检索结果-南通市图书馆

Design Study of Top Lid with Clamp Structure in JT-60sa Cryostat

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plasma Science and Technology 2013年第2期15卷 188-191页

作者： Shigetoshi NAk.MURA Yusuk. k. SHIBAMA k.i MAsak. Ak.ra.sa.a.a. Japan Atomic Energy Agency Mukouyama 801-1 Naka Ibaraki 311-0193 Japan

JT-60sa is a fully superconducting coil tok.mak.upgraded from the JT-60U. This paper focused on the integrity of the top lid of cryostat in JT-60sa. The design requirement for the cryostat in normal operations is to achieve vacuum insulation of 10-1 Pa, and the top flange of the top lid is lightly welded onto its body flange. The weld is tensile-loaded by bending deformation of the top lid due to vacuum pressure of external 0.1 MPa. This weld integrity is evaluated with tensile-load reduction, which results in clamp reinforcement. The structural integrity of the top lid is validated.

关键词： clamp vacuum insulation top lid cryostat JT-60sa

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

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2013年第2期15卷 184-187页

作者： k. SHIMADA T. TERAk.DO k. YAMAUCHI M. MATSUk.WA O. BAULAIGUE R. COLETTI A. COLETTI L. NOVELLO Japan Atomic Energy Agency 801-1 Mukoyama Naka Ibaraki 311-0193 Japan CEA IRFMF-13108 Saint-Paul-Lez-Durance France ENEA 1-00044 Frascati Rome Italy Fusion for Energy Boltzmannstr 2Garching 85748 Germany

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 reac- tive 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.

关键词： JT-60sa power supply poroidal field coil reactive power fluctuation asym-metric control PSCAD/EMTDC

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

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2013年第2期15卷 148-151页

作者： k. YAMAUCHI k. SHIMADA T. TERAk.DO M. MATSUk.WA R. COLETTI A. LAMPASI E. GAIO A. COLETTI L. NOVELLO Japan Atomic Energy Agency 801-1 Mukoyama Naka Ibaraki 311-0193 Japan ENEA 1-00044 Frascati Rome Italy Consorzio RFX Euratom-ENEA Association C.so Stati Uniti 4Padova Veneto 35127Italy Fusion for Energy Boltzmannstr 2Garching Bavaria 85748 Germany

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

关键词： JT-60sa power supply transient voltage snubber PSIM

Model based odia numeral recognition using fuzzy aggregated features

在线全文

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2014年第6期8卷 916-922页

作者： Tusar k.nti MISHRA Banshidhar MAJHI Pank.j k.sa sandeep PANDA Department of Computer Science and Engineering National Institute of Technology Rourkela 769008 India

In this paper, an efficient scheme for recognition of handwritten Odia numerals using hidden mark.v model （HMM） has been proposed. Three different feature vectors for each of the numeral is generated through a polygonal approximation of object contour. Subsequently, aggregated feature vector for each numeral is derived from these three primary feature vectors using a fuzzy inference system. The final feature vector is divided into three levels and interpreted as three different states for HMM. Ten different three-state ergodic hidden mark.v models （HMMs） are thus constructed corresponding to ten numeral classes and parameters are calculated from these models. For the recognition of a probe numeral, its log-lik.lihood against these models are computed to decide its class label. The proposed scheme is implemented on a dataset of 2500 handwritten samples and a recognition accuracy of 96.3% has been achieved. The scheme is compared with other competent schemes.

关键词： handwritten character recognition HMM pattern recognition Odia numeral OCR

On Newton’s Method for Solving Nonlinear Equations and Function Splitting

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Numerical Mathematics(Theory,Methods and Applications) 2011年第1期4卷 53-67页

作者： Ioannis k.Argyros saïd Hilout Cameron University Department of Mathematics SciencesLawtonOK 73505USA Universitéde Poitiers Laboratoire de Mathématiques et ApplicationsBd.Pierre et Marie CurieTéléport 2B.P.3017986962 Futuroscope Chasseneuil CedexFrance

We provided in[14]and[15]a semilocal convergence analysis for Newton’s method on a Banach space setting,by splitting the given *** this study,we improve the error bounds,order of convergence,and simplify the sufficie... 详细信息

关键词： Newton’s method Banach space majorizing sequence semilocal convergence splitting of an operator

Effect of strain rate and temperature on the serration behavior of sa508-Ⅲ RPV steel in the dynamic strain aging process

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2018年第7期25卷 767-775页

作者： Xue Bai Su-jun Wu Li-jun Wei Shuai Luo Xie Xie Peter k. Liaw School of Materials Science and Engineering Beihang University Beijing 100191 China Department of Materials Science and Engineering The University of Tennessee Knoxville TN 37996 USA Beijing k.y Laboratory of Advanced Nuclear Materials and Physics Beihang University Beijing 100191 China

Dynamic strain aging （Dsa） effect on sa508-III reactor pressure vessel （RPV） steel was investigated. The sa508-III RPV steel was subjected to tension tests at different strain rates （1.1× 10-5 s-1 and 6.6× 10-5 s-1） and different temperatures （500 and 550 ℃） to evaluate the influence of strain rate and temperature on the serrated flow behavior, which is the repetitive and discontinuous yielding phenomenon on the stress-strain curves. The higher temperature leads to the higher density of precipitates, M23C6 carbides and needle-lik. Mo2C carbides. It was found that the samples under tension test of 6.6 × 10-5 s-1 and 500 ℃ possess superior mechanical properties and mainly show A-type serrations on the tension test curves. Then, the local regress method was used to filter the Dsa curves, thus to show the real trend of the curves. It has been found that the less time of interaction between dislocations and precipitates under higher strain rates leads to a higher strength of the sample. The more tiny-stress drops on the 550 ℃ serration curve can be attributed to the hardening phase, M23C6 carbides and needle-lik. Mo2C carbides. The higher percentage of the small stress drops on the serration curves represents the higher mechanical strength.

