检索结果-南通市图书馆

On the Symmetry Classes of Functions

在线全文

学校读者我要写书评

暂无评论

wuhan university Journal of Natural {2.s 2005年第5期10卷 813-816页

作者： ZHU Ping~1,2. FAN Yun~3 1. School of Mathematics and Statistics, wuhan university, wuhan 430072. Hubei, china 2. School of science, Beijing university of Posts and Telecommunications, Beijing 100876, china 3. School of Mathematics and Statistics, huazhong Normal university, wuhan 430079, Hubei, china wuhan university School of Mathematics and Statistics Wuhan Hubei China (GRID:grid.49470.3e) (ISNI:***) Beijing university of Posts and Telecommunications School of Science Beijing China (GRID:grid.31880.32) huazhong Normal university School of Mathematics and Statistics Wuhan Hubei China (GRID:grid.411407.7) (ISNI:***)

Let R be an integral domain of characteristic zero such that the corresponding group rings have block decompositions. We first prove that the submodule consisting of all the R-valued ξi-symmetric functions of several variables is a symmetry class, where ξi is any block character. Then we present a relationship among certain operators introduced for block character. Then we present a relationship among certain operators introduced for block characters. As a consequence, we obtain a decomposition of an arbitrary R-valued function of several variables. Finally, we describe the symmetry property of such summands and determine all the symmetry classes.

关键词： symmetry class strict symmetry class blockcharacter ξi-symmetric function block idempotent

Preparation and ferroelectric properties of Bi_(3.4)Ce_(0.6)Ti_3O_(12. thin films grown by sol-gel method

在线全文

学校读者我要写书评

暂无评论

science china(Technological sciences) 2008年第1期51卷 10-15页

作者： GUO DongYun1, LI MeiYa1, LIU Jun1, YU BenFang1, PEI Ling1, WANG YunBo2. YU Jun2.& YANG Bin2.1 department of Physics, wuhan {2., wuhan 430072. china 2.department of Electronic science and technology, huazhong university of science and technology, wuhan 430074, china department of Physics Wuhan UniversityWuhan 430072China

We have investigated the preparation and properties of Bi3.4Ce0.6Ti3O12.thin films. The Bi3.4Ce0.6Ti3O12.thin films were fabricated on the Pt/Ti/SiO2.Si substrates using sol-gel method. The structure and morphology of the films were characterized us- ing X-ray diffraction and atomic force microscopy. The thin films showed a perovskite phase and dense microstructure. The dielectric constant and the dissi- pation factor of the Bi3.4Ce0.6Ti3O12.thin films were about 172.and 0.031 at 1 kHz, respectively. The 2.r and 2.c of the Bi3.4Ce0.6Ti3O12.thin films were 67.1 μC/cm2.and 2.9.7 kV/cm, respectively, under an applied field of 600 kV/cm. The Bi3.4Ce0.6Ti3O12.film did not show fatigue up to 4.46×109 switching cycles at a frequency of 1 MHz, and showed good insulating behavior according to the test of leakage current.

关键词： Bi3.4Ce0.6Ti3O12 thin film sol-gel method ferroelectric property dielectric fatigue leakage current

Positive Periodic Solution for a Nonautonomous Delay Differential Equation

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2003年第2期19卷 307-316页

作者： Bing Liudepartment of Mathematics, huazhong university of science and technology, {2. 430074, china department of Mathematics Huazhong University of Science and Technology Wuhan 430074 China

Abstract In this paper, by using the Krasnoselskii fixed point theorem, we study the existence of one or multiple positive periodic solutions of a nonautonomous delay differential equation. We also give some examples ... 详细信息

关键词： Positive periodic solution delay differential equation Krsnoselskii fix point theorem

Tissue P systems with cell separation: attacking the partition problem

在线全文

学校读者我要写书评

暂无评论

science china(Information sciences) 2011年第2期54卷 293-304页

作者： ZHANG XingYi1, WANG Shuo2. NIU YunYun2.& PAN LinQiang2.1Key Lab of Intelligent Computing and Signal Processing of Ministry of Education, School of Computer science and technology, Anhui {2., Hefei 2.0039, china 2.mage Processing and Intelligent Control Key Laboratory of Education Ministry of china, department of Control science and Engineering, huazhong university of science and technology, wuhan 430074, china 1. Key Lab of Intelligent Computing and Signal Processing of Ministry of Education School of Computer Science and Technology Anhui University Hefei 230039 China2. Image Processing and Intelligent Control Key Laboratory of Education Ministry of China Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China

