Note: This page contains sample records for the topic katrin jgar jt from Science.gov.
While these samples are representative of the content of Science.gov,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of Science.gov
to obtain the most current and comprehensive results.
Last update: November 12, 2013.
1

The Katrin Experiment  

NASA Astrophysics Data System (ADS)

Since the confirmation of neutrino oscillations it is known that neutrinos possess a non-zero rest mass. This has far reaching implications for the standard model of particle physics and for cosmology. The KArlsruhe TRitium Neutrino mass experiment, KATRIN, aims to search for the mass of the electron neutrino with a sensitivity of 0.2 eV (90% C.L.) and a detection limit of 0.35 eV (5 sigma). Even a null-result of KATRIN will exclude many theoretical models with degenerate neutrino masses and will give new input for particle astrophysics and cosmology. At KATRIN the same measurement principle is utilized as in the previous neutrino mass experiments in Mainz and Troitsk. These experiments search for a deviation in the spectrum of the electrons in the beta-decay of tritium near the endpoint, that will be caused by a non-zero neutrino mass. The beta-spectrum is measured using a MAC-E filter. KATRIN is being set up at the Forschungszentrum Karlsruhe in Germany. The principle and present status of KATRIN are presented.

Beck, M.

2007-11-01

2

The KATRIN experiment  

NASA Astrophysics Data System (ADS)

The KArlsruhe TRitium Neutrino mass experiment, KATRIN, aims to search for the mass of the electron neutrino with a sensitivity of 0.2eV/c2 (90% C.L.) and a detection limit of 0.35 eV/c2 (5?). Both a positive or a negative result will have far reaching implications for cosmology and the standard model of particle physics and will give new input for astroparticle physics and cosmology. The major components of KATRIN are being set up at the Karlsruhe Institut of Technology in Karlsruhe, Germany, and test measurements of the individual components have started. Data taking with tritium is scheduled to start in 2012.

Beck, Marcus; Katrin Collaboration

2010-01-01

3

Sensitivity and Systematics of KATRIN Experiment  

SciTech Connect

The KArlsruhe TRItium Neutrino experiment (KATRIN) will measure a 'kinematical' electron antineutrino mass upper limit up to 0.2 eV/c{sup 2}. The experimental setup based on an electrostatic spectrometer with adiabatic magnetic collimation and windowless gaseous tritium source is briefly described. This sensitivity to the neutrino mass could be reached with a 10-m-diameter spectrometer after three years of data taking. Several major sources of the systematic errors are discussed.

Titov, N.A. [Institute for Nuclear Research, Russian Academy of Sciences, pr. Shestidesyatiletiya Oktyabrya 7a, Moscow, 117312 (Russian Federation)] [and others

2004-11-01

4

EM field, tracking and scattering simulations for the KATRIN experiment  

NASA Astrophysics Data System (ADS)

The aim of the KATRIN experiment is to determine the absolute neutrino mass scale in a model independent way, by measuring the electron energy spectrum shape near the endpoint of tritium beta decay. For this purpose, the KATRIN experiment uses two spectrometers with high voltage, and many superconducting and air coils, to create the necessary electric and magnetic fields. In order to design the spectrometer electrodes and the coils, and to investigate and understand the various background processes and systematic effects, one needs various accurate electric and magnetic field, charged particle tracking and scattering computations, for which we use mainly our self-written C and C++ codes.

Glück, Ferenc; KATRIN Collaboration

2013-02-01

5

The Cryogenic Pumping Section of the KATRIN Experiment  

Microsoft Academic Search

In order to determine the absolute scale of the neutrino mass with a sensitivity of 0.2 (90% Confidence Level), the Karlsruhe Tritium Neutrino experiment (KATRIN) operates a series of superconducting magnet systems, which guide the electrons adiabatically from the source of tritium beta-decay to the detector within a magnetic flux of 191 . The 7 m long Cryogenic Pumping Section

Woosik Gil; Jochen Bonn; Beate Bornschein; Rainer Gehring; Oleg Kazachenko; Jonny Kleinfeller; Sergiy Putselyk

2010-01-01

6

A review of the characterization KATRIN detector section  

NASA Astrophysics Data System (ADS)

A short review of the Karlsruhe Tritium Neutrino (KATRIN) experiment's detector section and preliminary data from the characterization of the focal plane detector will be presented. KATRIN's goal is to attain a mass sensitivity of .2 eV by measuring the shape of the tritium beta decay spectrum at the end point. There are essentially three main sections to the KATRIN's detector: a tritium source, spectrometers, and a detector section. The beta decay electrons are emitted from a gaseous tritium source and magnetically guided to a pre-spectrometer then to the main spectrometer. The pre-spectrometer removes the electrons 100 eV below the endpoint energy. The main spectrometer, with an energy resolution of .93 eV, allows us to achieve the .2 eV sensitivity. Finally a silicon PIN diode array detects the analyzed electrons. The array is 94 millimeters in diameter, 500 microns thick and segmented into 144 sections of equal area. I will discuss the performance front-end electronics and of the characterization of the array with a precision electron gun.

Wall, Brandon

2008-10-01

7

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

8

Progress of the JT-60SA project  

NASA Astrophysics Data System (ADS)

The JT-60SA project implemented by Japan and Europe is progressing on schedule towards the first plasma in March 2019. After careful R&D, procurements of the major components have entered their manufacturing stages. In parallel, disassembly of JT-60U has been completed on time, and the JT-60SA tokamak assembly is expected to start in January 2013. The JT-60SA device, a highly shaped large superconducting tokamak with a variety of plasma control actuators, has been designed in order to contribute to ITER and to complement ITER in all the major areas of fusion plasma development necessary to decide DEMO reactor construction. Detailed assessments and prediction studies of the JT-60SA plasma regimes have confirmed these capabilities: using ITER- and DEMO-relevant plasma regimes, heating conditions, and its sufficiently long discharge duration, JT-60SA enables studies on magnetohydrodynamic stability at high beta, heat/particle/momentum transport, high-energy ion physics, pedestal physics including edge localized mode control, and divertor physics. By integrating these studies, the project provides ‘simultaneous and steady-state sustainment of the key performance characteristics required for DEMO’ with integrated control scenario development.

Kamada, Y.; Barabaschi, P.; Ishida, S.; the JT-60SA Team; Research Plan Contributors, JT-60SA

2013-10-01

9

Forecasting neutrino masses from combining KATRIN and the CMB observations: Frequentist and Bayesian analyses  

SciTech Connect

We present a showcase for deriving bounds on the neutrino masses from laboratory experiments and cosmological observations. We compare the frequentist and Bayesian bounds on the effective electron neutrino mass m{sub {beta}} which the KATRIN neutrino mass experiment is expected to obtain, using both an analytical likelihood function and Monte Carlo simulations of KATRIN. Assuming a uniform prior in m{sub {beta}}, we find that a null result yields an upper bound of about 0.17 eV at 90% confidence in the Bayesian analysis, to be compared with the frequentist KATRIN reference value of 0.20 eV. This is a significant difference when judged relative to the systematic and statistical uncertainties of the experiment. On the other hand, an input m{sub {beta}}=0.35 eV, which is the KATRIN 5{sigma} detection threshold, would be detected at virtually the same level. Finally, we combine the simulated KATRIN results with cosmological data in the form of present (post-WMAP) and future (simulated Planck) observations. If an input of m{sub {beta}}=0.2 eV is assumed in our simulations, KATRIN alone excludes a zero neutrino mass at 2.2{sigma}. Adding Planck data increases the probability of detection to a median 2.7{sigma}. The analysis highlights the importance of combining cosmological and laboratory data on an equal footing.

Host, Ole; Lahav, Ofer; Abdalla, Filipe B.; Eitel, Klaus [Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen (Denmark); Department of Physics and Astronomy, University College London, Gower St., London WC1E 6BT (United Kingdom); Forschungszentrum Karlsruhe, Institut fuer Kernphysik, Postfach 3640, 76021 Karlsruhe (Germany)

2007-12-01

10

Development of the JT-60SA Neutral Beam Injectors  

SciTech Connect

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

Hanada, M.; Kojima, A.; Inoue, T.; Watanabe, K.; Taniguchi, M.; Kashiwagi, M.; Tobari, H.; Umeda, N.; Akino, N.; Kazawa, M.; Oasa, K.; Komata, M.; Usui, K.; Mogaki, K.; Sasaki, S.; Kikuchi, K.; Nemoto, S.; Ohshima, K.; Endo, Y.; Simizu, T. [Japan Atomic Energy Agency, 801-1 Mukoyama, Naka311-0193 (Japan)

2011-09-26

11

ECR Discharge Cleaning on JT-60U.  

National Technical Information Service (NTIS)

Electron Cyclotron Resonance Discharge Cleaning (ECR-DC) was studied on JT-60U whose first wall was composed of graphite tiles. The radio frequency of 2GHz band, which was the original Lower Hybrid Range of Frequency (LHRF) heating system, was applied to ...

Y. Ikeda K. Ushigusa M. Seki K. Suganuma N. Toyoshima

1997-01-01

12

Overview of the JT-60SA project  

Microsoft Academic Search

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.

S. Ishida; P. Barabaschi; Y. Kamada

2011-01-01

13

Design of JT-60SA Magnets and Associated Experimental Validations  

Microsoft Academic Search

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

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

2011-01-01

14

Jt8d-100 Turbofan Engine, Phase 1.  

National Technical Information Service (NTIS)

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 i...

1974-01-01

15

An Overview of the Data Acquisition System in the KATRIN Experiment  

NASA Astrophysics Data System (ADS)

The Karlsruhe Tritium Neutrino (KATRIN) Experiment is a next generation tritium ?-decay experiment designed to make a model-independent measurement of the ?e-mass with an estimated sensitivity of 0.2 eV/c^2. This would represent an order of magnitude improvement in the ?e-mass sensitivity compared to previous tritium beta-decay experiments. The basic function of the Data Acquisition System (DAQ) is to process and store signals from all detector modules within the KATRIN experimental setup. In order to reach the specified ?e-mass sensitivity, the KATRIN DAQ must be able to process event rates over a range spanning a few mHz for ?e-mass measurements to MHz for calibration measurements. A multi-user graphical Object-oriented Real-time Control and Acquisition (ORCA) interface serves as the software that is employed to readout the DAQ electronics. In this talk, the KATRIN DAQ electronics as well as the ORCA software interface will be discussed. )

Phillips, David, II

2010-02-01

16

Design study of the JT-60SU device. No. 4. The vacuum vessel and cryostat of JT-60SU.  

National Technical Information Service (NTIS)

The vacuum vessel and the cryostat for the JT-60 Super Upgrade (JT-60SU) have been designed. Two types of the complex materials for the vacuum vessel were chosen on the basis of the avoidance of tritium occlusion and the low irradiation, i.e. (1) SUS316 c...

K. Tobita K. Ushigusa Y. Neyatani

1997-01-01

17

KATRIN - direct measurement of a sub-eV neutrino mass  

NASA Astrophysics Data System (ADS)

The KArlsruhe TRItium Neutrino (KATRIN) experiment is a next-generation direct neutrino mass experiment designed to investigate in a model-independent way the fundamental mass scale of neutrinos with sub-eV sensitivity. It combines an ultra-luminous molecular windowless gaseous tritium source with a high resolution electrostatic retarding spectrometer (MAC-E filter system) to measure the spectral shape of ?-decay electrons close to the T2 end point at 18.6 keV with unprecedented precision. If no neutrino mass signal is found, the KATRIN sensitivity after 3 years of measurements is m?<0.2 eV (90%CL.); a ?-mass signal of m?=0.35(0.30) eV can be measured with 5 (3) ? evidence. The experiment is scheduled to start first tritium runs in late 2008.

KATRIN Collaboration

2005-08-01

18

Reduction in cryptosporidiosis associated with introduction of enhanced filtration of drinking water at Loch Katrine, Scotland.  

PubMed

SUMMARY Previous evidence has suggested an association between cryptosporidiosis and consumption of unfiltered drinking water from Loch Katrine in Scotland. Before September 2007, the water was only micro-strained and chlorinated; however, since that time, coagulation and rapid gravity filtration have been installed. In order to determine risk factors associated with cryptosporidiosis, including drinking water, we analysed data on microbiologically confirmed cases of cryptosporidiosis from 2004 to 2010. We identified an association between the incidence of cryptosporidiosis and unfiltered Loch Katrine drinking water supplied to the home (odds ratio 1·86, 95% confidence interval 1·11-3·11, P = 0·019). However, while filtration appears to be associated with initially reduced rates of cryptosporidiosis, evidence suggests it may paradoxically make those consumers more susceptible to other transmission routes in the long-term. These findings support implementation of similar treatment for other unfiltered drinking-water supplies, as a means of reducing cryptosporidiosis associated with drinking water. PMID:23591075

Pollock, K G J; Young, D; Robertson, C; Ahmed, S; Ramsay, C N

2013-04-16

19

Status and prospect of the JT-60SA project  

Microsoft Academic Search

The mission of the JT-60SA project is to contribute to the early realization of fusion energy by supporting the exploitation of ITER and research towards DEMO by addressing key physics issues associated with these machines. The JT-60SA will be capable of confining break-even equivalent class high-temperature deuterium plasmas at a plasma current Ip of 5.5MA and a major radius of

S. Ishida; P. Barabaschi; Y. Kamada

2010-01-01

20

Dimensionless Identity Experiments in JT-60U and JET  

Microsoft Academic Search

This paper summarises results of dimensionless identity experiments in JT-60U and JET, aimed at the comparison of the H-mode pedestal and ELM behaviour in the two devices. Given their similar size, dimensionless matched plasmas are also similar in their dimensional parameters (in particular a is the same in JET and JT-60U). Power and density scans were carried out at two

G Saibene; N Oyama; Y Andrew; JG Cordey; C Giroud; K Guenther; T Hatae; GTA Huysmans; Y Kamada; MAH Kempenaars; A Loarte; J Lönnroth; D McDonald; A Meiggs; MFF Nave; V Parail; R Sartori; S Sharapov; J Stober; T Suzuki; M Takechi; K Toi; H Urano

21

The JT-60SA Cryoplant Current Design Status  

Microsoft Academic Search

In the framework of the ITER Broader Approach, CEA is carrying out the procurement of the Cryogenic System to the JA-EU Satellite Tokamak JT-60SA, which should be operated in Japan at JAEA, Naka in 2014. According to the Conceptual Design Report, JT-60SA is to operate for periods of at least 6 months per year, with major shutdown periods in between

D. Henry; F. Michel; P. Roussel; P. Reynaud; J. Y. Journeaux; J. L. Maréchal; D. Balaguer; C. Roux; M. Matsukawa; K. Yoshida

2008-01-01

22

Advanced tokamak research with integrated modeling in JT-60 Upgrade  

Microsoft Academic Search

Researches on advanced tokamak (AT) have progressed with integrated modeling in JT-60 Upgrade [N. Oyama et al., Nucl. Fusion 49, 104007 (2009)]. Based on JT-60U experimental analyses and first principle simulations, new models were developed and integrated into core, rotation, edge\\/pedestal, and scrape-off-layer (SOL)\\/divertor codes. The integrated models clarified complex and autonomous features in AT. An integrated core model was

N. Hayashi

2010-01-01

23

The front end readout of the focal plane detector (FPD) of KATRIN  

Microsoft Academic Search

The design considerations, manufacturing and first tests of the front end readout for the KATRIN Focal plane detector are presented. The main focus is put to the charge-sensitive preamplifiers, which are built as modules with 6 or 7 channels. The prototype results of the charge-sensitive preamplifier-modules gained by charge injection with a test pulser show rise-times of 70 ns, a

Lars Petzold; J. Amsbaugh; T. Buritt; J. Formaggio; H. Gemmeke; M. Leber; H. Robertson; M. Steidl; T. van Wechel; J. Wilkerson; S. Wustling

2008-01-01

24

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

SciTech Connect

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

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

2006-11-12

25

JT-60 Upgrade vertical stability experiments and analysis  

NASA Astrophysics Data System (ADS)

The JT-60 Upgrade tokamak (JT-60U), can produce plasmas with vertical elongation (kappa approximately = 1.6), and thus allows investigation of vertical instability phenomena. The present work describes investigation of the vertical stability characteristics of JT-60U plasmas through experimental results and simulation. Experiments described include feedback turnoff cases and high beta(sub p) unstable plasma cases. For purposes of simulation, the plasma is modeled as a rigid assembly of current-carrying axisymmetric loops. A nominal conductor model based on design geometry was modified to reproduce the results of a series of coil excitation experiments using a reduced order system identification approach. A two-coil model was used to fit the experimental coil excitation behavior, and the full order conductor model was modified to allow the dominant modes to reflect the low order dynamic response. The resulting plasma-conductor model is shown to reproduce the vertical stability behavior of JT-60U fairly well. Theoretical predictions of limits on the value of Shafranov (Lambda) achievable in JT-60U are made.

Humphreys, D. A.; Yoshino, Ryuji

1992-05-01

26

The JT-60SA Cryoplant Current Design Status  

NASA Astrophysics Data System (ADS)

In the framework of the ITER Broader Approach, CEA is carrying out the procurement of the Cryogenic System to the JA-EU Satellite Tokamak JT-60SA, which should be operated in Japan at JAEA, Naka in 2014. According to the Conceptual Design Report, JT-60SA is to operate for periods of at least 6 months per year, with major shutdown periods in between for maintenance and further installation upgrades. For this operation scenario, the cryoplant and the cryodistribution have to cope with different heat loads which depend on the different JT-60SA operating states. The cryoplant consists of one 4.5 K refrigerator and one 80 K helium loop, each pre-cooled by LN2. These cryogenic subsystems have to operate simultaneously in order to remove the heat loads from the superconducting magnets, 80 K shields and the divertor cryopumps. The first part of this study is based on the Process Flow Diagram (PFD) and presents the current design status of the JT-60SA cryogenic system. The second part is dedicated to the analysis of the cryoplant normal operation modes including the regeneration mode of the divertor cryopumps. Thanks to this analysis, the architecture of the present PFD is proposed in order to match the technical specifications of the cryoplant with the JT-60SA operation requirements.

Henry, D.; Michel, F.; Roussel, P.; Reynaud, P.; Journeaux, J. Y.; Maréchal, J. L.; Balaguer, D.; Roux, C.; Matsukawa, M.; Yoshida, K.

2008-03-01

27

Absolute calibration of microfission chamber in JT-60U  

Microsoft Academic Search

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

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

2008-01-01

28

Development of the Methan Glow Discharge System on JT-60.  

National Technical Information Service (NTIS)

Methan glow discharge system on JT-60 was developed to coat carbon on the surface of the first wall. The objective of this system is to produce the carbon coating on the surface of the first wall and to make the glow discharge for the treatment of the fir...

K. Kawasaki H. Hiratsuka Y. Miyo T. Kuroda K. Ohta

1987-01-01

29

Cryogenic requirements for the JT-60SA Tokamak  

NASA Astrophysics Data System (ADS)

The superconducting tokamak JT-60SA is part of the Broader Approach Programmeagreed between Japan and Europe. CEA is in charge of the cryogenic system procurementincluding the Warm Compression Station, the gas storages, the Refrigerator Cold Box andthe Auxiliary Cold Box (ACB) which has to be installed on the JAEA Naka site in 2016.This paper summarizes the updated cryogenic requirements for the tokamak JT-60SAcryogenic system. The cryogenic system has a refrigeration capacity of about 9 kW equivalent at 4.5K, to supply cryopump panels at 3.7 K, superconducting magnets and cold structures at 4.4 K, HTS current leads at 50 K, and thermal shields at 80 K. This paper presents the static and variable heat loads of the different cooling loops and the results of the rmohydraulic calculations to derive the transient heat loads at the interface between the magnet system cooling loops and the Auxiliary Cold Box.

Michel, Frederic; Hitz, D.; Hoa, Christine; Lamaison, Valerie; Kamiya, Koji; Roussel, Pascal; Wanner, Manfred; Yoshida, Kiyoshi

2012-06-01

30

Recent Progress in JT-60U Experiments with W-shaped Divertor Configuration  

Microsoft Academic Search

The latest results of fusion plasma research in JT-60U after the last APS meeting are presented. After JT-60U achieved the equivalent DT fusion amplification factor of 1.05 last year, the new divertor system was installed in JT-60U and the new series of experiments in FY97 has started from June. So far, the formation and the controllability of the new divertor

Hiroshi Shirai

1997-01-01

31

Recent R&D Activities of Negative-Ion-Based Ion Source for JT-60SA  

Microsoft Academic Search

The JT-60 Super Advanced (JT-60SA) tokamak aims to perform the ITER support and to demonstrate steady-state high-beta plasma project with the collaboration between Japan and EU. To attain these objectives, the negative-ion-based NBI (N-NBI) system is required to inject 10 MW for 100 s at the beam energy of 500 keV. On JT-60U, the present N-NBI ion source has injected

Yoshitaka Ikeda; Masaya Hanada; Masaki Kamada; Kaoru Kobayashi; Naotaka Umeda; Noboru Akino; Noboru Ebisawa; Takashi Inoue; Atsushi Honda; Mikito Kawai; Minoru Kazawa; Katsumi Kikuchi; Masao Komata; Kazuhiko Mogaki; Katsuya Noto; Kuzumi Oasa; Katsumi Oshima; Shunichi Sasaki; Tatsuya Simizu; Tadashi Takenouchi; Yutaka Tanai; Katsutomi Usui; Kazuhiro Watanabe; Larry R. Grisham; Shinichi Kobayashi; Yasushi Yamano; Masahiro Takahashi

2008-01-01

32

Particle simulation of bursting Alfven modes in JT-60U  

SciTech Connect

The results of particle-in-cell simulations of a negative neutral beam heated Alfven-mode experiment in the Japan Atomic Energy Research Institute Tokamak-60 Upgrade (JT-60U) [H. Ninomiya et al., Fusion Sci. Technol. 42, 7 (2002); A. Kitsunezaki et al., ibid. 42, 179 (2002)] are presented. They seem to match quite well the dynamics of the abrupt large-amplitude event (ALE) experimentally observed in the reference JT-60U discharge. The time scale and frequency spread of the ALE are well reproduced too. The issue of the weaker Alfven fluctuation phase following the ALEs, characterized by fast frequency sweeping modes, is also investigated and an interpretation of the full JT-60U bursting-mode phenomenology is presented. Finally, the simulation tool is exploited by ad hoc synthetic diagnostics on the fast ion distribution function to get a deeper insight into the ALE nonlinear dynamics. The underlying fast-growing energetic particle mode saturates as resonant energetic ions are scattered out of the resonance region and displaced outwards. The radially displaced ions resonate with outer Alfven modes and enhance their local drive, consistently with the ''avalanche'' paradigm for mode nonlinear dynamics and energetic ion transports.

Briguglio, S.; Fogaccia, G.; Vlad, G.; Zonca, F.; Shinohara, K.; Ishikawa, M.; Takechi, M. [Associazione EURATOM-ENEA, CR ENEA-Frascati, Via E. Fermi 45, 00044 Frascati (Rome) (Italy); Japan Atomic Energy Agency, Naka, Ibaraki 311-0193 (Japan)

2007-05-15

33

Stability analyses of the beam tube cooling system in the KATRIN source cryostat  

NASA Astrophysics Data System (ADS)

The Karlsruhe Tritium Neutrino Experiment (KATRIN) will measure the mass of the electron antineutrino with a sensitivity of 0.2eV/c, based on the precise measurement of the T? spectrum in a region close to the endpoint. This requires a T source, which can provide 1011? decay electrons per second. The KATRIN source cryostat consists in its centre of a 10 m long beam tube of 90 mm inner diameter, operated at 30 K. Molecular T is injected in the beam tube through a central injection chamber and pumped at either tube end. The T density profile must have a stability of 10-3 in order to limit the systematic errors, yielding stringent requirements on the beam tube temperature homogeneity and stability of ±30mK. This shall be achieved with a design, where the thermal radiation from the vacuum pumps is almost entirely absorbed by LN and He heat exchangers on the pump ports. The beam tube itself is cooled with two-phase tubes that are part of a Ne thermosiphon. After describing the thermal environment of the beam tube, the design parameters and the operational limits of the thermosiphon will be discussed. This is followed by a detailed analysis of its dynamic behaviour, based on experimental data taken in the primary He cooling system. A "tailor-made" Ne condenser design is presented, enabling the suppression of the primary He temperature variations by two orders of magnitude, from c. ±0.3K to below ±3mK.

Grohmann, S.

2009-08-01

34

The KATRIN experiment - a direct measurement of the electron antineutrino mass in the sub-eV region  

NASA Astrophysics Data System (ADS)

With the evidence for massive neutrinos from recent ?-oscillation experiments, one of the most fundamental tasks of particle physics over the next years will be the determination of the absolute mass scale of neutrinos, which has crucial implications for cosmology, astrophysics and particle physics. The KArlsruhe TRItium Neutrino (KATRIN) experiment is the next-generation direct neutrino mass experiment with a sensitivity to sub-eV ?-masses. It combines an ultra-luminous windowless gaseous molecular tritium source with a high resolution electrostatic retarding spectrometer (MAC-E filter) to measure the spectral shape of ?-decay electrons close to the endpoint at 18.6 keV with unprecedented precision. If no neutrino mass signal is found, the KATRIN sensitivity after 3 years of measurements is m?<0.2eV/c2 (90 % C.L.); a ?-mass signal of m?=0.35eV/c2 can be measured with 5 ? evidence.

KATRIN Collaboration

2005-04-01

35

Studies of MHD behaviour in JT-60U  

NASA Astrophysics Data System (ADS)

Several important topics relating to MHD behaviour in JT-60U are presented. An extremely hollow current profile was found for the first time in JT-60U with a very small plasma current in the central region, which is called the current hole. Analyses of equilibrium and stability of the current hole discharge show that, as betap increases, the Pfirsh-Schlüter current increases, which reduces the poloidal field on the inboard side. It may cause the null point of the magnetic field. beta limits due to ideal MHD instability in the current hole do not change very much compared to that of the weakly reversed shear plasma. In high beta long pulse plasmas, it is important to suppress the resistive MHD instability, neo-classical tearing mode (NTM), induced by the lack of bootstrap current inside the magnetic island. Analyses of two typical JT-60U discharges with and without NTM show that the polarization current due to the plasma rotation is a plausible candidate to suppress the NTM though it is very sensitive to the value of mode rotation. To establish an advanced control of NTM, a real-time control system, which can identify the island by ECE measurement and control EC ray to the island by a steerable mirror, was prepared in JT-60U, and it successfully stabilized the NTM. Instability due to fast ions is an important subject for sustaining the fusion reaction. In JT-60U, slow frequency sweeping (slow-FS) modes and bursting MHD modes in the frequency range of the toroidicity-induced Alfvén eigenmodes (TAEs) are observed by injections of negatively-charged ion based neutral beam of ~360 keV. Analyses by the HINST code show that the resonant TAE mode is a candidate of the slow-FS mode. A bursting mode was observed to change its frequency by 10-20 kHz in 1-5 ms (fast FS mode) and evolve explosively in ~400 mus (abrupt large amplitude event). Analyses of the bursting mode show that the non-linear deformation of the energetic ion distribution may cause the repetition of bursting phenomena and the recovery of lost energetic ions.

Ozeki, T.; JT-60 Team

2003-05-01

36

Improvement of JT-60U Negative Ion Source Performance  

SciTech Connect

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

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

2000-11-15

37

Shine through measurements with hydrogen beam in JT-60  

NASA Astrophysics Data System (ADS)

The shine through rate with hydrogen beams in the JT-60 neutral beam injection experiments was measured in a beam energy range of 40-75 keV and plasma densities of 1-7 x 10(exp 19) m(exp -3) for the estimation of absorbed beam power in the plasma. The shine through rate was calculated from the temperature rise measurement with thermocouples installed in an armor plate. The shine through depends on the plasma density inverse-exponentially and the beam energy linearly. Additionally, the rate changes with the plasma species and the plasma facing materials which effect impurity contamination of the plasma. An enhancement of beam stopping cross section by multistep collisions was also found even in a beam energy range of 40-75 keV.

Kuriyama, Masaaki; Kunieda, Shunsuke; Matsuoka, Mamoru; Mizuno, Makoto; Ohara, Yoshihiro; Oohara, Hiroshi; Mogaki, Kazuhiko

1993-03-01

38

TAE mode stabilization experiments in JT-60U  

NASA Astrophysics Data System (ADS)

It is found that low-n Toroidicity-Induced Alfven Eigen (TAE) modes excited by second harmonic ion cyclotron resonance heating can be stabilized by counter-tangential neutral beam injection in JT-60U. There are two possibilities as stabilizing mechanisms of the TAE modes. One is a phase mixing induced by shear in the plasma toroidal rotation, the other is a deformation of a radial structure of the TAE mode due to the toroidal rotation profile. The phase mixing is expected to be also effective for suppressing high-n TAE modes. Real-time control of TAE mode amplitude using the toroidal rotation control may be possible for burn control in a fusion reactor.

Saigusa, M.; Ozeki, T.; Kimura, H.; Kusama, Y.; Kramer, G. J.; Fujita, T.; Neyatani, Y.; Moriyama, S.; Azumi, M.; Koide, Y.; Cheng, C. Z.; Fu, G. Y.; Afanassiev, V. I.

1996-11-01

39

Advanced tokamak research with integrated modeling in JT-60 Upgrade  

NASA Astrophysics Data System (ADS)

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

Hayashi, N.; JT-60 Team

2010-05-01

40

Advanced tokamak research with integrated modeling in JT-60 Upgrade  

SciTech Connect

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

Hayashi, N. [Fusion Research and Development Directorate, Japan Atomic Energy Agency, Naka, Ibaraki 311-0193 (Japan)

2010-05-15

41

Reduction of Jt8d Powered Aircraft Noise by Engine Refanning.  

National Technical Information Service (NTIS)

The technical feasibility is described of substantially reducing the noise levels of existing JT8D powered aircraft by retrofitting the existing fleet with quieter refan engines and new acoustically treated nacelles. No major technical problems exist that...

L. E. Stitt A. A. Medeiros

1974-01-01

42

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

43

Comparisons of density profiles in JT-60U tokamak and LHD helical plasmas with low collisionality  

Microsoft Academic Search

In order to understand particle transport systematically in toroidal plasmas, electron density profiles were compared in JT-60U tokamak and LHD helical plasmas with low collisionality. The peakedness of density profiles increased with decreasing collisionality in ELMy H-mode plasmas of JT-60U when the collisionality at half the minor radius was in the collisionless regime. The collisionality dependence of density profiles in

H. Takenaga; K. Tanaka; K. Muraoka; H. Urano; N. Oyama; Y. Kamada; M. Yokoyama; H. Yamada; T. Tokuzawa; I. Yamada

2008-01-01

44

Status of JT-60SA tokamak under the EU-JA Broader Approach Agreement  

Microsoft Academic Search

JT-60SA is a fully superconducting coil tokamak to be built under the framework of the EU-JA Broader Approach Agreement, and it aims to contribute to the complement of the ITER experiments and to the DEMO reactor design by the study of steady-state high-beta plasma experiments. The conceptual design of the JT-60SA tokamak and the peripheral systems has been carried out

M. Matsukawa; M. Kikuchi; T. Fujii; T. Fujita; T. Hayashi; S. Higashijima; N. Hosogane; Y. Ikeda; S. Ide; S. Ishida; Y. Kamada; H. Kimura; K. Kizu; K. Kurihara; G. Kurita; K. Masaki; G. Matsunaga; N. Miya; S. Moriyama; A. Sakasai; S. Sakurai; Y. K. Shibama; K. Shimada; A. Sukegawa; T. Suzuki; Y. Suzuki; Y. Takase; M. Takechi; H. Tamai; K. Tsuchiya; H. Urano; T. Yamamoto; K. Yoshida; R. Andreani; J. Alonso; P. Barabaschi; J. Botija; P. Cara; A. Coletti; R. Coletti; P. Costa; A. Cucchiaro; P. Decool; A. Della Corte; N. Dolgetta; J.-L. Duchateau; W. H. Fietz; E. Gaio; A. Grosman; O. Gruber; R. Heller; D. Henry; P. Hertout; J. Hourtoule; B. Lacroix; R. Magne; M. Medrano; F. Michel; L. Muzzi; S. Nicollet; L. Novello; L. Petrizzi; R. Piovan; A. Pizzuto; C. Portafaix; E. Rincon; S. Roccella; L. Semeraro; S. Turtù; J.-M. Verder; S. Villari; L. Zani; A. Di Zenobio

2008-01-01

45

Electron 83Rb/83mKr Source for the Energy Scale Monitoring in the KATRIN Experiment  

NASA Astrophysics Data System (ADS)

The KATRIN (KArlsruhe TRItium Neutrino) experiment investigates the endpoint region of the tritium ?-spectrum aiming for the sensitivity on the neutrino mass of 0.2 eV (90% C.L.). A spectrometer of the MAC-E filter (Magnetic Adiabatic Collimation with an Electrostatic filter) type will be used for a total time of at least 5 years. An unrecognized shift of the filtering potential would directly influence the resulting neutrino mass. To continuously monitor the filtering potential the high voltage (HV) will be simultaneously applied to an additional MAC-E filter spectrometer. In this monitor spectrometer suitable electron sources based on atomic/nuclear standards will be utilized. As one of such monitoring tools the solid 83Rb/83mKr source is intended. It provides conversion electrons from 83mKr(t1/2 = 1.83 h) which is continuously generated by 83Rb(t1/2~=86 d). The Calibration and Monitoring task of the KATRIN project demands the long-term energy stability ?E/E of the K-32 conversion electron line (E = 17.8 keV, ? = 2.7 eV) of +/-1.6 ppm/month.

Zbo?il, Miroslav

2011-12-01

46

Control of Current Profile and Instability by Radiofrequency Wave Injection in JT-60U and Its Applicability in JT-60SA  

SciTech Connect

Recent results of control of current profile and instability using radiofrequency wave in JT-60U and prediction analysis in JT-60SA are descried. In JT-60U, control of current profile in high-beta regime was demonstrated by using a real-time system, where the motional Stark effect diagnostic and lower hybrid wave were used as a detector and actuator, respectively. The minimum value of the safety factor was raised from 1.3 to 1.7 so as to follow the commanded value. Complete stabilization of a neoclassical tearing mode (NTM) with the poloidal mode number m = 2 and the toroidal mode number n = 1 was demonstrated using electron cyclotron (EC) current drive. By scanning the location of EC current drive in detail, strong stabilization effect was found for misalignment less than about half of the full island width. In addition, destabilization of the 2/1 NTM was observed for misalignment comparable to the full island width. Simulation of NTM stabilization in JT-60SA was performed by using the TOPICS code combined with the modified Rutherford equation. The TOPICS simulation showed that complete stabilization can be achieved more effectively by optimizing the EC wave injection angle and modulating the EC wave.

Isayama, A.; Suzuki, T.; Hayashi, N.; Ide, S.; Hamamatsu, K.; Fujita, T.; Hosoyama, H.; Kamada, Y.; Oyama, N.; Ozeki, T.; Sakata, S.; Seki, M.; Sueoka, M.; Takechi, M.; Urano, H. [Japan Atomic Energy Agency, Naka, Ibaraki 311-0193 (Japan); Nagasaki, K. [Institute of Advanced Energy, Kyoto University, Uji, Kyoto 611-0011 (Japan)

2007-09-28

47

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

48

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.; Maréchal, J. L.; Michel, F.; Reynaud, P.; Roussel, P.; Wanner, M.

2010-04-01

49

Oxygen chemisorption compressor study for cryogenic J-T refrigeration  

NASA Astrophysics Data System (ADS)

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.

1987-06-01

50

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

SciTech Connect

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

Fahle, R.K.

1980-01-01

51

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

52

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

53

Overview of JT-60U results towards the resolution of key physics and engineering issues in ITER and JT-60SA  

Microsoft Academic Search

This paper presents an overview of recent results from JT-60U. Topics we particularly focus on are (1) the mechanism determining the rotation profile and the effect of rotation on\\/from transport and stability, (2) the edge localized mode (ELM) physics and active ELM control and (3) plasma–wall interactions. An analysis of the momentum transport showed that rotation with a high pressure

A. Isayama

2011-01-01

54

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

Federal Register 2010, 2011, 2012, 2013

...inspections: Adding eddy current inspections (ECIs) for web cooling holes in high-pressure...7J, -20, and -20J engines; Adding ECIs for web cooling holes and tierod holes...JT9D-59A and -70A engines; Adding ECIs for web cooling holes and tierod...

2011-11-22

55

Finite element-integral acoustic simulation of JT15D turbofan engine  

Microsoft Academic Search

An iterative finite element integral technique is used to predict the sound field radiated from the JT15D turbofan inlet. The sound field is divided into two regions: the sound field within and near the inlet which is computed using the finite element method and the radiation field beyond the inlet which is calculated using an integral solution technique. The velocity

K. J. Baumeister; S. J. Horowitz

1984-01-01

56

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

Microsoft Academic Search

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

T. Hayashi; T. Nishitani; M. Ishikawa

2004-01-01

57

Design Study of the Vertical Field Power Supply for JT-60.  

National Technical Information Service (NTIS)

The results of a basic design study of the vertical field power supply for JT-60 (JAERI large tokamak) are described. The objective of the study is to evaluate several types of power supply circuits for fast excitation and control of the vertical field. A...

K. Yabuno K . Tani R. Shimada H. Kishimoto

1977-01-01

58

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

59

Kinetic database of the JT-60 tokamak during 1985-1987 experiments.  

National Technical Information Service (NTIS)

Kinetic database during the ohmic and strong neutral beam heated discharges are analyzed for the discharges during 1985-1987 experimental period. The results are registered in the database system called 'DARTS' so that many scientists can access to the JT...

M. Kikuchi K. Kikuchi T. Aoyagi K. Tani

1991-01-01

60

Development of automatic control method for cryopump system for JT-60 neutral beam injector.  

National Technical Information Service (NTIS)

A cryopump system for JT-60 neutral beam injector (NBI) is composed of 14 cryopumps with the largest total pumping speed of 20000 m(sup 3)/s in the world, which are cooled by liquid helium through a long-distance liquid helium transferline of about 500 m ...

K. Shibanuma N. Akino M. Dairaku Y. Ohuchi T. Shibata

1991-01-01

61

Design Status of the Cryogenic System and Operation Modes Analysys of the JT-60SA Tokamak  

NASA Astrophysics Data System (ADS)

The JT-60SA project is part of the Broader Approach Programme signed between Japan and Europe. This superconducting upgrade of the existing JT-60U tokamak in Naka, Japan shall start operation in 2016 and shall support ITER exploitation and research towards DEMO fusion reactor. JT-60SA is currently in the basic design phase. The cryogenic system of JT-60SA shall provide supercritical helium to cool the superconducting magnets and their structures at 4.4 K, and the divertor cryopumps at a temperature of 3.7 K. In addition it shall provide refrigeration for the thermal shields at 80 K and deliver helium at 50 K for the current leads. The equivalent refrigeration capacity at 4.5 K will be about 10 kW. The refrigeration process has to be optimised for different operation modes. During the day, in plasma operation state, the refrigerator will cope with the pulsed heat loads which may increase up to 100% of the average power, representing a big challenge compared to other tokamaks. Fast discharge quenches of the magnets, the impact from baking of the vacuum vessel, cool down and warm up modes are presented from the cryogenic system point of view and their impact on the cryogenic design is described.

Roussel, P.; Hoa, C.; Lamaison, V.; Michel, F.; Reynaud, P.; Wanner, M.

2010-04-01

62

Review of JT-60U experimental results from February to October, 1995.  

National Technical Information Service (NTIS)

Renewed theme group organization started from October 1994 for the upcoming experiments in JT-60U. This regime has three theme groups each of which is composed of two sub-theme groups as; (1) Plasma Operation Theme (Leader Y. Neyatani) with Operation Sub-...

1996-01-01

63

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

Microsoft Academic Search

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

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

1990-01-01

64

Development and Operational Experiences of the JT-60U Tokamak and Power Supplies  

SciTech Connect

The design of the JT-60U tokamak, the configuration of the coil power supplies, and the operational experiences gained to date are reviewed. JT-60U is a large tokamak upgraded from the original JT-60 in order to obtain high plasma current, large plasma volume, and highly elongated divertor configurations. All components inside the toroidal magnetic field coils, such as vacuum vessel, poloidal magnetic field coils, divertor, etc., were modified. Various technologies and ideas were introduced to develop these components; for example, a multi-arc double skin wall structure for the vacuum vessel and a functional poloidal magnetic field coil system with taps for obtaining various plasma configurations. Furthermore, boron-carbide coated carbon fiber composite (CFC) tiles were used as divertor tiles to reduce erosion of carbon-base tiles. Later, a semiclosed divertor with pumps, for which cryo-panels originally used for NBI units were converted, was installed in the replacement of the open divertor. These development and operational results provide data for future tokamaks. Major failures experienced in the long operational period of JT-60U, such as water leakage from the toroidal magnetic field coil, fracture of carbon tiles, and breakdown of a filter capacitor, are described. As a maintenance issue for tokamaks using deuterium fueling gas, a method for reducing radiation exposure of in-vessel workers is described.

Hosogane, N. [Japan Atomic Energy Research Institute (Japan); Ninomiya, H. [Japan Atomic Energy Research Institute (Japan); Matsukawa, M. [Japan Atomic Energy Research Institute (Japan); Ando, T. [Japan Atomic Energy Research Institute (Japan); Neyatani, Y. [Japan Atomic Energy Research Institute (Japan); Horiike, H. [Osaka University (Japan); Sakurai, S. [Japan Atomic Energy Research Institute (Japan); Masaki, K. [Japan Atomic Energy Research Institute (Japan); Yamamoto, M. [Japan Atomic Energy Research Institute (Japan); Kodama, K. [Japan Atomic Energy Research Institute (Japan); Sasajima, T. [Japan Atomic Energy Research Institute (Japan); Terakado, T. [Japan Atomic Energy Research Institute (Japan); Ohmori, S. [Japan Atomic Energy Research Institute (Japan); Ohmori, Y. [Japan Atomic Energy Research Institute (Japan); Okano, J. [Japan Atomic Energy Research Institute (Japan)

2002-09-15

65

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.

Martin, Maria M.; Lopez-Gallardo, Esther; Sole-Violan, Jordi; Blanquer, Jose; Labarta, Lorenzo; Diaz, Cesar; Borreguero-Leon, Juan Maria; Jimenez, Alejandro; Montoya, Julio; Ruiz-Pesini, Eduardo

2013-01-01

66

Heating and Current Drive by N-NBI in JT-60U and LHD  

SciTech Connect

Two pilot facilities of advanced negative-ion-based neutral beam injection heating system have been working successfully on the JT-60U tokamak and the LHD heliotron in Japan. These were the first applications of negative-ion technology to the production of high current neutral beam for plasma heating as well as current drive. High energy deuterium beam of 400 keV (5.8 MW) was injected in JT-60U for efficient current drive, and high power hydrogen beam of 9.0 MW (160 keV) was injected in LHD producing high performance plasmas. These results demonstrate the feasibility of negative ion beam system for future fusion reactors such as ITER.

Kaneko, O. [National Institute for Fusion Science (Japan); Yamamoto, T. [Japan Atomic Energy Research Institute (Japan); Akiba, M. [Japan Atomic Energy Research Institute (Japan); Hanada, M. [Japan Atomic Energy Research Institute (Japan); Ikeda, K. [National Institute for Fusion Science (Japan); Inoue, T. [Japan Atomic Energy Research Institute (Japan); Nagaoka, K. [National Institute for Fusion Science (Japan); Oka, Y. [National Institute for Fusion Science (Japan); Osakabe, M. [National Institute for Fusion Science (Japan); Takeiri, Y. [National Institute for Fusion Science (Japan); Tsumori, K. [National Institute for Fusion Science (Japan); Umeda, N. [Japan Atomic Energy Research Institute (Japan); Watanabe, K. [Japan Atomic Energy Research Institute (Japan)

2003-09-15

67

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

NASA Astrophysics Data System (ADS)

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

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

2013-07-01

68

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

69

Non-dimensional threshold scaling of edge plasma quantities in JT-60U  

NASA Astrophysics Data System (ADS)

Exploratory work on scaling the H-mode threshold power with edge non-dimensional quantities was first undertaken based on the JT-60U H-mode database. Predominant edge 0741-3335/40/5/051/img1 dependence as well as the strong negative contribution of edge 0741-3335/40/5/051/img2 were found. Obtained scaling is consistent with the global parameter dependences and also satisfies the non-dimensional constraint.

