissue. The cooling effects of the existing probes are not uniformly generated along the longitudinal direction of the probe, which makes their applications less effective in surgeries of incompetent great saphenous veins (GSVs), where the target cells are distributed over a broad range. Long uniform refrigeration is required across the entire area of the probe to apply the same cooling effects. In this paper, a closed-loop J-T cryoablation probe was designed and fabricated to provide uniform refrigeration over a large area, with multiple expansion parts. Using flow boiling heat transfer, uniform cooling of a 200 mm-long and 0.3 mm thickness piece of target tissue was possible and simulated in a gelatin solution. The developed probe produced a greater than 53 K min(-1) cooling rate and the cooling temperature was below 253 K to satisfy the required cell death conditions. PMID:25164379

  18. Variational Bayes for Elaborate Distributions BY M.P. WAND1, J.T. ORMEROD2, S.A. PADOAN3 & R. FR UHWIRTH4

    E-print Network

    Sydney, University of

    Variational Bayes for Elaborate Distributions BY M.P. WAND1, J.T. ORMEROD2, S.A. PADOAN3 & R. FR develop strategies for variational Bayes approximate inference for models con- taining elaborate Extreme Value distribution; Quadrature; Skew Normal Distribution. 1 Introduction Variational Bayes refers

  19. Load Pocket Forecasting Software E. A. Feinberg, D. Genethliou, J.T. Hajagos, B.G. Irrgang, and R. J. Rossin

    E-print Network

    Feinberg, Eugene A.

    1 Load Pocket Forecasting Software E. A. Feinberg, D. Genethliou, J.T. Hajagos, B.G. Irrgang, and R. J. Rossin Abstract--In this paper we describe the load pocket forecasting software that can be used by electric utilities to estimate and forecast the load growth in different service areas. The software builds

  20. 76 FR 5066 - Airworthiness Directives; Pratt & Whitney JT8D-7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-01-28

    ...17R, and -17AR series turbofan engines...manufacturer's time limits section...parts of PW JT8D series turbofan engines...within the compliance times specified unless...1) revise the Time Limits Section...17R, and -17AR series turbofan...

  1. 75 FR 50942 - Airworthiness Directives; Pratt & Whitney JT8D-7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-08-18

    ...17R, and -17AR series turbofan engines...manufacturer's time limits section...parts of PW JT8D series turbofan engines...within the compliance times specified unless...1) revise the Time Limits Section...17R, and -17AR series turbofan...

  2. INTEGRATION OF SQUID l/f NOISE AND ITS APPLICATION TO A SUPERCONDUCTING GYROSCOPE J.T. Anderson and B. Cabrera

    E-print Network

    Paris-Sud XI, Université de

    INTEGRATION OF SQUID l/f NOISE AND ITS APPLICATION TO A SUPERCONDUCTING GYROSCOPE J.T. Anderson Abstract.- SQUID noise in the 1/f noise region was integrated for 140 hours in a narrow frequency band. INTRODUCTION.- SQUID magnetometers exhibit increa- sing noise power at low frequencies /l/ which tends to rise

  3. Active Control of Inlet Noise on the JT15D Turbofan Engine

    NASA Technical Reports Server (NTRS)

    Smith, Jerome P.; Hutcheson, Florence V.; Burdisso, Ricardo A.; Fuller, Chris R.

    1999-01-01

    This report presents the key results obtained by the Vibration and Acoustics Laboratories at Virginia Tech over the year from November 1997 to December 1998 on the Active Noise Control of Turbofan Engines research project funded by NASA Langley Research Center. The concept of implementing active noise control techniques with fuselage-mounted error sensors is investigated both analytically and experimentally. The analytical part of the project involves the continued development of an advanced modeling technique to provide prediction and design guidelines for application of active noise control techniques to large, realistic high bypass engines of the type on which active control methods are expected to be applied. Results from the advanced analytical model are presented that show the effectiveness of the control strategies, and the analytical results presented for fuselage error sensors show good agreement with the experimentally observed results and provide additional insight into the control phenomena. Additional analytical results are presented for active noise control used in conjunction with a wavenumber sensing technique. The experimental work is carried out on a running JT15D turbofan jet engine in a test stand at Virginia Tech. The control strategy used in these tests was the feedforward Filtered-X LMS algorithm. The control inputs were supplied by single and multiple circumferential arrays of acoustic sources equipped with neodymium iron cobalt magnets mounted upstream of the fan. The reference signal was obtained from an inlet mounted eddy current probe. The error signals were obtained from a number of pressure transducers flush-mounted in a simulated fuselage section mounted in the engine test cell. The active control methods are investigated when implemented with the control sources embedded within the acoustically absorptive material on a passively-lined inlet. The experimental results show that the combination of active control techniques with fuselage-mounted error sensors and passive control techniques is an effective means of reducing radiated noise from turbofan engines. Strategic selection of the location of the error transducers is shown to be effective for reducing the radiation towards particular directions in the farfield. An analytical model is used to predict the behavior of the control system and to guide the experimental design configurations, and the analytical results presented show good agreement with the experimentally observed results.

  4. Numerical modeling of a 2K J-T heat exchanger used in Fermilab Vertical Test Stand VTS-1

    SciTech Connect

    Gupta, Prabhat Kumar [Raja Ramanna Centre for Advanced Technology (RRCAT), Indore (MP), India; Rabehl, Roger [FNAL

    2014-07-01

    Fermilab Vertical Test Stand-1 (VTS-1) is in operation since 2007 for testing the superconducting RF cavities at 2 K. This test stand has single layer coiled finned tubes heat exchanger before J-T valve. A finite difference based thermal model has been developed in Engineering Equation Solver (EES) to study its thermal performance during filling and refilling to maintain the constant liquid level of test stand. The model is also useful to predict its performance under other various operating conditions and will be useful to design the similar kind of heat exchanger for future needs. Present paper discusses the different operational modes of this heat exchanger and its thermal characteristics under these operational modes. Results of this model have also been compared with the experimental data gathered from the VTS-1 heat exchanger and they are in good agreement with the present model.

  5. Properties of hydrogen desorption from co-deposits on JT-60 graphite tile by pulsed-laser ablation

    NASA Astrophysics Data System (ADS)

    Watanabe, D.; Sakawa, Y.; Shibahara, T.; Sugiyama, K.; Shoji, T.; Yamazaki, K.; Tanabe, T.

    2007-06-01

    For the purpose of tritium removal from carbon co-deposits on plasma-facing material of fusion device, pulsed-laser induced desorption of hydrogen from co-deposits on JT-60 open-divertor tile has been investigated. The fundamental (1064 nm) and fourth harmonic (266 nm) emission of a 20 ps-Nd: YAG laser were used, and dependences of hydrogen desorption on laser intensity IL and wavelength ? were studied. Hydrogen-desorption efficiency, defined as the ratio between the number of desorbed hydrogen by laser irradiation and that of hydrogen retained in the ablated volume, was largest in the region, where strong ionization of C+ occurred, and was larger for ? = 266 nm, in which a laser photon can cut C-H bond, compared with that for ? = 1064 nm. For the ablative removal of hydrogen, a short-wavelength and high-power laser is desirable.

  6. Use of an air-assisted fuel nozzle to reduce idle emissions of a jt8d engine combustor

    NASA Technical Reports Server (NTRS)

    Papathakos, L. C.; Jones, R. E.

    1973-01-01

    Tests were performed at typical engine idle conditions on a single-can JT8D combustor installed in a 24 centimeter (9.45 in.) housing to evaluate the effect of an air-assist nozzle on reducing exhaust emissions. By injecting high-pressure air through the secondary-flow passage of a standard duplex fuel nozzle, it was possible to reduce hydrocarbon emissions from 840 parts per million to 95 parts per million and carbon monoxide emissions from 873 parts per million to 258 parts per million. NOX emissions increased slightly from 18 parts per million to 22 parts per million. An air-assist differential pressure of only 20.1 newtons per square centimeter (29.1 psi) and an airflow rate of only 0.22 percent of the total combustor airflow was required.

  7. Beamlet deflection due to beamlet-beamlet interaction in a large-area multiaperture negative ion source for JT-60U

    SciTech Connect

    Kamada, M.; Hanada, M.; Ikeda, Y.; Grisham, L. R.; Jiang, W. [Japan Atomic Energy Agency, 801-1 Mukoyama, Naka, Ibaraki 311-0193 (Japan); Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543 (United States); Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188 (Japan)

    2008-02-15

    The JT-60U negative ion source has been designed to produce high current beams of 22 A through grids of 1080 apertures (five segments with nine rows of 24 apertures). One of the key issues is to steer such a high current beam through the multiaperture grids in order to focus the overall beam envelope because the beamlet-beamlet interaction may deflect the outer beamlets outward due to unbalanced space charge repulsion. To clarify the beam deflection in the JT-60U negative ion source, the beamlet trajectory in a multiaperture ion source was calculated by a three-dimensional simulation code. The measured angles of the outmost beamlets were in agreement with the calculated results where space charge of the beamlets was taken into account. It is noticed that the deflection of the outermost beamlet due to the beamlet-beamlet interaction is saturated at 5.2 mrad outward for beamlets more than ten.

  8. Biological Control of Annual Bluegrass ( Poa annuaL.) with a Japanese Isolate of Xanthomonas campestrispv. poae(JT-P482)

    Microsoft Academic Search

    S. Imaizumi; T. Nishino; K. Miyabe; T. Fujimori; M. Yamada

    1997-01-01

    To select a biological control agent for annual bluegrass (Poa annua), 14 isolates ofXanthomonas campestrispv.poae,isolated from annual bluegrass in prefectures throughout Japan, were compared for pathogenicity and then examined for their safety toward desirable turf grasses such as creeping bentgrass (Agrostis palustris) and Kentucky bluegrass (Poa pratensis). One isolate, JT-P482, was found to be the most effective pathogen of annual

  9. Effect of Temperature on the Control of Annual Bluegrass ( Poa annua L.) with Xanthomonas campestris pv. poae (JT-P482)

    Microsoft Academic Search

    S. Imaizumi; M. Honda; T. Fujimori

    1999-01-01

    A host-specific pathogen, Xanthomonas campestris pv. poae (JT-P482), which causes lethal wilting of annual bluegrass (Poa annua), was isolated in 1993 and has since been developed and commercialized as a bioherbicide in Japan. The effectiveness of X. campestris pv. poae against annual bluegrass is significantly affected by temperature. To determine the optimum temperature for maximum control, the relationship between the

  10. Engineering study of the neutral beam and rf heating systems for DIII-D, MFTF-B, JET, JT-60 and TFTR

    SciTech Connect

    Lindquist, W.B.; Staten, S.H.

    1987-01-01

    An engineering study was performed on the rf and neutral beam heating systems implemented for DIII-D, MFTF-B, JET, JT-60 and TFTR. Areas covered include: methodology used to implement the systems, technology, cost, schedule, performance, problems encountered and lessons learned. Systems are compared and contrasted in the areas studied. Summary statements were made on common problems and lessons learned. 3 refs., 6 tabs.

  11. Development of a dual frequency (110/138 GHz) gyrotron for JT-60SA and its extension to an oscillation at 82 GHz

    NASA Astrophysics Data System (ADS)

    Kobayashia, Takayuki; Moriyama, Shinichi; Isayama, Akihiko; Sawahata, Masayuki; Terakado, Masayuki; Hiranai, Shinichi; Wada, Kenji; Sato, Yoshikatsu; Hinata, Jun; Yokokura, Kenji; Hoshino, Katsumichi; Sakamoto, Keishi

    2015-03-01

    A dual-frequency gyrotron, which can generate 110 GHz and 138 GHz waves independently, is being developed in JAEA to enable electron cyclotron heating (ECH) and current drive (ECCD) in a wider range of plasma discharge conditions of JT-60SA. Conditioning operation of the gyrotron toward 1 MW for 100 s, which is the target output power and pulse length for JT-60SA, is in progress without significant problems. Oscillations of 1 MW for 10 s and 0.5 MW for 198 s were obtained, so far, at both frequencies. Cooling water temperatures in the gyrotron and matching optics unit were saturated in the 198 s oscillation, and the observed maximum water temperature is sufficiently low. In addition to the above activity on the dual-frequency gyrotron development, an oscillation (0.3 MW for 20 ms) at 82 GHz was demonstrated as an additional frequency of the dual-frequency gyrotron. A possibility of the use of fundamental harmonic wave at 82 GHz in JT-60SA has been shown.

  12. Optical designs of reflection and refraction collection optics for a JT-60SA core Thomson scattering system

    NASA Astrophysics Data System (ADS)

    Tojo, H.; Hatae, T.; Hamano, T.; Sakuma, T.; Itami, K.

    2013-09-01

    Collection optics for core measurements in a JT-60SA Thomson scattering system were designed. The collection optics will be installed in a limited space and have a wide field of view and wide wavelength range. Two types of the optics are therefore suggested: refraction and reflection types. The reflection system, with a large primary mirror, avoids large chromatic aberrations. Because the size limit of the primary mirror and vignetting due to the secondary mirror affect the total collection throughput, conditions that provide the high throughput are found through an optimization. A refraction system with four lenses forming an Ernostar system is also employed. The use of high-refractive-index glass materials enhances the freedom of the lens curvatures, resulting in suppression of the spherical and coma aberration. Moreover, sufficient throughput can be achieved, even with smaller lenses than that of a previous design given in [H. Tojo, T. Hatae, T. Sakuma, T. Hamano, K. Itami, Y. Aida, S. Suitoh, and D. Fujie, Rev. Sci. Instrum. 81, 10D539 (2010)]. The optical resolutions of the reflection and refraction systems are both sufficient for understanding the spatial structures in plasma. In particular, the spot sizes at the image of the optics are evaluated as {˜}0.3 mm and {˜}0.4 mm, respectively. The throughput for the two systems, including the pupil size and transmissivity, are also compared. The results show that good measurement accuracy (<10%) even at high electron temperatures ({<}30 keV) can be expected in the refraction system.

  13. Zeeman polarimetry measurement for edge current density determination using Li-beam probe on JT-60U

    NASA Astrophysics Data System (ADS)

    Kamiya, K.; Fujita, T.; Kojima, A.; Kubo, H.

    2010-03-01

    Zeeman polarimetry system using Li-beam probe has been developed for the edge current density measurement in the JT-60U tokamak, which measures the polarization angle ? (related to the pitch angle of the magnetic field) by means of photoelastic modulators, etalons, and phase sensitive detection using digital lock-in amplifiers with the accuracy in the ? of ?? ˜0.1°. The diagnostic has 20-channel viewing chords covering the plasma peripheral region of normalized minor radius r /a˜0.8-1 with a spatial resolution of up to ˜1 cm. Li-beam injection with beam current of up to ˜5 mA has been achieved. A new tuning method of the wavelength for the etalon has been demonstrated, scanning the beam acceleration voltage and keeping a beam current constant during a single shot. The peak wavelength of the etalon is adjusted in the direction to both blue- and redshifts by changing the angle of incidence and increasing the temperature, respectively. Time evolution of the edge current density profile has been determined for the current ramp experiment in the Ohmically heated discharges. In addition, the edge current density profile with the local peak of jped˜0.15-0.25 MA/m2 at r /a˜0.9 has been identified in the H-mode plasma, which is correlated with large pressure gradient in the pedestal region.

  14. Titanium honeycomb acoustic lining structural and thermal test report. [for acoustic tailpipe for JT8D engine

    NASA Technical Reports Server (NTRS)

    Joynes, D.; Balut, J. P.

    1974-01-01

    The results are presented of static, fatigue and thermal testing of titanium honeycomb acoustic panels representing the acoustic tailpipe for the Pratt and Whitney Aircraft JT8D Refan engine which is being studied for use on the Boeing 727-200 airplane. Test specimens represented the engine and tailpipe flange joints, the rail to which the thrust reverser is attached and shear specimens of the tailpipe honeycomb. Specimens were made in four different batches with variations in configuration, materials and processes in each. Static strength of all test specimens exceeded the design ultimate load requirements. Fatigue test results confirmed that aluminum brazed titanium, as used in the Refan tailpipe design, meets the fatigue durability objectives. Quality of welding was found to be critical to life, with substandard welding failing prematurely, whereas welding within the process specification exceeded the panel skin life. Initial fatigue testing used short grip length bolts which failed prematurely. These were replaced with longer bolts and subsequent testing demonstrated the required life. Thermal tests indicate that perforated skin acoustic honeycomb has approximately twice the heat transfer of solid skin honeycomb.

  15. Zeeman polarimetry measurement for edge current density determination using Li-beam probe on JT-60U

    SciTech Connect

    Kamiya, K.; Fujita, T.; Kojima, A.; Kubo, H. [Japan Atomic Energy Agency (JAEA), Naka, Ibaraki 311-0193 (Japan)

    2010-03-15

    Zeeman polarimetry system using Li-beam probe has been developed for the edge current density measurement in the JT-60U tokamak, which measures the polarization angle {alpha} (related to the pitch angle of the magnetic field) by means of photoelastic modulators, etalons, and phase sensitive detection using digital lock-in amplifiers with the accuracy in the {alpha} of {Delta}{alpha}{approx}0.1 deg. The diagnostic has 20-channel viewing chords covering the plasma peripheral region of normalized minor radius r/a{approx}0.8-1 with a spatial resolution of up to {approx}1 cm. Li-beam injection with beam current of up to {approx}5 mA has been achieved. A new tuning method of the wavelength for the etalon has been demonstrated, scanning the beam acceleration voltage and keeping a beam current constant during a single shot. The peak wavelength of the etalon is adjusted in the direction to both blue- and redshifts by changing the angle of incidence and increasing the temperature, respectively. Time evolution of the edge current density profile has been determined for the current ramp experiment in the Ohmically heated discharges. In addition, the edge current density profile with the local peak of j{sub ped}{approx}0.15-0.25 MA/m{sup 2} at r/a{approx}0.9 has been identified in the H-mode plasma, which is correlated with large pressure gradient in the pedestal region.

  16. Optical designs of reflection and refraction collection optics for a JT-60SA core Thomson scattering system

    SciTech Connect

    Tojo, H.; Hatae, T.; Hamano, T.; Sakuma, T.; Itami, K. [Japan Atomic Energy Agency, 801-1 Mukoyama, Naka 311-0193 (Japan)] [Japan Atomic Energy Agency, 801-1 Mukoyama, Naka 311-0193 (Japan)

    2013-09-15

    Collection optics for core measurements in a JT-60SA Thomson scattering system were designed. The collection optics will be installed in a limited space and have a wide field of view and wide wavelength range. Two types of the optics are therefore suggested: refraction and reflection types. The reflection system, with a large primary mirror, avoids large chromatic aberrations. Because the size limit of the primary mirror and vignetting due to the secondary mirror affect the total collection throughput, conditions that provide the high throughput are found through an optimization. A refraction system with four lenses forming an Ernostar system is also employed. The use of high-refractive-index glass materials enhances the freedom of the lens curvatures, resulting in suppression of the spherical and coma aberration. Moreover, sufficient throughput can be achieved, even with smaller lenses than that of a previous design given in [H. Tojo, T. Hatae, T. Sakuma, T. Hamano, K. Itami, Y. Aida, S. Suitoh, and D. Fujie, Rev. Sci. Instrum. 81, 10D539 (2010)]. The optical resolutions of the reflection and refraction systems are both sufficient for understanding the spatial structures in plasma. In particular, the spot sizes at the image of the optics are evaluated as ?0.3?mm and ?0.4?mm, respectively. The throughput for the two systems, including the pupil size and transmissivity, are also compared. The results show that good measurement accuracy (<10%) even at high electron temperatures (<30?keV) can be expected in the refraction system.

  17. Phase 2 program on ground test of refanned JT8D turbofan engines and nacelles for the 727 airplane. Volume 1: Summary

    NASA Technical Reports Server (NTRS)

    1975-01-01

    The propulsion performance, acoustic, structural, and systems changes to a 727-200 airplane retrofitted with a refan modification of the JT8D turbofan engine are evaluated. Model tests, design of certifiable airplane retrofit kit hardware, manufacture of test hardware, ground test of a current production JT8D engine, followed by test of the same engine modified to the refan configuration, detailed analyses of the retrofit impact on airplane airworthiness, performance, and noise, and a preliminary analysis of retrofit costs are included. Results indicate that the refan retrofit of the 727-200 would be certifiable and would result in a 6-to 8 EPNdb reduction in effective perceived noise level (EPNL) at the FAR 36 measuring points and an annoyance-weighted footprint area reduction of 68% to 83%. The installed refan engine is estimated to provide 14% greater takeoff thrust at zero velocity and 10% greater thrust at 100 kn (51.4 m/s). There would be an approximate 0.6% increase in cruise specific fuel consumption (SFC). The refan engine performance in conjunction with the increase in stalled weight results in a range reduction of approximately 15% over the unmodified airplane at the same brake release gross weight (BRGW), with a block fuel increase of 1.5% to 3%. With the particular model 727 that was studied, however, it is possible to operate the airplane (with minor structural modifications) at a higher BRGW and increase the range up to approximately 15% relative to the nonrefanned airplane (with equal or slightly increased noise levels). The JT8D refan engine also improves the limited-field range of the airplane.

  18. Isolation of the Improved Core Confinement from High Recycling and Radiative Boundary in Reversed Magnetic Shear Plasmas of JT-60U

    SciTech Connect

    Itami, K.; Yoshino, R.; Asakura, N.; Fujita, T.; Hosogane, N.; Naito, O.; Higashijima, S.; Konoshima, S.; Sakasai, A.; Takenaga, H.; Shimada, M. [Japan Atomic Energy Research Institute, Naka Fusion Research Establishment, Naka-machi, Naka-gun, Ibaraki-ken, 311-01 (Japan)] [Japan Atomic Energy Research Institute, Naka Fusion Research Establishment, Naka-machi, Naka-gun, Ibaraki-ken, 311-01 (Japan)

    1997-02-01

    Isolation of the core with improved confinement (inside the internal transport barrier) from high recycling and strongly radiative boundary plasmas was demonstrated for the first time in the reversed shear plasmas of the JT-60U tokamak. The internal transport barrier remained intact, while edge radiation and recycling was enhanced with neon and hydrogen gas puffing. The internal transport barrier reduced the particle transport by a factor 10{endash}15, while shrinking in the time scale of resistive diffusion towards the center. {copyright} {ital 1997} {ital The American Physical Society}

  19. Integrated modelling of toroidal rotation with the 3D non-local drift-kinetic code and boundary models for JT-60U analyses and predictive simulations

    NASA Astrophysics Data System (ADS)

    Honda, M.; Satake, S.; Suzuki, Y.; Yoshida, M.; Hayashi, N.; Kamiya, K.; Matsuyama, A.; Shinohara, K.; Matsunaga, G.; Nakata, M.; Ide, S.; Urano, H.

    2015-07-01

    The integrated simulation framework for toroidal momentum transport is developed, which self-consistently calculates the neoclassical toroidal viscosity (NTV), the radial electric field {{E}r} and the resultant toroidal rotation {{V}?} together with the scrape-off-layer (SOL) physics-based boundary model. The coupling of three codes, the 1.5D transport code TOPICS, the three-dimensional (3D) equilibrium code VMEC and the 3D ? f drift-kinetic equation solver FORTEC-3D, makes it possible to calculate the NTV due to the non-axisymmetric perturbed magnetic field caused by toroidal field coils. Analyses reveal that the NTV significantly influences {{V}?} in JT-60U and {{E}r} holds the key to determine the NTV profile. The sensitivity of the {{V}?} profile to the boundary rotation necessitates a boundary condition modelling for toroidal momentum. Owing to the high-resolution measurement system in JT-60U, the {{E}r} gradient is found to be virtually zero at the separatrix regardless of toroidal rotation velocities. Focusing on {{E}r} , the boundary model of toroidal momentum is developed in conjunction with the SOL/divertor plasma code D5PM. This modelling realizes self-consistent predictive simulations for operation scenario development in ITER.

  20. Design and development of a four-cell sorption compressor based J-T cooler using R134a as working fluid

    SciTech Connect

    Mehta, R. N. [Mechanical Engineering Department, Indian Institute of Technology Bombay, Mumbai - 400076, India and Government Engineering College Bharuch, Gujarat - 392002 (India); Bapat, S. L.; Atrey, M. D. [Mechanical Engineering Department, Indian Institute of Technology Bombay, Mumbai - 400076 (India)

    2014-01-29

    The need of a cooler with no electromagnetic interference and practically zero vibration has led to sorption compressor based Joule-Thomson (J-T) coolers. These are useful for sophisticated electronic, ground based and space borne systems. In a Sorption compressor, adsorbed gases are desorbed into a confined volume by raising temperature of the sorption bed resulting in an increase in pressure of the liberated gas. In order to have the system (compressor) functioning on a continuous basis, with almost a constant gas flow rate, multiple cells are used with the adaptation of Temperature Swing Adsorption (TSA) process. As the mass of the desorbed gas dictates the compressor throughput, a combination of sorbent material with high adsorption capacity for a chosen gas or gas mixture has to be selected for efficient operation of the compressor. Commercially available (coconut-shell base) activated carbon has been selected for the present application. The characterization study for variation of discharge pressure is used to design the Four-cell sorption compressor based cryocooler with a desired output. Apart from compressor, the system includes a) After cooler b) Return gas heat exchanger c) capillary tube as the J-T expansion device and d) Evaporator.

  1. Academic Advising & Career Centre: A team of professionals who advise, counsel and coach individuals with their learning and career development. September 2010, source; jt. Academic Advising & Career Centre. All Rights Reserved.

    E-print Network

    Boonstra, Rudy

    There are many different theories relating to learning styles. The styles described here will use the three individuals with their learning and career development. © September 2010, source; jt. Academic Advising & Career Centre. All Rights Reserved. Learning Styles Learning is important! Learning is a process which

  2. JOURNAL DE PHYSIQUE Colloque C6, supplment au n" 8, Tome 39, aot 1978, page C6-920 NUCLEAR ORIENTATION EXPERIMENTS ON DILUTE ALLOY OF j^t Mn

    E-print Network

    Paris-Sud XI, Université de

    , Au Fe alloys IM HI 131. We report here N.O. Studies on Pt Mn alloys on which the magnetization ORIENTATION EXPERIMENTS ON DILUTE ALLOY OF j^t Mn . ° °h ° . ° + ++ A. Benoit, W.D. Brewer , J . Flouquet, M recent nuclear orien- tation (N.O.) experiments with Mn probe have been performed on Ag Mn, Au Mn, Au Cr

  3. COGEDE 874 17 Please cite this article in press as: Huff JT, Zilberman D. Regulation of biological accuracy, precision, and memory by plant chromatin organization, Curr Opin Genet Dev (2012), doi:10.1016/

    E-print Network

    2012-01-01

    .gde.2012.01.007 Regulation of biological accuracy, precision, and memory by plant chromatin organization to achieve biological accuracy, precision, and memory. Address Department of Plant and Microbial BiologyCOGEDE 874 1­7 Please cite this article in press as: Huff JT, Zilberman D. Regulation of biological

  4. High repetition rate neutron flux array using digital-signal processing and scintillators for study of high performance plasma at JT-60U.

    PubMed

    Shinohara, K; Okuji, T; Ishikawa, M; Baba, M; Itoga, T

    2008-10-01

    Aiming at increasing the count rate capability of the radial neutron collimator system in JT-60U, a digital-signal processing system has been extended to seven channels for data acquisition of stilbene crystal detector using analog-to-digital converters equipped with a fast flash memory. In this method, the detected pulses were postprocessed concerning pulse shape and pulse height. Using this system, the radial neutron collimator system can provide the information on the temporal evolution of emission rate of d-T neutrons and gamma rays as well as d-D neutrons. On the course of the development, the fast and stable handling of the large data around 7 GB is undertaken for a discharge. PMID:19044494

  5. Tritium release behavior from the graphite tiles used at the dome unit of the W-shaped divertor region in JT-60U

    NASA Astrophysics Data System (ADS)

    Katayama, K.; Takeishi, T.; Manabe, Y.; Nagase, H.; Nishikawa, M.; Miya, N.