关键词： Reactor pressure vessel steel sa508-Ⅲ steel Dynamic strain aging Serration behavior

Antihyperglycemic and antioxidant effects of Solanum xanthocarpum leaves(field grown & in vitro raised) extracts on alloxan induced diabetic rats

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2011年第10期4卷 778-785页

作者： k.Poongothai P Ponmurugan k.Syed Zameer Ahmed B Senthil k.mar sa Sheriff Research and Development Centre Bharathiar UniversityCoimbatore-646041Tamil NaduIndia Department of Biotechnology K.S.Rangasamy College of TechnologyK.S.R.KalvinagarThiruchengode-637215Tamil NaduIndia Department of Biotechnology K.S.Ranga.samy College of TechnologyK.S.R.KalvinagarThiruchengode-637215Tamil NaduIndia Department of Biochemistry C.Abdul Hakeem CollegeMelvisharam-632509Tamil NaduIndia Department of Zoology Thiruvalluvar UniversitySerkaduVelloreTamil NaduIndia Department of Biochemistry College of Applied Medical SciencesShaqra UniversityShaqra-11961.Kingdom of Saudi Arabia

Objective:To investigate antidiabetic efficacy of the extract of field grown and in vitro raised leaves of Solanum xanthocarpum(***) against alloxan induced diabetic rats. Methods:The antidiabetic activity of the crude methanol extracts of the field grown and in vitro raised leaves of *** at different concentrations(100-200 mg/k. bw) was tested against alloxan induced diabetic *** antidiabetic efficacy was validated through various biochemical parameters and the antioxidant effect was also *** phytochemical analyses of field grown *** and in vitro rasied *** leaves were done by estimating their chlorophyll,carotenoids,total sugar,protein,amino acid and minerals contents. Results:The results revealed that the methanol extracts of both the leaves(field grown and in vitro raised) of *** was efficient anti hyperglycemic agents at a concentration of 200 mg/k. bw and posses potent antioxidant ***,the extracts of in vitro rasied *** raised leaves exhibit higher efficacy than the field grown leaves in all tested *** composition and mineral analysis of *** revealed higher concentration of contents in in vitro rasied *** than field grown ***. Conclusions:From the results it can be concluded that the leaves extracts of *** can be a potential candidate in treating the hyperglycemic conditions and suits to be an agent to reduce oxidative stress.

关键词： Solanum Xanthocarpum Alloxan Field grown In vitro Oxidative stress Antioxidant Hyperglycemia Hypolipidemic

Effects of human disturbance on nest placement of the woodpigeon (Columba palumbus): a case study from the Middle Atlas, Morocco

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Integrative Zoology 2014年第3期9卷 349-359页

作者： saâd HANANE Forest Research Center High Commissariat for WaterForests and Desertification ControlRabat-AgdalMorocco

The woodpigeon(Columba palumbus)is a common and widespread bird in Morocco(North Africa).I examined,over 2 years(2010 and 2011),the breeding density and nest placement of this game species in relation to nest site habitat and degree of human *** study area was in the Middle Atlas Tighboula mountain forest,Morocco,in a disturbed and an undisturbed *** data collected in the 2 study sites,I aimed to identify the factors influencing the placement of nests within holm oak.trees(Quercus rotundifolia)and their densities.I found that habitat structures,influenced by grazing disturbance,have affected nesting density and the location of nests of this *** place their nests in a higher position(3.42±0.19 m)when disturbance intensity is high and lower(1.68±0.1 m)when disturbance intensity is low,and show higher nesting density in less disturbed zone(3.1±0.4 nests/ha)than in highly disturbed zones(1.4±0.2 nests/ha).Grazing disturbance could pose a threat to population persistence at a broader scale and could potentially reduce the abundance of this species by altering the composition and the structure of the forest nesting *** multi-scale studies are needed to assess the effects of different levels of grazing disturbance on woodpigeon nest density and placement,and to enhance our k.owledge of the breeding behavior of this game species under variable environments.

关键词： breeding density Columba palumbus holm oak Middle Atlas Morocco nest location woodpigeon

PYRIDINATION OF POLY(VINYL CHLORIDE) via A HOMOLYTIC PATHWAY

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2007年第3期25卷 297-302页

作者： sad Moulay Zak.a Zeffouni Laboratoire de Chimie-Physique Moléculaire et Macromoléculaire Faculté des Sciences de l'Ingénieur Département de Chimie IndustrielleUniversité Sad Dahlab de BlidaRoute de SoumaB. P. 270Blida 09000Algeria

PVC was subjected to a chemical modification aiming at replacing the chlorine atoms by pyridine groups via a homolytic route. Pyridine groups were peculiarly affixed to the PVC matrix via a carbon-carbon bond rather than a carbonnitrogen one. PVC was first iodinated using the Conant-Fink.lstein reaction, followed by the application of the homolytic conditions of Minisci to generate pyridinated PVC with a varying degree of substitution. The extent of substitution was not high; the reaction on 30% iodinated PVC afforded a degree of modification no greater than 3%.

关键词： Conditions of Minisci Iodinated PVC Pyridinated PVC