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1

Beta Reduction Constraints Manuel Bodirsky Katrin Erk  

E-print Network

Beta Reduction Constraints Manuel Bodirsky Katrin Erk Alexander Koller Joachim Niehren Programming Systems Lab Dept. of Computational Linguistics Universit¨at des Saarlandes, Saarbr¨ucken, Germany www.ps.uni-sb.de/~{bodirsky,erk

Paris-Sud XI, Université de

2

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

E-print Network

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

3

JT-60 Control System  

SciTech Connect

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has features of a functionally distributed and hierarchical structure, using CAMAC interfaces initially, which have been replaced by versatile module Europe (VME)-bus interfaces, and a protective interlock system composed of both software and hard-wired interlock logics.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

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

2002-09-15

4

Tools for electromagnetic field simulation in the KATRIN experiment  

E-print Network

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 ...

Corona, Thomas Joseph

2009-01-01

5

Electron line shape of the KATRIN monitor spectrometer  

NASA Astrophysics Data System (ADS)

Conversion electrons emitted from 83mKr implanted into a solid substrate will serve as a powerful tool for monitoring of the energy scale stability in the KATRIN neutrino experiment. An appropriate description of the conversion line shape is essential to determine the energy of the emitted electrons. It is shown that the Doniach-unji? line shape gives a significantly better fit to the conversion electron spectra than the previously used double Voigt model. The electron spectra were obtained with the KATRIN MAC-E filter monitor spectrometer.

Slezk, M.; Bauer, S.; Dragoun, O.; Erhard, M.; Schlsser, K.; palek, A.; Vnos, D.; Zbo?il, M.

2013-12-01

6

TOPOLOGICAL PRESSURE VIA SADDLE POINTS KATRIN GELFERT AND CHRISTIAN WOLF  

E-print Network

TOPOLOGICAL PRESSURE VIA SADDLE POINTS KATRIN GELFERT AND CHRISTIAN WOLF Abstract. Let. In this paper we study the topological pressure Ptop() (with respect to the dynamical system f|) for a wide pressure of is entirely determined by the values of on the saddle points of f in . Moreover, it is enough

Wolf, Christian

7

A Data-Analysis and Sensitivity-Optimization Framework for the KATRIN Experiment.  

E-print Network

??Presently under construction, the Karlsruhe TRitium Neutrino (KATRIN) experiment is the next generation tritium beta-decay experiment to perform a direct kinematical measurement of the electron (more)

Kleesiek, Marco

2014-01-01

8

Overview of the JT-60SA project  

NASA Astrophysics Data System (ADS)

This paper overviews the achievements and plans of the JT-60SA project which has been implemented jointly by Europe and Japan since 2007, covering the objectives, performance, schedule, design and procurement activities and on-site preparations. Re-baselining of the project was completed in late 2008. All of the scientific missions are preserved with the newly designed machine to meet the cost objectives. The construction of the JT-60SA has begun with procurement activities for components of the toroidal field magnet, poloidal field magnet, vacuum vessel, in-vessel components, cryostat, power supplies in parallel with dismantling the JT-60 facilities, at the end of which the first plasma is foreseen in 2016. For exploitation, development of the JT-60SA research plan has been started jointly between Japan and Europe.

Ishida, S.; Barabaschi, P.; Kamada, Y.; JT-60SA Team

2011-09-01

9

First tritium results of the KATRIN test experiment TRAP  

SciTech Connect

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)

Eichelhardt, F. [Universitaet Karlsruhe TH, P. O. Box 3640, D- 76021 Karlsruhe (Germany); Bornschein, B. [Forschungszentrum Karlsruhe GmbH, P.O. Box 3640, D-76021 Karlsruhe (Germany); Bornschein, L. [Universitaet Karlsruhe TH, P. O. Box 3640, D- 76021 Karlsruhe (Germany); Kazachenko, O.; Kernert, N. [Forschungszentrum Karlsruhe GmbH, P.O. Box 3640, D-76021 Karlsruhe (Germany); Sturm, M. [Universitaet Karlsruhe TH, P. O. Box 3640, D- 76021 Karlsruhe (Germany)

2008-07-15

10

Katrin E. Schmitt Optical neuronal guiding on the hypothalamic GnRH cell line GT1  

E-print Network

Copyright by Katrin E. Schmitt 2003 #12;Optical neuronal guiding on the hypothalamic GnRH cell line THE UNIVERSITY OF TEXAS AT AUSTIN August 2003 #12;Optical neuronal guiding on the hypothalamic GnRH cell line GT1;Optical neuronal guiding on the hypothalamic GnRH cell line GT1 Katrin Schmitt, M.A. The University

Raizen, Mark G.

11

Wall conditioning in JT-60  

NASA Astrophysics Data System (ADS)

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

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

1987-02-01

12

The thermal behaviour of the tritium source in KATRIN  

NASA Astrophysics Data System (ADS)

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

Grohmann, S.; Bode, T.; Htzel, M.; Schn, H.; Ser, M.; Wahl, T.

2013-05-01

13

KATRIN: an experiment to measure the neutrino mass  

E-print Network

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

R. G. H. Robertson; for the KATRIN Collaboration

2007-12-23

14

Penning discharge in the KATRIN pre-spectrometer  

NASA Astrophysics Data System (ADS)

The KArlsruhe TRItium Neutrino (KATRIN) experiment is a next-generation, large-scale tritium ?-decay experiment to determine the neutrino mass by investigating the kinematics of tritium ?-decay with a sensitivity of 200 meV/c2 using the MAC-E filter technique. In order to reach this sensitivity a low background level of 10-2 counts per second (cps) is required. A major background concern in MAC-E filters is the presence of Penning traps. A Penning trap is a special configuration of electromagnetic fields that allows the storage of electrically charged particles. This paper describes the mechanism of Penning discharges and the corresponding measurements performed at the test setup of the KATRIN pre-spectrometer. These investigations led to the conclusion that the observed electric breakdown, strong discharges and extremely large background rates were due to discharges caused by Penning traps located at both ends of the pre-spectrometer. Furthermore, the paper describes the design of a new set of electrodes (modified ground electrodes and new ``anti-Penning'' electrodes) to successfully remove these traps. After the installation of these electrodes in the pre-spectrometer, the measurements confirmed that the strong Penning discharges disappeared. The experience gained from the pre-spectrometer was used to design the electrode system of the main spectrometer. Recent measurements with the main spectrometer showed no indications of Penning trap related backgrounds.

Frnkle, F. M.; Glck, F.; Valerius, K.; Bokeloh, K.; Beglarian, A.; Bonn, J.; Bornschein, L.; Drexlin, G.; Habermehl, F.; Leber, M. L.; Osipowicz, A.; Otten, E. W.; Steidl, M.; Thmmler, T.; Weinheimer, C.; Wilkerson, J. F.; Wolf, J.; Zadorozhny, S. V.

2014-07-01

15

Semantic Role Labelling With Chunk Sequences Ulrike Baldewein, Katrin Erk, Sebastian Pad  

E-print Network

Semantic Role Labelling With Chunk Sequences Ulrike Baldewein, Katrin Erk, Sebastian Padó Saarland University Saarbrücken, Germany {ulrike,erk,pado}@coli.uni-sb.de Detlef Prescher University of Amsterdam

Padó, Sebastian

16

Analyzing models for semantic role assignment using confusability Katrin Erk and Sebastian Pad  

E-print Network

Analyzing models for semantic role assignment using confusability Katrin Erk and Sebastian Padó Computational Linguistics Saarland University Saarbrücken, Germany {erk,pado}@coli.uni-sb.de Abstract We analyze

Padó, Sebastian

17

An angular-selective electron source for the KATRIN experiment  

E-print Network

The KATRIN experiment is going to search for the average mass of the electron antineutrino with a sensitivity of 0.2 eV/c2. It uses a retardation spectrometer of MAC-E filter type to accurately measure the shape of the electron spectrum at the endpoint of tritium beta decay. In order to achieve the planned sensitivity the transmission properties of the spectrometer have to be understood with high precision for all initial conditions. For this purpose an electron source has been developed that emits single electrons at adjustable total energy and adjustable emission angle. The emission is pointlike and can be moved across the full flux tube that is imaged onto the detector. Here, we demonstrate that this novel type of electron source can be used to investigate the transmission properties of a MAC-E filter in detail.

M. Beck; K. Bokeloh; H. Hein; S. Bauer; H. Baumeister; J. Bonn; H. -W. Ortjohann; B. Ostrick; S. Rosendahl; S. Streubel; K. Valerius; M. Zboril; C. Weinheimer

2014-11-01

18

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

NASA Technical Reports Server (NTRS)

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.

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

1979-01-01

19

Data Processing and Analysis Systems for JT-60U  

SciTech Connect

The JT-60U data processing system is a large computer complex gradually modernized by utilizing progressive computer and network technology. A main computer using state-of-the-art CMOS technology can handle {approx}550 MB of data per discharge. A gigabit ethernet switch with FDDI ports has been introduced to cope with the increase of handling data. Workstation systems with VMEbus serial highway drivers for CAMAC have been developed and used to replace many minicomputer systems. VMEbus-based fast data acquisition systems have also been developed to enlarge and replace a minicomputer system for mass data.The JT-60U data analysis system is composed of a JT-60U database server and a JT-60U analysis server, which are distributed UNIX servers. The experimental database is stored in the 1TB RAID disk of the JT-60U database server and is composed of ZENKEI and diagnostic databases. Various data analysis tools are available on the JT-60U analysis server. For the remote collaboration, technical features of the data analysis system have been applied to the computer system to access JT-60U data via the Internet. Remote participation in JT-60U experiments has been successfully conducted since 1996.

Matsuda, T.; Totsuka, T.; Tsugita, T.; Oshima, T.; Sakata, S.; Sato, M.; Iwasaki, K. [Japan Atomic Energy Research Institute (Japan)

2002-09-15

20

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

E-print Network

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

Kirchhoff, Katrin

21

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

E-print Network

SHALMANESER­ A Toolchain For Shallow Semantic Parsing Katrin Erk and Sebastian Padó Computational Linguistics Saarland University Saarbrücken, Germany erk,pado@coli.uni-sb.de Abstract This paper presentsNet (Fillmore et al., 2003) for English, SALSA (Erk et al., 2003) for German, and the Prague Dependency Treebank

Padó, Sebastian

22

The SALSA Annotation Tool Katrin Erk and Andrea Kowalski and Sebastian Pad  

E-print Network

The SALSA Annotation Tool Katrin Erk and Andrea Kowalski and Sebastian Padó Department of Computational Linguistics Saarland University 66123 Saarbrücken erk,kowalski,pado@coli.uni-sb.de Abstract (Erk et al., 2003). 2 Design Input and output. The SALSA tool reads syn- tactically annotated corpora

Padó, Sebastian

23

Well-Nested Parallelism Constraints for Ellipsis Resolution Katrin Erk and Joachim Niehren  

E-print Network

Well-Nested Parallelism Constraints for Ellipsis Resolution Katrin Erk and Joachim Niehren Saarland University, Saarbr¨ucken, Germany erk@coli.uni-sb.de / niehren@ps.uni-sb.de Abstract The Constraint Language that model ellipsis. The sound and complete semi-decision procedure for CLLS (Erk et al., 2002) can be used

Paris-Sud XI, Université de

24

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

E-print Network

SALTO ­ A Versatile Multi-Level Annotation Tool Aljoscha Burchadt, Katrin Erk, Anette Frank Saarbr¨ucken, Germany {albu, erk, frank, kowalski, pado}@coli.uni-sb.de Abstract In this paper, we (Mengel and Lez- ius, 2000) as well as its own output format, SALSA/TIGER XML (Erk and Pado, 2004). TIGER

Padó, Sebastian

25

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

E-print Network

The SALSA Corpus: a German corpus resource for lexical semantics Aljoscha Burchardt, Katrin Erk, pado, pinkal}@coli.uni-sb.de Abstract This paper describes the SALSA corpus, a large German corpus manually annotated with role-semantic information, based on the syntactically annotated TIGER newspaper

Padó, Sebastian

26

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

E-print Network

Self-majorizing Elements in Archimedean Vector Lattices Katrin Teichert and Martin R. Weber is called self-majorizing if its modulus is a majorant, i.e. |x| n|| cx|| holds for some cx > 0 and all n. They are also known as semi-order units as the modulus of a self-majorizing element is an order unit in the band

Weber, Martin R.

27

Advances in JT-60U facilities and its operation  

Microsoft Academic Search

Recent advances in the JT-60 upgrade (JT-60U) facilities are described which have been made for supporting various physics programs aiming at obtaining reactor-grade plasmas with higher performance in quasi-steady state. It has been proved that B4C-converted (0.3 mm thick) carbon fiber composite (CFC) graphite divertor tiles and decaborane-based boronization using a mixture of deuterium and helium as working gas of

T. Kimura

1995-01-01

28

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

NASA Astrophysics Data System (ADS)

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

Frnkle, F. M.

2013-08-01

29

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

NASA Technical Reports Server (NTRS)

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.

1974-01-01

30

JT15D simulated flight data evaluation  

NASA Technical Reports Server (NTRS)

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

Holm, R. G.

1984-01-01

31

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

SciTech Connect

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.

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

2014-01-27

32

Electron line shape and transmission function of the KATRIN monitor spectrometer  

SciTech Connect

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

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

2013-12-30

33

Advances in JT-60U facilities and its operation  

SciTech Connect

Recent advances in the JT-60 upgrade (JT-60U) facilities are described which have been made for supporting various physics programs aiming at obtaining reactor-grade plasmas with higher performance in quasi-steady state. It has been proved that B{sub 4}C-converted carbon fiber composite (CFC) graphite divertor tiles and decaborane-based boronization using a mixture of deuterium and helium as working gas of glow discharge are effective for wall conditioning. For improving the confinement and edge plasma characteristics, the operation of divertor plasmas with a shape of high triangularity in excess of 0.4 has been started. Feedback control of neutron production by NBI injection has been demonstrated for establishment of advanced plasma control in the steady state operation. With regard to the heating systems, the increase in the NBI beam power up to 36 MW has accelerated the progress in the JT-60U plasma performance and the increase in the ICRF power up to 6.4 MW has progressed the studies on fast ion behavior, especially the TAE mode since 1994. Although ten years passed since the first plasma of the JT-60, the integrity of its main facilities has been kept by right maintenance activities. Two important developments of a negative-ion-based NBI system with beam energy of 500 keV and injection power of 10 MW and an advanced closed pumped divertor are now in progress towards the steady-state operation with high performance.

Kimura, T. [Japan Atomic Energy Research Inst., Naka, Ibaraki (Japan). Naka Fusion Research Establishment

1995-12-31

34

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

NASA Astrophysics Data System (ADS)

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

Vnos, D.; Slezk, M.; Dragoun, O.; Inoyatov, A.; Lebeda, O.; Pulec, Z.; Sentkerestiov, J.; palek, A.

2014-12-01

35

Impact of floods versus routing events on the thermohaline circulation Katrin J. Meissner and Peter U. Clark  

E-print Network

Impact of floods versus routing events on the thermohaline circulation Katrin J. Meissner and Peter events (long term, low amplitude) on the thermohaline circulation and the resulting climate change. We the potential of weakening the thermohaline circulation and therefore causing a cool event in the Northern

Kurapov, Alexander

36

The materials aspects of the JT-60 device  

NASA Astrophysics Data System (ADS)

JT-60 is the JAERI Tokamak, of which the objective is to achieve the break-even plasma condition making use of a hydrogen plasma. The construction of this device will be completed in the spring of 1985. The following seven items of JT-60 are discussed from the point of view of materials. (1) Vacuum vessel material: Inconel 625, (2) Liner plates as the first wall: Molybdenum and Inconel 625, (3) Fixed limiters, magnetic limiter plates and armor plates for neutral beam injection: Molybdenum, (4) Coating of the first wall: TiC, (5) In-situ coating of TiC within the torus, (6) Non-magnetic structural materials, and (7) Conductor materials for magnet coils.

Hasiguti, R. R.; Tomabechi, K.

1984-05-01

37

MIXING STUDY FOR JT-71/72 TANKS  

SciTech Connect

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.

Lee, S.

2013-11-26

38

Results of acoustic testing of the JT8D-109 refan engines  

NASA Technical Reports Server (NTRS)

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.

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

1975-01-01

39

Safety design of radiation shielding for JT-60SA  

Microsoft Academic Search

The radiation shielding, nuclear heating, absorbed dose of the insulator and dose rate have been evaluated for the superconducting tokamak JT-60SA. The shielding structure consists of double wall using the 24mm thickness of SS316L filled with the 140mm thickness of borated water (40C, 95% 10B enriched). The maximum nuclear heating of the winding at the inboard side of the superconducting

A. M. Sukegawa; S. Sakurai; K. Masaki; K. Kizu; K. Tsuchiya; Y. K. Shibama; T. Hayashi; H. Tamai; M. Matsukawa

2007-01-01

40

Initial Boronization of JT-60U Tokamak Using Decaborane  

Microsoft Academic Search

A decaborane-based boronization system has been installed in the JT-60U tokamak in order to reduce the influx of impurities during plasma discharges. Boronization has been performed under a glow discharge using a helium-decaborane gas mixture. The properties of the boron films deposited through boronization and the effects of boronization on the tokamak discharges were investigated. It was found that the

Masahiro Saidoh; Norio Ogiwara; Michiya Shimada; Takashi Arai; Hajime Hiratsuka; Tsuneyuki Koike; Masatsugu Shimizu; Hiromasa Ninomiya; Hiroo Nakamura; Ryutarou Jimbou; Jyunichi Yagyu; Tatsuo Sugie; Akira Sakasai; Nobuyuki Asakura; Masashi Yamage; Hideo Sugai; Gary L. Jackson

1993-01-01

41

JT9D ceramic outer air seal system refinement program  

NASA Technical Reports Server (NTRS)

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.

Gaffin, W. O.

1982-01-01

42

Design of superconducting coil system for remodeling JT-60  

Microsoft Academic Search

At JAERI a plan of remodeling JT-60 tokamak fusion device by using superconducting coil system is being considered to investigate performance of break-even plasma in long pulse operation. The coil system are composed of Toroidal Field (TF), Central Solenoid (CS) and Equilibrium Field (EF) coils. The TF coil is designed to have a maximum field of 7.4 T at winding

T. Ando; S. Ishida; T. Kato; M. Kikuchi; K. Kizu; M. Matsukawa; Y. M. Miura; H. Nakajima; A. Sakasai; K. Tsuchiya

2002-01-01

43

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

44

Production of a novel monoclonal antibody, JT-95, which can detect antigen of thyroid carcinoma.  

PubMed

Monoclonal antibody (MAb) JT-95 was produced by immunization of mice with membrane fractions of a human thyroid carcinoma. Immuno-histochemical staining has demonstrated that the antigen recognized by JT-95 is strongly expressed in 95 (95%) of 100 cases of papillary carcinomas and in 3 (75%) of 4 cases of follicular carcinomas. In benign diseases of the thyroid gland, MAb JT-95 reacted with 0 (0%) of 39 adenomas, 1 (4%) of 21 adenomatous goiters, 0 (0%) of 8 hyperthyroidism specimens, and 3 (38%) of 8 chronic thyroiditis specimens. The antigen detected by MAb JT-95 has an apparent Mr 250,000 in thyroid carcinomas. Moreover, circulating antigen in thyroid carcinoma patients was detected by MAb JT-95 in an ELISA and in Western blotting. The circulating antigen has a Mr 105,000. MAb JT-95 conjugated with (131) I was administrated to nude mice bearing a human thyroid carcinoma. JT-95 131I accumulation at the transplanted tumor was visualized by autoradiography with 2.68-14.75-fold higher levels detected at the xenograft compared to that for normal organs. Based on these data, MAb JT-95 may be useful in the diagnosis detection and therapy of thyroid carcinoma. PMID:8620498

Takeyama, H; Hosoya, T; Sakurai, K; Mori, Y; Watanabe, M; Kisaki, H; Ohno, T

1996-04-15

45

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

SciTech Connect

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.

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

2013-08-08

46

Electromagnetic design of the KATRIN large-volume air coil system  

E-print Network

The KATRIN experiment is designed to determine the absolute neutrino mass scale with a sensitivity of 200 meV (90 % CL) by measuring the electron energy spectrum close to the endpoint of molecular tritium beta decay. Electrons from a high-intensity gaseous tritium source are guided by a strong magnetic field of a few T to the analyzing plane of the main spectrometer where an integral energy analysis takes place in a low field region (Bcoil system surrounding the vessel. The system has two key tasks: to adjust and fine-tune the magnetic guiding field (Low Field Correction System), as well as to compensate the distorting effects of the earth magnetic field (Earth Field Compensation System). In this paper we outline the key electromagnetic design issues for this very large air coil system, which allows for well-defined electron transmission and optimized background reduction in the KATR...

Glck, Ferenc; Leiber, Benjamin; Mertens, Susanne; Osipowicz, Alexander; Reich, Jan; Wandkowsky, Nancy

2013-01-01

47

Scale model testing of the jet noise characteristics of the JT8D refan engine nozzle system  

NASA Technical Reports Server (NTRS)

The results are presented of static scale model acoustic tests of the nozzle system for the JT8D-9 baseline engine and candidate nozzle systems for JT8D-109, JT8D-115, and JT8D-117 refan engines. The objective of these tests was to determine the jet noise benefit of the three refan engine cycles relative to the baseline JT8D-9, and to provide acoustic information toward selection of the optimum primary-secondary area match and centerbody contour for the refan engine cycles. One of the nozzle configurations was tested with and without simulated turbine exit swirl to determine what effect, if any, swirl has no jet noise. The JT8D-109 cycle was found to afford approximately 9 db (0ASPL) jet noise reduction relative to the JT8D-9 when compared on an equal static thrust basis. The JT8D-115 and JT8D-117 afford an 8 db and 6 db reduction, respectively, relative to the JT8D-9, at equal static thrust. Turbine exit swirl was found to have no significant effect on the jet noise of the JT8D-109 nozzle system.

Reed, D. H.

1974-01-01

48

Combined Brayton-JT cycles with refrigerants for natural gas liquefaction  

NASA Astrophysics Data System (ADS)

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.

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

2012-06-01

49

JT8D high pressure compressor performance improvement  

NASA Technical Reports Server (NTRS)

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.

Gaffin, W. O.

1981-01-01

50

Initial Boronization of JT-60U Tokamak Using Decaborane  

NASA Astrophysics Data System (ADS)

A decaborane-based boronization system has been installed in the JT-60U tokamak in order to reduce the influx of impurities during plasma discharges. Boronization has been performed under a glow discharge using a helium-decaborane gas mixture. The properties of the boron films deposited through boronization and the effects of boronization on the tokamak discharges were investigated. It was found that the deposition of a boron layer with high purity was achieved with few impurities other than hydrogen through boronization, and that the present boronization deposited toroidally nonuniform boron film. It was also found that the decaborane-based boronization resulted in good plasma performance similar to that of conventional boronization.

Saidoh, Masahiro; Ogiwara, Norio; Shimada, Michiya; Arai, Takashi; Hiratsuka, Hajime; Koike, Tsuneyuki; Shimizu, Masatsugu; Ninomiya, Hiromasa; Nakamura, Hiroo; Jimbou, Ryutarou; Yagyu, Jyunichi; Sugie, Tatsuo; Sakasai, Akira; Asakura, Nobuyuki; Yamage, Masashi; Sugai, Hideo; Jackson, Gary L.

1993-07-01

51

Initial boronization of JT-60U tokamak using decaborane  

NASA Astrophysics Data System (ADS)

A decaborane-based boronization system has been installed in the JT-60U tokamak in order to reduce the influx of impurities during plasma discharges. Boronization has been performed under a glow discharge using a helium-decaborane gas mixture. The properties of the boron films deposited through boronization and the effects of boronization on the tokamak discharges were investigated. It was found that the deposition of a boron layer with high purity was achieved with few impurities other than hydrogen through boronization and that the present boronization deposited toroidally nonuniform boron film. It was also found that the decaborane-based boronization resulted in good plasma performance similar to that of conventional boronization.

Saidoh, Masahiro; Ogiwara, Norio; Shimada, Michiya; Arai, Takashi; Hiratsuka, Hajime; Koike, Tsuneyuki; Shimizu, Masatsugu; Ninomiya, Hiromasa; Nakamura, Hiroo; Jimbou, Ryutarou

1993-07-01

52

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

NASA Technical Reports Server (NTRS)

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.

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

1975-01-01

53

Monitoring of the properties of the KATRIN Windowless Gaseous Tritium Source  

E-print Network

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

Babutzka, M; Bonn, J; Bornschein, B; Dieter, A; Drexlin, G; Eitel, K; Fischer, S; Glck, F; Grohmann, S; Htzel, M; James, T M; Kfer, W; Leber, M; Monreal, B; Priester, F; Rllig, M; Schlsser, M; Schmitt, U; Sharipov, F; Steidl, M; Sturm, M; Telle, H H; Titov, N

2012-01-01

54

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

E-print Network

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

Bauer, S; Hochschulz, F; Ortjohann, H -W; Rosendahl, S; Thmmler, T; Schmidt, M; Weinheimer, C

2013-01-01

55

J.T. and Margaret Talkington Margaret and J.T. Talkington were well-known as the founders and owners of Margaret's, a  

E-print Network

to customer service and quality. Their customers, known as "Margaret's Women," came from Dallas and other Promotion Division of the National Retail Merchants Association and Direct Marketing Magazine. Margaret and J.T. were model entrepreneurs who understood the importance of building not just a business

Rock, Chris

56

Transient simulation of a miniature Joule-Thomson (J-T) cryocooler with and without the distributed J-T effect  

NASA Astrophysics Data System (ADS)

The aim of this work is to develop a transient program for the simulation of a miniature Joule-Thomson (J-T) cryocooler to predict its cool-down characteristics. A one dimensional transient model is formulated for the fluid streams and the solid elements of the recuperative heat exchanger. Variation of physical properties due to pressure and temperature is considered. In addition to the J-T expansion at the end of the finned tube, the distributed J-T effect along its length is also considered. It is observed that the distributed J-T effect leads to additional cooling of the gas in the finned tube and that it cannot be neglected when the pressure drop along the length of the finned tube is large. The mathematical model, method of resolution and the global transient algorithm, within a modular object-oriented framework, are detailed in this paper. As a part of verification and validation of the developed model, cases available in the literature are simulated and the results are compared with the corresponding numerical and experimental data.

Damle, R. M.; Atrey, M. D.

2015-01-01

57

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

E-print Network

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

Washington at Seattle, University of

58

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)

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.

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

1982-01-01

59

Absolute calibration of microfission chamber in JT-60U  

SciTech Connect

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.

Hayashi, Takao; Nishitani, Takeo; Sukegawa, Atsuhiko M.; Ishikawa, Masao; Shinohara, Kouji [Japan Atomic Energy Agency, Mukouyama 801-1, Naka, Ibaraki 311-0193 (Japan)

2008-10-15

60

Oxygen chemisorption compressor study for cryogenic J-T refrigeration  

NASA Technical Reports Server (NTRS)

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.

Jones, Jack A.; Blue, Gary D.

1987-01-01

61

Present knowledge about the materials behavior in JT-60  

NASA Astrophysics Data System (ADS)

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

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

1988-07-01

62

Preliminary Studies of the JT-60SA Cryogenic System  

NASA Astrophysics Data System (ADS)

For the superconducting tokamak JT-60SA, one of the major projects within the Broader Approach Agreement between Europe and Japan, CEA is in charge of the cryoplant system. Preliminary studies were performed in order to prepare the specifications. The presentation focuses on the modelling of two operating modes, the baking and the cool down, and on a study of the economics of the electrical power distribution of the warm compression station. Baking mode consists in heating the vacuum vessel to 473 K during several days to "clean" surfaces. Because of the increased radiation heat loads from the vacuum vessel on the thermal shields, the helium mass flow at 80 K has to be increased by 50%. To avoid designing the cryogenic plant for this occasional overload, different scenarios were studied. During cool down mode, the mass flows have been calculated to ensure the required cool down speed. The limiting factors are the pressure drop in the coil windings and the magnet cool down speed. The warm compressor station represents a large part of the investment cost and is the main consumer of electrical power of the cryogenic system. Different compressors and motors have been analysed to optimise power consumption vs. investment costs.

Lamaison, V.; Balaguer, D.; Gros, G.; Hoa, C.; Marchal, J. L.; Michel, F.; Reynaud, P.; Roussel, P.; Wanner, M.

2010-04-01

63

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

Federal Register 2010, 2011, 2012, 2013

...Directives; Pratt & Whitney JT8D-9, -9A, -11, -15, -17, and -17R Turbofan Engines...Pratt & Whitney (PW) JT8D-9, -9A, -11, -15, -17, and -17R turbofan engines...proposed AD applies to PW JT8D-9, -9A, -11, - 15, -17, and -17R turbofan...

2010-10-08

64

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

SciTech Connect

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

Kasugai, Atsushi; Takahashi, Koji; Sakamoto, Keishi; Ikeda, Yukiharu; Ikeda, Yoshitaka; Tsuneoka, Masaki [RF Heating Laboratory, Naka Fusion Research Establishment, Japan Atomic Energy Research Institute (JAERI), Naka-machi, Ibaraki-ken, Japan 311-0193 (Japan); Kariya, Tsuyoshi; Mitsunaka, Yoshika [Electron Tubes and Devices Division, Toshiba Corporation, Ohtawara-shi, Tochigi, 324-8550 (Japan); Imai, Tsuyoshi

1999-09-20

65

Summary and analysis of performance and stability characteristics of the refan JT8D-109 engine  

NASA Technical Reports Server (NTRS)

The refan JT8D-109 performance and stability characteristics are reported as determined from sea level testing, altitude testing, and DC-9 flight testing. The test results are summarized as follows: (1) TSFC at SLS achieved design goal of 12.66 percent reduction. (2) TSFC at altitude average cruise power 0.5 percent higher than design goal, (3) TSFC at altitude maximum cruise power 1.7-3.7 percent higher than design goal, (4) ground starting consistent with JT8D-9 base engine, (5) successful flight starts without starter assist, (6) transient surge margin equivalent to JT8D-9, (7) stable engine operation with inlet distortion, and (8) stable engine operation during snap acceleration and deceleration. A flight idle setting is required for acceptable aborted-landing go-around acceleration time due to increase in low-rotor moment of inertia, and a performance improvement program should be conducted as part of any future certification program.

Sanberg, K. G.; Mogielnicki, R. M.; Davis, J. C.; Scaramella, V. M.

1975-01-01

66

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

NASA Astrophysics Data System (ADS)

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.

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

2010-04-01

67

Estimation of Freezing Point of Hydrocarbon and Hydrofluorocarbon Mixtures for Mixed Refrigerant jt Cryocooler  

NASA Astrophysics Data System (ADS)

Estimating the freezing point of refrigerant is an essential part in designing an MR JT (Mixed refrigerant Joule-Thomson) cryocooler to prevent itself from clogging and to operate with stability. There were researches on estimating freezing point, but some of them resulted in the wrong prediction of clogging. In this paper, the freezing point of the MR is precisely estimated with caution of clogging. The solubility of HC (hydrocarbon) and HFC (hydrofluorocarbon) mixture components are obtained with their activity coefficients, which represent the molecular interaction among the components. The freezing points of the MR JT cryocooler are systematically investigated in the operating temperature range from 70 K to 90 K.

Hwang, G.; Lee, J.; Jeong, S.

2010-04-01

68

Minimization of Reactive Power Fluctuation in JT-60SA Magnet Power Supply  

NASA Astrophysics Data System (ADS)

This paper describes an asymmetric control method for the firing angle and a start/stop timing shift control of four thyristor converters called Booster PS" to minimize the reactive power fluctuation during plasma initiation in JT-60SA. From the simulation using the PSCAD/EMTDC" code, it is found that these control methods can drastically reduce the reactive power induced by the four units of the Booster PS". In addition, the voltage fluctuation of the motor-generator connected to the Booster PS" is expected to be suppressed. This can also contribute to achieve stable control of the JT-60SA magnet power supplies.

Shimada, K.; Terakado, T.; Yamauchi, K.; Matsukawa, M.; Baulaigue, O.; Coletti, R.; Coletti, A.; Novello, L.

2013-02-01

69

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

NASA Astrophysics Data System (ADS)

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 910-19 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.

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

2001-01-01

70

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

Federal Register 2010, 2011, 2012, 2013

...the Airworthiness Limitations Section (ALS) of the manufacturer's Instructions for...additional revisions to the JT9D series engines ALS sections of the manufacturer's ICA. This...engines. That AD requires revisions to the ALS of the manufacturer's ICA to include...

