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1

JT-60 experiments  

NASA Astrophysics Data System (ADS)

In the last year, ohmic heating experiments were performed in JT-60 for about three months; May-June 1985 and March 1986. The major experimental effort has been concentrated on the divertor configuration in anticipation of H-mode operation of JT-60 in high power supplementary heating experiments starting in August 1986. Stable discharges with a divertor have been obtained at Ip = 1.85 MA and overlinene = 5.7 × 10 19m -3. Radiated power from the main plasma in divertor discharges is reduced to one third of that in material limiter discharges. The electron density has a broad radial profile and the effective safety reaches qeff = 2.5. The neutral gas pressure in the divertor chamber becomes significantly high and the control of particle recycling has been attempted.

Abe, T.; Aikawa, H.; Akaoka, N.; Akasaka, H.; Akiba, M.; akino, N.; Akiyama, T.; Ando, T.; Anno, K.; Aoyagi, T.; Arai, T.; Arakawa, K.; Araki, M.; Azumi, M.; Dairaku, M.; Ebisawa, N.; Fujii, T.; Fukuda, T.; Fukuda, T.; Furukawa, H.; Hamamatsu, K.; Haraguchi, T.; Hayashi, K.; Hiratsuka, H.; Hirayama, T.; lida, K.; Hiroki, S.; Hiruta, K.; Hitomi, N.; Honda, M.; Horiike, H.; Hosoda, R.; Hosogane, N.; Ichige, H.; Iida, S.; Iijima, T.; Ikeda, Y.; Imai, T.; Inami, H.; Aisaji, N.; Isaka, M.; Ishihara, M.; Itoh, H.; Itoh, Y.; Kanai, T.; Katoh, T.; Kawai, M.; Kawamata, Y.; Kihara, Y.; Kawasaki, K.; Kikuchi, M.; Kimura, H.; Kimura, T.; Kishimoto, H.; Kitahara, K.; Kitamura, S.; Kutsunezaki, A.; Kiyono, K.; Kodama, K.; Koide, Y.; Koike, T.; Komata, M.; Kondo, I.; Konoshima, S.; Kubo, H.; Kunieda, S.; Kurakada, S.; Kurihara, K.; Kuriyama, M.; Kuroda, T.; Maeno, M.; Matsuda, S.; Matsukawa, M.; Matsukawa, T.; Matsuo, M.; Matsuoka, M.; Miya, N.; Miyachi, K.; Miyo, Y.; Mizuhashi, K.; Mizuno, M.; Murakami, Y.; Mutoh, M.; Nagami, M.; Nagashima, A.; Nagashima, K.; Nagaya, S.; Nakamura, H.; Nakamura, Y.; Nagashima, T.; Nemoto, M.; Neyatani, Y.; Niikura, S.; Ninomiya, H.; Nishitani, T.; Nishiyama, T.; Nomata, H.; Noshiroya, S.; Ogiwara, N.; Ohasa, K.; Ohga, T.; Ohhara, H.; Ohkubo, M.; Ohmori, K.; ohmori, S.; Ohmori, Y.; ohsato, Y.; Ohshima, T.; Ohta, M.; Ohara, Y.; Ohuchi, Y.; Okumura, Y.; Otsu, K.; Oikawa, A.; Ozeki, T.; Saigusa, M.; Sakamoto, K.; Sakasai, A.; Sakata, S.; Sato, M.; Sawahata, M.; Shibanuma, K.; Shibata, T.; Seimiya, M.; Seki, M.; Seki, S.; Shitomi, M.; Shimada, R.; Shimizu, K.; Shimizu, M.; Shimomura, Y.; Shinozaki, S.; Shirai, H.; Shirakata, H.; Suganuma, K.; Sugawara, T.; Sugie, T.; Sunaoshi, H.; Suzuki, K.; Suzuki, M.; Suzuki, N.; Suzuki, S.; Suzuki, Y.; Tahira, S.; Takahashi, M.; Takahashi, S.; Takahashi, T.; Takatsu, H.; Takayasu, Y.; Takeda, S.; Takeuchi, H.; Takizua, T.; Tamura, S.; Tanaka, E.; Tanaka, S.; Tanaka, T.; Tani, K.; Terakado, T.; Tobita, K.; Tokutake, T.; Totsuka, T.; Toyoshima, N.; Tsugita, T.; Tsuji, S.; Tsukahara, Y.; Tsuneoka, M.; Uehara, K.; Uehara, M.; Ujiie, K.; Urakawa, H.; Uramoto, Y.; Ushigusa, K.; Usui, K.; Watanabe, K.; Yagyu, J.; Yamada, K.; Yamamoto, M.; Yamashita, O.; Yamashita, Y.; Yano, K.; Yokokura, K.; Yokomizo, H.; Yonekawa, I.; Yoshida, H.; Yoshikawa, M.; Yoshino, R.

1987-02-01

2

Katrin Kneipp Martin Moskovits Harald Kneipp (Eds.)  

E-print Network

Katrin Kneipp Martin Moskovits Harald Kneipp (Eds.) Surface-Enhanced Raman Scattering Physics into account the enhancement of the excitation rate due to the lo- cal field intensity increased by I(r) times transmission gain are the same.1 We will return to this formula and compare it to our results repeatedly

Stockman, Mark I.

3

The penning trap electron gun for the KATRIN experiment  

E-print Network

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

Trowbridge, Sarah Nicole

2008-01-01

4

A mobile magnetic sensor unit for the KATRIN main spectrometer  

NASA Astrophysics Data System (ADS)

The KArlsruhe TRItium Neutrino experiment (KATRIN) aims to measure the electron neutrino mass with an unprecedented sensitivity of 0.2 eV/c2, using ? decay electrons from tritium decay. For the control of magnetic field in the main spectrometer area of the KATRIN experiment a mobile magnetic sensor unit is constructed and tested at the KATRIN main spectrometer site. The unit moves on inner rails of the support structures of the low field shaping coils which are arranged along the the main spectrometer. The unit propagates on a caterpillar drive and contains an electro motor, battery pack, board electronics, 2 triaxial flux gate sensors and 2 inclination senors. During operation all relevant data are stored on board and transmitted to the master station after the docking station is reached.

Osipowicz, A.; Seller, W.; Letnev, J.; Marte, P.; Müller, A.; Spengler, A.; Unru, A.

2012-06-01

5

Characterization of the KATRIN Focal Plane Detector  

NASA Astrophysics Data System (ADS)

The Karlsruhe Tritium Neutrino (KATRIN) Experiment is a next generation tritium beta decay experiment designed to measure directly the electron neutrino mass with a sensitivity of 0.2 eV. In the experiment, electrons from tritium decay of a gaseous source are magnetically guided through analyzing solenoidal retarding electrostatic spectrometers and detected via a focal plane detector. The focal plane detector is a 90mm diameter, 500 micron thick monolithic silicon pin-diode array with 148 pixels. The diode contacts have a titanium nitride overlayer and are connected to preamplifiers via an array of spring-loaded pogo pins. This novel connection scheme minimizes backgrounds from radioactive materials near the detector, facilitates characterization and replacement of the detector wafer, but requires a unique mounting design. The force of the pins strains the silicon, possibly altering the detector properties and performance. Results on the mechanical, thermal and electrical performance of a prototype detector under stress from pogo pin readouts will be presented.

Bodine, Laura; Leber, Michelle; Myers, Allan; Tolich, Kazumi; Vandevender, Brent; Wall, Brandon

2008-10-01

6

Computational Forensics: Towards Hybrid-Intelligent Crime Investigation Katrin Franke  

E-print Network

Computational Forensics: Towards Hybrid-Intelligent Crime Investigation Katrin Franke Norwegian procedures for crime investigation, prosecution and the enforcement of law. Computer-based methods have also investigative procedures, ­ search large volumes of data efficiently, ­ visualize and document the results

7

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

8

Background simulations and detector design for the KATRIN experiment  

Microsoft Academic Search

The Karlsruhe Tritium Neutrino Experiment (KATRIN) aims to measure directly the mass of the neutrino, an open question in physics. The experiment will measure the integrated tritium beta-decay electron energy spectrum near the 18.6 keV endpoint, where the shape is most sensitive to neutrino mass. In order to reach the proposed sensitivity to neutrino mass of 0.2 eV (90% CL)

M. L. Leber; T. H. Burritt; J. A. Dunmore; P. J. Doe; J. A. Formaggio; R. G. H. Robertson; M. Steidl; B. A. VanDevender; B. L. Wall; J. F. Wilkerson

2007-01-01

9

Wall conditioning in JT-60  

NASA Astrophysics Data System (ADS)

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

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

1987-02-01

10

Development of the JT-60SA Neutral Beam Injectors  

NASA Astrophysics Data System (ADS)

This paper describes the development of the neutral beam (NB) systems on JT-60SA, where 30-34 MW D0 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- 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.; Kubo, N.; Kawai, M.; Grisham, L. R.

2011-09-01

11

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

E-print Network

The presence of light sterile neutrinos would strongly modify the energy spectrum of the Tritium \\beta-electrons. We perform an analysis of the KATRIN experiment's sensitivity by scanning almost all the allowed region of neutrino mass-squared difference and mixing angles of the 3+1 scenario. We consider the effect of the unknown absolute mass scale of active neutrinos on the sensitivity of KATRIN to the sterile neutrino mass. We show that after 3 years of data-taking, the KATRIN experiment can be sensitive to mixing angles as small as sin^2 (2\\theta_s) ~ 10^-2. Particularly we show that for small mixing angles, sin^2 (2\\theta_s) < 0.1, the KATRIN experiment can gives the strongest limit on active-sterile mass-squared difference.

Arman Esmaili; Orlando L. G. Peres

2012-06-28

12

High power heating results on JT-60  

Microsoft Academic Search

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

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

1988-01-01

13

Recent results in JT-60 experiments  

Microsoft Academic Search

Emphases in JT-60 experiments are placed on (1) lower-hybrid (LH) current drive characteristics with a multi-junction type launcher, and (2) the confinement study with combination of neutral beam injection LH current drive and pellet injection. The new multi-junction LH launcher provides a sharp N\\/sub \\/\\/\\/ spectrum with high directivity for N\\/sub \\/\\/\\/=1-3.4. The current drive efficiency and the radial distribution

M. Nagami; I. Aoki; N. Akaoka; H. Akasaka; M. Akiba; N. Akino; T. Ando; K. Annou; T. Aoyagi; T. Arai; K. Arakawa; M. Araki; M. Azumi; S. Chiba; M. Dairaku; N. Ebisawa; T. Fujii; T. Fukuda; A. Funahashi; H. Furukawa; H. Gunji; K. Hamamatsu; M. Hanada; M. Hara; K. Haraguchi; H. Hiratsuka; T. Hirayama; S. Hiroki; K. Hiruta; M. Honda; H. Horiike; R. Hosada; N. Hosogane; K. Iida; Y. Iida; T. Iijima; K. Ikeda; Y. Ikeda; T. Imai; T. Inoue; N. Isaji; M. Isaka; S. Ishida; K. Itami; N. Itige; T. Ito; T. Kakizaki; Y. Kamada; A. Kaminaga; T. Kaneko; T. Kato; M. Kawai; M. Kawabe; Y. Kawamata; Y. Kawano; K. Kawasaki; K. Kikuchi; M. Kikuchi; H. Kimura; T. Kimura; H. Kishimoto; S. Kitamura; K. Kiyono; N. Kobayashi; K. Kodama; Y. Kurihata; Y. Koide; T. Koike; M. Komata; I. Kondo; S. Konoshima; H. Kubo; S. Kunieda; K. Kurihara; M. Kuriyama; M. Kusaka; Y. Kusama; T. Kushima; Y. Mabuti; S. Maehara; K. Maeno; T. Matoba; S. Matsuda; M. Matsukawa; T. Matsukawa; M. Matsuoka; Y. Matsuzaki; Y. Miura; N. Miya; K. Miyachi; Y. Miyo; M. Mizuno; K. Mogaki; S. Moriyama; Y. Murakami; M. Muto; K. Nagase; A. Nagashima; K. Nagashima; T. Nagashima; S. Nagaya; O. Naito; H. Nakamura; H. Nemoto; M. Nemoto; Y. Neyatani; H. Ninomiya; N. Nishino; T. Nishitani; H. Nobusaka; H. Nomata; K. Obara; K. Odajima; Y. Ogawa; N. Ogiwara; T. Ohga; Y. Ohara; H. Oohara; T. Ohshima; K. Ohta; M. Ohta; S. Ohuchi; Y. Ohuchi; H. Okumura; Y. Okumura; K. Omori; S. Omori; Y. Omori; T. Ozeki; M. Saegusa; N. Saitoh; A. Sakasai; S. Sakata; T. Sasajima; K. Sato; M. Sato; M. Sawahata; T. Sebata; M. Seimiya; M. Seki; S. Seki; K. Shibanuma; M. Shimada; R. Shimada; K. Shimizu; M. Shimizu; Y. Shimomura; S. Shinozaki; H. Shirai; H. Shirakata; M. Shitomi; K. Suganuma; T. Sugawara; T. Sugie; H. Sunaoshi; M. Suzuki; N. Suzuki; S. Suzuki; H. Tachibana; M. Takahashi; S. Takahashi; T. Takahashi; M. Takasaki; H. Takatsu; H. Takeuchi; A. Takeshita; T. Takizuka; S. Tamura; S. Tanaka; T. Tanaka; Y. Tanaka; K. Tani; M. Terakado; T. Terakado; K. Tobita; T. Totsuka; N. Toyoshima; F. Tsuda; T. Tsugita; S. Tsuji; Y. Tsukahara; M. Tsuneoka; K. Uehara; Y. Uramoto; H. Usami; K. Ushigusa; K. Usui; J. Yagyu; M. Yamagiwa; M. Yamamoto; O. Yamashita; T. Yamazaki; K. Yokokura; K. Yokoyama; K. Yoshikawa; H. Yoshida; R. Yoshino; Y. Yoshioka; I. Yonekawa; T. Yoneda; K. Watanabe

1989-01-01

14

Present status of JT-60 upgrade  

Microsoft Academic Search

In the JT-60 tokamak, the original outer single-null plasma containment vacuum vessel and poloidal field coils, will be exchanged with those of large D-shaped cross sections. The basic dimensions of the new vessel will allow plasmas of 6-MA current, 70 to 100 m3 volume, and vertical elongations of 1.4 to 1.7. Installation of a large vessel is made possible at

H. Horiike; T. Ando; T. Horie; T. Kushima; M. Matsukawa; Y. Neyatani; H. Ninomiya; M. Shimizu; M. Yamamoto

1989-01-01

15

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

NASA Technical Reports Server (NTRS)

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

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

1979-01-01

16

Sterile neutrinos and right-handed currents in KATRIN  

E-print Network

Kurie-plot experiments allow for neutrino-mass measurements based on kinematics in an almost model-independent manner. A future tritium-based KATRIN-like experiment can be sensitive to light sterile neutrinos with masses below 18 keV, which are among the prime candidates for warm dark matter. Here we consider such keV neutrinos in left--right symmetric extensions, i.e. coupled to right-handed currents, which allow for an enhanced contribution to beta decay even for small active--sterile mixing, without violating astrophysical X-ray constraints. The modified spectral shape is in principle distinguishable from the standard contribution---especially for sterile neutrino masses below 9 keV, which can lead to a distinct peak. We compare the sensitivity to constraints from the LHC and neutrinoless double beta decay.

James Barry; Julian Heeck; Werner Rodejohann

2014-07-17

17

Sterile neutrinos and right-handed currents in KATRIN  

NASA Astrophysics Data System (ADS)

Kurie-plot experiments allow for neutrino-mass measurements based on kinematics in an almost model-independent manner. A future tritium-based KATRIN-like experiment can be sensitive to light sterile neutrinos with masses below 18 keV, which are among the prime candidates for warm dark matter. Here we consider such keV neutrinos in left-right symmetric extensions, i.e. coupled to right-handed currents, which allow for an enhanced contribution to beta decay even for small active-sterile mixing, without violating astrophysical X-ray constraints. The modified spectral shape is in principle distinguishable from the standard contribution — especially for sterile neutrino masses below 9 keV, which can lead to a distinct peak. We compare the sensitivity to constraints from the LHC and neutrinoless double beta decay.

Barry, James; Heeck, Julian; Rodejohann, Werner

2014-07-01

18

Commissioning of the Cryogenic Transfer Line for the Katrin Experiment  

NASA Astrophysics Data System (ADS)

The cryogenic transfer line for KATRIN connects 3 large superconducting magnet systems in the Tritium Laboratory Karlsruhe (TLK) with a He refrigerator installed in an external machine building. The vacuum-insulated transfer line comprises 1 N2 and 5 He process lines that are surrounded by a LN2-cooled radiation shield. Covering a distance of 40 m, the transfer line includes 4 valve boxes, 1 T-junction, 1 vertical and 3 horizontal line sections. After the introductory system description, an overview is given on project coordination and quality assurance, together with results of leak testing during pre-acceptance and commissioning. The method and results of thermal loss measurements in the He system are explained, reaching an accuracy of ±30% with standard process instrumentation. Potential improvements in the MLI insulation scheme are revealed, based on both the measurements and theoretical considerations. The experimental results are finally compared with data of large cryogenic transfer systems.

Grohmann, S.; Gil, W.; Neumann, H.; Weiss, C.

2010-04-01

19

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

20

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

E-print Network

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

Schneider, Katrin

21

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

NASA Technical Reports Server (NTRS)

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

1974-01-01

22

JT15D simulated flight data evaluation  

NASA Technical Reports Server (NTRS)

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

Holm, R. G.

1984-01-01

23

Advanced fusion technologies developed for JT-60 superconducting tokamak  

NASA Astrophysics Data System (ADS)

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

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

2004-02-01

24

A fast cool-down J-T minicryocooler  

NASA Astrophysics Data System (ADS)

Design criteria for miniature open cycle Joule-Thomson (J-T) refrigerators were discussed by Geist and Lashmet (1960). Advantages of J-T minicryocoolers are related to compactness, low cost, and the ability to provide low temperatures very rapidly. Disadvantages include low efficiency and the requirement of a high-pressure gas source. The present investigation is concerned with a J-T minicryocooler which makes it possible to reach low temperatures very rapidly. The considered device has special design features, including a two-phase valve, a directly-wound fin tube, and a special combination of three heat exchangers. Attention is given to the thermodynamic cycle, a new heat exchanger for improving the capacity of minicryocoolers, and test data.

Xie, J. K.

25

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

SciTech Connect

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

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

2014-01-27

26

Electron line shape and transmission function of the KATRIN monitor spectrometer  

SciTech Connect

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

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

2013-12-30

27

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

28

Development of JT-60SA superconducting magnet system  

NASA Astrophysics Data System (ADS)

The upgrade of JT-60U magnet system to superconducting coils (JT-60SA) is progressing by both parties of Japanese government and European commission in the framework of the Broader Approach agreement. The magnet system for JT-60SA consists of 18 Toroidal Field (TF) coils, a Central Solenoid (CS) with four modules, six Equilibrium Field (EF) coils. The TF coil case encloses the winding pack and is the main structural component of the magnet system. The CS consists of four independent winding pack modules, which is support from the bottom of the TF coils. The six EF coils are attached to the TF coil cases through supports with flexible plates allowing radial displacements. The construction of CS and EF coils was started in 2008 by Japan Atomic Energy Agency (JAEA). The construction of TF coils will be started in 2009 by Fusion for Energy and European voluntary contributors. This paper introduces the design of the JT-60SA superconducting magnet system and activities for development of magnet components in Japan.

Yoshida, K.; Tsuchiya, K.; Kizu, K.; Murakami, H.; Kamiya, K.; Obana, T.; Takahata, K.; Peyrot, M.; Barabaschi, P.

2010-11-01

29

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

E-print Network

, and attracted women from near and far for 48 years. Both she and J.T. had a strong work ethic dedicated to customer service and quality. Their customers, known as "Margaret's Women," came from Dallas and other and J.T. encouraged leadership experiences for young women. Margaret's started a juniors department

Rock, Chris

30

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

NASA Astrophysics Data System (ADS)

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

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

2014-12-01

31

The materials aspects of the JT-60 device  

NASA Astrophysics Data System (ADS)

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

Hasiguti, R. R.; Tomabechi, K.

1984-05-01

32

MIXING STUDY FOR JT-71/72 TANKS  

SciTech Connect

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

Lee, S.

2013-11-26

33

Results of acoustic testing of the JT8D-109 refan engines  

NASA Technical Reports Server (NTRS)

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

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

1975-01-01

34

----~\\r-~-0~Jt...L. Z~~l~.  

E-print Network

and facilities provided for the easy removal of either fish or the rice crop. Additional features for harvest.', additional problems. ConcentratlC)J~ of the fish prior to harvestIng re- quires a draw-down of the \\\\';:.t, C/)I) RESERVOIRS FOR ~1) FISH-RICE FARMING ----~\\r- ~-0~Jt...L. Z~~l~.::d~-~~ ) #12;Fish farming

35

Recent results of LH experiments on the JT-60 tokamak  

Microsoft Academic Search

Recent lower hybrid current drive (LHCD), and heating (LHH) experiments on JT-60 are reported. The current drive product of neRpIRF approximately 12.5*1019 m-2 MA was achieved at the LH power of approximately 4.5 MW, and the CD efficiency, the energy confinement, the global power balance and the heat load on divertor plates were investigated in high power LHCD plasmas. Nearly

N. Akaoka; H. Akasaka; M. Akiba; N. Akino; T. Ando; K. Annou; T. Aoyagi; T. Arai; K. Arakawa; M. Araki; M. Azumi; S. Chiba; M. Dairaku; N. Ebisawa; T. Fujii; T. Fukuda; A. Funahashi; H. Furukawa; H. Gunji; K. Hamamatsu; M. Hanada; M. Hara; K. Haraguchi; H. Hiratsuka; T. Hirayama; S. Hiroki; K. Hiruta; M. Honda; H. Horiike; N. Hosogane; Y. Iida; T. Iijima; K. Ikeda; Y. Ikeda; T. Imai; T. Inoue; N. Isaji; M. Isaka; N. Isei; S. Ishida; K. Itami; N. Itige; T. Ito; T. Kakizaki; Y. Kamada; A. Kaminaga; T. Kaneko; M. Kawai; M. Kawabe; Y. Kawamata; Y. Kawano; K. Kikuchi; M. Kikuchi; H. Kimura; T. Kimura; H. Kishimoto; S. Kitamura; K. Kiyono; K. Kodama; Y. Koide; T. Koide; T. Kobayashi; M. Komata; I. Kondo; T. Kondo; S. Konoshima; H. Kubo; S. Kunieda; K. Kurihara; M. Kuriyama; M. Kusaka; Y. Kusama; T. Kushima; M. Maeno; T. Matoba; S. Matsuda; M. Matsukawa; M. Matsuoka; Y. Matsuzaki; Y. Miura; N. Miya; K. Miyachi; K. Miyake; Y. Miyo; M. Mizuno; K. Mogaki; S. Moriyama; Y. Murakami; M. Muto; M. Nagami; A. Nagashima; K. Nagashima; T. Nagashima; S. Nagaya; K. Nagayama; O. Naito; H. Nakamura; T. Nagafuji; H. Nemoto; M. Nemoto; Y. Neyatani; H. Ninomiya; N. Nishino; T. Nishitani; H. Nobusaka; H. Nomata; A. Oikawa; K. Obara; K. Odajima; N. Ogiwara; T. Ohga; Y. Ohara; H. Oohara; T. Ohshima; K. Ohta; M. Ohta; S. Ohuchi; Y. Ohuchi; H. Okumura; K. Omori; S. Omori; Y. Omori; T. Ozeki; M. Saegusa; N. Saitoh; A. Sakasai; S. Sakata; T. Sakuma; T. Sasajima; K. Satou; M. Satou; M. Sawahata; M. Seimiya; M. Seki; S. Seki; K. Shibanuma; M. Shimada; K. Shimizu; M. Shimizu; Y. Shimomura; S. Shinozaki; H. Shirai; H. Shirakata; M. Shitomi; K. Suganuma; T. Sugawara; T. Sugie; H. Sunaoshi; M. Suzuki; N. Suzuki; S. Suzuki; H. Tachibana; M. Takahashi; S. Takahashi; T. Takahashi; M. Takasaki; H. Takatsu; H. Takeuchi; A. Takeshita; T. Takizuka; S. Tamura; S. Tanaka; T. Tanaka; Y. Tanaka; T. Tani; M. Terakado; T. Terakado; K. Tobita; T. Totsuka; N. Toyoshima; T. Tsugita; S. Tsuji; Y. Tsukahara; M. Tsuneoka; K. Uehara; Y. Uramoto; H. Usami; K. Ushigusa; K. Usui; J. Yagyu; K. Yamagishi; M. Yamagiwa; M. Yamamoto; O. Yamashita; T. Yamazaki; K. Yokokura; K. Yokoyama; H. Yoshida; Z. Yoshida; R. Yoshino; Y. Yoshioka; I. Yonekawa; K. Watanabe

1990-01-01

36

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

37

Conceptual design of the JT-60SA cryogenic system  

NASA Astrophysics Data System (ADS)

The superconducting tokamak JT-60 Super Advanced (JT-60SA) is part of the Broader Approach Programme agreed between Europe and Japan. Among other in kind contributions, CEA is in charge of supplying the Cryogenic System which includes a Warm Compression Station, the Refrigerator Cold Box, the Auxiliary Cold Box, a compressed air station and the vacuum systems. The cryogenic system requires a refrigeration capacity of about 8 kW equivalent at 4.5 K. It will 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 between 80 K and 100 K. The contract for design, manufacture, installation and commissioning was signed between CEA and Air Liquide Advanced Technologies (AL-AT) in November 2012. The Cryogenic System shall be operational in 2016. The paper presents the main technical requirements and the limit of supply, the description of the process proposed by AL-AT, the main components, the preliminary layout and the interfaces at the JT-60SA Naka site.

Lamaison, V.; Beauvisage, J.; Fejoz, P.; Girard, S.; Gonvalves, R.; Gondé, R.; Heloin, V.; Michel, F.; Hoa, C.; Kamiya, K.; Roussel, P.; Vallet, J.-C.; Wanner, M.; Yoshida, K.

2014-01-01

38

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

E-print Network

. [1] The last deglaciation was interrupted by three major cooling events, the Younger Dryas estimated to last for months to a year, and the associated lake-drainage event is referred to as a floodImpact of floods versus routing events on the thermohaline circulation Katrin J. Meissner and Peter

Kurapov, Alexander

39

Monitoring of the operating parameters of the KATRIN Windowless Gaseous Tritium Source  

NASA Astrophysics Data System (ADS)

The KArlsruhe TRItium Neutrino (KATRIN) experiment will measure the absolute mass scale of neutrinos with a sensitivity of m? = 200 meV/c2 by high-precision spectroscopy close to the tritium ?-decay endpoint at 18.6 keV. Its Windowless Gaseous Tritium Source (WGTS) is a ?-decay source of high intensity (1011 s-1) and stability, where high-purity molecular tritium at 30 K is circulated in a closed loop with a yearly throughput of 10 kg. To limit systematic effects the column density of the source has to be stabilized at the 10-3 level. This requires extensive sensor instrumentation and dedicated control and monitoring systems for parameters such as the beam tube temperature, injection pressure, gas composition and so on. In this paper, we give an overview of these systems including a dedicated laser-Raman system as well as several ?-decay activity monitors. We also report on the results of the WGTS demonstrator and other large-scale test experiments giving proof-of-principle that all parameters relevant to the systematics can be controlled and monitored on the 10-3 level or better. As a result of these works, the WGTS systematics can be controlled within stringent margins, enabling the KATRIN experiment to explore the neutrino mass scale with the design sensitivity.