Fukuda, T.; Takizuka, T.; Kamada, Y.; Tsuchiya, K.; Mori, M.; JT-60 Team

1998-05-01

70

Comparison of transient electron heat transport in LHD helical and JT-60U tokamak plasmas  

Microsoft Academic Search

Transient transport experiments are performed in plasmas with and without internal transport barriers (ITB) on LHD and JT-60U. The dependence of chie on the electron temperature, Te, and on the electron temperature gradient, ?Te, is analysed with an empirical non-linear heat transport model. In plasmas without an ITB, two different types of non-linearity of the electron heat transport are observed

S. Inagaki; H. Takenaga; K. Ida; A. Isayama; N. Tamura; T. Takizuka; T. Shimozuma; Y. Kamada; S. Kubo; Y. Miura; Y. Nagayama; K. Kawahata; S. Sudo; K. Ohkubo

2006-01-01

71

Recent results and modification program of JT-60 toward high integrated performance  

Microsoft Academic Search

The first half of this paper briefly describes the major achievements of the existing JT-60U machine, i.e., high-performance plasma with full noninductive current drive, long time sustainment of high-beta plasma, and real-time neoclassical tearing modes (NTM) suppression experiments. In addition, the ongoing minor modification of the pulse length prolongation for further enhancement of numerous plasma properties is mentioned. The second

Makoto Matsukawa

2004-01-01

72

Fast plasma shutdown scenarios in the JT-60U tokamak using intense mixed gas puffing  

Microsoft Academic Search

Fast plasma shutdown without runaway electron generation by gas puffing is investigated in the JT-60U tokamak. Argon-only injection enables a fast shutdown; however, it induces runaway electron generation. Hydrogen-only injection generates much less runaway electrons; however, the shutdown time is considerably longer. Mixed injection of hydrogen and argon achieves a fast plasma shutdown without runaway generation. Argon atoms contribute to

M. Bakhtiari; Y. Kawano; H. Tamai; Y. Miura; R. Yoshino; Y. Nishida

2002-01-01

73

Electron cyclotron resonance discharge cleaning by using LHRF system on JT-60U  

Microsoft Academic Search

Electron cyclotron resonance discharge cleaning (ECR-DC) has been studied on JT-60U in which the first wall is completely covered by graphite tiles. The radio frequency (RF) waves at 2 GHz band, which are generated by the lower hybrid range of frequency (LHRF) system, are applied to the ECR-DC at the toroidal magnetic field of around 0.06 T. RF power up

K Ushigusa; M Seki; K Suganuma; N Toyoshima; Y Ikeda

1999-01-01

74

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

75

Low electric field ? plasma-current start-up in JT-60U  

Microsoft Academic Search

Plasma breakdown for an electric field of 0741-3335\\/39\\/1\\/012\\/img2 (loop voltage of 1.7 V) was demonstrated in JT-60U using helium prefilling gas and LHRF heating. Runaway electrons were not generated even for the low prefilling pressure of 0741-3335\\/39\\/1\\/012\\/img3 required for plasma breakdown at low loop voltage. Preionization was not obtained by LHRF heating, but the time taken to pass the radiation

R. Yoshino; M. Seki

1997-01-01

76

Conceptual Design of Divertor Cassette Handling by Remote Handling System of JT-60SA  

NASA Astrophysics Data System (ADS)

The JT-60SA aims to contribute and supplement ITER toward demonstration fusion reactor based on tokamak concept. One of the features of JT-60SA is its high power long pulse heating, causing the large annual neutron fluence. Because the expected dose rate at the vacuum vessel (VV) may exceed 1 mSv/hr after 10 years operation and three month cooling, the human access inside the VV is restricted. Therefore a remote handling (RH) system is necessary for the maintenance and repair of in-vessel components. This paper described the RH system of JT-60SA, especially the expansion of the RH rail and exchange of the divertor cassettes. The RH rail is divided into nine and three-point mounting. The nine sections can cover 225 degrees in toroidal direction. A divertor cassette, which is 10 degrees wide in toroidal direction and weighs 500kg itself due to the limitations of port width and handling weight, can be exchanged by heavy weight manipulator (HWM). The HWM brings the divertor cassette to the front of the other RH port, which is used for supporting the rail and/or carrying in and out equipments. Then another RH device receives and brings out the cassette by a pallet installed from outside the VV.

Hayashi, Takao; Sakurai, Shinji; Masaki, Kei; Tamai, Hiroshi; Yoshida, Kiyoshi; Matsukawa, Makoto

77

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

SciTech Connect

Microfission chambers, which are pencil sized ionization chamber containing fissile material inside, will be installed in the vacuum vessel as neutron monitors for International Thermonuclear Experimental Reactor (ITER). We have performed first measurements of the detector installed between the vacuum vessel and toroidal coils on JT-60U. The technical validity as a neutron monitor, such as magnetic field effect and electromagnetic noises from the plasma and heating devices, has been investigated. The detector had an excellent linearity with a {sup 235}U fission chamber as a neutron monitor on JT-60U with the standard deviation of 3% except for some noise signals. The electromagnetic noises were caused by neutral beam injection (NBI) breakdowns, probably due to long wiring between the detector and the preamplifier. In case of plasma disruption, improper signals have not been observed. The magnetic field effect also has not been observed up to 2 T. In JT-60U, we confirmed availability of the micro fission chamber as a neutron monitor over three decades of neutron source strength up to 1.3x10{sup 16} neutrons/s with 1 ms temporal resolution. The biggest weakness in the detector was its noise sensitivity to NBI breakdowns. Therefore, by suppressing the electromagnetic noise, microfission chambers can be available as neutron monitors for ITER.

Hayashi, T.; Nishitani, T.; Ishikawa, M. [Japan Atomic Energy Research Institute, Naka-machi, Ibaraki 319-0193 (Japan)

2004-10-01

78

Modification of Tomography Technique for Two-Dimensional Spectroscopic Measurement in JT-60U Divertor Plasmas  

NASA Astrophysics Data System (ADS)

Tomography techniques using the two measurement arrays were investigated. To evaluate test reconstruction methods with three combinations of calculation grid and observation view lines, a model distribution was reconstructed. The two-dimensional distribution generated on a calculation grid arranged parallel to the actual apparatus view lines was in better agreement with the model distribution than the distribution generated on a square grid. This parallel grid was applied to the reconstruction of the deuterium Balmer-series lines in the JT-60U detached divertor plasmas.

Fujimoto, K.; Nakano, T.; Kubo, H.; Sawada, K.; Takizuka, T.; Shimizu, K.; Kawashima, H.; Asakura, N.

79

Reduction of ion thermal diffusivity inside a magnetic island in JT-60U tokamak plasma.  

PubMed

A peaked ion temperature profile is observed inside the magnetic island during mode locking after the back transition from H mode to L mode in JT-60U. The thermal diffusivity evaluated inside the magnetic island is 0.1 m(2)/s, which is much smaller than that outside the magnetic island by an order of magnitude. The present experiment gives clear evidence that ion heat transport inside a magnetic island can bifurcate and the transport level can be suppressed to the very low level associated with the strong flow shear at the boundary. PMID:23006274

Ida, K; Kamiya, K; Isayama, A; Sakamoto, Y

2012-08-07

80

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

81

High Beta Steady State Research and Future Directions on JT-60U and JFT-2M  

NASA Astrophysics Data System (ADS)

JT-60U and JFT-2M research is focused on high beta steady state operation towards economically and environmentally attractive reactors. In JT-60U, a high-?p H-mode plasma was sustained with ?N 2.7 for 7.4 s in which neoclassical tearing modes (NTMs) limited the attainable ?_N. Real-time tracking NTM stabilization system using ECCD demonstrated complete suppression of NTM leading to recovery of ?N before onset of NTM. Performance in a fully non-inductive H-mode plasma was improved up to n_i(0) ?E T_i(0) = 3.1 x 10^20 keV s m-3 using N-NBCD with ?N 2.4, HH_y,2=1.2 and bootstrap fraction f_BS 0.5. ECH experiments extended the confinement enhancement for dominantly electron heated reversed shear plasmas up to HH_y,2 2 at T_e/Ti 1.25. A world record ECCD efficiency, 4.2 x 10^18 A/W/m^2, was achieved at Te 23 keV with a highly localized central current density. Innovative initiation and current build-up without center solenoid currents were established by LHCD/ECH and bootstrap current up to f_BS 0.9. In JFT-2M, the inside of the vacuum vessel wall was fully covered with low-activation ferritic steel plates to investigate their use in plasmas near fusion conditions. High ?N plasmas were produced up to ?N = 3.3 with an internal transport barrier (ITB) and a steady H-mode edge. A new H-mode regime with steady high recycling (HRS) and an ITB was exploited leading to ?N H_89P 6.2 at n_e/nG 0.7. In 2003, JT-60U will be able to operate for the duration up to 65 s at 1 MA/2.7 T and the heating/current-drive duration up to 30 s at 17 MW to prolong high-?N and/or high-f_BS discharges with feedback controls. JFT-2M is planning to implement wall stabilization experiments in 2004 to pursue plasmas above the ideal no-wall limit using a ferritic wall. The modification of JT-60 to a fully superconducting tokamak is under discussion to explore high-? steady state operation in collision-less plasmas well above no-wall limit with ferritic wall in a steady state.

Ishida, Shinichi

2003-10-01

82

Design of collection optics and polychromators for a JT-60SA Thomson scattering system  

SciTech Connect

This paper presents designs of collection optics for a JT-60SA Thomson scattering system. By using tangential (to the toroidal direction) YAG laser injection, three collection optics without strong chromatic aberration generated by the wide viewing angle and small design volume were found to measure almost all the radial space. For edge plasma measurements, the authors optimized the channel number and wavelength ranges of band-pass filters in a polychromator to reduce the relative error in T{sub e} by considering all spatial channels and a double-pass laser system with different geometric parameters.

Tojo, H.; Hatae, T.; Sakuma, T.; Hamano, T.; Itami, K. [Japan Atomic Energy Agency, 801-1 Mukoyama, Naka 311-0193 (Japan); Aida, Y.; Suitoh, S.; Fujie, D. [Showa Optronics Co., Ltd., 1-22-1 Hakusan, Midori-ku, Yokohama 226-0006 (Japan)

2010-10-15

83

Avoidance of VDEs during plasma current quench in JT-60U  

NASA Astrophysics Data System (ADS)

Vertical displacement events (VDEs) during plasma current quench (Irho quench) are one of the serious problems encountered in designing tokamak fusion reactors, owing to the generation of enormously high electromagnetic forces on the vacuum vessel and in-vessel components, but they have been passively and actively avoided in JT-60U. In JT-60U `slow IP quench` is ended with very fast plasma current termination (final Irho termination), and the halo current is frequently measured at this final Irho termination. VDEs make the final Irho termination severe by increasing the halo current and the electromagnetic force. A strong dependence of VDE growth rate on the initial vertical position of the plasma current centre (ZJ) has been clarified experimentally, and a neutral point of ZJ for VDE has been found at ~15 cm above the midplane of the vacuum vessel. According to these measurements, VDE has been avoided by the selection of ZJ at the start of Irho quench (passive control) and by the control of ZJ during Irho quench (active control) eventually obtained owing to the small deviation of ZJ in real time calculations from its actual value. Furthermore, passive avoidance of VDEs by the injection of a neon ice pellet has been demonstrated

Yoshino, R.; Nakamura, Y.; Neyatani, Y.

1996-03-01

84

Use of an Air-Assisted Fuel Nozzle to Reduce Idle Emissions of a Jt8d Engine Combustor.  

National Technical Information Service (NTIS)

Tests were performed at typical engine idle conditions on a single-can JT8D combustor installed in a 24 centimeter (9.45 in.) housing to evaluate the effect of an air-assist nozzle on reducing exhaust emissions. By injecting high-pressure air through the ...

L. C. Papathakos R. E. Jones

1973-01-01

85

Finite element-integral simulation of static and flight fan noise radiation from the JT15D turbofan engine  

Microsoft Academic Search

An iterative finite element integral technique is used to predict the sound field radiated from the JT15D turbofan inlet. The sound field is divided into two regions: the sound field within and near the inlet which is computed using the finite element method and the radiation field beyond the inlet which is calculated using an integral solution technique. The velocity

K. J. Baumeister; S. J. Horowitz

1982-01-01

86

MHD Activity near the Internal Transport Barrier in JT-60U and TFTR Reversed Shear Configurations  

NASA Astrophysics Data System (ADS)

In JT-60U and TFTR reversed shear configurations, an off-axis sawtooth crash or a localized mini-collapse has been observed near the internal transport barrier. Since a sequence of mini-collapses sometimes trigger a major disruption which hinders high performance, we have categorized the localized MHD behavior to identify the cause of the mini-collapses. The mode structure was analyzed by using ECE grating polychromators, Mirnov coils and MSE polarimeters in both devices. The possible candidates are the single/double tearing modes in the resistive regime, the off-axis fishbone-like modes in the ideal MHD regime and the bursting mode accompanied by high frequency (100--200 kHz) excited at q_min = 3, 2 .

Isayama, A.; Fujita, T.; Isei, N.; Ishida, S.; Ishii, Y.; Kamada, Y.; Kramer, G. J.; Matsuda, T.; Ozeki, T.; Shirai, H.; Takeji, S.; Bell, M.; Bell, R.; Fredrickson, E.; Gorelenkov, N.; Manickam, J.; Okabayashi, M.; Taylor, G.; White, R.; Levinton, F.

1998-11-01

87

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

NASA Astrophysics Data System (ADS)

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.

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

2010-10-01

88

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

89

Observation of divertor and core radiation in JT-60U by means of bolometric imaging  

NASA Astrophysics Data System (ADS)

An imaging bolometer has been realized for the first time on a tokamak (JT-60U). The imaging bolometer utilizes a 7 cm × 9 cm × 2.5 ?m gold foil and an Omega/Micron infrared (IR) camera by Indigo/FLIR (128 × 164 pixels, 70 mK, 30 fps). The imaging bolometer has an array of 12 (toroidal) × 16 (poloidal) (192 in total) channels, a noise equivalent power density of greater than 350 ?W/cm2 and a frame rate of 30 fps. The field of view of the imaging bolometer is semi-tangential covering the divertor for more than 100° toroidally in addition to the entire poloidal cross-section. The data clearly shows examples of the radiation changing from strong divertor radiation to core dominated radiation in agreement with the resistive bolometer data.

JT-60U Team; Peterson, B. J.; Konoshima, S.; Parchamy, H.; Kaneko, M.; Omori, T.; Seo, D. C.; Ashikawa, N.; Sukegawa, A.; JT-60U Teamb

2007-06-01

90

Fully predictive time-dependent transport simulations of ITB plasmas in JET, JT-60U and DIII-D  

Microsoft Academic Search

For the first time, the predictive capabilities of the mixed Bohm\\/GyroBohm, Weiland and 'retuned' GLF23 transport models are investigated with ITB discharges from the ITPA ITB database with fully predictive, time-dependent transport simulations. A range of plasma conditions is examined for JET, JT-60U and DIII-D discharges with internal transport barriers (ITBs). The simulations show that the Bohm\\/GyroBohm model is able

T. Tala; F. Imbeaux; V. V. Parail; C. Bourdelle; G. Corrigan; X. Garbet; D. J. Heading; X. Litaudon; P. I. Strand; J. Weiland; JET-EFDA contributors

2006-01-01

91

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

Microsoft Academic Search

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

H. F. Butze; C. H. Liebert

1976-01-01

92

Study on development of double metal-sealed gate valve for the JT-60 radio frequency heating system  

Microsoft Academic Search

The prospect of developing a 750-mm gate valve for the JT-60 radio frequency heating system is discussed. In order to decrease the sealing force applied to the gasket, a sealing system with two H-type gaskets and intermediate vacuum chamber (double seal type design) is planned. Tests for 103 cycles repeated operation at room temperature and 150°C with a full-scale model

M. Minami; T. Imai; H. Morita; T. Nagashima

1984-01-01

93

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

SciTech Connect

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

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

2008-03-12

94

Carbon transport and fuel retention in JT-60U with high temperature operation based on postmortem analysis  

NASA Astrophysics Data System (ADS)

Fuel retention rates and carbon re-deposition rates in the plasma shadowed areas, or tile gaps and remote areas, in JT-60U were measured. The total fuel retention rate in the plasma shadowed areas was more than two times higher than that in the carbon re-deposited layers on the plasma facing surfaces, or the divertor tiles. This is because of lower temperature in the plasma shadowed areas than in the plasma facing surfaces, which leads to high hydrogen saturation concentration, although the amount of the carbon re-deposited on the plasma shadowed areas was only 60% of that on the plasma facing surfaces. The total fuel retention rate in JT-60U, including previously determined for all the plasma facing areas, was evaluated to be 1.3 × 1020 H + D s-1, and this retention rate was lower than that in the other devices, due probably to high baking temperature operation in JT-60U. Distributions of the fuel retention and the carbon re-deposition in the whole in-vessel of a large tokamak were determined for the first time in the world.

Yoshida, M.; Tanabe, T.; Adachi, A.; Hayashi, T.; Nakano, T.; Fukumoto, M.; Yagyu, J.; Miyo, Y.; Masaki, K.; Itami, K.

2013-07-01

95

Thermal properties of redeposition layers in the JT-60U divertor region  

NASA Astrophysics Data System (ADS)

Thermal properties of the redeposition layer on the inner plate of the W-shaped divertor of JT-60U have been measured with laser flash method so as to estimate transient heat loads onto the divertor. Morphology analysis of the redeposition layer was conducted with a scanning electron microscope. Measurement of a redeposition layer sample of more than 200 ?m thick, which had been produced near the most frequent striking point, showed following results: (1) the bulk density of the redeposition layer is about half of that of carbon fiber composite material; (2) the specific heat of the layer is roughly equal to that of the isotropic graphite; (3) the thermal conductivity of the redeposition layer is two orders of magnitude smaller than that of the carbon fiber composite. This low thermal conductivity of the redeposition layer is considered to be caused by a low graphitization degree of the redeposition layer. The difference between the divertor heat loads and the loss of the plasma stored energy becomes smaller taking account of thermal properties of the redeposition layer on the inner divertor, whereas estimated heat loads due to the ELMs is still larger than the loss. This is probably caused by the poloidal distribution of the thermal properties.

Ishimoto, Y.; Gotoh, Y.; Arai, T.; Masaki, K.; Miya, N.; Oyama, N.; Asakura, N.

2006-05-01

96

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

NASA Astrophysics Data System (ADS)

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.

1983-05-01

97

Localized MHD activity near internal transport barriers in JT-60U and TFTR  

NASA Astrophysics Data System (ADS)

Localized MHD activity observed in JT-60U and TFTR near transport barriers with their associated large pressure gradients is investigated. Stability analysis of equilibria modelling the experiments supports an identification of the MHD activity as being due to an ideal MHD n = 1 instability. Theoretical models are used to identify the dependence of the instability on the salient features of the plasma profiles: the local pressure gradient, local shear in the q profile and the proximity of rational surfaces where q approx m/n, with m and n the poloidal and toroidal mode numbers, respectively. The mode width is shown to depend on the value of q where the pressure gradient is largest, and increases as q decreases. The edge current density is shown to play an important role in coupling the internal mode to the plasma edge. Energetic particles in these neutral beam heated discharges are shown to drive fishbone-like modes when they exist in sufficient numbers in the vicinity of the maximum perturbation owing to the ideal instability.

Manickam, J.; Fujita, T.; Gorelenkov, N.; Isayama, A.; Kamada, Y.; Okabayashi, M.; Bell, M.; Bell, R.; Budny, R.; Fredrickson, E.; Ishida, S.; Ishii, Y.; Levinton, F.; Ozeki, T.; Shirai, H.; Takeji, S.; Zarnstorff, M.

1999-11-01

98

Recovery of Retained Tritium from Graphite Tile of JT-60U  

SciTech Connect

Tritium thermal release and full combustion with oxygen were performed on isotropic graphite tiles used for plasma facing material of JT-60U. Approximately 50-80 % of tritium was released by dry argon gas purge and 20-50 % of tritium was released by humid argon gas purge up to 800-1200 deg. C within one day, respectively. Further several percent of tritium was released by full combustion with oxygen. It was experimentally confirmed that all retained tritium is not released by thermal dry gas purge and by use of isotope exchange reaction at high temperature in such a short period. In the full combustion operation, isotropic graphite begins to combust at higher temperature than 650 deg. C, but effective combustion temperature was higher than 700 deg. C. Since it is very difficult to heat the graphite tile attached on the wall of vacuum vessel at higher than 700 deg. C, it is considered to be not easy to recover all the tritium retained in the graphite while in the vacuum vessel.

Takeishi, Toshiharu [Kyushu University (Japan); Katayama, Kazunari [Kyushu University (Japan); Nishikawa, Masabumi [Kyushu University (Japan); Miya, Naoyuki [Naka Fusion Research Establishment (Japan); Masaki, Kei [Naka Fusion Research Establishment (Japan)

2005-07-15

99

Progress of Electron Cyclotron Heating / Current Drive Technology in JT-60U  

NASA Astrophysics Data System (ADS)

A key issue in attaining high plasma performance in the Tokamaks is the optimization of current profile, involving such functions as stabilizing the neo-classical tearing mode (NTM) and control of the internal transport barrier (ITB). In the JT-60U, a high power electron cyclotron heating (ECH) system at 110 GHz has been developed for local plasma heating and current drive. We have demonstrated the technical feasibility of an antenna which can scan EC beam in both the toroidal and poloidal directions. The toroidal scan enabled co- and counter- current drive and also pure plasma heating. Automatic stabilization of the NTM was demonstrated by means of current drive at the magnetic island employing feedback control of the poloidal beam angle. The total injected power has been extended to 2.8 MW for 3.6 sec and each gyrotron delivers ˜ 1 MW for 5 sec. This world record regarding the injection energy was attained by an upgrade of the gyrotron using an RF absorber in the beam tunnel to suppress the parasitic oscillation and to improve the transmission efficiency of the waveguide system.

Moriyama, Shinichi; Ikeda, Yoshitaka; Seki, Masami; Sakamoto, Keishi; Kasugai, Atsushi; Takahashi, Koji; Kajiwara, Ken; Isayama, Akihiko; Suzuki, Takahiro; Fukuda, Takeshi; Ide, Shunsuke; Imai, Tsuyoshi; Fujii, Tsuneyuki

100

Investigation of carbon dust accumulation in the JT-60U tokamak vacuum vessel  

NASA Astrophysics Data System (ADS)

Dust generated by plasma-wall interaction is a potential source of tritium retention in a fusion reactor. Evaluation of the dust accumulation in the entire vacuum vessel is required to estimate the total amount of tritium retention, but it was particularly difficult to measure for plasma-unexposed areas behind the PFC structures, i.e. "shadow areas". Dust samples were collected at 3, 5 and 2-4 different toroidal locations on the first wall, divertor surface and the exhaust route under the divertor in JT-60U, respectively. On the tile surface, large mass area density was found at the inner divertor and baffle, in particular, upper tiles compared to the lower target tile where the thick deposition layers were produced. Mass area density was significantly increased at the shadow areas, i.e. under the divertor structure such as the divertor and baffle tiles and the divertor dome. It was found that the poloidal distribution is relatively symmetrical in the toroidal direction within a factor of three. In comparison with the previous collection just before major change of the plasma operations, dust accumulation was increased both at the exposed and shadow areas due to change in the operating conditions.

Asakura, N.; Hayashi, T.; Ashikawa, N.; Fukumoto, M.

2013-07-01

101

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

PubMed

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

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

2009-09-30

102

Characterization of sorption compressor for mixed refrigerant J-T cryocooler  

NASA Astrophysics Data System (ADS)

The requirement of a cryocooler with minimum vibrations for space borne system and highly sophisticated electronic devices for ground application, has led to the development of sorption compressor type J-T cryocooler. The adsorption capacity of any adsorbent material increases with an increase in pressure and decreases with an increase in temperature. In a Sorption compressor, adsorbed gases are desorbed in a confined volume by raising temperature of the sorption bed which results in increase in pressure of gas. A uniform temperature across the sorption bed ensures maximum discharge from the compressor amounting to higher flow rates and longer cycle time on account of reduced residual loading. In addition, it is also very important to determine the adsorption capacity of any material with respect to the gas or gases to be adsorbed as this varies with source of the adsorbent. The present work reports the characterization of a fully operational two-cell sorption compressor developed. The sorption compressor is characterized for discharge pressure variation with cycle time; this is essentially a function of a) the amount of adsorbent, b) the adsorption capacity for respective gas or gases, c) desorption temperature and its uniformity, and d) system dead volume. The present paper analyses these aspects theoretically and the results are compared with the experimental data obtained for individual gases as well as for gas mixtures. The effect of gas distribution on temperature uniformity across the bed and of heater power on high pressure generated is also studied. The paper also discusses the pressure profile obtained for a given amount of adsorbent for different gas or gas mixture. The work, based on the results obtained so far is being further extended for a four cell sorption compressor.

Mehta, Rohitkumar; Bapat, Shridhar; Atrey, Milind

2012-06-01

103

Plasma equilibrium control during slow plasma current quench with avoidance of plasma-wall interaction in JT-60U  

NASA Astrophysics Data System (ADS)

In JT-60U a vertical displacement event (VDE) is observed during slow plasma current quench (Ip quench) for a vertically elongated divertor plasma with a single null. The VDE is generated by an error in the feedback control of the vertical position of the plasma current centre (ZJ). It has been perfectly avoided by improving the accuracy of the ZJ measurement in real time. Furthermore, plasma-wall interaction has been avoided successfully during slow Ip quench owing to the good performance of the plasma equilibrium control system

Yoshino, R.; Nakamura, Y.; Neyatani, Y.

1997-08-01

104

Fast collimated neutron flux measurement using stilbene scintillator and flashy analog-to-digital converter in JT-60U  

SciTech Connect

A line-integrated neutron emission profile is routinely measured using the radial neutron collimator system in JT-60U tokamak. Stilbene neuron detectors (SNDs), which combine a stilbene organic crystal scintillation detector (SD) with an analog neutron-gamma pulse shape discrimination (PSD) circuit, have been used to measure collimated neutron flux. Although the SND has many advantages as a neutron detector, the maximum count rate is limited up to {approx}1x10{sup 5} counts/s due to the analog PSD circuit. To overcome this issue, a digital signal processing system (DSPS) using a flash analog-to-digital converter (Acqiris DC252, 8 GHz, 10 bits) has been developed at Cyclotron and Radioisotope Center in Tohoku University. In this system anode signals from photomultiplier of the SD are directory stored and digitized. Then, the PSD between neutrons and gamma rays is performed using software. The DSPS has been installed in the vertical neutron collimator system in JT-60U and applied to deuterium experiments. It is confirmed that the PSD is sufficiently performed and collimated neutron flux is successfully measured with count rate up to {approx}5x10{sup 5} counts/s without the effect of pileup of detected pulses. The performance of the DSPS as a neutron detector, which supersedes the SND, is demonstrated.

Ishikawa, M.; Itoga, T.; Okuji, T.; Nakhostin, M.; Shinohara, K.; Hayashi, T.; Sukegawa, A.; Baba, M.; Nishitani, T. [Cyclotron and Radioisotope Center, Tohoku University, Aoba 6-3, Sendai, Miyagi 980-8578 (Japan); Japan Atomic Energy Agency, Mukoyama 801-1 Naka-shi, Ibaraki 311-0193 (Japan); Cyclotron and Radioisotope Center, Tohoku University, Aoba 6-3, Sendai, Miyagi 980-8578 (Japan); Japan Atomic Energy Agency, Mukoyama 801-1 Naka-shi, Ibaraki 311-0193 (Japan)

2006-10-15

105

Acceleration of 500 keV Negative Ion Beams By Tuning Vacuum Insulation Distance On JT-60 Negative Ion Source  

SciTech Connect

Acceleration of a 500 keV beam up to 2.8 A has been achieved on a JT-60U negative ion source with a three-stage accelerator by overcoming low voltage holding which is one of the critical issues for realization of the JT-60SA ion source. In order to improve the voltage holding, preliminary voltage holding tests with small-size grids with uniform and locally intense electric fields were carried out, and suggested that the voltage holding was degraded by both the size and local electric field effects. Therefore, the local electric field was reduced by tuning gap lengths between the large size grids and grid support structures of the accelerator. Moreover, a beam radiation shield which limited extension of the minimum gap length was also optimized so as to reduce the local electric field while maintaining the shielding effect. These modifications were based on the experiment results, and significantly increased the voltage holding from <150 kV/stage for the original configuration to 200 kV/stage. These techniques for improvement of voltage holding should also be applicable to other large ion sources accelerators such as those for ITER.

Kojima, A.; Hanada, M.; Tanaka, Y.; Taniguchi, M.; Kashiwagi, M.; Inoue, T.; Umeda, N.; Watanabe, K.; Tobari, H. [Japan Atomic Energy Agency, 801-1, Mukoyama, Naka 311-0193 (Japan); Kobayashi, S.; Yamano, Y. [Saitama University, Saitama, Saitama-ken, 338-8570 (Japan); Grisham, L. R. [Princeton Plasma Physics Laboratory, Princeton, NJ 08543 (United States)

2011-09-26

106

A beta-galactoside alpha2,6-sialyltransferase produced by a marine bacterium, Photobacterium leiognathi JT-SHIZ-145, is active at pH 8.  

PubMed

A gene encoding a sialyltransferase produced by Photobacterium leiognathi JT-SHIZ-145 was cloned, sequenced, and expressed in Escherichia coli. The sialyltransferase gene contained an open reading frame of 1494 base pairs (bp) encoding a predicted protein of 497 amino acid residues. The deduced amino acid sequence of the sialyltransferase had no significant similarity to mammalian sialyltransferases and did not contain sialyl motifs, but did show high homology to another marine bacterial sialyltransferase, a beta-galactoside alpha2,6-sialyltransferase produced by P. damselae JT0160. The acceptor substrate specificity of the new enzyme was similar to that of the alpha2,6-sialyltransferase from P. damselae JT0160, but its activity was maximal at pH 8. This property is quite different from the properties of all mammalian and bacterial sialyltransferases reported previously, which have maximal activity at acidic pH. In general, both sialosides and cytidine-5'-monophospho-N-acetylneuraminic acid, the common donor substrate of sialyltransferases, are more stable under basic conditions. Therefore, a sialyltransferase with an optimum pH in the basic range should be useful for the preparation of sialosides and the modification of glycoconjugates, such as asialo-glycoproteins and asialo-glycolipids. Thus, the sialyltransferase obtained from P. leiognathi JT-SHIZ-145 is a promising tool for the efficient production of sialosides. PMID:17704107

Yamamoto, Takeshi; Hamada, Yoko; Ichikawa, Masako; Kajiwara, Hitomi; Mine, Toshiki; Tsukamoto, Hiroshi; Takakura, Yoshimitsu

2007-08-17

107

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

National Technical Information Service (NTIS)

In JT-60U, B(sub 4)C-overlaid C/C composites are under investigation for the divertor tile application. The tiles will be exposed to severe heat loads, which are estimated to be around 10 MW/m(sup 2) for 5s in case of normal plasma operation and 2-3 MJ/m(...

K. Nakamura M. Akiba S. Suzuki

1992-01-01

108

Reduction of L-H transition threshold power under the W-shaped pumped divertor geometry in JT-60U  

NASA Astrophysics Data System (ADS)

A remarkable reduction of the L-H threshold power was observed in JT-60U under the W-shaped pumped divertor geometry, in comparison with the results for the previous open divertor. The density range was extended to 0.6nGWL ( = Ip/?a2), where a stronger than linear density dependence was found. A reduction of the radiation power and edge temperature as well as a nonlinear increase in edge density were also observed. The poloidal distribution of the neutral particle density was first examined in this work, and it was found that compression of neutral particles near the X-point or loss of homogeneity on a flux surface produced by the modification of the divertor geometry may be an influential determinant of the L-H threshold power.

Fukuda, T.; Takizuka, T.; Tsuchiya, K.; Kamada, Y.; Asakura, N.

2000-05-01

109

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

110

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

SciTech Connect

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

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

2008-02-15

111

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

PubMed

Neutral beam injection (NBI) used for JT-60U is required to generate negative ions of 500 keV energies. To produce such high-energy ions, three-stage electrostatic accelerators consisting of three insulator rings made of fiberglass reinforced plastic (FRP) are applied. The surface discharges along FRP insulators are one of the most serious problems in the development of NBI. To increase the hold-off voltage against surface flashover events, it is necessary to investigate the FRP insulator properties related to surface discharges in vacuum. This paper describes surface flashover characteristics for FRP and alumina samples under vacuum condition. The results show that the fold-off voltages for FRP samples are inferior to those of alumina ceramics. In addition, measurement results of surface resistivity and volume resistivity under vacuum and atmospheric conditions, secondary electron emission characteristics, and cathodoluminescence under some keV electron beam irradiation are also reported. These are important parameters to analyze surface discharge of insulators in vacuum. PMID:18315145

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

2008-02-01

112

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

SciTech Connect

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

Yamano, Y.; Takahashi, M.; Kobayashi, S.; Hanada, M.; Ikeda, Y. [School of Science and Engineering, Saitama University (Japan); Japan Atomic Energy Agency (Japan)

2008-02-15

113

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

114

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

NASA Astrophysics Data System (ADS)

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.

2013-09-01

115

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

PubMed

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. PMID:24089827

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

2013-09-01

116

Sawtooth stabilization experiments by ICRF heating alone and its combination with NBI or LHCD in JT-60U  

NASA Astrophysics Data System (ADS)

Extension of an operation range for the sawtooth stabilization by a second harmonic minority ion ICRF heating is being pursued in JT-60U. The sawtooth stabilization is obtained at relatively high density (ne~3.8×1019 m-3) and low-q (qeff=4 at Ip=2.4 MA) for OH target plasmas with only 2.8 MW of ICRF power. The sawtooth stabilization is thus obtained at high /Ptot value of 0.8×1019 m-3 mW-1, which is notably larger than the value achieved on JET, where fundamental resonance minority ion heating is employed. Another peculiar effect of the second harmonic heating is that stabilization occurs only after the inversion radius expands sufficiently, i.e., rinv/a>=0.26. The sawtooth stabilization by ICRF heating becomes easier with NBI-heated target plasmas (longest stable period up to 1.7 sec), while it tends to be difficult with the LHCD target plasmas.

Kimura, H.; Fujii, T.; Sato, M.; Nemoto, M.; Hamamatsu, K.; Kondoh, T.; Matsuoka, M.; Moriyama, S.; Saigusa, M.; Takeuchi, H.; Ushigusa, K.; Campbell, D. J.

1994-10-01

117

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

Microsoft Academic Search

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-betaN 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-betaN low-rotation plasmas,

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

2011-01-01

118

Penicillopepsin-JT2, a recombinant enzyme from Penicillium janthinellum and the contribution of a hydrogen bond in subsite S3 to k(cat).  

PubMed Central

The nucleotide sequence of the gene (pepA) of a zymogen of an aspartic proteinase from Penicillium janthinellum with a 71% identity in the deduced amino acid sequence to penicillopepsin (which we propose to call penicillopepsin-JT1) has been determined. The gene consists of 60 codons for a putative leader sequence of 20 amino acid residues, a sequence of about 150 nucleotides that probably codes for an activation peptide and a sequence with two introns that codes for the active aspartic proteinase. This gene, inserted into the expression vector pGPT-pyrG1, was expressed in an aspartic proteinase-free strain of Aspergillus niger var. awamori in high yield as a glycosylated form of the active enzyme that we call penicillopepsin-JT2. After removal of the carbohydrate component with endoglycosidase H, its relative molecular mass is between 33,700 and 34,000. Its kinetic properties, especially the rate-enhancing effects of the presence of alanine residues in positions P3 and P2' of substrates, are similar to those of penicillopepsin-JT1, endothiapepsin, rhizopuspepsin, and pig pepsin. Earlier findings suggested that this rate-enhancing effect was due to a hydrogen bond between the -NH- of P3 and the hydrogen bond accepting oxygen of the side chain of the fourth amino acid residue C-terminal to Asp215. Thr219 of penicillopepsin-JT2 was mutated to Ser, Val, Gly, and Ala. Thr219Ser showed an increase in k(cat) when a P3 residue was present in the substrate, which was similar to that of the wild-type, whereas the mutants Thr219Val, Thr219Gly, and Thr219Ala showed no significant increase when a P3 residue was added. The results show that the putative hydrogen bond alone is responsible for the increase. We propose that by locking the -NH- of P3 to the enzyme, the scissile peptide bond between P1 and P1' becomes distorted toward a tetrahedral conformation and becomes more susceptible to nucleophilic attack by the catalytic apparatus without the need of a conformational change in the enzyme.

Cao, Q. N.; Stubbs, M.; Ngo, K. Q.; Ward, M.; Cunningham, A.; Pai, E. F.; Tu, G. C.; Hofmann, T.

2000-01-01

119

Characteristics of confinement and fusion reactivity in JT-60U high-{beta}{rho} and TFTR supershot regimes with deuterium neutral beam injection  

SciTech Connect

The high performance regimes achieved in JT-60U and TFTR have produced peak DD fusion neutron rates up to 5.6 {times} 10{sup 16}/s for similar heating beam powers, in spite of considerable differences in machine operation and plasma configuration. A common scaling for the DD fusion neutron rate (S{sub DD} {proportional_to} P{sub abs}{sup 2.0} H{sub ne} V{sub p}{sup {minus}0.9}) is obtained, where P{sub abs} and H{sub ne} are the absorbed beam power and beam fueling peaking factor, respectively, and V{sub p} is the plasma volume. The maximum stored energy obtained in each machine has been up to 5.4 MJ in TFTR and 8.7 MJ in JT-60U. Further improvements in the fusion neutron rate and the stored energy are limited by the {beta}-limit in Troyon range, {beta}{sub N} {approximately} 2.0--2.5. A common scaling for the stored energy (W{sub tot} {proportional_to} P{sub abs}V{sub p}H{sub ne}{sup 0.2}) is also proposed.

Park, H.K.; Bell, M.G.; Yamada, M.

1995-03-01

120

Development of a 500 keV, 22 A D{sup {minus}} ion source for the neutral beam injector for JT-60U  

SciTech Connect

The first results of the performance test of the large negative ion source for a JT-60U negative-ion-based neutral beam injector (N-NBI) are presented. The ion source consists of a cesium seeded multicusp plasma generator, where negative ions are produced via volume and surface processes, a 110 cm{times}45 cm multiaperture extractor, and a three-stage electrostatic accelerator. After negative ion production and voltage holding tests in test stands, the ion source was installed in the N-NBI system and the full power test began. Up to now, the ion source has produced 400 keV, 5.9 A (2.4 MW) D{sup {minus}} ion beams, the world highest D{sup {minus}} current and beam power, with a pulse duration of 0.1 s. {copyright} {ital 1996 American Institute of Physics.}

Okumura, Y.; Fujiwara, Y.; Honda, A.; Inoue, T.; Kuriyama, M.; Miyamoto, K.; Miyamoto, N.; Mogaki, K.; Nagase, A.; Ohara, Y.; Usui, K.; Watanabe, K. [Japan Atomic Energy Research Institute, Naka-machi, Naka-gun, Ibaraki-ken, 311-01 (Japan)

1996-03-01

121

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

NASA Astrophysics Data System (ADS)

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

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

2011-08-01

122

The unified effect of counter-toroidal rotation and power across separatrix on type-I ELMs in JT-60U  

NASA Astrophysics Data System (ADS)

By conducting power scan experiments using perpendicular neutral beams (NBs) after the injection of tangential NBs in directions co-, balanced and counter to the plasma current, the unified effect of counter-toroidal rotation and heating power on type-I edge-localized modes (ELMs) was investigated in a JT-60U tokamak. ELM frequency fELM increased monotonically together with the power across the separatrix Psep for all the cases of tangential NBs. However, dependence of fELM on Psep was explicitly stronger than a simple proportionality when perpendicular NBs were injected. The toroidal rotation velocity at the H-mode pedestal V_T^ped shifted continuously in the counter-direction when perpendicular NBs were applied. At fixed values of V_T^ped , fELM increased clearly in proportion to Psep. In addition, this proportionality between fELM and Psep holds regardless of the mixture of datasets of the toroidal momentum inputs. The proportional coefficient decreased as V_T^ped shifted in the co-direction.

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

2012-10-01

123

Photobacterium sp. JT-ISH-224 produces two sialyltransferases, alpha-/beta-galactoside alpha2,3-sialyltransferase and beta-galactoside alpha2,6-sialyltransferase.  

PubMed

A novel bacterium, Photobacterium sp. JT-ISH-224, that produces alpha-/beta-galactoside alpha2,3-sialyltransferase and beta-galactoside alpha2,6-sialyltransferase, was isolated from the gut of a Japanese barracuda. The genes that encode the enzymes were cloned from the genomic library of the bacterium using the genes encoding alpha-/beta-galactoside alpha2,3-sialyltransferase from P. phosphoreum and beta-galactoside alpha2,6-sialyltransferase from P. damselae as probes. The nucleotide sequences were determined, and open reading frames of 1,230 and 1,545 bp for encoding an alpha2,3-sialyltransferase and an alpha2,6-sialyltransferase of 409- and 514-amino acid residues, respectively, were identified. The alpha2,3-sialyltransferase had 92% amino acid sequence identity with the P. phosphoreum alpha2,3-sialyltransferase, whereas the alpha2,6-sialyltransferase had 54% amino acid sequence identity with the P. damselae alpha2,6-sialyltransferase. For both enzymes, the DNA fragments that encoded the full-length protein and its truncated form lacking the putative signal peptide sequence were amplified by a polymerase chain reaction and cloned into an expression vector. Each gene was expressed in Escherichia coli, and the lysate from each strain had enzymatic activity. The alpha2,3-sialyltransferase catalysed the transfer of N-acetylneuraminic acid (NeuAc) from CMP-NeuAc to lactose, alpha-methyl-galactopyranoside and beta-methyl-galactopyranoside with low apparent K(m) and the alpha2,6-sialyltransferase catalysed the transfer of NeuAc from CMP-NeuAc to lactose with low apparent K(m). PMID:17984122

Tsukamoto, Hiroshi; Takakura, Yoshimitsu; Mine, Toshiki; Yamamoto, Takeshi

2007-11-04

124

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

SciTech Connect

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 D{alpha} 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 ({approx}1.4 km/s for least-mean-squared fitting).

Suzuki, T.; Oyama, N.; Asakura, N. [Japan Atomic Energy Agency, 801-1, Mukoyama, Naka, Ibaraki 311-0193 (Japan)

2010-04-15

125

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

SciTech Connect

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

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

1980-09-01

126

Program on Ground Test of Modified Quiet, Clean, Jt3d and Jt8d Turbofan Engines in Their Respective Nacelles.  

National Technical Information Service (NTIS)

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 reduc...

1973-01-01

127

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

128

Development of a Low Noise 10K J-T Refrigeration System.  

National Technical Information Service (NTIS)

This report summarizes work done on the development of a low noise, Joule-Thomson, microminiature refrigeration system. Progress has been made on the development of the pneumatic compressor drive system which will be used to operate the compressor to dete...

W. A. Little

1990-01-01

129

Studies on Structural Analysis Related to the Design of the JT-60 Vacuum Vessel.  

National Technical Information Service (NTIS)

Studies on structural analysis of a vacuum vessel of tokamak-type fusion devices are presented. The present studies are proposals for the structural analysis procedures of the tokamak-type fusion devices and are composed of five parts, each of which cover...