2011-11-22

71

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

NASA Technical Reports Server (NTRS)

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

1975-01-01

72

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

Microsoft Academic Search

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

J. H. Miles

1982-01-01

73

JT150 1\\/2-scale nozzle jet noise experiment and comparison with prediction  

Microsoft Academic Search

As part of a program to study flight effects on the exhaust noise of a full scale JT15D engine, static half scale model jet noise experiments were conducted. Acoustic data were recorded for microphone angles of 45 deg to 155 deg with jet conditions for the model scale nozzle corresponding closely to those at 55, 73 and 97 percent of

D. E. Groesbeck; C. A. Wasserbauer

1983-01-01

74

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

SciTech Connect

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.

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

1996-04-01

75

Severe Septic Patients with Mitochondrial DNA Haplogroup JT Show Higher Survival Rates: A Prospective, Multicenter, Observational Study  

PubMed Central

Objective In a previous cohort study (n=96), we found an association between mitochondrial (mt) DNA haplogroup JT and increased survival of severe septic patients, after controlling for age and serum lactic acid levels. The aim of this research was to increase the predictive accuracy and to control for more confounder variables in a larger cohort (n=196) of severe septic patients, to confirm whether mtDNA haplogroup JT influences short and medium-term survival in these patients. Methods We conducted a prospective, multicenter, observational study in six Spanish Intensive Care Units. We determined 30-day and 6-month survival and mtDNA haplogroup in this second cohort of 196 patients and in the global cohort (first and second cohorts combined) with 292 severe septic patients. Multiple logistic regression and Cox regression analyses were used to test for the association of mtDNA haplogroups JT with survival at 30-days and 6-months, controlling for age, sex, serum interleukin-6 levels and SOFA score. Results Logistic and Cox regression analyses showed no differences in 30-day and 6-month survival between patients with mtDNA haplogroup JT and other haplogroups in the first cohort (n=96). In the second cohort (n=196), these analyses showed a trend to higher 30-day and 6-month survival in those with haplogroup JT. In the global cohort (n=292), logistic and Cox regression analyses showed higher 30-day and 6-month survival for haplogroup JT. There were no significant differences between J and T sub-haplogroups in 30-day and 6-month survival. Conclusions The global cohort study (first and second cohorts combined), the largest to date reporting on mtDNA haplogroups in septic patients, confirmed that haplogroup JT patients showed increased 30-day and 6-month survival. This finding may be due to single nucleotide polymorphism defining the whole haplogroup JT and not separately for J or T sub-haplogroups. PMID:24069186

Martn, Mara M.; Lpez-Gallardo, Esther; Sol-Violn, Jordi; Blanquer, Jos; Labarta, Lorenzo; Daz, Csar; Borreguero-Len, Juan Mara; Jimnez, Alejandro; Montoya, Julio; Ruiz-Pesini, Eduardo

2013-01-01

76

Direct loss of energetic electrons during lower hybrid current drive in JT-60U  

NASA Astrophysics Data System (ADS)

Direct loss of energetic electrons during lower hybrid current drive in JT-60U is identified through measurements of X-ray signals from the divertor plates. It is found that the lost power decreases with increasing electron density and with increasing launched wave N|| and is characterized by the slowing down time of the electrons accelerated by lower hybrid waves. At ne ~ 0.5 1019 m-3 and N|| ~ 1.4, about 5-10% of the injected power is lost through the energetic electrons; the maximum current drive efficiency is obtained at a plasma current of 1.2 MA in JT-60U. It is also found that the confinement of high energy electrons is improved by increasing the plasma current. These results suggest that the power lost directly through energetic electrons will be negligible in ITER in steady state operation

Ushigusa, K.; Kondoh, T.; Naito, O.; Ikeda, Y.; Ide, S.; Seki, M.; Wolfe, S. W.; Sato, M.; Kamada, Y.; Itami, K.; Imai, T.

1992-11-01

77

Development of TiC coated wall materials for JT-60  

NASA Astrophysics Data System (ADS)

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

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

1985-08-01

78

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

Microsoft Academic Search

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

Gaffin

1979-01-01

79

Evaluation of radiation shielding, nuclear heating and dose rate for JT-60 superconducting modification  

Microsoft Academic Search

The radiation shielding, nuclear heating and dose rate have been evaluated for JT-60 superconducting modification. The double-walled structure of a vacuum vessel was adopted so that the maximum nuclear heating at the inboard side of the superconducting TF coil could be suppressed to be lower than 2.5 mW\\/cm3. The 316 stainless steel (SS316L) boards outside the vacuum vessel are installed

A. Morioka; A. Sakasai; K. Masaki; S. Ishida; N. Miya; M. Matsukawa; A. Kaminaga; A. Oikawa

2002-01-01

80

?>*)3>OOOlt>A -j^t I Ris-R-628(EN)  

E-print Network

in the form of extended abstracts of the Joint Nordic Spring Meeting '92 including the 3rd Nordic Conference?>*«)3>OOOlt>A -j^t D I Risø-R-628(EN) Proceedings oftheJoint Nordic Spring Meeting '92 Edited by Per-Anker Lindgård JOINT NORDIC SPRING MEETING 7-10 MAY 1992 Nyborg Strand, Denmark Risø National

81

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

Microsoft Academic Search

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

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

2002-01-01

82

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

SciTech Connect

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.

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

1990-05-01

83

Boronization effects using deuterated-decaborane (B 10D 14) in JT-60U  

Microsoft Academic Search

Boronization effects have been systematically investigated using discharges with identical conditions in JT-60U. In ?50 shots after boronization using 70 g of B10D14, the carbon content decreased due to suppression of the chemical sputtering of carbon tiles while the boron content increased. In contrast to the boron and carbon contents, the oxygen content gradually increased from ?0.7% to ?1.3% in

T. Nakano; S. Higashijima; H. Kubo; J. Yagyu; T. Arai; N. Asakura; K. Itami

2003-01-01

84

Effectiveness of the Text Display in Bilingual Presentation of JSL\\/JT for Emergency Information  

Microsoft Academic Search

This paper describes an experiment on the message transmission effectiveness achieved by adding Japanese text (JT) to a Japanese\\u000a sign language (JSL) video. The transmission efficiency of information and the understanding of information are quantitatively\\u000a measured. The situation assumed is that information about a vehicle accident is to be displayed in a railroad carriage to\\u000a deaf people. Three information methods

Shunichi Yonemura; Shin'ichiro Eitoku; Kazuo Kamata

2009-01-01

85

Hydrogen isotope retention and impurity deposition of carbon based components used in JT-60U  

NASA Astrophysics Data System (ADS)

Various types of carbon based components, such as isotropic graphite, carbon fiber composite (CFC-2D felt type) and B 4C-overlaid CFC/graphite were used for divertor and first wall tiles in JT-60U. Surface analysis of tiles exposed to discharge shots in JT-60U, was performed using MeV region ion beam. The retention of deuterium for each tile was distributed between 6 10 20 and 6 10 21 m -2. Highest deuterium retention was observed on the outboard, lower part of first wall tiles. Metallic impurity measurement was performed by X-PIXE. The dominant species were Fe, Cr, Ni, Cu, Mo and Zn of which total concentration as high as 10 21 m -2. This value is one order of magnitude smaller than that of JT-60. Highest oxygen concentration examined by RBS was observed on the B 4C converted graphite tile. Carbon tile containing B 4C is shown to be useful for oxygen gettering compared with an other.

Amemiya, S.; Masuda, T.; Ando, T.; Kodama, K.; Masaki, K.

1995-04-01

86

Impurity and particle recycling reduction by boronization in JT-60U  

NASA Astrophysics Data System (ADS)

In JT-60U boronization using decaborane was carried out. Boronization reduced the oxygen impurity in OH discharges and shortened the wall conditioning after the vacuum vessel vent and consequently enabled JT-60U to produce clean plasmas easily except for NB heated plasmas. After boronization, particle recycling was reduced drastically in OH and NB discharges. High confinement plasmas were obtained including high ?p mode and H-mode discharges. In the latest boronization part of divertor plates were replaced with B 4C coated tiles with a B 4C thickness 300 ?m. After introducing B 4C divertor tiles, an explosive generation of boron particles from the tiles was observed. By the combined effects of boronization with decaborane and boron generation from B 4C tiles, oxygen impurity was so low that oxygen line signals were reduced to noise levels after the latest boronization. On the other hand, boron burst from the B 4C tiles restricted the operation of JT-60U.

Higashijima, S.; Sugie, T.; Kubo, H.; Tsuji, S.; Shimada, M.; Asakura, N.; Hosogane, N.; Kawano, Y.; Nakamura, H.; Itami, K.; Sakasai, A.; Shimizu, K.; Ando, T.; Saidoh, M.

1995-04-01

87

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

Federal Register 2010, 2011, 2012, 2013

...Directives; Pratt & Whitney JT8D-9, -9A, -11, -15, -17, and -17R Turbofan Engines...Pratt & Whitney (PW) JT8D-9, -9A, -11, -15, -17, and -17R turbofan engines...the Federal Register published on April 11, 2000 (65 FR 19477-78)....

2010-05-19

88

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)

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.

1975-01-01

89

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

NASA Astrophysics Data System (ADS)

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.

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

2004-10-01

90

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

NASA Technical Reports Server (NTRS)

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.

Janus, A. S.

1981-01-01

91

Detailed Analysis of the Transient Voltage in a JT-60SA PF Coil Circuit  

NASA Astrophysics Data System (ADS)

A superconducting coil system is actually complicated by the distributed parameters, e.g. the distributed mutual inductance among turns and the distributed capacitance between adjacent conductors. In this paper, such a complicated system was modeled with a reasonably simplified circuit network with lumped parameters. Then, a detailed circuit analysis was conducted to evaluate the possible voltage transient in the coil circuit. As a result, an appropriate (minimum) snubber capacitance for the Switching Network Unit, which is a fast high voltage generation circuit in JT-60SA, was obtained.

Yamauchi, K.; Shimada, K.; Terakado, T.; Matsukawa, M.; Coletti, R.; Lampasi, A.; Gaio, E.; Coletti, A.; Novello, L.

2013-02-01

92

JT-60U Plasma Current Measurement by an Optical Current Transformer  

SciTech Connect

In a nuclear fusion experiment device, a plasma discharge is to be sustained for a long time in steady state operation. In such a device an electromagnetic sensor that has a signal integrator to measure direct currents will cause a technical problem of zero point drift on signals. Therefore, the detection device using new technology for direct current measurement, optical current transformer (optical CT), was developed. The device has an optical fiber specified for 850 and 1550nm (wavelength) were manufactured, and was applied to current measurement in JT-60U experiments. A gamma ray irradiation examination was also done to the optical CT.

Arai, Takashi [Japan Atomic Energy Research Institute (Japan); Nishiyama, Tomokazu [Japan Atomic Energy Research Institute (Japan); Yagyu, Junichi [Japan Atomic Energy Research Institute (Japan); Kasai, Satoshi [Japan Atomic Energy Research Institute (Japan); Sone, Isamu [Power and Industrial Systems R and D Laboratory, Hitachi Ltd. (Japan); Abe, Mitsushi [Power and Industrial Systems R and D Laboratory, Hitachi Ltd. (Japan); Miya, Naoyuki [Japan Atomic Energy Research Institute (Japan)

2004-01-15

93

Aerodynamic performance of 0.4066-scale model to JT8D refan stage  

NASA Technical Reports Server (NTRS)

The aerodynamic performance of a scale model of the split flow JT8D rafan stage is presented over a range of flows at speeds from 40 to 100 percent design. The bypass stage peak efficiency of 0.800 occurred at a total weight flow of 35.82 kilograms per second and a pressure ratio of 1.697. The stall margin was 15 percent based on pressure ratio and weight flow at stall and peak efficiency conditions. The data indicated that the hub region of the core stators was choked at design speed over the entire flow range tested.

Moore, R. D.; Kovich, G.; Tysl, E. R.

1976-01-01

94

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

of metamorphic rocks from the Tobacco Root Mountains region, Montana, in Brady, J.B., Burger, H.R., Cheney, J.T., and Harms, T.A., eds., Precambrian geology of the Tobacco Root Mountains, Montana: Boulder, Colorado ages of metamorphic rocks from the Tobacco Root Mountains region, Montana John B. Brady Dana N. Kovaric

Brady, John B.

95

Transient Heat Transport in Subcooled He II Associated with JT Effect  

NASA Astrophysics Data System (ADS)

Transient heat transport in subcooled He II has been investigated in a 1 m long rectangular channel with distributed contractions: one-closed end has a heater, while the other end is open to the He II bath. Experiments were conducted applying heat pulses and recording the temperature profile with seven Allan Bradley resistors placed along the channel. Cernox sensor was indium soldered on the heater surface to monitor the onset of film boiling. As the onset of heat pulse, the pressure at the heater surface increased because of phase change from subcooled He II to He I. Further increasing of heat pulse leads to coexistence of triple-phase, He I vapor layer, He I and subcooled He II, at the vicinity of heater surface. These effects induced instantaneous He II temperature drop along the channel, which is caused by Joule-Thomson (JT) effect. A simple model gives an approximate mechanism of pressure increase in the channel. The paper describes transient heat transport mechanism in the channel and discusses JT effect within the channel.

Maekawa, R.; Iwamoto, A.; Hamaguchi, S.

2004-06-01

96

Transient Heat Transport in Subcooled He II Associated with JT Effect  

SciTech Connect

Transient heat transport in subcooled He II has been investigated in a 1 m long rectangular channel with distributed contractions: one-closed end has a heater, while the other end is open to the He II bath. Experiments were conducted applying heat pulses and recording the temperature profile with seven Allan Bradley resistors placed along the channel. Cernox sensor was indium soldered on the heater surface to monitor the onset of film boiling. As the onset of heat pulse, the pressure at the heater surface increased because of phase change from subcooled He II to He I. Further increasing of heat pulse leads to coexistence of triple-phase, He I vapor layer, He I and subcooled He II, at the vicinity of heater surface. These effects induced instantaneous He II temperature drop along the channel, which is caused by Joule-Thomson (JT) effect. A simple model gives an approximate mechanism of pressure increase in the channel. The paper describes transient heat transport mechanism in the channel and discusses JT effect within the channel.

Maekawa, R.; Iwamoto, A.; Hamaguchi, S. [National Institute for Fusion Science, Toki, Gifu 509-5292 (Japan)

2004-06-23

97

Properties of thin boron coatings formed during deuterated-boronization in JT-60  

NASA Astrophysics Data System (ADS)

Since 1992, the boronization using B10H14 (decaborane-based boronization) has been utilized in JT-60 once or twice a year. It is very effective in reducing both the impurities, like oxygen and carbon, in the plasma and in recycling fuel particles. However, we needed 500 discharges to exchange hydrogen in the boron film for deuterium, after the boronization using only He for a dilution gas. Using a mixed-dilution gas of He and deuterium, we made the boronized film on JT-60 first wall (deuterated-boronization). A typical composition of working gas was 2% B 10H 14, 38% D 2 and 60% He, which was used in a flow through situation. The amounts of hydrogen and deuterium in the boronized film were evaluated to be 5 and 30 at%, respectively. In addition, the deuteration factor of {D}/{(H + D)} in the first plasma after the boronization increased from less than 0.2 to 0.8. Thus, we can drastically reduce the number of the conditioning discharges from 500 to 50 for the isotope-exchange before D plasma experiments.

Yagyu, J.; Ogiwara, N.; Saidoh, M.; von Seggern, J.; Okabe, T.; Miyo, Y.; Hiratsuka, H.; Yamamoto, S.; Goppelt-Langer, P.; Aoki, Y.; Takeshita, H.; Naramoto, H.

1997-02-01

98

Development and operation of first wall in JT-60U high-power heated discharges  

SciTech Connect

In JT-60U, the highest fusion product of 1.2 {times} 10{sup 21} keV sm{sup {minus}3} was recorded in July 1994, and the confinement performance has been also improved in the quasi-steady states (duration time {approximately}1.5s). The JT-60U has various wall conditioning methods. In particular, boronization system using decaborane and B{sub 4}C-converted CFC divertor tiles were effective for reduction of the oxygen impurity and particle recycling. In the latest boronization session, gas mixture of deuterium and helium was used in glow discharge instead of helium only to reduce the hydrogen content in the boron film. On the other hand, the B{sub 4}C-converted CFC tiles caused, so called, the real-time solid target boronization (STB) by plasma impact, and then low concentration level of impurities was achieved. Water cooling of the divertor tiles, which was carried out in October 1994, was also effective for the reduction of impurity production. The amount of neutron and tritium generated by D-D reaction have also increased with the improved plasma performance. From the measurement of the tritium in the first wall tiles, it is expected that tritium of 1.6 {times} 10{sup 10} Bq, which corresponds to approximately 50% of tritium generated until 1993, still remained in the first wall.

Masaki, K.; Kodama, K.; Arai, T.; Hiratsuka, H.; Yagyu, J.; Saidoh, M.; Ogiwara, N.; Higashijima, S. [JAERI, Naka, Ibaraki (Japan). Naka Fusion Research Establishment

1995-12-31

99

Development and achievements on the high power ECRF system in JT-60U  

NASA Astrophysics Data System (ADS)

An output power of 1.5 MW for 1 s was achieved at 110 GHz in a recent gyrotron development using the JT-60U ECRF system. It is the world's highest power oscillation for a pulse duration of at least 1 s. The achievement was enabled by, in addition to the carefully designed cavity and collector, necessary because of thermal stress, an RF shield for the adjustment bellows and a low-dielectric-loss dc break. The way the power was modulated was improved upon by controlling the anode voltage, with high modulation frequency of 5 kHz being achieved in NTM stabilization experiments. Moreover, as a developmental step to realizing a reliable ECRF system for use in future fusion experiments, a long pulse demonstration of 0.4 MW and a 30 s injection into the plasma was achieved with real time control of the anode/cathode-heater. Confirmation was made that the temperature of the cooled components had been saturated with no evidence of any damage being discovered in the waveguides and antenna without forced cooling. An innovative antenna with a relatively wide range of beam steering capabilities utilizing a linearly moving-mirror concept was also designed for use as an active cooling antenna with longer pulses in the future, e.g. for JT-60SA. The beam profile and mechanical strength analyses proved the feasibility of the antenna.

Moriyama, S.; Kobayashi, T.; Isayama, A.; Terakado, M.; Sawahata, M.; Suzuki, S.; Yokokura, K.; Shimono, M.; Hasegawa, K.; Hiranai, S.; Igarashi, K.; Sato, F.; Suzuki, T.; Wada, K.; Shinozaki, S.; Seki, M.; Kasugai, A.; Takahashi, K.; Kajiwara, K.; Sakamoto, K.; Fujii, T.

2009-08-01

100

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

NASA Technical Reports Server (NTRS)

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

1975-01-01

101

JT90 Ceramic Outer Air Seal System Refinement Program, Phase 2  

NASA Technical Reports Server (NTRS)

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

Shiembob, L. T.

1982-01-01

102

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

Federal Register 2010, 2011, 2012, 2013

...proposed to require installation of crushable sleeve...published in the OEM's engine manual. We agree...substantial direct effect on the States...of the JT8D-200 Engine Manual, Part No...Criteria for All Engine Models Listed in...Crushable Sleeve Spacer Installation (q) At next...

2011-03-24

103

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

Federal Register 2010, 2011, 2012, 2013

...was prompted by reports of cracks in five high-pressure compressor (HPC) shafts. This AD requires removing certain HPC shafts...PW) JT9D-7R4H1 turbofan engines with a high-pressure compressor (HPC) shaft, part number (P/N) 808070 or 808071,...

2011-12-12

104

Fast colon centreline calculation using optimised 3D topological thinning Robert J.T. Sadleir*, Paul F. Whelan  

E-print Network

Fast colon centreline calculation using optimised 3D topological thinning Robert J.T. Sadleir thinning can be used to accurately identify the central path through a computer model of the colon the task of navigation within the colon model. Unfortunately standard topological thinning is an extremely

Whelan, Paul F.

105

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

NASA Technical Reports Server (NTRS)

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.

Gaffin, W. O.

1979-01-01

106

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

PubMed

A digital signal processing (DSP) system is applied to stilbene scintillation detectors of the multichannel neutron emission profile monitor in JT-60U. Automatic analysis of the neutron-? pulse shape discrimination is a key issue to diminish the processing time in the DSP system, and it has been applied using the two-dimensional (2D) map. Linear discriminant function is used to determine the dividing line between neutron events and ?-ray events on a 2D map. In order to verify the validity of the dividing line determination, the pulse shape discrimination quality is evaluated. As a result, the ?-ray contamination in most of the beam heating phase was negligible compared with the statistical error with 10 ms time resolution. PMID:21033854

Ishii, K; Shinohara, K; Ishikawa, M; Baba, M; Isobe, M; Okamoto, A; Kitajima, S; Sasao, M

2010-10-01

107

Boronization effects using deuterated-decaborane (B 10D 14) in JT-60U  

NASA Astrophysics Data System (ADS)

Boronization effects have been systematically investigated using discharges with identical conditions in JT-60U. In 50 shots after boronization using 70 g of B 10D 14, the carbon content decreased due to suppression of the chemical sputtering of carbon tiles while the boron content increased. In contrast to the boron and carbon contents, the oxygen content gradually increased from 0.7% to 1.3% in 500 shots. Continual boronization using 10-20 g of B 10D 14 every 200 shots successfully kept the oxygen content less than 1.0%. However, the durability of boronization using 20 g of B 10D 14 is much shorter than that of boronization using 70 g after vacuum vessel ventilation. Due to the reduction of the carbon and oxygen contents, Zeff in 50 shots after boronization lies in the lowest range of the database.

Nakano, T.; Higashijima, S.; Kubo, H.; Yagyu, J.; Arai, T.; Asakura, N.; Itami, K.

2003-03-01

108

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

SciTech Connect

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.

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

2001-02-27

109

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

NASA Astrophysics Data System (ADS)

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

Sone, K.; Murakami, Y.

1984-05-01

110

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

SciTech Connect

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

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

2010-10-15

111

Generation of the Katrine hurricane during the geomagnetic extrastrom at crossing of the heliospheric current sheet: Is it an accidental coincidence or physical essence?  

NASA Astrophysics Data System (ADS)

Attention is paid to the generation of the Katrine hurricane with destructive consequences during the geomagnetic extrastorm of August 24, 2005, at a repeated crossing of the strongly disturbed IMF sector boundary. This fact is discussed in the light of the Eigenson-Usmanov hypothesis that solar activity can affect generation of hurricanes. According to the law of enhancement, solar activity and corresponding geomagnetic disturbances increase baric contrasts in the lower atmosphere over oceans on the Earths dayside hemisphere and decrease background pressure at tropical latitudes. It has been assumed that this can be one of the factors facilitating triggering of the positive feedback mechanisms necessary for generation and maintenance of hurricanes according to the Golitsyn [1999] model.

Ivanov, K. G.

2006-10-01

112

1 EX/P4-16 Localized Tungsten Deposition in Divertor Region in JT-60U  

E-print Network

Abstract. Deposition profiles of tungsten released from the outer divertor were studied in JT-60U. A neutron activation method was used for the first time to accurately measure deposited tungsten. Surface density of tungsten in the thick carbon deposition layer can be measured by this method. Tungsten was mainly deposited on the inner divertor (around inner strike points) and on the outer wing of the dome. Toroidal distribution of the W deposition was significantly localized near the tungsten released position, while other metallic impurities such as Fe, Cr, Ni were distributed more uniformly. These data indicate that inward drift in the divertor region played a significant role in tungsten transport in JT-60U. 1.

Y. Ueda; M. Fukumoto; J. Watanabe; Y. Ohtsuka; T. Arai; N. Asakura; Y. Nobuta; M. Sato; T. Nakano; J. Yagyu; K. Ochiai; K. Takakura

113

Impact of arcing on carbon and tungsten: from the observations in JT-60U, LHD and NAGDIS-II  

NASA Astrophysics Data System (ADS)

Arcing is a long-standing plasma-surface interaction issue, and the issue is currently being revived. This paper assesses the impact of arcing in fusion devices based on the observations in JT-60U, the Large Helical Device (LHD) and the linear divertor simulator NAGDIS-II. To investigate the first initiation process of arcing, field emission currents from several tungsten samples are measured. It is shown that the field emission current increases significantly after tungsten is exposed to helium plasmas. A postmortem analysis of JT-60U tiles reveals that arcing phenomena occurred on carbon baffle plates inside the vacuum vessel in JT-60U. From the observation of the arc trails recorded on the baffle plate, the amount of eroded materials is discussed. The arcing seems to occur frequently on the inner baffles rather than the outer baffles. From LHD, it is shown that the arcing can be initiated on nanostructured tungsten even without transient events. The erosion of tungsten by arcing will become an important issue in a fusion reactor, where helium fluence is significantly increased. From the experiments in NAGDIS-II, it is shown that arcing can be initiated even without transient heat load when the target voltage is low enough, e.g. -500 V. Frequent initiation of arcing annihilates the nanostructure growth due to helium plasma irradiation on the surface.

Kajita, Shin; Fukumoto, Masakatsu; Tokitani, Masayuki; Nakano, Tomohide; Noiri, Yasuyuki; Ohno, Noriyasu; Masuzaki, Suguru; Takamura, Shuichi; Yoshida, Naoaki; Ueda, Yoshio

2013-05-01

114

Investigation of performance deterioration of the CF6/JT9D high bypass ratio turbofan engines  

NASA Technical Reports Server (NTRS)

The extent and magnitude of performance deterioration of the Pratt and Whitney JT9D, and the General Electric CF6 engine models is presented. Overall engine and contributing module performance deterioration with respect to flight cycles and/or time are analyzed. The overall engine performance deterioration analyses are based on data obtained from historical records, special engine tests, and tests for specific effects. Hardware inspection data from overhaul shops and special module tests are the basis for the modular performance deterioration data used in the analyses. Various damage mechanisms such as seal rubs, erosion, surface roughness and thermal distortion, and how they contribute to performance deterioration are included in the modular analyses. Results indicate that early performance deterioration occurring within the first few flights of these engines is less than 1 percent in cruise specific fuel consumption (SFC), that it is event oriented, and that it is the result of increased blade tip clearances. This performance deterioration gradually increases to about 2.5 to 3.0 percent (including the initial short term deterioration) after 2500 to 3000 flights where increased blade tip clearances, airfoil quality degradation, and thermal distortion are the contributing causes.

Ziemianski, J. A.

1981-01-01

115

JT150 1/2-scale nozzle jet noise experiment and comparison with prediction  

NASA Technical Reports Server (NTRS)

As part of a program to study flight effects on the exhaust noise of a full scale JT15D engine, static half scale model jet noise experiments were conducted. Acoustic data were recorded for microphone angles of 45 deg to 155 deg with jet conditions for the model scale nozzle corresponding closely to those at 55, 73 and 97 percent of corrected rated speed for the full scale engine. These data are useful for determining the relative importance of jet and core noise in the static full scale engine test data and will in turn allow for a proper evaluation of flight effects on the exhaust noise results. The model scale data are also compared with the coaxial jet noise prediction. Above 1000 Hz, the prediction is nominally 0 to 3 dB higher than the data. The arithmetic mean of the differences between the experimental OASPL and the predicted OASPL for all angles for each run ranged from 0 to -3.2 dB. The standard deviation of all the OASPL differences is 2.2 dB. The discrepancies are greatest at low primary jet velocities and appear to be due to inadequacy in the variable jet density exponent incorporated in the prediction procedure.

Groesbeck, D. E.; Wasserbauer, C. A.

1983-01-01

116

Edge Stability in Disappearance of Giant ELMs in JT-60U High Triangularity Discharges  

NASA Astrophysics Data System (ADS)

On JT-60U, the appearance of giant ELMs limits the edge pressure gradient (the critical ?-parameter) of H-mode. The critical ?-parameter increases with the internal inductance li and close to the high n ideal ballooning mode. The critical ?-parameter also increases with triangularity footnote Y. Kamada et al., Plasma Phys. Control. Fusion 38 (1996) 1387. Recently, a slow growth of the pedestal structure in the giant-ELMy phase was observed in a long pulse high ?p ELMy H-mode discharges with high triangularity (? ~0.45-0.5). The pedestal width and the pedestal ion temperature increase gradually with a long time constant ~2 sec. Simultaneously, ?p increases and li decreases. At a low q_95 ~3.5, giant ELM activity survives throughout the NB heating phase. On the other hand, at high q_95 ~5-6, amplitude of the giant ELM gradually decreases and finally it disappears. Then the pedestal width and the pedestal temperature increase further, and li decreases simultaneously. The access to the second stability regime to high-n ballooning mode is one of the possible explanations. The stability analyses with the detailed edge treatment in equilibirum reconstruction and the relation with the evolution of the edge bootstrap current are presented.

Oikawa, T.; Kamada, Y.; Lao, L. L.

1999-11-01

117

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

NASA Technical Reports Server (NTRS)

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).

Miles, J. H.

1982-01-01

118

Impurity control by boronization and optimization of the wall temperature in JT-60U  

NASA Astrophysics Data System (ADS)

In JT-60U, boronization using deuterated decaborane has been applied to suppress oxygen production. Boronization decreased the oxygen content in the core plasma from ~ 3% to ~ 0.5%. The oxygen content of ~ 0.5% was kept by additional boronization about every 100 shots. By lowering the vessel temperature from 540 K to 420 K, chemical sputtering yield decreased by ~ 40% at the carbon divertor plates. For hydrogen plasmas, the carbon content reduced from 3.1% to 1.8% in L-mode discharges with NB heating power of 13 MW ,and from 2.4% to 1.7% in reversed shear discharges. For deuterium plasmas, however, the carbon content did not depend on the vessel temperature. The different dependence of the carbon content on the vessel temperature is considered to be due to isotopic difference between chemical and physical sputtering yield. The effects of boronization and the vessel temperature will be discussed based on correlation between impurity content and impurity influx from the divertor plates and the first walls.

Nakano, T.; Higashijima, S.; Kubo, H.; Sugie, T.; Asakura, N.; Takenaga, H.; Itami, K.

2001-10-01

119

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

NASA Technical Reports Server (NTRS)

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.

Sallee, G. P.

1978-01-01

120

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

NASA Astrophysics Data System (ADS)

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

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

1984-12-01

121

Module-type flat-field grazing-incidence spectrographs for large Tokamak (JT-60) plasma diagnosis  

NASA Astrophysics Data System (ADS)

Module-type flat-field grazing-incidence spectrographs with holographic gratings and multichannel detectors for large TOKAMAK (JT-60) plasma diagnosis are developed. The spectrographs cover the different wavelength regions from 0.5-122 nm, and are set to measure impurity lines in the plasma every 20 ms with space resolution of 7 cm. The flat-field imaging properties with designed wavelength resolution were confirmed, and results of tokamak plasma measurements proved the value of these spectrographs for plasma diagnosis.

Nagata, Hiroshi; Kihara, Naoto; Yamashita, Takaji; Sugie, Tatsuo; Kubo, Hirotaka; Shiho, Makoto

1990-09-01

122

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

NASA Technical Reports Server (NTRS)

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

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

1976-01-01

123

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

SciTech Connect

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.

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. [Japan Atomic Energy Research Institute (Japan)

2002-09-15

124

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

SciTech Connect

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

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

2001-10-16

125

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

NASA Technical Reports Server (NTRS)

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.

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

1980-01-01

126

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

PubMed

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 200mm-long and 0.3mm thickness piece of target tissue was possible and simulated in a gelatin solution. The developed probe produced a greater than 53Kmin(-1) cooling rate and the cooling temperature was below 253K to satisfy the required cell death conditions. PMID:25164379

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

2014-11-01

127

Collective Thomson scattering based on CO2 laser for ion energy spectrum measurements in JT-60U  

NASA Astrophysics Data System (ADS)

A collective Thomson scattering (CTS) diagnostic system based on a pulsed CO2 laser has been developed and brought into operation to establish a measurement technique for ion temperature and the energy spectrum of fast ions. The pulsed CO2 laser (wavelength 10.6 ?m, beam energy 15 J, pulse width 1 ?s) and a heterodyne receiver were installed on the JT-60U tokamak. Calculation of the scattered power spectrum from high temperature plasma in JT-60U shows that a good signal-to-noise value is expected for the bulk-ion temperature measurement. Calibration of the heterodyne receiver system has been carried out using a large area (1212 cm2) blackbody radiation source. Commissioning of the CTS system by injecting the CO2 laser into the plasmas has been accomplished. However, a scattered signal has not yet been detected due to electrical noise originating from the pulsed lasers discharge and stray signal coming from mode impurities in the pulsed laser. After the electrical and stray light reduction, ion temperature will be evaluated from the scattered spectrum using the CTS system.

Kondoh, T.; Miura, Y.; Lee, S.; Richards, R. K.; Hutchinson, D. P.; Bennett, C. A.

2003-03-01

128

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

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

White, Robert D.