Tissue P systems are distributed parallel and non-deterministic computing models in the framework of membrane computing, which are inspired by intercellular communication and cooperation between neurons. Recently, cell separation is introduced into tissue P systems, which enables systems to generate an exponential workspace in a polynomial time. In this work, the computational power of tissue P systems with cell separation is investigated. Specifically, a uniform family of tissue P systems with cell separation is constructed for effciently solving a well-known NP-complete problem, the partition problem.

关键词： membrane computing tissue P system cell separation partition problem

Multi-spectral image fusion method based on two channels non-separable wavelets

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

science in china(Series F) 2008年第12期51卷 2022-2032页

作者： LIU Bin1,2.& PENG JiaXiong3 1 School of Mathematics and Computer science, Hubei university, {2. 430062. china 2.Key Laboratory of Applied Mathematics of Hubei Province, {2. 430062. china 3 Institute of Image Recognition and Artificial Intelligence, huazhong university of science and technology, {2. 430074, china 1. School of Mathematics and Computer science Hubei University Wuhan 430062 China 2. Key Laboratory of Applied Mathematics of Hubei Province Wuhan 430062 China 3. Institute of Image Recognition and Artificial Intelligence Huazhong University of Science and Technology Wuhan 430074 China

A construction method of two channels non-separable wavelets filter bank which dilation matrix is [1, 1; 1,-1] and its application in the fusion of multi-spectral image are presented. Many 4×4 filter banks are designed. The multi-spectral image fusion algorithm based on this kind of wavelet is proposed. Using this filter bank, multi-resolution wavelet decomposition of the intensity of multi-spectral image and panchromatic image is performed, and the two low-frequency components of the intensity and the panchromatic image are merged by using a tradeoff parameter. The experiment results show that this method is good in the preservation of spectral quality and high spatial resolution information. Its performance in preserving spectral quality and high spatial information is better than the fusion method based on DWFT and IHS. When the parameter t is closed to 1, the fused image can obtain rich spectral information from the original MS image. The amount of computation reduced to only half of the fusion method based on four channels wavelet transform.

关键词： image fusion non-separable wavelets multi-spectral image panchromatic image

3-D Lightning Location Solution and Precision Analysis of Cloud Flash

在线全文

学校读者我要写书评

暂无评论

wuhan university Journal of Natural {2.s 2009年第3期14卷 241-244页

作者： ZHANG Ping1,2. ZHAO Wenguang2.3?, HU Zhixiang2.3, WEN Yinping2.3 1. School of Architecture and Urban Planning, huazhong university of science and technology, wuhan 430074, Hubei, {2. 2. School of Civil Engineering and Mechanics, huazhong university of science and technology, wuhan 430074, Hubei, {2. 3. Hubei Key Laboratory of Control Structure, huazhong university of science and technology, wuhan 430074, Hubei, {2. School of Architecture and Urban Planning Huazhong University of Science and Technology Wuhan 430074 Hubei China School of Civil Engineering and Mechanics Huazhong University of Science and Technology Wuhan 430074 Hubei China Hubei Key Laboratory of Control Structure Huazhong University of Science and Technology Wuhan 430074 Hubei China

Using the spatial coordinates of detection stations and the time of arrival of lightning wave, the observation equations can be expressed. For the large lightning detection network, the least square method is used to process the adjustment of observation data to find the most probable value of lightning position, and the result is assessed by the mean error and dilution of precision. Lightning location precision is affected by figure factor. The conclusion can be used in the design of location network, data processing, and data analysis.