H. Takatsu

1987-01-01

130

Energy confinement of hydrogen and deuterium H-mode plasmas in JT-60U  

NASA Astrophysics Data System (ADS)

Energy confinement properties for hydrogen and deuterium H-mode plasmas are investigated. The thermal energy confinement time becomes longer in deuterium by a factor of ˜1.4 than in hydrogen at a given absorbed power. When the absorbed power is fixed, the values of electron temperature Te and ion temperature Ti become explicitly higher in deuterium than in hydrogen across the whole range of minor radius while the profiles of electron density ne are almost the same. Accordingly, the effective heat diffusivity becomes relatively lower in deuterium than in hydrogen. Despite almost the same power crossing the separatrix, type-I ELM frequency for hydrogen becomes approximately double that of deuterium. When the stored energy is fixed, the spatial profiles of ne, Te and Ti become identical for both cases while higher heating power is required in the hydrogen case. The pedestal pressure is about twice as high in deuterium as that in hydrogen at a given absorbed power. The increase of the pedestal temperature is more significant for the deuterium case while the pedestal density is not changed. The poloidal beta at the H-mode pedestal \\beta_p^ped is increased linearly with the increased total poloidal beta \\beta_p^TOT for both cases. The relation between \\beta_p^TOT and \\beta_p^ped is almost identical regardless of the difference of the isotope species.

Urano, H.; Takizuka, T.; Fujita, T.; Kamada, Y.; Nakano, T.; Oyama, N.; the JT-60 Team

2012-11-01

131

Development of advanced operation scenarios in weak magnetic-shear regime on JT-60U  

NASA Astrophysics Data System (ADS)

Fully non-inductive discharge having a relaxed current profile and a high bootstrap current fraction fBS = 0.5 has been realized in the high-?p ELMy H-mode discharge with weak magnetic-shear having q95 = 5.8, qmin = 2.1 and q(0) = 2.4, where qmin and q(0) are the safety factor q at the minimum and the plasma centre, respectively. The rest of the plasma current is externally driven by neutral beams and lower-hybrid waves. The safety factor profile evaluated by the motional Stark effect diagnostic is kept unchanged for 0.7 s at the end of the full current drive (CD) sustainment for 2 s (1.5 times the current relaxation time ?R). The loop voltage profile is spatially uniform at 0 V at the end of the sustainment. This demonstration shows, for the first time, that the steady sustainment of full-CD plasma is possible at high fBS = 0.5 and reasonably low q95 = 5.8 regime and is stably controlled by appropriate external current drivers. On the other hand, when the combination of bootstrap current and externally driven current does not match the steady current profile, a slight change in the current profile due to current relaxation resulted in the appearance of magnetohydrodynamic instability, e.g. neo-classical tearing mode, in a high-beta plasma. This discharge clarifies the importance of the demonstration of steady current profile developed here. These discharges contribute to the ITER steady-state operation scenario development.

Suzuki, T.; Oyama, N.; Isayama, A.; Sakamoto, Y.; Fujita, T.; Ide, S.; Kamada, Y.; Naito, O.; Sueoka, M.; Moriyama, S.; Hanada, M.; JT-60 Team

2009-08-01

132

Development of a valved linear compressor for a satellite borne J–T cryocooler  

Microsoft Academic Search

The provision of temperatures below 12K is essential for sub-mm and FIR observations from satellite instruments. Historically this has been achieved with stored cryogens, however mechanical coolers could potentially provide higher reliability and flexibility. These cryocoolers typically incorporate a regenerative cold-finger, such as a pulse-tube, however this can be replaced by a recuperative Joule–Thompson stage to obtain the lowest temperatures

Jaime Reed; Mike Dadd; Paul Bailey; Michael Petach; Jeff Raab

2005-01-01

133

Development of a Low Noise 10 K J-T (Joule-Thomson) Refrigeration System.  

National Technical Information Service (NTIS)

This report summarizes work done on the development of a low noise Joule-Thomson, microminiature refrigeration system designed for 10 K operation. Topics discussed include: calculation of phase diagram of mixtures of certain hydrocarbon gases with nitroge...

W. A. Little

1987-01-01

134

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

SciTech Connect

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

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

2010-04-09

135

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

NASA Astrophysics Data System (ADS)

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

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

2010-04-01

136

76 FR 8620 - Airworthiness Directives; Pratt & Whitney JT8D-209, -217, -217A, -217C, and -219 Turbofan Engines  

Federal Register 2010, 2011, 2012, 2013

...Request One commenter, American Airlines, requested that we change the...give PW the time to revise fan hub inspection Alert Service Bulletin...Method of Compliance to fan hub inspection AD 97-17-04R1...Hub (Disk), 1st Stage...

2011-02-15

137

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

138

Development of a low noise 10K J-T refrigeration system. Technical progress report, 31 Aug-15 Oct 90  

SciTech Connect

This report summarizes work done on the development of a low noise, Joule-Thomson, microminiature refrigeration system. Progress has been made on the development of the pneumatic compressor drive system which will be used to operate the compressor to determine the compressor lifetime and refrigerator system performance. Work on the refrigerator itself also has progressed well with operation down to 20K now being achieved, and reliably reproduced. Work is underway on the heat exchanger section of the third stage of the refrigerator, the helium stage.

Little, W.A.

1990-10-15

139

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

Microsoft Academic Search

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

1987-01-01

140

Interaction of lower hybrid wave with fast ions injected by neutral beam on the JT-60 tokamak  

SciTech Connect

The acceleration of beam ions due to their interaction with lower hybrid (LH) waves is investigated. The critical coupling density, above which the LH power is absorbed mostly by ions rather than electrons, is found to depend strongly on the LH frequency but not on the refractive index parallel to the toroidal magnetic field. These dependences are in good agreement with the predictions of a simple, clear theory based on a dispersion relation in the electrostatic cold-plasma approximation.

Nemoto, M.; Ushigusa, K.; Imai, T.; Ikeda, Y.; Naito, O.; Kusama, Y.; Tobita, K.; Takeuchi, H. (Japan Atomic Energy Research Institute, Naka Fusion Research Establishment, Naka-machi, Naka-gun, Ibaraki-ken 311-01, Japan (JP)); JT-60 Team

1991-07-01

141

Display Monitor Measurement Methods under Discussion by EIA (Electronic Industries Association) Committee JT-20, Part 1: Monochrome CRT Monitor Performance, Version 2.0.  

National Technical Information Service (NTIS)

The goal of this document is to provide practical, tested procedures for obtaining and reporting consistent and repeatable performance measurements of monochrome CRT displays, especially those used in gray scale imagery analysis. The reported results of t...

1995-01-01

142

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

Federal Register 2010, 2011, 2012, 2013

...9A, -11, -15, -17, and -17R Turbofan Engines AGENCY: Federal Aviation Administration...9A, -11, -15, -17, and -17R turbofan engines. This AD requires overhauling...9A, -11, - 15, -17, and -17R turbofan engines. We published the proposed...

2010-10-08

143

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

Federal Register 2010, 2011, 2012, 2013

...17, and -17R turbofan engines. This proposed AD would require...Gray, Aerospace Engineer, Engine Certification Office, FAA, Engine & Propeller Directorate...this proposed AD. Using the search function of the Web...

2010-05-19

144

Destabilization of ellipticity-induced Alfvén eigenmodes during ICRF heating and stabilization by negative-ion-based neutral beam injection in JT-60U  

NASA Astrophysics Data System (ADS)

High-frequency modes in the 525-550 kHz range with toroidal mode numbers n = 3-7 were excited after the sawtooth crash during ion cyclotron range of frequency (ICRF) heating. Based on the stability analysis using the NOVA-K code, these modes were found to be consistent with ellipticity-induced Alfvén eigenmodes (EAEs) excited in the EAE gap located at the q = 1 surface. A change in the safety factor after the sawtooth crash was essential for the excitation of EAEs in the core region of the plasma. The high-frequency modes were stabilized by the neutral beam injection at 350 keV using negative-ion-based neutral beam (NNB) injectors. Stability analysis using the NOVA-K code has shown that NNB-injected ions enhance the damping of the EAEs and tend to stabilize them.

Kusama, Y.; Fu, G. Y.; Kramer, G. J.; Saigusa, M.; Oikawa, T.; Ozeki, T.; Moriyama, S.; Tchernychev, F. V.; Nemoto, M.; Kondoh, T.; Hatae, T.; Tobita, K.; Kuriyama, M.; Cheng, C. Z.; Kimura, H.

1999-09-01

145

Molecular characterization of jumping translocations reveals spatial and temporal breakpoint heterogeneity  

Microsoft Academic Search

Jumping translocations (JT) are characterized by the relocalization of the same part of a donor to several recipient chromosomes. Although JT occasionally are constitutional, most are associated with hematologic malignancies. In such cases, JT usually arise during disease progression and are associated with poor prognosis. Despite its clinical importance, this cytogenetic phenomenon has not been characterized at the molecular level.

P Andreasson; M Höglund; T Jonson; A Békàssy; F Mitelman; B Johansson

1998-01-01

146

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

Microsoft Academic Search

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

Marc Rehfuss; James Urban

2005-01-01

147

Comment on 'Observations of reconnection of interplanetary and lobe magnetic field lines at the high-latitude magnetopause' by J.T. Gosling, M.F. Thomsen, S.J. Bame, R.C. Elphic, and C.T. Russell  

NASA Astrophysics Data System (ADS)

Comment is presented on the results of measurements, reported by Gosling et al. (1991), that were made on ISEE in the vicinity of the high-latitude dusk magnetopause near the terminator plane, at a time when the local magnetosheath and tail lobe magnetic fields were nearly oppositely directed. The character of the observed plasma flowing both tailward and sunward within the high-latitude magnetopause current layer presented real evidence for the local reconnection process. Gosling et al. argued that this process may be a manifestation of different global magnetospheric topology structures. In the comment, a global magnetospheric convection pattern is constructed for the northward IMF and for the case of a large azimuthal component of the IMF with small Bz, irrespective of its sign. The suggested scheme provides a simple explanation for the observed sunward convection in the polar caps both for the northward and for strong By with small Bz. According to the present model, for the magnetosheath field at 2300 UT on June 11, 1978, the reconnection between the open field lines appears at the northern neutral point.

Belen'kaia, Elena

1993-04-01

148

Procainamide for Rate Control of Postsurgical Junctional Tachycardia  

Microsoft Academic Search

.   This study was conducted to determine the efficacy of procainamide therapy for rapid rate control of postoperative junctional\\u000a tachycardia (JT). Postoperative JT is one of the most difficult forms of tachycardia to manage. Reported success with a variety\\u000a of treatments of JT in infants and children has been inconsistent and limited. Rate control using procainamide was achieved\\u000a in 17

R. Mandapati; C. J. Byrum; R. E. W. Kavey; F. C. Smith; D. A. Kveselis; W. P. Hannan; B. Brandt III; W. E. Gaum

2000-01-01

149

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.

2010-01-01

150

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; Wisløff, Ulrik; Castagna, Carlo

2008-05-01

151

Dispersion of QT Interval following Ventricular Premature Beats and Mortality after Myocardial Infarction  

Microsoft Academic Search

In a group of 193 postinfarction patients with ventricular premature beats on a resting 12-lead ECG, the dispersion of QT and JT intervals was calculated as a difference between maximum and minimum QT and JT intervals in ventricular premature beats. During a follow-up of 38 ± 17 months, death from all causes was noted in 56 patients. Univariate predictors of

Andrzej Dabrowski; Ryszard Piotrowicz

1999-01-01

152

Turbine Engine Particulate Emission Characterization.  

National Technical Information Service (NTIS)

Particulate emissions from the TF-30, JT8D, and JT9D aircraft turbine engines were characterized for mass emission rate, particle size distribution, particle shape, and elemental composition as a function of engine type, fuel type, and power setting. Samp...

D. L. Fenton E. H. Luebcke J. D. Stockham P. B. Campbell R. H. Johnson

1979-01-01

153

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

Microsoft Academic Search

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

Vickie Coleman Gallagher; Kenneth J. Harris; Matthew Valle

2008-01-01

154

40 CFR 87.1 - Definitions.  

Code of Federal Regulations, 2012 CFR

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

2012-07-01

155

US EPA, Pesticide Product Label, FORMULA 190-A NON ...  

EPA Pesticide Factsheets

... C' ,. -tt tOI (l ~'. ,!on'jt.,d fJt" _,j v'. '-: jIRf:( IICt'-lS f-OR USt " , ~). ... r " 't! r'll por q 1,1''( d ", (o! () r p d Z 0 r '> i (l D ') n') IV \\ ecr 5! /\\, yi"': II'~ bi·"'gta\\'. ...

2011-04-14

156

A Nonparametric Test for the Ordered Alternative Based on Kendall's Correlation Coefficient  

Microsoft Academic Search

Several methods have been developed for testing the ordered alternative. These include the Jonckheere–Terpstra (JT) test (Jonckheere, 1954; Terpstra, 1952), a modified JT test (MJT) (Tryon and Hettmansperger, 1987), and a test proposed by Terpstra and Magel (TM) (Terpstra and Magel, 2003), among others. This article proposes a new method for testing the ordered alternative. The proposed test is based

Ridha Ferdhiana; Jeff Terpstra; Rhonda C. Magel

2008-01-01

157

100KV, 80A, 10S Power Supply for a Neutral Beam Injector Using a Series of Gate Turn off Thyristors as a Regulator/Switch Valve.  

National Technical Information Service (NTIS)

A voltage regulated GTO valve was devised and applied in the accel power supply of the prototype injector unit for JT-60 with the particular intent to check its applicability to the JT-60 NBI power supplies. High reliability and applicability were confirm...

M. Matsuoka M. Kawai M. Komata S. Kitamura S. Matsuda

1984-01-01

158

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

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

2013-01-23

159

Monte Carlo calculations of the intrinsic detector backgrounds for the Karlsruhe Tritium Neutrino Experiment  

NASA Astrophysics Data System (ADS)

The Karlsruhe Tritium Neutrino Experiment (KATRIN) aims to measure the absolute neutrino mass, an open question in neutrino physics. KATRIN exploits the fact that the beta-decay spectral shape near the endpoint depends on the neutrino mass. Using a gaseous tritium source and a precise electrostatic spectrometer, KATRIN will measure the integral beta-decay spectrum in a silicon detector. KATRIN strives for a sensitivity of 0.2 eV (90% CL) to the neutrino mass, ten times better than the current limit. A measurement at this level of sensitivity has broad implications for cosmology and particle physics. To maximize sensitivity to the small beta-decay signal, the KATRIN silicon detector must have minimal intrinsic backgrounds. The background goal for the detector is less than 10-3 counts per second (1 mHz) in the region of interest near the 18.6 keV signal. In this dissertation, we present estimates of the detector background rate calculated with a custom Geant4-based Monte Carlo simulation. The simulation includes a detailed description of the detector system and attributes of the intrinsic background sources, natural radioactivity and cosmic rays. We identified the largest background sources, optimized the detector region design to minimize the background rate, and performed measurements to confirm the simulation results. In particular, we have measured the radiation field from radioactivity in all objects in the detector laboratory using a germanium detector. The simulated germanium detector rate agrees within 5% of the measured rate. In addition, various calibration spectra measured with silicon and germanium detectors are within 7% of the simulated spectra. The results from our simulations indicate that we should observe a background of [2.54 +/- 0.11(stat.) +0.36-0.35 (sys.)]mHz at the nominal magnetic field of 3 T and zero post acceleration. The largest background sources are radiation from the laboratory environment and cosmic-ray photons. Utilizing 20 kV of post-acceleration and the same magnetic field of 3 T, we should reduce the background rate to [1.01 +/- 0.07(stat.) +0.13-0.14 (sys.)]mHz. A higher magnetic field may reduce the background rate further. These background studies indicate that the detector background rate is within the target limit and will not diminish KATRIN's expected neutrino-mass sensitivity.

Leber, Michelle L.

160

Cobalt suppressed Jahn–Teller effect in LiCo 0.5 Ni 0.5 O 2 for lithium ion batteries  

Microsoft Academic Search

The structural and electronic properties of LiCo0.5Ni0.5O2 are studied from first principles calculations. Results show that Ni3+ ions in LiNiO2 have the (t2g)6(dz2)1 electronic configuration, which gives rise to obvious Jahn–Teller (JT) distortion to the NiO6 octahedral in the lattice. In LiCo0.5Ni0.5O2 however, Ni ions exhibit a (t2g)6(eg)2 electronic configuration that is no longer JT active. Co ions suppress JT

J. M. Wang; J. P. Hu; C. Y. Ouyang; S. Q. Shi; M. S. Lei

2011-01-01

161

Topological properties of random crack networks  

Microsoft Academic Search

The junctions of cracks in mudcrack, patterned ground, and columnar joint patterns can be categorized into “Y,” “T,”and “X”types. The mean number of sides,\\u000a$$\\\\tilde g$$\\u000a,to the polygonal areas in such nets is\\u000a$$\\\\tilde \\\\bar g$$\\u000a = 2(2JT + 3JY + 4JX)\\/(JT + JY + 2JX)where JT, JY,and JXare the proportions of T, Y,and Xjunctions, respectively.

N. H. Gray; J. B. Anderson; J. D. Devine; J. M. Kwasnik

1976-01-01

162

Measuring mass of neutrinos with beta-decays of tritium and rhenium  

Microsoft Academic Search

Already long time ago the shape of the electron spectrum in beta-decays of 3H and 187Re has been recognized as an important tool for understanding of neutrino masses. The sensitivity of KATRIN (in preparation, tritium beta-decay) and the MARE (under consideration, 187Re beta-decay) experiments to neutrino mass will reach the sub eV domain. In view of this experimental progress there

R. Dvornický; F. Simkovic

2009-01-01

163

TRAP—a cryopump for pumping tritium on pre-condensed argon  

Microsoft Academic Search

The TRitium Argon frost Pump experiment (TRAP) 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 ?4.2K. This article covers the technical setup of the TRAP experiment and presents first

O. Kazachenko; B. Bornschein; L. Bornschein; F. Eichelhardt; N. Kernert; H. Neumann

2008-01-01

164

Junction temperature measurement of light emitting diode by electroluminescence.  

PubMed

Junction temperature (JT) is a key parameter of the performance and lifetime of light emitting diodes (LEDs). In this paper, a mobile instrument system has been developed for the non-contact measurement of JTs of LED under LabVIEW control. The electroluminescence (EL) peak shift of the LED is explored to measure the JT. Commercially available high power blue LEDs are measured. A linear relation between emission peak shift and JT is found. The accuracy of the JT is about 1 °C determined by the precision of the emission peak shift, ±0.03 nm, at 3? standard deviation for blue LED. Using this system, on-line temperature rise curves of LED lamps are determined. PMID:22225193

He, S M; Luo, X D; Zhang, B; Fu, L; Cheng, L W; Wang, J B; Lu, W

2011-12-01

165

(b) (6)  

Center for Biologics Evaluation and Research (CBER)

Text Version... 9 Page 10. October 2010 28. Rivera GK, Pui CH, Hancock ML, Santana VM, Sandlund JT, Hurwitz C, Ribeiro R, Furman W, Crist WM. Update of St. ... More results from www.fda.gov/downloads/advisorycommittees/committeesmeetingmaterials

166

Theodore Fang Tsai Curriculum Vitae  

Center for Biologics Evaluation and Research (CBER)

Text Version... 59. Roehrig JT, Hunt AR, Chang GJ, Sheik B, Bolin RA, Tsai TF, Trent DW: Identification of monoclonal antibodies capable of ... 202. King James C., Jr ... More results from www.fda.gov/downloads/advisorycommittees/committeesmeetingmaterials

167

Faculty Handbook and Administration Manual: Divine Word College, A College of Liberal Arts.  

ERIC Educational Resources Information Center

|This faculty handbook and administration manual contains duties and responsibilities of both faculty and administration including information on academic programs, standards and policies, and information on student financial aid and services. (JT)|

Divine Word Coll., Epworth, IA.

168

Annual report of the Naka Fusion Research Establishment for the period of April 1 1989 to March 31 1990.  

National Technical Information Service (NTIS)

Research and development activities of the Naka Fusion Research Establishment for the period of April 1989 to March 1990 are reported. The experiment on JT-60 was continued to October 1989. In the pellet injection experiment, plasma energy confinement was...

1990-01-01

169

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

ERIC Educational Resources Information Center

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

Moran, Robert D.

1974-01-01

170

Jobs with Service Programs: Home Services  

ERIC Educational Resources Information Center

|A review of the kinds of jobs available in services developed to help the homebound elderly: Home health care, homemaker-home health aide, chore service, home repair and maintenance, home-delivered meals, telephone reassurance, and friendly visiting. (JT)|

Kahl, Anne

1976-01-01

171

The Many Faces of Consumerism  

ERIC Educational Resources Information Center

|This analysis of differing conceptions of student consumerism, pointing to possible reforms and to still unresolved problems, includes an annotated bibliography of sources of information on the subject labeled "general reference" and "for the serious reader." (Editor/JT)|

Stark, Joan S.

1976-01-01

172

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

ERIC Educational Resources Information Center

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

Short, John

1974-01-01

173

Sharing Teaching Ideas  

ERIC Educational Resources Information Center

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

Mathematics Teacher, 1977

1977-01-01

174

Towards a Portable Marxist Criticism: A Critique and Suggestion.  

ERIC Educational Resources Information Center

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

Pfeil, Fred

1980-01-01

175

US EPA, Pesticide Product Label, KANDU BLEACH, 02/03 ...  

EPA Pesticide Factsheets

... I ' '! .? l 'I" ? I~ } ,-j " - n : .. ;cllJ!;, ", til". c.'' 1 --:':0 . . - / ' j :1' !~Jt.. .. ~ lifi '/,'I)t, AOT i , ? ; ~~ I~ , Rinse In potable water. PlrJI( CLt/\\NER SANITIZE-~ ? ...

2011-04-21

176

Teasing Hamsters in Electric Cages?  

ERIC Educational Resources Information Center

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

Page, Colin Flood

1975-01-01

177

Toshiba Review, International Edition, Number 141, September-October 1982.  

National Technical Information Service (NTIS)

Contents: Recently developed vacuum interrupter construction and performance improvement; New series of vacuum circuit-breakers and vacuum contactors; Recent trend in metal-clad switchgear; Particle and x-ray measurements in JT-60 diagnostics; New currenc...

1982-01-01

178

End-To-End Interim Report, Phase 4.  

National Technical Information Service (NTIS)

The Joint Advanced Distributed Simulation (JADS) Joint Test and Evaluation (JT&E) was chartered by the Deputy Director, Test Systems Engineering, and Evaluation (Test and Evaluation), Office of the Under Secretary of Defense (Acquisition and Technology) i...

P. M. Hovey G. J. Marchand

1999-01-01

179

Hydrothermal liquefaction of corn straw under CO atmosphere: Effect of catalysts  

Microsoft Academic Search

the effects of different catalysts (homogeneous catalysts: NaOH, Na2CO3, KOH and K2CO3; heterogeneous catalysts: JB-1, JT-201 and JT-203) on the hydrothermal liquefaction of biomass under CO atmosphere were investigated mainly using a high- pressure autoclave reactor at 380?` . The results indicated that the conversion of biomass and the yield of liquid products increased obviously with the adding of the

Chaowen Wu; Wencai Peng; Shiyong Wu; Youqing Wu; Jinsheng Gao

2011-01-01

180

ANG II reduces net acid secretion in rat outer medullary collecting duct.  

PubMed

In rat outer medullary collecting duct (OMCD), the mechanism(s) and regulation of H+ secretion are not understood fully. The effect of changes in acid-base balance and the renin-angiotensin system on net H+ secretion was explored. Rats received NaCl, NaHCO3, NH4Cl, or nothing in their drinking water for 7 days. Total ammonia and total CO2 (JtCO2) fluxes were measured in OMCD tubules perfused in vitro from rats in each treatment group. JtCO2 was reduced in tubules from rats drinking NH4Cl relative to those drinking NaHCO3. Because NH4Cl intake increases plasma renin and aldosterone, we asked if upregulation of the renin-angiotensin system reduces net H+ secretion. Deoxycorticosterone pivalate administered in vivo did not affect JtCO2. However, ANG II given in vivo at 0.1 ng/min reduced JtCO2 by 35%. To determine if ANG II has a direct effect on acid secretion, JtCO2 was measured with ANG II applied in vitro. ANG II (10-8 M) present in the bath solution reduced JtCO2 by 35%. This ANG II effect was not observed in the presence of the AT1 receptor blocker candesartan. In conclusion, in rat OMCD, JtCO2 is paradoxically reduced with NH4Cl ingestion. Increased circulating ANG II, as occurs during metabolic acidosis, reduces JtCO2. PMID:12851254

Wall, Susan M; Fischer, Michael P; Glapion, Dawn M; De La Calzada, Mae

2003-07-08

181

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

Microsoft Academic Search

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

Yoshihisa Sato

2004-01-01

182

Local Structure of La1-xSrxCoO3 determined from EXAFS and neutron PDF studies  

SciTech Connect

The combined local structure techniques, extended x-ray absorption fine structure (EXAFS) and neutron pair distribution function analysis, have been used for temperatures 4<= T<= 330 K to rule out a large Jahn-Teller (JT) distortion of the Co-O bond in La1?xSrxCoO3 for a significant fraction of Co sites (x<= 0.35), indicating few, if any, JT-active, singly occupied eg Co sites exist.

Sundaram, N.; Jiang, Y.; Anderson, I. E.; Belanger, D. P.; Booth, C. H.; Bridges, F.; Mitchell, J. F.; Proffen, Th.; Zheng, H.

2009-01-26

183

A GPS\\/Galileo SoC with adaptive in-band blocker cancellation in 65nm CMOS  

Microsoft Academic Search

1, , , where s(t), n(t), and j(t) represent the signal, noise, and in-band blocker respectively. In general, the in-band blocker j(t) consists of multiple narrow-band CW tones. The thermal noise n(t) is AWGN with zero mean. The GPS signal s(t) is coded and its power spectral density is smaller than the noise n(t). Since s(t) and n(t) are with

Chia-Hsin Wu; Wen-Chieh Tsai; Chun-Geik Tan; Chun-Nan Chen; Kuan-I Li; Jui-Lin Hsu; Chi-Lun Lo; Hsin-Hua Chen; Sheng-Yuan Su; Kun-Tso Chen; Min Chen; Osama Shana'a; Shu-Hung Chou; George Chien

2011-01-01

184

Electrocardiographic repolarization abnormalities in familial dysautonomia: an indicator of cardiac autonomic dysfunction  

Microsoft Academic Search

Objective: Electrocardiographic repolarization intervals were evaluated to determine the extent of cardiac autonomic dysfunction in patients with familial dysautonomia (FD) and to determine if any of these intervals could serve as a possible predicotr of clinical symptoms.Methods: Thirty-seven electrocardiograms of patients with FD were retrospectively evaluated. QT, JT, rate-corrected QT and JT intervals were calculated as well as QT and

Julie S. Glickstein; Felicia B. Axelrod; Deborah Friedman

1999-01-01

185

To what extent does genealogical ancestry imply genetic ancestry?  

Microsoft Academic Search

Recent statistical and computational analyses have shown that a genealogical most recent common ancestor (MRCA) may have lived in the recent past [Chang, J.T., 1999. Recent common ancestors of all present-day individuals. Adv. Appl. Probab. 31, 1002–1026. 1027–1038; Rohde, D.L.T., Olson, S., Chang, J.T., 2004. Modelling the recent common ancestry of all living humans. Nature 431, 562–566]. However, coalescent-based approaches

Frederick A. Matsen; Steven N. Evans

2008-01-01

186

STUDY OF BEHAVIOR IN THE HEAT EXCHANGER OF A MIXED GAS JOULE-THOMSON COOLER  

Microsoft Academic Search

The object of the investigation is a mixed gas Joule-Thomson (J-T) cooler. A computa- tional model was developed, which makes it possible to investigate the steady state behavior of the refrigerant in the heat exchanger of a mixed gas J-T system. The calculations show that the temperature distribution as well as the pressure distribution in the heat exchanger channels depends

A. Alexeev; A. Thiel; Ch. Haberstroh; H. Quack

187

Magnetic fusion energy studies in Japan  

Microsoft Academic Search

The primary facility for magnetic fusion energy (MFE) research in Japan is JT-60, in which DD plasma is heated up to an electron temperature of Te>10keV with neutral beam injection (NBI) and radio frequency (RF) powers. It is noted that a normalized ?N of 2.3 was maintained for 22s. The JT-60 team has discovered internal transport barrier (ITB) in high-beta-poloidal

M. Ogawa; S. Tsuji-Iio; A. Komori; K. Kawahata; O. Kaneko; T. Inoue; Y. Kamada

2007-01-01

188

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

Microsoft Academic Search

As part of the NASA Flight Effects on Fan Noise Program, a Grumman OV-1B Mohawk aircraft was modified to carry a modified and instrumented Pratt & Whitney JT15D-1 turbofan engine. Onboard flight data, together with simultaneously measured farfield acoustic data, comprise a flight data base to which JT15D-1 static and wind-tunnel data are compared. The overall objective is to improve

R. A. Golub; J. S. Preisser

1984-01-01

189

Performance Investigations of a 4 to 10 K Long-Life Mechanical Cryocooler  

Microsoft Academic Search

We believe that the quickest way of obtaining a reliable space cooler in the range of 4 to 10 K is to combine a Stirling mechanical cooler with a Joule-Thomson (J-T) cooler. In this approach we perform the bulk of the cooling with the Stirling cooler and use the J-T cooler for the small amount of cooling required at the

W. J. Gully; D. Glaister; E. Marquardt

2004-01-01

190

Vibronic Analysis of the widetilde{A}^2 E^'' State of NO_3 Radical  

NASA Astrophysics Data System (ADS)

The nitrate radical is a key reactant in atmospheric chemistry leading to the formation of acid rain and is the primary oxidant in the night sky. The widetilde{A}^2 E^'' state of NO_3 is doubly degenerate and is therefore subject to Jahn-Teller (JT) coupling through the degenerate in-plane stretch and bend modes (?_3 and ?_4 respectively). We have taken a moderate resolution CRDS spectrum of the widetilde{A}^2 E^''-widetilde{X}^2 A_2' transition of the NO_3 radical under jet-cooled conditions. We resolve ˜20 vibronic transitions and are able to assign many using an independent anharmonic oscillator model as was presented previously. In order to gain a deeper understanding of the nature of the JT effect in this electronic state we have performed a vibronic analysis including linear and quadratic JT coupling terms for ?_3 and ?_4 and possible bilinear coupling between the totally symmetric stretch, ?_1, and ?_4. We conclude that the JT coupling in ?_4 is quite weak. Satisfactory spectral fits can be obtained assuming weak JT coupling for ?_3 also, though there is some evidence of strong JT coupling for ?_3 and the strengths and weaknesses of each case are discussed. Codd, T. et al. 67^{th} Int. Symp. Molec. Spec. (2012)}

Codd, Terrance J.; Roudjane, Mourad; Chen, Ming-Wei; Miller, Terry A.

2013-06-01

191

Roseovarius nanhaiticus sp. nov., a member of the Roseobacter clade isolated from marine sediment.  

PubMed

An aerobic, Gram-staining-negative, rod or ovoid-shaped bacterial isolate, strain NH52J(T), was isolated from a sandy sediment sample from the South China Sea. Strain NH52J(T) exhibited tumbling motility, formed beige or faint pink colonies, gave a positive reaction in tests for catalase and oxidase and required NaCl for growth. Optimal growth was observed at pH 7.8-9.3, at 30 degrees C and in the presence of 2.0-4.0 % (w/v) NaCl. The novel strain did not synthesize bacteriochlorophyll a, and the DNA G+C content was 62 %. The major fatty acids were C(18 : 1)omega7c, C(16 : 0) and C(18 : 1)omega7c 11-methyl. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain NH52J(T) was affiliated to the genus Roseovarius of the class Alphaproteobacteria. Roseovarius pacificus and Roseovarius aestuarii were the most closely related recognized species to strain NH52J(T) with 16S rRNA gene sequence similarity values of 95.0 and 95.7 %, respectively. Sequence similarity values between strain NH52J(T) and other phylogenetically related species were all below 95.0 %. Based on the phenotypic, chemotaxonomic and phylogenetic data presented, strain NH52J(T) is considered to represent a novel species of the genus Roseovarius, for which the name Roseovarius nanhaiticus sp. nov. is proposed. The type strain is NH52J(T) (=LMG 24840(T)=CCTCC AB 208317(T)=MCCC 1A03543(T)). PMID:19667376

Wang, Baojiang; Sun, Fengqin; Lai, Qiliang; Du, Yaping; Liu, Xiupian; Li, Guangyu; Luo, Jie; Shao, Zongze

2009-08-10

192

The Jahn-Teller effect in the lower electronic states of benzene cation. I. Calculation of linear parameters for the e2g modes  

NASA Astrophysics Data System (ADS)

Jahn-Teller (JT) coupling parameters can be simply derived from features of the potential energy surfaces of the JT active vibrational modes of a molecule subject to that effect. Potential energy curves representing cuts of D2h symmetry have been calculated using density functional theory for each of the four active e2g modes of benzene cation in each of the lowest three degenerate electronic states. From these curves and the vibrational frequencies, the JT coupling parameters can be found (vibrational numbering follows Wilson's notation, coupling parameters are in Moffit's notation). For the C6H6+X~ 2E1g state the largest JT coupling parameter is provided by mode 6 (D=0.48), followed closely by mode 8 (0.30) and then mode 9 (0.10). Mode 7 provides almost no stabilization. For the B~ 2E2g state, calculated coupling parameters are very large, particularly for modes 8 (1.36) and 6 (0.93). Modes 7 (0.10) and 9 (0.07) are smaller but finite. For the D~ 2E1u state, mode 6 has an impressive linear coupling parameter of 4.12, able to support several vibrations below the JT cusp. Indications of a substantial quadratic stabilization for that mode result in the possibility of a completely static distortion in that state. Similar, but not identical, results are obtained for C6D6+.

Johnson, Philip M.

2002-12-01

193

Natural Orbital Analysis of Ultrafast Multielectron Dynamics of Molecules  

NASA Astrophysics Data System (ADS)

The ionization dynamics of molecules in intense laser fields is investigated by using a time-dependent multiconfiguration theory for propagating the many-electron wave function in a grid space. We use the natural orbitals obtained from the many-electron wave function, i.e., the molecular orbitals obtained by diagonalizing the one-particle electron density matrix, to analyze the ionization process. We eliminate the ionizing portions of orbitals reaching the grid boundaries set far away from the nuclei; the occupation numbers of natural orbitals decrease due to ionization. The ionization probabilities of individual natural orbitals can be obtained from the accumulated reductions in occupation numbers. We also propose a new definition of molecular orbital energy in order to investigate the energetics of natural orbitals. It is shown that when energies are assigned to natural orbitals {{? }j(t)} as chemical potentials {bar{{? }}j(t)}, one can quantify a correction to the total electronic energy that represents electron correlation; that is, time-dependent correlation energy is introduced. Our attempt is illustrated by numerical results on the time-dependence of the spatial density and chemical potential for a H2 molecule interacting with an intense, near-infrared laser field. We compared the energy ? j (t) supplied by the applied field with the net energy gain ? bar{{? }}j(t) in the chemical potential for ? j (t) and found that energy accepting orbitals of ? bar{{? }}j(t) > {? }j(t) exhibit high ionization efficiency.

Kono, Hirohiko; Oyamada, Takayuki; Kato, Tsuyoshi; Koseki, Shiro

194

Recurrent Hyperparathyroidism and a Novel Nonsense Mutation in a Patient with Hyperparathyriodism-Jaw Tumor Syndrome.  

PubMed

Objective: To present the case of a hyperparathyroidism-jaw tumor (HPT-JT) patient with a novel nonsense mutation of the CDC73 gene.Methods: We present the case of a patient with a history of three prior maxillectomies and two prior parathyroidectomies who presented with recurrent primary hyperparathyroidism (PHPT). We also briefly review the literature pertaining to HPT-JT.Results: Genetic analysis revealed a novel nonsense mutation (c.85G>T; pGlu29*) in exon 1 of CDC73. The patient's son underwent genetic testing for a CDC73 mutation and was found to be negative.Conclusion: HPT-JT is a rare condition characterized by PHPT and benign tumors of the mandible and maxilla. Up to 15% of HPT-JT patients with PHPT have parathyroid carcinoma. HPT-JT is associated with an inactivating mutation of CDC73, a gene that codes for the tumor suppressor protein parafibromin. This report expands our understanding of the genetics underlying this rare disorder and emphasizes the importance of early detection in order to prevent hypercalcemic complications such as parathyroid carcinoma. PMID:23757631

Abdulla, Amer G; O'Leary, Erin M; Isorena, Jennifer P; Diaz, Miguel Fernando Palma; Yeh, Michael W

2013-06-11

195

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

196

Jahn-Teller Transitions in the Bimetallic Oxalates  

SciTech Connect

Bimetallic oxalates are a class of layered molecule-based magnets with transition-metal ions M(II) and M'(III) coupled by oxalate molecules (C2O4)-2 in an open honeycomb structure. Magnetic compensation (MC) has been observed in ferrimagnetic Fe(II)Fe(III) compounds with certain cations between the bimetallic layers. This behavior can be explained [1] by considering the C3-symmetric crystal field produced by the six oxygen atoms surrounding each Fe ion, which splits the L = 2, 3d6 multiplet on the Fe(II) sites into two doublets and one singlet. MC occurs when the doublet lies lowest in energy and carries an orbital angular momentum Lz between about 0.25 and 1.0. Because the low-energy doublet is half-filled, a Jahn-Teller (JT) distortion may break the C3 symmetry near the ferrimagnetic transition temperature. In the absence of spin-orbit coupling on the Fe(II) sites, the JT distortion would always occur at T = 0. However, due to the competition between the spin-orbit coupling and JT energies, the JT distortion disappears at low temperatures in compounds that display MC [2]. Comparison is made with recent experiments and predictions are made for controlling the MC and JT critical temperatures.

Fishman, Randy Scott [ORNL

2011-01-01

197

Pressure drop characteristics of cryogenic mixed refrigerant at macro and micro channel heat exchangers  

NASA Astrophysics Data System (ADS)

Mixed Refrigerant-Joule Thomson (MR-JT) refrigerators are widely used in various kinds of cryogenic systems these days. The temperature glide effect is one of the major features of using mixed refrigerants since a recuperative heat exchanger in a MR-JT refrigerator is utilized for mostly two-phase flow. Although a pressure drop estimation for a multi-phase and multi-component fluid in the cryogenic temperature range is necessarily required in MR-JT refrigerator heat exchanger designs, it has been rarely discussed so far. In this paper, macro heat exchangers and micro heat exchangers are compared in order to investigate the pressure drop characteristics in the experimental MR-JT refrigerator operation. The tube in tube heat exchanger (TTHE) is a well-known macro-channel heat exchanger in MR-JT refrigeration. Printed Circuit Heat Exchangers (PCHEs) have been developed as a compact heat exchanger with micro size channels. Several two-phase pressure drop correlations are examined to discuss the experimental pressure measurement results. The result of this paper shows that cryogenic mixed refrigerant pressure drop can be estimated with conventional two-phase pressure drop correlations if an appropriate flow pattern is identified.

Baek, Seungwhan; Jeong, Sangkwon; Hwang, Gyuwan

2012-12-01

198

Oral BG-12 (dimethyl fumarate) for relapsing-remitting multiple sclerosis: a review of DEFINE and CONFIRM Evaluation of: Gold R, Kappos L, Arnold D, et al. Placebo-controlled phase 3 study of oral BG-12 for relapsing multiple sclerosis. N Engl J Med 2012;367:1098-107; and Fox RJ, Miller DH, Phillips JT, et al. Placebo-controlled phase 3 study of oral BG-12 or glatiramer in multiple sclerosis. N Engl J Med 2012;367:1087-97.  

PubMed

Introduction: Multiple sclerosis (MS) is an autoimmune neurodegenerative disease of the central nervous system involving inflammation, chronic demyelination and axonal loss. MS affects more than 2 million people worldwide. Areas covered: This article aims to summarize the findings from two pivotal 2-year, randomized, double-blind, placebo-controlled, Phase III studies of BG-12 (dimethyl fumarate) for relapsing-remitting MS (RRMS): DEFINE (Determination of the Efficacy and Safety of Oral Fumarate in RRMS) and CONFIRM (Comparator and an Oral Fumarate in RRMS). Results from both studies demonstrated that BG-12 provides clinical and radiological efficacy over 2 years across a range of outcomes. These results were apparent as early as 12 weeks and sustained over the course of both studies. BG-12 was found to have an acceptable safety profile, with a similar overall incidence of adverse events across all treatment groups. Expert opinion: The combination of robust efficacy, ease of administration and established safety profile is unique to a new therapy in MS. Findings from the pivotal Phase III studies support BG-12 as a potential initial oral treatment for patients with RRMS or as an alternative to other currently available therapies. PMID:23971970

Havrdova, Eva; Hutchinson, Michael; Kurukulasuriya, Nuwan C; Raghupathi, Kartik; Sweetser, Marianne T; Dawson, Katherine T; Gold, Ralf

2013-08-24

199

Accurate calibration of the laser Raman system for the Karlsruhe Tritium Neutrino Experiment  

NASA Astrophysics Data System (ADS)

The Karlsruhe Tritium Neutrino (KATRIN) experiment aims to measure the neutrino mass via high-precision electron spectroscopy of the tritium ?-decay with a sensitivity of m? = 200 meV/c2 (90% C.L.). This can only be achieved if systematic uncertainties are minimized. An important parameter is the isotopic composition of the tritium gas used as the gaseous ?-electron source, which is measured inline by Raman spectroscopy. The KATRIN experiment requires a measurement trueness of better than 10% of said composition; to achieve this, accurate calibration of the Raman system for all hydrogen isotopologues (H2, HD, D2, HT, DT, T2) is required. Here we present two independent calibration methods, namely (i) a gas sampling technique, which promises high accuracy, but which is difficult to apply to tritiated species; and (ii) an approach via theoretical Raman signals (theoretical intensities plus spectral sensitivity), which in principle includes all six isotopologues. For the latter method we incorporated ab initio off-diagonal matrix elements of the polarizability from the literature; these have been verified by depolarization measurements. The system's spectral sensitivity was determined by a NIST-traceable SRM2242 luminescence standard. Both methods exhibited their individual merits and difficulties, but in cross calibration proved to be successful: a comparison for the non-radioactive isotopologues (H2, HD, D2) yielded agreement to better than 2% for the relative Raman response function. This is within the estimated (dominant) uncertainty of the theoretical Raman signal approach of about 3%. Therefore, one can be confident that, when using this approach, the trueness requirement of 10% for the KATRIN-relevant species (T2, DT, D2 and HT) will in all likelihood be exceeded.

Schlösser, Magnus; Rupp, Simone; Seitz, Hendrik; Fischer, Sebastian; Bornschein, Beate; James, Tim M.; Telle, Helmut H.

2013-07-01

200

Neutron spin filter based on optically polarized 3He in a near-zero magnetic field  

NASA Astrophysics Data System (ADS)

A test of polarization of 3He nuclei via spin-exchange collisions with optically pumped rubidium atoms in an extremely low applied magnetic field was carried out. Permalloy magnetic shields were used to prevent a fast relaxation of 3He polarization owing to the inhomogeneity of a surrounding magnetic field. The whole installation was placed at the neutron beam line of the IBR-30 facility, and used as a neutron spin filter. Thus, a prototype of new design of neutron polarizer was introduced. We intend to apply this experience for the full-scale KaTRIn facility to test the time reversal violation in neutron-nuclear reactions.

Skoy, V. R.; Prokofichev, Yu. V.; Sorokin, V. N.; Kolachevski, N. N.; Sobelman, I. I.; Sermyagin, A. V.