129

Particle simulations of energetic particle driven Alfvn modes in JT-60U G. Fogaccia, S. Briguglio, G. Vlad, F. Zonca, K. Shinohara, M. Ishikawa, M. Takechi  

E-print Network

Particle simulations of energetic particle driven Alfvén modes in JT-60U G. Fogaccia, S. Briguglio in the central plasma region. Such a change can be attributed to a redistribution of the energetic ions growth rate and fluctuating field level, and much smaller redistribution of the energetic ions. Most

Vlad, Gregorio

130

Particle simulations of energetic particle driven Alfvn modes in JT-60U G. Fogaccia, S. Briguglio, G. Vlad, F. Zonca, K. Shinohara, M. Ishikawa, M. Takechi  

E-print Network

Particle simulations of energetic particle driven Alfvén modes in JT-60U G. Fogaccia, S. Briguglio of the energetic ions, with a marked reduc- tion of their on-axis density. The period between ALEs appears of the energetic ions. Most of them consist of bifurcating branches, chirping up and down in frequency. Aim

Zonca, Fulvio

131

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

E-print Network

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

Zhao, Xuepu

132

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

...11392-009] J&T Hydro Company; H. Dean Brooks and W. Bruce Cox; Notice of Application for Transfer of License and Soliciting...T Hydro Company (transferor) and W. Dean Brooks, and H. Bruce Cox (transferees) filed an application for transfer of...

2010-01-20

133

Minutes taken by Secretary Christopher Kulesza Page 1 of 5 Speakers: Mark J.T. Smith, Dean of the Graduate School  

E-print Network

Minutes taken by Secretary Christopher Kulesza Page 1 of 5 Speakers: Mark J.T. Smith, Dean with highly talented individuals to consider. >Committee will give a short list to the Board of Trustees Meeting -Approved Unanimously- #12;Minutes taken by Secretary Christopher Kulesza Page 2 of 5 III. Officer

Ginzel, Matthew

134

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

E-print Network

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

Paris-Sud XI, Université de

135

Approach to a window coating problem by in situ transmission monitoring and laser blow-off cleaning developed in the JT-60U Thomson scattering system  

Microsoft Academic Search

For solving a window coating problem, an in situ window transmission monitoring by inferring it precisely from a known attenuation of the deposited film has been developed in the JT-60U Thomson scattering system. Also the practicability of an in situ window cleaning based on a laser blow-off technique has been investigated extensively. The coated film composition could be guessed to

H. Yoshida; O. Naito; T. Hatae; A. Nagashima

1997-01-01

136

Active Control of Inlet Noise on the JT15D Turbofan Engine  

NASA Technical Reports Server (NTRS)

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.

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

1999-01-01

137

Unsteady fan blade pressure and acoustic radiation from a JT15D-1 turbofan engine at simulated forward speed  

NASA Technical Reports Server (NTRS)

Tests have been conducted on a JT15D-1 turbofan engine both statically and at simulated forward speed in the Ames 12 x 24 Meter Wind Tunnel. Both far-field acoustic data and unsteady pressure data from transducers mounted on the fan blades were acquired. Results showed a sound power reduction of about 10 dB in the far-field acoustic levels with simulated forward speed over those measured without forward speed. Blade mounted transducer results showed rotor-turbulence interaction dominated the noise field at very low speeds while an interaction between the rotor and internal struts dominated at higher speeds. Results are presented to show the effects of varying engine rpm, changing the angle-of-attack of the engine inlet to tunnel flow and mounting an aircraft wing to simulate an installation condition on an actual aircraft.

Preisser, J. S.; Schoenster, J. A.; Golub, R. A.; Horne, C.

1981-01-01

138

Investigation of performance deterioration of the CF6/JT9D, high-bypass ratio turbofan engines  

NASA Technical Reports Server (NTRS)

The aircraft energy efficiency program within NASA is developing technology required to improve the fuel efficiency of commercial subsonic transport aricraft. One segment of this program includes engine diagnostics which is directed toward determining the sources and causes of performance deterioration in the Pratt and Whitney Aircraft JT9D and General Electric CF6 high-bypass ratio turbofan engines and developing technology for minimizing the performance losses. Results of engine performance deterioration investigations based on historical data, special engine tests, and specific tests to define the influence of flight loads and component clearances on performance are presented. The results of analysis of several damage mechanisms that contribute to performance deterioration such as blade tip rubs, airfoil surface roughness and erosion, and thermal distortion are also included. The significance of these damage mechanisms on component and overall engine performance is discussed.

Ziemianski, J. A.; Mehalic, C. M.

1980-01-01

139

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

NASA Astrophysics Data System (ADS)

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

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

2007-06-01

140

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

NASA Technical Reports Server (NTRS)

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.

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

1980-01-01

141

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

SciTech Connect

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.

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

2014-07-01

142

Role of convective amplification of n = 1 energetic particle modes for N-NB ion dynamics in JT-60U  

NASA Astrophysics Data System (ADS)

The hybrid code MEGA is used to simulate an abrupt large-amplitude event (ALE) in JT-60U shot E039672 that was strongly driven by a pair of negative-ion-based neutral beams (N-NBs). This configuration is known to be unstable to energetic particle modes (EPMs) with toroidal mode number n = 1. The purpose of this study is to look for a threshold with respect to the on-axis fast ion beta value, ?h0, beyond which the EPM undergoes convective amplification (CA) and causes significant fast ion transport. This is motivated by the hypothesis that such a threshold may work as a trigger mechanism for relaxation events, such as ALE. In order to facilitate quantitative comparisons with the experiment, a realistic geometry and bulk pressure is used. Furthermore, MEGA is initialized with a fast ion distribution computed for JT-60U by an orbit-following Monte-Carlo code, and a passive vacuum region allows particles to travel without encountering artificial loss boundaries. Consistently with the experiment, the simulation predicts a burst time of about 0.3 ms and peak magnetic fluctuation levels around ?B?/B < 10-3 at the plasma boundary. As ?h0 is increased, a gradual increase in the CA of the EPM and in the convective transport of both resonant and nonresonant particles is found. The absence of a sharp transition between low- and high-amplitude fluctuations leads to the conclusion that the onset of CA does not suffice as a trigger mechanism for ALE.

Bierwage, A.; Shinohara, K.; Aiba, N.; Todo, Y.

2013-07-01

143

Fast Super-Resolution Imaging with Ultra-High Labeling Density Achieved by Joint Tagging Super-Resolution Optical Fluctuation Imaging (JT-SOFI)  

E-print Network

Previous stochastic localization-based super-resolution techniques are largely limited by the labeling density and the fidelity to the morphology of specimen. We report on an optical super-resolution imaging scheme implementing joint tagging using multiple fluorescent blinking dyes associated with super-resolution optical fluctuation imaging (JT-SOFI), achieving ultra-high labeling density super-resolution imaging. To demonstrate the feasibility of JT-SOFI, quantum dots with different emission spectra were jointly labeled to the tubulin in COS7 cells, creating ultra-high density labeling. After analyzing and combining the fluorescence intermittency images emanating from spectrally resolved quantum dots, the microtubule networks are capable of being investigated with high fidelity and remarkably enhanced contrast at sub-diffraction resolution. The spectral separation also significantly decreased the frame number required for SOFI, enabling fast super-resolution microscopy through simultaneous data acquisition....

Zeng, Zhiping; Wang, Hening; Huang, Ning; Shan, Chunyan; Zhang, Hao; Teng, Junlin; Xi, Peng

2015-01-01

144

Analyses of Hydrogen Isotope Distributions in the Outer Target Tile used in the W-shaped Divertor of JT-60U  

Microsoft Academic Search

Hydrogen isotope distributions of the outer divertor target CFC tile, in the W-shaped divertor of JT-60U where erosion dominated, were analyzed by secondary ion mass spectroscopy (SIMS) to study the correlation between the concentrations of hydrogen isotopes and erosion\\/deposition rate. The chemical states of the CFC tile surfaces were analyzed by X-ray photoelectron spectroscopy (XPS). The existence of re-deposition layers

Y. Oya; Y. Morimoto; M. Oyaidzu; Y. Hirohata; J. Yagyu; Y. Miyo; Y. Gotoh; K. Sugiyama; K. Okuno; N. Miya; T. Hino; S. Tanaka; T. Tanabe

2004-01-01

145

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

SciTech Connect

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.

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

2013-09-15

146

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

NASA Technical Reports Server (NTRS)

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.

Joynes, D.; Balut, J. P.

1974-01-01

147

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

SciTech Connect

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.

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

2006-10-15

148

Dynamics of low-n shear Alfvn modes driven by energetic N-NB ions in JT-60U  

NASA Astrophysics Data System (ADS)

Dynamics of fast ions and shear Alfvn waves are simulated using MEGA, a global nonlinear hybrid code. The scenario considered is based on JT-60U shot E039672, driven by strong negative-ion-based neutral beams (N-NB), just before the onset of a so-called abrupt large event (ALE). It is found that modes with toroidal mode numbers n = 2, 3, 4 can be destabilized, besides the n = 1 mode studied previously. The properties of the modes with n > 1 are sensitive to the value of the plasma beta and the form of the fast ion distribution, so simulation conditions are set up as realistically as presently possible. When the fast ion drive exceeds a certain threshold, the n = 3 mode is enhanced through a convective amplification process while following fast ions were displaced either by the n = 3 mode itself or by the n = 1 mode. The fast ion transport in several cases, simulated with single- or multiple-n modes, is analysed and implications of the results for the explanation of ALEs are discussed.

Bierwage, A.; Todo, Y.; Aiba, N.; Shinohara, K.

2014-10-01

149

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

SciTech Connect

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.

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

2010-03-15

150

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

NASA Technical Reports Server (NTRS)

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

1975-01-01

151

Cruise Drag Results from High Speed Wind Tunnel Tests of NASA Refan JT8D Engine Nacelles on the Boeing 727-200  

NASA Technical Reports Server (NTRS)

High speed wind tunnel test results are presented showing the cruise drag effect of installing JT8D-109 Refan engines on a Boeing 727-200. Incremental drags of a refan center inlet and side nacelles are presented for several configuration variations. Static pressure distributions were obtained on the side nacelle strut and on the fuselage (above and below the strut). Oil flow photographs of selected configurations are also presented. In general the drag level of the refan installation is slightly better than predicted prior to the test and the drag rise is favorable.

Easterbrook, W. G.; Carlson, R. B.

1973-01-01

152

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

SciTech Connect

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.

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

2014-01-29

153

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

NASA Astrophysics Data System (ADS)

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.

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

2014-01-01

154

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

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.

Kawakami, S.; Ohno, N. [Graduate School of Engineering, Nagoya University, Nagoya 464-8603 (Japan)] [Graduate School of Engineering, Nagoya University, Nagoya 464-8603 (Japan); Shibata, Y.; Isayama, A.; Kawano, Y. [Japan Atomic Energy Agency, Naka 311-0193 (Japan)] [Japan Atomic Energy Agency, Naka 311-0193 (Japan); Watanabe, K. Y. [Graduate School of Engineering, Nagoya University, Nagoya 464-8603 (Japan) [Graduate School of Engineering, Nagoya University, Nagoya 464-8603 (Japan); National Institute for Fusion Science, Toki 509-5292 (Japan); Takizuka, T. [Graduate School of Engineering, Osaka University, Suita 565-0871 (Japan)] [Graduate School of Engineering, Osaka University, Suita 565-0871 (Japan); Okamoto, M. [Ishikawa National College of Technology, Ishikawa 929-0392 (Japan)] [Ishikawa National College of Technology, Ishikawa 929-0392 (Japan)

2013-11-15

155

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

SciTech Connect

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.

Yoshida, Masafumi, E-mail: yoshida.masafumi@jaea.go.jp; 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 [Japan Atomic Energy Agency, 801-1, Mukoyama, Naka 311-0193 (Japan)] [Japan Atomic Energy Agency, 801-1, Mukoyama, Naka 311-0193 (Japan); Grisham, Larry R. [Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)] [Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)

2014-02-15

156

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

PubMed

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

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

2008-10-01

157

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)

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.

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

158

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

SciTech Connect

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

Kojima, Atshushi; Kamiya, Kensaku; Fujita, Takaaki; Kamada, Yutaka [Japan Atomic Energy Agency, Naka, Ibaraki 311-0193 (Japan); Iguchi, Harukazu [National Institution of Fusion Science, Toki, Gifu 509-5292 (Japan); Kakiuchi, Hideto [Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577 (Japan)

2008-09-15

159

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)

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.

1973-01-01

160

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

SciTech Connect

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

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

2011-05-15

161

Flight effects on noise by the JT8D engine with inverted primary/fan flow as measured in the NASA-Ames 40 by 80 foot wind tunnel  

NASA Technical Reports Server (NTRS)

A JT8D-17R engine with inverted primary and fan flows was tested under static conditions as well as in the NASA Ames 40 by 80 Foot Wind Tunnel to determine static and flight noise characteristics, and flow profile of a large scale engine. Test and analysis techniques developed by a previous model and JT8D engine test program were used to determine the in-flight noise. The engine with inverted flow was tested with a conical nozzle and with a plug nozzle, 20 lobe nozzle, and an acoustic shield. Wind tunnel results show that forward velocity causes significant reduction in peak PNL suppression relative to uninverted flow. The loss of EPNL suppression is relatively modest. The in-flight peak PNL suppression of the inverter with conical nozzle was 2.5 PNdb relative to a static value of 5.5 PNdb. The corresponding EPNL suppression was 4.0 EPNdb for flight and 5.0 EPNdb for static operation. The highest in-flight EPNL suppression was 7.5 EPNdb obtained by the inverter with 20 lobe nozzle and acoustic shield. When compared with the JT8D engine with internal mixer, the inverted flow configuration provides more EPNL suppression under both static and flight conditions.

Strout, F. G.

1978-01-01

162

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)

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.

1975-01-01

163

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

NASA Astrophysics Data System (ADS)

High heat flux experiments have been previously carried out on three kinds, namely low pressure plasma spray (LPPS), chemical vapor deposition (CVD) and conversion (CVR) methods, of B4C-overlaid CFC's using the JAERI electron beam irradiation system (JEBIS). As a result, it turned out that CVR method has the best adhesion property between B4C layer and bulk carbon. However, thicker B4C layer is necessary to use in long period as the divertor tiles of JT-60U. The purpose of this experiment is to investigate the thermal property of B4C-converted carbon based materials which have thicker B4C layer than the previous experiments. Irradiations were performed under two different heating conditions, namely in the normal condition (5-20 MW/m(exp 2), 5 s) and in the disruption conditions (1100-1600 MW/m(exp 2), 2-3 ms). The dimensions of the samples were 25 mm x 25 mm x 25 mm, and B4C-converted layers were made on the three kinds of CFC's and fifth kinds of isotropic graphites. The thickness of B4C layer was 150-1300 (mu)m. Measurements were made with respect to the weight loss, changes of the surface morphology and the surface temperature. In the normal condition, the damages such as surface melting and exfoliation were not observed on the samples which have B4C layer below 600 (mu)m in thickness. In the disruption condition, melting and exfoliation were observed on the surfaces of the samples whose substrates were PD-330S, PD-600S and HCB-5S, and melting was observed on the surfaces of the samples whose substrates were PCC-2S, MFC-1, MCI-felt, ETP-10 and STP-60. It is considered that the porous layer in the B4C layer caused the severe exfoliation from the measurement of the surface composition.

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

1994-03-01

164

Measurement of type-I edge localized mode pulse propagation in scrape-off layer using optical system of motional Stark effect diagnostics in JT-60U.  

PubMed

Propagation of plasma ejected by type-I edge localized mode (ELM) has been measured in scrape-off layer (SOL) of the JT-60U tokamak, using optical system of motional Stark effect (MSE) diagnostics as beam emission spectroscopy (BES) diagnostics through a new technique developed. This MSE/BES system measures Dalpha emission from heating neutral beam excited by collisions with the ejected plasma, as well as background light (e.g., bremsstrahlung). While spatio-temporal change in the beam emission gives information on propagation of the ejected plasma, the background light that is observed simultaneously in all spatial channels veils the information. In order to separate the beam emission and the background light, a two-wavelength detector is newly introduced into the MSE/BES system. The detector observes simultaneously at the same spatial point in two distinct wavelengths using two photomultiplier tubes through two interference filters. One of the filters is adjusted to the central wavelength of the beam emission for the MSE diagnostics, and the other is outside the beam emission spectrum. Eliminating the background light, temporal change in the net beam emission in the SOL has been evaluated. Comparing conditionally averaged beam emission with respect to 594 ELMs in a discharge at five spatial channels (0.02-0.3 m outside the main plasma near equatorial plane), radial velocity of the ELM pulse propagation in SOL is evaluated to be 0.8-1.8 km/s (approximately 1.4 km/s for least-mean-squared fitting). PMID:20441336

Suzuki, T; Oyama, N; Asakura, N

2010-04-01

165

STATISTICAL ACOUSTIC INDICATIONS COARTICULATION Katrin Kirchhoff Bilmes  

E-print Network

limited sets using acoustic­ phonetic methods formant analysis. propose a method statistically analyzes. that is indeed larger those phonetic conditions believed to possess more coarticulation. 1. INTRODUCTION Although a change acoustic­phonetic content of a speech segment due anticipation preservation adjacent segments

Kirchhoff, Katrin

166

The results of low-speed wind tunnel tests to investigate the effects of the NASA refan JT8D engine nacelles on the stability and control characteristics of the Boeing 727-200  

NASA Technical Reports Server (NTRS)

The results from two low-speed wind tunnel tests of the Boeing 727-200 airplane as configured with the NASA refan JT8D-109 turbofan engines are presented. The objective of these tests was to determine the effects of the refan installation on the low-speed stability and control characteristics of the 727 airplane. Four side nacelle locations were tested to insure that aerodynamic interactions of the nacelles and empennage would be optimized. The optimum location was judged to be the same as that of the production JT8D-9 engines; the current production engine mounts can be used for this location. Some small changes in the basic airplane characteristics are attributable to the refan nacelles. The flaps up longitudinal and lateral-directional stability are both slightly increased for low angles of attack and sideslip respectively. The longitudinal stability at stall is improved for both the flaps up and landing flap configurations. The high attitude characteristics of the basic airplane are not significantly altered by the refan nacelle installation. Directional control capability is not affected by the refan nacelles.

Shirkey, M. D.

1973-01-01

167

The results of a high-speed wind tunnel test to investigate the effects of the NASA refan JT8D engine nacelles on the stability and control characteristics of the Boeing 727 airplane  

NASA Technical Reports Server (NTRS)

A high speed wind tunnel test was conducted to investigate the effects of the NASA Refan JT8D engine nacelles on the stability and control characteristics of the Boeing 727 airplane. The test was performed at the Calspan Corporation 8x8 ft. (2.44x2.44 m.) transonic wind tunnel. Both the 727-200 and -100 models were tested. A small nose-down pitching moment increment and a slight increase in longitudinal stability were noted due to the Refan nacelles. The directional stability of the 727-200 airplane increased up to 10 percent. A smaller improvement was observed on the 727-100 model. In general, the high speed stability and control characteristics of the basic airplane are not significantly altered by the Refan nacelle installation.

Kupcis, E. A.

1973-01-01

168

The results of a low-speed wind tunnel test to investigate the effects of the Refan JT8D engine target thrust reverser on the stability and control characteristics of the Boeing 727-200 airplane  

NASA Technical Reports Server (NTRS)

The effects of the Refan JT8D side engine target thrust reverser on the stability and control characteristics of the Boeing 727-200 airplane were investigated using the Boeing-Vertol 20 x 20 ft Low-Speed Wind Tunnel. A powered model of the 727-200 was tested in groud effect in the landing configuration. The Refan target reverser configuration was evaluated relative to the basic production 727 airplane with its clamshell-deflector door thrust reverser design. The Refan configuration had slightly improved directional control characteristics relative to the basic airplane. Clocking the Refan thrust reversers 20 degrees outboard to direct the reverser flow away from the vertical tail, had little effect on directional control. However, clocking them 20 degrees inboard resulted in a complete loss of rudder effectiveness for speeds greater than 90 knots. Variations in Refan reverser lip/fence geometry had a minor effect on directional control.

Kupcis, E. A.

1974-01-01

169

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)

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.

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

2014-12-01

170

The emission rates of CH, CD and C2 spectral bands and a re-evaluation of the chemical sputtering yield of the JT-60U carbon divertor plates  

NASA Astrophysics Data System (ADS)

The CH photon emission rate, defined as the number of photons over a dissociation and/or ionization event of CH4, has been determined from the ratio of the measured emission intensity of the CH spectral band over the CH4 injection rate into the divertor plasma of JT-60U. Similar photon emission rates of CD for CD4, and CH and C2 for C2H4 and C2H6, have also been determined. Interestingly, the C2 spectral band intensity is found to increase during the CH4 and CD4 injection, suggesting that the injected CH4 reacts with the carbon divertor plates to form heavier hydrocarbons. Previously published chemical sputtering yields (Nakano et al 2002 Nucl. Fusion 42 689) evaluated with the photon efficiencies determined in PISCES-A (Pospieszczyk et al 1989 UCLA Report UCLA-PPG-1251) have been re-evaluated using the measured emission rates. By applying the photon emission data found here and taking into account the C2 emission process originating from CH4, the re-evaluated total chemical sputtering yield becomes lower (?7%) compared to the original in (Nakano et al 2002 Nucl. Fusion 42 689) (?8%), and the dependence on the incident ion flux and energy becomes weaker.

Nakano, T.; Higashijima, S.; Kubo, H.; Asakura, N.; Fukumoto, M.

2014-04-01

171

Gruppe 1 12:45 13:30 Franz Katrin  

E-print Network

14:25 ­ 15:10 Nicole Kathrin Dick Angela Simon Friedrich Melanie Sebastian Paul Hubmann Klein Andreas Mann Melanie Meier Niederländer Paul Franziska Franziska Schneider Schröder Michaela Tanja Sigrun Zwick

Keller, Gerhard

172

J.T. Anderson ,,10 Cusco, Peru  

E-print Network

is our host family. Names are from left to right: Lisa, Chibelli, and Sele #12;I traveled and worked giving vaccinations. The clinic was very informative to its patients on how to properly nurse the babies. There were only nurses in Ped's so in order to receive medications, the patient would have to go to her

173

JT/LJT connector insert material evaluation  

SciTech Connect

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.

Baca, J.R.F.

1991-10-01

174

JT90 thermal barrier coated vanes  

NASA Technical Reports Server (NTRS)

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.

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

1982-01-01

175

J. theor. Biol. (1998) 194, 491515 Article No. jt980771  

E-print Network

of their similarity. Because of neutrality, phenotypes denote equivalence classes of genotypes. The definition simulations. The statistical topology organizing the set of RNA shapes explains why neutral drift in sequence genetics views the course of evolution as a lineage of genotypes, while paleontology sees a lineage

Fontana, Walter

176

Miniature J-T refrigators using adsorption compressors  

NASA Technical Reports Server (NTRS)

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.

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

1982-01-01

177

J. theor. Biol. (1998) 193, 321334 Article No. jt980704  

E-print Network

tube germination. Pollen grains are produced by meiosis and aperture number definition appears to be linked with the partition that follows meiosis and leads to the formation of a tetrad of four haploid microspores. In dicotyledonous plants, meiosis is simultaneous which means that cytokinesis occurs once

178

Sorption J-T refrigeration utilizing manganese nitride chemisorption  

NASA Technical Reports Server (NTRS)

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.

Jones, Jack; Lund, Alan

1990-01-01

179

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

E-print Network

(EPSP) rising instantaneously to its peak value when a spike is received at the synapse, in contrast with real synapses, whose EPSPs have a finite rise time. Such EPSPs can be modelled using a first order

Brunel, Nicolas

180

Clean-up of graphite first walls in JT-60  

NASA Astrophysics Data System (ADS)

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 300C, 18 h glow discharge cleaning and 36 h Taylor-type discharge cleaning keeping the vessel temperature around 280C. 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.

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

1989-04-01

181

JSIS Course Numbers: Sorted by Joint Dept 3/31/2012 No. New Title Jt Dept1 Jt Dept2  

E-print Network

&POL VIOLENCE JSIS B 526 POLITICAL ISLAM ANTH 526 SIS 526 POLITICAL ISLAM JSIS A 531 SOCL MOVEMENT INDIA ANTH RELG/IDEN/CLTR PLRL ANTH 330 RELIG 330 RELG/IDEN/CLTR PLRL JSIS A 341 POL VIOLENCE S ASIA ANTH 341 SISA 341 POL VIOLENCE S ASIA JSIS B 356 BUDDHISM & SOCIETY ANTH 352 RELIG 350 BUDDHISM & SOCIETY JSIS A 370

Borenstein, Elhanan

182

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

E-print Network

Kinosita, Jr.,*, Masasuke Yoshida,*, §,1 and Siegfried Engelbrecht *CREST team13 (Core Research Bacillus PS3 (Noji, H., Ya- suda, R., Yoshida, M., and Kinosita, K., Jr. (1997) Na- ture 386, 299­302), we observed ATP-driven rotation of a fluorescent actin filament attached to the subunit in Escherichia coli F1

Junge, Wolfgang

183

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

PubMed

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

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

2013-01-01

184

Predicting Mothers Reports of Childrens Mental Health Three Years after Hurricane Katrin  

PubMed Central

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 childrens 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

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

2012-01-01

185

HIDDEN AND NOT-SO-HIDDEN MARKOV MODELS: IMPLICATIONS FOR ENVIRONMENTAL DATA ANALYSIS  

E-print Network

chain are observed · Definition of HMM (or not-so HMM) -- {Jt : t = 1, 2, . . .} first-order Markov for precipitation -- Jt daily precipitation occurrence Two-state, first-order Markov chain, Corr(Jt , Jt+1) > 0 Jt = 1 denotes occurrence (Jt = 0 otherwise) -- Xt daily precipitation amount Xt = 0 if Jt = 0 (Xt > 0

Katz, Richard

186

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

E-print Network

of Washington automatic speech recognition (ASR) system for the 2001 DARPA SPeech In Noisy Environments (SPINE created in order to evaluate these techniques. The DARPA SPINE task is one such database that provides normalization, which are an attempt to com­ pensate for what are typically minimal differences in channel ef

Bilmes, Jeff

187

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

E-print Network

modes in ICRF­heated plasmas in JT­60U by using the global kinetic, magnetohydrodynamic (MHD) stability electron density n e (0) = 2:8 \\Theta 10 13 cm \\Gamma3 , the 2 #12; electron temperature T e (0) = 6:2ke)(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

188

Transient Heat Transport in Subcooled He II Associated with JT Effect  

Microsoft Academic Search

Transient heat transport in subcooled He II has been investigated in a 1 m long rectangular channel with distributed contractions: one-closed end has a heater, while the other end is open to the He II bath. Experiments were conducted applying heat pulses and recording the temperature profile with seven Allan Bradley resistors placed along the channel. Cernox sensor was indium

R. Maekawa; A. Iwamoto; S. Hamaguchi

2004-01-01

189

In memoriam Prof. Dr J.T. Wiebes (1931-1999), evolutionary biologist and systematic entomologist  

Microsoft Academic Search

Born on 13 September 1931 in Rotterdam, Jacobus Theodorus [Koos] Wiebes read biology at Leiden University where he obtained his Ph.D. in 1963 on studies of Indo-Australian fig wasps. He started working on spiders (Lycosidae, Pisauridae) and beetles (Carabidae, Cetoniidae, Helodidae), but he earned his scientific reputation as a specialist in fig wasps (Hymenoptera: Agaonidae, Torymidae), their parasitoids and intricate

Bruggen van A. C; Achterberg van C

2000-01-01

190

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

SciTech Connect

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.

Paugh, R.L.

1989-09-15

191

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

SciTech Connect

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.

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

1986-08-15

192

Radiation processes of impurities in detached divertor plasmas of JT-60U  

E-print Network

) · Spatial resolution: ~ 1 cm Optical fiber (200 µm) ~ 200 m 32ch 60ch Spectrometer · Grating :300 g!1x1020 m-3 #12;Te ( eV )ne Attached Highly-radiative, low-temperature and high- density plasma around the X-point · 2D radiation image Previous results · 2D parameter distribution Calculated by SOLDOR

Princeton Plasma Physics Laboratory

193

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 a consortia of operators and service companies conducted an extensive hydraulic fracture imaging demonstration

194

Photon bubbles in ultra-cold matter J.T. Mendonca1,  

E-print Network

in the de- velopment of fundamental laws of quantum physics start- ing with the Bohr model for the atomic for the cold atom gas. A perturbative analysis shows the occurrence of two different regimes with either in astrophysics. PACS numbers: 37.10.Vz, 42.50.Nn, 52.35.Hr,95.30.Jx Atomic physics has played an important role

Kaiser, Robin

195

&.)&&? i?J*.-i . ' ^ -> . ^Jt-'iVr-v It--Mtt< 1  

E-print Network

to Burlin's general cavity theory. The calculations are made by using tabulated values for stopping powers DOSIMETRY; PHOTONS; STOPPING POWER; X-RAY DOSIMETRY. Risø National Laboratory, DK 4000 Roskilde, Denmark May. GENERAL DESCRIPTION OF PROGRAM PARTS 5 2.1 Stopping Power Program 5 2.2 Energy Absorption Coefficient

196

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

NASA Technical Reports Server (NTRS)

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.

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

1996-01-01

197

Recent Progress of the Design Activity for the Poloidal Field Coil System in JT-60SA  

Microsoft Academic Search

PA (procurement arrangement) for poloidal field (PF) coil system, which consists of the central solenoid (CS) and the equilibrium field (EF) coils, was agreed between Japan and EU. During this activity, design of PF coils system was continued to be modified. For CS, material for the jacket of this conductor was changed into stainless steel (316LN) to make providing easier.

K. Tsuchiya; K. Kizu; H. Murakami; S. Asakawa; M. Kuramochi; K. Yoshida; V. Tomarchio

2010-01-01

198

Development of jt Coolers Operating at Cryogenic Temperatures with Nonflammable Mixed Refrigerants  

NASA Astrophysics Data System (ADS)

Throttle cycle coolers, operating with mixed refrigerants have been already used at refrigeration temperatures down to 70 K. An industrial single-stage, oil lubricated compressor can be used to provide both, a relatively low cost and long operational time. Application of nonflammable mixed refrigerants is important for safety, transportation, service and maintenance. However, it is more difficult to provide a required refrigeration performance and long-term reliability due to properties of nonflammable components. The paper presents experimental and modeling data for single-stage coolers operating in a temperature range of 80 to 150 K. The nonflammable components were selected to develop mixed refrigerants for the desired temperature ranges. A gas refrigerant supply technology is used for a single-stage cooler design. The minimal achievable temperature is restricted by the freezing point of the mixture. Selected gas refrigerant technology restricts the maximal refrigeration capacity. However, it allows a compromise between stable, long-term reliable operation and simplicity of equipment design. Stability of operation of small-scale, highly reliable coolers has been proven by the data accumulated over more than one year of testing.

Khatri, A.; Boiarski, M.

2008-03-01

199

The shapes of a suspended curly hair J.T. Miller1  

E-print Network

shapes set by the coupled effects of elasticity, natural curvature, nonlinear geometry, and gravity elasticity and nonlinear geometry. In the absence of natural curvature, the nonlinear equilib- rium equations require the external load to be highly symmetric. We have recently found that natural curvature can

Audoly, Basile

200

BIBLIOGRAPHY [AFL] Accardi, L., Frigerio, A., Lewis, J.T., Quantum stochastic processes, Publ. RIMS 18  

E-print Network

-crossing partitions, preprint, Washington 1991. [Eva] Evans, D.E., On On , Publ. RIMS 16 (1980), 915{927. [ESh] Ezaki., Advanced Combinatorics, D. Reidel Publishing Company, Dordrecht, 1974. [CH] Cushen, C.D., Hudson, R

Speicher, Roland

201

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

NASA Technical Reports Server (NTRS)

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

1975-01-01

202

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

NASA Technical Reports Server (NTRS)

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.

Stromberg, W. J.

1981-01-01

203

COMBINATION AND JOINT TRAINING OF ACOUSTIC CLASSIFIERS FOR SPEECH RECOGNITION  

E-print Network

COMBINATION AND JOINT TRAINING OF ACOUSTIC CLASSIFIERS FOR SPEECH RECOGNITION Katrin Kirchhoff 352500, Seattle, WA, USA katrin,bilmes @ssli.ee.washington.edu ABSTRACT Classifier combination classifier combination in speech recognition systems. We present new techniques that generalize previously

Bilmes, Jeff

204

HIDDEN AND NOT-SO-HIDDEN MARKOV MODELS: IMPLICATIONS FOR ENVIRONMENTAL DATA ANALYSIS  

E-print Network

Markov models might be beneficial #12;(2) General Modeling Framework · Definition of HMM (or not-so HMM · Example: Chain-dependent process for precipitation -- Jt daily precipitation occurrence Two-state, first-order Markov chain, Corr(Jt , Jt+1) > 0 Jt = 1 denotes occurrence (Jt = 0 otherwise) -- Xt daily precipitation

Katz, Richard

205

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)

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.