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

2012-10-01

40

Present status and future prospects of the JT-60SA project  

NASA Astrophysics Data System (ADS)

The JT-60SA project has been implemented jointly by Europe and Japan since June 2007. After the disassembly of JT-60 from the torus hall had been completed in October 2012, the project achieved the major milestone of starting the tokamak's assembly at the JAEA Naka site in January 2013 following the completion of the cryostat base in Europe and its transport to Japan. Procurement and assembly activities for components such as the superconducting magnet, cryogenic system, power supply, vacuum vessel, divertor and cryostat are progressing on track towards the start of operation in March 2019. In preparation for exploitation, the JT-60SA Research Plan was issued in December 2011, and the research integration activities are addressing JT-60SA data management, validation and analysis tools. This paper overviews the latest evolution of the project in terms of construction and exploitation for JT-60SA.

Ishida, S.; Barabaschi, P.; Kamada, Y.

2014-10-01

41

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

NASA Technical Reports Server (NTRS)

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

Reed, D. H.

1974-01-01

42

High-voltage monitoring with a solenoid retarding spectrometer at the KATRIN experiment  

NASA Astrophysics Data System (ADS)

The KATRIN experiment will measure the absolute mass scale of neutrinos with a sensitivity of m? = 200meV/c2 by means of an electrostatic spectrometer set close to the tritium ?-decay endpoint at 18.6keV. Fluctuations of the energy scale must be under control within ±60mV (±3ppm). Since a precise voltage measurement in the range of tens of kV is on the edge of current technology, a nuclear standard will be deployed additionally. Parallel to the main spectrometer the same retarding potential will be applied to the monitor spectrometer to measure 17.8-keV K-conversion electrons of 83mKr. This article describes the setup of the monitor spectrometer and presents its first measurement results.

Erhard, M.; Bauer, S.; Beglarian, A.; Bergmann, T.; Bonn, J.; Drexlin, G.; Goullon, J.; Groh, S.; Glück, F.; Kleesiek, M.; Haußmann, N.; Höhn, T.; Johnston, K.; Kraus, M.; Reich, J.; Rest, O.; Schlösser, K.; Schupp, M.; Slezák, M.; Thümmler, T.; Vénos, D.; Weinheimer, C.; Wüstling, S.; Zbo?il, M.

2014-06-01

43

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

44

Background due to stored electrons following nuclear decays in the KATRIN spectrometers and its impact on the neutrino mass sensitivity  

E-print Network

The KATRIN experiment is designed to measure the absolute neutrino mass scale with a sensitivity of 200 meV at 90% C.L. by high resolution tritium beta-spectroscopy. A low background level of 10 mHz at the beta-decay endpoint is required in order to achieve the design sensitivity. In this paper we discuss a novel background source arising from magnetically trapped keV electrons in electrostatic retarding spectrometers. The main sources of these electrons are alpha-decays of the radon isotopes (219,220)Rn as well as beta-decays of tritium in the volume of the spectrometers. We characterize the expected background signal by extensive MC simulations and investigate the impact on the KATRIN neutrino mass sensitivity. From these results we refine design parameters for the spectrometer vacuum system and propose active background reduction methods to meet the stringent design limits for the overall background rate.

Mertens, S; Fraenkle, F M; Furse, D; Glueck, F; Goerhardt, S; Hoetzel, M; Kaefer, W; Leiber, B; Thuemmler, T; Wandkowsky, N; Wolf, J

2012-01-01

45

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

46

JT8D high pressure compressor performance improvement  

NASA Technical Reports Server (NTRS)

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

Gaffin, W. O.

1981-01-01

47

Long Pulse Operation on NBI Systems for JT-60U  

SciTech Connect

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

Akino, N.; Ebisawa, N. [Japan Atomic Energy Resaerch Institute (Japan); Honda, A. [Japan Atomic Energy Resaerch Institute (Japan); Ikeda, Y. [Japan Atomic Energy Resaerch Institute (Japan); Kawai, M. [Japan Atomic Energy Resaerch Institute (Japan); Kazawa, M. [Japan Atomic Energy Resaerch Institute (Japan); Mogaki, K. [Japan Atomic Energy Resaerch Institute (Japan); Ohga, T. [Japan Atomic Energy Resaerch Institute (Japan); Umeda, N. [Japan Atomic Energy Resaerch Institute (Japan); Usui, K. [Japan Atomic Energy Resaerch Institute (Japan); Yamamoto, T. [Japan Atomic Energy Resaerch Institute (Japan); Grisham, L. [Princeton Plasma Physics Laboratory (United States)

2005-04-15

48

Dimensionless pedestal identity experiments in JT-60U and JET in ELMy H-mode plasmas  

Microsoft Academic Search

This paper reports the first results of collaborative experiments in JT-60U and JET to compare ELMy H-mode characteristics in the two machines. The JT-60U\\/JET identity experiments were aimed explicitly at matching edge pedestal parameters in plasmas of the same geometry. The similar size of the two devices allows plasma configurations and conditions to be established for which the match of

G Saibene; T Hatae; D J Campbell; J G Cordey; E de la Luna; C Giroud; K Guenther; Y Kamada; M A H Kempenaars; A Loarte; J Lönnroth; D Mc Donald; M F F Nave; N Oyama; V Parail; R Sartori; J Stober; T Suzuki; M Takechi; K Toi

2004-01-01

49

High ion temperatures and transport characteristics of high Zeff hydrogen plasmas in JT-60 limiter discharges  

Microsoft Academic Search

Ion temperatures around 10 keV were obtained in JT-60 limiter plasmas by high power neutral beam heating (H0 ? H+), which is much higher than the maximum value of 6.6 keV obtained in JT-60 diverted plasmas. The experiment was performed in the parameter region of Ip = 1?2 MA, n?e (before heating) = (0.7?1.5)×1019 m?3, n?e (end of heating) =

N. Hosogane; K. Shimizu; H. Shirai; Y. Kusama; K. Tobita; M. Nemoto; A. Sakasai; Y. Koide; K. Nagashima; H. Yoshida

1988-01-01

50

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

Microsoft Academic Search

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

R. Yoshino; Y. Nakamura; Y. Neyatani

1996-01-01

51

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

NASA Technical Reports Server (NTRS)

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

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

1974-01-01

52

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

NASA Technical Reports Server (NTRS)

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

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

1975-01-01

53

Achievement and improvement of the JT-60U negative ion source for JT-60 Super Advanced (invited)  

SciTech Connect

Developments of the large negative ion source have been progressed in the high-energy, high-power, and long-pulse neutral beam injector for JT-60 Super Advanced. Countermeasures have been studied and tested for critical issues of grid heat load and voltage holding capability. As for the heat load of the acceleration grids, direct interception of D{sup -} ions was reduced by adjusting the beamlet steering. As a result, the heat load was reduced below an allowable level for long-pulse injections. As for the voltage holding capability, local electric field was mitigated by tuning gap lengths between large-area acceleration grids in the accelerator. As a result, the voltage holding capability was improved up to the rated value of 500 kV. To investigate the voltage holding capability during beam acceleration, the beam acceleration test is ongoing with new extended gap.

Kojima, A.; Hanada, M.; Tanaka, Y.; Inoue, T.; Watanabe, K.; Taniguchi, M.; Kashiwagi, M.; Umeda, N.; Tobari, H. [Japan Atomic Energy Agency, Naka, Ibaraki 311-0193 (Japan); Grisham, L. R. [Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States); Collaboration: JT-60 NBI Group

2010-02-15

54

Achievement and improvement of the JT-60U negative ion source for JT-60 Super Advanced (invited)a)  

NASA Astrophysics Data System (ADS)

Developments of the large negative ion source have been progressed in the high-energy, high-power, and long-pulse neutral beam injector for JT-60 Super Advanced. Countermeasures have been studied and tested for critical issues of grid heat load and voltage holding capability. As for the heat load of the acceleration grids, direct interception of D- ions was reduced by adjusting the beamlet steering. As a result, the heat load was reduced below an allowable level for long-pulse injections. As for the voltage holding capability, local electric field was mitigated by tuning gap lengths between large-area acceleration grids in the accelerator. As a result, the voltage holding capability was improved up to the rated value of 500 kV. To investigate the voltage holding capability during beam acceleration, the beam acceleration test is ongoing with new extended gap.

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

2010-02-01

55

Achievement and improvement of the JT-60U negative ion source for JT-60 Super Advanced (invited).  

PubMed

Developments of the large negative ion source have been progressed in the high-energy, high-power, and long-pulse neutral beam injector for JT-60 Super Advanced. Countermeasures have been studied and tested for critical issues of grid heat load and voltage holding capability. As for the heat load of the acceleration grids, direct interception of D- ions was reduced by adjusting the beamlet steering. As a result, the heat load was reduced below an allowable level for long-pulse injections. As for the voltage holding capability, local electric field was mitigated by tuning gap lengths between large-area acceleration grids in the accelerator. As a result, the voltage holding capability was improved up to the rated value of 500 kV. To investigate the voltage holding capability during beam acceleration, the beam acceleration test is ongoing with new extended gap. PMID:20225407

Kojima, A; Hanada, M; Tanaka, Y; Inoue, T; Watanabe, K; Taniguchi, M; Kashiwagi, M; Umeda, N; Tobari, H; Grisham, L R

2010-02-01

56

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

E-print Network

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

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

2013-01-01

57

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

NASA Astrophysics Data System (ADS)

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

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

2013-10-01

58

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

NASA Technical Reports Server (NTRS)

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

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

1982-01-01

59

Oxygen chemisorption compressor study for cryogenic J-T refrigeration  

NASA Technical Reports Server (NTRS)

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

Jones, Jack A.; Blue, Gary D.

1987-01-01

60

The JT9D Jet Engine Diagnostics Program  

NASA Technical Reports Server (NTRS)

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

Olsson, W. J.

1982-01-01

61

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

62

Present knowledge about the materials behavior in JT-60  

NASA Astrophysics Data System (ADS)

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

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

1988-07-01

63

Antimisting kerosene JT3 engine fuel system integration study  

NASA Technical Reports Server (NTRS)

An analytical study and laboratory tests were conducted to assist NASA in determining the safety and mission suitability of the modified fuel system and flight tests for the Full-Scale Transport Controlled Impact Demonstration (CID) program. This twelve-month study reviewed and analyzed both the use of antimisting kerosene (AMK) fuel and the incorporation of a fuel degrader on the operational and performance characteristics of the engines tested. Potential deficiencies and/or failures were identified and approaches to accommodate these deficiencies were recommended to NASA Ames -Dryden Flight Research Facility. The result of flow characterization tests on degraded AMK fuel samples indicated levels of degradation satisfactory for the planned missions of the B-720 aircraft. The operability and performance with the AMK in a ground test engine and in the aircraft engines during the test flights were comparable to those with unmodified Jet A. For the final CID test, the JT-3C-7 engines performed satisfactorily while operating on AMK right up to impact.

Fiorentino, A.

1987-01-01

64

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

E-print Network

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

Washington at Seattle, University of

65

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

Federal Register 2010, 2011, 2012, 2013, 2014

...would require removing certain high-pressure compressor (HPC) shafts before...shaft. These engines have the highest-thrust rating of the JT9D models...JT9D-7R4H1 turbofan engines with a high-pressure compressor (HPC) shaft,...

2011-07-13

66

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

NASA Astrophysics Data System (ADS)

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

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

2010-04-01

67

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

NASA Astrophysics Data System (ADS)

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

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

2011-06-01

68

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

SciTech Connect

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

Zboril, Miroslav [Westfaelische Wilhelms-Universitaet Muenster, Institut fuer Kernphysik, Wilhelm-Klemm-Str. 9, D-48149 Muenster (Germany); Nuclear Physics Institute of the ASCR, p. r. i., CZ-25068 Rez (Czech Republic); Collaboration: KATRIN Collaboration

2011-12-16

69

Present status of the negative ion based neutral beam injector for JT-60U  

NASA Astrophysics Data System (ADS)

The negative ion based neutral beam injector heating system for JT-60U has contributed to core plasma heating and noninductive current drive experiments on JT-60U. For increasing further the beam power and beam pulse duration, the serious issue is improvement of source plasma nonuniformity in the ion source. Various countermeasures have been devised to solve the nonuniformity. The first is to adjust the spatial distribution of the arc discharge through regulating the arc current limiting resistors to be connected in series to each of the filament groups. The second is to change the arc discharge mode through controlling the filament temperature. These measures have been found to be very effective.

Ohga, T.; Umeda, N.; Akino, N.; Ebisawa, N.; Grisham, L.; Hikita, S.; Honda, A.; Itoh, T.; Kawai, M.; Kazawa, M.; Kuriyama, M.; Kusaka, M.; Mogaki, K.; Oohara, H.; Pengyuan, L.; Satoh, F.; Seki, H.; Tanai, Y.; Toyokawa, Y.; Usui, K.; Yamamoto, T.; Yamazaki, H.

2002-02-01

70

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

71

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

E-print Network

power systems,1 as reported, e.g., in the Japan Atomic Energy Research Institute Tokamak-60 Upgrade JT-in-cell simulations of a negative neutral beam heated Alfvén-mode experiment in the Japan Atomic Energy Research K. Shinohara, M. Ishikawa, and M. Takechi Japan Atomic Energy Agency, Naka, Ibaraki 311-0193, Japan

Zonca, Fulvio

72

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

Federal Register 2010, 2011, 2012, 2013, 2014

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

2011-11-22

73

Mechanical assessment of the JT-60SA TF Coils during seismic event  

Microsoft Academic Search

JT-60SA is a fusion experiment designed to contribute to the early realization of fusion energy, by providing support to the operation of ITER, by addressing key physics issues for ITER and DEMO and by investigating how to optimize the operation of the next fusion power plants. It is a combined project of Japan and Europe Satellite Tokamak Program, as part

Lionel Meunier; Pietro Barabaschi; Valerio Tomarchio

2011-01-01

74

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

NASA Technical Reports Server (NTRS)

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

1975-01-01

75

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

NASA Astrophysics Data System (ADS)

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

Tzabar, Nir

2014-01-01

76

The H-mode pedestal, ELMs and TF ripple effects in JT-60U\\/JET dimensionless identity experiments  

Microsoft Academic Search

This paper summarizes 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, the plasma minor radius a is the same in JET and JT-60U). Power and density scans were

G. Saibene; N. Oyama; J. Lönnroth; Y. Andrew; E. de la Luna; C. Giroud; G. T. A. Huysmans; Y. Kamada; M. A. H. Kempenaars; A. Loarte; D. McDonald; M. M. F. Nave; A. Meiggs; V. Parail; R. Sartori; S. Sharapov; J. Stober; T. Suzuki; M. Takechi; K. Toi; H. Urano

2007-01-01

77

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

NASA Astrophysics Data System (ADS)

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

Zhang, Burt; Larson, Melora; Rodriguez, Jose

2010-09-01

78

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

NASA Technical Reports Server (NTRS)

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

Gaffin, W. O.

1980-01-01

79

Development of TiC coated wall materials for JT-60  

NASA Astrophysics Data System (ADS)

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

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

1985-08-01

80

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

81

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

Microsoft Academic Search

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

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

2002-01-01

82

Edge pedestal characteristics in JET and JT-60U tokamaks under variable toroidal field ripple  

Microsoft Academic Search

The effects of toroidal field (TF) ripple on the edge pedestal characteristics were examined in the TF ripple scan experiments at the plasma current Ip of 1.1 MA in JET and JT-60U. The TF ripple amplitude deltaR was defined as a value averaged over the existing ripple wells at the separatrix on the outer midplane. By the installation of ferritic

H. Urano; G. Saibene; N. Oyama; V. Parail; P. de Vries; R. Sartori; Y. Kamada; K. Kamiya; A. Loarte; J. Lönnroth; Y. Sakamoto; A. Salmi; K. Shinohara; H. Takenaga; M. Yoshida; JET EFDA Contributers

2011-01-01

83

Status of HTS current leads for WENDELSTEIN 7-X and JT-60SA  

Microsoft Academic Search

The stellarator WENDELSTEIN 7-X (W7-X) and the satellite tokamak JT-60SA will use High Temperature Superconductor (HTS) current leads to reduce cryogenic load and operational cost. Forschungszentrum Karlsruhe is in charge of design, construction and test of these HTS current leads. For W7-X fourteen current leads with a nominal current of 14kA and a maximum current of 18.2kA are required that

W. H. Fietz; R. Heller; A. Kienzler; R. Lietzow

2009-01-01

84

High Temperature Superconductor Current Leads for WENDELSTEIN 7-X and JT-60SA  

Microsoft Academic Search

Forschungszentrum Karlsruhe has taken over the responsibility for the design, construction and testing of the High Temperature Superconductor (HTS) current leads for two fusion experiments, i.e. the stellarator WENDELSTEIN 7-X (W7-X) and the satellite tokamak JT-60SA. W7-X is presently under construction at the Greifswald branch of the Max-Planck-Institute for Plasma Physics and consists of 50 non-planar and 20 planar coils

Walter H. Fietz; Reinhard Heller; Andreas Kienzler; Ralph Lietzow

2009-01-01

85

?>*)3>OOOlt>A -j^t I Ris-R-628(EN)  

E-print Network

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

86

Design and performance tests of gas circulation heating of JT-60U vacuum vessel  

Microsoft Academic Search

In the final stage of construction of the upgraded JAERI Tokamak-60 device (JT-60U), baking tests of the vacuum vessel were performed. The vessel torus was heated up to 300°C by means of the nitrogen gas circulation system and electric heaters mounted on the outboard solid wall of the vessel. The design of the gas flow channels inside the double-wall structure

M. Yotsuya; T. Masuzaki; H. Sago; M. Nishikane; T. Uchikawa; Y. Iritani; T. Murakami; H. Horiike; Y. Neyatani; H. Ninomiya; M. Matsukawa; T. Ando; K. Miyachi

1991-01-01

87

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

NASA Astrophysics Data System (ADS)

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

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

2014-09-01

88

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

Federal Register 2010, 2011, 2012, 2013, 2014

...MAN-JT8D-2-06, and the Engine Manual Chapter/Section...MAN-JT8D-2-06, and the Engine Manual Chapter/Section...72-33-21, Inspection 00. Definitions (i) For the purpose...is the induction of an engine into the shop for maintenance...Pratt & Whitney, 400 Main St., East...

2010-10-08

89

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

Federal Register 2010, 2011, 2012, 2013, 2014

...MAN-JT8D-2-06 and the Engine Manual Chapter/Section...JT8D-2-06 and the Engine Manual Chapter/Section...72-33-21, Inspection 00. Definitions (i) For the purpose...is the induction of an engine into the shop for maintenance...Pratt & Whitney, 400 Main St., East...

2010-05-19

90

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

NASA Technical Reports Server (NTRS)

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

1975-01-01

91

Addendum to papers from JT-60 NBI Group, published in Proceedings of the 13th International Conference on Ion Sources, Gatlinburg, Tennessee, September 2009  

NASA Astrophysics Data System (ADS)

This addendum applies to two papers authored by contributors from the JT-60 NBI Group published in Proceedings of the 13th International Conference on Ion Sources, Gatlinburg, Tennessee, September 2009. This addendum provides the full list of JT-60 NBI Group and their affiliations.

Akino, N.; Usui, K.; Endo, Y.; Oasa, K.; Oshima, K.; Kazawa, M.; Kawai, M.; Kikuchi, K.; Kojima, A.; Komata, M.; Sasaki, S.; Simizu, T.; Seki, N.; Nemoto, S.; Tanaka, Y.; Noto, K.; Hanada, M.; Mogaki, K.

2010-02-01

92

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

NASA Astrophysics Data System (ADS)

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

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

2015-03-01

93

Cryogenic performance and numerical modeling of a helium refrigerator for the JT-60SA coil test facility  

NASA Astrophysics Data System (ADS)

In the framework of the JT-60SA project, a cryogenic loop, dedicated to the tests of the JT-60SA Toroidal Field Coils, is planned to be installed at CEA Saclay. To analyze the dynamic thermal behavior of the cryogenic loop and to optimize the cryogenic process control of the coil test facility, dynamic simulations will be carried out with the software EcosimPro. This paper deals with the validation of the software. Experimental power measurements in pure refrigeration on a helium refrigerator have been compared to computations. Results are close and allow validating the software. The modeling of the JT-60SA CTF cryogenic test loop is also described in order to give an overview of the next computations.

Serrand, Alexandre; Abdel-Maksoud, Walid; Genini, Laurent; Juster, François-Paul

2014-01-01

94

Improvement of beam performance in the negative-ion based NBI system for JT-60U  

NASA Astrophysics Data System (ADS)

The injection performance of the negative-ion based NBI (N-NBI) system for JT-60U has been improved by correcting beamlet deflection and improving spatial uniformity of negative ion production. Beamlet deflection at the peripheral region of the grid segment due to the distorted electric field at the bottom of the extractor has been observed. This was corrected by modifying the surface geometry at the extractor to form a flat electric field. Moreover, beamlet deflection due to beamlet-beamlet repulsion caused by space charge was also compensated for by extruding the edge of the bottom extractor. This resulted in a reduction of the heat loading on the NBI port limiter. As a result of the improvement above, continuous injection of a 2.6 MW H0 beam at 355 keV has been achieved for 10 s. Thus, long pulse injection up to the nominal pulse duration of JT-60U was demonstrated. This has opened up the prospect of long pulse operation of the negative-ion based NBI system for a steady-state tokamak reactor. So far, a maximum injection power of 5.8 MW at 400 keV, with a deuterium beam, and 6.2 MW at 381 keV, with a hydrogen beam, have been achieved in the JT-60U N-NBI. Uniformity of negative ion production was improved by tuning the filament emission current so as to direct more arc power into the region where less negative ion current was extracted.

Umeda, N.; Grisham, L. R.; Yamamoto, T.; Kuriyama, M.; Kawai, M.; Ohga, T.; Mogaki, K.; Akino, N.; Yamazaki, H.; Usui, K.; Honda, A.; Guangjiu, L.; Watanabe, K.; Inoue, T.; Hanada, M.; Kashiwagi, M.; Morishita, T.; Dairaku, M.; Takayanagi, T.

2003-07-01

95

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

96

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

NASA Technical Reports Server (NTRS)

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

Janus, A. S.

1981-01-01

97

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

NASA Astrophysics Data System (ADS)

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

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

1997-11-01

98

JT90 Ceramic Outer Air Seal System Refinement Program, Phase 2  

NASA Technical Reports Server (NTRS)

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

Shiembob, L. T.

1982-01-01

99

Transient Heat Transport in Subcooled He II Associated with JT Effect  

NASA Astrophysics Data System (ADS)

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

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

2004-06-01

100

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

NASA Astrophysics Data System (ADS)

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

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

2009-08-01

101

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

NASA Technical Reports Server (NTRS)

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

1975-01-01

102

Advanced tokamak research on long time scales in JT-60 Upgrade  

SciTech Connect

The duration of advanced tokamak plasma operation in JT-60 Upgrade (JT-60U) [A. Kitsunezaki et al., Fusion Sci. Technol. 42, 179 (2002)] has been extended on long time scales exceeding the current diffusion time ({tau}{sub R}) and close to the wall saturation time. A very high bootstrap current fraction (f{sub BS}) of 75% was maintained for 7.4 s (2.7{tau}{sub R}), while a normalized beta of 2.5 was maintained for 15.5 s ({approx}9.5{tau}{sub R}). The current profile reaches stationary conditions in {approx}{tau}{sub R} for the small f{sub BS} regime, while a longer time is required for the large f{sub BS} regime. A plasma with a weak shear q profile, similar to requirements for the ITER steady-state operational scenario, was successfully maintained. The particle inventory in the wall was observed to saturate in repeated long-pulse ({approx}30 s) H-mode discharges with edge localized modes. The analysis of neutral particles in the scrape-of-layer plasma indicates different time scales are involved for the wall saturation. Ferritic steel tiles have been installed in the vacuum vessel to reduce the toroidal field ripple towards extending the advanced tokamak regime further in the coming operational campaign.

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

2006-05-15

103

Power flow in the negative-ion based neutral beam injection for JT-60  

NASA Astrophysics Data System (ADS)

The negative ion based neutral beam injection system for JT-60 has operated since 1996 injecting neutral beam into JT-60 plasmas. A power flow measurement in the beam line and ion source with a water calorimeter had shown that 40%-50% of accelerated beam particles were intercepted on the two accelerator grids and the grounded grid at an ion source gas pressure of 0.2-0.3 Pa. Much of the beam loss was not caused by stripping loss of the negative ions, but rather by direct impingement of the negative ions onto the grids. After reducing the acceleration area by masking the edge area (about 13% of the extraction area) of the accelerator grid so as to minimize the edge effect of magnetic field in the arc chamber, the loss in the accelerator decreased by roughly 25%. In comparing a deuterium beam with a hydrogen beam, the neutral beam power with deuterium is lower by 30% than that of hydrogen at the same arc power, although the heat load onto the grounded grid does not change so much. The power deposition ratios along the beamline were as follows: the beam scraper in the ion source tank and the neutralizer cell received about 3% and about 7%, respectively, of the accelerated beam power, while the ion dumps for both D- and D+ received 20%-30% in total, and 30%-34% reached the neutral beam calorimeter.

Kuriyama, M.; Akino, N.; Ebisawa, N.; Grisham, L.; Hikita, S.; Honda, A.; Itoh, T.; Kawai, M.; Kazawa, M.; Kusaka, M.; Mogaki, K.; Ohga, T.; Okumura, Y.; Oohara, H.; Satoh, F.; Seki, H.; Tanai, Y.; Toyokawa, Y.; Umeda, N.; Usui, K.; Watanabe, K.; Yamaguchi, M.; Yamazaki, H.