2003-04-01

201

Lattice vacancies in silicon film exposed to external electric field  

NASA Astrophysics Data System (ADS)

Density functional calculations based on wavelet basis set are performed to investigate the structure, internal electric-charge distribution, and formation energy of lattice vacancies in silicon film under electric fields. It was found that the formation energies of vacancies both in JT? (Jahn-Teller distortion orthogonal to electric field) and JT|| (Jahn-Teller distortion parallel to electric field) distortions are decreased with the increasing of field strength, due to the charge polarization in the whole space of silicon film. For the split vacancy, it can lower its energy by moving further away from the split space to form a tetragonal JT? vacancy under electric field. Our results also demonstrate the importance of the potential fluctuations induced by the electric fields on the charge redistribution within the vacancy defects.

Mao, Yuliang; Caliste, Damien; Pochet, Pascal

2013-07-01

202

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

NASA Astrophysics Data System (ADS)

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

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

2013-09-01

203

Performance Investigations of a 4 to 10 K Long-Life Mechanical Cryocooler  

NASA Astrophysics Data System (ADS)

We believe that the quickest way of obtaining a reliable space cooler in the range of 4 to 10 K is to combine a Stirling mechanical cooler with a Joule-Thomson (J-T) cooler. In this approach we perform the bulk of the cooling with the Stirling cooler and use the J-T cooler for the small amount of cooling required at the lowest temperatures. The recuperative J-T stage can reach low temperatures more easily because it does not have the regenerator limitations shared by Stirling and Pulse Tube mechanical coolers. We present our system concept in detail and discuss its merits. To demonstrate the capabilities of a hybrid cooler, we built a breadboard version consisting of a precooler, a J-T circulating compressor, and a cold head. With it we achieved closed-cycle refrigeration rates of 35 mW at 6 K and 10 mW at 3.7 K. For simplicity we used a commercial Gifford McMahon (GM) refrigerator as our precooler and focused on building the J-T compressor and passive cold head. The J-T compressor was an Oxford-style linear compressor equipped with an external reed valve package. The cold head consisted of heat exchangers, heat sinks, and an expansion valve. The system worked quite well. The performance was transparent and the results agreed with our analytical models. We are proceeding with the construction of a full engineering model on a NASA technology development program, the Advanced Cryocooler Development Program (ACTDP). Within 2 years we will have a complete engineering model of the mechanical cryocooler capable of 4 K operation.

Gully, W. J.; Glaister, D.; Marquardt, E.

2004-06-01

204

Relaxation process of charge transfer in C60: A normal mode analysis  

NASA Astrophysics Data System (ADS)

By normal mode analysis a novel picture of the relaxation process of charge transfer in C60 is discovered. It is found that after one electron is transferred to C60, only a few normal modes with even parity can be invoked. A Jahn-Teller (J-T) theorem predicts that only the Ag and Hg modes are J-T active, while our results show that theAg mode exchanges energy with the system nearly harmonically, and the Hg mode dominates the relaxation process. This can be understood from their explicit eigenvectors. Implications for mode-selective chemistry and biological processes are discussed.

Zhang, P. G.; Zong, X. F.; Sun, X.; George, Thomas F.; Pandey, Lakshmi N.

1996-02-01

205

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

NASA Astrophysics Data System (ADS)

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 ~2 m2. 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- ion beams for 100 s.

Kojima, A.; Hanada, M.; Hilmi, A.; Inoue, T.; Watanabe, K.; Taniguchi, M.; Kashiwagi, M.; Umeda, N.; Tobari, H.; Kobayashi, S.; Yamano, Y.; Grisham, L. R.

2012-02-01

206

Local structure of La1-xSrxCoO3 determined from EXAFS and neutron PDF studies  

SciTech Connect

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

Proffen, Thomas [Los Alamos National Laboratory; Sundaram, Nalini [UCSC; Jiang, Y [UCSC; Anderson, Ingrid [UCSC; Belanger, D P [UCSC; Booth, C H [LBNL; Bridges, F [UCSC; Mitchell, J F [ANL; Zheng, H [ANL

2008-01-01

207

Creep Function of a Single Living Cell  

Microsoft Academic Search

We used a novel uniaxial stretching rheometer to measure the creep function J(t) of an isolated living cell. We show, for the first time at the scale of the whole cell, that J(t) behaves as a power-law J(t)=At?. For N=43 mice myoblasts (C2-7), we find ?=0.24±0.01 and A=(2.4±0.3) 10?3 Pa?1 s??. Using Laplace Transforms, we compare A and ? to

Nicolas Desprat; Alain Richert; Jacqueline Simeon; Atef Asnacios

2005-01-01

208

Program master plan  

NASA Astrophysics Data System (ADS)

The purpose of the Identification Friend, Foe, or Neutral Joint Test and Evaluation (IFFN JT/E) is to assess baseline US capabilities within the North Atlantic Treaty Organization (NATO) air defense command and control (C2) system to perform the IFFN function, identify deficiencies in the performance of that function, and propose potential near-term procedural and equipment modifications for further testing. The purpose of this document is to serve as an internal management tool, provide an overview of the objectives, background, concept of execution, resource requirements, and acquisition concept of the IFFN JT/E and to provide an umbrella document identifying the roles of all participating agencies.

1984-01-01

209

Direct neutrino mass measurements  

NASA Astrophysics Data System (ADS)

The determination of the neutrino rest mass plays an important role at the intersections of cosmology, particle physics and astroparticle physics. This topic is currently being addressed by two complementary approaches in laboratory experiments. Neutrinoless double beta decay experiments probe whether neutrinos are Majorana particles and determine an effective neutrino mass value. Single beta decay experiments such as KATRIN and MARE investigate the spectral shape of ?-decay electrons close to their kinematic endpoint in order to determine the neutrino rest mass with a model-independent method. Owing to neutrino flavour mixing, the neutrino mass parameter appears as an average of all neutrino mass eigenstates contributing to the electron neutrino. The KArlsruhe TRItium Neutrino experiment (KATRIN) is currently the experiment in the most advanced status of commissioning. Applying an ultra-luminous molecular windowless gaseous tritium source and an integrating high-resolution spectrometer of MAC-E filter type, it allows ?-spectroscopy close to the T 2 end-point with unprecedented precision and will reach a sensitivity of 200 meV/ c 2 (90% C.L.) on the neutrino rest mass.

Thümmler, T.

2011-07-01

210

MiniBooNE results and neutrino schemes with 2 sterile neutrinos: possible mass orderings and observables related to neutrino masses  

NASA Astrophysics Data System (ADS)

The MiniBooNE and LSND experiments are compatible with each other when two sterile neutrinos are added to the three active ones. In this case there are eight possible mass orderings. In two of them both sterile neutrinos are heavier than the three active ones. In the next two scenarios both sterile neutrinos are lighter than the three active ones. The remaining four scenarios have one sterile neutrino heavier and another lighter than the three active ones. We analyze all scenarios with respect to their predictions for mass-related observables. These are the sum of neutrino masses as constrained by cosmological observations, the kinematic mass parameter as measurable in the KATRIN experiment, and the effective mass governing neutrinoless double beta decay. It is investigated how these non-oscillation probes can distinguish between the eight scenarios. Six of the eight possible mass orderings predict positive signals in the KATRIN and future neutrinoless double beta decay experiments. We also remark on scenarios with three sterile neutrinos. In addition we make some comments on the possibility of using decays of high energy astrophysical neutrinos to discriminate between the mass orderings in presence of two sterile neutrinos.

Goswami, Srubabati; Rodejohann, Werner

2007-10-01

211

Analysis of simulated data for the KArlsruhe TRItium Neutrino experiment using Bayesian inference  

NASA Astrophysics Data System (ADS)

The KATRIN (Karlsruhe Tritium Neutrino) experiment will analyze the tritium ? spectrum to determine the mass of the neutrino with a sensitivity of 0.2 eV (90% C.L.). This approach to a measurement of the absolute value of the neutrino mass relies only on the principle of energy conservation and can in some sense be called model-independent as compared to cosmology and neutrinoless double ? decay. However, by model independent we only mean in case of the minimal extension of the standard model. One should therefore also analyze the data for nonstandard couplings to, e.g., right-handed or sterile neutrinos. As an alternative to the frequentist minimization methods used in the analysis of the earlier experiments in Mainz and Troitsk we have been investigating Markov chain Monte Carlo (MCMC) methods which are very well suited for probing multiparameter spaces. We found that implementing the KATRIN ?2 function in the cosmomc package—an MCMC code using Bayesian parameter inference—solved the task at hand very nicely.

Sejersen Riis, Anna; Hannestad, Steen; Weinheimer, Christian

2011-10-01

212

Absolute neutrino mass measurements  

SciTech Connect

The neutrino mass plays an important role in particle physics, astrophysics and cosmology. In recent years the detection of neutrino flavour oscillations proved that neutrinos carry mass. However, oscillation experiments are only sensitive to the mass-squared difference of the mass eigenvalues. In contrast to cosmological observations and neutrino-less double beta decay (0v2{beta}) searches, single {beta}-decay experiments provide a direct, model-independent way to determine the absolute neutrino mass by measuring the energy spectrum of decay electrons at the endpoint region with high accuracy.Currently the best kinematic upper limits on the neutrino mass of 2.2eV have been set by two experiments in Mainz and Troitsk, using tritium as beta emitter. The next generation tritium {beta}-experiment KATRIN is currently under construction in Karlsruhe/Germany by an international collaboration. KATRIN intends to improve the sensitivity by one order of magnitude to 0.2eV. The investigation of a second isotope ({sup 137}Rh) is being pursued by the international MARE collaboration using micro-calorimeters to measure the beta spectrum. The technology needed to reach 0.2eV sensitivity is still in the R and D phase. This paper reviews the present status of neutrino-mass measurements with cosmological data, 0v2{beta} decay and single {beta}-decay.

Wolf, Joachim [Karlsruhe Institute of Technology (KIT), IEKP, Postfach 3640, 76021 Karlsruhe (Germany)

2011-10-06

213

Goal-Directed Supervision of Social Work Students in Field Placement  

ERIC Educational Resources Information Center

Presents a goal-directed paradigm for supervision of social work students in a field placement within a Veterans Administration Drug Abuse Program. Included is a rational breakdown of five phases in placement: screening, minimum orientation, Goal Work Sheet, body of placement, and evaluation and closure. (Editor/JT)

St. John, David

1975-01-01

214

US EPA, Pesticide Product Label, GENERAL DISINFECTANT ...  

EPA Pesticide Factsheets

... ' I ')Ullll~S dhl,lf"I, 1dl>! rw, 'ldll(J11 iJf :,.,HI;' fUI ,I ;r,j",,, I'105(;t5, 'ldlt)d'l" It,,":klldCI,;s, \\cJt)I,: tU,","J, il-,I,'ph'_."I' 11ICJuthplel.l:,>, dl1,i ',,' 'I"'!<" IOf,JS , ...

2011-04-21

215

Hookup Security for Synchronous Machines  

Microsoft Academic Search

The author further delineates and improves the evidence that nondeducibility on strategies is a respectable candidate for a definition of security against information compromise, at least for the class of systems that can be modeled as synchronized state machines. First, the author confirms the thesis of J.T. Wittbold and D.M. Johnson (1990) that nondeducibility on strategies is stronger than the

Jonathan K. Millen

1990-01-01

216

US EPA, Pesticide Product Label, AMADOR TRIO, 11/20/1975  

EPA Pesticide Factsheets

... bage iPa.lt~. . For' :u'S~\\ ttji 'ho 'illi~i'\\J 'li :ouote':') ~i \\9:.ajiotw "'iU~ bt: tC!- qoJt~~(!! ... ' .' '" i Effeci!ve agai:;l~~ li£~udfl¥~~

2011-04-14

217

US EPA, Pesticide Product Label, ALPHA 521, 10/09/1975  

EPA Pesticide Factsheets

... '. :~ li\\ ~ ,l~if' \\\\':dt~'r T r~'d':!!!_li't (j~")·(r-;. h 11 !() .. ... ',' r!~ ;i:~:'i\\'1 \\i,C!"{jt)!{I~'II_jl ;;",1: .. '. it' -),'1\\" fl)~J:l(j trl :t'L;f( .;·.Ir t. " ,. ; eLorH~rn jl~;li TC. ...

2011-04-19

218

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

219

The CUNY Experience  

ERIC Educational Resources Information Center

The Vice-Chancelor for Administration of the City University of New York (CUNY) gives an anecdotal account of the experience at CUNY, the first major university to negotiate and enter into a contractual relationship with its faculty. Emphasis is on the problems encountered, their ultimate resolution, and questions that remain unresolved. (JT)

Mintz, Bernard

1971-01-01

220

US EPA, Pesticide Product Label, (R) GUTHION CITRUS 62.5 ...  

EPA Pesticide Factsheets

... f~"t r'; ~ !t Pl, I. J "J',~'t \\:'Y ; '111;1, ,. J!, I". :1,"1' ,1 ~ ff,! t (:: ~~I' '_\\ Iii 1!', ! t',~l: it, Iilllltfld l~' ;If~ l! .Lfn! l.'t ,j'!; ·,t',ll: f' , If' !I:'~! , r~( t Illd i" !.!: ...

2011-04-21

221

VINCULAÇÃO PARENTAL DURANTE A GRAVIDEZ: VERSÃO PORTUGUESA DA FORMA MATERNA E PATERNA DA ANTENATAL EMOTIONAL ATTACHMENT SCALE  

Microsoft Academic Search

The maternal and the paternal forms of the Antenatal Emotional Attachment Scale (AEAS; J.T. Condon, 1993) were adapted for use with Portuguese expectant parents. Both Portuguese forms of the AEAS have a good level of internal consistenc y and test-retest stability. We also analysed the association of the scores in AEAS with time of gestation, age, parental experience, marital adjustment,

Rita Gomez; Isabel Leal

222

The Tribulations of the Free University of Berlin  

ERIC Educational Resources Information Center

|The Free University of Berlin is, according to the authors, not an institution of higher learning but of permanent political agitation. They trace the historical consequences of the institutionalization of the student revolt of the 1960's through legislation enacted by the states to reform the universities. (JT)|

Domes, Jurgen; Frank, Armin Paul

1975-01-01

223

US EPA, Pesticide Product Label, , 08/05/1994  

EPA Pesticide Factsheets

... 13~~ ~~st lount Av~nue 0e~ Plaines, l~ 6uulb Jt:at .;(. flckle: AUG ~~D)ECt: Dftri~lCA~~~ bSn~ herbiciut: 1994 LPft KeSlsttdtlun hU. ~~947-4j , " ...

2011-04-21

224

Zero-temperature insulator-metal transition in doped manganites  

Microsoft Academic Search

We study the transition at T = 0 from a ferromagnetic insulating to a ferromagnetic metallic phase in manganites as a function of hole doping using an effective low-energy model Hamiltonian proposed by us recently. The model incorporates the quantum nature of the dynamic Jahn-Teller (JT) phonons strongly coupled to orbitally degenerate electrons as well as strong Coulomb correlation effects,

G. Venketeswara Pai; S. R. Hassan; H. R. Krishnamurthy; T. V. Ramakrishnan

2003-01-01

225

US EPA, Pesticide Product Label, , 08/01/1974  

EPA Pesticide Factsheets

... f" '1\\ I\\t"' ('jOl)'''' 1 ~ , 'I 1 "4 , '-' r·' ... I .1- ~4'J'" II, ' )nt" , , ? J Ie ~ ,)'J'lre ,\\J..}dCt> R"",'JI ~, 1;t'~(jt"C l '""' T 1,-,". r;,; ;IIJ' ("'lld,r', If) tr~ntf"d ';'t' .,ft',! .:dft .. ...

2011-04-14

226

US EPA, Pesticide Product Label, RIVERSIDE 2.5% METHYL ...  

EPA Pesticide Factsheets

... c drl1 re\\(J"dtO't ce- pr t'\\~ (In At f,. ,\\,f,)"" u' Pu:ft1,:"n.Hy f'"m., '''4! Pl.' o:""l $'10 .? '.J t'lt Q ".'" ~J"'''' Pro"f""'.,t v)".:ten An., ,·.U '>,tTI,' .r,', J .. Cvn"('llJt"'l .t ...

2011-04-21

227

Forward velocity effects on fan noise and the suppression characteristics of advanced inlets as measured in the NASA-Ames 40 by 80 foot wind tunnel  

Microsoft Academic Search

Forward velocity effects on the forward radiated fan noise and on the suppression characteristics of three advanced inlets relative to a baseline cylindrical inlet were measured in the NASA Ames Research Center 40 x 80 foot Wind Tunnel. A modified JT15D turbofan engine in a quiet nacelle was the source of fan noise; the advanced inlets were a Conventional Takeoff\\/Landing

M. T. Moore

1980-01-01

228

A numerical model of resistive generation of intergalactic magnetic field at cosmic dawn  

Microsoft Academic Search

Miniati and Bell (2011) proposed a mechanism for the generation of magnetic seeds that is based the finite resistivity of the low temperature IGM in the high redshift universe. In this model, cosmic-ray protons generated by the first generation of galaxies, escape into the intergalactic medium carrying an electric current that induces return currents, $j_t$, and associated electric fields, $\\\\vec

Francesco Miniati; A. R. Bell

2011-01-01

229

Law School Stress and the "Deformation Professionelle"  

ERIC Educational Resources Information Center

|Evidence from various psychological, sociological, and informal group studies is examined to determine psychological, emotional, and moral effects of legal training. Results show no proof that claimed personality changes exist and (if they do) that they are a result of stress. Conclusions suggest no changes in legal education. (JT)|

Taylor, James B.

1975-01-01

230

Toshiba Review International Edition No. 160, Summer 1987.  

National Technical Information Service (NTIS)

Contents: Ion cyclotron range of frequencies heating system for the JT-60; Recent developments and applications of AC variable-speed drives for rolling mill main stands; X-ray CT scanner for heavy and valuable components; Iron-yoke resistive MRI, model MR...

1987-01-01

231

Assessing Competence in Pediatric Cardiology  

ERIC Educational Resources Information Center

|In response to the need to assure physician competence, a rating scale was developed at the University of Minnesota Medical School for use in evaluating clinical competence in pediatric cardiology. It was tested on first- and second-year specialists. Development and testing procedures are described. (JT)|

Johnson, Apul E.; And Others

1976-01-01

232

US EPA, Pesticide Product Label, KATADYN SYPHON ...  

EPA Pesticide Factsheets

... 'I"~_I~'!l: .? 1(11"" ""'1 ,,,.'l',d;~r> t" fl"·",, instr"'-tl'.lI'·" rl ... ... hOll"ln!: an,J "p,'n II", 1,,1<,[ and U,,[jt'l t.,1' cll th" fllt,'r, Ih" jnlt-L,I "'.lte~ ""ming ,n,t ,,[ tlIP rlll ...

2011-04-21

233

Economic Observations on the Decision to Attend Law School  

ERIC Educational Resources Information Center

On the premise that the expected benefits of a legal education can be measured in dollar terms, the author develops a formula for determining whether or not to matriculate based on expected earnings, educational costs, and probability of employment (graduation, class rank, passing bar exam, and supply/demand conditions). (JT)

Ahart, Alan M.

1975-01-01

234

US EPA, Pesticide Product Label, KEROL DISINFECTANT, 03 ...  

EPA Pesticide Factsheets

... fi ~I r: i ~, , If'j a II S clilll ' ~ H f d c: h ': h (J : i IS pen c: , d I :~tal:~, chutl:s (];:d nthu ~~L.ii~t:~~ d:HI flx- turp~ :Jt.:r:lljJIHl "I travprsed by drlll1lal~. Eillpty ...

2011-04-13

235

US EPA, Pesticide Product Label, HENRY FIELD'S NEW ...  

EPA Pesticide Factsheets

... Ai'Illy at the Rate of 11..4 oUlIce per 100 tl,,:uure fed. ... titan to for'm) V<.i\\~I!Y I.iliJt ... BI~:;om IV "j,!, D<;w"y ~.lduL ...

2011-04-14

236

The Campus Press: Slouching Toward Respectability  

ERIC Educational Resources Information Center

|In a survey discussion on the state of college newspapers the author observes that the campus press has at last shaken its radical image and returned to respectability: a preprofessional attitude by the staff, interest in investigative reporting, and a concern for the source of the next dollar. (JT)|

Rubin, David

1976-01-01

237

A Profile of Clinical Nutrition Knowledge Among Physicians and Medical Students  

ERIC Educational Resources Information Center

|An assessment of the clinical nutritional knowledge of third- and fourth-year medical students and practicing physicians revealed that overall nutritional knowledge is modest and that knowledge is highest among topics which have received the most publicity in the popular press. Methodology and specific findings are included. (JT)|

Podell, Richard N.; And Others

1975-01-01

238

The Use of Test Results from ASA Workshops to Evaluate Workshop Effectiveness  

ERIC Educational Resources Information Center

|Results of test given to participants in six American Society of Anesthesiologists workshops were analyzed to determine whether attendance increased scores on sequential tests (before, immediately after, and three months later). Both workshop and control groups of anesthesiologists increased their scores with each successive test. (Editor/JT)|

Donegan, Judith H.; And Others

1976-01-01

239

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

ERIC Educational Resources Information Center

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

Steinbach, Sheldon Elliot; Reback, Joyce E.

1974-01-01

240

US EPA, Pesticide Product Label, SUMMIT PERMACIDE P-1 ...  

EPA Pesticide Factsheets

... j't:" II~~" 4., .1 ?? .. "1 t. ,tt,t .U;'". "UIU, cu,lli 1'!ltl'IU', J~I_a4" h' :, .. 1111. ,r.,. '1 .... (I. rh4u .. ... elll!l)' I .... /JI Jf hU",~d ?? , ~ .h~r)tf ti~:fl' (h~. '.al; ;~":JU a( If:.! ...

2011-04-14

242

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.

243

US EPA, Pesticide Product Label, BEST 4 SERVIS BRAND ...  

EPA Pesticide Factsheets

... u·,· .. t It tl[l:I, ul tI'pl:. Itl')/l dnI~, 'I ~,'Jt I:.tl:: .? : lt'· !I,Il~ 'I- !:.lll'\\l:J.~ utt'L:--:l.-, n·,r ~J:-," In l"t· t:-- .\\L,!' .11::,:: I\\'·!' J\\",:dil'. ,I1'!)ll.ttl"L-.\\:th.n"l;;';'I':--, ...

2011-04-21

244

The Role of Government in EFT. Part II. Testimony Presented to the National Commission on Electronic Fund Transfers, November 12, 1976.  

National Technical Information Service (NTIS)

The witnesses who testified at this public hearing on EFT (Electronic Funds Transfer) are: D.I. Baker, U.S. Department of Justice; J.J. Reynolds, Interbank Card Association; R. Capone, J.C. Penney Co.; J.T. Ellington, Jr., U.S. Postal Service; T.H. Huston...

1977-01-01

245

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

NASA Astrophysics Data System (ADS)

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

Shimazaki, T.

2013-09-01

246

US EPA, Pesticide Product Label, PROTEXALL FLEA & TICK ...  

EPA Pesticide Factsheets

... "'fA r Ii t. cJt tnf ... t,·rI" ,., t rl t, II I , Y ~ ~ 'I') 1 I , 1 " f'rU'JII! " ~, . TI,~Gt- .It "'Ljr,j1Ilff~' ., t !, f'" II' l.Jd) 1 h " 'I If"t~·l . .~f" str,)rlq 1), , .. j "t'v"-ret .. ...

2011-04-14

247

The Role of the Federal Government in Financing Health and Medical Services  

ERIC Educational Resources Information Center

|This analysis of public and private sector spending for health services shows they have paralleled each other for four decades although total expenditures have grown dramatically. Since 1966 the federal government's major participation has been through the Medicare trust fund. Need for larger government role is predicted. (Editor/JT)|

Bloom, Bernard S.; Martin, Samuel

1976-01-01

248

US EPA, Pesticide Product Label, PROFAL PHOSPHATE ...  

EPA Pesticide Factsheets

... 'u!t':',r:: ... u~) ::: t: }'::J :::~lXlf:~:~r~~ t-,Lt':';:vpnr':':;s, apI):Y Pr()'!" f;\\' h:~fh :,.10'''''1''' 'C' ..:r'l .'.' ! Jt 't'll' '''t'· "I l')"" ... lK.'--·s, F~c~;.r1S ::Jr:n str';C1!T ...

2011-04-21

249

US EPA, Pesticide Product Label, ALGAECIDE #4, 08/22 ...  

EPA Pesticide Factsheets

... thilt C~IIHlot be us(:d or reprOCf ';sed should be d,~posed of in a I.mdfjl ... J" fUw/l r flit' FI'II< r ?? l Itl'll "etd", "'Il'/j~', ,,Jt· "'ul H ?? oI, nt" ,.I" A. I. ; ... 1/11' lid ... II ...

2011-04-21

250

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.

251

Testing Advanced Distributed Simulation for Use in Electronic Warfare Test and Evaluation.  

National Technical Information Service (NTIS)

The JADS JT&E program is an OSD sponsored Joint-Service test designed to determine how well an emerging technology - Advanced Distributed Simulation (ADS) - can support DoD test and evaluation (T&E) activities. The two-phase ADS test using an Electronic W...

D. Wright C. Harris

1998-01-01

252

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

253

US EPA, Pesticide Product Label, TURF PRIDE WITH .67% ...  

EPA Pesticide Factsheets

... 3·)'J2..",-J'...: ru r:-Jt; 1,::: __ -"::.1 :....C.[f.: /v.: (':It"..J!.:)e rfa.' i (0 .',.;ct ~{..:r SL1;',;·t:-rr >uLI~.lt GIlt..· \\! C('f~~ c; tl,~ L!L.-dt·Il::rf.'~; 121.,CI-llr: ?. ...

2011-04-21

254

The Validity of Warrantless Searches under the Occupational Safety and Health Act of 1970  

ERIC Educational Resources Information Center

One of the most controversial federal acts providing for random administrative searches is the Occupational Safety and Health Act of 1970 (OSHA). The author reviews the search and seizure law and concludes that abandonment of Fourth Amendment rights should not be predicated on the mere convenience of even a justifiable regulatory scheme. (JT)

Shanks, Michael D.

1975-01-01

255

US EPA, Pesticide Product Label, AMOCO 2,4,5-T LV ESTER ...  

EPA Pesticide Factsheets

... ''1t' r)~ "t'!.fnp fl' ~"I, ,Hhf' .', ~t' ~-'q .,~, . p'! ""' t} ~.t~ '".1.1''' drll, '.,h t ·!::' pr·· t·. ,·,1f.1 :. III ~i~ f~ .\\:1 "''''J\\t' .lrt~ 1,It,.,_", ~ Jr.': '~t'r ,t r1alri ..... ...

2011-04-14

256

US EPA, Pesticide Product Label, SELIG'S VPA EMULSIBLE ...  

EPA Pesticide Factsheets

... tpo.J )! ;~,p~jt·.,,,lt'l.("'I"·':r:SI.!r.· "t!,r,.t'"~ .~s .. P!.'}d.\\S~: \\~It\\~( H;~~ .~t:tf,tot1'llft·· tftlI·fb'btt.' 'Wttit' [JcW~t:: \\i.1t·:X~~;t~·~: ~l!IHIW~'~!J- ':,~J::;"'l nt' ·t ...

2011-04-14

257

Annual Report of the Naka Fusion Research Establishment for the Period of April 1, 1987 to March 31, 1988.  

National Technical Information Service (NTIS)

Research and development activities of the Naka Fusion Research Establishment for the period of April 1987 to March 1988 are described. In JT-60, the plasma heating experiment aiming at a reactor-grade plasma was started in June 1987, after completing the...

1988-01-01

258

US EPA, Pesticide Product Label, HELENA 4 LB METHYL ...  

EPA Pesticide Factsheets

... 1 t"ne, ut 7 , 10· day Il1ter"jl, F()rnd ,>PO"n , ["I (()n1f~)1 apply aT 1;'L '.tar' 'Jt c ... RICE: f'II' ',1",> pit'!', 1,1' :(I..,t",~: 'l"d '!!1P' 'turd If·'-,c!l: '\\! ' P'! I '.J'. If' 'llff",1r ...

2011-04-14

259

US EPA, Pesticide Product Label, QUAT DF 3.2, 04/16/1984  

EPA Pesticide Factsheets

... a~nc"- .. ,j(·""·t"), Adf'nol vtt.\\ r ... ~·jO ~et".r f""_fltat,;., . t"!~o:tt.-:\\a' .... llf1'" .'+ t~~ pow vlf"u. ,'~v~). I~~ a..r 'W ffflc.ec,! t.et. ' .? v .. «!e ..... fut ... ...

2011-04-21

260

Summary of Conceptual Design Study of Fusion Experimental Reactor (FER). FY 1984 Report.  

National Technical Information Service (NTIS)

Since 1980 the design study has been conducted at JAERI for the Fusion Experimental Reactor (FER) which has been proposed to be the next machine to JT-60 in the Japanese long term program of fusion reactor development. Starting from 1984 FER design is now...

1985-01-01

261

US EPA, Pesticide Product Label, , 03/10/2004  

EPA Pesticide Factsheets

... ti,"' ,~nOIl'" n<'lrno;>d p'::'sti("id,::, 1 ;" ho;>r~by r,::,ql.<Jt~f""d/ n;>t·~qi 5f'::'r .... d ,Inti'::'l fh ... f,::,ot'Ldl J II:-;",t i c· id"" fUllqicidt' -'lnd Rod,::,nt i("id.,.. Act. ...

2011-04-21

262

US EPA, Pesticide Product Label, AMOCO 2, 4, 5-T LV ESTER ...  

EPA Pesticide Factsheets

... t" ? \\ ' j 'f ~.''; I \\.'\\" j' 1 '-'tly~'(ldl·, d 111!)td·.ltely I! . ".,t' ,t, ';\\ ~r' 1";'- ,1'1'(1',' (. w,jt'~f ft'r 15 rl)lf~dtt·· qt~t ;If(I'' pi ~\\ 1,," ~' fl .'It''V ,If~.: ? 't"" q ...

2011-04-14

263

An Englightened Legal Pedagogy for Today  

ERIC Educational Resources Information Center

|A 3-year law curriculum is outlined based on studying law as an applied social science to maximize its relevance to social life. The author contrasts it to curriculum designed to create technocrats competent in the legislative process and notes that immense changes would be necessary to implement such a curriculum. (JT)|

Sinha, S. Prakash; Elder, Philip S.

1976-01-01

264

A mixed-gas miniature Joule-Thomson cooling system  

NASA Astrophysics Data System (ADS)

A mixed-gas Joule-Thomson (JT) cooling system is investigated in which a micromachined JT cold stage of 60 × 10 × 0.7 mm3 is combined with a linear compressor. The cooling system is operated between 1.3 bar and 9.4 bar with a ternary gas mixture of 39 mol% methane, 20 mol% ethane and 41 mol% isobutane. It cools down to below 130 K, and at a cold-tip temperature of 150 K, a cooling power of 46 mW is obtained at a mass-flow rate of 1.35 mg s-1. The background losses are experimentally determined to be 20 mW and are in good agreement with the calculated value of 21 mW. The linear compressor can be used to drive 19 of these miniature JT cold stages in parallel, e.g. for cooling optical detectors in future space missions. In this mode, the compressor pressure ratio is slightly less, resulting in a net cooling power of 23 mW per miniature JT cold stage.

Derking, J. H.; Vermeer, C. H.; Tirolien, T.; Crook, M. R.; ter Brake, H. J. M.

2013-10-01

265

US EPA, Pesticide Product Label, AS-406 SP, 09/14/1981  

EPA Pesticide Factsheets

... '~ It, ".ld .11, if 11.11 ( il ' .... 1 'II 1., lIt"! Ilu,fj (j"t,. t:~ 1,1 :.'-, 1 ')p 1,,'1 lei ?? ", 'jd''''' t ",".111'1 .tlul '.'I1I1'lIt· ""11: .. 11 .li(j.J'· d"II'I'> I",. ,led,,:1 'I fr" 'If .!. ...

2011-04-21

266

US EPA, Pesticide Product Label, ANCHOR-100, 09/27/1984  

EPA Pesticide Factsheets

... iutt'I'...! ii;t;ei ;.lt,{)n vt 1..1ildl ptliltec lut" ..!.lil{.1. 11 t!Jt"t~ {'"III(111101IS (lre Ilut CUI;ll'l1t'll Wltl), tljt:' tt"jl;.,cl<.1t1GIJ .... ·111 l!{' I \\.Ju; ! t-' J t ,/. ,I:' ...

2011-04-21

267

Performance of a MEMS Heat Exchanger for a Cryosurgical Probe  

Microsoft Academic Search

This paper presents the experimental test results for two 2 nd generation Micro-Electro- Mechanical Systems (MEMS) heat exchangers that are a composite of silicon plates with micro- machined flow passages interleaved with glass spacers. The MEMS heat exchangers were designed for use as the recuperative heat exchanger within a Joule-Thomson (JT) cycle used to energize a cryosurgical probe. The heat

M. J. White; W. Zhu; G. F. Nellis; S. A. Klein; Y. B. Gianchandani

268

Continuing Education for Women, 1960-75: A Critical Appraisal  

ERIC Educational Resources Information Center

Examines assumptions and issues underlying the development of continuing education programs for women. Assesses patterns of discontinuous vs. continuous education, accommodation to social norms vs. change, separatist vs. nonseparatist education, and remedial vs. a preventive approach to role definition and lifetime planning. (Editor/JT)

Rice, Joy K.

1975-01-01

269

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

Microsoft Academic Search

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

Sebastião da Costa Paolinelli; Marco Antônio da Cunha; André Barros Cota

2008-01-01

270

Defining prognostic factors in the elderly with community acquired pneumonia: a case controlled study of patients aged ?75 yrs  

Microsoft Academic Search

Defining prognostic factors in the elderly with community acquired pneumonia: a case controlled study of patients aged ¢75 yrs. W.-S. Lim, J.T. Macfarlane. #ERS Journals Ltd 2001. ABSTRACT: Severity assessment in the elderly with community acquired pneumonia (CAP) may be different compared with younger patients. In particular, age per se may not be of prognostic significance in older patients. A

W. S. Lim; J. T. Macfarlane

2001-01-01

271

A Performance-Based Method of Student Evaluation  

ERIC Educational Resources Information Center

|The Problem Oriented Medical Record (which allows practical definition of the behavioral terms thoroughness, reliability, sound analytical sense, and efficiency as they apply to the identification and management of patient problems) provides a vehicle to use in performance based type evaluation. A test-run use of the record is reported. (JT)|

Nelson, G. E.; And Others

1976-01-01

272

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

273

US EPA, Pesticide Product Label, CHEMSICO AEROSOL ...  

EPA Pesticide Factsheets

... Bs·.lHflded;·ftJt'1 .. *·~t~ht~· . 99.965% ?6~~~~~n~~~it~~~:~d·i~tiil·~t·~~:· ncis __ :....ten4_q:.t~iJllUI...a...~.l·'m'~··t'.&-.._~·...N& .. · .. ...

2011-04-21

274

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

ERIC Educational Resources Information Center

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

Edwards, Charles A.

1974-01-01

275

US EPA, Pesticide Product Label, ORTHO DIFOLATAN 4 ...  

EPA Pesticide Factsheets

... dljf'I'1 01 'f'IIff'\\"',af!'Jt '(1 nljtkp ~11~ nlhr! t\\dlf~ "[lft\\Pl1lahr.n f'lprP"\\ 01 lm;lh,r1 ,("t'lr,'fllnrl'"'' 'l1attlfl -: r"flf ,tl J:ld 1,1'f{l!p"'~Pdh;' fal ")". :nllr. rtJl'~'OII <;. ...

2011-04-13

276

Ralf Dahrendorf's Vision for the London School of Economics  

ERIC Educational Resources Information Center

|The goal of Ralf Dahrendorf, new director of the London School of Economics (LSE) is to restore the school's international reputation for the study of modern social science at both undergraduate and graduate levels with emphasis on the political role of social science knowledge. (JT)|

Walker, David

1976-01-01

277

US EPA, Pesticide Product Label, TIDE MALATHION 5 DUST ...  

EPA Pesticide Factsheets

... i.'-'" lil .. \\i> L' ,'-' I,; I'I(J..{':l'II<):-; ilJt' it'b'; .. ~ ...

2011-04-14

278

US EPA, Pesticide Product Label, ANCHOR-105A, 09/14 ...  

EPA Pesticide Factsheets

... r I L Alle/lut COIl'()L'dtlOIJ ~.!.l.-i Jt'xtt-'! ~it. t--'.U. Hux tJ)~ Ij 1 I '1 ~ ti I vll .J ... 111 It rll!','"p conditIon.'., 'tI«:' not cor~.plled wittl, the reyistta.tl(!f1 '..Ill J t f- ...

2011-04-21

279

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.

280

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

281

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

ERIC Educational Resources Information Center

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

Foster, Constance B.

1975-01-01

282

Significant Labor Decisions--An Analysis  

ERIC Educational Resources Information Center

Major labor cases decided during 1976 did not project a clear or simple path for further Constitutional and statutory interpretation, but the year's labor decisions did reveal a new willingness on the part of the U.S. Supreme Court to depart from earlier views of Constitutional law. (JT)

Polhemus, Graig E.

1977-01-01

283

A "Careers in Medicine Seminar" for Secondary School Students  

ERIC Educational Resources Information Center

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

Rodgers, Glen E.; And Others

1976-01-01

284

Current Developments in Federal Law Affecting Equal Employment Opportunity in Higher Education  

ERIC Educational Resources Information Center

Reviews issues and administrative regulations pertaining to affirmative action under Executive Orders 11246 and 11375, extension of Title VII of the Civil Rights Act of 1964 to academic and professional employment, and the Higher Education Ammendments of 1972 extending provisions of the Equal Pay Act of 1963. (JT)

Frohnmayer, David B.

1973-01-01

285

The Equal Pay Boondoggle  

ERIC Educational Resources Information Center

Problems of extending the Equal Pay Act to university faculty are examined in light of the complicated market forces and merit systems affecting faculty appointments and salaries. Solutions to the problem are suggested including guidelines for the Wage and Hour Division of the Department of Labor to use in identifying sex discrimination. (JT)

Lester, Richard A.

1975-01-01

286

US EPA, Pesticide Product Label, OLYMPIC CHLORINATED ...  

EPA Pesticide Factsheets

... ra"'- ,rr; a".J1Ij C3tTOOf"'6 pr:.t'"'(lI5 ')t ::> .. OIC ~ Do ~ con- :n."""dle ....aaet 'V¥' jf;("~r~ ')# 8O.J'prIfY' ""'~ t."'II5 t)f":Xl1JC1 'YIty ? ~~_ ~~ ~f ':" 18 iJtLr?r ...

2011-04-21

287

Effects of Toroidal Flow Profiles on Reversed Magnetic Shear Tokamak Equilibria  

Microsoft Academic Search

Magnetohydrodynamic (MHD) equilibria with toroidal flows are obtained numerically under conditions similar to those for some JT-60U discharges. In the presence of a toroidal flow, the magnetic-axis shift may be larger than that in the corresponding static equilibrium due to the centrifugal force of the flow. Since toroidal flow effects appear only through the pressure modification in the MHD equilibrium

Masaru Furukawa; Yuji Nakamura; Satoshi Hamaguchi; Masahiro Wakatani

2000-01-01

288

Studies on cooling by liquid helium in a large-scale cryopump of the neutral beam injector and its pumping performances of hydrogen gas and helium gas.  

National Technical Information Service (NTIS)

To develop a large-scale cryopump for hydrogen gas and helium gas in the JT-60 neutral beam injector (NBI), it is necessary to solve two critical issues, i,e., one is stable cooling of the cryopump composed of six cryopanels by liquid helium, and the othe...

K. Shibanuma

1993-01-01

289

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

290

A prospective comparison of nursing home acquired pneumonia with community acquired pneumonia  

Microsoft Academic Search

A prospective comparison of nursing home acquired pneumonia with community acquired pneumonia. W.S. Lim, J.T. Macfarlane. #ERS Journals Ltd 2001. ABSTRACT: Nursing home acquired pneumonia (NHAP) is thought to be clinically distinct from community acquired pneumonia (CAP). This observation, based on studies conducted mainly in North America, may not be relevant in countries with a different healthcare system. The authors

W. S. Lim; J. T. MacFarlane

2001-01-01

291

The Secularization of American Legal Education in the Nineteenth and Twentieth Centuries  

ERIC Educational Resources Information Center

Traces the secularlization of legal education, since the mid-19th century, contending that the results are a loss of scholarship in the neglect of the sources of the law and a deleterious effect on the attitudes of law students and teachers concerning their role in society and the nature of their profession. (JT)

Berman, Harold J.

1976-01-01

292

An Address to the Thirteenth Annual NACUA Conference 1973  

ERIC Educational Resources Information Center

The American Bar Association (ABA) president notes special moral (professional) responsibilities of college and university attorneys and calls attention to the ABA's Youth Education for Citizenship and its group legal service programs, and the upholding of preferential law school admission to minorities. (JT)

Smith, Chesterfield

1973-01-01

293

Optimal anaesthetic depth for LMA insertion  

PubMed Central

Purpose: A fixed dose of propofol administered rapidly can be insufficient or in excess resulting in airway complications and haemodynamic disturbances. This study is designed to assess whether loss of motor response to jaw thrust can be a reliable clinical indicator of anaesthetic depth for laryngeal mask airway (LMA) insertion. Methods: One hundred and twenty ASA I and II patients scheduled for general anaesthesia on day care basis were randomly allocated into two groups. Following pre-oxygenation, anaesthesia was induced to accomplish LMA insertion either with a 3 mg/kg propofol (Group CD, n=60) or in dose to abolish jaw thrust response (Group JT, n=60). Mean arterial pressure (MAP) and heart rate were continuously monitored while LMA insertion conditions were recorded using 6 variable, 3 point score. Results: 85% patients developed apnea in group CD when compared to 2% in group JT, P<0.0001. Despite similar insertion score, propofol consumption was significantly more in group CD when compared to group JT. More than 20% fall of MAP from baseline was noted in group CD after induction but there was no significant hypotension at any time in group JT. Conclusion: Loss of motor response to jaw thrust provides satisfactory LMA insertion conditions.

Krishnappa, Sudeep; Kundra, Pankaj

2011-01-01

294

Book Sales Total $3.5 Billion  

ERIC Educational Resources Information Center

|Association of American Publishers' figures on book sales are presented in tables and graphs: estimated book publishing industry sales for 1963, 1967, and 1971-74 by publishing category and estimated industry sales of textbooks, educational materials and standardized tests 1966-1974 with breakdown by educational level. (JT)|

College Store Journal, 1975

1975-01-01

295

US EPA, Pesticide Product Label, LACCO GRANULAR ...  

EPA Pesticide Factsheets

... if s\\\\':lIlo\\\\,('d, inhaled 0]' absol'1J('t\\ through :,kin Ill' eyes, Do not s\\\\'allll\\\\" in- hale or alll)\\\\' (ont:wl \\\\'ilh "kin, C~'C''; or clothing, \\\\':tsh thoroughly af1l>r ...

2011-04-14

296

US EPA, Pesticide Product Label, FORCE IV, 05/30/1990  

EPA Pesticide Factsheets

... Tn.h'l,t !If' ~'-'r Y1"-'" "1 {.~f- si"'~ rlr l~r().'i'l'-·" t. -, ' 'r ~"lJl~.!,r·1 'O'~.': J··~~j~-:t! ~tl .?? -.f \\'()I,~' t~I' l'Clt-';f": Y·->(1·l~r"~ ·1~1 !'""~lftr.j""ltc: , . \\ " ...

2011-04-14

297

US EPA, Pesticide Product Label, BYTECH BYSAN, 09/21 ...  

EPA Pesticide Factsheets

... ' ~ pr~o::1 "lt\\"t1"T"'1'~ pr~>:'t 9."'1,1 du....- lrod !h"'It(T'r.~ " I~ ~,~ ~I'I ~~':H ""'H 1'111 .~Jt ...

2011-04-14

298

Legal Rights to Reasonable Rules, Fair Grades, and Quality Courses  

ERIC Educational Resources Information Center

|The author examines the legal context of student consumerism and concludes that while recent court cases have granted more extensive constitutional rights to students in public colleges, for academic grievances, including the quality of institutional services, students receive little support from legal precedent. (Editor/JT)|

Mancuso, John H.

