http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Z-Source Inverters, Controls, and Motor Drive Applications
Peng Fang Z.,Shen Miaosen,Joseph Alan The Korean Institute of Electrical Engineers 2005 KIEE International Transactions on Electrical Mach Vol.b5 No.1
This paper presents Z-source inverters, their controls,, and their systems for motor drives. System configurations, analysis, controls, and unique features of the new Z-source motor drive systems will be summarized and given. Simulation and experimental results demonstrate advantageous features over the traditional voltage- and current-source inverter systems.
DNA 분석을 통한 한우 , 연변황우 및 화우의 유전적 특성
신원집,여정수,김재우,신수길,정진우,이지홍 한국축산학회 1999 한국축산학회지 Vol.41 No.4
This study was conducted to identify the genetic parameters and genetic relationships among 3 cattle breeds of Hanwoo (Korea), Yanbian yellow cattle (China), and Wagyu (Japan). DNA fingerprinting was prepared using M13 probe and Pst 1 enzyme. Genetic homogencities of Hanwoo and Yanbian yellow cattle were comparatively lower than that of Wagyu, suggesting genetic improvement by active breeding program for Wagyu compared to Hanwoo and Yanbian yellow cattle and possibility of improvement capacity for Hanwoo and Yanbian yellow cattle. Genetic similarities between breeds were not significantly different among them, suggesting that these 3 breeds have been raised independently without any inflow or outflow of gene source for a while.
Passive Transient Voltage Suppression Devices for 42-Volt Automotive Electrical Systems
Shen, Z.John The Korean Institute of Power Electronics 2002 JOURNAL OF POWER ELECTRONICS Vol.2 No.3
New 42-volt automotive electrical systems can provide significant improvements in vehicle performance and fuel economy. It is crucial to provide protection against load dump and other overvoltage transients in 42-volt systems. While advanced active control techniques are generally considered capable of providing such protection, the use of passive transient voltage suppression (TVS) devices as a secondary or supplementary protection means can significantly improve design flexibility and reduce system costs. This paper examines the needs and options for passive TVS devices for 42-volt applications. The limitations of the commonly available automotive TVS devices, such as Zener diodes and metal oxide varistors (MOV), are analyzed and reviewed. A new TVS device concept, based on power MOSFET and thin-film polycrystalline silicon back-to-back diode technology, is proposed to provide a better control on the clamp voltage and meet the new 42-volt specification. Both experimental and modeling results are presented. Issues related to the temperature dependence and energy absorbing capability of the new TVS device are discussed in detail. It is concluded that the proposed TVS device provides a cost-effective solution for load dump protection in 42-volt systems.
Passive Transient Voltage Suppression Devices for 42-Volt Automotive Electrical Systems
Z. John Shen 전력전자학회 2002 JOURNAL OF POWER ELECTRONICS Vol.2 No.3
New 42-volt automotive electrical systems can provide significant improvements m vehicle performance and fuel economy It is crucial to provide protection against load dump and other overvoltage transients in 42-volt systems. While advanced active control techniques are generally considered capable of providing such protection, the use of passive transient voltage suppression (TVS) devices as a secondary or supplementary protection means can significantly improve design flexibility and reduce system costs This paper examines the needs and options for passive TVS devices for 42-volt applications The imitations of the commonly available automotive TVS devices, such as Zener diodes and metal oxide varistors (MOV), are analyzed and reviewed A new TVS device concept, based on power MOSFET and thm-film polycrystalline Silicon back-to-back diode technology, is proposed to provide a better control on the clamp voltage and meet the new 42-volt specification Both experimental and modeling results are presented Issues related to the temperature dependence and energy absorbing capability of the new TVS device are discussed in detaIl. It is concluded that the proposed TVS device provides a cost-effective solution for load dump protection m 42-volt systems.