2000-02-01

104

JT9D performance deterioration results from a simulated aerodynamic load test  

NASA Technical Reports Server (NTRS)

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

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

1981-01-01

105

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

NASA Astrophysics Data System (ADS)

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 gradient can be reproduced by introducing a residual stress term proportional to the momentum diffusivity and the pressure gradient. Also, the momentum diffusivity in an internal transport barrier (ITB) region was reduced to an order similar to that of the ion thermal diffusivity. A comparison of the edge pedestal characteristics between JT-60U and JET with matched shape and operational parameters showed that the edge pressure did not change with increasing toroidal field (TF) ripple up to 1%, whereas a linear shift of the rotation velocity to the counter-direction was observed with increasing TF ripple. The absolute evaluation of tungsten accumulation in the core plasma by a spectroscopic method clarified that tungsten accumulation increased with increasing toroidal rotation in the counter-direction while an H-mode was sustained even at a tungsten density of 10-3 times the electron density. Active control of neoclassical tearing mode (NTM) islands by the electron cyclotron current drive showed that the growth of NTM islands decelerated the plasma rotation. A transition to a low-rotation frequency state occurred for larger NTM islands. A statistical analysis of the precursor of type I ELM showed a small growth rate of ?/?A ~ 10-3 (where ? and ?A are the growth rate and Alfvén angular frequency, respectively). The measurement of the precursor at different toroidal locations showed that the toroidal mode number was 8-10 or 14-16. Energetic-particle-driven wall modes (EWMs) were found to trigger ELMs and decrease the ELM amplitude to half of that without EWMs. Enhancement of the ELM frequency by electron cyclotron heating in the edge region of the high-field side was observed, and the frequency increase was four times than that of neutral beam injection cases having the same absorption power. Laser scattering measurement of carbon dust generation showed that the dust distribution had a peak in the far scrape-off layer and penetration into the core plasma was not significant. Depth profile measurements of deuterium and carbon in tungsten-coated tiles (tungsten thickness: 50 µm) determined that the ratio of deuterium to carbon was 0.06 ± 0.02 over a 20 µm depth, suggesting deuterium trapping by carbon in the tungsten layer. Furthermore, new records for both the beam energy of negative-ion-based neutral beams (507 keV) and the output power of 110 GHz electron cyclotron waves (1.5 MW for 4 s from one gyrotron) were achieved, which confirmed and extended the heating and current drive capabilities of ITER and JT-60SA.

Isayama, A.; JT-60 Team

2011-09-01

106

Improvement of energy confinement of neutral beam heated plasma by lower hybrid current drive in JT-60  

Microsoft Academic Search

Energy and particle confinements in a high power neutral beam heated plasma are improved by a lower hybrid current drive (LHCD) in JT-60. A clear correlation between the improvement of the energy confinement time and the decrease of the plasma internal inductance caused by LHCD is observed. The energy confinement time of the profile-controlled plasma by LHCD is close to

Kenkichi Ushigusa; Takeshi Imai; Ryuji Yoshino

1987-01-01

107

Advanced Real-Time Feedback Control in JT-60U High Performance Discharges for Application to Fusion Reactor Plasmas  

Microsoft Academic Search

The significance of real-time feedback control is emphasized in this paper as an indispensable method to improve and sustain the improved plasma characteristics in JT-60U high fusion performance discharges as well as to operate the fusion reactor under the optimal divertor conditions with respect to the heat load and exhaust pumping. In accordance, substantial improvement in the equivalent fusion amplification

T. Fukuda; T. Oikawa; S. Takeji; A. Isayama; Y. Kawano; Y. Neyatani; A. Nagashima; T. Nishitani; S. Konoshima; H. Tamai; T. Fujita; Y. Sakamoto; Y. Kamada; S. Ide; Y. Koide; H. Takenaga; K. Kurihara; S. Sakata; T. Ozeki; Y. Kawamata; Y. M. Miura

2002-01-01

108

Steering of Multiple Beamlets in the JT-60 U Negative Ion Source  

SciTech Connect

The direct interception of D{sup -} ion beam by the acceleration grid was reduced by modifying field shaping plates (FSPs) in JT-60 negative ion sources to inject powerful neutral beams for long pulse duration of >10 s. The modified FSPs are designed by a 3D simulation code to properly steer the outermost beamlets that are deflected outward by space charge of the inward beamlets. The measured steering angles were -1.2 mrad and -6.4/-4.5 mrad in the vertical and horizontal direction, which were in agreement with the designed value calculated by the 3D simulation code. The proper steering of the outermost beamlets allowed a significant reduction of the power loading of the grounded grid. The power loading was successfully reduced to an allowable level of 5% with respect to the acceleration beam power.

Kamada, Masaki; Hanada, Masaya; Ikeda, Yoshitaka [Japan Atomic Energy Agency, 801-1 Mukoyama, Naka, Ibaraki 311-0193 (Japan); Grisham, Larry R. [Princeton Plasma Physics laboratory, P.O. Box 451, Princeton, New Jersey 08543 (United States)

2009-03-12

109

Study of plasma uniformity on JT-60U negative ion source  

SciTech Connect

The negative ion source developed at JAERI for the N-NBI was intended to accelerate a 500 keV, 22 A D- beam for 10 s. Two of these ion sources are mounted in the beamline. It has been found that the spatial uniformity of the source plasma is not as good as expected in the design phase of the negative ion sources for JT-60U. The source plasma uniformity has been estimated through measuring spatial distributions of the arc current flowing into each filament group and also the ion saturation current with Langmuir probes placed at ten positions around the extraction area of the plasma grid. We then altered the relative values of the arc current-limiting resistors to the eight filament groups in each source to balance the arc. As a result of the optimization of the arc resistors, the nonuniformity of the source plasma has been reduced. (c) 2000 American Institute of Physics.

Kawai, M. [Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, Naka-gun, Ibaraki-ken, 311-0193, (Japan)] [Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, Naka-gun, Ibaraki-ken, 311-0193, (Japan); Grisham, L. [Princeton Plasma Physics Laboratory, Princeton New Jersey, 08543 (United States)] [Princeton Plasma Physics Laboratory, Princeton New Jersey, 08543 (United States); Itoh, T. [Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, Naka-gun, Ibaraki-ken, 311-0193, (Japan)] [Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, Naka-gun, Ibaraki-ken, 311-0193, (Japan); Kazawa, M. [Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, Naka-gun, Ibaraki-ken, 311-0193, (Japan)] [Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, Naka-gun, Ibaraki-ken, 311-0193, (Japan); Kuriyama, M. [Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, Naka-gun, Ibaraki-ken, 311-0193, (Japan)] [Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, Naka-gun, Ibaraki-ken, 311-0193, (Japan); Mogaki, K. [Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, Naka-gun, Ibaraki-ken, 311-0193, (Japan)] [Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, Naka-gun, Ibaraki-ken, 311-0193, (Japan); Okumura, Y. [Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, Naka-gun, Ibaraki-ken, 311-0193, (Japan)] [Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, Naka-gun, Ibaraki-ken, 311-0193, (Japan); Watanabe, K. [Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, Naka-gun, Ibaraki-ken, 311-0193, (Japan)] [Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, Naka-gun, Ibaraki-ken, 311-0193, (Japan)

2000-02-01

110

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

SciTech Connect

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

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

1997-11-01

111

Steering of Multiple Beamlets in the JT-60 U Negative Ion Source  

NASA Astrophysics Data System (ADS)

The direct interception of D? ion beam by the acceleration grid was reduced by modifying field shaping plates (FSPs) in JT-60 negative ion sources to inject powerful neutral beams for long pulse duration of >10 s. The modified FSPs are designed by a 3D simulation code to properly steer the outermost beamlets that are deflected outward by space charge of the inward beamlets. The measured steering angles were ?1.2 mrad and ?6.4/?4.5 mrad in the vertical and horizontal direction, which were in agreement with the designed value calculated by the 3D simulation code. The proper steering of the outermost beamlets allowed a significant reduction of the power loading of the grounded grid. The power loading was successfully reduced to an allowable level of 5% with respect to the acceleration beam power.

Kamada, Masaki; Hanada, Masaya; Ikeda, Yoshitaka; Grisham, Larry R.

2009-03-01

112

The 727 airplane target thrust reverser static performance model test for refanned JT8D engines  

NASA Technical Reports Server (NTRS)

The results of a scale model static performance test of target thrust reverser configurations for the Pratt and Whitney Aircraft JT8D-100 series engine are presented. The objective of the test was to select a series of suitable candidate reverser configurations for the subsequent airplane model wind tunnel ingestion and flight controls tests. Test results indicate that adequate reverse thrust performance with compatible engine airflow match is achievable for the selected configurations. Tapering of the lips results in loss of performance and only minimal flow directivity. Door pressure surveys were conducted on a selected number of lip and fence configurations to obtain data to support the design of the thrust reverser system.

Chow, C. T. P.; Atkey, E. N.

1974-01-01

113

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

114

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

NASA Technical Reports Server (NTRS)

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

Gaffin, W. O.

1979-01-01

115

Design study of a negative-ion based NBI system for JT-60U  

NASA Astrophysics Data System (ADS)

A high energy negative-ion based NBI system for JT-60U has been designed. The objective of the NBI system is to demonstrate mega-ampere level NB current drive and plasma core heating in a reactor-grade high density plasma. This is the first negative-ion based NBI system in the world. The required specifications of the NBI system are: a beam energy of 500 keV, an injection power of 10 MW, a beam pulse duration of 10 sec with a duty cycle of 1/60 and a beam species of deuterium or hydrogen. The neutral beam power of 10 MW is injected tangentially using one beam-line with two large negative-ion sources. The construction of the NBI system has been started, and will be operational in 1996.

Akino, Noboru; Araki, Masanori; Ebisawa, Noboru

1994-03-01

116

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

NASA Astrophysics Data System (ADS)

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

Sone, K.; Murakami, Y.

1984-05-01

117

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

PubMed

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

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

2010-10-01

118

Long pulse production of high current D- ion beams in the JT-60 negative ion sourcea)  

NASA Astrophysics Data System (ADS)

The first long pulse production of high power D- ion beams has been demonstrated in the JT-60 U negative ion sources, each of which was designed to produce 22A, 500keV D- ion beams. Voltage holding capability and the grid power loading were examined for long pulse production of high power D- ion beams. From the correlation between voltage holding and the light intensity of cathodoluminescence from the Fiber Reinforced Plastic insulators, the acceleration voltage for stable voltage holding capability was found to be less than 320-340kV where the light was sufficiently suppressed. By tuning the extraction voltage, the grid power loadings in the ion sources were decreased to the allowable levels for long pulse injection without a significant reduction of the beam power. After tuning the acceleration and extraction voltages, D- ion beams of 12.5 and 9.8A were produced at 340keV with cesium seeding at a rate of ˜14?g/s into the ion sources. The pulse duration of these D- ion beams was extended step by step, and then was successfully extended up to 18s without degradation of the negative ion production. The D- ion beams were neutralized to yield 3.6MW D0 beams by a gas cell, and then injected into the JT-60 U plasma. Further, a slight reduction of D- ion beam power allowed the longer injection duration of 21s at a D0 beam power of 3.2MW. The success in the long pulse production of a high power D- ion beam shows that negative ion beams can be produced during a few tens of seconds without degradations of negative ion production and the voltage holding in a large Cs-seeded negative ion source.

Hanada, M.; Kamada, M.; Akino, N.; Ebisawa, N.; Honda, A.; Kawai, M.; Kazawa, M.; Kikuchi, K.; Komata, M.; Mogaki, K.; Noto, K.; Ohshima, K.; Takenouchi, T.; Tanai, Y.; Usui, K.; Yamazaki, H.; Ikeda, Y.; Grisham, L. R.

2008-02-01

119

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

NASA Astrophysics Data System (ADS)

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

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

1989-04-01

120

Mobilization of Escherichia coli R1 silver-resistance plasmid pJT1 by Tn5Mob into Escherichia coli C600  

Microsoft Academic Search

Summary Escherichia coli Rl is an Ag+-resistant strain that, as we have shown recently, harbours at least two large plasmids, pJT1 (83 kb) and pJT2 (77 kb). Tn5-Mob was introduced into theE. coli Rl host replicon via conjugation on membrane filters. The transfer functions of plasmid RP4-4 were provided in this process and Tn5-Mob clones mated withE. coli C600 yielded

Mary-Ellen Starodub; Jack T. Trevors

1990-01-01

121

Study of improved confinement modes with edge and\\/or internal transport barriers on the Japan Atomic Energy Research Institute Tokamak60 Upgrade (JT-60U)  

Microsoft Academic Search

Two types of advanced tokamak scenarios, namely, high betap H-mode and reversed shear (RS) mode, are developed and studied extensively in Japan Atomic Energy Research Institute Tokamak-60 Upgrade (JT-60U) [S. Ide and the JT-60 Team, Phys. Plasmas 7, 1927 (2000)]. These plasmas have both an internal transport barrier (ITB) and an edge transport barrier (ETB). The goal of the recent

Y. Miura

2003-01-01

122

Effect of toroidal field ripple and toroidal rotation on H-mode performance and ELM characteristics in JET\\/JT-60U similarity experiments  

Microsoft Academic Search

The effect of the toroidal field (TF) ripple and edge toroidal rotation (VT) on H-mode and pedestal performance as well as on ELM characteristics are investigated both in JET and JT-60U using matched plasma shape. In JT-60U, the amplitude of TF ripple (deltar) was reduced from ~1.2% to ~0.5% (averaged value at BT = 2.2 T) after the installation of

N. Oyama; G. Saibene; Y. Kamada; K. Kamiya; A. Loarte; J. Lönnroth; V. Parail; Y. Sakamoto; A. Salmi; R. Sartori; K. Shinohara; H. Takenaga; H. Urano; P. de Vries; M. Yoshida; JET EFDA Contributors

2008-01-01

123

Improvement of voltage holding capability in the 500 keV negative ion source for JT-60SA  

SciTech Connect

Voltage holding capability of JT-60 negative ion source that has a large electrostatic negative ion accelerator with 45 cmx1.1 m acceleration grids was experimentally examined and improved to realize 500 keV, 22 A, and 100 s D{sup -} ion beams for JT-60 Super Advanced. The gap lengths in the acceleration stages were extended to reduce electric fields in a gap between the large grids and at the corner of the support flanges from the original 4-5 to 3-4 kV/mm. As a result, the voltage holding capability without beam acceleration has been successfully improved from 400 to 500 kV. The pulse duration to hold 500 kV reached 40 s of the power supply limitation.

Tanaka, Y.; Hanada, M.; Kojima, A.; Akino, N.; Shimizu, T.; Ohshima, K.; Inoue, T.; Watanabe, K.; Taniguchi, M.; Kashiwagi, M.; Umeda, N.; Tobari, H. [Japan Atomic Energy Agency, Naka, Ibaraki 311-0193 (Japan); Grisham, L. R. [Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States); Collaboration: JT-60 NBI Group

2010-02-15

124

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

PubMed

Voltage holding capability of JT-60 negative ion source that has a large electrostatic negative ion accelerator with 45 cm x 1.1 m acceleration grids was experimentally examined and improved to realize 500 keV, 22 A, and 100 s D- ion beams for JT-60 Super Advanced. The gap lengths in the acceleration stages were extended to reduce electric fields in a gap between the large grids and at the corner of the support flanges from the original 4-5 to 3-4 kV/mm. As a result, the voltage holding capability without beam acceleration has been successfully improved from 400 to 500 kV. The pulse duration to hold 500 kV reached 40 s of the power supply limitation. PMID:20225405

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

2010-02-01

125

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

NASA Technical Reports Server (NTRS)

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 potential formulation of the acoustic wave equation was employed in the program. For some single mode JT15D data, the theory and experiment are in good agreement for the far field radiation pattern as well as suppressor attenuation. Also, the computer program is used to simulate flight effects that cannot be performed on a ground static test stand.

Baumeister, K. J.; Horowitz, S. J.

1982-01-01

126

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

NASA Astrophysics Data System (ADS)

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

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

2010-02-01

127

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

128

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

NASA Technical Reports Server (NTRS)

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

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

1973-01-01

129

Introduction of a Saturated Bath in Vincenta Models: Application to the Cryogenic System for JT-60SA Tokamak  

NASA Astrophysics Data System (ADS)

The CEA is involved in large helium refrigeration applied to the future experimental fusion reactors (e.g. ITER or JT-60SA). Pulsed operation of such machines results in heat load variations which the refrigerators have to cope with. One solution to smooth pulsed loads is to use a large thermal buffer, and in the case of JT-60SA cryogenic system, a saturated thermal bath is one of the investigated solutions. A 1D thermo hydraulic model describing the cooling loop associated with TF (Toroidal Field) coils and TF casing has been developed using Vincenta code to calculate the heat load arriving to the buffer (saturated bath). However, the liquid helium buffer itself and its coupling with the primary loop was not modelized. This paper shows results obtained using the existing functionalities in Vincenta code to model a saturated bath. For very large bath volumes, bath temperature remains almost steady and the power removed is equal to those previously calculated. On the other side, for smaller buffer volumes (e.g. JT-60SA scheme), it has been found that the increase of temperature fluctuations does not vary proportionally with the decrease of the buffer volume.

Rousset, B.; Roussel, P.; Michel, F.; Hitz, D.

2010-04-01

130

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

NASA Astrophysics Data System (ADS)

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

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

2015-03-01

131

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

NASA Technical Reports Server (NTRS)

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

Olsson, W. J.

1982-01-01

132

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

NASA Technical Reports Server (NTRS)

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

Sallee, G. P.

1979-01-01

133

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

NASA Technical Reports Server (NTRS)

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

Sallee, G. P.

1978-01-01

134

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

NASA Technical Reports Server (NTRS)

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

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

1983-01-01

135

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

SciTech Connect

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

Kawai, M. [Naka Fusion Research Establishment (Japan); Akino, N. [Naka Fusion Research Establishment (Japan); Ebisawa, N. [Naka Fusion Research Establishment (Japan); Grisham, L. [Princeton Plasma Physics Laboratory (United States); Hanada, M. [Naka Fusion Research Establishment (Japan); Honda, A. [Naka Fusion Research Establishment (Japan); Inoue, T. [Naka Fusion Research Establishment (Japan); Kazawa, M. [Naka Fusion Research Establishment (Japan); Kikuchi, K. [Naka Fusion Research Establishment (Japan); Kuriyama, M. [Japan Atomic Energy Research Institute (Japan); Kusanagi, N. [Naka Fusion Research Establishment (Japan); Mogaki, K. [Naka Fusion Research Establishment (Japan); Noto, K. [Naka Fusion Research Establishment (Japan); Ohga, T. [Naka Fusion Research Establishment (Japan); Ooshima, K. [Naka Fusion Research Establishment (Japan); Tanai, Y. [Naka Fusion Research Establishment (Japan); Umeda, N. [Naka Fusion Research Establishment (Japan); Usui, K. [Naka Fusion Research Establishment (Japan); Yamamoto, T. [Naka Fusion Research Establishment (Japan); Yamazaki, H. [Naka Fusion Research Establishment (Japan); Watanabe, K. [Naka Fusion Research Establishment (Japan)

2003-09-15

136

Helium exhaust in divertor closure configuration with W-shaped divertor of JT-60U  

NASA Astrophysics Data System (ADS)

The W-shaped divertor of JT-60U was modified from inner-leg pumping to both-leg pumping. After the modification, the pumping rate was remarkably improved with both-leg pumping in a divertor-closure configuration, which means both separatrixes close to the divertor slots. In steady state, efficient helium exhaust was realized in a divertor-closure configuration with both-leg pumping in ELMy H-mode plasmas. A global particle confinement time of ? ?He=0.4 s and ? ?He/? E=3 was achieved in attached plasmas, well within the range generally considered necessary for successful operation of a future fusion reactor, such as ITER-FEAT. The helium exhaust efficiency in the divertor-closure configuration was extended by 45% as compared to the one with inner-leg pumping. In the high X-point configuration with both-leg pumping, the helium exhaust efficiency and the pumping rate of deuterium deteriorated because of the backflow through the outer slot.

Sakasai, A.; Takenaga, H.; Kubo, H.; Akino, N.; Higashijima, S.; Sakurai, S.; Tamai, H.; Itami, K.; Asakura, N.

2001-03-01

137

Beam acceleration test in negative-ion based NBI system for JT-60U  

NASA Astrophysics Data System (ADS)

Beam extraction and acceleration test in the Negative Ion Based Neutral Beam Injector for JT-60U has been started using one ion source that is designed to produce a 500 keV, 22 A D- ion beam. Deuterium negative ions are produced in a cesium-seeded semi-cylindrical plasma generator and accelerated by a multi-aperture three-stage electrostatic accelerator. In the preliminary experiment of beam acceleration, the D- ion beam of 13.5 A was successfully accelerated to 400 keV for a pulse duration of 0.12 s. The negative ion beam power was 5.4 MW. The operating gas pressure in the plasma generator was as low as 0.22 Pa. The highest energy beam of 460 keV, 2.4 A, 0.44 s was also obtained. The ratio of extracted electron current to extracted negative ion current is estimated Ie/ID-<1. It was confirmed that the electron leak from the extractor to the accelerator is suppressed efficiently by the effects of biassing, electron trapping gap and magnetic field.

Watanabe, K.; Akino, N.; Araki, M.; Ebisawa, N.; Fujiwara, Y.; Hanada, M.; Honda, A.; Inoue, T.; Itoh, T.; Kawai, M.; Kazawa, M.; Koizumi, J.; Kuriyama, M.; Miyamoto, K.; Miyamoto, N.; Mogaki, K.; Nagase, A.; Ohara, Y.; Ohga, T.; Okumura, Y.; Oohara, H.; Ohshima, K.; Satoh, F.; Takahashi, S.; Takenouchi, T.; Usami, H.; Usui, K.; Yamamoto, M.; Yamazaki, T.

1996-07-01

138

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

NASA Astrophysics Data System (ADS)

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

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

1984-12-01

139

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

SciTech Connect

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

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

2001-10-16

140

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

NASA Technical Reports Server (NTRS)

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

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

1980-01-01

141

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

NASA Astrophysics Data System (ADS)

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.; Kobayashi, S.; Yamano, Y.; Grisham, L. R.

2011-09-01

142

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

143

Helium exhaust in ELMy H-mode plasmas with W-shaped pumped divertor of JT-60U  

NASA Astrophysics Data System (ADS)

By injecting a neutral beam of 60 keV helium (He) atoms as central fueling of helium into the ELMy H-mode plasmas, helium exhaust has been studied in the W-shaped pumped divertor on JT-60U. Efficient He exhaust was realized by He pumping using argon frosted cryopumps in the JT-60U new divertor. The He fueling rate by He beam injection was balanced with He pumping. In steady state, good He exhaust capability was successfully demonstrated in attached ELMy H-mode plasmas. A global particle confinement time of ?* He=0.7 s and ?* He/ ?E=4 ( ?E: the energy confinement time) was achieved in attached plasmas, well within the range generally considered necessary for successful operation of a future fusion reactor, such as ITER. The enrichment factor of He was obtained to be about 1.0, which is five times larger than the ITER requirement of 0.2. Good He exhaust capability was also obtained in detached ELMy H-mode plasmas, which was comparable to one in attached plasmas. This result of the helium exhaust is sufficient to support a detached divertor operation on ITER.

Sakasai, A.; Takenaga, H.; Hosogane, N.; Sakurai, S.; Akino, N.; Kubo, H.; Higashijima, S.; Tamai, H.; Asakura, N.; Itami, K.; Shimizu, K.

144

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

E-print Network

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

Sydney, University of

145

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

E-print Network

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

White, Robert D.

146

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

E-print Network

INTEGRATION OF SQUID l/f NOISE AND ITS APPLICATION TO A SUPERCONDUCTING GYROSCOPE J.T. Anderson use this result to determine the angular readout sensi- tivity of a superconducting gyroscope in the gyroscope described below, but it has sometimes been erroneously claimed that 1/f noise cannot be integrated

Paris-Sud XI, Université de

147

Active Control of Inlet Noise on the JT15D Turbofan Engine  

NASA Technical Reports Server (NTRS)

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

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

1999-01-01

148

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

NASA Technical Reports Server (NTRS)

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

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

1980-01-01

149

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

NASA Technical Reports Server (NTRS)

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

Gaffin, W. O.

1979-01-01

150

Double-Null Divertor Design for JT-60SU, A 10-MA Class Long-Pulse Tokamak  

SciTech Connect

The design of a double-null divertor for use in JT-60SU is presented. The free-boundary equilibrium code EFIT is used to establish a symmetric highly triangular double-null plasma shape. The baffle shapes are highly contoured to match the equilibrium, with the plasma-facing surfaces intersecting the flux surfaces at steep angles in the regions of high heat flux. These contoured surfaces also provide a tightly baffled design with small-aperture pumping gaps near both the inner and outer divertor strike points. The gaps provide adequate throughput of D{sub 2} gas for active control of impurity entrainment at reasonable pressures. The structural design is shown to be consistent with both forces from disruptions and thermal stress during vacuum vessel bakeout.

West, W.P. [General Atomics (United States); Friend, M.E. [General Atomics (United States); Baxi, C.B. [General Atomics (United States); Humphreys, D.A. [General Atomics (United States); Leuer, J.A. [General Atomics (United States); Petrie, T.W. [General Atomics (United States); Reis, E.E. [General Atomics (United States); Ishida, S. [Japan Atomic Energy Research Institute (Japan); Kurita, G. [Japan Atomic Energy Research Institute (Japan); Neyatani, Y. [Japan Atomic Energy Research Institute (Japan); Sakasai, A. [Japan Atomic Energy Research Institute (Japan)

2001-01-15

151

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

SciTech Connect

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

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

2014-07-01

152

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

NASA Astrophysics Data System (ADS)

Fermilab Vertical Test Stand-1 (VTS-1) has been in operation since 2007 for testing superconducting radio frequency (SCRF) cavities at 2 K. This test stand includes a heat exchanger consisting of a single layer; helically wound finned tube, upstream of the J-T valve. A finite difference thermal model has been developed in Engineering Equation Solver (EES) to study the thermal performance of this heat exchanger during refilling of the test stand. The model can predict heat exchanger performance under various other operating conditions and is therefore useful as a design tool for similar heat exchangers in other facilities. The present paper discusses the different operational modes of this heat exchanger and its thermal characteristics under these operational modes. Results of this model have been compared with experimental data gathered from the VTS-1 heat exchanger, and they are in good agreement with the present model.

Gupta, Prabhat Kumar; Rabehl, Roger

2014-07-01

153

Long pulse production of high current D{sup -} ion beams in the JT-60 negative ion source  

SciTech Connect

The first long pulse production of high power D{sup -} ion beams has been demonstrated in the JT-60 U negative ion sources, each of which was designed to produce 22 A, 500 keV D{sup -} ion beams. Voltage holding capability and the grid power loading were examined for long pulse production of high power D{sup -} ion beams. From the correlation between voltage holding and the light intensity of cathodoluminescence from the Fiber Reinforced Plastic insulators, the acceleration voltage for stable voltage holding capability was found to be less than 320-340 kV where the light was sufficiently suppressed. By tuning the extraction voltage, the grid power loadings in the ion sources were decreased to the allowable levels for long pulse injection without a significant reduction of the beam power. After tuning the acceleration and extraction voltages, D{sup -} ion beams of 12.5 and 9.8 A were produced at 340 keV with cesium seeding at a rate of {approx}14 {mu}g/s into the ion sources. The pulse duration of these D{sup -} ion beams was extended step by step, and then was successfully extended up to 18 s without degradation of the negative ion production. The D{sup -} ion beams were neutralized to yield 3.6 MW D{sup 0} beams by a gas cell, and then injected into the JT-60 U plasma. Further, a slight reduction of D{sup -} ion beam power allowed the longer injection duration of 21 s at a D{sup 0} beam power of 3.2 MW. The success in the long pulse production of a high power D{sup -} ion beam shows that negative ion beams can be produced during a few tens of seconds without degradations of negative ion production and the voltage holding in a large Cs-seeded negative ion source.