1976-01-01

299

US EPA, Pesticide Product Label, AZINPHOSMETHYL LC ...  

EPA Pesticide Factsheets

... '\\ r liT., " ,\\ I ... , l ~). 1\\ t. _, ,r.) ,'- I .. : .. J ' I~'JT /\\f,'dfJ{\\ 1 L~J CLUl ~lliJ(j ,'\\r·nJ Ir .. ,:. 1/\\ T! LY ','J, ~;:1 \\';11; 1 ~;lJI\\P /'d'~I) \\';/ T i~: Page 2. .? ? ...

2011-04-21

300

US EPA, Pesticide Product Label, SWIFT TOXAPHENE V6E ...  

EPA Pesticide Factsheets

... lI~d rlJ',',I~t 11111" ,Ippl'{ al lh,: ';111, f)f ;). ~( V ' pl~lt,-; I? 10 '} ~)(UII/!'; of a/;IlJ;11 to,CI[Jt.':IH'1 P'" ;1' I.: IJI:P"'Irjlriil 'n tll(~ ',Ill: I,f til" [;I;lnl', DfJ n": ;Wpl ...

2011-04-14

301

Treatment of Severe Obstructive Sleep Apnea Syndrome with a Chinstrap  

PubMed Central

A chinstrap alone improved severe obstructive sleep apnea as well as or better than the use of CPAP. Citation: Vorona RD; Ware JC; Sinacori JT; Ford ML; Cross JP. Treatment of severe obstructive sleep apnea syndrome with a chinstrap. J Clin Sleep Med 2007;3(7):729–730.

Vorona, Robert D.; Ware, J. Catesby; Sinacori, John T.; Ford, Melvin L.; Cross, J. Parker

2007-01-01

302

University of Missouri-Columbia School of Medicine Postsophomore Pathology Fellowship Program  

ERIC Educational Resources Information Center

Since 1959 selected sophomore pathology students have been offered a fellowship to work as junior faculty members for one year between their second and third years in medical school. A recent evaluation of that program is reported in which objective and subjective measures indicate program goals are being attained. (JT)

Longo, Dan L.; And Others

1976-01-01

303

Heat removal  

Microsoft Academic Search

Studies on heat-removal technology in fusion reactors are being made at laboratories of universities and at JAERI. Activities at universities involve fundamental studies related to fluid flow and heat transfer in the MCF as well as in the ICF blanket. Activities at the JAERI involve experimental heat technology developments in the JT-60 program and fusion reactor development program. A figure

A. Inove; H. Madarame; T. Tone

1983-01-01

304

US EPA, Pesticide Product Label, NUDRIN 2.4 INSECTICIDE ...  

EPA Pesticide Factsheets

... 1 .... atcr l...r 3;'pll.lh'Jt"l t1, CO".C'\\!, \\1\\<11 !t". t, '.f! ~ ,·1,'·1 s: Il( ('(lu," rr,' U!I'-' "'l:, " ll..l"'" '.1.,'; :1' I·nr," 'II' _,! U'l ') "', n:\\.' p:.l'·::~Js ~ '"'l' i '(U[)HIf~ ~ 4 Ir ...

2011-04-13

305

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...

306

Homocysteine as a risk factor for CVD mortality in men with other CVD risk factors: the Kuopio Ischaemic Heart Disease Risk Factor (KIHD) Study  

Microsoft Academic Search

Abstract. Virtanen JK, Voutilainen S, Alfthan G, Korhonen MJ, Rissanen TH, Mursu J, Kaplan GA, Salonen JT (University of Kuopio, Kuopio; National Public Health Institute, Helsinki, Finland; University of Michigan, Ann Arbor, USA; and Oy Jurilab Ltd, Kuopio, Finland). Homocysteine as a risk factor for CVD mortality in men,with other CVD risk factors: the Kuopio Ischaemic,Heart Disease Risk Factor (KIHD)

J. K. V IRTANEN; T. H. R ISSANEN

2005-01-01

307

Solid State Oxygen Compressor for Joule - Thompson Cryocoolers.  

National Technical Information Service (NTIS)

This report summarizes the work performed in the original Phase II Program and the results of the ARPA sponsored program. Prototypes of the Honey Comb Oxygen Generators (ARPA) as Solid State Oxygen Compressors for the J-T (Joule-Thomson) Cryocoolers were ...

W. N. Lawless

1997-01-01

308

Medical Student Assessment of Videocassettes in Psychiatry  

ERIC Educational Resources Information Center

Five medical students viewed and criticized 11 videocassettes in "The Electronic Textbook of Psychiatry and Neurology." Brief summaries of the resulting critiques are presented here along with evaluation of videocassettes as an educational medium and the conclusion that videocassettes are useful for teaching medical students. (JT)

Heidel, Stephen; And Others

1975-01-01

309

US EPA, Pesticide Product Label, AGWAY CROP SPRAY-1 ...  

EPA Pesticide Factsheets

... INSECTICIDE ":·~.l .... ~tH\\t~ '. ~~1 ".,.aJ)' tJ':,t, fer ..... ... ".~' . t,Jt(-tI ,,. ?? f't ..... to .,.,_ .~ll"''' l~ h ,"","1 .....t.!~~Ur.).I."\\" " ___ ",1 tf t-OC'!I"tJ .. ...

2011-04-21

310

Forward velocity effects on fan noise and the suppression characteristics of advanced inlets as measured in the NASA Ames 40 by 80 foot wind tunnel: Acoustic data report  

Microsoft Academic Search

Forward velocity effects on the forward radiated fan noise and on the suppression characteristics of three advanced inlets relative to a baseline cylindrical inlet were measured in a wind tunnel. A modified JT15D turbofan engine in a quiet nacelle was the source of fan noise; the advanced inlets were a CTOL hybrid inlet, an STOL hybrid inlet, and a treated

M. T. Moore

1981-01-01

311

US EPA, Pesticide Product Label, ROACH NO MORE, 08/21 ...  

EPA Pesticide Factsheets

... <..IOU ,', , q ?. , I,,· 1,'./, tir,IW'-'" 11\\ ' lJptH) dPd J'I 'I., ' , Ir]il 1.1 " " , AI."ly III kill to,-" ~Inio.. "·1 t. ,lfi dlt~,j·.> .lfl,1 ,)Iht:, ,II I "~~.tJt ?? <" . J 'I 'I' ...

2011-04-21

312

Spin-Orbit Interaction and Jahn-Teller Transition in Bimetallic Oxalates  

SciTech Connect

The C3-symmetric crystal-field potential in the Fe(II)Fe(III) bimetallic oxalates splits the L = 2 Fe(II) multiplet into two doublets and one singlet. In compounds that exhibit magnetic compensation, one of the doublets lies lowest in energy and carries an average orbital angular momentum Lcf z that exceeds a threshold value of roughly 0.25. In a range of Lcf z , a Jahn-Teller (JT) distortion increases the energy splitting of the low-lying doublet and breaks the C3 symmetry of the bimetallic planes around the ferrimagnetic transition temperature. Due to the competition with the spin-orbit coupling, the JT distortion disappears at low temperatures in compounds that display magnetic compensation. A comparison with recent measurements provides strong evidence for this inverse, low-temperature JT transition. The size of the JT distortion is estimated using first-principles calculations, which suggest that the long-range ordering of smaller, non-C3-symmetric organic cations can eliminate magnetic compensation. Keywords: Jahn-Teller distortion; Spin-orbit interaction; Crystal fields; Bimetallic oxalates

Fishman, Randy Scott [ORNL; Okamoto, Satoshi [ORNL; Reboredo, Fernando A [ORNL

2009-01-01

313

Having a Graduate Seminar "With" Rather Than "From"  

ERIC Educational Resources Information Center

The educational objectives and techniques for the graduate seminar are outlined and illustrated with material from a successful seminar on The World of John Donne. Included is discussion of selecting an appropriate topic, use of guest lecturers, students working as a team, and the teacher's role. Emphasis is on shared research. (JT)

Morris, William E.

1975-01-01

314

Effects of Shafranov Shift on the Drift and Kinetic Ballooning Modes in Negative Shear Tokamaks  

Microsoft Academic Search

Effects of Shafranov shift (Delta^') on the drift type modes and kinetic ballooning mode (KBM) in high performance negative shear tokamak discharges have been investigated with a kinetic shooting code. Discharge parameters similar to those in the Internal Transport Barrier in the JT-60U tokamak with a large ballooning parameter (alpha ~= 3 ~ 5, s ~= -0.5 and Delta^' ~=

A. Hirose; M. Yamagiwa

1997-01-01

315

Policy-Making in a Negotiating Society  

ERIC Educational Resources Information Center

A national disenchantment with knowledge, which sets up a contest between reason and mindlessness, and a strong tilt in the direction of conservative fiscal policy are cited as cause for those seeking support for science to take the initiative and negotiate a workable policy future. (JT)

Carey, William D.

1976-01-01

316

US EPA, Pesticide Product Label, CHEM TRIM GRASS AND ...  

EPA Pesticide Factsheets

Page 1. . ~ , ph,ti tdXIC ;Jf()jl{~rtlt·l.JI··'; .It .1, dflti ~\\.d fdLL.JIIt. I t I~ ... dilil'l.l'Ylld. iJr·· t)lJt'll!ll'~! !fl V()t ~:~: ll\\ t·. "I. C ". l' :.' I .. I ~ ~ .'\\ _:, : ) 'r l' I .? .' . ...

2011-04-19

317

The Several Ages of Learning  

ERIC Educational Resources Information Center

Examines the various stages of human development (as outlined by Erik Erikson and others) with their psychological stresses of recurring crises of identity and expectation and explores some of the implications for education's best serving human needs. Focuses on early childhood, late adolescence, middle age, and old age. (JT)

Bailey, Stephen

1976-01-01

318

The Campus and the Meaning of Relevance  

ERIC Educational Resources Information Center

|A reconstruction of colleges and universities to develop valid theory with which to direct the course of social action is proposed: the breakdown of compartmentalization between and within disciplines, casting off the myths of "value neutrality" and science as "descriptive," and the integration of theory and practice. (JT)|

Tarcher, Martin

1975-01-01

319

The Scientific Prototype, a Proposed Next Step for the American MFE Program  

NASA Astrophysics Data System (ADS)

The "Scientific Prototype" is a tokamak about the size and power of JET, TFTR or JT-60, but which runs steady state in DT and breeds its own tritium. This paper, more in the spirit of an editorial than a scientific research publication, argues that it is the only reasonable option for the American MFE program.

Manheimer, Wallace

2013-08-01

320

US EPA, Pesticide Product Label, M-GARD W510, 01/04/1993  

EPA Pesticide Factsheets

... Fir t~. tl.tt., It "If,1 ret ... 'ICI, il ... 4 ,reflcts, t~. Me.' ".,1' ?? I,n,'!" suld ., 'i,,. ?. nt".ti., th ... SlthU. I't-CMI)U510 is 11 , .. lsiril.Jt ( .. ( . tntl If CI".r N,Uhllh "ih.'. , . ...

2011-04-21

321

US EPA, Pesticide Product Label, BONIDE INSECT BAIT ...  

EPA Pesticide Factsheets

... r .... : 1 , " , , : r'(hnC'l--' wi th lo·h 1 c!irl'c ti('n~~, thl,;\\' 'n·[;:; 1 'I ; . "Il'l'(,t t('·ps, 1'1'''-\\ vini'::, ;ur:lt' t'l.Tt t.(,p.:,> r'n j,t' . i J, 1 , : t 1 1'. I 1 . 1. " \\" , ...

2011-04-13

322

Ratchet transport with subdiffusion  

NASA Astrophysics Data System (ADS)

We introduce a model which combines the subdiffusive dynamics and the ratchet effect. Using a subordination ideology, we show that the resulting directed transport is sublinear, < x(t)>?Jt?, ?< 1. The proposed model may be relevant to a phenomenon of saltatory microbiological motility.

Denisov, S.

2008-04-01

323

Highlights from the Jet Stability Programme  

Microsoft Academic Search

An overview of the JET stability programme is given, highlighting the latest results: New halo current detectors confirm ITER scaling assumptions. Runaway electrons appear above 2T, as in JT60, and are dominantly due to avalanche processes. Disruption mitigation with neutral point operation and impurity puffing has been demonstrated. Scaling of NTM metastable thresholds and physics of FIR-NTM mitigation have been

S. D. Pinches; R. J. Buttery; T. C. Hender

2003-01-01

324

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

Microsoft Academic Search

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

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

1999-01-01

325

Joule-Thomson cryocooler for space applications  

Microsoft Academic Search

A J-T cryocooler is being developed for space applications. It is under laboratory testing and will be flight-tested aboard the Space Shuttle in middle to late 1997. A seal-ability study confirmed that the EDM design is robust and can accommodate a wide range of heat loads while maintaining the development heritage.

R. Levenduski; R. Scarlotti

1996-01-01

326

US EPA, Pesticide Product Label, SBP-1382/BIOALLETHRIN ...  

EPA Pesticide Factsheets

Page 1. , 1 --+~~ SCP-1302®/CRGAlILEtl't~~n[~J ~~J~t~~Tn'~~r.fi]~ ~@r~l\\;fi:~l'ir:e~~l: 31 ~'o-19.5% "'. f!'II "-~ r ., r. n" t'\\ ? ! . l ...

2011-04-14

327

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

328

US EPA, Pesticide Product Label, 10% QUAT RINSE, 09/08 ...  

EPA Pesticide Factsheets

... c·; 40C\\,~' ~L''\\.r (!,rr-?? !n,.' (·n~~! ammor" .... cr "Jr .. ... iJ!!cr; ,,1 \\', il'.:r T ..... u!",r. <.': t,.· <>J[)t (.c _ .. r, v'·' r~:,'. t,'~~, JD:-,: f1 ,'.':Jtt:'. ...

2011-04-21

329

Teachers and the First Amendment: Academic Freedom and Exhaustion of Administrative Remedies under 42 U.S.C. Section 1983  

ERIC Educational Resources Information Center

The difficulties of defining academic freedom are noted in an exploration of recent judicial attempts to define the scope of teachers' First Amendment rights in the area of intramural speech. The exhaustion of administrative remedies in cases brought under 42 U.S.C. section 1983 (a basic statute in such cases) is also discussed. (JT)

Moskowitz, Ivor R.; Casagrande, Richard E.

1975-01-01

330

US EPA, Pesticide Product Label, CLEAN CROP MCP AMINE ...  

EPA Pesticide Factsheets

... "ql:l", ',J:' " {' I"j-. " .: P.'CP "".·,jl,~ 11('1 Of> u .... I'., .. t'; ':' i''' '- _ CO!k'.''l I(""';i!l't'~ "':jt;\\." 0·.1.".· . 1'." bf"ins IC'::I.kCl' "t'I',j"" U., f.!.I' .\\ '-I '.1. " 0 ...

2011-04-21

331

Titanium Honeycomb Acoustic Lining Structural and Thermal Test Report.  

National Technical Information Service (NTIS)

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. T...

D. Joynes J. P. Balut

1974-01-01

332

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

ERIC Educational Resources Information Center

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

Conzelman, Gaylord M.; And Others

1975-01-01

333

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

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

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

334

SOURCE SAMPLING FINE PARTICULATE MATTER: WOOD-FIRED INDUSTRIAL BOILER: PROJECT REPORT/SUMMARY  

EPA Science Inventory

NRMRL-RTP-229 Dayton, D.P., and Bursey, J.T. Source Sampling Fine Particulate Matter: Wood-fired Industrial Boiler. EPA-600/R- 01/106, Available: NTIS.10/29/2001 The report provides a profile for a wood-fired industrial boiler equipped with a multistage electrostatic precipitato...

335

US EPA, Pesticide Product Label, ERADICANE 7.5-IG ...  

EPA Pesticide Factsheets

... ( ';1) -.' JC,·-iiJct l .? '. . f:.' : I .: I . ~q 1.1 i ) .!., I·Jt;-:- linq c:irtn·:-:p!.". j i .->tc i f.1-O.lU{;t EuJ.· sllil .. ,'!nt: 1' .. ,, 1" J .; t. i()nl :.1 (:ti .. ,n ~'L:) ('" s:.·~: cil ...

2011-04-19

336

The Impact of Geduldig v. Aiello on the EEOC Guidelines on Sex Discrimination  

ERIC Educational Resources Information Center

|From an analysis of criteria applicable to sex discrimination under the Fourteenth Amendment and the Civil Rights Act of 1964, Title VII, the author concludes that although the Fourteenth Amendment may not require standards such as those in the Equal Employment Opportunity Commission guidelines, neither does it prohibit them. (JT)|

Bunnell, Rhoda

1975-01-01

337

1974-1975 Annual Survey of Labor Relations and Employment Discrimination Law  

ERIC Educational Resources Information Center

|Major headings in this review of 1974-75 labor relations and employment discrimination law include Unfair Labor Practices, Arbitration, Seniority, Sex Discrimination, Affirmative Action Under Title VII, Equal Employment Opportunity Commission Enforcement Powers under Section 706, and Federal Employment--Judicial Application of Section 717. (JT)|

Lombardi, Robert Philip; And Others

1975-01-01

338

Tenure and Title VII  

ERIC Educational Resources Information Center

|The concept of academic tenure is examined in relationship to charges that it may violate Title VII of the Civil Rights Act regarding equal opportunities for women and minorities. The author finds no reason why a well-administered award tenure system utilizing collegial judgment is inconsistent with Title VII. (JT)|

LaNoue, George R.

1974-01-01

339

Alexander v. Gardner-Denver: A Threat to Title VII Rights  

ERIC Educational Resources Information Center

|An examination of the decision on the rights of an employee, who has unsuccessfully pursued a race or sex discrimination claim through arbitration, to "relitigate" the claim under Title VII, Civil Rights Act of 1964. Conclusion: the decision endangers Title VII rights by granting too much weight to prior arbitration awards. (JT)|

Richards, Richard F.

1975-01-01

340

Plant Seniority and Minority Employees: Title VII's Effect on Layoffs  

ERIC Educational Resources Information Center

|In presenting ways plant seniority provisions regarding layoffs should be modified to accomplish the policies of Title VII of the Civil Rights Act of 1964 (to end racial and sexual discrimination in employment practices), the author analyzes leading cases to demonstrate faulty interpretations currently used and suggests alternative remedies. (JT)|

Fine, Howard F.

1975-01-01

341

Treesearch - Forest Service Research & Development  

Treesearch

Sep 21, 2012... Koehn, Anita C.; Roberds, James H.; Doudrick, Robert L. 2003, -- ... He, Rechun; Hall, Daniel B.; Clark, Alexander III; Daniels, Richard F. 2007, --. Variation of paper curl due to fiber orientation, Decker, J.T.; Khaja, A.A.; ...

342

Intraoccupational Veterinary Specialties: Career Trends and Contingencies Among Students and Practitioners  

ERIC Educational Resources Information Center

|A study to identify factors affecting individuals' decisions to pursue small- or large-animal veterinary practice showed that area of childhood residence, perceived (but not actual) income differentials, job travel demands, and perceived professional image and prestige affect the increasing shift from large- to small- animal practice. (JT)|

Snizek William E.; Bryant, Clifton D.

1975-01-01

343

An Instrument for the Identification of Core Curriculum in the Discipline of Gynaecology  

ERIC Educational Resources Information Center

Describes an instrument designed to identify with considerable agreement appropriate knowledge, skills, and attitudes for gynecology curriculum, relate it to other curriculum content, and determine where it should appear in the curriculum. Focus is on clinical problems to be solved and the underlying processes. (JT)

Taylor, P. J.

1976-01-01

344

A Model for Horizontal Power Sharing and Participation in University Decision-Making  

ERIC Educational Resources Information Center

|Develops a 5-state model for decision-making that incorporates a faculty-opinion survey permitting almost universal expressions of opinion and preference on a complex administrative decision and generating alternative policies for decision-makers. It was successfully employed to reexamine the role of dean in a large university. (Editor/JT)|

Pollay, Richard W.; And Others

1976-01-01

345

Dispersion of ventricular repolarization and arrhythmic cardiac death in coronary artery disease.  

PubMed

In a recent prospective study of myocardial ischemia, arrhythmic cardiac death occurred in 17 of 936 patients (2%) during a 2-year follow-up after acute myocardial infarction or unstable angina. Dispersion of ventricular repolarization was evaluated on the 12-lead electrocardiogram at enrollment in 17 patients who subsequently died of cardiac arrhythmia and in 51 matched survivors. The aim of this study was to evaluate the relation between various measurements of dispersion of repolarization and subsequent arrhythmic cardiac death, and to determine if dispersion of repolarization makes an independent contribution to the risk of arrhythmic cardiac death. Ventricular depolarization quantitated in terms of mean QRS (QRS-m) duration, and ventricular repolarization quantitated in terms of mean (m), maximal-minimal dispersion (d), standard deviation (s), and coefficient of variation (cv) of QT and JT intervals, were determined. Univariate analyses revealed that 2 standard electrocardiographic parameters, QRS-m and QT-m, and 3 dispersion variables, JT-d, JT-s, and JTc-d, were associated with arrhythmic cardiac death (p < 0.01). Multivariate analyses revealed that the combination of the dispersion parameter (JT-d, JT-s, or JTc-d) and QRS-m made an independent contribution to the risk of arrhythmic cardiac death. The findings highlight the importance of both delayed depolarization and heterogenous repolarization as risk factors for arrhythmic cardiac death. Thus, increased dispersion of repolarization is associated with an elevated likelihood of arrhythmic cardiac death. Prolonged QRS duration and increased dispersion of repolarization make independent contributions to the risk of arrhythmic cardiac death in patients with coronary artery disease. PMID:8074036

Zareba, W; Moss, A J; le Cessie, S

1994-09-15

346

?-Endorphin, Met-enkephalin and corresponding opioid receptors within synovium of patients with joint trauma, osteoarthritis and rheumatoid arthritis  

PubMed Central

Objective Intra?articularly applied opioid agonists or antagonists modulate pain after knee surgery and in chronic arthritis. Therefore, the expression of ??endorphin (END), Met?enkephalin (ENK), and ? and ? opioid receptors (ORs) within synovium of patients with joint trauma (JT), osteoarthritis (OA) and rheumatoid arthritis (RA) were examined. Methods Synovial samples were subjected to double immunohistochemical analysis of opioid peptides with immune cell markers, and of ORs with the neuronal markers calcitonin gene?related peptide (CGRP) and tyrosine hydroxylase (TH). Results END and ENK were expressed by macrophage?like (CD68+) and fibroblast?like (CD68?) cells within synovial lining layers of all disorders. In the sublining layers, END and ENK were mostly expressed by granulocytes in patients with JT, and by macrophages/monocytes, lymphocytes and plasma cells in those with OA and RA. Overall, END? and ENK?immunoreactive (IR) cells were more abundant in patients with RA than in those with OA and JT. ORs were found on nerve fibres and immune cells in all patients. OR?IR nerve fibres were significantly more abundant in patients with RA than in those with OA and JT. ?ORs and ?ORs were coexpressed with CGRP but not with TH. Conclusions Parallel to the severity of inflammation, END and ENK in immune cells and their receptors on sensory nerve terminals are more abundant in patients with RA than in those with JT and OA. These findings are consistent with the notion that, with prolonged and enhanced inflammation, the immune and peripheral nervous systems upregulate sensory nerves expressing ORs and their ligands to counterbalance pain and inflammation.

Mousa, Shaaban A; Straub, Rainer H; Schafer, Michael; Stein, Christoph

2007-01-01

347

The origin of the lattice distortion and its pressure dependence in 3d monoxides  

NASA Astrophysics Data System (ADS)

3d transition metal oxides below the Neel temperature suffer distortions from the cubic rocksalt structure: trigonal for MnO, FeO, and NiO, and tetragonal for CoO. The distortion is weak for MnO and NiO (full t_2g band), and strong (and increasing with presure) for FeO and CoO, which suggests a mechanism similar to the Jahn-Teller (JT) effect. The signs of the distortions, however, do not fit the conventional JT picture, and the distortions appear only in antiferromagnetic state; it was suggested therefore that magnetic order influence the distortion via spin-orbit coupling. On the other hand, non-JT ions Mn and Ni still have some distortion; many believe that it is due to exchange magnetostriction. We performed numerical study (and found good agreement with the experiment at normal and high pressures) of the equilibrium crystal structure of several 3d-oxides within plain LDA, GGA, and LDA+U (to account for Hubbard repulsion). An analysis of our results suggests that the main reason for distortion is dd? bonding between metal ions, much alike conventional covalent bonding. The change of the dd? hopping due to distortion provides changes in the energy of the d-states, similar to the classical cooperative JT effect. We were able to explain all essential trends in the structural behaviour of the investigated materials. The main difference of this mechanism from the usual JT effect is that it is due to covalent metal-metal bonding and not to metal-oxygen bonding.

Mazin, I. I.; Cohen, R. E.; Liechtenstein, A. I.

1996-03-01

348

Volume contraction and resistivity drop at the Jahn-Teller transition in La{sub 1-x}Ca{sub x}MnO{sub 3}  

SciTech Connect

We have investigated the Jahn-Teller transition accompanied by orbital order-disorder transition in La{sub 1-x}Ca{sub x}MnO{sub 3} by high temperature x-ray powder diffraction with synchrotron radiation and resistivity measurements. The unit cell volume of LaMnO{sub 3} decreases with increasing temperature in a narrow temperature range below T{sub JT}{approx_equal}750 K and then undergoes a volume collapse at T{sub JT}. The transition is first order. Similar behavior is also obtained in Ca-doped La{sub 1-x}Ca{sub x}MnO{sub 3} for x=0.025 and 0.075. The amount of volume collapse, however, decreases with the doping and also the first order discontinuous transition crosses over to a quasi-continuous transition with doping. We interpret the volume contraction at the transition is due to a more efficient packing of the MnO{sub 6} octahedra in the orbitally liquid state and the crossover from the discontinuous to the quasi-continuous transition is due to the change in the anharmonic coupling parameter with the hole doping. The resistivity of LaMnO{sub 3} decreases as a function of temperature and then shows abrupt drop at T{sub JT} becoming almost temperature independent at higher temperature. The resistivity of La{sub 1-x}Ca{sub x}MnO{sub 3} also decreases at T{sub JT} but the abrupt drop becomes smeared out at higher doping. The similar behavior of the unit cell volume and the resistivity at the Jahn-Teller transition suggests that the volume contraction at T{sub JT} causes delocalization of e{sub g} electrons.

Chatterji, Tapan [Institut Laue-Langevin, BP 156, 38042 Grenoble Cedex 9 (France); Riley, D. [School of Engineering, University of Newcastle, University Drive, Callaghan, NSW 2308 (Australia); Fauth, F. [European Synchrotron Radiation Research Facility, BP 220, 38043 Grenoble Cedex (France); Mandal, P.; Ghosh, B. [Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Calcutta 700 064 (India)

2006-03-01

349

Influence of performance level on anaerobic power and body composition in elite male judoists.  

PubMed

This study examined the relationship between 30-second anaerobic power and body composition by performance level in elite Judoists. During a 3-month period, 10 male Korean Judo national team athletes (NT), 26 male university varsity team athletes (VT), and 28 male junior varsity team athletes (JT) were assessed for 30-second anaerobic power and body composition at the Youngin University. Anaerobic power was measured using a 30-second Wingate test. Body composition was assessed via bioelectric impedance analysis in standardized conditions using BioSpace (Korean)-specific prediction formulas. All testing occurred at the beginning of the winter nonseason period but excluded a brief weight-loss period before the competition phase. Anaerobic power measures were significantly greater (p < 0.05) in NT and VT than in JT. Fat-free mass (FFM), muscle mass (MM), and total body water in JT were also greater than in VT and JT (p < 0.05). Muscle mass in VT was significantly lower than in NT (p < 0.05). Fat-free mass in NT was strongly correlated to mean and peak anaerobic power (r = 0.77, p = 0.009; r = 0.87, p < 0.001, respectively). Varsity team athletes also indicated a moderate association between FFM and peak and mean anaerobic power (r = 0.63, p < 0.001; r = 0.48, p = 0.013, respectively). However, relationship between FFM and anaerobic power was not statistically significantly correlated in JT (r = 0.14, p = 0.470; r = 0.23, p = 0.232, separately). In conclusion, our data indicated that anaerobic power is closely correlated with increase in FFM and MM and was different dependent among performance levels. Further research in the field is warranted to elucidate the Judo-specific relationship between FFM and performance. PMID:20975602

Kim, Jongkyu; Cho, Hyun-Chul; Jung, Han-Sang; Yoon, Jong-Dae

2011-05-01

350

Time-Dependent Multiconfiguration Theory and Its Application to Ultrafast Electronic Dynamics of Molecules in an Intense Laser Field  

NASA Astrophysics Data System (ADS)

We outlined a time-dependent multiconfiguration theory todescribe electronic dynamics of molecules, where the many-electron wave function at time t, ?(t), is expanded in terms of different electron configurations ?_I(t) composed of time-dependent one-electron orbitals (spin-orbitals) as ?(t) = sum_I C_I(t) ?_I(t). The equations of motion (EOMs) for spin-orbitals in coordinate representation are derived together with the EOMs for configuration interaction coefficients C_I(t). As an example of application to molecules, we presented the results of investigation of the ionization dynamics of H_2 interacting with a near-infrared intense laser filed. By extending the concept of Hartree-Fock orbital energy to multiconfiguration theory, we newly introduced the ``molecular orbital energies" of natural spin-orbitals (NSOs) { j } of a many-electron system and defined the orbital potentials bar{?}_j (t) and correlation energies V^c_j(t) of NSOs. The total energy E(t) is decomposed into individual components as E(t) = sum_j ?_j(t) bar{?}_j (t) as in thermodynamics, where ?_j(t) are the occupation numbers of { j }. We proved that this type of partition of the total energy is interpreted as the time-dependent chemical potential for the two-electron system. The newly defined correlation energy V^c_j(t) associated with the {j}th NSO, involved in bar{?}_j (t), reflects dynamical electron correlations on the attosecond timescale. We also compared the energy ?_j(t) directly supplied by the applied field with the net energy gain ?bar{{?}}_j(t) for respective natural orbitals. The responses of natural orbitals can be classified into three: ?bar{{?}}_j(t) = ?_j(t) (spectator orbital); ?bar{{?}}_j(t) < ?_j(t) (energy donor orbital); and ?bar{{?}}_j(t) > ?_j(t) (energy acceptor orbital). We found that ionization of H_2 most efficiently occurs from a time-developing energy acceptor NSO 2?_g for the case of the present applied field. We concluded that energy acceptor natural orbitals play a key role in ionization processes.

Kato, T.; Oyamada, T.; Kono, H.; Koseki, S.

351

Determination of neutrino mass from tritium beta decay  

SciTech Connect

The most sensitive way to determine the neutrino mass scale without further assumptions is to measure the shape of a tritium beta spectrum near its endpoint. Tritium is the nucleus of choice because of its low endpoint energy, super allowed decay, simple nuclear properties and simple atomic structure. Tritium beta decay experiments have been performed for more than 60 years yielding in an upper limit of the electron neutrino mass of 2 eV/c{sup 2}. The Karlsruhe Tritium Neutrino experiment (KATRIN) will improve the sensitivity on the neutrino mass by another order of magnitude. This article gives a short survey of 6 decades of tritium beta decay experiments and discusses the future steps. (authors)

Bornschein, B. [Forschungszentrum Karlsruhe, Inst. for Technical Physics, Tritium Laboratory Karlsruhe, P.O. Box 3640, D-76021 Karlsruhe (Germany)

2008-07-15

352

Measuring mass of neutrinos with ?-decays of tritium and rhenium  

NASA Astrophysics Data System (ADS)

Already long time ago the shape of the electron spectrum in ?-decays of 3H and 187Re has been recognized as an important tool for understanding of neutrino masses. The sensitivity of KATRIN (in preparation, tritium ?-decay) and the MARE (under consideration, 187Re ?-decay) experiments to neutrino mass will reach the sub eV domain. In view of this experimental progress there is a request for a highly accurate theoretical description of the electron endpoint spectra. By taking the advantage of the elementary particle treatment of 3H and 3He the relativistic form for ?-decay endpoint spectrum of tritium is obtained by taking into account also the effect of nuclear recoil. Further, the currently unknown shape of the electron spectrum for the ?-decay of 187Re is presented. It is found that the first forbidden 187Re(5/2+)-->187Os(1/2-)?-decay transition is accompanied with emission of mostly p3/2-state electrons.

Dvornický, R.; Šimkovic, F.

2009-11-01

353

Li+ Intercalation of Manganese Ferrocyanide as Investigated by In situ Valence-Differential Absorption Spectroscopy  

NASA Astrophysics Data System (ADS)

Manganese ferrocyanide is a promising cathode material for lithium-ion secondary battery (LIB) with a high discharge rate (v). The open-circuit-voltage (OCV) discharge curve for LixMn[Fe(CN)6]0.813.0H2O films consists of plateaus I and II, which are due to the reduction of Mn3+ and Fe3+, respectively. Systematic investigations of the discharge curve revealed that an extra plateau, plateau III, appears between plateaus I and II. In situ valence-differential (VD) absorption spectroscopy indicates that the reduction sites in plateaus I and III are Mn3+. We ascribed plateaus I and III to the reduction of the Jahn--Teller (JT)-released and JT-distorted Mn3+N6 octahedra, respectively.

Moritomo, Yutaka; Wakaume, Kazuma; Takachi, Masamitsu; Zhu, XuHao; Kamioka, Hyato

2013-09-01

354

Ring chromosome 18q and jumping translocation 18p in an adult male with hypergonadotrophic hypogonadism.  

PubMed

Constitutional jumping translocations (JT) are rare, especially in phenotypically normal individuals. We report on an adult male with partial hypogonadism as the sole phenotypic abnormality with an unusual chromosome abnormality. In this patient, centric fission of chromosome 18 lead to formation of a ring 18q chromosome, while 18p formed a JT through centromere-telomere fusion with chromosome 8q (66%) or 20q (13%). In 21% of cells, the 18p fragment was missing. Fluorescent in situ hybridization revealed the presence of interstitial telomeres at the junction site of the fusion and unequal distribution of the alphoid sequences through the centric fission, leaving a small, yet functional centromere within the ring. We discuss the phenotype of the patient in light of this unusual karyotype. PMID:15266611

Zahed, L; Oreibi, G; Azar, C; Salti, I

2004-08-15

355

Enzymatic synthesis of unique sialyloligosaccharides using marine bacterial alpha-(2-->3)- and alpha-(2-->6)-sialyltransferases.  

PubMed

We investigated the acceptor substrate specificities of marine bacterial alpha-(2-->3)-sialyltransferase cloned from Photobacterium sp. JT-ISH-224 and alpha-(2-->6)-sialyltransferase cloned from Photobacterium damselae JT0160 using several saccharides as acceptor substrates. After purifying the enzymatic reaction products, we confirmed their structure by NMR spectroscopy. The alpha-(2-->3)-sialyltransferase transferred N-acetylneuraminic acid (Neu5Ac) from cytidine 5'-monophospho-N-acetylneuraminic acid (CMP-Neu5Ac) to the beta-anomeric hydroxyl groups of mannose (Man) and alpha-Manp-(1-->6)-Manp, and alpha-(2-->6)-sialyltransferase transferred N-acetylneuraminic acid to the 6-OH groups of the non-reducing end galactose residues in beta-Galp-(1-->3)-GlcpNAc and beta-Galp-(1-->6)-GlcpNAc. PMID:20413108

Mine, Toshiki; Miyazaki, Tatsuo; Kajiwara, Hitomi; Naito, Kenta; Ajisaka, Katsumi; Yamamoto, Takeshi

2010-04-03

356

Activation Energy of Oxygen Vacancy Diffusion of Yttria-Stabilized-Zirconia Thin Film Determined from DC Current Measurements below 150 °C  

NASA Astrophysics Data System (ADS)

The current density versus time (J-t) characteristics of yttria-stabilized-zirconia (YSZ) films on Si(001) below 150 °C were measured. By the application of a negative voltage up to 20 V to the aluminum top electrode, a current peak was observed. The peak evolution was considered on the basis of the space-charge-limited current transient of oxygen vacancy (model-1), and the modulation of electronic conductivity upon oxygen vacancy redistribution (model-2). From the point of view of the activation energy and the relative dielectric constant estimation, model-2 gave a more plausible value. It was also observed, based on J-t measurements, that Nb-doping causes the suppression of oxygen vacancies.

Wakiya, Naoki; Tajiri, Naoya; Kiguchi, Takanori; Mizutani, Nobuyasu; Cross, Jeffrey S.; Shinozaki, Kazuo

2006-06-01

357

Hybrid thermal-field emission of ZnO nanowires  

NASA Astrophysics Data System (ADS)

The electron emission properties of an array of ZnO nanowires were studied in the temperature range of 300-473 K. An almost doubling of the current density at 473 K under an electric field of 8 V/?m (j(T=473 K) = 190 ?A/cm2, j(T=300 K) = 114 ?A/cm2) was observed together with a reduction of the turn-on field from 552 V/?m to 482 V/?m. Theoretical model that combines the thermal-field emission for high electric field and the Schottky emission for the low field can satisfactorily account for temperature dependence of current at low as well as at high applied bias. The obtained effect is particularly appealing for the application in micro-gun for THz vacuum tubes.

Ulisse, Giacomo; Brunetti, Francesca; Vomiero, Alberto; Natile, Marta M.; Sberveglieri, Giorgio; di Carlo, Aldo

2011-12-01

358

Color centers vs electrolytes for Si-based porous anodic alumina  

NASA Astrophysics Data System (ADS)

Anodic oxidation of Al film on silicon substrate in three different electrolytes is investigated through j-t curves and photoluminescence (PL) of the grown porous anodic alumina (PAA) under same voltage. Their growth is analyzed with three typical stages according to j-t curve. The influence of the electrolyte on color centers is shown through comparison of the PL spectra of Si-based PAA fabricated in different electrolytes. From sulfuric, oxalic to phosphoric acids, The PL shows blueshift behavior with different electrolytes due to mechanical stress and concentration of defect centers, while the change of PL intensity reduced for decreasing of the contrast across barrier layer, which is helpful to understand PL mechanism and growth mechanism of porous anodic alumina.

Mei, Y. F.; Siu, G. G.; Zou, J. P.; Wu, X. L.

2004-04-01

359

From therapeutic jurisprudence...to jurisprudent therapy.  

PubMed

For nearly a decade, "therapeutic jurisprudence" (TJ) has provided a theoretical framework within which legal rules, legal procedure, and legal roles are analyzed in terms of their therapeutic, neutral, or antitherapeutic effects. This article proposed "jurisprudent therapy" (JT), an extension of the TJ model, as a context for analyzing mental health science, mental health practice, and mental health roles in terms of their "jurisprudent," neutral, or "antijurisprudent" effects. The JT perspective neither supplants nor supersedes TJ; rather, it mirrors and augments an established process for interdisciplinary contrast, comparison, and integration. Just as an empathic and evolving legal system provides psychological benefits, so does a legally informed and juridically compatible progression of social science promote principles of justice and human freedom. Consideration of these two complementary models in tandem yields an array of brainstorming devices, to synergistic effect, with heuristic implications for teaching, research, and service delivery. PMID:11018781

Drogin, E Y

2000-01-01

360

Tuning the conductivity of LaMnO3/SrTiO3 superlattices by stacking  

NASA Astrophysics Data System (ADS)

First-principles density-functional-theory calculations have been applied to study the structure and electronic properties of ultrathin LaMnO3/SrTiO3 superlattices. We predict that upon the change of stacking, antiferromagnetic LaMnO3/SrTiO3 superlattices can be tuned from non-conducting insulator to conducting metal. The corresponding microscopic structure change in the superlattices is also analyzed. We find that the metal-insulator transition is accompanied by a corresponding reduction/disappearance of the Jahn-Teller (JT) distortion in the LaMnO3 layer. The findings of this work illustrate the role of the JT distortion in the conductivity of transition-metal perovskites, and also suggest a new method for tuning metal-insulator transitions for functional device design.

Yao, Yanpeng; Rabe, Karin

2013-03-01

361

Production of 75-keV, 70-A, 10-s ion beams  

SciTech Connect

High-power long pulse ion sources were fabricated and tested at a prototype injector unit for JT-60. Ion beams of 70 A at an energy of 75 keV were extracted repeatedly for up to 10 s. The heat loadings to each grid were within our design values and each grid turned out to be thermally stable during 10 s pulse. The neutral beam power deposited to the beam target was over 1.43 MW, which corresponds to the design value of the JT-60 neutral beam injector. The e-folding half-width beam divergence angle was about 1.0/sup 0/ at optimum beam current and a proton ratio of about 80% was obtained. It was also confirmed that other beam line components, such as the ion beam dump and the cryopump, were sufficiently reliable.

Akiba, M.; Araki, M.; Horiike, H.

1982-12-01

362

Emergence of ferromagnetism and Jahn-Teller distortion in LaMn1?xCrxO3 (x<0.15)  

NASA Astrophysics Data System (ADS)

The emergence of a ferromagnetic component in LaMnO3 with low Cr-for-Mn substitution has been studied by x-ray absorption spectroscopy and x-ray magnetic circular dichroism at the Mn and Cr K edges. The local magnetic moment strengths for Mn and Cr are proportional to each other and follow the macroscopic magnetization. The net ferromagnetic components of Cr3+ and Mn3+ are found antiferromagnetically coupled. Unlike hole doping by La site substitution, the inclusion of Cr3+ ions up to x=0.15 does not decrease the Jahn-Teller (JT) distortion and consequently does not significantly affect the orbital ordering. This demonstrates that the emergence of the ferromagnetism is not related to JT weakening and likely arises from a complex orbital mixing.

Ramos, Aline Y.; Tolentino, Hélio C. N.; Soares, Márcio M.; Grenier, Stéphane; Bun?u, Oana; Joly, Yves; Baudelet, François; Wilhelm, Fabrice; Rogalev, Andrei; Souza, Raquel A.; Souza-Neto, Narcizo M.; Proux, Olivier; Testemale, Denis; Caneiro, Alberto

2013-06-01

363

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

364

Crossover from 2d to 3d in anisotropic Kondo lattices  

NASA Astrophysics Data System (ADS)

We study the crossover from two to three dimensions in Kondo lattices (KLM) using the Kondo necklace model (KNM). In order to diagonalize the KNM, we use a representation for the localized and conduction electron spins in terms of bond operators and a decoupling for the relevant Green's functions. Both models have a quantum critical point at a finite value of the ratio (J/t) between the Kondo coupling (J) and the hopping (t). In 2d there is no line of finite temperature antiferromagnetic (AF) transitions while for d?3 this line is given by, TN?|g| [D. Reyes, M.A. Continentino, Phys. Rev. B 76 (2007) 075114]. The crossover from 2d to 3d is investigated by turning on the electronic hopping (t) of conduction electrons between different planes. The phase diagram as a function of temperature T, J/t and ?=t/t, where t is the hopping within the planes is calculated.

Reyes, D.; Continentino, M. A.

2008-04-01

365

The effect of band Jahn-Teller distortion on the magnetoresistivity of manganites: a model study.  

