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Sample records for katrin jgar jt

  1. 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 Scaling law Scaling law «Artifical Mass Simulation» requires: · Installation of additional masses

  2. Tritium processing loop for KATRIN experiment

    SciTech Connect

    Kazachenko, O.; Bornschein, B.; Kernert, N.; Doerr, L.; Glugla, M.; Weber, V.; Stern, D.

    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)

  3. Detecting sterile neutrinos with KATRIN like experiments

    E-print Network

    Anna Sejersen Riis; Steen Hannestad

    2011-02-08

    A sterile neutrino with mass in the eV range, mixing with the electron antineutrino, is allowed and possibly even preferred by cosmology and oscillation experiments. If such eV-mass neutrinos exist they provide a much better target for direct detection in beta decay experiments than the active neutrinos which are expected to have sub-eV masses. Their relatively high mass would allow for an easy separation from the primary decay signal in experiments such as KATRIN.

  4. Measurements with the KATRIN pre-spectrometer

    NASA Astrophysics Data System (ADS)

    Bornschein, L.; The Katrin Collaboration

    2006-07-01

    The objective of the KArlsruhe TRItium Neutrino experiment (KATRIN) is a direct measurement of the absolute mass of the electron (anti)neutrino by means of precise spectroscopy of the tritium ?-spectrum near its endpoint. The pre-spectrometer is part of the KATRIN reference set-up where it will work as a pre-filter for low energy ?-decay electrons that are inessential for the determination of the ?-mass. Since its delivery in autumn 2003 the pre-spectrometer has been the first major hardware component of KATRIN in operation at Forschungszentrum Karlsruhe (FZK). The vacuum measurements were successfully completed in early 2005. The main results are an outgassing rate for the stainless steel surface of the pre-spectrometer of 10 -12 mbar l/s cm 2 at room temperature and a final pressure below 10 -11 mbar. This corresponds to the specification of the main spectrometer. The amount of Non-Evaporable-Getter (NEG) strips needed can be restricted to about 3000 m and the additional cooling of the main spectrometer is optional, if a combined pumping system of NEG and turbo-molecular pumps (TMPs) is installed, that will provide a sufficient pumping speed. The modification of the pre-spectrometer set-up for the electromagnetic measurements is nearly completed, and the measurements will start in spring 2006.

  5. 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 ...

  6. Tools for electromagnetic field simulation in the KATRIN experiment

    E-print Network

    Corona, Thomas Joseph

    2009-01-01

    The Karlsruhe Tritium Neutrino (KATRIN) experiment is a tritium beta decay experiment designed to make a direct, model independent measurement of the electron neutrino mass. To accomplish this task, the experiment employs ...

  7. 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.

  8. Cryogenic Design of the Katrin Source Cryostat

    NASA Astrophysics Data System (ADS)

    Grohmann, S.; Bonn, J.; Bornschein, B.; Gehring, R.; Gil, W.; Kazachenko, O.; Neumann, H.; Noe, M.; Weiss, C.

    2008-03-01

    The KATRIN experiment will measure the mass of electron antineutrinos with a sensitivity of 0.2 eV/c2 by the precise measurement of the tritium ? spectrum. A key component is the Windowless Gaseous Tritium Source (WGTS), which will deliver 1011 ? decay electrons per second. The WGTS consists in its centre of a 10 m long beam tube operated at 30 K, which is surrounded by a series of superconducting solenoids. Molecular tritium is injected through a central injection chamber and pumped at either beam tube end. The tritium density profile must have a stability of 10-3 to limit systematic errors, yielding stringent requirements on the beam tube temperature homogeneity (±30 mK) and stability (±30 mK/h). This shall be achieved with a design, where the thermal radiation heat from the vacuum pumps is almost entirely absorbed by LN2 and He coolers on the pump ports, while the beam tube temperature is stabilized with saturated Ne in a thermosiphon. Starting from a functional description, we explain the cryogenic design of the magnet cryostat featuring 13 separate fluid circuits with 6 cryogenic fluids. Besides magnet cooling, we focus on the beam tube cooling and present the preparations for a full-scale demonstrator test.

  9. Computational Forensics: Towards Hybrid-Intelligent Crime Investigation Katrin Franke

    E-print Network

    Computational Forensics: Towards Hybrid-Intelligent Crime Investigation Katrin Franke Norwegian become important tools for performing certain forensic functions. Yet, knowledge and intuition methods in forensics. The state of the art is described, some practical examples are given and a viewpoint

  10. CONVERSATIONAL SPEECH RECOGNITION USING ACOUSTIC AND ARTICULATORY Katrin Kirchhoff

    E-print Network

    Washington at Seattle, University of

    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

  11. Development of the JT-60SA Neutral Beam Injectors

    SciTech Connect

    Hanada, M.; Kojima, A.; Inoue, T.; Watanabe, K.; Taniguchi, M.; Kashiwagi, M.; Tobari, H.; Umeda, N.; Akino, N.; Kazawa, M.; Oasa, K.; Komata, M.; Usui, K.; Mogaki, K.; Sasaki, S.; Kikuchi, K.; Nemoto, S.; Ohshima, K.; Endo, Y.; Simizu, T.

    2011-09-26

    This paper describes the development of the neutral beam (NB) systems on JT-60SA, where 30-34 MW D{sup 0} beams are required to be injected for 100 s. A 30 s operation of the NB injectors suggests that existing beamline components and positive ion sources on JT-60U can be reused without the modifications on JT-60 SA. The JT-60 negative ion source was modified to improve the voltage holding capability, which leads to a successful acceleration of 2.8 A H{sup -} ion beam up to 500 keV of the rated acceleration energy for JT-60SA.

  12. Present Status of JT-60SA Project and Development of Heating Systems for JT-60SA

    NASA Astrophysics Data System (ADS)

    Yoshitaka, Ikeda; JT-60SA Team

    2011-06-01

    Present status of the JT-60SA (JT-60 Super Advanced) project, implemented jointly by Europe and Japan since 2007, is described. The design of the main tokamak components was completed in late 2008, and all the scientific missions are preserved to contribute to ITER and DEMO reactors. The construction of the JT-60SA has begun with procurement activities for the superconducting magnet systems, vacuum vessel, in-vessel components and other components under the relevant procurement arrangements between the implementing agencies of JAEA (Japan Atomic Energy Agency) in Japan and Fusion for Energy in Europe. Designs and developments of the auxiliary heating systems for JT-60SA have been progressing at JAEA so as to provide the total injection power of 41 MW for 100 s.

  13. The JT8D and JT9D engine component improvement: Performance improvement program

    NASA Technical Reports Server (NTRS)

    Gaffin, W. O.

    1982-01-01

    The NASA sponsored Engine Component Improvement - Performance Improvement Program at Pratt & Whitney Aircraft advanced the state of the art of thermal barrier coatings and ceramic seal systems, demonstrated the practicality of an advanced turbine clearance control system and an advanced fan design in the JT9D engine, and demonstrated the advantages of modern cooling, sealing, and aerodynamic designs in the high pressure turbine and compressor of the JT8D engine. Several of these improvements are already in airline service in JT8D and JT9D engines, and others will enter service soon in advanced models of these engines. In addition, the technology advances are being transferred to completely new engine configurations, the PW2037 engine and the NASA sponsored Energy Efficient Engine.

  14. First tritium results of the KATRIN test experiment TRAP

    SciTech Connect

    Eichelhardt, F.; Bornschein, B.; Bornschein, L.; Kazachenko, O.; Kernert, N.; Sturm, M.

    2008-07-15

    The TRAP experiment (Tritium Argon frost Pump) has been built at the Tritium Laboratory Karlsruhe (TLK) as a test rig for the Cryogenic Pumping Section (CPS) of the Karlsruhe Tritium Neutrino Experiment (KATRIN). TRAP employs a heterogeneous layer of pre-condensed argon to adsorb hydrogen isotopes at {approx} 4.2 K This paper presents results obtained in the first three tritium experiments with TRAP. (authors)

  15. 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.

  16. 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.

    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.

  17. JT-60SA superconducting magnet system

    NASA Astrophysics Data System (ADS)

    Koide, Y.; Yoshida, K.; Wanner, M.; Barabaschi, P.; Cucchiaro, A.; Davis, S.; Decool, P.; Di Pietro, E.; Disset, G.; Genini, L.; Hajnal, N.; Heller, R.; Honda, A.; Ikeda, Y.; Kamada, Y.; Kashiwa, Y.; Kizu, K.; Kamiya, K.; Murakami, H.; Michel, F.; Marechal, J. L.; Phillips, G.; Polli, G. M.; Rossi, P.; Shibanuma, K.; Takahata, K.; Tomarchio, V.; Tsuchiya, K.; Usui, K.; Verrecchia, M.; Zani, L.

    2015-08-01

    The most distinctive feature of the superconducting magnet system for JT-60SA is the optimized coil structure in terms of the space utilization as well as the highly accurate coil manufacturing, thus meeting the requirements for the steady-state tokamak research: a conceptually new outer inter-coil structure separated from the casing is introduced to the toroidal field coils to realize their slender shape, allowing large-bore diagnostic ports for detailed plasma measurements. A method to minimize the manufacturing error of the equilibrium-field coils has been established, aiming at the precise plasma shape/position control. A compact butt-joint has been successfully developed for the Central Solenoid, which allows an optimized utilization of the limited space for the Central Solenoid to extend the duration of the plasma pulse.

  18. 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.

  19. KATRIN Sensitivity to Sterile Neutrino Mass in the Shadow of Lightest Neutrino Mass

    E-print Network

    Arman Esmaili; Orlando L. G. Peres

    2012-06-28

    The presence of light sterile neutrinos would strongly modify the energy spectrum of the Tritium \\beta-electrons. We perform an analysis of the KATRIN experiment's sensitivity by scanning almost all the allowed region of neutrino mass-squared difference and mixing angles of the 3+1 scenario. We consider the effect of the unknown absolute mass scale of active neutrinos on the sensitivity of KATRIN to the sterile neutrino mass. We show that after 3 years of data-taking, the KATRIN experiment can be sensitive to mixing angles as small as sin^2 (2\\theta_s) ~ 10^-2. Particularly we show that for small mixing angles, sin^2 (2\\theta_s) sterile mass-squared difference.

  20. KATRIN: an experiment to determine the neutrino mass

    E-print Network

    Fraenkle, F M

    2011-01-01

    The KArlsruhe TRItium Neutrino (KATRIN) experiment is a next generation, model independent, large scale experiment to determine the neutrino mass 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. To achieve the desired sensitivity, the WGTS, in which tritium decays with an activity of about 10e11 Bq, needs to be stable on the 0.1 % level in injection pressure and temperature at an absolute value of about 30 K. With the capability to create an axial magnetic field of 3.6 T the WGTS is going to be one of the world's most complex superconducting magnet and cryostat systems. The main spectrometer (length 24 m, diameter 10 m...

  1. Advanced fusion technologies developed for JT-60 superconducting tokamak

    NASA Astrophysics Data System (ADS)

    Sakasai, A.; Ishida, S.; Matsukawa, M.; Akino, N.; Ando, T.; Arai, T.; Ezato, K.; Hamada, K.; Ichige, H.; Isono, T.; Kaminaga, A.; Kato, T.; Kawano, K.; Kikuchi, M.; Kizu, K.; Koizumi, N.; Kudo, Y.; Kurita, G.; Masaki, K.; Matsui, K.; Miura, Y. M.; Miya, N.; Miyo, Y.; Morioka, A.; Nakajima, H.; Nunoya, Y.; Oikawa, A.; Okuno, K.; Sakurai, S.; Sasajima, T.; Satoh, K.; Shimizu, K.; Takeji, S.; Takenaga, K.; Tamai, H.; Taniguchi, M.; Tobita, K.; Tsuchiya, K.; Urata, K.; Yagyu, J.

    2004-02-01

    Modification of JT-60 as a full superconducting tokamak (JT-60SC) is planned. The objectives of the JT-60SC programme are to establish scientific and technological bases for steady-state operation of high performance plasmas and utilization of reduced-activation materials in an economically and environmentally attractive DEMO reactor. Advanced fusion technologies relevant to the DEMO reactor have been developed for the superconducting magnet technology and plasma facing components of the JT-60SC design. To achieve a high current density in a superconducting strand, Nb3Al strands with a high copper ratio of 4 have been newly developed for the toroidal field coils (TFCs) of JT-60SC. The R&D to demonstrate the applicability of the Nb3Al conductor to TFCs by a react-and-wind technique has been carried out using a full-size Nb3Al conductor. A full-size NbTi conductor with low ac loss using Ni-coated strands has been successfully developed. A forced cooling divertor component with high heat transfer using screw tubes has been developed for the first time. The heat removal performance of the carbon fibre composite target was successfully demonstrated on an electron beam irradiation stand.

  2. Performance verification tests of JT-60SA CS model coil

    NASA Astrophysics Data System (ADS)

    Obana, Tetsuhiro; Murakami, Haruyuki; Takahata, Kazuya; Hamaguchi, Shinji; Chikaraishi, Hirotaka; Mito, Toshiyuki; Imagawa, Shinsaku; Kizu, Kaname; Natsume, Kyohei; Yoshida, Kiyoshi

    2015-11-01

    As a final check of the coil manufacturing method of the JT-60 Super Advanced (JT-60SA) central solenoid (CS), we verified the performance of a CS model coil. The model coil comprised a quad-pancake wound with a Nb3Sn cable-in-conduit conductor. Measurements of the critical current, joint resistance, pressure drop, and magnetic field were conducted in the verification tests. In the critical-current measurement, the critical current of the model coil coincided with the estimation derived from a strain of -0.62% for the Nb3Sn strands. As a result, critical-current degradation caused by the coil manufacturing process was not observed. The results of the performance verification tests indicate that the model coil met the design requirements. Consequently, the manufacturing process of the JT-60SA CS was established.

  3. Performance of JT-60SA divertor Thomson scattering diagnostics.

    PubMed

    Kajita, Shin; Hatae, Takaki; Tojo, Hiroshi; Enokuchi, Akito; Hamano, Takashi; Shimizu, Katsuhiro; Kawashima, Hisato

    2015-08-01

    For the satellite tokamak JT-60 Super Advanced (JT-60SA), a divertor Thomson scattering measurement system is planning to be installed. In this study, we improved the design of the collection optics based on the previous one, in which it was found that the solid angle of the collection optics became very small, mainly because of poor accessibility to the measurement region. By improvement, the solid angle was increased by up to approximately five times. To accurately assess the measurement performance, background noise was assessed using the plasma parameters in two typical discharges in JT-60SA calculated from the SONIC code. Moreover, the influence of the reflection of bremsstrahlung radiation by the wall is simulated by using a ray tracing simulation. The errors in the temperature and the density are assessed based on the simulation results for three typical field of views. PMID:26329196

  4. Tritium distribution in JT-60U W-shaped divertor

    NASA Astrophysics Data System (ADS)

    Masaki, K.; Sugiyama, K.; Tanabe, T.; Gotoh, Y.; Miyasaka, K.; Tobita, K.; Miyo, Y.; Kaminaga, A.; Kodama, K.; Arai, T.; Miya, N.

    2003-03-01

    Detailed tritium profiles on the JAERI Tokamak-60U (JT-60U) W-shaped divertor and the first wall tiles were examined by a tritium imaging plate technique (TIPT) and full combustion method. The highest tritium level (60 kBq/cm 2) was observed at the dome top tiles. The tritium level of the divertor target was lower (2 kBq/cm 2). The result of the triton deposition simulation using orbit following Monte-Carlo code was consistent with the tritium distribution obtained by TIPT and full combustion method. These results indicate that the tritium distribution of the JT-60U W-shaped divertor reflects mainly the distribution of the energetic triton impinging on the wall. According to the simulation, the tritium atoms produced by D-D nuclear reaction in JT-60U are not loosing completely their initial energy of 1 MeV and around 1/3 of them are implanted into the wall.

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

    E-print Network

    Washington at Seattle, University of

    pronunciation, phonology, morphology, syntax, and the lexicon. Moreover, the regional dialects of ArabicCROSS-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

  6. Self-majorizing Elements in Archimedean Vector Lattices Katrin Teichert and Martin R. Weber

    E-print Network

    Weber, Martin R.

    Self-majorizing Elements in Archimedean Vector Lattices Katrin Teichert and Martin R. Weber of Analysis Kaiserslautern, Germany Dresden, Germany A finite element in an Archimedean vector lattice N. Such elements exist in many vector lattices and naturally occur in different contexts

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

    SciTech Connect

    Fränkle, F. M.

    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.

  8. 1999 J.T. Raviz. All rights reserved. CHAPTER TWO

    E-print Network

    contained in this assessment of the Lake Tahoe watershed. Human beings have been a component of the Lake© 1999 J.T. Ravizé. All rights reserved. CHAPTER TWO A CONTEXTUAL OVERVIEW OF HUMAN LAND USE A CONTEXTUAL OVERVIEW OF HUMAN LAND USE AND ENVIRONMENTAL CONDITIONS Susan Lindström with contributions from

  9. ----~\\r-~-0~Jt...L. Z~~l~.

    E-print Network

    , C/)I) RESERVOIRS FOR ~1) FISH-RICE FARMING ----~\\r- ~-0~Jt...L. Z~~l~.::d~-~~ ) #12;Fish farming in either operation. A survey of fish farming operations indicates that successful fish farmers favor and drainage are required when fish are raised. Fish farming operations utilize res- ervoirs of a great variety

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

    SciTech Connect

    Gil, W.; Bolz, H.; Jansen, A.; Müller, K.; Steidl, M.; Hagedorn, D.

    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.

  11. 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.

  12. MIXING STUDY FOR JT-71/72 TANKS

    SciTech Connect

    Lee, S.

    2013-11-26

    All modeling calculations for the mixing operations of miscible fluids contained in HBLine tanks, JT-71/72, were performed by taking a three-dimensional Computational Fluid Dynamics (CFD) approach. The CFD modeling results were benchmarked against the literature results and the previous SRNL test results to validate the model. Final performance calculations were performed by using the validated model to quantify the mixing time for the HB-Line tanks. The mixing study results for the JT-71/72 tanks show that, for the cases modeled, the mixing time required for blending of the tank contents is no more than 35 minutes, which is well below 2.5 hours of recirculation pump operation. Therefore, the results demonstrate the adequacy of 2.5 hours’ mixing time of the tank contents by one recirculation pump to get well mixed.

  13. JT9D ceramic outer air seal system refinement program

    NASA Technical Reports Server (NTRS)

    Gaffin, W. O.

    1982-01-01

    The abradability and durability characteristics of the plasma sprayed system were improved by refinement and optimization of the plasma spray process and the metal substrate design. The acceptability of the final seal system for engine testing was demonstrated by an extensive rig test program which included thermal shock tolerance, thermal gradient, thermal cycle, erosion, and abradability tests. An interim seal system design was also subjected to 2500 endurance test cycles in a JT9D-7 engine.

  14. Copyright Notice Triton Burnup Study in JT-60U

    E-print Network

    Copyright Notice Triton Burnup Study in JT-60U T. Nishitani, M. Hoek1, H. Harano2, G.A. Wurden3, R of 1 MeV tritons produced in the d(d,p)t reaction is important to predict the properties of D-T produced 3.5 MeV alphas because 1 MeV tritons and 3.5 MeV alphas have similar kinematic properties

  15. 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.

  16. 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

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

    E-print Network

    Bilmes, Jeff

    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

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

    E-print Network

    Herschlag, Dan

    Probing the Tetrahymena Group I Ribozyme Reaction in Both Directions Katrin Karbstein, Kate S, Stanford, California 94305-5307 ReceiVed April 5, 2002 ABSTRACT: The Tetrahymena L-21 ScaI ribozyme derived results suggest that the Tetrahymena group I ribozyme, analogous to protein enzymes, uses multiple

  19. Nonlocal energetic particle mode in a JT-60U plasma

    NASA Astrophysics Data System (ADS)

    Todo, Y.; Shinohara, K.; Takechi, M.; Ishikawa, M.

    2005-01-01

    Energetic-ion driven instability in a Japan Atomic Energy Research Institute Tokamak-60 Upgrade (JT-60U) [S. Ishida et al., Phys. Plasmas 11, 2532 (2004)] plasma was investigated using a simulation code for magnetohydrodynamics and energetic particles. The spatial profile of the unstable mode peaks near the plasma center where the safety factor profile is flat. The unstable mode is not a toroidal Alfvén eigenmode (TAE) because the spatial profile deviates from the expected location of TAE and the spatial profile consists of a single primary harmonic m /n=2/1 where m and n are poloidal and toroidal mode numbers. The real frequency of the unstable mode is close to the experimental starting frequency of the fast frequency sweeping mode. Simulation results demonstrate that energetic-ion orbit width and energetic-ion pressure significantly broaden radial profile of the unstable mode. For the smallest value among the investigated energetic-ion orbit width, the unstable mode is localized within 20% of the minor radius. This gives an upper limit of the spatial profile width of the unstable mode which the magnetohydrodynamic effects alone can induce. For the experimental condition of the JT-60U plasma, energetic ions broaden the radial width of the unstable mode spatial profile by a factor of 3. The unstable mode is primarily induced by the energetic particles.

  20. Performance Study on ST/JT Hybrid Cryocoolers Working at Liquid Helium Temperature

    NASA Astrophysics Data System (ADS)

    Dongli, Liu; Xuan, Tao; Xiao, Sun; Zhihua, Gan

    The ST/JT hybridcryocooler consists of a Stirling-typecryocooler and a J-T loop. The common process of steady-state operation is given. Pressure-Enthalpy map analysis and thermodynamic calculation showhow the precooling temperature, high pressure and recuperator effectiveness affect thecooling powerat liquid helium temperature. Applying the current performance level of the Stirling cooler,the overall COP of the hybrid cryocooleris roughly optimized. This performance study shows that the hybrid cryocooler can develop its performance potential with improved J-T compressors with larger pressure ratio and aprecooler working at lower temperature.

  1. 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.

  2. Measurement of gaseous impurities in JT-60U

    NASA Astrophysics Data System (ADS)

    Hosogane, N.; Shimada, M.; Shimizu, K.; Tsuji, S.; Matsuyama, S.; Kubo, H.; Sugie, T.; Arai, T.; Kaminaga, A.; Nakamura, H.

    1995-04-01

    Using quadrupole mass analyzers, measurements were made of gaseous impurity pressures at the inner and outer divertor regions and at the mid-plane during neutral beam heated discharges in JT-60U. The hydrocarbon partial pressures in both divertor regions increase with the deuterium pressure, as a common function of deuterium pressure, (i.e., PCD4=3×10 -2PD20.7for CD 4), irrespective of different discharge conditions of neutral beam heating power, direction of ion grad-B drift and gas puffing. On the other hand, the pressures of CO and CO 2 are rather insensitive to the deuterium pressure. The sum of the gaseous impurity partial pressures is dominated by CO and CO 2 in the low recycling discharges, and by hydrocarbons in the high recycling discharges. The total gaseous impurity pressure, as a fraction of the deuterium pressure, is on the order of 50% and 1-10% in the respective recycling regimes.

  3. RF heated wall conditioning discharges in JT-60U

    NASA Astrophysics Data System (ADS)

    Itami, K.; Asakura, N.; Tamai, H.; Moriyama, S.; Kaminaga, A.

    2009-06-01

    In series of experiments in 2000 and 2008, helium wall conditioning discharges by ECRF heating (ECH) were extensively studied in JT-60U with BT = 3.6 T and PECRF ? 2.5 MW. Homogeneous ECH conditioning discharges were reproducibly obtained by applying the horizontal field as large as 0.2% of BT. It was found that the horizontal field is effective to extend He plasma toward high field side from the fundamental resonant surfaces of ECH. The ECH wall conditioning discharge with PECRF = 2.5 MW and tpulse = 1.5 s was applied after the plasma disruption with W = 3.3 MJ and the successful recovery of the current ramp-up with 0.5 V/m of ohmic electric field was obtained.

  4. Long Pulse Operation on NBI Systems for JT-60U

    SciTech Connect

    Akino, N.; Ebisawa, N.; Honda, A.; Ikeda, Y.; Kawai, M.; Kazawa, M.; Mogaki, K.; Ohga, T.; Umeda, N.; Usui, K.; Yamamoto, T.; Grisham, L.

    2005-04-15

    In the neutral beam injection (NBI) system, an extension of the pulse duration up to 30 sec has been intended to study quasi-steady state plasma on JT-60U. The four positive-ion based (P-NBI) units, which tangentially inject neutral beam to plasma, were mainly modified on the electric power supplies and the beam limiters to extend the pulse duration up to 30 sec with 2 MW at 80 keV per each. The seven P-NBI units, each of which perpendicularly injects for 10 sec, were conducted to operate in series for the total pulse duration of 30 sec. The ion source of the negative-ion based (N-NBI) unit, whose target beam energy is 500 keV for 10 sec, was also modified to reduce the heat load of the grid for long pulse operation. The reduction of the re-ionization of the neutral beam in the beam drift duct was a key to achieve a long pulse injection. It was found that the pressure rise in the beam drift duct, which gives the re-ionization rate, depended on the temperature of the re-ionization plates during NBI injection. Up to now, it was attained successfully that the pulse duration of the tangential P-NBI unit was extended up to 30 sec. 310 MJ of the total integrated injection energy into JT-60U plasma was achieved, including the negative-ion based NBI operation for 17 sec at 366 keV.

  5. Advanced tokamak research with integrated modeling in JT-60 Upgradea)

    NASA Astrophysics Data System (ADS)

    Hayashi, N.; JT-60 Team

    2010-05-01

    Researches on advanced tokamak (AT) have progressed with integrated modeling in JT-60 Upgrade [N. Oyama et al., Nucl. Fusion 49, 104007 (2009)]. Based on JT-60U experimental analyses and first principle simulations, new models were developed and integrated into core, rotation, edge/pedestal, and scrape-off-layer (SOL)/divertor codes. The integrated models clarified complex and autonomous features in AT. An integrated core model was implemented to take account of an anomalous radial transport of alpha particles caused by Alfven eigenmodes. It showed the reduction in the fusion gain by the anomalous radial transport and further escape of alpha particles. Integrated rotation model showed mechanisms of rotation driven by the magnetic-field-ripple loss of fast ions and the charge separation due to fast-ion drift. An inward pinch model of high-Z impurity due to the atomic process was developed and indicated that the pinch velocity increases with the toroidal rotation. Integrated edge/pedestal model clarified causes of collisionality dependence of energy loss due to the edge localized mode and the enhancement of energy loss by steepening a core pressure gradient just inside the pedestal top. An ideal magnetohydrodynamics stability code was developed to take account of toroidal rotation and clarified a destabilizing effect of rotation on the pedestal. Integrated SOL/divertor model clarified a mechanism of X-point multifaceted asymmetric radiation from edge. A model of the SOL flow driven by core particle orbits which partially enter the SOL was developed by introducing the ion-orbit-induced flow to fluid equations.

  6. Combined Brayton-JT cycles with refrigerants for natural gas liquefaction

    NASA Astrophysics Data System (ADS)

    Chang, Ho-Myung; Park, Jae Hoon; Lee, Sanggyu; Choe, Kun Hyung

    2012-06-01

    Thermodynamic cycles for natural gas liquefaction with single-component refrigerants are investigated under a governmental project in Korea, aiming at new processes to meet the requirements on high efficiency, large capacity, and simple equipment. Based upon the optimization theory recently published by the present authors, it is proposed to replace the methane-JT cycle in conventional cascade process with a nitrogen-Brayton cycle. A variety of systems to combine nitrogen-Brayton, ethane-JT and propane-JT cycles are simulated with Aspen HYSYS and quantitatively compared in terms of thermodynamic efficiency, flow rate of refrigerants, and estimated size of heat exchangers. A specific Brayton-JT cycle is suggested with detailed thermodynamic data for further process development. The suggested cycle is expected to be more efficient and simpler than the existing cascade process, while still taking advantage of easy and robust operation with single-component refrigerants.

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

    SciTech Connect

    Leiber, B.; 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.

  8. A 727/JT8D-100 series engine exhaust system propulsion performance model test

    NASA Technical Reports Server (NTRS)

    Haugan, W. J.; Kern, P. R. A.

    1974-01-01

    The results are presented from testing one-eighth scale models of the Pratt and Whitney aircraft reference and Boeing nozzles for the JT8D-100 series mixed flow engines. The objective of the test was to obtain the nozzle velocity and flow coefficients for the reference configurations and compare these with the Boeing configurations which incorporated a longer splitter between the fan and primary flows. A further comparison was made between the JT8D-100 series nozzles and the Boeing JT8D-9/727 production nozzle performance. A statistical analysis was used to compare configurations which showed the performance (velocity coefficient) of the reference and the Boeing configuration was the same for the JT8D-109. It also showed no difference between reference and the Boeing configuration for the JT8D-115 and no difference for the JT8D-117 nozzles. Bypass ratio (match) was shown to be equally dependent on splitter position as on nozzle area within the range investigated. The nozzles were very similar in flow coefficient within an engine family. Excellent profile data was recorded. The effects of swirl on the nozzle performance was examined and found to degrade the velocity and flow coefficients.

  9. Program for refan JT8D engine design, fabrication and test, phase 2

    NASA Technical Reports Server (NTRS)

    Glass, J. A.; Zimmerman, E. S.; Scaramella, V. M.

    1975-01-01

    The objective of the JT8D refan program was to design, fabricate, and test certifiable modifications of the JT8D engine which would reduce noise generated by JT8D powered aircraft. This was to be accomplished without affecting reliability and maintainability, at minimum retrofit cost, and with no performance penalty. The mechanical design, engine performance and stability characteristics at sea-level and altitude, and the engine noise characteristics of the test engines are documented. Results confirmed the structural integrity of the JT8D-109. Engine operation was stable throughout the airplane flight envelope. Fuel consumption of the test engines was higher than that required to meet the goal of no airplane performance penalty, but the causes were identified and corrected during a normal pre-certification engine development program. Compared to the baseline JT8D-109 engine, the acoustically treated JT8D-109 engine showed noise reductions of 6 PNdB at takeoff and 11 PNdB at a typical approach power setting.

  10. KATRIN: a New Beta-Spectroscopic Experiment to Determine the Neutrino Mass

    SciTech Connect

    Dragoun, Otokar

    2007-11-26

    Almost sixty years effort to determine the neutrino mass from experimental {beta}-ray spectra resulted recently in the model independent limit of m{sub v}<2.3 eV/c{sup 2}. The Karlsruhe Tritium Neutrino Experiment (KATRTN) should improve this limit to m{sub v}<0.2 eV/c{sup 2}, while the neutrino mass of 0.3 and 0.4 eV/c{sup 2} should be seen as 3.5 and 6.5 {sigma} effect, respectively. Some details of the KATRIN setup, including the windowless gaseous tritium source and a tandem of two electrostatic retarding spectrometers with adiabatic magnetic collimation, are outlined.

  11. Status of the KATRIN experiment and prospects to search for keV-mass sterile neutrinos in tritium ?-decay

    SciTech Connect

    Mertens, Susanne

    2015-03-24

    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?? (90% CL) could be reached.

  12. Status of the KATRIN experiment and prospects to search for keV-mass sterile neutrinos in tritium ?-decay

    DOE PAGESBeta

    Mertens, Susanne

    2015-03-24

    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 sourcemore »luminosity, a statistical sensitivity down to active-sterile mixing angles of sin² ? « less

  13. 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.

  14. Absolute calibration of microfission chamber in JT-60U

    SciTech Connect

    Hayashi, Takao; Nishitani, Takeo; Sukegawa, Atsuhiko M.; Ishikawa, Masao; Shinohara, Kouji

    2008-10-15

    We have conducted calibrations of a microfission chamber, which was installed between the vacuum vessel and the toroidal field coils, by both a Cf-252 neutron source and real deuterium plasmas in JT-60U. The detector employs both pulse counting and Campbell (mean square voltage) modes in the electronics to cover a wide dynamic range of the neutron source strength. The pulse counting and Campbell modes were calibrated by Cf-252 and deuterium plasmas, respectively. Point efficiencies, counts per neutron from a point at a single angle, were measured for 27 locations of the neutron point source in toroidal scan. The efficiencies were influenced by the various components such as the vacuum vessel, port, and graphite tiles. The point efficiencies can be integrated and averaged with angle to provide toroidal line efficiencies. The line efficiencies of the microfission chamber and the nearest neutron monitor of the U-235 fission chamber were 5.38x10{sup -9} and 1.77x10{sup -8}, respectively. Then the calibration for the Campbell mode was also performed by using a real deuterium plasma. The detection efficiency in the Campbell mode was about three-tenths of that of the nearest neutron monitor, which is consistent with the calibration result obtained by using a Cf-252 neutron source for pulse counting mode.

  15. The JT9D Jet Engine Diagnostics Program

    NASA Technical Reports Server (NTRS)

    Olsson, W. J.

    1982-01-01

    The various engine deterioration phenomena that affect JT9D performance retention were studied, and approaches to improve performance retention of engines were identified. The program included surveys of historical data, monitoring of in service engines, ground and flight testing of instrumented engines, analysis, and analytical modeling. Performance deterioration is made up of both short and long term modes, both of which are flight cycle related phenomena. Short term deterioration occurs primarily during airplane acceptance testing prior to delivery to the airline. This effect is caused by flight load and power induced clearance closures and engine deflections with resulting rubbing of airfoils and seals. Long term deterioration is caused by erosion of airfoils and gas path seals during ground operation and take off and by cyclic induced thermal distortion of the high pressure turbine airfoils. Studies of possible remedial approaches have shown that performance retention within 1 to 2 percent of initial revenue service performance can be achieved with a proper program of hot section and cold section maintenance.

  16. B747/JT9D flight loads and their effect on engine running clearances and performance deterioration; BCAC NAIL/P and WA JT9D engine diagnostics programs

    NASA Technical Reports Server (NTRS)

    Olsson, W. J.; Martin, R. L.

    1982-01-01

    Flight loads on the 747 propulsion system and resulting JT9D blade to outer airseal running clearances during representative acceptance flight and revenue flight sequences were measured. The resulting rub induced clearance changes, and engine performance changes were then analyzed to validate and refine the JT9D-7A short term performance deterioration model.

  17. 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

    ... concerning this proposed AD. Using the search function of the Web site, anyone can find and read the comments... JT8D-209, -217, -217A, -217C, and -219 Turbofan Engines AGENCY: Federal Aviation Administration (FAA... airworthiness directive (AD) for Pratt & Whitney (PW) JT8D-209, -217, -217A, -217C, and -219 turbofan...

  18. Biosynthesis of Gold Nanoparticles Using Fusarium oxysporum f. sp. cubense JT1, a Plant Pathogenic Fungus

    PubMed Central

    Thakker, Janki N.; Dalwadi, Pranay; Dhandhukia, Pinakin C.