    2005-04-01

    Release behavior of tritium from the graphite tiles used at dome top and inner dome wing in JT-60U was investigated by the thermal desorption method in dry argon, argon with oxygen and water vapor, or argon with hydrogen. It was found that approximately 20-40% of total tritium is left in graphite even after heating to the high temperature above 1000 °C in dry argon. The residual tritium could be removed by exposing the graphite tile to oxygen with water vapor or hydrogen at the high temperature above 1000 °C. The tritium retention of the dome top tile was quantified as 84-30 kBq/cm 2. The inner dome wing tile had a steep tritium distribution from 8 to 0.1 kBq/cm 2. It is observed that a measurable amount of tritium existed in the deep site of the graphite tile.

  6. Effect of resistivity profile on current decay time of initial phase of current quench in neon-gas-puff inducing disruptions of JT-60U

    NASA Astrophysics Data System (ADS)

    Kawakami, S.; Shibata, Y.; Watanabe, K. Y.; Ohno, N.; Isayama, A.; Takizuka, T.; Kawano, Y.; Okamoto, M.

    2013-11-01

    According to an early work [Y. Shibata et al., Nucl. Fusion 50, 025015 (2010)] on the behavior of the plasma current decay in the JT-60U disruptive discharges caused by the radiative collapse with a massive neon-gas-puff, the increase of the internal inductance mainly determined the current decay time of plasma current during the initial phase of current quench. To investigate what determines the increase of the internal inductance, we focus attention on the relationship between the electron temperature (or the resistivity) profile and the time evolution of the current density profile and carry out numerical calculations. As a result, we find the reason of the increase of the internal inductance: The current density profile at the start of the current quench is broader than an expected current density profile in the steady state, which is determined by the temperature (or resistivity) profile. The current density profile evolves into peaked one and the internal inductance is increasing.

  7. Molecular cloning, expression and properties of an alpha/beta-Galactoside alpha2,3-sialyltransferase from Vibrio sp. JT-FAJ-16.

    PubMed

    Takakura, Yoshimitsu; Tsukamoto, Hiroshi; Yamamoto, Takeshi

    2007-09-01

    We cloned, expressed and characterized a novel alpha/beta-galactoside alpha2,3-sialyltransferase from Vibrio sp. bacterium JT-FAJ-16. Using a alpha2,3-sialyltransferase gene from a marine bacterium as a probe, a DNA sequence encoding a 402-amino-acid protein was identified from the JT-FAJ-16 genomic library. The protein showed 27.3-64.7% identity to the bacterial sialyltransferases classified into glycosyltransferase family 80. The protein showed sialyltransferase activity when expressed in Escherichia coli. The N-terminal truncated form of the enzyme was amplified in E. coli and its recovered activity was 215.7 unit/l culture medium. It was purified as a single band on SDS-PAGE through the three chromatographic steps. The specific activity of the purified recombinant enzyme reached 57.5 unit/mg protein. The alpha2,3sialylation was confirmed by (1)H- and (13)C-NMR analyses of the reaction products. The enzyme was optimally active at pH 5.5 and at 20 degrees C. Interestingly, the enzyme used both the alpha- and beta-anomers of galactosides as acceptors, suggesting that it can be described as an alpha/beta-galactoside alpha2,3-sialyltransferase. The enzyme had a wide range of acceptor substrate specificities. It transferred N-acetylneuraminic acid (NeuAc) to various monosaccharides and various oligosaccharides, and both N-linked and O-linked asialo-glycoprotein. These results suggest that the enzyme can be used as a powerful tool for the study for glycotechnology. PMID:17673486

  8. Off-axis fishbone-like instability and excitation of resistive wall modes in JT-60U and DIII-D

    SciTech Connect

    Okabayashi, M.; Solomon, W. M.; Budny, R. V.; Manickam, J. [Princeton Plasma Physics Laboratory, PO Box 451, Princeton, New Jersey 08543-0451 (United States); Matsunaga, G.; Takechi, M.; Asakura, N.; Shinohara, K. [Japan Atomic Energy Agency, 801-1, Mukouyama, Naka, Ibaraki 311-0193 (Japan); Grassie, J. S. de; Strait, E. J.; Jackson, G. L.; La Haye, R. J. [General Atomics, PO Box 85608, San Diego, California 92186-5608 (United States); Heidbrink, W. W.; Zhu, Y. B. [Department of Physics and Astronomy, University of California-Irvine, Irvine, California 92697 (United States); In, Y. [FAR-TECH, Inc., 3550 General Atomics Ct, San Diego, California 92121 (United States); Liu, Y. Q. [Euratom/CCFE Fusion Association, Culham Science Centre, Abingdon, OX14 3DB (United Kingdom); Reimerdes, H.; Hanson, J. M.; Lanctot, M. J. [Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027-6900 (United States)

    2011-05-15

    An energetic-particle (EP)-driven ''off-axis-fishbone-like mode (OFM)'' often triggers a resistive wall mode (RWM) in JT-60U and DIII-D devices, preventing long-duration high-{beta}{sub N} discharges. In these experiments, the EPs are energetic ions (70-85 keV) injected by neutral beams to produce high-pressure plasmas. EP-driven bursting events reduce the EP density and the plasma rotation simultaneously. These changes are significant in high-{beta}{sub N} low-rotation plasmas, where the RWM stability is predicted to be strongly influenced by the EP precession drift resonance and by the plasma rotation near the q=2 surface (kinetic effects). Analysis of these effects on stability with a self-consistent perturbation to the mode structure using the MARS-K code showed that the impact of EP losses and rotation drop is sufficient to destabilize the RWM in low-rotation plasmas, when the plasma rotation normalized by Alfven frequency is only a few tenths of a percent near the q=2 surface. The OFM characteristics are very similar in JT-60U and DIII-D, including nonlinear mode evolution. The modes grow initially like a classical fishbone, and then the mode structure becomes strongly distorted. The dynamic response of the OFM to an applied n=1 external field indicates that the mode retains its external kink character. These comparative studies suggest that an energetic particle-driven 'off-axis-fishbone-like mode' is a new EP-driven branch of the external kink mode in wall-stabilized plasmas, analogous to the relationship of the classical fishbone branch to the internal kink mode.

  9. Off-axis fishbone-like instability and excitation of resistive wall modes in JT-60U and DIII-Da)

    NASA Astrophysics Data System (ADS)

    Okabayashi, M.; Matsunaga, G.; deGrassie, J. S.; Heidbrink, W. W.; In, Y.; Liu, Y. Q.; Reimerdes, H.; Solomon, W. M.; Strait, E. J.; Takechi, M.; Asakura, N.; Budny, R. V.; Jackson, G. L.; Hanson, J. M.; La Haye, R. J.; Lanctot, M. J.; Manickam, J.; Shinohara, K.; Zhu, Y. B.

    2011-05-01

    An energetic-particle (EP)-driven "off-axis-fishbone-like mode (OFM)" often triggers a resistive wall mode (RWM) in JT-60U and DIII-D devices, preventing long-duration high-?N discharges. In these experiments, the EPs are energetic ions (70-85 keV) injected by neutral beams to produce high-pressure plasmas. EP-driven bursting events reduce the EP density and the plasma rotation simultaneously. These changes are significant in high-?N low-rotation plasmas, where the RWM stability is predicted to be strongly influenced by the EP precession drift resonance and by the plasma rotation near the q =2 surface (kinetic effects). Analysis of these effects on stability with a self-consistent perturbation to the mode structure using the MARS-K code showed that the impact of EP losses and rotation drop is sufficient to destabilize the RWM in low-rotation plasmas, when the plasma rotation normalized by Alfvén frequency is only a few tenths of a percent near the q =2 surface. The OFM characteristics are very similar in JT-60U and DIII-D, including nonlinear mode evolution. The modes grow initially like a classical fishbone, and then the mode structure becomes strongly distorted. The dynamic response of the OFM to an applied n =1 external field indicates that the mode retains its external kink character. These comparative studies suggest that an energetic particle-driven "off-axis-fishbone-like mode" is a new EP-driven branch of the external kink mode in wall-stabilized plasmas, analogous to the relationship of the classical fishbone branch to the internal kink mode.

  10. DC-9/JT8D refan, Phase 1. [technical and economic feasibility of retrofitting DC-9 aircraft with refan engine to achieve desired acoustic levels

    NASA Technical Reports Server (NTRS)

    1973-01-01

    Analyses and design studies were conducted on the technical and economic feasibility of installing the JT8D-109 refan engine on the DC-9 aircraft. Design criteria included minimum change to the airframe to achieve desired acoustic levels. Several acoustic configurations were studied with two selected for detailed investigations. The minimum selected acoustic treatment configuration results in an estimated aircraft weight increase of 608 kg (1,342 lb) and the maximum selected acoustic treatment configuration results in an estimated aircraft weight increase of 809 kg (1,784 lb). The range loss for the minimum and maximum selected acoustic treatment configurations based on long range cruise at 10 668 m (35,000 ft) altitude with a typical payload of 6 804 kg (15,000 lb) amounts to 54 km (86 n. mi.) respectively. Estimated reduction in EPNL's for minimum selected treatment show 8 EPNdB at approach, 12 EPNdB for takeoff with power cutback, 15 EPNdB for takeoff without power cutback and 12 EPNdB for sideline using FAR Part 36. Little difference was estimated in EPNL between minimum and maximum treatments due to reduced performance of maximum treatment. No major technical problems were encountered in the study. The refan concept for the DC-9 appears technically feasible and economically viable at approximately $1,000,000 per airplane. An additional study of the installation of JT3D-9 refan engine on the DC-8-50/61 and DC-8-62/63 aircraft is included. Three levels of acoustic treatment were suggested for DC-8-50/61 and two levels for DC-8-62/63. Results indicate the DC-8 technically can be retrofitted with refan engines for approximately $2,500,000 per airplane.

  11. Gyrotron development for high-power, long-pulse electron cyclotron heating and current drive at two frequencies in JT-60SA and its extension toward operation at three frequencies

    NASA Astrophysics Data System (ADS)

    Kobayashi, T.; Yokokura, S. Moriyama K.; Sawahata, M.; Terakado, M.; Hiranai, S.; Wada, K.; Sato, Y.; Hinata, J.; Hoshino, K.; Isamaya, A.; Oda, Y.; Ikeda, R.; Takahashi, K.; Sakamoto, K.

    2015-06-01

    A gyrotron enabling high-power, long-pulse oscillations at both 110 and 138 GHz has been developed for electron cyclotron heating (ECH) and current drive (CD) in JT-60SA. Oscillations of 1 MW for 100 s have been demonstrated at both frequencies, for the first time in the world as a gyrotron operating at two frequencies. The optimization of the anode voltage, or the electron pitch factor, using a triode gun was a key to obtain high power and high efficiency at two frequencies. It was also confirmed that the internal losses in the gyrotron were sufficiently low for expected long pulse operation at the higher power level of ?1.5 MW. Another important result is that an oscillation at 82 GHz, which enables use of fundamental harmonic waves in JT-60SA while the other two frequencies are used as second harmonics waves, was demonstrated up to 0.4 MW for 2 s. These results of the gyrotron development significantly contribute to enhancing the operation regime of the ECH/CD system in JT-60SA.

  12. Hybrid simulation of fast ion dynamics in the presence of off-axis fishbone-like modes in high-beta JT-60U plasmas

    NASA Astrophysics Data System (ADS)

    Bierwage, Andreas; Aiba, Nobuyuki; Matsunaga, Go; Shinohara, Koji; Todo, Yasushi; Yagi, Masatoshi

    2013-10-01

    The MHD-PIC hybrid code MEGA is used to simulate high-beta JT-60U plasmas in regimes near marginal MHD ballooning stability and driven by neutral beams. The goal of this research is to study the transport of fast ions caused by experimentally observed fishbone-like modes that peak off-axis (near the q = 2 surface) and have frequencies well below the accumulation points of the beta-induced gap of the shear Alfvén continuum. The approach chosen is as follows. Before examining the physics via parameter scans and case studies, the relevance of the simulation model is verified by checking whether the code can reproduce a plasma response with properties similar to those seen in the experiments. For this purpose, the simulation scenario is set up as realistically as currently possible: with realistic plasma shape and bulk pressure, and a fast ion distribution that is consistent with particle sources and collisions. The methods used and first results are reported and discussed. The MHD-PIC hybrid code MEGA is used to simulate high-beta JT-60U plasmas in regimes near marginal MHD ballooning stability and driven by neutral beams. The goal of this research is to study the transport of fast ions caused by experimentally observed fishbone-like modes that peak off-axis (near the q = 2 surface) and have frequencies well below the accumulation points of the beta-induced gap of the shear Alfvén continuum. The approach chosen is as follows. Before examining the physics via parameter scans and case studies, the relevance of the simulation model is verified by checking whether the code can reproduce a plasma response with properties similar to those seen in the experiments. For this purpose, the simulation scenario is set up as realistically as currently possible: with realistic plasma shape and bulk pressure, and a fast ion distribution that is consistent with particle sources and collisions. The methods used and first results are reported and discussed. This work is partly supported by Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (JSPS).

  13. Development of a high-brightness and low-divergence lithium neutral beam for a Zeeman polarimetry on JT-60U.

    PubMed

    Kojima, Atshushi; Kamiya, Kensaku; Iguchi, Harukazu; Fujita, Takaaki; Kakiuchi, Hideto; Kamada, Yutaka

    2008-09-01

    A high-brightness and low-divergence neutral beam is obtained for a Zeeman polarimetry of edge plasmas on JT-60U. The electron density and the pitch angle of the magnetic field line, thus the plasma current density distribution, can be measured by the Zeeman polarimetry using the lithium beam. A thermionic ion source heated by an electron beam is developed in order to obtain the ion beam current extraction over 10 mA. The beam optics is designed after detailed numerical simulation taking the space charge effects into account because a low-divergence angle of the neutral lithium beam leads to a narrow spectrum of the beam emission. It is also necessary to keep the beam radius small for good spatial resolution due to a long beam line of 6.5 m. The newly developed ion gun is operated on a test stand which simulates the diagnostic arrangement on JT-60U. The ion beam current of 10 mA at a beam energy of 10 keV is successfully extracted from the ion source operated at the temperature over 1300 degrees C and focused by Einzel lens. The full width at half maximum radius of the ion beam at the neutralizer is about 9 mm. A sodium vapor neutralizer neutralizes the collimated ion beam fully at the temperature of 300 degrees C. The neutral beam profiles are measured at two locations of the beam line at Z=2.3 m (beam monitor position) and Z=6.5 m (plasma region). The half-width at half maximum radius of the neutral beam of 26 mm and the equivalent beam current of 3 mA with the beam divergence angle of 0.2 deg which is the half-angle divergence are obtained. Those parameters satisfy the requirements of the Zeeman polarimetry. Furthermore, a long pulse extraction with a current of 10 mA and duration of 50 s is attained. PMID:19044408

  14. High heat flux experiment on B 4C-overlaid C/C composites for plasma facing materials of JT-60U

    NASA Astrophysics Data System (ADS)

    Nakamura, K.; Akiba, M.; Suzuki, S.; Yokoyama, K.; Dairaku, M.; Ando, T.; Jimbou, R.; Saidoh, M.; Fukaya, K.; Bolt, H.; Linke, J.

    1992-12-01

    High heat flux experiments (5-40 MW/m 2, 5 s and 550 MW/m 2, 5-10 ms) in the JAERI electron beam irradiation stand (JEBIS) have been carried out on three kinds (conversion, CVD and LLPS) of B 4C-overlaid C/C composites, on which B 4C is overlaid with a thickness of 100-250 ?m. Measurements were made with respect to the weight loss, changes of the surface morphology and of the surface atomic composition, and the surface temperature. As a result of these experiments, it is found that B 4C layers of all samples have no damages except small weight losses up to 12 MW/m 2 heat loads, which are estimated at the divertor tiles of JT-60U in normal plasma operation, and that the conversion method is the best of the three methods applied in the present tests, since no exfoliation has occurred even under the disruption conditions.

  15. Fast plasma shutdown by killer pellet injection in JT-60U with reduced heat flux on the divertor plate and avoiding runaway electron generation

    NASA Astrophysics Data System (ADS)

    Yoshino, R.; Kondoh, T.; Neyatani, Y.; Itami, K.; Kawano, Y.; Isei, N.

    1997-02-01

    A killer pellet is an impurity pellet that is injected into a tokamak plasma in order to terminate a discharge without causing serious damage to the tokamak machine. In JT-60U neon ice pellets have been injected into OH and NB heated plasmas and fast plasma shutdowns have been demonstrated without large vertical displacement. The heat pulse on the divertor plate has been greatly reduced by killer pellet injection (KPI), but a low-power heat flux tail with a long time duration is observed. The total energy on the divertor plate increases with longer heat flux tail, so it has been reduced by shortening the tail. Runaway electron (RE) generation has been observed just after KPI and/or in the later phase of the plasma current quench. However, RE generation has been avoided when large magnetic perturbations are excited. These experimental results clearly show that KPI is a credible fast shutdown method avoiding large vertical displacement, reducing heat flux on the divertor plate, and avoiding (or minimizing) RE generation.

  16. Johnson, K.E., Brady, J.B., MacFarlane, W.A., Thomas, R.B., Poulsen, C.J., and Sincock, M.J., 2004, Precambrian meta-ultramafic rocks from the Tobacco Root Mountains, Montana, in Brady, J.B., Burger, H.R., Cheney, J.T., and Harms, T.A., eds., Precambrian

    E-print Network

    Brady, John B.

    .J., 2004, Precambrian meta-ultramafic rocks from the Tobacco Root Mountains, Montana, in Brady, J.B., Burger, H.R., Cheney, J.T., and Harms, T.A., eds., Precambrian geology of the Tobacco Root Mountains of America Special Paper 377 2004 Precambrian meta-ultramafic rocks from the Tobacco Root Mountains, Montana

  17. The results of a low speed wind tunnel test to investigate the effects of installing refan JT8D engines on the McDonnell Douglas DC-9-30

    NASA Technical Reports Server (NTRS)

    Chrisenberry, H. E.; Doss, P. G.; Kressly, A. E.; Prichard, R. D.; Thorndike, C. S.

    1973-01-01

    A low speed wind tunnel test was conducted to assess the effects of the larger JT8D refan nacelles on the stability and control characteristics of the DC-9-30, with emphasis on the deep stall regime. Deep stall pitching moment and elevator hinge moment data, and low angle of attack tail-on and tail-off pitching moment data are presented. The refan nacelle was tested in conjunction with various pylons of reduced span relative to the production DC-9-30 pylon. Also, a horizontal tail that was larger than the production tail was tested. The data show that the refan installation has a small detrimental effect on the DC-9-30 deep stall recovery capability, that recovery characteristics are essentially independent of pylon span, and that the larger horizontal tail significantly increases recovery margins. The deep stall characteristics with the refan installation, within the range of pylon spans tested, are acceptable with no additional design changes anticipated.

  18. JT90 thermal barrier coated vanes

    NASA Technical Reports Server (NTRS)

    Sheffler, K. D.; Graziani, R. A.; Sinko, G. C.

    1982-01-01

    The technology of plasma sprayed thermal barrier coatings applied to turbine vane platforms in modern high temperature commercial engines was advanced to the point of demonstrated feasibility for application to commercial aircraft engines. The three thermal barrier coatings refined under this program are zirconia stabilized with twenty-one percent magnesia (21% MSZ), six percent yttria (6% YSZ), and twenty percent yttria (20% YSZ). Improvement in thermal cyclic endurance by a factor of 40 times was demonstrated in rig tests. A cooling system evolved during the program which featured air impingement cooling for the vane platforms rather than film cooling. The impingement cooling system, in combination with the thermal barrier coatings, reduced platform cooling air requirements by 44% relative to the current film cooling system. Improved durability and reduced cooling air requirements were demonstrated in rig and engine endurance tests. Two engine tests were conducted, one of 1000 cycles and the other of 1500 cycles. All three coatings applied to vanes fabricated with the final cooling system configuration completed the final 1500 cycle engine endurance test. Results of this test clearly demonstrated the durability of the 6% YSZ coating which was in very good condition after the test. The 21% MSZ and 20% YSZ coatings had numerous occurrences of significant spalling in the test.

  19. JT/LJT connector insert material evaluation

    SciTech Connect

    Baca, J.R.F.

    1991-10-01

    Different insert (insulator) materials are undergoing evaluation to replace the Fiberite E-3938 BE96 material currently used. Also being evaluated is the reconfiguration of the insert and metal shell-edge geometries for the purpose of reducing the alleged interference principally responsible for insert damage.

  20. J.T. Roberts' Science Fair

    NSDL National Science Digital Library

    Ms. Greeley

    2007-11-03

    The following websites will be useful when preparing your science fair project. It is that time of year again! It is time to start planning your science fair project. All 7th and 8th grade students are required to participate in in the science fair. This is an opportunity to explore the exciting world in which we live. REQUIREMENTS: - Students will work ...

  1. First operation of multijunction launcher on JT-60

    Microsoft Academic Search

    Y. Ikeda; T. Imai; K. Ushigusa; M. Seki; K. Konishi; O. Naito; M. Honda; K. Kiyono; S. Maebara; T. Nagashima; M. Sawahata; K. Suganuma; K. Uehara; K. Yokokura

    1989-01-01

    The multijunction launcher was designed to improve the directivity of the launched waves with a narrow wavenumber spectrum by dividing the main waveguide into three of secondary waveguides. The coupling agrees fairly well with the theory and the power of more than 2.75 MW has been coupled to a plasma in a few week conditioning. The dependence of the current

  2. 1999 J.T. Raviz. All rights reserved. CHAPTER ONE

    E-print Network

    Standiford, Richard B.

    or a hundred good miles traveling around it. As it lay there with the shadows of the mountains brilliantly eighty feet deep. Every pebble was distinct, every speckled trout, every hand's-breadth of sand . . . The water was not merely transparent, but dazzlingly, brilliantly so." Twain's romance with Lake Tahoe took

  3. J. theor. Biol. (1998) 195, 8795 Article No. jt980782

    E-print Network

    Brunel, Nicolas

    1998-01-01

    Academic Press Firing Frequency of Leaky Integrate-and-fire Neurons with Synaptic Current Dynamics NICOLAS with synaptic current dynamics, in which the synaptic time constant t' is much smaller than the membrane time constant t. We calculate analytically the firing frequency of such a neuron for inputs described

  4. 1999 J.T. Raviz. All rights reserved. CHAPTER FOUR

    E-print Network

    Standiford, Richard B.

    , and algal growth has been increasing at a rate greater than five percent per year. Correspondingly, there has been a decline of clarity at an alarming rate of nearly one foot per year. This long-term trend problems that must be addressed to meet desired conditions for lake clarity and algal growth, other

  5. Current Perspectives on Imaging Language J.T. Devlin

    E-print Network

    essentially could not produce speech. Despite considerable, widespread damage to this patient's brain, Broca's area and then to motor word forms in Broca's area. Although the cognitive model includes a centre that many patients with speech pro- duction deficits did not have damage to Broca's area, while in some

  6. Clean-up of graphite first walls in JT-60

    NASA Astrophysics Data System (ADS)

    Arai, T.; Takatsu, H.; Ninomiya, H.; Yoshino, R.; Hosogane, N.; Yamamoto, M.; Kodama, K.; Kaminaga, A.; Shimizu, M.; JT-60 Team

    1989-04-01

    During the venting period from April to May 1987 about a half of TiC-coated molybdenum and Inconel 625 first walls were removed and graphite first walls were installed. The overall surface area and the weight of the graphite tiles are 200 m 2 and 3500 kg, respectively. Two kinds of isotropic graphite (Ibiden ETP-10 and Hitachi-Chemical HCB-18S) were used. Special attention was paid to the contamination of the graphite first walls during the courses of fabrication and installation. Main discharge were tried after 7 d conditioning, which included 3 d bakeout at the temperature of 300°C, 18 h glow discharge cleaning and 36 h Taylor-type discharge cleaning keeping the vessel temperature around 280°C. A 0.5 MA stable plasma was successfully attained at the 6th shot and a very rapid start-up of the discharge conditioning with plasma current up to 1 MA was achieved with 14 shots. An ultimate pressure of 6.4 × 10 -7 Pa was obtained with the vessel temperature at RT and the residual gases were water, carbon oxide and carbon hydride.

  7. Predicting Mothers’ Reports of Children’s Mental Health Three Years after Hurricane Katrin

    PubMed Central

    Lowe, Sarah R.; Godoy, Leandra; Rhodes, Jean E.; Carter, Alice S.

    2012-01-01

    This study explored pathways through which hurricane-related stressors affected the psychological functioning of elementary school aged children who survived Hurricane Katrina. Participants included 184 mothers from the New Orleans area who completed assessments one year pre-disaster (Time 1), and one and three years post-disaster (Time 2 and Time 3, respectively). Mothers rated their children’s behavior problems at Time 3 only (n = 251 children; 53.0% male; Mean age: 10.19 years, SD = 1.68 years). A path analytic model indicated that hurricane-related stressors were associated with increased maternal psychological distress and school mobility in the first post-disaster year, which were associated with higher child internalizing and externalizing symptoms three years post-disaster. Mediation analysis indicated that hurricane-related stressors were associated with child symptoms indirectly, through their impact on maternal psychological distress. Findings underscore the importance of interventions that boost maternal and child mental health and support children through post-disaster school transitions. PMID:23471125

  8. SHALMANESER A Toolchain For Shallow Semantic Parsing Katrin Erk and Sebastian Pad

    E-print Network

    Padó, Sebastian

    problems of deep semantic analysis such as modality, negation, or scope ambiguity. These properties have" to obtain semantic parses for new datasets (classifiers for English and German frame-semantic analysis paradigms. 1. Introduction The last decade has seen immense successes in syntactic analysis, in which

  9. Probing the Tetrahymena Group I Ribozyme Reaction in Both Directions Katrin Karbstein, Kate S. Carroll, and Daniel Herschlag*

    E-print Network

    Herschlag, Dan

    of self-splicing: CCCUCUA (S) + [UC]G h CCCUCU (P) + [UC]GA. To relate our understanding of the ribozyme of the substrates. Further, binding of UCGA is 12-fold weaker than binding of the unphosphorylated UCG, analogous the stronger binding of UCG were traced to the 3-hydroxyl group of UCG. The symmetrical effects on binding

  10. Development of a low-noise 10 K J-T refrigeration system. Technical progress report

    SciTech Connect

    Paugh, R.L.

    1989-09-15

    The purpose of this contract extension is the continuation of the development of a compact, microminiature, low-noise, closed-cycle, Joule-Thomson refrigeration system for 10K operation for use in infrared sensing, low noise microwave signal detection and high speed superconducting electronic data processing. Work is continuing in the following areas: (a) Ongoing refrigerator design and development; (b) Compressor assembly and test, (c) Implementation of gas cleansing techniques, and (d) System integration.

  11. Development of a low-noise 10K J-T refrigeration system. Technical progress report

    SciTech Connect

    Little, W.A.; Edman, H.; Stewart, M.; DuBois, M.; Nasg, A.

    1986-08-15

    This report summarizes the work done to date, in the first 30 days on the development of a low-noise, Joule-Thomson, microminiature refrigeration system designed for 10K operation. The plan of attack for the present contract has three major parts to it: first, the development of the three-stage refrigerator; second, the development of a suitable compressor to provide the gases, and thirdly, the development of an effective gas-cleansing system.

  12. Efficient lower hybrid current drive using a multijunction launcher on JT-60

    Microsoft Academic Search

    Y. Ikeda; T. Imai; K. Ushigusa; M. Seki; K. Konishi; O. Naito; M. Honda; K. Kiyono; S. Maebara; T. Nagashima; M. Sawahata; K. Suganuma; N. Suzuki; K. Uehara; K. Yokokura

    1989-01-01

    A multijunction launcher was designed and constructed to improve the directivity of launched waves with a narrow wave number spectrum by dividing each main waveguide into three secondary waveguides. The coupling characteristics agree fairly well with theory, and a power of up to 2 MW was obtained after a few days of conditioning. The dependence of the current drive efficiency

  13. LOCALIZED MHD ACTIVITY NEAR TRANSPORT BARRIERS IN JT-60U AND TFTR

    E-print Network

    of unity. The bursts are often seen to coincide with qmin having an integer value, in this case qmin 4 evolution of the a plasma current, Ip, neutral beam injection power PNB, b stored energy, Wdia, and qmin

  14. Development of a low noise 10 K J-T refrigeration system

    NASA Astrophysics Data System (ADS)

    Little, William A.