关键词： 3-D lightning location cloud flash detection solution model dilution of precision figure factor

Output Rate of Atomic Four-Wave Mixing in Two-Component Bose-Einstein Condensate

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2004年第5期41卷 695-698页

作者： LI Jia-Hua~1 LI Wei-Bing~1 PENG Ju-Cun~2.1 department of Physics,huazhong university of science and technology,{2. 430074,china2.department of Physics,Xiaogan Normal university,Xiaogan 432.00,china department of Physics Xiaogan Normal University Xiaogan 432100 China

In this letter,following the proposal of Heurich et al.[***.A63(2.01)033605],we analyze anddiscuss output rate of atomic four-wave mixing in the two-component Bose-Einstein condensate under the condition ofthe steady *** results show that the magnitude of the signal beam increases with the increase of the intensityof the probe beam,up to a saturated value,then it decreases as the probe beam *** influence of theinteraction range on the signal beam is also *** particular,it is worth while pointing out that in contrast tothe previous solutions,our obtained analytical solutions are of very simple and explicit forms,which open the door forfurther investigating the related physical mechanisms.

关键词： atomic four-wave mixing steady state Bose-Einstein condensate

Inosine inhibits apoptosis and cytochrome C mRNA expression in rat neurons after cerebral ischemia/reperfusion

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2006年第7期1卷 589-592页

作者： Jinrong Wang1, Mingjun Bi1, Qin Li2.1department of Neurology, Rongcheng Second People’s hospital, Rongcheng 2.4309, Shandong Province, {2. 2.0} of Neurology, Affiliated union hospital, Tongji Medical College, huazhong university of science and technology, wuhan 430030, Hubei Province, {2. department of Neurology Rongcheng Second People's Hospital Rongcheng 264309 Shandong Province China department of Neurology Union Hospital Huazhong University of Science ad Technology Wuhan 430030 Hubei Province China

BACKGROUND: It has been demonstrated that adenosine can induce glial cell to release cytochrome C, enhance expression of apoptotic gene bax, inhibit anti-apoptotic gene bcl-2. and activate caspase-3 to apoptosis; Whereas inosine can inhibit neuronal apoptosis which is similar to bcl-2. OBJECTIVE: To observe the effects of inosine on neuronal apoptosis and expression of cytochrome C mRNA in rats after focal cerebral ischemia/reperfusion, and analyze the pathway of its neuroprotective effect. DESIGN: A randomised controlled animal trial. SETTINGS: department of Neurology, Rongcheng Second People's hospital; department of Neurology, Affiliated union hospital, Tongji Medical College, huazhong university of science and technology. MATERIALS: Sixty-eight rats, weighing 2.0-2.0 g and clean grade, were used. TdT-mediated dUTP-biotin nick end labeling (TUNEL) and cytochrome C mRNA in situ hybridization kits and DAB staining kit were purchased from wuhan Boster Biological Co., Ltd.; Inosine injection [2.0 mg (2.mL) each] from Qingdao First Pharmaceutical Factory. METHODS: The experiment was accomplished in the animal experimental center in Tongji Medical College of huazhong university of science and technology from December 2.03 to June 2.05. ① Sixty-four rats were made into focal ischemia by middle cerebral artery occlusion (MCAO) with a nylon monofilament suture. The successfully induced rats were assigned to inosine group (n =32. and model group (n =32. at random. Rats in the inosine group were intraperitoneally administrated with inosine in dose of 100 mg/kg preoperatively, twice a day, 7 days in all. The rats in the control group were injected with the same dose of saline solution by the similar way preoperatively. Each group was randomized into ischemia /reperfusion 2. 6, 12. 2. hours, 2. 3, 7 and 14 days subgroups consisted of 4 rats. The other 4 rats were taken as the sham-operated group, the rats were given the same treatment except for not introduced the filament in

关键词： mRNA Inosine inhibits apoptosis and cytochrome C mRNA expression in rat neurons after cerebral ischemia/reperfusion

An Automatic Testing System of Scheduling Strategies in Real-Time UNIX

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2001年第2期12卷 59-62页

作者： Qin Xiao, Pang Liping & Han Zongfen department of Computer science, {2., wuhan 430074, P. R. china department of Computer science Huazhong University of Science and Technology Wuhan 430074 P. R. China

This paper proposes a formal model of the automatic testing system for scheduling strategies in real-time UNIX and describes the algorithm of the key part of the system. The model of the system is an important technology of the automatization of software development. According to the model presented in the paper, many different kinds of automatic testing systems can be designed and developed easily. At the end of the paper, the prototype proves the feasibility of the model and design.

关键词： Algorithms Automatic testing Real time systems Scheduling Software prototyping