    2013-01-01

    The development of reliable processes for the synthesis of gold nanoparticles is an important aspect of current nanotechnology research. Recently, reports are published on the extracellular as well as intracellular biosynthesis of gold nanoparticles using microorganisms. However, these methods of synthesis are rather slow. In present study, rapid and extracellular synthesis of gold nanoparticles using a plant pathogenic fungus F. oxysporum f. sp. cubense JT1 (FocJT1) is reported. Incubation of FocJT1 mycelium with auric chloride solution produces gold nanoparticles in 60?min. Gold nanoparticles were characterized by UV-Vis spectroscopy, FTIR, and particle size analysis. The particles synthesized were of 22?nm sized, capped by proteins, and posed antimicrobial activity against Pseudomonas sp. PMID:25969773

  19. Development of the Hybrid Jt-Expander Cycle for NG Liquefaction Cycle

    NASA Astrophysics Data System (ADS)

    Baek, S.; Hwang, G.; Jeong, S.

    2010-04-01

    Two liquefaction cycles for LNG (liquefied natural gas) production are compared in this paper. One is a well known MR (mixed refrigerant) JT cycle with two phase separators and four heat exchangers. Another one is the novel concept of hybrid cycle, which is to replace the last stage JT expansion with a turbine expander. The inlet flow to the turbine expander is deliberately warmed up by NG (natural gas) stream to guarantee superheated vapor phase and increase useful work. The turbine expander is to extract pressure exergy and reduce entropy generation by producing work and alleviating work requirement in the compressor. This paper describes the detailed processes of hybrid JT-expander cycle and the quantitative comparison results by HYSYS simulation under some realistic physical constraints.

  20. Pratt and Whitney Aircraft JT8D turbofan engine. performance improvement to offset rising fuel costs

    SciTech Connect

    Fahle, R.K.

    1980-01-01

    A Pratt and Whitney Aircraft Group program begun in 1978 has led to the development of retrofit kit packages and major engine modifications that will provide thrust-specific fuel consumption (TSFC) reductions of 2.1% for the JT8D-1 and -7 engines, 3.0% for the JT8D-9 engine, and 5.5% for the JT8D-15, -17, and -17R engines under cruise conditions, and comparable fuel savings under other conditions. The modifications being made will affect the fan, compressor, and turbine sections of the engines to improve component efficiency. The retrofit kits will be used on existing in-service engines; other modifications will be introduced in service during 1981 and 1982. Fuel savings per engine per year could range from 27,000 to 91,000 gal, and fleet savings could amount to several hundred million gallons per year.

  1. 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.

  2. Atomization and combustion characteristics of antimisting fuels using JT8D and air-boost injectors

    NASA Technical Reports Server (NTRS)

    Kennedy, J. B.; Florentino, A. J.

    1986-01-01

    The atomization levels of antimisting fuels are presently determined for a JT8D fuel injector, a low emission airblast JT8D injector, and an air-boost injector, at operating conditions simulating engine operating conditions. The effects of the use of antimisting kerosene (AMK) on component performance are also studied in the case of an in-service JT8D engine. The use of the AMK fuel causes a decline in the quality of the spray, most notably as a large increase in the Sauter mean diameter for all three injector types. In addition, the idle patternation data obtained indicate that the low emission injector fuel distribution changed from a hollow cone Jet A spray having no fuel at its center to a semihollow spray cone in the case of AMK; this change could disrupt the combustor primary zone recirculation pattern.

  3. 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.

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

    SciTech Connect

    Fu, G.Y.; Cheng, C.Z.; Kimura, H.; Ozeki, T.; Saigusa, M.

    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.

  5. Particle simulation of bursting Alfvn modes in JT-60Ua... S. Briguglio,b

    E-print Network

    Vlad, Gregorio

    -in-cell simulations of a negative neutral beam heated Alfvén-mode experiment in the Japan Atomic Energy Research to the thermal plasma, thus providing a nuclear self-heating mechanism and a route to ignition. The fusion power systems,1 as reported, e.g., in the Japan Atomic Energy Research Institute Tokamak-60 Upgrade JT

  6. Collective Thomson scattering using a pulsed CO2 laser in JT-60U

    NASA Astrophysics Data System (ADS)

    Kondoh, T.; Lee, S.; Hutchinson, D. P.; Richards, R. K.

    2001-01-01

    A collective Thomson scattering (CTS) diagnostic system using a carbon dioxide (CO2) laser has been developed for the purpose of establishing measurement technique of ion temperature and fast alpha particle in a fusion reaction plasma. A pulsed CO2 laser (15 J, 1 ?s at 10.6 ?m) and a heterodyne receiver with a stray light notch filter has been successfully installed. The noise equivalent power of the heterodyne receiver is below 9×10-19 W/Hz up to a frequency of 8 GHz. A six-channel filter bank analyzes the spectrum of the scattered light in the frequency range from 0.4 to 4.5 GHz to measure ion temperature and to detect fast ions generated by negative-ion source neutral beam injection of the JT-60U (Japan Atomic Energy Research Institute Tokamak 60-Upgrade) plasmas [S. Ishida, JT-60U Team, Nucl. Fusion 39, 1211 (1999)]. Test of the CTS system by injecting the CO2 laser into the vacuum vessel of JT-60U has started. Stray light signal around the JT-60U vacuum vessel was detected and optimization of the optical alignment has proceeded.

  7. 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 JERSEY1 WAYNEJ.CRANS Mosquito Research and Control, New Jersey Agricultural Experiment Station, Box 231. New Brunswick, NJ 08903 FREDERICK LESSER THOMAS CANDELETTI Ocean County Mosquito Extermination

  8. Mixed-refrigerant Joule-Thomson (MR JT) mini-cryocoolers

    NASA Astrophysics Data System (ADS)

    Tzabar, Nir

    2014-01-01

    This paper presents the progress in our ongoing research on Mixed-Refrigerant (MR) Joule-Thomson (JT) cryocoolers. The research begun by exploring different MRs and testing various compressors: oil-lubricated and oil-free, reciprocating and linear, custom-made and commercial. Closed-cycle JT cryocoolers benefit from the fact that the compressor might be located far from the cold-end and thus there are no moving parts, no vibrations, and no heat emission near the cold-end. As a consequence, the compressor may be located where there are no severe size limitations, its heat can be conveniently removed, and it can be easily maintained. However, in some applications there is still a demand for a small compressor to drive a JT cryocooler although it is located far from the cooled device. Recently, we have developed a miniature oil-free compressor for MR JT cryocoolers that weighs about 700 g and its volume equals about 300 cc. The cryocooler operates with a MR that contains Ne, N2, and Hydrocarbons. This MR has been widely investigated with different compressors and varying operating conditions and proved to be stable. The current research investigates the performances of MR JT mini-cryocooler operating with the MR mentioned above, driven with our miniature compressor, and a cold-finger prototype. A Dewar with heat load of about 230 mW is cooled to about 80 K at ambient temperatures between 0°C and 40°C. The experimental results obtained are stable and demonstrate the ability to control the cooling temperature by changing the rotation speed of the compressor.

  9. Core transport properties in JT-60U and JET identity plasmas

    NASA Astrophysics Data System (ADS)

    Litaudon, X.; Sakamoto, Y.; de Vries, P. C.; Salmi, A.; Tala, T.; Angioni, C.; Benkadda, S.; Beurskens, M. N. A.; Bourdelle, C.; Brix, M.; Crombé, K.; Fujita, T.; Futatani, S.; Garbet, X.; Giroud, C.; Hawkes, N. C.; Hayashi, N.; Hoang, G. T.; Hogeweij, G. M. D.; Matsunaga, G.; Nakano, T.; Oyama, N.; Parail, V.; Shinohara, K.; Suzuki, T.; Takechi, M.; Takenaga, H.; Takizuka, T.; Urano, H.; Voitsekhovitch, I.; Yoshida, M.; ITPA Transport Group; JT-60 Team; EFDA contributors, JET

    2011-07-01

    The paper compares the transport properties of a set of dimensionless identity experiments performed between JET and JT-60U in the advanced tokamak regime with internal transport barrier, ITB. These International Tokamak Physics Activity, ITPA, joint experiments were carried out with the same plasma shape, toroidal magnetic field ripple and dimensionless profiles as close as possible during the ITB triggering phase in terms of safety factor, normalized Larmor radius, normalized collision frequency, thermal beta, ratio of ion to electron temperatures. Similarities in the ITB triggering mechanisms and sustainment were observed when a good match was achieved of the most relevant normalized profiles except the toroidal Mach number. Similar thermal ion transport levels in the two devices have been measured in either monotonic or non-monotonic q-profiles. In contrast, differences between JET and JT-60U were observed on the electron thermal and particle confinement in reversed magnetic shear configurations. It was found that the larger shear reversal in the very centre (inside normalized radius of 0.2) of JT-60U plasmas allowed the sustainment of stronger electron density ITBs compared with JET. As a consequence of peaked density profile, the core bootstrap current density is more than five times higher in JT-60U compared with JET. Thanks to the bootstrap effect and the slightly broader neutral beam deposition, reversed magnetic shear configurations are self-sustained in JT-60U scenarios. Analyses of similarities and differences between the two devices address key questions on the validity of the usual assumptions made in ITER steady scenario modelling, e.g. a flat density profile in the core with thermal transport barrier? Such assumptions have consequences on the prediction of fusion performance, bootstrap current and on the sustainment of the scenario.

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

    E-print Network

    Bilmes, Jeff

    LOW-RESOURCE NOISE-ROBUST FEATURE POST-PROCESSING ON AURORA 2.0 Chia-Ping Chen Jeff Bilmes Katrin on the Aurora 2.0 noisy- digits database without requiring any increase in model com- plexity. Compared to the Aurora 2.0 baseline system, our tech- nique improves the average word error rate by 45% in the multi

  11. Electron {sup 83}Rb/{sup 83m}Kr Source for the Energy Scale Monitoring in the KATRIN Experiment

    SciTech Connect

    Zboril, Miroslav; Collaboration: KATRIN Collaboration

    2011-12-16

    The KATRIN (KArlsruhe TRItium Neutrino) experiment investigates the endpoint region of the tritium {beta}-spectrum aiming for the sensitivity on the neutrino mass of 0.2 eV (90% C.L.). A spectrometer of the MAC-E filter (Magnetic Adiabatic Collimation with an Electrostatic filter) type will be used for a total time of at least 5 years. An unrecognized shift of the filtering potential would directly influence the resulting neutrino mass. To continuously monitor the filtering potential the high voltage (HV) will be simultaneously applied to an additional MAC-E filter spectrometer. In this monitor spectrometer suitable electron sources based on atomic/nuclear standards will be utilized. As one of such monitoring tools the solid {sup 83}Rb/{sup 83m}Kr source is intended. It provides conversion electrons from {sup 83m}Kr(t{sub 1/2} = 1.83 h) which is continuously generated by {sup 83}Rb(t{sub 1/2}{approx_equal}86 d). The Calibration and Monitoring task of the KATRIN project demands the long-term energy stability {Delta}E/E of the K-32 conversion electron line (E = 17.8 keV, {Gamma} = 2.7 eV) of {+-}1.6 ppm/month.

  12. Passive coolers for pre-cooling of JT loops for deep space infrared imaging applications

    NASA Astrophysics Data System (ADS)

    Zhang, Burt; Larson, Melora; Rodriguez, Jose

    2010-09-01

    Infrared instruments (IR) for deep space imaging missions, such as the James Webb Space Telescope (JWST) and Planck, require cryogenic cooling for proper operation of their focal plane arrays (FPA) in far infrared and sub-millimeter wavelength ranges. The FPA is sometimes located meters away from the spacecraft. To meet such remote cooling requirement, a Joule-Thomson (J-T) loop becomes a convenient choice for either direct cooling for the FPA or for serving as a heat sink for a cascade cooling system. The refrigerant lines of the JT loop inevitably suffer parasitic heat leak primarily due to IR backload as they traverse from the spacecraft to the FPA. An actively cooled JT loop using a mechanical pre-cooler located at the spacecraft will experience the highest parasitic heat leak since the lines are cold through the entire length whereas a passively cooled JT loop can utilize a number of radiators to cool the lines down gradually in stages and hence reduce the heat leak. In addition to savings in power and mass, a passive cooler offers consistent and predictable performance with practically no performance degradation in a thermally stable orbit, such as one around the Sun-Earth L2 point. Passive coolers are less popular in low temperature applications when their cooling capacity diminishes rapidly in proportion to T4 until the temperature reaches a point where either the parasitic heat leak becomes so significant or its size becomes so excessive that the passive cooling scheme becomes impractical. Despite the limited capacity, passive cooling may still prove to be a viable alternative to active cooling depending on the operating temperature and heat dissipation rate of the FPA. The current effort aims at evaluating the merit of using passive coolers as an alternative to using a mechanical cooler for pre-cooling of a JT loop for remote IR instrument cooling. A parametric study is conducted to explore the merits of passive cooling of a JT loop in a temperature range below 30 K. Correlations between cooling capacity, heat leak from supporting structure, and the operating temperature are investigated to provide design guidelines. Radiator staging options will also be presented and discussed.

  13. Characteristics of tungsten and carbon dusts in JT-60U and evaluation of hydrogen isotope retention

    NASA Astrophysics Data System (ADS)

    Ashikawa, Naoko; Asakura, Nobuyuki; Fukumoto, Masakatsu; Hayashi, Takao; Ueda, Yoshio; Muroga, Takeo

    2013-07-01

    Dust was collected after the installation of tungsten (W)-coated tiles in the outer divertor of the P-8 section in JT-60U (2010). Dusts containing tungsten were analyzed by energy-dispersive X-ray spectrometry (EDX) and X-ray photoelectron spectroscopy (XPS). The tungsten intensities measured by EDX and XPS were obtained dusts from the under-dome regions. From a comparison of a numerical analysis of the tungsten deposition layer and analytical results for the atomic concentrations of tungsten, it was determined that dust containing tungsten was produced on the outer dome wing. Hydrogen isotope retention in the dust particles was analyzed by thermal desorption spectrometry (TDS). Using this analytical method, a wide range of dust particle sizes can be retained. The hydrogen isotope retention on dust particles in JT-60U (measured using a few milligrams of dust particles) is shown, and it was approximately 1.5 × 1021 (H2 + HD + D2)/g.

  14. Engine component improvement: Performance improvement, JT9D-7 3.8 AR fan

    NASA Technical Reports Server (NTRS)

    Gaffin, W. O.

    1980-01-01

    A redesigned, fuel efficient fan for the JT9D-7 engine was tested. Tests were conducted to determine the effect of the 3.8 AR fan on performance, stability, operational characteristics, and noise of the JT9D-7 engine relative to the current 4.6 AR Bill-of-Material fan. The 3.8 AR fan provides increased fan efficiency due to a more advanced blade airfoil with increased chord, eliminating one part span shroud and reducing the number of fan blades and fan exit guide vanes. Engine testing at simulated cruise conditions demonstrated the predicted 1.3 percent improvement in specific fuel consumption with the redesigned 3.8 AR fan. Flight testing and sea level stand engine testing demonstrated exhaust gas temperature margins, fan and low pressure compressor stability, operational suitability, and noise levels comparable to the Bill-of-Material fan.

  15. Reduction of JT8D powered aircraft noise by engine refanning

    NASA Technical Reports Server (NTRS)

    Stitt, L. E.; Medeiros, A. A.

    1974-01-01

    The purpose of the Refan Program is to establish the technical feasibility of substantially reducing the noise levels of existing JT8D powered aircraft. This would be accomplished by retrofitting the existing fleet with quieter refan engines and new acoustically treated nacelles. No major technical problems exist that preclude the development and installation of refanned engines on aircraft currently powered by the JT8D engine. The refan concept is technically feasible and provides calculated noise reductions of from 7 to 8 EPNdB for the B727-200 aircraft and from 10 to 12 EPNdB for the DC-9-32 aircraft at the FAR Part 36 measuring stations. Corresponding reductions in the 90 EPNdB footprint area are estimated to vary from about 70 percent for the DC-9 to about 80 percent for the B727.

  16. Reduction of JT8D powered aircraft noise by engine refanning

    NASA Technical Reports Server (NTRS)

    Stitt, L. E.; Medeiros, A. A.

    1974-01-01

    The technical feasibility is described of substantially reducing the noise levels of existing JT8D powered aircraft by retrofitting the existing fleet with quieter refan engines and new acoustically treated nacelles. No major technical problems exist that preclude the development and installation of refanned engines on aircraft currently powered by the JT8D engine. The refan concept is technically feasible and provides calculated noise reductions of from 7 to 8 EPNdb for the B727-200 aircraft and from 10 to 12 EPNdb for the DC-9-32 aircraft at the FAR Part 36 measuring stations. These noise levels are lower than both the FAR Part 36 noise standards and the noise levels of the wide-body DC-10-10. Corresponding reductions in the 90 EPNdb footprint area are estimated to vary from about 70 percent for the DC-9 to about 80 percent for the B727.

  17. Observation of a Complex Multistage Transition in the JT-60U H-mode Edge

    SciTech Connect

    Kamiya, K.; Sakamoto, Y.; Matsunaga, G.; Kojima, A.; Urano, H.; Oyama, N.; Koide, Y.; Kamada, Y.; Ida, K.

    2010-07-23

    A complex multistage transition of the edge radial electric field is observed in JT-60U H-mode phase without edge localized mode. An interesting feature is that the poloidal rotation velocity of the carbon impurity ions changes in the later H-phase without a comparable change in the main ion pressure gradient, indicating a change in the parallel momentum (and particle) balance channel.

  18. Summary of TFTR (Tokamak Fusion Test Reactor) diagnostics, including JET (Joint European Torus) and JT-60

    SciTech Connect

    Hill, K.W.; Young, K.M.; Johnson, L.C.

    1990-05-01

    The diagnostic instrumentation on TFTR (Tokamak Fusion Test Reactor) and the specific properties of each diagnostic, i.e., number of channels, time resolution, wavelength range, etc., are summarized in tables, grouped according to the plasma parameter measured. For comparison, the equivalent diagnostic capabilities of JET (Joint European Torus) and the Japanese large tokamak, JT-60, as of late 1987 are also listed in the tables. Extensive references are given to publications on each instrument.

  19. Simulation of the Effect of Plasma Flows in DIII-D, JET, and JT-60U

    SciTech Connect

    Porter, G D; Rognlien, T D; Rensink, M E; Loarte, A; Asakura, N; Takenaga, H; Mathews, G

    2002-05-17

    The results of 2D fluid plasma simulations of the ion flow in the boundary plasma of DIII-D, JET, and JT-60U are reported. The model includes the effects of drifts and of impurity radiation using a multi-species model of intrinsic carbon impurities. Drift effects are important in determining the primary and impurity ion fluxes in the SOL and the private region, with ExB drifts dominant. Simulated parallel velocities are consistent with experimental measurement on the high field side of JT-60U, where the parallel flow is determined by ion sources. Simulated parallel velocities are significantly less than seen in experiment at the outer midplane of JT-60U, and at the top of JET where the flow is sensitive to poloidal variations of the turbulence driven transport, suggesting the velocity in these regions is determined by transport. Parallel flows are reversed by changing the direction of the ion VB drift relative to the X-point.

  20. 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.

  1. 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

  2. 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.

  3. 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

    ... From the Federal Register Online via the Government Printing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission J&T Hydro Company; H. Dean Brooks and W. Bruce Cox; Notice of Application... 30, 2009, J&T Hydro Company (transferor) and W. Dean Brooks, and H. Bruce Cox (transferees) filed...

  4. 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.

  5. 75 FR 27972 - Airworthiness Directives; Pratt & Whitney JT8D-9, -9A, -11, -15, -17, and -17R Turbofan Engines

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-05-19

    ... JT8D-9, -9A, -11, -15, -17, and -17R Turbofan Engines AGENCY: Federal Aviation Administration (FAA... airworthiness directive (AD) for Pratt & Whitney (PW) JT8D-9, -9A, -11, -15, -17, and -17R turbofan engines... Engineer, Engine Certification Office, FAA, Engine & Propeller Directorate, 12 New England Executive...

  6. 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.

  7. 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.

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

    NASA Astrophysics Data System (ADS)

    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.

    1997-11-01

    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 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.

  9. NASA refan program status. [for noise reduction of JT8D turbofan engine

    NASA Technical Reports Server (NTRS)

    Abdalla, K. L.; Yuska, J. A.

    1975-01-01

    The objective of the refan program is to demonstrate the technical feasibility of substantially reducing the noise levels of existing JT8D powered aircraft. The program consists of the design, manufacturing and testing of the refan engines and modified nacelles and airplanes. Experimental testing was completed for the refan engine both at sea level and at altitude conditions. Ground testing for the B727 side- and center-engine installations and flight testing of the DC-9 with refan engines and acoustic nacelles were performed. Preliminary results presented show that substantial noise reductions were achieved.

  10. 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.

  11. JT9D performance deterioration results from a simulated aerodynamic load test

    NASA Technical Reports Server (NTRS)

    Stakolich, E. G.; Stromberg, W. J.

    1981-01-01

    This paper presents the results of testing to identify the effects of simulated aerodynamic flight loads on JT9D engine performance. The test results were also used to refine previous analytical studies on the impact of aerodynamic flight loads on performance losses. To accomplish these objectives, a JT9D-7AH engine was assembled with average production clearances and new seals as well as extensive instrumentation to monitor engine performance, case temperatures, and blade tip clearance changes. A special loading device was designed and constructed to permit application of known moments and shear forces to the engine by the use of cables placed around the flight inlet. The test was conducted in the Pratt and Whitney Aircraft X-Ray Test Facility to permit the use of X-ray techniques in conjunction with laser blade tip proximity probes to monitor important engine clearance changes. Upon completion of the test program, the test engine was disassembled, and the condition of gas path parts and final clearances were documented. The test results indicate that the engine lost 1.1 percent in thrust specific fuel consumption (TSFC), as measured under sea level static conditions, due to increased operating clearances caused by simulated flight loads. This compares with 0.9 percent predicted by the analytical model and previous study efforts.

  12. JT9D performance deterioration results from a simulated aerodynamic load test

    NASA Technical Reports Server (NTRS)

    Stakolich, E. G.; Stromberg, W. J.

    1981-01-01

    The results of testing to identify the effects of simulated aerodynamic flight loads on JT9D engine performance are presented. The test results were also used to refine previous analytical studies on the impact of aerodynamic flight loads on performance losses. To accomplish these objectives, a JT9D-7AH engine was assembled with average production clearances and new seals as well as extensive instrumentation to monitor engine performance, case temperatures, and blade tip clearance changes. A special loading device was designed and constructed to permit application of known moments and shear forces to the engine by the use of cables placed around the flight inlet. The test was conducted in the Pratt & Whitney Aircraft X-Ray Test Facility to permit the use of X-ray techniques in conjunction with laser blade tip proximity probes to monitor important engine clearance changes. Upon completion of the test program, the test engine was disassembled, and the condition of gas path parts and final clearances were documented. The test results indicate that the engine lost 1.1 percent in thrust specific fuel consumption (TSFC), as measured under sea level static conditions, due to increased operating clearances caused by simulated flight loads. This compares with 0.9 percent predicted by the analytical model and previous study efforts.

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

    NASA Astrophysics Data System (ADS)

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

    1992-12-01

    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 more important with graphite surfaces, recycling characteristics of an all graphite first wall is important. In this paper, experimental results of JT-60U on recycling and helium ash removal are presented. The effect of wall temperature on recycling was observed. Significant hydrogen dilution was observed during deuterium discharges. Recycling characteristics in the ELMy H-mode discharges are also described where the neutral pressure increases with the electron density similar to L-mode discharges. In high ??/hot ion discharges, a highest neutron production rate of 1.3×10 16 s -1 was obtained with the lowest recycling. Initial results of helium ash experiment with strong He gas puffings in ohmically and neutral beam heated discharges are reported.

  14. 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.

  15. 76 FR 41144 - Airworthiness Directives; Pratt & Whitney Corp. (PW) JT9D-7R4H1 Turbofan Engines

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-07-13

    ...certain high-pressure compressor (HPC) shafts before their certified life limits, and...prompted by reports of cracks in five HPC shafts. We are proposing this AD to correct...JT9D-7R4H1 engines containing an HPC shaft with cracks in the thread grooves of...

  16. 76 FR 77107 - Airworthiness Directives; Pratt & Whitney Corp. (PW) JT9D-7R4H1 Turbofan Engines

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-12-12

    ... FR 41144). That NPRM proposed to require: For HPC shafts that have more than 4,500 cycles-since-new... Applicability paragraph clearly states that this AD applies only to the PW JT9D-7R4H1 turbofan engine model. All... consistent with the intent that was proposed in the NPRM (76 FR 41144, July 13, 2011) for correcting...

  17. Tritium Release Behavior from JT-60U Vacuum Vessel During Air Exposure Phase and Wall Conditioning Phase

    SciTech Connect

    Isobe, K.; Nakamura, H.; Kaminaga, A.; Higashijima, S.; Nishi, M.; Konishi, S.; Nishikawa, M.; Tanabe, T.

    2005-07-15

    The behavior of tritium release from the vacuum vessel of JT-60U during air exposure phase at controlled water vapor concentration and gas purging in the wall conditioning phase has been investigated. For the air exposure with varying water vapor concentrations of 40ppm, 300ppm, 680ppm and 3400ppm, tritium concentration in the vacuum vessel of JT-60U was measured. At each water vapor concentration, tritium concentration initially increased with time and then became steady finally. The steady tritium concentration increased with water vapor concentration. The total amount of tritium released from the vacuum vessel was 13MBq for 3400ppm. This amount is almost the same as that removed by 5 hours' H{sub 2}-GDC, which has been the most effective method for tritium removal from JT-60U. This suggests that tritium in the vacuum vessel of JT-60U can be easily removed by water vapor. Tritium released into exhaust gas during gas purging was also measured for varying gases (H{sub 2}, He and Ar), at different pressures and temperatures of the vacuum vessel. Tritium concentration of the exhaust gas was about 0.1Bq/cm{sup 3} at room temperature and was independent of gas species within the pressure from 0.05 to 0.3 Pa. This result indicates that isotope exchange of tritium with hydrogen molecules was not so active under these purge conditions.

  18. Dependence of pedestal structure on collisionality at fixed beta in JT-60U

    NASA Astrophysics Data System (ADS)

    Urano, H.; Aiba, N.; Kamiya, K.; Kamada, Y.; the JT-60 Team

    2016-01-01

    The dependence of pedestal structure on collisionality at fixed beta has been investigated in JT-60U. In the ITER-relevant low collisionality regime, the pedestal width does not change with edge collisionality. In the high collisionality regime, the pedestal width broadens with increased edge collisionality. The pedestal pressure gradient and width are not significantly changed when the pedestal is close to an intermediate n peeling-ballooning mode boundary at low collisionality. The experimental result indicates that conventional pedestal models where the pedestal width is independent of collisionality and is determined by {?\\text{p}} at the pedestal is not a bad assumption in the ITER-relevant low collisionality regime. On the other hand, the pressure gradient decreases and the pedestal width increases at high collisionality. The pedestal broadening becomes significant when the pedestal is marginal to be unstable at the high n ballooning mode in the high collisionality regime.

  19. Radial Patterns of Instability and Transport in JT-60U Internal Transport Barrier Discharges

    SciTech Connect

    G. Rewoldt; K.W. Hill; R. Nazikian; W.M. Tang; H Shirai; Y. Sakamoto; Y. Kishimoto; S.Ide; and T. Fujita

    2001-02-27

    One class of internal transport barrier discharges in the JT-60U tokamak is characterized by two relatively flatter regions of the pressure separated by a region with very large pressure gradient. Linear growth rates for toroidal drift-type modes are calculated for discharges in this class, without and with sheared E x B rotation effects. For cases with fully-developed barriers, the results with rotation are consistent with a picture in which the radial electric field generated in part by the steep pressure gradient causes local stabilization, and thus reduction of the local anomalous transport, which allows the steep pressure gradient to persist. If rotation is omitted from the calculation for these cases, or if rotation is included for cases without barriers or with partially developed barriers, the unstable region spreads into the steep pressure gradient region.

  20. 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.

  1. In-out asymmetry of low- Z impurity deposition on the JT-60U divertor tiles

    NASA Astrophysics Data System (ADS)

    Masaki, K.; Yagyu, J.; Miyo, Y.; Gotoh, Y.; Arai, T.; Hayashi, T.; Kodama, K.; Sasajima, T.; Kaminaga, A.; Tanabe, T.; Miya, N.

    2004-08-01

    Low- Z impurity ( 7Be) on the JT-60U divertor tiles was analyzed to study the impurity behavior in the divertor region. The amount of the 7Be increased approximately one hundred times after B 4C-tile installation in the outer divertor. The 7Be was probably produced by 10B(p,?) 7Be nuclear reaction on the divertor tiles in the hydrogen experiment with ion cyclotron range of frequency heating. The 7Be was distributed asymmetrically in the poloidal and the toroidal direction. The highest 7Be concentration was found at the inner divertor whose boron content (B/(B+C) ˜ 20%) was lower than the B 4C tiles (B/(B+C) ˜ 80%) of the outer divertor. This result may imply impurity transport from the outer divertor to the inner divertor.

  2. 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.

  3. Characteristics of the JT-60 divertor and limiter plasmas with high power auxiliary heating

    NASA Astrophysics Data System (ADS)

    JT-60 Team; Aikawa, H.; Akaoka, N.; Akasaka, H.; Akino, N.; Akiyama, T.; Ando, T.; Annoh, K.; Aoyagi, T.; Arai, T.; Arakawa, K.; Araki, M.; Azumi, M.; Chiba, S.; Dairaku, M.; Ebisawa, N.; Fujii, T.; Fukuda, T.; Funahashi, A.; Furukawa, H.; Hamamatsu, K.; Hanada, M.; Hara, M.; Haraguchi, K.; Hiratsuka, H.; Hirayama, T.; Hiroki, S.; Hiruta, K.; Honda, M.; Honda, M.; Horiike, H.; Hosoda, R.; Hosogane, N.; Iijima, T.; Ikeda, K.; Ikeda, Y.; Imai, T.; Inoue, T.; Isaji, N.; Isaka, M.; Ishida, S.; Itami, K.; Ichige, N.; Itoh, T.; Kakizaki, T.; Kaminaga, A.; Katoh, T.; Kawai, M.; Kawabe, M.; Kawamata, Y.; Kawasaki, K.; Kikuchi, K.; Kikuchi, M.; Kimura, H.; Kimura, T.; Kishimoto, H.; Kitamura, S.; Kitsunezaki, A.; Kiyono, K.; Kobayashi, N.; Kodama, K.; Koide, S.; Koide, Y.; Koike, T.; Komata, M.; Kondo, I.; Konoshima, S.; Kubo, H.; Kunieda, S.; Kurihara, K.; Kuriyama, M.; Kuroda, T.; Kusaka, M.; Kusama, Y.; Mabuchi, Y.; Maehara, S.; Maeno, K.; Matoba, T.; Matsuda, S.; Matsukawa, M.; Matsukawa, T.; Matsuoka, M.; Miura, Y.; Miya, N.; Miyachi, K.; Miyo, Y.; Mizuno, M.; Mori, M.; Moriyama, S.; Mutoh, M.; Nagami, M.; Nagashima, A.; Nagashima, K.; Nagashima, T.; Nagaya, S.; Naito, O.; Nakamura, H.; Nakamura, Y.; Nemoto, M.; Neyatani, Y.; Ninomiya, H.; Nishino, N.; Nishitani, T.; Obara, K.; Obinata, H.; Ogawa, Y.; Ogiwara, N.; Ohga, T.; Ohara, Y.; Ohasa, K.; Ohara, H.; Ohshima, T.; Ohkubo, M.; Ohsawa, S.; Ohta, K.; Ohta, M.; Ohtaka, M.; Ohuchi, Y.; Oikawa, A.; Okumura, H.; Okumura, Y.; Omori, K.; Omori, S.; Omori, Y.; Ozeki, T.; Saegusa, M.; Saitoh, N.; Sakamoto, K.; Sakasai, A.; Sakata, S.; Sasajima, T.; Satou, K.; Satou, M.; Satou, M.; Sakurai, A.; Sawahata, M.; Sebata, T.; Seimiya, M.; Seki, M.; Seki, S.; Shibanuma, K.; Shimada, R.; Shimada, T.; Shimizu, K.; Shimizu, M.; Shimomura, Y.; Shinozaki, S.; Shirai, H.; Shirakata, H.; Shitomi, M.; Suganuma, K.; Sugie, T.; Sugiyama, T.; Sunaoshi, H.; Suzuki, K.; Suzuki, M.; Suzuki, N.; Suzuki, N.; Suzuki, S.; Suzuki, Y.; Takahashi, M.; Takahashi, S.; Takahashi, T.; Takasaki, M.; Takatsu, H.; Takeuchi, H.; Takeshita, A.; Takizuka, T.; Tamura, S.; Tanaka, S.; Tani, K.; Terakado, M.; Terakado, T.; Tobita, K.; Tokutake, T.; Totsuka, T.; Toyoshima, N.; Tsuda, F.; Tsugita, T.; Tsuji, S.; Tsukahara, Y.; Tsuneoka, M.; Uehara, K.; Umehara, M.; Uramoto, Y.; Usami, H.; Ushigusa, K.; Usui, K.; Yagyu, J.; Yamagiwa, M.; Yamamoto, M.; Yamamoto, T.; Yamashita, O.; Yamazaki, T.; Yasukawa, T.; Yokokura, K.; Yokomizo, H.; Yokoyama, K.; Yoshikawa, K.; Yoshikawa, M.; Yoshida, H.; Yoshino, R.; Yoshioka, Y.; Yonekawa, I.; Yoneda, T.; Watanabe, K.; Bell, M. G.; Bickerton, R. J.; Engelhardt, W.; Goldston, R. J.; Ilne, E. K.; Kaline, J.; Kugel, H. W.; Mondino, P. L.; Soldner, F. X.; Takase, Y.; Thomas, P. R.; Wong, K. L.