1973-01-01

206

Models of Collaborative Visualization Ken Brodlie, School of Computing, University of Leeds, Leeds LS2 9JT, UK  

E-print Network

planning. It only makes sense for highly critical applications, such as space missions. Yet teamwork geoinformation technologies) are designed for individual use." This chapter is intended as a contribution towards, but radical collocation is not really appropriate because the period of collaborative analysis is typically

Brodlie, Ken

207

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

Federal Register 2010, 2011, 2012, 2013

...result in uncontained engine debris and damage...Tinidur material, and installation of crushable sleeve...would affect 1,143 engines installed on airplanes...substantial direct effect on the States...Criteria for All Engine Models Listed in...Crushable Sleeve Spacer Installation (q) At next...

2010-07-01

208

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

Federal Register 2010, 2011, 2012, 2013

...models, and were operating in hot environments. Higher operating metal [[Page 41145...life debit for each operating cycle, requiring...the same fleet and engine model. This condition...that have more than 4,500...

2011-07-13

209

EPTCS ??, 20??, pp. 123, doi:10.4204/EPTCS.??.?? cc A. Stefanek, R.A. Hayden, J.T. Bradley  

E-print Network

of ordinary differential equations (ODEs), this method of performance analysis is far more scalable than of the error in the differential equation approximations in [1]. We use our new GPA tool, to explore stochastic simulation. The GPA tool is the first to produce higher moment analysis from differential equation

Imperial College, London

210

Low speed wind tunnel flow field results for JT8D refan engines on the Boeing 727-200  

NASA Technical Reports Server (NTRS)

Low speed flow angularity results are presented showing flow direction at the nacelle locations on the Boeing 727-200. Flow angle probes (yawheads) were used for measurements at side and center inlet positions on the aft fuselage. A range of flap settings were tested with flap angles of 0 deg, 15 deg, and 40 deg selected for investigation.

Easterbrook, W. G.; Roberts, W. H.

1974-01-01

211

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

Federal Register 2010, 2011, 2012, 2013

...Dargin, Aerospace Engineer, Engine Certification Office, FAA, Engine and Propeller Directorate...this proposed AD. Using the search function of the Web site...TLS of the manufacturer's engine manual for these engines...

2010-08-18

212

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

Federal Register 2010, 2011, 2012, 2013

...installed. That AD currently requires cleaning the front compressor front hubs (fan hubs), initial and repetitive eddy current (ECI) and fluorescent penetrant inspections (FPI) of tierod and counterweight holes for cracks, removal of...

2010-03-18

213

Grant Lythe CV Grant Lythe Department of Applied Mathematics, University of Leeds LS29JT, U.K.  

E-print Network

.maths.leeds.ac.uk/applied/INDOMATH · Stochastic modelling of T cell responses: chemical skin Krishnan (Skin Sensitization) · Mart´in L´o pez Garc´ia · Edgar Delgado-Eckert Research students: · Marco and Infectious Diseases. Santa Fe, NM, USA. 11 Jan 2014 · Stochastic modelling of T cell homeostasis Modelling

Lythe, Grant

214

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

E-print Network

) is most important issue for steady-state operation. Divertor plays an important role in protecting firstHe Divertor plasma Detachment, in-out asymmetry, impurity shielding, ELM heat load etc. Divertor geometry He changes Fueling puff,pellet Long discharge Detachment/ MARFE control Neutral/ Impurity shielding Core

Princeton Plasma Physics Laboratory

215

thethe VVocalocal JJoystickoystick A Human-Computer Interface for Individuals with Motor Impairments  

E-print Network

, Kelley Kilanski, Richard Wright, Katrin Kirchhoff, Amarnag Subramanya, Susumu Harada, James A. Landay Would do better given more training time Applications Broader Impact Natural languages can be quite

Bilmes, Jeff

216

Nutrient Management Advisory Board ~Approved ~  

E-print Network

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

Guiltinan, Mark

217

Nutrient Management Advisory Board ~ Approved ~  

E-print Network

Hawthorne, Agriculture Lender Representative Katrine Parmley-Gates, Feed Industry Representative Dean Producer Representative Chris Hoffman, Swine Producer Representative Bob Mikesell, representing Ken Kephart

Guiltinan, Mark

218

BioMed Central Page 1 of 13  

E-print Network

Email: Amer Al-Jawabreh - islahjr@yahoo.com; Stephanie Diezmann - sd21@duke.edu; Michaela Müller Strelkova - mstrelkova@mail.ru; Dmitri A Kovalenko - kovdmi@yahoo.com; Shavkat A Razakov - isaevins2@yahoo.com; Jan Schwenkenbecher - janschwenkenbecher@yahoo.de; Katrin Kuhls - katrin.kuhls@charite.de; Gabriele

Wirth, Thierry

219

Submodular Feature Selection for High-Dimensional Acoustic Score Space Yuzong Liu1, Kai Wei1, Katrin Kirchhoff1,2, Yisong Song2, Jeff Bilmes1,2  

E-print Network

event classification, acoustic- phonetic classification, segmental minimum Bayes risk decoding with highest mutual information between feature and phonetic class · Task 2: Graph-based SSL for phone segment

Noble, William Stafford

220

Source : Philippe Poirrier, Culture populaire et politique culturelle en France : un rendez-vous manqu ? dans Thomas ANTONIETTI, Bruno MEIER et Katrin RIEDER (dir.), Retour vers le prsent. La culture populaire en Suisse, Baden,  

E-print Network

Source : Philippe Poirrier, « Culture populaire et politique culturelle en France : un rendez culture populaire en Suisse, Baden, Hier+jetzt, Verlag für Kultur und Geschichte, 2008, p. 176-183. Culture populaire et politique culturelle en France : un rendez-vous manqué ? Comment la politique

Paris-Sud XI, Université de

221

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

222

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

E-print Network

reciprocal altruism based on alternating moves of the individuals has been observed include baboons (Packer, 1977; Trivers, 1971) and vampire bats (Wilkinson, 1984). In the former case two young male baboons

Hauert, Christoph

223

J. theor. Biol. (1997) 188, 110 00225193/97/170001 + 10 $25.00/0/jt970439 7 1997 Academic Press Limited  

E-print Network

) is usually analysed by evaluating arithmetic mean pay-offs in an ESS analysis. We consider several points arithmetic mean, the variance of its pay-off is also larger when the expected iterations of the game

Stephens, David W.

224

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

E-print Network

-immune hemolytic anemia are performed and compared with experimental data. 7 1998 Academic Press Limited 1; Umemura et al., 1986; Yamauchi & Ide, 1992) and autoimmune hemolytic anemia (Gordon & Varadi, 1962; Orr et observations in an induced autoimmune hemolytic anemia (Be´ lair et al., 1995). However, this model was less

225

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

E-print Network

demonstrate the existence of travelling wave solutions connecting the normal tissue and tumour steady states tumour angiogenesis, growth rate, connective tissue for- mation and dissolution, and the killing with normal tissue cells initially present, and may also recruit other cell types including lymphatic

Sherratt, Jonathan A.

226

J. theor. Biol. (1997) 185, 1529 00225193/97/050015 + 15 $25.00/0/jt960253 7 1997 Academic Press Limited  

E-print Network

that can be informally described as follows: choose an optimal mix of drugs at each point in time in order September 1996) Motivated by the inability of current drug treatment to provide long-term benefit to HIV fashion in order to minimize the total viral load. Our initial numerical results suggest that dynamic

Nowak, Martin A.

227

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

Federal Register 2010, 2011, 2012, 2013

...Dargin, Aerospace Engineer, Engine Certification Office, FAA, Engine and Propeller Directorate...this proposed AD. Using the search function of the Web site...TLS of the manufacturer's engine manual for these engines...

2010-08-18

228

J. theor. Biol. (1997) 184, 3139 00225193/97/010031 + 09 $25.00/0/jt960241 7 1997 Academic Press Limited  

E-print Network

, poor sources attract declining numbers of bees and eventually ``die out''. Certain pattern forming in genetics, learning and development. These ideas are applied to a model of honey bee foraging. This example & Green, 1991). Honey bee colonies use a trial and error learning method for discovery and exploitation

Frank, Steven A.

229

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

Federal Register 2010, 2011, 2012, 2013

...Hub (Disk), 1st Stage Compressor: * Hub Detail--All P...04, -05, -06 2nd Stage Compressor: Disk--All P/Ns...02, -03 Disk, 13th Stage Compressor-- 72-36-47 -02 All...Stage w/ 72-52-04 -03 integral Shaft--All...

2011-01-28

230

J. theor. Biol. (1997) 185, 379388 00225193/97/070379 + 10 $25.00/0/jt960317 7 1997 Academic Press Limited  

E-print Network

Protein Synthesis in the Ruminant Mammary Gland J. FRANCE*, M. D. HANIGAN, B. J. BEQUETTE, J. A. METCALF synthesis in the mammary gland of the lactating ruminant. 7 1997 Academic Press Limited 1. Introduction for protein synthesis in the mammary gland (Backwell, 1994; Metcalf et al., 1994). The ability of the mammary

Bequette, Brian J.

231

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

E-print Network

William Crookes a indiqué qu'il avait observé, dès 1872, certains mouvements des feuilles d'or dans le des figures). A noter que, quand ces expériences ont été décrites devant la Société royale, sir

Boyer, Edmond

232

DOI: 10.1126/science.1200815 , 1309 (2011);331Science  

E-print Network

-Dimensional Turing Patterns Tomography of Reaction-Diffusion Microemulsions Reveals This copy is for your personal as a result of a polar J-T distortion to counteract anti- aromaticity. The polar J-T distortion is induced

Epstein, Irving R.

233

UFR Sciences et Techniques Master Mtiers de l' enseignement sciences de la vie et de la terre -semestres 3 et 4 MCC 2013-2014 C. Cont session 2 O/N C. Cont  

E-print Network

pédagogie et didactique 3 Audrey CLERC UE 6 JT9YCVSG Stage responsabilité alternance Audrey CLERC UE 3 67 100% oral/écrit N JT9YCVDI Pédagogie Didactique 3 Audrey CLERC ELC 3 67 3 42 0 100% oral/écrit N JT0 UT 3 TOU 0 10 5 100% oral/écrit N JT0CVW1 Stage responsabilités - Pédagogie - didactique 4 Audrey

Jeanjean, Louis

234

77 FR 10406 - Airworthiness Directives; The Boeing Company Airplanes  

Federal Register 2010, 2011, 2012, 2013

...carrying capability and all airplanes powered by Pratt & Whitney JT9D series engines...the deactivation pins on all airplanes powered by Pratt & Whitney JT9D series engines...Model 767-200 and -300 series airplanes powered by Pratt & Whitney JT9D series...

2012-02-22

235

77 FR 41895 - Airworthiness Directives; The Boeing Company Airplanes  

Federal Register 2010, 2011, 2012, 2013

...the deactivation pins on all airplanes powered by Pratt & Whitney JT9D series engines...carrying capability and all airplanes powered by Pratt & Whitney JT9D series engines...the deactivation pins on all airplanes powered by Pratt & Whitney JT9D series...

2012-07-17

236

Probing the absolute mass scale of neutrinos  

E-print Network

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 ...

Formaggio, Joseph A.

237

NUTRIENT MANAGEMENT ADVISORY BOARD BOARD MEMBERS  

E-print Network

. COLLAMER GROWMARK FS HANOVER, PA 17331 Term: July 1, 2010 - June 30, 2013 LIVESTOCK (SWINE) PRODUCER REP Term: July 1, 2011 - June 30, 2014 FEED INDUSTRY REPRESENTATIVE KATRINE L. S. PARMLEY-GATES CUMBERLAND

Guiltinan, Mark

238

Nutrient Management Advisory Board ~ Approved ~  

E-print Network

and Advisors were present: Members: Chris Hoffman, Swine Producer Representative James Junkin, Meat Poultry Katrine Parmley-Gates, Feed Industry Representative Bob Bastian, Non-Farmer Citizen Representative John

Guiltinan, Mark

239

Wed 20th March Methodist Hall  

E-print Network

Skoruppa, Silvia Benavides- Varelaa, Caroline Floccia, Laurence White, Ian Howard Lunch S7: Transtechnology Blassnig Fri 22nd March Methodist Hall S6: Developments in infant speech perception 10.00 ­ 12.00 Katrin

Miranda, Eduardo Reck

240

Zrich, den 22. Dezember 2005 Bildungsdirektion  

E-print Network

-Katrin, aus/in Deutschland ,,Landnutzung in Baden-Württemberg als Einflussfaktor auf die Echinococcus multilocularis-Prävalenz bei Rotfüchsen" Zürich, den 22. Dezember 2005 Der Dekan: U. Hübscher #12

Zürich, Universität

241

COMBINATION AND JOINT TRAINING OF ACOUSTIC CLASSIFIERS FOR SPEECH RECOGNITION  

E-print Network

COMBINATION AND JOINT TRAINING OF ACOUSTIC CLASSIFIERS FOR SPEECH RECOGNITION Katrin Kirchhoff 352500, Seattle, WA, USA fkatrin,bilmesg@ssli.ee.washington.edu ABSTRACT Classifier combination classifier combination in speech recognition systems. We present new techniques that generalize previously

Bilmes, Jeff

242

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

Multiple Choice Questions (MCQs) is important, as it has implications not just for your GPA, but for future-written MCQ will be clearly worded and avoid giving clues to the best answer. Why Are MCQs So Challenging? Many students believe MCQs are more challenging than essay or short answer questions for the following

Boonstra, Rudy

243

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

PubMed Central

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

2010-01-01

244

The five-jump test for distance as a field test to assess lower limb explosive power in soccer players.  

PubMed

The 5-jump test (5JT) was proposed to evaluate lower limb explosive power of athletes competing in various disciplines. Although 5JT performance is usually expressed in absolute terms as the overall distance covered (i.e., in meters), subject size can play a significant role in the performance. The aims of the present study were to test the relationship of 5JT absolute performance with laboratory tests for explosive power and to develop performance notations useful to improve the diagnostic value of 5JT. Fifteen elite soccer players, members of the Under-23 Tunisian national team, were tested for 5JT, force platform vertical jumping (squat jump [SJ] and arm-aided countermovement jump [Arm-CMJ]), and concentric isokinetic leg extension/flexion (90 degrees x s(-1) and 240 degrees x s(-1)). 5JT performance was expressed in absolute terms (meters), relative to leg length (5JT-relative) and with body mass-dependent notations (Body mass x 5JT, 5JT-body mass). 5JT performance was significantly correlated with SJ height and scaled (W x kg) peak power (0.72 and 0.77, respectively, p < 0.01). 5JT-relative values were significantly related to SJ and Arm-CMJ height (0.61 and 0.71, respectively, p < 0.05) and scaled peak power (0.57 and 0.59, respectively, p < 0.05). 5JT-body mass revealed significantly related of SJ (0.82, p < 0.0001) and Arm-CMJ peak power (0.54, p < 0.05) and to SJ and Arm-CMJ peak force (0.67 and 0.65, respectively p < 0.05). 5JT-relative and 5JT-body mass correlated significantly with knee extensors 240 degrees x s(-1) (0.60, p < 0.05) and knee flexors 90 degrees x s(-1) (0.67, p < 0.01) isokinetic acceleration time, respectively. The results of this study suggest that the 5JT may be regarded as an explosive strength diagnostic tool under field conditions in elite soccer players. The use of performance notation accounting for body size differences may improve the diagnostic ability of 5JT. PMID:18438217

Chamari, Karim; Chaouachi, Anis; Hambli, Mourad; Kaouech, Fethi; Wislff, Ulrik; Castagna, Carlo

2008-05-01

245

75 FR 3150 - Airworthiness Directives; The Boeing Company Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747...  

Federal Register 2010, 2011, 2012, 2013

...or Equipped With Pratt & Whitney JT9D-3 or -7 (Excluding -70) Series Engines AGENCY: Federal Aviation Administration (FAA...or equipped with Pratt & Whitney JT9D-3 or -7 (excluding -70) series engines, as identified in Boeing Alert Service...

2010-01-20

246

14 CFR 36.1 - Applicability and definitions.  

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

2014-01-01

247

14 CFR 36.1 - Applicability and definitions.  

Code of Federal Regulations, 2012 CFR

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

2012-01-01

248

14 CFR 36.1 - Applicability and definitions.  

Code of Federal Regulations, 2013 CFR

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

2013-01-01

249

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

PubMed

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

Jurez-Rodrguez, Mara Dolores; Torres-Escobar, Ascencin; Demuth, Donald R

2013-05-01

250

Maxwell Curriculum vitae 1 Curriculum Vitae  

E-print Network

­8452. 2013 J.T. Maxwell, Knapp, P.A., and Ortegren, J.T. Influence of the Atlantic Multidecadal Oscillation in the southeastern Atlantic United States: 1950­2008. Annals of the Association of American Geographers 102 (2): 259

Roy Chowdhury, Rinku

251

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

PubMed Central

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

Jurez-Rodrguez, Mara Dolores; Torres-Escobar, Ascencin; Demuth, Donald R.

2013-01-01

252

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

NASA Astrophysics Data System (ADS)

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

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

2001-07-01

253

The Vocal Joystick: A Voice-Based Human-Computer Interface for Individuals with Motor Impairments  

E-print Network

Jeff A. Bilmes , Xiao Li , Jonathan Malkin , Kelley Kilanski , Richard Wright , Katrin Kirchhoff control tasks. Natural spoken language is often regarded as the obvious choice for a human-computer inter after a short initial trial period. In addition, natural speech is optimal for communication between

Bilmes, Jeff

254

The Vocal Joystick: A Voice-Based Human-Computer Interface for Individuals with Motor Impairments  

E-print Network

Jeff A. Bilmes, Xiao Li, Jonathan Malkin, Kelley Kilanski, Richard Wright, Katrin Kirchhoff, Amarnag tasks. Natural spoken language is often regarded as the obvi- ous choice for a human-computer interface, dialects, etc. In addi- tion, natural speech is optimal for communication be- tween humans but sub

Bilmes, Jeff

255

Proceedings of Human Language Technology Conference and Conference on Empirical Methods in Natural Language Processing (HLT/EMNLP), pages 9951002, Vancouver, October 2005. c 2005 Association for Computational Linguistics  

E-print Network

Impairments Jeff A. Bilmes , Xiao Li , Jonathan Malkin , Kelley Kilanski , Richard Wright , Katrin KirchhoffProceedings of Human Language Technology Conference and Conference on Empirical Methods in Natural control tasks. Natural spoken language is often regarded as the obvious choice for a human-computer inter

256

Lunch Seminar Cyber Warfare  

E-print Network

Lunch Seminar Cyber Warfare Seminar on cyber warfare with Katrin Nyman Metcalf, Professor and Head of a concerted cyber attack from a hostile state. The attack lead to a number of international measures, like the creation of the NATO Cooperative Cyber Defence Centre of Excellence. While efforts are made to estimate

Uppsala Universitet

257

RESEARCH Open Access Rapid selection and identification of Miscanthus  

E-print Network

RESEARCH Open Access Rapid selection and identification of Miscanthus genotypes with enhanced , Charles E Wyman1,2 , Katrin Jakob3 and Bin Yang1,4* Abstract Background: Because many Miscanthus genotypes can be cultivated with relatively high productivity and carbohydrate content, Miscanthus has great

California at Riverside, University of

258

ORIGINAL ARTICLE Serum oxylipin profiles in IgA nephropathy patients reflect kidney  

E-print Network

alterations Angela M. Zivkovic · Jun Yang · Katrin Georgi · Christine Hegedus · Malin L. Nording · Aifric O Institute, Food Science & Technology Department, and Entomology Department, University of California, Davis of Entomology, University of California, Davis, CA, USA A. O'Sullivan Foods for Health Institute, University

Hammock, Bruce D.

259

University of Freiburg Public Relations  

E-print Network

Hübner Katrin Albaum Freiburg, xx.xx.xxxx University of Freiburg . 79085 Freiburg . Germany Press Release in a 7-Tesla magnetic resonance scanner at the University of Magdeburg. These machines produce a magnetic produces a much more detailed image of structures in the human body. Only a few of these devices

260

Please cite this article in press as: K. Lunze, et al., Blood glucose control algorithms for type 1 diabetic patients: A methodological review, Biomed. Signal Process. Control (2012), http://dx.doi.org/10.1016/j.bspc.2012.09.003  

E-print Network

diabetic patients: A methodological review, Biomed. Signal Process. Control (2012), http://dx.doi.org/10 diabetic patients: A methodological review Katrin Lunzea, , Tarunraj Singhb , Marian Waltera , Mathias D 14260, USA c University Hospital Dresden, Endowed Professorship for Regenerative Therapies in Diabetes

Singh, Tarunraj

261

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...

262

Isolation, Characterization, and Pericycle-Specific Transcriptome Analyses of the Novel Maize Lateral  

E-print Network

, and the cell cycle. This analysis defines an array of genes that is active before lateral root initiationIsolation, Characterization, and Pericycle-Specific Transcriptome Analyses of the Novel Maize Lateral and Seminal Root Initiation Mutant rum11[w] Katrin Woll, Lisa A. Borsuk, Harald Stransky, Dan

Schnable, Patrick S.

263

universit y of al ask a museum of the north  

E-print Network

* Daniel Gibson, Collection Manager Brina Kessel, Curator Emeritus Christy Pruett, Research Associate Armbruster Sarah Fowell Gary Laursen Robert Lipkin Cynthia R. Meyers Barbara Murray Carl Roland Leslie A Klistoff Katrin Simon Candice Smith, B.A.+ exhibition & Design Jessica Wilcox, B.A.+ Jonah Wright herbarium

Ickert-Bond, Steffi

264

Nutrient Management Advisory Board ~Approved ~  

E-print Network

Representative Jim Brubaker, Meat Poultry Representative Bruce Lindsey, Hydrology Representative Katrine Parmley Representative Advisors: Rob Davidson, PDA Mike Lovegreen, PACD Steve Lehman, Manure Hauling Industry Doug Beegle Davidson provided a list of recommended editorial (non-substantive) changes for the group to consider

Kaye, Jason P.

265

Research Report: The Internationalisation of English Social Work --  

E-print Network

Research Report: The Internationalisation of English Social Work -- The migration of German social work practitioners and ideas to England Dr Katrin Bain Prof Tony Evans Contact Professor Tony Evans Department of Social Work Royal Holloway University of London Egham, Surrey, TW20 0EX Tony

Sheldon, Nathan D.

266

Emerging Consequences of Financing Private Colleges with Public Money  

ERIC Educational Resources Information Center

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)

Smith, Michael R.

1975-01-01

267

Suppression of magnetization ripple by exchange bias M. Ali,* C. H. Marrows, and B. J. Hickey  

E-print Network

School of Physics and Astronomy, E. C. Stoner Laboratory, University of Leeds, Leeds LS2 9JT, United involve domains within the AF layer, have shown to be most promising. Mauri et al.10 extended the idea

Kuch, Wolfgang

268

Examination of climate risk using a modified uncertainty matrix framework--Applications in the water sector  

E-print Network

, University of Leeds, Leeds, LS2 9JT, UK f Climate Change Impacts, Adaptation and Mitigation (CC-IAM) Research climate change could challenge current freshwater management practices (e.g., Wei et al., 2011), and has

Fowler, Hayley

269

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, ...

270

Open to Suggestion.  

ERIC Educational Resources Information Center

Contains information on a vocabulary game for the content areas; maintaining teacher morale through weekly team meetings; using the typewriter in an adult literacy program; and rewarding completed performance contracts with free books. (JT)

Journal of Reading, 1980

1980-01-01

271

Are Manual Typewriters Becoming Obsolete?  

ERIC Educational Resources Information Center

A University of Akron survey of the Akron area revealed that the general trend is for large companies to use manual typewriters in their business offices. Implications for typewriting instruction are discussed. (JT)

Johnston, Jean

1976-01-01

272

Design for a Training Centre  

ERIC Educational Resources Information Center

Briefly describes the design for Cantrakon (Canadian Training and Conference Centre) being built for $8 million by Mont Ste-Marie Ltd. to provide first-class conference facilities to attract Canadian government and industry and also international conferences. (JT)

Canadian Training Methods, 1976

1976-01-01

273

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, ...

274

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: ...

275

POINT OF VIEW Let's Not Fight Over ITER, by Hiroshi Hirabayashi  

E-print Network

would like to present the opposite point of view to you, about which the French press did not speak, the British JET and the American TFTR. Among them, the JT-60 and the JET both reached, the essential objective

276

Contracting for Professional Development in Academe  

ERIC Educational Resources Information Center

Outlines strategy by which university department chairpersons, by clearly stating their expectations for faculty performance and by understanding the faculty members' personal professional goals, can organize support for professional development in teaching along with organizational development. (JT)

Buhl, Lance C.; Greenfield, Adele

1975-01-01

277

Neuromuscular Disease Descriptions  

MedlinePLUS

... current news articles and other content on the MDA website relating to each disease. Muscular dystrophies (involving ... others have high intelligence, such as the late MDA National Goodwill Ambassador Mattie J.T. Stepanek, who ...

278

Tile Drainage  

E-print Network

..................... pre 14-- Tile D with C: Wheels ....... ....... pre 15-Tile R ........................ gure 16-laying llJt: ""ith TiIe Hook Machine ........ bitching look ... .. w:1n - gure 17-Concrete Outlc [Blank Page in Original Bulletin] TILE DRAINAGE...

Leidigh, A.H.; Gee, E.C.

1916-01-01

279

Writing Away from Fear: Mina Shaughnessy and the Uses of Authority.  

ERIC Educational Resources Information Center

Responds to John Rouse's attack on Mina Shaughnessy's teaching strategies for composition instruction (see EJ 209 264). Offers personal experiences to illustrate the role of the basic writing teacher and the uses of authority in the basic writing classroom. (JT)

Allen, Michael

1980-01-01

280

The Politics of Composition: A Reply to John Rouse.  

ERIC Educational Resources Information Center

Responds to an essay on "the politics of composition" by John Rouse (see EJ 209 264), who interpreted Mina Shaughnessy's teaching strategies as being political conditioning and suppressing student freedoms. Defends Shaughnessy's methods while seeking to refute Rouse's argument. (JT)

Graff, Gerald

1980-01-01

281

Innovative Programs and Curricula  

ERIC Educational Resources Information Center

A summary of curricular innovations (career education, experiential education, competency-based education, interdisciplinary courses, independent study, calendar change) with discussion of reasons for resistance (poor quality, intellectual work involved, lack of concept of "curriculum"). (JT)

Martin, Edwin P.

1975-01-01

282

Wednesday, February 4, 2004 Search Archives  

E-print Network

Subscribe About us Contact us Privacy Policy Advertise Nifco Shukan ST JT Weekly Travel Service Travel and arts from Japan delivered to you! now!Subscribe Cartoons ! 2/4/04 11:10 AMThe Japan Times Online Page 1

283

Saturday, January 24, 2004 Search Archives  

E-print Network

Subscribe About us Contact us Privacy Policy Advertise Nifco Shukan ST JT Weekly Travel Service Travel and arts from Japan delivered to you! now!Subscribe Cartoons ! 1/23/04 9:09 PMThe Japan Times Online Page 1

284

Cool's Clams Casino  

ERIC Educational Resources Information Center

A mathematical game that reinforces basic multiplication facts, strengthens concepts of factors and multiples, and also provides arithmetic drill is described. Four variations of the game are also provided. (JT)

Cobey, Paul; Williams, David E.

1977-01-01

285

Localization of response functions of spiral waves in the FitzHughNagumo system  

E-print Network

of Liverpool, Liverpool L69 7ZL, UK 2 School of Biological Sciences, University of Leeds, Leeds LS2 9JT 3 Department of Mathematical Sciences, University of Liverpool, Liverpool L69 7ZL, UK # Author to whom

Biktashev, Vadim N.

286

Localization of response functions of spiral waves in the FitzHugh-Nagumo system  

E-print Network

of Liverpool, Liverpool L69 7ZL, UK 2 School of Biological Sciences, University of Leeds, Leeds LS2 9JT 3 Department of Mathematical Sciences, University of Liverpool, Liverpool L69 7ZL, UK Author to whom

Biktashev, Vadim N.

287

Detunable Transverse Electromagnetic (TEM) Volume Coil for High-Field NMR  

E-print Network

Detunable Transverse Electromagnetic (TEM) Volume Coil for High-Field NMR J.T. Vaughan,* G. Adriany. To solve this problem for neuroimaging applications, actively detunable transverse electromagnetic (TEM

Duong, Timothy Q.

288

EJ Workshop.  

ERIC Educational Resources Information Center

Contains suggestions for improving writing instruction and stimulating student interest in writing. Suggests contest writing, using the poem "Jabberwocky" for vocabulary development, and an activity for structuring creative thinking. (JT)

Gnagy, Susan; And Others

1980-01-01

289

SPECIAL SECTION doi:10.1111/evo.12107  

E-print Network

Centre for Biodiversity, Clayton Campus, Monash University, Wellington Road, Clayton, Victoria 3800's Buildings, West Mains Road, Edinburgh EH9 3JT, Scotland Received June 30, 2012 Accepted March 4, 2013 Data

Keogh, Scott

290

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

E-print Network

with measurements of the alpha distribution function made with a sensitive active neutral particle diagnostic burnup experiments at JT-60U [2]. Both these observations support the assertion that suprathermal ions

291

STRINGY K-THEORY AND THE CHERN CHARACTER - H. - H ...  

E-print Network

Oct 16, 2006 ... was done, for its financial support and hospitality, and the second author ...... parameter family of G-equivariant, almost complex structures Jt : TX ? TX for ..... Department of Mathematics; Brigham Young University; Provo, UT...

2006-10-16

292

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

Microsoft Academic Search

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

Sren Asmussen

1994-01-01

293

Enhanced pairing in doped quantum magnets with frustrated hole motion.  

PubMed

Evidence for strong pairing at arbitrarily small J/t is provided in a t-J model on the checkerboard lattice for a specific sign of the hopping amplitude. Destructive quantum interferences suppress Nagaoka ferromagnetism when J/t-->0 and drastically reduce coherent hole motion in the fluctuating singlet background. It is shown that, by pairing in various orbital symmetry channels, holes can benefit from a large gain of kinetic energy. PMID:15600875

Poilblanc, Didier

2004-11-01

294

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

Microsoft Academic Search

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

A. Piotrowska; M. Chorowski

2008-01-01

295

Current Status of Experimental Study and  

E-print Network

BS > 70% ·Normalized : N·` 3.5 Pulse Duration=? ITER DEMO Reactor JT-60U >1000 s>1000 s ~1 year~1 year ~10 Duration=? ITER DEMO Reactor JT-60U >1000 s>1000 s ~1 year~1 year ~10 s~10 s NCT >100 s>100 s Key.) have been installed. JAERI Bt(T) 0 1 2 3 4 0 20 40 60 80 Pulse length15s 65s time (s) Bt flat top 4Tx8s

296

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

NASA Astrophysics Data System (ADS)

An extension of deepspace research, specifically, the work done on Alpha program, will inevitably require new and different cryostating systems. The primary differences will be in the areas of cooling power and temperature. One variant which can be used with J-T cryocoolers is the application of diverse gas mixtures which can work over a large temperature range. We have found that the J-T cycle is an efficient application of mixed gas working fluids, being very similar to a vapor-compression cycle utilized in household refrigerants. The simplicity and viability of a J-T design and the associated minimal heat losses compensate for theoretical efficiency ratio of Stirling-type machines. Simultaneously, the J-T machines are never restricted in terms of output power and contain no moving parts in the cold zone resulting in minimal vibration during operation. The effective cooling of these systems allows parallel cooling of multiple objects. Finally in long-life system designs these cryocooler systems are feasibly coupled with phase-transition thermal storage accumulators. The application of such J-T systems is especially efficient under space conditions, due to the fact that there is an option to use at low temperatures a radiation release unit for the outlet of compression heat and for preliminary cooling of the system. This is not possible for terrestrial applications. Particularly, obtaining the -10 to 100 (C temperature range is feasible through the use of low As/(( - coefficient coatings; shade screens; or radiator unit orientations. Computational and experimental research has provided us high efficiency gas-mixture J-T cryocooler results between 60 to 100K cooling temperatures. We have actual space systems which were tested and operated for 80-90 K with efficiencies of 20 to 25 W/W. The authors of this research have studied various gas mixtures as candidates for use with simple J-T single contour J-T systems. We have seen resultant reduction of energy consumption by 2-3 times and decreases in temperatures from the 30-60( C range to -10 to 10( C range. We have also seen a dramatic reduction in the working pressure and the P/P pressure ratios within the cycle. We have gradually evolved into the application of simpler and more reliable working mixtures and employed more reliable single-stage compressors. In addition, the use of J-T contour gas mixtures for pre-cooling down to 35-40 K temperatures results in higher efficiency 2-stage J-T cryocoolers with similar overall results to the single stage systems.