Hanada, M.; Kamada, M.; Akino, N.; Ebisawa, N.; Honda, A.; Kawai, M.; Kazawa, M.; Kikuchi, K.; Komata, M.; Mogaki, K.; Noto, K.; Ohshima, K.; Takenouchi, T.; Tanai, Y.; Usui, K.; Yamazaki, H.; Ikeda, Y.; Grisham, L. R. [Japan Atomic Energy Agency, 801-1 Mukohyama-Naka, Ibaraki 310-0193 (Japan); Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543 (United States)

2008-02-15

154

Present status of the negative ion based NBI system for long pulse operation on JT-60U  

NASA Astrophysics Data System (ADS)

The 500 keV negative-ion based neutral beam injector for JT-60U started operations in 1996. The availability of the negative ion based neutral beam injection system has been improved gradually by modifying the ion source and optimizing its operation parameters. Recently, the extension of the pulse duration up to 30 s has been intended to study quasi-steady state plasma on JT-60U. The most serious issue is to reduce the heat load on the grids for long pulse operation. Two modifications have been proposed to reduce the heat load. One is to suppress the spread of beamlet-bundle which may be caused by beamlet-beamlet interaction in the multi-aperture grid due to the space charge force. Indeed, the investigation of the beam deflection, which was measured by the infrared camera on the target plate set 3.5 m away from the grid, indicates that the spread of beamlet-bundle is in proportion to the current density. Field-shaping plates were attached on the extraction grid to modify the local electric field. The plate thickness was optimized to steer the beamlet deflection. The other is to reduce the stripping loss, where the electron of the negative ion beam is stripped and accelerated in the accelerator and then collides with the grids. The ion source was modified to reduce the pressure in the accelerator column to suppress the beam-ion stripping loss. To date, long pulse injection of 19 s of 1.5-1.6 MW at a high energy beam of 360 keV, 9-10 A for D- has been obtained by one ion source with these modifications.

Ikeda, Y.; Umeda, N.; Akino, N.; Ebisawa, N.; Grisham, L.; Hanada, M.; Honda, A.; Inoue, T.; Kawai, M.; Kazawa, M.; Kikuchi, K.; Komata, M.; Mogaki, K.; Noto, K.; Okano, F.; Ohga, T.; Oshima, K.; Takenouchi, T.; Tanai, Y.; Usui, K.; Yamazaki, H.; Yamamoto, T.

2006-06-01

155

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

NASA Astrophysics Data System (ADS)

The JT-60U negative ion source has been designed to produce high current beams of 22A 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 5.2mrad outward for beamlets more than ten.

Kamada, M.; Hanada, M.; Ikeda, Y.; Grisham, L. R.; Jiang, W.

2008-02-01

156

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

157

Some comparisons of the flyover noise characteristics of DC-9 aircraft having refanned and hardwalled JT8D engines, with special reference to measurement and analysis procedures  

NASA Technical Reports Server (NTRS)

Flyover noise measurements were made (using Federal Aviation Regulations, part 36 procedures) of two DC-9 aircraft, one equipped with refanned JT8D-109 engines and the other equipped with hardwalled JT8D-9 engines. NASA analyses show a refan centerline noise reduction of about 9.1 EPNdB and 10.0 EPNdB for takeoff with cutback and 50 deg. flap landing approach, respectively. A comparison of refan and hardwall PNLTM spectra shows that the refan noise reduction may be attributed to lower jet noise levels on takeoff and reduced high-frequency tonal content on landing approach. A general description of the test procedures and results are included along with detailed descriptions of the measurement and analysis systems.

Hosier, R. N.

1976-01-01

158

Extension of integrated high performance regimes with impurity and deuterium particle control in Japan Atomic Energy Research Institute Tokamak60 Upgrade (JT-60U)  

Microsoft Academic Search

In JT-60U [Horiike et al., Fusion Eng. Des. 16, 285 (1991)] extension of high performance plasmas toward high density, high radiation-loss-power fraction and high fuel purity has been explored by pellet injection, Ar injection and study of impurity production. By pellet injection from the high-field-side, the density range for the high-poloidal-beta high-confinement mode plasmas with edge localized modes (high-betap ELMy

H. Kubo

2002-01-01

159

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

NASA Astrophysics Data System (ADS)

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

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

2015-03-01

160

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

NASA Astrophysics Data System (ADS)

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 to follow the time evolution of the discharge from the preheating phase without an ITB through the ITB onset phase until the high performance phase with fair accuracy in most cases in JET and JT-60U. This indicates the importance of the interplay between the magnetic shear and ?E×B flow shear in ITB formation since these are the mechanisms that govern the ITB physics in the model. In order to achieve good agreement in DIII-D, the ?-stabilization had to be included in the model, emphasizing the role played by the ?-stabilization in the physics of the ITBs. The Weiland and GLF23 transport models show limited agreement between the model predictions and experimental time evolution of the ITB and kinetic plasma profiles. The Weiland model does not form a clear ITB in any of the three tokamaks despite varying plasma profiles, such as the q-profile. On the other hand, the average temperatures and density are often in fair agreement with experimental values. The GLF23 model often predicts an ITB, but its radial location is often too far inside the plasma, or shrinks as the simulations proceed in time. Consequently, the central temperatures at the end of the simulations during the high performance phase are usually underestimated. It is worth noting that GLF23 features in general better predictions of the Te and Ti profiles outside the ITB than the other models studied. Achieving the quantitative capability to predict the multi-channel ITB dynamics with fully predictive, time-dependent transport simulations has turned out to be extremely challenging.

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

2006-05-01

161

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

NASA Technical Reports Server (NTRS)

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

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

1977-01-01

162

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

NASA Astrophysics Data System (ADS)

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

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

2014-04-01

163

Hydrogen retention and carbon deposition in plasma facing components and the shadowed area of JT-60U  

NASA Astrophysics Data System (ADS)

In JT-60U, erosion/deposition analyses of the plasma facing wall have shown that local carbon transport in the inboard direction was appreciable in addition to long-range transport. The total deposition and erosion rates in the divertor region were ~1 × 1021 C atoms s-1 and ~-6 × 1020 C atoms s-1, respectively. About 40% of the deposition in the divertor region likely originates from the main chamber wall. At the plasma facing surfaces of the divertor region, the highest hydrogen concentration in the (H + D)/C ratio and the retention amount were found to be ~0.13 and ~1 × 1023 atoms m-2, respectively. In the plasma-shadowed area underneath the divertor region with a vacuum vessel baking temperature of 420 K, redeposited layers of ~2 µm thickness were found with a high hydrogen concentration of ~0.75 in (H + D)/C, which was nearly the same level as that observed in JET. Large deuterium retention was also observed at the main chamber wall covered with boron layers. Their H + D retention and (H + D)/C were ~1 × 1023 atoms m-2 and ~0.16, respectively, for the vacuum vessel temperature of 570 K. Such a high deuterium retention is most likely caused by D retained in the boron layers. Nevertheless, the integration of this retention over the whole main chamber wall results in significant inventory and needs further investigation.

Masaki, K.; Tanabe, T.; Hirohata, Y.; Oya, Y.; Shibahara, T.; Hayashi, T.; Sugiyama, K.; Arai, T.; Okuno, K.; Miya, N.

2007-11-01

164

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

SciTech Connect

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

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

2013-09-15

165

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

NASA Astrophysics Data System (ADS)

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

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

2014-10-01

166

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

NASA Technical Reports Server (NTRS)

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

1975-01-01

167

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

SciTech Connect

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

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

1997-02-01

168

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

NASA Astrophysics Data System (ADS)

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

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

2014-01-01

169

Identification of static JT in copper(II) doped hexaimidazole M(II) lattices: M=Co and Ni: an EPR study.  

PubMed

Single crystal EPR studies on Cu(II) doped paramagnetic host lattices, hexaimidazole M(II) dichloride tetrahydrate (M=Co and Ni), isomorphous with M=Zn, have been carried out from room temperature to 77K to understand the nature of Jahn-Teller (JT) distortion in these paramagnetic host systems. The paramagnetic impurity, doped in the present two paramagnetic host lattices, shows anisotropic EPR spectra with superhyperfine from ligands, even at room temperature. An interesting observation noticed in the EPR spectra at room temperature is that there are more resonances corresponding to the second site in the paramagnetic hosts than in the diamagnetic host at 4.2K. This difference in behavior between the diamagnetic and paramagnetic host lattices indicates a change in the depth of the JT valleys. The spin Hamiltonian parameters are evaluated for Cu(II) ion in both the host lattices and the relaxation times have been calculated for the ion in cobalt host lattice only. PMID:16257752

Velavan, K; Venkatesan, R; Sambasiva Rao, P

2005-11-01

170

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

SciTech Connect

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

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

2014-01-29

171

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

PubMed

Non-uniformity of the negative ion beams in the JT-60 negative ion source with the world-largest ion extraction area was improved by modifying the magnetic filter in the source from the plasma grid (PG) filter to a tent-shaped filter. The magnetic design via electron trajectory calculation showed that the tent-shaped filter was expected to suppress the localization of the primary electrons emitted from the filaments and created uniform plasma with positive ions and atoms of the parent particles for the negative ions. By modifying the magnetic filter to the tent-shaped filter, the uniformity defined as the deviation from the averaged beam intensity was reduced from 14% of the PG filter to ?10% without a reduction of the negative ion production. PMID:24593591

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

2014-02-01

172

Production and accumulation of 4-O-methyl-?-D-glucuronosyl-xylotriose by growing culture of thermophilic Anoxybacillus sp. strain JT-12.  

PubMed

A thermophilic Anoxybacillus sp. strain JT-12, isolated from soil, produced acidic xylotriose, 4-O-methyl-?-D-glucuronosyl-xylotriose (MeGlcAX?), as a main product from birchwood xylan and accumulated them in the culture under optimum conditions at pH 7.0 and 55 °C using 0.75% (w/v) birchwood xylan as a carbon source for 42-72 h. The acidic xylotriose was purified by ethanol precipitation and high-performance liquid chromatography using NH? Lichosher® 100 column. The results of electrospray ionization mass spectrometry, mass to charge ratio (m/z) 603.23, confirmed that the purified sample was acidic xylotriose that had benefits and applications in many fields. PMID:22350872

Thitikorn-amorn, Jitladda; Kyu, Khin Lay; Sakka, Kazuo; Ratanakhanokchai, Khanok

2012-04-01

173

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

NASA Astrophysics Data System (ADS)

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

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

2014-02-01

174

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

NASA Technical Reports Server (NTRS)

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

1973-01-01

175

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

176

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

SciTech Connect

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

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

2008-09-15

177

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

NASA Technical Reports Server (NTRS)

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

Strout, F. G.

1976-01-01

178

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

NASA Technical Reports Server (NTRS)

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

Strout, F. G.

1978-01-01

179

Operation and Development of the 500-keV Negative-Ion-Based Neutral Beam Injection System for JT-60U  

SciTech Connect

The 500-keV negative-ion based neutral beam injector for JT-60U started operation in 1996. The beam power has been increased gradually through optimizing operation parameters of the ion sources and conquering many troubles in the ion source and power supplies caused by a high voltage break-down in the accelerator. However, some issues remain to be solved concerning the ion source for increasing further the beam power and the beam energy. The most serious issue of them is non-uniformity of source plasma in the arc chamber. Various countermeasures have been implemented to improve the non-uniformity. Some of those countermeasures have been found to be partially effective in reducing the non-uniformity of the source plasma, and as the result the ion source, so far, has accelerated negative-ion beams of 17.4A at 403keV with deuterium and 20A at 360keV with hydrogen against the goal of 22A at 500keV. The neutral beam injection power into the plasma has reached 5.8MW at 400keV with deuterium. Further efforts to reach the target of 10MW at 500keV have been continued.

Kuriyama, M.; Akino, N.; Ebisawa, N.; Grisham, L.; Honda, A.; Itoh, T.; Kawai, M.; Kazawa, M.; Mogaki, K.; Ohara, Y.; Ohga, T.; Okumura, Y.; Oohara, H.; Umeda, N.; Usui, K.; Watanabe, K.; Yamamoto, M.; Yamamoto, T. [Japan Atomic Energy Research Institute (Japan)

2002-09-15

180

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

NASA Technical Reports Server (NTRS)

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

1975-01-01

181

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

SciTech Connect

For solving a window coating problem, an {ital in situ} window transmission monitoring by inferring it precisely from a known attenuation of the deposited film has been developed in the JT-60U Thomson scattering system. Also the practicability of an {ital in situ} window cleaning based on a laser blow-off technique has been investigated extensively. The coated film composition could be guessed to be a resin such as {ital polyacrylonitrile} with a small amount of metals. The existence of chromatic upper limit has been found in the recovered transmission after the blow-off cleaning, which gives systematic errors only of less than 3% to an apparent measurement of both electron density and temperature at 10 keV or less. The attenuation itself is unchanged before and after the laser blow-off cleaning. A complementary use of both methods will provide the Thomson scattering measurement of high T{sub e} plasmas with durable reliability and sufficient precision in the existing tokamaks and the International Thermonuclear Experimental Reactor. {copyright} {ital 1997 American Institute of Physics.}

Yoshida, H.; Naito, O.; Hatae, T.; Nagashima, A. [Japan Atomic Energy Research Institute, Naka-machi, Ibaraki 311-01 (Japan)] [Japan Atomic Energy Research Institute, Naka-machi, Ibaraki 311-01 (Japan)

1997-01-01

182

Fast reciprocating probe system for local scrape-off layer measurements in front of the lower hybrid launcher on JT-60U  

SciTech Connect

A fast reciprocating probe system with a long drive shaft was incorporated into a multi-junction lower hybrid (LH) wave launcher on JT-60U in order to investigate an improved coupling mechanism of the radio frequency wave to the core plasma. The system has been operated reliably over a horizontal scan of 25 cm in 1.5 s using a compact pneumatic cylinder drive and springs. A double probe measurement provided the scrape-off layer plasma profile between the last closed flux surface and the first wall with the spatial resolution of 1{minus}2 mm measured with a laser displacement gauge. The profiles of the electron density {ital n}{sub {ital e}} and temperature {ital T}{sub {ital e}} were in good agreement with those obtained with a triple probe method. During the LH wave injection with good coupling to the core plasma, an increase in the local {ital T}{sub {ital e}} was observed in front of the LH launcher mouth. The local {ital n}{sub {ital e}} was (7{minus}10){times}10{sup 16} m{sup {minus}3}, consistent values needed for the good coupling. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.

Asakura, N.; Tsuji-Iio, S.; Ikeda, Y.; Neyatani, Y.; Seki, M. [Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, Mukoyama, Naka-machi, Naka-gun, Ibaraki, Japan 311-01 (Japan)] [Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, Mukoyama, Naka-machi, Naka-gun, Ibaraki, Japan 311-01 (Japan)

1995-12-01

183

Thermo-Hydraulic Analyses Associated with the Design of JT-60SA TF Coils Development and Validation of the Tacos/texto Tool  

NASA Astrophysics Data System (ADS)

In the framework of the JT-60SA project, TF coils design activities have led to the development of TEXTO (Thermo-hydraulic EXtended TOol), a dedicated simulation tool centred on the GANDALF code for calculating the temperature margin (?Tma) central criterion. From a first version providing conservative results, this tool has been upgraded to a pseudo 3D model by integrating a 1D thermo-hydraulic approach in ANSYS, leading to an additional and independent module named TACOS (Thermo-hydraulic Ansys COmputation Semi 3D). By providing He temperature in conductors, TACOS is well adapted for evaluating the impact of TF coils design choices in the framework of cost and feasibility optimization. TACOS also provides more accurate values of transverse heat flux from case to conductors, which can then be injected into TEXTO and allow the calculation of the temperature margin, thanks to the functionalities of GANDALF. Several validation calculations have been performed for the reference operation scenario, by comparison with GANDALF for validating the simplified thermo-hydraulic method of TACOS and by comparison with VINCENTA for an overall validation of the TACOS/TEXTO tool. Results have shown a good consistency between the different models, with a conductor temperature dispersion around 0.05 K in the critical zone.

Lacroix, B.; Portafaix, C.; Hertout, P.; Nicollet, S.; Zani, L.; Barabaschi, P.; Villari, R.

2010-04-01

184

Achievement of high fusion triple product, steady-state sustainment and real-time NTM stabilization in high-betap ELMy H-mode discharges in JT-60U  

Microsoft Academic Search

This paper reports results on the progress in steady-state high-bgrp ELMy H-mode discharges in JT-60U. A fusion triple product, nD(0)tgrETi(0), of 3.1 × 1020 m-3 s keV under full non-inductive current drive has been achieved at Ip = 1.8 MA, which extends the record value of the fusion triple product under full non-inductive current drive by 50%. A high-beta plasma

A. Isayama; Y. Kamada; N. Hayashi; T. Suzuki; T. Oikawa; T. Fujita; T. Fukuda; S. Ide; H. Takenaga; K. Ushigusa; T. Ozeki; Y. Ikeda; N. Umeda; H. Yamada; M. Isobe; Y. Narushima; K. Ikeda; S. Sakakibara; K. Yamazaki; K. Nagasaki

2003-01-01

185

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

E-print Network

- and salinity-stratified systems. Using static mass-balance calculations as well as dynamic well flow simuPlease cite this article in press as: Birkholzer, J.T., et al., Brine flow up a well caused. Greenhouse Gas Control (2011), doi:10.1016/j.ijggc.2011.01.003 ARTICLE IN PRESSG Model IJGGC-386; No.of Pages

Zhou, Quanlin

186

Recent RF Experiments and Application of RF Waves to Real-Time Control of Safety Factor Profile in JT-60U  

SciTech Connect

Two topics of applications of RF waves to current profile control in JT-60U are presented; application of lower-hybrid (LH) waves to safety factor profile control and electron cyclotron (EC) waves to neo-classical tearing mode (NTM) control. A real-time control system of safety factor (q) profile was developed. This system, for the first time, enables 1) real time evaluation of q profile using local magnetic pitch angle measurement by motional Stark effect (MSE) diagnostic and 2) control of current drive (CD) location ({rho}CD) by controlling the parallel refractive index N parallel of LH waves through control of phase difference ({delta}{phi}) of LH waves between multi-junction launcher modules. The method for real-time q profile evaluation was newly developed, without time-consuming reconstruction of equilibrium, so that the method requires less computational time. Safety factor profile by the real-time calculation agrees well with that by equilibrium reconstruction with MSE. The control system controls {rho}CD through {delta}{phi} in such a way to decrease the largest residual between the real-time evaluated q profile q(r) and its reference profile qref(r). The real-time control system was applied to a positive shear plasma (q(0){approx}1). The reference q profile was set to monotonic positive shear profile having qref(0)=1.3. The real-time q profile approached to the qref(r) during application of real-time control, and was sustained for 3s, which was limited by the duration of the injected LH power. Temporal evolution of current profile was consistent with relaxation of inductive electric field induced by theoretical LH driven current. An m/n=3/2 NTM that appeared at {beta}N{approx}3 was completely stabilized by ECCD applied to a fully-developed NTM. Precise ECCD at NTM island was essential for the stabilization. ECCD that was applied to resonant rational surface (q=3/2) before an NTM onset suppressed appearance of NTM. In order to keep NTM intensity below a level, ECCD before the mode onset was more effective than that after mode saturation.

Suzuki, T.; Isayama, A.; Ide, S.; Fujita, T.; Oikawa, T.; Sakata, S.; Sueoka, M.; Hosoyama, H.; Seki, M. [Japan Atomic Energy Research Institute, Naka Fusion Research Establishment (Japan)

2005-09-26

187

Doppler shifts in the KATRIN experiment  

E-print Network

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

Heine, Matthew K

2008-01-01

188

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

NASA Technical Reports Server (NTRS)

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

Kupcis, E. A.

1974-01-01

189

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

NASA Technical Reports Server (NTRS)

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

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

1973-01-01

190

JT90 thermal barrier coated vanes  

NASA Technical Reports Server (NTRS)

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

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

1982-01-01

191

JT/LJT connector insert material evaluation  

SciTech Connect

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

Baca, J.R.F.

1991-10-01

192

J.T. Roberts' Science Fair  

NSDL National Science Digital Library

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

Ms. Greeley

2007-11-03

193

Menu Structuring for Mobile Devices Katrin Sauerwein1  

E-print Network

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

194

Gruppe 1 12:45 13:30 Franz Katrin  

E-print Network

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

Keller, Gerhard

195

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

E-print Network

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

Standiford, Richard B.

196

The Assessment Continuum James (J.T.) Laverty  

E-print Network

in education? Must be integrated into the educational experience! · supporting the goals - not technology students read materials · Questions can be answered just based on the readings · Students come prepared #12 on voting outcome § Explain again § Go on § Let students discuss and vote again #12;Clicker Peer

197

Sorption J-T refrigeration utilizing manganese nitride chemisorption  

NASA Technical Reports Server (NTRS)

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

Jones, Jack; Lund, Alan

1990-01-01

198

J. theor. Biol. (1998) 193, 631648 Article No. jt980730  

E-print Network

the advantage? Kin selection was the first mechanism proposed (Hamilton, 1963, 1964): a gene promoting altruism happen if the individuals are related. [Incidentically, the term ``kin selection'' was coined by Maynard

van Baalen, Minus

1998-01-01

199

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

E-print Network

and types of development. Current population stands at approximately 55,000 permanent residents. A highly century the economy has been geared primarily toward recreation and tourism. During the period of rapid. An aggressive public land acquisition program, combined with strict constraints on development, has made those

Standiford, Richard B.

200

72562756 -1 -AES/jt2 July 23, 2013  

E-print Network

of Expenses Attachment C - Flow Chart of the RPS Procurement Process Attachment D - Detailed Illustration ..................................................................................................12 5.1.3. Process for Commission Determination of PEL...................................12 5

201

J. theor. Biol. (1998) 195, 419438 Article No. jt970620  

E-print Network

in the history of biology are Darwin's On the Origin of Species (1964) and Hebb's The Organisation of Behavior of adaptation is universal: when complexity exceeds some level, self-organisation can no longer be maintained

Adams, Paul R.

202

Copyright Notice Triton Burnup Study in JT-60U  

E-print Network

the toroidal ripple effect on the fast triton by analyzing the time history of the 14 MeV emission after NB the maximum recoil-proton range for a 14 MeV neutron is 2.2 mm in plastic scintillator, we chose to use either in the range of energy 5 eV-14 MeV. 3. Time Dependent Analysis We measured and analyzed the time histories

203

Clean-up of graphite first walls in JT-60  

NASA Astrophysics Data System (ADS)

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

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

1989-04-01

204

Miniature J-T refrigators using adsorption compressors  

NASA Technical Reports Server (NTRS)

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

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

1982-01-01

205

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

E-print Network

329 RELG/IDEN/CLTR PLRL RELIG 350 BUDDHISM & SOCIETY ANTH 352 JSIS B 356 BUDDHISM & SOCIETY RELIG 352 HINDUISM JSIS B 352 HINDUISM RELIG 354 BUDDHISM JSIS B 354 BUDDHISM RELIG 380 RELIG,NATURE&STUDY CHID 380

Hochberg, Michael

206

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

PubMed Central

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

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

2012-01-01

207

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

E-print Network

to some stunning realizations about Saint Augustine?s in#12;uence upon John Donne. Of the Church Fathers that Donne cited, Augustine eclipsed all others by a signi#15;cant margin. reviews 13 Given this clear distinction between Augustine...?on the meaning of death, happiness, and the ecstatic possibility of a metaphysical union with the godhead?a peace that eclipses all human understanding. One simply cannot say enough about what Ettenhuber has achieved in Donne?s Augustine. It is a clearly...

Harris, Mitchell M.

2012-01-01

208

UNSUPERVISED SUBMODULAR SUBSET SELECTION FOR SPEECH DATA :EXTENDED Kai Wei Yuzong Liu Katrin Kirchhoff Jeff Bilmes  

E-print Network

being computationally very efficient and requiring no labeling. Index Terms-- speech processing, automatic speech recognition, machine learning 1. INTRODUCTION Automatic speech recognition (ASR) systems has been collected (e.g., from a new language or dialect) but has not yet been transcribed

Noble, William Stafford

209

UNSUPERVISED SUBMODULAR SUBSET SELECTION FOR SPEECH DATA Kai Wei Yuzong Liu Katrin Kirchhoff Jeff Bilmes  

E-print Network

computationally very efficient and requiring no labeling. Index Terms-- speech processing, automatic speech recognition, machine learning 1. INTRODUCTION Automatic speech recognition (ASR) systems are nowadays trained (e.g., from a new language or dialect) but has not yet been transcribed. The available budget

Noble, William Stafford

210

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

E-print Network

of frame-semantic roles (Baker et al., 1998) on top of syntactic trees in the TIGER format (Mengel in the TIGER XML format (Mengel and Lezius, 2000). The list of frames that can be annotated is read directly

Padó, Sebastian

211

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

PubMed

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

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

2013-01-01

212

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

NASA Technical Reports Server (NTRS)

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

Stromberg, W. J.

1981-01-01

213

Particle balance under global wall saturation in long-pulse discharges of JT-60U  

NASA Astrophysics Data System (ADS)

During 30s-ELMy H-mode discharges, the wall-pumping rate decreases with a decay constant of several seconds and then becomes constant. During the constant wall-pumping phase, in discharges with a density of 65% of the Greenwald density, the wall-pumping rate is negative, in other words, outgassing. It has been found that this outgassing rate correlates with an increase in the tile temperature around the outer strike point. In discharges with a density of 80% of the Greenwald density, the wall-pumping rate is positive. Unless a high net deposition rate (>60%) of hydrocarbon is assumed, the positive wall-pumping rate cannot be explained only by the co-deposition of deuterium with carbon even if the outgassing rate is assumed to be zero. The vessel deuterium inventory decreases by 1.1 × 10 24 on one experimental day with 17 long discharges. The main chamber wall is suggested as the deuterium source for the decrease of the inventory.

Nakano, T.; Asakura, N.; Takenaga, H.; Kubo, H.; Shimizu, K.; Kawashima, H.; JT-60 Team

2007-06-01

214

e Science Jervioe Feature Released u--on receisJt  

E-print Network

season is now on i n Death Valley. Although t h i s California desert i s notorious the world over f o r: iiunch, neL- the eastern edge of t h e valley, where it i s L m t t Y certain the temperature does of Valley cnii do in the riaY of hectr nie averwe r a i n f a l l of the Valley, a l i t t l e over a1 inch

215

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

SciTech Connect

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

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

1986-08-15

216

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

SciTech Connect

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

Paugh, R.L.