    1987-02-01

    This report summarizes work on the development of a low noise Joule-Thomson, microminiature refrigeration system, designed for 10 K operation. Two events have occurred since the last report which have had an important influence on the confirmation through a series of experimental measurements of the remarkable cooling power at 80 K to 90 K of the nitrogen-hydrocarbon gas mixtures discussed briefly in the previous report. These experiments confirmed that these mixtures could give a refrigeration an order of magnitude greater than that attainable with argon or nitrogen at the same input pressures. In addition, it was recognized that this high efficiency allowed one to use a heat exchanger of substantially smaller surface area and a compressor designed for operation at much lower pressures. This lower pressure operation would greatly reduce the wear of the piston seals and thereby prolong the life of the system. It was also discovered in the course of these measurements that the use of the gas mixtures resulted in virtually clog-free operation of the refrigerators.

  15. DC-9 flight demonstration program with refanned JT8D engines. Volume 2: Design and construction

    NASA Technical Reports Server (NTRS)

    1975-01-01

    The nacelle configuration selected for the DC-9 had a 1595.6 mm Refan length inlet and an 1811.8 mm exhaust duct. The inlet had 1234.4 mm of acoustic treatment and the tailpipe had 1305.5 mm of equivalent length acoustic treatment. The pylon was reduced in width from 425.5 mm to 204.5 mm. Fuselage frames and titanium skin panels in the area of the pylon were reinforced or replaced to support the higher loads and engine thrust. Experimental type tooling, fabrication and assembly were used on all hardware. The design is considered certifiable and representative of the hardware that would be built as retrofit kits.

  16. DEVELOPMENT OF A LOW HEAT LEAK CFRP STAND FOR MIRI COOLER JT HEAT EXCHANGER STAGE

    SciTech Connect

    Makowski, K. P.; Hayashil, B. [Alliance Spacesystems, LLC, Pasadena, CA 91103 (United States); Larson, M. E.; Loc, A. S.; Zhang, B. X.; Leland, R. S. [Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 (United States)

    2010-04-09

    A low heat leak stand is being developed for the Heat exchanger Stage Assembly (HSA) of the cryocooler subsystem for the Mid Infra-Red Instrument (MIRI) of the James Webb Space Telescope (JWST). The HSA stand is a hexapod structure supporting the 18 K HSA in a nominal 40 K background environment. Carbon fiber reinforced plastic (CFRP) has been selected for this application to meet the stringent design requirements of a low parasitic heat leak (less than 3.8 mW including both conductive and radiative heat loads for the thermal environment defined above) and a resonance frequency above 120 Hz. A directional lay-up of T300/polycyanate has been chosen for the construction of the hexapod struts. End fittings made of Invar 36 are bonded to the struts to provide structural interfaces. The development effort includes fabricating and testing (including cryogenic thermal cycling) six types of coupons for material characterization, determination of structural degradation due to thermal cycling, and selection of the joint bonding epoxy. Consequently, strut samples are used for final material characterization, performance assessment, and bond joint design evaluation. This paper describes the development process and addresses the challenges in meeting the design requirements. Results of finite element analysis (FEA) for the composite structure and experimental data collected through structural and thermal testing are also presented.

  17. Microseismic mapping of a Cotton Valley hydraulic fracture using decimated downhole arrays J.T. Rutledge

    E-print Network

    examined, and, of these, arrivals on multiple stations could be identified and reliably picked on 380 interval using data from 9 or fewer geophone stations. Gross fracture dimensions obtained from the 9-station data were the same as determined from the full-array data. Seismic velocities and station

  18. Development of a low noise 10 K J-T refrigeration system

    NASA Astrophysics Data System (ADS)

    Paugh, Robert L.

    1989-09-01

    The purpose of this contract extension is the continuation of the development of a compact, microminiature, low noise, closed cycle, Joule-Thomson refrigeration system for 10 K operation for use in infra-red sensing, low noise microwave signal detection and high speed superconducting electronic data processing. Work is continuing in the following areas: ongoing refrigerator design and development; compressor assembly and test, implementation of gas cleansing techniques, and system integration.

  19. Preliminary evaluation of hermetic JT/LJT/R P connector socket contact design

    SciTech Connect

    Baca, J.R.F.

    1991-10-01

    This report presents a precursory examination of a number of issues pertaining to socket contacts in hermetic connectors. The principal issues addressed are high-contact resistance and contact chatter (circuit discontinuities). Efforts examining the characteristics of the existing socket contact design, the possibility of connector/contact rework, quick-fix solutions, and contact redesigns are summarized.

  20. M.Evernden and J.T. Mottram School of Engineering, University of Warwick

    E-print Network

    Mottram, Toby

    does it fit into the market? Med. sized closed sections with EIxx > 8.4x1012Nmm2 Lower cost than) 5.7×1012 Nmm2 Increase in flexural rigidity of 520% #12;Partial Interaction - Newmark Analysis and resulting loss of bending stiffness is taken into account ·Bending moment due to sectional forces acting

  1. JT9D-7A /SP/ jet engine performance deterioration trends

    NASA Technical Reports Server (NTRS)

    Richter, G. P.; Olsson, W. J.; Andersen, N. B.

    1980-01-01

    It is noted that increasing fuel costs and the decreasing availability of fuel supplies have lead to an increase in the importance of maintaining good specific fuel consumption over the life cycle of jet engines. Attention is given to an engine diagnostics program sponsored by NASA Lewis Research Center which has the objectives of identifying and quantifying the levels, trends, and causes of engine performance deterioration. It is reported that as part of the program, a series of installed engine calibrations were performed on two new Pan American World Airways 747 SP aircraft. A discussion of this specific test program and the results of the analysis of the data are presented.

  2. Performance characterization of a 6-K multiple JT helium adsorption cryocooler

    NASA Technical Reports Server (NTRS)

    Elliot, S.; Johnson, D. L.; Lindersmith, C. A.; Sirbi, A.

    2002-01-01

    We present the work done at the Jet Propulsion Laboratory for a Helium Adsorption Cooler to produce continuous cooling power at a temperature around 6 K. The goal of this development is to be able to propose for future space mission a long lifetime, vibration free cooler, which can cover the temperature range 18 K to 5 K.

  3. Seasonal Factors Affecting the Control of Annual Bluegrass ( Poa annua L.) with Xanthomonas campestris pv. poae (JT-P482)

    Microsoft Academic Search

    S Imaizumi; A Tateno; D Miyamoto; K Morita; T Fujimori

    1999-01-01

    To ascertain the optimum timing for the application of Xanthomonas campestris pv. poae to control annual bluegrass (Poa annua), the differences in the efficacy of treatments initiated in consecutive months were investigated. October treatment and February through April treatments produced acceptable levels of fresh weight (FW) loss in annual bluegrass the following spring in pot experiments set in the field.

  4. Development of a low-noise 10 K J-T (Joule-Thomson) refrigeration system. Technical report (Final)

    Microsoft Academic Search

    1987-01-01

    This report summarizes work done on the development of a low-noise Joule-Thomson, microminiature refrigeration system designed for 10 K operation. Topics discussed include: calculation of phase diagram of mixtures of certain hydrocarbon gases with nitrogen using the Benedict-Webb-Rubin equation of state; the setup of a magnetron-enhanced sputtering system to allow sputtering a layer of adhesive on the glass substrates with

  5. 76 FR 77107 - Airworthiness Directives; Pratt & Whitney Corp. (PW) JT9D-7R4H1 Turbofan Engines

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-12-12

    ...of cracks in five high-pressure compressor (HPC) shafts. This AD requires removing certain HPC shafts before their certified life limits and...41144). That NPRM proposed to require: For HPC shafts that have more than 4,500...

  6. A General Theory of Lee-Yang Zeros in Models with First-Order Phase Transitions , J.T. Chayes

    E-print Network

    Chaudhuri, Surajit

    A General Theory of Lee-Yang Zeros in Models with First-Order Phase Transitions M. Biskup , C a general, rigorous theory of Lee-Yang zeros for models with first-order phase tran- sitions and derive: the Ising magnet, the Blume-Capel model, and the Potts model. PACS numbers: 05.50.+q, 05.70.Fh, 64.60.Cn, 75

  7. 75 FR 50945 - Airworthiness Directives; Pratt & Whitney JT8D-209, -217, -217A, -217C, and -219 Turbofan Engines

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-08-18

    ...inspection methods for 1st stage compressor hubs, 3rd stage turbine...listed parts with all the blades removed. [[Page 50947...Hub (Disk), 1st Stage Compressor: * Hub Detail--All P...04, -05 Disk, 13th Stage Compressor--All 72-36-47...

  8. Studies of heat and particle loadings in long pulse plasmas and influence on PWI in JT-60U

    E-print Network

    Princeton Plasma Physics Laboratory

    installed at 1 toroidal section of outer divertor. W-CFC tile: VPS coating on CFC: 50µm with Re multi and how Carbon migrates globally and locally Diffusion along pores Implantation (saturates) D+ D+ C with increasing temperature. Saturatedamount (1021D/m2) D implantation to C materials (W. Möller, J. Nucl. Mater

  9. Off-axis current drive and real-time control of current profile in JT-60U

    NASA Astrophysics Data System (ADS)

    Suzuki, T.; Ide, S.; Oikawa, T.; Fujita, T.; Ishikawa, M.; Seki, M.; Matsunaga, G.; Hatae, T.; Naito, O.; Hamamatsu, K.; Sueoka, M.; Hosoyama, H.; Nakazato, M.; JT-60 Team

    2008-04-01

    Aiming at optimization of current profile in high-? plasmas for higher confinement and stability, a real-time control system of the minimum of the safety factor (qmin) using the off-axis current drive has been developed. The off-axis current drive can raise the safety factor in the centre and help to avoid instability that limits the performance of the plasma. The system controls the injection power of lower-hybrid waves, and hence its off-axis driven current in order to control qmin. The real-time control of qmin is demonstrated in a high-? plasma, where qmin follows the temporally changing reference qmin,ref from 1.3 to 1.7. Applying the control to another high-? discharge (?N = 1.7, ?p = 1.5) with m/n = 2/1 neo-classical tearing mode (NTM), qmin was raised above 2 and the NTM was suppressed. The stored energy increased by 16% with the NTM suppressed, since the resonant rational surface was eliminated. For the future use for current profile control, current density profile for off-axis neutral beam current drive (NBCD) is for the first time measured, using the motional Stark effect diagnostic. Spatially localized NBCD profile was clearly observed at the normalized minor radius ? of about 0.6-0.8. The location was also confirmed by multi-chordal neutron emission profile measurement. The total amount of the measured beam driven current was consistent with the theoretical calculation using the ACCOME code. The CD location in the calculation was inward shifted than the measurement.

  10. The search for the neutrino mass by direct method in the tritium beta-decay and perspectives of study it in the project KATRIN

    Microsoft Academic Search

    V. M. Lobashev

    2003-01-01

    The updated results of the search for neutrino mass in the tritium beta-decay on the Troitsk nu-mass and Neutrino Mainz set-ups are presented. Both groups give an upper limit for the neutrino mass at 95% mv < 2.05 eV\\/c2 in Troitsk and mv < 2.2 V\\/c2 in Mainz. Further improvement is limited both by statistic and systematic errors. In order

  11. for 2014 FESAC Strategic Planning Panel Meeting, 8th July, 2014

    E-print Network

    for 2014 FESAC Strategic Planning Panel Meeting, 8th July, 2014 The JT-60SA Research Regimes for ITER and DEMO Y. Kamada (JAEA) and the JT-60SA Team #12;JT-60SA HP: http://www.jt60sa.org/b/index.htm JT-60SA Research Plan: http://www.jt60sa.org/b/index_nav_3.htm?n3/operation.htm References: S. Ishida

  12. Design of an L-Band Microwave Radiometer with Active Mitigation of Interference Steven W. Ellingson, G.A. Hampson, and J.T. Johnson

    E-print Network

    Ellingson, Steven W.

    Design of an L-Band Microwave Radiometer with Active Mitigation of Interference Steven W. Ellingson., Columbus, OH 43212 {ellingson.1, hampson.8, johnson.1374}@osu.edu Abstract-- For increased sensitivity in L-band of the radio frequency environment at L-band from an airborne system are also discussed. I. Introduction Radio

  13. Effects of toroidal rotation shear and magnetic shear on thermal and particle transport in plasmas with electron cyclotron heating on JT-60U

    NASA Astrophysics Data System (ADS)

    Yoshida, M.; Honda, M.; Narita, E.; Hayashi, N.; Urano, H.; Nakata, M.; Miyato, N.; Takenaga, H.; Ide, S.; Kamada, Y.

    2015-07-01

    Increases in thermal and particle transport with electron cyclotron heating (ECH) that are observed in many tokamaks can be a critical issue in establishing ITER operational scenarios with electron heating. To address the issues, conditions with no increase in the thermal and particle transport with ECH have been experimentally investigated in positive magnetic shear, weak magnetic shear (WS) and reversed magnetic shear plasmas with internal transport barrier in the ion channel. The ion heat diffusivity (?i) around the internal transport barrier in the ion temperature remains constant with ECH when a large negative toroidal rotation shear (|dV?/dr| > 4 × 105 s?1) is formed before the ECH. On the other hand, ?i increases on the condition that the toroidal rotation shear is small or positive. The characteristics do not depend on magnetic shear, the electron to ion temperature ratio (Te/Ti) and ECH power. The electron heat diffusivity stays constant with ECH when the magnetic shear is negative. Effective particle transport remains constant or reduces during ECH under the condition of negative magnetic shear. An observation indicates that there is no threshold of the negative magnetic shear or a very small one for the electron channel sustainment; the electron thermal and particle confinement is maintained during ECH with a small negative magnetic shear in the WS operation.

  14. ITS4: A Static Vulnerability Scanner for C and C++ Code John Viega, J.T. Bloch, Yoshi Kohno, Gary McGraw

    E-print Network

    Matsuoka, Yoky

    consecutively in memory. Reading continues until a newline or end of file character is reached, at which point for vulnerabilities. Com- pared to other approaches, our scanning technique stakes out a new middle ground between The C and C++ programming languages and supporting libraries make it extremely easy for programmers

  15. infection ofAsca.ropkis and COrlJt/.OSO'ffI.a and of the commensal Histriobdella reported from American

    E-print Network

    . Parasitol. 56(4). 200 YAMAGUTI, S. 1963. Classification of the Acanthocephala. Systema Helmin- thurn, Vol. V, Acanthocephala. Interscience Publ., 423 p. W. A. VAN ENGEL R. E. HARRIS, JR. D. E. ZWERNER Virginia InstUltie of

  16. Mitochondrial DNA (mtDNA) variants in the European haplogroups HV, JT, and U do not have a major role in schizophrenia.

    PubMed

    Torrell, Helena; Salas, Antonio; Abasolo, Nerea; Morén, Constanza; Garrabou, Glòria; Valero, Joaquín; Alonso, Yolanda; Vilella, Elisabet; Costas, Javier; Martorell, Lourdes

    2014-10-01

    It has been reported that certain genetic factors involved in schizophrenia could be located in the mitochondrial DNA (mtDNA). Therefore, we hypothesized that mtDNA mutations and/or variants would be present in schizophrenia patients and may be related to schizophrenia characteristics and mitochondrial function. This study was performed in three steps: (1) identification of pathogenic mutations and variants in 14 schizophrenia patients with an apparent maternal inheritance of the disease by sequencing the entire mtDNA; (2) case-control association study of 23 variants identified in step 1 (16 missense, 3 rRNA, and 4 tRNA variants) in 495 patients and 615 controls, and (3) analyses of the associated variants according to the clinical, psychopathological, and neuropsychological characteristics and according to the oxidative and enzymatic activities of the mitochondrial respiratory chain. We did not identify pathogenic mtDNA mutations in the 14 sequenced patients. Two known variants were nominally associated with schizophrenia and were further studied. The MT-RNR2 1811A?>?G variant likely does not play a major role in schizophrenia, as it was not associated with clinical, psychopathological, or neuropsychological variables, and the MT-ATP6 9110T?>?C p.Ile195Thr variant did not result in differences in the oxidative and enzymatic functions of the mitochondrial respiratory chain. The patients with apparent maternal inheritance of schizophrenia did not exhibit any mutations in their mtDNA. The variants nominally associated with schizophrenia in the present study were not related either to phenotypic characteristics or to mitochondrial function. We did not find evidence pointing to a role for mtDNA sequence variation in schizophrenia. PMID:25132006

  17. J. theor. Biol. (1998) 192, 445453 00225193/98/120445 + 09 $25.00/0/jt980665 7 1998 Academic Press

    E-print Network

    Gross, Mart

    1998-01-01

    of Zoology, University of Toronto, 25 Harbord Street, Toronto, Ontario, Canada M5S 3G5 and Department tactics (phenotypes). An example is fighters and sneakers in many animal mating systems), and the widespread occurrence of fighters (a) and sneakers (b) in animal mating systems (e.g. Gross, 1996). How

  18. High heat flux experiment on B4C-converted carbon based materials for plasma facing materials of JT-60U

    Microsoft Academic Search

    Kazuyuki Nakamura; Hiroshi Ishikawa; Toshiro Ando; Kazuyoshi Satoh; Kenji Yokoyama; Satoshi Suzuki; Masayuki Dairakum; Masanori Araki; Masato Akiba

    1994-01-01

    High heat flux experiments have been previously carried out on three kinds, namely low pressure plasma spray (LPPS), chemical vapor deposition (CVD) and conversion (CVR) methods, of B4C-overlaid CFC's using the JAERI electron beam irradiation system (JEBIS). As a result, it turned out that CVR method has the best adhesion property between B4C layer and bulk carbon. However, thicker B4C

  19. 75 FR 3217 - J&T Hydro Company; H. Dean Brooks and W. Bruce Cox; Notice of Application for Transfer of License...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-01-20

    ...11392 located on the Deep River in Randolph...the Commission's Web site under the ``e-Filing'' link. If unable to be...the Commission's Web site located at http...printed on the eLibrary link of the Commission's Web site at...

  20. J.-T. BOTTOMI,EY. -On experiments with vacuum gold-leaf electroscopes on the mechanical temperature effects in rarefied gases (Sur des expriences avec

    E-print Network

    Boyer, Edmond

    (Frottement interne des liquides visqueux et sa variation avec la pression). - P. 287-310. Stokes a calculé la seulement du frotte- ment interne. Si R désigne la résistance ; k, le coefficient de frottement interne du:019070060073401 #12;735 Si le frottement extérieur, c'est-à-dire de la sphère sur le liquide, est assez grand pour

  1. J. theor. Biol. (1998) 191, 415427 00225193/98/080415 + 13 $25.00/0/jt970615 7 1998 Academic Press Limited

    E-print Network

    Gavrilets, Sergey

    1998-01-01

    Press Limited Coevolutionary Chase in Two-species Systems with Applications to Mimicry SERGEY GAVRILETS to evolve. We analyse conditions for ``evolutionary chase'' between two phenotypically similar species, moths, beetles, bugs, flies and snails (Owen, 1980; Pough, 1988) and fungi (Roy, 1993). In Batesian

  2. J. theor. Biol. (1998) 190, 135146 00225193/98/020135 + 12 $25.00/0/jt970537 7 1998 Academic Press Limited

    E-print Network

    1998-01-01

    following a loss of blood typical of a blood donation. Numerical studies for a rabbit with an induced auto-immune regulation of this physiological system appears to underlie several hematological disorders that display

  3. Control of divertor heat load by Ar injection with keeping high performance in ELMy H-mode plasmas on JT-60U

    NASA Astrophysics Data System (ADS)

    Higashijima, S.; Asakura, N.; Kubo, H.; Miura, Y.; Nakano, T.; Konoshima, S.; Itami, K.; Sakurai, S.; Takenaga, H.; Tamai, H.; JT-60 Team

    2003-03-01

    In ELMy H-mode plasmas of Japan Atomic Energy Research Institute Tokamak-60 Upgrade, extension of a high confinement regime toward high density and high radiation-loss-power fraction has been investigated by Ar injection. With injecting Ar and putting the outer strike point on the top of divertor dome, confinement improvement, electron density, and radiation-loss-power fraction reached the ITER relevant regime; the thermal energy confinement time was as high as that the International Tokamak Experimental Reactor ELMy H-mode scaling IPB98( y,2), the electron density is ˜80% of the Greenwald density, and the radiation-loss-power fraction is ˜0.8. Although electron density profile is slightly peaked with Ar injection, the confinement improvement is mainly attributed to the improvement of ion transport. Moreover, the maximum divertor heat load due to ELMs has been reduced by a factor of 3-5 with keeping high confinement. ELM activity can be controlled by injecting Ar and changing the strike point position.

  4. Control of divertor heat load by Ar injection with keeping high performance in ELMy H-mode plasmas on JT-60U

    Microsoft Academic Search

    S. Higashijima; N. Asakura; H. Kubo; Y. Miura; T. Nakano; S. Konoshima; K. Itami; S. Sakurai; H. Takenaga; H. Tamai

    2003-01-01

    In ELMy H-mode plasmas of Japan Atomic Energy Research Institute Tokamak-60 Upgrade, extension of a high confinement regime toward high density and high radiation-loss-power fraction has been investigated by Ar injection. With injecting Ar and putting the outer strike point on the top of divertor dome, confinement improvement, electron density, and radiation-loss-power fraction reached the ITER relevant regime; the thermal

  5. Complex numbers Quaternions

    E-print Network

    Complex numbers Quaternions Imaginary numbers and Quaternions Katrin Leschke University of Leicester June 29, 2010 Katrin Leschke Imaginary numbers and Quaternions #12;Complex numbers Quaternions Imaginary numbers and Quaternions #12;Complex numbers Quaternions Vectors in 2d­space A vector in 2d

  6. Fabrication and Test of Ferromagnetic Single-Electron-Transistors

    E-print Network

    Haviland, David

    Fabrication and Test of Ferromagnetic Single-Electron-Transistors Diploma Thesis Katrin Pappert of Nanostructure Physics Diplomarbeit Fabrication and Test of Ferromagnetic Single-Electron-Transistors von Katrin in optimizing the process for the fabrication of ferromagnetic single electron transistors (FM

  7. Form 836 (7/06) Approved for public release;

    E-print Network

    Salisbury, Kenneth

    Halo and Center Finders for HACC Christopher Sewell Katrin Heitmann Li-ta Lo Salman Habib James Ahrens PORTABLE PARALLEL HALO AND CENTER FINDERS FOR HACC Christopher Sewell, LANL Katrin Heitmann, ANL Ollie Lo HACC is finding halos and the centers of those halos · HACC is designed as an MPI+X code

  8. CHAPTER 2 | NOAA OPERATIONS, RESEARCH, & FACILITIES BY LINE OFFICE Katrin Iken (left) and Bodil Bluhm move deep-sea mud from the trawl net to a bucket. The benthic scientists will sieve the mud to find

    E-print Network

    Bluhm move deep-sea mud from the trawl net to a bucket. The benthic scientists will sieve the mud to find creatures within it for additional research. Photo taken during the 2005 NOAA-sponsored "Hidden

  9. Dale M. Meade 2002 Fusion Summer Study

    E-print Network

    , MTF Three Large Tokamaks JT-60 U JET TFTR Several Large Facilities Burning D-T Adv. Long Pulse D Torus, RFP Spheromak, FRC, MTF Three Large Tokamaks JT-60 U JET TFTR Several Large Facilities FIRE KSTAR

  10. Alcaligenes faecalis subsp . phenolicus subsp. nov. a phenol-degrading, denitrifying bacterium isolated from a graywater bioprocessor

    Microsoft Academic Search

    Marc Rehfuss; James Urban

    2005-01-01

    A Gram (?) coccobacillary bacterium, JT, was isolated from a graywater bioprocessor. 16S rRNA and biochemical analysis has revealed strain JT closely resembles Alcaligenes faecalis ATCC 8750T and A. faecalis subsp. parafaecalis DSM 13975T, but is a distinct, previously uncharacterized isolate. Strain JT, along with the type strain of A. faecalis and its previously described subspecies share the ability to

  11. Association Euratom-CEA

    E-print Network

    Association Euratom-CEA JTJT--60SA60SA ITER Satellite Tokamak Program of JAITER Satellite Tokamak of JT60-SA · Engineering design of JT60-SA · Assembly and schedule · Summary #12;J. Bucalossi, CEA Association Euratom-CEA JT-60SA IFERC IFMIF-EVEDA ITER B.A. The "Broader Approach" #12;J. Bucalossi, CEA

  12. Interna'onal Collabora'on Opportuni'es for the

    E-print Network

    , and JT60SA to prepare for US parAcipaAon on ITER and to address the issues: Extension past 2014 & DT program ­ BA: IFMIF & JT-60SA ­ Requests not return #12;JET AUG EAST KSTAR JT-60SA MAST LHD W7-X RFX status mature mature emerging emerging

  13. Study of turbofan engines designed for low energy consumption

    NASA Technical Reports Server (NTRS)

    Gray, D. E.

    1976-01-01

    The near-term technology improvements which can reduce the fuel consumed in the JT9D, JT8D, and JT3D turbofans in commercial fleet operation through the 1980's are identified. Projected technology advances are identified and evaluated for new turbofans to be developed after 1985. Programs are recommended for developing the necessary technology.

  14. Validation of a model for radon-induced background processes in electrostatic spectrometers

    NASA Astrophysics Data System (ADS)

    Wandkowsky, N.; Drexlin, G.; Fränkle, F. M.; Glück, F.; Groh, S.; Mertens, S.

    2013-08-01

    The Karlsruhe Tritium Neutrino (KATRIN) experiment investigating tritium ?-decay close to the endpoint with unprecedented precision has stringent requirements on the background level of less than 10-2 counts per second. Electron emission during the ?-decay of 219, 220Rn atoms in the electrostatic spectrometers of KATRIN is a serious source of background exceeding this limit. In this paper we compare extensive simulations of Rn-induced background to specific measurements with the KATRIN pre-spectrometer to fully characterize the observed Rn-background rates and signatures and determine generic Rn emanation rates from the pre-spectrometer bulk material and its vacuum components.

  15. Proceedings of the 2007 Joint Conference on Empirical Methods in Natural Language Processing and Computational Natural Language Learning, pp. 400409, Prague, June 2007. c 2007 Association for Computational Linguistics

    E-print Network

    . of Linguistics University of Texas at Austin Austin, Texas katrin.erk@mail.utexas.edu Abstract In this paper, we be combined with deeper mod- els to obtain better predictions than from ei- ther model alone. 1 Introduction

  16. Flexible, Corpus-Based Modelling of Human Plausibility Judgements Sebastian Pad and Ulrike Pad

    E-print Network

    Padó, Sebastian

    . of Linguistics University of Texas at Austin Austin, Texas katrin.erk@mail.utexas.edu Abstract In this paper, we be combined with deeper mod- els to obtain better predictions than from ei- ther model alone. 1 Introduction

  17. Phosphoproteomic approaches to elucidate cellular signaling networks

    E-print Network

    Phosphoproteomic approaches to elucidate cellular signaling networks Katrin Schmelzle and Forest M be complemented with a variety of recently developed and improved phosphoproteomic techniques. These include developmentshave occurrednotonly inMS,however, but also in various other phosphoproteomic technologies. Thus

  18. Nutrient Management Advisory Board ~Approved ~

    E-print Network

    Guiltinan, Mark

    and Advisors were present: Members: Chris Hoffman, Swine Producer Representative James Junkin, Meat Poultry Katrine Parmley-Gates, Feed Industry Representative Bob Mikesell, representing Animal Science Academia, Fertilizer Industry Representative Ton Beachler, Egg Poultry Producer Representative Advisors: Doug Beegle

  19. Nutrient Management Advisory Board ~Approved ~

    E-print Network

    Kaye, Jason P.