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

297

Exact relativistic {beta} decay endpoint spectrum  

SciTech Connect

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.

Masood, S. S. [Department of Physics, 2700 Bay Area Boulevard, University of Houston Clear Lake, Houston, Texas 77058 (United States); Nasri, S. [Institute for Fundamental Theory, University of Florida, Gainesville, Florida (United States); Schechter, J. [Department of Physics, Syracuse University, Syracuse, New York 13244-1130 (United States); Tortola, M. A. [Departamento de Fisica and CFTP, Instituto Superior Tecnico, Avenida Rovisco Pais 1, P-1049-001 Lisboa (Portugal); Valle, J. W. F. [AHEP Group, Institut de Fisica Corpuscular-C.S.I.C./Universitat de Valencia, Edificio Institutos de Paterna, Apartado 22085, E-46071 Valencia (Spain); Weinheimer, C. [Institut fuer Kernphysik, Westfaelische Wilhelms-Universitaet Muenster, Wilhelm-Klemm-Strasse 9, D-48149 Muenster (Germany)

2007-10-15

298

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

NASA Astrophysics Data System (ADS)

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

Lee, Jisung; Lee, Kyungsoo; Jeong, Sangkwon

2013-05-01

299

Helium liquefaction using cryorefrigerators  

NASA Astrophysics Data System (ADS)

A two-stage Gifford-McMahon refrigerator with a Joule-Thomson (J-T) stage connected in series, was extended to a small helium liquefier. The plant can operate automatically. Helium is liquefied within the J-T cycle, directly after the J-T valve, into a 3l tank. This liquid He is used for the indirect cooling of an externally accessible sample chamber, either by using helium contact gas, or by means of liquid He condensed from an external helium gas source. The second design is meant for laboratory applications. The liquid helium tank is not incorporated in the J-T cycle, but thermally connected to the J-T stage of the refrigerator. The He gas from an external source is then condensed into the 2l tank. The liquid helium is accessible via a top-loading sample tube. The refrigerating capacity of both devices is 2W at 4.5K. The cleaning procedures for the He gas to be condensed into the tanks, and the production of temperatures below 4.2K in the He bath are described.

Forth, Hans-Joachim

1986-12-01

300

Potential improvements in turbofan engine fuel economy  

NASA Technical Reports Server (NTRS)

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.

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

1976-01-01

301

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

PubMed

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

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

2012-11-13

302

Pelotomaculum terephthalicum sp. nov. and Pelotomaculum isophthalicum sp. nov.: two anaerobic bacteria that degrade phthalate isomers in syntrophic association with hydrogenotrophic methanogens.  

PubMed

An anaerobic phthalate isomer-degrading strain (JT(T)) that we previously isolated was characterized. In addition, a strictly anaerobic, mesophilic, syntrophic phthalate isomer-degrading bacterium, designated strain JI(T), was isolated and characterized in this study. Both were non-motile rods that formed spores. In both strains, the optimal growth was observed at temperatures around 37 degrees C and neutral pH. In syntrophic co-culture with the hydrogenotrophic methanogen Methanospirillum hungatei, both strains could utilize two or three phthalate isomers for growth, and produce acetate and methane as end products. Strain JT(T) was able to grow on isophthalate, terephthalate, and a number of low-molecular weight aromatic compounds, such as benzoate, hydroquinone, 2-hydroxybenzoate, 3-hydroxybenzoate, 2,5-dihydroxybenzoate, 3-phenylpropionate in co-culture with M. hungatei. It could also grow on crotonate, hydroquinone and 2,5-dihydroxybenzoate in pure culture. Strain JI(T) utilized all of the three phthalate isomers as well as benzoate and 3-hydroxybenzoate for growth in co-culture with M. hungatei. No substrates were, however, found to support the axenic growth of strain JI(T). Neither strain JT(T) nor strain JI(T) could utilize sulfate, sulfite, thiosulfate, nitrate, fumarate, Fe (III) or 4-hydroxybenzoate as electron acceptor. Phylogenetically, strains JT(T) and JI(T) were relatively close to the members of the genera Pelotomaculum and Cryptanaerobacter in 'Desulfotomaculum lineage I'. Physiological and chemotaxonomic characteristics indicated that the two isolates should be classified into the genus Pelotomaculum, creating two novel species for them. Here, we propose Pelotomaculum terephthalicum sp. nov. and Pelotomaculum isophthalicum sp. nov. for strain JT(T) and strain JI(T), respectively. The type strains are strains JT(T) (= DSM 16121(T )= JCM 11824(T )= NBRC 100523(T)) and JI(T) (= JCM 12282(T) = BAA-1053(T)) for P. terephthalicum and P. isophthalicum, respectively. PMID:16404568

Qiu, Yan-Ling; Sekiguchi, Yuji; Hanada, Satoshi; Imachi, Hiroyuki; Tseng, I-Cheng; Cheng, Sheng-Shung; Ohashi, Akiyoshi; Harada, Hideki; Kamagata, Yoichi

2006-04-01

303

Improved components for engine fuel savings  

NASA Technical Reports Server (NTRS)

The Engine Component Improvement (ECI) Project formulated to address near term improvements for current engines is described with emphasis on the development of component technologies to reduce the fuel consumption of CF6, JT9D, and JT8D engines. The technical and economical acceptability and the fuel saving potential of nine concepts are demonstrated. Descriptions of these concepts, results of testing, and the status as to entering airline service are presented. Also presented is the status of the remaining concepts still under development.

Antl, R. J.; Mcaulay, J. E.

1980-01-01

304

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

NASA Technical Reports Server (NTRS)

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.

1981-01-01

305

Spring-Loaded Joule-Thomson Valve  

NASA Technical Reports Server (NTRS)

Improved design reduces clogging and maintains constant pressure drop as flow rate varies. Spring-Loaded Joule-Thomson Valve pressure drop regulated by spring pushing stainless-steel ball against soft brass seat. Pressure drop remains nearly constant, regardless of helium flow rate and of any gas contaminants frozen on valve seat. Because springloaded J-T valve maintains constant pressure drop, upstream roomtemperature throttle valve adjusts flow rate precisely for any given upstream pressure. In addition, new valve relatively invulnerable to frozen gas contaminants, which clog fixed-orifice J-T valves.

Jones, J. A.; Britcliffe, M. J.

1986-01-01

306

Erratum: ``Diffusive Migration of Low-Mass Protoplanets in Turbulent Disks'' (ApJ, 647, 1413 [2006])  

NASA Astrophysics Data System (ADS)

Because of an error in implementing proof corrections, fractional terms for the gamma functions in equation (1) and the unnumbered display equation following equation (4) are set incorrectly in the published version of the paper. These equations should read:D(J)=1/2-????(t-?/2,J)??(t+?/2,J)d? (1)and(?J)2=[?(J)?t+0?t??(t')dt'2=?(J)2(?t)2+0?tdtm-2tm2tmd???(tm-?/2,J)??(tm+?/2,J). The Press sincerely regrets these errors.

Johnson, Eric T.; Goodman, Jeremy; Menou, Kristen

2007-01-01

307

MATE program: Erosion resistant compressor airfoil coating, volume 2  

NASA Technical Reports Server (NTRS)

The performance of candidate erosion resistant airfoil coatings installed in ground tested experimental JT8D and JT9D engines and subjected to cyclic endurance at idle, takeoff and intermediate power conditions has been evaluated. Engine tests were terminated prior to the scheduled 1000 cycles of endurance test due to high cycle fatigue fracture of the Gator-Gard plasma sprayed 88WC-12Co coating on titanium alloy airfoils. Coated steel (AMS5616) and nickel base alloy (Incoloy 901) performed well in both engine tests. Post test airfoil analyses consisted of binocular, scanning electron microscope and metallographic examinations.

Freling, Melvin

1987-01-01

308

Signatures of extra dimensional sterile neutrinos  

NASA Astrophysics Data System (ADS)

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.

Rodejohann, Werner; Zhang, He

2014-10-01

309

Distribution of the 83Rb/83mKr activity on vacuum evaporated samples examined with the Timepix position sensitive detector  

E-print Network

Properties of vacuum evaporated 83Rb/83mKr sources of low-energy conversion electrons, which are under development for monitoring the energy scale stability of the Karlsruhe Tritium Neutrino experiment KATRIN, were examined by the Timepix pixel detector exhibiting the position resolution of at least 55 microm. No distinct local inhomogeneities in the surface distribution of 83Rb/83mKr were observed. The source diameter derived from the recorded image agrees within 5 % with that expected from evaporation geometry. More precise determination of the actual source diameter is complicated by Compton scattered electrons caused by 83Rb gamma-rays.

D. Venos; J. Jakubek; O. Dragoun; S. Pospisil

2007-12-22

310

ORNL White Paper on Materials for LWRSP 1 Materials Degradation in Light Water Reactors: Life After 60  

E-print Network

60 J.T. Busby, R.K. Nanstad , R. E. Stoller, Z. Feng, and D.J Naus Materials Science and Technology further life extension, two-thirds cited plant reliability as the key issue with materials aging and cable-574-4471 #12;ORNL White Paper on Materials for LWRSP 2 Following each of these areas, some research thrust

Pennycook, Steve

311

Constitutional and Statutory Regulation of Private Colleges and Universities  

ERIC Educational Resources Information Center

Considers the main thrust of recent increases in judicial and administrative review of the internal policies of colleges and universities, pointing out exceptions presently applicable to private institutions. Conclusion: Private colleges would be well advised to comply voluntarily with laws which admittedly apply only to public institutions. (JT)

Faccenda, Philip J.

1975-01-01

312

National Collegiate Athletic Association's Certification Requirement: A Section 1 Violation of the Sherman Antitrust Act  

ERIC Educational Resources Information Center

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)

Valparaiso University Law Review, 1974

1974-01-01

313

The Retrenchment Knife  

ERIC Educational Resources Information Center

Horizontal vs. vertical cuts, that is the key question. Faculties favor the horizontal (put us all in the same boat), but the deep vertical cut (e.g. staff and program reduction) is, the author argues, most likely to cure an institutional illness. (Editor/JT)

Dozier, John M.

1976-01-01

314

Implant Experience and Positional Stability of AC Electromagnetic Beacon Transponders Used to Localize Patients for External Beam Radiation Therapy of the Prostate  

E-print Network

Implant Experience and Positional Stability of AC Electromagnetic Beacon® Transponders Used to Localize Patients for External Beam Radiation Therapy of the Prostate T.R. Willoughby1, P.A. Kupelian1, J.W. Hadley5, J.T. Wei6, H.M. Sandler5 1 Radiation Oncology, MD Anderson Cancer Center Orlando, Orlando, FL, 2

Pouliot, Jean

315

Validation of aircraft noise prediction program  

NASA Technical Reports Server (NTRS)

Predictions made with NASA's aircraft noise prediction program (ANOPP) were compared with flyover noise data. A data base of six flyover noise runs for the DC-10-40/JT9D-59A configuration was used. For all power settings, ANOPP consistently underpredicted the low frequency spectral levels, overpredicted high frequency spectral levels and, consequently, overpredicted the inlet and aft PNLT time histories.

Kapper, C. Y.

1979-01-01

316

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

Federal Register 2010, 2011, 2012, 2013

...JT9D-7R4E1 and -7R4E1H engine models are no longer...installed on other engine models, we modified the installation prohibition paragraph...installed in any other engine. Further, we noted...substantial direct effect on the States,...

2012-03-23

317

LOW TECHNOLOGY HIGH TRITIUM BREEDING BLANKET CONCEPT* Y. Gohar, C. C. Baker, D. L. Smith, M. C. Billone, Y. S. Cha,  

E-print Network

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

Harilal, S. S.

318

FEEDING AND GROWTH HORMONE AFTER CEREBROVENTRICULAR CARBACHOL IN SHEEP  

E-print Network

FEEDING AND GROWTH HORMONE AFTER CEREBROVENTRICULAR CARBACHOL IN SHEEP P.M. DRIVER J.M. FORBES Department of Animal Physiology and Nutrition, University of Leeds, LS2 9JT, England. Intracerebroventricular. The resumption of feeding coinci- ded with the fall in GH. Normal peaks of plasma GH are associated with periods

Boyer, Edmond

319

Late PleistoceneHolocene sedimentation surrounding an active seafloor gas-hydrate and cold-seep field on the Northern Gulf of Mexico Slope  

E-print Network

Late Pleistocene­Holocene sedimentation surrounding an active seafloor gas-hydrate and cold-seep 2010 Communicated by J.T. Wells Keywords: gas hydrate(s) cold or petroleum seep(s) Mississippi Canyon surrounding an active gas-hydrate and cold- seep field, situated on the northern Gulf of Mexico slope within

Meyers, Stephen R.

320

Programmed Student Achievement: A Hawthorne Effect?  

ERIC Educational Resources Information Center

Three groups of college students were given instructions using different testing techniques to determine whether the superior performance obtained with Programed Student Achievement (PA) was due to a Hawthorne Effect. Results seem to preclude any attempt to interpret the effectiveness of PA on that basis. (Editor/JT)

Haddad, Nabil F.; And Others

1975-01-01

321

Near-infrared photoabsorption by C60 dianions in a storage ring U. Kadhane,1,a  

E-print Network

. The electronic levels of the dianion are split due to Jahn­Teller coupling to quadrupole deformations of the competition between Coulomb repulsion between the two electrons and Jahn­Teller JT coupling to quadrupole: 10.1063/1.3149775 I. INTRODUCTION Fullerene anions are of broad interest, e.g., in high-Tc

Hansen, Klavs

322

Plant physiology Acclimatization and flower induction  

E-print Network

Plant physiology Acclimatization and flower induction of tissue culture derived cocoyam (Xanthosoma sagittifolium Schott) plants OU Onokpise1 JT Tambong2 L Nyochembeng2 JG Wutoh3 Florida A & M University, 1 for production of tissue culture plants, from cocoyam (Xanthosoma sagittifolium) plants growing in agroecological

Paris-Sud XI, Université de

323

Sanctions and mutualism stability: when should less beneficial mutualists be tolerated?  

E-print Network

,* E. TOBY KIERS, I. PEN* & R. F. DENISON *Institute of Cell, Animal & Population Biology, University studied with the Prisoner's Dilemma (PD). If the same partners interact repeatedly (iterated PD, Animal & Population Biology, University of Edinburgh, Edinburgh, EH9 3JT, UK. Tel.: +131 6505496; fax

West, Stuart

324

Cluster of Infections Caused by Methicillin-Resistant Staphylococcus pseudintermedius in Humans in a Tertiary Hospital  

PubMed Central

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-IIIII. 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

Brjesson, Stefan; Grnlund-Andersson, Ulrika; Tellgren-Roth, Christian; Melhus, sa

2014-01-01

325

Infrared Absorption Spectra of Jahn-Teller Systems: Application to the Transition-Metal Trifluorides MnF3 and NiF3.  

PubMed

The theory for the calculation of vibronic absorption spectra within a Jahn-Teller (JT) active electronic state from first principles has been developed. The infrared absorption spectra of the (5)E' ground state, the low-lying (5)E? excited state of MnF3, and the (4)E' state of NiF3 have been computed and analyzed. Dipole moment derivatives have been determined by a linear-plus-quadratic expansion of nuclear dipole moment functions in the JT-active coordinates. Electronic transition dipole moments have been taken into account in the Condon approximation in the diabatic representation. The initial and final vibronic states have been expanded in a product of diabatic electronic states and vibrational basis functions. The effect of spin-orbit coupling on the vibronic infrared spectra of these molecules in their JT-active electronic states has been investigated, by employing the Breit-Pauli spin-orbit operator. The effect of temperature on the vibronic infrared spectra has also been explored. These results represent the first theoretical study of vibronic infrared spectra of JT-active states in transition metal compounds. PMID:24785833

Mondal, Padmabati; Domcke, Wolfgang

2014-05-14

326

Cerebral amyloid angiopathy (CAA) affects a majority of Alzheimer's disease patients and is associated with a rapid  

E-print Network

Cerebral amyloid angiopathy (CAA) affects a majority of Alzheimer's disease patients in Alzheimer's disease brain. Jaruszewski KM, Curran GL, Swaminathan SK, Rosenberg JT, Grant SC, Ramakrishnan S in brain arteriole of a transgenic mouse model of Alzheimer's disease. Blue fluorescence visualizes

McQuade, D. Tyler

327

Production of Artificial Lightning in An Ordinary Clear Light Bulb.  

ERIC Educational Resources Information Center

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)

Zaffo, Peter Alfred

1981-01-01

328

VOLUME 80, NUMBER 15 P H Y S I C A L R E V I E W L E T T E R S 13 APRIL 1998 Duality Transformation in a Three Dimensional Conducting Medium with Two Dimensional  

E-print Network

of a periodic array of parallel cylindrical inclusions, which are either perfect insulators or superconductors magnetoresistance in some important configurations. [S0031-9007(98)05772-X] PACS numbers: 73.50.Jt, 03.50.Kk, 72 be obtained from the magnetoresistivity of the pure metal and the bulk effective zero field resistivity [7

Strelniker, Yakov M.

329

Medical Academe and the Problems of Primary Care  

ERIC Educational Resources Information Center

The President of the Robert Wood Johnson Foundation points up the lack of a dependable system of ambulatory front-line medical care in the U.S., outlines basic capabilities of the system needed, and suggests the role of foundations and academic centers in developing training programs recast in light of real world situations. (JT)

Rogers, David E.

1975-01-01

330

Center for Turbulence Research Proceedings of the Summer Program 2012  

E-print Network

-entropy combustion instability in a realistic gas turbine By E. Motheau, L. Selle, Y. Mery, T. Poinsot AND F. Nicoud release fluctuations are in phase (Lieuwen & Yang 2005). Another mechanism that may also support self p(x, t) = ^p(x)exp(-jt) in reacting flows may be derived from the Navier-Stokes equations (Poinsot

Wang, Wei

331

Virtual Histology of Transgenic Mouse Embryos for High-Throughput Phenotyping  

E-print Network

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

Capecchi, Mario R.

332

SHELTER THROUGH ARCHITECTURAL DESIGN, THE SHIELDING REQUIREMENTS INFLUENCE ON FORM.  

ERIC Educational Resources Information Center

FALLOUT PROTECTION CAN BE PROVIDED BY CAREFUL ARRANGEMENT OF ARCHITECTURAL ELEMENTS WITHOUT SPECIFIC FACILITIES FOR THEIR PURPOSE AND WITHOUT INTERFERING WITH NORMAL SPACE USE. CHARACTERISTICS OF RADIATION ARE DISCUSSED AND ILLUSTRATED PRINCIPLES OF SHIELDING DESIGN WITH RESPECT TO DISTANCE, GEOMETRY, AND TIME ARE GIVEN. (JT)

Office of Civil Defense (DOD), Washington, DC.

333

Aykroyd, R.G.; Lucy, D.; Pollard, A.M; Solheim, T. Title: Regression analysis in adult age estimation  

E-print Network

estimation Journal: American Journal of Physical Anthropology Date: 1997 Volume: 104(2) Pages: 259, U.K. LS2 9JT. 2Department of Archaeological Sciences, University of Bradford, Bradford, West Yorkshire, U.K. BD7 1DP. 3Department of Oral Pathology and Section for Forensic Odontology. Box 1109

Lucy, David

334

The Challenge of Qualitative Spatial Division of Artificial Intelligence  

E-print Network

The Challenge of Qualitative Spatial Reasoning A G Cohn Division of Artificial Intelligence School of Computer Studies University of Leeds Leeds LS2 9JT England. \\Lambda The principal goal of Qualitative, diagnoses and explain the behaviour of physical systems in a qualitative manner, even when a precise

Leeds, University of

335

BIOGRAPHICAL SKETCH Provide the following information for the key personnel and other significant contributors in the order listed on Form Page 2.  

E-print Network

Dis. 1998 Jul;178(1):8-15. 4. Terhune SS, Milcarek C, Laimins LA. Regulation of human papillomavirus papillomavirus type 11 in keratinocytes that stably maintain viral episomes. J Virol. 2001 Aug;75(16):7564-71. 6. Terhune SS, Hubert WG, Thomas JT, Laimins LA. Early polyadenylation signals of human papillomavirus type

336

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

E-print Network

-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

Mousseau, Timothy A.

337

IEEE JOURNAL OF QUANTUM ELECTRONICS, VOL. 36, NO. 11, NOVEMBER 2000 1299 Theory of Large-Signal Direct Modulation of  

E-print Network

-Signal Direct Modulation of Extended Cavity Semiconductor Lasers with Dispersive Loss L. Ramunno and J. E. Sipe, the Ontario Graduate Scholarship Pro- gram for Science and Technology, and the Walter C. Sumner Foundation field resulting from the direct modulation of the bias current density across the diode J(t). (b

Sipe,J. E.

338

The Critical Balance: Reader, Text, and Meaning.  

ERIC Educational Resources Information Center

Proposes that literary analysis and criticism need to strike a balance between reader and text, between subjectivity and objectivity. Notes that literary works call for different critical approaches and urges English teachers to develop students' skills for apprehending what approach should be used with particular works. (JT)

Rabinowitz, Nancy; Rabinowitz, Peter

1980-01-01

339

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.

340

Maharishi International University  

ERIC Educational Resources Information Center

The director of curriculum development at Maharishi International University describes background and design of the program based on the Science of Creative Intelligence (SCI) as a unifying theoretical structure and on transcendental meditation (TM) for expanding awareness and utilizing videotape technology in its core curriculum courses. (JT)

Goldberg, Phil

1975-01-01

341

Selected invited addresses Our faculty members have been giving invited  

E-print Network

Computing, Glen Eden Beach, OR. Selman. Plenary. Intl. Jt. Conf. Artificial Intelligence (IJCAI), Edinburgh, Scotland. ___. Plenary. 8th Biennial Israeli Symp. Foundations AI, Haifa, Israel. Shmoys. Plenary. New Conf. Networks, Santa Fe. NM. Kozen. Int. Conf. Logic for Programming, Artificial Intelligence

Keinan, Alon

342

Summary of current research interests The Cells for Sight team is aiming to understand the biology and  

E-print Network

and clinical techniques for human LESC transplantation. We are also investigating the role of connective tissue, Blalock, TD, Grotendorst, GR, Schultz, GS and Daniels, JT. 2004 Connective tissue growth factor dependency of Regenerative Medicine and Cellular Therapy, Director Cells for Sight Tissue Bank (Moorfields Eye Hospital

Saunders, Mark

343

Self-organization and symmetry-breaking in two-dimensional plasma turbulence  

E-print Network

Self-organization and symmetry-breaking in two-dimensional plasma turbulence Wouter J.T. Bos1'Aix-Marseille, Marseille, France Abstract The spontaneous self-organization of two-dimensional magnetized plasma-breaking induced by the shape of the confining boundaries. This symmetry-breaking is quantified by the an- gular

Paris-Sud XI, Université de

344

Nonparametric regression for spherical data Marco Di Marzio  

E-print Network

objects described through Computer Aided Design, and Coordinate Measuring Machine data. Spherical Department of Statistics, University of Leeds, Leeds LS2 9JT, UK email: charles@maths.leeds.ac.uk October 21-mail: charles@maths.leeds.ac.uk). We are grateful to an Associate Editor and two anonymous Referees

Taylor, Charles C.

345

Open Archive TOULOUSE Archive Ouverte (OATAO) OATAO is an open access repository that collects the work of Toulouse researchers and  

E-print Network

Vflsacc Feed rate for static look ahead imposed by the acceleration Vflsjerk Feed rate for static look(t),Af Instantaneous feed acceleration A ! Feed acceleration vector At Tangential acceleration An Normal acceleration Amax Maximal acceleration Amaxi Maximal acceleration of axis (i) J(t) Instantaneous feed Jerk J ! Jerk

Boyer, Edmond

346

AUSLANDER ALGEBRAS AS QUASI-HEREDITARY VLASTIMIL DLAB AND CLAUS MICHAEL RINGEL  

E-print Network

that in this way we obtain a heredity chain of ideals of A (see the definition below). Usually, there exist many/N is semisimple artinian. We say that an ideal J of A is a heredity ideal of A if P = J, JNJ = 0 and /, considered, for each 1 heredity ideal of A/Jt_v Such a sequence of ideals is called

Ringel, Claus Michael

347

Time Management in Higher Education Administration: A Case Study  

ERIC Educational Resources Information Center

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)

Lewis, Darrell R.; Dahl, Tor

1976-01-01

348

Scientific Research and Agricultural Innovation in Israel  

ERIC Educational Resources Information Center

Traces the development and interrelationships of agriculture and agricultural research in Israel since 1920, concluding that major contributing factors to successful relationship between research and production in agriculture are a rise in the educational level of the agricultural population and a thorough knowledge of the soil and climate. (JT)

Ben-David, Joseph; Katz, Shaul

1975-01-01

349

Bookstore in Trouble: The Proverbial Iceberg  

ERIC Educational Resources Information Center

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)

Sanderson, Ivan L.

1975-01-01

350

77 FR 15939 - Airworthiness Directives; Pratt & Whitney Turbofan Engines  

Federal Register 2010, 2011, 2012, 2013

...the Airworthiness Limitations Section (ALS) of the manufacturer's Instructions for...additional revisions to the JT9D series engines ALS sections of the manufacturer's ICA. This...to continue to require revisions to the ALS of the manufacturer's ICA to include...

2012-03-19

351

Generalized oscillator strengths for inner-shell excitation of SF6 recorded with a high-performance electron energy loss  

E-print Network

-exchange) inner shell electronic transitions of gases, and systematic measurements of their angular and impactGeneralized oscillator strengths for inner-shell excitation of SF6 recorded with a high-performance electron energy loss spectrometer I.G. Eustatiu a , J.T. Francis b , T. Tyliszczak b , C.C. Turci c , A

Hitchcock, Adam P.

352

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

E-print Network

any of their employees, makes any warranty, express or implied, or assumes any legal liability energetic ions Ya.I. Kolesnichenko , V.S. Marchenko , and R.B. White Institute for Nuclear Research, Kyiv beam injection in JT-60U (G.J. Kramer et al., Nuclear Fusion 40, 1383 (2000)). #12;It is known

353

The Congressional Internship Program  

ERIC Educational Resources Information Center

A program description, including historical development, of the congressional intern program on Capitol Hill, which in the summer of 1974 involved 1800 college students and teenagers, 15 or 20 in the offices of some Senators. The program includes formal speaker and seminar programs as well as work experience. (JT)

Seltzer, Garry; Seltzer, Leslye

1975-01-01

354

Preliminary design study of astronomical detector cooling system  

NASA Technical Reports Server (NTRS)

The preliminary design of an astronomical detector cooling system for possible use in the NASA C-141 Airborne Infrared Observatory is presented. The system consists of the following elements: supercritical helium tank, Joule-Thomson supply gas conditioner, Joule-Thomson expander (JTX), optical cavity dewar, optical cavity temperature controller, adjustable J-T discharge gas pressure controller, and vacuum pump.

Norman, R. H.

1976-01-01

355

School of Food Science and Nutrition  

E-print Network

School of Food Science and Nutrition FACULTY OF MATHEMATICS AND PHYSICAL SCIENCES Food Science IS IT Activities will be held in the School of Food Science and Nutrition on the University of Leeds campus Science and Nutrition University of Leeds Leeds LS2 9JT Tel: 0113 3432958 www.food.leeds.ac.uk Sponsored

Haase, Markus

356

Constitutional Law: Charitable Tax Exemptions as State Action  

ERIC Educational Resources Information Center

The doctrine of "state action" as a prerequisite to the application of federal civil rights laws is reviewed with reference to Jackson v. Statler Foundation, which the author sees as having adverse effects on the workings of charitable institutions, blocking innovation and experimentation through philanthropic grants from small foundations. (JT)

Walsh, Kate Monica

1975-01-01

357

Salt tectonics driven by differential sediment loading: Stability analysis and finite element experiments  

E-print Network

1 Salt tectonics driven by differential sediment loading: Stability analysis and finite element University of Leeds Leeds LS2 9JT United Kingdom e-mail: lykke@earth.leeds.ac.uk Short running title: Salt salt layer drives salt deformation and has a significant impact on the structural evolution

Beaumont, Christopher

358

Numerical Modeling of Salt Tectonics on Passive Continental Margins: Preliminary Assessment of the Effects of Sediment Loading,  

E-print Network

Numerical Modeling of Salt Tectonics on Passive Continental Margins: Preliminary Assessment Sciences The University of Leeds LS2 9JT Leeds United Kingdom Abstract Salt tectonics in passive model of frictional-plastic sedimentary overburden overlying a linear viscous salt layer. We present

Beaumont, Christopher

359

Chiang Mai and Illinois: A Cooperative International Project, 1962-70  

ERIC Educational Resources Information Center

A relationship between the medical schools of Chiang Mai University and the University of Illinois, part of a national involvement in Thailand's socioeconomic development, is analyzed. Antecedents, activities, outcomes, and problems are reviewed with emphasis on need for sound training, energy, adaptability, and investment of years. (JT)

Doege, Theodore C.; And Others

1976-01-01

360

Apidologie 37 (2006) 673678 673 c INRA/DIB-AGIB/ EDP Sciences, 2006  

E-print Network

in several in vivo and in vitro test systems (WHO, 1994, 1995). Con- sequently, its use in food food matrices (Hormazabal and Yndestad, 2001; Verzegnassi et al., 2003; Gantverg et al., 2003; Ramos et and solvents were of analytical or HPLC grade quality and were supplied by J.T. Baker (Deventer, Holland

Paris-Sud XI, Université de

361

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...

362

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

ERIC Educational Resources Information Center

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)

Larned, Deborah

1975-01-01

363

Hole pairs in a spin liquid: Influence of electrostatic hole-hole repulsion Claudio Gazza and George B. Martins  

E-print Network

Hole pairs in a spin liquid: Influence of electrostatic hole-hole repulsion Claudio Gazza in Sr14 xCaxCu24O41 Ref. 1 under high pressure has triggered a considerable effort to understand of view. The ne- glect of electrostatic interactions is particularly important for values of J/t such as 0

Martins, George

364

Power Output Element (POE) -provides new power to CEB-R  

E-print Network

Analytics 3:STSci 4: ESA 5: Ball Aerospace 6: GST 7: MEI 8: J&T 9: Teledyne Imaging Sensors 10: ATK Contact NASA's Goddard Space Flight Center, Ball Aerospace, and Teledyne Imaging Sensors. It determined (Fab, Assembly, and Testing), Teledyne (ASIC design and testing), Goddard (system integration

Sirianni, Marco

365

ACS Failure: ACS Side-1 failed on June 19, 2006  

E-print Network

-180 nm; 35x31" FOV with 0.031" pixels 6 filters, 2 prisms (spectroscopic capability) Teledyne (ASIC Analytics, 2STScI, 3NASA/GSFC, 4Ball Aerospace, 5GST, 6MEI, 7J&T, 8Teledyne Imaging Sensors, 9ATK,10ESA ACS

Sirianni, Marco

366

UNREDUCED SYMMETRIC KKT SYSTEMS ARISING FROM ...  

E-print Network

Jul 1, 2014 ... Programming (QP) problems have been an intensive area of research in the past decades. ... covered several different aspects such as the level of accuracy in the solution of linear .... xT Hx subject to JT y + z ? Hx = c, z ? 0,.

2014-07-01

367

Issues in Primary Care: The Academic Perspective  

ERIC Educational Resources Information Center

Outlines the problems requiring restructuring of programs to prepare two new types of primary care physicians: a family physician who is predominantly an ambulatory care specialist and a primary care internist, pediatrician, or obstetrician who cares for most diseases in office and hospital. (JT)

Petersdorf, Robert G.

1975-01-01

368

ER QUALITY CONTROL CAN LEAD TO RETROGRADE TRANSPORT FROM THE ER LUMEN TO THE CYTOSOL AND THE NUCLEOPLASM IN  

E-print Network

, Leeds Institute for Plant Biotechnology and Agriculture, School of Biology, University of Leeds, LS2 9JT. Complete signal peptide processing even after long term expression in virus infected leaves rules out inhibitors. The use of GFP imaging in the detection of retrograde transport from the ER and screening

369

Control of Supersonic Resonant Flows Using High Bandwidth Micro-actuators  

E-print Network

Control of Supersonic Resonant Flows Using High Bandwidth Micro-actuators J.T. Solomon$1 , S. Hong bandwidth micro-actuators for the control of supersonic resonant flows. The striking feature of this micro-actuator. First generation micro-actuators are designed and their performance is tested in controlling the highly

370

Provisional Programme for the 21st Fusion Energy Conference (Oral Sessions)  

E-print Network

United States of America Development in the DIII-D Tokamak of Advanced Operating Scenarios and Associated and projection to ITER EX/1-2 Greenfield, CM United States of America Progress Toward High Performance Steady-State in JT-60U EX/1-5 (theory) Chu, MS United States of America Maintaining the Quasi-Steady State Central

371

Racial Bias and the LSAT: A New Approach to the Defense of Preferential Admissions  

ERIC Educational Resources Information Center

The question of possible racial bias in the Law School Admissions Test (LSAT), the issue crucial to future tests of the constitutionality of preferential admissions, is explored with the conclusion that uncertainties in this area should not overshadow the necessity for reexamination of law school admission criteria. (JT)

Weber, David A.