1989-09-15

217

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

NASA Technical Reports Server (NTRS)

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

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

1996-01-01

218

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

E-print Network

N ·Working load 2.5kN ·Connection Stiffness 2.5 kN/mm Characterization of Connection Method #12;Importance composite beam in bending: From inspection Moment equilibrium equation e dD DEA dD EI FdD dDEA DEA dDEA EI M w f f w f 8 2 8 2 22 #12;Consider an element of flange section

Mottram, Toby

219

Extensible JT Open Tool for prototypical process support, based on OpenSceneGraph and QT  

Microsoft Academic Search

In today's globalized markets, effectivity in the way that product development information is communicated and transparently interpreted by a diversity of divisions and disciplines in an enterprise has an essential impact on the key factors time, cost and quality. Against the background of current activities in the automotive industry, we have conducted a process chain analysis at multiple OEMs and

Martin Eigner; Florian Gerhardt

2009-01-01

220

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

E-print Network

Microseismic mapping of a Cotton Valley hydraulic fracture using decimated downhole arrays J three hydraulic fracture operations in the Cotton Valley gas field of East Texas. Two 48-level, 3 a consortia of operators and service companies conducted an extensive hydraulic fracture imaging demonstration

221

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

Microsoft Academic Search

Fully non-inductive discharge having a relaxed current profile and a high bootstrap current fraction fBS = 0.5 has been realized in the high-betap 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

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

2009-01-01

222

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

E-print Network

2 nm / mm ! / "! # 150 Detector : MCP 50 µm x 1024ch Calibration : SR & Branching Ratio #12;2 1 0 (A CIII2p 1 P1 -3d 1 D2 :574.28 CIII2p 3 P0,1,2 -3d 3 D1,2,3 HeII303.78 L# OVx2 CIVx3 CIII2p-4d:371.7 VUV

Princeton Plasma Physics Laboratory

223

69 FR 58099 - Airworthiness Directives; Pratt & Whitney JT8D-200 Series Turbofan Engines  

Federal Register 2010, 2011, 2012, 2013, 2014

...temperature indicator window has turned black, perform troubleshooting, diagnostic...remaining temperature indicator has turned black, perform troubleshooting, diagnostic...remaining temperature indicator has not turned black, replace the missing temperature...

2004-09-29

224

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

225

Effect of steady flight loads on JT9D-7 performance deterioration  

NASA Technical Reports Server (NTRS)

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

Jay, A.; Todd, E. S.

1978-01-01

226

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

NASA Technical Reports Server (NTRS)

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

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

1978-01-01

227

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

NASA Technical Reports Server (NTRS)

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

1975-01-01

228

The Complexity of Rivers in Triangulated Terrains Pankaj Agarwal 1 Mark de Berg 2 Prosenjit Bose 3 Katrin Dobrint 2 Marc van Kreveld 2  

E-print Network

and time consuming job. Fortunately, through spatial analysis of digital representations of surfacesThe Complexity of Rivers in Triangulated Terrains Pankaj Agarwal 1 Mark de Berg 2 Prosenjit Bose 3 definitions of the flow of water on a terrain represented by n triangles, we show that the river network has

Bose, Prosenjit

229

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

E-print Network

Coils TF Coil Test JT-60SA Magnet Interface Facility JT-60U Disassembly Mar., 2013 Coils Assembly flame Vacuum Vessel Sectors #12;JT-60SA Torus Assembly Started Temporary installation) has never been achieved => the goal of JT-60SA. #12;JT-60SA is a flexible `Test Stand

230

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

NASA Technical Reports Server (NTRS)

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

1973-01-01

231

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

Federal Register 2010, 2011, 2012, 2013, 2014

...manual and an air carrier's approved continuous airworthiness maintenance program to...manual and an air carrier's approved continuous airworthiness maintenance program to...mandatory inspections section of the continuous airworthiness maintenance...

2011-02-15

232

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

Federal Register 2010, 2011, 2012, 2013, 2014

...manual and an air carrier's approved continuous airworthiness maintenance program to...manual and an air carrier's approved continuous airworthiness maintenance program...mandatory inspections section of the continuous airworthiness maintenance...

2010-08-18

233

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

Federal Register 2010, 2011, 2012, 2013, 2014

...and -219 Turbofan Engines AGENCY: Federal Aviation...and -219 turbofan engines with front compressor...initial and repetitive eddy current (ECI) and fluorescent...result in an uncontained engine failure and damage to...not have a substantial direct effect on the...

2010-03-18

234

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

E-print Network

,saxton]@cs.uregina.ca ABSTRACT Current intrusion detection techniques mainly focus on discovering abnormal system events to computer systems are growing. Intrusion detection systems are becoming increasingly important suspected intrusion, and then raise an alarm. A typical intrusion detection system consists of three

Yao, JingTao

235

Observation of the limiter H mode in the JT-60 tokamak with lower-hybrid current drive  

Microsoft Academic Search

The H mode was achieved in limiter discharges of a tokamak with lower-hybrid current drive for the first time. Simultaneous application of rf powers at two different frequencies such as 1.74 and 2.23 GHz or 1.74 and 2.0 GHz appeared to be effective in the attainment of the H mode. The threshold lower-hybrid power was as low as Ohmic-heating power

S. Tsuji; K. Ushigusa; Y. Ikeda; T. Imai; T. Itami; M. Nemoto; K. Nagashima; Y. Koide; Y. Kawano; T. Fukuda; T. Kondoh; M. Shimada; H. Nakamura; O. Naito; H. Yoshida; T. Nishitani; H. Kubo; K. Tobita; Y. Kusama; S. Ishida; M. Sato; N. Isei; T. Sugie; N. Miya; R. Yoshino; K. Uehara

1990-01-01

236

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

E-print Network

t +Fv m( ) = j � B - p Momentum eq. of single fluid m : B = � + g Faraday's law for g & time-evolution B t = - � E Ohm's law : ITB & ETB Model ITB & ETB-generated BS Current jbs · B = L31 A1 e + Zi -1 Ti

237

~n"'llIll"'mlln!: & B"hill'jt>r IYM, 12 01, 2'i2-2'J()  

E-print Network

of suhject genotype, suh- This research was supported hy Natural Sciences and Engineering Rcsearch Council for lechnical assistance. D. J. Kennett is now at Trent University, and S W. Wigmore is at the University

Galef Jr., Bennett G.

238

Analysis of radiation patterns of interaction tones generated by inlet rods in the JT15D engine  

NASA Technical Reports Server (NTRS)

Interaction tones were intentionally generated by circumferential arrays of equally spaced rods that protrude radially from the inlet wall near the face of the 28-blade fan. Arrays of 28 and 41 rods, selected to give specific far field radiation properties, were tested. The expected properties were readily apparent in the measured radiation patterns. A more detailed analysis of the test data showed both the precision and limitations of the applied acoustic theory. Rods protruding 23 percent of the radius predominantly generated only lowest radial order modes, as expected. Measured and predicted radiation patterns were generally in good agreement. The agreement, however, depended on a significant degree of implied refraction due to inlet velocity gradients. Refraction, if present, would impact static-flight noise comparisons.

Heidmann, M. F.; Saule, A. V.

1979-01-01

239

~ ~tm nf tQt ilnuutaht.aJuhlislJt11 bu wlrr 1Juninr Qrlall6  

E-print Network

breech-loading ritles. Two 'ubmcrged torpedo tubes. Twelve 3-inch ( q pounder) rapid-fire guns of 5001\\ CH, President____________Boise 1905- 1909· GEO. C. PARKINSON, Vice President___Preston 1905.\\Cll. GEO. C. P.\\RKI:.:SO~. ~las. \\\\'. TJ. RIDE~B.\\CGH. 12 #12;IDqt llfatulty If ever a young and growing

O'Laughlin, Jay

240

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

NASA Technical Reports Server (NTRS)

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

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

1979-01-01

241

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

Federal Register 2010, 2011, 2012, 2013, 2014

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

2011-03-24

242

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

Federal Register 2010, 2011, 2012, 2013, 2014

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

2010-07-01

243

Relation between the Oxygen Contents in the Neutral Beam and in the Core Plasma in JT-60U  

NASA Astrophysics Data System (ADS)

The D? spectral lines emitted from the neutral beam colliding with residual D2 in a beam chamber were observed. The Doppler shifts of these D? spectral lines indicate that the neutral beam includes deuterium atoms with energies of E, E/2, E/3 and E/9 ˜ E/11 (E : beamaccelerationenergy), which originate from D+, D+2, D+3 and DiO+ (i=1,2,3), respectively. From the intensity ratio of the D? spectral lines, the fraction of oxygen atoms to deuterium atoms was determined by the analysis on atomic and molecular processes in the neutralizer for the neutral beam. The neutral beam has been found to contain more than 8% of oxygen atoms over deuterium when the neutral beam injection starts. About 50% of the oxygen ions in the core plasma originate from the neutral beam. The oxygen content in the neutral beam decreases gradulally with its injection, and it reaches ˜ 1% around 850 injections. At this time, the fraction of the oxygen ions in the core plasma originating from the neutral beam is less than 20%. In L-mode plasmas, the confinement time of the oxygen ions originating from the neutral beam is estimated to be 0.5 s, and is longer than that of the deuterium ions ( 0.3 s ).

Nakano, Tomohide; Koide, Yoshihiko; Honda, Atsushi; Umeda, Naotaka; Akino, Noboru; Higashijima, Satoru; Takenaga, Hidenobu; Kubo, Hirotaka

244

Complex numbers Quaternions  

E-print Network

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

245

Fabrication and Test of Ferromagnetic Single-Electron-Transistors  

E-print Network

Fabrication and Test of Ferromagnetic Single-Electron-Transistors Diploma Thesis Katrin Pappert of Nanostructure Physics Diplomarbeit Fabrication and Test of Ferromagnetic Single-Electron-Transistors von Katrin studies of nanostructured devices are carried out. The devices are fabricated using e-beam lithography

Haviland, David

246

Public Relations Press Release  

E-print Network

Stephan Zipfel, specialist in psychosomatics in the Psychology Department. Along with Dr. Katrin Giel against obese people," says Dr. Katrin Giel, who led the project. The HR professionals were shown six are clear," says Giel. "In both cas- es, those who were overweight did badly. They were hardly ever entrust

Tübingen, Universität

247

haematocrits were measured on a CBC analyser (H System, Bayer Corporation). Reticulocytes were counted after staining with New Methylene Blue, Brecher Formula (JT  

E-print Network

. B., Greaves, D. R. & Kollias, G. Position-independent, high-level expression of the human beta Dev. 13, 2465±2477 (1999). 14. Higgs, D. R. Do LCRs open chromatin domains? Cell 95, 299±302 (1998 parameters differed between different treatment groups. Fisher's exact test was used to determine whether two

Woodgett, Jim

248

J. theor. Biol. (1997) 189, 1125 00225193/97/210011 + 15 $25.00/0/jt970488 7 1997 Academic Press Limited  

E-print Network

of the behavioral repertoire of Norway rats (Rattus norvegicus). Huddling behavior maintains the cohesion of litters throughout early life, and in adulthood, it remains a consistent feature of social behavior of R. norvegicus

249

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

Federal Register 2010, 2011, 2012, 2013, 2014

...manual and an air carrier's approved continuous airworthiness maintenance program to...manual and an air carrier's approved continuous airworthiness maintenance program...mandatory inspections section of the continuous airworthiness maintenance...

2010-08-18

250

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

Federal Register 2010, 2011, 2012, 2013, 2014

...manual and an air carrier's approved continuous airworthiness maintenance program to...manual and an air carrier's approved continuous airworthiness maintenance program to...mandatory inspections section of the continuous airworthiness maintenance...

2011-01-28

251

J. theor. Biol. (1997) 188, 507514 00225193/97/200507 + 08 $25.00/0/jt970484 7 1997 Academic Press Limited  

E-print Network

Press Limited Non-independence in Statistical Tests for Discrete Cross-species Data ALAN GRAFEN. Cross-species data is well known to suffer from non-independence because of its phylogenetic struc- ture

Grafen, Alan

252

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

E-print Network

are found in butterflies, but mimicry is also known to occur in birds, fish, reptiles, amphibians, mammals, moths, beetles, bugs, flies and snails (Owen, 1980; Pough, 1988) and fungi (Roy, 1993). In Batesian framework the system is described in terms of (sub)population sizes (e.g. #12;S. GAVRILETS AND A. HASTINGS

Gavrilets, Sergey

253

Real-time cylindrical curvilinear 3-D ultrasound imaging E.C. PUA, J.T. YEN AND S.W. SMITH  

E-print Network

ranging from 1 cm to less than 4 mm have been obtained. 3D color flow Doppler results have also been. For obstetric imaging or other applications where it is im- portant to visualize structures close to the skin

Smith, Stephen

254

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

E-print Network

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

Stephens, David W.

255

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

E-print Network

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

Boyer, Edmond

256

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

NASA Technical Reports Server (NTRS)

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

Hambly, D.

1974-01-01

257

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

E-print Network

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

Hauert, Christoph

258

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

E-print Network

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

259

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

PubMed

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

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

2014-10-01

260

TEM Characterization of Crept and Irradiated Nano-structured Ferritic Alloys J. Bentley,* D.T. Hoelzer,* J.T. Busby,* A.G. Certain,  

E-print Network

of Wisconsin, Madison, WI 53706 Dept. of Mech. & Nuclear Eng., Pennsylvania State University, University Park are insensitive to surface oxide films or modest surface contamination and for sufficiently thin regions (,4]. It was also previously shown that NC in 14YWT are not detectably changed by tensile testing at 25 and 700°C

Motta, Arthur T.

261

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

E-print Network

Design of an L-Band Microwave Radiometer with Active Mitigation of Interference Steven W. Ellingson countermeasures to mitigate RFI. In this paper, we describe a new radiometer which coherently samples 100 MHz frequency interference (RFI) impairs the opera- tion of L-band radiometers, particularly outside the pro

Ellingson, Steven W.

262

Study of turbofan engines designed for low energy consumption  

NASA Technical Reports Server (NTRS)

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

Gray, D. E.

1976-01-01

263

Organisational change and accounting information systems: a case study of the privatisation of Jordan Telecom  

Microsoft Academic Search

This thesis provides an attempt to better understand organisational change and its impact on accounting information systems in privatised enterprises using the particular case study of Jordan Telecom (JT), which became subject to the liberalisation of the telecommunication industry. JT would not survive in its public sector form and the privatisation of JT remains very controversial. This study aims to

Mohammed Shanikat

2008-01-01

264

Revue de presse hebdomadaire Semaine du 14 au 20 fvrier 2011  

E-print Network

POLITIK Kinderfreundliche Kasernen (von MARGARETE V. ACKEREN und KATRIN V. RANDENBORGH) : Eltern erstmals sollen Ausländer dienen dürfen. POLITIK Ferien mit »Air Dictature« (von FOCUS-Korrespondent Manfred Weber-Lamberdière) : Frankreichs politische Elite lässt sich ihren Urlaub von zwielichtigen

Rennes, Université de

265

Zrich, den 22. Dezember 2005 Bildungsdirektion  

E-print Network

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

Zürich, Universität

266

Probing the absolute mass scale of neutrinos  

E-print Network

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

Formaggio, Joseph A.

267

Quantitative Profiling Method for Oxylipin Metabolome by Liquid Chromatography  

E-print Network

Ionization Tandem Mass Spectrometry Jun Yang, Kara Schmelzer, Katrin Georgi, and Bruce D. Hammock* Department. Given that these lipid mediators are within the same cascade and are not independent of each other

Hammock, Bruce D.

268

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

E-print Network

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

269

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

E-print Network

together dissemination materials distributed by the Beach Center on a daily basis. My main role as JT’s job coach is to motivate JT to come to work on a daily basis and keep him busy learning new tasks and interacting with his co-workers. The Beach.... In this article, we describe JT’s life as it is today and review the lessons we have learned, hopeful that our successes and failures, and our process, will be useful to others. Who Is JT? JT is (if we may say so) a handsome 31-year old man. His love...

Turnbull, Ann P.; Turnbull, H. Rutherford

1999-01-01

270

Photoluminescence properties of Jahn-Teller transition-metal ions  

NASA Astrophysics Data System (ADS)

This work investigates the influence of electron-phonon coupling associated with E ?e and T ?e Jahn-Teller (JT) effect in different transition-metal (TM) ions on de-excitation phenomena through nonradiative multiphonon relaxation, i.e., photoluminescence (PL) quenching. We developed a configurational curve model which is able to predict from the absorption spectrum whether a given JT-TM ion is PL or quenched. The prediction is made on the basis of an adapted Dexter-Klick-Russell parameter for JT systems, defined in terms of spectroscopic parameters through ?JT=??eabs/Eabs, where ?eabs refers to the splitting of the parent octahedral Eg states by the JT distortion in E ?e (? =3/4) or T ?e (? =1/4), and Eabs is the energy of the first absorption band involving electronic transition between Eg and T2g. We show that PL in any JT-TM ion occurs whenever ?JT<0.1 or is quenched if ?JT>0.2. This result is noteworthy since it allows us to establish structural requirements for the JT-TM ion and the host crystal to be PL. Although PL properties of materials containing TM ions depend on a variety of structural factors such as the electronic configuration, the site symmetry, and the crystal field produced by neighboring atoms, the present model achieves this goal through a simple spectroscopic parameter: ?JT. In this work we correlated the PL properties of different sixfold-coordinated JT systems such as Ti3+, Cu2+, Mn3+, Cr2+, Fe2+, Co3+, and Ni3+ in halides and oxides with ?JT obtained from their respective absorption spectra. From this analysis we conclude that depending on the nature of the JT coupling and its strength, PL is either strongly favored or quenched in T ?e while it is mostly quenched in E ?e systems due to the larger JT distortion.

Sanz-Ortiz, Marta N.; Rodríguez, Fernando

2009-09-01

271

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

SciTech Connect

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

Ohmura, Shu; Kono, Hirohiko, E-mail: hirohiko-kono@m.tohoku.ac.jp [Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578 (Japan); Oyamada, Takayuki [Graduate School of Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama 236-0027 (Japan); Kato, Tsuyoshi; Nakai, Katsunori [Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan); Koseki, Shiro [Department of Chemistry, Graduate School of Science, Osaka Prefecture University, Osaka 599-8531 (Japan)

2014-09-21

272

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

E-print Network

Herbage Yield DONALD L.NEAL AND LEE R.NEAL ABSTRACT: A new electronic instru- ment, called the Heterodyne to measure the moisture of cereal grains, cotton bales, and soil. Probably the first applica- tion

Standiford, Richard B.

273

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

E-print Network

learning is enhanced by doing. Exam Preparation and Exam Writing Extreme Time Management LearningAcademic Advising & Career Centre: A team of professionals who advise, counsel and coach & Career Centre. All Rights Reserved. Study Skills Services The Academic Advising and Career Centre (AA

Boonstra, Rudy

274

Carmen Molina-Paris Department of Applied Mathematics, University of Leeds, Leeds LS2 9JT, UK Professor in Applied Mathematics since May 2010. email: carmen@maths.leeds.ac.uk  

E-print Network

. Chair of the British Society for Immunology Affinity Group Mathematical Modelling since August 2009, Warwick, UK, 2009. 8. Theoretical Immunology in a nutshell, Veterinary Laboratory Agencies National Conference, Warwick, UK, 2010. Recent invited seminars at UK institutions 1. May 2010, Department

Haase, Markus

275

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

E-print Network

to give something our undivided attention to the exclusion of other distractions. Most students report more frequent breaks, take a walk, take a nap, etc. Some days it will be tougher to concentrate than

Boonstra, Rudy

276

MPI Enhancements in John the Ripper  

Microsoft Academic Search

John the Ripper (JtR) is an open source software package commonly used by system administrators to enforce password policy. JtR is designed to attack (i.e., crack) passwords encrypted in a wide variety of commonly used formats. While parallel implementations of JtR exist, there are several limitations to them. This research reports on two distinct algorithms that enhance this password cracking

Edward R. Sykes; Michael Lin; Wesley Skoczen

2010-01-01

277

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

PubMed Central

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

2010-01-01

278

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

PubMed

Using the framework of multiconfiguration theory, where the wavefunction ?(t) of a many-electron system at time t is expanded as ?(t)=?(I)C(I)(t)?(I)(t) in terms of electron configurations {?(I)(t)}, we divided the total electronic energy E(t) as E(t)=?(I)|C(I)(t)|(2)E(I)(t) . Here E(I)(t) is the instantaneous phase changes of C(I)(t) regarded as a configurational energy associated with ?(I)(t). We then newly defined two types of time-dependent states: (i) a state at which the rates of population transfer among configurations are all zero; (ii) a state at which {E(I)(t)} associated with the quantum phases of C(I)(t) are all the same. We call the former time-dependent state a classical stationary state by analogy with the stationary (steady) states of classical reaction rate equations and the latter one a quantum stationary state. The conditions (i) and (ii) are satisfied simultaneously for the conventional stationary state in quantum mechanics. We numerically found for a LiH molecule interacting with a near-infrared (IR) field ?(t) that the condition (i) is satisfied whenever the average velocity of electrons is zero and the condition (ii) is satisfied whenever the average acceleration is zero. We also derived the chemical potentials ?(j)(t) for time-dependent natural orbitals ?(j)(t) of a many-electron system. The analysis of the electron dynamics of LiH indicated that the temporal change in ??(j)(t) ? ?(j)(t) + ?(t) · d(j)(t) - ?(j)(0) correlates with the motion of the dipole moment of ?(j)(t), d(j)(t). The values ??(j)(t) are much larger than the energy ?(j)(t) directly supplied to ?(j)(t) by the field, suggesting that valence electrons exchange energy with inner shell electrons. For H2 in an intense near-IR field, the ionization efficiency of ?(j)(t) is correlated with ??(j)(t). Comparing ??(j)(t) to ?(j)(t), we found that energy accepting orbitals of ??(j)(t) > ?(j)(t) indicate high ionization efficiency. The difference between ??(j)(t) and ?(j)(t) is significantly affected by electron-electron interactions in real time. PMID:25240343

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

2014-09-21

279

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

NASA Astrophysics Data System (ADS)

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

Moujaes, Elie A.; Abou Ghantous, Michel

2014-08-01

280

Local lattice effects in oxides  

Microsoft Academic Search

Neutron diffraction measurements were used to investigate the local atomic structure of manganese and cobalt oxides. Static Jahn-Teller (JT) distortions present in the lightly doped perovskite manganates were found in metallic compositions as well. The cooperativeness of the distortions is however lost as the doping is increased. In the two-layer manganates, the existence of a local JT effect helps explain

Despina Louca; George H. Kwei

1999-01-01

281

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

E-print Network

in JT-60U EX/1-5 (theory) Chu, MS United States of America Maintaining the Quasi-Steady State Central Project OV/1-2 Takenaga, H Japan Overview of JT-60U Results for Development of Steady-State Advanced and projection to ITER EX/1-2 Greenfield, CM United States of America Progress Toward High Performance Steady-State

282

High Pressure Research, Vol. 23, No. 12, March=June 2003, pp. 181186  

E-print Network

of water ligands enhances a JT release. Their associated axial ligand-field favours the occurrence. This change leads to the closing of the 2D JT distortion related to the four in-plane ClÃ? ligands, which complexes strongly influence the optical and magnetic properties of these materials, hence the establishment

Rodríguez, Fernando

283

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

284

Stability Properties of Toroidal Alfvn Modes Driven by Fast Particles  

E-print Network

, Princeton, NJ 08543 Y. Kusama, G. J. Kramer, K. Shinohara, T. Ozeki Japan Atomic Energy Research Institute] and Japan Atomic Energy Research Institute Toka- mak (JT-60U)[6] devices, and in stellarators Energy Research Institute Tokamak (JT- 60U) experiments some frequency chirping modes have very short

285

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

2013-05-01

286

Using family history information to promote healthy lifestyles and prevent diseases;a discussion of the evidence  

E-print Network

? J Epidemiol Community Health 2000, 54:859-863. 37. Bensen JT, Liese AD, Rushing JT, Province M, Folsom AR, Rich SS, Higgins M: Accuracy of proband reported family history: the NHLBI Family Heart Study (FHS). Genet Epidemiol 1999, 1:141-50. 38...

Claassen, Liesbeth; Henneman, Lidewij; Janssens, A Cecile J W; Wijdenes-Pijl, Miranda; Qureshi, Nadeem; Walter, Fiona M; Yoon, Paula W; Timmermans, Danielle R M

2010-05-13

287

Interplay between Coulomb and Jahn-Teller effects in icosahedral systems with triplet electronic states coupled to h-type vibrations  

NASA Astrophysics Data System (ADS)

We will consider the role played by electron-vibration and electron-electron interactions, through Jahn-Teller (JT) and Coulomb interactions, respectively, in icosahedral systems in which triplet electronic states are coupled to hg-type vibrations. Starting from the electronic terms that arise from consideration of Coulomb interactions, we introduce JT couplings both within the terms and between nondegenerate terms. We show how the symmetry of the JT distortion can change when extra electrons are added, and give the conditions under which JT distortions can be suppressed entirely when the Coulomb interactions are sufficiently large. The relevance of our results to anions of the fullerene molecule C60 are briefly discussed, and existing experimental measurements are used to estimate values for the quadratic JT coupling constants for these anions.

Alqannas, Haifa S.; Lakin, Andrew J.; Farrow, Joseph A.; Dunn, Janette L.

2013-10-01

288

Dynamical disorder of spin-induced Jahn-Teller orbitals with the insulator-metal transition in cobaltites.  

PubMed

Using elastic and inelastic neutron scattering, we investigated the evolution of the local atomic structure and lattice dynamics of La(1-x)SrxCoO3 (x=0-0.5) as it crosses over with x from an insulator to a ferromagnetic metal (FMM). Our pair density function analysis indicates that, in the paramagnetic insulating phase for all x, spin activation of Co3+ ions induces local static Jahn-Teller (JT) distortions. The size of the JT lattice increases almost linearly with x. However, in the FMM phase, static JT distortions are absent for x< or =30%. This coincides with narrowing of variant Planck's constant over 2 pi omega=22 and 24 meV modes in the phonon spectrum which we argue is due to localized dynamical JT fluctuations. For x>30%, static JT distortions reappear along with broadening of the phonon modes because of weakened charge-lattice interactions. PMID:14611473

Louca, Despina; Sarrao, J L

2003-10-10

289

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

EPA Science Inventory

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

290

DINMICA DE GASES RAREFEITOS E SUAS APLICAES Felix Sharipov  

E-print Network

. A aplicação da teoria a microdispositivos, ao experimento KATRIN e na aerotermodinâmica de veículos espaciais Navier-Stokes, as quais formam um conjunto de equações diferenciais parciais acopladas para o campo de

Sharipov, Felix

291

RESEARCH Open Access Sex difference in Double Iron ultra-triathlon  

E-print Network

RESEARCH Open Access Sex difference in Double Iron ultra-triathlon performance Katrin Sigg1 , Beat Background: The present study examined the sex difference in swimming (7.8 km), cycling (360 km), running (84 km), and overall race times for Double Iron ultra-triathletes. Methods: Sex differences in split

Boyer, Edmond

292

nature biotechnology volume 29 number 9 SePTember 2011 811 Systems biology aims to provide a mecha-  

E-print Network

is the area of genome-wide association studies (GWAS), where researchers take an unbiased survey of common of results for publication of GWAS papers, and in the best scenario, another research group replicates, Manuel C Peitsch3, J Jeremy Rice1, Ajay Royyuru1, Frank Schacherer12, Joerg Sprengel13, Katrin Stolle3

Lygeros, John

293

Gochronologie par mthodes ponctuelles  

E-print Network

minerals from the Jimperding Metamorphic Belt, Yilgarn Craton, Western Australia. Journal of Geology, 104 and titanite in the Archaean Katrine syenite, Southwestern Yilgarn Craton, Western Australia. Earth rocks. Chemical Geology 184: 151-165. [5] Bruguier O, Becq-Giraudon JF, Champenois M, Deloule E, Ludden

Demouchy, Sylvie

294

Conditions for detecting CP violation via neutrinoless double beta decay  

E-print Network

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

Alicja Joniec; Marek Zralek

2005-12-30

295

Multi-Stream Statistical N-Gram Modeling With Application To Automatic Language Identification  

E-print Network

Multi-Stream Statistical N-Gram Modeling With Application To Automatic Language Identification, USA katrin,sonia¡ @ee.washington.edu Abstract Most state-of-the art automatic language for multilingual speech processing systems. Automatic lan- guage identification (LID) is an integral part

Washington at Seattle, University of

296

National Environmental Research Institute Ministry of the Environment . Denmark  

E-print Network

Sørensen, Jytte Boll Illerup, Malene Nielsen, Erik Lyck, Henrik Gun- dorph Bruun, Morten Winther, Mette: Emission inventory, quality control, quality assurance, quality plan Layout: Ann-Katrine Holme 5 Critical Control Points (CCP) 17 6 Point of Measurements (PM) 19 7 Structure of reporting 22 8

297

Curriculum vitae -Heinz Koeppl General Information  

E-print Network

Curriculum vitae - Heinz Koeppl General Information Name Heinz K¨oppl Date of birth March 20, 1975 Place of birth Friesach, Austria Marital status Married to Katrin, daughters Jasmin (2005) and Iris an der Glan, Austria. 09/1981­07/1985 Primary school, Althofen, Austria. Research and Work Experience 09

Lygeros, John

298

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

E-print Network

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

Schlupp, Ingo

299

Identification of the Hammerhead Ribozyme Metal Ion Binding Site Responsible for Rescue of the Deleterious Effect of a Cleavage Site Phosphorothioate  

E-print Network

of the Deleterious Effect of a Cleavage Site Phosphorothioate Shenglong Wang,,§ Katrin Karbstein,,§ Alessio Peracchi referred to as the P9/G10.1 site. Although this metal ion binding site is 20 Å away from the cleavage site that the pro-RP oxygen at the cleavage site is coordinated by a metal ion in the reaction's transition state

Herschlag, Dan

300

Resonating valence-bond state in an orbitally degenerate quantum magnet with dynamical Jahn-Teller effect  

NASA Astrophysics Data System (ADS)

Short-range resonating valence-bond states in an orbitally degenerate magnet on a honeycomb lattice are studied. A quantum-dimer model is derived from the Hamiltonian which represents the superexchange interaction and the dynamical Jahn-Teller (JT) effect. We introduce two local units termed "spin-orbital singlet dimer," where two spins in a nearest-neighbor bond form a singlet state associated with an orbital polarization along the bond, and "local JT singlet," where an orbital polarization is quenched due to the dynamical JT effect. A derived quantum-dimer model consists of the hopping of the spin-orbital singlet dimers and the JT singlets, and the chemical potential of the JT singlets. We analyze the model by the mean-field approximation, and find that a characteristic phase, termed "JT liquid phase," where both the spin-orbital singlet dimers and the JT singlets move quantum mechanically, is realized. Possible scenarios for the recently observed non-magnetic-ordered state in Ba3CuSb2O9 are discussed.