Shen, G. Z.,Bando, Y.,Liu, B. D.,Golberg, D.,Lee, C.-J. WILEY-VCH Verlag 2006 Advanced functional materials Vol.16 No.3
<P>Vertically aligned ZnO nanonails and nanopencils are synthesized on a silicon substrate using a modified thermal-evaporation process, without using a catalyst or predeposited buffer layers. An adiabatic layer is used to provide an abrupt temperature decrease and high gas concentration for the nanostructures growth. The structure and morphology of the as-synthesized ZnO nanonails and nanopencils are characterized using X-ray diffraction, and scanning and transmission electron microscopies. Raman and photoluminescence properties are also investigated at room temperature. Field-emission characterization shows that the turn-on fields for the vertically aligned ZnO nanonails and nanopencils are 7.9 and 7.2 V &mgr;m<SUP>–1</SUP>, respectively.</P> <B>Graphic Abstract</B> <P>Vertically aligned ZnO nanonails and nanopencils (see Figure) are synthesized on a silicon substrate using a modified thermal-evaporation process, without a catalyst or predeposited buffer layer. An adiabatic layer is used to provide an abrupt temperature decrease and high gas concentration for the nanostructures' growth. <img src='wiley_img/1616301X-2006-16-3-ADFM200500571-content.gif' alt='wiley_img/1616301X-2006-16-3-ADFM200500571-content'> </P>
Shen, J.S.,Song, L.J.,Sun, H.Z.,Wang, B.,Chai, Z.,Chacher, B.,Liu, J.X. Asian Australasian Association of Animal Productio 2015 Animal Bioscience Vol.28 No.3
Twelve multiparous Holstein dairy cows in mid-lactation were selected for a replicated $4{\times}4$ Latin square design with a $2{\times}2$ factorial arrangement to investigate the effects of corn and soybean meal (SBM) types on rumen fermentation, N metabolism and lactation performance in dairy cows. Two types of corn (dry ground [DGC] and steam-flaked corn [SFC]) and two types of SBM (solvent-extracted and heat-treated SBM) with different ruminal degradation rates and extents were used to formulate four diets with the same basal ingredients. Each period lasted for 21 days, including 14 d for adaptation and 7 d for sample collection. Cows receiving SFC had a lower dry matter (DM) and total N intake than those fed DGC. However, the milk yield and milk protein yield were not influenced by the corn type, resulting in higher feed and N utilization efficiency in SFC-fed cows than those receiving DGC. Ruminal acetate concentrations was greater and total volatile fatty acids concentrations tended to be greater for cows receiving DGC relative to cows fed SFC, but milk fat content was not influenced by corn type. The SFC-fed cows had lower ruminal ammonia-N, less urea N in their blood and milk, and lower fecal N excretion than those on DGC. Compared with solvent-extracted SBM-fed cows, cows receiving heat-treated SBM had lower microbial protein yield in the rumen, but similar total tract apparent nutrient digestibility, N metabolism measurements, and productivity. Excessive supply of metabolizable protein in all diets may have caused the lack of difference in lactation performance between SBM types. Results of the present study indicated that increasing the energy degradability in the rumen could improve feed efficiency, and reduce environmental pollution.
A Review of the Development of Spatial Structures in China
Shen, S.Z.,Lan, T.T. Korean Association for Spatial Structures 2001 한국공간구조학회지 Vol.1 No.1
The development of contemporary spatial structures for long-span roofs in China was initiated in the 19505. Space trusses, reticulated shells and cable suspended structures have been developing rapidly since 1980s. Recently there has been a growing interest in tensile membrane structures. Comprehensive theoretical study has been carried out parallel to the engineering application, which provided necessary theoretical support to the development of different types of spatial structures.
Shen, T.Z.,Hong, S.H.,Song, J.K. Pergamon Press ; Elsevier Science Ltd 2014 Carbon Vol.80 No.-
The quality of aqueous graphene oxide (GO) dispersions relies partially on the centrifugal cleaning process in the Hummers method. As the number of centrifugal cleaning cycle increases, the concentration of the residual salts of oxidizing reagents decreases, and the exfoliation of graphite oxide into GO sheets is enhanced. We found that the electrical sensitivity of a GO dispersion in its electro-optic dynamics increases sharply with an increasing number of cleaning cycles. We discovered that the removal of the residual salts decreases the solvent conductivity, and the exfoliation increases the aspect ratio of GO particles, which are closely related to the anisotropic polarizability of GO particles and the electrical sensitivity.