Pathway Analysis of the Mountainous Characteristic Road Network for Emergency Evacuation

According to conditions of landform in mountain area and features of mountainous road network, a concept of mountainous characteristic I Shaped road network was presented. By adopting time cost analysis method, finite impact ranges of key pathway and its adjoining pathway surrounding road networks were defined. Using graph theory and fluid network theory, the analysis of pathways to mountainous characteristic I Shaped road network was carried out. With the ways of virtual node and virtual branch, pathway algorithm of mountainous characteristic I Shaped road network was provided. The calculated process of the analysis of pathways to mountainous characteristic I Shaped road network was illustrated through numerical example, which shows that it provides guidance for determining an optimal route to evacuation and evacuation management in the calamity events.     

地震时城市供水管网连通可靠性分析

在分析地震条件下管线功能函数及极限状态方程基础上,对城市供水管单元体进行震害预测。以供水管网系统作为边权的有向网络图,通过基于神经网络的Monte Carlo方法,模拟各管线运行状态及其破坏状态。结合图论理论,分析供水管网的管线连通可靠性。     

Study on Application Model of Knowledge Expression

As a key resource, the knowledge management is becoming a research field interested by many researchers. In order to study the mathematics theory base of knowledge expression, in this paper, a knowledge expression model is given. In this model the knowledge system is expressed by multi-tuple, the single knowledge object is expressed by the tuple, a structural expression of knowledge is given using token as example and the application of the model in city water supply pipe network is presented in this paper.     

Heat Transfer Model and Application of Buried Tube Heat Exchanger for Ground Source Heat Pump

This paper introduces the theoretical basis and application method for heat transfer model of buried tube (pipe in pipe and U- type) heat exchanger for ground source heat pump, and a practical example is calculated. Then, the calculation results are analyzed and discussed. In particular, the correlation coefficient and calculation method of tube group exchanger is discussed; the method for determining known parameter and some basic data for main procedure GSHP.HTM is analyzed. The calculation formula and data sampling for JSW.HTM subroutine is introduced. At last, the problems in application of calculation procedure, to which should pay attention, are discussed.     

Water Supply and Drainage Design of Residential Building

This paper sums up the current situation of water supply and drainage designs of residential building. In accordance with the owner's demands, the problems related to the installation of water meter and water heater, the layout of pipeline, selection of pipe material and engineering measures are discussed respectively. It also points out some problems existed and inquires into the water system design for residential houses in the future.     

THE OPTIMAL DESIGN AND ENGINEERING APPLICATION OF DISTRIBUTION

This paper introduces the metod of optimal design of municipal water distribution,The main points are the theory,mathematical model,program frame figure and example in practice of the optimal method of hydraulics.The program is applicable to the design and calculation of the pipe network in a city. It gives a simple and convenient calculation method for multiple-scheme design and scheme cmparison of water supply system.     

基于网络DEA的农产品供应链综合评价方法研究

为了促进农产品生产资源配置合理化、提高农产品供应链整体运行效率,对农产品供应链进行了综合评价分析。针对传统DEA方法忽略了供应链内在结构机理等问题,提出了基于网络DEA(Network DEA-NDEA)的供应链综合效率评价模型,并对2010—2012年黑龙江省各地区的农业生产现状进行实证分析和模型应用。结果表明：相比传统DEA方法,网络DEA对有效性的要求更高,能够给出更多的信息,评价结果更加合理。该评价模型更符合供应链网络结构特点及个体间相互协作关系,能够分析供应链内部结构中效率低下的具体环节,为优化资源配置、提高整体运行效率提供科学的依据和决策参考,提高评价的有效性和可靠性。     

THE APPLICATIONS OF GRAPH THEORY IN STRUCTURE MECHANICS

This paper presents some ideas of graph theory which are led int(?) structural matrix analysis. The main contents of this paper are the principal points of the graph theory, the computative principles of the node method and the mesh method.     

ALYSTS OF THREE-FLUID SEPARATE TYPE HEAT PIPE EXCHANGER

An analytical model for the separate type heat pipe exchanger with three different fluids is presented. A univeral basic temperature transfer matrix equation can be applied to predict the heat transfer performance of parallel-or counter-flow in which heat is transfered between one hot fluid and two cold fluids or between two hot fluids and one cold fluid. The calculation of a real engineering example proves the proposal model to be reliable.     

Discussion on Some Problems Concerning the Building Hot Water Supply System

The problems concerning the patterns of hot water supply and heating equipment, hot water storage equipment volume, water quality and pipe material were studied in this paper. Then, on this basis, the solution for optimizing building hot water supply system was proposed.     