    Representative Jim Brubaker, Meat Poultry Representative Bruce Lindsey, Hydrology Representative Katrine Parmley-Gates, Feed Industry Representative Denton Hawthorne, Agriculture Lender Representative Dr. Ken Kephart Poultry Producer Representative John Hess, Dairy Producer Representative Gary Heim, Non-Framer Citizen

  20. Nat. Hazards Earth Syst. Sci., 8, 509520, 2008 www.nat-hazards-earth-syst-sci.net/8/509/2008/

    E-print Network

    Paris-Sud XI, Université de

    . In this study, we explicitly con- sider the influence of dynamic human-induced changes on the occurrence (katrin.meusburger@unibas.ch) and land use the potential risks of torrents, snow gliding, avalanches, soil

  1. bersicht ber evaluierte Lehrveranstaltungen und Dozierende der Lehreinheit Textiles Gestalten Seite 1 von 2 Anrede Vorname Name Anmel

    E-print Network

    Kallenrode, May-Britt

    Übersicht über evaluierte Lehrveranstaltungen und Dozierende der Lehreinheit Textiles Gestalten Lehreinheit Frau Patricia Mühr nein Textiles Gestalten Frau Hiltrud Schäfer nein Textiles Gestalten Frau Hiltrud von der Heyde nein Textiles Gestalten Frau Katrin Gausmann nein Textiles

  2. TRITIUM-?-DECAY Experiments - the Direct way to the Absolute Neutrino Mass

    NASA Astrophysics Data System (ADS)

    Bornschein, Lutz

    2013-11-01

    Tritium-?-decay experiments provide the most sensitive approach to measure the absolute neutrino mass in a model independent way. The Karlsruhe Tritium Neutrino experiment KATRIN will measure the neutrino mass scale with an expected sensitivity of 0.2 eV/c2 (90% C.L.) and so will help to clarify the roles of neutrinos in the early universe. KATRIN investigates spectroscopically the electron spectrum from tritium ?-decay 3 H -> 3 {He} + {e}^ - + bar ? e close to the kinematic endpoint of 18.6 keV. It will use a windowless gaseous tritium source in combination with an electrostatic filter for energy analysis. KATRIN is currently under construction at the Karlsruhe Institute of Technology (KIT) Campus North. This proceeding will give an overview of the status of the main components of the KATRIN experiment.

  3. Revised CB/JT December 19, 2013 Please Note: This Course Syllabus is an important step in updating the format of our distance courses. If for any reason the Course

    E-print Network

    Saskatchewan, University of

    -oriented view to reading disability, memory processing problems, reading, writing, and arithmetic instruction abilities. · Develop the ability to critically reflect on one's mental models, policy and practice, as well Designed to facilitate a broad understanding of issues in LD as well as research-based knowledge about

  4. Academic Advising & Career Centre: A team of professionals who advise, counsel and coach individuals with their learning and career development. September 2010, source; jt. Academic Advising & Career Centre. All Rights Reserved.

    E-print Network

    Boonstra, Rudy

    or a machine that generates white noise, like a fan. And turn off that cell phone! Self-talk to Control to give something our undivided attention to the exclusion of other distractions. Most students report growing distracted. However, there are some techniques that you can utilize that may help minimize

  5. Academic Advising & Career Centre: A team of professionals who advise, counsel and coach individuals with their learning and career development. September 2010, source; jt. Academic Advising & Career Centre. All Rights Reserved.

    E-print Network

    Boonstra, Rudy

    may need to earn money to purchase an item, you may have financial needs for the school year, or you. Financial Goals. Financial goals focus on how you use money and how money influences your other goals. You

  6. Recent Developments in the Jahn–Teller Effect Theory

    Microsoft Academic Search

    Isaac B. Bersuker

    In a review paper an updated formulation of the Jahn–Teller (JT) effect (JTE) (including proper JT, pseudo JT, and Renner–Teller\\u000a (RT) effects) is given ased on the latest achievements in this field, including the conclusion that the JTE is the only source\\u000a of instability and distortion of any polyatomic system from its high-symmetry configuration. Together with the statement in\\u000a particle

  7. UFR Sciences et Techniques Master Mathmatiques et applications spcialit Mathmatiques appronfondies -semestres 3 et 4 MCC 2013-2014 C. Cont session 2 O/N C. Cont

    E-print Network

    Jeanjean, Louis

    'analyse fonctionnelle Gilles LANCIEN UE 6 25 36 12 100% oral/écrit n JT9EDP Cours fondamental d'équations aux dérivées spécialisé en analyse fonctionnelle Christian LEMERDY UE 6 25 36 100% oral/écrit n JT0CSCS Cours spécialisé DELAUNAY UE 24 25 36 100% oral/écrit n JT0DIDMA Didactique des mathématiques Stefan NEUWIRTH UE 6 26 36 M2

  8. UFR Sciences et Techniques Master Sciences pour l'ingnieur spcialit Eco-conception de produits -Semestres 3 et 4 MCC 2013-2014 C. Cont session 2 O/N C. Cont

    E-print Network

    Jeanjean, Louis

    UFR Sciences et Techniques Master Sciences pour l'ingénieur spécialité Eco-conception de produits crédits CNU CM TD TP Durée Infos % % Durée infos Durée Infos % % durée infos JT9EC1 Eco-conception 1 C 60 100% oral/écrit N JT0EC2 Eco-conception 2 B.Gaume UE 6 60 24 24 100% oral/écrit N JT0EPW1

  9. Poisson's equation for queues driven by a Markovian marked point process

    Microsoft Academic Search

    Søren Asmussen; Mogens Bladt

    1994-01-01

    LetVt be the virtual waiting time at timet in a queue having marked point process input generated by a finite Markov process {Jt}, such that in addition to Markovmodulated Poisson arrivals there may also be arrivals at jump times of {Jt}. In this setting, Poisson's equation isAg=-f whereA is the infinitesimal generator of {(Vt, Jt)}. It is shown that the

  10. Isolation and identification of phytate-degrading bacteria and their contribution to phytate mineralization in soil.

    PubMed

    Horii, Sachie; Matsuno, Toshihide; Tagomori, Junta; Mukai, Masaki; Adhikari, Dinesh; Kubo, Motoki

    2013-01-01

    To better understand the phosphorus (P) cycling in an agricultural soil environment, amounts of total, organic and inorganic P in 10 agricultural soil samples were analyzed. Since a large proportion (57.8%) of the total P in the soils was in organic form, a method was developed to evaluate the mineralization rate of organic P in the soil by adding phytate to the soil and analyzing the change in water-soluble P (WSP) content after incubating it for 3 days. Moreover, the relationship between the phytate mineralization activity and bacterial biomass in 60 agricultural soils was also investigated, where the phytate mineralization activity ranged from 0 to 61.7% (average: 18.8%), and the R² value between phytate mineralization activity and indigenous bacterial biomass was 0.11 only. Phytate-degrading bacteria were isolated from the soil environment, and identified as Pseudomonas rhodesiae JT29, JT32, JT33, JT34, JT35, Pseudomonas sp. JT30, and Flavobacterium johnsoniae JT31. When P. rhodesiae JT29 and F. johnsoniae JT31 were inoculated into the agricultural soils, the phytate mineralization activities were increased up to 16 and 27 times, respectively. It was concluded that promotion of effective phytate-degrading bacterial strains could improve the sustainable P management in the agricultural soils. PMID:24201147

  11. 14 CFR 36.1 - Applicability and definitions.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...except for airplanes that are powered by Pratt & Whitney Turbo Wasp JT3D series engines; (ii) December 31, 1974, for airplanes...75,000 pounds and that are powered by Pratt & Whitney Turbo Wasp JT3D series engines; and (iii) December 31, 1974,...

  12. 14 CFR 36.1 - Applicability and definitions.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...except for airplanes that are powered by Pratt & Whitney Turbo Wasp JT3D series engines; (ii) December 31, 1974, for airplanes...75,000 pounds and that are powered by Pratt & Whitney Turbo Wasp JT3D series engines; and (iii) December 31, 1974,...

  13. 14 CFR 36.1 - Applicability and definitions.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...except for airplanes that are powered by Pratt & Whitney Turbo Wasp JT3D series engines; (ii) December 31, 1974, for airplanes...75,000 pounds and that are powered by Pratt & Whitney Turbo Wasp JT3D series engines; and (iii) December 31, 1974,...

  14. 14 CFR 36.1 - Applicability and definitions.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ...except for airplanes that are powered by Pratt & Whitney Turbo Wasp JT3D series engines; (ii) December 31, 1974, for airplanes...75,000 pounds and that are powered by Pratt & Whitney Turbo Wasp JT3D series engines; and (iii) December 31, 1974,...

  15. PREPARED FOR THE U.S. DEPARTMENT OF ENERGY, UNDER CONTRACT DE-AC02-76CH03073

    E-print Network

    Haye, E.A. Lazarus, J. Manickam, G.A. Navratil, M. Okabayashi, J.T. Scoville, and E.J. Strait January.A. Navratil,2 M. Okabayashi,1 J.T. Scoville,3 E.J. Strait3 1Princeton Plasma Physics Laboratory, Princeton

  16. Control of the Resistive Wall Mode with Internal Coils in the

    E-print Network

    -Hopkins, R.J. La Haye, Y.Q. Liu, G.A. Navratil, H. Reimerdes, J.T. Scoville, E.J. Strait, H. Takahashi, M,+ R.J. La Haye,3 Y.Q. Liu,5 J.E. Menard,2 G.A. Navratil,1 M. Okabayashi,2 J.T. Scoville,3 E.J. Strait

  17. Understanding the use of intimidation as a response to job tension : Career implications for the global leader

    Microsoft Academic Search

    Vickie Coleman Gallagher; Kenneth J. Harris; Matthew Valle

    2008-01-01

    Purpose – The purpose of this paper is to investigate the relationship between job tension (JT) and the use of intimidation in the workplace, as well as positive and negative affectivity as two potential personality trait moderators of this relationship. Design\\/methodology\\/approach – The paper hypothesizes that employees would use more intimidation when they perceive higher levels of JT based on

  18. 10.1101/gr.071886.107Access the most recent version at doi: 2008 18: 717-728; originally published online Mar 13, 2008;Genome Res.

    E-print Network

    Feschotte, Cedric

    , Heidi J.T. Pagan, Jeremy D. Smith, Ellen J. Pritham, Peter Arensburger, lucifugus MyotisMultiple waves bywww.genome.orgDownloaded from #12;Multiple waves of recent DNA transposon activity in the bat, Myotis lucifugus David A. Ray,1,5,6 Cedric Feschotte,2,5 Heidi J.T. Pagan,1 Jeremy D. Smith,1 Ellen J. Pritham,2

  19. Portfolio screening to support the mainstreaming of adaptation to

    E-print Network

    Watson, Andrew

    assistance Richard J.T. Klein, Siri E.H. Eriksen, Lars Otto Næss, Anne Hammill, Thomas M. Tanner, Carmenza assistance Richard J.T. Klein1* , Siri E.H. Eriksen2 , Lars Otto Næss3,4 , Anne Hammill5 , Thomas M. Tanner6

  20. The size and polydispersity of silica nanoparticles under simulated hot spring conditions

    E-print Network

    Benning, Liane G.

    and Environment, University of Leeds, Leeds, LS2 9JT, UK 2 Institute of Integrative and Comparative Biology, Faculty of Biological Science, University of Leeds, Leeds, LS2 9JT, UK ABSTRACT The nucleation and growth-mail: tobler@see.leeds.ac.uk DOI: 10.1180/minmag.2008.072.1.287 Mineralogical Magazine, February 2008, Vol. 72

  1. Electron-phonon coupling in charge-transfer and crystal-field states of Jahn-Teller CuCl6

    E-print Network

    Rodríguez, Fernando

    39005, Spain Received 25 March 1999 In this work we present an octahedral perturbative model to explain energy to complex distortions of the totally symmetric mode Qa1g and the JT mode Q , as a function) from structural correlations along a series of copper compounds. The corresponding JT coupling

  2. A 2.5-Kelvin Gifford-McMahon/Joule-Thomson Cooler for Cavity Maser Applications

    NASA Astrophysics Data System (ADS)

    Britcliffe, M.; Hanson, T.; Fernandez, J.

    2001-07-01

    A 2.5-K cooler suitable for cooling cavity maser amplifiers is described. The device combines a 4-K Gifford-McMahon (GM) refrigerator with a Joule-Thomson (JT) circuit to provide 180 mW of cooling at 2.5 K. The device is compact and can operate in any physical orientation. A commercial two-stage GM cooler pre-cools the helium JT circuit flow. The JT circuit can be simplified as compared with existing systems. Only two counter flow heat exchangers are necessary. The 4-K GM operating temperature also allows the use of a single-stage compressor for the JT circuit. The JT circuit operates with a supply pressure of only 110 kPa. A commercial scroll vacuum pump is used as a compressor. The simplified system can be fabricated for less than the cost of current 4.5-K maser coolers

  3. A Search for Hadamard Matrices constructed from Williamson Matrices

    E-print Network

    Seberry, Jennifer

    , B, C, D of order n which satisfy XYT = YXT ,X,Y {A,B,C,D} #12;Further, suppose AAT +BBT +CCT +DDT s j=1 ti j(j +n- j ),i = 1,2,3,4 (4) where s = 1 2 (n-1), is a nth root of unity, exactly one of t1 j,t2 j,t3 j,t4 j is nonzero and equals ±1 for each 1 j s, and µ2 1 +µ2 2 +µ2 3 +µ2 4 = 4n

  4. BioMed Central Page 1 of 13

    E-print Network

    Wirth, Thierry

    Schwenkenbecher1, Katrin Kuhls1 and Gabriele Schönian*1 Address: 1Department of Parasitology, Institute National d'Histoire Naturelle, 16 rue Buffon, 72231 Paris cedex 05, France, 4Department of Parasitology of Medical Protozoology, Martsinovsky Institute of Medical Parasitology and Tropical Medicine, Sechenov

  5. Conditions for detecting CP violation via neutrinoless double beta decay

    E-print Network

    Alicja Joniec; Marek Zralek

    2005-12-30

    Neutrinoless double beta decay data together with information on the absolute neutrino masses obtained from the future KATRIN experiment and/or astrophysical measurements give a chance to find CP violation in the lepton sector with Majorana neutrinos. We derive and discuss necessary conditions which make discovery of such CP violation possible for the future neutrino oscillation and mass measurements data.

  6. American Mineralogist, Volume 92, pages 973976, 2007 0003-004X/07/0506973$05.00/DOI: 10.2138/am.2007.2560 973

    E-print Network

    Smyth, Joseph R.

    Crystal chemistry of hydration in aluminous orthopyroxene JOSEPH R. SMYTH,1, * KATRIN MIERDEL,2 HANS Padova, Italy ABSTRACT Hydrogen incorporation in aluminous orthopyroxene may control the generation or garnet are also typically quite aluminous with 2 to 11 wt% Al2O3 (Takeda 1972; Arai and Abe 1995

  7. Lead levels in domestic water supplies and neural tube defects in Glasgow

    Microsoft Academic Search

    J E Macdonell; H Campbell; D H Stone

    2000-01-01

    OBJECTIVETo study the association between “pregnancy” prevalence (affected births and terminations) of neural tube defects in postcode districts of Glasgow and lead concentrations in domestic water.SETTINGPostcode districts of Glasgow supplied by water from the Loch Katrine reservoir.DESIGNAn ecological study. Lead concentrations from 1911 randomly selected domestic water samples were obtained from the Glasgow 93 lead study. Neural tube defects (affected

  8. Finite pseudocomplemented lattices: The spectra and the Glivenko congruence

    E-print Network

    Katrinak, Tibor

    atoms. For a finite pseudocomplemented lattice L with spectral length n, define the spectrum of L on this paper, the authors were supported by VEGA grant No. 1/0588/09 of Slovak Republic. 1 #12;2 T. KATRIN] as follows: Theorem 1.1. A sequence s=(1, s1, . . . , sn) of positive integers is the spectrum of a finite

  9. Environmental Biology of Fishes 56: 325331, 1999. 1999 Kluwer Academic Publishers. Printed in the Netherlands.

    E-print Network

    Schlupp, Ingo

    of P. formosa, sperm are provided by males of two species, Poecilia mexicana Steindachner, 1863 in the Netherlands. A sexual preference in the Amazon molly, Poecilia formosa Katrin Landmanna , Jakob Parzefalla selection, gynogen, fish, ontogeny Synopsis The Amazon molly, Poecilia formosa, is an all-female species

  10. Environmental contaminants in oil field produced waters discharged into wetlands

    SciTech Connect

    Ramirez, P. Jr. [Fish and Wildlife Service, Cheyenne, WY (United States)

    1994-12-31

    The 866-acre Loch Katrine wetland complex in Park County, Wyoming provides habitat for many species of aquatic birds. The complex is sustained primarily by oil field produced waters. This study was designed to determine if constituents in oil field produced waters discharged into Custer Lake and to Loch Katrine pose a risk to aquatic birds inhabiting the wetlands. Trace elements, hydrocarbons and radium-226 concentrations were analyzed in water, sediment and biota collected from the complex during 1992. Arsenic, boron, radium-226 and zinc were elevated in some matrices. The presence of radium-226 in aquatic vegetation suggests that this radionuclide is available to aquatic birds. Oil and grease concentrations in water from the produced water discharge exceeded the maximum 10 mg/l permitted by the WDEQ (1990). Total aliphatic and aromatic hydrocarbon concentrations in sediments were highest at the produced water discharge, 6.376 {mu}g/g, followed by Custer Lake, 1.104 {mu}g/g. The higher levels of hydrocarbons found at Custer Lake, compared to Loch Katrine, may be explained by Custer Lake`s closer proximity to the discharge. Benzo(a)pyrene was not detected in bile from gadwalls collected at Loch Katrine but was detected in bile from northern shovelers collected at Custer Lake. Benzo(a)pyrene concentrations in northern shoveler bile ranged from 500 to 960 ng/g (ppb) wet weight. The presence of benzo(a)pyrene in the shovelers indicates exposure to petroleum hydrocarbons.

  11. NUTRIENT MANAGEMENT ADVISORY BOARD BOARD MEMBERS

    E-print Network

    Guiltinan, Mark

    POULTRY PRODUCER REPRESENTATIVE TOM BEACHLER KREIDER FARMS MANHEIM, PA 17545 Term: July 1, 2009 ­ June 30 Term: July 1, 2011 - June 30, 2014 FEED INDUSTRY REPRESENTATIVE KATRINE L. S. PARMLEY-GATES CUMBERLAND LIVESTOCK (MEAT POULTRY) PRODUCER REP. JAMES JUNKIN WILLOW HILL, PA 17271 Term: July 1, 2011 - June 30, 2014

  12. COMBINING ARTICULATORY AND ACOUSTIC INFORMATION FOR SPEECH RECOGNITION IN NOISY AND REVERBERANT

    E-print Network

    Kirchhoff, Katrin

    COMBINING ARTICULATORY AND ACOUSTIC INFORMATION FOR SPEECH RECOGNITION IN NOISY AND REVERBERANT 100 131, 33501 Bielefeld, Germany katrin@techfak.uni­bielefeld.de ABSTRACT Robust speech recognition. 1. INTRODUCTION Whereas most speech recognition systems use a cepstral or spec­ tral representation

  13. The record of historic earthquakes in lake sediments of Central Switzerland

    E-print Network

    Gilli, Adrian

    The record of historic earthquakes in lake sediments of Central Switzerland Katrin Moneckea, ETH Zu¨rich, Sonneggstr. 5, Zu¨rich 8092, Switzerland b Geophysical Institute, ETH Ho¨nggerberg, Zu¨rich 8093, Switzerland c Sedimentology Section, Department of Surface Waters (SURF), EAWAG, Du¨bendorf 8600

  14. Seismic Behavior of existing Swiss Reinforced Concrete Bridge Piers

    E-print Network

    Supervisors Prof. Katrin Beyer 1, Dr. Alessandro Dazio 2 1 Earthquake Engineering and Structural Dynamics Laboratory (EESD) / 2 Centre for Post-Graduate Training and Research in Earthquake Engineering and Engineering Seismology (ROSE School), Italy / EDCE 2011 / Project partner: Office fédéral des routes OFROU

  15. High resolution structural investigation of synthetic and natural 2:1 clay-mineral assemblages using

    E-print Network

    Barnes, Sarah-Jane

    using advanced sample preparation and electron microscopy imaging techniques Dirk Schumann Department this thesis project was completed; my wife Katrin Schumann, mother Kerstin J. Schumann, father Bernd H-fringe images. As these clay minerals are interpreted to replicate by template-catalyzed polymerization

  16. bersicht ber evaluierte Lehrveranstaltungen und Dozierende der Lehreinheit Psychologie Seite 1 von 7 Anrede Vorname Name Anmel

    E-print Network

    Kallenrode, May-Britt

    [keine Lehre im WS 11/12] Psychologie Frau Regina Bode [keine Lehre im WS 11/12] Psychologie Frau Dr 11/12] Psychologie Frau Katrin Hötzel [keine Lehre im WS 11/12] Psychologie Frau Julia Lange [keine Lehre im WS 11/12] Psychologie Frau Linda Pruß [keine Lehre im WS 11/12] Psychologie Frau

  17. Monte Carlo Calculations of the Intrinsic Detector Backgrounds for the Karlsruhe Tritium Neutrino Experiment

    E-print Network

    Washington at Seattle, University of - Department of Physics, Electroweak Interaction Research Group

    Monte Carlo Calculations of the Intrinsic Detector Backgrounds for the Karlsruhe Tritium Neutrino of the Intrinsic Detector Backgrounds for the Karlsruhe Tritium Neutrino Experiment Michelle L. Leber Chair of the Supervisory Committee: Professor John F. Wilkerson Physics The Karlsruhe Tritium Neutrino Experiment (KATRIN

  18. Constraints on dispersal and the evolution of the avifauna of the Northern Hemisphere

    E-print Network

    Brown, James H.

    Constraints on dispersal and the evolution of the avifauna of the Northern Hemisphere KATRIN BOÈ, the avifaunas of North America and Eurasia include several families and many genera that are not established America on the composition of the North American avifauna. He noted that it is composed not only

  19. Documents de Travail du Centre d'Economie de la Sorbonne

    E-print Network

    Boyer, Edmond

    ;Investments in Quality, Collective Reputation and Information Acquisition Fulvio Fontini Katrin Millock Michele Moretto May 5, 2013 Abstract In many cases consumers cannot observe firms' investment in qual- ity of the collective investment game of the firms may be stochastic since firms cannot control perfectly the technology

  20. 77 FR 60434 - Ocean Transportation Intermediary License Applicants

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-10-03

    ...Type: New NVO & OFF License. J&T Logistics Inc. dba EDI Logistics Group (NVO & OFF), 18747 S. Laurel Park Road, Rancho Dominguez, CA 90220...Application Type: New OFF License. KT Logistics, Inc. (NVO & OFF), 1470 W....

  1. Marketing: The Applicant Questionnaire

    ERIC Educational Resources Information Center

    Huddleston, Thomas, Jr.

    1976-01-01

    The construction of a market research questionnaire is recommended as one way a college can identify its applicant pool market. Included are an outline of information the applicant pool questionnaire might seek and basic criteria of question writing. (JT)

  2. Bill of Rights for Nominees; Bill of Particulars for Search Committees

    ERIC Educational Resources Information Center

    Evans, Byron F.

    1976-01-01

    Analyzes the job of a search committee responsible for filling college administrative positions suggesting do's and don'ts for committee membership, candidate selection criteria, screening, interviewing, testing the references, decision by fatigue, and notifying the finalists. (JT)

  3. Flight effects of fan noise

    NASA Technical Reports Server (NTRS)

    Chestnutt, D. (editor)

    1982-01-01

    Simulation of inflight fan noise and flight effects was discussed. The status of the overall program on the flight effects of fan noise was reviewed, and flight to static noise comparisons with the JT15D engine were displayed.

  4. Journal of Mathematical Psychology 58 (2014) 2132 Contents lists available at ScienceDirect

    E-print Network

    Townsend, James T.

    2014-01-01

    .g., Donders, 1868) was seminal in this regard, although other researchers, such as W. Wundt, were more@indiana.edu (J.T. Townsend). The serial vs. parallel topic is our primary concern here. How- ever, it may

  5. & 1234 0 5 6 . 6

    E-print Network

    Leeds, University of

    , Leeds, LS2 9JT, UK 4British Geological Survey, Kingsley Dunham Centre, Keyworth, Nottingham, NG12 5GG, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK 3School of Earth and Environment, University of Leeds

  6. Social Services: Recreation Occupations

    ERIC Educational Resources Information Center

    Rones, Philip L.

    1976-01-01

    Description of recreation services for the elderly in two areas, community recreation and therapeutic recreation, includes employment information for the various levels: Recreation director, supervisor, leader, activity specialist, and aide. (JT)

  7. Towards a Portable Marxist Criticism: A Critique and Suggestion.

    ERIC Educational Resources Information Center

    Pfeil, Fred

    1980-01-01

    Reviews the recent work of Terry Eagleton and Raymond Williams, two proponents of Marxist literary theory. Considers the strengths and weaknesses of each writer, outlining an approach to Marxist literary criticism that blends the two theories. (JT)

  8. PREPARED FORTHE U.S. DEPARTMENT OF ENERGY, UNDER CONTRACT DEAC0276CH03073

    E-print Network

    .A. Lazarus, J. Manickam, G.A. Navratil, Okabayashi, J.T. Scoville, and E.J. Strait January 2001 #12; PPPL. Okabayashi, 1 Scoville, 3 Strait 1 Princeton Plasma Physics Laboratory, Princeton, Jersey Columbia University

  9. arXiv:0905.3291v1[astro-ph.HE]20May2009 DRAFT VERSION MAY 20, 2009

    E-print Network

    , University of Leeds, Leeds, LS2 9JT, UK 8 Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cam School of Physics, University College Dublin, Belfield, Dublin 4, Ire- land 11 School of Physics

  10. Automated Pivot Location for the Cartesian-Polar Hybrid

    E-print Network

    Hogg, David

    and David Hogg School of Computer Studies, University of Leeds, Leeds LS2 9JT, UK email: ajh is that training is fully auto- matic (apart from landmark point generation). The Hybrid PDM requires land- mark

  11. Proceedings on the Workshop on METHODOLOGIES FOR INTERNATIONAL

    E-print Network

    . Nyboer , J.T. Oliver , A. Pape , E. Worrell , K. Blok Utrecht University , Simon Fraser University #12.T. Oliver , A. Pape , E. Worrell , K. Blok Contacts: John Nyboer Dian Phylipsen REM. Simon Fraser

  12. Analytical Models for Flowing-Fluid Temperature Distribution in Single-Phase Oil Reservoirs Accounting for Joule-Thomson Effect 

    E-print Network

    Chevarunotai, Natasha

    2014-11-13

    temperature alteration in the reservoir. In this study, we developed a robust analytical model to estimate the flowing-fluid-temperature distribution in the reservoir accounting for J-T heating or cooling effect. All significant heat-transfer mechanisms...

  13. Depression in Children and Teens

    MedlinePLUS

    ... and teens do best when they get both counseling and medicine. This content has been supported by Forest Laboratories Inc. Bibliography Depression in Children and Adolescents by SE Son M.D. and JT Kirchner, ...

  14. Aeroallergens, Allergic Disease, and Climate Change: Impacts and Adaptation

    E-print Network

    Reid, Colleen E.; Gamble, Janet L.

    2009-01-01

    global warming emissions can improve local public health.global warming. Many climate change mitigation strategies have various healthHealth Perspectives Root TL, Price JT, Hall KR, Schneider SH, Rosenzweig C, Pounds JA (2003) Fingerprints of global warming

  15. Sharing Teaching Ideas

    ERIC Educational Resources Information Center

    Mathematics Teacher, 1977

    1977-01-01

    The topics discussed are, "Helping Students Understand the Distributive Property,""Converting from Base 10: Nonintegral Bases?,""Rapid Mental Squaring of Mixed Numbers," and "Some Nonstandard Binary Operations and their Properties." (JT)

  16. Exploration of Home Economics Related Occupations in Clothing

    ERIC Educational Resources Information Center

    Thomas, Virginia F.; Plumb, Sandra

    1976-01-01

    A five-unit lesson plan is presented titled "Introduction to Careers in the Fashion Industry" which involved three sections of a ninth grade home economics class in an assembly line sewing experience in a clothing production factory. (JT)

  17. Large-Scale Mapping and Validation of Escherichia coli Transcriptional Regulation

    E-print Network

    Collins, James J.

    of Expression Profiles Jeremiah J. Faith1[ , Boris Hayete1[ , Joshua T. Thaden2,3 , Ilaria Mogno2,4 , Jamey. Citation: Faith JJ, Hayete B, Thaden JT, Mogno I, Wierzbowski J, et al. (2007) Large-scale mapping

  18. Formation of hydroxysulphate and hydroxycarbonate green rusts in the presence of zinc using time-resolved in situ small and wide

    E-print Network

    Benning, Liane G.

    and Environment, University of Leeds, Leeds, LS2 9JT, UK ABSTRACT The formation and transformation and * E-mail: i.ahmed@see.leeds.ac.uk DOI: 10.1180/minmag.2008.072.1.159 Mineralogical Magazine, February

  19. The metagenomics of biosilicification: causes and effects L. G. BENNING* AND D. J. TOBLER

    E-print Network

    Benning, Liane G.

    and Biosphere Institute, School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK ABSTRACT; * E-mail: liane@see.leeds.ac.uk DOI: 10.1180/minmag.2008.072.1.221 Mineralogical Magazine, February

  20. Spectrophotometric determination of low-level concentrations of Se in aqueous solutions

    E-print Network

    Benning, Liane G.

    of Leeds, Leeds LS2 9JT, UK ABSTRACT This paper describes the design, testing and validation of a simple.1180/minmag.2008.072.1.451 Mineralogical Magazine, February 2008, Vol. 72(1), pp. 451­454 # 2008

  1. Green rust as a precursor for magnetite: an in situ synchrotron based study

    E-print Network

    Benning, Liane G.