1975-01-01

372

Rule 144: The Applicability of the Restricted Securities Requirements to Colleges and Universities  

ERIC Educational Resources Information Center

The Federal Securities and Exchange Commission's new Rule 144 applicable to public transactions in restricted securities is reviewed with the conclusion that maximum benefits to colleges and universities can be obtained only after various areas of uncertainty engendered by the Rule are clarified by the Commission. (JT)

Hopkins, Bruce R.

1973-01-01

373

Cooperative Jahn-Teller effect in a 2D mesoscopic C{60/n-} system with D5d symmetry adsorbed on buffer layers using Ising EFT model  

NASA Astrophysics Data System (ADS)

Fullerene molecules adsorbed on surfaces often show macroscopic average distortions. As charged ions C60n- are known to be Jahn-Teller (JT) active, it is suggested that these distortions could be a manifestation of cooperative JT effects (CJTE) due to interactions between neighbouring fullerene ions. In order to understand the distortion properties it is necessary to take correlations between different distortions into account. However, this can't easily be done in the mean field approximation usually used to describe the CJTE. We therefore propose an alternative procedure to describe 2D mesoscopic islands of C60 ions in which a pseudo vector spin overrightarrow{S} is evoked to represent degenerate JT-distorted states when the quadratic JT coupling is considered. This approach is analogous to methods used for 2D magnetic systems. We then use the differential operator technique in effective field theory within the Ising approach. We include the effects of weak surface interactions and dynamic motion between equivalent distortions via terms equivalent to anisotropy and a transverse field in magnetism respectively. For distortions to D5d symmetry, we determine single site correlations as a function of temperature, the macroscopic average distortion describing a structural phase transition, and the isothermal response function. Phase diagrams are presented for relevant cases of the system parameters.

Abou Ghantous, M.; Moujaes, E. A.; Dunn, J. L.; Khater, A.

2012-06-01

374

4, 57335788, 2004 Development of a  

E-print Network

of the emission of air pollutants on the formation of ozone. The Master 5734 #12;ACPD 4, 5733­5788, 2004 School of Chemistry, University of Leeds, Leeds LS2 9JT, UK 2 Imperial College London, Silwood Park an idealised trajectory, characteristic of a photochemical pollution episode in northwest Europe (Derwent et al

Paris-Sud XI, Université de

375

Atmos. Chem. Phys., 3, 181193, 2003 www.atmos-chem-phys.org/acp/3/181/ Atmospheric  

E-print Network

, Berkshire, SL5 7PY, UK 2School of Chemistry, University of Leeds, Leeds, LS2 9JT, UK 3Disciplines of a variety of secondary pollutants, including ozone and secondary or- ganic aerosol, SOA (e.g. Jenkin). The representation of mechanisms describing the degra- dation of aromatic hydrocarbons in air quality models has long

Paris-Sud XI, Université de

376

Atmos. Chem. Phys., 5, 641664, 2005 www.atmos-chem-phys.org/acp/5/641/  

E-print Network

of a photochemical pollution episode in north- west Europe (Derwent et al., 1996). Air quality models make use of detailed photochemical mechanisms to assess the importance of the emission of air pollutants. Wenger5, and M. J. Pilling1 1School of Chemistry, University of Leeds, Leeds LS2 9JT, UK 2Imperial

Paris-Sud XI, Université de

377

Atmos. Chem. Phys., 14, 1264912663, 2014 www.atmos-chem-phys.net/14/12649/2014/  

E-print Network

chemical transport models (CTMs) are used extensively to study air pollution and transport at a global impacts of air pollutants from major anthropogenic source regions. 1 Introduction Global air pollution and Oceanic Sciences, School of Physics, Peking University, Beijing 100871, China Correspondence to: J.-T. Lin

Pierce, Jeffrey

378

Information Granulation for Web based Information Retrieval Support Systems  

E-print Network

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 supports a different user task. Keywords: Information retrieval, Granular computing, Information

Yao, JingTao

379

Effectiveness of an International Health Elective As Measured by NBME Part II  

ERIC Educational Resources Information Center

National Board of Medical Examiner's exam results show that U.S. medical students who participated between 1968 and 1974 in Yugoslav or Israeli international fellowship programs sponsored by the Association of American Medical Schools and the U.S. Public Health Service gained knowledge of preventive medicine and public health. (JT)

Waddell, Wendy; And Others

1976-01-01

380

The Rockefeller University Press $30.00 J. Exp. Med.  

E-print Network

priming and directing the function of T cells (Banchereau and Steinman, 1998; Kapsenberg, 2003). Although, their activation and function in response to Th2-inducing pathogens is less well defined (Pearce and Mac, EH9 3JT, Scotland, UK 3Department of Molecular Immunology, German Cancer Research Centre, 69120

Maizels, Rick

381

INHIBITION OF AROMATASE CYTOCHROME P-450 (ESTROGEN SYNTHETASE) BY DERIVATIVES OF ALPHA-NAPHTHOFLAVONE  

EPA Science Inventory

alpha-Naphthoflavone (ANF; 7,8-benzoflavone) is a potent competitive inhibitor of human aromatase cytochrome P-450 (J.T. Kellis, Jr. and L.E. Vickery, Science 225, 1032 (1984)). The authors have further investigated inhibition of aromatase by several derivatives of ANF. Using hum...

382

The Future of Fusion Jiangang Li (j_li@ipp.ac.cn)  

E-print Network

, ,JT-60, JET (16MW) TFTR 10MW ITER ITER site decided #12;Lessons learned from past ­ TFTR construction.10.24, ITER-IO 2007.10-2019.11, construction #12;GAPAnalysis: > 50 years to power Plant 10 year 10 years 10 industrial involvement. Cost #12;Road Map US: ITER--IFMIF+CTF(FNF)--DEMO-Power Plant EU&JP: ITER

383

Preparation of Guidance Counsellors for the UPE Beneficiaries  

ERIC Educational Resources Information Center

The launching in 1975-76 of Universal Free Primary Education (UPE) for the Federal Republic of Nigeria creates a new need for school counselors of UPE recipients, who may leave school at age 15. The author presents guidelines for recruitment and selection and outlines a 3-year counselor training curriculum. (JT)

Makinde, Olu; Gesinde, S. A.

1975-01-01

384

arXiv:physics/0306097v112Jun2003 CHEP03 Conference for Computing in High Energy and Nuclear Physics, La Jolla, CA, USA, March 2003 1 Architecture of the ATLAS High Level Trigger Event Selection Software  

E-print Network

arXiv:physics/0306097v112Jun2003 CHEP03 ­ Conference for Computing in High Energy and Nuclear Physics, La Jolla, CA, USA, March 2003 1 Architecture of the ATLAS High Level Trigger Event Selection Software S. Armstrong, K.A. Assamagan, J.T. Baines, C.P. Bee, M. Biglietti, A. Bogaerts, V. Boisvert, M

Anjos, André

385

American Mineralogist, Volume 97, pages 12561259, 2012 0003-004X/12/00071256$05.00/DOI: http://dx.doi.org/10.2138/am.2012.4148 1256  

E-print Network

Raman spectroscopic imaging. The excitation source is a frequency-doubled solid-state YAG laser (532 nm and Environment, University of Leeds, Leeds LS2 9JT, U.K. AbStrAct We use confocal Raman imaging spectroscopy Lab, Raman spectroscopy, magnetite, volatiles introduction Studies of the martian meteorite Allan

Benning, Liane G.

386

Action of plant growth regulators and salinity on seed germination of Ceratoides lanata  

Microsoft Academic Search

Ceratoides lanata (Pursh) J.T. Howell is a shrub with numerous annual branchlets from the family Chenopodiaceae and is widely distributed in brackish water playas of northern Utah. Seeds had no dormancy, and about 90% of the seeds germinated in nonsaline control. Seed germination decreased with the increase in salinity, and more than 10% of the seeds germinated at 900 mmol\\/L

M. Ajmal Khan; Bilquees Gul; Darrell J. Weber

2004-01-01

387

The influence of shear bands on final structure and magnetic properties of 3% Si non-oriented silicon steel  

NASA Astrophysics Data System (ADS)

The presence of shear bands in the deformed material before final annealing is very important for Goss and Cube textures formation in silicon steel [S.C. Paolinelli, M.A. Cunha, J. Magn. Magn. Mater. 255 (2003) pp. 379. [1]; J.T. Park, J.A. Szpunar, Acta Mater., 51 (2003) 3037. [2

Paolinelli, Sebastio da Costa; da Cunha, Marco Antnio; Cota, Andr Barros

388

A highly efficient 100 L\\/HR class helium liquefier system  

Microsoft Academic Search

A new helium liquefier system has been designed and built to provide over 100 liters per hour with a highly efficient process cycle. The modified Claude-cycle utilizes four reciprocating piston expansion engines configured in series, with the lowest temperature engine acting as a wet expander (replacing the usual JT valve). Operation of the system is highly flexible, permitting the use

Thomas Ankermann; Roberto Than; Hank Valcour

1994-01-01

389

Rab23 is a flagellar protein in Trypanosoma brucei  

E-print Network

brain gene product Rab23: expression pattern in the adult mouse brain and functional characterization. J Neurosci Res 2006, 83:1118-27. 11. Eggenschwiler JT, Bulgakov OV, Qin J, Li T, Anderson KV: Mouse Rab23 regulates hedgehog signaling from smoothened...

Lumb, Jennifer H; Field, Mark C

2011-06-15

390

Comprehensive Lifestyle Support for Adults with Challenging Behavior: From Rhetoric to Reality  

E-print Network

that we have addressed include pouring mouthwash down the sink (to the tune of Let It Be), getting up in the morning (to the tune of Wake Up, Little Suzie), and hair pulling using original lyrics that JT is currently helping create. To increase...

Turnbull, Ann P.; Turnbull, H. Rutherford

1999-01-01

391

On the Track of Syncope induced by Orthostatic Stress -Feedback Mechanisms Regulating the Cardiovascular System  

E-print Network

the Cardiovascular System Ottesen JT.* and Olufsen MS.** *Roskilde University, 4000 Roskilde, Denmark (Tel: (+45 4674-mail: msolufse@unity.ncsu.edu) Abstract: A physiological realistic model of the controlled cardiovascular system. It turns out that this mechanical effect is significant. Keywords: Cardiovascular, control, sit

Olufsen, Mette Sofie

392

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

SciTech Connect

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.

Shimazaki, T. [National Metrology Institute of Japan, AIST, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563 (Japan)] [National Metrology Institute of Japan, AIST, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563 (Japan)

2013-09-11

393

Handbook, Marlboro College, Vermont.  

ERIC Educational Resources Information Center

Contents of this faculty handbook are academic and non-academic campus regulations, statements regarding the Privacy Act of 1974, an organizational chart, Marlboro College Community Constitution and By-Laws, Articles of Association of the Corporation of Marlboro College, and Alumni Association By-Laws. (JT)

Marlboro Coll., VT.

394

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

E-print Network

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

Sites, James R.

395

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.

396

The Simulation of Photochemical Smog Episodes in Hungary and Central Europe Using Adaptive Gridding  

E-print Network

The Simulation of Photochemical Smog Episodes in Hungary and Central Europe Using Adaptive Gridding, Leeds, LS2 9JT, UK Abstract. An important tool in the management of photochemical smog episodes. An important tool in the management of photochemical smog episodes is a computational model which can be used

Utah, University of

397

LATE QUATERNARY EVOLUTION OF THE NORTHEAST FAN, OFFSHORE NOVA SCOTIA  

E-print Network

LATE QUATERNARY EVOLUTION OF THE NORTHEAST FAN, OFFSHORE NOVA SCOTIA Matthew Robichaud Submitted of Earth Sciences Dalhousie University, Halifax, Nova Scotia March 2006 #12;jt Dalhousie University Department of Earth Sciences Halifax, Nova Scotia Canada B3H 3|5 (902) 494-2358 FAX 1902) 494-f>8«9 DATE

Beaumont, Christopher

398

HOW TO PROVIDE AUTOMATIC FIRE PROTECTION FOR YOUR BUILDING.  

ERIC Educational Resources Information Center

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)

Honeywell, Inc., Minneapolis, Minn.

399

The Radcliffe Institute: Is There Life After Birth?  

ERIC Educational Resources Information Center

Purposes and program of the Radcliffe Institute are described from its creation in 1960 as "one effort to change the social climate for women" by offering part-time fellowships so that talented women might again become "visible professionally" to its present increasingly professional orientation. (JT)

Stent, Angela

1975-01-01

400

Evolution of parental care driven by mutual reinforcement of parental food provisioning  

E-print Network

branch of theory that has stimulated much empirical work on mammals, birds, fishes and invert- ebrates (e competition Andy Gardner1,* and Per T. Smiseth2 1 Department of Zoology, University of Oxford, South Parks, West Mains Road, Edinburgh EH9 3JT, UK In mammals, altricial birds and some invertebrates, parents care

Reece, Sarah

401

Geometric Simulation of Perovskite Frameworks with Jahn-Teller Distortions: Applications to the Cubic Manganites  

E-print Network

Geometric Simulation of Perovskite Frameworks with Jahn-Teller Distortions: Applications December 2005; published 7 August 2006) A new approach is presented for modeling perovskite frameworks in the presence of disorder in networks of corner-shared JT-distorted octahedra such as the perovskites. Geometric

Thorpe, Michael

402

Quadrupolar Ordering in LaMnO3 Revealed from Scattering Data and Geometric Modeling A. Sartbaeva, S. A. Wells, and M. F. Thorpe  

E-print Network

in the crystallographic average structure. The ordering of these quadrupoles is important in determining the properties ordering pattern. In manganite perovskites and layered cuprates [2­5], strong Jahn-Teller (JT) coupling [5­12] gives rise to a variety of interesting magnetic, electronic, and structural phenomena such as charge

Thorpe, Michael

403

Is The Modern Lease a Contract or a Conveyance?--A Historical Inquiry  

ERIC Educational Resources Information Center

Argues that "contrary to conventional wisdom, current landlord-tenant law is modern, commercial, and already grounded in contract doctrine." Discusses the origins of the doctrines most frequently cited as illustrations of leasings property basis and redevelops the role of property law in adjudicating leasing disputes. (JT)

Siegel, Stephen A.

1975-01-01

404

Supporting Information for: Mobilisation of arsenic from bauxite residue (red mud) affected soils: Effect  

E-print Network

, William M. Mayes3 , Caroline L. Peacock1 , David A. Polya4 , Paul R Lythgoe4 , Alizée P. Lehoux1 3435259 2 School of Civil Engineering, University of Leeds, Leeds, LS2 9JT, UK. 3 Centre for Environmental. Samples were frozen (-20°C) and transported to the synchrotron on dry ice. Solutions of sodium arsenate

Burke, Ian

405

Copyright 2000 by the Genetics Society of America Multigeneration Maximum-Likelihood Analysis Applied to  

E-print Network

Applied to Mutation-Accumulation Experiments in Caenorhabditis elegans Peter D. Keightley* and Thomas M. Bataillon *Institute of Cell, Animal and Population Biology, University of Edinburgh, Edinburgh EH9 3JT to estimate genomic mutation rates (U) and average homozygous mutation effects (s) from mutation

Bataillon, Thomas

406

A Couples Group of Medical Students  

ERIC Educational Resources Information Center

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)

Porter, Kenneth; And Others

1976-01-01

407

AXIOMS, ALGEBRAS, AND TOPOLOGY Brandon Bennett  

E-print Network

of Leeds Leeds LS2 9JT, United Kingdom brandon@comp.leeds.ac.uk Ivo D¨untsch Department of Computer by the Engineering and Physical Sciences Research Coun- cil of the UK, under grant EP/D002834/1. I. D¨untsch

Düntsch, Ivo

408

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...

409

INCREASED LEAD ABSORPTION AND LEAD POISONING  

E-print Network

in paint peeling from indoor surfaces is well Jppreciated, lead-based paint on exterior surfaces Jccessible to children may also bit the Dust and dirt may constitute reported in ml~rograms ~er 100 ml whole blood. extertur surfJt:es or by JUto c:missions. Smelter dust may

410

Received 11 April 2003 Accepted 8 July 2003  

E-print Network

. falciparum data show that expected total lifetime transmission of the parasite is maximized in young children of Edinburgh, Edinburgh EH9 3JT, UK Malaria parasites cause much morbidity and mortality to their human hosts. From our evolutionary per- spective, this is because virulence is positively associated with parasite

Read, Andrew

411

Dynamic characteristics of ocean platform with mooring system  

E-print Network

Dynamic characteristics of ocean platform with mooring system Aichun Feng ­af2g10@soton.ac.uk-, supervised by Dr Z. Chen and Prof J.T. Xing Fluid Structure Interactions Research Group FSI Away Day 2011 · Offshore structures are main tools exploiting natural resources from ocean and normally have three main

Sóbester, András

412

University Counselor: Lore, Logic and Logistics  

ERIC Educational Resources Information Center

Suggestions of ways university counsel can serve the client better with greater hourly productivity. Lists advantages of attorneys working from one office and under the president (not the board), describes some systems for recordkeeping (docketing, citation file, policy orders, etc.), and outlines an approach to preventive law. (JT)

Sensenbrenner, Richard J.

1974-01-01

413

4 th World Congress on Industrial Process Tomography, Aizu, Japan A boundary element approach for realtime monitoring and control from  

E-print Network

Institute for Health, University of Leeds, Leeds, LS2 9JT, UK ABSTRACT Electrical tomography techniques in electrical resistance tomography. To illustrate the proposed methods a simple simulation study for solving electrical tomography problems using the FEM. Despite the generality of the FEM, and its

Aykroyd, Robert G.

414

World Congress on Industrial Process Tomography, Aizu, Japan A boundary element approach for real-time monitoring and control from  

E-print Network

Institute for Health, University of Leeds, Leeds, LS2 9JT, UK ABSTRACT Electrical tomography techniques in electrical resistance tomography. To illustrate the proposed methods a simple simulation study for solving electrical tomography problems using the FEM. Despite the generality of the FEM, and its

Aykroyd, Robert G.

415

Poor Reception for Broadcast Graduates  

ERIC Educational Resources Information Center

Noting reports of 17,251 college juniors and seniors majoring in radio-television broadcasting and only 141,500 employees now working in the field, the author discusses the causes and implications including the value of the radio-TV degree and the cost of broadcast education. (JT)

Carlisle, Robert D. B.

1976-01-01

416

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)

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.

Piotrowska, A.; Chorowski, M.

2008-03-01

417

n er a I Society Profile -ACI  

E-print Network

the American Coocrete Institute (ACl lrJtClnational) Aulumn, 1996 Volume 1'1, Issue 4 CllartiliOO as ate the (leflral j1UbliCby disseminatiil(l information 00 OOOCletB. IrnJeed, ACI Intematiorlal's motto desuitJes l produc- ers, and government and h i ~he! ooocation. ACl lnterrratiooai members may take part in !he

418

Princeton Plasma Physics Laboratory NSTX Experimental Proposal  

E-print Network

for NSTX: (1) pressure-driven start-up by ECH (CDX-U scenario), (2) RF ionization + PF induction (JT-60U preionization and outboard PF coil induction only [Y. Takase, et al., IAEA Fusion Energy Conf. (Vilamoura, 2004 of the large heating power provided by reconnection, this scenario is suitable for forming a high- ST plasma

Princeton Plasma Physics Laboratory

419

Two Steps Backward: Report on the Economic Status of the Profession, 1974-75  

ERIC Educational Resources Information Center

Presents the annual survey of faculty compensation containing data for each of the 1,548 colleges and universities reporting and national summary tables with breakdowns by academic rank, sex, geographical area, and type of institution (public, private, church related). Includes information on tenure and on status of women faculty members. (JT)

AAUP Bulletin, 1975

1975-01-01

420

Applied Mathematical Models in Human Physiology September 12, 2003  

E-print Network

Applied Mathematical Models in Human Physiology September 12, 2003 J.T. Ottesen, M.S. Olufsen is to study mathematical models of human physiology. The book is a result of work by Math­ Tech (in Copenhagen research publications contributing to the understanding of human physiology. This book contains

Olufsen, Mette Sofie

421

The age and evolution of an antiviral resistance mutation in Drosophila melanogaster  

E-print Network

The age and evolution of an antiviral resistance mutation in Drosophila melanogaster Jenny Bangham's Buildings, West Mains Road, Edinburgh EH9 3JT, UK What selective processes underlie the evolution of parasites and their hosts? Arms-race models propose that new host-resistance mutations or parasite counter

Jiggins, Francis

422

Comparative Study of OFCDM and MC-DS-CDMA with MMSE MUD and Iterative Decoding  

E-print Network

are converted into an OFCDM frame using the Inverse Fast Fourier Transform (IFFT) and followed by the insertion, Timothy O'Farrell Institute of Integrated Information Systems (I3S) School of Electronic and Electrical Engineering, University of Leeds, LS2 9JT, UK eenajma@leeds.ac.uk Abstract - In this contribution we study

Haddadi, Hamed

423

ATMOSPHERIC CONCENTRATIONS OF AMMONIA AND AMMONIUM AT AN AGRICULTURAL SITE IN THE SOUTHEAST UNITED STATES: JOURNAL ARTICLE  

EPA Science Inventory

NRMRL-RTP-P-611 Robarge, W.P., Walker*, J.T., McCulloch, R.B., and Murray, G. Atmospheric Concentrations of Ammonia and Ammonium at an Agricultural Site in the Southeast United States. Atmospheric Environment 36 (10):1661-1674 (2002). 06/18/2001 In this study, we present app...

424

A Genotypic and Histopathological Study of a Large Dutch Kindred with Hyperparathyroidism-Jaw Tumor Syndrome  

Microsoft Academic Search

Familial primary hyperparathyroidism is the main feature of 2 familial endocrine neoplasia syndromes: multiple endocrine neopla- sia type 1 (MEN 1) and hyperparathyroidism-jaw tumor syndrome (HPT-JT). The latter is a recently described syndrome that has been associated with ossifying fibroma of the jaw and various types of renal lesions, including benign cysts, Wilms' tumor, and hamartomas. To further illustrate the

CAROLA JOSE HAVEN; FUNG KI WONG; EVELINE W. C. M. VAN DAM; ROB VAN DER LUIJT; CHRISTI VAN ASPEREN; JOKE JANSEN; CARLA ROSENBERG; MIREILLE DE WIT; JANINE ROIJERS; JO HOPPENER; CORNELIS J. LIPS; CATHARINA LARSSON; BIN TEAN TEH; HANS MORREAU

2010-01-01

425

Pressure effects on NaMnF4: Structural correlations and Jahn-Teller effect from crystal-field spectroscopy  

E-print Network

Cantabria, Santander 39005, Spain 2 Departamento de Qui´mica Inorga´nica, Universidad de la Laguna, Tenerife. Their variation with pressure reveals that the JT energy does not change significantly with pressure: EJT / P 0 energies and their pressure shift are explained in terms of local structural changes within the MnF6 3

Rodríguez, Fernando

426

Performance of a counterflow heat exchanger with heat loss through the wall at the cold end  

Microsoft Academic Search

The performance of high effectiveness heat exchangers used in cryogenic systems is strongly controlled by irreversibilities such as longitudinal heat conduction and heat leak from ambient. In all heat exchanger analyses, it is assumed that no heat is lost through the heat exchanger walls. In the case of small J-T refrigerators such as microminiature refrigerators, the heat exchanger cold end

S Pradeep Narayanan; G Venkatarathnam

1999-01-01

427

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

PubMed

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

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

428

G. Vlad 10th ITPA MHD Topical Group Meeting at IPP-Garching 10th -12th October 2007 1 Progress and plans for the  

E-print Network

G. Vlad 10th ITPA MHD Topical Group Meeting at IPP-Garching 10th -12th October 2007 1 Progress. Takechi (JT-60U) W.W. Heidbrink, M.A. Van Zeeland (DIII-D) #12;G. Vlad 10th ITPA MHD Topical Group Meeting (but particle nonlinearities fully retained) #12;G. Vlad 10th ITPA MHD Topical Group Meeting at IPP

Vlad, Gregorio

429

Fast Colon Centreline Calculation using Optimised 3D Topological Thinning  

E-print Network

Fast Colon Centreline Calculation using Optimised 3D Topological Thinning Robert J.T. Sadleir;ABSTRACT Topological thinning can be used to accurately identify the central path through a computer model to simplify the task of navigation within the colon model. Unfortunately standard topological thinning

Whelan, Paul F.

430

Dynamics of Abelian Higgs vortices in the near Bogomolny regime  

Microsoft Academic Search

The aim of this paper is to give an analytical discussion of the dynamics of the Abelian Higgs multi-vortices whose existence was proved by Taubes ([JT82]). For a particular value of a parameter of the theory, ?, called the Higgs self-coupling constant, there is no force between two vortices and there exist static configurations corresponding to vortices centred at any

D. Stuart

1994-01-01

431

Temperature instability comparison of micro- and mesoscale Joule-Thomson cryocoolers employing mixed refrigerants  

NASA Astrophysics Data System (ADS)

Previously we demonstrated cryogenic cooling in a Joule-Thomson (JT) microcryocooler (MCC) with mixed refrigerants operating at pressure ratios of 16:1 that achieved stable temperatures of 140 K, with transient temperatures down to 76 K, with precooling of the refrigerant to 240 K. Pre-cooling improves the minimum enthalpy difference, (?hhT)min compared with that of pure fluids. Micro-scale compressors have been unavailable to meet 16:1 ratios. By reducing the ratio to 4:1, mini-compressors become viable in the near term. Utilizing mixed refrigerants optimized for 4:1 pressure ratios we compare the performance stability of this micro-JT employing a 25 mm long multichannel glass fiber heat exchanger (outer low-pressure capillary ID/OD=536 ?m/617 ?m, inner high-pressure channels ID/OD=75 ?m/125 ?m) with a scaled up (meso-scopic) version employing a 20 cm long single channel stainless steel heat exchanger (outer low pressure channel ID/OD=580 ?m/760 ?m, inner high pressure channel ID/OD=150 ?m/266 ?m). This easy to fabricate and modify meso-scale version was fabricated to investigate the temperature instabilities of mixed refrigerants for similar operating conditions but for proportionally higher flows of ~ 30 cm3/min compared with ~ 10 cm3/min. We compare measured pressures, flow rates, temperatures, and stabilities for both micro- and meso-JT cryocoolers to better understand the causes for the temperature instabilities within the micro-JT cryocooler. KEYWORDS: Cryocooler, Joule-Thomson, microcryocooler, micro-JT, mixed

Bradley, Peter; Radebaugh, Ray; Lewis, R. J.; Lin, M.-H.; Lee, Y. C.

2012-06-01

432

New imidazolidinic bioisosters: potential candidates for antischistosomal drugs.  

PubMed

The emergence of strains of Schistosoma resistant to praziquantel has drawn attention to the search for new schistosomacide drugs. Imidazolidinic derivatives have performed outstandingly against adult S. mansoni worms when evaluated in vitro. The molecular modification of imidazolidine by way of bioisosteric replacement gives rise to variations in its biological response. This study verifies the potential of substituent groups in the derivatives (Z)3-benzyl-5-(2-fluoro-benzylidene)-imidazolidine-2,4-dione NE4, 3-benzyl-5-(4-chloro-arylazo)-4-thioxo-imidazolidin -2-ona PT5, 3-benzyl-5-(3-fluoro-benzylidene)-1-methyl-2-thioxo-imidazolidin-4-one JT53; 3-benzyl-1-methyl-5-(4-methyl-benzylidene)-2-thioxo-imidazolidin-4-one JT63; 3-benzyl-1-methyl-5-(4-methoxi-benzylidene)-2-thioxo -imidazolidin-4-one JT68; 3-(4-chloro-benzyl)-1-methyl-5-(4-methoxi-benzylidene)-2-thioxo-imidazolidin-4-one JT69; 3-(4-phenyl-benzyl)-1-methyl-5-(4-methoxi-benzylidene)-2-thioxo-imidazolidin-4-one JT72 by determining the viability in vitro of adult S. mansoni worms in the presence of these derivatives. The susceptibility of the worms obtained from mice and kept in culture in the presence of different concentrations was determined by way of schistosomacide kinetic, observed every 24 h over a period of eight days. The results show that the worms were more sensitive to the PT5 derivative at a concentration of 58 microM which killed 100% of the worms after 24 h of contact, also giving rise to alterations in the tegument surface of the worms with the formation of bubbles and peeling. These observations suggest a strong electronic contribution of the arylazo grouping in the biological response. PMID:17308788

Pitta, Maira G R; Silva, Andra C A; Neves, Juliana Kelle A L; Silva, Poliana G; Irmo, Joo I; Malagueo, Elizabeth; Santana, Jos V; Lima, Maria C A; Galdino, Suely L; Pitta, Ivan R; Albuquerque, Mnica C P A

2006-09-01

433

Decorated Shastry-Sutherland lattice in the spin-(1)/(2) magnet CdCu2(BO3)2  

NASA Astrophysics Data System (ADS)

We report the microscopic magnetic model for the spin-1/2 Heisenberg system CdCu2(BO3)2, one of the few quantum magnets showing the 1/2-magnetization plateau. Recent neutron diffraction experiments on this compound [M. Hase , Phys. Rev. BPLRBAQ0556-280510.1103/PhysRevB.80.104405 80, 104405 (2009)] evidenced long-range magnetic order, inconsistent with the previously suggested phenomenological magnetic model of isolated dimers and spin chains. Based on extensive density functional theory band structure calculations, exact diagonalizations, quantum Monte Carlo simulations, third-order perturbation theory as well as high-field magnetization measurements, we find that the magnetic properties of CdCu2(BO3)2 are accounted for by a frustrated quasi-2D magnetic model featuring four inequivalent exchange couplings: the leading antiferromagnetic coupling Jd within the structural Cu2O6 dimers, two interdimer couplings Jt1 and Jt2, forming magnetic tetramers, and a ferromagnetic coupling Jit between the tetramers. Based on comparison to the experimental data, we evaluate the ratios of the leading couplings Jd : Jt1 : Jt2 : Jit = 1 : 0.20 : 0.45 : -0.30, with Jd of about 178 K. The inequivalence of Jt1 and Jt2 largely lifts the frustration and triggers long-range antiferromagnetic ordering. The proposed model accounts correctly for the different magnetic moments localized on structurally inequivalent Cu atoms in the ground-state magnetic configuration. We extensively analyze the magnetic properties of this model, including a detailed description of the magnetically ordered ground state and its evolution in magnetic field with particular emphasis on the 1/2-magnetization plateau. Our results establish remarkable analogies to the Shastry-Sutherland model of SrCu2(BO3)2, and characterize the closely related CdCu2(BO3)2 as a material realization for the spin-1/2 decorated anisotropic Shastry-Sutherland lattice.

Janson, O.; Rousochatzakis, I.; Tsirlin, A. A.; Richter, J.; Skourski, Yu.; Rosner, H.