PubMed

We present a model study of magnetoresistance through the interplay of magnetisation, structural distortion and external magnetic field for the manganite systems. The manganite system is described by the Hamiltonian which consists of the s-d type double exchange interaction, Heisenberg spin-spin interaction among the core electrons, and the static and dynamic band Jahn-Teller (JT) interaction in the e(g) band. The relaxation time of the e(g) electron is found from the imaginary part of the Green's function using the total Hamiltonian consisting of the interactions due to the electron and phonon. The calculated resistivity exhibits a peak in the pure JT distorted insulating phase separating the low temperature metallic ferromagnetic phase and the high temperature paramagnetic phase. The resistivity is suppressed with the increase of the external magnetic field. The e(g) electron band splitting and its effect on magnetoresistivity is reported here. PMID:21900738

Rout, G C; Panda, Saswati; Behera, S N

2011-09-08

366

Glass transition-related thermorheological complexity in polystyrene melts  

Microsoft Academic Search

The relaxation-modulus G(t) functional forms covering the whole time range are given by incorporating a stretched exponential for the structural- (glassy-) relaxation process into the extended reptation theory (ERT; for entangled systems) or the Rouse theory (for entanglement-free systems). The creep compliance J(t) curves of two entangled (A and B) and one entanglement-free (C) polystyrene samples (Plazek) as well as

Y.-H. Lin

2007-01-01

367

Transport signature of pseudo Jahn-Teller dynamics in a single-molecule transistor  

Microsoft Academic Search

We calculate the electronic transport through a molecular dimer, in which an excess electron is delocalized over equivalent monomers, which can be locally distorted. In this system the Born-Oppenheimer approximation breaks down resulting in quantum entanglement of the mechanical and electronic motion. We show that pseudo Jahn-Teller (pJT) dynamics of the molecule gives rise to conductance peaks that indicate this

F. Reckermann; M. Leijnse; M. R. Wegewijs; H. Schoeller

2008-01-01

368

Frequency response of sampled-data systems  

Microsoft Academic Search

This paper develops a frequency-domain theory that provides a method to analyze and design sampled-data control systems, including their intersample behaviors. The key idea is to consider the signal space X?$?= {x(t) ¦x(t) = ?n? = ?x xn exp (j?t + jn?st), ?n = ?x ?xn?2 < ?}, where ?s is the sampling angular frequency. It is shown that a

Mituhiko Araki; Yoshimichi Ito; Tomomichi Hagiwara

1996-01-01

369

US EPA, Pesticide Product Label, GOLD CREST H-10% G, 02 ...  

EPA Pesticide Factsheets

... Cont,wt w,th t..,klr' (.I'l :,:lll',)f t!lX,r:, ~~Yf11pt()r,js !\\) r:{Jt iJrl'.ll"" VoIP"", ,1I,d rill"! III Cd',f' 01 "II' Lt( t 'lIlttl (,io

2011-04-14

370

The utility of post-concussion neuropsychological data in identifying cognitive change following sports-related MTBI in the absence of baseline data.  

PubMed

Neuropsychological tests have become commonplace in the assessment of sports-related concussion. Typically, post-injury test data are compared to pre-injury "baselines." Baseline testing can be expensive and logistically challenging, yet the usefulness of neuropsychological baseline testing has not been tested empirically. This paper examines the extent to which baseline testing is useful for detecting neurocognitive deficits following sports concussion in a college-age population. A total of 223 collegiate athletes from multiple sports who sustained concussions and had both baseline and post-injury testing using Immediate Post-concussion Assessment and Cognitive Testing (ImPACT) were included in the study. Reliable change (RC) in scores was determined by two approaches, the Jacobson and Truax (JT) and the Gulliksen-Lord-Novick (GLN) methods. The 90% confidence interval was used for both. Classification using these methods was compared to standard normative methods that compared post-concussion performance to baseline population means. Agreement between reliable change and normative methods was examined using Cohen's Kappa scores to determine whether post-injury scores alone could identify reliable cognitive decline. Mean time from concussion to post-injury testing was 3.40 days. The percentage of athletes who declined when using the JT method was similar to the percentage that would be expected to decline due to chance alone. Although the GLN and JT methods demonstrated moderate to substantial agreement, the GLN method consistently identified more cognitively compromised athletes than the JT method. Post-injury scores alone identified a significant majority of athletes with a reliable decline on ImPACT. Although preliminary and in need of replication across age groups and instruments, these findings suggest that the majority of collegiate athletes who experience clinically meaningful post-concussion cognitive decline can be identified without baseline data. PMID:23003560

Echemendia, Ruben J; Bruce, Jared M; Bailey, Christopher M; Sanders, James Forrest; Arnett, Peter; Vargas, Gray

2012-09-25

371

Mutual Inductance in the BirdCage Resonator  

Microsoft Academic Search

Formulas are derived to account for the effect of the mutual inductances, between all meshes, upon the electrical resonance spectra bird-cage resonators, and similar structures such as the TEM resonator of P.K.H. Röschmann (United States Patent 4,746,866) and J.T. Vaughanet al.(Magn. Reson. Med.32,206, 1994). The equations are parameterized in terms of isolated mesh frequencies and coupling coefficients, and ought therefore

James Tropp

1997-01-01

372

Naïve noncommutative blowups at zero-dimensional schemes  

Microsoft Academic Search

In an earlier paper [D.S. Keeler, D. Rogalski, J.T. Stafford, Naïve noncommutative blowing up, Duke Math. J. 126 (2005) 491–546, MR 2120116], we defined and investigated the properties of the naïve blowup of an integral projective scheme X at a single closed point. In this paper we extend those results to the case when one naïvely blows up X at

D. Rogalski; J. T. Stafford

2007-01-01

373

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

374

Neoclassical Resistivity including the Bootstrap Current  

Microsoft Academic Search

The Z_eff^nc, which is obtained from the neoclassical resistivity including the trapped-particle effects, has not always matched experimental results. Especially for clean discharges in hydrogen, the Z_eff^nc has been found to be less than unity (on D-III, PLT, JT-60, ASDEX, TEXT Tokamaks). We present a model in this paper to explain the electric conductivity, where trapped-particles effects and the bootstrap

Jianshan Mao; Maoquan Wang; P. E. Phillips

1998-01-01

375

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

376

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

377

Radiation damage in carbon-carbon composites  

Microsoft Academic Search

Graphite and carbon-carbon composite materials are widely used in plasma facing applications in current Tokamak devices such as TFTR and DIIID in the USA, JET, Tore Supra and TEXTOR in Europe, and JT-60U in Japan. Carbon-carbon composites are attractive choices for Tokamak limiters and diverters because of their low atomic number, high thermal shock resistance, high melting point, and high

T. D. Burchell; W. P. Eartherly; G. E. Nelson

1992-01-01

378

Improved container electrode coatings for Na\\/S battery systems. Final report  

Microsoft Academic Search

Current sodium sulfur (Na\\/S) battery systems utilize the fast ion conducting properties of sodium betaâ³-alumina electrolyte (BASE) to create high energy density sodium-sulfur electrochemical cells which can be used as components of secondary batteries. Since the days when these cells were invented at the Ford Motor Company Scientific Laboratory by J.T. Kummer and N. Weber, problems with container electrode corrosion

Hunt

1995-01-01

379

Study of Magnetization in Manganite System in the Presence of Lattice Distortion  

NASA Astrophysics Data System (ADS)

The manganites of the type Re1-xAxMnO3 (Re=La, Nd, A=Ca, Sr, Ba) are believed to be half metallic magnets exhibiting colossal magnetoresistance (CMR). The manganite system is described by a simple model Hamiltonian consisting of the hopping of the itinerant d-electrons in the doubly degenerate eg band of Mn ions which is split by a static J-T lattice distortion due to band Jahn-Teller (J-T) effect. An external magnetic field results in further Zeeman splitting of the same eg band. The ferromagnetism is assumed to originate from the exchange interaction between the spins of the localized core t2g electrons. The J-T split itinerant (eg) bands are assumed to hybridize rather strongly with the on-site localized (t2g) levels. In the model under consideration the magnetization (m) as well as the lattice strain (e) are expected to depend on the model parameters of the system: i.e. the position of the localized level (d) with respect to the Fermi level, the strength of hybridization (v), the magnetic exchange coupling constant (g1), J-T coupling constant (g), external magnetic field (b) and the impurity concentration (x). The equations for the magnetization and the lattice distortion are solved self-consistently. The effect of different interactions on the quasiparticle bands and the density of states (DOS) are analyzed in detail to understand the evolution of the physical properties of the system on switching the interactions. The temperature dependence of the magnetization due to the localized electrons and that induced in the conduction band are studied.

Rout, G. C.; Parhi, N.; Behera, S. N.

380

US EPA, Pesticide Product Label, RMC RODENT BAIT MEAT ...  

EPA Pesticide Factsheets

... tf) ! 01 lL-jhlt H ,(I()(J[1 : I " ',; , t,J'IU\\N (:'~Itdi[lpr:-; \\/vtlf'rt' l~liCt' (I: "l ,1\\"" f!,j'JP tlt"'Il Sf:P'~, B.-lit st;l~" 'ns "t " "i;: t" 10 f'~L! dr,' rp(Cml[Cf~!lcJt~d f.,SSlJrp ...

2011-04-14

381

The blue luminescence of PbWO 4 single crystals  

Microsoft Academic Search

The blue emission spectra were measured in three different PbWO4 crystals at T? (80, 300) K showing rather low or no contribution of the green emission band. Non-elementary character of the blue luminescence spectrum is found which is qualitatively the same in all the crystals measured. It is explained by the influence of JT effect on nearly tetrahedral (WO4)2? complex

K. Polak; M. Nikl; K. Nitsch; M. Kobayashi; M. Ishii; Y. Usuki; O. Jarolimek

1997-01-01

382

Mitigating the geometrical limitations of conventional sputtering by controlling the ion-to-neutral ratio during high power pulsed magnetron sputtering  

Microsoft Academic Search

High power pulsed magnetron sputtering has been used to grow thin chromium layers on substrates facing and orthogonal to the target. It is demonstrated that at low peak target current density, jT0.6A\\/cm2 corresponding to a low ion-to-neutral flux ratio, films grown on substrates facing the target exhibit in-plane alignment. This is due to the rectangular shape of the target that

G. Greczynski; J. Jensen; L. Hultman

2011-01-01

383

Postpartum sacral fracture presenting as lumbar radiculopathy: A case report 1 1 No commercial party having a direct financial interest in the results of the research supporting this article has or will confer a benefit upon the author(s) or upon any organization with which the author(s) is\\/are associated  

Microsoft Academic Search

Lin JT, Lutz GE. Postpartum sacral fracture presenting as lumbar radiculopathy: a case report. 2004;85:1358–61.Although rare, sacral stress fractures may occur in pregnant women, and osteoporosis of pregnancy is a poorly understood entity. We present the case of a young, postpartum, recreational runner who developed low back pain (LBP) and radicular symptoms suggestive of L5 radiculopathy found to be secondary

Julie T Lin; Gregory E Lutz

2004-01-01

384

Similarity-Transformed Chiral NN+3N Interactions for the Ab Initio Description of C12 and O16  

Microsoft Academic Search

We present first ab initio no-core shell model (NCSM) calculations using similarity renormalization group (SRG) transformed chiral two-nucleon (NN) plus three-nucleon (3N) interactions for nuclei throughout the p-shell, particularly C12 and O16. By introducing an adaptive importance truncation for the NCSM model space and an efficient JT-coupling scheme for the 3N matrix elements, we are able to surpass previous NCSM

Robert Roth; Joachim Langhammer; Angelo Calci; Sven Binder; Petr Navrátil

2011-01-01

385

US EPA, Pesticide Product Label, BLACK LEAF BORER ...  

EPA Pesticide Factsheets

... ri(l? nort." St.1t,· Str .... ... J. J"'r(·r)ri~n1 t" f"'Jr r,·r:-I")r.·t~;, H~: '1) l:q·j,lnn ('In apI'll·· dnd uronrh tr·~f'~ r(>qu~t ?? t; cI hi) 1,fV !,yn-h,lr"Ji 'jt :nfpr"J,11 rprtar·ilp ...

2011-04-14

386

Magnetic and Transport Characterization of NbTi Strands as a Basis for the Design of Fusion Magnets  

Microsoft Academic Search

We present the results of an extended measurement campaign carried out on available NbTi commercial strands to be used in the design of fusion reactor magnets, including candidate strands for the ITER high field Poloidal Coils, PF1\\/6, and for the Toroidal Field Coils of the JT-60SA Tokamak. Magnetic and transport measurements have been carried out at variable temperature and magnetic

Luigi Muzzi; Luigi Affinito; Valentina Corato; Gianluca De Marzi; Aldo Di Zenobio; Chiarasole Fiamozzi Zignani; Matteo Napolitano; Simonetta Turtu; Rosario Viola; Antonio della Corte

2009-01-01

387

A New European Production Line for CIC Conductors  

Microsoft Academic Search

The on-going construction of the ITER and JT-60SA tokamak reactors requires the production of a large quantity of Cable-In-Conduit Conductors (CICCs) to be employed in the superconducting magnets for plasma confinement and control. A new company, named ICAS (Italian Consortium for Applied Superconductivity), was established thanks to the large expertise in this field that has been present in Italy for

Antonio della Corte; L. Affinito; U. Besi Vetrella; S. Chiarelli; A. Di Zenobio; L. Morici; L. Muzzi; G. M. Polli; L. Reccia; S. Turtu; A. Bragagni; G. Scoccini; M. Seri; D. Valori; F. Quagliata; G. Roveta; M. Roveta

2012-01-01

388

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

389

US EPA, Pesticide Product Label, DUTOXIDE ULD ...  

EPA Pesticide Factsheets

... 1Ir~ I::':#o-~"l r.-'-, 1 ? $f~t'(tprr4.Jt1 pP~IS (j1M'1, ".m~·~ ~ ct ,',tt'aj\\ frtl ~~,Jf \\f ... p~o.·.e L~ J rolr11 ~ Ci~"('f~.tt-~'O)IO( \\l\\ t\\111'41>i e.1f~!~~ '5;!~ .. I:In4 ...

2011-04-14

390

US EPA, Pesticide Product Label, NACO BUTYL ESTER 2,4-D ...  

EPA Pesticide Factsheets

... r r ? VJ'f-1.5 T 111<., POOU{ t ... l·,1.., h.tll ,-,t'.11 watE'r .11',1 ret l'rOlill ~ r1lt't1'(<11 .lth·fl~·(' lX.J N(JT (I,' f"""lIdt.· '.·t'll (,' f'b <1<,tutt" Du r~ol ."tuft.' I\\t.',tf ' ...

2011-04-14

391

US EPA, Pesticide Product Label, BERMACIDE 72, 09/07 ...  

EPA Pesticide Factsheets

... ('f'1 a. t',u ~ \\1':1 Of trII 11;:'tf'lf'i 'fIf',l! t:ii1r1 (,II""" Ubft...J .~ 1 , .. ltIH {iCon .rot'l f'!Ir..jt"'l ,;;m(~tfltc" Hi':r.!;.1 ,I t_11 IGM:d lroa" ((,tll.~,:"l!C!L ,1luu1 I.~.J twu ...

2011-04-21

392

US EPA, Pesticide Product Label, AVITROL MIXED GRAINS ...  

EPA Pesticide Factsheets

... 1 lv' th j 'S t res s s.' m p to m ~~ I n G ,- J liS ~j J . i ? ·1 r : fl t ;'1 (l .2 nl (j t .. ' It cd b a I t :l 10' (~ II 3 b let '') ,( 1ti.(:·' t}:,. 'i~C!5, :~ e 1()i~~,,:lr~rjcr Jt ~r ...

2011-04-19

393

US EPA, Pesticide Product Label, PARATHION 8-E, 10/21 ...  

EPA Pesticide Factsheets

... t'l,-i, t, n'L;nj ... NV~r -;ltt~~~h?Jt?[¥rl,~~,; J~~~ L~JS?,t 1 ~~[J'~o,t tlo 7 ... lW,UCf, ~DI~'-I'\\ph'c!, le.l''1or'')f>iS tJ:;(' l,'J pt Uc: n,' JP~J!v wit"in'-77.~vs G~ h ...

2011-04-14

394

Jet structure from dihadron correlations in d+Au collisions at sNN=200 GeV  

Microsoft Academic Search

Dihadron correlations at high transverse momentum pT in d+Au collisions at sNN=200 GeV at midrapidity are measured by the PHENIX experiment at the Relativistic Heavy Ion Collider. From these correlations, we extract several structural characteristics of jets: the root-mean-squared transverse momentum of fragmenting hadrons with respect to the jet <jT2>, the mean sine-squared of the azimuthal angle between the jet

S. S. Adler; S. Afanasiev; C. Aidala; N. N. Ajitanand; Y. Akiba; A. Al-Jamel; J. Alexander; K. Aoki; L. Aphecetche; R. Armendariz; S. H. Aronson; R. Averbeck; T. C. Awes; V. Babintsev; A. Baldisseri; K. N. Barish; P. D. Barnes; B. Bassalleck; S. Bathe; S. Batsouli; V. Baublis; F. Bauer; A. Bazilevsky; S. Belikov; M. T. Bjorndal; J. G. Boissevain; H. Borel; M. L. Brooks; D. S. Brown; N. Bruner; D. Bucher; H. Buesching; V. Bumazhnov; G. Bunce; J. M. Burward-Hoy; S. Butsyk; X. Camard; P. Chand; W. C. Chang; S. Chernichenko; C. Y. Chi; J. Chiba; M. Chiu; I. J. Choi; R. K. Choudhury; T. Chujo; V. Cianciolo; Y. Cobigo; B. A. Cole; M. P. Comets; P. Constantin; M. Csanád; T. Csörgö; J. P. Cussonneau; D. D'Enterria; K. Das; G. David; F. Deák; H. Delagrange; A. Denisov; A. Deshpande; E. J. Desmond; A. Devismes; O. Dietzsch; J. L. Drachenberg; O. Drapier; A. Drees; A. Durum; D. Dutta; V. Dzhordzhadze; Y. V. Efremenko; H. En'yo; B. Espagnon; S. Esumi; D. E. Fields; C. Finck; F. Fleuret; S. L. Fokin; B. D. Fox; Z. Fraenkel; J. E. Frantz; A. Franz; A. D. Frawley; Y. Fukao; S.-Y. Fung; S. Gadrat; M. Germain; A. Glenn; M. Gonin; J. Gosset; Y. Goto; R. Granier De Cassagnac; N. Grau; S. V. Greene; M. Grosse Perdekamp; H.-Å. Gustafsson; T. Hachiya; J. S. Haggerty; H. Hamagaki; A. G. Hansen; E. P. Hartouni; M. Harvey; K. Hasuko; R. Hayano; X. He; M. Heffner; T. K. Hemmick; J. M. Heuser; P. Hidas; H. Hiejima; J. C. Hill; R. Hobbs; W. Holzmann; K. Homma; B. Hong; A. Hoover; T. Horaguchi; T. Ichihara; V. V. Ikonnikov; K. Imai; M. Inaba; M. Inuzuka; D. Isenhower; L. Isenhower; M. Ishihara; M. Issah; A. Isupov; B. V. Jacak; J. Jia; O. Jinnouchi; B. M. Johnson; S. C. Johnson; K. S. Joo; D. Jouan; F. Kajihara; S. Kametani; N. Kamihara; M. Kaneta; J. H. Kang; K. Katou; T. Kawabata; A. V. Kazantsev; S. Kelly; B. Khachaturov; A. Khanzadeev; J. Kikuchi; D. J. Kim; E. Kim; G.-B. Kim; H. J. Kim; E. Kinney; A. Kiss; E. Kistenev; A. Kiyomichi; C. Klein-Boesing; H. Kobayashi; L. Kochenda; V. Kochetkov; R. Kohara; B. Komkov; M. Konno; D. Kotchetkov; A. Kozlov; P. J. Kroon; C. H. Kuberg; G. J. Kunde; K. Kurita; M. J. Kweon; Y. Kwon; G. S. Kyle; R. Lacey; J. G. Lajoie; Y. Le Bornec; A. Lebedev; S. Leckey; D. M. Lee; M. J. Leitch; M. A. L. Leite; X. H. Li; H. Lim; A. Litvinenko; M. X. Liu; C. F. Maguire; Y. I. Makdisi; A. Malakhov; V. I. Manko; Y. Mao; G. Martinez; H. Masui; F. Matathias; T. Matsumoto; M. C. McCain; P. L. McGaughey; Y. Miake; T. E. Miller; A. Milov; S. Mioduszewski; G. C. Mishra; J. T. Mitchell; A. K. Mohanty; J. M. Moss; D. Mukhopadhyay; M. Muniruzzaman; S. Nagamiya; J. L. Nagle; T. Nakamura; J. Newby; A. S. Nyanin; J. Nystrand; E. O'Brien; C. A. Ogilvie; H. Ohnishi; I. D. Ojha; H. Okada; K. Okada; A. Oskarsson; I. Otterlund; K. Oyama; K. Ozawa; D. Pal; A. P. T. Palounek; V. Pantuev; V. Papavassiliou; W. J. Park; S. F. Pate; H. Pei; V. Penev; J.-C. Peng; H. Pereira; V. Peresedov; A. Pierson; C. Pinkenburg; R. P. Pisani; M. L. Purschke; A. K. Purwar; J. M. Qualls; J. Rak; I. Ravinovich; K. F. Read; M. Reuter; K. Reygers; V. Riabov; Y. Riabov; G. Roche; A. Romana; M. Rosati; S. S. E. Rosendahl; P. Rosnet; V. L. Rykov; S. S. Ryu; N. Saito; T. Sakaguchi; S. Sakai; V. Samsonov; L. Sanfratello; R. Santo; H. D. Sato; S. Sato; S. Sawada; Y. Schutz; V. Semenov; R. Seto; T. K. Shea; I. Shein; T.-A. Shibata; K. Shigaki; M. Shimomura; A. Sickles; C. L. Silva; D. Silvermyr; K. S. Sim; A. Soldatov; R. A. Soltz; W. E. Sondheim; S. P. Sorensen; I. V. Sourikova; F. Staley; P. W. Stankus; E. Stenlund; M. Stepanov; A. Ster; S. P. Stoll; T. Sugitate; J. P. Sullivan; S. Takagi; E. M. Takagui; A. Taketani; K. H. Tanaka; Y. Tanaka; K. Tanida; M. J. Tannenbaum; A. Taranenko; P. Tarján; T. L. Thomas; M. Togawa; J. Tojo; H. Torii; R. S. Towell; V.-N. Tram; I. Tserruya; Y. Tsuchimoto; H. Tydesjö; N. Tyurin; T. J. Uam; H. W. Van Hecke; J. Velkovska; M. Velkovsky; V. Veszprémi; A. A. Vinogradov; M. A. Volkov; E. Vznuzdaev; X. R. Wang; Y. Watanabe; S. N. White; N. Willis; F. K. Wohn; C. L. Woody; W. Xie; A. Yanovich; S. Yokkaichi; G. R. Young; I. E. Yushmanov; W. A. Zajc; C. Zhang; S. Zhou; J. Zimányi; L. Zolin; X. Zong

2006-01-01

395

Mediated uptake of folate by a high-affinity binding protein in sublines of L1210 cells adapted to nanomolar concentrations of folate  

Microsoft Academic Search

Summary An L1210 cell line (JT-1), which can grow in medium supplemented with 1nm folate, has been isolated. These cells exhibit a slower growth rate than folate-replete parental cells and have a lower ability to transport folate or methotrexate via the reduced folate transport system. Measurements at nanomolar concentrations of folate revealed that the adapted cells have acquired a high-affinity

Gary B. Henderson; Judy M. Tsuji; Harish P. Kumar

1988-01-01

396

US EPA, Pesticide Product Label, GREENWAY WEED AND ...  

EPA Pesticide Factsheets

... I' rb,· t','ndhn, ii\\e ,tnil '(Jf\\rlltl!l~I\\, I)f I)'," "I qlJ'. 111 ' ''-' It ,l~·l f!!!f \\!!lfj~r tlJl'1! dI(I" ! ' It"'r'J'1'.1011 Of 'IOjitrr'rl I:pdh·! tlJl' I'1.ItIlJt!"\\lHI" (tl ',"II,,! ...

2011-04-19

397

Total water vapor column retrieval from MSG-SEVIRI split window measurements exploiting the daily cycle of land surface temperatures  

Microsoft Academic Search

A physically based algorithm for the retrieval of total water vapor column (TWC) over cloud-free land surfaces proposed by Kleespies and McMillin [Kleespies, J.T., McMillin L.M. (1990). Retrieval of precipitable water from observations in the Split Window over varying surface temperatures. Journal of Applied Meteorology, 29, 851–862.] is evaluated and extended for use in atmospheric correction and surface irradiance calculation

M. Schroedter-Homscheidt; A. Drews; S. Heise

2008-01-01

398

The second ASTM\\/ESIS Symposium on Constraint Effects in Fracture; an overview  

Microsoft Academic Search

The Second ASTM\\/ESIS Symposium on Constraint Effects in Fracture attracted a total of 24 contributions. These papers addressed various models to characterize, quantify and predict constraint effects, as well as experimental\\/validation studies and application studies. Available constraint models include the mechanics-based approaches of two-parameter fracture mechanics (2PFM) (i.e. J-T, J-Q, J-A2, J-?g), statistical techniques based on the Weibull model, and

Mark T. Kirk

1995-01-01

399

Identification of QTLs for Ralstonia solanacearum race 3-phylotype II resistance in tomato  

Microsoft Academic Search

Resistance against a Ralstonia solanacearum race 3-phylotype II strain JT516 was assessed in a F2:3 and a population of inbred lines (RIL), both derived from a cross between L. esculentum cv. Hawaii 7996 (partially resistant) and L. pimpinellifolium WVa700 (susceptible). Resistance criteria used were the percentage of wilted plants to calculate the AUDPC value, and bacterial colonization scores in roots

A. Carmeille; C. Caranta; J. Dintinger; P. Prior; J. Luisetti; P. Besse

2006-01-01

400

Utilizing numerical techniques in turbofan inlet acoustic suppressor design  

NASA Astrophysics Data System (ADS)

Numerical theories in conjunction with previously published analytical results are used to augment current analytical theories in the acoustic design of a turbofan inlet nacelle. In particular, a finite element-integral theory is used to study the effect of the inlet lip radius on the far field radiation pattern and to determine the optimum impedance in an actual engine environment. For some single mode JT15D data, the numerical theory and experiment are found to be in a good agreement.

Baumeister, K. J.

401

Destabilization mechanism of edge-localized MHD modes by a toroidal rotation in tokamaks  

Microsoft Academic Search

In JT-60U, some experimental results showed that the ELM frequency depends on the toroidal rotation, and the rapid rotation in the counter direction of the plasma current changes from Type-I ELM to Grassy ELM, whose frequency is high and the amplitude is small [1]. Since both Type-I and Grassy ELMs are considered as ideal MHD modes destabilizing near the plasma

Nobuyuki Aiba; Masaru Furukawa; Makoto Hirota; Shinji Tokuda

2009-01-01

402

Improved recovery from Gulf of Mexico reservoirs. Volume I (of 4): Task 1, conduct research on mud-rich submarine fans. Final report, February 14, 1995October 13, 1996  

Microsoft Academic Search

The objective for this portion of the research involved conducting field studies and laboratory investigations to develop and refine models for mud-rich submarine fan architectures used by seismic analysis and reservoir engineers. These research aspects have been presented in two papers as follows: (1) Bouma, A.H., {open_quotes}Review of Fine-Grained Submarine Fans and Turbidite Systems{close_quotes}; (2) Kirkova, J.T. and Lorenzo, J.M.,

W. C. Kimbrell; Z. A. Bassiouni; A. T. Bourgoyne

1997-01-01

403

An in vivo microperfusion study of distal tubule bicarbonate reabsorption in normal and ammonium chloride rats.  

PubMed

For many years it has been thought that distal nephron hydrogen ion secretion can be importantly modulated by factors such as sodium delivery, sodium avidity, and potassium stores. Free flow micropuncture studies have also indicated that the rate of bicarbonate delivery may also alter the rate of bicarbonate reabsorption. The present studies were undertaken to examine possible luminal influences on total CO2 reabsorption in microperfused distal tubules in the rat in vivo. Tubules from normal and acidotic rats were perfused with five solutions in a manner that induced changes in bicarbonate load, sodium and potassium fluxes (JNa, JK), and luminal sulfate concentration. in each collected perfusate, simultaneous analyses were undertaken to determine water reabsorption, Na, and K concentrations using graphite furnace atomic absorption spectroscopy and total CO2 by microcalorimetry. Using factorial analysis of covariance to account for confounding effects on total CO2 flux (JtCO2) such as water reabsorption, distal tubules of acidotic rats reabsorbed CO2 in the range of 50-112 pmol X min-1 X mm-1 X These JtCO2 values were not significantly correlated with HCO3 load, JNa, or JK despite changes in the latter from net reabsorption to net secretion. Distal tubules of rats with normal acid-base status had JtCO2 values which were neither significantly different from zero nor correlated with changes in JK and JNa. Further, doubling the load from 250-500 pmol/min (by doubling the perfusion rate of 25-mM HCO3 solutions) did not stimulate JtCO2 in these normal animals. Accordingly, these acute in vivo microperfusion studies indicate for the first time that neither load nor potassium or sodium fluxes are important modulators of distal tubule bicarbonate reabsorption. PMID:2982915

Levine, D Z

1985-02-01

404

Ball Aerospace Hybrid Space Cryocoolers  

Microsoft Academic Search

This paper describes the design, development, testing, and performance at Ball Aerospace of a long-life hybrid (combination of Stirling and Joule-Thomson [J-T] thermodynamic cycles) space cryocooler. Hybrid coolers are synergistic combinations of two thermodynamic cycles that combine advantages of each cycle to yield overall improved performance. Hybrid cooler performance advantages include: 1) load leveling of large heat loads; 2) remote

W. Gully; D. S. Glaister; P. Hendershott; V. Kotsubo; J. S. Lock; E. Marquardt

2008-01-01

405

Vibration-Free Joule-Thomson Cryocoolers for Distributed Microcooling  

Microsoft Academic Search

This paper reports on an innovative concept for a space-borne Joule-Thomson (J-T) cryocooler that utilizes a continuous-flow compressor to provide cooling to multiple miniature cold heads. The heat transport to each cooling site is accomplished at ambient temperature, allowing large separation distances between cryocooler components and cooling sites with minimal performance impact. The compressor uses non-contacting, gas-lubricated bearings and is

W. Chen; M. Zagarola

406

US EPA, Pesticide Product Label, ENOZ CEDAR SCENTED ...  

EPA Pesticide Factsheets

... I, f ,. r ~. j!.lJt:..(3(5~!ll\\!ll~ v l:tSh 'l.!A'A..:;- I.ll!l;ji1!.I.IB i~ot!li·lt l'1!C.~t.!.lIIi.l.~~·" t;'l!Ju~:J lr..!Jl~II"'-=" J i:.i.9-J' ·Wf ,.!iIi ,',48d' jil!ll~ '-J t~~!.i\\!J.!i2 ,. ... ...

2011-04-14

407

US EPA, Pesticide Product Label, BONIDE ROSE SPRAY ...  

EPA Pesticide Factsheets

... Ci~t)cGC ;:1_ (~OO'I,~ ('~l!Ll iH'l':/."pd 1)1 0x·{';.b·l) 'C~l1.-~j.~i U'Ji:'l:~.T'7;tO!,,·- tJt---C'l:i_\\)r,: n~lC'\\l l)'IUi"·i.:·: u·jl" \\'('1-e '1-\\' ·'P·)1-(1·'t(\\Ll 'i:t' 1)u'~ (I.il ...

2011-04-13

408

The Structure of the Solar Cycle Maximum Phase in the Galactic Cosmic Ray 11-year Variation  

Microsoft Academic Search

The maximum phase in the solar cycle variation of the galactic cosmic ray (GCR) intensity, J(t), is considered using neutron monitor, balloon and spacecraft data for the last five solar cycles (Nos. 19-23). For all time series considered the double peak structure (DPS) with the gap between the peaks is observed in the GCR modulation, M(t)=[J(t0)-J(t)]\\/J(t0), which proves that M

M. B. Krainev; G. A. Bazilevskaya

2004-01-01

409

US EPA, Pesticide Product Label, ALLRED'S TRI-KILL, 08/09 ...  

EPA Pesticide Factsheets

... q(~)(7)\\:'\\ r,rnv1,l"i tl';ft vr,l'· 1. SUhJT11 t ~nrl/()r ci tf' '" 11 dat,l rt>otll y(>~ f0!'.· rP..oistration/r .... rf'!'qi ~tri\\tion of VC)l1r rronllrt l1nf~~"r FTFP,," ~~Ilr=. ...

2011-04-21

410

Production of 75keV, 70-A, 10-s ion beams  

Microsoft Academic Search

High-power long pulse ion sources were fabricated and tested at a prototype injector unit for JT-60. Ion beams of 70 A at an energy of 75 keV were extracted repeatedly for up to 10 s. The heat loadings to each grid were within our design values and each grid turned out to be thermally stable during 10 s pulse. The

Masato Akiba; Masanori Araki; Hiroshi Horiike; Takao Ito; Mikito Kawai; Masaaki Kuriyama; Shigeru Kitamura; Shinzaburo Matsuda; Mamoru Matsuoka; Hidetoshi Mukaida; Yoshiaki Oguchi; Yoshihiro Ohara; Tokumichi Ohga; Hiroshi Ohtsuki; Yoshikazu Okumura; Takemasa Shibata; Hirofumi Shirakata; Shigeru Tanaka

1982-01-01

411

Detection of Individual Vortices in Micron-Size Sr2RuO4 Rings by Phase-Locked Cantilever  

NASA Astrophysics Data System (ADS)

We describe a feedback-based dynamic cantilever magnetometry technique capable of achieving high magnetic moment sensitivity with low applied fields. Using this technique, we have observed periodic entry of vortices into mesoscopic Sr2RuO4 rings. The quantized jump in the magnetic moment of the particle produced by individual vortices was measured with a resolution of 7x10-19J/T at an applied field of 1 G.

Jang, Joonho; Budakian, Raffi; Maeno, Yoshiteru

2010-03-01

412

Familial Isolated Hyperparathyroidism Is Rarely Caused by Germline Mutation in HRPT2, the Gene for the Hyperparathyroidism-Jaw Tumor Syndrome  

Microsoft Academic Search

Familial isolated hyperparathyroidism (FIHP) can result oc- casionally from the incomplete expression of a syndromic form of familial hyperparathyroidism (HPT), specifically mul- tiple endocrine neoplasia type 1 (MEN1), familial hypocalci- uric hypercalcemia, or the hyperparathyroidism-jaw tumor syndrome (HPT-JT). The cause of FIHP has not been identi- fied in the majority of families. We investigated 32 families with FIHP to determine

WILLIAM F. SIMONDS; CHRISTIANE M. ROBBINS; SUNITA K. AGARWAL; GEOFFREY N. HENDY; JOHN D. CARPTEN; STEPHEN J. MARX

413

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

414

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

415

A perforated plate stacked Si\\/glass heat exchanger with in-situ temperature sensing for joule-thomson coolers  

Microsoft Academic Search

This paper reports a micromachined recuperative heat exchanger integrated with in-situ temperature sensors. In this design, numerous high-conductivity silicon plates, integrated with platinum resistance temperature detectors (Pt RTDs) are fabricated and stacked alternating with low- conductivity Pyrex spacers. The device is intended for use with Joule-Thomson (J-T) coolers. The fabricated versions of the device have a footprint of 1 x

Weibin Zhu; Michael J. White; Gregory F. Nellis; Sanford A. Klein; Yogesh B. Gianchandani

2008-01-01

416

A Si\\/Glass Bulk-Micromachined Cryogenic Heat Exchanger for High Heat Loads: Fabrication, Test, and Application Results  

Microsoft Academic Search

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 Joule-Thomson (J-T) coolers

Weibin Zhu; Michael J. White; Gregory F. Nellis; Sanford A. Klein; Yogesh B. Gianchandani

2010-01-01

417

Effect of Chicken Anemia and Infectious Bursal Disease Vaccines and Marek's Disease Virus on the Development of Cellulitis and Myositis Lesions in Floor-Reared MHC-Defined Broiler Chickens  

Microsoft Academic Search

Wang, C., Norton, R.A., Macklin, K.S. and Krehling, J.T. 2005. Effect of chicken anemia and infectious bursal disease vaccines and Marek's disease virus on the development of cellulitis and myositis lesions in floor-reared MHC-defined broiler chickens. J. Appl. Anim. Res., 27: 1–5.In this experiment, 414 chickens were reared in a house in which the previous flock had experienced Marek's disease.

Chengming Wang; Robert A. Norton; Kenneth S. Macklin; James T. Krehling

2005-01-01

418

Ball Aerospace Long Life, Low Temperature Space Cryocoolers  

Microsoft Academic Search

This paper describes the development, qualification, characterization testing and performance at Ball Aerospace of long life, low temperature (from 4 to 35 K) space cryocoolers. For over a decade, Ball has built long life (>10 year), multi-stage Stirling and Joule-Thomson (J-T) cryocoolers for space applications, with specific performance and design features for low temperature operation. As infrared space missions have

D. S. Glaister; W. Gully; E. Marquardt; R. Stack

2004-01-01

419

Ball Aerospace 4-6 K Space Cryocooler  

Microsoft Academic Search

This paper describes the design, development, testing and performance at Ball Aerospace of a long life, 4-6 K temperature space cryocooler. For temperatures to 4 K and below, Ball has developed a hybrid Stirling\\/ Joule-Thomson (J-T) cooler. The hybrid cooler has been verified in test to 3.5 K on a Ball program and a 6 K Development Model is in

D. S. Glaister; W. Gully; R. Ross; P. Hendershott; E. Marquardt; V. Kotsubo

2006-01-01

420

A Study of the Use of 6K ACTDP Cryocoolers for the MIRI Instrument on JWST  

Microsoft Academic Search

The Mid Infrared Instrument (MIRI) of the James Webb Space Telescope (JWST) is a demand- ing application for the use of space cryocoolers. During calendar year 2003 an extensive study was carried out examining the application to this mission of hybrid 6K\\/18K J-T cryocoolers developed by NASA as part of their Advanced Cryocooler Technology Development Program (ACTDP). Among the most

R. G. Ross

421

NGST Advanced Cryocooler Technology Development Program (ACTDP) Cooler System  

Microsoft Academic Search

The NGST ACTDP cooler features a 5-6 K Joule-Thomson (JT) cooler pre-cooled by a three-stage Pulse Tube (PT) cryocooler. Our design provides remote cooling of ~60 mW at 5 to 6 K and, optionally, remote cooling at 18 K. The NGST ACTDP cooler is being developed under contract with the Jet Propulsion Laboratory to enable active cooling of instruments including

D. Durand; J. Raab; R. Colbert; M. Michaelian; T. Nguyen; M. Petach; E. Tward

2006-01-01

422

Progress towards the development of hydrogen sorption cryocoolers for space applications  

Microsoft Academic Search

Sorption cryocoolers utilize metal hydride sorbent beds for the closed-cycle circulation of gaseous hydrogen through heat exchangers and a Joule-Thomson (J-T) expansion valve in order to achieve cold-stage temperatures below 30 K. These devices have high potential for satellite missions that require long term reliability, minimal vibrations, and low operating power. Designs for nominal 25 K liquid and 10 K

B. D. Freeman; E. L. Ryba; R. C. Bowman; J. R. Phillips

1997-01-01

423

US EPA, Pesticide Product Label, SPLAT-MAT SPINOSAD ME ...  

EPA Pesticide Factsheets

... 01-07-09 . PageS .··i,:;",J~J~~~f:~'P~\\~,9~~~'~PD~~pqleS!c.li9ht.·Po,e~i ?. fe~pes',·.dt~~s,i~c;in,i91·~t~q9j~~t~!.r?nicr,op,~~e~'Jt~n~sior· ... ...

2011-04-21

424

US EPA, Pesticide Product Label, SUSTAR 2-S PLANT ...  

EPA Pesticide Factsheets

... '')('lJf: ".lltuC', y BIIJ!"lr,,~~ f ,fC"'ldr(!{jTaSS p.,r,"Hl',J1 RyeqYdS~ !~~l.,jt 1.,.~1f tJ5S ~~ l\\llqlJ~tlf't'qr dSS <, U S"T, :', R 7 ': " , ( I' (" 1 r (I ...

2011-04-14

425

US EPA, Pesticide Product Label, PROBE 75 WETTABLE ...  

EPA Pesticide Factsheets

... 11l.ll\\.. A-.1.virvll.l...;Lut4J.l Ud.4.ar..ifi (.Jnu rorCa:lt.y :;jt~te~~enta oC(; \\i(';c(;;:.tc.ulc ul,Uc.l: t:i.;'~ i t.:o\\;.L-"tl lr'f.ie<..:t.iciut;!, L".'uI'Jicio(;' dell .. ...

2011-04-21

426

Modulation of the Cytotoxicity of Mitomycin C to EMT6 Mouse Mammary Tumor Cells by Dicoumarol in Vitro1  

Microsoft Academic Search

Aerobic and hypoxic cultures of EMT6 mouse mammary tumor cells were used to study the effects of dicoumarol (DIC) on the cytotoxicity of mitomycin C (MC). DIC protected aerobic cells from MC toxicity, but sensitized hypoxic cells to the cytotoxic actions of this antibiotic. Survival curves for cells treated with 1.5 jtM MC ±100 \\/IM DIC for different periods of

Sara Rockwell; Susan R. Keyes; Alan C. Sartorelli

1988-01-01

427

Cloning, expression, and characterization of a glycoside hydrolase family 50 ?-agarase from a marine Agarivorans isolate  

Microsoft Academic Search

The gene for a thermostable ?-agarase from Agarivorans sp. JA-1 was cloned and sequenced. It comprised an open reading frame of 2,988 base pairs, which encode a protein of 109,450 daltons consisting of 995 amino acid residues. A comparison of the entire sequence showed that the enzyme has 98.8% sequence similarities to ?-agarase from Vibrio sp. JT1070, indicating that it

Dong-Geun Lee; Geun-Tae Park; Nam Young Kim; Eo-Jin Lee; Min Kyung Jang; Young Gyun Shin; Gwang-Seok Park; Tae-Min Kim; Jae-Hwa Lee; Jung-Hyun Lee; Sang-Jin Kim; Sang-Hyeon Lee

2006-01-01

428

Status of and prospects for advanced tokamak regimes from multi-machine comparisons using the 'International Tokamak Physics Activity' database  

Microsoft Academic Search

Advanced tokamak regimes obtained in ASDEX Upgrade, DIII-D, FT-U, JET, JT-60U, TCV and Tore Supra experiments are assessed both in terms of their fusion performance and capability for ultimately reaching steady-state using data from the international internal transport barrier database. These advanced modes of tokamak operation are characterized by an improved core confinement and a modified current profile compared to

X. Litaudon; E. Barbato; A. Bécoulet; E. J. Doyle; T. Fujita; P. Gohil; F. Imbeaux; O. Sauter; G. Sips; J. W. Connor; Yu Esipchuk; T. Fukuda; J. Kinsey; N. Kirneva; S. Lebedev; V. Mukhovatov; J. Rice; E. Synakowski; K. Toi; B. Unterberg; V. Vershkov; M. Wakatani; T. Aniel; Yu F. Baranov; R. Behn; C. Bourdelle; G. Bracco; R. V. Budny; P. Buratti; B. Esposito; S. Ide; A. R. Field; C Greenfield; M. Greenwald; T. S. Hahm; G. T. Hoang; J. Hobirk; D. Hogeweij; A. Isayama; E. Joffrin; Y. Kamada; T. C. Luce; M. Murakami; V. Parail; Y.-K. M. Peng; F. Ryter; Y. Sakamoto; H. Shirai; T. Suzuki; H. Takenaga; T. Takizuka; T. Tala; M. R. Wade; J. Weiland

2004-01-01

429

Identification of errors in the electron density measurements of a tangential interferometer/polarimeter system during a tokamak discharge  

SciTech Connect

A new method for the comparative verification of electron density measurements obtained with a tangential interferometer and a polarimeter during a discharge is proposed. The possible errors associated with the interferometer and polarimeter are classified by the time required for their identification. Based on the characteristics of the errors, the fringe shift error of the interferometer and the low-frequency noise of the polarimeter were identified and corrected for the JT-60U tangential interferometer/polarimeter system.

Arakawa, H.; Kawano, Y.; Itami, K. [Japan Atomic Energy Agency, 801-1, Mukoyama, Naka 311-0193 (Japan)

2012-10-15

430

Initial Rupture of the 2005 Fukuoka, Japan, Earthquake (Mw6.6): 3D Rupture Focusing Effects?  