OPTIMIZATION OF BIPARTITE JOINS WITH GRAPH THGORY

An optimization approach for multi-relational joins based on the matching concept in graph theory is introduced. The basic idea lies in constructing a join graph from an expression of N-relation query, and seeking for a maximun matching with minimun total weight. The algorithm for bipartition(X, Y) is proposed in this paper.     

Leak Current Fault Diagnosis Problem-Solving in Launch Vihicle Controlling System

In point of view of the system, the characteristic of leak current fault diagnosis in launch vehicle controlling system is analyzed. It is presented that the fault is a connecting way for sytem factors. By building some basic concepts such as componts, syptoms, observation and faults, the system model is turned into graph, where nodes represent components and edges represent fault transmission among components. Besides,designing rule, that is, bisection rule for diagnosing alglorithm is given based on the information theory. Operating feasibility and entropy function characteristic are analyzed using component trade-off value to substitute component entropy, giving fault problem-solving way based on the drawing model.     

Investigation on the Pressure Head of Water Supply System with Head Tank

The water supply system with pump-head tank joint water supply is a mature technology widely used in high-rise buildings. In recent years, with widespread of new type pipe material and decoration of buildings, there is insufficient pressure head of water supplied at top floors in high-rise buildings. In this paper from the experience in engineering practice the reason for this problem and its countermeasures are investigated, then some suggestions are given.     

A Method for State Diagnosis of Grounding Grid

This paper discuses the method with which the corrosion of the grounding grid can be diagnosed .A grounding grid can handled as a circuit network. With the application of circuit network graph theory and the fault diagnosis theory of analog circuit and optimization, the fault diagnosis equations can be set up. This equations is figured out by Matlab, and the corrosion status of the grounding grid can be deduced from the result.     

农民科技培训的培训模式分析

将重点从农民科技培训提供主体的角度,介绍和分析目前存在的一些重要的农民科技培训模式,包括各种模式的基本构成和基本运作情况,以及各种模式的效应分析。总结各种模式优势和不足,并为各种培训方式产生的问题提出独到的见解。以此为农民科技培训问题提供研究平台,促进农民科学文化素质的提高。     

A SFG METHOD FOR RELIABILITY EVALUATION OF HVDC SYSTEMS

Steady-state probability, frequency and duration are the three main indices in reliability evaluation of the HVDC systems. Generally, they are solved by numerical methods. Their topolgical formulaes are derived by using the basic theory of ccates graph and considering conditions for some particularity of state-space in this paper. A set of generalised formulaes can be applied to obtain these indices expression about reliability parameters of components. Finally,an example is given to illustrate and verify this method.     

Validitv of the information sharing in cyber supply Chain

The application of supply chain bring us some questions which need to be solved immediately. Bullwhip effect is one of these. We can lighten bullwhip effect through information sharing. The enterprises in SC need long, balance relationship. From Game Theory, the relationship could get. Through the stock information sharing cost analysis of two-stage SC against no sharing, the information sharing is not only need but also efficiency. The core enterprise in SC should use the Principal-agent theory to pursue information sharing with other enterprises.     

福建农业电子商务发展模式研究

介绍了农业电子商务的两种基本的发展模式;进而说明福建当前实施农业电子商务的主要运营模式,并通过对福建农业信息网上农产品的供求信息配对率和点击率统计分析得出两个结论,即福建农业电子商务发展相对滞后和农产品的供求信息配对率跟点击率之间是不相关的关系;最后,文章根据统计分析的结果对福建农业电子商务的发展前景进行预测。     

面向协作定价的上海蔬菜供应链整合研究

通过对上海地区蔬菜供应链结构的调研,分析了几种典型蔬菜供应链结构的优势和存在的问题。以批发市场占主导的上海蔬菜供应链为例,从供应链整合中最核心的协作定价策略出发,运用二层规划模型对该供应链进行协作定价的决策分析,以期确定能实现供应链整体收益和各主体收益稳定增长的合理价格,并提出了能保护农民和市民利益的理想蔬菜供应链结构。     

网络环境下新生代大学生心理情感影响研究

为了研究网络对新生代大学生心理情感的影响,通过调查并对比分析网络对新生代大学生心理情感的影响,充分发挥网络在培养新生代大学生心理情感方面的优势,以促进新生代大学生人格和素质的全面提升。有助于揭示学习过程中情感因素发展与网络技术影响的基本规律,确立学习中情感发展倾向的相关理论。