Synthetic Application for Analysis Methods of the Planar Mechanism Overconstraints     

AN Pei wen  HUANG Mao lin 《保鲜与加工》2002,(5):21-24

Overconstraints exist widely in planar closed chain mechanisms and mechanical systems result in a series of detrimental influences on behavior of machines, and attention is given to them by machine designer. Some analysis methods of overconstraints in planar closed chain mechanisms are presented, and more study due to the faultiness of these methods. In accordance with faultiness of two common kind of methods, formulas method and loop analysis method of degrees of freedom, and by combining these two methods, an useful mechanism overconstraints analysis method which is convenient for computer aided overconstraints analysis is gained via research on the two methods thoroughly and systematically, and some new views about mechanism overconstraints analysis are presented.  相似文献   

Noise and Interference in Two Way CATV     

ZENG Xi hu  ZHOU Jian 《保鲜与加工》2001,(5):55-58

The funneling effect of noise is the main difficulty in two way CATV modification works. This paper discusses the source of noise and interference, the mechanism to form noise funneling, the regularities of distribution, the characteristics of the spectrum, etc. The purpose is to find the way of reducing funnel noise. The invading noise has the greatest effect on the upstream of two way CATV system, which mainly comes from the indoor of the users. The increase of the number of cable modem will not obviously make greater funneling noise. The cable connectors are the main source of producing and invading noise in outdoor cable network, which is a threat to the safty of the whole upstream channel.  相似文献   

Model of Information Integrating in CIMS Based on the Object-oriented Method     

HUANG Min  HUANG Xi yue  MA Xiao xiao  NI Lin 《保鲜与加工》2002,(4):51-54

Information integrating is the most important key to CIMS,which is the base of the function integrating and all others.Because of so many kinds,so complicated structure,so many different sources and uses that the information in CIMS has,it is necessary to build a popular Information Integrating Model. The model of information integrating in the thesis bases on the enterprise model,which is presented by ISO(International Organization for Standardization).According to the object-oriented method,the process of modeling begins with classifying the information,and then describes the definition of the attributes and the structural relation of those objects. By means of the idea of Encapsulation and Inheritance,the destination of information integrating can be arrive and the model of information integrating can be set up. The model which is based on the share information is helpful to finish the function integrating and the whole CIMS' construction. Moreover,the system which is developed following such program can be reused for many times and the developing circle of CIMS can be apparently shortened,too.  相似文献   

EXPERIMENTAL RESEARCH ON VISCOELASTICITY OF HUMAN BLOOD- WITH REFERENCE TO THE EFFECT OF CELL HEMOTOCRIT     

Cai Shaoxi Wu Xi Xiao Jun Liu Yanhai Wu Yunpeng 《保鲜与加工》1992,(3):15-18

This paper describes a part of the experiments concerning the viscoelasticity of human blood, which are based upon the theories lead by the authors. The data from the experiments are compared with those in the literatures. The effect of cell hematocrit on viscoelasticity is especially discussed and a new viscoelasticity index is defined to eliminate this effect.  相似文献   

A Research on the Way of EMBET in the Tracking Systems'' Accuracy-analysis During Satellite Launch     

GAO Bo  HUANG Xi yue  YU Wang qing  CHE Zhu ming 《保鲜与加工》2002,(1):88-91

In the past, the criterion for calibration has almost invariably been the stellar oriented ballistic camera,the method is a point to point comparison on the identical coordinate system. Deficiencies is follows: The request of weather is severe(cloudless night); The period is often long; the measure equipment of high precision can't be calibrated. While EMBET methods is used in calibration, it does not need criterion and it demands only that the measure elements is larger than 3,and the trajectory and many system errors of the measure elements can be simultaneously calculated with the measure data sequences. The error models of related equipments' measure elements and the EMBET of typical equipment group are given. The EMBET method is successfully used in Accuracy-analysis of Satellite Launch.  相似文献   

Automatic Fingerprint Classification by GA-Based Neural Network     

HUANG Xi yue  MA Xiao xiao  SHEN Zhi xi  WANG Peng  ZHOU Xin 《保鲜与加工》2001,(1):74-77

Fingerprint classification can provide an important indexing mechanism in a fingerprint database. An accurate and consistent classification can greatly reduce fingerprint matching time for large database. In the paper, by combining genetic algorithm and neural network is presented a fingerprint classification algorithm which is able to achieve an accurate classification. By inputting the global feature represented by directional image to three layer neural network trained by genetic algorithm, the fingerprints were classified into six categories: whorl, right loop, left loop, arch, double loop and undiscerning type successfully.  相似文献   

Two-dimensional Optimum Cutting Stock Method Based on Internet and Its Implementing Technique     

YAN Chun ping  LIU Fei  Liu Xi gang 《保鲜与加工》2001,(5):1-4

Two dimensional Optimum Cutting Stock is a NP complicated problem. Each of optimum software gets the cutting results by using proximate and heuristic methods. But different optimum methods and their optimum software may not realize perfect effect according to certain data framework. Furthermore, enterprises can not buy lots of optimum software to choose the most optimized plan. Because of such problems, this paper provides a two dimensional optimum cutting stock method based on Internet and offers the real implementing technique of such method. The experiments, show that this method promotes the general optimum effect of two dimensional optimum cutting stock greatly.  相似文献   

Internet Telerobotics and Its Applications     

HUANG Xi yue  MA Li bo  HE Chuan jiang  CHEN Dong yi 《保鲜与加工》2002,(9):50-54

According to a new trend of telerobot control, some key techniues are researched to solve the Internet telerobotics , such as distributed intelligent computation on the Internet, human-computer interface,and Internet-robot interface etc.The current development status of the Internet telerobotics is reviewed. Based on the new directions of the network software development, the authors discuss that the middleware technique CORBA plays an important role in solving the problems of the Internet telerobotics,and it is an effective way to use Java language to control the telerobot and improve its system performance. The application perspective of the Internet telerobotics is investigated.It is indicated that the development trend of the telerobot control is a human-centred collaboration mechanism of mutual reinforce and coordination in human-machine intelligent.  相似文献   

谈秸秆气化的应用与发展动态     

张赛仕  王曦 《当代农机》2007,(2):54-55

指出秸秆气化是农村废弃资源综合利用领域中的一项重要技术,介绍了秸秆气化在国内发展动态和气化模式,提出了促进秸秆气化工作顺利开展的措施。  相似文献   

阜新县节水农业分区研究   总被引：1，自引：0，他引：1  

商艾华  郭维东  黄毅  杨建青  安禹 《节水灌溉》2006,(3):13-15,20

针对阜新县水资源紧缺的现状，在综合分析全县气候、土壤、水资源现状、农业种植制度和经济发展水平等因素的基础上，对阜新县节水型农业分区进行了研究，为确保分区指标的科学性、系统性，采用模糊数学聚类分析方法，探讨节水农业的地域分布规律，进行节水农业分区，以阜新县为例对因地制宜地发展东北半干旱地区的节水农业分区进行有益的探索。  相似文献