    1989-04-01

    Essential divertor functions — density and energy control — have been investigated in the JT-60 divertor with metal walls. Neutral pressure in the divertor chamber increases in proportion to n¯2e and high recycling state for particle exhaust is realized. At overlinene ? 6 × 10 19m -3, wall pumping by the divertor plates is dominant in particle exhaust. However, at n¯e ? 6 × 10 19m -3, particle exhaust by active divertor pumping systems becomes essential. Because of the effectiveness of the divertor, radiation loss in the main plasma is reduced to 5-10% of the absorbed power and impurity concentrations are significantly suppressed at very low level ( Zeff = 1.5-2.0). In the experiments with graphite walls, short periods of H-mode phases were found in the outside X-point divertor discharges although improvement in energy confinement is limited to within 10%. In limiter discharges, combination of high vessel temperature (210-300 °C) and low current limiter discharges (1.5 MA) without gas puffing is effective as a wall conditioning in obtaining reproducible high density discharges. The maximum parameters, I p = 3.2 MA, n¯e = 1.2 × 10 20m -3, q eff = 2.2 at Bt = 4.8T, a Murakami parameter of 7.5, and a stored energy of 3.1 MJ have been attained. The maximum density is limited by the occurence of the MARFE. During high power neutral beam heating, enhanced carbon influx was observed possibly due to chemical sputtering. The wall pumping by the inner wall is still effective in decreasing the electron density from the high density region of n¯e 1 × 10 20m -3. An empirical energy confinement scaling of JT-60 has been drawn in terms of an offset linear function as ? E = {0.19 I 1.9P}/{P abs} + 0.062 a 1.8p

  4. Comparison of several inflow control devices for flight simulation of fan tone noise using a JT15D-1 engine

    NASA Technical Reports Server (NTRS)

    Mcardie, J. G.; Jones, W. L.; Heidelberg, L. J.; Homyak, L.

    1980-01-01

    The paper describes the tests of four devices intended to reduce inflow disturbances and turbulences using a JT15D-1 turbofan engine. The tests were made to simulate the in-flight fan tone noise; the inflow control devices (ICD's) consisted of honeycomb/screen structures mounted over the engine inlet. The ICD's ranged from 1.6 to 4 fan diameters in size, and were made with several fabrication methods. All the ICD's significantly reduced the BPF tone in the far-field directivity patterns, but the smallest ICD's introduced propagating modes which could be recognized by additional lobes in the patterns. The JT15D-1 engine had a tone source which generated a strong propagating mode at fan speeds corresponding to 'approach' power and higher. Data from a typical transducer showed that the unsteady inflow distortion modes were eliminated or reduced when either of the ICD's was installed.

  5. 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.

  6. Modelling of the fin type heat exchanger for the HTS current leads of W7-X and JT-60SA

    NASA Astrophysics Data System (ADS)

    Heller, R.; Class, A.; Batta, A.; Lietzow, R.; Neumann, H.; Tischmacher, M.

    2010-03-01

    The Forschungszentrum Karlsruhe has taken over the responsibility for the design, construction and testing of the high temperature superconductor (HTS) current leads for two fusion experiments, i.e. the stellarator Wendelstein 7-X (W7-X) and the satellite tokamak JT-60SA. One important task for the design of the HTS current lead is the heat exchanger (HEX). In the current leads for W7-X and JT-60SA the HEX consists of the central conductor with meander flow fins to achieve a cross flow HEX. A design optimisation requires the knowledge of the heat transfer characteristics of the HEX. Therefore, 3D CFD simulations were performed to compute local Nusselt and Reynolds numbers. From the CFD results a 1D system code description and heat transfer correlations have been deduced. This paper describes the 3D-CFD and 1D system code as well as the results of the numerical calculations. The results were validated using experimental results of HEX mock-ups. The model was extended to the HEX covering the temperature range between 60 K and room temperature leading to a single Nusselt-Reynolds number correlation. Finally the parameters for optimised HTS current leads for W7-X and JT-60SA are presented.

  7. Long term hydrogen retention in the plasma facing carbon tiles of JT-60U

    NASA Astrophysics Data System (ADS)

    Yoshida, Masafumi; Tanabe, Tetsuo; Sugiyama, Kazuyoshi; Hayashi, Takao; Nakano, Tomohide; Yagyu, Junnichi; Miyo, Yasuhiko; Masaki, Kei; Itami, Kiyoshi

    2011-10-01

    In order to investigate how fuel (H + D) retention increases with discharge time, we have measured long term H + D retention of the carbon tiles exposed to plasmas in JT-60U by TDS and SEM. The H + D retention in the re-deposited carbon layers on divertor tiles linearly increases with the thickness of the re-deposited layers with a constant hydrogen concentration of (H + D)/C ˜ 0.013. The C-deposition and H + D retention rates are in the order of ˜1 × 10 20 C/m 2/s and ˜3.8 × 10 18 H + D atoms/m 2/s, respectively. The H + D retentions in the near surface regions of eroded tiles both at outer divertor and outer first wall did not go over 5 × 10 22 H + D atoms/m 2, suggesting hydrogen saturation at the near surface regions. However, in a little deeper region of the outer first wall tiles, direct implantation of energetic D originated from Neutral Beam Injection (NBI) caused gradual increase of the retention until saturation in the implanted depth.

  8. Retention of Hydrogen Isotopes in Divertor Tiles Used in JT-60U

    SciTech Connect

    Hirohata, Y.; Shibahara, T.; Tanabe, T.; Oya, Y.; Arai, T.; Gotoh, Y.; Masaki, K.; Yagyu, J.; Oyaidzu, M.; Okuno, K.; Nishikawa, M.; Miya, N.

    2005-07-15

    Retention characteristics of deuterium and hydrogen retained in graphite tiles placed in the divertor region of JT-60U were investigated by thermal desorption spectroscopy (TDS). The deuterium retained in the near surface of all graphite tiles was mostly replaced by hydrogen due to exposure to hydrogen plasma at the final stage operations, resulting in main deuterium retention in the deeper region. The dominant species desorbed from the divertor tiles were H{sub 2}, HD, D{sub 2} and CH{sub 4}. The smallest retention of hydrogen isotopes (H+D) was observed in the outer divertor tile which was eroded with maximum of 20 {mu}m depth. The amount of H+D retained in the inner divertor tiles covered by the re-deposited layers increased with the thickness of the re-deposited layers. Hydrogen isotopes concentration ((H+D)/C) in the re-deposited layers was {approx}0.02, which was much smaller than those observed in JET and other devices.

  9. Progress of Negative Ion Source Improvement in N-NBI for JT-60U

    SciTech Connect

    Kawai, M.; Akino, N.; Ebisawa, N.; Grisham, L.; Hanada, M.; Honda, A.; Inoue, T.; Kazawa, M.; Kikuchi, K.; Kuriyama, M.; Kusanagi, N.; Mogaki, K.; Noto, K.; Ohga, T.; Ooshima, K.; Tanai, Y.; Umeda, N.; Usui, K.; Yamamoto, T.; Yamazaki, H.; Watanabe, K.

    2003-09-15

    The negative-ion based neutral beam injection system developed by JAERI for JT-60U has been intended to generate a 500 keV and 10 MW beam for 10 seconds with two ion sources. Technical efforts to decrease heat loads on the accelerator grids, to improve non-uniformity of the source plasma, to increase voltage holding of the accelerator, and to optimize the operational parameters have been conducted intensively. A step-down control of the filament voltage was very effective to keep the acceleration current constant during the pulse duration. To suppress degradation of voltage holding of the accelerator, protection spark gaps of {approx}178 kV for each stage, its gap length is 73 mm, were confirmed to be effective.As results of these improvements, as of June 2002, the maximum injection power has reached 6.2 MW, and a pulse length has attained 10 seconds of the design value with a 2.6 MW beam.

  10. Performance deterioration due to acceptance testing and flight loads; JT90 jet engine diagnostic program

    NASA Technical Reports Server (NTRS)

    Olsson, W. J.

    1982-01-01

    The results of a flight loads test of the JT9D-7 engine are presented. The goals of this test program were to: measure aerodynamic and inertia loads on the engine during flight, explore the effects of airplane gross weight and typical maneuvers on these flight loads, simultaneously measure the changes in engine running clearances and performance resulting from the maneuvers, make refinements of engine performance deterioration prediction models based on analytical results of the tests, and make recommendations to improve propulsion system performance retention. The test program included a typical production airplane acceptance test plus additional flights and maneuvers to encompass the range of flight loads in revenue service. The test results indicated that aerodynamic loads, primarily at take-off, were the major cause of rub-indicated that aerodynamic loads, primarily at take-off, were the major cause of rub-induced deterioration in the cold sectin of the engine. Differential thermal expansion between rotating and static parts plus aerodynamic loads combined to cause blade-to-seal rubs in the turbine.

  11. Fuelling characteristics of supersonic molecular beam injection in JT-60U

    NASA Astrophysics Data System (ADS)

    Takenaga, H.; Miyo, Y.; Bucalossi, J.; Marty, V.; Urano, H.; Asakura, N.; Nishiyama, T.; Sasajima, T.; Masaki, K.; Kaminaga, A.

    2010-11-01

    Supersonic molecular beam injection (SMBI) was successfully operated in JT-60U after improving the performance of the vacuum seal used inside the injector head. Frequent density jumps were clearly observed in the main plasma against the SMBI pulses with filling gas pressures (PFG) of 0.2-0.6 MPa. The fuelling efficiency exhibited a weak dependence on PFG and the injection direction (high- and low-field-side injections). The amount of fuelling necessary for achieving the same density level is much smaller for SMBI than for gas puffing. It is comparable for SMBI and pellet injection even with shallower penetration of SMBI as discussed. The SMBI ionization area was estimated based on emission measured using a fast TV camera with a time resolution of 0.167 ms. The estimations indicated a similar penetration position for PFG = 0.6 and 0.2 MPa, although the ionization area was larger for 0.6 MPa. This result supports the weak PFG dependence of the fuelling efficiency. The front of the ionization area moved between the first and second frames of the fast TV camera and it reached just inside the separatrix in the second frame. The ionization area was significantly expanded even in the first frame from the expected SMB size and the expansion was enhanced in the second frame. These relatively slow changes between the two frames suggest that the interaction between the SMB and the plasma significantly influences the fuelling characteristics.

  12. 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).

  13. Gaseous exhaust emissions from a JT8D-109 turbofan engine at simulated cruise flight conditions

    NASA Technical Reports Server (NTRS)

    Diehl, L. A.; Holdeman, J. D.

    1975-01-01

    Gaseous emissions from a JT8D-109 turbofan engine were measured in an altitude facility at four simulated cruise flight conditions: Mach 0.8 at altitudes of 9.1, 10, 7, and 12.2 km and Mach 0.9 at 10.7 km. Engine inlet air temperature was held constant at 283 K for all tests. Emissions measurements were made at nominally 6 cm intervals across the horizontal diameter of the engine exhaust nozzle with a single-point traversing gas sample probe. Measured emissions of decreased with increasing altitude from an emission index of 10.4 to one of 8.3, while carbon monoxide increased with increasing altitude from an emission index of 1.6 to one of 4.4. Unburned hydrocarbon emissions were essentially negligible for all flight conditions. Since the engine inlet air temperatures were not correctly simulated, the NOx emission indices were corrected to true altitude conditions by using correlating parameters for changes in combustor inlet temperature, pressure, and temperature rise. The correction was small at the lowest altitude. At the 10.7 and 12.2 km, Mach 0.8 test conditions the correction decreased the measured values by 1 emission index.

  14. Performance deterioration based on existing (historical) data; JT9D jet engine diagnostics program

    NASA Technical Reports Server (NTRS)

    Sallee, G. P.

    1978-01-01

    The results of the collection and analysis of historical data pertaining to the deterioration of JT9D engine performance are presented. The results of analyses of prerepair and postrepair engine test stand performance data from a number of airlines to establish the individual as well as average losses in engine performance with respect to service use are included. Analysis of the changes in mechanical condition of parts, obtained by inspection of used gas-path parts of varying age, allowed preliminary assessments of component performance deterioration levels and identification of the causitive factors. These component performance estimates, refined by data from special engine back-to-back testing related to module performance restoration, permitted the development of preliminary models of engine component/module performance deterioration with respect to usage. The preliminary assessment of the causes of module performance deterioration and the trends with usage are explained, along with the role each module plays in overall engine performance deterioration. Preliminary recommendations with respect to operating and maintenance practices which could be adopted to control the level of performance deterioration are presented. The needs for additional component sensitivity testing as well as outstanding issues are discussed.

  15. 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.

  16. The 110-GHz Electron Cyclotron Range of Frequency System on JT-60U: Design and Operation

    SciTech Connect

    Ikeda, Y.; Kasugai, A.; Moriyama, S.; Kajiwara, K.; Seki, M.; Tsuneoka, M.; Takahashi, K.; Anno, K.; Hamamatsu, K.; Hiranai, S.; Ikeda, Yu.; Imai, T.; Sakamoto, K.; Shimono, M.; Shinozaki, S.; Terakado, M.; Yamamoto, T.; Yokokura, K.; Fujii, T.

    2002-09-15

    The electron cyclotron range of frequency (ECRF) system was designed and operated on the JT-60U to locally heat and control plasmas. The frequency of 110 GHz was adopted to inject the fundamental O-mode from the low field side with an oblique injection angle. The system is composed of four 1 MW-level gyrotrons, four transmission lines, and two antennae. The gyrotron is featured by a collector potential depression (CPD) and a gaussian beam output through a diamond window. The CPD enables JAERI to drive the gyrotron under the condition of the main DC voltage of 60 kV without a thyristor regulation. The gaussian mode from the gyrotron is effectively transformed to HE{sub 11} mode in the 31.75 mm diameter corrugated waveguide. About 75% of the output power of the gyrotrons can be injected into plasmas through the waveguides about 60 m in length. There are two antennae to control the deposition position of the EC wave during a plasma discharge. One is connected with three RF lines to steer the EC beams in the poloidal direction. The other is to control the EC beam in the toroidal and poloidal directions by two steerable mirrors.On the operation in 2000, the power of 1.5 to 1.6 MW for 3 s was successfully injected into plasmas using three gyrotrons. Local profile control was demonstrated by using the antennae. This capability was devoted to improve the plasma performance such as high T{sub e} production more than 15 keV and suppression of the MHD activities. In 2001, the fourth gyrotron, whose structure was improved for long pulse operation, has been installed for a total injection power of {approx}3 MW.

  17. Expanded study of feasibility of measuring in-flight 747/JT9D loads, performance, clearance, and thermal data

    NASA Technical Reports Server (NTRS)

    Sallee, G. P.; Martin, R. L.

    1980-01-01

    The JT9D jet engine exhibits a TSFC loss of about 1 percent in the initial 50 flight cycles of a new engine. These early losses are caused by seal-wear induced opening of running clearances in the engine gas path. The causes of this seal wear have been identified as flight induced loads which deflect the engine cases and rotors, causing the rotating blades to rub against the seal surfaces, producing permanent clearance changes. The real level of flight loads encountered during airplane acceptance testing and revenue service and the engine's response in the dynamic flight environment were investigated. The feasibility of direct measurement of these flight loads and their effects by concurrent measurement of 747/JT9D propulsion system aerodynamic and inertia loads and the critical engine clearance and performance changes during 747 flight and ground operations was evaluated. A number of technical options were examined in relation to the total estimated program cost to facilitate selection of the most cost effective option. It is concluded that a flight test program meeting the overall objective of determining the levels of aerodynamic and inertia load levels to which the engine is exposed during the initial flight acceptance test and normal flight maneuvers is feasible and desirable. A specific recommended flight test program, based on the evaluation of cost effectiveness, is defined.

  18. Numerical Simulation of a High-Brightness Lithium Ion Gun for a Zeeman Polarimetry on JT-60U

    NASA Astrophysics Data System (ADS)

    Kojima, Atsushi; Kamiya, Kensaku; Iguchi, Harukazu; Fujita, Takaaki; Kamada, Yutaka

    A lithium ion gun is under construction for a lithium beam Zeeman polarimetry on JT-60U. The performance of the prototype ion gun has been estimated by the numerical simulation taking the space charge effects into account. The target values of the ion gun are the beam energy of 30 keV, the beam current of 10 mA and the beam divergence angle within 0.13 degrees. The low divergence of 0.13 degrees is required for the geometry of the Zeeman polarimetry on JT-60U where the observation area is 6.5 m away from the neutralizer. The numerical simulation needs to be carried out for the design study because the requirement of the divergence angle is severe for the development of the high-brightness ion gun. The simulation results show the beam loss of 50 % caused by the clash to the electrode such as the cathode and the neutralizer. Moreover, the beam transport efficiency from the neutralizer to the observation area is low due to the broadening of the divergence angle. The total beam efficiency is about 5 %. Extracted beam profile affects the beam focusing and the efficiency. The peaked profile achieves better efficiency than the hollow one. As a result, beam current of 1 mA is obtained at the observation area by the simulation for the prototype ion gun.

  19. 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

  20. 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.

  1. Silicon Germanium Epitaxy: A New Material For MEMS J.T. Borenstein*, N.D. Gerrish*, R. White*, M.T. Currie** And E.A. Fitzgerald**

    E-print Network

    White, Robert D.

    Silicon Germanium Epitaxy: A New Material For MEMS J.T. Borenstein*, N.D. Gerrish*, R. White*, M-thick bulk structures. Here we present the latest fabrication results for epitaxial silicon-germanium alloys applications, silicon-germanium alloy layers are grown using a graded buffer approach, resulting in very high

  2. The Magnetic Connectivity of Moss Regions X.P. Zhao, J.T. Hoeksema, A.G. Kosovichev, R. Bush and P.H. Scherrer

    E-print Network

    Zhao, Xuepu

    The Magnetic Connectivity of Moss Regions X.P. Zhao, J.T. Hoeksema, A.G. Kosovichev, R. Bush and P ; accepted #12; { 2 { ABSTRACT A novel emission feature resembling moss was #12;rst identi#12;ed in high resolution TRACE Fe IX/X 171 #23; A images by Berger et al. (1999). The moss emission is characterized

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

    SciTech Connect

    Gupta, Prabhat Kumar; Rabehl, Roger

    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.

  4. Evaluation of two inflow control devices for flight simulation of fan noise using a JT15D engine

    NASA Technical Reports Server (NTRS)

    Jones, W. L.; Mcardle, J. G.; Homyak, L.

    1979-01-01

    Two inflow control devices, (ICD's) one in-duct and the other external to the duct, were tested on a JT15D engine to determine their ability to remove inflow turbulence without altering the sound transmission to the far field. The objective of the program was to develop means of accurately simulating flight fan noise on ground static test stands. The results generally indicated that both the in-duct and external ICD's were effective in reducing the inflow turbulence and the fan blade passing frequency tone generated by the turbulence. The external ICD was essentially transparent to the propagating fan tone but the in-duct ICD caused attenuation under most conditions.

  5. Comparison of several inflow control devices for flight simulation of fan tone noise using a JT15D-1 engine

    NASA Technical Reports Server (NTRS)

    Mcardle, J. G.; Jones, W. L.; Heidelberg, L. J.; Homyak, L.

    1980-01-01

    To enable accurate simulation of in-flight fan tone noise during ground static tests, four devices intended to reduce inflow disturbances and turbulence were tested with a JT15D-1 turbofan engine. These inflow control devices (ICD's) consisted of honeycomb/screen structures mounted over the engine inlet. The ICD's ranged from 1.6 to 4 fan diameters in size, and differed in shape and fabrication method. All the ICD's significantly reduced the BPF tone in the far-field directivity patterns, but the smallest ICD's apparently introduced propagating modes which could be recognized by additional lobes in the speeds; at supersonic fan tip speed the smallest ICD's had some measurable loss, but the largest had no loss. Data from a typical transducer show that the unsteady inflow distortion modes (turbulence) were eliminated or significantly reduced when either of the ICD's was installed. However, some steady inflow distortion modes remained.

  6. JT9D-70/59 Improved High Pressure Turbine Active Clearance Control System. [for specific fuel consumption improvement

    NASA Technical Reports Server (NTRS)

    Gaffin, W. O.

    1979-01-01

    The JT9D-70/59 high pressure turbine active clearance control system was modified to provide reduction of blade tip clearance when the system is activated during cruise operation. The modification increased the flow capacity and air impingement effectiveness of the cooling air manifold to augment turbine case shrinkage capability, and increased responsiveness of the airseal clearance to case shrinkage. The simulated altitude engine testing indicated a significant improvement in specific fuel consumption with the modified system. A 1000 cycle engine endurance test showed no unusual wear or performance deterioration effects on the engine or the clearance control system. Rig tests indicated that the air impingement and seal support configurations used in the engine tests are near optimum.

  7. Quality evaluation of graphites and carbon/carbon composites during production of JT-60U plasma facing materials

    NASA Astrophysics Data System (ADS)

    Ando, T.; Kodama, K.; Yamamoto, M.; Arai, T.; Kaminaga, A.; Horiike, H.; Eto, M.; Fukaya, K.; Kiuchi, T.; Teruyama, K.; Nanai, I.; Hanai, S.; Ninomiya, S.; Tezuka, M.

    1992-09-01

    The variations of physical and mechanical properties have been investigated for three grades of isotropic graphites and four grades of carbon/carbon (C/C) composites on the basis of the sample inspection data which have been obtained during production of the first wall and divertor plate materials for JAERI Tokamak-60 Upgrade (JT-60U). The evaluated properties are density, electrical resistivity, coefficient of thermal expansion (CTE), thermal conductivity, bending, tensile and compressive strengths. It is found that the maximum standard deviations normalized by the mean values are 22.7% for the C/C composites and 9.2% for the isotropic graphites. This scatter of the material quality should be considered in the design of the isotropic graphite and C/C composite armor tiles. Correlations between these properties are also observed for several materials.

  8. 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.

    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.

  9. 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

    ... with FAA personnel concerning this proposed AD. Using the search function of the Web site, anyone can... JT8D-7, -7A, -7B, -9, - 9A, -11, -15, -15A, -17, -17A, -17R, and -17AR Series Turbofan Engines AGENCY..., -1A, -1B, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, and -17AR series turbofan...

  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. 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.

  12. 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.

    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.

  13. 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.

    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.

  14. The effect of the electron temperature and current density profiles on the plasma current decay in JT-60U disruptions

    NASA Astrophysics Data System (ADS)

    Shibata, Y.; Isayama, A.; Miyamoto, S.; Kawakami, S.; Watanabe, K. Y.; Matsunaga, G.; Kawano, Y.; Lukash, V. E.; Khayrutdinov, R. R.; the JT-60 Team

    2014-04-01

    The plasma current decay during the initial phase of the current quench in JT-60U disruption has been calculated by a disruption simulation code (DINA) using the measured electron temperature Te profile. In the case of fast plasma current decay, Te has a peaked profile immediately after a thermal quench and the Te profile does not change significantly during the initial phase of the current quench. On the other hand, in the case of a slow plasma current decay, the Te profile is broader immediately after the thermal quench, and the Te profile shrinks. The results of the DINA simulation show that the plasma internal inductance Li increases during the initial phase of the current quench, whereas the plasma external inductance Le does not change over time. If the plasma is represented by a simple electrical circuit, the time derivative of Li functions as a resistance on the plasma current decay. It was confirmed that the increase in Li is caused by current diffusion toward the core plasma due to the decrease in Te in the intermediate and edge regions.

  15. Surface discharge related properties of fiberglass reinforced plastic insulator for use in neutral beam injector of JT-60U

    SciTech Connect

    Yamano, Y.; Takahashi, M.; Kobayashi, S.; Hanada, M.; Ikeda, Y.

    2008-02-15

    Neutral beam injection (NBI) used for JT-60U is required to generate negative ions of 500 keV energies. To produce such high-energy ions, three-stage electrostatic accelerators consisting of three insulator rings made of fiberglass reinforced plastic (FRP) are applied. The surface discharges along FRP insulators are one of the most serious problems in the development of NBI. To increase the hold-off voltage against surface flashover events, it is necessary to investigate the FRP insulator properties related to surface discharges in vacuum. This paper describes surface flashover characteristics for FRP and alumina samples under vacuum condition. The results show that the fold-off voltages for FRP samples are inferior to those of alumina ceramics. In addition, measurement results of surface resistivity and volume resistivity under vacuum and atmospheric conditions, secondary electron emission characteristics, and cathodoluminescence under some keV electron beam irradiation are also reported. These are important parameters to analyze surface discharge of insulators in vacuum.

  16. Aerodynamic performance of 0.4066-scale model of JT8D refan stage with S-duct inlet

    NASA Technical Reports Server (NTRS)

    Moore, R. D.; Kovich, G.; Lewis, G. W., Jr.

    1977-01-01

    A scale model of the JT8D refan stage was tested with a scale model of the S-duct inlet design for the refanned Boeing 727 center engine. Detailed survey data of pressures, temperatures, and flow angles were obtained over a range of flows at speeds from 70 to 97 percent of design speed. Two S-duct configurations were tested; one with a bellmouth inlet and the other with a flight lip inlet. The results indicated that the overall performance was essentially unaffected by the distortion generated by the S-duct inlet. The stall weight flow increased by less than 0.5 kg/sec (approximately 1.5% of design flow) with the S-duct inlet compared with that obtained with uniform flow. The detailed measurements indicated that the inlet guide vane (IGV) significantly reduced circumferential variations. For example, the flow angles ahead of the IGV were positive in the right half of the inlet and negative in the left half. Behind the IGV, the flow angles tended to be more uniform circumferentially.

  17. The characteristics of the internal transport barrier under reactor relevant conditions in JT-60U weak shear plasmas

    NASA Astrophysics Data System (ADS)

    Takenaga, H.; Oyama, N.; Urano, H.; Sakamoto, Y.; Asakura, N.; Kamiya, K.; Miyo, Y.; Nishiyama, T.; Sasajima, T.; Masaki, K.; Kaminaga, A.; Ichige, H.; Bucalossi, J.; Marty, V.; Ide, S.; Koide, Y.; Kamada, Y.; JT-60 Team

    2009-07-01

    The characteristics of the internal transport barrier (ITB) have been investigated under reactor relevant conditions with edge fuelling and electron heating in JT-60U weak shear plasmas. In order to investigate the effects of edge fuelling and electron heating separately, two independent classes of experiments were performed, i.e. one with edge fuelling and ion dominant heating and the other with central beam fuelling and additional electron heating. High confinement was sustained at high density with edge fuelling by shallow pellet injection or supersonic molecular beam injection. The ion temperature (Ti) in the central region inside the ITB decreased due to cold pulse propagation even with edge fuelling. By optimizing the injection frequency and the penetration depth, the decreased central Ti recovered and a good ITB was sustained with enhanced pedestal pressure. The Ti-ITB also degraded significantly with electron cyclotron heating (ECH), when the stiffness feature was strong in the electron temperature (Te) profile. The ion thermal diffusivity in the ITB region increased with the electron thermal diffusivity, indicating the existence of a clear relation between ion and electron thermal transport. On the other hand, the Ti-ITB remained unchanged or even grew, when the stiffness feature was weak in the Te profile. The density fluctuation level at the ITB seemed unchanged during ECH; however, the correlation length became longer in the Ti-ITB degradation case and shorter in the Ti-ITB unchanging case.

  18. Detailed in situ laser calibration of the infrared imaging video bolometer for the JT-60U tokamak

    SciTech Connect

    Parchamy, H.; Peterson, B. J.; Konoshima, S.; Hayashi, H.; Seo, D. C.; Ashikawa, N

    2006-10-15

    The infrared imaging video bolometer (IRVB) in JT-60U includes a single graphite-coated gold foil with an effective area of 9x7 cm{sup 2} and a thickness of 2.5 {mu}m. The thermal images of the foil resulting from the plasma radiation are provided by an IR camera. The calibration technique of the IRVB gives confidence in the absolute levels of the measured values of the plasma radiation. The in situ calibration is carried out in order to obtain local foil properties such as the thermal diffusivity {kappa} and the product of the thermal conductivity k and the thickness t{sub f} of the foil. These quantities are necessary for solving the two-dimensional heat diffusion equation of the foil which is used in the experiments. These parameters are determined by comparing the measured temperature profiles (for kt{sub f}) and their decays (for {kappa}) with the corresponding results of a finite element model using the measured HeNe laser power profile as a known radiation power source. The infrared camera (Indigo/Omega) is calibrated by fitting the temperature rise of a heated plate to the resulting camera data using the Stefan-Boltzmann law.

  19. Long-pulse production of high current negative ion beam by using actively temperature controlled plasma grid for JT-60SA negative ion source

    SciTech Connect

    Kojima, A.; Hanada, M.; Yoshida, M.; Umeda, N.; Hiratsuka, J.; Kashiwagi, M.; Tobari, H.; Watanabe, K.; Grisham, L. R.

    2015-04-08

    The temperature control system of the large-size plasma grid has been developed to realize the long pulse production of high-current negative ions for JT-60SA. By using this prototype system for the JT-60SA ion source, 15 A negative ions has been sustained for 100 s for the first time, which is three times longer than that obtained in JT-60U. In this system, a high-temperature fluorinated fluid with a high boiling point of 270 degree Celsius is circulated in the cooling channels of the plasma grids (PG) where a cesium (Cs) coverage is formed to enhance the negative ion production. Because the PG temperature control had been applied to only 10% of the extraction area previously, the prototype PG with the full extraction area (110?cm × 45?cm) was developed to increase the negative ion current in this time. In the preliminary results of long pulse productions of high-current negative ions at a Cs conditioning phase, the negative ion production was gradually degraded in the last half of 100 s pulse where the temperature of an arc chamber wall was not saturated. From the spectroscopic measurements, it was found that the Cs flux released from the wall might affect to the negative ion production, which implied the wall temperature should be kept low to control the Cs flux to the PG for the long-pulse high-current production. The obtained results of long-pulse production and the PG temperature control method contributes the design of the ITER ion source.

  20. Long-pulse production of high current negative ion beam by using actively temperature controlled plasma grid for JT-60SA negative ion source

    NASA Astrophysics Data System (ADS)

    Kojima, A.; Hanada, M.; Yoshida, M.; Umeda, N.; Hiratsuka, J.; Kashiwagi, M.; Tobari, H.; Watanabe, K.; Grisham, L. R.

    2015-04-01

    The temperature control system of the large-size plasma grid has been developed to realize the long pulse production of high-current negative ions for JT-60SA. By using this prototype system for the JT-60SA ion source, 15 A negative ions has been sustained for 100 s for the first time, which is three times longer than that obtained in JT-60U. In this system, a high-temperature fluorinated fluid with a high boiling point of 270 degree Celsius is circulated in the cooling channels of the plasma grids (PG) where a cesium (Cs) coverage is formed to enhance the negative ion production. Because the PG temperature control had been applied to only 10% of the extraction area previously, the prototype PG with the full extraction area (110 cm × 45 cm) was developed to increase the negative ion current in this time. In the preliminary results of long pulse productions of high-current negative ions at a Cs conditioning phase, the negative ion production was gradually degraded in the last half of 100 s pulse where the temperature of an arc chamber wall was not saturated. From the spectroscopic measurements, it was found that the Cs flux released from the wall might affect to the negative ion production, which implied the wall temperature should be kept low to control the Cs flux to the PG for the long-pulse high-current production. The obtained results of long-pulse production and the PG temperature control method contributes the design of the ITER ion source.

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

    NASA Astrophysics Data System (ADS)

    Mehta, R. N.; Bapat, S. L.; Atrey, M. D.

    2014-01-01

    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.

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

    SciTech Connect

    Mehta, R. N.; Bapat, S. L.; Atrey, M. D.

    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.

  3. Performance of B 4C-converted carbon fiber composites in high power neutral beam heated divertor discharges in JT-60U

    NASA Astrophysics Data System (ADS)

    Ando, T.; Masaki, K.; Kodama, K.; Arai, T.; Tsuji, S.; Sugie, T.; Kubo, H.; Higashijima, S.; Hosogane, N.; Shimada, M.; Yagyu, J.; Kaminaga, A.; Sasajima, T.; Ouchi, Y.; Koike, T.; Shimizu, M.

    1995-04-01

    B 4C conversion-coated carbon fiber composites (B 4C-converted CFC) have been installed on the outboard strike point of the divertor plate in JT-60U to form a complete toroidal ring. Theplasma-surface interactions of the B 4C-converted CFC have been investigated in high power divertor operation with neutral beam (NB) heating power of ˜ 30 MW for 2 s. It is found that the carbon impurity is reduced without a significant increase of the boron impurity using a 100 ?m thick B 4C layer with a B/C ratio of 2.7. The oxygen impurity is reduced significantly by the evaporation of a 300 ?m thick B 4C layer with a B/C ratio of 3.8. A reduction in the detrimental effects on plasma-surface interactions with carbon-based materials has been demonstrated for more than 1000 shots by the use of surface-boronized carbon tiles in JT-60U.

  4. 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.

  5. Temporal and spatial responses of temperature, density and rotation to electron cyclotron heating in JT-60U

    NASA Astrophysics Data System (ADS)

    Yoshida, M.; Ide, S.; Takenaga, H.; Honda, M.; Urano, H.; Kobayashi, T.; Nakata, M.; Miyato, N.; Kamada, Y.

    2013-08-01

    The temporal and spatial responses of electron channels (the electron density, ne, and the electron temperature, Te) and ion channels (the ion temperature, Ti, and the toroidal rotation velocity, V?) to central electron cyclotron heating (ECH) have been investigated in positive shear H-mode plasmas with a relatively peaked Ti profile and internal transport barrier (ITB) plasmas on JT-60U. Ion temperature decreases with ECH after the increase in the electron temperature in the core region. The time scale of the change in Ti is ?30-60 ms in H-mode plasmas and almost constant in radius. In ITB plasmas, the time scale is shorter around the ITB foot and becomes longer inside the ITB foot. The experimentally measured causality indicates that the decrease in Ti is consistent with the ion temperature gradient critical gradient reduction. This is also verified through a comparison with linear gyrokinetic stability analyses. The electron heat diffusivity increases with ECH in both H-mode and ITB plasmas, correlating to the increase in the ion heat diffusivity. Electron density with a relatively flat ne profile does not decrease with ECH. On the other hand, the electron density with a peaked ne profile decreases with ECH. The flattening of the ne profile is observed after the increase in the electron temperature in the core region. The time scale of the change in ne is about 200-350 ms. Linear gyrokinetic stability analyses imply that the growth rate of the trapped electron modes, which increase outward particle flux, becomes more pronounced during ECH. The counter intrinsic rotation with ECH is identified on H-mode plasmas with a small torque input (BAL-NBI). The counter intrinsic rotation is generated after the increase in the electron temperature and correlates to the change in the electron temperature with ECH around the EC deposition. The radial region where the counter intrinsic rotation is observed is wider than the radial region where the electron temperature varies with ECH. The time scale of the change in the toroidal rotation velocity is about 90-200 ms around the ECH deposition and longer than the time scale of the change in Te and Ti.