Microsoft Academic Search

The 2005 Fukuoka earthquake (Mw6.6) occurred on 20 March 2005 (JT) in the northwestern offshore of Fukuoka Prefecture, Japan, which shook strongly Fukuoka city and surrounded area. Although no station was in the source region because this earthquake occurred in offshore, many strong-motion stations recorded the seismic motion near the source region. Near-source strong-motion records of this earthquake have two

H. Takenaka; Y. Yamamoto; T. Nakamura; G. Toyokuni; H. Kawase

2005-01-01

431

Multi-machine transport analysis of hybrid discharges from the ITPA profile database  

Microsoft Academic Search

Current diffusion, heat transport modelling, and linear gyrokinetic stability analysis have been carried out on a set of seven hybrid discharges from AUG, DIII-D, JET and JT-60U, in order to gain better understanding of the physics underlying this promising candidate scenario for ITER. Within this dataset, the GLF23 model has a higher accuracy than the Weiland model in predicting the

F. Imbeaux; J. F. Artaud; J. Kinsey; T. J. J. Tala; C. Bourdelle; T. Fujita; C. Greenfield; E. Joffrin; Y. S. Na; V. V. Parail; Y. Sakamoto; A. C. C. Sips; I. Voitsekovitch; contributors to the EFDA-JET Workprogramme

2005-01-01

432

Conceptual design of the Steady State Tokamak Reactor (SSTR)  

Microsoft Academic Search

On the basis of a high bootstrap current fraction observation with JT-60, the concept of a Steady-State Tokamak Reactor, the SSTR, was conceived and was developed with the design activity of the SSTR at JAERI (Japan Atomic Energy Research Institue). Results of ITER\\/FER (International Thermonuclear Experimental Reactor\\/Fusion Experimental Reactor) design activities have enhanced the SSTR design. Moreover, the progress of

A. Oikawa; M. Kikuchi; Y. Seki; S. Nishio; T. Ando; Y. Ohara; T. Takizuka; K. Tani; T. Ozeki; K. Koizumi; M. Azumi; H. Kishimoto; H. Madaramel; B. Ikeda; Y. Suzuki; N. Ueda; T. Kageyama; M. Yamada; T. Mizoguchi; F. Iida; Y. Ozawa; S. Mori; S. Yamazaki; T. Kobayashi; S. Hirata; J. Adachi; K. Shinya; A. Ozaki; H. Takase; S. Kobayashi; M. Asahara; K. Konishi; N. Yokogawa

1991-01-01

433

Superexchange interaction revisited for orthorhombic perovskite manganites RMnO3 (R=rare earth)  

NASA Astrophysics Data System (ADS)

The manganese perovskite oxides RMnO3 ( R= rare-earth element) show the strong interplay between charge, orbital, lattice, and spin degrees of freedom. Depending on rare-earth ions, their magnetic ground state varies from the A-type to E-type antiferromagnetism (AFM) through the spiral ordering and accordingly Mn-O-Mn bonding angles and local octahedral deformations are changed. Moreover, the ferroelectric properties emerge in the case of spiral or E-type RMnO3. In this study, we have studied the magnetic superexchange interaction in RMnO3 based on the microscopic model incorporating the GdFeO3-type octahedral tilting and the Jahn-Teller (JT) distortion. We have found that (i) the account of t2g electrons is essential to describe both the nearest-neighbor (NN) and next-nearest-neighbor (NNN) superexchange interactions, (ii) the JT distortion angle as well as the octahedral tilting and the JT distortion strength is an important factor for the superexchange interactions, and (iii) two NNN interactions in the ab plane are anisotropic but are both antiferromagnetic. We have determined the magnetic-phase diagram of RMnO3 and discussed the magnetic ground states in relation to the experiments.

Kim, Beom Hyun; Min, B. I.

2010-03-01

434

Development of mechanical cryocoolers for the cooling system of the Soft X-ray Spectrometer onboard Astro-H  

NASA Astrophysics Data System (ADS)

Astro-H is the Japanese X-ray astronomy satellite planned for launch in 2014. The Soft X-ray Spectrometer (SXS) onboard Astro-H, is a high energy resolution spectrometer utilizing an X-ray micro-calorimeter array, which is operated at 50 mK by the ADR with the 30-L superfluid liquid helium (LHe). The mechanical cryocoolers, 4 K-class Joule Thomson (JT) cooler and 20 K-class double-staged Stirling (2ST) cooler are key components to achieve a LHe lifetime for over 3 years in orbit (5 years as a goal). Based on the existing cryocoolers onboard Akari (2006) and JEM/SMILES (2009), modifications for higher cooling power and reliability had been investigated. In the present development phase, the Engineering Models (EMs) of these upgraded cryocoolers are fabricated to carry out verification tests for cooling performance, mechanical performance and lifetime. Nominal cooling power of 200 mW at 20 K for the 2ST cooler and 40 mW at 4.5 K for the JT cooler were demonstrated with temperature and power margin. Mechanical performance test for the 2ST cooler units proves tolerability for pyro shock and vibration environment of the Astro-H criteria. Continuous running of the 4 K-class JT cooler combined with the 2ST precooler for lifetime test has achieved over 5000 h without any degradation of cooling performance.

Sato, Yoichi; Shinozaki, Keisuke; Sugita, Hiroyuki; Mitsuda, Kazuhisa; Yamasaki, Noriko Y.; Takei, Yoh; Nakagawa, Takao; Fujimoto, Ryuichi; Murakami, Masahide; Tsunematsu, Shoji; Otsuka, Kiyomi; Yoshida, Seiji; Kanao, Kenichi; Narasaki, Katsuhiro; ASTRO-H Sxs Team

2012-04-01

435

The Liquefaction of Hydrogen and Helium Using Small Coolers  

SciTech Connect

This report discusses the history of the liquefaction of hydrogen and helium using small coolers. This history dates form the 1960's when two stage GM coolers capable of reaching 7 K were used to liquefy helium and hydrogen by suing an added compressor and J-T circuit. Liquefaction using the added circuit failed to become mainstream because the J-T valve and heat exchanger clogged because of impurities in the gas being liquefied. Liquefaction using a GM cooler without an added J-T circuit proved to be difficult because the first stage was not used to pre-cool the gas coming to the second stage of the cooler. Once the gas being liquefied was pre-cooled using the cooler first stage, improvements in the liquefaction rates were noted. The advent of low temperature pulse tube cooler (down to 2.5 K) permitted one to achieve dramatic improvement is the liquefactions rates for helium. Similar but less dramatic improvements are expected for hydrogen as well. Using the PT-415 cooler, one can expect liquefaction rates of 15 to 20 liters per day for helium or hydrogen provided the heat leak into the cooler and the storage vessel is low. A hydrogen liquefier for MICE is presented at the end of this report.

Green, Michael A.

2006-02-12

436

Identification of de novo germline mutations in the HRPT2 gene in two apparently sporadic cases with challenging parathyroid tumor diagnoses.  

PubMed

The diagnosis of parathyroid carcinomas is often difficult. HRPT2 mutations have been identified in familial [hyperparathyroidism-jaw tumor (HPT-JT) syndrome] and sporadic parathyroid carcinomas, supporting that HRPT2 mutations may confer a malignant potential to parathyroid tumors. In this study, we report the clinical, histopathological, and genetic investigation of two unrelated cases, whom had apparently sporadic malignant parathyroid tumors, initially diagnosed as adenomas. In one case, the differential diagnosis was complicated by cervical seeding of parathyroid tumor cells. Genetic studies identified de novo HRPT2 germline mutations in cases 1 (c.518_521delTGTC [p.Ser174LysfsX27]) and 2 (c.226 C?>?T [p.Arg76X]), unveiling the hereditary HPT-JT syndrome in both patients. Furthermore, the identification of somatic mutations in the patients? parathyroid tumors provided evidence for complete inactivation of the HRPT2 gene, which was consistent with the tumor malignant features. The sensitivity of parafibromin immunostaining to detect HRPT2 mutations was limited. The present data suggests that patients with apparently sporadic parathyroid carcinomas, or parathyroid tumors with atypical histological features, should undergo molecular genetic testing, as it may detect germline HRPT2 mutations. Establishing the diagnosis of hereditary HPT-JT syndrome is relevant for clinical counseling and management of the carriers and their relatives. PMID:21360064

Cavaco, Branca Maria; Santos, Rita; Félix, Ana; Carvalho, Davide; Lopes, José Manuel; Domingues, Rita; Sirgado, Marta; Rei, Nádia; Fonseca, Fernando; Santos, Jorge Rosa; Sobrinho, Luís; Leite, Valeriano

2011-03-01

437

Proceedings of the 7th International Cryocooler Conference, part 2  

NASA Astrophysics Data System (ADS)

Partial contents include: SDIO and Air Force Cryocooler Technology Developments at USAF Phillips Laboratory; JPL Cryocooler Development and Test Program Overview; Development and Demonstration of a Diaphragm Stirling 65 K Standard Spacecraft Cryocooler; Stirling Space Cooler; Thermal, Vibration, and Reliability Test Results for a Balanced 80 K Cryocooler; Spacecraft Cooler Characterization; Performance of a Long Life Reverse Brayton Cryocooler; SDI Cryocooler Producibility Program; Miniature Pulse Tube Cooler; Flow Patterns Intrinsic to the Pulse Tube Refrigerator; Experimental Investigation of the Regenerative Magnetic Refrigerator Operating Between 4.2 K and 1.8 K; A 4 K Gifford-McMahon Refrigerator for Radio Astronomy; A Stirling Cycle Cryocooler for 4 K Applications; Regenerator Performance and Refrigeration Mechanism for 4 K GM Refrigerator Using Rare Earth Compound Regenerator Materials; Superfluid Stirling Refrigerator with a Counterflow Regenerator; Graded and Nongraded Regenerator Performance; Evolution of the 10 K Periodic Sorption Refrigerator Concept; Development of a Periodic 10 K Sorption Cryocooler; Assessment of a Hydrogen Joule-Thomson Expander and Vanadium Hydride Sorption Beds for 20 K Cryocoolers; Design of a Metal Hydride Sorption Cryocooler System; Linear Compressor for JT Cryocooler; JT Cryostat with Liquid-Solid Cryogen Reservoir; Design of A Metal Hydride Sorption Cryocooler System; Linear Compressor for JT Cooler; Phase Equilibria in Cryogenic Mixtures.

1993-04-01

438

The 7th International Cryocooler Conference  

NASA Astrophysics Data System (ADS)

The partial contents of this document include the following: SDIO and Air Force Cryocooler Technology Developments at USAF Phillips Laboratory; JPL Cryocooler Development and Test Program Overview; Development and Demonstration of a Diaphragm Stirling 65 K Standard Spacecraft Cryocooler; Stirling Space Cooler; Thermal, Vibration, and Reliability Test Results for a Balanced 80 K Cryocooler; Spacecraft Cooler Characterization; Performance of a Long Life Reverse Brayton Cryocooler; SDI Cryocooler Producibility Program; Miniature Pulse Tube Cooler; Flow Patterns Intrinsic to the Pulse Tube Refrigerator; Experimental Investigation of the Regenerative Magnetic Refrigerator Operating Between 4.2 K and 1.8 K; A 4 K Gifford-McMahon Refrigerator for Radio Astronomy; A Stirling Cycle Cryocooler for 4 K Applications; Regenerator Performance and Refrigeration Mechanism for 4 K GM Refrigerator Using Rare Earth Compound Regenerator Materials; Superfluid Stirling Refrigerator with a Counterflow Regenerator; Graded and Nongraded Regenerator Performance; Evolution of the 10 K Periodic Sorption Refrigerator Concept; Development of a Periodic 10 K Sorption Cryocooler; Assessment of a Hydrogen Joule-Thomson Expander and Vanadium Hydride Sorption Beds for 20 K Cryocoolers; Design of a Metal Hydride Sorption Cryocooler System; Linear Compressor for JT Cryocooler; JT Cryostat with Liquid-Solid Cryogen Reservoir; Design of A Metal Hydride Sorption Cryocooler System; Linear Compressor for JT Cooler; and Phase Equilibria in Cryogenic Mixtures.

1993-04-01

439

Proceedings of the 7th International Cryocooler Conference, part 1  

NASA Astrophysics Data System (ADS)

Partial contents include: SDIO and Air Force Cryocooler Technology Developments at USAF Phillips Laboratory; JPL Cryocooler Development and Test Program Overview; Development and Demonstration of a Diaphragm Stirling 65 K Standard Spacecraft Cryocooler; Stirling Space Cooler; Thermal, Vibration, and Reliability Test Results for a Balanced 80 K Cryocooler; Spacecraft Cooler Characterization; Performance of a Long Life Reverse Brayton Cryocooler; SDI Cryocooler Producibility Program; Miniature Pulse Tube Cooler; Flow Patterns Intrinsic to the Pulse Tube Refrigerator; Experimental Investigation of the Regenerative Magnetic Refrigerator Operating Between 4.2 K and 1.8 K; A 4 K Gifford-McMahon Refrigerator for Radio Astronomy; A Stirling Cycle Cryocooler for 4 K Applications; Regenerator Performance and Refrigeration Mechanism for 4 K GM Refrigerator Using Rare Earth Compound Regenerator Materials; Superfluid Stirling Refrigerator with a Counterflow Regenerator; Graded and Nongraded Regenerator Performance; Evolution of the 10 K Periodic Sorption Refrigerator Concept; Development of a Periodic 10 K Sorption Cryocooler; Assessment of a Hydrogen Joule-Thomson Expander and Vanadium Hydride Sorption Beds for 20 K Cryocoolers; Design of a Metal Hydride Sorption Cryocooler System; Linear Compressor for JT Cryocooler; JT Cryostat with Liquid-Solid Cryogen Reservoir; Design of A Metal Hydride Sorption Cryocooler System; Linear Compressor for JT Cooler; Phase Equilibria in Cryogenic Mixtures.

1993-04-01

440

Proceedings of the 7th International Cryocooler Conference, part 3  

NASA Astrophysics Data System (ADS)

Partial contents include: SDIO and Air Force Cryocooler Technology Developments at USAF Phillips Laboratory; JPL Cryocooler Development and Test Program Overview; Development and Demonstration of a Diaphragm Stirling 65 K Standard Spacecraft Cryocooler; Stirling Space Cooler; Thermal, Vibration, and Reliability Test Results for a Balanced 80 K Cryocooler; Spacecraft Cooler Characterization; Performance of a Long Life Reverse Brayton Cryocooler; SDI Cryocooler Producibility Program; Miniature Pulse Tube Cooler; Flow Patterns Intrinsic to the Pulse Tube Refrigerator; Experimental Investigation of the Regenerative Magnetic Refrigerator Operating Between 4.2 K and 1.8 K; A 4 K Gifford-McMahon Refrigerator for Radio Astronomy; A Stirling Cycle Cryocooler for 4 K Applications; Regenerator Performance and Refrigeration Mechanism for 4 K GM Refrigerator Using Rare Earth Compound Regenerator Materials; Superfluid Stirling Refrigerator with a Counterflow Regenerator; Graded and Nongraded Regenerator Performance; Evolution of the 10 K Periodic Sorption Refrigerator Concept; Development of a Periodic 10 K Sorption Cryocooler; Assessment of a Hydrogen Joule-Thomson Expander and Vanadium Hydride Sorption Beds for 20 K Cryocoolers; Design of a Metal Hydride Sorption Cryocooler System; Linear Compressor for JT Cryocooler; JT Cryostat with Liquid-Solid Cryogen Reservoir; Design of A Metal Hydride Sorption Cryocooler System; Linear Compressor for JT Cooler; Phase Equilibria in Cryogenic Mixtures.

1993-04-01

441

High Resolution Cavity Ring Down Spectroscopy of the 3^{1}_{0} and 3^{1}_{0} 4^{1}_{0} Bands of the ˜{A}^2E^'' State of NO_3 Radical  

NASA Astrophysics Data System (ADS)

The NO_3 radical is expected to exhibit a Jahn-Teller (JT) effect in its degenerate ˜{A}^2E^'' electronic state. In the ˜{A} state there are two JT active modes, ?_3 and ?_4 (e^' stretch and in-plane bend respectively). Theoretical work has predicted that the JT effect in the ˜{A} state should be quite strong and approach the static case where the molecule is permanently distorted to a lower symmetry geometry. A more comprehensive understanding of its structure can be achieved using high resolution rotationally resolved absorption spectroscopy of its different vibronic bands. The high resolution absorption spectra of 3^{1}_{0} and 3^{1}_{0} 4^{1}_{0} vibronic bands of the ˜{A} ^2E^'' excited state of NO_3 have been successfully recorded for the first time using our jet cooled cavity ring down apparatus. These parallel bands are vibronically allowed transitions and shows the same contour. An oblate symmetric top model Hamiltonian including both centrifugal distortion and spin rotation terms is used to analyze the spectrum. The rotational analysis of this band, supported by combination differences, demonstrate the existence of doubled lines as were observed for 4^{n}_{0} (n=1,3) bands. E. Hirota, T. Ishiwata, K. Kawaguchi, M. Fujitake, N. Ohashi, and I. Tanaka, J. Chem. Phys., {107}, 2829, 1997. Roudjane, M. et al. 67{^{th}} OSU International Symposium on Molecular Spectroscopy, The Ohio State University, Columbus, Ohio, 2011, talk TI-03.

Roudjane, Mourad; Codd, Terrance J.; Miller, Terry A.

2013-06-01

442

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

443

A Si/Glass Bulk-Micromachined Cryogenic Heat Exchanger for High Heat Loads: Fabrication, Test, and Application Results.  

PubMed

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 x 1-cm(2) footprint and a length of up to 3.5 cm. It is intended for use in Joule-Thomson (J-T) coolers and can sustain pressure exceeding 1 MPa. Tests at cold-end inlet temperatures of 237 K-252 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 K-296 K but remain usable at lower temperatures. In self-cooling tests with ethane as the working fluid, a J-T 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 J-T 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 300-500 mW. PMID:20490284

Zhu, Weibin; White, Michael J; Nellis, Gregory F; Klein, Sanford A; Gianchandani, Yogesh B

2010-02-01

444

Development of imaging bolometers for magnetic fusion reactors (invited)  

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, 256×360 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 cm×9 cm×5 ?m tantalum. A noise equivalent power density of 300 ?W/cm2 is achieved with 40×24 channels and a time response of 10 ms or 23 ?W/cm2 for 16×12 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

445

Valence and spin states in delafossite AgNiO2 and the frustrated Jahn-Teller system ANiO2 (A=Li,Na)  

NASA Astrophysics Data System (ADS)

Electronic structures of delafossite oxides AgNi1-xCoxO2 and the frustrated Jahn-Teller (JT) system ANiO2 (A=Li,Na) have been investigated by employing soft x-ray absorption spectroscopy and photoemission spectroscopy (PES). It is found that Ni ions are in the Ni2+-Ni3+ mixed-valent states and that the low-spin (LS) Ni3+ component increases from LiNiO2 to AgNiO2 and NaNiO2 , in agreement with the presence of the JT transition in NaNiO2 and the absence of the JT transition in LiNiO2 and AgNiO2 . In AgNi1-xCoxO2 , the Ni3+ component increases with x , while Co ions are in the LS Co3+ states for all x , which is consistent with the metallic nature for low values of x . A good agreement is found between the measured PES spectra and the calculated local spin density approximation (LSDA) electronic structures of AgNiO2 and AgCoO2 , but the pseudogap feature in PES of AgNiO2 is not described by the LSDA.

Kang, J.-S.; Lee, S. S.; Kim, G.; Lee, H. J.; Song, H. K.; Shin, Y. J.; Han, S. W.; Hwang, C.; Jung, M. C.; Shin, H. J.; Kim, B. H.; Kwon, S. K.; Min, B. I.

2007-11-01

446

OPTIMIZATION OF A TWO-STAGE ADR FOR THE SOFT X-RAY SPECTROMETER (SXS) INSTRUMENT ON THE ASTRO-H MISSION  

SciTech Connect

NASA/Goddard Space Flight Center has begun developing the Soft X-ray Spectrometer (SXS) instrument that will be flown on the Japanese Astro-H mission. The SXS's 36-pixel detector array will be cooled to 50 mK using a two-stage adiabatic demagnetization refrigerator (ADR). A complicating factor for its design is that the ADR will be integrated into a superfluid helium dewar at 1.3 K that will be coupled to a 1.8 K Joule-Thomson (JT) stage through a heat switch. When liquid helium is present, the coupling will be weak, and the JT stage will act primarily as a shield to reduce parasitic heat loads. When the liquid is depleted, the heat switch will couple more strongly so that the ADR can continue to operate using the JT stage as its heat sink. A two-stage ADR is the most mass efficient option and it has the operational flexibility to work well with a stored cryogen and a cryocooler. The stages are operated independently, and this opens up a very large parameter space for optimizing the design. This paper discusses the optimization process and most relevant trades considered in the design of the SXS ADR, and its expected performance.

Shirron, P. J.; Kimball, M. O.; Wegel, D. C. [NASA/Goddard Space Flight Center, Greenbelt, MD, 20771 (United States); Miller, F. K. [University of Wisconsin, Dept. of Mech. Eng., Madison, WI, 53715 (United States)

2010-04-09

447

NGST Advanced Cryocooler Technology Development Program (ACTDP) Cooler System  

NASA Astrophysics Data System (ADS)

The NGST ACTDP cooler features a 5-6 K Joule-Thomson (JT) cooler pre-cooled by a three-stage Pulse Tube (PT) cryocooler. Our design provides remote cooling of ~60 mW at 5 to 6 K and, optionally, remote cooling at 18 K. The NGST ACTDP cooler is being developed under contract with the Jet Propulsion Laboratory to enable active cooling of instruments including large space telescopes, in particular the Mid InfraRed Instrument (MIRI) of the James Webb Space Telescope (JWST). This paper describes the design of the NGST ACTDP cooler and presents test results, including the integrated tests of the two major subsystems making up the thermal-mechanical cryocooler, the closed loop JT cooler and the PT pre-cooler. Both the JT and PT subsystems have been demonstrated to provide the cooling required for MIRI in laboratory tests using flight like hardware with excess capacity. These tests enable a reliable projection of the total electrical power of the NGST MIRI cooler of 200-296 W for steady state operation under end of life conditions, depending on the margins added to the thermal loads and parasitics. NGST's design offers a low risk approach to providing cooling of MIRI making maximum use of flight proven hardware.

Durand, D.; Raab, J.; Colbert, R.; Michaelian, M.; Nguyen, T.; Petach, M.; Tward, E.

2006-04-01

448

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 Joule–Thomson (J–T) coolers and can sustain pressure exceeding 1 MPa. Tests at cold-end inlet temperatures of 237 K–252 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 K–296 K but remain usable at lower temperatures. In self-cooling tests with ethane as the working fluid, a J–T 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 J–T 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 300–500 mW.

Zhu, Weibin; White, Michael J.; Nellis, Gregory F.; Klein, Sanford A.; Gianchandani, Yogesh B.

2010-01-01

449

The Astro-H Soft X-ray Spectrometer (SXS)  

SciTech Connect

The Soft-X-ray Spectrometer (SXS) is a high spectral resolution, cryogenic x-ray spectrometer that will fly on the Japan/U.S. Astro-H observatory in 2014. The SXS is composed of a 36 pixel, imaging, x-ray calorimeter array that will operate at 0.05 K utilizing a 2-stage adiabatic demagnetization refrigerator and a redundant pre-cooler design using both a 40 liter liquid helium tank and a 1.7 K Joule-Thomson (JT) cryocooler. Additional redundant Stirling cycle coolers provide pre-cooling for the (JT) and cool the outer thermal shields for the JT and the helium tank. The detector system, while similar to that flown on Suzaku, is composed of larger 0.81x0.81mm pixels, but has significantly better performance, currently predicted to be better than 4 eV FWHM at 6 keV with 95% quantum efficiency. This instrument is the result of a close collaboration between many institutions in the U.S. and Japan over the last 25 years. Here we will present an overview of the SXS instrument, the SXS cooling system, and recent laboratory improvements to the detector system.0.

Porter, F. Scott; Kelley, Richard L.; Kilbourne, Caroline A. [NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States); Fujimoto, Ryuichi [Kanazawa University, Kanazawa 920-1192 (Japan); Mitsuda, Kazuhiasa [Institute of Space and Astronautical Science, JAXA, Sagamihara 229-8510 (Japan); Ohashi, Takaya [Tokyo Metropolitan University, Hachioji, Tokyo 192-0397 (Japan); Kanazawa University, Kanazawa 920-1192 (Japan) and Institute of Space and Astronautical Science, JAXA, Sagamihara 229-8510 (Japan) and Tokyo Metropolitan University, Hachioji, Tokyo 192-0397 (Japan); University of Wisconsin, Madison, WI 53706 (United States) and Aerospace Research and Development Directorate, JAXA, Tuskuba 305-8505 (Japan); Yale University, New Haven, CT 06520 (United States); University of Tsukuba, Tsukuba 305-8573 (Japan); Saitama University Saitama 338-8570 (Japan); RIKEN, Waco 351-0198 (Japan); Rikkyo University, Tokyo 171-8501 (Japan); SRON, 3584 CA Utrecht (Netherlands); Lawrence Livermore National Laboratory, Livermore, CA 94550 (United States)

2009-12-16

450

Optimization of a Two-Stage Adr for the Soft X-Ray Spectrometer (sxs) Instrument on the Astro-H Mission  

NASA Astrophysics Data System (ADS)

NASA/Goddard Space Flight Center has begun developing the Soft X-ray Spectrometer (SXS) instrument that will be flown on the Japanese Astro-H mission. The SXS's 36-pixel detector array will be cooled to 50 mK using a two-stage adiabatic demagnetization refrigerator (ADR). A complicating factor for its design is that the ADR will be integrated into a superfluid helium dewar at 1.3 K that will be coupled to a 1.8 K Joule-Thomson (JT) stage through a heat switch. When liquid helium is present, the coupling will be weak, and the JT stage will act primarily as a shield to reduce parasitic heat loads. When the liquid is depleted, the heat switch will couple more strongly so that the ADR can continue to operate using the JT stage as its heat sink. A two-stage ADR is the most mass efficient option and it has the operational flexibility to work well with a stored cryogen and a cryocooler. The stages are operated independently, and this opens up a very large parameter space for optimizing the design. This paper discusses the optimization process and most relevant trades considered in the design of the SXS ADR, and its expected performance.

Shirron, P. J.; Kimball, M. O.; Wegel, D. C.; Miller, F. K.

2010-04-01

451

The effects of the N atom collective Lamb shift on single photon superradiance  

NASA Astrophysics Data System (ADS)

The problem of single photon collective spontaneous emission, a.k.a. superradiance, from N atoms prepared by a single photon pulse of wave vector k has been the subject of recent interest. It has been shown that a single photon absorbed uniformly by the N atoms will be followed by spontaneous emission in the same direction [M. Scully, E. Fry, C.H.R. Ooi, K. Wodkiewicz, Phys. Rev. Lett. 96 (2006) 010501; M. Scully, Laser Phys. 17 (2007) 635]; and in extensions of this work we have found a new kind of cavity QED in which the atomic cloud acts as a cavity containing the photon [A.A. Svidzinsky, J.T. Chang, M.O. Scully, Phys. Rev. Lett. 100 (2008) 160504]. In most of our studies, we have neglected virtual photon (“Lamb shift”) contributions. However, in a recent interesting paper, Friedberg and Mannassah [R. Friedberg, J.T. Manassah, Phys. Lett. A 372 (2008) 2514] study the effect of virtual photons investigating ways in which such effects can modify the time dependence and angular distributions of collective single photon emission. In the present Letter, we show that such virtual transitions play no essential role in our problem. The conclusions of [M. Scully, E. Fry, C.H.R. Ooi, K. Wodkiewicz, Phys. Rev. Lett. 96 (2006) 010501; M. Scully, Laser Phys. 17 (2007) 635; A.A. Svidzinsky, J.T. Chang, M.O. Scully, Phys. Rev. Lett. 100 (2008) 160504] stand as published. However, the N atom Lamb shift is an interesting problem in its own right and we here extend previous work both analytically and numerically.

Scully, Marlan O.; Svidzinsky, Anatoly A.

2009-03-01

452

Neutron-diffraction study of structural transition and magnetic order in orthorhombic and rhombohedral La7/8Sr1/8Mn1-?O3+?  

NASA Astrophysics Data System (ADS)

We report on a systematic neutron powder diffraction (NPD) study of polycrystalline La7/8Sr1/8Mn1-?O3+? compounds. We investigated the structural and magnetic phases and transitions in the temperature range between 10 and 900 K for two different samples: an Ar-annealed sample with an orthorhombic Pbnm (Z = 4; O) structure at room temperature and an air-sintered sample with a rhombohedral R\\bar {3}c (Z = 2;R) structure at room temperature. At higher temperatures, above 400 K, both samples exhibit a rhombohedral structure. For the Ar-annealed sample, a Jahn-Teller (JT) transition occurs in the orthorhombic phase at about 298 K with very large variations in the Mn-O2' and Mn-O2 bond lengths and Mn-O1-Mn bond angle on cooling from 298 to 180 K. For this sample the ferromagnetic moment at 10 K in the magnetic space group Pb'n'm amounts to 3.22(5) ?B/Mn. In contrast, the air-sintered sample undergoes on cooling a structural transition from rhombohedral (R) to orthorhombic (O) with a mixed phase of nearly equal R and O repartition at 120 K. Ferromagnetic order develops in this sample at about 240 K with a low-temperature moment of 3.35(4) ?B/Mn at 10 K. The coherent JT distortion in its orthorhombic phase occurs below some 170 K. In addition, we have determined the coherent JT distortion parameter ?, the tolerance factor t and the one-electron bandwidth W of the eg-band.

Li, H. F.; Su, Y.; Persson, J.; Meuffels, P.; Walter, J. M.; Skowronek, R.; Brückel, Th

2007-04-01

453

A Kinematical Approach to Dark Energy Studies  

SciTech Connect

We present and employ a new kinematical approach to cosmological ''dark energy'' studies. We construct models in terms of the dimensionless second and third derivatives of the scale factor a(t) with respect to cosmic time t, namely the present-day value of the deceleration parameter q{sub 0} and the cosmic jerk parameter, j(t). An elegant feature of this parameterization is that all {Lambda}CDM models have j(t) = 1 (constant), which facilitates simple tests for departures from the {Lambda}CDM paradigm. Applying our model to the three best available sets of redshift-independent distance measurements, from type Ia supernovae and X-ray cluster gas mass fraction measurements, we obtain clear statistical evidence for a late time transition from a decelerating to an accelerating phase. For a flat model with constant jerk, j(t) = j, we measure q{sub 0} = -0.81 {+-} 0.14 and j = 2.16{sub -0.75}{sup +0.81}, results that are consistent with {Lambda}CDM at about the 1{sigma} confidence level. A standard ''dynamical'' analysis of the same data, employing the Friedmann equations and modeling the dark energy as a fluid with an equation of state parameter, w (constant), gives {Omega}{sub m} = 0.306{sub -0.040}{sup +0.042} and w = -1.15{sub -0.18}{sup +0.14}, also consistent with {Lambda}CDM at about the 1{sigma} level. In comparison to dynamical analyses, the kinematical approach uses a different model set and employs a minimum of prior information, being independent of any particular gravity theory. The results obtained with this new approach therefore provide important additional information and we argue that both kinematical and dynamical techniques should be employed in future dark energy studies, where possible. Our results provide further interesting support for the concordance {Lambda}CDM paradigm.

Rapetti, David; Allen, Steven W.; Amin, Mustafa A.; Blandford, Roger D.; /KIPAC, Menlo Park

2006-06-06

454

Effect of Er substitution on ultrasonic anomaly in Dy(0.5-x)Er(x)Ba(0.5)CoO3 cobaltates.  

PubMed

Rare-earth cobaltates Dy0.5-xErxBa0.5CoO3 (x=0, 0.03 and 0.05) have been systematically investigated to elucidate the effect of Er substitution on elastic as well as magnetic and transport properties. DC electrical resistance and AC susceptibility measurements showed that the x=0 sample exhibited an insulating behavior and an anti-ferromagnetic (AFM) transition, TN at 198 K as well as ferromagnetic (FM) transition, TC at 260 K. Increasing of Er content suppressed the FM and AFM state suggestively due to the increase in size disorder arising from the size mismatch between A-site cations as shown from our calculation of variance ?(2). On the other hand, both absolute longitudinal and shear velocities and related elastic moduli measured at 210 K decreased with Er content in conjunction with the declining in the FM domain indicating a weakening in elastic properties. A longitudinal velocity anomaly characterized by a drop in velocity upon cooling before hardening with further cooling was observed for all samples. This abnormal elastic anomaly can be attributed due to the Jahn-Teller (JT) distortion of intermediate-spin Co(3+) ions. Analysis of the elastic anomaly using the mean-field theory suggested that it is related to the JT effect which transformed from dynamic to static type with decreasing temperature. The elastic anomaly shifted to lower temperature from 129 K (x=0) to 124 K (x=0.05) with Er substitution indicating a weakening of the static JT effect. PMID:23497912

Shamsuddin, S; Ibrahim, Abdel-Baset M A; Yahya, A K

2013-02-17

455

Anomalies in the applied magnetic fields in DIII-D and their implications for the understanding of stability experiments  

NASA Astrophysics Data System (ADS)

Small non-axisymmetric magnetic fields are known to cause serious loss of stability in tokamaks, leading to loss of confinement and abrupt termination of plasma current (disruptions). The best known examples are the locked mode and the resistive wall mode. Understanding of the underlying field anomalies (departures in the hardware-related fields from ideal toroidal and poloidal fields on a single axis) and the interaction of the plasma with them is crucial to tokamak development. Results of both locked mode experiments (Scoville J.T. and La Haye R.J. 2003 Nucl. Fusion 43 250) and resistive wall mode experiments (Garofalo A.M., La Haye R.J. and Scoville J.T. 2002 Nucl. Fusion 42 1335) done in DIII-D tokamak plasmas have been interpreted to indicate the presence of a significant anomalous field. New measurements of the magnetic field anomalies of the hardware systems have been made in DIII-D. The measured field anomalies due to the plasma shaping coils in DIII-D are smaller than previously reported (La Haye R.J. and Scoville J.T. 1991 Rev. Sci. Instrum. 61 2146). Additional evaluations of systematic errors have been made. New measurements of the anomalous fields of the Ohmic heating and toroidal coils have been added. Such detailed in situ measurements of the fields of a tokamak are unique. The anomalous fields from all the coils are one-third the values indicated from the stability experiments (Garofalo et al 2002, Scoville and La Haye 2003). These results indicate limitations in the understanding of the interaction of the plasma with the external field. They indicate that it may not be possible to deduce the anomalous fields in a tokamak from plasma experiments and that we may not have the basis needed to project the error field requirements of future tokamaks.

Luxon, J. L.; Schaffer, M. J.; Jackson, G. L.; Leuer, J. A.; Nagy, A.; Scoville, J. T.; Strait, E. J.

2003-12-01

456

High Resolution Jet Cooled Cavity Ringdown Spectroscopy of the tilde{A} State 31_0 Band of the NO_3 Radical  

NASA Astrophysics Data System (ADS)

The 2E''tilde{A} state of NO_3 is doubly degenerate and is therefore subject to Jahn-Teller (JT) distortion. In the tilde{A} state there are two JT active modes, ?_3 and ?_4 (e' stretch and in plane bend respectively). Theoretical work has predicted that the JT effect in the tilde{A} state should be quite strong and approach the static case (D?1) where the molecule is permanently distorted to a lower symmetry geometry. A moderate resolution spectrum of the tilde{A} state showed a feature that we tentatively assigned as the 31_0 band based on position and band contour. Using high resolution cavity ringdown spectroscopy we have now obtained a rotationally resolved spectrum of this band. The analysis of this band has been commenced using an oblate symmetric top Hamiltonian with spin-rotation terms. This analysis supports the assignment of this band to the a_1'' vibronic component of the 31_0 band. So far, the spectrum shows no evidence of a large geometric distortion of the molecule. Some lines appear to be split, as was previously observed in the 41_0 and 42_0 bands, and the possible sources of this splitting are being investigated. J.F. Stanton, 66th OSU International Symposium on Molecular Spectroscopy, The Ohio State University, Columbus Ohio, 2011, TJ-03 W. Eisfeld, K. Morokuma, J. Chem. Phys. 114, 9430 (2001) S. Faraji, H. Köppel, W. Eisfeld, S. Mahapatra, J. Chem. Phys. 347, 110 (2008) T.J. Codd, M.W. Chen, T.A. Miller, 66th OSU International Symposium on Molecular Spectroscopy, The Ohio State University, Columbus Ohio, 2011, TD-06 M.W. Chen, T.J. Codd, G. Just, T.A. Miller, OSU International Symposium on Molecular Spectroscopy, The Ohio State University, Columbus Ohio, 2011, TD-07

Codd, Terrance J.; Roudjane, Mourad; Miller, Terry A.

2012-06-01

457

Realization of the 3He Vapor-Pressure Temperature Scale and Development of a Liquid-He-Free Calibration Apparatus  

NASA Astrophysics Data System (ADS)

The 3He vapor-pressure temperature scale was realized using an apparatus based on a continuously operating 3He cryostat at the National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST). The cryostat has two operational modes: a 3He circulation mode and a 1 K pot mode. The 3He circulation mode can be used for 3He vapor-pressure measurements below 1.6 K, and the 1 K pot mode can be used for measurements above 1.3 K. Either mode can be selected for measurements from 1.3 K to 1.6 K. The realization of the 3He vapor-pressure temperature scale in this study fully covers its defined temperature range from 0.65 K to 3.2 K in the International Temperature Scale of 1990. The latest realization results are presented in this article. In addition, a liquid-He-free calibration apparatus was developed. It does not require liquid helium as a cryogen, which usually entails cumbersome handling and periodic refilling. The apparatus was designed for the calibration of capsule-type resistance thermometers from 0.65 K to 24.5561 K (the triple point of neon). The cooling system of the apparatus consists of a commercially available pulse-tube refrigerator and a 3He Joule-Thomson (JT) cooling circuit developed at NMIJ/AIST. The pulse-tube refrigerator is used in a pre-cooling stage and cools the apparatus to approximately 5 K. The 3He JT cooling circuit is used to cool the apparatus from 5 K to below 0.65 K. Since the 3He JT cooling circuit is a closed circuit, the apparatus can run continuously with only simple maintenance required. The basic characteristics of the apparatus are described.

Shimazaki, T.; Toyoda, K.; Tamura, O.

2011-12-01

458

Thermorheological Complexity in Polystyrene Melt  

NASA Astrophysics Data System (ADS)

Using the successful description of creep compliance J(t) of nearly monodisperse polystyrene melts^1 in terms of the extended reptation theory^2 (ERT) in the rubber(like)-fluid region as the reference frame in time, the analysis of the glassy-relaxation process AGuG(t) that occurs in the short-time region of J(t) in terms of a stretched exponential form incorporated into ERT reveals that the temperature dependence of the AGuG(t) process being stronger in a simple manner than that of the entropy-derived ERT processes accounts fully for the uneven thermorheological complexity in the J(t). The results being displayed in the modulus G(t) form, it is shown that at Tg, the contribution from AGuG(t) to G(t) at the time scale corresponding to the highest Rouse-Mooney normal mode greatly exceeds that derived from entropy, indicating vitrification at the Rouse-segmental level. At the same time the Rouse-Mooney normal modes provide an internal yardstick for estimating the length scale of the polymer at Tg, giving 3 nm for polystyrene. Based on the obtained results, the basic mechanism for the thermorheological complexity is analysed, showing that the break-down of Stoke-Einstein relation in glass-forming liquids, such as OTP, should occur for a similar reason. Ref: (1) D. J. Plazek, J. Phys. Chem. 1965, 69, 3480; J. Polym. Sci. A-2 1968, 6, 621. (2) Y.-H. Lin, Macromolecules 1984, 17, 2846; 1986, 19, 159; 168; 1987, 20, 885; 1999, 32, 181; Polymer Viscoelasticity: Basics, Molecular Theories and Experiments; World Scientific: Singapore, 2003.

Lin, Yn-Hwang

2005-03-01

459

Neutron diffraction, magnetization, and ESR studies of pseudocubic Nd{sub 0.75}Ba{sub 0.25}MnO{sub 3} and its critical behavior above T{sub C}  

SciTech Connect

Results of structural neutron diffraction study, magnetization, and electron spin resonance (ESR) measurements are presented for insulating Nd{sub 1-x}Ba{sub x}MnO{sub 3}(x=0.25) with the Curie temperature T{sub C}{approx_equal}129 K. Detailed analysis of the data is performed by using Pbnm space group in a temperature range 4.2-300 K. The compound is found to exhibit the Jahn-Teller (JT) transition at T{sub JT}{approx}250 K. The character of the coherent JT distortions and their temperature evolution differ from those of the x=0.23 manganite. The field cooled magnetization data are in reasonable agreement with the predictions for a three-dimensional (3D) isotropic ferromagnet above T{sub C}. These measurements, however, reveal a difference between the field cooled and zero field cooled data in the paramagnetic region. The ESR results also correspond with behavior of a 3D isotropic ferromagnet above T*{approx_equal}143 K[{tau}*{approx_equal}0.12{<=}{tau}<1,{tau}=(T-T{sub C})/T{sub C}]. The T-dependence of the ESR linewidth is found to be proportional to [T{chi}(T)]{sup -1}, where {chi}(T) is the susceptibility. This uncritical behavior results from the anisotropic spin interactions that can be attributed to the Dzyaloshinsky-Moria (DM) coupling. The critical enhancement is not observed. It can be explained by the strong uncritical contribution to the linewidth, and suppression of the critical enhancement by a magnetic field. The different temperature treatments (slow/fast cooling/heating, with/without external magnetic field) of the sample reveal a temperature hysteresis of the ESR spectra below T* indicating an anomalous response in the paramagnetic region. The study of the magnetic phase transition in the x=0.23 and 0.25 manganites suggests change in its character from second to first order at T*. The conventional free energy including the magnetization and magnetic field is not found to describe this first order transition. This suggests that the charge, orbital, and JT phonon degrees of freedom, in addition to magnetization, may be the critical variables, the unusual character of the transition being determined by their coupling. The unconventional critical behavior is attributed to an orbital liquid metallic phase that begins to coexist with the initial orbital ordered phase below T*.

Ryzhov, V.A.; Lazuta, A.V.; Smirnov, O.P.; Kiselev, I.A.; Chernenkov, Yu.P.; Borisov, S.A.; Troaynchuk, I.O.; Khalyavin, D.D. [Petersburg Nuclear Physics Institute, Gatchina, Leningrad District, 188300 (Russian Federation); Institute of Physics of Solids and Semiconductors, National Academy of Sciences, ul. P. Brovki street 17, Minsk, 220072 (Belarus)

2005-10-01

460

Systematic scaling in the low-energy excitations of the t-J model in one and two dimensions  

Microsoft Academic Search

We present an exact diagonalization study of the low-energy singlet and triplet states for both the one-dimensional (1D) and 2D t-J models. A scan of the parameter ratio J\\/t shows that for most low-energy states in both 1D and 2D the excitation energy takes the form E(t,J)=a·t+b·J. In 1D this is the natural consequence of the factorization of the low-energy

R. Eder; Y. C. Chen; H. Q. Lin; Y. Ohta; C. T. Shih; T. K. Lee

1997-01-01

461

Small Business Innovations (Cryostat)  

NASA Astrophysics Data System (ADS)

General Pneumatics Corporation, Scottsdale, AZ, developed an anti- clogging cryostat that liquifies gases by expansion for high pressure through a nozzle to produce cryorefrigeration based on their Kennedy Space Center Small Business Innovation Research (SBIR) work to develop a Joule-Thomson (JT) expansion valve that is less susceptible to clogging by particles or condensed contaminants in the flow than a non-contaminating compressor in a closed cycle Linde-Hampson cryocooler used to generate cryogenic cooling for infrared sensors, super conductors, supercooled electronics and cryosurgery.