    , University of Leeds, Leeds, LS2 9JT, UK ABSTRACT In this study, direct evidence for the formation.072.1.201 Mineralogical Magazine, February 2008, Vol. 72(1), pp. 201­204 # 2008 The Mineralogical Society #12;Materials

  2. Teasing Hamsters in Electric Cages?

    ERIC Educational Resources Information Center

    Page, Colin Flood

    1975-01-01

    Reviews several studies that examine the climate of feeling surrounding training courses for college teachers and the general social atmosphere of the job into which the trainee is being initiated. (JT)

  3. Statistical Methods for Automatic Interpretation of Digitally Scanned Fingerprints

    E-print Network

    Haase, Markus

    .J. Baczkowski, X. Feng, T.J. Hainsworth Department of Statistics, University of Leeds, Leeds LS2 9JT, U Scanned Fingerprints K.V. Mardia, A.J. Baczkowski, X. Feng, T.J. Hainsworth Department of Statistics

  4. Evidence-Based Cognitive Rehabilitation: Updated Review of the Literature From 1998 Through 2002

    Microsoft Academic Search

    Keith D. Cicerone; Cynthia Dahlberg; James F. Malec; Donna M. Langenbahn; Thomas Felicetti; Sally Kneipp; Wendy Ellmo; Kathleen Kalmar; Joseph T. Giacino; J. Preston Harley; Linda Laatsch; Philip A. Morse; Jeanne Catanese

    2005-01-01

    Cicerone KD, Dahlberg C, Malec JF, Langenbahn DM, Felicetti T, Kneipp S, Ellmo W, Kalmar K, Giacino JT, Harley JP, Laatsch L, Morse PA, Catanese J. Evidence-based cognitive rehabilitation: updated review of the literature from 1998 through 2002.

  5. Please cite this article in press as: Birkholzer, J.T., et al., Brine flow up a well caused by pressure perturbation from geologic carbon sequestration: Static and dynamic evaluations. Int. J. Greenhouse Gas Control (2011), doi:10.1016/j.ijggc.2011.01.003

    E-print Network

    Zhou, Quanlin

    2011-01-01

    by pressure perturbation from geologic carbon sequestration: Static and dynamic evaluations. Int. J.elsevier.com/locate/ijggc Brine flow up a well caused by pressure perturbation from geologic carbon sequestration: Static carbon sequestration (GCS) has drawn increasing con- sideration as a promising method to mitigate

  6. (MIRU2009)!W2009 G/7 7n J#?t7ONs$NV:"A4J0L%+%a%i2hA--$NBP1~IU$1$K$h$k9-0hET;T%b%G%k9=C[

    E-print Network

    Tokyo, University of

    @cgv.ics.saitama-u.ac.jp Abstract The acquisition of a 3D shape of a scene as well as the position and posture of the sensor has, a system that consists of a laser range sensor, Global Positioning System (GPS), and Gyro sensor has been,AuCV!$$^$?B?$/$N¿l9g!$B,0L AuCV!JGPS!$%8%c%$%m%;%s%5$J$I!K$J$I@lMQ$NAuCV$r@Q :"$7$?¡VN¿$d9R6u5!$J$I$,$=$N¡gLr$rC4$C$F$*$j!$¿&MQ

  7. Experimental investigation on mixed refrigerant Joule–Thomson cryocooler with flammable and non-flammable refrigerant mixtures

    Microsoft Academic Search

    N. S. Walimbe; K. G. Narayankhedkar; M. D. Atrey

    2010-01-01

    The mixed refrigerant Joule–Thomson (MR J–T) cryocoolers have a wide application area covering the temperature range from 80K to 200K. The significant advantages of the system are simplicity of its design and working reliability with high level performance. The present paper discusses the experimental results of MR J–T cooler with different flammable and non-flammable mixture compositions. The work highlights the

  8. Design and optimization of a two-stage 28 K Joule-Thomson microcooler

    Microsoft Academic Search

    H. S. Cao; A. V. Mudaliar; J. H. Derking; P. P. P. M. Lerou; H. J. Holland; D. R. Zalewski; S. Vanapalli; H. J. M. ter Brake

    Micro Joule-Thomson (JT) coolers made from glass wafers have been investigated for many years at the University of Twente. After successful realization of a single-stage JT microcooler with a cooling capacity of about 10 mW at 100 K, a two-stage microcooler is being researched to attain a lower temperature of about 30 K. By maximizing the coefficient of performance (COP)

  9. Density-functional studies of the electronic structure of the perovskite oxides: La1?xCaxMnO3

    Microsoft Academic Search

    S. Satpathy; Zoran S. Popovic´; Filip R. Vukajlovic´

    1996-01-01

    Using density-functional methods, we study the electronic structures of the lanthanum-based ‘‘double-exchange’’ perovskite magnets. Antiferromagnetic insulating solutions are obtained for both the end members, LaMnO3 and CaMnO3, within the local density approximation (LDA), with the Jahn-Teller (JT) distortion of the oxygen octrahedron taken into account. The JT distortion splits off the Mn(3d)eg bands producing an energy gap within the LDA,

  10. Busy period analysis, rare events and transient behavior in fluid flow models

    Microsoft Academic Search

    Søren Asmussen

    1994-01-01

    We consider a process {(Jt, Vt)}t >0 on Ex(0, o), such that {Jr} is a Markov process with finite state space-E, and {Vt} has a linear drift r on intervals where Jt- and reflection at 0. Such a process arises as a fluid flow model of current interest in telecommunications engineering for the purpose of modeling ATM technology. We compute

  11. DATA ANALYSIS FOR RESONANT GRAVITATIONAL WAVE ANTENNAE: INTERNAL VETOES AND 2 LIKE TEST

    E-print Network

    and dc­SQUID amplifier) etc. At least part of these events should lack the specific signature of a force index, j(t i ) has zero mean and correlation hj(t i )j(t i )i = oe ij (h: : :i means ensemble average of the correlation matrix oe ij . For given values of t 0 and # the minimum of \\Lambda(A; t 0 ; #) as a function

  12. SU-E-T-187: Feasibility Study of Stereotactic Liver Radiation Therapy Using Multiple Divided Partial Arcs in Volumetric Modulated Arc Therapy

    SciTech Connect

    Lin, Y; Ozawa, S; Tsegmed, U; Nakashima, T; Shintaro, T; Ochi, Y; Kawahara, D; Kimura, T; Nagata, Y [Hiroshima University, Hiroshima, Hiroshima (Japan)

    2014-06-01

    Purpose: To verify volumetric modulated arc therapy (VMAT) using flattening filter free (FFF) mode with jaw tracking (JT) feature for single breath hold as long as 15 s per arc in liver stereotactic body radiation therapy (SBRT) against intensity modulated radiation therapy (IMRT) FFF-JT. Methods: Ten hepatocellular carcinoma (HCC) cases were planned with 10 MV FFF using Pinnacle3 treatment planning system which delivered by TrueBeam to administer 48 Gy/ 4 fractions. Eight non-coplanar beams were assigned to IMRT using step-and-shoot technique. For VMAT, two or three non-coplanar partial arcs (up to 180 degrees) were further divided into subarcs with gantry rotation less than 80 degrees to limit delivery time within 15 s. Dose distributions were verified using OCTAVIUS II system and pass rates were evaluated using gamma analysis with criteria of 3%/3 mm at threshold of 5% to the maximum dose. The actual irradiation time was measured. Results: The VMAT-FFF-JT of partial-arcs with sub-divided arcs was able to produce a highly conformal plan as well as IMRT-FFF-JT. Isodose lines and DVH showed slight improvement in dosimetry when JT was employed for both IMRT and VMAT. Consequently, VMAT-FFF-JT was superior in reducing the dose to liver minus gross tumor volume. VMAT-FFF-JT has shorter total treatment time compared with 3D conformal radiation therapy (3D-CRT) FFF because the gantry was rotated simultaneously with the beam delivery in VMAT. Moreover, due to the small and regular shape of HCC, VMAT-FFF-JT offered less multileaf collimator motion, thus the interplay effect is expected to be reduced. The patient specific QA of IMRT and VMAT acquired the pass rates higher than 90%. Conclusion: VMAT-FFF-JT could be a promising technique for liver SBRT as the sub-divided arcs method was able to accommodate a single breath hold irradiation time of less than 15 s without deterioration of the dose distribution compared with IMRT-FFF-JT.

  13. Experimental study of a mixed refrigerant Joule-Thomson cryocooler using a commercial air-conditioning scroll compressor

    NASA Astrophysics Data System (ADS)

    Lee, Jisung; Lee, Kyungsoo; Jeong, Sangkwon

    2013-05-01

    Mixed refrigerant Joule-Thomson (MR J-T) cryocoolers have been used to create cryogenic temperatures and are simple, efficient, cheap, and durable. However, compressors for MR J-T cryocoolers still require optimization. As the MR J-T cryocooler uses a commercial scroll compressor developed for air-conditioning systems, compressor overheating due to the use of less optimized refrigerants may not be negligible, and could cause compressor malfunction due to burn-out of scroll tip seals. Therefore, in the present study, the authors propose procedures to optimize compressor operation to avoid the overheating issue when the MR J-T cryocooler is used with a commercial oil lubricated scroll compressor, and the present experimental results obtained for a MR J-T cryocooler. A single stage 1.49 kW (2 HP) scroll compressor designed for R22 utilizing a mixture of nitrogen and hydrocarbons was used in the present study. As was expected, compressor overheating and irreversible high temperatures at a compressor discharge port were found at the beginning of compressor operation, which is critical, and hence, the authors used a water injection cooling system for the compressor to alleviate temperature overshooting. In addition, a portion of refrigerant in the high-pressure stream was by-passed into the compressor suction port. This allowed an adequate compression ratio, prevented excessive temperature increases at the compressor discharge, and eventually enabled the MR J-T cryocooler to operate stably at 121 K. The study shows that commercial oil lubricated scroll compressors can be used for MR J-T cryocooling systems if care is exercised to avoid compressor overheating.

  14. Performance of a TiN-coated monolithic silicon pin-diode array under mechanical stress

    E-print Network

    B. A. VanDevender; L. I. Bodine; A. W. Myers; J. F. Amsbaugh; M. A. Howe; M. L. Leber; R. G. H. Robertson; K. Tolich; T. D. Van Wechel; B. L. Wall

    2012-02-01

    The Karlsruhe Tritium Neutrino Experiment (KATRIN) will detect tritium beta- decay electrons that pass through its electromagnetic spectrometer with a highly- segmented monolithic silicon pin-diode focal-plane detector (FPD). This pin-diode array will be on a single piece of 500-{\\mu}m-thick silicon, with contact between titanium nitride (TiN) coated detector pixels and front-end electronics made by spring-loaded pogo pins. The pogo pins will exert a total force of up to 50N on the detector, deforming it and resulting in mechanical stress up to 50 MPa in the silicon bulk. We have evaluated a prototype pin-diode array with a pogo-pin connection scheme similar to the KATRIN FPD. We find that pogo pins make good electrical contact to TiN and observe no effects on detector resolution or reverse-bias leakage current which can be attributed to mechanical stress.

  15. Direct determination of Neutrino Mass from Tritium Beta Spectrum

    E-print Network

    Weinheimer, C

    2009-01-01

    The investigation of the endpoint region of the tritium beta decay spectrum is still the most sensitive direct method to determine the neutrino mass scale. In the nineties and the beginning of this century the tritium beta decay experiments at Mainz and Troitsk have reached a sensitivity on the neutrino mass of 2 eV/c^2 . They were using a new type of high-resolution spectrometer with large sensitivity, the MAC-E-Filter, and were studying the systematics in detail. Currently, the KATRIN experiment is being set up at Forschungszentrum Karlsruhe, Germany. KATRIN will improve the neutrino mass sensitivity by one order of magnitude down to 0.2 eV/c^2, sufficient to cover the degenerate neutrino mass scenarios and the cosmologically relevant neutrino mass range.

  16. Direct determination of Neutrino Mass from Tritium Beta Spectrum

    E-print Network

    C. Weinheimer

    2009-12-08

    The investigation of the endpoint region of the tritium beta decay spectrum is still the most sensitive direct method to determine the neutrino mass scale. In the nineties and the beginning of this century the tritium beta decay experiments at Mainz and Troitsk have reached a sensitivity on the neutrino mass of 2 eV/c^2 . They were using a new type of high-resolution spectrometer with large sensitivity, the MAC-E-Filter, and were studying the systematics in detail. Currently, the KATRIN experiment is being set up at Forschungszentrum Karlsruhe, Germany. KATRIN will improve the neutrino mass sensitivity by one order of magnitude down to 0.2 eV/c^2, sufficient to cover the degenerate neutrino mass scenarios and the cosmologically relevant neutrino mass range.

  17. The challenge of self-governance in complex, globalizing economies: Collection of revised papers of a PhD seminar

    Microsoft Academic Search

    Elinor Ostrom; Achim Schlüter

    2007-01-01

    Table of Contents: Floriane Clement: A Multi-Scale Analysis of Institutions, Interestsand Beliefs Associated With Forest Policies. Insights from NorthernVietnam; Katrin Daedlow, Robert Arlinghaus, Volker Beckmann: Collective Choice on Different Spatial Levels and over Time: A Framework to Analyze Adaptation and Sustainability of Common Pool Resource Management in German Recreational Fisheries (GRF); Eva Ebenhöh: Designing Agent-Based Models of Water Management Regimes

  18. Comparison of particle confinement in the high confinement mode plasmas with the edge localized mode of the Japan Atomic Energy Research Institute Tokamak-60 Upgrade and the DIII-D tokamak

    NASA Astrophysics Data System (ADS)

    Takenaga, H.; Mahdavi, M. A.; Baker, D. R.

    2001-05-01

    Particle confinement was compared for the high confinement mode plasmas with the edge localized mode in the Japan Atomic Energy Research Institute Tokamak-60 Upgrade (JT-60U) [S. Ishida, JT-60 Team, Nucl. Fusion 39, 1211 (1999)] and the DIII-D tokamak [J. L. Luxon et al., Plasma Physics and Controlled Nuclear Fusion Research 1986 (International Atomic Energy Agency, Vienna, 1987), Vol. 1, p. 159] considering separate confinement times for particles supplied by neutral beam injection (NBI) (center fueling) and by recycling and gas-puffing (edge fueling). Similar dependence on the NBI power was obtained in JT-60U and DIII-D. The particle confinement time for center fueling in DIII-D was smaller by a factor of 4 in the low density discharges and by a factor of 1.8 in the high density discharges than JT-60U scaling, respectively, suggesting the stronger dependence on the density in DIII-D. The particle confinement time for edge fueling in DIII-D was comparable with JT-60U scaling in the low density discharges. However, it decreased to a much smaller value in the high density discharges.

  19. Methylobacterium marchantiae sp. nov., a pink-pigmented, facultatively methylotrophic bacterium isolated from the thallus of a liverwort.

    PubMed

    Schauer, S; Kämpfer, P; Wellner, S; Spröer, C; Kutschera, U

    2011-04-01

    A pink-pigmented, facultatively methylotrophic bacterium, designated strain JT1(T), was isolated from a thallus of the liverwort Marchantia polymorpha L. and was analysed by using a polyphasic approach. Comparative 16S rRNA gene sequence analysis placed the strain in a clade with Methylobacterium adhaesivum AR27(T), Methylobacterium fujisawaense DSM 5686(T), Methylobacterium radiotolerans JCM 2831(T) and Methylobacterium jeotgali S2R03-9(T), with which it showed sequence similarities of 97.8, 97.7, 97.2 and 97.4?%, respectively. However, levels of DNA-DNA relatedness between strain JT1(T) and these and the type strains of other closely related species were lower than 70?%. Cells of JT1(T) stained Gram-negative and were motile, rod-shaped and characterized by numerous fimbriae-like appendages on the outer surface of their wall (density up to 200 µm(-2)). Major fatty acids were C(18?:?1)?7c and C(16?:?0). Based on the morphological, physiological and biochemical data presented, strain JT1(T) is considered to represent a novel species of the genus Methylobacterium, for which the name Methylobacterium marchantiae sp. nov. is proposed. The type strain is JT1(T) (?=?DSM 21328(T) ?=?CCUG 56108(T)). PMID:20495043

  20. Phase Diagram of the Two-Leg t--J Ladder

    NASA Astrophysics Data System (ADS)

    Müller, T.; Rice, T. M.

    1998-03-01

    The 2-leg t--J ladder forms a spin liquid at half-filling which evolves to a Luther-Emery liquid upon doping. Our aim is to obtain a complete phase diagram for isotropic coupling (i.e. rungs and legs equal) as a function of electron density n and the ratio J/t. Two known limiting cases are: n<1/2 which is a single band Luttinger liquid and n < [-3.3mm] ~1 for J/t --> 0 which is a Nagaoka ferromagnet. Using Lanczos techniques we examine the region between the Nagaoka and Luther--Emery phases for 1>n>1/2. We find evidences for gapless behavior in both spin and charge channels for J/t < ~0.3 consistent with Luttinger liquids in both bonding and anti-bonding bands (i.e., C2S2). This proposal is based on the behavior of spin and charge correlation functions. For example the hole--hole correlation function which displays hole pairing at larger J/t, shows hole--hole repulsion in this region. As a further test, we examined the dependence of the energy on a relative phase shift between bonding and antibonding bands. For J/t < ~0.3 this is very weak, indicating a lack of pairing in this channel.

  1. Phase diagram of coupled ladders

    NASA Astrophysics Data System (ADS)

    Müller, T. F. A.; Rice, T. M.

    1998-08-01

    The two-leg t-J ladder forms a spin liquid at half filling that evolves to a Luther-Emery liquid upon doping. Our aim is to obtain a complete phase diagram for isotropic coupling (i.e., rungs and legs equal) as a function of electron density n and the ratio J/t. Two known limiting cases are n<12, which is a single band Luttinger liquid, and small hole doping ?<<1 for J/t-->0, which is a Nagaoka ferromagnet. Using Lanczos techniques we examine the region between the Nagaoka and Luther-Emery phases for 1>n>12. We find evidences for gapless behavior in both spin and charge channels for J/t<0.3, consistent with Luttinger liquids in both bonding and antibonding bands (i.e., C2S2). This proposal is based on the behavior of spin and charge correlation functions. For example, the hole-hole correlation function that displays hole pairing at larger J/t shows hole-hole repulsion in this region. As a further test, we examined the dependence of the energy on a relative phase shift between bonding and antibonding bands. For J/t<0.3 this is very weak, indicating a lack of pairing between these channels.

  2. Enhanced adsorption and desorption of VOCs vapor on novel micro-mesoporous polymeric adsorbents.

    PubMed

    Wang, Shuangshuang; Zhang, Liang; Long, Chao; Li, Aimin

    2014-08-15

    To enhance adsorption and desorption efficiency of volatile organic compounds from gas streams, we synthesized a series of well-developed micro-mesoporous hypercrosslinked polymeric adsorbents (MM-1, MM-2, and MM-3). The adsorption and desorption performance of dichloromethane and 2-butanone on newly synthesized adsorbents was investigated and compared with commercial micropore-dominated hypercrosslinked polymeric adsorbent (JT-001). The contributions of micropore and mesopore to adsorption and desorption of dichloromethane and 2-butanone on polymeric adsorbents were well elucidated. Consequently, the adsorbent MM-3 had been sorted out with high BET surface area (1606 m(2)/g), large micropore and mesopore volumes (0.562 mL/g and 1.046 mL/g, respectively). The MM-3 exhibited the similar adsorption capacities with JT-001 for dichloromethane and 2-butanone at regions of p/p0<0.2, but had higher adsorption capacities than JT-001 at high relative pressures. The largest adsorption capacities of MM-3 for dichloromethane and 2-butanone at 308 K were 1345.3 mg/g and 853.5 mg/g, respectively, which are about 1.78 and 1.88 times those of JT-001 under the same condition. Furthermore, the MM-3 exhibited higher desorption efficiencies than JT-001, especially for 2-butanone with a higher boiling point. PMID:24910052

  3. Experimental investigation on mixed refrigerant Joule-Thomson cryocooler with flammable and non-flammable refrigerant mixtures

    NASA Astrophysics Data System (ADS)

    Walimbe, N. S.; Narayankhedkar, K. G.; Atrey, M. D.

    2010-10-01

    The mixed refrigerant Joule-Thomson (MR J-T) cryocoolers have a wide application area covering the temperature range from 80 K to 200 K. The significant advantages of the system are simplicity of its design and working reliability with high level performance. The present paper discusses the experimental results of MR J-T cooler with different flammable and non-flammable mixture compositions. The work highlights the use of pressure-enthalpy and temperature-enthalpy diagrams for these mixtures to support the experimental results. A record lowest temperature of 65 K and a cooling capacity of 6 W at 80 K are obtained for a single stage MR J-T system starting at 300 K. Further, using a mixture of minimum flammable refrigerants, temperatures below 100 K is achieved.

  4. Cogeneration Economics 

    E-print Network

    Mongon, A.

    1984-01-01

    announ~u that $ 58 billion'will be .6pent on indu.6~ ~ogen~on equipment and .6~vi~u between 1983 and 2000 ! Some en~y exp~ Me now wo~fL.{.ng on pMje~ on ~ogen~on whi~h onneM the potential no~ ~oUegu and UMVeMiliu to ~edu~e thw en~y ~O.6t.6 by 25 %o...Age indU6:tJLi..a.l efe.ct!ti~y ~OYlJ.>ume.Jt ~ompwu 8 6ea60na.t :time 06 day ~ate.goltiu gltoupe.d into 60Ult :ta.JU..6 peJtiod6 : winte.Jt, 6plting and autumn, 6umme.Jt and the July and Augw.,t peJtiod. The ve.Jty impo!t:ta.nt pltice di6 6e...

  5. Effect of dynamics on the elastic softening of vacancies in Si

    SciTech Connect

    Shirai, Koun; Ishisada, Jun [ISIR, Osaka University, 8-1, Mihogaoka, Ibaraki, Osaka 567-0047 (Japan)

    2014-02-21

    Recently, elastic softening at temperatures below 20 K has been observed in nondoped floating zone silicon. From the experimental analysis, it has been suggested that this softening is caused by an intrinsic vacancy defect through the Jahn-Teller (JT) effect. We have theoretically studied the relations between softening and the vacancies. The ground state of the JT distortion is stiff. However, by considering atomistic dynamical and anharmonic effects, it is found that low-energy excitations exist in the E-mode distortion and that different polarizations of the E-distortion can be easily interchanged. The calculated energy barriers for the reorientation of JT distortions are consistent with other experiments and calculations. This low-lying mode can be the cause of softening in the elastic responses.

  6. The Jahn-Teller effect in the 3pe' Rydberg state of H3: review of experimental and ab initio determinations.

    PubMed

    Jungen, Ch; Jungen, M; Pratt, S T

    2012-11-13

    The dissociative recombination (DR) of H(3)(+) ions with electrons, producing neutral atomic and molecular fragments, is driven primarily by the vibronic Jahn-Teller (JT) interaction between the electronic components of the pe' e(-)-H(3)(+) collision (Rydberg) channel. The JT parameters characterizing this interaction are therefore of great interest as they are required for the theoretical predictions of the DR cross section. In this contribution, we review various determinations of these quantities that have been made previously, based both on spectroscopic studies of 3pe' Rydberg-excited H(3) states, and on the analysis of the corresponding ab initio H(3) Rydberg potential surfaces near the conical intersection (D(3h) symmetry) for n=3-5. The highly correlated theoretical 3pe' potential surfaces of Mistrík et al. are used for a new determination of both the linear and quadratic JT terms. PMID:23028155

  7. Jahn-Teller assisted polaron hopping and associated dielectric response of PrFe0.5Mn0.5O2.95

    NASA Astrophysics Data System (ADS)

    Ganeshraj, C.; Kavita, S.; Mahendiran, R.; Sharma, Neetika; Das, A.; Santhosh, P. N.

    2013-09-01

    The canted G-type antiferromagnet PrFe0.5Mn0.5O2.95 shows an enhanced Jahn-Teller (JT) distortion below 150 K (T*). The resistivity of the grains can be described by variable range hopping between the localized states, and there is a dominant grain boundary contribution to dc resistivity, below T*. Above T*, the total dc resistivity follows small polaron hopping (SPH) conduction. A giant dielectric response is observed, and it can be ascribed to Maxwell-Wagner polarization and SPH mechanism. Despite the low concentration of JT active Mn3+ ions, our result indicates an important role of JT effect on physical properties of PrFe0.5Mn0.5O2.95.

  8. Test-engine and inlet performance of an aircraft used for investigating flight effects on fan noise

    NASA Technical Reports Server (NTRS)

    Golub, R. A.; Preisser, J. S.

    1984-01-01

    As part of the NASA Flight Effects on Fan Noise Program, a Grumman OV-1B Mohawk aircraft was modified to carry a modified and instrumented Pratt & Whitney JT15D-1 turbofan engine. Onboard flight data, together with simultaneously measured farfield acoustic data, comprise a flight data base to which JT15D-1 static and wind-tunnel data are compared. The overall objective is to improve the ability to use ground-based facilities for the prediction of flight inlet radiated noise. This report describes the hardware and presents performance results for the research engine.

  9. 1 Supplementary Derivation of Reduced Poisson For-Below, we show that the least square problem from Equation 5 in the paper can be

    E-print Network

    Popovic, Jovan

    . t(q) = argmin t k1...T j=2,3 1...P k, D (q)^vk,j - vk,j 2 where vk,j = k,jt - k,1t if yk,j / F and yk,1 / F k,jt - k,1q if only yk,1 F k,jq - k,1t if only yk,j F Let (k, j) F0 be the set of edges where neither yk,j nor yk,1 are fixed. Let (k, j) F1 be the set of edges where only yk,1 is fixed. Let

  10. Fluctuating pressures on fan blades of a turbofan engine: Static and wind-tunnel investigations

    NASA Astrophysics Data System (ADS)

    Schoenster, J. A.

    1982-03-01

    To investigate the fan noise generated from turbofan engines, miniature pressure transducers were used to measure the fluctuating pressure on the fan blades of a JT15D engine. Tests were conducted with the engine operating on an outdoor test stand and in a wind tunnel. It was found that a potential flow interaction between the fan blades and six, large support struts in the bypass duct is a dominant noise source in the JT15D engine. Effects of varying fan speed and the forward speed on the blade pressure are also presented.

  11. habitat (Native) 58 

    E-print Network

    James R. Manhart

    2011-08-10

    ? U?2 G?J?2??j?? ?? TGW; Jj?T ?j?;j? G Mj?T? M2???p B;T ??2? ?U cTJJ?T2 G?? l2G??T???2MT2 Rs"P ;GJ GIJ? ?TT? ?JT? ?? BG?I?2?J JW;??I ?U ?;??M;? GJ ldHpv ?U ;T?T2?MT?Tj??p H?WT?? ?;G? ?;T? ?JT? ???MJ?T? ????T2JS ?;T 2TJ?I?J ?U cTJJ?T2 G?? l2G??T???2...

  12. The effect of external magnetic field on the Raman peaks in manganites

    NASA Astrophysics Data System (ADS)

    Sahu, A. K.; Rout, G. C.