  6. Dynamics of energetic particle driven modes and MHD modes in wall-stabilized high-? plasmas on JT-60U and DIII-D

    NASA Astrophysics Data System (ADS)

    Matsunaga, G.; Okabayashi, M.; Aiba, N.; Boedo, J. A.; Ferron, J. R.; Hanson, J. M.; Hao, G. Z.; Heidbrink, W. W.; Holcomb, C. T.; In, Y.; Jackson, G. L.; Liu, Y. Q.; Luce, T. C.; McKee, G. R.; Osborne, T. H.; Pace, D. C.; Shinohara, K.; Snyder, P. B.; Solomon, W. M.; Strait, E. J.; Turnbull, A. D.; Van Zeeland, M. A.; Watkins, J. G.; Zeng, L.; the DIII-D Team; the JT-60 Team

    2013-12-01

    In the wall-stabilized high-? plasmas in JT-60U and DIII-D, interactions between energetic particle (EP) driven modes (EPdMs) and edge localized modes (ELMs) have been observed. The interaction between the EPdM and ELM are reproducibly observed. Many EP diagnostics indicate a strong correlation between the distorted waveform of the EPdM and the EP transport to the edge. The waveform distortion is composed of higher harmonics (n ? 2) and looks like a density snake near the plasma edge. According to statistical analyses, ELM triggering by the EPdMs requires a finite level of waveform distortion and pedestal recovery. ELM pacing by the EPdMs occurs when the repetition frequency of the EPdMs is higher than the natural ELM frequency. EPs transported by EPdMs are thought to contribute to change the edge stability.

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

    SciTech Connect

    Kawakami, S.; Ohno, N.; Shibata, Y.; Isayama, A.; Kawano, Y.; Watanabe, K. Y.; National Institute for Fusion Science, Toki 509-5292 ; Takizuka, T.; Okamoto, M.

    2013-11-15

    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.

  8. Improvement of uniformity of the negative ion beams by tent-shaped magnetic field in the JT-60 negative ion source

    SciTech Connect

    Yoshida, Masafumi Hanada, Masaya; Kojima, Atsushi; Kashiwagi, Mieko; Akino, Noboru; Endo, Yasuei; Komata, Masao; Mogaki, Kazuhiko; Nemoto, Shuji; Ohzeki, Masahiro; Seki, Norikazu; Sasaki, Shunichi; Shimizu, Tatsuo; Terunuma, Yuto; Grisham, Larry R.

    2014-02-15

    Non-uniformity of the negative ion beams in the JT-60 negative ion source with the world-largest ion extraction area was improved by modifying the magnetic filter in the source from the plasma grid (PG) filter to a tent-shaped filter. The magnetic design via electron trajectory calculation showed that the tent-shaped filter was expected to suppress the localization of the primary electrons emitted from the filaments and created uniform plasma with positive ions and atoms of the parent particles for the negative ions. By modifying the magnetic filter to the tent-shaped filter, the uniformity defined as the deviation from the averaged beam intensity was reduced from 14% of the PG filter to ?10% without a reduction of the negative ion production.

  9. Achievement of 500 keV negative ion beam acceleration on JT-60U negative-ion-based neutral beam injector

    NASA Astrophysics Data System (ADS)

    Kojima, A.; Hanada, M.; Tanaka, Y.; Kawai, M.; Akino, N.; Kazawa, M.; Komata, M.; Mogaki, K.; Usui, K.; Sasaki, S.; Kikuchi, K.; Seki, N.; Nemoto, S.; Oshima, K.; Simizu, T.; Kubo, N.; Oasa, K.; Inoue, T.; Watanabe, K.; Taniguchi, M.; Kashiwagi, M.; Tobari, H.; Umeda, N.; Kobayashi, S.; Yamano, Y.; Grisham, L. R.

    2011-08-01

    Hydrogen negative ion beams of 507 keV, 1 A and 486 keV, 2.8 A have been successfully produced in the JT-60U negative ion source with a three-stage accelerator by overcoming a poor voltage holding of the accelerator with large-size grids of ~2 m2. This is the first result of H- beam acceleration up to 500 keV at a high current of over 1 A. In order to improve the voltage holding capability, the breakdown voltages of the large-size grids and small-size electrodes with uniform and locally strong electric fields were examined by changing the gap length. It was found that the voltage holding of the large-size grids was below half of that of the small-size electrodes with a uniform electric field which was used in the design of the accelerator. This degradation was found to be caused by the local electric field concentrations in addition to the size. Based on the results of the voltage holding tests and beam optics calculations, the gap lengths of the large-size grids were tuned to have a capability to sustain 600 kV. As a result, the gap tuning realized stable voltage holding during beam accelerations without significant degradations of the beam optics and stripping loss. These results indicated that stable 500 keV beam accelerations required for JT-60SA are feasible and this gap tuning is also applicable for the design of ITER accelerator.

  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. Flight effects on noise generated by the JT8D-17 engine in a quiet nacelle and a conventional nacelle as measured in the NASA-Ames 40- by 80-foot wind tunnel

    NASA Technical Reports Server (NTRS)

    Strout, F. G.

    1976-01-01

    A JT8D-17 turbofan engine was tested in the NASA-Ames 40- by 80-foot wind tunnel to determine flight effects on jet and fan noise. Baseline, quiet nacelle with 20-lobe ejector/suppressor, and internal mixer configurations were tested over a range of engine power settings and tunnel velocities. Flight effects derived from the 40- by 80-foot wind tunnel test are compared with 727/JT8D flight test data and with model data obtained in a smaller wind tunnel. Procedures are defined for measuring noise data in a wind tunnel relatively near the sources and analyzing the results to obtain far-field flight effects. Wind tunnel and 727 flight test noise results compare favorably for both the baseline and quiet nacelle configurations. Two reports are provided, including a comprehensive version with extensive test results and analysis and the subject summary version that emphasizes data analysis and program finding.

  12. 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.

  13. Phase 2 program on ground test of refanned JT8D turbofan engines and nacelles for the 727 airplane. Volume 4: Airplane evaluation and analysis

    NASA Technical Reports Server (NTRS)

    1975-01-01

    The retrofit of JT8D-109 (refan) engines are evaluated on a 727-200 airplane in terms of airworthiness, performance, and noise. Design of certifiable hardware, manufacture, and ground testing of the essential nacelle components is included along with analysis of the certifiable airplane design to ensure airworthiness compliance and to predict the in-flight performance and noise characteristics of the modified airplane. The analyses confirm that the 727 refan airplane is certifiable. The refan airplane range would be 15% less that of the baseline airplane and block fuel would be increased by 1.5% to 3%. However, with this particular 727-200 model, with a brake release gross weight of 172,500 lb (78,245 kg), it is possible to operate the airplane (with minor structural modifications) at higher gross weights and increase the range up to 15% over the 727-200 (baseline) airplane. The refan airplane FAR Part 36 noise levels would be 6 to 8 EPNdB (effective perceived noise in decibels) below the baseline. Noise footprint studies showed that approach noise contour areas are small compared to takeoff areas. The 727 refan realizes a 68% to 83% reduction in annoyance-weighted area when compared to the 727-200 over a range of gross weights and operational procedures.

  14. Analyses of erosion and re-deposition layers on graphite tiles used in the W-shaped divertor region of JT-60U

    NASA Astrophysics Data System (ADS)

    Gotoh, Y.; Yagyu, J.; Masaki, K.; Kizu, K.; Kaminaga, A.; Kodama, K.; Arai, T.; Tanabe, T.; Miya, N.

    2003-03-01

    Erosion and re-deposition profiles were studied on graphite tiles used in the W-shaped divertor of JT-60U in June 1997-October 1998 periods, operated with all-carbon walls with boronizations and inner-private flux pumping. Continuous re-deposition layers were found neither on the dome top nor on the outer wing, while re-deposition layers of around 20 ?m thickness were found on the inner wing, in the region close to the dome top. On the outer divertor target, erosion was found to be dominant: maximum erosion depth of around 20 ?m was measured, while on the inner target, re-deposition was dominant: columnar structure layers of maximum thickness at around 30 ?m on the inner zone while laminar/columnar-layered structures of maximum thickness around 60 ?m were found on the outer zone. Poloidal distributions of the erosion depth/re-deposition layer thickness were well correlated with the frequency histograms of strike point position, which were weighted with total power of neutral beam injection, on both the outer and inner targets. Through X-ray photoelectron spectroscopy, composition of the re-deposition layers at a mid zone on the inner target were 3-4 at.% B and <0.6 at.% O, Fe, Cr, and Ni with remaining C. Boron atoms are mostly bound to C atoms but some may precipitated as boron.

  15. Balance of the stored energies sustained by the internal and edge transport barriers and effects of ELMs and L-H transitions in JT-60U

    NASA Astrophysics Data System (ADS)

    Kamada, Y.; Yoshida, M.; Sakamoto, Y.; Koide, Y.; Oyama, N.; Urano, H.; Kamiya, K.; Suzuki, T.; Isayama, A.; JT-60 Team

    2009-09-01

    To understand key physics processes determining radial profiles of the kinetic plasma parameters in the advanced tokamak operation scenarios, correlations between the edge transport barrier (ETB) and the internal transport barrier (ITB) have been studied in the JT-60U tokamak device. It has been found that the edge pedestal poloidal beta, ?p-ped, increases almost linearly with the total poloidal beta, ?p-tot, over a wide range of the plasma current for type I ELMing H-mode plasmas, and this dependence becomes stronger with increasing triangularity. This dependence is not due to the profile stiffness, since the dependence is the same regardless of the existence of ITB. As the stored energy inside the ITB-foot radius (WITB) increases, the total thermal stored energy (Wth) increases and then the pedestal stored energy (Wped) increases. On the other hand, as Wped increases, the ELM penetration expands more inwards and finally reaches the ITB-foot radius. At this situation, the ITB-foot radius cannot move outwards because of the erosion by ELMs. Then the fractions of WITB/Wth and Wped/Wth become almost constant. It has also been found that the type I ELM expels/decreases the edge toroidal momentum larger than the edge ion thermal energy. The ELM penetration for the toroidal rotation tends to be deeper than that for the ion temperature and can exceed the ITB-foot radius. The ELM penetration is deeper for CO-rotating plasmas than CTR rotating plasmas. In both cases, the ELM penetration is deeper in the order of the toroidal rotation (Vt), the ion temperature (Ti) and then the electron temperature (Te). The L-H transition also changes the Vt profile more significantly than the Ti profile. At the L-H transition, the pedestal Vt shifts into the CTR-direction deeply and suddenly without a change in Ti, and then the pedestal Vt grows further together with a growth of the pedestal Ti in a slower timescale. Such changes in Vt by ELMs and L-H transitions may affect degradation/evolution of ITBs.

  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. Exhaust emissions characteristics and variability for Pratt and Whitney JT8D-7A gas turbine engines subjected to major overhaul and repair. Final report Nov 1978-Feb 1979

    SciTech Connect

    Becker, E.E.; Frings, G.; Cavage, W.C.

    1980-09-01

    Seven Pratt and Whitney Aircraft (PWA) JT8D-7A turbofan engines were tested at Kennedy International Airport, New York, to evaluate exhaust emissions characteristics and data variability after overhaul. The measured data show that the engines tested did not meet the Environmental Protection Agency (EPA) emission standards. A comparison of the measured data, obtained from the seven overhauled engines evaluated under this program, with new engine data obtained from PWA show that there is a great deal of similarity between the two sets of data. Differences shown in this report between new engine and overhauled engine data are due to the quantity of the engines sampled; the new engine data represent a larger sample size. Satisfactory data can be measured by using the test procedures, instrumentation, and equipment defined in this report.

  18. Doppler shifts in the KATRIN experiment

    E-print Network

    Heine, Matthew K

    2008-01-01

    In the past few decades, neutrinos, which are predicted to be massless particles by the Standard Model of Particle Physics, have been shown to have non-zero mass. The absolute scale of this neutrino mass has significant ...

  19. Seite 1 von 2 Katrin Bansemer

    E-print Network

    Heermann, Dieter W.

    R E S S E M I T T E I L U N G Probier's mal ... vegan! Vegan Taste Week in allen Mensen des Studierendenwerks Heidelberg Mit veganer Vielfalt punkten die Mensen des Studierendenwerks Heidelberg in der Vegan mit der Albert Schweitzer Stiftung für unsere Mitwelt und mit Unterstützung des Vegan-Kochs Björn

  20. Boundary condition for toroidal plasma flow imposed at the separatrix in high confinement JT-60U plasmas with edge localized modes and the physics process in pedestal structure formation

    SciTech Connect

    Kamiya, K.; Honda, M.; Urano, H.; Yoshida, M.; Kamada, Y.; Itoh, K.

    2014-12-15

    Modulation charge eXchange recombination spectroscopy measurements with high spatial and temporal resolution have made the evaluation of the toroidal plasma flow of fully stripped carbon impurity ions (V{sub ?}{sup C6+}) in the JT-60U tokamak peripheral region (including, in particular, the separatrix) possible with a better signal-to-noise ratio. By comparing co- and counter-neutral beam injection discharges experimentally, we have identified the boundary condition of V{sub ?}{sup C6+} and radial electric field shear (?E{sub r}) imposed at the separatrix in high confinement (H-mode) plasmas with edge localized modes (ELMs). The V{sub ?}{sup C6+} value at the separatrix is not fixed at zero but varies with the momentum input direction. On the other hand, the ?E{sub r} value is nearly zero (or very weakly positive) at the separatrix. Furthermore, the edge localized mode perturbation does not appear to affect both V{sub ?}{sup C6+} and ?E{sub r} values at the separatrix as strongly as that in the pedestal region. The above experimental findings based on the precise edge measurements have been used to validate a theoretical model and develop a new empirical model. A better understanding of the physical process in the edge transport barrier (ETB) formation due to the sheared E{sub r} formation is also discussed.

  1. Boundary condition for toroidal plasma flow imposed at the separatrix in high confinement JT-60U plasmas with edge localized modes and the physics process in pedestal structure formation

    NASA Astrophysics Data System (ADS)

    Kamiya, K.; Honda, M.; Urano, H.; Yoshida, M.; Kamada, Y.; Itoh, K.

    2014-12-01

    Modulation charge eXchange recombination spectroscopy measurements with high spatial and temporal resolution have made the evaluation of the toroidal plasma flow of fully stripped carbon impurity ions ( V?C6 + ) in the JT-60U tokamak peripheral region (including, in particular, the separatrix) possible with a better signal-to-noise ratio. By comparing co- and counter-neutral beam injection discharges experimentally, we have identified the boundary condition of V?C6 + and radial electric field shear ( ?Er ) imposed at the separatrix in high confinement (H-mode) plasmas with edge localized modes (ELMs). The V?C6 + value at the separatrix is not fixed at zero but varies with the momentum input direction. On the other hand, the ?Er value is nearly zero (or very weakly positive) at the separatrix. Furthermore, the edge localized mode perturbation does not appear to affect both V?C6 + and ?Er values at the separatrix as strongly as that in the pedestal region. The above experimental findings based on the precise edge measurements have been used to validate a theoretical model and develop a new empirical model. A better understanding of the physical process in the edge transport barrier (ETB) formation due to the sheared Er formation is also discussed.

  2. 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.

  3. 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.

  4. Menu Structuring for Mobile Devices Katrin Sauerwein1

    E-print Network

    @sfu.ca, alexander.de.luca@ifi.lmu.de Abstract: This project sets a discussion about possible improvements for mobile images. The Manhattan Lens Stairs approach is based on human spatial memory abilities. It uses the Manhattan Lens to differ between important and unimportant items. Finally the Dynamic Neighbors ap- proach

  5. Miniature J-T refrigators using adsorption compressors

    NASA Technical Reports Server (NTRS)

    Chan, C. K.; Tward, E.; Elleman, D. D.

    1982-01-01

    More sophisticated cooling systems for the employed detectors will be needed to satisfy the demand for higher resolution and sensitivity of various detectors used in space missions. The design of the cooling system must take into consideration the unique environment of space vehicles. It is pointed out that a deep space vehicle usually has an ample supply of waste heat from a radioisotope thermoelectric generator (RTG) and has a heat sink near zero Kelvin. Passive radiative coolers have been used for cooling temperatures above 90 K. Cooling below 90 K is currently handled by phase changes of solid or liquid cryogens or mechanical refrigeration. However, the weight of the cryogen may be a problem in a long duration space mission. Refrigerators of small cooling capacity are required in many spacecraft applications. For some future NASA missions, a multistage Joule-Thomson refrigerator using adsorption compressors appears particularly attractive. A study is discussed of four different refrigeration stages which use charcoal as the adsorbent. The adsorbed gases are nitrogen, helium, hydrogen, and neon.

  6. 1999 J.T. Raviz. All rights reserved. CHAPTER ONE

    E-print Network

    eighty feet deep. Every pebble was distinct, every speckled trout, every hand's-breadth of sand by indiscriminate tim- ber harvests more than a century ago and by fire suppression since then. Today's landscape

  7. J. theor. Biol. (1998) 194, 551559 Article No. jt980774

    E-print Network

    Shapiro, Bruce E.

    1998-01-01

    due to hysteresis. This hysteresis is caused by a cusp catastrophe in the space defined by probe-node bifurcation as the probe position is varied. Probe approach and withdrawal result in different post-bifurcation

  8. 1999 J.T. Raviz. All rights reserved. CHAPTER THREE

    E-print Network

    the Great Basin. These physical attributes define atmospheric processes in the Tahoe basin as much as define resides in a high elevation basin separated from the Sacramento Valley by the dominant Sierra Nevada hydrological processes. The presence of the cold lake at the bottom of the Tahoe basin determines

  9. Sorption J-T refrigeration utilizing manganese nitride chemisorption

    NASA Technical Reports Server (NTRS)

    Jones, Jack; Lund, Alan

    1990-01-01

    The equilibrium pressures and compositions have been measured for a system of finely powdered manganese nitride and nitrogen gas at 650, 700, 800, and 850 C for various nitrogen loadings. Pressures ranged from less than 0.02 MPa at 650 C to 6.38 MPa at 850 C. Analysis of the test results has shown that under certain conditions Mn(x)N(y) could potentially be used in a triple regenerative sorption compressor refrigeration system, but the potential power savings are small compared to the increased complexity and reliability problems associated with very high temperature (above 950 C) pressurized systems.

  10. 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.

  11. Investigation of plasma facing components in JT-60U operation

    NASA Astrophysics Data System (ADS)

    Masaki, K.; Ando, T.; Kodama, K.; Arai, T.; Neyatani, Y.; Yoshino, R.; Tsuji, S.; Yagyu, J.; Kaminaga, A.; Sasajima, T.; Ouchi, Y.; Koike, T.; Shimizu, M.

    1995-04-01

    The mechanical fracture of three carbon fiber composite (CFC) first wall tiles was observed. This damage was probably caused by the electromagnetic force due to halo current during disruption. The required current to break the CFC tile is estimated to be 25 kA. The broken tile was rotated poloidally around the plasma with a speed of about 10 m/s during the following discharge. A possible driving force of this rotation might be the electromagnetic force due to the scrape-off layer (SOL) current. The required current to rotate the piece of the broken tile is 1 kA. These results indicate that electromagnetic interaction between SOL plasma and the plasma facing component is important in the research on the plasma wall interactions in fusion devices.

  12. Development of a low noise 10K JT. Refrigeration system

    NASA Astrophysics Data System (ADS)

    1986-02-01

    This report summarizes the results of an engineering design program to develop a low noise, closed cycle, Joule-Thomson, microminiature refrigeration system for 10K operation. During this period the effort has been focused on the fabrication of the argon and hydrogen stages of the three stage cooler. A test facility was designed and built which allows one to mount each refrigerator on a separate removable base and to test each in turn. Key to the successful fabrication of the refrigerator is the determination of the proper firing profile for sealing the refrigerator components. Three batches of refrigerators have been built to date, and reasonable yields are now being obtained for the fabrication of these stages. The helium stage has been designed and laid out, and the photomasks prepared. Work has continued on the hydraulically actuated compressor.

  13. 1999 J.T. Raviz. All rights reserved. CHAPTER SIX

    E-print Network

    in the Carson City Rural Area, but is largely devoid of development and economic activity. One incorporated century the economy has been geared primarily toward recreation and tourism. During the period of rapid are to support tourism and recreation (see, for example, RRC 1989, EDS 1990; NLTRA 1995; RRC Associates and Vasey

  14. The SALSA Corpus: a German corpus resource for lexical semantics Aljoscha Burchardt, Katrin Erk, Anette Frank,

    E-print Network

    Padó, Sebastian

    all languages but English. The availability of tree- banks was the driving force behind the recent as a data source for semantics-based NLP applications and the ex- traction of data for a semantic lexicon

  15. Predicting Mothers' Reports of Children's Mental Health Three Years after Hurricane Katrin.

    PubMed

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

    2013-01-01

    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

  16. POS Tagging of Dialectal Arabic: A Minimally Supervised Approach Kevin Duh and Katrin Kirchhoff

    E-print Network

    Washington at Seattle, University of

    approach that only requires raw text data from sev- eral varieties of Arabic and a morpholog- ical analyzer of dialectal Arabic is difficult for the following reasons: · Resources such as lexicons, morphological an to the effect of dis- fluencies, incomplete sentences, varied word order, etc. · The rich morphology of Arabic

  17. Factored Language Models and Generalized Parallel Backoff Jeff A. Bilmes Katrin Kirchhoff

    E-print Network

    Noble, William Stafford

    as bundles of features (e.g., morphological classes, stems, data­driven clusters, etc.), and induces a prob. This paper provides initial perplexity results on both CallHome Arabic and on Penn Treebank Wall Street­ tors can be anything, including morphological classes, stems, roots, and other such features in highly

  18. Factored Language Models and Generalized Parallel Backoff Jeff A. Bilmes Katrin Kirchhoff

    E-print Network

    Washington at Seattle, University of

    as bundles of features (e.g., morphological classes, stems, data-driven clusters, etc.), and induces a prob. This paper provides initial perplexity results on both CallHome Arabic and on Penn Treebank Wall Street can be anything, including morphological classes, stems, roots, and other such features in highly in

  19. Automatic Learning of Language Model Structure Kevin Duh and Katrin Kirchhoff

    E-print Network

    Washington at Seattle, University of

    Statistical language modeling remains a challeng- ing task, in particular for morphologically rich lan- guages words, such as morphological or syntactic features. However, the number of possible choices for model knowledge-based and ran- dom selection procedures on two different language modeling tasks (Arabic

  20. The granulocyte nucleus and lamin B receptor: avoiding Katrin Hoffmann & Karl Sperling & Ada L. Olins &

    E-print Network

    Olins, Ada L.

    blood granulocyte, the neutro- phil, is an essential component of the innate immunity system, emigrating. In the eighteenth century, microscopists (Lieutaud, de Senac, Hewson) described white cells in pus and the lymphatic, ME 04011, USA e-mail: dolins@bowdoin.edu #12;system (Piller 2001). The introduction of tissue

  1. A review of "Donne's Augustine: Renaissance Cultures of Interpretation" by Katrin Ettenhuber 

    E-print Network

    Harris, Mitchell M.

    2012-01-01

    by ?????? ?. ??????, ????????? ?? ??? (????? ?? ?) In their monumental edition of John Donne?s sermons, George Potter and Evelyn Simpson came to some stunning realizations about Saint Augustine?s in?uence upon John Donne. Of the Church Fathers that Donne cited, Augustine eclipsed all others by a signi?cant margin... and two) is intent upon demonstrating ?the breadth and range of Donne?s Augustinian reading? (21). In chapter one, ?How Donne Read Augustine,? Ettenhuber returns to the seminal work of Potter and Simpson, pointing out how new research methods allow us...

  2. Rotation of Escherichia coli F1-ATPase Hiroyuki Noji,* Katrin Hasler, Wolfgang Junge, Kazuhiko Kinosita, Jr.,*,

    E-print Network

    Junge, Wolfgang

    Bacillus PS3 (Noji, H., Ya- suda, R., Yoshida, M., and Kinosita, K., Jr. (1997) Na- ture 386, 299­302), we observation in a single 3 3 subcomplex of F1-ATPase from thermophilic Bacillus PS3 (TF1) (9). Attachment

  3. SALTO A Versatile Multi-Level Annotation Tool Aljoscha Burchadt, Katrin Erk, Anette Frank

    E-print Network

    Padó, Sebastian

    as each tree can be anchored at some overt expression in the sentence. SALTO accepts input in TIGER XML (Mengel and Lez- ius, 2000) as well as its own output format, SALSA/TIGER XML (Erk and Pado, 2004). TIGER from many treebank formats to TIGER XML is available via TIGERRegistry, a component of TIGERSearch

  4. Ultrasensitive Chemical Analysis by Raman Spectroscopy Katrin Kneipp,* Harald Kneipp, Irving Itzkan, Ramachandra R. Dasari, and Michael S. Feld

    E-print Network

    Turro, Nicholas J.

    . Introduction 2957 2. Surface-Enhanced Raman Scattering (SERS) 2959 2.1. Brief Introduction to the SERS Effect 2959 2.2. SERS Enhancement Factors and Effective SERS Cross Sections 2961 3. Single-Molecule Raman Spectroscopy 2966 3.1. Application of SERS for Trace Analysis down to an Approximately 100 Molecule Detection

  5. 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.

  6. 76 FR 72130 - Airworthiness Directives; Pratt & Whitney JT9D Series Turbofan Engines

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-11-22

    .... Discussion On March 1, 2007, we issued AD 2007-05-17, Amendment 39-14978 (72 FR 10350, March 8, 2007), for... result in an uncontained engine failure and damage to the airplane. Actions Since Existing AD (72 FR... requirements of AD 2007- 05-17 (72 FR 10350, March 8, 2007). This proposed AD would supersede AD 2007-05-17...

  7. 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.

  8. 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.

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

    SciTech Connect

    Makowski, K. P.; Hayashil, B.; Larson, M. E.; Loc, A. S.; Zhang, B. X.; Leland, R. S.

    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.

  10. 67 FR 65495 - Airworthiness Directives; Pratt & Whitney JT8D-200 Series Turbofan Engines

    Federal Register 2010, 2011, 2012, 2013, 2014

    2002-10-25

    ...installation of stops on the fan exit guide vane case. This amendment is prompted...the fan duct case and the fan exit guide vane case separating due to a fan blade...the fan duct case and the fan exit guide vane case from separating due to...

  11. 67 FR 45680 - Airworthiness Directives; Pratt & Whitney JT8D-200 Series Turbofan Engines

    Federal Register 2010, 2011, 2012, 2013, 2014

    2002-07-10

    ...installation of stops on the fan exit guide vane case. This proposal is prompted...the fan duct case and the fan exit guide vane case separating due to a fan blade...the fan duct case and the fan exit guide vane case from separating due to...

  12. e Science Jervioe Feature Released u--on receisJt

    E-print Network

    season is now on i n Death Valley. Although t h i s California desert i s notorious the world over f o r: iiunch, neL- the eastern edge of t h e valley, where it i s L m t t Y certain the temperature does

  13. Short-term performance deterioration in JT9D-7A(SP) engine 695743

    NASA Technical Reports Server (NTRS)

    Bouchard, R. J.; Beyerly, W. R.; Sallee, G. P.

    1978-01-01

    The level of performance deterioration that occurred during early service was studied and also the contribution of each engine module to the overall level of engine performance deterioration. To assist in the distribution of the performance losses to the module level, testing with expanded experimental instrumentation was accomplished to permit direct measurement of module performance. An analytical teardown of the engine was accomplished to permit assignment of module performance losses to individual mechanical damage mechanisms including blade and seal wear, roughness, and thermal distortion of turbine parts. The results of the testing show that the engine deteriorated 1.5 percent in thrust specific fuel consumption from its performance when new. Initial testing, which included water washing, showed that 0.2 percent in performance deterioration was due to surface contamination (dirt) and 0.1 percent was due to drift of the engine vane control system, leaving 1.2 percent in basic TSFC deterioration. This 1.2 percent TSFC loss was distributed among the engine modules with 0.6 percent caused by clearance changes, 0.4 percent loss due to thermal distortion, and 0.2 percent loss due to increased roughness of the fan and low-pressure compressor airfoils.

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

    E-print Network

    Microseismic mapping of a Cotton Valley hydraulic fracture using decimated downhole arrays J three hydraulic fracture operations in the Cotton Valley gas field of East Texas. Two 48-level, 3 in the Cotton Valley gas field of East Texas (Walker, 1997). The Cotton Valley Project was an important test

  15. Development of a Low Heat Leak CFRP Stand for Miri Cooler jt Heat Exchanger Stage

    NASA Astrophysics Data System (ADS)

    Makowski, K. P.; Larson, M. E.; Loc, A. S.; Zhang, B. X.; Leland, R. S.; Hayashi1, B.

    2010-04-01

    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.

  16. Performance deterioration based on simulated aerodynamic loads test, JT9D jet engine diagnostics program

    NASA Technical Reports Server (NTRS)

    Stromberg, W. J.

    1981-01-01

    An engine was specially prepared with extensive instrumentation to monitor performance, case temperatures, and clearance changes. A special loading device was used to apply known loads on the engine by the use of cables placed around the flight inlet. These loads simulated the estimated aerodynamic pressure distributions that occur on the inlet in various segments of a typical airplane flight. Test results indicate that the engine lost 1.3 percent in take-off thrust specific fuel consumption (TSFC) during the course of the test effort. Permanent clearance changes due to the loads accounted for 1.1 percent; increase in low pressure compressor airfoil roughness and thermal distortion in the high pressure turbine accounted for 0.2 percent. Pretest predicted performance loss due to clearance changes was 0.9 percent in TSFC. Therefore, the agreement between measurement and prediction is considered to be excellent.

  17. Effect of steady flight loads on JT9D-7 performance deterioration

    NASA Technical Reports Server (NTRS)

    Jay, A.; Todd, E. S.

    1978-01-01

    Short term engine deterioration occurs in less than 250 flights on a new engine and in the first flights following engine repair; while long term deterioration involves primarily hot section distress and compression system losses which occur at a somewhat slower rate. The causes for short-term deterioration are associated with clearance changes which occur in the flight environment. Analytical techniques utilized to examine the effects of flight loads and engine operating conditions on performance deterioration are presented. The role of gyroscopic, gravitational, and aerodynamic loads are discussed along with the effect of variations in engine build clearances. These analytical results are compared to engine test data along with the correlation between analytically predicted and measured clearances and rub patterns. Conclusions are drawn and important issues are discussed.

  18. Stability of the Toroidicityinduced Alfv'en Eigenmode in JT60U ICRF Experiments

    E-print Network

    )(1 \\Gamma 0:88\\Psi) 0:5 ; (1) P = P (0)(1 \\Gamma \\Psi) 2 ; (2) and q = q 0 + \\Psi '' q 1 \\Gamma q 0 + (q 0 1 \\Gamma q 1 + q 0 ) (1 \\Gamma \\Psi s )(\\Psi \\Gamma 1) \\Psi \\Gamma \\Psi s # (3) where \\Psi s = (q 0 1 \\Gamma q 1 + q 0 )=(q 0 0 + q 0 1 \\Gamma 2q 1 + 2q 0 ), \\Psi is the poloidal flux normalized to unity

  19. Name: Mai Magdy Soliman E-Mail: mai.jt4@gmail.com

    E-print Network

    Stroetmann, Karl

    and Engineering Degree intended: Bachelor Thesis Number of semester: one semester. Period of time: six months #12 because I have never tried to talk or communicate using it. Also the last course I have studied was two downloaded applications for learning German language on my mobile and started to refresh my memory. The main

  20. Development of a hermetically sealed brushless DC motor for a J-T cryocooler

    NASA Technical Reports Server (NTRS)

    Joscelyn, Edwin; Hochler, Irwin; Ferri, Andrew; Rott, Heinz; Soukaris, Ted

    1996-01-01

    This development was sponsored by Ball Aerospace for the Cryogenic On-Orbit LongLife Active Refrigerator (COOLLAR) program. The cryocooler is designed to cool objects to 65 K and operate in space for at least 7 years. The system also imports minimal impact to the spacecraft in terms of vibration and heat. The basic Joule-Thompson cycle involves compressing a working fluid, nitrogen in this case, at near-constant temperature from 17.2 KPa to 6.89 MPa. The nitrogen is then expanded through a Joule-Thompson valve. The pure nitrogen gas must be kept clean; therefore, any contamination from motor organic materials must be eliminated. This requirement drove the design towards sealing of the motor within a titanium housing without sacrificing motor performance. It is estimated that an unsealed motor would have contributed 1.65 g of contaminants, due to the organic insulation and potting materials, over the 7-year life. This paper describes the motor electrical and mechanical design, as well as the sealing difficulties encountered, along with their solutions.

  1. Update Your Personal Information in the ADP Portal EMP-CS-2000JT

    E-print Network

    Frantz, Kyle J.

    Pkwy, Sandersville, Georgia 31082 Toll Free (855) 214-2644 Phone (478) 240-6500 Fax (478) 240-6414 E-mail, Georgia 31082 Toll Free (855) 214-2644 Phone (478) 240-6500 Fax (478) 240-6414 E-mail helpdesk need to update your personal information (mailing address, e-mail address, phone number, emergency

  2. tlf~H.al.f;\\l, 'Jt~:;~j' Seere~ ,~,Direetor

    E-print Network

    ., occurring in greatest numbersI h~", 1ft .\\' the 100ler part of Puget Sound in the Stateo.! Washington Japan, and grown in Puge,t Sound, Wlllape. Bay, and Gray's Harbor, Yiashington. Planted for the first of dams which intercept the access of fresh water, harbor improvements and espec:ially pollution

  3. Brady, J.B., Kovaric, D.N., Cheney, J.T., Jacob, L.J., and King, J.T., 2004, 40 Ar ages of metamorphic rocks from the Tobacco Root Mountains region, Montana,

    E-print Network

    Brady, John B.

    of metamorphic rocks from the Tobacco Root Mountains region, Montana, in Brady, J.B., Burger, H.R., Cheney, J ages of metamorphic rocks from the Tobacco Root Mountains region, Montana John B. Brady Dana N. Kovaric Ar total gas ages for hornblende from metamorphic rocks of the Tobacco Root Mountains in southwest

  4. Program on ground test of modified quiet, clean, JT3D and JT8D turbofan engines in their respective nacelles. [modification of Boeing 707, 727, and 737 aircraft for aircraft noise reduction

    NASA Technical Reports Server (NTRS)

    1973-01-01

    A program to reduce the community noise levels of commercial jet aircraft is summarized. The program objective is the development of three acoustically treated nacelle configurations for the 707, 727, and 737 series aircraft to provide maximum noise reduction with minimum performance loss, modification requirements, and economic impact. The preliminary design, model testing, data analyses, and economic studies of proposed nacelle configurations are discussed.