2012-02-01

434

An Extracellular Matrix Molecule, Secreted by the Epithelial-Mesenchymal Transition is Associated With Lymph Node Metastasis of Thyroid Papillary Carcinoma  

PubMed Central

Background: Papillary thyroid carcinoma often has lymph node metastasis, compared with follicular thyroid carcinoma. The study showed that epithelial-mesenchymal transition occurs in carcinoma cells during the first stage of metastasis, where some extracellular matrix molecules are secreted in large quantities. Sialic acid carried by fibronectin as the antigen of the monoclonal antibody (MoAb) JT-95, was detected in 90% of papillary thyroid carcinoma cases, and in a few follicular thyroid carcinomas, in the extracellular matrix of thyroid carcinoma cells. Objectives: The current study was conducted to investigate the association between increasing the number of extracellular matrix molecules, fibronectin, and lymph node metastasis. We also co-cultured a thyroid carcinoma cell line and lymphocyte cell line, with and without MoAb JT-95, in order to investigate the mechanism of cell to cell interaction. Patients and Methods: Immunostaining with JT-95 was performed in 45 papillary thyroid carcinoma cases, and 20 follicular type tumors, to investigate the association between the quantity of fibronectin expression and the frequency of lymph node metastasis. The thyroid carcinoma cell line (SW1736), which secreted fibronectin, and the B cell-lymphoma cell line (Daudi), which held integrin on the cell surface, were co-cultured to observe the adhesion of cells to each other. The SW1736 cell line, pretreated with JT-95, was also co-cultured with the Daudi cell line. Results: There were 39 cases with lymph node metastasis in 59 malignant tumors, and 0 cases in 6 benign follicular type tumors. The staining scores by JT-95 of the 39 tumors with lymph node metastasis were 5+ in eight cases and 6+ in 31 cases. On the other hand, the scores of 20 malignant tumors without lymph node metastasis were < 4+ in all of the cases. In the co-cultured assay, numerous adhesions were observed between the SW1736 and Daudi cells. In contrast, the inhibition of adherences was observed in proportion to the concentrations of JT-95. Conclusions: Increased fibronectin expression in thyroid malignancies is correlated with lymph node metastasis. PMID:24696692

Takeyama, Hiroshi; Manome, Yoshinobu; Fujioka, Kouki; Tabei, Isao; Nogi, Hiroko; Toriumi, Yasuo; Kato, Kumiko; Kamio, Makiko; Imawari, Yoshimi; Kinoshita, Satoki; Akiba, Naoshi; Uchida, Ken; Morikawa, Toshiaki

2014-01-01

435

Effect of forward motion on engine noise  

NASA Technical Reports Server (NTRS)

Methods used to determine a procedure for correcting static engine data for the effects of forward motion are described. Data were analyzed from airplane flyover and static-engine tests with a JT8D-109 low-bypass-ratio turbofan engine installed on a DC-9-30, with a CF6-6D high-bypass-ratio turbofan engine installed on a DC-10-10, and with a JT9D-59A high-bypass-ratio turbofan engine installed on a DC-10-40. The observed differences between the static and the flyover data bases are discussed in terms of noise generation, convective amplification, atmospheric propagation, and engine installation. The results indicate that each noise source must be adjusted separately for forward-motion and installation effects and then projected to flight conditions as a function of source-path angle, directivity angle, and acoustic range relative to the microphones on the ground.

Blankenship, G. L.; Low, J. K. C.; Watkins, J. A.; Merriman, J. E.

1977-01-01

436

A 0.63 micrometers polarization maintaining optical fiber cable  

NASA Astrophysics Data System (ADS)

Polarization maintaining single mode optical fiber cable was developed with negligible small loss increase and high crosstalk for optical interferometric measuring system of JT-60 (Japan Atomic Energy Research Institute TOKAMAK-60). Optical interferometric measuring system is required for high precise non-contact measurement of distance or vibration. Polarization maintaining optical fiber enabled to measure them in extremely high electromagnetic field of JT-60. Developed cable is flame-resistant non-metallic type complex 16 fiber cable for 0.6 micron use, that has 8 polarization maintaining optical fibers (stress applying, called PANDA fiber) and 8 single mode optical fibers. This paper shows the experimental result and the possibility of manufacturing polarization maintaining single mode optical fiber cable for 0.63 micron use.

Yoshida, H.; Kikuchi, Y.; Tamaki, Y.

1986-11-01

437

Vacuum insulation of the high energy negative ion source for fusion application  

SciTech Connect

Vacuum insulation on a large size negative ion accelerator with multiple extraction apertures and acceleration grids for fusion application was experimentally examined and designed. In the experiment, vacuum insulation characteristics were investigated in the JT-60 negative ion source with >1000 apertures on the grid with the surface area of {approx}2 m{sup 2}. The sustainable voltages varied with a square root of the gap lengths between the grids, and decreased with number of the apertures and with the surface area of the grids. Based on the obtained results, the JT-60SA (super advanced) negative ion source is designed to produce 22 A, 500 keV D{sup -} ion beams for 100 s.

Kojima, A.; Hanada, M.; Inoue, T.; Watanabe, K.; Taniguchi, M.; Kashiwagi, M.; Umeda, N.; Tobari, H. [Japan Atomic Energy Agency, Naka, Ibaraki 311-0193 (Japan); Hilmi, A.; Kobayashi, S.; Yamano, Y. [Saitama University, Saitama, Saitama-ken, 338-8570 (Japan); Grisham, L. R. [Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)

2012-02-15

438

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

SciTech Connect

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

Sahu, A. K., E-mail: ajitsahu@seemantaengg.ac.in [Seemanta Engineering College, Jharpokharia, Mayurbhanj-757086, Odisha (India); Rout, G. C. [School of Applied Sciences (Physics), KIIT University, Bhubaneswar-7561024 (India)

2014-04-24

439

Development of a microminiature sorption cooler  

NASA Technical Reports Server (NTRS)

The development of a microcooler for operations below 80 K, for low temperature electronic devices requiring small cooling powers of the order of 10 mW is described. A sorption compressor combined with Joule-Thomson (JT) expansion was selected for miniaturization. The advantage of the system is considered to be its absence of moving parts, with the exception of the check valves. This facilitates the scaling down of the system, minimizes interferences and contributes to a long lifetime. The requirements for small scale cooling of low temperature electronics are listed. The sorption compressor and the JT expansion are described. A parameter study is reviewed together with the scaling of the sorption compressor.

Burger, Johannes; Holland, Harry; terBrake, Marcel; Rogalla, Horst; Wade, Larry

1997-01-01

440

Jahn-Teller intersections involving excited states of the F + H2 system: Identification and influence on the reaction system  

NASA Astrophysics Data System (ADS)

While a wealth of studies exist on the potential energy surface (PES) for the F + H2 reaction, exploration of the effect of conical intersections (CIs on the corresponding adiabatic PES has only been initiated. In this respect, a recent emphasis on the specific role of the Jahn-Teller (JT) CI between the two lowest states has shown that the adiabatic-to-diabatic transformation (ADT) angle (mixing angle), ?12, between these two states deviates largely from its quantized value of ? for configuration spaces with F close to the H-H system. Hence, investigating the effect of the other CIs present, involving the higher states, on the reactive channel is necessary. In this article, we report for the first time the collinear (2, 3), (3, 4) and (4, 5) JT CIs in this system and also reveal their major effects on ?12, which is instrumental in the diabatization of the PES for the title reaction system.

Das, Anita; Mukhopadhyay, Debasis

2013-02-01

441

Plasma-surface interactions, SOL and divertor physics: Implications for ITER  

E-print Network

) to current tokamaks. 0.0 0.2 0.4 0.6 0.8 0.000 0.001 0.002 0.003 0.004 0.005 AUG C-Mod DIII-D JET JT-60U Te 0.0 0.2 0.4 0.6 0.8 0.000 0.001 0.002 0.003 0.004 0.005 AUG C-Mod DIII-D JET JT-60U Te/R0 ne as well as tritium co-deposition ·Standard models predict ~ stagnant flows in the SOL opposite

442

Parafibromin inhibits cancer cell growth and causes G1 phase arrest  

SciTech Connect

The HRPT2 (hereditary hyperparathyroidism type 2) tumor suppressor gene encodes a ubiquitously expressed 531 amino acid protein termed parafibromin. Inactivation of parafibromin predisposes one to the development of HPT-JT syndrome. To date, the role of parafibromin in tumorigenesis is largely unknown. Here, we report that parafibromin is a nuclear protein that possesses anti-proliferative properties. We show that overexpression of parafibromin inhibits colony formation and cellular proliferation, and induces cell cycle arrest in the G1 phase. Moreover, HPT-JT syndrome-derived mutations in HRPT2 behave in a dominant-negative manner by abolishing the ability of parafibromin to suppress cell proliferation. These findings suggest that parafibromin has a critical role in cell growth, and mutations in HRPT2 can directly inhibit this role.

Zhang Chun [Laboratory of Cancer Genetics, Van Andel Research Institute, Grand Rapids, MI 49503 (United States); Kong Dong [Laboratory of Mammalian Developmental Genetics, Van Andel Research Institute, Grand Rapids, MI 49503 (United States); Tan, M.-H. [Laboratory of Cancer Genetics, Van Andel Research Institute, Grand Rapids, MI 49503 (United States); Department of Medical Oncology, National Cancer Center (Singapore); Pappas, Donald L. [Laboratory of Chromosome Replication, Van Andel Research Institute, Grand Rapids, MI 49503 (United States); Wang, P.-F. [Laboratory of Cancer Genetics, Van Andel Research Institute, Grand Rapids, MI 49503 (United States); Chen, Jindong [Laboratory of Cancer Genetics, Van Andel Research Institute, Grand Rapids, MI 49503 (United States); Farber, Leslie [Laboratory of Cancer Genetics, Van Andel Research Institute, Grand Rapids, MI 49503 (United States); Zhang Nian [Laboratory of Mammalian Developmental Genetics, Van Andel Research Institute, Grand Rapids, MI 49503 (United States); Koo, H.-M. [Laboratory of Cancer Pharmacogenetics, Van Andel Research Institute, Grand Rapids, MI 49503 (United States); Weinreich, Michael [Laboratory of Chromosome Replication, Van Andel Research Institute, Grand Rapids, MI 49503 (United States); Williams, Bart O. [Laboratory of Cell Signaling and Carcinogenesis, Van Andel Research Institute, Grand Rapids, MI 49503 (United States); Teh, B.T. [Laboratory of Cancer Genetics, Van Andel Research Institute, Grand Rapids, MI 49503 (United States)]. E-mail: bin.teh@vai.org

2006-11-10

443

Investigations on two-phase heat exchanger for mixed refrigerant Joule-Thomson cryocooler  

NASA Astrophysics Data System (ADS)

The design of the recuperative heat exchanger used to pre-cool the refrigerant mixture prior to J-T expansion is crucial for the efficient operation of the mixed refrigerant Joule- Thomson (MR J-T) cryocooler. The multi-component non-azeotropic refrigerant mixture undergoes boiling and condensation heat transfer simultaneously in the heat exchanger. Therefore, it is important to analyze the performance of the heat exchanger in terms of temperature distribution with respect to the mixture of gases used. In the present work, temperature measurements are carried out at the ends of the heat exchanger for high pressure stream, while eight sensors are installed at equal distance along the length of heat exchanger to measure temperature of low pressure stream. The paper reports variation in heat transfer coefficient along the length of the heat exchanger. The variation is discussed with respect to temperature distribution across the length and changes in thermo-physical properties of the gas mixture.

Ardhapurkar, Purushottam; Sridharan, Arunkumar; Atrey, Milind

2012-06-01

444

Gifford-McMahon/Joule-Thomson Refrigerator Cools to 2.5 K  

NASA Technical Reports Server (NTRS)

A compact refrigerator designed specifically for cooling a microwave maser low-noise amplifier is capable of removing heat at a continuous rate of 180 mW at a temperature of 2.5 K. This refrigerator is a combination of (1) a commercial Gifford-McMahon (GM) refrigerator nominally rated for cooling to 4 K and (2) a Joule-Thomson (J-T) circuit. The GM refrigerator pre-cools the J-T circuit, which provides the final stage of cooling. The refrigerator is compact and capable of operating in any orientation. Moreover, in comparison with a typical refrigerator heretofore used to cool a maser to 4.5 K, this refrigerator is simpler and can be built at less than half the cost.

Britcliffe, Michael; Fernandez, Jose; Hanson, Theodore

2005-01-01

445

QUANTITATIVE TESTS OF ELMS AS INTERMEDIATE N PEELING-BALOONING MODES  

SciTech Connect

A271 QUANTITATIVE TESTS OF ELMS AS INTERMEDIATE N PEELING-BALOONING MODES. Several testable features of the working model of edge localized modes (ELMs) as intermediate toroidal mode number peeling-ballooning modes are evaluated quantitatively using DIII-D and JT-60U experimental data and the ELITE MHD stability code. These include the hypothesis that ELM sizes are related to the radial widths of the unstable MHD modes, the unstable modes have a strong ballooning character localized in the outboard bad curvature region, and ELM size generally becomes smaller at high edge collisionality. ELMs are triggered when the growth rates of the unstable MHD modes become significantly large. These testable features are consistent with many ELM observations in DIII-D and JT-60U discharges.

LAO,LL; SNYDER,PB; LEONARD,AW; OIKAWA,T; OSBORNE,TH; PETRIE,TW; FERRON,JR; GROEBNER,RJ; HORTON,LD; KAMADA,Y; MURAKAMI,M; SAARELMA,S; STJOHN,HE; TURNBULL,AD; WILSON,HR

2003-03-01

446

Jahn-Teller effect in the electronic Raman scattering of Co2+ in MgO  

NASA Astrophysics Data System (ADS)

We employ a model with only a few phonon frequencies to describe the Jahn-Teller (JT) interaction. If the maximum occupation number for each phonon is small (a maximum of two in this work) the system Hamiltonian can be diagonalized numerically. After an adequate choice of the frequencies and JT coefficients of the model we compare the resulting intensity for electronic Raman scattering of Co2+:MgO with the linewidth calculated in another work [L. T. Peixoto and M. E. Foglio, Phys. Rev. B 32, 2596 (1985) in which Green's functions were truncated and a continuum of phonon frequencies was employed. The present calculation produces additional structure which also appears in the experimental spectrum.

Peixoto, Luciano T.; Foglio, Mario E.

1986-02-01

447

Hydraulic characteristics and thermal counterflow in helium II forced flow through orifice plates  

NASA Astrophysics Data System (ADS)

The purpose of the present research is to measure and anlyze the temperature changes and the pressure difference variations through orifice plates in superfluid helium bellows pump through a 1 m long, 73 mm inner diameter experimental channel containing Reynolds number is between 3.0 X 106 and 1.2 X 107. The hydraulic characteristics for adiabatic forced flow He II are examined by comparing with measured pressure drops across the orifice plates to correlations for classical fluids at high Reynolds number. The temperature rise through the orifice plate due to the Joule-Thomson (JT) effect in He II forced flow was also measured. Results are compared to the previous results of the experiment with the 10% orifice and expected temperature changes based on known values for the JT Coefficient to investigate the effect of He II thermal counterflow through the orifice.

Kim, Hyung Jin; Van Sciver, Steven

2012-06-01

448

Dynamic PID loop control  

SciTech Connect

The Horizontal Test Stand (HTS) SRF Cavity and Cryomodule 1 (CM1) of eight 9-cell, 1.3GHz SRF cavities are operating at Fermilab. For the cryogenic control system, how to hold liquid level constant in the cryostat by regulation of its Joule-Thompson JT-valve is very important after cryostat cool down to 2.0 K. The 72-cell cryostat liquid level response generally takes a long time delay after regulating its JT-valve; therefore, typical PID control loop should result in some cryostat parameter oscillations. This paper presents a type of PID parameter self-optimal and Time-Delay control method used to reduce cryogenic system parameters oscillation.

Pei, L.; Klebaner, A.; Theilacker, J.; Soyars, W.; Martinez, A.; Bossert, R.; DeGraff, B.; Darve, C.; /Fermilab

2011-06-01

449

Dynamic PID loop control  

E-print Network

The Horizontal Test Stand (HTS) SRF Cavity and Cryomodule 1 (CM1) of eight 9-cell, 1.3GHz SRF cavities are operating at Fermilab. For the cryogenic control system, how to hold liquid level constant in the cryostat by regulation of its Joule-Thompson JT-valve is very important after cryostat cool down to 2.0 K. The 72-cell cryostat liquid level response generally takes a long time delay after regulating its JT-valve; therefore, typical PID control loop should result in some cryostat parameter oscillations. This paper presents a type of PID parameter self-optimal and Time-Delay control method used to reduce cryogenic system parameters' oscillation.

Pei, L; Theilacker, J; Soyars, W; Martinez, A; Bossert, R; DeGraff, B; Darve, C

2012-01-01

450

Design of a valved moving magnet type linear compressor for a Joule-Thomson cryocooler  

NASA Astrophysics Data System (ADS)

For temperatures around 4-6 K, Joule-Thomson (J-T) cryocoolers can achieve a higher efficiency than Stirling or pulse tube cryocoolers thus have been widely used in space. It is crucial for a J-T compressor to obtain a relatively high pressure ratio. With this concept, a valved moving magnet type linear compressor has been designed. This paper describes the design method and component structure of the linear compressor in detail. The electromagnetic force of linear motor, stiffness and stress distribution of flexure springs were calculated based on finite element method (FEM). System resonance was specially considered to achieve a high efficiency, and system vibration and heat dissipation problems were discussed. The design goal of the linear compressor is to achieve an efficiency of 80% and a lifetime longer than 5 years.

Wang, W. W.; Wang, L. Y.; Gan, Z. H.

2014-01-01

451

The life cycle of Contracaecum osculatum (Rudolphi, 1802) sensu stricto (Nematoda, Ascaridoidea, Anisakidae) in view of experimental infections  

Microsoft Academic Search

Hatched, ensheathed third-stage larvae ofContracaecum osculatum, 300320 m long, were shown to be infective to copepods, to nauplius larvae of {jtBalanus} and to small specimens of fishes (sticklebacks, 0-group eelpout). Other fishes such as gobies and small flatfishes became infected by ingesting infected crustaceans. Cod were infected by being given infected small fishes. In the crustacean paratenic hosts, little growth

Marianne Kie; H.-P. Fagerholm

1995-01-01

452

Old Toroidal Gyrofluid Equations The equations used in the nonlinear simulations in Chapter 4 are briefly summarized  

E-print Network

in Chapter 2, the dynamical equations are: dn dt + r k u k \\Gamma ` 1 + j? 2 ?? r 2 ? ' i! \\Lambda \\Psi + ` 1 2 ?? r 2 ? v \\Psi ' \\Delta rT? = \\Gammai! d (p k + p? + 2\\Psi) ; du k dt + r k (p k + \\Psi) = \\Gamma4 j k i! \\Lambda \\Psi = \\Gamma 2i! d [(3 + š 1i )T k + š 2i T? + n + \\Psi] \\Gamma 2š 1r j! d jT k

Hammett, Greg

453

Forced two-phase cooling of the TPC superconducting solenoid  

NASA Astrophysics Data System (ADS)

The cryogenic tests of the TPC 2-meter diameter superconducting solenoid on a 200 W refrigerator with gas-bearing turbines is described. The solenoid is cooled with two phase helium in forced flow around the superconducting winding. The two-phase helium was circulated using either the J-T circuit flow or a bellows type liquid helium pump. The particular problems associated with running a variable load on a gas-bearing turbine refrigerator are discussed.

Green, M. A.; Barrera, F.; Petersen, H.; Rago, C. E.; Rinta, R. I.; Talaska, D.; Taylor, J. D.; Vanslyke, H.; Watt, R. D.

1983-08-01

454

Clogging of Joule-Thomson Devices in Liquid Hydrogen-Lunar Lander Descent Stage Operating Regime  

Microsoft Academic Search

Joule-Thomson (J-T) devices have been identified as critical components for future space exploration missions. The NASA Constellation Program lunar architecture considers LOX\\/LH2 propulsion for the lunar lander descent stage main engine an enabling technology, ensuring the cryogenic propellants are available at the correct conditions for engine operation. This cryogenic storage system may utilize a Thermodynamic Vent System (TVS) that includes

J. M. Jurns

2010-01-01

455

CLOGGING OF JOULE-THOMSON DEVICES IN LIQUID HYDROGENLUNAR LANDER DESCENT STAGE OPERATING REGIME  

Microsoft Academic Search

Joule-Thomson (J-T) devices have been identified as critical components for future space exploration missions. The NASA Constellation Program lunar architecture considers LOX\\/LH2 propulsion for the lunar lander descent stage main engine an enabling technology, ensuring the cryogenic propellants are available at the correct conditions for engine operation. This cryogenic storage system may utilize a Thermodynamic Vent System (TVS) that includes

J. M. Jurns

2010-01-01

456

Parafibromin is a nuclear protein with a functional monopartite nuclear localization signal  

Microsoft Academic Search

Parafibromin is a nuclear protein with a tumour suppressor role in the development of non-hereditary and hereditary parathyroid carcinomas, and the hyperparathyroidism-jaw tumour (HPT-JT) syndrome, which is associated with renal and uterine tumours. Nuclear localization signal(s), (NLS(s)), of the 61 kDa parafibromin remain to be defined. Utilization of computer-prediction programmes, identified five NLSs (three bipartite (BP) and two monopartite (MP)).

K J Bradley; M R Bowl; S E Williams; B N Ahmad; C J Partridge; A L Patmanidi; A M Kennedy; N Y Loh; R V Thakker

2007-01-01

457

DTP | Toxicology and Pharmacology Branch (TPB)  

Cancer.gov

MacGregor, J.T., Collins, J.M., Sugiyama, Y., Tyson, C.A., Dean, J., Smith, L., Andersen, M., Curren, R.D., Houston, J.B., Kadlubar, F.F., Kedderis, G.L., Krishnan, K., Li, A.P., Parchment, R.E., Thummel, K., Tomaszewski, J.E., Ulrich, R., Vickers, A.E.M., and Wrighton, S.A., 2001.

458

Two cases of multiple ossifying fibromas in the jaws  

PubMed Central

Background The clinicopathologic characteristics of multiple ossifying fibroma (OF) are unclear due to the conditions rarity, making diagnosis challenging. Sporadic multiple OFs must be distinguished from hyperparathyroidism-jaw tumour syndrome (HPT-JT) related OF and other fibro-osseous lesions. Methods Multiple OF cases were identified from ossifying fibroma cases. Clinical data including age, sex, anatomic site, radiographic features, clinical impression, treatment and available follow-up data as well as serum calcium, phosphorus, and parathyroid hormone (PTH) were recorded. GNAS and HRPT2 genetic mutations were examined in the two present cases. Case reports of sporadic multiple ossifying fibroma and HPT-JT-related OF were also reviewed. Results The two present cases were confirmed as sporadic multiple OF, with no genetic GNAS and HRPT2 mutations found. The incidence of sporadic multiple ossifying fibroma was 2.0% (2/102). The total 18 sporadic multiform OF cases were characterized as followed: 13 (72.2%) female; 5 (27.8%) male; mean age 28.6years; 2/16 (11.1%) cases only in the mandible; 4/18 (22.2%) cases only in the maxilla; and 12/18 (66.7%) cases in both the maxilla and mandible. Radiographically, the lesions were radiolucent in 5/18 (27.8%) cases and mixed density in 13/18 (72.2%) cases. Along with 24 cases of HPT-JT related OF were reviewed, sixteen (66.7%) patients were diagnosed with a single lesion, and 8 patients (33.3%) were diagnosed with multiple jaw lesions. Conclusions Sporadic multiple OFs are very rare, but must be distinguished from HPT-JT related OF. We strongly recommend that patients diagnosed with multiple ossifying fibromas receive serum PTH testing and mutation screening of HRPT2. Virtual slides http://www.diagnosticpathology.diagnomx.eu/vs/1194507146115753 PMID:24678936

2014-01-01

459

Papers from the Fifth Regional Meeting of the Chicago Linguistic Society, April 18-19, 1969.  

ERIC Educational Resources Information Center

The topics covered in this volume range over the entire field of linguistics. The authors are: A.L. Becker and D.G. Arms, W.R. Cantrall, G. Cohen, D.J. Darden, A. Davison, D. Elliott and others, J.E. Emonds, B. Fraser, G.M. Green, J.T. Heringer, L.R. Horn, L. Kartunnen, G. Lakoff, R. Lakoff, J.M. Lindholm, V.B. Makkai, J.L. Morgan, Y.C. Morin and

Binnick, Robert I., Ed.; And Others

460

CO 2 elevation improves photosynthetic performance in progressive warming environment in white birch seedlings  

PubMed Central

White birch (Betula paperifera Mash) seedlings were exposed to progressively warming in greenhouses under ambient and elevated CO 2 concentrations for 5 months to explore boreal tree species potential capacity to acclimate to global climate warming and CO 2 elevation. In situ foliar gas exchange, in vivo carboxylation characteristics and chlorophyll fluorescence were measured at temperatures of 26 oC and 37 oC. Elevated CO 2 significantly increased net photosynthetic rate (Pn) at both measurement temperatures, and Pn at 37 oC was higher than that at 26 oC under elevated CO 2. Stomatal conductance (gs) was lower at 37 oC than at 26 oC, while transpiration rate (E) was higher at 37 oC than that at 26 oC. Elevated CO 2 significantly increased instantaneous water-use efficiency (WUE) at both 26 oC and 37 oC, but WUE was markedly enhanced at 37 oC under elevated CO 2. The effect of temperature on maximal carboxylation rate (Vcmax), PAR-saturated electron transport rate (Jmax) and triose phosphate utilization (TPU) varied with CO 2, and the Vcmax and Jmax were significantly higher at 37 oC than at 26 oC under elevated CO 2. However, there were no significant interactive effects of CO 2 and temperature on TPU. The actual photochemical efficiency of PSII (DF/ Fm), total photosynthetic linear electron transport rate through PSII (JT) and the partitioning of JT to carboxylation (Jc) were higher at 37 oC than at 26 oC under elevated CO 2. Elevated CO 2 significantly suppressed the partitioning of JT to oxygenation (Jo/JT). The data suggest that the CO 2 elevation and progressive warming greatly enhanced photosynthesis in white birch seedlings in an interactive fashion. PMID:24555025

Zhang, Shouren; Dang, Qing-Lai

2013-01-01

461

A Layman's Guide to Thrust Engine Development for Super/Hyper Sonic Flight.  

ERIC Educational Resources Information Center

The intention of this paper is to discuss the advances in thrust engines from the initial development of the J58/SR-71 (JT11D-20) of the U.S. Air Force's SR-71 Blackbird to the development of the RAM and SCRAM engines necessary to propel the new generations of high-flying super-speed aircraft. Engineering complexities suggest that the engines and

Thiesse, James L.

462

Vertical extent and dilution of dense jets emanating from a submerged multiport diffuser  

E-print Network

. This thesis investiaates the vertical extent and the dilution of the brine at the Strategic Petroleum Reserve's Bryan Mound diffuser site located off Freeport, Texas. The vertical extent and dilution are measured by acoustic sampling devices and a... for the Strategic Petroleum Reserve project field staff located in Surfside, Texas. TAB LE OF C Q". J Z. "JT S Pace A33 S TRACT . ACKOWLEDGEMENTS TABLE OF CONTENTS rIST QF TABLES. LIST QF FIGURES CHAPTER I. INTPODUCTION. CHAPTER II. LITERATURE Rr...

McLellan, Thomas Neil

1983-01-01

463

Anisotropic orbital occupation and Jahn-Teller distortion of orthorhombic YMnO{sub 3} epitaxial films: A combined experimental and theoretical study on polarization-dependent x-ray absorption spectroscopy  

SciTech Connect

The b-axis oriented orthorhombic YMnO{sub 3} (o-YMnO{sub 3}) epitaxial films on a YAlO{sub 3} (010) substrate were fabricated with pulsed-laser deposition. The anisotropic orbital occupation and Jahn-Teller (JT) distortion of an o-YMnO{sub 3} film were investigated with polarization-dependent x-ray absorption spectra and configuration-interaction multiplet-cluster calculations. A significant energy difference, ?3.8 eV, for the main white line along E//b and E//a in polarization-dependent Mn K-edge spectra of o-YMnO{sub 3} indicates an extraordinary JT distortion and significant anisotropic MnO bonding within the ab plane in the o-YMnO{sub 3} film. Most importantly, although the orbital occupation of 3d electrons in o-YMnO{sub 3} films is almost the same as that in single crystalline o-DyMnO{sub 3}, the JT distortion of o-YMnO{sub 3} films is larger than that of single crystalline o-DyMnO{sub 3}, deduced from the multiplet calculations. We speculate that this JT distortion predominantly contributes to the origin of the cycloidal spin deformation in bulk o-YMnO{sub 3}, because of a suppressed nearest-neighbor superexchange interaction and an enhanced next-nearest-neighbor superexchange interaction. These complementary results provide insight into the origin of the E-type magnetic configuration of o-YMnO{sub 3}.

Haw, Shu-Chih; Chen, Shin-Ann [Department of Engineering and System Science, National Tsing Hua University, 30013 Hsinchu, Taiwan (China) [Department of Engineering and System Science, National Tsing Hua University, 30013 Hsinchu, Taiwan (China); National Synchrotron Radiation Research Center (NSRRC), 101 HsinAnn Road, 30076 Hsinchu, Taiwan (China); Lee, Jenn-Min; Lu, Kueih-Tzu; Lee, Ming-Tao; Pi, Tun-Wen; Chen, Jin-Ming, E-mail: jmchen@nsrrc.org.tw, E-mail: Zhiwei.Hu@cpfs.mpg.de [National Synchrotron Radiation Research Center (NSRRC), 101 HsinAnn Road, 30076 Hsinchu, Taiwan (China)] [National Synchrotron Radiation Research Center (NSRRC), 101 HsinAnn Road, 30076 Hsinchu, Taiwan (China); Lin, Pao-An [Department of Physics, National Tsing Hua University, 30013 Hsinchu, Taiwan (China)] [Department of Physics, National Tsing Hua University, 30013 Hsinchu, Taiwan (China); Lee, Chih-Hao [Department of Engineering and System Science, National Tsing Hua University, 30013 Hsinchu, Taiwan (China)] [Department of Engineering and System Science, National Tsing Hua University, 30013 Hsinchu, Taiwan (China); Hu, Zhiwei, E-mail: jmchen@nsrrc.org.tw, E-mail: Zhiwei.Hu@cpfs.mpg.de [Max Planck Institute for Chemical Physics of Solids, Nthnitzer Strae 40, 01187 Dresden (Germany)] [Max Planck Institute for Chemical Physics of Solids, Nthnitzer Strae 40, 01187 Dresden (Germany)

2014-04-21

464

A finite element method for the one-dimensional extended Boussinesq equations  

Microsoft Academic Search

A new finite element method for Nwogu's (O. Nwogu, ASCE J. Waterw., Port, Coast., Ocean Eng., 119, 618-638 (1993)) one-dimensional extended Boussinesq equations is presented using a linear element spatial discretisation method coupled with a sophisticated adaptive time integration package. The accuracy of the scheme is compared to that of an existing finite difference method (G. Wei and J.T. Kirby,

M. Walkley; M. Berzins

1999-01-01

465

Thermal hydraulics of water cooled divertors  

Microsoft Academic Search

Divertors of several new machines, such as JT-60SU, FIRE, SST-1, ITER-RC and KSTAR, are water-cooled. This paper examines critical thermal hydraulic issues associated with the design of such divertors. The flow direction of coolant in the divertor can be either toroidal or poloidal. A quantitative evaluation shows that the poloidal flow direction is preferred, because the flow rate and pumping

C. B Baxi

2001-01-01

466

Absorption and elimination of formate following oral administration of calcium formate in female human subjects  

E-print Network

Absorption and elimination of formate following oral administration of calcium formate in female human subjects Publisher version available: http://dmd.aspetjournals.org/content/33/2/282.full.pdf Author...s accepted manuscript, available through PubMed Central: http://dmd.aspetjournals.org/content/early/2004/11/16/dmd.104.001289 Full Citation of published version: Hanzlik RP, Fowler SC, Eells JT. Absorption and elimination of formate following oral administration of calcium...

Hanzlik, Robert P.; Fowler, S. C.; Eells, J. T.

2005-02-01

467

Inter-Machine Comparison of Intrinsic Toroidal Rotation  

Microsoft Academic Search

Parametric scalings of the intrinsic (spontaneous, with no external momentum input) toroidal rotation observed on a large number of tokamaks have been combined with an eye toward revealing the underlying mechanism(s) and extrapolation to future devices. The intrinsic rotation velocity has been found to increase with plasma stored energy or pressure in JET, Alcator C-Mod, Tore Supra, DIII-D, JT-60U and

J. E. Rice; A. Ince-Cushman; J. S. deGrassie; L.-G. Eriksson; Y. Sakamoto; A. Scarabosio; A. Bortolon; K. H. Burrell; C. Fenzi-Bonizec; M. J. Greenwald; R. J. Groebner; G. T. Hoang; Y. Koide; E. S. Marmar; A. Pochelon; Y. Podpaly

468

Inter-machine comparison of intrinsic toroidal rotation in tokamaks  

Microsoft Academic Search

Parametric scalings of the intrinsic (spontaneous, with no external momentum input) toroidal rotation observed on a large number of tokamaks have been combined with an eye towards revealing the underlying mechanism(s) and extrapolation to future devices. The intrinsic rotation velocity has been found to increase with plasma stored energy or pressure in JET, Alcator C-Mod, Tore Supra, DIII-D, JT-60U and

J. E. Rice; A. Ince-Cushman; J. S. de Grassie; L.-G. Eriksson; Y. Sakamoto; A. Scarabosio; A. Bortolon; K. H. Burrell; B. P. Duval; C. Fenzi-Bonizec; M. J. Greenwald; R. J. Groebner; G. T. Hoang; Y. Koide; E. S. Marmar; A. Pochelon; Y. Podpaly

2007-01-01

469

MATHEMATICAE An irrational problem  

E-print Network

. Given a topological space hX T i 2 M, an elementary submodel of set theory, we de ne XM to be X \\ M to the \\Long Cantor Set", then X = XM . In JT], we considered the elementary submodel topology, de ned as fol- lows. Let hX Ti be a topological space which is an element of M, an elemen- tary submodel

Tall, Franklin D.