1991-01-01

462

An experimental and numerical study of librationally driven flow in planetary cores and subsurface oceans  

Microsoft Academic Search

Many planetary bodies undergo forced longitudinal librations [Williams, J.G., Boggs, D.H., Yoder, C.F., Ratcliff, J.T., Dickey, J.O., 2001. Lunar rotational dissipation in solid body and molten core. Journal of Geophysical Research-Planets 106 (E11), 27933–27968; Comstock, R.L., Bills, B.G., 2003. A solar system survey of forced librations in longitude. Journal of Geophysical Research-Planets 108 (E9); Margot, J.L., Peale, S.J., Jurgens, R.F.,

J. Noir; F. Hemmerlin; J. Wicht; S. M. Baca; J. M. Aurnou

2009-01-01

463

Crystalline nucleation in undercooled liquids: A Bayesian data-analysis approach for a nonhomogeneous Poisson process  

NASA Astrophysics Data System (ADS)

A Bayesian data-analysis approach to data sets of maximum undercooling temperatures recorded in repeated melting-cooling cycles of high-purity samples is proposed. The crystallization phenomenon is described in terms of a nonhomogeneous Poisson process driven by a temperature-dependent sample nucleation rate J(T). The method was extensively tested by computer simulations and applied to real data for undercooled liquid Ge. It proved to be particularly useful in the case of scarce data sets where the usage of binned data would degrade the available experimental information.

Filipponi, A.; Di Cicco, A.; Principi, E.

2012-12-01

464

Ultrasonic evaluation of the Jahn-Teller effect parameters. Application to ZnSe:Cr2 +  

NASA Astrophysics Data System (ADS)

A method is constructed that uses ultrasonic experiments to evaluate the parameters of the Jahn-Teller (JT) effect in impurity centers in crystals. The method is based on measurements of temperature dependent attenuation and phase velocity and does not require assumptions about mechanisms of relaxation. The results are illustrated by measurements performed on the impurity system ZnSe:Cr2 + , in which the Cr2 + ion has a threefold degenerate T term in the ground state, subject to the T\\otimes (e+t_2) JT problem. Ultrasound propagation anomalies show that the main JT distortions of the tetrahedral environment of the Cr2 + ion are of tetragonal E type and hence the lowest branch of the adiabatic potential energy surface (APES) is formed in accordance with the T\\otimes e problem. With dopant concentration 3.8 × 1018 cm - 3 the modulus of the constant of linear vibronic coupling to tetragonal E type vibrations is determined by two independent experiments: |FE| = 5.49 × 10 - 5 dyn revealed from attenuation measurements, while a slightly different value |FE| = 5.57 × 10 - 5 dyn emerges from phase velocity measurements. Contributions of other active vibronic modes to the elastic modulus Cl = (C11 + C12 + 2C44)/2 are analyzed and it is shown that the influence of the totally symmetric mode is negligible. Using additional information about this system obtained from independent sources, we also estimated the primary force constant in the E direction (KE?(1.4-4.2) × 104 dyn cm - 1) and orthorhombic and trigonal saddle points of the APES in the five-dimensional space of the tetragonal and trigonal coordinates, their stabilization energies being EJTO?81-450 cm - 1 and EJTT?48-417 cm - 1, respectively (the variations of the KE, EJTO and EJTT values are due to different literature data for EJTE). With these data the APES of the JT linear T\\otimes (e+t_2) problem for the Cr2 + ion in the ZnSe:Cr2 + system is revealed.

Gudkov, V. V.; Bersuker, I. B.; Zhevstovskikh, I. V.; Korostelin, Yu V.; Landman, A. I.

2011-03-01

465

High-beta steady-state research and future directions on the Japan Atomic Energy Research Institute Tokamak60 Upgrade and the Japan Atomic Energy Research Institute Fusion Torus2 Modified  

Microsoft Academic Search

In the Japan Atomic Energy Research Institute Tokamak-60 Upgrade (JT-60U), a high-betap ELMy H-mode (high-poloidal-beta high-confinement-mode with edge localized mode) plasma was sustained with betaN~2.7 for 7.4 s. Real-time neoclassical tearing mode (NTM) stabilization system was established and effective NTM suppression by early electron cyclotron (EC) wave injection was demonstrated. High fusion triple product of ni(0)tauETi(0)=3.1×1020 keV.s.m-3 was achieved using

S. Ishida

2004-01-01

466

Synthesis, stability range and characterization of Pr2Cu2O5  

Microsoft Academic Search

A novel Pr2Cu2O5 phase has been prepared under high-pressure and high-temperature conditions (P ?6 GPa and T ?1673 K) in a Belt-type apparatus and characterized by X-ray diffraction and electron microscopy. The crystal structure appears to be an orthorhombic “oxygen-deficient perovskite” (M.T. Anderson, J.T. Vaughey, and K.R. Poeppelmeier, Structural similarities among oxygen-deficient perovskites, Chem. Mater. 5 (1993), pp. 151–165) isostructural with La2Cu2O5

Javier Fernández-Sanjulián; Emilio Morán; Miguel Ángel Alario-Franco

2010-01-01

467

Proposal of six species of moderately thermophilic, acidophilic, endospore-forming bacteria: Alicyclobacillus contaminans sp. nov., Alicyclobacillus fastidiosus sp. nov., Alicyclobacillus kakegawensis sp. nov., Alicyclobacillus macrosporangiidus sp. nov., Alicyclobacillus sacchari sp. nov. and Alicyclobacillus shizuokensis sp. nov  

Microsoft Academic Search

Moderately thermophilic, acidophilic, spore-forming bacteria (146 strains) were isolated from various beverages and environments. Based on the results of sequence analysis of the hypervariable region of the 16S rRNA gene, eight of the strains represent novel species of the genus Alicyclobacillus. These strains were designated 3-A191T, 4-A336T, 5-A83JT, 5-A167N, 5-A239-2O-AT, E-8, RB718T and S-TABT. Phylogenetic analyses of 16S rRNA and

Keiichi Goto; Kaoru Mochida; Yuko Kato; Mika Asahara; Rieko Fujita; Sun-Young An; Hiroaki Kasai; Akira Yokota

2007-01-01

468

Static Stretching Can Impair Explosive Performance For At Least 24 Hours.  

PubMed

The aim of this study was to compare the effects of static versus dynamic stretching on explosive performances and repeated sprint ability (RSA) following a 24-h delay. Sixteen young male soccer players performed 15-min of static stretching (SS), dynamic stretching (DS), or a no stretch control condition (CC) 24-h before performing explosive performances and RSA tests. This was a within-subject repeated measures study with SS, DS, and CC being counterbalanced. Stretching protocols included 2 sets of 7-min 30-sec (2 repetitions of 30-sec with 15-sec passive recovery) for five muscle-groups (quadriceps, hamstring, calves, adductors, and hip flexors). 24-h later (without any kind of stretching in warm up), players were tested for 30-m sprint test (with 10- and 20-m lap-times), 5 jump-test (5JT), and RSA test. Significant differences were observed between CC, SS and DS with 5JT (F=9.99, p<0.00, ES=0.40), 10m sprint time (F=46.52, p<0.00, ES=0.76), 20m sprint time (F=18.44, p<0.000, ES=0.55) and 30m sprint time (F=34.25, p<0.000, ES=0.70). The significantly better performance (p<0.05) was observed after DS as compared to CC and SS in 5JT, and sprint times for 10m, 20m and 30m. In contrast, significantly worse performance (p<0.05) was observed after SS as compared to CC in 5JT, and sprint times for 10m, 20m and 30m. With RSA, no significant difference was observed between different stretching protocols in total time (F=1.55, p>0.05), average time (F=1.53, p>0.05), and fastest time (F=2.30, p>0.05), except for the decline index (F=3.54, p<0.04, ES=0.19). Therefore, SS of the lower limbs and hip muscles had a negative effect on explosive performances up to 24-h post-stretching with no major effects on RSA. Conversely, DS of the same muscle groups are highly recommended 24-h before performing sprint and long-jump performances. In conclusion, the positive effects of DS on explosive performances seem to persist for 24-h. PMID:23615481

Haddad, Monoem; Dridi, Amir; Moktar, Chtara; Chaouachi, Anis; Wong, Del P; Behm, David; Chamari, Karim

2013-04-23

469

A helium refrigerator with features for supercritical pressure cooling  

NASA Astrophysics Data System (ADS)

The cold end of the helium refrigerator with features for supercritical pressure cooling where it deviates from a conventional refrigerator is described. Two methods of transporting cooling from the load are considered. The first uses a cold circulating pump to circulate helium around the load. The second simply uses the J-T flow from the refrigerator to transport cooling. Measurements have been performed to verify refrigerator capacity. The refrigerator configuration is illustrated, and results of the capacity of the refrigerator and performance data for the ejector and the circulating pump are presented. Operating experience is discussed.

Wu, K. C.; Brown, D. P.; Schlafke, A. P.; Sondericker, J. H.

1983-08-01

470

Percolative transition on ferromagnetic insulator manganites: Uncorrelated to correlated polaron clusters  

Microsoft Academic Search

In this work, we report an atomic scale study on the ferromagnetic insulator\\u000amanganite LaMnO$_{3.12}$ using $\\\\gamma-\\\\gamma$ PAC spectroscopy. Data analysis\\u000areveals a nanoscopic transition from an undistorted to a Jahn-Teller-distorted\\u000alocal environment upon cooling. The percolation thresholds of the two local\\u000aenvironments enclose a macroscopic structural transition\\u000a(Rhombohedric-Orthorhombic). Two distinct regimes of JT-distortions were found:\\u000aa high temperature regime

A. M. L. Lopes; J. P. Araujo; J. J. Ramasco; E. Rita; V. S. Amaral; J. G. Correia; R. Suryanarayanan; CERN EP

2006-01-01

471

Enhanced Ferromagnetic Insulating State In La0.85Ca0.15Mn1-xCrxO3 (0<=x<=0.1)  

Microsoft Academic Search

In order to investigate the ferromagnetic insulating state of La0.85Ca0.15MnO3 (LCM) system, Cr has been doped on its Mn site. The x-ray diffraction data indicate that there is no structural change due to Cr doping up to x = 0.1. In La0.85Ca0.15Mn1-xCrxO3 (LCMC, 0<=x<=0.1), the Jahn-Teller (JT) distortion is weakened and double exchange (DE) mechanism is stalled. As a result,

S. Mollah; G. Anjum; Z. Zainab; Alamgir

2011-01-01

472

Semiclassical formulation of non-Markovian quantum Brownian motion  

NASA Astrophysics Data System (ADS)

Recently it was shown [W. Koch, F. Grossmann, J.T. Stockburger, J. Ankerhold, Phys. Rev. Lett. 100 (2008) 230402] that a combination of an exact stochastic decomposition of non-Markovian dissipative quantum dynamics with the time-dependent semiclassical initial value formalism offers a powerful tool to describe quantum Brownian motion in domains of parameter space where other approaches fail. In particular, low temperatures, stronger friction, a wide range of spectral bath densities, and continuous nonlinear systems can be treated. Details of this formulation including its numerical implementation and the impact of non-Markovian phenomena are discussed for the exactly solvable case of a harmonic oscillator.

Koch, Werner; Großmann, Frank; Ankerhold, Joachim; Stockburger, Jürgen T.

2010-01-01

473

Flow of Classical Fluids in Small Structures  

NASA Astrophysics Data System (ADS)

J.-T. CHENG, N. GIORDANO, Purdue University We have studied classical fluid flow in lithographically produced micron and sub-micron scale channels. The pressure driven flow of several fluids has been studied and compared with theoretical predictions. The data for water agrees well with calculations which assume no-slip boundary conditions at the walls. However, for hexadecane we find that slip at the walls becomes important when the channel height is reduced below about 100 nm. These results will be compared with previous experiments and with theoretical expectations. Work supported by NSF grant DMR-9970708.

Cheng, Jiangtao; Giordano, Nick

2001-03-01

474

Study on Zn diffusion in Ge  

Microsoft Academic Search

In this report the diffusion of Zn into Ge is investigated. The experiments are accomplished in an evacuated and sealed quartz\\u000a ampoule using Zn as the diffusion source. The relation of theX\\u000a j-t and\\u000a $$C_5 - \\\\frac{l}{T}$$\\u000a is given. The influence of the source temperature on the surface micrograph is investigated. It is found that using the two-temperature\\u000a process a

Zhang Guicheng

1988-01-01

475

Study of the local distortions of the perovskite system La{sub 1-x}Sr{sub x}CoO{sub 3} (0 {ge} x {ge} 0.35) using the extended x-ray adsorption fine structure technique.  

SciTech Connect

We present a temperature-dependent extended x-ray absorption fine structure (EXAFS)/x-ray absorption near edge structure (XANES) investigation of La{sub 1-x}Sr{sub x}CoO{sub 3} (LSCO) over a wide doping concentration range (0 {le} x {le} 0.35). Five of the samples are nanoparticles (x = 0.15, 0.20, 0.25, 0.30, and 0.35) and four are bulk powders (x = 0, 0.15, 0.20, and 0.30). From the EXAFS analysis, we find that the Co-O bonds are well ordered for both bulk and nanoparticle materials and there is no clear evidence for a Jahn-Teller (JT) distortion in the LSCO system (either static or dynamic). The distortion of the Co-O bond with increasing T, parameterized by the width of the pair distribution function (PDF), {sigma} (T), can easily be modeled using a correlated Debye model with a high correlated Debye temperature {approx} 800 K. There is also no evidence for a step in plots of {sigma}{sup 2} vs T. In addition, the very small nonthermal contribution to {sigma}{sup 2} for the Co-O (PDF), {sigma}{sup 2} static, sets an upper limit on the extent of any Jahn-Teller distortion at low T. These experiments are inconsistent with the existence of a significant fraction of Co sites with an intermediate spin (IS) state, for which there is a JT active e{sub g} electron on the Co atoms. We cannot, however, exclude the possibility of a tiny fraction of sites having a JT distortion or some other (non-JT active) means of producing an IS state. The bulk samples are well ordered out to at least the third neighbors (Co-Co) while the nanoparticles show increased disorder and a reduction in coordination for Co-Co. XANES data are also presented, and, for both bulk and nanoparticle samples, there is essentially no edge shift with increasing Sr concentration. Bond-valence sums also indicate no change in effective Co valence. These results indicate that when holes are introduced via Sr doping, they have little Co(3d) character and the Co configuration remains close to 3d{sup 6}; we argue that the holes have mostly O(2p) character and are localized more on the O sites.

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

2009-01-01

476

On the use of stretched-exponential functions for both linear viscoelastic creep and stress relaxation  

Microsoft Academic Search

The use of the stretched-exponential function to represent both the relaxation function g(t)=(G(t)-G8)\\/(G0-G8) and the retardation function r(t) = (J8+t\\/?-J(t))\\/(J8-J0) of linear viscoelasticity for a given material is investigated. That is, if g(t) is given by exp (-(t\\/t)ß), can r(t) be represented as exp (-(t\\/?)µ) for a linear viscoelastic fluid or solid? Here J(t) is the creep compliance, G(t) is

Guy C. Berry; Donald J. Plazek

1997-01-01

477

Effect of shear in toroidal rotation on toroidicity induced Alfven eigenmodes  

NASA Astrophysics Data System (ADS)

It is found that low-n toroidicity induced Alfven eigenmodes (TAEs) excited by ion cyclotron resonance heating can be stabilized by counter-tangential neutral beam injection in JT-60U. The deformation of the radial structure of the TAE mode due to the shear in toroidal rotation is a plausible stabilizing mechanism. This mechanism is also expected to be effective in suppressing high-n TAE modes. Real time control of TAE mode amplitudes using toroidal rotation control is possible for burn control in fusion reactors

Saigusa, M.; Kusama, Y.; Ozeki, T.; Kimura, H.; Fujita, T.; Moriyama, S.; Fujii, T.; Azumi, M.; Afanassiev, V. I.; Neyatani, Y.; Fu, G. Y.; Cheng, C. Z.

1997-11-01

478

On the free boson gas in a weak external potential  

NASA Astrophysics Data System (ADS)

The equation of state for a free bose gas in a weak external field is derived using the W.K.B. approximation. The W.K.B. approximation becomes exact in the thermodynamic limit. I would like to thank J.T. Lewis for manu invaluable discussions and the Dublin Institute Advanced Studies for their hospitality. This pape is part of the research program of the ``Foundation for Fundamental Research on Matter'', which is financially supported by the ``Netherlands Organization for Pure Research''.

van den Berg, M.

1980-07-01

479

Stabilization of Sawtooth Oscillations by the Circulating Energetic Ions  

SciTech Connect

The influence of the well-circulating energetic ions on the ideal kink instability and semi-collisional tearing mode are studied. It is found that the precession of these ions can be a key factor that affects the instability: it can lead to the stabilization of the mentioned instabilities, the effect being weakly dependent on the direction of the injection. The developed theory is consistent with the experimental observations of the stabilization of sawtooth oscillations during the negative-ion-based neutral beam injection in JT-60U.

Ya.I. Kolesnichenko; V.S. Marchenko; R.B.White

2004-05-26

480

Towards high-precision measurement of the Tritium - He-3 mass difference  

NASA Astrophysics Data System (ADS)

An independent measurement of the mass difference of ^3He-^3T provides an important check of systematic errors in tritium beta-decay experiments that set limits to the electron anti-neutrino mass [1]. Using the precision Penning trap system developed at MIT but recently relocated to Florida State University [2], and the simultaneous two-ion cyclotron frequency measurement technique recently developed at MIT [3], we aim to measure this mass difference to better than 30 meV/c^2, more than an order of magnitude improvement over previous measurements [4,5]. Problems being addressed include producing single T^+ ions in the trap without spoiling the vacuum with ^3He, and the extension of the MIT techniques to ions of lighter mass. [1] KATRIN: http://iklau1.fzk.de/tritium [2] See abstract by Redshaw et al. [3] S. Rainville, J.K. Thompson, and D.E. Pritchard, Science 303, 334 (2004). [4] R.S. Van Dyck, D.L. Farnham, and P.B. Schwinberg, PRL 70, 2888 (1993). [5] G. Audi, A.H. Wapstra, and C. Thibault, Nuclear Physics A729, 337 (2003).

Shi, Wei; Redshaw, Matthew; Victoria, Juliette; Myers, Edmund

2004-05-01

481

Development and Characterization of Microcalorimeters for a Next Generation 187Re Beta-Decay Experiment  

NASA Astrophysics Data System (ADS)

It has been demonstrated in the past that observing the ?-decay spectrum of 187Re with microbolometers provides a suitable method to determine the mass of the electron anti-neutrino from ?-endpoint measurements. In a first step, with the experiment MIBETA a sensitivity of m ?e?15 eV/c2 was achieved. To compete with the sensitivity of m ?e?2.2 eV/c2 established by the Mainz/Troitsk tritium ?-decay experiment and the limit of m ?e?0.2 eV/c2 aimed at with KATRIN, a new experiment MARE has been initiated. As a first stage (MARE-1), 300 detectors consisting of silicon implanted thermistors, produced by NASA/GSFC, and absorbers of AgReO4 crystals will be mounted. To optimize the experimental setup, a test array was equipped with 10 AgReO4 crystals of various size and shape. The influence of the crystal quality as well as of different types of resin on rise time and energy resolution was investigated.

Kraft-Bermuth, S.; Arnaboldi, C.; Ferri, E.; Kilbourne, C.; Margesin, B.; McCammon, D.; Monfardini, A.; Nucciotti, A.; Pessina, G.; Previtali, E.; Schaeffer, D.; Sisti, M.

2008-05-01

482

Determining the Feasibility and Precision of an On-Site Radioactivity Test Chamber  

NASA Astrophysics Data System (ADS)

Backgrounds are a limiting factor to the sensitivity of many high precision nuclear physics experiments. Lowering these backgrounds is essential to experiments like Majorana and KATRIN, which look at neutrinoless double beta-decay and tritium beta-decay respectively. These backgrounds could be significantly reduced by using materials with low radioactivity. In order to aid these experiments in lowering backgrounds, we performed simulations to assess the feasibility and sensitivity with which an in-house radioactivity test chamber could be operated. Simulations were done in parallel with initial tests of the system. The system consists of two Ortec high purity germanium detectors housed in a lead chamber, which is shielded by scintillators used to determine cosmic coincidence. The programming utilized the Geant4 monte carlo toolkit, and analysis was done using ROOT. Simulations of calibration sources were compared with data in terms of spectral shape and overall normalization. The efficiency of the system was explored as a function of energy, detector orientation, and sample geometry. Simulations of the lead shielding and cosmic veto coverage were also done.

Reddy, A. S.; Detwiler, J. A.; Doe, P. J.; Johnson, R. A.; Ketchum, Wesley; Marino, M. G.; Schubert, A. G.; Vandevender, B. A.; Wilkerson, J. F.

2006-10-01

483

High-accuracy mass spectrometry for fundamental studies.  

PubMed

Mass spectrometry for fundamental studies in metrology and atomic, nuclear and particle physics requires extreme sensitivity and efficiency as well as ultimate resolving power and accuracy. An overview will be given on the global status of high-accuracy mass spectrometry for fundamental physics and metrology. Three quite different examples of modern mass spectrometric experiments in physics are presented: (i) the retardation spectrometer KATRIN at the Forschungszentrum Karlsruhe, employing electrostatic filtering in combination with magnetic-adiabatic collimation-the biggest mass spectrometer for determining the smallest mass, i.e. the mass of the electron anti-neutrino, (ii) the Experimental Cooler-Storage Ring at GSI-a mass spectrometer of medium size, relative to other accelerators, for determining medium-heavy masses and (iii) the Penning trap facility, SHIPTRAP, at GSI-the smallest mass spectrometer for determining the heaviest masses, those of super-heavy elements. Finally, a short view into the future will address the GSI project HITRAP at GSI for fundamental studies with highly-charged ions. PMID:20530821

Kluge, H-Jürgen

2010-01-01

484

Active neutral particle diagnostics for high temperature plasma  

NASA Astrophysics Data System (ADS)

This paper describes experimental studies related to active neutral particle diagnostics in the JT-60 tokamak. Detection efficiencies of a micro-channel plate (MCP), which has been widely used in plasma diagnostics, were determined for ions and neutrals. Multi-step processes for a neutral beam are predicted to enhance the beam stopping cross section in a plasma. In order to confirm the predictions, shine-through for a hydrogen and for a helium beam was measured in the JT-60 ohmic plasmas. The measurements for a hydrogen beam resulted in the cross sectional enhancement in the beam stopping. The same experiment using a helium beam indicated that the cross sectional enhancement for helium was much smaller than that for hydrogen at almost the same plasma parameters. Ion temperature diagnostics using active beam scattering were developed in a data processing technique, in consideration of the device function of a neutral particle analyzer and in estimation of the effect of beam ion component. Fundamental experiments for detecting helium ions in a plasma were performed using the two-electron transfer reaction between a helium atomic beam and helium ions, and the energy distribution and the density of the helium ions were determined. These experiments demonstrated the promise of the two-electron transfer reaction as an alpha ash detection in a burning plasma. A parasitic neutral efflux accompanied by active beam injection was investigated.

Tobita, Kenji

1993-01-01

485

Development of mechanical cryocoolers for Astro-H/SXS  

NASA Astrophysics Data System (ADS)

The Soft X-ray Spectrometer (SXS) is a high-resolution spectrometer with an X-ray micro-calorimeter array onboard the Japanese X-ray astronomy satellite Astro-H, planned for launch in 2013. The micro-calorimeter is operated at cryogenic temperature of 50 mK provided by the Adiabatic Demagnetization Refrigerator (ADR) with a heat sink of 1.3 K liquid helium stored in the SXS Dewar. To extend the liquid helium lifetime to over 3 years in orbit, two types of mechanical cryocoolers are installed: 20 K-class double-staged Stirling (2ST) coolers and a 1 K-class Joule-Thomson (JT) cooler. Improvement of mechanical cryocoolers has been investigated and verified for higher reliability and cooling performance. The engineering model (EM) of upgraded mechanical cryocoolers was fabricated for a long lifetime test. The required cooling power of 200 mW at 20 K for the 2ST cooler and 10 mW at 1.7 K for the JT cooler are achieved by EM test.

Sato, Yoichi; Sugita, Hiroyuki; Mitsuda, Kazuhisa; Nakagawa, Takao; Fujimoto, Ryuichi; Murakami, Masahide; Otsuka, Kiyomi; Tsunematsu, Shoji; Kanao, Kenichi; Narasaki, Katsuhiro

2010-09-01

486

Effect of fast-ion loss on momentum transport in tokamak plasmas with toroidal field ripples  

NASA Astrophysics Data System (ADS)

One-dimensional transport code, TASK/TX, has been developed to study the plasma rotation and the radial electric field in tokamak plasmas [1]. The code simultaneously solves a set of the two-fluid equations in the quasi-toroidal coordinates coupled with Maxwell's equations and beam-ion slowing down equation. It is observed in JT-60U that the reduction of the toroidal field ripple by installing ferritic steel tiles tends to rotate the plasma in the co direction because the counter rotation caused by the fast-ion loss is suppressed [2]. A model of the ripple loss has been made to study the phenomena and the behavior of the beam ions affected by the ripples can be self-consistently calculated. Numerical solutions reproduce the reduction of the toroidal co-rotation with co and perpendicular NBIs as the ripple amplitude increases. The toroidal rotation varies with the ripple amplitude at constant pressure gradient, as is observed in JT-60U [2], and the radial electric field also changes near the peripheral. This implies the change of the toroidal rotation strongly relates to that of the radial electric field through the radial force balance. [1] M. Honda and A. Fukuyama, submitted to J. Comput. Phys. [2] M. Yoshida, et al., Plasma Phys. Control. Fusion 48 1673 (2006).

Honda, Mitsuru; Takizuka, Tomonori; Fukuyama, Atsushi; Yoshida, Maiko; Ozeki, Takahisa

2007-11-01

487

The effects of intravenous ciprofloxacin on the electrocardiogram of healthy dogs.  

PubMed

The purpose of this study was to evaluate the electrocardiographic effects of single intravenous dose of ciprofloxacin in dogs. Ten adult cross-breed dogs of both sexes were selected as the sample population. Baseline electrocardiographic values were recorded just before drug administration. Then the dogs received intravenous infusion of ciprofloxacin (10 mg/kg) over the fifteen minutes. The ECGs recorded at 15, 30, 60 and 120 minutes after ciprofloxacin administration. The ECG measurements of heart rate, PR interval, QRS interval, ST segment, T-wave amplitude and QT interval were taken from lead II. There was a small but significant increase in the longest QT intervals over baseline at T?? (P = 0.041). The mean PR intervals, QTc intervals, JT intervals, ST segment, T-wave amplitude did not differ significantly before and after ciprofloxacin except for JT intervals at T?? (P = 0.041). At this measurement point, there was an increased QT interval value of 0.02 second or 9.51% in comparison to the baseline. In Conclusions, Only minor QT intervals changes were observed after ciprofloxacin injection. Despite the occurrence of ECG changes following intravenous ciprofloxacin administration neither dangerous rhythm disturbances nor serious ECG changes were seen in this study. PMID:19728129

Ghaffari, Masoud Selk; Parsamehr, Reza

2009-09-02

488

New Kinematical Constraints on Cosmic Acceleration  

SciTech Connect

We present and employ a new kinematical approach to ''dark energy'' studies. We construct models in terms of the dimensionless second and third derivatives of the scale factor a(t) with respect to cosmic time t, namely the present-day value of the deceleration parameter q{sub 0} and the cosmic jerk parameter, j(t). An elegant feature of this parameterization is that all {Lambda}CDM models have j(t)=1 (constant), which facilitates simple tests for departures from the {Lambda}CDM paradigm. Applying our model to redshift-independent distance measurements, from type Ia supernovae and X-ray cluster gas mass fraction measurements, we obtain clear statistical evidence for a late time transition from a decelerating to an accelerating phase. For a flat model with constant jerk, j(t)=j, we measure q{sub 0}=-0.81 {+-} 0.14 and j=2.16 +0.81 -0.75, results that are consistent with {Lambda}CDM at about the 1{sigma} confidence level. In comparison to dynamical analyses, the kinematical approach uses a different model set and employs a minimum of prior information, being independent of any particular gravity theory. The results obtained with this new approach therefore provide important additional information and we argue that both kinematical and dynamical techniques should be employed in future dark energy studies, where possible.

Rapetti, David; Allen, Steve W.; Amin, Mustafa A.; Blandford, Roger; /-KIPAC, Menlo Park

2007-05-25

489

The electronic structure of organic-inorganic hybrid compounds: (NH4)2CuCl4, (CH3NH3)2CuCl4 and (C2H5NH3)2CuCl4  

NASA Astrophysics Data System (ADS)

Hybrid organic-inorganic compounds are an intriguing class of materials that have been experimentally studied over the past few years because of a potential broad range of applications. The electronic and magnetic properties of three organic-inorganic hybrid compounds with compositions (NH4)2CuCl4, (CH3NH3)2CuCl4 and (C2H5NH3)2CuCl4 are investigated for the first time with density functional theory plus on-site Coulomb interaction. A strong Coulomb interaction on the copper causes a relatively weak exchange coupling within the layers of the octahedral network, in good agreement with experiment. The character of the exchange interaction (responsible for magnetic behavior) is analyzed. The calculations reveal that (C2H5NH3)2CuCl4 has the strongest Jahn-Teller (JT) distortion in comparison with the two other compounds. The easy axis of magnetization is investigated, showing a weak anisotropic interaction between inter-layer Cu2+ ions in the (C2H5NH3)2CuCl4 structure. Orbital ordering is concluded from our partial density of states calculations: a cooperation of the JT distortion with an antiferro-distortive pattern.

Zolfaghari, P.; de Wijs, G. A.; de Groot, R. A.

2013-07-01

490

Resistive Generation of Intergalactic Magnetic Field at Cosmic Dawn  

NASA Astrophysics Data System (ADS)

Miniati & Bell (2011) proposed a mechanism for the generation of magnetic seeds that is based the finite resistivity of the low temperature IGM in the high redshift universe. In this model, cosmic-ray protons generated by the first generation of galaxies, escape into the intergalactic medium carrying an electric current that induces return currents, jt, and associated electric fields, E = ?jt there. Because the resistivity, ?, depends on the IGM temperature, which is highly inhomogeneous due to adiabatic contraction and shocks produced by structure formation, a non-vanishing curl of the electric field exists which sustains the growth of magnetic field. In this contribution we have developed an approximate numerical model for this process by implementing the source terms of the resistive mechanism in the cosmological code CHARM. Our numerical estimates substantiate the earlier analysis in Miniati & Bell (2011) which found magnetic seeds between 10-18 and 10-16 Gauss throughout cosmic space at redshift z ˜ 6, consistent with conservative estimates of magnetic fields in voids at z ˜ 0 from recent gamma-ray experiments.

Miniati, F.; Bell, A. R.

2012-07-01

491

Gauge-boson production with multiple jets near threshold  

NASA Astrophysics Data System (ADS)

Signatures of new physics beyond the Standard Model are often characterized by large missing transverse energy (E?T) produced in association with multiple jets. The dominant Standard Model background to such processes comes from gauge-boson production in association with jets. A standard search strategy involves looking for an excess in the meff distribution, where meff=E?T+?JpJT and pJT denotes the transverse momentum of the Jth jet. The region of large meff is dominated by jet production near threshold, giving rise to large Sudakov logarithms that can change the magnitude and shape of the meff distribution. We present an effective theory framework for the resummation of such threshold logarithms. We perform an analysis for exclusive jet production using the N-jettiness global event shape, which allows theoretical control to also be maintained over large logarithms induced by vetoing additional jets. As a first step, we give explicit numerical results with next-to-leading-log resummation for pp??+2 jets in the large meff region.

Liu, Xiaohui; Mantry, Sonny; Petriello, Frank

2012-10-01

492

Photophysics of fluorinated benzene. III. Hexafluorobenzene  

NASA Astrophysics Data System (ADS)

A theoretical study of the photoabsorption spectroscopy of hexafluorobenzene (HFBz) is presented in this paper. The chemical effect due to fluorine atom substitution on the electronic structure of benzene (Bz) saturates in HFBz. State- of-the-art quantum chemistry calculations are carried out to establish potential energy surfaces and coupling surfaces of five energetically low-lying electronic (two of them are orbitally degenerate) states of HFBz. Coupling of these electronic states caused by the Jahn-Teller (JT) and pseudo-Jahn-Teller (PJT) type of interactions are examined. The impact of these couplings on the nuclear dynamics of the participating electronic states is thoroughly investigated by quantum mechanical methods and the results are compared with those observed in the experiments. The complex structure of the S1 <-- S0 absorption band is found to originate from a very strong nonadiabatic coupling of the S2 (of ??* origin) and S1 (of ??* origin) state. While S2 state is orbitally degenerate and JT active, the S1 state is nondegenerate. These states form energetically low-lying conical intersections (CIs) in HFBz. These CIs are found to be the mechanistic bottleneck of the observed low quantum yield of fluorescence emission, non overlapping absorption, and emission bands of HFBz and contribute to the spectral width. Justification is also provided for the observed two peaks in the second absorption (the unassigned ``c band'') band of HFBz. The peaks observed in the third, fourth, and fifth absorption bands are also identified and assigned.

Mondal, T.; Reddy, S. Rajagopala; Mahapatra, S.

2012-08-01

493

Novel nonsense CDC73 mutations in Chinese patients with parathyroid tumors.  

PubMed

Hyperparathyroidism-jaw tumor syndrome (HPT-JT) is an autosomal dominant disease characterized by the occurrences of parathyroid tumors and ossifying fibroma of maxilla/mandible. It is caused by mutations in CDC73 gene and mutation carriers are at increased risk of parathyroid carcinoma. Hyperparathyroidism could be the sole manifestation. We reported two Chinese patients having parathyroid neoplasm with equivocal malignant potential and parathyroid carcinoma respectively with both germline and somatic CDC73 mutations detected. Both of them presented with severe hypercalcemia and primary hyperparathyroidism with no other HPT-JT associated tumors and negative family history. We identified one novel germline mutation CDC73 NM_024529.4: c.1475G > A; NP_078805.3: p.Trp492X and one novel somatic mutation CDC73 NM_024529.4: c.142G > T; NP_078805.3: p.Glu48X. The other germline mutation CDC73 NM_024529.4: c.226C > T; NP_078805.3: p.Arg76X and somatic mutation CDC73 NM_024529.4: c.85delG; NP_078805.3: p.Glu29SerfsX8 were previously reported. This is the first report of CDC73 mutations in the Chinese population. Genetic analysis is reliable to confirm the underlying hereditary basis of hyperparathyroidism. By identification of mutations, the patient and the family members could benefit from regular surveillance for early detection of tumors. PMID:21732217

Siu, Wai Kwan; Law, Chun Yiu; Lam, Ching Wan; Mak, Chloe Miu; Wong, Gary Wing Kin; Ho, Andrew Yiu Yan; Ho, Kwok Yip; Loo, Ka Tai; Chiu, Sin Chuen; Chow, Louis Tsun Cheung; Tong, Sui Fan; Chan, Albert Yan Wo

2011-12-01

494

Dynamic Simulation of a Helium Liquefier  

SciTech Connect

Dynamic behavior of a helium liquefier has been studied in detail with a Cryogenic Process REal-time SimulaTor (C-PREST) at the National Institute for Fusion Science (NIFS). The C-PREST is being developed to integrate large-scale helium cryogenic plant design, operation and maintenance for optimum process establishment. As a first step of simulations of cooldown to 4.5 K with the helium liquefier model is conducted, which provides a plant-process validation platform. The helium liquefier consists of seven heat exchangers, a liquid-nitrogen (LN2) precooler, two expansion turbines and a liquid-helium (LHe) reservoir. Process simulations are fulfilled with sequence programs, which were implemented with C-PREST based on an existing liquefier operation. The interactions of a JT valve, a JT-bypass valve and a reservoir-return valve have been dynamically simulated. The paper discusses various aspects of refrigeration process simulation, including its difficulties such as a balance between complexity of the adopted models and CPU time.

Maekawa, R.; Ooba, K.; Mito, T. [National Institute for Fusion Science, Toki, Gifu, 509-5292 (Japan); Nobutoki, M. [Nippon Sanso Co., Kawasaki, Kanagawa, 210-0861 (Japan)

2004-06-23

495

Forced flow supercritical helium in a closed heat transfer loop subjected to pulsed heat loads  

NASA Astrophysics Data System (ADS)

The superconducting magnets of the tokamak JT-60SA are cooled by means of forced flows of supercritical helium at 4.4 K and 0.5 MPa. The closed loops transfer heat from the magnets to the refrigerator through heat exchangers immersed into a saturated liquid helium bath. An experimental loop was designed to represent a 1/20 scaled down mock-up of JT-60SA central solenoid cooling circuits. This design for keeping the same transit times in the helium circuits, aims at observing the thermally induced transients in the closed loop. Indeed, heated section simulates the variable loads coming from the magnet circuits. A series of experiments was performed with pulsed loads in an isochoric configuration of the loop. The cold circulator has been characterized under pulsed operation and its performances are addressed. Mass flow regulations at the interface of the refrigerator were tested to smooth the pulsed loads with the saturated liquid bath acting as a thermal buffer. Knowledge of the pulsed loads effects on the cryogenic components is important in view of a safe operation of the cryogenic system.

Hoa, Christine; Bonnay, Patrick; Bon-Mardion, Michel; Charvin, Philippe; Cheynel, Jean-Noel; Girard, Alain; Lagier, Benjamin; Michel, Frederic; Monteiro, Lionel; Poncet, Jean-Marc; Roussel, Pascal; Rousset, Bernard; Vallcorba-Carbonell, Roser

2012-06-01

496

Vacuum system for superconducting LINAC at TIFR  

NASA Astrophysics Data System (ADS)

The superconducting heavy ion LINAC booster at the TIFR-BARC facility has been operational. Seven super conducting cryostats containing 4 quarter wave resonators each along with beam lines, bending magnets, switching magnet, diagnostics and vacuum system have been commissioned. The heart of the cryogenic system for the heavy ion superconducting LINAC booster is a custom-built liquid helium refrigerator made by Linde Kryotechnik, Switzerland. The Refrigerator is rated for 300 Watts at 4.5 K with a dual JT (Joule-Thomson valve) at the final cooling stage, which allows simultaneous connections to the cryogenic loads (the LINAC module cryostats) and to a liquid helium storage dewar (1000 litres). The two-phase helium at 4.5 K produced at the JT stage in the refrigerator is delivered to the cryostats through a cryogenic distribution system. The cryogenic distribution system for the LINAC is designed to deliver both liquid helium and liquid nitrogen to the cryostats. The details of UHV system, indigenously developed beam line components, pumps and module cryostats will be presented.

Pillay, R. G.

2008-05-01

497

Experimental evaluation of an adaptive Joule-Thomson cooling system including silicon-microfabricated heat exchanger and microvalve components  

PubMed Central

This article reports the evaluation of a Joule–Thomson (JT) cooling system that combines two custom micromachined components—a Si/glass-stack recuperative heat exchanger and a piezoelectrically actuated expansion microvalve. With the microvalve controlling the flow rate, this system can modulate cooling to accommodate varying refrigeration loads. The perforated plate Si/glass heat exchanger is fabricated with a stack of alternating silicon plates and Pyrex glass spacers. The microvalve utilizes a lead zirconate titanate actuator to push a Si micromachined valve seat against a glass plate, thus modulating the flow passing through the gap between the valve seat and the glass plate. The fabricated heat exchanger has a footprint of 1 × 1 cm2 and a length of 35 mm. The size of the micromachined piezoelectrically actuated valve is about 1 × 1 × 1 cm3. In JT cooling tests, the temperature of the system was successfully controlled by adjusting the input voltage of the microvalve. When the valve was fully opened (at an input voltage of ?30 V), the system cooled down to a temperature as low as 254.5 K at 430 kPa pressure difference between inlet and outlet at steady state and 234 K at 710 kPa in a transient state. The system provided cooling powers of 75 mW at 255 K and 150 mW at 258 K. Parasitic heat loads at 255 K are estimated at approximately 700 mW.

Zhu, Weibin; Park, Jong M.; White, Michael J.; Nellis, Gregory F.; Gianchandani, Yogesh B.

2011-01-01

498

Residual Fluctuations in Internal Transport Barrier  

NASA Astrophysics Data System (ADS)

Identification of density fluctuations ( ~ 0.5 percent) with short radial correlation length (k_r?i ~= 3) measured in ITB region of JT60-U Reversed Shear plasmas(R. Nazikian et al.,) IAEA-F1-CN-69/PDP/03 (1998). is a theoretical challenge. Short wavelength trapped electron modes are not intrinsically tied to miniscule scales of electron gyroradius, and therefore more robust(P.H. Diamond et al.,) 13th IAEA, Vol II, p. 9. (1991). than the ETG modes. Near q_min, the radial correlation length is determined by an asymptotic balance between the profile variations and trapped electron polarization effects, yielding ? r ~= ? ?_beL* and ? n/n0 ~ ? r/?L_pR, in rough agreements with the observations. These fluctuations can survive the macroscopic E × B shear in JT60-U RS plasmas locally since the shearing rate typically has a local minimum well below the linear growth rate calculated from FULL code in the middle of ITB region. Strong self-generation of zonal flows in the sharp gradient region(Z. Lin et al.,) Science 281, 1835 (1998). may also play a crucial role, and measurable statistical signature of turbulence frequency spectrum modulation by zonal flows will be discussed.

Hahm, T. S.; Nazikian, R.; Lin, Z.; Rewoldt, G.

1999-11-01

499

Electronic currents and the formation of nanopores in porous anodic alumina.  

PubMed

The formation processes of barrier anodic alumina (BAA) and porous anodic alumina (PAA) are discussed in detail. The anodizing current J(T) within the oxide includes ionic current j(ion) and electronic current j(e) during the anodizing process. The j(ion) is used to form an oxide and the j(e) is used to give rise to oxygen gas or sparking. The j(e) results from the impurity centers within the oxide. For a given electrolyte, the j(e) is dependent on the impurity centers and independent of the J(T). The formation of nanopores can be ascribed to the oxygen evolution within the oxide. Oxygen gas will begin to be released at the critical thickness d(c). The manner of the development of PAA is in accordance with that of BAA. The differences between PAA and BAA are the magnitude of j(e) or the continuity of oxygen evolution. There are two competitive reactions, i.e. oxide growth (2Al3 + 3O2- --> Al2O3) and oxygen evolution (2O2- --> O2 up arrow + 4e). The former keeps the wall of the channel lengthened, the latter keeps the channel open. By controlling the release rate of oxygen gas under different pressures, the shape of the channels can be adjusted. The present results may open up some opportunities for fabricating special templates. PMID:19875874

Zhu, Xu-Fei; Song, Ye; Liu, Lin; Wang, Chen-Yu; Zheng, Jie; Jia, Hong-Bing; Wang, Xin-Long

2009-10-29

500

Electronic currents and the formation of nanopores in porous anodic alumina  

NASA Astrophysics Data System (ADS)

The formation processes of barrier anodic alumina (BAA) and porous anodic alumina (PAA) are discussed in detail. The anodizing current JT within the oxide includes ionic current jion and electronic current je during the anodizing process. The jion is used to form an oxide and the je is used to give rise to oxygen gas or sparking. The je results from the impurity centers within the oxide. For a given electrolyte, the je is dependent on the impurity centers and independent of the JT. The formation of nanopores can be ascribed to the oxygen evolution within the oxide. Oxygen gas will begin to be released at the critical thickness dc. The manner of the development of PAA is in accordance with that of BAA. The differences between PAA and BAA are the magnitude of je or the continuity of oxygen evolution. There are two competitive reactions, i.e. oxide growth (\\mathrm {2Al^{3+}+3O^{2-}} \\to \\mathrm {Al_{2}O_{3}} ) and oxygen evolution (\\mathrm {2O^{2-}} \\to \\mathrm {O_{2}} {\\uparrow } +4\\rme ). The former keeps the wall of the channel lengthened, the latter keeps the channel open. By controlling the release rate of oxygen gas under different pressures, the shape of the channels can be adjusted. The present results may open up some opportunities for fabricating special templates.

Zhu, Xu-Fei; Song, Ye; Liu, Lin; Wang, Chen-Yu; Zheng, Jie; Jia, Hong-Bing; Wang, Xin-Long

2009-11-01