  5. 76 FR 41144 - Airworthiness Directives; Pratt & Whitney Corp. (PW) JT9D-7R4H1 Turbofan Engines

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-07-13

    ... ``significant rule'' under the DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979), (3) Will... life limits, and establishes a new, lower life-limit for these parts. This proposed AD was prompted by... operating metal ] temperatures impose a greater low-cycle fatigue life debit for each operating...

  6. 75 FR 38052 - Airworthiness Directives; Pratt & Whitney JT8D-209, -217, -217A, -217C, and -219 Series Turbofan...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-07-01

    ... April 11, 2000 (65 FR 19477-78). Examining the AD Docket You may examine the AD docket on the Internet... 39 by superseding AD 2005-02- 03, Amendment 39-13948 (70 FR 3867, January 27, 2005). That AD requires... Regulatory Policies and Procedures (44 FR 11034, February 26, 1979); and 3. Would not have a...

  7. 76 FR 16526 - Airworthiness Directives; Pratt & Whitney JT8D-209, -217, -217A, -217C, and -219 Series Turbofan...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-03-24

    ...-13948 (70 FR 3867, January 27, 2005). That AD applies to the specified products. The NPRM published in the Federal Register on July 1, 2010 (75 FR 38052). That NPRM proposed the same torque inspection... 12866; (2) Is not a ``significant rule'' under DOT Regulatory Policies and Procedures (44 FR...

  8. 76 FR 77107 - Airworthiness Directives; Pratt & Whitney Corp. (PW) JT9D-7R4H1 Turbofan Engines

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-12-12

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

  9. TSC Modelling of Current Ramp Scenarios with ITB-Generated Bootstrap Currents in JT-60U Reversed Shear Discharges

    E-print Network

    -machi, Naka, Ibaraki, 311-0193, Japan 2) Research Laboratory for Nuclear Reactors, Tokyo Institute an over-drive bootstrap current which accompanies a negative electric field just inside of the ITB region is a free boundary, axisymmetric, single fluid, time-evolution code with PF coil power supplies, realistic

  10. Evaluation of two inflow control devices for flight simulation of fan noise using a JT15D engine

    NASA Technical Reports Server (NTRS)

    Jones, W. L.; Mcardle, J. G.; Homyak, L.

    1979-01-01

    The program was developed to accurately simulate flight fan noise on ground static test stands. The results generally indicated that both the induct and external ICD's were effective in reducing the inflow turbulence and the fan blade passing frequency tone generated by the turbulence. The external ICD was essentially transparent to the propagating fan tone but the induct ICD caused attenuation under most conditions.

  11. Ridge Curves and Shape Analysis J.T. Kent, K.V. Mardia and J.M. West

    E-print Network

    Kent, John T.

    (1994) to the problem of nding ridge curves in machine vision. This work provides a simpler approach and related kriging predictors. #12;British Machine Vision Conference Koenderink (1990, p.290), points out- face with the plane spanned by the normal (given by u v) to the #12;British Machine Vision Conference

  12. Rough Approximations under Level Fuzzy Sets W.-N. Liu J.T. Yao Y.Y.Yao

    E-print Network

    Yao, JingTao

    of fuzzy sets in crisp approximation spaces, approximation of crisp sets in fuzzy approximation spaces by a family of crisp subsets (-level sets), these -level sets can be approximated by equivalence relations or -cut of A is a crisp subset of U defined by A(x) = 1 if A(x) 0 otherwise ; the -level fuzzy set

  13. 75 FR 12968 - Airworthiness Directives; Pratt & Whitney JT8D-209, -217, -217C, and -219 Turbofan Engines

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-03-18

    ...installed. That AD currently requires cleaning the front compressor front hubs (fan...holes for cracks, removal of bushings, cleaning and ECI and FPI of bushed holes for cracks...67831). That action proposed to require cleaning the front compressor front hubs...

  14. 75 FR 12968 - Airworthiness Directives; Pratt & Whitney JT8D-209, -217, -217C, and -219 Turbofan Engines

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-03-18

    ... (62 FR 4902). ADDRESSES: You can get the service information identified in this AD from Pratt... proposed AD in the Federal Register on December 21, 2009 (74 FR 67831). That action proposed to require...'' under DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979); and (3) Will not have...

  15. 76 FR 16526 - Airworthiness Directives; Pratt & Whitney JT8D-209, -217, -217A, -217C, and -219 Series Turbofan...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-03-24

    ...3rd stage and 4th stage low- pressure turbine (LPT) blades for shroud notch wear and...effective. We are issuing this AD to prevent turbine blade failures that could result in uncontained...which they state is stage 3/stage 4 LPT turbine blades shroud wear and subsequent...

  16. 75 FR 38052 - Airworthiness Directives; Pratt & Whitney JT8D-209, -217, -217A, -217C, and -219 Series Turbofan...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-07-01

    ...3rd stage and 4th stage low- pressure turbine (LPT) blades for shroud notch wear and...We are proposing this AD to prevent turbine blade failures that could result in uncontained...condition, if not corrected, could result in turbine blade failures that could result in...

  17. Ergebnisprotokoll der Nachlese Schlerinnentag Natur Wissenschaft Technik am 24.11.2014, 11.00 Uhr bis 12.30 Uhr, Senatssaal Geb. 47

    E-print Network

    Berns, Karsten

    Informationstechnik) Katrin Kuhnert (Studierenden Service Center) Dipl. Ing. (FH) Doris Geib (Fachbereich Maschinenbau/Verfahrenstechnik Ripp (Fachbereich Maschinenbau/Verfahrenstechnik) Dr. Jürgen E. Blank (Fachbereich

  18. 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.

  19. 75 FR 62319 - Airworthiness Directives; Pratt & Whitney JT8D-9, -9A, -11, -15, -17, and -17R Turbofan Engines

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-10-08

    ...time to determine the root cause of a fan blade...rulemaking process. The root cause investigation can...clarification of the shop visit definition in paragraph (i) of...cracking at the blade root, which could result...72-33-21, Inspection 00. Definitions (i) For the...

  20. 75 FR 27972 - Airworthiness Directives; Pratt & Whitney JT8D-9, -9A, -11, -15, -17, and -17R Turbofan Engines

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-05-19

    ...increased vibratory stress in the root and airfoil from eroded and...vibratory stress in the airfoil and root is increased. This condition...fatigue cracking at the blade root, which could result in uncontained...72-33-21, Inspection 00. Definitions (i) For the purpose of...

  1. 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.

    and load data, estimates weather-normalized electric loads, computes design- day parameters, computes weather normalized factors, estimates trends, and calculates the probability distribution of the peak load by electric utilities to estimate and forecast the load growth in different service areas. The software builds

  2. IN VITRO STUDY OF THE AIRFLOW IN ORAL CAVITY DURING SPEECH PACS : 43.70.-h, 43.70.Aj, 43.70.Bk, 43.70.Jt

    E-print Network

    Payan, Yohan

    production. All these results incitate us to exploit further on our experimental setup. INTRODUCTION of an airflow interaction. Sleeping apnea or snoring is another spectacular example of such an interaction a quasy-steady assumption can be made which greatly simplifies the problem. Further, when snoring

  3. Wind tunnel test of model target thrust reversers for the Pratt and Whitney aircraft JT8D-100 series engines installed on a 727-200 airplane

    NASA Technical Reports Server (NTRS)

    Hambly, D.

    1974-01-01

    The results of a low speed wind tunnel test of 0.046 scale model target thrust reversers installed on a 727-200 model airplane are presented. The full airplane model was mounted on a force balance, except for the nacelles and thrust reversers, which were independently mounted and isolated from it. The installation had the capability of simulating the inlet airflows and of supplying the correct proportions of primary and secondary air to the nozzles. The objectives of the test were to assess the compatibility of the thrust reversers target door design with the engine and airplane. The following measurements were made: hot gas ingestion at the nacelle inlets; model lift, drag, and pitching moment; hot gas impingement on the airplane structure; and qualitative assessment of the rudder effectiveness. The major parameters controlling hot gas ingestion were found to be thrust reverser orientation, engine power setting, and the lip height of the bottom thrust reverser doors on the side nacelles. The thrust reversers tended to increase the model lift, decrease the drag, and decrease the pitching moment.

  4. Updated on Dec 2011 1. Chen Wei, Chen ZY, Wee ATS, Xie LF, Wang X, Sun JT, Ariando "Hole Doping of

    E-print Network

    Yao, Shao Q

    via H2Plasma Treatment for Enhanced Visible Light Organic Waste Decontamination in Water" US, 61/568,246 Dec 2011 Publications on peerreviewed journals (* for corresponding authors) Total citations Organic Molecules" (invited review article) Huang H*, Wong SL, Chen Wei, and Wee ATS*, J. Phys: D. Appl

  5. Williams, A., Portelius, E., Kheterpal, I., Guo, J.T., Cook, K., Xu, Y., and Wetzel, R. (2004). Mapping Abeta amyloid fibril secondary structure using scanning proline mutagenesis.

    E-print Network

    Stanley, H. Eugene

    2004-01-01

    's, Parkinson's, CreutzfeldtJakob, motor neuron diseases, and polyglutamine disorders, are known 40, 343­354. Yankner, B. A. (1996). Mechanism of neuronal degeneration in Alzheimer`s disease. Neuron with Alzheimer's disease (AD). Despite the simplifications introduced in the DMD approach, the predicted A#12

  6. J. theor. Biol. (1998) 190, 201214 00225193/98/030201 + 14 $25.00/0/jt970548 7 1998 Academic Press Limited

    E-print Network

    de Boer, Rob J.

    1998-01-01

    -transcriptase (RT) (Wei et al., 1995; Perelson et al., 1997). Following such a therapeutic perturbation of the quasi control process is the anti-viral immune response. HIV-1 infection elicits both humoral and cellular

  7. 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

    ...transferor and transferee: Mark K. Seifert, 107 Saint Brides Court, Cary, NC 27518, (919) 362-4452. FERC Contact...under the ``e-Filing'' link. If unable to be filed electronically, documents may be paper-filed. To paper-file, an original...

  8. J. theor. Biol. (1998) 192, 155166 00225193/98/100155 + 12 $25.00/0/jt970590 7 1998 Academic Press Limited

    E-print Network

    Hauert, Christoph

    1998-01-01

    , 1977; Trivers, 1971) and vampire bats (Wilkinson, 1984). In the former case two young male baboons of mounting an oestrous female. In the latter situation well fed vampire bats regurgitate some blood to feed their hungry fellow bats. Other examples from biology include predator inspection, alarm calls, grooming, etc

  9. Nanofilm Allotrope and Phase Transformation of Ultrathin Bi Film on Si111-7 7 T. Nagao,1,2,* J.T. Sadowski,1

    E-print Network

    Hasegawa, Shuji

    initio calculations, we propose that the new allotrope consists of black phosphorus-like puckered layers-layer structure was never observed before ex- cept for the case of black phosphorus, which is a famous teratoid

  10. 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

  11. 75 FR 62319 - Airworthiness Directives; Pratt & Whitney JT8D-9, -9A, -11, -15, -17, and -17R Turbofan Engines

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-10-08

    ... Federal Register on May 19, 2010 (75 FR 27972). That action proposed to require overhauling fan blade... ``significant rule'' under DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979); and (3) Will..., Massachusetts, on October 1, 2010. Peter A. White, Assistant Manager, Engine and Propeller Directorate,...

  12. Govindjee, University of Illinois, Urbana, USA; J.T. Beatty, University of British Columbia, Vancouver, Canada; H. Gest, Indiana University, Bloomington, USA; J.F.

    E-print Network

    Govindjee "Gov"

    Biology, Microbiology, Cell Biology, Biochemistry, Biophysics and History of Science. From the reviews. Thomas Beatty, Howard Gest and John F. Allen, is a remarkable Encyclopedia of Research in Photosynthesis libraries around the World." (Giorgio Forti, Professor of Biology, University of Milano, Italy) "A wonderful

  13. J. theor. Biol. (1997) 189, 6380 00225193/97/000000 + 18 $25.00/0/jt970494 7 1997 Academic Press Limited

    E-print Network

    Sherratt, Jonathan A.

    1997-01-01

    MARKUS R. OWEN* AND JONATHAN A. SHERRATT Nonlinear Systems Laboratory, Mathematics Institute, University with normal tissue cells initially present, and may also recruit other cell types including lymphatic which can have a variety of effects upon the tumour, leading to a delicate balance between growth

  14. J. theor. Biol. (1997) 186, 117129 00225193/97/090117 + 13 $25.00/0/jt960319 7 1997 Academic Press Limited

    E-print Network

    Pilyugin, Sergei S.

    1997-01-01

    , and was subsequently shown to have signs of karyotypic abnormality. Their results demonstrated a Hayflick limit in all varies widely for cells obtained from different species. In the case of fibroblasts and other somatic

  15. 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

  16. 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, LANL Salman Habib, ANL Jim Ahrens, LANL LA-UR-14-21116 #12;Outline Background: SDAV, PISTON, VTK

  17. Sensitivity of neutrino mass experiments to the cosmic neutrino background

    E-print Network

    Formaggio, Joseph A.

    The KATRIN neutrino experiment is a next-generation tritium beta decay experiment aimed at measuring the mass of the electron neutrino to better than 200 meV at 90% C.L. Because of its intense tritium source, KATRIN can ...

  18. 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

    : Environmental Improvement and Restoration Fund; Coastal Impact Assistance Fund; Coastal Zone Management Fund areas, makes the task of managing coastal resources increasingly difficult, especially with the Nation revenues. However, it also burdens local environments, threatening the very resources that draw people

  19. Fluid Queue Models of Renewable Energy Storage Gareth L. Jones and Peter G. Harrison

    E-print Network

    Imperial College, London

    well, and note a modification to the model which would result in a poorer result. Jt off on = 15 µ and a buffer with a fixed service rate. The state of the CTMC Jt (describing the weather, say) determines

  20. SCHOOL OF MATHEMATICS AND STATISTICS Spring Semester Time Series 2 hours

    E-print Network

    bird of the plover family) is based on the evolution over years t of the number At of adult female birds and the number Jt of juvenile female birds. It is supposed that At = (At-1 + Jt-1) + t, where is a constant representing the year-to-year survival rate of birds and Jt = At-1 + t, where is a fertility rate

  1. 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.

  2. A solution to the dynamical inverse problem of EEG generation using spatiotemporal Kalman filtering

    E-print Network

    Galka, Andreas

    spatiotemporal Kalman filtering Andreas Galka1,3, , Okito Yamashita2 , Tohru Ozaki3 , Rolando Biscay4 and Pedro filtering problem. It can be approached by a new variant of Kalman filtering which allows to decompose of the Kalman filter. BUT: The function F J(t - 1), J(t - 2), . . . , J(t - p) is unknown. Assumptions: · F

  3. Validation of a model for Radon-induced background processes in electrostatic spectrometers

    E-print Network

    Wandkowsky, N; Fränkle, F M; Glück, F; Groh, S; Mertens, S

    2013-01-01

    The Karlsruhe Tritium Neutrino (KATRIN) experiment investigating tritium beta-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 alpha-decay of Rn-219 and Rn-220 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.

  4. Proceedings of the 47th Annual Meeting of the ACL and the 4th IJCNLP of the AFNLP, pages 10391047, Suntec, Singapore, 2-7 August 2009. c 2009 ACL and AFNLP

    E-print Network

    Friedrich-Schiller-Universit¨at Jena, Germany {katrin.tomanek|udo.hahn}@uni-jena.de Abstract While Active- ferent approaches to AL have been successfully applied to a wide range of NLP tasks (Engel- son and Dagan

  5. Techniques for direct neutrino mass measurement utilizing tritium [beta]-decay

    E-print Network

    Furse, Daniel Lawrence

    2015-01-01

    This thesis documents efforts performed in the service to two direct neutrino mass experiments, namely KATRIN at the Karlsruhe Institute of Technology in Karlsruhe, Germany and Project8 at the University of Washington in ...

  6. Nonequilibrium and nonlinear dynamics in Berea and Fontainebleau sandstones: Low-strain regime

    E-print Network

    Donatella Pasqualini,1 Katrin Heitmann,2 James A. TenCate,3 Salman Habib,4 David Higdon,5 and Paul A. Citation: Pasqualini, D., K. Heitmann, J. A. TenCate, S. Habib, D. Higdon, and P. A. Johnson (2007

  7. TextInfer 2011 Workshop on Textual Entailment Proceedings of the Workshop

    E-print Network

    organizers, Peter Clark, Vulcan Inc. Ido Dagan, Bar-Ilan University Katrin Erk, University of Texas at Austin-chair) Fabio Massimo Zanzotto, University of Rome "Tor Vergata" iii #12;#12;Organizers: Peter Clark, Vulcan Inc

  8. CONGRATULATIONS TO CTHB/TPCP STUDENTS AND STAFF IN 2012 AND EARLY 2013

    E-print Network

    laude) and Angelica Marsberg at FABI who graduated in 2012 and Gugu Khubeka, Valery Molota, Godfrey-Anne Pillay. D. Katrin Fitza. E. Melissa Simpson. F. Angelica Marsberg. G. Barrie Christie H. Johan van der

  9. Probing the absolute mass scale of neutrinos

    E-print Network

    Formaggio, Joseph A.

    The Karlsruhe Tritium Neutrino (KATRIN) experiment is the next generation tritium beta decay experiment with sub-eV sensitivity to make a direct, model independent measurement of the neutrino mass. The principle of the ...

  10. Characterization of multielectron dynamics in molecules: A multiconfiguration time-dependent Hartree-Fock picture

    SciTech Connect

    Ohmura, Shu; Kono, Hirohiko; Oyamada, Takayuki; Kato, Tsuyoshi; Nakai, Katsunori; Koseki, Shiro

    2014-09-21

    Using the framework of multiconfiguration theory, where the wavefunction ?(t) of a many-electron system at time t is expanded as ?(t)=?{sub I}C{sub I}(t)?{sub I}(t) in terms of electron configurations (?{sub I}(t)), we divided the total electronic energy E(t) as E(t)=?{sub I}|C{sub I}(t)|{sup 2}E{sub I}(t) . Here E{sub I}(t) is the instantaneous phase changes of C{sub I}(t) regarded as a configurational energy associated with ?{sub I}(t). We then newly defined two types of time-dependent states: (i) a state at which the rates of population transfer among configurations are all zero; (ii) a state at which (E{sub I}(t)) associated with the quantum phases of C{sub I}(t) are all the same. We call the former time-dependent state a classical stationary state by analogy with the stationary (steady) states of classical reaction rate equations and the latter one a quantum stationary state. The conditions (i) and (ii) are satisfied simultaneously for the conventional stationary state in quantum mechanics. We numerically found for a LiH molecule interacting with a near-infrared (IR) field ?(t) that the condition (i) is satisfied whenever the average velocity of electrons is zero and the condition (ii) is satisfied whenever the average acceleration is zero. We also derived the chemical potentials ?{sub j}(t) for time-dependent natural orbitals ?{sub j}(t) of a many-electron system. The analysis of the electron dynamics of LiH indicated that the temporal change in ??{sub j}(t) ? ?{sub j}(t) + ?(t) · d{sub j}(t) ? ?{sub j}(0) correlates with the motion of the dipole moment of ?{sub j}(t), d{sub j}(t). The values ??{sub j}(t) are much larger than the energy ?{sub j}(t) directly supplied to ?{sub j}(t) by the field, suggesting that valence electrons exchange energy with inner shell electrons. For H{sub 2} in an intense near-IR field, the ionization efficiency of ?{sub j}(t) is correlated with ??{sub j}(t). Comparing ??{sub j}(t) to ?{sub j}(t), we found that energy accepting orbitals of ??{sub j}(t) > ?{sub j}(t) indicate high ionization efficiency. The difference between ??{sub j}(t) and ?{sub j}(t) is significantly affected by electron-electron interactions in real time.

  11. ]f'ACll)[~ ]([ OQ) THW.E'f 56 FOR1El' & ]FtAN~JT:E JE1UPJEJFUMJE1, 1[ '~/JrA: 11 Jl Q)~I

    E-print Network

    to measure the moisture of cereal grains, cotton bales, and soil. Probably the first applica- tion readings on green annual range plots, by dry weights of plots, and regression line. Figure 2.--Range during the s urnme r of 1963 on a green annual grass range and a drying perennial range. It performed

  12. 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

    of planning becomes the goal rather than completion of tasks. Like goal setting (see the Goal Setting tipsheet. 3. As in goal setting, by writing down what has to be done, you are making a firm commitment to get manager means that you can complete more tasks and be more successful in what you do. Setting priorities

  13. Dale Meade Some promised international collaboration info

    E-print Network

    in Garching. With wife and two small children (both put into German schools). I brought American hardware to first data, upon arrival in Japan. http://wsx.lanl.gov/scifi.htm http://www-jt60.naka.jaea.go.jp/english/html/exp_rep/remoted.html http://www-jt60.naka.jaea.go.jp/english/html/exp_rep/rep38.html http://www-jt60.naka.jaea.go.jp/english

  14. Analysis of a tobacco vector and its actions in china: the activities of japan tobacco

    PubMed Central

    2010-01-01

    Japan Tobacco (JT) is the third largest tobacco company in the world, and China, the world's largest tobacco consumer, is one of the most important targets for JT. To provide information for tobacco control, we reviewed and analyzed JT and its tactics and strategies in the Chinese market mainly by systematic examination of documents which are made available in the University of California, San Francisco Legacy Tobacco Documents Library. As a result, JT has had a special interest to expand sales of its cigarettes in the Chinese market. PMID:20979655

  15. GenePool Information Sheet #4 v2 The Gene Pool (The University of Edinburgh Sequencing Facility)

    E-print Network

    Facility) Ashworth Laboratories, King's Buildings, Edinburgh, Scotland EH9 3JT, UK phone 0131 6513633: · Transcriptome sequencing · Genome sequencing de novo (including large-insert clone sequencing) · Genome

  16. Theoretical analysis of Ei ? e? <--> Ej ? e? vibronic Jahn-Teller spectra

    NASA Astrophysics Data System (ADS)

    Perets, Eli; Scharf, Benjamin E.

    1991-05-01

    The theoretical investigation of optical vibronic Jahn-Teller spectra of Ei ? e? ? Ej ? e? electronic transitions reveals intriguing features. Notably, perpendicular and also parallel cold allowed intensity may develop along the pertinent Jahn-Teller (J-T) progressions: 0(± {1}/{2}) ? v(? {1}/{2}, ± {3}/{2}) , and 0(± {1}/{2}) ? v(± {1}/{2}) , respectively, exhibiting quite different, unique intensity patterns. Contributions of intensities from both polarizations result in interesting J-T superposition intensity patterns. Spectra will not change on simultaneously reversing the direction of J-T distortion (displacement) in both electronic states involved in the transition. Remarkably this behavior still holds for perpendicular intensity on reversing the direction of J-T distortion in one of the electronic states only. Quite surprisingly, parallel intensity patterns will be affected drastically upon such reversal, thus enabling one to determine whether a change in the direction of J-T distortion takes place upon electronic transition. For no change in J-T distortion upon electronic transition the J-T vibronic structure of perpendicular cold allowed intensity may be well developed, whereas that of parallel cold allowed intensity degenerates into the vibrationless transition, thus disclosing no evidence for the occurrence of J-T activity. A mere reversal of J-T distortion during the radiative process may lead to a well developed J-T progression carrying parallel cold allowed intensity. The cold allowed perpendicular vibronic structure associated with each of the two relevant J-T progressions may simultaneously develop two great maxima with a pronounced depression between them exhibiting complete intensity cancellation which may grow into a wide "spectroscopic desert". This dramatic phenomenon may give the impression of the occurrence of two completely separate electronic transitions in the spectrum.

  17. Percolation features of cooperative Jahn-Teller systems: Ising EFT framework

    NASA Astrophysics Data System (ADS)

    Moujaes, Elie A.; Abou Ghantous, Michel

    2014-08-01

    Elastic exchange between two nearest Jahn-Teller (JT) centers in two or three dimensional dense crystals, can give an ordered macroscopic distortion known as cooperative JT effect (CJTE). A very diluted JT crystal does not show this effect. In the dynamic JT effect (DJTE), tunneling between different equivalent distorted wells has a pronounced influence on the CJTE. We investigate this phenomenon using a progressive increase in the concentration of these centers in the JT crystals, based on a bond percolation vector spin analogy technique within the framework of effective field theory (EFT). Mean field theory (MFT) was extensively used in previous studies of CJTE; however it neither includes correlation between JT centers in the lattice due to the complexity of the distortion field in the crystal nor the effect of tunneling between wells. We resort to an alternative procedure, by describing a JT center as a pseudo-spin vector , induced to represent the degenerate JT-distorted states, where two nearest JT centers interact via an elastic exchange described by an Ising type spin interaction. The DJTE is considered to be similar to an elastic transverse field term in the Hamiltonian portraying the effect of tunneling between equivalent wells in the adiabatic potential energy surface (APES). We will be particularly discussing S = 1, S = 3/2 and S = 5/2 spin cases, where 2 S + 1 wells in the APES are present and what JT systems they actually represent, with a percolative mechanism applied to the interactions between different JT centers. The different lattices are distinguished by their coordination numbers. Strong tunneling effects can suppress the CJTE and lead to a new state of criticality. Generalizations to higher spin systems will be obtained using a scaling technique. For the relevant distortions, we determine single site correlations, the macroscopic average distortion describing a structural phase transition and the elastic isothermal susceptibility as a function of temperature. The critical bond percolation threshold and the critical tunneling parameter are also obtained.

  18. Team Name Coach/Teacher School Name Amity Annihilators Deborah Day Amity Regional H.S.

    E-print Network

    Devoret, Michel H.

    . Koosa Holy Cross H.S. Exchange Smarticles Phil Stewart Hopkins School Feynman Falcons J.T. Schemm Joel Barlow H.S. Other Feynman Falcons J.T. Schemm Joel Barlow H.S. Conserved Jeffrey Roberts Plainvilles H.S. EM Falcon Peng Tian PRISMS Induction Wes DeSantis Ridgefield

  19. Construction of new cloning, lacZ reporter and scarless-markerless suicide vectors for genetic studies in Aggregatibacter actinomycetemcomitans

    PubMed Central

    Juárez-Rodríguez, María Dolores; Torres-Escobar, Ascención; Demuth, Donald R.

    2013-01-01

    To elucidate the putative function of a gene, effective tools are required for genetic characterization that facilitate its inactivation, deletion or modification on the bacterial chromosome. In the present study, the nucleotide sequence of the Escherichia coli/Aggregatibacter actinomycetemcomitans shuttle vector pYGK was determined, allowing us to redesign and construct a new shuttle cloning vector, pJT4, and promoterless lacZ transcriptional/translational fusion plasmids, pJT3 and pJT5. Plasmids pJT4 and pJT5 contain the origin of replication necessary to maintain shuttle vector replication. In addition, a new suicide vector, pJT1, was constructed for the generation of scarless and markerless deletion mutations of genes in the oral pathogen A. actinomycetemcomitans. Plasmid pJT1 is a pUC-based suicide vector that is counter-selectable for sucrose sensitivity. This vector does not leave antibiotic markers or scars on the chromosome after gene deletion and thus provides the option to combine several mutations in the same genetic background. The effectiveness of pJT1 was demonstrated by the construction of A. actinomycetemcomitans isogenic qseB single deletion (?qseB) mutant and lsrRK double deletion mutants (?lsrRK). These new vectors may offer alternatives for genetic studies in A. actinomycetemcomitans and other members of the HACEK (Haemophilus spp., A. actinomycetemcomitans, Cardiobacterium hominis, Eikenella corrodens, and Kingella kingae) group of Gram-negative bacteria. PMID:23353051

  20. 14 CFR 34.1 - Definitions.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...installation in, an aircraft. Aircraft gas turbine engine means a turboprop, turbofan... Class T3 means all aircraft gas turbine engines of the JT3D model family. Class T8 means all aircraft gas turbine engines of the JT8D model...

  1. FLUX PHASE EHL14/Aug/94 THE FLUX PHASE OF THE HALFFILLED BAND

    E-print Network

    as atoms in a solid then flux ß would corre­ spond to magnetic fields available only on neutron stars and certain bonds denoted by xy with x and y in \\Lambda and x 6= y. A positive weight jt xy j = jt yx j

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

    E-print Network

    Tritium Trapping in TFTR and JET by C.H. Skinner, C.A. Gentile, K.M. Young, J.P. Coad, J.T. Hogan, R.A. Gentile, K.M. Young, J.P. Coad1 , J.T. Hogan2 , R.-D. Penzhorn3 , N. Bekris3 Princeton Plasma Physics Lab

  3. 14 CFR 36.1 - Applicability and definitions.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... Federal Register citations affecting § 36.1, see the List of CFR Sections Affected, which appears in the...,000 pounds, except for airplanes that are powered by Pratt & Whitney Turbo Wasp JT3D series engines... powered by Pratt & Whitney Turbo Wasp JT3D series engines; and (iii) December 31, 1974, for airplanes...

  4. 14 CFR 36.1 - Applicability and definitions.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... certification procedure. Editorial Note: For Federal Register citations affecting § 36.1, see the List of CFR..., except for airplanes that are powered by Pratt & Whitney Turbo Wasp JT3D series engines; (ii) December 31... & Whitney Turbo Wasp JT3D series engines; and (iii) December 31, 1974, for airplanes with maximum weights...

  5. 14 CFR 36.1 - Applicability and definitions.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... certification procedure. Editorial Note: For Federal Register citations affecting § 36.1, see the List of CFR..., except for airplanes that are powered by Pratt & Whitney Turbo Wasp JT3D series engines; (ii) December 31... & Whitney Turbo Wasp JT3D series engines; and (iii) December 31, 1974, for airplanes with maximum weights...

  6. 14 CFR 36.1 - Applicability and definitions.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... certification procedure. Editorial Note: For Federal Register citations affecting § 36.1, see the List of CFR..., except for airplanes that are powered by Pratt & Whitney Turbo Wasp JT3D series engines; (ii) December 31... & Whitney Turbo Wasp JT3D series engines; and (iii) December 31, 1974, for airplanes with maximum weights...

  7. 14 CFR 36.1 - Applicability and definitions.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... certification procedure. Editorial Note: For Federal Register citations affecting § 36.1, see the List of CFR..., except for airplanes that are powered by Pratt & Whitney Turbo Wasp JT3D series engines; (ii) December 31... & Whitney Turbo Wasp JT3D series engines; and (iii) December 31, 1974, for airplanes with maximum weights...

  8. GTP-dependent Formation of a Ribonucleoprotein Subcomplex Required for Ribosome Biogenesis

    E-print Network

    Doudna, Jennifer A.

    GTP-dependent Formation of a Ribonucleoprotein Subcomplex Required for Ribosome Biogenesis Katrin at Berkeley, Berkeley CA 94720-3206, USA Ribosome biogenesis in eukaryotic organisms involves the coordinated assembly of 78 ribosomal proteins onto the four ribosomal RNAs, mediated by a host of trans-acting factors

  9. SCIENCEPublisher: Richard S. Nicholson Editor-in-Chief: Floyd E. Bloom

    E-print Network

    Zare, Richard N.

    L. Good James D. Watson Harry B. Gray Richard N. Zare John J. Hopfield EDITORIALI "Wired" ScienceJasny, KatrinaL. Kelner, PaulaA. Kiberstis, Linda J. Miller, L Bryan Ray, Phillip D. Szuromi, David F. Voss (San Diego), James Glanz (Chicago), Dennis Normile (Tokyo), Wade Roush (Boston) Contributing

  10. Separation of Azeotropic Mixtures: Tools for Analysis and Studies

    E-print Network

    Skogestad, Sigurd

    Eva­Katrine Hilmen A Thesis Submitted for the Degree of Dr. Ing. Norwegian University of Science project on solvent recovery in fine and specialty chemical in­ dustries in cooperation with Borregaard, Nycomed Imaging, Norsk Hydro and Dyno Industries. The project has been organized through the Fine

  11. Separation of Azeotropic Mixtures: Tools for Analysis and Studies

    E-print Network

    Skogestad, Sigurd

    Eva-Katrine Hilmen A Thesis Submitted for the Degree of Dr. Ing. Norwegian University of Science project on solvent recovery in fine and specialty chemical in- dustries in cooperation with Borregaard, Nycomed Imaging, Norsk Hydro and Dyno Industries. The project has been organized through the Fine

  12. ISSN: 1524-4563 Copyright 2008 American Heart Association. All rights reserved. Print ISSN: 0194-911X. Online

    E-print Network

    Hammock, Bruce D.

    . Hammock, Peter A. Disease Risk in the Stroke-Prone Spontaneously Hypertensive Rat Altered Soluble Epoxide at journalpermissions@lww.com 410-528-8550. E-mail: Fax:Kluwer Health, 351 West Camden Street, Baltimore, MD 21202-Prone Spontaneously Hypertensive Rat Mandi J. Corenblum, Vance E. Wise, Katrin Georgi, Bruce D. Hammock, Peter A

  13. Jahresbericht des Hochschulrates

    E-print Network

    Ferrari, Patrik L.

    1 Jahresbericht 2014 des Hochschulrates der Rheinischen Friedrich-Wilhelm-Universität Bonn #12;2 I Engels als Vorsitzender. Am 15. Juli 2014 wurde Prof. Dr. E. Jürgen Zöllner, auf Vorschlag des. Helmut Schwarz, Dr. Katrin Vernau und Prof. Dr. Dieter Engels, der zum Vorsitzenden dieser Kommission

  14. Modeling of Glucose-Insulin System Dynamics in Diabetic Goettingen Minipigs

    E-print Network

    Singh, Tarunraj

    Modeling of Glucose-Insulin System Dynamics in Diabetic Goettingen Minipigs Katrin Lunze Tarunraj of an artificial pancreas which regulates blood glucose in a closed loop framework is the ultimate goal in the treatment of diabetes. Development of a model which captures the glucose-insulin dynamic is a mandatory step

  15. Morphology-Based Language Modeling for Arabic Speech Recognition Dimitra Vergyri1

    E-print Network

    Kirchhoff, Katrin

    Morphology-Based Language Modeling for Arabic Speech Recognition Dimitra Vergyri1 , Katrin for languages with rich morphology. In this paper we investigate the use of morphology-based language models at different stages in a speech recognition system for conversational Arabic. Class- based and single

  16. Medizinische Fakultt, Dekanat, Akademische Angelegenheiten, Habilitationssekretariat Albert-Einstein-Allee 7, 89081 Ulm

    E-print Network

    Pfeifer, Holger

    Medizinische Fakultät, Dekanat, Akademische Angelegenheiten, Habilitationssekretariat Albert-Einstein, Habilitationssekretariat Albert-Einstein-Allee 7, 89081 Ulm Tel.: 0731/50-33712; Fax 0731/50-33719 Mail: katrin Angelegenheiten, Habilitationssekretariat Albert-Einstein-Allee 7, 89081 Ulm Tel.: 0731/50-33712; Fax 0731

  17. COMBINATION AND JOINT TRAINING OF ACOUSTIC CLASSIFIERS FOR SPEECH RECOGNITION

    E-print Network

    Noble, William Stafford

    COMBINATION AND JOINT TRAINING OF ACOUSTIC CLASSIFIERS FOR SPEECH RECOGNITION Katrin Kirchhoff classifier combination in speech recognition systems. We present new techniques that generalize previously of the product rule. 1. INTRODUCTION A challenge for automatic speech recognition (ASR) re­ search is to develop

  18. Mathematik fr Naturwissenschaftler, WS 2007/08 Einteilung fr die R-Klausur im CIP-Pool der Physik am 4.2.08

    E-print Network

    Keller, Gerhard

    :00 Dopichay Simon 13:00 Dürsch Verena 17:00 Emmert Hila 16:00 Fellinger Christoph 17:00 Franz Katrin 17 16:00 Schulz Kathrin 16:00 Schwarzmann Alexander 17:00 Seeling Michaela 13:00 Sendelbeck Anna 15

  19. A GLIMPSE INTO THE EYE OF THE EMERGENCY RESPONSE AT EPA KATRINA AND RITA

    EPA Science Inventory

    This presentation was given at the Texas Environmental Health Association Annual Meeting in Round Rock, TX on October 12, 2005. The keynote address was focused on the conditions after Katrins, organizing response, field response, EPA's role in emergency response, what is EPA doi...