    2014-04-01

    We report here a microscopic theoretical model study exhibiting the effect of external magnetic field on the Raman excitation peaks in the CMR manganite system. The Hamiltonian consists of Jahn-Teller (J-T) distortion in eg band, the double exchange interaction and the Heisenberg spin-spin interaction. Further the phonons are coupled to eg band electrons, J-T distorted eg band and the double exchange interaction. The Raman spectral intensity is calculated from the imaginary part of the phonon Green function. The spectra exhibits three peaks besides a very weak high energy peak. The magnetic field effect on these peaks are reported.

  13. Mind Meld Issue 2

    E-print Network

    Multiple Contributors

    1985-01-01

    . of the one outweigh the needs of the many .?. " AdnWr..ai. J amu T. Kbr.k and Cap.taA..n Spoc.k S:taJt TlLek II: The WJr.a.,th 06 Khan S:taJt TlLek III: The S~c.h 60lL Spoc.k e t U!@ ? Fall olLdeJti..ng bt601Una..tion, ple.a.&e .6end. SASE :to: Sandy... .. ---.......... ?? ........ ?? ........................ ?? ........................................ 1 r..-. ......................................................................................................................................................... ,j Here it is -- finally! Mind Meld II has made it into this world. Though we know we...

  14. Local structure of La{sub 1-x}Sr{sub x}CoO{sub 3} determined from EXAFS and neutron PDF studies.

    SciTech Connect

    Sundaram, N.; Jiang, Y.; Anderson, I. E.; Belanger, D. P.; Booth, C. H.; Bridges, F.; Mitchell, J. F.; Proffen, Th.; Zheng, H.; Univ. of California at Santa Cruz; LBNL; LANL

    2009-01-01

    The combined local structure techniques, extended x-ray absorption fine structure and neutron pair distribution function analysis, have been used for temperatures 4 {le} T {le} 330 K to rule out a large Jahn-Teller (JT) distortion of the Co-O bond in La{sub 1-x}Sr{sub x}CoO{sub 3} for a significant fraction of Co sites (x {le} 0.35), indicating few, if any, JT-active, singly occupied e{sub g} Co sites exist.

  15. Analysis of turbofan engine performance deterioration and proposed follow-on tests

    NASA Technical Reports Server (NTRS)

    Sallee, G. P.; Kruckenberg, H. D.; Toomey, E. H.

    1975-01-01

    Data and engine parts on in-service JT3D and JT8D engines were analyzed and documented relative to engine deterioration. It is concluded that the fan-compressor system of these engines contributes to the long term engine deterioration. An engine test and instrumentation plan was formulated for a proposed follow-on program. The goal of this program is to verify the above conclusion and to attempt to identify more precisely which components of the fan-compressor system are at fault.

  16. Structure--properties relationships for manganese perovskites

    SciTech Connect

    Dabrowski, B.; Xiong, X.; Chmaissem, O.; Bukowski, Z.; Jorgensen, J. D.

    1999-10-14

    By combining the results of dc magnetization, ac susceptibility, magnetoresistivity, magnetostriction, and x-ray and neutron powder diffraction data for stoichiometric La{sub 1{minus}x}Sr{sub x}MnO{sub 3} the authors have constructed a phase diagram that describes the magnetic, transport, and structural properties and the relationships among them as a function of composition and temperature. Correlations among physical and structural properties have been observed that are consistent with a competition between ferromagnetism and JT distortion. A metallic state occurs below the Curie temperature when both coherent and incoherent JT distortions are suppressed.

  17. Density-functional studies of the electronic structure of the perovskite oxides: Laââ{sub {ital x}}Ca{sub {ital x}}MnOâ

    Microsoft Academic Search

    S. Satpathy; Z. S. Popovic; F. R. Vukajlovic

    1996-01-01

    Using density-functional methods, we study the electronic structures of the lanthanum-based {open_quote}{open_quote}double-exchange{close_quote}{close_quote} perovskite magnets. Antiferromagnetic insulating solutions are obtained for both the end members, LaMnOâ and CaMnOâ, within the local density approximation (LDA), with the Jahn-Teller (JT) distortion of the oxygen octrahedron taken into account. The JT distortion splits off the Mn(3{ital d}){ital e}{sub {ital g}} bands producing an energy

  18. An improved genetic linkage map for cowpea (Vigna unguiculata L.) Combining AFLP, RFLP,

    E-print Network

    Gepts, Paul

    , biochemical markers, and biological resistance traits J.T. Ouédraogo, B.S. Gowda, M. Jean, T.J. Close, J. Walp.) based on the segregation of various molecular markers and biological resistance traits biological resistance traits, resistance genes, and resistance gene analogs (RGAs) were scored

  19. Photocopy of original drawing showing Wing E (drawing located at ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Photocopy of original drawing showing Wing E (drawing located at NAWS China Lake, Division of Public Works). J.T. STAFFORD-J.H. DAVIES-H.L. GOGERTY: SICK OFFICERS QUARTERS, FLOOR PLAN AND ELEVATIONS - Naval Ordnance Test Station Inyokern, Dispensary, Main Site, Lauritsen Road at McIntyre Street, Ridgecrest, Kern County, CA

  20. Photocopy of original drawing showing Wing B (drawing located at ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Photocopy of original drawing showing Wing B (drawing located at NAWS China Lake, Division of Public Works). J.T. STAFFORD-J.H. DAVIES-H.L. GOGERTY: DISPENSARY, SURGICAL AND OBSTETRICAL, FLOOR PLAN AND ELEVATIONS - Naval Ordnance Test Station Inyokern, Dispensary, Main Site, Lauritsen Road at McIntyre Street, Ridgecrest, Kern County, CA

  1. Comparison of a Private Family Practice and a University Teaching Practice

    ERIC Educational Resources Information Center

    Rudnick, K. Vincent; And Others

    1976-01-01

    When a private family practice in Hamilton, Canada, became a teaching practice of McMaster University, a before-and-after study was conducted to compare characteristics of the patients and the impact of the change on the practice. Conclusion: Such a transplanted private practice is a realistic teaching resource in primary care. (Editor/JT)

  2. Page 1 of 36 Investigation of peatland restoration (grip blocking) techniques to

    E-print Network

    Gauci, Vincent

    Final Report Defra Project SP1202 Contractors: Dr. Sophie Green1 , Dr. Carl Boardman1 , Prof. Andy Baird of Earth and Environmental Sciences The Open University Walton Hall Milton Keynes MK7 6AA e: v.gauci@open.ac.uk Prof. Andy Baird School of Geography University of Leeds Leeds LS2 9JT e: a.j.baird@leeds.ac.uk #12

  3. Modern Chinese-English Dictionary for Students

    E-print Network

    Huang, Chi-Chou

    1968-01-01

    ~;|jf[ elder sister (b) Used for transliteration. ~Hffp Afghanistan ?^E amoeba ~fji U.A.R. ~+SS Argentina ~MEjlS5 Albania ~W2tfUS5 A?geria ~fOffi Arabia ?JtHHSSS^ Arabic numerals ~#T]ZS# aspirin ~J| Oman ~J;bS/E55 Abyssinia ~-j|] a Moslem...

  4. Characteristics of a liquid-helium-free calibration apparatus for cryogenic thermometers

    NASA Astrophysics Data System (ADS)

    Shimazaki, T.

    2013-09-01

    Closed-cycle Joule-Thomson (JT) cryocoolers have been developed at National Metrology Institute of Japan (NMIJ)/National Institute of Advanced Industrial Science and Technology (AIST) with the aim of realizing a liquid-helium-free calibration apparatus for cryogenic thermometers between 0.65 K and 25 K. The latest JT cryocooler at NMIJ/AIST consists of a 3He JT cooling circuit and a pulse tube mechanical refrigerator. The characteristics of the apparatus including a residual gas analysis of the JT cooling circuit are presented in this paper. Currently the initial cool-down is performed using a heat-exchange gas. It normally takes about 30 h to reduce the temperature from room temperature to 5 K at the thermometer comparison block of the apparatus. The correct timing of the removal of the heatexchange gas is important for the efficient operation of the apparatus. Incomplete removal of the heat-exchange gas induces excess heat load on the apparatus and thermal disturbances. Some examples of abrupt temperature bursts are discussed in this paper. Mechanical refrigerators generate cyclic mechanical vibrations, and precision resistance thermometers are usually very sensitive to a mechanical vibration. The measured vibration level of the developed apparatus is reported. The damage to the apparatus due to the magnitude 9.0 earthquake on March 11, 2011, and possible countermeasures in the case of future earthquakes are also discussed.

  5. Dental Topics for Medical Students

    ERIC Educational Resources Information Center

    Lorber, Mortimer

    1976-01-01

    As part of the required Introduction to Clinical Sciences course, second-year students at Georgetown University School of Medicine attend three one-hour lectures on dentistry: restorative dentistry, oral surgery, and various diseases. Contents of the lectures are summarized here. (JT)

  6. Electron Acoustic Waves in Pure Ion Plasmas Francois Anderegg, C. Fred Driscoll, Daniel H.E. Dubin and

    E-print Network

    California at San Diego, University of

    Electron Acoustic Waves in Pure Ion Plasmas Francois Anderegg, C. Fred Driscoll, Daniel H.E. Dubin-0319 Abstract. Electron Acoustic Waves (EAWs) are the low frequency branch of electrostatic plasma waves-Gould wave, EAW PACS: 52.27.Jt, 52.35.Fp, 52.35.Sb INTRODUCTION The near-linear Electron Acoustic Wave (EAW

  7. An Application of Space-Based Gas Mixtures for Joule-Thompson Cryocoolers

    Microsoft Academic Search

    V. T. Arkhipov; O. V. Yevdokimova; M. P. Lobko; V. V. Yakuba

    1999-01-01

    An extension of deepspace research, specifically, the work done on Alpha program, will inevitably require new and different cryostating systems. The primary differences will be in the areas of cooling power and temperature. One variant which can be used with J-T cryocoolers is the application of diverse gas mixtures which can work over a large temperature range. We have found

  8. Pilot-Aided Channel Estimation in WCDMA on a Radio-over-Fibre Channel Gholamreza Baghersalimi, Timothy O'Farrell, Vas Postoyalko

    E-print Network

    Haddadi, Hamed

    capacity, centralised upgrading and adaptation, higher reliability and lower maintenance costs, support and Electrical Engineering, University of Leeds, Woodhouse Lane, Leeds, UK, LS2 9JT Email:eengba@leeds.ac.uk, tof carries are distributed by means of optical components and techniques. Better coverage and increased

  9. Gels formed from amino-acid derivatives, their novel rheology as probed by bulk and particle tracking rheological methods

    E-print Network

    Frith, W. J.; Donald, A. M.; Adams, D. J.; Aufderhorst-Roberts, A.

    2014-09-28

    history: a b s t r a c t We discuss the use of dyn Journal of Non-Newt journal homepage: ht tp : / /weir novel rheology as probed ethods t-Roberts d , Cambridge CB3 0HE, UK n Street, Liverpool L69 7ZD, UK , Leeds LS2 9JT, UK ic light scattering based...

  10. Primary Care, Ambulatory Care, and Family Medicine: Overlapping But Not Synonymous

    ERIC Educational Resources Information Center

    Reynolds, Robert E.

    1975-01-01

    Defines and depicts graphically the relationships between primary, secondary, and tertiary care functions (from least to most intensified phases of medical care); ambulatory care (care of sick or well people not confined to bed); and family medicine (an emerging medical discipline focusing on complete and longterm care of the family). (JT)

  11. letters to nature 470 NATURE |VOL 408 |23 NOVEMBER 2000 |www.nature.com

    E-print Network

    Horvitz, H. Robert

    by the Japan Society for the Promotion of Science (E.H.), by the Ministry of Education, Science, and Culture of Japan, and by the Japan Science and Technology Corporation (J.T.). Correspondence and requests-protein-coupled receptors (for example, 5-HT1, 5-HT2, 5-HT4 to 5-HT7), which mediate `slow' modulatory responses through

  12. Multiple cis Regulatory Elements for Maximal Expression of the Cauliflower Mosaic Virus 35S Promoter in Transgenic Plants

    Microsoft Academic Search

    Rong-Xiang Fang; Ferenc Nagy; Shanthi Sivasubramaniam; Nam-Hai Chua

    1989-01-01

    The 35S promoter is a major promoter of the cauliflower mosaic virus that infects crucifers. This promoter is still active when excised from cauliflower mosaic virus and integrated into the nuclear genome of transgenic tobacco. Previous work has shown that the -343 to -46 upstream fragment is responsible for the majority of the 35S promoter strength (Odell, J.T., Nagy, F.,

  13. Application of parallel heat exchangers in helium refrigerators for mitigating effects of pulsed load from fusion devices

    Microsoft Academic Search

    Rohan Dutta; Parthasarathi Ghosh; Kanchan Chowdhury

    2011-01-01

    Tokamaks and Stellarators generate heat loads that are pulsating in nature. The helium refrigerators employed for cooling these fusion devices are, however, designed for a steady heat load. Unless they are appropriately adapted and controlled, process parameters under pulsed load may vary to such an extent which may lead of plant instability. In this paper, performance of a J–T stage

  14. External Degree Programs: Alternative Delivery Systems for Higher Education

    ERIC Educational Resources Information Center

    Perlman, Daniel H.

    1975-01-01

    Analyzes the social and economic factors which in a two- or three-year period moved the education of older students, awarding credit by examination, off-campus study, and nonresidential degree programs from a nether world of low status and funding. Notes positive benefits but warns against uncritical acceptance of this latest vogue. (JT)

  15. The Fallacies of Numerical Goals

    ERIC Educational Resources Information Center

    Lester, Richard A.

    1976-01-01

    Discusses the problems inherent in the federal government's statistical method of determining and enforcing goals for the hiring and composition of faculty of colleges and universities with federal contracts. Stress is on the need for revision of the program to correct flaws and eliminate red tape. (Editor/JT)

  16. FIELD MEASUREMENT OF DISSOLVED OXYGEN: A COMPARISON OF METHODS: JOURNAL ARTICLE

    EPA Science Inventory

    NRMRL-ADA- 00160 Wilkin*, R.T., McNeil*, M.S., Adair*, C.J., and Wilson*, J.T. Field Measurement of Dissolved Oxygen: A Comparison of Methods. Ground Water Monitoring and Remediation (Fall):124-132 (2001). EPA/600/J-01/403. The abili...

  17. HR’s role in implementing JTI’s global ERP system: How HR’s focus on change management was key to a successful ERP project

    Microsoft Academic Search

    Khalil Cotran; Ursula Buchmeiser; Jean-Luc Seguin; BillPelster

    2005-01-01

    In 1999, JT International was comprised of over 100 disparate companies. A global ERP (Enterprise Resource Planning) system was vital to transform the company into a modern multinational. Find out how HR and the change management team focused on the “people” side of change to ensure the four-year project came in on time and on budget.

  18. DMigs-pa-brtag-pahi-hgrel-pa (Alambana Pariksha Vritti)

    E-print Network

    Namgyal Institute of Tibetology

    1980-01-01

    ! . .,11}.....Pi? jJ l1\\-SI! ~ • IlJ ~ 01' n ~ ~ n ~ JJIi 1;, 6lJ ~., (lJ' ~ JlII ~ ...91 J! It) .91{ .2 .; Jt - . n n -:!! t~ 11 11 .i! ~ . • • L!( (,~ 2!tl 1J -" .2 P >~n.ri ~ J1~ £, li, i.! '.$lIt _ .. - ~, -' ,~"\\., -" ............ V! ~ JPI...

  19. Salt tectonics driven by differential sediment loading: Stability analysis and finite element experiments

    E-print Network

    Beaumont, Christopher

    1 Salt tectonics driven by differential sediment loading: Stability analysis and finite element University of Leeds Leeds LS2 9JT United Kingdom e-mail: lykke@earth.leeds.ac.uk Short running title: Salt salt layer drives salt deformation and has a significant impact on the structural evolution

  20. Numerical Modeling of Salt Tectonics on Passive Continental Margins: Preliminary Assessment of the Effects of Sediment Loading,

    E-print Network

    Beaumont, Christopher

    Numerical Modeling of Salt Tectonics on Passive Continental Margins: Preliminary Assessment Sciences The University of Leeds LS2 9JT Leeds United Kingdom Abstract Salt tectonics in passive model of frictional-plastic sedimentary overburden overlying a linear viscous salt layer. We present

  1. Habits, Fears, and Desires of the Genus Graduate Student

    ERIC Educational Resources Information Center

    Taylor, Anne Robinson

    1976-01-01

    Based on interviews with graduate students in English, biochemistry, and psychology the author discusses common characteristics of graduate students (lifelong observers with faith in authority and strong emotional attachment to a minute field of inquiry) and notes implications for their teaching and their contributions to society. (JT)

  2. Amending the Amendments

    ERIC Educational Resources Information Center

    McNamara, William

    1976-01-01

    Reviews activity in Congress, federal agencies, and higher education associations as legislation to extend and improve the 1972 Higher Education Amendments is being fashioned. Issues include a public vs. private debate regarding use of the Basic Opportunity Grant program (BOG) to foster access as opposed to choice among institutions. (JT)

  3. Constitutional Law: Charitable Tax Exemptions as State Action

    ERIC Educational Resources Information Center

    Walsh, Kate Monica

    1975-01-01

    The doctrine of "state action" as a prerequisite to the application of federal civil rights laws is reviewed with reference to Jackson v. Statler Foundation, which the author sees as having adverse effects on the workings of charitable institutions, blocking innovation and experimentation through philanthropic grants from small foundations. (JT)

  4. Medical Exploring: A Program for Early Exposure to Health Careers

    ERIC Educational Resources Information Center

    Wachtel, Thomas; And Others

    1976-01-01

    "Medical Exploring," a program for young men and women interested in health careers, is the largest and one of the fastest growing of the career special interest programs of the Boy Scouts of America's Exploring Division. History, organization, and program of the group are described and discussed. (JT)

  5. Detunable Transverse Electromagnetic (TEM) Volume Coil for High-Field NMR

    E-print Network

    Duong, Timothy Q.

    Detunable Transverse Electromagnetic (TEM) Volume Coil for High-Field NMR J.T. Vaughan,* G. Adriany the utility of high magnetic fields in functional, anatomical, and metabolic imaging of the hu- man brain (1 has not been available for high-field studies, especially for those at 4T and above. For brain imaging

  6. Two-stage, low noise advanced technology fan. 5: Acoustic final report

    NASA Technical Reports Server (NTRS)

    Sofrin, T. G.; Riloff, N., Jr.

    1975-01-01

    The NASA Q2S(quiet two-stage) fan is a 0.836m (32.9 in.) diameter model of the STF 433 engine fan, selected in a 1972 study for an Advanced Technology Transport (ATT) airplane. Noise-control features include: low tip speed, moderate stage pressure rise, large blade-vane spacings, no inlet guide vanes, and optimum blade and vane numbers. Tests were run on the baseline Q2S fan with standard inlet and discharge ducts. Further tests were made of a translating centerbody sonic inlet device and treated discharge ducts. Results were scaled to JT8D and JT3D engine fan size for comparison with current two-stage fans, and were also scaled to STF 433 fan size to compare calculated ATT flyover noise with FAR 36 limits. Baseline Q2S results scaled to JT8D and JT3D engine fan sizes showed substantial noise reductions. Calculated unsuppressed baseline ATT flyovers averaged about 2.5 EPNdB below FAR 36 limits. Using measured sonic inlet results, scaled baseline Q2S fan results, and calculated attenuations for a 1975 technology duct liner, projected flyover noise calculations for the ATT averaged about FAR 36 limits minus 10 EPNdB. Advances in suppression technology required to meet the 1985 goal of FAR 36 limits minus 20 EPNdB are discussed.

  7. ?-Catenin-driven cancers require a YAP1 transcriptional complex for survival and tumorigenesis*

    Cancer.gov

    Rosenbluh J, Nijhawan D, Cox AG, Li X, Neal JT, Schafer EJ, Zack TI, Wang X, Tsherniak A, Schinzel AC, Shao DD, Schumacher SE, Weir BA, Vazquez F, Cowley GS, Root DE, Mesirov JP, Beroukhim R, Kuo CJ, Goessling W, Hahn WC.

  8. ?-Catenin-driven cancers require a YAP1 transcriptional complex for survival and tumorigenesis* | Office of Cancer Genomics

    Cancer.gov

    Rosenbluh J, Nijhawan D, Cox AG, Li X, Neal JT, Schafer EJ, Zack TI, Wang X, Tsherniak A, Schinzel AC, Shao DD, Schumacher SE, Weir BA, Vazquez F, Cowley GS, Root DE, Mesirov JP, Beroukhim R, Kuo CJ, Goessling W, Hahn WC.

  9. The Reverend Thomas Jefferson Bowen: An Introductory Background to His Linguistic Works, 1850-1856

    ERIC Educational Resources Information Center

    Awoniyi, Timothy A.

    1974-01-01

    A historical narrative background for the linguistic works of Thomas Jefferson Bowen, an American missionary who was the first non-Nigerian to publish a grammar of Yoruba (1858). The author points up a need for further scholarly review of Bowen's pioneering work and contribution to Yoruba studies. (JT)

  10. Journal of Mathematical Psychology 56 (2012) 341355 Contents lists available at SciVerse ScienceDirect

    E-print Network

    Townsend, James T.

    2012-01-01

    for workload capacity analysis Joseph W. Houpt , James T. Townsend Department of Psychological and Brain@indiana.edu (J.W. Houpt), jtownsen@indiana.edu (J.T. Townsend). Furthermore, it relies on the assumption the workload. The capacity coefficient (Townsend & Nozawa, 1995; Townsend & Wenger, 2004) is a measure

  11. Journal of Mathematical Psychology 56 (2012) 476494 Contents lists available at SciVerse ScienceDirect

    E-print Network

    Townsend, James T.

    2012-01-01

    : jtownsen@indiana.edu (J.T. Townsend), joseph.houpt@wright.edu (J.W. Houpt), nsilbert@umd.edu (N.H. Silbert , Joseph W. Houptb, , Noah H. Silbertc a Department of Psychological and Brain Sciences, Indiana University Recognition Theory (GRT; Ashby & Townsend, 1986) is a multidimensional theory of classification. Originally

  12. Electron-phonon coupling in the self-consistent Born approximation of the t-J model

    NASA Astrophysics Data System (ADS)

    Gunnarsson, O.; Rösch, O.

    2006-05-01

    We study an undoped t-J model with electron-phonon interaction using the self-consistent Born approximation (SCBA). By neglecting vertex corrections, the SCBA solves a boson-holon model, where a holon couples to phonons and magnons. Comparison with exact diagonalization results for the t-J model suggests that the SCBA describes the electron-phonon interaction fairly accurately over a substantial range of J/t values. Exact diagonalization of the boson-holon model shows that the deviations are mainly due to the neglect of vertex corrections for small J/t and due to the replacement of the t-J model by the boson-holon model for large J/t . For typical values of J/t , the electron-phonon part ?ep of the electron self-energy has comparable contributions from the second-order diagram in the electron-phonon interaction and a phonon-induced change of magnon diagrams. A very simple approximation to ?ep gives a rather accurate effective mass. Using this approximation, we study the factors influencing the electron-phonon interaction. Typically, we find that the magnons nominally have a stronger coupling to the holon than the phonons. The phonons, nevertheless, drive the formation of small polarons (self-localization) due to important differences between the character of the phonon and magnon couplings.

  13. A Seminar in Legal Aspects of Minority Economic Development

    ERIC Educational Resources Information Center

    Donegan, Charles Edward

    1975-01-01

    The 2-hour elective seminar described here was designed to prepare second- and third-year law students to perform the role of legal counselor to potential and existing minority businessmen in forming or expanding business enterprises. Seminar outline and notes on materials, reading, research assignments, and resource persons are included. (JT)

  14. Inside the Term-Paper Factories

    ERIC Educational Resources Information Center

    Anderson, B. Robert

    1976-01-01

    Describes the activities of companies which write term papers for profit or prepare research that goes into term papers for college students. Notes efforts of universities and the government to control such enterprises and their present legal refuge as "research" organizations. (JT)

  15. Evaluating Dynamic Analysis Techniques for Program

    E-print Network

    Zaidman, Andy

    . ir. J.T. Fokkema, voorzitter van het College voor Promoties, in het openbaar te verdedigen op dinsdag goes to my promotor, Arie van Deursen, whose pa- tience and constructiveness enabled me to write! Thanks also to the 34 colleagues and students who participated in my final experiment, which in total

  16. Model-Driven Evolution of Software Architectures

    E-print Network

    Graaf, Bas

    prof.dr.ir. J.T. Fokkema, voorzitter van het College voor Promoties, in het openbaar te verdedigen op. Like I feel now. One big difference is that during my PhD-career I encoun- tered many people, here it goes. If crossing the finish line has to be attributed to one person, than that person has got

  17. Provost's Task Force on Promotion and Tenure

    E-print Network

    Holland, Jeffrey

    of Computer Graphics Technology & Professor, Computer Graphics Technology KAREN SCHMID Vice Chancellor-Tenure Review MARVIN SARAPIN Chair Head, Department of Computer Graphics Technology & Professor, Computer, Educational Studies MARK J.T. SMITH Dean, Graduate School & Birck Professor, Electrical and Computer

  18. 34 AEROSPACE AMERICA/MAY 2011 Copyright 2011 by the American Institute of Aeronautics and Astronautics Long gone are the days when weekend

    E-print Network

    to the skies, its four Pratt & Whitney JT3C jet engines belching soot and smoke out the rear as the airliner; AEROSPACE AMERICA/MAY 2011 35 formed as a result of jet engine water vapor emissions often spread out or water vapor," says Jay Dryer, director of NASA's Funda by Jim Banke Public Affairs writer, NASA

  19. Carnegie Mellon Multiperiod Blend Scheduling Problem

    E-print Network

    Grossmann, Ignacio E.

    of the delivery nodes are the tanks feeding the CDU or the tanks delivering to final customers #12;4 CarnegieJjQqSS Y BB qjt B qjt jt ,,'1 TtEjjxFFxF tjj U jjtjjtjj L jj ,)'(''''' GDP Formulation (Property Balance

  20. rsbl.royalsocietypublishing.org Cite this article: Vale PF, Choisy M, Little TJ.

    E-print Network

    Choisy, Marc

    , France 3 Oxford University Clinical Research Unit, Hanoi, Vietnam Q1 4 Centre for Immunity, Infection, Ashworth Labs, West Mains Road, Edinburgh EH9 3JT, UK The environmental conditions experienced by hosts­parasite model system, the fresh- water planktonic crustacean Daphnia magna and the obligate-killing bacterial

  1. Learning Under Siege on the West Bank

    ERIC Educational Resources Information Center

    Miller, Judith

    1975-01-01

    Birzeit College, the only secular institution of higher education in the Israeli-occupied territories, continues to operate with 500 Palestinians attending classes on the West Bank of the Jordan River Valley even though its president, expelled for alleged subversive activities, continues to run the college from Beirut. (JT)

  2. Polarons in Jahn-Teller Crystals: Intrinsic Difference between eg and t2g Electrons

    E-print Network

    Takada, Yasutami

    Polarons in Jahn-Teller Crystals: Intrinsic Difference between eg and t2g Electrons Takada Group subsequent to a previous one of our group for the Ee polarons [2], we have made a comparative study of the polaronic effective mass m* between the Ee and the Tt JT polarons. A comparison with the conventional

  3. Published in IET Communications Received on 7th August 2008

    E-print Network

    Lim, Jong-Tae

    .1049/iet-com.2009.0130 ISSN 1751-8628 Fair scheduling with rate control for IEEE 802.16 broadband wireless networks J.-H. Jeon J.-T. Lim Department of Electrical Engineering and Computer Science, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong Yuseong-gu Daejeon 305-701, Korea E-mail: jtlim

  4. National Education Trust Fund

    ERIC Educational Resources Information Center

    Shapp, Milton J.

