基于最大可支撑人口的水资源量承载能力分析

提出评价水资源承载能力的指标体系和一种基于最大可支撑人口的水资源承载能力分析模型,通过分析水资源可利用量、生态和环境需水量、人均生活和GDP需耗水量,可以获得区域最大可支撑人口数量,进一步可以得到水资源承载能力的评判。文中以西北地区为例进行了分析,计算结果合理。     

DISCUSSION ON SOME PROBLEMS OF USING THE CASCADE SPEED CONTROL IN ALTERNATING CRANE

Whether the cascade speed control system can be successfully used in cranernot is an mioportant research topic for electric machinery engineers in rec-ent years.This paper analyses many probleme involved in the cascade speedcontrol detail,iin ncluding the power transfer relationship,the mechanicalcharacteristics and its fitting with the load characteristics,the calculationsofahe cpacitancet and the parameters of the (?)ariable current device in thisspeed control system,and others.This paper laso gives the comparison be-cascade spee een tehtwd control and the rotor resistance control methods.     

Data Analysis Method for Neural Network Based on Short-term Load Forecasting

In neural network based short-term load forecasting, complexity and redundancy of input data have a negative effect on network training efficiency and forecasting precision. Focusing on solving this problem, a multiple method of data processing is developed. Firstly a method called input variable contribution analysis is applied, which divides input variables into primary variables and minor variables according to their contribution to network output. Minor variables are tossed out. Then principal component analysis is applied to primary variables to eliminate linear correlation among them, thus reduce the variable dimension. Based on this method, the main components are gotten, and then simplified network structure is designed. The result shows that after data processing, the training time is reduced noticeably and forecasting precision is enhanced.     

Study on Bed Load in the Changing Backwater-area of the Three Gorges Reservoir

In this paper, based on data of field measurement, physical model & math model, an analysis on bed load in the changing backwater-area of the three gorges reservoir is carried out. The unrecognized problems on bed load of the research achievements up to now were brought forward.     

The Application of Fuzzy Theory to Power Load Forecasting

A new method was presented for power load forecasting.Based on the fuzzyclustering technique,the historical samples of power load and its relative environmental factors wereclassified into several typical categories,the fuzzy numbers and sets were then used to describe thepatterns of load variation and the features of the environmental factors for every class. Finally,byunderstanding the state of future environmental factors, the future power load can be predictedthrough determining the category of load variation pottern. The validity of the proposed method wasverified with a practical medium-term load forecasting.     

Experimental Research on the Seismic Behavior of the Interior Joint with High Shear - Compression Ratios in the Frame

The reversed cyclic loading tests of 5 nearly full-scale beam-column assembly specimens with high shear-compression ratio under different axial loads in reinforced concrete plane frames have been completed,which cover the shortage in the field of high shear-compression parameter among seismic joint experiments in the world.Based on relatively complete measuring and analyses of the law for the bond and slip of the beam bar through the joint,the stress of the level stirrup legs and hysteretic dissipated energy and the change of rigidity,the characteristic of shear transfer mechanisms and damage development and comprehensive seismic behavior of the assembly are proposed in this paper.It makes it possible to improve design codes and to establish relatively reasonable analytic modes and hysteretic modes in inelastic dynamic response analyses of the frame.     

Analysis on Effect of Traffic Loads on Landslide Stability

In the design of landslide control engineering,the effect of traffic loads has not been taken into account.The authors simplified the traffic loads as mobile dead loads and traffic dynamic load.The mobile dead load ranges from 2.34 to 6.41 kPa.The impact coefficient was chosen to denote the traffic dynamic load and ranges from 0.1 to 0.4.Using several stability analysis methods widely accepted by engineers,combining two analysis samples,by the contrast of stability tests with and without consideration of the mobile dead load or the traffic dynamic load,the authors found that when the traffic load is not taken into account,the stability coefficient of shallow layer landslide(<8m) is overrated by 4.3-11 percent or 5.8-12.1 percent in comparison with the case when the mobile dead load or traffic dynamic is taken into account respectively,that is,the influence of mobile dead loads and traffic dynamic load is cannot be neglected.In case of medium deep layer landslide or the road is passing through the anti sliding section,the influence of the traffic load is a little and can be neglected.     

Optimization of Load Distribution for Industrial Boilers Running in Divided Period

A more practical and economic optimization mathematical model of load distribution for industrial boilers is presented. The optimum load rates of boilers are advanced by the method of static boiler model. The target function is built up, and in particular the restrictions are established. The theory of load assignment is checked through a project case. For various industrial boilers, once the definite characteristic functions of fuel consumption are given, the optimal load assigmnent can be obtained using this optimization model.     

The Mathematical Model and Heuristic Algorithm of the Load Balance in the Parallel Processing System

Based on the algorithms proposed before,a model and new heuristic algorithmfor solving the load balance in a parallel processing system (cell) is put forward by authors in thispeper. The optimal goal of the propsed model benefits the minimum of the load of equipment withlargest load and the difference between and two equipments in the system. The complexity ofalogrithm is not higher than O(n2). The computational experiments show that it is a practical algorithmof engineering.