  20. Mixed refrigerant Joule-Thomson sorption cryocoolers

    NASA Astrophysics Data System (ADS)

    Tzabar, Nir; Grossman, Gershon

    2014-01-01

    Joule-Thomson (JT) sorption cryocooling is the most mature technology for cooling from a normal Room-Temperature (RT) down to temperatures below 100 K in the absence of moving parts. Therefore, high reliability and no vibrations are attainable, in comparison with other cryocoolers. Cooling to 80 - 100 K with JT cryocoolers is often implemented with pure nitrogen. Alternatively, mixed refrigerants have been suggested for reducing the operating pressures to enable closed cycle cryocooling. There is a variety of publications describing nitrogen sorption cryocoolers with different configurations of sorption compressors. In the present research we suggest a novel sorption JT cryocooler that operates with a mixed refrigerant. Merging of sorption cryocooling and a mixed refrigerant enables the use of a simple, single stage compressor for cooling to 80 - 100 K, lower operating temperatures of the sorption cycle, and thus - reduced power consumption. In previous studies we have analyzed sorption compressors for mixed gases and mixed refrigerants for JT cryocoolers, separately. In this paper the option of mixed refrigerant sorption JT cryocoolers is explored. The considerations for developing mixed refrigerants to be driven by sorption compressors and to be utilized with JT cryocoolers are provided. It appears that, unlike with pure nitrogen, mixed refrigerants can be suitable for JT cryocooling with a single stage sorption compressor.

  1. 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

  2. Contact Information: Dr. Paul D. Baxter, Department of Statistics, University of Leeds, Leeds, LS2 9JT, UK; Phone: +44 133 343 5162; Fax: +44 133 343 5090; Email: pdbaxt@maths.leeds.ac.uk; Web: www.maths.leeds.ac.uk/pdbaxt

    E-print Network

    Baxter, Paul D.

    implying higher extreme values of rain rate occur in the data outside the one gauge-year used for parameter estimation. Figure 4: Moment scaling structure function Sq(T) for one rain gauge-year of data (solid) and for the simulated rain gauge data based on downscaling. Upper and lower quartiles from 50 downscaling simulations

  3. Please cite this article in press as: Birkholzer, J.T., et al., CO2 migration and pressure evolution in deep saline aquifers. Int. J. Greenhouse Gas Control (2015), http://dx.doi.org/10.1016/j.ijggc.2015.03.022

    E-print Network

    Zhou, Quanlin

    2015-01-01

    underground, and storing it permanently in geological reservoirs. In 2005, the IPCC Special report on carbon Saline formation a b s t r a c t In 2005, the IPPC Special report on carbon dioxide capture and storage mentioned in 2005. A large body of research has been devoted to identify and verify the main pro- cesses

  4. Discretionary Review by the Occupational Safety and Health Review Commission: Is It Necessary?

    ERIC Educational Resources Information Center

    Moran, Robert D.

    1974-01-01

    Deficiencies in the Occupational Safety and Health Review Commission (OSAHRC), a court system created to carry out adjudicatory functions under the Williams-Steiger Occupational Safety and Health Act of 1970, are exposed and alternative solutions offered. (JT)

  5. Cleidocranial dysostosis

    MedlinePLUS

    Horton WA, Hecht JT. Disorders involving transcription factors. In: Kliegman RM, Behrman RE, Jenson HB, Stanton BF, eds. Nelson Textbook of Pediatrics. 19th ed. Philadelphia, PA: Saunders Elsevier; 2011: ...

  6. 2015 Yale Physics Olympics Participating Schools Team Name Coach/Teacher School Name

    E-print Network

    Harris, Jack

    Feynman Falcons J.T. Schemm/ Mike Ecsedy Joel Barlow HS Heisenberg Mierzejewski Woodland Regional HS Tesla Anthony Fairchild Wheeler Magnet - IT Omega Rob Cormier Wolcott HS PRISMS EM Falcon Peng Tian Princeton

  7. Providing Diagnoses and Recommendations to Parents: A Behavioral Training Approach

    ERIC Educational Resources Information Center

    Munford, Paul R.; Wikler, Lynn

    1976-01-01

    Describes the use of behavioral techniques in the teaching of interviewing skills to medical students in one and one-half-hour lecture-demonstrations involving role play and discrimination training. (JT)

  8. ENVIRONMENTAL IMPACTS AND MONITORING: A HISTORICAL PERSPECTIVE ON THE USE OF NATURAL ATTENUATION FOR SUBSURFACE REMEDIATION: BOOK CHAPTER

    EPA Science Inventory

    BOOK CHAPTER NRMRL-ADA-01128 West, CC, and Wilson*, J.T. "Environmental Impacts and Monitoring: A Historical Perspective on the Use of Natural Attenuation for Subsurface Remediation." In: Environmental Chemistry: Fate, ...

  9. Achondrogenesis

    MedlinePLUS

    Horton WA, Hecht JT. Disorders involving ion transporters. In: Kliegman RM, Behrman RE, Jenson HB, Stanton BF, eds. Nelson Textbook of Pediatrics. 19th ed. Philadelphia, PA: Saunders Elsevier; 2011: ...

  10. 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)

  11. Providing a Re-Entry Bridge for Women: A Need-Centered Continuing Education Program

    ERIC Educational Resources Information Center

    Elshof, Annette Ten; Konek, Carol

    1977-01-01

    Elements of a successful college-based continuing education program for women are examined individually: Recruitment and admission, orientation, services (financial support, day care, counseling, career planning, support groups, and transition programs), curriculum, and administrations. (JT)

  12. Bookstores and Profits

    ERIC Educational Resources Information Center

    College Store Journal, 1975

    1975-01-01

    Guidelines by the National Association of College Stores for making academically oriented bookstores financially viable with suggested alternative ways of implementing the guidelines (e.g. retail business, subsidized service, etc.) (JT)

  13. Organizing for Accountability

    ERIC Educational Resources Information Center

    Bennis, Warren

    1975-01-01

    A college president challenges personnel administrators to play a leadership role in human resource management. Notes the need for career development programs for middle managers particularly and recommends an organizational development approach to faculty and staff career development. (JT)

  14. Modal Semantics for Knowledge Bases Dealing with Vague Concepts

    E-print Network

    Leeds, University of

    of Artificial Intelligence School of Computer Studies University of Leeds, Leeds LS2 9JT, England brandon; an extremely serious threat to this enterprise. Since ordinary language concepts are vague it is very easy

  15. Birth control and family planning

    MedlinePLUS

    ... to have children in the future. They include vasectomy and tubal ligation. These procedures can sometimes be reversed if a ... 26. Jensen JT, Mishell DR. Family planning: contraception, sterilization, and pregnancy termination. In: Lentz GM, Lobo RA, ...

  16. Predictions for neutrino structure functions.

    E-print Network

    Kretzer, S.; Olness, Frederick I.; Scalise, R. J.; Thorne, Robert S.; Yang, U. K.

    - sity, Nevis-292 (1997). 3. L. W. Whitlow, E. M. Riordan, S. Dasu, S. Rock and A. Bodek, Phys. Lett. B282, 475 (1992). 4. C. Boros, F.M. Steffens, J.T. Londergan and A.W. Thomas, Phys. Lett. B468, 161 (1999). 5. W. T. Giele, S. Keller and E. Laenen, Nucl... . Roberts, W. J. Stirling and R. S. Thorne, Eur. Phys. J. C18, 117 (2000). 31. C. Boros, F.M. Steffens, J.T. Londergan and A.W. Thomas, Phys. Lett. B468, 161 (1999); C. Boros, J.T. Londergan, A.W. Thomas, Phys. Rev. D59, 074021 (1999); C. Boros, J.T. Lon...

  17. The Laboratory As an Element in Social Work Curriculum Design

    ERIC Educational Resources Information Center

    Burian, William A.

    1976-01-01

    Presents a model combining videotape and other media for integration into social work curriculum design as part of the on-campus laboratory, a skill training and practice center, which assists with the interface of classroom and field education. (JT)

  18. Study on a Miniature Mixed-gases Joule-Thomson Cooler Driven by an Oil-lubricated Mini-compressor for 120 K Temperature Ranges

    NASA Astrophysics Data System (ADS)

    Gong, M. Q.; Wu, J. F.; Yan, B.; Zou, X.; Zhuang, X. R.; Hu, Q. G.

    In this paper, a miniature J-T cooler using multicomponent mixtures was developed and tested, in which an oil-lubricated mini-compressor was used. Experimental tests on the performance of the miniature J-T cooler were carried out with two kinds of recuperative heat exchangers. One is a shell-and-tube heat exchanger, and the other is a plate-fin type recuperative heat exchanger with whereas a micro-channel configuration fabricated by the wire-electrode cutting method. The former one gave a no-load minimum temperature of 140 K, while the later one showsbetter performance. No-load minimum temperature of 110 K and about 4 W cooling capacity at 118 K were achieved with the plate-fin micro J-T cooler. Such miniature J-T coolers driven by oil-lubricated mini-compressors show good prospects in many applications.

  19. EPR Studies of orthorhombic Jahn-Teller effect in single crystal of ferroelectric Cu(II):Cd2(NH4)2 (SO4)3

    NASA Astrophysics Data System (ADS)

    Benson, Yerima; de, Dilip

    In this paper we report the first EPR observation and theoretical explanation of orthorhombic Jahn-Teller effect in Cu(II) doped single crystal of ferroelectric cadmium ammonium sulphate: Cu(II):Cd2(NH4)2 (SO4)3 . The isotropic EPR spectra of the 2D ion (in regular octahedral symmetry) at higher temperature becomes anisotropic at low temperature with clear manifestation of orthorhombic g and hyperfine tensors at 15 K. The static Jahn-Teller(JT) effect can only be explained theoretically by assuming the three JT potential wells energetically inequivalent, unlike the potential wells in most of the Cu(II) doped crystalline materials where JT effect manifests. The measured splitting of the JT potential wells in this ferroelectric crystal fall in the sub millimeter wave region pointing to possible application of the material.

  20. Persistence of double-stranded RNA in insect hemolymph as a potential determiner of RNA interference success: Evidence from Manduca sexta

    E-print Network

    Belles, Xavier

    of Edinburgh, Kings Buildings, Ashworth Laboratories, West Mains Road, Edinburgh EH9 3JT, UK c Institut de by Di- cer-2, a type III RNase III enzyme, into RNA duplexes 21­23 nucleo- tides in length with 2

  1. Teaching by Telephone: The Problems of Teaching Without the Visual Channel

    ERIC Educational Resources Information Center

    Short, John

    1974-01-01

    Observations and research on telephone communication as opposed to face-to-face and closed circuit TV communication are examined, and telephone's advantages and disadvantages are listed with the conclusion that it can constitute an acceptable complementary teaching approach. (JT)

  2. The Colleges and the Bicentennial: Campus Monuments and Mementos

    ERIC Educational Resources Information Center

    Thelin, John R.

    1976-01-01

    In a salute to 200 years of America and academia the author concludes that for all the anniversary's shaky antiquarianism, the prospects facing liberal arts colleges are no more bleak than in 1876. (JT)

  3. Molly. A. Nikolas August 2012

    E-print Network

    and Adults with Attention-Deficit/Hyperactivity Disorder (CHADD) Young Scientist Research Award 2009, J.T. (in press). Neuropsychological performance and attention- deficit hyperactivity disorder Dissertation: "Youth Appraisals of Marital Conflict and Genetic Risk for Attention-Deficit Hyperactivity

  4. Atmos. Chem. Phys., 12, 38213835, 2012 www.atmos-chem-phys.net/12/3821/2012/

    E-print Network

    Meskhidze, Nicholas

    , School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK 4Jet Propulsion Laboratory in the presence of polar strato- spheric clouds (PSCs) (Solomon et al., 1986). Although not as large

  5. 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.

  6. GenePool Information Sheet #3 v2 The Gene Pool (The University of Edinburgh Sequencing Facility)

    E-print Network

    Facility) Ashworth Laboratories, King's Buildings, Edinburgh, Scotland EH9 3JT, UK phone 0131 6513633. The first is `in vitro' cloning, the amplification of single target DNA molecules by solid phase PCR

  7. GenePool Information Sheet #1 v2 The Gene Pool (The University of Edinburgh Sequencing Facility)

    E-print Network

    Facility) Ashworth Laboratories, King's Buildings, Edinburgh, Scotland EH9 3JT, UK phone 0131 6513633 analysis only (we run your completed reactions) to full shotgun analysis of large insert clones (including

  8. 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)

  9. Journal of Virological Methods 209 (2014) 3540 Contents lists available at ScienceDirect

    E-print Network

    Lamond, Angus I.

    2014-01-01

    of Biological Sciences, University of Leeds, Leeds LS2 9JT, UK c The Pirbright Institute, Ash Road, Pirbright to a bi-functional fluorescent/antibiotic resistance fusion protein (green fluorescent protein

  10. Emerging Consequences of Financing Private Colleges with Public Money

    ERIC Educational Resources Information Center

    Smith, Michael R.

    1975-01-01

    The question of public aid to private colleges is analyzed in historical perspective and in terms of current trends and future outlook followed by a presentation of applicable federal and state supreme court decisions. (JT)

  11. Building Energy in China: Forward to Low-Carbon Economy 

    E-print Network

    Weiding, L.

    2008-01-01

    ! ~ J i !p' fo-. 'fJt ~ .. LOL...-_........._....I....- ..Io....- .......... ]950 Documents and Statements ? China National Plan for Coping with Climate Change; ? National Assessment Report on Climate Change; ? "We should ensure that both production...

  12. Joule-Thomson Expander Without Check Valves

    NASA Technical Reports Server (NTRS)

    Chan, C. K.; Gatewood, J. R.

    1989-01-01

    Cooling effected by bidirectional, reciprocating flow of gas. Type of Joule-Thomson (J-T) expander for cryogenic cooling requires no check valves to prevent reverse flow of coolant. More reliable than conventional J-T expander, containing network of check valves, each potential source of failure. Gas flows alternately from left to right and right to left. Heat load cooled by evaporation of liquid from left or right compartment, whichever at lower pressure.

  13. Interaction of the 2E(D) state of Co 2+ with a jahn-teller active mode in [N(CH 3) 4] 2CoCl 4

    NASA Astrophysics Data System (ADS)

    Laiho, R.; Treshchalov, A.

    1981-06-01

    The transition 4A 2 ? 2E of Co 2+ has been investigated in [N(CH 3) 4] 2CoCl 4 using optical absorption and magnetic circular dichroism. Three groups of lines with 274 cm -1 progressions were observed. The structure of the spectra indicates a J-T interaction in the 2E state with strong depression of the frequency of the J-T active mode. The ground-state splitting is 7.2 cm -1.

  14. 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

    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.

  15. Dynamic Raman spectroscopy of hydrogen isotopomer mixtures in-line at TILO

    NASA Astrophysics Data System (ADS)

    Lewis, R. J.; Telle, H. H.; Bornschein, B.; Kazachenko, O.; Kernert, N.; Sturm, M.

    2008-07-01

    The pure rotational and vibration-rotational Stokes Raman spectra of flowing gaseous mixtures of the hydrogen isotopomers H2, HD, and D2 were measured in order to test the performance of the proposed tritium purity monitoring system designed for the Karlsruhe Tritium Neutrino (KATRIN) mass experiment, which utilises 532 nm CW laser excitation and fibre-coupled scattered light collection, exploiting 90° excitation observation geometry. Short (100-300 s) exposure times were used to simulate the real-time in-line measurement of hydrogen isotopomer composition at the low (~ 100-150 mbar) pressure required for KATRIN. At 100 s exposure time, an in-line sensitivity of better than 1% was achieved for dynamic changes in the sample gas composition.

  16. 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.

  17. Exact relativistic {beta} decay endpoint spectrum

    SciTech Connect

    Masood, S. S.; Nasri, S.; Schechter, J.; Tortola, M. A.; Valle, J. W. F.

    2007-10-15

    The exact relativistic form for the {beta} decay endpoint spectrum is derived and presented in a simple factorized form. We show that our exact formula can be well approximated to yield the endpoint form used in the fit method of the KATRIN Collaboration. We also discuss the three-neutrino case and how information from neutrino oscillation experiments may be useful in analyzing future {beta} decay endpoint experiments.

  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. Joule-Thomson cryogenic cooler with extremely high thermal stability

    NASA Technical Reports Server (NTRS)

    Bard, Steven; Wu, J. J.; Trimble, Curt

    1991-01-01

    An 80-K Joule-Thomson (J-T) cooling system designed for the Probe Infrared Laser Spectrometer (PIRLS) proposed for the Huygens Titan Probe of the Cassini Saturn orbiter mission is presented. The cryogenic cooling requirements of the PIRLS instrument are listed, and the cooler system design including details of a J-T cryostat, cold head, and dewar design is described along with the results of a thermal modeling effort and lab cooler performance testing. It is shown that by using active feedback temperature control of the cold head in combination with the self-regulating action of the J-T cryostat, a temperature stability of less than 0.1 mK/min is achieved by the cooler weighting 1.8 kg.

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

    SciTech Connect

    Shirai, Koun; Ishisada, Jun

    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.

  1. Potential improvements in turbofan engine fuel economy

    NASA Technical Reports Server (NTRS)

    Hines, R. W.; Gaffin, W. O.

    1976-01-01

    The method developed for initial evaluation of possible performance improvements in the NASA Aircraft Energy Efficiency Program, directed toward improving the fuel economy of turbofan engines, is outlined, and results of the evaluation of 100 candidate engine modifications are presented. The study indicates that fuel consumption improvements of as much as 5% may be possible in current JT3D, JT8D, and JT9D turbofan engines. Aerodynamic, thermodynamic, material, and structural advances are expected to yield fuel consumption improvements on the order of 10 to 15% in advanced turbofan engines, with the greatest improvement stemming from significantly higher cycle pressure ratios. Higher turbine temperature and fan bypass ratios are also expected to contribute to fuel conservation.

  2. NASA ECI programs - Benefits to Pratt and Whitney engines

    NASA Technical Reports Server (NTRS)

    Gaffin, W. O.

    1982-01-01

    Proprietary research conducted under the NASA-sponsored Engine Component Improvement program is shown to have advanced the state of such component technologies as thermal barrier coatings, ceramic seal systems, advanced turbine clearance control, and JT9D engine fan design. In addition, the tests conducted have demonstrated the advantages of updated cooling, sealing and aerodynamic designs in the high pressure turbine and compressor of the JT8D engine. These technological advances are being transferred to such novel engine configurations as the PW2037 and NASA Energy Efficient Engine. Attention is given to the results of the thermal coating refinement tests of convectively cooled vanes, and to the development of a single shroud fan design applicable to the JT9D and next-generation engines.

  3. The impact of rainfall and school break time policies on physical activity in 9-10 year old British children: a repeated measures study

    E-print Network

    Harrison, Flo; Jones, Andrew P.; Bentham, Graham; van Sluijs, Esther M. F.; Cassidy, Aedin; Griffin, Simon J.

    2011-05-24

    , and area calculated in a GIS. d Free school meals are available to children from low-income families. e Index of Multiple Deprivation score 2007 for the lower super output area the school falls within.. Table 1 Characteristic of study participants Mean... , Norwich, NR4 7JT, UK. 2Medical Research Council Epidemiology Unit, Institute of Metabolic Science, Box 285, Addenbrookes Hospital, Hills Road, Cambridge, CB2 0QQ, UK. 3School of Medicine, University of East Anglia, Norwich, NR4 7JT, UK. Authors...

  4. Nacelle Aerodynamic and Inertial Loads (NAIL) project. Appendix B

    NASA Technical Reports Server (NTRS)

    1981-01-01

    The testing was conducted on the Boeing-owned 747 RA001 test bed airplane during the concurrent 767/JT9D-7R4 engine development program. Following a functional check flight conducted from Boeing Field International (BFI) on 3 October 1980, the airplane and test personnel were ferried to Valley Industrial Park (GSG) near Glasgow, Montana, on 7 October 1980. The combined NAL and 7670JT9D-7R4 test flights were conducted at the Glasgow remote test site, and the airplane was returned to Seattle on 26 October 1980.

  5. 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.

  6. Analysis of the Three-dimensional Superradiance Problem and Some Generalizations 

    E-print Network

    Sen Gupta, Indranil

    2011-10-21

    and substituting (II.3) into (II.1) gives ??j(t) = ? ? k N? l=1 ? t 0 dt?g2k?l(t?) exp[i(?k ? ?)(t? ? t) + ik ? (rj ? rl)]. (II.4) (II.4) can be reduced to ??j(t) = ?? N? l=1 fjl?l(t), (II.5) where fjl = sin(k0|rj?rl|)(k0|rj?rl|) , k0 = ?c... and and ? is the single atom spontaneous decay rate given by ? = Vphk20 pic g2k0. Now (II.5) can be written in the following matrix form ?B = ??FB, (II.6) where B = ? ? ? ? ?? ? ? ? ?? ? ? ??? ?1(t) ?2(t) . . . ?N...

  7. Power Conversion and Energy Storage System for a Fusion Reactor 3. Performance of Large Electric Power Equipment and Future View 3.5 Latest Technical Trend of Lower Loss Electric Power Conversion Equipment

    NASA Astrophysics Data System (ADS)

    Sato, Yoshihisa

    This paper introduces the loss reduction technology for power supply. Design and manufacture of the power supply for JT-60 was carried out using the high-power thyristor. Although the power supply for JT-60 was high-voltage and large-current, the power supply for ITER or a future nuclear fusion reactor system will be a low-voltage large-current type. It is very important to study the latest technical trend in low loss electric power conversion equipment using turn-off type power devices.

  8. NASA/Pratt and Whitney experimental clean combustor program: Engine test results

    NASA Technical Reports Server (NTRS)

    Roberts, R.; Fiorentino, A. J.; Greene, W.

    1977-01-01

    A two-stage vorbix (vortex burning and mixing) combustor and associated fuel system components were successfully tested in an experimental JT9D engine at steady-state and transient operating conditions, using ASTM Jet-A fuel. Full-scale JT9D experimental engine tests were conducted in a phase three aircraft experimental clean combustor program. The low-pollution combustor, fuel system, and fuel control concepts were derived from phase one and phase two programs in which several combustor concepts were evaluated, refined, and optimized in a component test rig. Significant pollution reductions were achieved with the combustor which meets the performance, operating, and installation requirements of the engine.

  9. Behavioral Ecology doi:10.1093/beheco/arq209

    E-print Network

    West, Stuart

    3JT, UK Although most animals employ strategies to avoid costly escalation of conflictBehavioral Ecology doi:10.1093/beheco/arq209 Lethal combat over limited resources: testing remains unclear; moreover, few systems allow all variables to be experimentally investigated, making tests

  10. Information Granulation for Web based Information Retrieval Support Systems

    E-print Network

    Yao, JingTao

    Information Granulation for Web based Information Retrieval Support Systems J.T. Yao Y.Y. Yao of Web based information retrieval support systems (IRSS). In particular, we apply clustering methods granulation, Information retrieval support systems 1. INTRODUCTION The Internet and the Web offer new

  11. Bookstore in Trouble: The Proverbial Iceberg

    ERIC Educational Resources Information Center

    Sanderson, Ivan L.

    1975-01-01

    Examines the plight of two troubled bookstores, both state system stores with state charters as nonprofit corporations, probing some of their weaknesses, failures, and resultant difficulties and the positive action, including structural change and new management, involved in recovery and restoration of adequate operating funds. (JT)

  12. THE BLOODFEEDINGHABITS OF CT-]LEXTERRITAI]SWALKER \\\\"\\YNlr T. (ll{ANS

    E-print Network

    -rnsrvick,Ncrv Jt'rstl' INTRODUCTION Culex territans Walker is generally acknowledged to derive the rnajorit-rdedin the sero- l0si'ial series. RESULTS Sl.Rrlr-octc,q,r.DErL,n\\rrNATroNS. The re- sults of jr5 bloocl

  13. DeFunis Symposium: DeFunis, An Introduction

    ERIC Educational Resources Information Center

    Henkin, Louis

    1975-01-01

    This introduction to a series of five articles in this issue (vol. 75, no. 3) points up the need for "applied" as well as theoretical consideration of the implications of the DeFunis v. Odegaard case. Discusses policy which legislators, in regulating legal education, may pursue consistently with equal protection. (JT)

  14. Quantitative Phase-Field Modelling of Solidification at High Lewis Number , P.K. Jimack

    E-print Network

    Jimack, Peter

    Quantitative Phase-Field Modelling of Solidification at High Lewis Number J. Rosam* , P.K. Jimack LS2-9JT, UK. Abstract A phase-field model of non-isothermal solidification in dilute binary alloys structures during solidification has been a subject of enduring interest within the scientific community

  15. 10.1261/rna.1517209Access the most recent version at doi: 2009 15: 1012-1020 originally published online April 15, 2009RNA

    E-print Network

    Meyer, Peter

    hybrida using a 59-ligation dependent and a 59-ligation independent approach. The two libraries were LS2 9JT, United Kingdom ABSTRACT Two pools of small RNAs were cloned from inflorescences of Petunia clones. The library contains 15 clones with 100% identity and 53 clones with one mismatch to mi

  16. 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)

  17. 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

  18. 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

  19. 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

  20. 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

  1. 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

  2. DTP | Toxicology and Pharmacology Branch (TPB)

    Cancer.gov

    Liao, J.T., T.N. Merriman, E.M. Daniel, M.A. Stedham, A.C. Smith and J.E. Tomaszewski, 1991. The Effect of Intravenous Buthionine Sulfoximine (NSC-326231) on Carboplatin (NSC-241240) Induced Toxicity in Mice.

  3. BMC Evolutionary Biology This Provisional PDF corresponds to the article as it appeared upon acceptance. The fully-formatted

    E-print Network

    Tang, Jijun

    @cse.sc.edu) Linda Rymarquis (lar24@cornell.edu) David B. Stern (ds28@cornell.edu) Claude W. dePamphilis (cwd3@psu: lswang@med.upenn.edu JT: jtang@cse.sc.edu LR: lar24@cornell.edu DBS: ds28@cornell.edu CWD: cwd3@psu

  4. Journal of Turbulence Vol. 13, No. 35, 2012, 116

    E-print Network

    École Normale Supérieure

    -Marseille Universit´e, Marseille Cedex 13, France; c LMFA-CNRS, Ecole Centrale de Lyon, Universit´e de Lyon, Ecully of homogeneous turbulence Frank G. Jacobitza , Kai Schneiderb , Wouter J.T. Bosc , and Marie Farged a Mechanical Cedex, France; d LMD-IPSL-CNRS, Ecole Normale Sup´erieure, Paris Cedex 5, France (Received 30 November

  5. Hindawi Publishing Corporation Journal of Biomedicine and Biotechnology

    E-print Network

    Allen, Judith

    . Findings from many different labs illustrate that macrophages in helminth infection can act as anti-parasite cytokine profiles, the unique immunological profile associated with helminth infection has been explained & Infection Research, University of Edinburgh, Edinburgh EH9 3JT, UK Correspondence should be addressed

  6. T cells in helminth infection: the regulators and the regulated

    E-print Network

    T cells in helminth infection: the regulators and the regulated Matthew D. Taylor, Nienke van der Werf and Rick M. Maizels Institute of Immunology and Infection Research, University of Edinburgh, Ashworth Laboratories, West Mains Road, Edinburgh EH9 3JT, UK Helminth parasites survive through

  7. Helminth parasites masters of Rick M. Maizels

    E-print Network

    Helminth parasites ­ masters of regulation Rick M. Maizels Adam Balic Natalia Gomez-Escobar Meera-Escobar, Meera Nair, Matt D. Taylor, Judith E. Allen, Institute of Immunology and Infection Research, School of Immunology and Infection Research Ashworth Laboratories, West Mains Road University of Edinburgh, EH9 3JT, UK

  8. Geophys. J. Int. (0000) 000, 000000 Gross Thermodynamics of 2-component Core Convection

    E-print Network

    Gubbins, David

    Sciences, University of Leeds, Leeds LS2 9JT, UK© Research School of Earth Sciences, Birkbeck College Gubbins ¢¡ , Dario Alf`e £¥¤¦ , Guy Masters § G. David Price £ and Michael Gillan ¦ ¨ School of Earth, University of California, San Diego, La Jolla, CA 92093-0225, USA Physics and Astronomy Department

  9. Water Resources Research Center Annual Technical Report

    E-print Network

    carbon input drives CO2 output from lake ecosystems. In review, Oecologia. 2. Lennon, J.T. Sources (including zooplankton and fish) and determine whether lake ecosystems act as sources or sinks of CO2. Our;Linking Lakes with the Landscape: The Fate of Terrestrial Organic Matter in Planktonic Food Webs Basic

  10. Water Resources Research Center Annual Technical Report

    E-print Network

    1. Lennon, J.T., 2004, Experimental evidence that terrestrial carbon subsidies increase CO2 flux as sources or sinks of CO2. Our project addresses three main factors that influence terrestrial carbon flow. Research Program #12;Linking Lakes with the Landscape: The Fate of Terrestrial Organic Matter in Planktonic

  11. Atmos. Chem. Phys., 9, 20212033, 2009 www.atmos-chem-phys.net/9/2021/2009/

    E-print Network

    Meskhidze, Nicholas

    10 5DD, UK 2Institute for Transport Studies, University of Leeds, Leeds, LS2 9JT, UK *now at: School ­ Published: 20 March 2009 Abstract. During the TORCH campaign a zero dimensional box model based were fitted to OH radical concentrations using TORCH data, the first using measured OH data

  12. Atmos. Chem. Phys., 7, 167181, 2007 www.atmos-chem-phys.net/7/167/2007/

    E-print Network

    Meskhidze, Nicholas

    modelling studies during the UK TORCH Campaign in Summer 2003 K. M. Emmerson1,**, N. Carslaw1, D. C. Carslaw, York, YO10 5DD, UK 2Institute for Transport Studies, University of Leeds, Leeds, LS2 9JT, UK 3 CHemistry experi- ment (TORCH) took place during the heatwave of summer 2003 at Writtle College, a site 2

  13. Writer's Eye 2013 Award Winners Elementary School Grades 35

    E-print Network

    Acton, Scott

    School J. R. Bauer Charlottesville Catholic School Chloe Romberger Tandem Friends School Margaret Dagli J.T. Henley Middle School 3rd Carmen Day Buford Middle School HM Jenna Benzing Wilson Middle Albemarle High School Max Park Woodberry Forest School Katherine DeLoria Albemarle High School Cara O

  14. Rates and Fitness Consequences of New Mutations in Humans

    E-print Network

    Keightley, Peter

    REVIEW Rates and Fitness Consequences of New Mutations in Humans Peter D. Keightley1 Institute of Evolutionary Biology, School of Biological Sciences, University of Edinburgh, Edinburgh EH9 3JT, United Kingdom ABSTRACT The human mutation rate per nucleotide site per generation (m) can be estimated from data

  15. The Use of Computer-Based Data Banks in the Teaching of Clinical Problem-Solving and Medical Case Management to Veterinary Students

    ERIC Educational Resources Information Center

    Conzelman, Gaylord M.; And Others

    1975-01-01

    Describes a program at the School of Veterinary Medicine, University of California at Davis to give students experience in diagnosis and management of urinary tract diseases. Students request from computer data banks that laboratory information they deem most useful in the medical management of each clinical problem. (JT)

  16. This is the pre-peer reviewed version of the following article: Randell, R., Ruddle, R., Quirke, P., Thomas, R. and Treanor, D. Working at the microscope: analysis of

    E-print Network

    Berzins, M.

    Brenner Building, St. James's University Hospital, Leeds LS9 7TF, UK b School of Computing, University of Leeds, LS2 9JT, UK c St. James's University Hospital, Leeds Teaching Hospitals NHS Trust Corresponding the current work practice of histopathologists in order to inform the design of digital microscopy systems

  17. Physics of alpha channelling and related TFTR experiments

    E-print Network

    waves [2]. The lower hybrid current drive effect was demonstrated first on small tokamaks, including the Versator, WT-2 and PLT tokamaks. Up to 3 MA have been driven by lower hybrid waves on the JT-60 tokamak cyclotron frequency regime (10­100 MHz), the lower hybrid frequency regime (1­ 10 GHz) and the electron

  18. 77 FR 16916 - Airworthiness Directives; Pratt & Whitney (PW)Turbofan Engines

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-03-23

    ... engine models. We agree. In addition to the JT9D-7R4G2 and -7R4H1 engines, the NPRM (76 FR 72348... NPRM published in the Federal Register on November 23, 2011 (76 FR 72348). That NPRM proposed to... Written The Boeing Company and an individual commenter support the NPRM (76 FR 72348, November 23,...

  19. International Journal of Biological Macromolecules 41 (2007) 146153 Adsorption of DNA onto positively charged amidine colloidal

    E-print Network

    Cambridge, University of

    2007-01-01

    QD, UK c School of Biochemistry and Microbiology, University of Leeds, Leeds, West Yorkshire LS2 9JT) with amidine functionalised sub-micron latex spheres (positively charged) was studied using dynamic light packaging within cells. Motivation for the current work stems from the growing body of theoretical

  20. Development of a Computational Paradigm for Laser Treatment of Cancer

    E-print Network

    . According to the American Cancer Society [1], prostate cancer is respon- sible for 33% of the cancer deathsDevelopment of a Computational Paradigm for Laser Treatment of Cancer J.T. Oden1 , K.R. Diller2 , C Cancer Center, Department of Diagnostic Radiology, Houston TX 77030, USA {jhazle, jstafford

  1. Equal Employment + Equal Pay = Multiple Problems for Colleges and Universities

    ERIC Educational Resources Information Center

    Steinbach, Sheldon Elliot; Reback, Joyce E.