Nasu, Joji; Ishihara, Sumio

2015-01-01

301

Mixed refrigerant Joule-Thomson sorption cryocoolers  

NASA Astrophysics Data System (ADS)

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

Tzabar, Nir; Grossman, Gershon

2014-01-01

302

Education for Engineers in Mitsubishi Heavy Industries  

NASA Astrophysics Data System (ADS)

In manufacturing companies, the importance of Off the Job Training (OffJT) is increasing, because there are not enough opportunities for On the Job Training (OJT) . Therefore, OffJT is required to further improve quality. Also it is required to enhance the skills of our engineers, as a substitute for OJT. Mitsubishi Heavy Industries has improved OffJT by using the same methods of quality improvement as those employed in our factories. It has also developed exercises to train engineers in complex multiple skills, thus improving their ability. We report the results of these efforts.

Ohsone, Masanori; Funakoshi, Makoto; Taguchi, Toshio

303

U.S. Department of the Interior U.S. Geological Survey  

E-print Network

, Jose C. Borrero, Deborah M. Brosnan, John T. Bwarie, Eric L. Geist, Laurie A. Johnson, Stephen H. Kirby., Wilson, Ri.I., Bahng, B., Barberopoulou, A., Borrero, J.C., Brosnan, D.M., Bwarie, J.T., Geist, E

304

72 FR 73766 - Notice of Availability of Final Eastern Pacific Northern Fur Seal Stock Conservation Plan  

Federal Register 2010, 2011, 2012, 2013, 2014

...Testa, C.E.C. Goertz, R.R. Ream, and J.T. Sterling. 2006. Ultrasonographic characterization of reproductive anatomy and early embryonic detection in the northern fur seal (Callorhinus ursinus) in the field. Marine Mammal Science...

2007-12-28

305

Flight effects of fan noise  

NASA Technical Reports Server (NTRS)

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

Chestnutt, D. (editor)

1982-01-01

306

Depression After Heart Attack  

MedlinePLUS

... state of affairs in cardiology. In the late 1970s, there were several clinical trials that tested ?- ... Lichtman JH , Bigger JT Jr . , Blumenthal JA , Frasure-Smith N , Kaufmann PG , Lespérance F , Mark DB , Sheps ...

307

Use of Existing Institutional Resources: An Urban Medical Center and A Rural Model  

ERIC Educational Resources Information Center

Case studies are presented of the development of primary health care programs at Columbia-Presbyterian Medical Center, New York City, by John Roglieri, and at Dartmouth Medical School by Thomas Almy. (JT)

Roglieri, John L.; Almy, Thomas

1975-01-01

308

Cool's Clams Casino  

ERIC Educational Resources Information Center

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

Cobey, Paul; Williams, David E.

1977-01-01

309

Exploration of Home Economics Related Occupations in Clothing  

ERIC Educational Resources Information Center

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

Thomas, Virginia F.; Plumb, Sandra

1976-01-01

310

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

311

Reference genome sequence of the model plant Setaria  

E-print Network

and Department of Plant Biology, University of Georgia,California, USA. 7 Plant Systems Biology Group, BiosciencesBiology, Jacksonville State University, Jacksonville, Alabama, USA (J.T. ); Center for Plant

2012-01-01

312

Edinburgh Research Explorer Extracellular palladium-catalysed dealkylation of 5-fluoro-1-  

E-print Network

| Accepted 17 Jan 2014 | Published 13 Feb 2014 Extracellular palladium-catalysed dealkylation of 5-fluoro-1-uracil as a bioorthogonally activated prodrug approach Citation for published version: Weiss, JT, Dawson, JC, Macleod, KG

Millar, Andrew J.

313

Consumer-Homemaking for Teenage Parents  

ERIC Educational Resources Information Center

Describes a successful Jefferson County, Georgia, pilot program for teenage parents. The program for male and female high school students includes a counseling component and curriculum focus on prenatal-postnatal care, child care and development, and health services. (JT)

Webb, Jackie Roger; Edenfield, Myrtice

1977-01-01

314

Curricular Sense and Sanity  

ERIC Educational Resources Information Center

Discusses, from a college standpoint, the curriculum of a secondary school whose pupils are looking forward to college. Indicates that amid social change students will continue to need science and mathematics, history, fine arts, foreign languages, and English. (JT)

Korfmacher, William Charles

1975-01-01

315

Sharing Teaching Ideas  

ERIC Educational Resources Information Center

A familiar Christmas song described as a second-year algebra problem is presented in "The Twelve Days of Christmas". Five strategies for solving inequalities are discussed in "Solving Algebraic Inequalities". (JT)

Mathematics Teacher, 1977

1977-01-01

316

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

EPA Science Inventory

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

317

Abdominal aortic aneurysm repair - open  

MedlinePLUS

... to your legs, your kidneys, or other organs Spinal cord injury Wound breaks open Wound infections ... al: DREAM Study Group. Long-term outcome of open or endovascular ... Trial Investigators, Grenhalgh RM, Brown LC, Powell JT, Thompson ...

318

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

319

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

Microsoft Academic Search

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

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

2005-01-01

320

Mercyhurst College Faculty Handbook. 1975-76.  

ERIC Educational Resources Information Center

College goals, administrative structure (with organizational chart), faculty personnel policies, and general college policies are included in this faculty handbook. Appendices contain the College Senate Constitution and faculty performance evaluation forms. (JT)

Mercyhurst Coll., Erie, PA.

321

REGISTRATION FORM University Mathematics in Perspective, University of Leeds, Devonshire Hall  

E-print Network

did you hear about his event? School of Maths website School/College: .................................................................. E-mail Address: ........................................................................... School, School of Mathematics, University of Leeds, Woodhouse Lane, LEEDS, LS2 9JT If you have any questions

Haase, Markus

322

Capturing Heterogeneity in Gene Expression Studies by Surrogate Variable Analysis  

E-print Network

Capturing Heterogeneity in Gene Expression Studies by Surrogate Variable Analysis Jeffrey T. Leek1 and reproducibility of analyses in genome-wide expression studies. Citation: Leek JT, Storey JD (2007) Capturing

Storey, John D.

323

Nutrition and Cystic Fibrosis: Changes through Life  

MedlinePLUS

... or GT); • the intestine (jejunostomy or JT). Cystic Fibrosis: Changes Through Life Cystic Fibrosis–Related Diabetes (CFRD) Diabetes related to CF occurs ... of the American Dietetic Association. utrition N • Cystic Fibrosis: Changes Through Life —————————————————————

324

SIDE DETAIL OF LEFT ENGINE MAINTENANCE. FLAPS ARE RESTRAINED WITH ...  

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

SIDE DETAIL OF LEFT ENGINE MAINTENANCE. FLAPS ARE RESTRAINED WITH LOCKS TO FACILITATE LUBRICATION. ENGINE IDENTIFIED AS #709075, PRATT & WHITNEY 200 JT 8 MODEL. - Greater Buffalo International Airport, Maintenance Hangar, Buffalo, Erie County, NY

325

The Problem of Last Hired, First Fired: Retroactive Seniority as a Remedy Under Title VII  

ERIC Educational Resources Information Center

Federal courts have developed contradictory answers in considering preferable remedies for discriminatory seniority systems in employment. The author offers suggestions for development of a uniform policy called for in the Supreme Court decision in Franks v. Bowman Transportation Co. (JT)

Feil, Clyde Hurt

1975-01-01

326

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

E-print Network

71 Johnson, K.E., Brady, J.B., MacFarlane, W.A., Thomas, R.B., Poulsen, C.J., and Sincock, M, Monterey, California 93940, USA, volcan@mac.com. #12;72 K.E. Johnson et al. INTRODUCTION Lenses of deformed Kathleen E. Johnson* Department of Geology and Geophysics, University of New Orleans, New Orleans

Brady, John B.

327

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

E-print Network

) and for the simulated rain gauge data based on downscaling. Upper and lower quartiles from 50 downscaling simulations structure function Sq(T) for one rain gauge-year of data and for the simulated rain gauge data based all 9 gauge-years of data and compares these with the results from 50 simulated gauge series produced

Baxter, Paul D.

328

Venditti, J.G., J.T. Minear, P.A. Nelson, J. Wooster, W.E. Dietrich (2006), Response of alternate bar topography to variation in sediment supply in gravel-bedded rivers, Eos Trans. AGU, 87(52), Fall Meet. Suppl., Abstract H51G-0583.  

E-print Network

discharge and unimodal sediments, but with gravel ranging in size from 2 to 45 mm. In both experiments, we bar topography to variation in sediment supply in gravel-bedded rivers, Eos Trans. AGU, 87(52), Fall Meet. Suppl., Abstract H51G-0583. Response of alternate bar topography to variation in sediment supply

Venditti, Jeremy G.

329

Wooster, J.K., J.G. Venditti, J.T. Minear, Y. Cui, S. Dusterhoff, R. Humphries, P. Nelson, W. Dietrich, L. Sklar (2006), Investigations of Sediment Pulse Morphodynamics in a Flume with Fixed Bars, Eos Trans. AGU, 87(52), Fall Meet.  

E-print Network

of anthropogenically introduced sediment to a river system (i.e., through dam removal or gravel augmentation) requires designed to model sediment release from a dam removal. The volume of the small pulses was approximately was designed to replicate conditions typical of those downstream of dams where upstream sediment supply has

Venditti, Jeremy G.

330

Nonconvex programming techniques based on functional moments  

E-print Network

6, = Max(6, ? ~ O. I jt j-l, t) j-l, t[ MM(I) = Max(O. ) = M; I=1, 2, . . . k ~M1=0 ~M2=0 M22=0 =0 &6 t ? 1 ERROR Computation of Ml &6 r. =l M1=Z6 2 t'=I " Block condition YES . NO j & ] Locate the block above 6 jt LOCB = B3(t, 3, k-1...

Martin, Jacques

1976-01-01

331

SOME RECENT RESULTS ON THE KINETIC THEORY OF PHASE TRANSITIONS  

E-print Network

(t; x) + @ x (V (t; x)f(t; x)) = 0 in R + t #2; R + x ; V (t; x) = a(x)c(t) b(x); c(t) + Z 1 0 xf(t; x) dx = #26; > 0; f jt=0 = f 0 in R + x ; c jt=0 = c 0 : (1.1) This equation has been introduced of our recent work on the Becker-Doring (BD) and Lifshitz-Slyozov (LS) models. The main issues addressed

Goudon, Thierry

332

Development of a CO2 Laser Collective Thomson Scattering Fast Ion\\/Alpha Particle Diagnostic  

Microsoft Academic Search

A collective Thomson scattering diagnostic is being developed for the measurement of confined fast ions in hot, dense plasmas such as the ion tail in JT-60U and the alphas produced in a burning reactor or the upgraded JET device. A CO2 laser scattering system has been installed on JT-60U for this purpose. The diagnostic also has the capability of measuring

Roger K. Richards; Donald P. Hutchinson

2000-01-01

333

Recent experimental and analytic progress in the Japan Atomic Energy Research Institute Tokamak60 Upgrade with W-shaped divertor configuration  

Microsoft Academic Search

The Japan Atomic Energy Research Institute (JAERI) completed the divertor modification of the JAERI Tokamak-60 Upgrade (JT-60U) [Y. Koide and the JT-60 Team, Phys. Plasmas 4, 1623 (1997)] in June, 1997, and experiments with the W-shaped pumped divertor have been carried out. The helium exhaust was demonstrated in the steady state by using helium neutral beam injection (NBI). The ratio

H. Shirai

1998-01-01

334

Progress in confinement and stability with plasma shape and profile control for steady-state operation in the Japan Atomic Energy Research Institute Tokamak60 Upgrade  

Microsoft Academic Search

This paper describes the latest achievements of the Japan Atomic Energy Research Institute Tokamak-60 Upgrade (JT-60U) [H. Kimura and the JT-60 Team, Phys. Plasmas 3, 1943 (1996)] for the establishment of the physics and technology basis for steady-state, fully noninductive current-drive plasmas with high fusion performance. Recent results are highlighted by (1) high performance reversed-magnetic-shear discharges [an idealized equivalent QDT

Yoshihiko Koide

1997-01-01

335

Latest progress in steady state plasma research on the Japan Atomic Energy Research Institute Tokamak60 Upgrade  

Microsoft Academic Search

The JT-60U [Y. Kusama and the JT-60 team, Phys. Plasmas 6, 1935 (1999)] high performance plasmas, such as high poloidal-beta high-confinement mode (high betap H-mode) and reversed magnetic shear (RS) plasmas, have been optimized towards a regime of steady state operation concerning high confinement, high beta and high bootstrap current fraction which are requirements of a steady state fusion plasma.

S. Ide

2000-01-01

336

Comparison of particle confinement in the high confinement mode plasmas with the edge localized mode of the Japan Atomic Energy Research Institute Tokamak60 Upgrade and the DIII-D tokamak  

Microsoft Academic Search

Particle confinement was compared for the high confinement mode plasmas with the edge localized mode in the Japan Atomic Energy Research Institute Tokamak-60 Upgrade (JT-60U) [S. Ishida, JT-60 Team, Nucl. Fusion 39, 1211 (1999)] and the DIII-D tokamak [J. L. Luxon et al., Plasma Physics and Controlled Nuclear Fusion Research 1986 (International Atomic Energy Agency, Vienna, 1987), Vol. 1, p.

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

2001-01-01

337

Comparison of particle confinement in the high confinement mode plasmas with the edge localized mode of the Japan Atomic Energy Research Institute Tokamak60 Upgrade and the DIII-D tokamak  

Microsoft Academic Search

Particle confinement was compared for the high confinement mode plasmas with the edge localized mode in the Japan Atomic Energy Research Institute Tokamak-60 Upgrade (JT-60U) [S. Ishida, JT-60 Team, Nucl. Fusion 39, 1211 (1999)] and the DIII-D tokamak [J. L. Luxon &etal;, Plasma Physics and Controlled Nuclear Fusion Research 1986 (International Atomic Energy Agency, Vienna, 1987), Vol. 1, p. 159

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

2001-01-01

338

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

Microsoft Academic Search

Joule-Thomson (J-T) cryocoolers using gas mixture have been studied theoretically and experimentally for a variety of applications. Gas separation technology using polymer membrane is emerging. In this paper the concept of coupling the J-T cooler with a hollow fiber membranes is presented. The apparatus can be used in many applications, like compressed natural gas (CNG) purification and condensation into LNG

A. Piotrowska; M. Chorowski

2008-01-01

339

Algorithmic Statistics Peter Gacs, John T. Tromp, and Paul M.B. Vitanyi  

E-print Network

Algorithmic Statistics P´eter G´acs, John T. Tromp, and Paul M.B. Vit´anyi Abstract-- While was supported in part by NSF and by NWO under Grant B 62-551. The work of J.T. Tromp was supported in part.S.A. Email: gacs@bu.edu. J.T. Tromp is with CWI, Kruislaan 413, 1098 SJ Amsterdam, The Nether- lands. Email

Gacs, Peter

340

{ital H}{bold {circle_times}}{ital h}: A Jahn-Teller Coupling That Really Does Reduce the Degeneracy of the Ground State  

Microsoft Academic Search

In all linear Jahn-Teller (JT) systems studied to date, the ground state, after allowing for the vibronic interaction, has always been of the same symmetry as the original electronic state. Furthermore, the ground state remains the same symmetry for all coupling strengths. We now report results for the {ital H}{circle_times}{ital h} JT system (as occur in various states of the

C. P. Moate; M. C. OBrien; J. L. Dunn; C. A. Bates; Y. M. Liu; V. Z. Polinger

1996-01-01

341

Automatic Vectorising Compilation At Glasgow Paul Cockshott  

E-print Network

,j,t; for(i=0;i255)t=255; v3[j]=t;} } [wpc@maui tests leave ret [wpc@maui tests]$ time asm/a.out real 0m0.209s user 0m0.181s sys 0m0.003s #12;Now lets use:integer; begin for i:= 1 to 100000 do v3:=v1 +: v2; { +: is the saturated add operation } end. [wpc@maui tests

Cockshott, W. Paul

342

Evidence of local lattice distortions in La{sub 1-x}SrâMnOâ provided by pulsed neutron diffraction  

Microsoft Academic Search

The pulsed neutron powder diffraction study of La{sub 1-x}SrâMnOâ reveals that the local atomic structure is significantly different from the long range structure, and these differences are important in understanding their properties. Even though the crystal structure suggests that the JahnâTeller (JT) distortion disappears quickly with Sr doping, the analysis by the pair distribution function technique indicates that locally JT

D. Louca; T. Egami

1997-01-01

343

Evidence of local lattice distortions in La1 - xSrxMnO3 provided by pulsed neutron diffraction  

Microsoft Academic Search

The pulsed neutron powder diffraction study of La1?xSrxMnO3 reveals that the local atomic structure is significantly different from the long range structure, and these differences are important in understanding their properties. Even though the crystal structure suggests that the Jahn–Teller (JT) distortion disappears quickly with Sr doping, the analysis by the pair distribution function technique indicates that locally JT distortions

Despina Louca; T. Egami

1997-01-01

344

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

345

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

NASA Astrophysics Data System (ADS)

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

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

2012-05-01

346

1078 | VOL.8 NO.12 | DECEMBER2011 | nAture methods in malaria parasites, the systematic experimental validation of  

E-print Network

of Plasmodium berghei genomic dnA (>77% A+t content) in a bacteriophage n15­based vector that can be modified-up beyond a few dozen genes per study4,5. In conventional protocols the genome of P. berghei is modified Brochet1, Katrin Volkmann1, Michael A Quail1, Arnab Pain1,2, Barry Rosen1, William Skarnes1, Julian C

Cai, Long

347

National Environmental Research Institute University of Aarhus . Denmark  

E-print Network

data for projection of SO2, NOX, NH3, NMVOC, TSP, PM10 and PM2.5 for Denmark. The emissions, NMVOC, TSP, PM10 and PM2.5 Layout: Ann-Katrine Holme Christoffersen ISBN: 978-87-7073-028-0 ISSN mobile sources 55 4.3 Fuel use and emission results (SO2, NOX, NMVOC, NH3, TSP, PM10, PM2.5) 61 4.4 Model

348

A VECX* Model of the Swiss Economy  

E-print Network

A VECX? Model of the Swiss Economy? Katrin Assenmacher-Wesche Swiss National Bank M. Hashem Pesaran Cambridge University, CIMF, and USC February 21, 2008 Abstract This paper applies the modelling strategy of Garratt, Lee, Pesaran and Shin (2003... ) to the estimation of a structural cointegrated VAR model that relates the core macroeconomic variables of the Swiss economy to current and lagged values of a number of key foreign variables. We identify and test a long-run structure between the variables. Moreover...

Assenmacher-Wesche, Katrin; Pesaran, M Hashem

349

National Environmental Research Institute Ministry of the Environment . Denmark  

E-print Network

, heavy metals, dioxins and PAH. Since 1990 the fuel consumption in stationary combustion has in- creased , NMVOC, CH4 , CO, CO2 , N2 O, PM, heavy metals, dioxin, PAH, greenhouse gas Layout: Ann-Katrine Holme 29 3.5.5 Particulate matter (PM) 30 3.5.6 Heavy metals 31 3.5.7 PAH 31 3.6 Disaggregation to specific

350

National Environmental Research Institute Ministry of the Environment . Denmark  

E-print Network

-eqv. and in 2017 a further reduction to 9.6 mio. tonnes of CO2 -eqv. is estimated. This corresponds to a reduction of 29% from 1990 to 2017. From 2002 to 2017 the reduction is estimated to 0.9 mio. tonnes CO2 -eqv, agriculture, greenhouses gases, CH4 , N2 O, CO2 , reduction sce- narios Layout: Ann-Katrine Holme

351

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

NASA Astrophysics Data System (ADS)

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

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

352

Towards a Precision Measurement of the Tritium Helium-3 Mass Difference  

NASA Astrophysics Data System (ADS)

Fitting a low-energy beta-decay spectrum near its endpoint is a direct method for determining the absolute mass scale of electron neutrinos. This is the subject of the large-scale tritium beta-decay experiment KATRIN. Besides a value (or a limit) for a sum of squares of neutrino mass eigenvalues, the fit to KATRIN data, with absolute energy calibration, will also produce a value for ``the electron endpoint for zero neutrino mass'' which is closely related to the Q-value for the beta-decay. Hence, an independent value for the tritium beta-decay Q-value, derived from the 3T - 3He mass difference, can provide a strong test of the systematics of KATRIN. The Florida State University precision Penning trap mass spectrometer has previously produced the most precise values of more than 26 atomic masses, many of which have application to neutrinoless double-beta-decay and to determining fundamental constants. The system is currently being modified for measurements of ions with small m/q ratio, and that are radioactive, to enable a precise measurement of the tritium helium-3 mass difference.

Myers, Edmund; Rana, Raman; Wesson, Bridget; Erickson, Austin

2012-03-01

353

Silver Trimer: An Interesting Coinage-Metal System with Jahn-Teller Activity  

NASA Astrophysics Data System (ADS)

Silver trimer Ag3 is believed to exhibit large amplitude motions away from the D3h configuration attributable to the single e^' mode that shows linear and quadratic Jahn-Teller (JT) activity. Both laser-induced fluorescence (LIF) and dispersed fluorescence (DF) spectra have been reported for Ag3.^1 Preliminary JT analyses for the B ^2E^''and X ^2E^' states have been based, respectively, on the LIF and DF data. However, the interpretation has been subject to some ambiguity. For the X ^2E^' state, extensive ab initio computations were carried out to calculate the linear and quadratic JT constants, the geometries and symmetries of the global minima and saddle points as well as the barrier to pseudorotation around the moat of the potential energy surface (PES). The magnitude of the spin-orbit (SO) effects for this heavy system was also determined. For the B ^2E^''state, the JT constants were obtained. For the theoretical calculations we utilized our newly constructed basis set for Ag. The JT simulations of the LIF and DF spectra were carried out by means of the SOCJT program^2 which calculates the positions of the spin-vibronic energy levels in the presence of JT and SO effects. The analysis of the JT distorted ground and excited PES's of Ag3 and their vibronic structure will be reported. ^1A. M. Ellis, E. S. J. Robles, and T. A. Miller Chem. Phys. Lett. 201, 132, 1993. ^2T. A. Barkholtz, and T. A. Miller Int. Rev. Phys. Chem. 17, 435, 1998.

Sioutis, Ilias

2005-03-01

354

PAPR Reduction of TDD-CDMA Using Joint Transmission Technique  

NASA Astrophysics Data System (ADS)

Joint transmission (JT) in time-division-duplex code-division multiple-access (TDD-CDMA) systems can provide a low peak-to-average power ratio (PAPR) for single paths, but causing a high PAPR in multipath environments. To avoid the high PAPR, we propose a new approach to JT technique by selecting certain paths instead of all paths used in JT processing so that PAPR becomes lower. The path selection proposal involves two methods; path selection by taking certain paths from all paths and by taking paths having path gains above a certain threshold value. To enhance the effectiveness of the proposed techniques, we evaluate a combination of the proposed technique with the clipping technique. We evaluate both PAPR and bit error rate (BER) performance for the proposed techniques and its combination with the clipping technique. We compare the results of the proposed techniques with conventional JT technique and the combination techniques with clipping technique. From the results of computer simulation, we show that the proposed path selection techniques perform low PAPR and good BER performance compared to the conventional JT processing. We also show that the combination of proposed path selection technique and clipping performs low PAPR performance without severe BER degradation compared to the conventional clipping technique.

Binti Harum, Norharyati; Ohtsuki, Tomoaki; Nakagawa, Masao

355

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

PubMed

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

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

2014-08-15

356

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

PubMed

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

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

2011-04-01

357

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

358

Cogeneration Economics  

E-print Network

%~xpoltt 40 %60/te-wn~ (2.8 miiiion 06 TOEl among with a iaJtg~ paJtt in ~~ctJt.icLty bought to th~ gltid 3 bn 06 ~Wh and 1 bn ~Wh nvr.a..t~d. Fo... %. Sinc~ th~n, t.hil> 6haJt~ hM 6aU~n. In 1981, In indu~ g~nvr.a..t~d oniy 64.4 billion ~Wh 6/t te6 than thJt~~ p~c.~nt 06 th~ 2.400 billion ~Wh 9~nvr.a..ted. Today, c.og~n~on 06 h~cU and pow~ iJ, /t~c~ving mo/t~ att~ntion by ~neJtgy ~c...

Mongon, A.