470

concentration c dans la masse pour le charbon b) D'aprs la thorie les courbes n =  

E-print Network

. On traçait alors la courbe de thermoluminescence J0(T) à vitesse de chauffe constante. On reprenait alors l égales, on obtenait une nouvelle courbe de thermoluminescence :Jt,?(T). J'ai d'abord utilisé un énergie incidente). FIG. 2. - Courbes de thermoluminescence Jo et d£t,x après t = 2 minutes d'action de 1

Paris-Sud XI, Université de

471

J T characterized stress fields of surface-cracked metallic liners bonded to a structural backing I. Uniaxial tension  

Microsoft Academic Search

Surface crack-tip stress fields in a tensile loaded metallic liner bonded to a structural backing are developed using a two-parameter JT characterization and elasticplastic modified boundary layer (MBL) finite element solutions. The RambergOsgood power law hardening material model with deformation plasticity theory is implemented for the metallic liner. In addition to an elastic plate backed surface crack liner model, elasticplastic

Shawn A. English; Nagaraj K. Arakere; Phillip A. Allen

2010-01-01

472

1 MW and long pulse operation of Gaussian beam output gyrotron with CVD diamond window for fusion devices  

Microsoft Academic Search

A 110 GHz-Gaussian beam output gyrotron with chemical vapor deposition (CVD) diamond window was developed for electron cyclotron heating and current drive on JT-60U. A stable Gaussian output beam power of 1.0 MW for 2 s was obtained with depressed collector operation. The temperature at the center of the diamond window was stabilized at the ?T?25 K. Gaussian beam output

Atsushi Kasugai; Keishi Sakamoto; Koji Takahashi; Ken Kajiwara; Hiroaki Shoyama; Yukiharu Ikeda; Masaki Tsuneoka; Yoshitaka Ikeda; Tsuneyuki Fujii; Tsuyoshi Kariya; Yoshika Mitsunaka; Tsuyoshi Imai

2001-01-01

473

Development of a rotor wake/vortex model. Volume 2: User's manual for computer program  

NASA Technical Reports Server (NTRS)

The principal objective was to establish a verified rotor wake/vortex model for specific application to fan and compressor rotor-stator interaction and resulting noise generation. A description and flow chart of the Rotor Wake/Vortex Model computer program, a listing of the program, definitions of the input/output parameters, a sample input/output case, and input files for Rotor 55, the JT15D rotor, and Rotor 67, Stage 1 are provided.

Majjigi, R. K.; Gliebe, P. R.

1984-01-01

474

Two Children with Acute Lymphoblastic Leukemia and Jumping Translocations  

Microsoft Academic Search

Jumping translocations (JT) are relatively rare and are associated with poor prognosis. We report two male patients with childhood acute lymphoblastic leukemia (ALL) and abnormal cell lines detected on bone marrow cytogenetics. Diagnostic marrow cytogenetics were not available for either patient. In patient 1, approximately 11 years after diagnosis, cytogenetics revealed a single translocation, t(1;2)(q23;q32), which was followed by translocations

Angela Jarvis; Praveen Sharma; Neville Watson; Arabella Smith

1999-01-01

475

JANUARY 2003 65P I N S K Y A N D K H A I N 2003 American Meteorological Society  

E-print Network

, Vt is the terminal fall velocity of droplets in calm air, ui (i 1, 2, 3) are the velocity components streamlines. As a result of droplet inertia, the droplet velocity flux turns out to be a divergent one within velocity shears as fol- lows from (1): uV u jt i DivV . (1) g x xj i Here V is the droplet flux velocity

Mark, Pinsky

476

A new method to perform quantitative measurement of bronchoscopic images  

Microsoft Academic Search

A new method to perform quantitative measurement of bronchoscopic images. P.K. McFawn, L. Forkert, J.T. Fisher. #ERS Journals Ltd 2001. ABSTRACT: Bronchoscopy is a commonly used clinical tool that provides a direct image of the bronchial lumen. However, bronchoscopy has seen little use as a quantitative measurement tool, mainly because of the wide-angle lens which distorts the image. The present

P. K. McFawn; L. Forkert; J. T. Fisher

2001-01-01

477

UNITED STATES DEPARTMENT OF THE INTERIOR, Oscar L. Chapman, Secretary FISH AND WILDLIFE SERVICE, Albert M. Day, Director  

E-print Network

was the long- line. This type of gear was developed to a great 111 Catch I Palll1ld, 4,574,358 699,014 65.378 3Ipjack (RiJtIl£Wonltl pelamis) _ Bla~k marli.n (Makaira mazara) ::::::::::::::::::::::::::: White marlm miles from which it took over 4.055 tons of tunas, spearfishes, sharks, and other fishes (table 1

478

Large Bandwidth of NbN Phonon-Cooled Hot-Electron Bolometer Mixers on Sapphire Substrates  

Microsoft Academic Search

The bandwidth of NbN phonon-cooled hot electron bolometer mixers has been systematically investigated with respect to the film thickness and film quality variation. The films, 2.5 to 10 nm thick, were fabricated on sapphire substrates using DC reactive magnetron sputtering. All devices consisted of several parallel strips, each 1 j.t wide and 21.1, long, placed between Ti-Au contact pads. To

S. Cherednichenko; P. Yagoubov; K. Il'In; G. Gol'Tsman; E. Gershenzon

1997-01-01

479

Parafibromin inhibits cancer cell growth and causes G1 phase arrest  

Microsoft Academic Search

The HRPT2 (hereditary hyperparathyroidism type 2) tumor suppressor gene encodes a ubiquitously expressed 531 amino acid protein termed parafibromin. Inactivation of parafibromin predisposes one to the development of HPT-JT syndrome. To date, the role of parafibromin in tumorigenesis is largely unknown. Here, we report that parafibromin is a nuclear protein that possesses anti-proliferative properties. We show that overexpression of parafibromin

Chun Zhang; Dong Kong; Min-Han Tan; Donald L. Pappas; Peng-Fei Wang; Jindong Chen; Leslie Farber; Nian Zhang; Han-Mo Koo; Michael Weinreich; Bart O. Williams; Bin Tean Teh

2006-01-01

480

Familial Isolated Hyperparathyroidism Maps to the Hyperparathyroidism-Jaw Tumor Locus in 1q21-q32 in a Subset of Families  

Microsoft Academic Search

Approximately 70 families with familial isolated hyperparathy- roidism (FIHP) have been reported. Whether it is a separate entity or a variant of multiple endocrine neoplasia type 1 (MEN1 at 11q13) or hyperparathyroidism-jaw tumor (HPT-JT or HRPT2 at 1q21-32) syn- drome is not known. We describe here 3 unreported families with familial primary hyperparathyroidism and evaluate their clinical, pathological, and genetic

BIN TEAN TEH; FILIP FARNEBO; STEPHEN TWIGG; ANDERS HOOG; SOILI KYTOLA; EEVA KORPI-HYOVALTI; FUNG KI WONG; JORGEN NORDENSTROM; LARS GRIMELIUS; KERSTIN SANDELIN; BRUCE ROBINSON; LARS-OVE FARNEBO; CATHARINA LARSSON

2010-01-01

481

The Holomorphic Extension of C k CR Functions on Tube Submanifolds  

E-print Network

.e. the tube over the point x passing through z). For z = x + iy 2 M , let G ffl (z) = 1 ffl n (?) n=2 Z i2Tz f(i)g)e \\Gammaffl \\Gamma2 jt\\Gammayj 2 dt Viewed this way, G ffl is the convolution of fg in the tube­direction The Holomorphic Extension of C k ­ CR Functions on Tube Submanifolds Al Boggess August, 1997

Boggess, Albert

482

Hot isostatically pressed manufacture of high strength MERL 76 disk and seal shapes  

NASA Technical Reports Server (NTRS)

The feasibility of using MERL 76, an advanced high strength direct hot isostatic pressed powder metallurgy superalloy, as a full scale component in a high technology, long life, commercial turbine engine were demonstrated. The component was a JT9D first stage turbine disk. The JT9D disk rim temperature capability was increased by at least 22 C and the weight of JT9D high pressure turbine rotating components was reduced by at least 35 pounds by replacement of forged Superwaspaloy components with hot isostatic pressed (HIP) MERL 76 components. The process control plan and acceptance criteria for manufacture of MERL 76 HIP consolidated components were generated. Disk components were manufactured for spin/burst rig test, experimental engine tests, and design data generation, which established lower design properties including tensile, stress-rupture, 0.2% creep and notched (Kt = 2.5) low cycle fatigue properties, Sonntag, fatigue crack propagation, and low cycle fatigue crack threshold data. Direct HIP MERL 76, when compared to conventionally forged Superwaspaloy, is demonstrated to be superior in mechanical properties, increased rim temperature capability, reduced component weight, and reduced material cost by at least 30% based on 1980 costs.

Eng, R. D.; Evans, D. J.

1982-01-01

483

Development of imaging bolometers for magnetic fusion reactors (invited).  

PubMed

Imaging bolometers utilize an infrared (IR) video camera to measure the change in temperature of a thin foil exposed to the plasma radiation, thereby avoiding the risks of conventional resistive bolometers related to electric cabling and vacuum feedthroughs in a reactor environment. A prototype of the IR imaging video bolometer (IRVB) has been installed and operated on the JT-60U tokamak demonstrating its applicability to a reactor environment and its ability to provide two-dimensional measurements of the radiation emissivity in a poloidal cross section. In this paper we review this development and present the first results of an upgraded version of this IRVB on JT-60U. This upgrade utilizes a state-of-the-art IR camera (FLIR/Indigo Phoenix-InSb) (3-5 microm, 256 x 360 pixels, 345 Hz, 11 mK) mounted in a neutron/gamma/magnetic shield behind a 3.6 m IR periscope consisting of CaF(2) optics and an aluminum mirror. The IRVB foil is 7 cm x 9 cm x 5 microm tantalum. A noise equivalent power density of 300 microW/cm(2) is achieved with 40 x 24 channels and a time response of 10 ms or 23 microW/cm(2) for 16 x 12 channels and a time response of 33 ms, which is 30 times better than the previous version of the IRVB on JT-60U. PMID:19044463

Peterson, Byron J; Parchamy, Homaira; Ashikawa, Naoko; Kawashima, Hisato; Konoshima, Shigeru; Kostryukov, Artem Yu; Miroshnikov, Igor V; Seo, Dongcheol; Omori, T

2008-10-01

484

Electronic and Vibronic Problems of Nanosized Mixed Valence Clusters: Advances and Challenges  

NASA Astrophysics Data System (ADS)

Here we discuss the electronic and vibronic problems of mixed valency (MV) in molecular clusters which are of current interest in areas as diverse as solid-state chemistry, biochemistry, and molecular magnetism. Modern research in these areas is focused on the nanosized clusters at the border between classical and quantum scales and for this reason they are particularly difficult to study. First, we describe a general approach to the evaluation of the energy pattern of MV systems containing arbitrary number of localized spins and itinerant electrons with due account for the double exchange and other relevant interactions, like interelectronic Coulomb repulsion in instantly localized configurations. Then we present a symmetry adapted approach to the dynamic vibronic problem in large scale multimode Jahn-Teller (JT) systems, in particular, molecular MV clusters. The developed techniques are applied to the analysis of nanosized MV systems with emphasis on the 2e-reduced MV Keggin anion in which the electronic pair is delocalized over twelve sites (Td) giving rise to the (1T2+1E+1A1)(e+t2) and (3T1+3T2)(e+t2) combined JT/pseudo JT problems for the spin-singlet and spin-triplet states. The delocalization of the two itinerant electrons in this remarkable systems was shown to lead to an effective spin paring. We study the energy pattern of this MV system and show that the vibronic interaction results in the ferromagnetic contribution.

Clemente-Juan, Juan M.; Gaita-Ario, Alejandro; Borrs-Almenar, Juan J.; Coronado, Eugenio; Palii, Andrew; Tsukerblat, Boris

2013-04-01

485

An experimental study on the two-parameter crack tip field  

NASA Astrophysics Data System (ADS)

J-integral values were determined directly from the measured orthogonal displacement fields surrounding a crack in 2024-0, 2024-T3, 2091-T3 and 5052-H32 aluminum alloy SEN and cruciform specimens of 0.8 mm thickness. These J-values were then used to compute the crack tip displacements associated with the HRR field. The second order displacement component in the two-parameter, J-T and the more general J-Q ductile fracture theories was obtained by subtracting the HRR displacement from the measured crack tip displacement. This second order displacement component in the direction parallel to the crack was an order larger than the corresponding component perpendicular to the crack as predicted by the J-Q theory but not by the J-T theory. The negative slope of the log-log plots of the two orthogonal, second order displacement components with respect to the radial distance, however, suggests a strain singularity higher than that of the HRR strain singularity. The basic postulate of the asymptotic expansion of crack tip pansion stress is violated and thus neither the J-T nor the J-Q theory can be a valid criterion in elastic-plastic fracture mechanics.

Dadkhah, Mahyar S.; Kobayashi, A. S.

1992-05-01

486

Strong coupling of Jahn-Teller distortion to oxygen-octahedron rotation and functional properties in epitaxially strained orthorhombic LaMnO3  

NASA Astrophysics Data System (ADS)

First-principles calculations reveal a large cooperative coupling of Jahn-Teller (JT) distortion to oxygen-octahedron rotations in perovskite LaMnO3. The combination of the two distortions is responsible for stabilizing the strongly orthorhombic A-AFM insulating (I) ePbnm ground state relative to a metallic ferromagnetic (FM-M) phase. However, epitaxial strain due to coherent matching to a crystalline substrate can change the relative stability of the two states. In particular, coherent matching to a square-lattice substrate favors the less orthorhombic FM-M phase, with the A-AFM phase stabilized at higher values of tensile epitaxial strain due to its larger volume per formula unit, resulting in a coupled magnetic and metal-insulator transition at a critical strain close to 1%. At the phase boundary, a very large magnetoresistance is expected. Tensile epitaxial strain enhances the JT distortion and opens the band gap in the A-AFM-I c-ePbnm phase, offering the opportunity for band-gap engineering. Compressive epitaxial strain induces a transition within the FM-M phase from the c-ePbnm orientation to the ab-ePbnm orientation with a change in the direction of the magnetic easy axis relative to the substrate, yielding strain-controlled magnetization at the phase boundary. Similar behavior is expected in other JT active Pbnm perovskites.

Lee, Jun Hee; Delaney, Kris T.; Bousquet, Eric; Spaldin, Nicola A.; Rabe, Karin M.

2013-11-01

487

Development of imaging bolometers for magnetic fusion reactors (invited)a)  

NASA Astrophysics Data System (ADS)

Imaging bolometers utilize an infrared (IR) video camera to measure the change in temperature of a thin foil exposed to the plasma radiation, thereby avoiding the risks of conventional resistive bolometers related to electric cabling and vacuum feedthroughs in a reactor environment. A prototype of the IR imaging video bolometer (IRVB) has been installed and operated on the JT-60U tokamak demonstrating its applicability to a reactor environment and its ability to provide two-dimensional measurements of the radiation emissivity in a poloidal cross section. In this paper we review this development and present the first results of an upgraded version of this IRVB on JT-60U. This upgrade utilizes a state-of-the-art IR camera (FLIR/Indigo Phoenix-InSb) (3-5 ?m, 256360 pixels, 345 Hz, 11 mK) mounted in a neutron/gamma/magnetic shield behind a 3.6 m IR periscope consisting of CaF2 optics and an aluminum mirror. The IRVB foil is 7 cm9 cm5 ?m tantalum. A noise equivalent power density of 300 ?W/cm2 is achieved with 4024 channels and a time response of 10 ms or 23 ?W/cm2 for 1612 channels and a time response of 33 ms, which is 30 times better than the previous version of the IRVB on JT-60U.

Peterson, Byron J.; Parchamy, Homaira; Ashikawa, Naoko; Kawashima, Hisato; Konoshima, Shigeru; Kostryukov, Artem Yu.; Miroshnikov, Igor V.; Seo, Dongcheol; Omori, T.

2008-10-01

488

100 s extraction of negative ion beams by using actively temperature-controlled plasma grid  

NASA Astrophysics Data System (ADS)

Long pulse beam extraction with a current density of 120 A/m2 for 100 s has been achieved with a newly developed plasma grid (PG) for the JT-60SA negative ion source which is designed to produce high power and long pulse beams with a negative ion current of 130 A/m2 (22 A) and a pulse length of 100 s. The PG temperature is regulated by fluorinated fluids in order to keep the high PG temperature for the cesium-seeded negative ion production. The time constant for temperature controllability of the PG was measured to be below 10 s, which was mainly determined by the heat transfer coefficient of the fluorinated fluid. The measured decay time of the negative ion current extracted from the actively temperature-controlled PG was 430 s which was sufficient for the JT-60SA requirement, and much longer than that by inertial-cooling PG of 60 s. Obtained results of the long pulse capability are utilized to design the full size PG for the JT-60SA negative ion source.

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

2014-02-01

489

Fast Super-Resolution Imaging with Ultra-High Labeling Density Achieved by Joint Tagging Super-Resolution Optical Fluctuation Imaging  

PubMed Central

Previous stochastic localization-based super-resolution techniques are largely limited by the labeling density and the fidelity to the morphology of specimen. We report on an optical super-resolution imaging scheme implementing joint tagging using multiple fluorescent blinking dyes associated with super-resolution optical fluctuation imaging (JT-SOFI), achieving ultra-high labeling density super-resolution imaging. To demonstrate the feasibility of JT-SOFI, quantum dots with different emission spectra were jointly labeled to the tubulin in COS7 cells, creating ultra-high density labeling. After analyzing and combining the fluorescence intermittency images emanating from spectrally resolved quantum dots, the microtubule networks are capable of being investigated with high fidelity and remarkably enhanced contrast at sub-diffraction resolution. The spectral separation also significantly decreased the frame number required for SOFI, enabling fast super-resolution microscopy through simultaneous data acquisition. As the joint-tagging scheme can decrease the labeling density in each spectral channel, thereby bring it closer to single-molecule state, we can faithfully reconstruct the continuous microtubule structure with high resolution through collection of only 100 frames per channel. The improved continuity of the microtubule structure is quantitatively validated with image skeletonization, thus demonstrating the advantage of JT-SOFI over other localization-based super-resolution methods. PMID:25665878

Zeng, Zhiping; Chen, Xuanze; Wang, Hening; Huang, Ning; Shan, Chunyan; Zhang, Hao; Teng, Junlin; Xi, Peng

2015-01-01

490

Investigation of neon-nitrogen mixed refrigerant Joule-Thomson cryocooler operating below 70 K with precooling at 100 K  

NASA Astrophysics Data System (ADS)

There has been two-stage mixed refrigerant (MR) Joule-Thomson (JT) refrigeration cycle suggested for cooling high temperature superconductor (HTS) electric power cable below 70 K. As the continuation effort of realizing the actual system, we fabricated and tested a small scale neon and nitrogen MR JT cryocooler to investigate the refrigeration characteristics and performance. The compression system of the refrigeration circuit was accomplished by modifying commercially available air-conditioning rotary compressors. Compressors stably operated at the maximum compression ratio of 31 when the suction pressure was 77 kPa. The achieved lowest temperature was 63.6 K when the heating load was 35.9 W. The measured Carnot efficiency of the present system was 6.5% which was lower than that of the designed goal of 17.4%. The low efficiency of compressor (34.5%), and the pressure drop at the compressor suction were the main reasons for this efficiency degradation. The feasibility and usefulness of neon and nitrogen MR JT refrigeration cycle was validated that the achieved minimum temperature was 63.6 K even though the pressure after the expansion was maintained by 130 kPa. The comparison between the measurement and calculation showed that each stream temperature of refrigeration cycle were predictable within 3% error by Peng-Robinson equation of state (EOS).

Lee, Jisung; Oh, Haejin; Jeong, Sangkwon

2014-05-01

491

Joule-Thomson cryocooler with neon and nitrogen mixture using commercial air-conditioning compressors  

NASA Astrophysics Data System (ADS)

A 2-stage mixed refrigerant (MR) Joule-Thomson (JT) cryocooler was designed for cooling high temperature superconducting cable below 70 K. The low temperature cycle was to operate with neon-nitrogen mixture, and the required compression ratio was approximately 24 when the suction pressure was 100 kPa. The high compression ratio of 24, the low pressure of 100 kPa at compressor suction, and the working fluid with high heat of compression were challenging issues to existing typical compression systems. We developed an innovative compression system with commercial oil-lubricated air-conditioning compressors. They were 2-stage rotary compressors originally designed for R410Aand connected in series. The compressors were modified to accommodate effective intercooling at every stage to alleviate compressor overheating problem. Additionally, fine-grade three-stage oil filters, an adsorber, and driers were installed at the discharge line to avoid a potential clogging problem from oil mist and moisture at low temperature sections. The present compression system was specifically demonstrated with a neon-nitrogen MR JT cryocooler. The operating pressure ratio was able to meet the designed specifications, and the recorded no-load mini mum temperature was 63.5 K . Commercial air-conditioning compressors were successfully applied to the high-c ompression ratio MR JT cryocooler with adequate modification using off-the-shelf components.

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

2014-01-01

492

Improving Control in a Joule-Thomson Refrigerator  

NASA Technical Reports Server (NTRS)

A report discusses a modified design of a Joule-Thomson (JT) refrigerator under development to be incorporated into scientific instrumentation aboard a spacecraft. In most other JT refrigerators (including common household refrigerators), the temperature of the evaporator (the cold stage) is kept within a desired narrow range by turning a compressor on and off as needed. This mode of control is inadequate for the present refrigerator because a JT-refrigerator compressor performs poorly when the flow from its evaporator varies substantially, and this refrigerator is required to maintain adequate cooling power. The proposed design modifications include changes in the arrangement of heat exchangers, addition of a clamp that would afford a controlled heat leak from a warmer to a cooler stage to smooth out temperature fluctuations in the cooler stage, and incorporation of a proportional + integral + derivative (PID) control system that would regulate the heat leak to maintain the temperature of the evaporator within a desired narrow range while keeping the amount of liquid in the evaporator within a very narrow range in order to optimize the performance of the compressor. Novelty lies in combining the temperature- and cooling-power-regulating controls into a single control system.

Borders, James; Pearson, David; Prina, Mauro

2005-01-01

493

A Si/Glass Bulk-Micromachined Cryogenic Heat Exchanger for High Heat Loads: Fabrication, Test, and Application Results  

PubMed Central

This paper reports on a micromachined Si/glass stack recuperative heat exchanger with in situ temperature sensors. Numerous high-conductivity silicon plates with integrated platinum resistance temperature detectors (Pt RTDs) are stacked, alternating with low-conductivity Pyrex spacers. The device has a 1 1-cm2 footprint and a length of up to 3.5 cm. It is intended for use in JouleThomson (JT) coolers and can sustain pressure exceeding 1 MPa. Tests at cold-end inlet temperatures of 237 K252 K show that the heat exchanger effectiveness is 0.9 with 0.039-g/s helium mass flow rate. The integrated Pt RTDs present a linear response of 0.26%0.30%/K over an operational range of 205 K296 K but remain usable at lower temperatures. In self-cooling tests with ethane as the working fluid, a JT system with the heat exchanger drops 76.1 K below the inlet temperature, achieving 218.7 K for a pressure of 835.8 kPa. The system reaches 200 K in transient state; further cooling is limited by impurities that freeze within the flow stream. In JT self-cooling tests with an external heat load, the system reaches 239 K while providing 1 W of cooling. In all cases, there is an additional parasitic heat load estimated at 300500 mW. PMID:20490284

Zhu, Weibin; White, Michael J.; Nellis, Gregory F.; Klein, Sanford A.; Gianchandani, Yogesh B.

2010-01-01

494

Causes of high pressure compressor deterioration in service  

NASA Technical Reports Server (NTRS)

The high mechanical reliability and low deterioration rate of the JT9D high-pressure compressor results in long utilization without exceeding engine operational limits. The increasing cost and decreasing supply of fuel have focused attention on the fuel burned implications of such high time use without refurbishment. The paper presents the results of JT9D high pressure compressor studies. The mechanical deterioration of the JT9D high-pressure compressor gaspath parts versus increasing service usage, documented from inspection of service parts, is presented and discussed including changes in airfoil roughness, blade length, airfoil contour and outer air seal trench characteristics. An estimate of the performance loss versus usage is related to each type of damage. The combined estimated high-pressure compressor performance loss for all mechanisms determined from part inspection is compared to historical engine test data to establish the validity of the predicted loss levels. The effect of cold section refurbishment on engine fuel consumption recovery and the results of an optimization study to determine the appropriate interval for high pressure compressor refurbishment are also reported.

Richardson, J. H.; Sallee, G. P.; Smakula, F. K.

1979-01-01

495

100 s extraction of negative ion beams by using actively temperature-controlled plasma grid  

SciTech Connect

Long pulse beam extraction with a current density of 120 A/m{sup 2} for 100 s has been achieved with a newly developed plasma grid (PG) for the JT-60SA negative ion source which is designed to produce high power and long pulse beams with a negative ion current of 130 A/m{sup 2} (22 A) and a pulse length of 100 s. The PG temperature is regulated by fluorinated fluids in order to keep the high PG temperature for the cesium-seeded negative ion production. The time constant for temperature controllability of the PG was measured to be below 10 s, which was mainly determined by the heat transfer coefficient of the fluorinated fluid. The measured decay time of the negative ion current extracted from the actively temperature-controlled PG was 430 s which was sufficient for the JT-60SA requirement, and much longer than that by inertial-cooling PG of 60 s. Obtained results of the long pulse capability are utilized to design the full size PG for the JT-60SA negative ion source.

Kojima, A., E-mail: kojima.atsushi@jaea.go.jp; Hanada, M.; Yoshida, M.; Tobari, H.; Kashiwagi, M.; Umeda, N.; Watanabe, K. [Japan Atomic Energy Agency, Naka, Ibaraki 311-0193 (Japan)] [Japan Atomic Energy Agency, Naka, Ibaraki 311-0193 (Japan); Grisham, L. R. [Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)] [Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)

2014-02-15

496

Electronic conduction through quantum dots undergoing Jahn-Teller transition  

NASA Astrophysics Data System (ADS)

Electronic conduction through quantum dots undergoing Jahn-Teller distortion is studied utilizing a model presented recently in connection with investigation of possible magnetovoltaic effect in this system. The quantum dot connected to two metallic leads is described by the single impurity Anderson model (SIAM) Hamiltonian along with two additional terms describing the Jahn-Teller distortion and an applied magnetic field. The self-consistent calculation shows that the Jahn-Teller (J-T) order parameter which is a measure of the splitting of the degenerate dot level is maximum at zero temperature and smoothly goes to zero at the structural transition temperature, Ts. The conductance is greatly suppressed by the J-T distortion at low temperatures, slowly increases and attains a maximum at Ts, above which it shows a slow decrease. When plotted as a function of the energy of the dot level, the conductance shows two peaks corresponding to the two split J-T levels at temperatures below Ts, which further develops into a four peak structure in the presence of a magnetic field.

Bose, Shyamalendu M.; Ndengeyintwali, Didier; Behera, Surjyo N.; Nayak, Sanjeev K.; Entel, Peter

2014-02-01

497

Development of imaging bolometers for magnetic fusion reactors (invited)  

SciTech Connect

Imaging bolometers utilize an infrared (IR) video camera to measure the change in temperature of a thin foil exposed to the plasma radiation, thereby avoiding the risks of conventional resistive bolometers related to electric cabling and vacuum feedthroughs in a reactor environment. A prototype of the IR imaging video bolometer (IRVB) has been installed and operated on the JT-60U tokamak demonstrating its applicability to a reactor environment and its ability to provide two-dimensional measurements of the radiation emissivity in a poloidal cross section. In this paper we review this development and present the first results of an upgraded version of this IRVB on JT-60U. This upgrade utilizes a state-of-the-art IR camera (FLIR/Indigo Phoenix-InSb) (3-5 {mu}m, 256x360 pixels, 345 Hz, 11 mK) mounted in a neutron/gamma/magnetic shield behind a 3.6 m IR periscope consisting of CaF{sub 2} optics and an aluminum mirror. The IRVB foil is 7 cmx9 cmx5 {mu}m tantalum. A noise equivalent power density of 300 {mu}W/cm{sup 2} is achieved with 40x24 channels and a time response of 10 ms or 23 {mu}W/cm{sup 2} for 16x12 channels and a time response of 33 ms, which is 30 times better than the previous version of the IRVB on JT-60U.

Peterson, Byron J.; Parchamy, Homaira; Ashikawa, Naoko [National Institute for Fusion Science, Toki 509-5292 (Japan); Kawashima, Hisato; Konoshima, Shigeru [Japan Atomic Energy Agency, Naka 311-0193 (Japan); Kostryukov, Artem Yu.; Miroshnikov, Igor V. [St. Petersburg State Technical University, St. Petersburg 195251 (Russian Federation); Seo, Dongcheol [National Fusion Research Institute, Daejeon 305-333 (Korea, Republic of); Omori, T. [Graduate University for Advanced Studies, Toki 509-5292 (Japan)

2008-10-15

498

4.5 K Cooling System for a Cryogenically Cooled Probe for a 920 MHz NMR  

NASA Astrophysics Data System (ADS)

The feasibility of closed-cycle 4.5 K cooling has been demonstrated for a cryogenically cooled probe for the world highest magnetic-field 920 MHz Nuclear Magnetic Resonance (NMR) operated at the National Institute for Materials Science (NIMS), by means of the following model experiments. The cooling system with a cooling capacity of 4.55 W comprises a Gifford-McMahon (GM) cryocooler and two-stage expansion Joule-Thomson (J-T) circuit. Supercritical helium is produced by the 1st J-T valve, which is then liquefied by the 2nd J-T valve. Helium mist cools a cooling stage for the radio frequency (RF) coils. The NMR sensitivity improvement in terms of the signal-to-noise (S/N) ratio of the 4.5 K probe is expected to be double of the conventionally used 20 K cryogenic probe, due to the reduction of the thermal noise of the RF coils.

Yokota, H.; Okamura, T.; Ohtani, Y.; Kuriyama, T.; Takahashi, M.; Horiuchi, T.; Kikuchi, J.; Yokoyama, S.; Maeda, H.

2004-06-01

499

Investigation of pressure drop in capillary tube for mixed refrigerant Joule-Thomson cryocooler  

SciTech Connect

A capillary tube is commonly used in small capacity refrigeration and air-conditioning systems. It is also a preferred expansion device in mixed refrigerant Joule-Thomson (MR J-T) cryocoolers, since it is inexpensive and simple in configuration. However, the flow inside a capillary tube is complex, since flashing process that occurs in case of refrigeration and air-conditioning systems is metastable. A mixture of refrigerants such as nitrogen, methane, ethane, propane and iso-butane expands below its inversion temperature in the capillary tube of MR J-T cryocooler and reaches cryogenic temperature. The mass flow rate of refrigerant mixture circulating through capillary tube depends on the pressure difference across it. There are many empirical correlations which predict pressure drop across the capillary tube. However, they have not been tested for refrigerant mixtures and for operating conditions of the cryocooler. The present paper assesses the existing empirical correlations for predicting overall pressure drop across the capillary tube for the MR J-T cryocooler. The empirical correlations refer to homogeneous as well as separated flow models. Experiments are carried out to measure the overall pressure drop across the capillary tube for the cooler. Three different compositions of refrigerant mixture are used to study the pressure drop variations. The predicted overall pressure drop across the capillary tube is compared with the experimentally obtained value. The predictions obtained using homogeneous model show better match with the experimental results compared to separated flow models.

Ardhapurkar, P. M. [Mechanical Engineering Department, Indian Institute of Technology Bombay, Mumbai, MS 400 076 India and S. S. G. M. College of Engineering Shegaon, MS 444 203 (India); Sridharan, Arunkumar; Atrey, M. D. [Mechanical Engineering Department, Indian Institute of Technology Bombay, Mumbai, MS 400 076 (India)

2014-01-29

500

Supercomputing Sheds Light on the Dark Universe  

SciTech Connect

At Argonne National Laboratory, scientists are using supercomputers to shed light on one of the great mysteries in science today, the Dark Universe. With Mira, a petascale supercomputer at the Argonne Leadership Computing Facility, a team led by physicists Salman Habib and Katrin Heitmann will run the largest, most complex simulation of the universe ever attempted. By contrasting the results from Mira with state-of-the-art telescope surveys, the scientists hope to gain new insights into the distribution of matter in the universe, advancing future investigations of dark energy and dark matter into a new realm. The team's research was named a finalist for the 2012 Gordon Bell Prize, an award recognizing outstanding achievement in high-performance computing.

Salman Habib

2012-11-15