    1974-01-01

    Issues involved in government regulation of university employment practices are discussed: confidentiality of records, pregnancy as a disability, alleged discrimination in benefits, tests and other employment criteria, seniority and layoff, reverse discrimination, use of statistics for determination of discrimination, and the Equal Pay Act. (JT)

  2. Estimating overdispersion in the assessment of crime reduction interventions Paul R. Marchant, Leeds Metropolitan University, School of Information m

    E-print Network

    Barber, Stuart

    , Leeds Metropolitan University, School of Information m Management, Leeds, LS6 3QS; email: p.marchant@leedsmet.ac.uk; phone: 0113 283 6109; fax: 0113 283 7599 Paul D. Baxter* and Stuart Barber, University of Leeds, Department of Statistics, Leeds LS2 9JT; email: pdbaxt@maths.leeds.ac.uk, stuart@maths.leeds.ac.uk; phone

  3. The Leeds Arabic Discourse Treebank: Annotating Discourse Connectives for Amal Al-Saif, Katja Markert

    E-print Network

    Markert, Katja

    The Leeds Arabic Discourse Treebank: Annotating Discourse Connectives for Arabic Amal Al-Saif, Katja Markert School of Computing University of Leeds, Leeds, UK, LS2 9JT assaif@comp.leeds.ac.uk, markert@comp.leeds.ac.uk Abstract We present the first effort towards producing an Arabic Discourse

  4. REFEREE'S REPORT Confidential Reference for an Applicant for admission to study an Undergraduate, Postgraduate Taught or Research course at the University of Leeds.

    E-print Network

    Rzepa, Henry S.

    , Postgraduate Taught or Research course at the University of Leeds. Please note, the Applicant must complete of Leeds, Leeds, England, LS2 9JT Section A ­ to be completed by the Applicant Section B ­ to be completed at the University of Leeds and has named you as a Referee. We would be most grateful if you could let us know

  5. Selection for high and low virulence in the malaria parasite Plasmodium chabaudi

    E-print Network

    Read, Andrew

    * and A. F. Read Institute of Cell, Animal and Population Biology, University of Edinburgh,West Mains Road, Edinburgh EH9 3JT, UK What stops parasites becoming ever more virulent? Conventional wisdom and most increasing host exploitation. Here we test this prediction by imposing arti¢cial between-host selection

  6. The Future of Diversity in a Time of Retrenchment

    ERIC Educational Resources Information Center

    Riesman, David

    1975-01-01

    Less obvious reasons for the decline of private educational institutions are discussed and suggestions made as to what type is most durable. The author supports the idea of an Educational Opportunity Bank to provide student loans and analyzes it with respect to maintenance of diversity, quality, and student choice. (Editor/JT)

  7. ARCHITECTURE AND EQUIPMENT FOR THE LANGUAGE LABORATORY.

    ERIC Educational Resources Information Center

    BRUBAKER, CHARLES WILLIAM

    A SERIES OF BRIEF DISCUSSIONS ARE GIVEN OF LANGUAGE LABORATORIES WITH RESPECT TO--(1) HOW STUDENTS USE THE FACILITIES, (2) COMPONENTS, (3) GROUP USE AND INDIVIDUAL STUDY, (4) SCHEDULING IN A CURRICULUM, (5) LOCATION IN THE SCHOOL, (6) DESIGN OF THE FACILITIES, (7) RECENT DEVELOPMENTS, AND (8) FUTURE PROJECTION. (JT)

  8. What's Cooking at the Restaurant School

    ERIC Educational Resources Information Center

    Binzen, Peter

    1975-01-01

    Describes the operation and program of the Restaurant School in Philadelphia, which in a one-year course of formal instruction and on-the-job training teaches students how to own and operate small restaurants and invests in the restaurants of some of its graduates. (JT)

  9. 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.

  10. Present a$liation: National Risk Management Research Laboratory, USEPA MD-63, Research Triangle Park, NC

    E-print Network

    Aneja, Viney P.

    Park, NC 27711, USA *Corresponding author. Tel.: #1-919-515-3711; fax: #1- 919-515-7802. E-mail addresses: walker.johnt@epamail.epa.gov (J.T. Walker), viney}aneja@ncsu.edu (V.P. Aneja). Atmospheric Environment 34 (2000) 3407}3418 Atmospheric transport and wet deposition of ammonium in North Carolina John T

  11. Time Management in Higher Education Administration: A Case Study

    ERIC Educational Resources Information Center

    Lewis, Darrell R.; Dahl, Tor

    1976-01-01

    Drawing on data from a staff development project for administrators in a college at a major American university, it was determined that there is considerable commonality across individuals and that it is possible to deal with such issues as time management, job stress, and enjoyment on an organizational level. (Editor/JT)

  12. Proceedings of Student-Faculty Research Day, CSIS, Pace University, May 3rd Developing a Quantum Key Distribution Simulator

    E-print Network

    Tappert, Charles

    a Quantum Key Distribution Simulator Sam Aybar, Richard Harrison, Inti Sairitupa, Jay Thomas, and Ronald I, jt11701p, rfrank}@pace.edu Abstract Quantum Key Distribution allows for the secure transmission encryption methods insecure. This paper details the upgrading of a Quantum Key Distribution simulator

  13. Neoclassical simulations of fusion alpha particles in pellet charge exchange experiments on the Tokamak Fusion Test Reactor

    E-print Network

    Redi, Martha H.

    and neutron emission. Furthermore, guiding center codes are able to match the global loss rates of fusion Upgrade (JT-60U) [2]. Both these observations support the assertion that suprathermal ions behave leading to a more economical reactor design. The paper is divided into four sections. In Section II

  14. Neoclassical simulations of fusion alpha particles in pellet charge exchange experiments on the Tokamak Fusion Test Reactor

    E-print Network

    , guiding center codes are able to match the global loss rates of fusion products inferred from triton burnup experiments at JT­60U [2]. Both these observations support the assertion that suprathermal ions minimized reactor and magnetic coil system size leading to a more economical reactor design. The paper

  15. Neoclassical simulations of fusion alpha particles in pellet charge exchange experiments on the Tokamak Fusion Test Reactor

    E-print Network

    , guiding center codes are able to match the global loss rates of fusion products inferred from triton burnup experiments at JT-60U [2]. Both these observations support the assertion that suprathermal ions minimized reactor and magnetic coil system size leading to a more economical reactor design. The paper

  16. Vaginal sponge and spermicides

    MedlinePLUS

    ... and vaginal sponges are two over-the-counter birth control methods used during sex to prevent pregnancy. Over-the- ... Linares AC, Schutt-Aine AI. Contraception. In: Rakel RE, ed. Textbook ... PA: Saunders Elsevier; 2011:chap 26. Jensen JT, Mishell DR. ...

  17. A Multidisciplinary Introduction to Community Medicine and Behavioral Science

    ERIC Educational Resources Information Center

    Turton, Frederick; Marine, William

    1975-01-01

    Emery School of Medicine's freshman behavioral science course, which includes units on medical care, psychiatry, and epidemiology, is directed toward attitude formation as well as intellectual development. Units and field experiences are described and evaluated and the course impact over a 4-year period found to be positive. (JT)

  18. Quantitative evaluation of general corrosion of Type 304 stainless steel in subcritical and

    E-print Network

    Benning, Liane G.

    Sciences, University of Leeds, Leeds LS2 9JT, UK e Department of Materials Science and Engineering.elsevier.com/locate/corsci Corrosion Science 44 (2002) 841±860 * Corresponding author. Fax: +1-814-865-3573. E-mail address: xxz15@psu to the low corrosion rate of Type 304 SS and 150°C. Ó 2002 Elsevier Science Ltd. All rights reserved

  19. Curriculum Vitae: Barbara Muhling Princeton University and NOAA Geophysical Fluid Dynamics Laboratory

    E-print Network

    Rodgers, Keith

    of global warming on the Intra-Americas Seas: Part 2: Implications #12;2 for Atlantic bluefin tuna Australia · Describe fish biodiversity on eastern Indian Ocean temperate reefs Peer-Reviewed Publications, D.B., Muhling, B.A., Lamkin, J.T., Muller-Karger, F., Roffer, M.A. (2015) Potential impact of global

  20. 75 FR 39046 - Notice of Determinations Regarding Eligibility To Apply for Worker Adjustment Assistance

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-07-07

    ...,041 Eldec Corporation, Lynnwood, WA......... May 4, 2009. Subsidiary of Crane Company, Volt Management... America Team. 73,766 JT Sports, LLC Neosho, MO 74,024 Hewlett-Packard Company, Omaha, NE Division of... Transitional Living Racine, WI. Services, Inc., Starting Over Services Crisis Center....

  1. Laboratory evolution of polyandry in the parasitoid wasp Nasonia vitripennis

    E-print Network

    West, Stuart

    Studies, University of Groningen (Received 30 June 2006; initial acceptance 11 August 2006; final acceptance 30 September 2006; published online 1 November 2007; MS. number: 9023) The evolution of Biological Sciences, University of Edinburgh, West Mains Road, Edinburgh EH9 3JT, U.K. (email: m.burton@sms

  2. Patterns of DNA-Sequence Divergence Between Drosophila miranda and D. pseudoobscura

    E-print Network

    Keightley, Peter

    de Proce´ · Daniel L. Halligan · Peter D. Keightley · Brian Charlesworth Received: 3 February 2009 / Accepted: 7 October 2009 / Published online: 27 October 2009 Ó Springer Science+Business Media, LLC 2009 of Edinburgh, Edinburgh EH9 3JT, UK e-mail: s0677532@sms.ed.ac.uk; sophie_marion2000@hotmail.com 123 J Mol Evol

  3. 238 the plant genome november 2011 vol. 4, no. 3 original research

    E-print Network

    Lonardi, Stefano

    , NR4 7UH, UK; P.R. Bhat, J.T. Svensson, R.D. Fenton, and T.J. Close, Dep. of Botany and Plant Sciences of the Region Haná for Biotechnological and Agricultural Research, Institute of Experimental Botany, Sokolovská

  4. Statistical and Thermal Physics Second year physics course

    E-print Network

    Schekochihin, Alexander A.

    .274 × 10-24 JT-1 Avogadro's number NA 6.022 × 1023 mol-1 Standard molar volume 22.414 × 10-3 m3 mol-1 Molar that the number of microstates corresponding to a chain of N links of total length L is given by (L, N) = 2N! (N 2

  5. DETERMINATION OF BACK CONTACT BARRIER HEIGHT IN Cu(In,Ga)(Se,S)2 AND CdTe SOLAR CELLS

    E-print Network

    Sites, James R.

    DETERMINATION OF BACK CONTACT BARRIER HEIGHT IN Cu(In,Ga)(Se,S)2 AND CdTe SOLAR CELLS Galymzhan T-contact metallization. The input data is the current- voltage (J-V) curves for the solar cell measured over a range point technique and apply it to specific solar-cell examples. The range of Jt that can be practically

  6. 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

  7. Thermo-solutal modelling of microstructure formation during multiphase alloy solidification

    E-print Network

    Jimack, Peter

    Research/2 School of Computing, University of Leeds, LS2 9JT, U.K ap.c.bollada@leeds.ac.uk, ba.m.mullis@leeds.ac.uk, cp.k.jimack@leeds.ac.uk Keywords: solidification, phase field, dissipative systems, non concentration variable c = · D F c - j (2) and a temperature diffusion equation Cp T = · T + L . (3

  8. Bouquet and Join Theorems for Disentanglements Kevin Houston

    E-print Network

    Houston, Kevin

    , LS2 9JT, U.K. e-mail: khouston analytic map-germs f : (Cn, 0) ! (Cp, 0) with n p there exists a * *well established theory of Milnor fibres and K-equivalance. The A-equivalence theory* * of germs f : (Cn, 0) ! (Cp, 0) has been

  9. Clim. Past, 11, 403424, 2015 www.clim-past.net/11/403/2015/

    E-print Network

    Clim. Past, 11, 403­424, 2015 www.clim-past.net/11/403/2015/ doi:10.5194/cp-11-403-2015 © Author Building, University of Leeds, Leeds, LS2 9JT, UK 2British Geological Survey, Keyworth, Nottingham, UK 3

  10. The Magnetic Fusion Program in China ----Roadmap and Progress

    E-print Network

    energy problem now and future Burning plasma has been achieved on JET,TFTR, (JT-60) Some progress of MF Significant progress of MF research has been achieved since China join ITER project Roadmap of MFE development on the conceptual design and some R&D of CFETR has been achieved A special group for drafting the MF roadmap

  11. 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

  12. A "Careers in Medicine Seminar" for Secondary School Students

    ERIC Educational Resources Information Center

    Rodgers, Glen E.; And Others

    1976-01-01

    Describes a Thanksgiving weekend seminar for high school students sponsored for the last four years by Muskingum College. Information on careers and educational requirements were presented in lectures, panel and small group discussions, and direct informal contact with practicing professionals and medical educators. (JT)

  13. Arsenic sulphides: nucleation and growth from aqueous solution. Liane G. Benning

    E-print Network

    Benning, Liane G.

    1 Arsenic sulphides: nucleation and growth from aqueous solution. Liane G. Benning School of Earth Sciences, University of Leeds, Leeds, LS2 9JT, UK (liane@earth.leeds.ac.uk) Introduction. Arsenic, one-wide(1) . The arsenic cycle is controlled mainly by the precipitation of sparingly soluble AsIII and As

  14. 76 FR 30731 - Government-Owned Inventions; Availability for Licensing

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-05-26

    ..., JN Roberts, N Cuburu, JT Schiller, and CB Buck. Mucosal delivery of human papillomavirus pseudovirus... HUMAN SERVICES National Institutes of Health Government-Owned Inventions; Availability for Licensing... systemically. The first composition is typically a papillomavirus pseudovirion (PsV) comprising...

  15. Microchannel heat exchanger for two-phase Mixed Refrigerant Joule Thomson process

    NASA Astrophysics Data System (ADS)

    Baek, Seungwhan; Lee, Jisung; Lee, Cheonkyu; Jeong, Sangkwon

    2014-01-01

    Mixed Refrigerant Joule Thomson (MR-JT) refrigerators are widely used in various kinds of cryogenic systems these days. Printed Circuit Heat Exchanger (PCHE) is one of the promising cryogenic compact recuperators for MR-JT refrigerators due to its compactness, high NTU and robustness. However, PCHE composed with microchannel bundles can cause flow mal-distribution, and it can cause the degradation of thermal performance of the system. To mitigate the flow mal-distribution problem, the cross link (or intra-layer bypass) can be adapted to parallel microchannels. Two heat exchangers are fabricated in this study; one has straight channels, and the other one has intra-layer bypass structure between channels to enhance the flow distribution. The MR-JT refrigerators are operated with these two heat exchanger and the no-load temperatures are compared. The lower no load temperature achieved with the intra-layer bypass structured heat exchanger. The results indicate that the flow mal-distribution in the microchannel heat exchanger can be mitigated with intra-layer bypass structure, and relaxation of flow mal-distribution in the heat exchanger guarantee the MR-JT refrigerator's performance.

  16. Disruption Neutral Point: Is it relevant for C-Mod ?

    E-print Network

    Disruption Neutral Point: · Is it relevant for C-Mod ? · Is it relevant for FIRE ? R. Granetz FIRE of the `neutral point' concept R. Granetz FIRE Physics Workshop 2000 Page 2 #12;Disruption mitigation research on JT-60U includes studies of the `neutral point' concept R. Granetz FIRE Physics Workshop 2000 Page 3

  17. 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 by Oxford University Press on behalf of the Society for Molecular Biology and Evolution. All rights reserved of the genus Symbiodinium form an endosymbiosis with reef building corals, in which photosynthetically

  18. 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)

  19. A comparison of microseismicity induced by gel-proppant-and water-injected hydraulic fractures, Carthage Cotton Valley gas field, East Texas

    E-print Network

    , Carthage Cotton Valley gas field, East Texas J.T. Rutledge* and W.S. Phillips, Los Alamos National induced during a series of hydraulic fracture completions within the Cotton Valley formation of East Texas- proppant treatments in Cotton Valley reservoirs, but at greatly reduced cost (Mayerhofer and Meehan, 1998

  20. USE OF HIDDEN MARKOV MODELS TO ASSESS PREDICTABILITY ON ANNUAL TO DECADAL TIME SCALES

    E-print Network

    Katz, Richard

    . regime shift -- Hidden Markov model Mixture of distributions (hidden states) Markov chain (persistence functions glm & lm · Daily Precipitation Occurrence -- Markov chain model (two-state, first-order) Jt = 1's -- Ht finite-state, first-order Markov chain (two or more states) -- Hidden Markov dependence for Ht can

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

    SciTech Connect

    Shimazaki, T.

    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.

  2. The Occurrence of Lysogenic Bacteria and Microbial Aggregates in the Lakes of the McMurdo Dry Valleys, Antarctica

    E-print Network

    Priscu, John C.

    Valleys, Antarctica J.T. Lisle1 and J.C. Priscu2 (1) USGS, Center for Coastal and Watershed Research, St: 25 March 2004 Abstract The McMurdo Dry Valleys of Antarctica form the coldest and driest ecosystem. Introduction The McMurdo Dry Valleys of Antarctica (160 ­164 E, 76 20¢­78 20¢S) form one of the most extreme

  3. DEVELOPMENT OF SPONGES FROM TISSUE CELLS OUTSIDE THE BODY OF THE PARENT

    E-print Network

    DEVELOPMENT OF SPONGES FROM TISSUE CELLS OUTSIDE THE BODY OF THE PARENT .;J. By H. V. Wilson;DEVELOPMENT OF SPONGES FROM TISSUE CELLS OUTSIDE THE BODY OF THE PARENT. .Jt. By H. V. WILSON, Professor that an investi- gation to cover the various ways in which sponges reproduce might yield some results of value

  4. 78 FR 49768 - Notice Pursuant to the National Cooperative Research and Production Act of 1993-Joint Task-Force...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-08-15

    ... Task-Force Networked Media Notice is hereby given that, on July 10, 2013, pursuant to Section 6(a) of...''), Joint Task-Force Networked Media (``JT-NM'') has filed written notifications simultaneously with the..., CANADA; Skotel Corporation, Brossard, Quebec, CANADA; Society of Motion Pictures and Television...

  5. BioMed Central Page 1 of 20

    E-print Network

    Benning, Liane G.

    AccessResearch article Greigite: a true intermediate on the polysulfide pathway to pyrite Stefan Hunger of Leeds, Leeds, LS2 9JT, UK Email: Stefan Hunger* - s.hunger@earth.leeds.ac.uk; Liane G Benning - l from: http://www.geochemicaltransactions.com/content/8/1/1 © 2007 Hunger and Benning; licensee Bio

  6. restricts or otherwise skews the Wnt transcriptome (Figure 1). If it is the inter-

    E-print Network

    Ungermann, Christian

    are established and how niches of surviving cancer stem cells are created in tumors. REFERENCES Azzolin, L., Ali, L.D., Lizotte, P.H., Wong, T.C., et al. (2011). Proc. Natl. Acad. Sci. USA 108, 12372. Acad. Sci. USA 102, 18034­18039. Rosenbluh, J., Nijhawan, D., Cox, A.G., Li, X., Neal, J.T., Schafer, E

  7. *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- ment lagoons (primary, secondary, and tertiary) using the dynamic chamber system. Measurements occurred during the fall of 1998 through the early spring of 1999, and each lagoon was examined for approximately

  8. 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)

  9. The Wellcome Trust Review 1999 A selection of research projects and major initiatives 1

    E-print Network

    Rambaut, Andrew

    century. JT\\ 3 The Director Changing times Michael Dexter SCIENCE FUNDING / Viral paralysis O Japanese The full Campy: The genome sequence of a food-borne pathogen Julian Forkful/, Ban Barrell, Julian Ketley and Brendan Wren 'AI* 40 Chi I \\J Hap Child development Happy families?: Non-traditional families and hildren

  10. Relationships of physical job tasks and living conditions with occupational injuries in coal miners.

    PubMed

    Bhattacherjee, Ashis; Bertrand, Jean-Pierre; Meyer, Jean-Pierre; Benamghar, Lahoucine; Otero Sierra, Carmen; Michaely, Jean-Pierre; Ghosh, Apurna Kumar; d'Houtaud, Alphonse; Mur, Jean-Marie; Chau, Nearkasen

    2007-04-01

    This study assessed the relationships of job tasks and living conditions with occupational injuries among coal miners. The sample included randomly selected 516 underground workers. They completed a standardized self-administred questionnaire. The data were analyzed via logistic regression method. The rate of injuries in the past two years was 29.8%. The job tasks with significant crude relative risks were: power hammer, vibrating hand tools, pneumatic tools, bent trunk, awkward work posture, heat, standing about and walking, job tasks for trunk and upper/lower limbs, pain caused by work, and muscular tiredness. Logistic model shows a strong relationship between the number of job tasks (JT) and injuries (adjusted ORs vs. JT 0-1: 2.21, 95%CI 1.27-3.86 for JT 2-6 and 3.82, 2.14-6.82 for JT>or=7), and significant ORs>or=1.71 for face work, not-good-health-status, and psychotropic drug use. Musculoskeletal disorders and certain personality traits were also significant in univariate analysis. Therefore job tasks and living conditions strongly increase the injuries, and occupational physicians could help workers to find remedial measures. PMID:17485883

  11. Columbia University Today: Why the Peanut Butter Revolution Didn't Spread

    ERIC Educational Resources Information Center

    Larned, Deborah

    1975-01-01

    A 1970 graduate of Columbia, who was involved in the 1968 student protests, returns to assess the mood of students and the Columbia Corporation (the University as a legal entity) and concludes that students are less militant, possibly because of admissions policies, but that the Columbia Corporation has not changed. (JT)

  12. The linkages between photosynthesis, productivity, growth and biomass in lowland Amazonian forests

    E-print Network

    Malhi, Yadvinder

    JT, UK, 13 Instituto Nacional de Pesquisas da Amaz^onia (INPA), Coordenacß~ao de Din^amica Ambiental Instituto de Pesquisa Ambiental da Amaz^onia (IPAM), Rua Horizontina, 104, Centro, 78640-000 Canarana, Mato of Physical Geography and Ecosystem Science, Lund University, Solvegatan 12, Lund, 223 62, Sweden, 3 Instituto

  13. Biogeosciences, 8, 10811106, 2011 www.biogeosciences.net/8/1081/2011/

    E-print Network

    Chave, Jérôme

    of Leeds, Leeds, LS2 9JT, UK 2Instituto Nacional de Pesquisas da Amazonia (INPA), Manaus, Brazil 3Forestry Nacional de Colombia sede Amazonia, Km 2 v´ia Tarapac´a, Leticia, Amazonas, Colombia 27Bureau Waardenburg. and Research Centre, 6700 AA, Wageningen, The Netherlands 5Programa de Manejo de Bosques de la Amazonia

  14. 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

  15. Applicability of the Joule-Thomson Cryocooler Coupled with Membrane-Based Purification System for Liquefaction of Natural Gas in Small Quantities

    NASA Astrophysics Data System (ADS)

    Piotrowska, A.; Chorowski, M.

    2008-03-01

    Joule-Thomson (J-T) cryocoolers using gas mixture have been studied theoretically and experimentally for a variety of applications. Gas separation technology using polymer membrane is emerging. In this paper the concept of coupling the J-T cooler with a hollow fiber membranes is presented. The apparatus can be used in many applications, like compressed natural gas (CNG) purification and condensation into LNG or separation and liquefaction of nitrogen from air. The paper describes the system and experimental dependence of the separated nitrogen purity on the membrane inlet air pressure. The Second Law of Thermodynamics is used to optimize the composition of the mixture for natural gas cooling and liquefaction. Possible applications of the system depend on membrane material. Membranes used in separation of N2/air or CO2/CH4 are now commercially available [2,6]. The combination of the J-T cooler with N2/air membrane enables the construction of the liquid nitrogen production system aimed at cryosurgical applications. Similarly, J-T cooler coupled with CO2/CH4 membrane can be used for purification and liquefaction of natural gas in small quantities e.g. satisfying future car refueling system needs.

  16. Virtual Histology of Transgenic Mouse Embryos for High-Throughput Phenotyping

    E-print Network

    Capecchi, Mario R.

    Virtual Histology of Transgenic Mouse Embryos for High-Throughput Phenotyping John T. Johnson1-resolution virtual histology for phenotypic assessment of mouse embryos. Using osmium tetroxide to differentially embryotoxicity. Citation: Johnson JT, Hansen MS, Wu I, Healy LJ, Johnson CR, et al. (2006) Virtual histology

  17. Genet. Res., Camb. (1997), 70, pp. 125133 With 4 figures. Printed in the United Kingdom # 1997 Cambridge University Press 125 Mapping quantitative trait loci for body weight on the X

    E-print Network

    Keightley, Peter

    1997-01-01

    "* "Institute of Cell, Animal and Population Biology, Uni ersity of Edinburgh, West Mains Road, Edinburgh EH9 3JT, Scotland, UK #Department of Statistics, Uni ersity of Washington, Seattle, Washington, USA (Recei weight by approximately 18% at 10 weeks. A strategy to positionally clone the QTL is discussed. 1

  18. Academic Freedom in South Africa: The Open Universities in South Africa and Academic Freedom, 1957-1974

    ERIC Educational Resources Information Center

    Minerva, 1975

    1975-01-01

    When the South African government initiated a racial separation policy in universities in 1957 the Universities of Cape Town and Witwatersrand, Johannesburg, declared their opposition and continue after 17 years to pursue their efforts for racial equality. This report assesses the effects on university structure and academic freedom. (JT)

  19. 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)

  20. Population dynamic consequences of parasitised-larval competition in stage-structured hostparasitoid systems

    E-print Network

    Rohani, Pej

    from the timing at which a parasitoid attacks, leading to important age-dependent effects of parasitism 9JT. Á P. Rohani, Inst. of Ecology, Univ. of Georgia, Athens, GA 30602, USA. Parasitism can that intra-class competition between parasitised and unparasitised hosts have on the hostÁ parasite

  1. WHEN GIANTS DREAMED ABOUT THE FLOOD THE BOOK OF GIANTS AND ITS RELATIONSHIP TO

    E-print Network

    McQuade, D. Tyler

    Enoch and the Book of Giants still persists, as is evident in the official title of the Giants in the books that comprise 1 Enoch, the Book of Giants is given much less attention, although its offi- cial of these texts were available ear- lier in J.T. MILIK, The Books of Enoch: Aramaic Fragments of Qumrân Cave 4

  2. Earth and Planetary Science Letters 397 (2014) 93100 Contents lists available at ScienceDirect

    E-print Network

    Polz, Martin

    2014-01-01

    and microbial growth on sand bars initiate and shape elongated stromatolite mounds G. Mariotti , J.T. Perron, T reconstructions. However, mechanisms that create shore-parallel, m-scale elongated stromatolite mounds sediments. This model of elongated stromatolite mounds can inform paleoenvironmental reconstructions

  3. Pricing and hedging of the currency multiple option on the maximum of several bonds

    E-print Network

    Vargiolu, Tiziano

    Pricing and hedging of the currency multiple option on the maximum In this paper we present a closed formula for the price and for the replicating* * strategy of the currency T , converted in domestic currency via the exchange* * rate X1j(t) at time t, that is Sj

  4. Pseudorotation in fullerene anions

    NASA Astrophysics Data System (ADS)

    Dunn, Janette L.; Hands, Ian D.; Bates, Colin A.

    2007-07-01

    Jahn-Teller (JT) problems are often characterised by an adiabatic potential energy surface (APES) containing either a set of isoenergetic wells or a trough of equivalent-energy points, which may be warped by higher-order coupling terms or anisotropic effects. In all three cases, the JT effect will be dynamic. Either tunnelling between the wells or rotation (of a distortion) around the trough will restore the original symmetry of the system. This motion is referred to as pseudorotation. It should be possible to observe a JT system in a distorted geometry if measurements are made on a sufficiently short timescale. In various cubic systems, this timescale has been calculated to be the order of picoseconds. Such timescales are accessible using modern methods of ultrafast spectroscopy. Measurements of pseudorotation rates can lead to important information on the strength and nature of the JT coupling present. We will present analytical calculations that allow the rate of pseudorotation to be determined in terms of the vibronic coupling parameters. We will show how these results can be applied to E ? e systems and then to the more complicated system applicable to C60- anions. This is of particular interest because of the high icosahedral symmetry of fullerene ions and also because of the many potential uses of materials containing these ions. We conclude by outlining experiments that should be capable of measuring pseudorotation in C 60 anions.

  5. J Mol Evol (1991) 33:442-449 MolecularEvolution

    E-print Network

    Eyre-Walker, Adam

    1991-01-01

    . The test was applied to 62 mammalian sequences, and significant codon usage biases were detected in all An Analysis of Codon Usage in Mammals: Selection or Mutation Bias? Adam C. Eyre-Walker Institute of Cell, Animal and Population Biology, University of Edinburgh, West Mains Road, Edinburgh EH9 3JT, United

  6. Statistical and Thermal Physics Second year physics course

    E-print Network

    Schekochihin, Alexander A.

    .6726 × 10-27 kg Bohr magneton µB 9.274 × 10-24 JT-1 Avogadro's number NA 6.022 × 1023 mol-1 Standard molar that the critical point is specified by Tc = a/4Rb; Vc = 2b; pc = a/4e2 b2 . (b) Show that equation (1) obeys a law

  7. Transmission consequences of coinfection: cytokines writ large?

    E-print Network

    , Edinburgh EH9 3JT, UK 2 Division of Animal Production and Public Health, Faculty of Veterinary Medicine of coinfection have recently been reviewed [14,15] and debated [16­18] in Trends in Parasitology, and detailed innate and adaptive responses to infection [24]. Cytokines Review TRENDS in Parasitology Vol.23

  8. 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...

  9. 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

  10. 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)

  11. Personal Liability of Trustees of Educational Institutions

    ERIC Educational Resources Information Center

    Porth, William C.

    1974-01-01

    Examines trustee liability in light of the Stern v. Sibley Memorial Hospital decision which contains "a thorough and well considered exposition on the liability of trustees of charitable corporations as well as useful guidelines to be followed, particularly in the area of conflicts of interests." (JT)

  12. S F BOYS -A RAHMAN LECTURE Chaos, Lyapunov Exponents and Transport

    E-print Network

    Evans, Denis

    YEAR 2000 S F BOYS - A RAHMAN LECTURE Chaos, Lyapunov Exponents and Transport Coefficients by Denis of Thermodynamics and chaotic measures. Boys-Rahman Lecture 2 #12;Heat Q, is removed by the thermostat to ensure dependent nonequilibrium distribution J(t) ] ] Boys-Rahman Lecture 3 #12;Liouville Equation for N

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

    E-print Network

    PREPARED FOR THE U.S. DEPARTMENT OF ENERGY, UNDER CONTRACT DE-AC02-76CH03073 PRINCETON PLASMA on the U.S. Department of Energy's Princeton Plasma Physics Laboratory Publications and Reports web site 1), M. Kuriyama 2), M. Kawai 2), T. Itoh 2), N. Umeda 2), JT-60U Team 2) 1) Princeton Plasma Physics

  14. , 20130530, published 2 October 201392013Biol. Lett. Toms Albrecht and Jan T. Lifjeld

    E-print Network

    Mousseau, Timothy A.

    -off between sperm length and integrity Patterns of sperm damage in Chernobyl passerine birds Supplementary JT. 2013 Patterns of sperm damage in Chernobyl passerine birds suggest a trade-off between sperm://rsbl.royalsocietypublishing.org. Evolutionary biology Patterns of sperm damage in Chernobyl passerine birds suggest a trade-off between sperm

  15. NITRATE MOVEMENT IN SOUTHEASTERN COASTAL PLAIN SOILS UNDER CONSERVATION-TILLED VEGETABLE PRODUCTION

    E-print Network

    Decoteau, Dennis R.

    t o increase water retention, organic matter, etc. and reduce evaporation, soil erosion, etc. (GilliamNITRATE MOVEMENT IN SOUTHEASTERN COASTAL PLAIN SOILS UNDER CONSERVATION-TILLED VEGETABLE PRODUCTION G.D. Hoyt1 , D.C. Sanders2 , J.T. D.R. Decoteau3 , ABSTRACT Movement of soil nitrates by leaching

  16. Fi hery uf e , 0 . 35 '----------~.;...;;....;;.."___D_. _C._

    E-print Network

    r esnwater they feed on microscopic, floating animals, such as water-fleas, just as they do in the stones by fanning with their tails . The eggs are deposited in the depressions and buried with gravel . A female KaJT1~oops trout pr oduces about 800 to 1 000 'eggs per pound of fish. A ten- poun l\\amloops may

  17. NATURAL BIODEGRADATION OF NTBE ON A SITE ON LONG ISLAND, NY: SYMPOSIUM

    EPA Science Inventory

    NRMRL-ADA-00170 Kolhatkar, R., Wilson*, J.T., and Hinshalwood, G. "Natural Biodegradation of NTBE on a Site on Long Island, NY." In: 6th Intl. In-Situ and On-Site Symposium on Bioremediation of MTBE, Alcohols, and Ethers, Battelle, The Si...

  18. ?-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.

  19. doi: 10.1098/rsfs.2012.0018 , 393-396 first published online 4 April 201222012Interface Focus

    E-print Network

    Maini, Philip K.

    . Barry Cooper and Philip K. Maini The mathematics of nature at the Alan Turing centenary References http;INTRODUCTION The mathematics of nature at the Alan Turing centenary S. Barry Cooper* and Philip K. Maini School of Mathematics, University of Leeds, Leeds LS2 9JT, UK Keywords: Alan Turing; morphogenesis Alan Turing inhabited

  20. John Brademas: Education's White Knight on Capitol Hill

    ERIC Educational Resources Information Center

    Sawislak, Arnold B.