1984-01-01

359

Potential improvements in turbofan engine fuel economy  

NASA Technical Reports Server (NTRS)

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

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

1976-01-01

360

Joule-Thomson cryogenic cooler with extremely high thermal stability  

NASA Technical Reports Server (NTRS)

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

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

1991-01-01

361

Orbital correlations in the pseudocubic O and rhombohedral R phases of LaMnO3.  

PubMed

The local and intermediate structure of stoichiometric LaMnO3 has been studied in the pseudocubic and rhombohedral phases at high temperatures (300-1150 K). Neutron powder diffraction data were collected and a combined Rietveld and high real space resolution atomic pair distribution function analysis was carried out. The nature of the Jahn-Teller (JT) transition around 750 K is confirmed to be orbital order to disorder. In the high-temperature orthorhombic (O) and rhombohedral (R) phases, the MnO6 octahedra are still fully distorted locally. More importantly, the intermediate structure suggests the presence of local ordered clusters of diameter approximately 16 A ( approximately 4 MnO6 octahedra) implying strong nearest-neighbor JT antiferrodistortive coupling. These clusters persist well above the JT transition temperature even into the high-temperature R phase. PMID:15904332

Qiu, Xiangyun; Proffen, Th; Mitchell, J F; Billinge, S J L

2005-05-01

362

Nome Issue 8  

E-print Network

on the Human. "Spalte me YOM Human p.ia.Wude.-6, wk.. I have been :to YOM gove.Jtn men-t; I have .6een :the Gene.-6i.6 inoottma.:tion and YOM OWn !tepoJt:t." "Then you know how b!tave..iy YOM .6 on met hi.6 death," Kirk repl ied sof tly. The Human held a...Jt.{ng /Urn .to U6, and .to bJt.{ng .that wfU.c.h he. gave. you - - fU..6 ka tr a, IU6 liv~ng .6p~." "SJJc.," Kirk absently put down his drink on a convenient table, "YOM .6on me.ant mone. .to me. .than you c.an know. I'd've. g~ve.n my li6e. ~6 a woul...

Multiple Contributors

1985-01-01

363

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

364

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

NASA Technical Reports Server (NTRS)

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

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

1984-01-01

365

Vacuum insulation of the high energy negative ion source for fusion applicationa)  

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

366

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

367

MATE program: Erosion resistant compressor airfoil coating, volume 2  

NASA Technical Reports Server (NTRS)

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

Freling, Melvin

1987-01-01

368

Statistical mechanical lattice models of endohedral and exohedral xenon adsorption in carbon nanotubes and comparison with Monte-Carlo simulations  

NASA Astrophysics Data System (ADS)

Adsorption of xenon in carbon nanotubes has been investigated by Kuznetsova et al. [A. Kuznetsova, J.T. Yates Jr., J. Liu, R.E. Smalley, J. Chem. Phys. 112 (2000) 9590] and Simonyan et al. [V. Simonyan, J.K. Johnson, A Kuznetsova, J.T. Yates Jr., J. Chem. Phys. 114 (2001) 4180] where endohedral adsorption isotherms show a step-like structure. A matrix method is used for calculation of the statistical mechanics of a lattice model of xenon endohedral adsorption which reproduces the isotherm structure while exohedral adsorption is treated by mean-field theory.

Dunne, Lawrence J.; Manos, George; Rekabi, Mahdi

2009-01-01

369

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

NASA Astrophysics Data System (ADS)

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

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

2014-04-01

370

Enhancement of the Jahn-Teller distortion by magnetization in manganites  

NASA Astrophysics Data System (ADS)

Using measurements of resonant x-ray scattering from a LaMnO3/SrMnO3 superlattice grown on SrTiO3(001), we present experimental evidence for the enhancement of the Jahn-Teller distortion by magnetic ordering in manganites. With a specially tuned periodicity of the superlattice, scattering due to the Jahn-Teller (JT) distortion is separated from charge and magnetic scattering. The measured JT distortion is markedly enhanced upon the emergence of magnetization and strongly correlated with the spin ordering in the superlattice. Such strong correlation reveals the nature of electron-electron interaction for orbital ordering in manganites.

Chu, Y. Y.; Wu, H. H.; Liu, S. C.; Lin, Hsiu-Hau; Matsuno, J.; Takagi, H.; Huang, J. H.; van den Brink, J.; Chen, C. T.; Huang, D. J.

2012-03-01

371

Hyperparathyroidism–jaw tumor syndrome: a report of three large kindred  

Microsoft Academic Search

Background  Hyperparathyroidism–jaw tumor syndrome (HPT–JT) is a rare autosomal disease caused by inactivating germ-line mutations of\\u000a HRPT2 gene, with subsequent loss of Parafibromin expression. It is characterized by familial HPT, ossifying jaw tumors, and other\\u000a associated neoplasms.\\u000a \\u000a \\u000a \\u000a Methods  Clinical, histopathological, and genetic features of three large Italian unrelated HPT–JT kindred were assessed.\\u000a \\u000a \\u000a \\u000a Results  Three different germ-line HRPT2 inactivating mutations were identified. Seventeen affected

Maurizio Iacobone; Giulia Masi; Luisa Barzon; Andrea Porzionato; Veronica Macchi; Francesco Antonio Ciarleglio; Giorgio Palù; Raffaele De Caro; Giovanni Viel; Gennaro Favia

2009-01-01

372

Low-altitude atmospheric wind measurement from the combined Mie and Rayleigh  

E-print Network

linewidth, 100 MHz, and Z.-S. Liu, D. Wu, J.-T. Liu, K.-L. Zhang, W.-B. Chen, and X.-Q. Song by Doppler lidar with an iodine filter Zhi-Shen Liu, Dong Wu, Jin-Tao Liu, Kai-Lin Zhang, Wei-Biao Chen, Xiao

373

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

E-print Network

This is the pre-peer reviewed version of the following article: Randell, R., Ruddle, R., Quirke, P Brenner Building, St. James's University Hospital, Leeds LS9 7TF, UK b School of Computing, University of Leeds, LS2 9JT, UK c St. James's University Hospital, Leeds Teaching Hospitals NHS Trust Corresponding

Berzins, M.

374

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

E-print Network

This is the pre-peer reviewed version of the following article: Randell, R., Ruddle, R., Quirke, P, Wellcome Trust Brenner Building, St. James's University Hospital, Leeds LS9 7TF, UK b School of Computing, University of Leeds, LS2 9JT, UK c St. James's University Hospital, Leeds Teaching Hospitals NHS Trust

Magee, Derek

375

Thermoelectroelastic solutions for internal bone remodeling under axial and transverse loads  

E-print Network

School of Aerospace, Mechanical, Mechatronic Engineering, University of Sydney, City Road, Sydney, NSW and * Corresponding author. Address: School of Aerospace, Mechanical, Mechatronic Engineering, AMME, University 2006, Australia c School of Civil Engineering, The University of Leeds, Leeds LS2 9JT, UK Received 24

Qin, Qinghua

376

Implementing a flexible network Lasse Bang Dalegaard  

E-print Network

, high- performance packet processing engines like the network stacks in Linux and FreeBSD or the Click i moderne netværksteknologi har affødt højt-ydende systemer som netværksstakkene i Linux og FreeBSD

377

LATE QUATERNARY EVOLUTION OF THE NORTHEAST FAN, OFFSHORE NOVA SCOTIA  

E-print Network

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

Beaumont, Christopher

378

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

EPA Science Inventory

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

379

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

E-print Network

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

Krylov, Anna I.

380

Proceedings of Student-Faculty Research Day, CSIS, Pace University, May 6th Investigation of Two Licensed Biometric Products  

E-print Network

biometrics using Neurotechnology's VeriLook and VeriFinger software. More specifically, the vulnerability of face and fingerprint biometrics under conditions that can potentially mislead the system Investigation of Two Licensed Biometric Products J.F. Amadiz, J.T. Liu, G. Lugones, S. Tripuraneni, A

Tappert, Charles

381

Department Staff PRODUCTION MANAGER...............................Darrell F. Winn  

E-print Network

....................................Angie Kight SCENE TECHNICIAN/PROPERTIES......................Byron Rudrow SCENE TECHNICIAN/CHARGE ARTIST.....................Jason Masino SCENE SHOP ASSISTANTS..............Liz Andrews, Kevin Ganger, Heidi Kendrick, James Keith, Jennifer McEwen, JT Reece, Samuel Shirley, Kevin Shunta, LIGHTING ASSISTANTS..................Mark Ferrando

Hernes, Peter J.

382

Tort Law: Psychotherapist-Patient Privilege--Patient's Dangerous Condition--Confidentiality--Legal Duty to Warn Potential Victim  

ERIC Educational Resources Information Center

After telling a psychologist his intentions to kill Tatiana Tarasoff, Prosenjit Poddar did so. In Tarasoff v. Regents of University of California the psychologist was found liable for not warning the victim of danger. The author contends that the decision, in terms of medical capabilities, may be ahead of its time. (JT)

Burns, Robert E.

1975-01-01

383

Wednesday, February 4, 2004 Search Archives  

E-print Network

Subscribe About us Contact us Privacy Policy Advertise Nifco Shukan ST JT Weekly Travel Service Travel, repeated Japan's desire to host the world's first prototype nuclear fusion reactor in Rokkasho, Aomori late last year, the U.S. and South Korea supported the Japanese plan, while Russia and China endorsed

384

Saturday, January 24, 2004 Search Archives  

E-print Network

Subscribe About us Contact us Privacy Policy Advertise Nifco Shukan ST JT Weekly Travel Service Travel and remote control center for an international nuclear fusion project should built in France been unable to agree on where the world's first prototype nuclear fusion reactor should be located

385

Monday, December 22, 2003 Search Archives  

E-print Network

Subscribe About us Contact us Privacy Policy Advertise Nifco Shukan ST JT Weekly Travel Service Travel energy project failed Saturday to reach an accord on the venue for the world's first prototype nuclear fusion reactor due to a sharp division over the two rival sites in Japan and France. Decision on nuclear

386

Pregnancy and Sex-Based Discrimination in Employment: A Post-Aiello Analysis  

ERIC Educational Resources Information Center

Assesses the effect of the Supreme Court decision, Geduldig v. Aiello, on the interpretative guidelines of the Equal Employment Opportunity Commission (EEOC), which in enforcing Title VII of the Civil Rights Act treats pregnancy like any other temporary disability. Concludes that the Court should give "great deference" to the EEOC guidelines. (JT)

Levine, Joanne L.

1975-01-01

387

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

388

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

389

Labor Law: The Equal Employment Opportunity Commission Is Not Limited to 180 Days From the Filing of a Charge in Which to Bring Suit Against an Employer. (EEOC v. Cleveland Mills Co., 502 F.2d 153 (4th Cir. 1974)  

ERIC Educational Resources Information Center

Discusses the legality of Equal Employment Opportunity Commission (EEOC) action against Cleveland Mills Co. over four years after charges were filed with the EEOC in 1968. Concludes that the circuit court was right in reversing the district court decision that the EEOC has a time limit on its right to sue. (JT)

Wharton, Larry

1975-01-01

390

Development of a Computational Paradigm for Laser Treatment of Cancer  

E-print Network

of male patients, and breast cancer for 32% of the cancer deaths of female patients in the United StatesDevelopment of a Computational Paradigm for Laser Treatment of Cancer J.T. Oden1 , K.R. Diller2 , C Cancer Center, Department of Diagnostic Radiology, Houston TX 77030, USA {jhazle, jstafford

Texas at Austin, University of

391

The French Lesson: The Right to Culture  

ERIC Educational Resources Information Center

Noting that "career education is only the latest in the grand parade of American learning fads," the author points out that despite the proliferation of technology in France and the habit of accepting American fads, the French still consider education to have three aims--for work, for public life, for private life. (JT)

Gagnon, Paul

1975-01-01

392

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

393

Preliminary design study of astronomical detector cooling system  

NASA Technical Reports Server (NTRS)

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

Norman, R. H.

1976-01-01

394

Age Discrimination in Campus Employment  

ERIC Educational Resources Information Center

This analysis of the Age Discrimination in Employment Act of 1967 (ADEA) traces the issues that have emerged in litigation and summarizes the developing law, showing the implications in the university context and suggesting rules of thumb for accommodating the Act with the valid educational demands of the affected institutions. (JT)

Haslam, C. L.

1975-01-01

395

Geoinformatics 2004 Proc. 12th Int. Conf. on Geoinformatics -Geospatial Information Research: Bridging the Pacific and Atlantic  

E-print Network

Geoinformatics 2004 Proc. 12th Int. Conf. on Geoinformatics - Geospatial Information Research of Computing, Leeds LS2 9JT, United Kingdom, agc@comp.leeds.ac.uk Abstract Research has previously been, little work has been done in building a calculus of relations between disconnected network-based mobile

Leeds, University of

396

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

397

From Proceedings, 10 th ASCE Eng. Mech. Specialty Conference Boulder, Colorado, Vol. 2, 1995, pp. 1171--1174  

E-print Network

of ocean waves at arbitrary water depths. We derive convenient new analytical results for wave moments of the most fundamental nonlinearities in ocean engineering: the wave elevation j(t) at a fixed spatial or (2) regular Stokes waves that fail to pre­ serve S j (!), the wave power spectrum. Several drawbacks

Sweetman, Bert

398

JOURNAL DE PHYSIQUE IV Colloque (77, suppl6ment au Journal de Physique 111,Volume 3, novembre 1993  

E-print Network

Advances in aluminium alloy products for structural applications in transportation J.T. STALEY and D materials varying from Al-Li alloys for thick structure, high-strength plate and extrusions for wings castings are joined to thin 6XXX extrusions which must combine formability, strength, ductility

Paris-Sud XI, Université de

399

AEROSPACE COMPUTATIONAL DESIGN LABORATORY A Methodology for Integrated Conceptual  

E-print Network

by aviation noise ­ 60% improvement in aircraft fuel efficiency ­ Reductions due to improved technology · Pace Cycle (JT9D Interpolation) Atmosphere Airplane Physical Model (dv/dt=~) Integrated Noise Model Cost Model Time to Climb Fuel Burn NoiseCost Pilot Inputs Configuration Inputs #12;AEROSPACE COMPUTATIONAL

Peraire, Jaime

400

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

E-print Network

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

Beaumont, Christopher

401

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

E-print Network

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

Beaumont, Christopher

402

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

E-print Network

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

Sites, James R.

403

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

E-print Network

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

Mousseau, Timothy A.

404

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

E-print Network

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

Maini, Philip K.

405

WEIGHTED NEIGHBORHOOD CLASSIFIER FOR THE CLASSIFICATION OF IMBALANCED TUMOR DATASET  

E-print Network

Computing Lab, Institute of Intelligent Machines, Chinese Academy of Science, Hefei, China jt slwang@hotmail.com XUELING LI Intelligent Computing Lab, Institute of Intelligent Machines, Chinese Academy of Science, Hefei, China xlli@iim.ac.cn JUN-FENG XIA Intelligent Computing Lab, Institute of Intelligent Machines, Chinese

Hefei Institute of Intelligent Machines

406

English Literature as a Passive Catalyst to Success in English Language at the School Certificate/General Certificate of Education 0-Level Examination  

ERIC Educational Resources Information Center

Reports research in Sierra Leone investigating whether the study of English Literature influences secondary school pupils' competence in English language. Grades of 663 pupils who took both courses were compared with those of 490 who took only language. Results indicate that literature did not aid in language study. (JT)

Labor, Adonis F.; Sengova, Mathew J.

1974-01-01

407

The Coagulation Method of Starting Lecture-Discussion Courses  

ERIC Educational Resources Information Center

Describes a method used in the first class periods of a foundations of education course of 20-35 students to introduce students to each other and develop the interpersonal climate necessary for an effective discussion course. Involves breaking up into groups of five strangers for personal introductions and later class presentations. (JT)

Nyberg, David

1976-01-01

408

The Origins of the University Grants Committee  

ERIC Educational Resources Information Center

This historical study of the British University Grants Committee, focusing on its origins and establishment in 1919, concludes that despite recent criticism no country has created a grant-awarding body so free from political interference and prejudice for supporting its universities at the state or federal level. (JT)

Hutchinson, Eric

1975-01-01

409

Selected invited addresses Our faculty members have been giving invited  

E-print Network

Conf. Networks, Santa Fe. NM. Kozen. Int. Conf. Logic for Programming, Artificial Intelligence Computing, Glen Eden Beach, OR. Selman. Plenary. Intl. Jt. Conf. Artificial Intelligence (IJCAI), Edinburgh Program Analysis for Software Tools and Engineering, Lisbon, Portugal. ___. 3rd Ann. ACM Workshop Formal

Keinan, Alon

410

A Professional Supply and Demand Analysis  

ERIC Educational Resources Information Center

A model procedure for supply-and-demand forecasting is presented that can be adapted to many disciplines and can aid in avoiding an under- or over-supply of professionals. The model is illustrated with an examination of the supply and demand of veterinarians in the Southern Regional Education Board area. (Editor/JT)

McLaughlin, Gerald W.

1975-01-01

411

Evaluation of an Audio Cassette Tape Lecture Course  

ERIC Educational Resources Information Center

An audio-cassette continuing education course (Selected Topics in Pharmacology) from Extension Services in Pharmacy at the University of Wisconsin was offered to a selected test market of pharmacists and evaluated using a pre-, post-test design. Results showed significant increase in cognitive knowledge and strong approval of students. (JT)

Blank, Jerome W.

1975-01-01

412

Control of alongshore-oriented sand spits on the dynamics of a wave-dominated coastal system (Holocene deposits, northern Gulf of Lions, France)  

E-print Network

(Holocene deposits, northern Gulf of Lions, France) Olivier Raynal a, , Frédéric Bouchette a,1 , Raphaël Communicated by J.T. Wells Keywords: sand spit transgression deglacial deposits Gulf of Lions alongshore drift coastal tract The Maguelone shore extends along the northern coast of the Gulf of Lions, west of the Rhône

Demouchy, Sylvie

413

Effective Hamiltonian for high- Tc ceramics, (…)CU mO n- x  

NASA Astrophysics Data System (ADS)

A new perspective on the Animalu nonlocal pairing model of high- Tc superconductivity is reported, currently stressing the possible interband (Cu3d-02p) charge transfer matrix ( t). The mean-field Suhl-Matthias-Walker-type Hamiltonian obtained reveals hybrid and nonhybrid Cooper-pair wavefunctions, the latter manifesting anomalous splitting of quasiparticle energy. This result, presently interpreted as the Jahn-Teller (JT) effect, is briefly discussed in the context of data on the Cu-O bond length. In our brief Green's function analysis, an approximate t-dependence of the nonlocal pair potential ( Vij, i ? j) and a semi-empirical expression for the JT stabilisation energy (E JT), which we believe to be new, are presented. Numerical estimates of E JT for YBa 2Cu 3O 6.9 compare well with photoemission data. Normal state energies obtained in the model are in excellent qualitative or quantitative agreement with the Mott-Hubbard picture, results from the Gutzwiller approximation of the Emery model and Ohkawa's breathing mode scheme for the copper ceramic oxides.

Asomba, George C.

1996-02-01

414

Dental Topics for Medical Students  

ERIC Educational Resources Information Center

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

Lorber, Mortimer

1976-01-01

415

Alaskan National Park Glaciers: Status and Trends First Progress Report: September 30, 2011  

E-print Network

Alaskan National Park Glaciers: Status and Trends First Progress Report: September 30, 2011 Minor photo: Margerie Glacier in July 2011 with Grand Pacific Glacier debris-covered terminus in foreground. Glacier Bay National Park and Preserve July 13, 2011. JT Thomas photo. Above: A valley recently

Loso, Michael G.

416

Advances in the CO2 laser collective Thomson scattering fast ion\\/alpha particle diagnostic (abstract)  

Microsoft Academic Search

A collective Thomson scattering diagnostic is being developed for the measurement of confined fast ions in hot, dense plasmas. This includes such measurements as the ion tail in JT-60U and the alphas produced in a burning reactor or the upgraded Joint European Torus device. The diagnostic also has the capability of measuring the isotopic ratio of the core ions such

R. K. Richards; D. P. Hutchinson

2001-01-01

417

Dale M. Meade Presented at  

E-print Network

Large Tokamaks Tokamak Experimental Reactor LHD, W 7X JT-60 U JET TFTR Scientific Foundation Technology reactor - couple with burning plasma physics · Boundary Physics and Plasma Technology (coupled with above pumping · Neutron Resistant Materials (separate facility) - high fluence testing using "point

418

Tokamak experiments at the Japan Atomic Energy Research Institute  

Microsoft Academic Search

The paper summarizes the major experimental results obtained with the tokamak devices JFT-2, JFT-2a\\/DIVA, JFT-2M and Doublet-III. Reference is also briefly made to major achievements pertaining to the JT-60 programme as well as to fusion reactor design.

M. Tanaka

1985-01-01

419

Pure Mathematics in Australia  

ERIC Educational Resources Information Center

Reports a survey concerned with the future of mathematics in Australia which identified the number of "experts" in particular areas of mathematics who are working in Australia. Findings show increased research work in the past five years but conclusions indicate that many mathematical areas continue to be neglected. (JT)

Bloom, W. R.; And Others

1975-01-01

420

Extraction physics in volume H--ion sources  

Microsoft Academic Search

Recent hydrogen negative-ion sources (JT60, large helical device (LHD)) operate with a magnetic filter field extending up to the plasma electrode and extraction opening. As shown earlier such a magnetic field has a strong effect upon the value of the extracted negative ion and electron current. Measurements of the negative ion and electron density were performed in the ion source,

M. Bacal; A. Hatayama; T. Matsumiya; M. Hamabe; T. Kuroda; Y. Oka

2006-01-01

421

Ohio Klingon War Journal Issue 2  

E-print Network

^efiting ihe Empjre. The hnme it hi5,5o long as he can keep it. Vhen using honorifics, jt is import.nt to note, that it is ackno\\i/ledgem?nt bU others \\,/hich solidif9 the ?ntitlement. lt should also be noled th.t : commlnder cin onl! give the honorjfic...

1991-01-01

422

Operational Management of Area Environment.  

ERIC Educational Resources Information Center

Three phases leading to the automation of the mechanical building systems on the Harvard campus are described. The systems allow a single operator to monitor and control all the mechanical systems, plus fire, flood, and security alarms, for all buildings in a large area of the campus. (JT)

Sprague, George W.

423

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.

424

HOW TO SELECT THE PROPER SECURITY AND EQUIPMENT SURVEILLANCE SYSTEMS TO PROTECT YOUR FACILITIES.  

ERIC Educational Resources Information Center

IN PRESENTING A SURVEY OF MODERN SECURITY SYSTEMS, THIS BOOKLET DISCUSSES THE REQUIREMENTS FOR SURVEILLANCE AND PROTECTION OF AREAS, PERIMETER, AND OBJECTS. A VARIETY OF EQUIPMENT IS DESCRIBED WITH DISCUSSION OF OPERATING PROCEDURES, COSTS, AND RECENT DEVELOPMENTS IN SECURITY SYSTEMS. (JT)

Honeywell, Inc., Minneapolis, Minn.

425

Geophysical Prospecting, 2007, 55, 679684 Stratigraphic filtering and source penetration depth  

E-print Network

on a synthetic model. A 600 m thick basalt layer overlies two deeper reflections. E-mail: mvdbaan@earth Mirko van der Baan1 , James Wookey2 and Dirk Smit3 1School of Earth and Environment, Earth Sciences, University of Leeds, Leeds, LS2 9JT, UK, 2Department of Earth Sciences, University of Bristol, Bristol, BS8 1

van der Baan, Mirko

426

J. Micro. and Elect. Pack. 5, 101106 (2008). Broadband Dielectric Characterization of Aluminum Oxide (Al2O3)  

E-print Network

, David Tanner5 , Raj Mittra2 , and Michael Lanagan1 1 Materials Research Laboratory, Pennsylvania State of Leeds, Leeds LS2 9JT, UK 4 Materials Science and Engineering Department, University of Florida GHz to infrared frequencies. Key words: 1. Introduction Dielectric properties of ceramic materials

Tanner, David B.

2008-01-01

427

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

Federal Register 2010, 2011, 2012, 2013, 2014

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

2012-03-19

428

G. Vlad et al. THEORY OF FUSION PLASMAS -Varenna, Italy, 28/8-1/9, 2006 1 Interaction of fast particles and  

E-print Network

G. Vlad et al. THEORY OF FUSION PLASMAS - Varenna, Italy, 28/8-1/9, 2006 1 Interaction of fast. Shinohara, M. Ishikawa and M. Takechi (JT-60U); M. Schneider (CRONOS codes) #12;G. Vlad et al. THEORY et al. THEORY OF FUSION PLASMAS - Varenna, Italy, 28/8-1/9, 2006 3 Introduction - 1 · Next generation

Vlad, Gregorio

429

Adaptive Neural-Network Control for Redundant Nonholonomic Mobile Modular Manipulators  

E-print Network

modular manipulator [1]. A multi-layer NN controller, which did not need off-line learning, was designed (ANNC) is designed in task space in Section 3. Simulations are carried out in Section 4. Finally, some · ¨ + V · + G = B · + JT · Fext + C · (3) Where H, V and G denote the inertial matrix, the centripetal

Li, Yangmin

430

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

E-print Network

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

Pouliot, Jean

431

JILL T. ANDERSON Department of Ecology and Evolutionary Biology Telephone: 773-255-1996  

E-print Network

): Social behavior of capuchin monkeys (Cebus capuchinus). 1998-2000 Plant taxonomist and research assistant. 2006-2008 National Science Foundation Doctoral Dissertation Improvement Grant. Evolution of plant 447: 775. POSTERS AND PRESENTATIONS Anderson, J.T., 2007. Evolution of a native blueberry (Vaccinium

Geber, Monica A.

432

Model Based Visualization of Cardiac Virtual Tissue J W Handley, K W Brodlie, R H Clayton  

E-print Network

of Computing, University of Leeds, Leeds LS2 9JT University of Sheffield, Department of Computer Science arrhythmias such as this are an important cause of premature death in the industrialised world, yet. Slowing or blocking of the action potential can result in re-entry, and so the contribution of these ion

Brodlie, Ken

433

Applied Mathematical Models in Human Physiology September 12, 2003  

E-print Network

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

Olufsen, Mette Sofie

434

LETTER doi:10.1038/nature12957 Drought sensitivity of Amazonian carbon balance  

E-print Network

basin, with air entering the basin from the equatorial Atlantic Ocean, sweeping over the tropical at the end-of-the-basin sites Tabatinga(TAB) andRioBranco(RBA)isthusexposedtocarbonfluxes from a large Paulo CEP 05508-000, Brazil. 2 School of Geography, University of Leeds, Woodhouse Lane, Leeds LS9 2JT

Malhi, Yadvinder

435

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

436

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

E-print Network

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

Benning, Liane G.

437

Extended region of nodulation genes in Rhizobium meliloti 1021. I. Phenotypes of Tn5 insertion mutants  

SciTech Connect

Rhizobium meliloti Nod/sup -/ mutant WL131, a derivative of wild-type strain 102F51, was complemented by a clone bank of wild-type R. meliloti 1021 DNA, and clone pRmJT5 was recovered. Transfer of pRmJT5 conferred alfalfa nodulation on other Rhizobium species, indicating a role in host range determination for pRmJT5. Mutagenesis of pRmJT5 revealed several segments in which transposon insertion causes delay in nodulation, and/or marked reduction of the number of nodules formed on host alfalfa plants. The set of mutants indicated five regions in which nod genes are located; one mutant, nod-216, is located in a region not previously reported to encode a nodulation gene. Other mutant phenotypes correlated with the positions of open reading frames for nodH, nodF and nodE, and with a 2.2-kb EcoRI fragment. A mutant in nodG had no altered phenotype in this strain. One nodulation mutant was shown to be a large deletion of the common nod gene region. The authors present a discussion comparing the various studies made on this extended nod gene region.