    1975-01-01

    A proposal from the governor of Pennsylvania for financing all levels of education through a National Education Trust Fund (NETF) that would operate as the present Federal Highway Trust Fund does on a revolving, self-liquidating basis with the cost of an individual's education repaid through a progressive education tax on income. (JT)

  5. Dynamics of Abelian Higgs vortices in the near Bogomolny regime

    Microsoft Academic Search

    D. Stuart

    1994-01-01

    The aim of this paper is to give an analytical discussion of the dynamics of the Abelian Higgs multi-vortices whose existence was proved by Taubes ([JT82]). For a particular value of a parameter of the theory, ?, called the Higgs self-coupling constant, there is no force between two vortices and there exist static configurations corresponding to vortices centred at any

  6. INHIBITION OF AROMATASE CYTOCHROME P-450 (ESTROGEN SYNTHETASE) BY DERIVATIVES OF ALPHA-NAPHTHOFLAVONE

    EPA Science Inventory

    alpha-Naphthoflavone (ANF; 7,8-benzoflavone) is a potent competitive inhibitor of human aromatase cytochrome P-450 (J.T. Kellis, Jr. and L.E. Vickery, Science 225, 1032 (1984)). The authors have further investigated inhibition of aromatase by several derivatives of ANF. Using hum...

  7. Hard Times for Academic R & D

    ERIC Educational Resources Information Center

    Miller, Judith

    1975-01-01

    Causes and effects are examined for recent cuts in the budgets of the Office of Education's Fund for the Improvement of Postsecondary Education (FIPSE) and the National Institute of Education (NIE). Through interviews with agency executives the author finds new priority placed on selling themselves and their products to Congress. (JT)

  8. Variation and polymorphism in helminth parasites R. M. MAIZELS"* and A. KURNIAWAN-ATMADJA#

    E-print Network

    Maizels, Rick

    -ATMADJA# " Institute of Cell, Animal and Population Biology, University of Edinburgh, West Mains Road, Edinburgh EH9 3JT, UK # Department of Parasitology, Faculty of Medicine, University of Indonesia, Salemba Raya 6, Jakarta 10430, Indonesia SUMMARY There are strong biological, evolutionary and immunological arguments

  9. Procedural Aspects of the Age Discrimination in Employment Act of 1967

    ERIC Educational Resources Information Center

    Donahoe, Thomas P.

    1975-01-01

    A number of cases are reviewed in this discussion of procedural aspects of the Age Discrimination in Employment Act of 1967. Topics include prerequisites to suit, procedural obstacles encountered by litigants, availability of state remedies, class actions, inadequate attempts to achieve voluntary compliance, and willful violations. (JT)

  10. Age Discrimination in Campus Employment

    ERIC Educational Resources Information Center

    Haslam, C. L.

    1975-01-01

    This analysis of the Age Discrimination in Employment Act of 1967 (ADEA) traces the issues that have emerged in litigation and summarizes the developing law, showing the implications in the university context and suggesting rules of thumb for accommodating the Act with the valid educational demands of the affected institutions. (JT)

  11. Age Discrimination in Employment: Available Federal Relief

    ERIC Educational Resources Information Center

    Charme, Stephen M.

    1975-01-01

    The Age Discrimination in Employment Act of 1967 (ADEA) was enacted to combat the denial of equal employment opportunity based on age. This article discusses the major court decisions interpreting the ADEA and makes various suggestions for improving its effectiveness. (Editor/JT)

  12. Employment Discrimination--Age Discrimination in Employment Act of 1967--Bona Fide Occupational Qualification--Hodgson v. Greyhound Lines, Inc.

    ERIC Educational Resources Information Center

    Champion, Susan Elizabeth

    1975-01-01

    Examines the circuit court's decision in favor of Greyhound in a suit alleging that the company's refusal to accept applications for bus driver from persons under 35 violated the Age Discrimination in Employment Act (ADEA). Submits that the decision frustrates congressional intent by permitting arbitrary and unreasonable age discrimination. (JT)

  13. Extended region of nodulation genes in Rhizobium meliloti 1021. I. Phenotypes of Tn5 insertion mutants

    SciTech Connect

    Swanson, J.A.; Tu, J.K.; Ogawa, J.; Sanga, R.; Fisher, R.F.; Long, S.R.

    1987-10-01

    Rhizobium meliloti Nod/sup -/ mutant WL131, a derivative of wild-type strain 102F51, was complemented by a clone bank of wild-type R. meliloti 1021 DNA, and clone pRmJT5 was recovered. Transfer of pRmJT5 conferred alfalfa nodulation on other Rhizobium species, indicating a role in host range determination for pRmJT5. Mutagenesis of pRmJT5 revealed several segments in which transposon insertion causes delay in nodulation, and/or marked reduction of the number of nodules formed on host alfalfa plants. The set of mutants indicated five regions in which nod genes are located; one mutant, nod-216, is located in a region not previously reported to encode a nodulation gene. Other mutant phenotypes correlated with the positions of open reading frames for nodH, nodF and nodE, and with a 2.2-kb EcoRI fragment. A mutant in nodG had no altered phenotype in this strain. One nodulation mutant was shown to be a large deletion of the common nod gene region. The authors present a discussion comparing the various studies made on this extended nod gene region.

  14. Education for Becoming: Two Field Programs at Antioch

    ERIC Educational Resources Information Center

    Kelly, Michael; Prier, Linda

    1974-01-01

    Based on the premise that therapy is a way of learning, two Field Centers were developed: (1) a small group in New Mexico who studied geology, botany, wilderness survival skills and themselves, the latter using group dream study methods and (2) a group in Switzerland to study Jungian psychology including individual analysis. (JT)

  15. School Learning and Adjustment: Interdisciplinary Training for Pediatricians

    ERIC Educational Resources Information Center

    Rockowitz, Ruth J.; Stebbins, Winifred

    1975-01-01

    Describes and evaluates the School Health Programs of the University of Rochester School of Medicine and Dentistry's pediatric training: first-year lectures, second-year electives, clinical consultation for house officers, and a year-long experience as a local school consulting pediatrician for associate residents and fellows. (JT)

  16. A highly efficient 100 L\\/HR class helium liquefier system

    Microsoft Academic Search

    Thomas Ankermann; Roberto Than; Hank Valcour

    1994-01-01

    A new helium liquefier system has been designed and built to provide over 100 liters per hour with a highly efficient process cycle. The modified Claude-cycle utilizes four reciprocating piston expansion engines configured in series, with the lowest temperature engine acting as a wet expander (replacing the usual JT valve). Operation of the system is highly flexible, permitting the use

  17. Intraoccupational Veterinary Specialties: Career Trends and Contingencies Among Students and Practitioners

    ERIC Educational Resources Information Center

    Snizek William E.; Bryant, Clifton D.

    1975-01-01

    A study to identify factors affecting individuals' decisions to pursue small- or large-animal veterinary practice showed that area of childhood residence, perceived (but not actual) income differentials, job travel demands, and perceived professional image and prestige affect the increasing shift from large- to small- animal practice. (JT)

  18. *Corresponding author. Tel.: #1-919-515-7808; fax: #1-919-515-7802.

    E-print Network

    Aneja, Viney P.

    ammonia emissions from anaerobic lagoons V.P. Aneja*, B. Bunton, J.T. Walker, B.P Malik Department Ammonia-nitrogen #ux (NH -N"(14/17)NH ) was determined from six anaerobic swine waste storage and treat ), nitric acid (HNO ), and hydrochloric acid (HCl) to form ammonium sulfate, ammonium nitrate, or ammonium

  19. G. Vlad et al. THEORY OF FUSION PLASMAS -Varenna, Italy, 28/8-1/9, 2006 1 Interaction of fast particles and

    E-print Network

    Vlad, Gregorio

    G. Vlad et al. THEORY OF FUSION PLASMAS - Varenna, Italy, 28/8-1/9, 2006 1 Interaction of fast. Shinohara, M. Ishikawa and M. Takechi (JT-60U); M. Schneider (CRONOS codes) #12;G. Vlad et al. THEORY et al. THEORY OF FUSION PLASMAS - Varenna, Italy, 28/8-1/9, 2006 3 Introduction - 1 · Next generation

  20. Warren Wilson Students: "We Helped Build This Place"

    ERIC Educational Resources Information Center

    Curtis, Wendell

    1975-01-01

    Students at Warren Wilson College, North Carolina, work 15 hours a week at an on-campus job for room and board, cutting the cost of education for both the students and the school. Various characteristics and advantages of the mandatory work program, in operation since 1894, are described. (JT)

  1. An ancient immunity gene duplication in Daphnia magna: RNA expression and sequence analysis of two nitric oxide synthase genes

    E-print Network

    Obbard, Darren

    nitric oxide synthase genes Pierrick Labbe´ *, Seanna J. McTaggart, Tom J. Little University of Edinburgh, Edinburgh EH9 3JT, UK 1. Introduction Nitric oxide (NO) is a highly reactive free radical gas produced by the conversion of L-arginine into L-citrulline by nitric oxide synthase (NOS). Most of what is known about

  2. HOW TO PROVIDE AUTOMATIC FIRE PROTECTION FOR YOUR BUILDING.

    ERIC Educational Resources Information Center

    Honeywell, Inc., Minneapolis, Minn.

    THE ADVANTAGES OF PROMPT FIRE DETECTION IS DISCUSSED WITH RESPECT TO THE NATURE AND COST OF FIRES. EQUIPMENT IS DESCRIBED, AND DIAGRAMS OF INSTALLATIONS OF DETECTION AND ALARM SYSTEMS ARE GIVEN FOR SCHOOLS, HOSPITALS, COMMERICAL BUILDINGS, INDUSTRIAL PLANTS, AND CAMPUSES. (JT)

  3. Conglobation in the pill bug, Armadillidium vulgare, as a water conservation mechanism

    E-print Network

    Ahmad, Sajjad

    Conglobation in the pill bug, Armadillidium vulgare, as a water conservation mechanism Jacob T this paper as: Smigel JT, Gibbs AG. 2008. Conglobation in the pill bug, Armadillidium vulgare, as a water conservation mechanism. 9pp. Journal of Insect Science 8:44, available online: insectscience.org/8.44 Journal

  4. Cryocoolers for Space

    NASA Technical Reports Server (NTRS)

    Castles, Stephen

    2000-01-01

    This paper presents Cryocoolers for Space in viewgraph form. The topics include: 1) U.S. Cryocoolers for 4 to 6 Kelvin; 2) Turbo Brayton Cryocooler-Features; 3) HST/NICMOS (Hubble Space Telescope/Near Infrared Camera and Multiobject Spectrometer) 75 Kelvin Cryocooler; 4) Turbo-Brayton Cryocooler-NGST Design; and 5) Two-stage Sorption J-T Cryocooler.

  5. SOLVING CONVECTION AND CONVECTION REACTION PROBLEMS USING THE M.O.L.

    E-print Network

    Utah, University of

    Centre for CFD and School of Computer Studies, The University of Leeds, Leeds LS2 9JT, UK. Abstract is considered. The components of a prototype software package, SPRINT2D, are unstructured mesh finite volume or tetrahedral meshes. One such method, that of Berzins and Ware [5], will be described briefly in Section 2

  6. RELIABLE FINITE VOLUME METHODS FOR NAVIER STOKES EQUATIONS. M. Berzins and J.M. Ware.

    E-print Network

    Utah, University of

    . The use of adaptive mesh spatial discretisation methods, coupled spatial and temporal error control for the Development of CFD and School of Computer Studies, The University of Leeds, Leeds LS2 9JT, UK. SUMMARY solution of time-dependent Navier Stokes problems. This paper describes the unstructured triangular mesh

  7. Hoods for Science Laboratories.

    ERIC Educational Resources Information Center

    Horowitz, Harold; and others

    Detailed discussions are presented dealing with the selection and design of fume hoods for science laboratories. Areas covered include--(1) air flow design, (2) materials properties, (3) location in the laboratory, (4) testing and adjustment, (5) exhaust systems, and (6) hazards of fume discharges. (JT)

  8. A unified model of species immigration, extinction and abundance on islands

    E-print Network

    Harmon, Luke

    , LS2 9JT, UK, 2 Division of Biology, Imperial College London, Silwood Park Campus, Ascot, Berkshire land bridge origin (high initial diversity). We extend the model to study the effects of clustered equilibrium, immigration, island biogeog- raphy, land bridge island, neutral theory, volcanic island

  9. LETTER A global quantitative synthesis of local and landscape effects on wild bee pollinators in agroecosystems

    E-print Network

    Danforth, Bryan Nicholas

    and in land- scapes comprising more high-quality habitats; bee richness on conventional fields with low diversity bene- fited most from high-quality surrounding land cover. Landscape configuration effects were Biology, University of Leeds, Leeds, LS2 9JT, UK 10 NCB-Naturalis, postbus 9517, 2300 RA, Leiden

  10. Biogeosciences, 9, 54075430, 2012 www.biogeosciences.net/9/5407/2012/

    E-print Network

    Malhi, Yadvinder

    of Geography, Woodhouse Lane, LS9 2JT, Leeds, UK 2CNEN-IPEN-Lab., Quimica Atmosferica, Av. Prof. Lineu Prestes- lation and economic growth, changes in land use practices and a changing atmospheric environment data. Alternative methods for the estimation of the continental- scale net land to atmosphere CO2 flux

  11. 5, 40714105, 2008 Carbon fluxes in

    E-print Network

    Paris-Sud XI, Université de

    Paulo, Brasil 15 Earth and Biosphere Institute, School of Geography, University of Leeds, LS2 9JT, UK This study reports carbon and water fluxes between the land surface and atmosphere in eleven different- etation types (or land cover) (open savannas, woodlands, croplands and grasslands). Given the shortness

  12. Patterns of beta diversity in Europe: the role of climate, land cover and distance

    E-print Network

    Storch, David

    ORIGINAL ARTICLE Patterns of beta diversity in Europe: the role of climate, land cover and distance and Comparative Biology, University of Leeds, Leeds LS2 9JT, UK, 5 Finnish Environment Institute, Natural, land cover or geographic distance and how the independent effects of these variables depend

  13. What is a forest? On the vagueness of certain geographic concepts

    E-print Network

    Leeds, University of

    of Computing, University of Leeds, Leeds LS2 9JT, UK brandon@comp.leeds.ac.uk February 21, 2002 Abstract are taken to give precise de#12;nitions. For example, in the guide book to the Ordnance Survey's Land concepts is rele- vant to many practical problems that involve determining and allocating land types

  14. Geosci. Model Dev., 7, 711723, 2014 www.geosci-model-dev.net/7/711/2014/

    E-print Network

    Malhi, Yadvinder

    Pesquisas da Amazônia, 69060-001 Manaus, Brazil 3School of Geography, University of Leeds, Leeds LS2 9JT, UK 2014 ­ Accepted: 19 March 2014 ­ Published: 6 May 2014 Abstract. Modern land surface model simulations are widely used hydraulic sub-models in land surface models. This has been possible through interpolating

  15. 5, 13791419, 2008 Peatlands and the

    E-print Network

    Paris-Sud XI, Université de

    , UK 5 School of Geography, University of Leeds, Leeds, LS2 9JT, UK 1379 #12;BGD 5, 1379­1419, 2008 peatlands cover only 3% of the Earth's land surface, boreal and subarctic peatlands store about 15 in a new generation of15 earth system models. 1 Introduction Despite covering only 3% of the Earth's land

  16. Originally published 14 July 2011; corrected 11 August 2011 www.sciencemag.org/cgi/content/full/science.1201609/DC1

    E-print Network

    Jackson, Robert B.

    , Canadian Forest Service, Victoria, BC, V8Z 1M5, Canada 7 School of Geography, University of Leeds, LS2 9JT National Laboratory, Oak Ridge, TN 37831, USA #12;2 Methods and Data Definitions of land categories Forest- The definition of forest varies slightly from country to country, but generally follows the FAO definition: Land

  17. Atmos. Chem. Phys., 12, 35113526, 2012 www.atmos-chem-phys.net/12/3511/2012/

    E-print Network

    Meskhidze, Nicholas

    of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK 2National Center for Atmospheric Research from the VAMOS (Variability of the American Monsoon Systems) Ocean-Cloud-Atmosphere-Land Study Regional in particular. The VAMOS (Variability of the American Monsoon Sys- tems) Ocean-Cloud-Atmosphere-Land Study

  18. Mapping socio-economic scenarios of land cover change: A GIS method to enable ecosystem service modelling

    E-print Network

    Vermont, University of

    Mapping socio-economic scenarios of land cover change: A GIS method to enable ecosystem service, Chuo Kikuu, Morogoro, Tanzania e School of Geography, University of Leeds, Leeds LS2 9JT, United of York, Heslington, York YO10 5DD, United Kingdom i Flamingo Land Ltd., Kirby Misperton, Malton, North

  19. Confronting model predictions of carbon fluxes with measurements of Amazon forests subjected to experimental

    E-print Network

    Malhi, Yadvinder

    , Leeds, LS2 9JT, UK; 3 Environmental Change Institute, School of Geography and the Environment change. Here, carbon (C) flux predictions of five terrestrial biosphere models (Community Land Model 2.6.4 (IBIS), Joint UK Land Environment Simulator version 2.1 (JULES) and Simple Biosphere model

  20. Biogeosciences, 6, 18831902, 2009 www.biogeosciences.net/6/1883/2009/

    E-print Network

    Malhi, Yadvinder

    of Leeds, LS2 9JT, England, UK 4Universidade Federal de Par´a, Bel´em, Brazil 5Universidad Nacional San, we map and explore the land- scape context of several major RAINFOR plot clusters us- ing Landsat ETM-dominated forest, palm forest, Heliconia monodom- inant vegetation, swamp forest, disturbed forests and land

  1. Peleased on receipt ;.ut;intended f o r use

    E-print Network

    ?JT3WRS#R 1 Mailed December 22, 1928 By Charles Fitzhu& Tallnan, Authority on Meteorology WIBX "X SUP at any other time of the year, The distance of our planet on that day from the luminary that keeps us from the earth, and our planet as a Thole gets about 7 per cent. m r e aolar heat than at aphelion

  2. Directing spatial attention in mental representations: Interactions between attentional orienting and working memory load

    E-print Network

    and working memory load J. Lepsien1 , I.C. Griffin1 , J.T. Devlin1,2 & A.C. Nobre1 1 Department and retrieval of information from working memory. To achieve this, a working memory load manipulation to study the specifc interactions of orienting and memory load. The pattern of RT is similar to those found

  3. DANE TECHNICAL NOTE INFN -LNF, Accelerator Division

    E-print Network

    Istituto Nazionale di Fisica Nucleare (INFN)

    for the coil and shields to undergo to critical temperature gradient during the cool down. The JT can be opened) commissioning and the design of four innovative "coaxial auto shielded" Transfer Lines (TLs) for Liquid Helium to the superconducting coil and to the shields in a continuous filling mode. Only the 4.4 K He is supplied

  4. 2014 PMEL Lab Review FY2011 Journal Articles

    E-print Network

    budgets. J. Geophys. Res., 116, G01009, doi: 10.1029/2010JG001398. [PDF Version.1029/2011GL047083, 6 pp. [PDF Version] Cont. #: 3417 Atwood, E., J.T. Duffy.1365- 2419.2010.00559.x, 493-507. [PDF Version] Cont. #: 3544 Aufdenkampe, A

  5. Lineage specific transcriptional profiles of Symbiodinium spp. unaltered by heat stress in a coral host

    E-print Network

    Palumbi, Stephen

    in a coral host Barshis DJ1* , Ladner JT1 , Oliver TA1 , and Stephen R. Palumbi1 1 Department of Biology of the genus Symbiodinium form an endosymbiosis with reef building corals, in which photosynthetically-derived nutrients comprise the majority of the coral energy budget. An extraordinary amount of functional

  6. Goal-Directed Supervision of Social Work Students in Field Placement

    ERIC Educational Resources Information Center

    St. John, David

    1975-01-01

    Presents a goal-directed paradigm for supervision of social work students in a field placement within a Veterans Administration Drug Abuse Program. Included is a rational breakdown of five phases in placement: screening, minimum orientation, Goal Work Sheet, body of placement, and evaluation and closure. (Editor/JT)

  7. LIurinL,( htnurtry.4J |1993) 0104-4203'9:l 506 00 I I 993

    E-print Network

    Short, Daniel

    \\lbcrnarlel)amlrcthc API:S und the opcn occln is rcslrictcdto lnlels in thc Outcr Banks barrier islands.Frcshwater dischargc of thc Ncuse R ivcr ts low in relalr()n (o the sr and the dvnamrcsof suspcndedsetlinrcnltn thc cstuiry jt his becn inferrcd tlrat thc Ncuse rctatns lines clliciently

  8. An investigation of accessory chromosomes in Panicum Coloratum L

    E-print Network

    Burson, Byron Lynn

    1965-01-01

    'a "& ', ia gf the 'fbi I . 8 & 'ii ofc cg j~" ' ' 'I ' Q '. lou ia. . ~ e, uyyjf jina:n ~ ', . I -i gp, ' c 'I lg ?. " 'I ii'ipca ' I' jt y"f ~, feei, i;I eh ' pcllc 1 '91 . ' Qd ?n hc cp!h . . ". "c ycecln 3- Rc'h day fo lj if 6, uat9. ou, a...

  9. NUMERICAL STUDY OF THE DERIVATIVE OF THE RIEMANN ZETA FUNCTION AT ZEROS

    E-print Network

    Odlyzko, Andrew M.

    the tails of the distribution, we consider the moments (1.3) J(T) := 1 N(T) 0 at zeros. Preparation of this material was partially supported by the National Science Foundation under conjecture, gave lower order terms in asymptotic expansions for J1(T) and J2(T). They conjectured

  10. BOLETIN DE AVES MARINAS LATINOAMERICANAS [C.I.P.A. (I.C.B.P . )! P.S:G.] VOLUMEN 1 , NUMERO 1 , 1986.

    E-print Network

    Duffy, David Cameron

    Aves Acuaticas Casilla Correcs ' 3368 1000 Buenos Aires , Argentina Malcolm Coulter River EcologyBOLETIN DE AVES MARINAS LATINOAMERICANAS [C.I.P.A. (I.C.B.P . )! P.S:G.] VOLUMEN 1 , NUMERO 1 cientificos, con inter~s en el estudio ' y la conservaci6n de aves marinas en Jt.rn~rica Latina. Sera publicad

  11. Consumerism As an Emerging Issue for Postsecondary Education

    ERIC Educational Resources Information Center

    El-Khawas, Elaine

    1975-01-01

    Examines increasing application of consumerism vocabulary to postsecondary education citing federal and state action to protect students' rights as consumers. Lists steps institutions can take to avoid regulation by voluntarily complying with consumer standards of truth-in-advertising and full disclosure of pertinent information. (JT)

  12. IFUSION POVVER DEVELOPMENT PATHWAYS Stephen 0. Dean

    E-print Network

    mission "to develop the scientific basis for a compact and continuously operating tokamak fusion reactor of seven program elements: Tokamak Fusion Test Reactor, Tokamak Physics Experiment, ITER,Materials Test Fusion Test Reactor (and similar non-U.S. devices JET and JT-60) provides a test of tokamak plasma

  13. The Cooperative College Registry 1963-1975

    ERIC Educational Resources Information Center

    Fisher, Elizabeth

    1976-01-01

    Traces the history of the nonprofit Cooperative College Registry (CCR), 1963-1975, concluding that it demonstrated that a matching service for jobs and job-seekers in academia is feasible and will work if well-supported financially and that success is related to value placed on human relationships and personal service rendered. (JT)

  14. Hansen, J. et al., 2002: Global warming continues. Science, 295, 275. Global Warming Continues

    E-print Network

    Academy Press, Washington, DC, 85 pp. (2000). 5. Intergovernmental Panel on Climate Change (IPCC), Climate Change 2001, eds. J.T. Houghton et al., Cambridge Univ. Press, New York, 2001. #12;Hansen, J. et alHansen, J. et al., 2002: Global warming continues. Science, 295, 275. Global Warming Continues

  15. Accountability for Graduate Medical Education: Report of an Unsuccessful Experiment

    ERIC Educational Resources Information Center

    Bucher, Robert M.; Moore, Richard J.

    1975-01-01

    An experiment is reported which utilized a professional medical care organization as the base for intern and resident education. The major reason for its failure was the rigidity of Medicare regulations. The data suggest the mechanism is feasible and could potentially obviate many problems of hospital-based programs. (Editor/JT)

  16. ER QUALITY CONTROL CAN LEAD TO RETROGRADE TRANSPORT FROM THE ER LUMEN TO THE CYTOSOL AND THE NUCLEOPLASM IN

    E-print Network

    , Leeds Institute for Plant Biotechnology and Agriculture, School of Biology, University of Leeds, LS2 9JT. Complete signal peptide processing even after long term expression in virus infected leaves rules out inhibitors. The use of GFP imaging in the detection of retrograde transport from the ER and screening

  17. This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research

    E-print Network

    Schweik, Charles M.

    Labs, West Mains Road, Edinburgh, EH9 3JT, UK d Ecology Department, National University of Mongolia, Ulaanbaatar Mongolia e National Geo-information Center for Natural Resource Management, Ulaanbaatar, Mongolia f Wildlife Conservation Society, Mongolia Program, Ulaanbaatar, Mongolia g Wildlife Conservation

  18. UFR Sciences et Techniques Master Ecosystmes et environnement spcialit Ecosystmes contaminants sant, ECoS -semestres 3 et 4 MCC 2013-2014 C. Cont session 2 O/N C. Cont

    E-print Network

    Jeanjean, Louis

    santé, ECoS - semestres 3 et 4 MCC 2013-2014 C. Cont session 2 O/N C. Cont code élément lib long Contaminants microbiologiques Laurence MILLON / Daniel GILBERT UE 2 68 6 7 7 100% oral/écrit N JT9ECOEP Eco

  19. High Mach flow associated with X point MARFE and plasma detachment

    Microsoft Academic Search

    A. Hatayama; H. Segawa; R. Schneider; D. P. Coster; N. Hayashi; S. Sakurai; N. Asakura; M. Ogasawara

    2000-01-01

    High Mach flows and their formation mechanism in tokamak divertor regions have been studied. Numerical calculations using a two dimensional edge plasma simulation code (the B2-EIRENE code) have been made for the JT-60U open divertor geometry with discharge parameter ranges of relatively low input power and L mode experiments. In the high density case, typical formation of an X point

  20. Operational Management of Area Environment.

    ERIC Educational Resources Information Center

    Sprague, George W.

    Three phases leading to the automation of the mechanical building systems on the Harvard campus are described. The systems allow a single operator to monitor and control all the mechanical systems, plus fire, flood, and security alarms, for all buildings in a large area of the campus. (JT)

  1. Acoustic wave propagation in one-dimensional random media: the wave localization approach

    E-print Network

    van der Baan, Mirko

    der Baan* School of Earth Sciences, University of Leeds, Leeds, LS2 9JT, UK. E-mail: mvdbaan@earth front traversing a heterogeneous medium. Sato & Fehler (1998), for instance, gave a good overview solutions can only be established in some rare and extremely simplified cases. However, most of * Formerly

  2. Equal Protection of the Laws: Sex is Not a Suspect Classification; Kahn v. Shevin, 94 S. Ct. 1734 (1974)

    ERIC Educational Resources Information Center

    Thomas, Gregg Darrow

    1974-01-01

    In Kahn v. Shevin the Supreme Court upheld a Florida Supreme Court ruling that a state tax exemption for widows was not in violation of the Fourteenth Amendment. The author discusses this and earlier sex discrimination cases, holding that a strict scrutiny test in such cases would promote equality of the sexes. (JT)

  3. Preferential Economic Treatment for Women: Some Constitutional and Practical Implications of Kahn v. Shevin

    ERIC Educational Resources Information Center

    Clark, Margaret Elizabeth

    1975-01-01

    The 1974 Supreme Court decision in Kahn v. Shevin upheld a property tax exemption statute for widows. This Note analyzes the soundness and social utility of the underlying premise and evaluates its potential impact on other areas of law. Includes review of relevant state, lower federal court and Supreme Court cases. (JT)

  4. Integrated water management with reuse: A programing approach

    E-print Network

    Pingry, David E.; Shaftel, Tim L.

    1979-01-01

    treatment plant or user. Jt or J,, will be used whenever flow is going to a treatment plant or user. The model notation is as follows. qu decision variable denoting flow from node i to nodej for i  I and j  J (volume/time); x n decision variable...

  5. NITRATE MOVEMENT IN SOUTHEASTERN COASTAL PLAIN SOILS UNDER CONSERVATION-TILLED VEGETABLE PRODUCTION

    E-print Network

    Decoteau, Dennis R.

