检索结果-南通市图书馆

ANALYSIS OF THE MODES OF COLLABORATIVE DESIGN AND SYSTEM IMPLEMENTATION

在线全文

cnki会议

学校读者我要写书评

暂无评论

ANALYSIS OF THE MODES OF COLLABORATIVE DESIGN AND SYSTEM IMP...

2006年中国机械工程学会年会暨中国工程院机械与运载工程学部首届年会

作者： GAO Qi*, DU Zongzhan *school of Mechanical engineering, shandong university, Jinan 250061, china school of electrical engineering, shandong university, Jinan 250061, china

As the complexity and variety of products increase to satisfy increasingly sophisticated customers, modern product development is performed by cross-functional teams distributed geographically and tem

关键词： Collaborative design collaboration model project management workflow management.

electronic structure and magnetic properties of SmCo7-xTix

在线全文

cnki会议

学校读者我要写书评

暂无评论

Science china(Physics,Mechanics & Astronomy) 2006年第1期49卷 38-45页

作者： ZHANG Changwen1, LI Hua1, DONG Jianmin1, GUO Yongquan2 & LI Wei2 1. school of Physics and Microelectronics, shandong university, Jinan 250100, china 2. Institute of Functional Materials, Central Iron and Steel Research Institute, Beijing 100081, china school of Physics and Microelectronics Shandong University Jinan China Institute of Functional Materials Central Iron and Steel Research Institute Beijing China

electronic structure of SmCo7-xTix alloy has been studied by means of the spin-polarized MS-Xα method. It is shown that a few of electrons are transferred to Sm(5d) orbital due to orbital hybridization between Sm and Co atoms. The exchange interaction between 5d-3d electrons is stronger, which is the main reason resulting in the long-range ferromagnetic order between Co and Sm atoms. The Curie temperature of SmCo7-xTix is generally lower than that of pure Co metal, which may be explained by the weaker aver- age of coupling strength between Co sites due to some negative exchange couplings occurring mainly at 2e site. The calculated results for the Sm5Co28Ti6 cluster may lead to a better understanding of why SmCo7-xTix is stable phase. Since the negative interaction of 2e sites weakens and the bonding at EF strengthens with increasing Ti concentration, which result in the decrease in the free energy of the alloy, the stable ferromagnetic order forms inside SmCo7-xTix. Considering the localization of 4f states and 5d moment arising from the orbital hybridization, the calculated moment is 9.47μB per formula unit that is in agreement with experiments.

关键词： electronic structure, spin polarization, atomic magnetic moment, exchange coupling, Curie temperature.

在线全文

学校读者我要写书评

暂无评论

风电互补恒压供水系统控制器的设计

水电能源科学 2011年第7期29卷 139-141页

作者：齐保良杨宝昆山东建筑大学信息与电气工程学院山东济南250101 山东建筑大学机电工程学院山东济南250101

为降低恒压供水系统的耗电量,将风能作为辅助动力源,通过PLC控制器,采用模糊控制技术设计了一种风电互补恒压供水系统。当风力机驱动泵供水量充足时,PLC调节电动调节阀以控制风力供水支路的流量,使管网压力保持于设定范围内;当风力供水... 详细信息

为降低恒压供水系统的耗电量,将风能作为辅助动力源,通过PLC控制器,采用模糊控制技术设计了一种风电互补恒压供水系统。当风力机驱动泵供水量充足时,PLC调节电动调节阀以控制风力供水支路的流量,使管网压力保持于设定范围内;当风力供水不足时,PLC调节电动调节阀使风力供水支路的扬程达到设定值。同时,PLC通过变频调速方式,调节电动泵的转速以补充系统所需,实现了风力自动投入以减少电力消耗的目的。

关键词：风电互补恒压供水系统模糊控制 PLC

Morphology and electrical conductivity of PACS

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2000年第3期12卷 319-324页

作者： GAO Bao\|yu\+1, LIU Zong\|gang\+2, YUE Qin\|yan\+3, ZHAO Hua\|zhang\+3 (1. Department of Environmental engineering, shandong university, Jinan 250100, china 2. Environmental Monitoring Station of Huaiyin, Jinan 250022, china 3. Department of Environ 山东大学山东济南 2 50 1 0 0 山东济南市槐荫区环境监测山东济南 2 50 0 2 2

Polyaluminium chlorides with sulfate ion(PACS) were prepared by using AlCl 3·6H 2O, Al(SO 4) 3·18H 2O and Na 2CO 3 as raw materials. The effects of basicity ( r ), Al 3+ /SO 4 2- molar ratio and aging time on the morphology of PACS were observed by transmission electrical microscope. The influence of aging time on charge neutralization and coagulation effect of PACS was studied. The effects of basicity ( r ), Al 3+ /SO 4 2- molar ratio and aging time on the electrical conductivity of PACS solution were also investigated. The experimental results show that the degree of polymerization of polyaluminium chloride(PAC) increases when SO 4 2- ion is added. The higher the basicity( r ) and the longer the aging time, the larger the size of polymer PACS. The ability of PACS neutralizing the charge on Kaolinite decreases with the increase of aging time. The electrical conductivity of PACS solution(the concentration of Al 3+ ion is 0.18 mol/L) with different aging time is the function of the basicity and Al 3+ /SO 4 2- molar ratios and has its maximum at r =0.5 and Al 3+ /SO 4 2- =12.