    1975-01-01

    Reviews the work of John Brademas, chairman of the House Subcommittee on Select Education, with jurisdiction ranging from child care to federal role in cultural activities, and second ranking member of the Subcommittee on Postsecondary Education. Notes his role in past legislation and his views on present issues. (JT)

  1. A Couples Group of Medical Students

    ERIC Educational Resources Information Center

    Porter, Kenneth; And Others

    1976-01-01

    An experiment at the Albert Einstein College of Medicine with a short-term medical student couples' workshop designed to foster increased sensitivity between medical students and their partners resulted in recommendation that such workshops be offered to medical students. (JT)

  2. Does liquid crystal pre-patterning govern microtubule arrangement in mitosis?

    E-print Network

    Miroshnychenko, Dmitri

    1 Does liquid crystal pre-patterning govern microtubule arrangement in mitosis? Dmitri of Leeds, Leeds LS2 9JT, UK. A description of one of the most important events in cell biology ­ mitosis1 geometry of the process is determined. Here we propose a model of the cell geometry during mitosis and show

  3. Junctional Tourniquet Training Experience.

    PubMed

    Kragh, John F; Geracci, James J; Parsons, Donald L; Robinson, John B; Biever, Kimberlie A; Rein, Erling B; Glassberg, Elon; Strandenes, Geir; Chen, Jacob; Benov, Avi; Marcozzi, David; Shackelford, Stacy; Cox, Kevin M; Mann-Salinas, Elizabeth A

    2015-01-01

    Since 2009, out-of-hospital care of junctional hemorrhage bleeding from the trunk-appendage junctions has changed, in part, due to the newly available junctional tourniquets (JTs) that have been cleared by the US Food and Drug Administration. Given four new models of JT available in 2014, several military services have begun to acquire, train, or even use such JTs in care. The ability of users to be trained in JT use has been observed by multiple instructors. The experience of such instructors has been broad as a group, but their experience as individuals has been neither long nor deep. A gathering into one source of the collective experience of trainers of JT users could permit a collation of useful information to include lessons learned, tips in skill performance, identification of pitfalls of use to avoid, and strategies to optimize user learning. The purpose of the present review is to record the experiences of several medical personnel in their JT training of users to provide a guide for future trainers. PMID:26360350

  4. 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)

  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. Microelectromechanical spatial light modulators with integrated electronics

    E-print Network

    Bifano, Thomas

    Microelectromechanical spatial light modulators with integrated electronics Steven Cornelissen1) electronics, for control of optical phase in phase-only optical correlators. The jtSLM will consist of a large-of-concept study are presented along with an electromechanical model and details of the fabrication process

  7. Mar Biol (2008) 154:10311040 DOI 10.1007/s00227-008-0994-z

    E-print Network

    Aberdeen, University of

    2008-01-01

    Mar Biol (2008) 154:1031­1040 DOI 10.1007/s00227-008-0994-z 123 ORIGINAL PAPER Flexible incubation, University of Aberdeen, Lighthouse Field Station, Cromarty, Ross-shire IV11 8YJ, UK S. Lewis School of Biological Sciences, University of Edinburgh, West Mains Road, Edinburgh EH9 3JT, UK #12;1032 Mar Biol (2008

  8. GenePool Information Sheet #5 v2 The Gene Pool (The University of Edinburgh Sequencing Facility)

    E-print Network

    Facility) Ashworth Laboratories, King's Buildings, Edinburgh, Scotland EH9 3JT, UK phone 0131 6513633. Because the next generation technologies do not include a step that involves cloning in bacterial vectors-insert plasmid library and end sequencing a low coverage of clones to identify those that span expected gaps

  9. GenePool Information Sheet #7 v2 The Gene Pool (The University of Edinburgh Sequencing Facility)

    E-print Network

    Facility) Ashworth Laboratories, King's Buildings, Edinburgh, Scotland EH9 3JT, UK phone 0131 6513633 Genome resequencing YES YES YES De novo Transcriptome sequencing YES (from clones) YES YES YES Global, phylogenetics and DNA barcoding from communities YES YES YES End-sequencing of large-insert clones. YES Genome

  10. GenePool Information Sheet #2 v2 The Gene Pool (The University of Edinburgh Sequencing Facility)

    E-print Network

    Facility) Ashworth Laboratories, King's Buildings, Edinburgh, Scotland EH9 3JT, UK phone 0131 6513633 are supplied in 96-well plates. We also sequence from recombinant bacterial clones, where you supply will shotgun subclone from your large-insert bacterial clone (fosmid or BAC) and sequence to a specified

  11. Singlet Ground State of the Quantum Antiferromagnet Ba3CuSb2O9 J. A. Quilliam,1

    E-print Network

    Paris-Sud 11, Université de

    that there is a total absence of spin freezing in the ground state. Sb NMR measurements allow us to track the intrinsicSinglet Ground State of the Quantum Antiferromagnet Ba3CuSb2O9 J. A. Quilliam,1 F. Bert,1 E are ex- pected to have QSL ground states and apparent JT insta- bilities make it even more surprising

  12. Medical Treatment and Human Experimentation: Introducing Illegality, Fraud, Duress and Incapacity to the Doctrine of Informed Consent

    ERIC Educational Resources Information Center

    Foster, Constance B.

    1975-01-01

    The court held in Kaimowitz v. Department of Mental Health that "involuntarily detained mental patients cannot give informed and adequate consent to experimental psychosurgical procedures on the brain." This note argues that the present theory of informed consent is inadequate for such cases and proposes a new theory. (JT)

  13. Geophysical Journal International Geophys. J. Int. (2012) doi: 10.1093/gji/ggs063

    E-print Network

    Müller, Dietmar

    2012-01-01

    and K. H. Singh3 1School of Earth & Environment, University of Leeds, Leeds LS2 9JT, UK. E-mail: sheona.masterton@getech.com 2School of Geosciences, University of Sydney, NSW, Australia 3Department of Earth Sciences, Indian of oceanic crust and lithosphere is fairly uniform, and a uniform layer magnetized by a magnetic field

  14. Linear line polarimetry modelling of pre-main sequence Jorick S. Vink 1 , Janet E. Drew 1 , Tim J. Harries 2 , Rene D. Oudmaijer 3

    E-print Network

    Vink, Jorick

    Road, London SW7 2AZ, UK 2 University of Exeter, School of Physics, Stocker Road, Exeter EX4 4QL, UK 3 University of Leeds, School of Physics & Astronomy, EC Stoner Building, Leeds LS2 9JT, UK Abstract. We that emits line photons uniformly, as well as via hot spots. Intriguingly, the switch between a uniform point

  15. The Back Pay Remedy in Title VII Class Actions: Problems of Procedure

    ERIC Educational Resources Information Center

    Edwards, Charles A.

    1974-01-01

    The class action for back pay has developed as a significant factor in employment discrimination litigation under Title VII of the Civil Rights Act of 1964. Problems of demonstrating each class member's entitlement are examined and a bifurcated trial procedure is proposed as a method for handling such cases. (JT)

  16. 77 FR 2271 - Technical Advisory Committees; Notice of Recruitment of Private-Sector Members

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-01-17

    ... send a copy of your resume to Ms. Yvette Springer at Yvette.Springer@bis.doc.gov . Deadline: This... FURTHER INFORMATION CONTACT: Ms. Yvette Springer on (202) 482-2813. Dated: January 11, 2012. Yvette Springer, Committee Liaison Officer. BILLING CODE 3510-JT-P...

  17. 76 FR 72160 - Regulations and Procedures Technical Advisory Committee; Notice of Open Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-11-22

    ..., first serve basis. To join the conference, submit inquiries to Ms. Yvette Springer at Yvette.Springer... the meeting to Ms. Springer via email. For more information, call Yvette Springer at (202) 482-2813. Dated: November 16, 2011 Yvette Springer, Committee Liaison Officer. BILLING CODE 3510-JT-P...

  18. 78 FR 5774 - Technical Advisory Committees; Notice of Recruitment of Private-Sector Members

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-01-28

    ... send a copy of your resume to Ms. Yvette Springer at Yvette.Springer@bis.doc.gov . Deadline: This... FURTHER INFORMATION CONTACT: Ms. Yvette Springer on (202) 482-2813. Dated: January 22, 2013. Yvette Springer, Committee Liaison Officer. BILLING CODE 3510-JT-P...

  19. TANG ET AL. VOL. XXX ' NO. XX ' 000000 ' XXXX www.acsnano.org

    E-print Network

    Wang, Zhong L.

    -0245, United States. ^ W.T. and J.T. contributed equally to this work. B one remodeling or orthodontic treat for clinical therapy of bone remodeling and orthodontic treatment. RESULTS AND DISCUSSION The SPLC system, 2015. Published online 10.1021/acsnano.5b03567 ABSTRACT Bone remodeling or orthodontic treatment

  20. 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

  1. Detection of specific HPV subtypes responsible for the pathogenesis of condylomata acuminata

    E-print Network

    Hawkins, Matthew G.; Winder, David M.; Ball, Siolian L. R.; Vaughan, Katie; Sonnex, Christopher; Stanley, Margaret A.; Sterling, Jane C.; Goon, Peter K. C.

    2013-05-01

    , Vaughan K, Hanna N, Woo YL, Franzer JT, Sterling JC, Stanley MA, Sudhoff H, Goon PK: Sensitive HPV detection in oropharyngeal cancers. BMC Cancer 2009, 9:440.Submit your next manuscript to BioMed Central and take full advantage of: • Convenient online...

  2. Plasma Phys. Control. Fusion 38 (1996) 17911804. Printed in the UK p-collapse-induced vertical displacement event in high p

    E-print Network

    1996-01-01

    Research Establishment, Japan Atomic Energy Research Institute, Naka-machi, Naka-gun, Ibaraki 311-01, Japan in machines with non-circular plasma cross sections like JET [5], DIII-D [6], ASDEX Upgrade [7] and JT-60U [4 understanding of VDE mechanisms and the development of techniques for softening these unfavourable events. VDE

  3. The Role of the Humanities in the African University Tomorrow

    ERIC Educational Resources Information Center

    Diarrassouba

    1974-01-01

    After reviewing the historical and potential place of the humanities in African education, the author advocates an educational model in which the humanities would be limited in the vertical plane (i.e. over-specialization discouraged) but expanded horizontally into other university departments. [Article is in both English and French.] (JT)

  4. Galaxy transformation in action! The spiral galaxy WKK 6176

    E-print Network

    Kraan-Korteweg, Renée C.

    .J.: A&A 413, 37 (2004) 2. Buta R., McCall M.: ApJS 124, 33 (1999) 3. Cortese L., Marcillac D, Richard J. et al.: MNRAS 367, 157 (2007) 4. de Grijs R., Lee J.T., Mora Herrera M. et al.: NewA 8, 155 (2003) 5

  5. Production of Artificial Lightning in An Ordinary Clear Light Bulb.

    ERIC Educational Resources Information Center

    Zaffo, Peter Alfred

    1981-01-01

    Reported is a method of producing artificial lightning in an ordinary clear lightbulb. The appearance of sparks produced is that of a miniature stroke of forked lightning seen in natural thunderstorms. The sparks also show the intricate branching patterns often seen in natural lightning. (JT)

  6. Anim. Behav., 1997, 54, 437450 A comparative study of virginity in fig wasps

    E-print Network

    West, Stuart

    . HERRE, S. G. COMPTON, H. C. J. GODFRAY* & J. M. COOK* *Department of Biology and NERC Centre animals, males develop from unfertilized eggs and females from fertilized eggs. Consequently, unmated Mains Road, Edinburgh EH9 3JT, U.K. (email: stu.west@ed.ac.uk). H. C. J. Godfray and J. M. Cook

  7. Symmetrized local co-registration optimization for anomalous change detection

    E-print Network

    Wohlberg, Brendt

    of anomalous change. Our approach for misregistration compensation can be applied to any of these pixel: {brendt,jt}@lanl.gov #12;1.1. Hyperbolic anomalous change detection Let x Rdx be a pixel vSymmetrized local co-registration optimization for anomalous change detection Brendt Wohlberg

  8. Copyright 2013 IEEE. To appear in the 1st IEEE Global Conference on Signal and Information Processing. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional

    E-print Network

    Theiler, James

    into pixel-wise anomalous change detection algorithms. But if this is done in the most straightfor- ward way-Spectral Anomalous Change Detection in Hyperspectral Imagery James Theiler Los Alamos National Laboratory Los Alamos, NM, USA 87545 jt@lanl.gov Abstract--Because each pixel of a hyperspectral image con- tains so much

  9. Actuator and Kinematic Redundancy in Biological Motor Control*

    E-print Network

    Shadmehr, Reza

    a learning mechanism produces a virtual equilibrium trajectory that compensates for the second order dynamics), for a given joint torque trajectory T(t), a trajectory in terms of muscle forces ¢J(t) cannot be calculated joint torque. A simple example of this is evident in post~ral ~ont~ol: o~e.Cil.Il hold a limh

  10. The Accuracy of Recording Patient Problems in Family Practice

    ERIC Educational Resources Information Center

    Bentsen, Bent Gutterm

    1976-01-01

    Reports studies of the validity of medical data recorded and computerized at University of Western Ontario family medical centers. In the 59 encounters observed residents recorded an average of 1.51 problems and observers 2.45. Implications for medical education, audit, research, computer systems, and quality of care are discussed. (JT)

  11. Exploiting petri-net structure for activity classification and user instruction within an industrial setting

    E-print Network

    Leeds, University of

    and augmented reality instruction, enabling ambient multi-modal interaction between system and user an industrial setting S. F. Worgan School of Computing University of Leeds Leeds, LS2 9JT S.Worgan@leeds.ac.uk A interaction in industrial settings faces a number of challenges. A formal workflow may be unknown or implicit

  12. Charge localization and JahnTeller distortions in the benzene dimer cation Piotr A. Pieniazek, Stephen E. Bradforth,a

    E-print Network

    Krylov, Anna I.

    Charge localization and Jahn­Teller distortions in the benzene dimer cation Piotr A. Pieniazek August 2008 Jahn­Teller JT distortions and charge localization in the benzene dimer cation are analyzed.1063/1.2969107 I. INTRODUCTION The benzene dimer cation is an important model system for radiation

  13. 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 resolution. A queen­worker conflict over sex allocation is expected because workers are more related

  14. * Corresponding author. Tel.:#82-42-869-3441; fax: #82-42-869-E-mail address: jtlim@stcon.kaist.ac.kr (J. -T. Lim).

    E-print Network

    Lim, Jong-Tae

    levitation systems S.-H. Lee, H.-K. Sung, J.-T. Lim*, Z. Bien Department of Electrical Engineering, Korea of electromagnetic levitation systems deteriorate. Thus, this paper proposes a self-tuning controller for electromagnetic levitation systems with unknown mass variations. The self-tuning controller is an extended version

  15. On the thermal gradient in the Earth's deep interior

    NASA Astrophysics Data System (ADS)

    Tirone, M.

    2015-09-01

    Temperature variations in large portions of the mantle are mainly controlled by the reversible and irreversible transformation of mechanical energy related to pressure and viscous forces into internal energy along with diffusion of heat and chemical reactions. The simplest approach to determine the temperature gradient is to assume that the dynamic process involved is adiabatic and reversible, which means that entropy remains constant in the system. However heat conduction and viscous dissipation during dynamic processes effectively create entropy. The adiabatic and non-adiabatic temperature variation under the influence of a constant or varying gravitational field are discussed in this study from the perspective of the Joule-Thomson (JT) throttling system in relation to the transport equation for change of entropy. The JT model describes a dynamic irreversible process in which entropy in the system increases but enthalpy remains constant (at least in an equipotential gravitational field). A comparison is made between the thermal gradient from the JT model and the thermal gradient from two models, a mantle convection and a plume geodynamic model coupled with thermodynamics including a complete description of the entropy variation. The results show that the difference is relatively small and suggests that thermal structure of the asthenospheric mantle can be well approximated by an isenthalpic model when the formulation includes the effect of the gravitational field. For non-dynamic or parameterized mantle dynamic studies the JT formulation provides a better description of the thermal gradient than the classic isentropic formulation.

  16. 2008JINST3S08003 PUBLISHED BY INSTITUTE OF PHYSICS PUBLISHING AND SISSA

    E-print Network

    . Alessandria,87 C. Alexa,24 G. Alexander,150 T. Alexopoulos,9 G. Alimonti,87 M. Aliyev,10 P.P. Allport,70 S,135 K. Bachas,151 G. Bachy,28 E. Badescu,24 P. Bagnaia,132 D.C. Bailey,154 J.T. Baines,127 O.K. Baker

  17. Refereed Publications/Journals Cassidy, T.A., C.P. Paranicas, J.H. Shirley, J.B. Dalton, B.T. Teolis, R.E. Johnson,

    E-print Network

    Johnson, Robert E.

    .T. Teolis, R.E. Johnson, L. Kamp, A.R. Hendrix, "Magnetospheric ion sputtering and water ice grain size-PLANET AND EXOPLANETS: CRITERION FOR TRANSONIC FLOW", Astrophys J. Lett. 768:L4 (6pp), 2013. Johnson, R.E., A.N. Volkov and J.T. Erwin, "ERRATUM: MOLECULAR-KINETIC SIMULATIONS OF ESCAPE FROM THE EX-PLANET AND EXOPLANETS

  18. Pure Mathematics in Australia

    ERIC Educational Resources Information Center

    Bloom, W. R.; And Others

    1975-01-01

    Reports a survey concerned with the future of mathematics in Australia which identified the number of "experts" in particular areas of mathematics who are working in Australia. Findings show increased research work in the past five years but conclusions indicate that many mathematical areas continue to be neglected. (JT)

  19. 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)

  20. 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)

  1. Exergy Analysis of Incremental Sheet Forming M.A. Dittrich1

    E-print Network

    Gutowski, Timothy

    Exergy Analysis of Incremental Sheet Forming M.A. Dittrich1 , T.G. Gutowski1 , J. Cao2 , J.T. Roth3 studied so far. Using the concept of exergy analysis, two ISF technologies, namely single sided and double. A second exergy analysis is carried out with the purpose of examining the environmental impact of different

  2. SOURCE SAMPLING FINE PARTICULATE MATTER: WOOD-FIRED INDUSTRIAL BOILER: PROJECT REPORT/SUMMARY

    EPA Science Inventory

    NRMRL-RTP-229 Dayton, D.P., and Bursey, J.T. Source Sampling Fine Particulate Matter: Wood-fired Industrial Boiler. EPA-600/R- 01/106, Available: NTIS.10/29/2001 The report provides a profile for a wood-fired industrial boiler equipped with a multistage electrostatic precipitato...

  3. 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

  4. 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)

  5. Student Attrition in North American Veterinary Schools

    ERIC Educational Resources Information Center

    Hooper, Billy E.; Brown, Roger E.

    1975-01-01

    Data presented shows a progressive reduction in North American veterinary student attrition from 12.8 percent in 1966 to 3.1 percent in 1974. The prediction is that with improved selection procedures and time-variable instructional programs the rate will drop and stabilize at approximately two percent. (JT)

  6. DTP | Toxicology and Pharmacology Branch (TPB)

    Cancer.gov

    Donzanti, B.A., J.S. Driscoll, J.E. Tomaszewski, J.S. Roth, P. Tosca, M. Placke, A. Singer, J.T. Yarrington and J.A. Kelley, 1994. Acute Cardiotoxicity of the Anti-HIV Dideoxynucleoside, F-ddA, in the Rat. Fund. Appl. Toxicol., 27, 167-176.

  7. Signatures of extra dimensional sterile neutrinos

    NASA Astrophysics Data System (ADS)

    Rodejohann, Werner; Zhang, He

    2014-10-01

    We study a large extra dimension model with active and sterile Dirac neutrinos. The sterile neutrino masses stem from compactification of an extra dimension with radius R and are chosen to have masses around eV or keV, in order to explain short-baseline anomalies or act as warm dark matter candidates. We study the effect of the sterile neutrino Kaluza-Klein tower in short-baseline oscillation experiments and in the beta spectrum as measurable by KATRIN-like experiments.

  8. The Microcalorimeter Arrays for a Rhenium Experiment (MARE): a next-generation calorimetric neutrino mass experiment

    E-print Network

    Monfardini, A; Brofferio, C; Capelli, S; Capozzi, F; Cremonesi, O; Enss, C; Fiorini, E; Fleischmann, A; Foggetta, L; Gallinaro, G; Gastaldo, L; Gatti, F; Giuliani, A; Gorla, P; Kelley, R; Kilbourne, C A; Margesin, B; McCammon, D; Nones, C; Nucciotti, A; Pavan, M; Pedretti, M; Pergolesi, D; Pessina, G; Porter, F S; Prest, M; Previtali, E; Repetto, P; Ribeiro-Gomez, M; Sangiorgio, S; Sisti, M

    2006-01-01

    Neutrino oscillation experiments have proved that neutrinos are massive particles, but can't determine their absolute mass scale. Therefore the neutrino mass is still an open question in elementary particle physics. An international collaboration is growing around the project of Microcalorimeter Arrays for a Rhenium Experiment (MARE) for directly measuring the neutrino mass with a sensitivity of about 0.2eV/c2. Many groups are joining their experiences and technical expertise in a common effort towards this challenging experiment. We discuss the different scenarios and the impact of MARE as a complement of KATRIN.

  9. The Microcalorimeter Arrays for a Rhenium Experiment (MARE): a next-generation calorimetric neutrino mass experiment

    E-print Network

    A. Monfardini; C. Arnaboldi; C. Brofferio; S. Capelli; F. Capozzi; O. Cremonesi; C. Enss; E. Fiorini; A. Fleischmann; L. Foggetta; G. Gallinaro; L. Gastaldo; F. Gatti; A. Giuliani; P. Gorla; R. Kelley; C. A. Kilbourne; B. Margesin; D. McCammon; C. Nones; A. Nucciotti; M. Pavan; M. Pedretti; D. Pergolesi; G. Pessina; F. S. Porter; M. Prest; E. Previtali; P. Repetto; M. Ribeiro-Gomez; S. Sangiorgio; M. Sisti

    2005-09-26

    Neutrino oscillation experiments have proved that neutrinos are massive particles, but can't determine their absolute mass scale. Therefore the neutrino mass is still an open question in elementary particle physics. An international collaboration is growing around the project of Microcalorimeter Arrays for a Rhenium Experiment (MARE) for directly measuring the neutrino mass with a sensitivity of about 0.2eV/c2. Many groups are joining their experiences and technical expertise in a common effort towards this challenging experiment. We discuss the different scenarios and the impact of MARE as a complement of KATRIN.

  10. Gifford-McMahon/Joule-Thomson cryocooler with high-flow-conductance counterflow heat exchanger for use in resistance thermometer calibration

    NASA Astrophysics Data System (ADS)

    Shimazaki, Takeshi; Toyoda, Keishi; Tamura, Osamu

    2006-03-01

    A cryocooler that consists of a two-stage Gifford-McMahon (GM) mechanical refrigerator and a Joule-Thomson (JT) expansion circuit is developed for use in resistance thermometer calibration. The cryocooler is designed to attain a lower temperature rather than to produce a higher cooling power. A simple but high-performance counterflow heat exchanger is developed for the cryocooler. The heat exchanger has a high flow conductance while maintaining a high heat exchange efficiency. It is an improved type of counterflow heat exchanger composed of a spiral capillary and a thin-wall straight outer tube. The developed cryocooler uses a single counterflow heat exchanger not like a conventional GM/JT cryocooler, which usually has two or three counterflow heat exchangers. He4 is used as the working fluid for the JT expansion circuit. The pot where the condensed He4 collects after the JT expansion can reach 1.3K in the continuous operation mode and 1.0K in the single-cycle operation mode. The cooling power of the cryocooler is 580?W at 1.34K with a molar flow rate of 300?mol/s. Temperature control of the pot was demonstrated from 1.4to12K using two control methods. One method involves controlling the evacuation speed in the JT circuit and the other involves controlling the heat input from a heater to the pot. The temperature of the pot is controlled within the order of magnitude of 2mK from peak to peak with either method.

  11. The C-Terminal 88 Amino Acids of the Sendai Virus P Protein Have Multiple Functions Separable by Mutation

    PubMed Central

    Tuckis, Jeffery; Smallwood, Sherin; Feller, Joyce A.; Moyer, Sue A.

    2002-01-01

    The Sendai virus P-L polymerase complex binds the NP-encapsidated nucleocapsid (NC) template through a P-NP interaction. To identify P amino acids responsible for binding we performed site-directed mutagenesis on the C-terminal 88 amino acids in the NC binding domain. The mutant P proteins expressed from plasmids were assayed for viral RNA synthesis and for various protein-protein interactions. All the mutants formed P oligomers and bound to L protein. While two mutants, JT3 and JT8, retained all P functions at or near the levels of wild-type (wt) P, three others—JT4, JT6, and JT9—were completely defective for both transcription and genome replication in vitro. Each of the inactive mutants retained significant NC binding but had a different spectrum of other binding interactions and activities, suggesting that the NC binding domain also affects the catalytic function of the polymerase. NC binding was inhibited by combinations of the inactive mutations. The remaining P mutants were active in transcription but defective in various aspects of genome replication. Some P mutants were defective in NP0 binding and abolished the reconstitution of replication from separate P-L and NP0-P complexes. In some of these cases the coexpression of the wt polymerase with the mutant NP0-P complex could rescue the defect in replication, suggesting an interaction between these complexes. For some P mutants replication occurred in vivo, but not in vitro, suggesting that the intact cell is providing an unknown function that cannot be reproduced in extracts of cells. Thus, the C-terminal region of P is complex and possesses multiple functions besides NC binding that can be separated by mutation. PMID:11739672

  12. Featured Image: The Q Continuum Simulation

    NASA Astrophysics Data System (ADS)

    Kohler, Susanna

    2015-10-01

    Each frame in this image (click for the full view!) represents a different stage in the simulated evolution of our universe, ending at present day in the rightmost panel. In a recently-published paper, Katrin Heitmann (Argonne National Laboratory) and collaborators reveal the results from and challenges inherent in the largest cosmological simulation currently available: the Q Continuum simulation. Evolving a volume of (1300 Mpc)3, this massive N-body simulation tracks over half a trillion particles as they clump together as a result of their mutual gravity, imitating the evolution of our universe over the last 13.8 billion years. Cosmological simulations such as this one are important for understanding observations, testing analysis pipelines, investigating the capabilities of future observing missions, and much more. For more information and the original image (as well as several other awesome images!), see the paper below.Citation:Katrin Heitmann et al 2015 ApJS 219 34. doi:10.1088/0067-0049/219/2/34

  13. Featured Image: The Q Continuum Simulation

    NASA Astrophysics Data System (ADS)

    Kohler, Susanna

    2016-01-01

    Each frame in this image (click for the full view!) represents a different stage in the simulated evolution of our universe, ending at present day in the rightmost panel. In a recently-published paper, Katrin Heitmann (Argonne National Laboratory) and collaborators reveal the results from and challenges inherent in the largest cosmological simulation currently available: the Q Continuum simulation. Evolving a volume of (1300 Mpc)3, this massive N-body simulation tracks over half a trillion particles as they clump together as a result of their mutual gravity, imitating the evolution of our universe over the last 13.8 billion years. Cosmological simulations such as this one are important for understanding observations, testing analysis pipelines, investigating the capabilities of future observing missions, and much more. For more information and the original image (as well as several other awesome images!), see the paper below.Citation:Katrin Heitmann et al 2015 ApJS 219 34. doi:10.1088/0067-0049/219/2/34

  14. Assessment of physical fitness and exercise tolerance in children with developmental coordination disorder.

    PubMed

    Farhat, Faiçal; Hsairi, Ines; Baiti, Hamza; Cairney, John; Mchirgui, Radhouane; Masmoudi, Kaouthar; Padulo, Johnny; Triki, Chahinez; Moalla, Wassim

    2015-01-01

    Children with developmental coordination disorder (DCD) have been shown to be less physically fit when compared to their typically developing peers. The purpose of the present study was to examine the relationships among body composition, physical fitness and exercise tolerance in children with and without DCD. Thirty-seven children between the ages of 7 and 9 years participated in this study. Participants were classified according to results obtained on the Movement Assessment Battery for Children (MABC) and were divided in 2 groups: 19 children with DCD and 18 children without DCD. All children performed the following physical fitness tests: The five-jump test (5JT), the triple-hop distance (THD) and the modified agility test (MAT). Walking distance was assessed using the 6-min walking test (6MWT). Children with DCD showed higher scores than children without DCD in all MABC subscale scores, as well as in the total score (p<0.001). Participants with DCD were found to perform significantly worse on the MAT (p<0.001), the THD (p<0.001) and 5JT (p<0.05). Moreover, children with DCD had poorer performance on the 6MWT than children without DCD (p<0.01). Our results found significant correlations among body mass index (BMI), THD (r=0.553, p<0.05), 5JT (r=0.480, p<0.05) and 6MWT (r=0.544, p<0.05) only in DCD group. A significant correlation between MAT and 5JT (r=-0.493, p<0.05) was found. Similarly, THD and 5JT (r=0.611, p<0.01) was found to be correlated in children with DCD. We also found relationships among 6MWT and MAT (r=-0.522, p<0.05) and the 6MWT and 5JT (r=0.472, p<0.05) in DCD group. In addition, we found gender specific patterns in the relationship between exercise tolerance, explosive strength, power, DCD, and BMI. In conclusion, the present study revealed that BMI was indicative of poorer explosive strength, power and exercise tolerance in children with DCD compared to children without DCD probably due to a limited coordination on motor control. PMID:26263407

  15. Plate Fin Heat Exchanger Model with Axial Conduction and Variable Properties

    E-print Network

    Hansen, B J; Klebaner, A; 10.1063/1.4706971

    2012-01-01

    Future superconducting radio frequency (SRF) cavities, as part of Project X at Fermilab, will be cooled to superfluid helium temperatures by a cryogenic distribution system supplying cold supercritical helium. To reduce vapor fraction during the final Joule-Thomson (J-T) expansion into the superfluid helium cooling bath, counter-flow, plate-fin heat exchangers will be utilized. Due to their compact size and ease of fabrication, plate-fin heat exchangers are an effective option. However, the design of compact and high-effectiveness cryogenic heat exchangers operating at liquid helium temperatures requires consideration of axial heat conduction along the direction of flow, in addition to variable fluid properties. Here we present a numerical model that includes the effects of axial conduction and variable properties for a plate fin heat exchanger. The model is used to guide design decisions on heat exchanger material choice and geometry. In addition, the J-T expansion process is modeled with the heat exchanger ...

  16. Experimental clean combustor program: Noise study

    NASA Technical Reports Server (NTRS)

    Sofrin, T. G.; Riloff, N., Jr.

    1976-01-01

    Under a Noise Addendum to the NASA Experimental Clean Combustor Program (ECCP) internal pressure fluctuations were measured during tests of JT9D combustor designs conducted in a burner test rig. Measurements were correlated with burner operating parameters using an expression relating farfield noise to these parameters. For a given combustor, variation of internal noise with operating parameters was reasonably well predicted by this expression but the levels were higher than farfield predictions and differed significantly among several combustors. For two burners, discharge stream temperature fluctuations were obtained with fast-response thermocouples to allow calculation of indirect combustion noise which would be generated by passage of the temperature inhomogeneities through the high pressure turbine stages of a JT9D turbofan engine. Using a previously developed analysis, the computed indirect combustion noise was significantly lower than total low frequency core noise observed on this and several other engines.

  17. Self-diffusion, conductivity, and long-wavelength plasma oscillations in strongly coupled two-component plasmas

    NASA Astrophysics Data System (ADS)

    Sjogren, L.; Hansen, J. P.; Pollock, E. L.

    1981-09-01

    The autocorrelation functions of the microscopic electric current J(t) and the electron velocity Z2(t) are calculated for strongly coupled semiclassical two-component plasmas. The corresponding memory functions are expressed in terms of mode-coupling integrals involving density- and energy-correlation functions in the framework of a microscopic kinetic theory which preserves the exact statics. The theory is applied to weakly degenerate hydrogen and carbon plasmas for values of the plasma parameter of order 1. The resulting correlation functions J(t) and Z2(t) and their integrals, the electrical conductivity, and the electron self-diffusion constant, agree reasonably well with the molecular dynamics data of Hansen and McDonald and with additional simulation results presented here.

  18. The pollution reduction technology program for can-annular combustor engines - Description and results

    NASA Technical Reports Server (NTRS)

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

    1976-01-01

    Pollutant reduction and performance characteristics were determined for three successively more advanced combustor concepts. Program Element I consisted of minor modifications to the current production JT8D combustor and fuel system to evaluate means of improved fuel preparation and changes to the basic airflow distribution. Element II addressed versions of the two-staged Vorbix (vortex burning and mixing) combustor and represented a moderate increase in hardware complexity and difficulty of development. The concept selected for Element III employed vaporized fuel as a means of achieving minimum emission levels and represented the greatest difficulty of development and adaptation to the JT8D engine. Test results indicate that the Element I single-stage combustors were capable of dramatic improvement in idle pollutants. The multistage combustors evaluated in Program Elements II and III simultaneously reduced CO, THC and NOx emissions, but were unable to satisfy the current 1979 EPA standards.

  19. Low pollution combustor designs for CTOL engines - Results of the Experimental Clean Combustor Program

    NASA Technical Reports Server (NTRS)

    Roberts, R.; Peduzzi, A.; Niedzwiecki, R. W.

    1976-01-01

    The NASA/Pratt & Whitney Aircraft Experimental Clean Combustor Program is a multi-year, major contract effort. Primary program objectives are the generation of combustor technology for development of advanced commercial CTOL engines with lower exhaust emissions than current aircraft and demonstration of this technology in a full-scale JT9D engine in 1976. This paper describes the pollution and performance goals, Phase I and II test results, and the Phase III combustor hardware, pollution sampling techniques, and test plans. Best results were obtained with the Vorbix concept which employs multiple burning zones and improved fuel preparation and distribution. Substantial reductions were achieved in all pollutant categories, meeting the 1979 EPA standards for NOx, THC, and smoke when extrapolated to JT9D cycle conditions. The Vorbix concept additionally demonstrated the capability for acceptable altitude relight and did not appear to have unsolvable durability or exit temperature distribution problems.

  20. Dynamic Jahn-Teller Effect in Negatively Charged Nitrogen-Vacancy Center in Diamond

    NASA Astrophysics Data System (ADS)

    Abtew, Tesfaye; Zhang, Peihong

    2011-03-01

    The negatively charged nitrogen-vacancy (NV) center in diamond has attracted much research interest recently owing to its desirable optical properties and long spin coherent lifetime. The ground state of NV- center has a 3 A2 symmetry, which can be optically excited, to a 3 E state. The excited state is orbitally degenerate therefore should experience either static or dynamic Jahn-Teller (JT) effects. We use accurate first-principles methods to study structural and electronic properties of the NV- center in diamond both in the ground and excited states. Our results indicate that the excited state of the NV- center is indeed a dynamic JT system. We acknowledge the Center for Computational Research at the University at Buffalo, SUNY. This work is supported by the National Science Foundation under Grant No. DMR-0946404 and by the Department of Energy under GrantNo. DE-SC0002623.