Swanson, J.A.; Tu, J.K.; Ogawa, J.; Sanga, R.; Fisher, R.F.; Long, S.R.

1987-10-01

438

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

439

Compensation of beamlet repulsion in a large negative ion source with a multi aperture accelerator  

SciTech Connect

Excess heat loads to accelerator grids limit extension of pulse length in operation of the large negative ion sources with multi aperture accelerator. Part of the heat loads is caused by interception of deflected beamlets due to their space charge repulsion. In this paper, a beamlet steering technique using aperture offset was examined for compensation of the beamlet deflections utilizing a three dimensional beam analysis simulating the D{sup -} negative ion source of JT-60 U. The beamlet deflection was analyzed in detail using fifty beamlets, which were extracted from apertures arranged in a lattice pattern of 10x5. The simulation showed successful compensation of the beamlet deflection by aperture offsets defined according to the thin lens theory. Even if the beam energy was changed, the necessary aperture offset would not be changed maintaining the perveance and a ratio of extraction and acceleration voltage. In JT-60 U, it was shown that the aperture offset of less than 1.0 mm would be enough to compensate the repulsion of all beamlets. When the magnetic field was applied for suppression of co-extracted electrons, necessary aperture offset was estimated to be {+-}0.5 mm for 500 keV D{sup -} ion beam in JT-60 U, in addition to the offset for the space charge repulsion. This result showed good agreements with the previous experimental results and design study of the JT-60 U N-NBI.

Kashiwagi, M.; Inoue, T.; Hanada, M.; Kamada, M.; Taniguchi, M.; Umeda, N.; Watanabe, K. [Japan Atomic Energy Agency, 801-1, Nukoyama, Naka, 311-0193 (Japan); Grisham, L. R. [Princeton University, Plasma Physics Laboratory, Princeton (United States)

2009-03-12

440

Compensation of beamlet repulsion in a large negative ion source with a multi aperture accelerator  

NASA Astrophysics Data System (ADS)

Excess heat loads to accelerator grids limit extension of pulse length in operation of the large negative ion sources with multi aperture accelerator. Part of the heat loads is caused by interception of deflected beamlets due to their space charge repulsion. In this paper, a beamlet steering technique using aperture offset was examined for compensation of the beamlet deflections utilizing a three dimensional beam analysis simulating the D? negative ion source of JT-60 U. The beamlet deflection was analyzed in detail using fifty beamlets, which were extracted from apertures arranged in a lattice pattern of 10×5. The simulation showed successful compensation of the beamlet deflection by aperture offsets defined according to the thin lens theory. Even if the beam energy was changed, the necessary aperture offset would not be changed maintaining the perveance and a ratio of extraction and acceleration voltage. In JT-60 U, it was shown that the aperture offset of less than 1.0 mm would be enough to compensate the repulsion of all beamlets. When the magnetic field was applied for suppression of co-extracted electrons, necessary aperture offset was estimated to be ±0.5 mm for 500 keV D? ion beam in JT-60 U, in addition to the offset for the space charge repulsion. This result showed good agreements with the previous experimental results and design study of the JT-60 U N-NBI.

Kashiwagi, M.; Inoue, T.; Grisham, L. R.; Hanada, M.; Kamada, M.; Taniguchi, M.; Umeda, N.; Watanabe, K.

2009-03-01

441

vol. 163, no. 6 the american naturalist june 2004 Testing Small Clutch Size Models with Daphnia  

E-print Network

vol. 163, no. 6 the american naturalist june 2004 Testing Small Clutch Size Models with Daphnia Meghan A. Guinnee,* Stuart A. West, and Tom J. Little Institute of Cell, Animal, and Population Biology, University of Edinburgh, West Mains Road, Edinburgh EH9 3JT, United Kingdom Submitted October 10, 2003

West, Stuart

442

The physiological costs of being small in a parasitic wasp  

E-print Network

of Cell, Animal and Population Biology, University of Edinburgh, Kings Buildings, Edinburgh EH9 3JT, UK ABSTRACT Knowledge of the relationship between body size and fitness is essential in many models between size and fitness can depend strongly (qualitatively and quantitatively) on the environment

Rivero, Ana

443

Economics of Mechanical Cotton Stripping on Blackland Farms.  

E-print Network

. ............. Acknowledgments. i l JUlJt 10 19 a;! tio ,:ntl : lies i on tl Ion c E~onomies of Mechanical Cotton Stripping Ralph If. Rogers and C. A. Bonnen* ICRE.ASING NIIMRER OF FARMERS in the Blacklantl tighter, more storm-resistant types to permit harvest r...

Rogers, Ralph H.; Bonnen, C. A.

1960-01-01

444

Supporting Information for: Enhancing microbial reduction in hyperalkaline, chromium contaminated sediments by pH  

E-print Network

; Promega Corp., USA), and transformed into E. coli competent cells (XL1-Blue; Agilent Technologies UK Ltd LS2 9JT, UK * Corresponding Author's E-mail: i.burke@see.leeds.ac.uk / dH amended microcosm bottle on day 153 was centrifuged (10 min, 8,000 g), and the soil was stored in the dark

Burke, Ian

445

Supplemental Material Sloppiness, robustness, and evolvability in systems  

E-print Network

text. We have also posted the data files and computer codes for the models dis- cussed, at http (system biology markup language) files (3) Parameter ensembles (4) Best-fit Hessian and JT J in C (shown in red in the figure), and the columns of U are images of stiff and sloppy eigenparameters

Sethna, James P.

446

Polymorphisms in the methylenetetrahydrofolate reductase gene are associated with susceptibility  

E-print Network

, Leeds, LS2 9JT, United Kingdom Edited by Philip W. Majerus, Washington University School of Medicine, St. Louis, MO, and approved August 10, 1999 (received for review June 11, 1999) Reduction of 5 located at nucleotide 677 of the MTHFR gene results in an alanine-to-valine substitution. Up to 15

California at Berkeley, University of

447

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

E-print Network

October 2007 5 ALE simulation for JT-60U before ALE after ALE (experimental) relaxed (simulation) experiment simulation ALE!"EPM fast Frequency Sweeping (FS) modes reproduced only if distortion of EP distribution function in velocity space after ALE is retained S. Briguglio et al., PoP 14 (2007) 1-10 #12;G

Vlad, Gregorio

448

Abstract This historical review was compiled and edited by Giorgio Forti, whereas the other authors of  

E-print Network

listed in the individual sections. This review deals with the research on photosynthesis performed in Govindjee et al. [Govindjee, Beatty JT, Gest H, Allen JF (eds) (2005) Discoveries in Photosynthesis and regulation of the photosyn- thetic apparatus in higher plants, unicellular algae and in photosynthetic

449

ROTC: Where Have All the Young Men Gone?  

ERIC Educational Resources Information Center

Briefly traces the history of Reserve Officer Training Corps (ROTC), citing reasons for decreases in its enrollment from 200,000 in 1969-70 to 67,000 in 1974-75 and noting current questions as to whether or not it belongs on the nation's campuses. (JT)

Sander, Gordon F.

1975-01-01

450

A Marketing Plan That Works  

ERIC Educational Resources Information Center

Olivet College's marketing plan included survey of students, alumni, townspeople, and doners and analysis of the college's customer appeal, prices, and product mix. The author reports that the marketing objectives are being met and discusses the rationale and problems of applying business marketing principles to education. (JT)

Sparks, Jack D.

1976-01-01

451

A Couples Group of Medical Students  

ERIC Educational Resources Information Center

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

Porter, Kenneth; And Others

1976-01-01

452

DTP | Toxicology and Pharmacology Branch (TPB)  

Cancer.gov

Donzanti, B.A., J.S. Driscoll, J.E. Tomaszewski, J.S. Roth, P. Tosca, M. Placke, A. Singer, J.T. Yarrington and J.A. Kelley, 1994. Acute Cardiotoxicity of the Anti-HIV Dideoxynucleoside, F-ddA, in the Rat. Fund. Appl. Toxicol., 27, 167-176.

453

Conglobation in the pill bug, Armadillidium vulgare, as a water conservation mechanism  

E-print Network

Conglobation in the pill bug, Armadillidium vulgare, as a water conservation mechanism Jacob T this paper as: Smigel JT, Gibbs AG. 2008. Conglobation in the pill bug, Armadillidium vulgare, as a water conservation mechanism. 9pp. Journal of Insect Science 8:44, available online: insectscience.org/8.44 Journal

Ahmad, Sajjad

454

Using EPR spectroscopy to go from the Jahn-Teller effect to nuclear waste disposal  

NASA Astrophysics Data System (ADS)

Electron paramagnetic resonance (EPR) spectroscopy is a powerful technique for elucidating the fundamental solid-state-chemical and crystal-field ground-state electronic properties of rare-earth and actinide ions that are incorporated into single-crystal host materials. In the case of rare-earth or rare-earth-like ions that are characterized by a degenerate orbital doublet ground state when placed in a cubic crystal field, EPR has proven to be an extremely valuable approach to the study of various manifestations of the Jahn-Teller (J-T) effect. The contributions of EPR spectroscopy to the study of the J-T effect in ions such as La 2+, Y 2+ and Sc 2+ include the discovery of quadrupolar effects in J-T systems and a verification of Frank Ham's theory of the dynamic J-T effect. Such basic studies can often have unforeseen consequences—like leading to the discovery of new scintillators for gamma-ray detection or the development of a matrix for the disposal of radioactive waste.

Boatner, L. A.

2003-02-01

455

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

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

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

456

Photocopy of original drawing showing Building 3 layout (drawing located ...  

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

Photocopy of original drawing showing Building 3 layout (drawing located at NAWS China Lake, Division of Public Works). J.T. STAFFORD-J.H. DAVIES-H.L. GOGERTY: DISPENSARY, CONNECTING CORRIDORS, FLOOR PLAN, ELEVATIONS, AND DETAILS - Naval Ordnance Test Station Inyokern, Dispensary, Main Site, Lauritsen Road at McIntyre Street, Ridgecrest, Kern County, CA

457

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

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

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

458

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

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

Photocopy of original drawing showing Wing A (drawing located at NAWS China Lake, Division of Public Works). J.T. STAFFORD-J.H. DAVIES-H.L. GOGERTY: DISPENSARY, SICK CALL AND ADMINISTRATION, ROOF FRAMING PLAN AND DETAILS - Naval Ordnance Test Station Inyokern, Dispensary, Main Site, Lauritsen Road at McIntyre Street, Ridgecrest, Kern County, CA

459

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

460

Virtual Histology of Transgenic Mouse Embryos for High-Throughput Phenotyping  

E-print Network

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

Capecchi, Mario R.

461

Personal Characteristics of Effective and Ineffective University Leaders  

ERIC Educational Resources Information Center

Reports research attempting to differentiate the personal characteristics of effective and ineffective university leaders at the Dean level and above, as judged and rated by their administrative colleagues. A rating scale was developed of 10 personality characteristics related to the most frequently occurring leadership skills. (JT)

Skipper, Charles E.

1976-01-01

462

Education for Becoming: Two Field Programs at Antioch  

ERIC Educational Resources Information Center

Based on the premise that therapy is a way of learning, two Field Centers were developed: (1) a small group in New Mexico who studied geology, botany, wilderness survival skills and themselves, the latter using group dream study methods and (2) a group in Switzerland to study Jungian psychology including individual analysis. (JT)

Kelly, Michael; Prier, Linda

1974-01-01

463

MPI Enhancements in John the Ripper  

NASA Astrophysics Data System (ADS)

John the Ripper (JtR) is an open source software package commonly used by system administrators to enforce password policy. JtR is designed to attack (i.e., crack) passwords encrypted in a wide variety of commonly used formats. While parallel implementations of JtR exist, there are several limitations to them. This research reports on two distinct algorithms that enhance this password cracking tool using the Message Passing Interface. The first algorithm is a novel approach that uses numerous processors to crack one password by using an innovative approach to workload distribution. In this algorithm the candidate password is distributed to all participating processors and the word list is divided based on probability so that each processor has the same likelihood of cracking the password while eliminating overlapping operations. The second algorithm developed in this research involves dividing the passwords within a password file equally amongst available processors while ensuring load-balanced and fault-tolerant behavior. This paper describes John the Ripper, the design of these two algorithms and preliminary results. Given the same amount of time, the original JtR can crack 29 passwords, whereas our algorithms 1 and 2 can crack an additional 35 and 45 passwords respectively.

Sykes, Edward R.; Lin, Michael; Skoczen, Wesley

2010-11-01

464

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...

465

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

EPA Science Inventory

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

466

DTP | Toxicology and Pharmacology Branch (TPB)  

Cancer.gov

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

467

Integration host factor is required for replication of pYGK-derived plasmids in Aggregatibacter actinomycetemcomitans  

PubMed Central

In this study, we show that integration host factor protein (IHF) is required for replication of pYGK plasmids in Aggregatibacter actinomycetemcomitans. YGK plasmids were not replicated in A. actinomycetemcomitans strains lacking either the ?- or ?-subunit of IHF. However, the deletion mutants were complemented, and plasmid replication was restored when the promoter region and gene for either ihfA or ihfB was cloned into pYGK. We also identified two motifs that resemble the consensus IHF-binding site in a 813-bp fragment containing the pYGK origin of replication. Using electrophoretic mobility shift assays, purified IHF?–IHF? protein complex was shown to bind to probes containing either of these motifs. To our knowledge, this is the first report showing that plasmid replication is IHF-dependent in the family Pasteurellaceae. In addition, using site-direct mutagenesis, the XbaI and KpnI restriction sites in the suicide vector pJT1 were modified to generate plasmid pJT10. The introduction of these new unique sites in pJT10 facilitates the transfer of transcriptional or translational lacZ fusion constructs for the generation of single-copy chromosomal insertion of the reporter construct. Plasmid pJT10 and its derivatives will be useful for genetic studies in Aggregatibacter (Actinobacillus) and probably other genera of Pasteurellaceae, including Haemophilus, Pasteurella, and Mannheimia. PMID:24965736

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

2015-01-01

468

Poster Session Abstracts 69  

E-print Network

Environmental Models and Computational Methods, Bay City, MI. Wilson, J.T., Weaver, J.W., and D.H. Kampbell, 1994. Intrinsic Bioremediation of TCE in Ground Water at an NPL Site in St. Joseph, Michigan, EPA/540/R-94/515, pp.154-160. 126 Natural Attenuation of Chlorinated Solvents in a Freshwater Tidal Wetland

Transport Model Of; Jungyill Choi; Judson W. Harvey; Martha H. Conklin

469

LISA: L-Band Interference Surveyor/Analyzer LISA co-observes with existing  

E-print Network

, antenna unit control & coherent sampling subsystem Examples of RFI observed at 20,000 feet #12; spiral antenna · Spectrum analyzer for full- bandwidth monitoring of power spectral density · 14 MHz (8 command language for system control & experiment automation S.W. Ellingson, J.T. Johnson, and G.A. Hampson

Ellingson, Steven W.

470

2014 PMEL Lab Review FY2013 Journal Articles  

E-print Network

.A. Church, J.L. Conroy, C.M. Domingues, J.T. Fasullo, J. Gilson, G. Goni, S.A. Good­3127. [PDF Version] Cont. #: 3640 Baker, E.T., S.L. Walker, R.W. Embley, and C. #: 3968 Abraham, J.P., M. Baringer, N.L. Bindoff, T. Boyer, L.J. Cheng, J

471

INFECTION AND IMMUNITY, 0019-9567/99/$04.00 0  

E-print Network

, University of Edinburgh, Edinburgh EH9 3JT,2 United Kingdom Received 30 June 1999/Returned for modification more amenable to laboratory investigation, we have cloned, sequenced, and expressed cDNA encoding genetic restriction in response to native Bm20 that is overcome when recombinant, nonnative material

Allen, Judith

472

VOLUME 88, NUMBER 5 P H Y S I C A L R E V I E W L E T T E R S 4 FEBRUARY 2002 Reactions and Diffusion of Water and Oxygen Molecules in Amorphous SiO2  

E-print Network

.055508 PACS numbers: 61.72.Bb, 61.72.Ji, 61.80.­x, 66.30.Jt Amorphous silicon-dioxide is a key component. Experimental data including oxygen exchange reaction and radiation sensitivity are accounted for difference on the radiation sensitivity of SiO2 fibers [13,14]. It has been found that the rate of generation

Pantelides, Sokrates T.

473

CRIMINAL JUSTICE REVIEW -2003-2004 page 1 Centre for Criminal Justice Studies, University of Leeds  

E-print Network

CRIMINAL JUSTICE REVIEW 2003 - 2004 (Sixteenth Annual Report) law, Director, Centre for Criminal Justice Studies, School of Law, University of Leeds, Leeds LST 9JT. Tel: 0113CRIMINAL JUSTICE REVIEW - 2003-2004 page 1 Centre for Criminal Justice Studies, University of Leeds

Haase, Markus

474

Interstitial Jurisprudence Illustrated in Teaching Criminal Law  

ERIC Educational Resources Information Center

The incorporation of criminal law theory into the first-year criminal law course is discussed as an example of adding the jurisprudence of specific subject matters to standard courses. Jurisprudential issues appropriate for study are suggested along with guidelines for teaching techniques, selection of materials, and use of class time. (JT)

Funk, David A.

1975-01-01

475

Financial Aid Reports: Loans to Parents, New Help for the Middle-Income Family  

ERIC Educational Resources Information Center

Addresses the need for a national parental loan program proposing that loans up to the amount of the total expected contribution less that portion which can reasonably be expected out of current disposable purchasing power be offered as part of a total financial assistance package. (JT)

Bowman, James L.; Johnstone, D. Bruce

1975-01-01

476

Preparing Students for Effective Social Work Practice Related to Death  

ERIC Educational Resources Information Center

Describes a module in the general social work practice sequence at the University of Hawaii School of Social Work that offers students an opportunity to develop both a skill and a knowledge base, as well as an exploration of their own personal experiences with--and reactions to--death. (Editor/JT)

Lister, Larry; Gochros, Harvey

1976-01-01

477

The Corporate Law Curriculum  

ERIC Educational Resources Information Center

On the premise that corporate counsel must be an able diagnostician before he can focus on highly specialized and interrelated issues of business law, the author suggests an approach to corporate law curriculum in which the basic course balances the quality and quantity of material designed to create the needed sensitivity. (JT)

Mofsky, James S.

1976-01-01

478

Ranjith K. Annepu 3149 Broadway, Apt 6, New York, NY, 10027  

E-print Network

Ranjith K. Annepu 3149 Broadway, Apt 6, New York, NY, 10027 +1-347-260-3240, rka2109@columbia city's four-hundred year-old sewer system OTHERS Presentations Nickolas, J.T. & Ranjith, K.A. (2011 Meeting, 2011, New York, NY. Ranjith, K. A. & Nickolas, J. T. (2010), Sustainable Solid Waste Management

479

Ecology, 83(11), 2002, pp. 30863096 2002 by the Ecological Society of America  

E-print Network

STRUCTURING AND FLORAL AVOIDANCE BEHAVIOR PREVENT ANT­POLLINATOR CONFLICT IN A MEXICAN ANT-ACACIA NIGEL E Mains Road, Edinburgh EH9 3JT, UK Abstract. Ant-acacias represent a classic insect­plant mutualism­pollinator conflict in a Mexican ant-acacia, Acacia hindsii. This Acacia is guarded by a highly aggressive ant

Chittka, Lars

480

A Multi-Agent Simulation of Retail Management Practices Peer-Olaf Siebers, Uwe Aickelin  

E-print Network

for Organisational Strategy, Learning & Change, Leeds University Business School, University of Leeds, Leeds, LS2 9JT productivity, management practices, shopping behavior Abstract We apply Agent-Based Modeling and Simulation problem. When investigating the behavior of complex systems the choice of an appropriate modeling

Aickelin, Uwe

481

The Retrenchment Knife  

ERIC Educational Resources Information Center

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

Dozier, John M.

1976-01-01

482

Medical Anthropology in the Curriculum: A Revisit to the Subject  

ERIC Educational Resources Information Center

Although progress has been made in the last 15 years in the development of medical school departments with interests in the various behavioral science fields, including anthropology, based on this study only five percent of U.S. medical students had the opportunity to attend lectures in the field of medical anthropology. (Editor/JT)

Roush, Robert E.; And Others

1976-01-01

483

Investigation of JahnTeller splitting with O 1s x-ray absorption spectroscopy in strained Nd1-xCaxMnO3 thin films  

E-print Network

is the Jahn­ Teller JT distortion, which is related to the local oxygen octahedra and can be controlled.930 , thus generating a relatively stron- ger lattice distortion.25 In addition, the Ca-doping could raise Department of Physics, National Taiwan University, Taipei 106, Taiwan 4 National Synchrotron Radiation

Lin, Minn-Tsong

484

Short-range order, atomic displacements and effective interatomic ordering energies in TiN0.82 (*)  

E-print Network

distortions of the lattice. Experimentally, the short-range order (SRO) and the local distortions give rise intensity is maximum at the (1/2 1/2 1/2) type reciprocal lattice positions. Nitrogen vacancies are found, by respectively 0.042 and 0.024 A. J. Phys. France 50 (1989) 2217-2242 15 AOÃ?JT 1989, Classification Physics

Paris-Sud XI, Université de

485

Presteady-State and Steady-State Kinetics and Turnover Rate of the Mouse c-Aminobutyric Acid Transporter (mGAT3)  

E-print Network

Transporter (mGAT3) A. Sacher1 , N. Nelson1 , J.T. Ogi2 , E.M. Wright3 , D.D.F. Loo3 , S. Eskandari2 1 the J. Membrane Biol. 190, 57±73 (2002) DOI: 10.1007/s00232-002-1024-6 Correspondence to: S. Eskandari

Eskandari, Sepehr

486

Production of Artificial Lightning in An Ordinary Clear Light Bulb.  

ERIC Educational Resources Information Center

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

Zaffo, Peter Alfred

1981-01-01

487

Georg-August-Universitt Gttingen, Bereich Humanmedizin Publikationen und Hochschulschriften 2004  

E-print Network

angioplasty and stenting. STROKE, 36(2): 367-73. 6. Kastrup A, Gröschel K, Schulz JB, Nägele T, Ernemann U angioplasty and stenting. STROKE, 36(4): 787-91. 7. McKeith IG, Dickson DW, Lowe J, Emre M, O'Brien JT

Gollisch, Tim

488

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

489

14 CFR 34.1 - Definitions.  

Code of Federal Regulations, 2010 CFR

...VENTING AND EXHAUST EMISSION REQUIREMENTS FOR TURBINE ENGINE POWERED AIRPLANES General Provisions...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....

2010-01-01

490

International Journal of Artificial Intelligence in Education (1999), 10, 350-364 The defining characteristics of intelligent tutoring systems  

E-print Network

characteristics of intelligent tutoring systems research: ITSs care, precisely John Self, Computer Based Learning Unit, University of Leeds, Leeds LS2 9JT, England, E-mail: jas@cbl.leeds.ac.uk Based on an invited talk of educational, psychological and social knowledge which are often left implicit. INTRODUCTION The aim

Paris-Sud XI, Université de

491

The Need for Environmental Education for Adults  

ERIC Educational Resources Information Center

An article taken from a state-of-the-art paper given at the UNESCO/UNDP International Workshop on Environmental Education at Belgrade in October 1975. Topics include the media as environmental educators, environmental action, university-related courses, problems and opportunities, and recommendations for action. (JT)

Emmelin, Lars

1976-01-01

492

Fluid transfers at a basement/cover interface Part II. Large-scale introduction of chlorine into the basement  

E-print Network

Universities Research and Reactor Centre, East Kilbride, Glasgow G75 0QF, Scotland, UK Received 12 July 2001-les-Nancy Cedex, France b School of Earth Sciences, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, UK c ANDRA

Banks, David

493

Using the discrete wavelet frame transform to merge Landsat TM and SPOT panchromatic images  

E-print Network

@cs.ust.hk (J.T. Kwok), yaonan@mail.hunu.edu.cn (Y. Wang). 1566-2535/02/$ - see front matter Ã? 2002 Elsevier Li a,b,*, James T. Kwok a , Yaonan Wang a a College of Electrical and Information Engineering, Hunan Terre (SPOT) data have 10 m resolution but is panchromatic. By fusing the Landsat TM and SPOT PAN images

Kwok, James Tin-Yau

494

Natural selection of the critical period for language acquisition  

E-print Network

Natural selection of the critical period for language acquisition Natalia L. Komarova1,2 and Martin of Mathematics, University of Leeds, Leeds LS2 9JT, UK The language acquisition period in humans lasts about 13 acquisition devices, which di¡er in the length of the learning period. There are two selective forces

Nowak, Martin A.

495

2008 Publications Fisheries and Aquaculture  

E-print Network

1 2008 Publications Fisheries and Aquaculture Banish, N.P., J.T. Peterson, R.F. Thurow. 2008 Journal of Fisheries Management 28:176-187. Bezold, J. and D. Peterson. 2008. Lake sturgeon reintroduction. Balancing fisheries management and water uses for impounded river systems. American Fisheries Society

Hall, Daniel

496

The Accuracy of Absolute Minimal Acceptable Performance Levels for Multiple-Choice Examinations  

ERIC Educational Resources Information Center

Results of a study investigating the accuracy of absolute minimal performance levels for multiple choice examinations enhanced confidence in the validity of predetermined passing standards for the criterion referenced tests used by the schools of basic medical sciences at the University of Illinois. (JT)

Guerin, Robert O.; Smilansky, Jonathan

1976-01-01

497

Teaching of Formal Courses by Medical Librarians  

ERIC Educational Resources Information Center

Four courses on the use of the library are described which were taught by librarians at the University of Tennessee Center for Health Services to graduate students in basic medical sciences, dentistry, and pharmacy and undergraduates in medical records administration. Also included is a survey of medical libraries offering such courses. (JT)

Martin, Jess A.; And Others

1975-01-01

498

Models: Caveats, Reflections, and Suggestions  

ERIC Educational Resources Information Center

Noting that mathematical modeling is a relatively new phenomenon in higher education and that much can be learned from the misdirections and mistakes that characterize modeling in general, the author describes major criticisms of modeling and suggests improvements, particularly in communication between modelers and potential model users. (JT)

Kirschling, Wayne R.

1976-01-01

499

The Dataflow Visualization Pipeline as a Problem Solving Environment  

E-print Network

The Dataflow Visualization Pipeline as a Problem Solving Environment Helen Wrighty, Ken Brodliey and Martin Brownz ySchool of Computer Studies, University of Leeds, Leeds LS2 9JT, UK Email: helenw, kwb@scs.leeds.ac.uk zBritish Gas plc, Gas Research Centre, Ashby Road, Loughborough LE11 3QU, UK Email: martin

Brodlie, Ken

500

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

E-print Network

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