    NITRATE MOVEMENT IN SOUTHEASTERN COASTAL PLAIN SOILS UNDER CONSERVATION-TILLED VEGETABLE PRODUCTION before and after vegetable crop production over a four year period. This publication reports soil nitrate G.D. Hoyt1 , D.C. Sanders2 , J.T. D.R. Decoteau3 , ABSTRACT Movement of soil nitrates by leaching

  6. The Coagulation Method of Starting Lecture-Discussion Courses

    ERIC Educational Resources Information Center

    Nyberg, David

    1976-01-01

    Describes a method used in the first class periods of a foundations of education course of 20-35 students to introduce students to each other and develop the interpersonal climate necessary for an effective discussion course. Involves breaking up into groups of five strangers for personal introductions and later class presentations. (JT)

  7. Characteristics of a liquid-helium-free calibration apparatus for cryogenic thermometers

    SciTech Connect

    Shimazaki, T. [National Metrology Institute of Japan, AIST, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563 (Japan)] [National Metrology Institute of Japan, AIST, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563 (Japan)

    2013-09-11

    Closed-cycle Joule-Thomson (JT) cryocoolers have been developed at National Metrology Institute of Japan (NMIJ)/National Institute of Advanced Industrial Science and Technology (AIST) with the aim of realizing a liquid-helium-free calibration apparatus for cryogenic thermometers between 0.65 K and 25 K. The latest JT cryocooler at NMIJ/AIST consists of a {sup 3}He JT cooling circuit and a pulse tube mechanical refrigerator. The characteristics of the apparatus including a residual gas analysis of the JT cooling circuit are presented in this paper. Currently the initial cool-down is performed using a heat-exchange gas. It normally takes about 30 h to reduce the temperature from room temperature to 5 K at the thermometer comparison block of the apparatus. The correct timing of the removal of the heatexchange gas is important for the efficient operation of the apparatus. Incomplete removal of the heat-exchange gas induces excess heat load on the apparatus and thermal disturbances. Some examples of abrupt temperature bursts are discussed in this paper. Mechanical refrigerators generate cyclic mechanical vibrations, and precision resistance thermometers are usually very sensitive to a mechanical vibration. The measured vibration level of the developed apparatus is reported. The damage to the apparatus due to the magnitude 9.0 earthquake on March 11, 2011, and possible countermeasures in the case of future earthquakes are also discussed.

  8. THERMOCHEMISTRY OF JOINING Thomas W. Eagar

    E-print Network

    Eagar, Thomas W.

    !J.t of welding fluxes for both steel and titanium alloys. Similarly, therm?chemical analysis ofdiatomicgas and fusion welding each involve a number of complex chemical interactions. Unfortunately, many rese matrix composites. In fusion welding, thermochemical analysis has been used to aid in development of self

  9. Split sex ratios in the social Hymenoptera: a meta-analysis

    E-print Network

    West, Stuart

    Split sex ratios in the social Hymenoptera: a meta-analysis Joe¨l Meunier,a Stuart A. West, West Mains Road, Edinburgh EH9 3JT, UK The study of sex allocation in social Hymenoptera (ants, bees Hymenoptera. Overall, variation in relatedness asymmetry (due to mate number or queen re- placement

  10. Helium liquefier cycles with saturated vapor compression

    Microsoft Academic Search

    M. Minta; J. L. Smith Jr.

    1982-01-01

    The three refrigeration stages of the conventional helium liquefaction cycle are related to liquid nitrogen precooling, the use of expansion engines, and a J-T expansion. For an operation of helium refrigerators at temperatures below 4.2 K reduced pressure levels are required. Such an operation makes it necessary to enhance the compressor size and the heat exchanger surface area. In the

  11. SHELTER THROUGH ARCHITECTURAL DESIGN, THE SHIELDING REQUIREMENTS INFLUENCE ON FORM.

    ERIC Educational Resources Information Center

    Office of Civil Defense (DOD), Washington, DC.

    FALLOUT PROTECTION CAN BE PROVIDED BY CAREFUL ARRANGEMENT OF ARCHITECTURAL ELEMENTS WITHOUT SPECIFIC FACILITIES FOR THEIR PURPOSE AND WITHOUT INTERFERING WITH NORMAL SPACE USE. CHARACTERISTICS OF RADIATION ARE DISCUSSED AND ILLUSTRATED PRINCIPLES OF SHIELDING DESIGN WITH RESPECT TO DISTANCE, GEOMETRY, AND TIME ARE GIVEN. (JT)

  12. Cell-type Specific Optogenetic Mice for Dissecting Neural Circuitry Function

    E-print Network

    Schnitzer, Mark

    transgenic mouse lines developed in this study have been deposited to the Jackson Laboratory and are under development for future distribution. The stock numbers, official stock names, and links to the Jackson slice experiments for all mouse lines in the Feng Lab. J.T. performed electrophysiological recordings

  13. Dwight Allen in Africa

    ERIC Educational Resources Information Center

    O'Connor, Douglas

    1975-01-01

    An interview with Dwight Allen regarding his work under a UNESCO Technical Assistance Grant on the development of a National Teacher Training College in Lesotho, Africa. In discussing innovation, such as an item-bank system of student testing, he emphasizes the duty of innovators to be responsible, if not always right. (JT)

  14. An economic study of the Texsun Citrus Exchange

    E-print Network

    Liao, Shubert Shui-Chien

    1950-01-01

    ?nc^ S 4 SIzI hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh CS 8 h Ryrtn- RJe-n-4 ?nc^ S 4 SI.?2 ?7^ RaneryJ- hhhhhhhhhhhhhhhhhh hh h CC 9h *Jo Neo AyeL T^pJ a9 ftNpJ9tnyr TtJJ- N- a9 ?nc^ S 4 SI.? h h h 8 C. SMh Uvaner a9 Dn-yeJ-- 3 TJl-ne Ryrtn... Dcn-1 at *n7^ NtJ r1J va-r oJ-ytN7cJ N- 9tJ-1 9tnyr Neo 7tyeE 1yE1Jt tJrnte- ra Eta,Jt-4 TJlN- byrtn- ptaonbryae tJNb1Jo z'4'MM4MMM 7alJ- ye SIQOxQx!h T1y- 0acnvJ ,N- 38 pJt bJer a9 r1J eNryae8- EtNpJ9tnyr ptaonbryae Neo 5 pJt bJer a9 r1J eNryaeS...

  15. Range migration algorithm for airborne squint mode spotlight SAR imaging

    E-print Network

    Lim, Jong-Tae

    Range migration algorithm for airborne squint mode spotlight SAR imaging H.-S. Shin and J.-T. Lim algorithm (RMA), the RMA is not available to process an airborne squint-mode spotlight synthetic aperture radar (SAR) data. Thus, the modified reference signal to transform a squint-mode data to a broadside

  16. An Arabidopsis pex10 Null Mutant Is Embryo Lethal, Implicating Peroxisomes in an Essential Role during

    E-print Network

    functions in plants, including seed reserve mobilization, photorespiration, defense against oxidative stress during Plant Embryogenesis1 Imogen A. Sparkes, Federica Brandizzi, Stephen P. Slocombe, Mahmoud El-Shami2 , Chris Hawes, and Alison Baker* Centre for Plant Sciences, University of Leeds, Leeds LS2 9JT United

  17. Accreditation of Veterinary Medical Education: Part II--Influence of the American Veterinary Medical Association

    ERIC Educational Resources Information Center

    Bauer, Elizabeth K.

    1975-01-01

    Traces the development, since its founding in 1863, of the American Veterinary Medical Association (AVMA) influence over the standards of training required in the veterinary profession. Attention is focused on the roles of the U.S. Department of Agriculture, the military, and the land-grant colleges in that development. (JT)

  18. Educational Materials Reviewed for AVLINE

    ERIC Educational Resources Information Center

    Jones, Norbert A.; And Others

    1976-01-01

    Information gathered from faculty members about nontextbook educational materials is reviewed by the Association of American Medical Colleges before cataloging, indexing, and abstracting at the National Library of Medicine for listing in AVLINE, a computer information service available through the MEDLARS system. (JT)

  19. The Bargain without Knowing (Stage 1) Devil KATE COLLINI

    E-print Network

    Hernes, Peter J.

    CAST The Bargain without Knowing (Stage 1) Devil KATE COLLINI Father DAN CATO WILSON Mother RACHEL PEET COCKE Miller ANDREA DEL MORAL Devil DEIRDRE MORRIS Handless Maiden AMANDA VITELLO-JENSEN Finding COOPER WISE Maiden CALLIE HEYER Messenger STEPHANIE RIVAS Devil ZOE SAMBORSKI ENSEMBLE Eileen Asevedo JT

  20. The Future of Fusion Jiangang Li (j_li@ipp.ac.cn)

    E-print Network

    , Illinois · 26-30 June, 2011 #12;Contents · Energy Needs in 21st Century · Lessons learned from past plant #12;Lessons learned from past With Courtesy from D. Meade #12;Lessons learned from past T3,T7, TFR, ,JT-60, JET (16MW) TFTR 10MW ITER ITER site decided #12;Lessons learned from past ­ TFTR construction

  1. High poloidal beta long-pulse experiments in the Tokamak Fusion Test Reactor*

    E-print Network

    Mauel, Michael E.

    was consistent with the predictions of ideal magnetohydrodynamics (MHD) stability analyses. I. INTRODUCTION dis- charges the bootstrap current fraction was calculated to be large and the bootstrap current. high poloidal beta experiments with high bootstrap frac- tions. The Japan Tokamak-60 (JT-60) experiment

  2. Assessing Competence in Pediatric Cardiology

    ERIC Educational Resources Information Center

    Johnson, Apul E.; And Others

    1976-01-01

    In response to the need to assure physician competence, a rating scale was developed at the University of Minnesota Medical School for use in evaluating clinical competence in pediatric cardiology. It was tested on first- and second-year specialists. Development and testing procedures are described. (JT)

  3. Are the Private Colleges Slipping?

    ERIC Educational Resources Information Center

    Bowen, Howard R.

    1976-01-01

    Based on 1974-75 financial data and 1975-76 projections the author concludes that for private colleges the faculty-student ratio has changed little, new programs far outnumber terminations, faculty performance has improved, enrollments are slightly up. Debit side: students less well prepared, faculty salaries hurt by inflation. (Editor/JT)

  4. ORIGINAL ARTICLE A three-dimensional assay for measurement of viral-induced

    E-print Network

    Hemminki, Akseli

    ORIGINAL ARTICLE A three-dimensional assay for measurement of viral-induced oncolysis JT Lam1 and oncolysis measurements may be improved with such three-dimensional models. Also, preclinical analyses of oncolytic viruses frequently measure mitochondrial activity, but more accurate measures of oncolysis might

  5. TEXTURE DEVELOPMENT IN THE SHEAR FLOW OF

    E-print Network

    Kurnikova, Maria

    , 633 nm) Scattered light intensity distribution (laser, 633 nm) t/ R(t) (t) Strain Time Creep Recovery Linear Viscoelasticity: Creep: (t) = J(t) = {R(t) + t/} Recovery on cessation of steady flow: R(t) = R, white light) Flow Vorticity P radius r = R r =0 Turbid Clear Photo of turbid-clear transition. Torque

  6. Impurity injection scenario in the burning plasma

    E-print Network

    Agreement #12;Outline Introduction High radiation experiments and impurity transport study in JT-60U Reduction of heat load onto the divertor plates Enhancement of radiation loss by injecting seed impurity (frad~0.9) High radiation loss around the main plasma edge is required. Radiation loss in the core

  7. The Scientific Prototype, a Proposed Next Step for the American MFE Program

    NASA Astrophysics Data System (ADS)

    Manheimer, Wallace

    2013-08-01

    The "Scientific Prototype" is a tokamak about the size and power of JET, TFTR or JT-60, but which runs steady state in DT and breeds its own tritium. This paper, more in the spirit of an editorial than a scientific research publication, argues that it is the only reasonable option for the American MFE program.

  8. Cluster of Infections Caused by Methicillin-Resistant Staphylococcus pseudintermedius in Humans in a Tertiary Hospital

    PubMed Central

    Börjesson, Stefan; Grönlund-Andersson, Ulrika; Tellgren-Roth, Christian; Melhus, Åsa

    2014-01-01

    The dog-associated Staphylococcus pseudintermedius is a rare pathogen in humans. Here we describe a cluster of infections caused by the methicillin-resistant S. pseudintermedius clone ST71-J-t02-II–III. It involved four elderly patients at a tertiary hospital. Three patients had wound infections, and the strain had a tendency to cause bullous skin lesions. PMID:24871217

  9. 3.22 Mechanical Properties of Materials Test 2: Viscoelasticity and Plasticity

    E-print Network

    Goldwasser, Shafi

    3.22 Mechanical Properties of Materials Test 2: Viscoelasticity and Plasticity April 25, 2002 You are allowed to bring one 8.5" x 11" sheet into the test. 1. The creep behaviour of polyethylene is given by the creep compliance data in the table below. Creep compliance of Polyethylene t (hours) J(t) (psi-1) 0 0

  10. On the discovery of Birkhoff's theorem

    E-print Network

    Johansen, N V

    2006-01-01

    Birkhoff showed in 1923 that the Schwarzschild solution for the metric from a point particle was also valid in the a priori non-static case as long as the spherical symmetry was maintained. This theorem was actually discovered and published two years earlier by an unknown Norwegian physicist, J.T. Jebsen. His life and scientific carreer is briefly chronicled.

  11. On the discovery of Birkhoff's theorem

    E-print Network

    Nils Voje Johansen; Finn Ravndal

    2005-09-06

    Birkhoff showed in 1923 that the Schwarzschild solution for the metric from a point particle was also valid in the a priori non-static case as long as the spherical symmetry was maintained. This theorem was actually discovered and published two years earlier by an unknown Norwegian physicist, J.T. Jebsen. His life and scientific career is briefly chronicled.

  12. Cryogenic recondenser with remote cold box

    Microsoft Academic Search

    A. J. Bartlett; B. R. Andeen; P. A. Lessard

    1988-01-01

    This patent describes a cryogenic recondenser for recondensing cryogen retained in a storage vessel. The recondenser consists of: cooling means comprising a mechanical refrigerator positioned outside of the storage vessel, the means precooling a volume of gaseous refrigerant; a transfer line leading from the cooling means and removeably inserted into the storage vessel; and a JT valve at an end

  13. Cryogenic recondenser with remote cold box

    SciTech Connect

    Bartlett, A.J.; Andeen, B.R.; Lessard, P.A.

    1988-08-30

    This patent describes a cryogenic recondenser for recondensing cryogen retained in a storage vessel. The recondenser consists of: cooling means comprising a mechanical refrigerator positioned outside of the storage vessel, the means precooling a volume of gaseous refrigerant; a transfer line leading from the cooling means and removeably inserted into the storage vessel; and a JT valve at an end of the transfer line in the storage vessel, the precooled refrigerant being transferred in the transfer line from the cooling means to the JT valve in heat exchange relation with returning refrigerant and being expanded through the JT valve to form a liquid-gas cryogen mixture within the end of the transfer line which is in heat exchange relation with boil-off from the cryogen retained in the storage vessel such that the boil off is cooled and recondensed; refrigerant being returned to the cooling means through the transfer line in a manner in which the returning refrigerant is in heat exchange relation with the refrigerant being transferred to the JT valve.

  14. Geometric Simulation of Perovskite Frameworks with Jahn-Teller Distortions: Applications to the Cubic Manganites

    E-print Network

    Thorpe, Michael

    Geometric Simulation of Perovskite Frameworks with Jahn-Teller Distortions: Applications December 2005; published 7 August 2006) A new approach is presented for modeling perovskite frameworks in the presence of disorder in networks of corner-shared JT-distorted octahedra such as the perovskites. Geometric

  15. National Collegiate Athletic Association's Certification Requirement: A Section 1 Violation of the Sherman Antitrust Act

    ERIC Educational Resources Information Center

    Valparaiso University Law Review, 1974

    1974-01-01

    It is contended that the national Collegiate Athletic Association (NCAA) requirements for certification of amateur athletic events are violative of the Sherman Antitrust Act. Revisions in the certification requirements are suggested which would control the amateur standing and economic exploitation of the athlete but with minimum restriction. (JT)

  16. Student Pre- and Post-Evaluation of an Off-Campus Clinical Clerkship

    ERIC Educational Resources Information Center

    Campbell, R. Keith

    1975-01-01

    Describes the development and use of standardized forms found to be effective for evaluating clinical clerkship experiences of pharmacy students. Copies of the Preliminary Questionnaire and the Post-Evaluation Form are included along with the goals of the Washington State University College of Pharmacy Clinical Pharmacy Program. (JT)

  17. International Journal of Artificial Intelligence in Education (1999), 10, 350-364 The defining characteristics of intelligent tutoring systems

    E-print Network

    Paris-Sud XI, Université de

    1999-01-01

    characteristics of intelligent tutoring systems research: ITSs care, precisely John Self, Computer Based Learning Unit, University of Leeds, Leeds LS2 9JT, England, E-mail: jas@cbl.leeds.ac.uk Based on an invited talk of educational, psychological and social knowledge which are often left implicit. INTRODUCTION The aim

  18. Applied Mathematical Models in Human Physiology September 12, 2003

    E-print Network

    Olufsen, Mette Sofie

    Applied Mathematical Models in Human Physiology September 12, 2003 J.T. Ottesen, M.S. Olufsen is to study mathematical models of human physiology. The book is a result of work by Math­ Tech (in Copenhagen research publications contributing to the understanding of human physiology. This book contains

  19. To Teach Youth Better

    ERIC Educational Resources Information Center

    Redefer, Frederick L.

    1975-01-01

    A Professor Emeritus of New York University reviews the practice of awarding recognition for superior college teaching (great teacher awards) concluding that they do not increase great teaching or the number of great teachers. He suggests that prospective students should seriously ask colleges what they do to insure good teaching. (JT)

  20. Calcite crystal growth orientation: implications for trace metal uptake into coccoliths

    E-print Network

    Benning, Liane G.

    , University of Leeds, Leeds, LS2 9JT, UK 2 Department of Earth Sciences, Oxford University, Parks Road, Oxford). * E-mail: v.payne@see.leeds.ac.uk DOI: 10.1180/minmag.2008.072.1.269 Mineralogical Magazine, February

  1. Action of plant growth regulators and salinity on seed germination of Ceratoides lanata

    Microsoft Academic Search

    M. Ajmal Khan; Bilquees Gul; Darrell J. Weber

    2004-01-01

    Ceratoides lanata (Pursh) J.T. Howell is a shrub with numerous annual branchlets from the family Chenopodiaceae and is widely distributed in brackish water playas of northern Utah. Seeds had no dormancy, and about 90% of the seeds germinated in nonsaline control. Seed germination decreased with the increase in salinity, and more than 10% of the seeds germinated at 900 mmol\\/L

  2. Phase Separation and Percolative Insulator-Metal Transition in LaMnO3 Under Pressure: A Gutzwiller Variational Study

    NASA Astrophysics Data System (ADS)

    Sherafati, Mohammad; Satpathy, Sashi

    2014-03-01

    We study the pressure-induced insulator-metal transition and phase separation in LaMnO3 (LMO) using the Gutzwiller variational method. Being an insulator at ambient pressure, a long-debated question is whether LMO is a correlation-driven Mott insulator or a band insulator driven by the Jahn-Teller (JT) mechanism. Recent Raman measurements of LMO (Ref. 1) reveal a coexistence of domains of JT-distorted and undistorted octahedra between 3 and 34 GPa and indicate a critical threshold for the volume fraction of the latter domains as a herald of the metallic state. To explain these findings, we solve an extended Hubbard model including the JT distortions and cohesive energy as a function of volume for spinless eg electrons of Mn3+ in paramagnetic LMO at room temperature. Our results clearly show a phase separation on both sides of the transition pressure (Pc = 32 GPa) where domains of distorted (insulating) and undistorted (metallic) octahedra coexist supporting the percolative nature of the transition. Based on our work, the ground state under pressure is determined by the interplay of both Coulomb and JT interactions and it is predicted that the mixed-phase region extends well above Pc into the metallic region. Ref. : 1) M. Baldini et al., PRL 106, 066402 (2011) Work supported by the US Department of Energy.

  3. Planning in Higher Education: Approaches and Problems

    ERIC Educational Resources Information Center

    Vaccaro, Louis C.

    1976-01-01

    A college president discusses long-range planning in a private college and suggests problems and difficulties confronting those responsible for it emphasizing the critical ingredient of presidential leadership qualities that stimulate a spirit of dialogue and philosophizing about the nature, aims, and objectives of the institution. (JT)

  4. In Search of Wisdom

    ERIC Educational Resources Information Center

    Vaccaro, Louis C.

    1975-01-01

    Arguing that students' demand for relevance is for wisdom rather than for utilitarian knowledge, and that it is caused by poor teaching, particularly in the liberal arts, the author emphasizes the individual teacher's responsibility to communicate the proper view of education, to lead students in their search for wisdom. (JT)

  5. Toward Sustainable Production of Protein-Rich Foods: Appraisal of Eight Crops for Western Europe. PART I. Analysis of the Primary Links of the Production Chain

    Microsoft Academic Search

    Anita R. Linnemann; Dolf Swaving Dijkstra

    2002-01-01

    Referee: Dr. R. Owusu Apenten, Department of Food Science, The Leeds University, Leeds LS2 9JT, United Kingdom Increased production of plant protein is required to support the production of protein-rich foods that can replace meat in the human diet to reduce the strain that intensive animal husbandry poses to the environment. The suitability of lupin (Lupinus spp.), pea (Pisum sativum),

  6. Maharishi International University

    ERIC Educational Resources Information Center

    Goldberg, Phil

    1975-01-01

    The director of curriculum development at Maharishi International University describes background and design of the program based on the Science of Creative Intelligence (SCI) as a unifying theoretical structure and on transcendental meditation (TM) for expanding awareness and utilizing videotape technology in its core curriculum courses. (JT)

  7. Evaporative Cooling of Antiprotons to Cryogenic Temperatures G. B. Andresen,1

    E-print Network

    Wurtele, Jonathan

    Evaporative Cooling of Antiprotons to Cryogenic Temperatures G. B. Andresen,1 M. D. Ashkezari,2 M the application of evaporative cooling to clouds of trapped antiprotons, resulting in plasmas with measured.27.Jt, 64.70.fm Historically, forced evaporative cooling has been suc- cessfully applied to trapped

  8. Robust stability of nonlinear singularly perturbed system with uncertainties

    E-print Network

    Lim, Jong-Tae

    Robust stability of nonlinear singularly perturbed system with uncertainties J.-W. Son and J.-T. Lim Abstract: The singularly perturbed system is easily analysed by two time-scale systems, each and the reduced model of the nominal system. Robust stability analysis of nonlinear singularly perturbed systems

  9. Internal Medicine and Pediatric Residency Education for Primary Care

    ERIC Educational Resources Information Center

    Charney, Evan

    1975-01-01

    Residency programs for primary practice are described with focus on: model practice goals, the setting, and scheduling; faculty, including some approaches for resolving the new "town-gown" dichotomy; and the two basic types of curricula (family medicine model and the more traditional internship experience). (JT)

  10. CURRICULUM VITAE Terry D. Ellis, PhD, PT, NCS

    E-print Network

    Guenther, Frank

    .E. Which Tests of Physical Mobility Best Predict Quality of Life in People with Parkinson's Disease and Mid-Stage Parkinson Disease. Physical Therapy; 2011;91:1339-1354 Earhart G.M., Cavanaugh J.T., Ellis T, Test-retest Reliability, and Factors Contributing to Performance in People with Parkinson Disease. JNPT

  11. AUSLANDER ALGEBRAS AS QUASI-HEREDITARY VLASTIMIL DLAB AND CLAUS MICHAEL RINGEL

    E-print Network

    Ringel, Claus Michael

    that in this way we obtain a heredity chain of ideals of A (see the definition below). Usually, there exist many/N is semisimple artinian. We say that an ideal J of A is a heredity ideal of A if P = J, JNJ = 0 and /, considered, for each 1 heredity ideal of A/Jt_v Such a sequence of ideals is called

  12. The Coming Age of People Work

    ERIC Educational Resources Information Center

    Berger, Brigitte

    1976-01-01

    Notes a chasm between cultural and occupational aspirations (for self-realization) and the existing job market. Suggests the opening of a new sector of people work, e.g. services for the very young and very old, urban and community task forces, political participation groups, agencies for intergroup conflict resolution, etc. (JT)

  13. Trypanosomal TAC40 constitutes a novel subclass of mitochondrial -barrel proteins specialized in

    E-print Network

    Schnaufer, Achim

    , CH-3012 Bern, Switzerland; c Institute of Immunology and Infection Research and Centre for Immunity, Infection, and Evolution, University of Edinburgh, Edinburgh EH9 3JT, United Kingdom; d Faculty of Biology and participate in transmembrane complexes that are essential for mitochondrial DNA inheritance. In yeast MDM10

  14. Photocopy of original drawing showing Wing A (drawing located at ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Photocopy of original drawing showing Wing A (drawing located at NAWS China Lake, Division of Public Works). J.T. STAFFORD-J.H. DAVIES-H.L. GOGERTY: DISPENSARY, SICK CALL AND ADMINISTRATION, ROOF FRAMING PLAN AND DETAILS - Naval Ordnance Test Station Inyokern, Dispensary, Main Site, Lauritsen Road at McIntyre Street, Ridgecrest, Kern County, CA

  15. Photocopy of original drawing showing Wing A (drawing located at ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Photocopy of original drawing showing Wing A (drawing located at NAWS China Lake, Division of Public Works). J.T. STAFFORD-J.H. DAVIES- H.L. GOGERTY: DISPENSARY, SICK CALL AND ADMINISTRATION, FLOOR PLAN AND ELEVATIONS - Naval Ordnance Test Station Inyokern, Dispensary, Main Site, Lauritsen Road at McIntyre Street, Ridgecrest, Kern County, CA

  16. LOW TECHNOLOGY HIGH TRITIUM BREEDING BLANKET CONCEPT* Y. Gohar, C. C. Baker, D. L. Smith, M. C. Billone, Y. S. Cha,

    E-print Network

    Harilal, S. S.

    LOW TECHNOLOGY HIGH TRITIUM BREEDING BLANKET CONCEPT* Y. Gohar, C. C. Baker, D. L. Smith, M. CS EOGUKEfJT IS UNLIMITED #12;LOW TECHNOLOGY HIGH TRITIUM BREEDING BLANKET CONCEPT* Y. Gohar, C. C. Baker, D technology high tritium breeding blanket concept was developed for the INTOR design. The main function

  17. Teachers' Freedom of Expression Outside the Classroom: An Analysis of the Application of Pickering and Tinker

    ERIC Educational Resources Information Center

    Miller, Simon A.

    1974-01-01

    Two Supreme Court cases are analyzed with reference to lower court decisions and their implications: Pickering v. Board of Education, which concerned teachers' expression outside the school, and Tinker v. Des Moines Independent Community School District, which involved students' expression inside the classroom. (JT)

  18. 3314 IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, VOL. 56, NO. 9, SEPTEMBER 2009 High-Order Sliding-Mode Control of

    E-print Network

    Paris-Sud XI, Université de

    --High-order sliding mode, power generation control, wind turbine. NOMENCLATURE v Wind speed (in meters per second inertia (in kilogram­square meter). Jt Turbine total inertia (in kilogram­square meter). Kt Turbine total newton­meters per radian­second). Bt Turbine total external stiffness (in newton­meters per radian

  19. Photocopy of original drawing showing Building 3 layout (drawing located ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Photocopy of original drawing showing Building 3 layout (drawing located at NAWS China Lake, Division of Public Works). J.T. STAFFORD-J.H. DAVIES-H.L. GOGERTY: DISPENSARY, CONNECTING CORRIDORS, FLOOR PLAN, ELEVATIONS, AND DETAILS - Naval Ordnance Test Station Inyokern, Dispensary, Main Site, Lauritsen Road at McIntyre Street, Ridgecrest, Kern County, CA

  20. Efficiency of Handout "Skeleton" Notes in Student Learning

    ERIC Educational Resources Information Center

    Klemm, W. R.

    1976-01-01

    Data from a control group experiment show that the use of handout skeleton notes distinctly improved student learning. Use of mimeographed copies of detailed lecture outlines for a comparative physiology course allowed students to interact with the lecture material at the time it was presented. (JT)