关键词： coagulant PACS morphology transmission electron microscope electrical conductivity coagulation

A Neural-based L1-Norm Optimization Approach for Fault Diagnosis of Nonlinear Resistive Circuits

在线全文

学校读者我要写书评

暂无评论

湖南大学学报（自然科学版） 2000年第S2期27卷 143-147页

作者： Yigang He school of electrical & Information engineering, Hunan Univ,Changsha 410082,P.R.china Yichuang Sun Department of electronic,Communication & electrical engineering,Faculty of engineering and Information Sciences,university of Hertfordshire,Hatfie

This paper deals with fault isolation in nonlinear analog circuits with tolerance under an insufficient number of independent voltage measurements.A neural network-based L1-norm optimization approach is proposed and utilized in locating the most likely faulty elements in nonlinear *** validity of the proposed method is verified by both extensive computer simulations and practical *** simulation example is presented in the paper.

关键词： Fault diagnosis Neural networks Optimization methods Nonlinear circuits Anlog circuits

Toward high-performance two-dimensional black phosphorus electronic and optoelectronic devices

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2017年第3期26卷 137-147页

作者：李学飞熊雄吴燕庆 Wuhan National High Magnetic Field Center and school of electrical and electronic engineering Huazhong University of Science and Technology Wuhan 430074 China Wuhan National High Magnetic Field Center and school of Optical and electronic Information Huazhong University of Science and Technology Wuhan 430074 China

Recently, black phosphorus （BP） has joined the two-dimensional material family as a promising candidate for elec- tronic and photonic applications due to its moderate bandgap, high carrier mobility, and unusual in-plane anisotropy. Here, we review recent progress in BP-based devices, such as field-effect transistors, contact resistance, quantum transport, stabil- ity, photodetector, heterostructure, and in-plane anisotropy. We also give our perspectives on future BP research directions.

关键词： black phosphorus transistors mobility photodetector

有限波长转换能力光突发交换网络动态波长分配机制

在线全文

学校读者我要写书评

暂无评论

上海交通大学学报 2009年第3期43卷 355-360页

作者：许毅范戈上海交通大学电子信息与电气工程学院上海200240

为了解决下一代可商用化的有限波长转换能力光突发交换(OBS-LWCC)网中突发包资源竞争问题,根据波长转换器所在的位置分布,将整个网络解构为多个波长连续性子段.基于分解后的网络模型,对各种波长分配算法的突发阻塞性能进行分析和综合比... 详细信息

为了解决下一代可商用化的有限波长转换能力光突发交换(OBS-LWCC)网中突发包资源竞争问题,根据波长转换器所在的位置分布,将整个网络解构为多个波长连续性子段.基于分解后的网络模型,对各种波长分配算法的突发阻塞性能进行分析和综合比较,采用传统优先级计算与子段模型结构相结合的方法,提出一种新的分布式动态波长分配策略PWA-leg.仿真实验表明,在OBS-LWCC网络结构中关键的波长可转换节点处,该算法实现了突发业务最佳承载波长(信道)的智能选择,与传统波长分配算法相比,具有更低的全网突发包阻塞率,能够更好地适应动态突发包业务和网络拓扑的变化.

关键词：光突发交换波长转换波长连续性限制突发竞争波长分配

The Application of FBD Current Examination Method in the Three-phase Power System

在线全文

学校读者我要写书评

暂无评论

The Application of FBD Current Examination Method in the Thr...

第二十七届中国控制会议

作者： Cheng Qiong 1,Zheng Jianyong 2 1.school of electrical & electronic engineering,Hubei university of Technology,Wuhan 430068,P.R.china 2.school of electrical engineering,Southeast university,Nanjing 210096,P.R.china

In three-phase electrical power system,in order to compensate and control the harmonic current and the reactive power more effectively,this paper proposed a electric current testing method which is based on the method of *** method can be used to detecting the fundamental wave’s negative sequence current,the fundamental wave’s zero-sequence current,the harmonic current and so *** FBD mehod,compared with the other electric current testing method based on the instant reactive power theory,is more useful in the same *** result of PSCAD simulation has indicated the validity and the accuracy of this electric current testing method.

关键词： FBD method Current examination Harmonic current Reactive current

The Keying Identification Based on Fuzzy Clustering and Improved BP Network

在线全文

cnki会议

学校读者我要写书评

暂无评论

The Keying Identification Based on Fuzzy Clustering and Impr...

2010 Second ETP/IITA World Congress in Applied Computing, Computer Science, and Computer engineering(ACC 2010)

作者： Lanlan Yu school of Electric and electronic engineering shandong university of Technology school of Electric and electronic engineering, shandong university of Technology, 255049 Zibo, china

The Brain-computer Interface (BCI) systems based on EEG can control machines or express thoughts through brain directly. Feature classification is an important aspect in research for BCI. In this paper, we use the fuzzy clustering technology and improved BP network to identify the left-right finger keying. At first we do fuzzy clustering disposal for the multi-channel electroencephalogram (EEG) during finger keying. Then we classify the feature extracted from EEG based on common spatial subspace decomposition (CSSD) algorithm with the improved BP network. The averaged classification accuracy achieves 95.23% in the course of testing on the data from three subjects. Experiment results show that the combination of fuzzy clustering and neural network can greatly improve the rate of identification for finger keying.

关键词： fuzzy clustering, improved BP network , keying identification