Volume 18,Issue 4,1995 Table of Contents

1 Constitutive Description of Precreep-Plasticity with Experimental Verification

Peng Xianghe , Zeng Xianggou , Sun Zhenghua

1995, 18(4):1-8.

[Abstract](602) [HTML](0) [PDF 309.43 K](879)

Abstract:
In this paper we put forword a constitutive model based on thermodynamics,Byintroducing generalized time scale, unified constitutive equation including descoription of creep,plasticity and the creep-plasticity interaction effects, is presented,It is shown that the present unifiedconstitutive equation includes plasticity as one special case(dt=0)and creep as the other one(ds=0).By means of analysis of material subetructure for creep, plasticity and creep-plasticityinteraction,a multiplicative harderung function analysis developed here has been compared with Ohashi'sexperimental results,It seem that the present theory could satisfactorily describe Ohashi'sexperimental results.

2 Study on Mismatched Engagement of Hourglass Worm Gearing with The Worm Generated by A Cone and The Wheel Generdted by A Straight Profile Hob

Qin Datong , Zhang Guanghui , Kato Masana

1995, 18(4):15-20.

[Abstract](578) [HTML](0) [PDF 262.08 K](941)

Abstract:
A method to make the hourglass worm gearing with the property of mismatchedpoint contact has been proposed.The worm and the hob of the worm gearing is generated by a coneand a straight line located on the cone respectively. The basic principle of the worm gearing has beenanalysed. The formulas for calcultating the machining parameters has been obtained. And the toothcontact of the worm gearing has been investigated.The result shows that this worm gearing could getopint contact well.

3 The Application of Complementary Variational Principles in Sinusiodal Electromagnetic Field

Huang Jian , Yu Jihui , Tan Bangding , Rao Mingzhong

1995, 18(4):29-36.

[Abstract](713) [HTML](0) [PDF 310.30 K](197)

Abstract:
Considering the need in practical applications the authors extend thecomplementary variational principles from single-medium to multi-medium. The equivalencebetween variational problems and multi-region boundary value problems is proved,Utilizing theextended functional and complementary functional,we construct the complementary variationalproblem in a sinusoidal el ectromagnetic field.Several special forms in computating differentsinusoidal electromagnetic field problems are given.

4 Approach for Calculating Short Circuit on Transrmission Lines by Using Piece-wise Method with Structure Network Fault

Lu Feipeng , Mi Linshu , Liu Fangning , Jiang Kexun

1995, 18(4):37-41.

[Abstract](637) [HTML](0) [PDF 100.40 K](165)

Abstract:
Based on the properties of linear network,a new generalized diakoptical modeland its algorithm are presented in the paper to calculate short circuit at the arbitrary location on anytransmission line of large-scale power systems,in which the proposed techniques of transferring faultport current,and modifying nodal current sources and column impedence elements, are appliedcomprekensively. The method given here is espocially efficient to calculate short circuit in piece-wisemethod for any mutually coupled cuts between subdivisions in the system with constant or variablestructures. And it is an important improvement for short-circuit current calculation.

5 The Artificial Neural Network Approach for Short-term Load Forecasting

Sun Hongbo , Qin Yihong , Xu Guoyu , Luo Chunlei

1995, 18(4):42-47.

[Abstract](382) [HTML](0) [PDF 259.79 K](118)

Abstract:
提出了一种新的短期电力负荷预报方法。该法首先将小时电力负荷解成增长趋势、日模式、周模式、气候敏感及随机变动等分量，然后应用人工神经网络等方法对各分量分别预报，最后由各负荷分量相失加得到小时负荷预测值。并以我国某省实际电力系统负荷预报为例，说明了所提方法的有效性。

6 The Study of the Micrcostructure and Properties of Iron-baswd Metal and Ceramic Compcoite Material

shi Gongqi , Ding Peidao , Tang Jianxing

1995, 18(4):55-60.

[Abstract](660) [HTML](0) [PDF 279.40 K](149)

Abstract:
采用表面浸渗复合技术，通过常规铸造方法在铸铁表面获得ＳｉＯ２陶瓷颗粒增强的金属陶瓷复合层，并用于工业钢锭模的表面表强化。

7 A Study of Urease Electrode for Determination of Urea in Serum

Zhang Yunhuai , Huang Zongqing , Xiao Peng

1995, 18(4):67-71.

[Abstract](465) [HTML](0) [PDF 250.59 K](107)

Abstract:
将脲酶用戊二醛化学交联固定到单纤维尼龙网上，与氨气敏电极组合成结构简单的脲酶电极，此电极对脱有良好的响应特性，对脲浓度对数的响应线性范围为７×１０（－５）～２×１０（－２）ｋｍｏｌ／ｍ３，斜率为５２ｍＶ，相关系数０．９８８，电极寿命大于２０天，用于血清中脲的测量时样品不需要预处理，并与分光光度法所得结果有较好的一致性。

8 Deoxidation Efficency Research of Jet Themral Dloxidation

Tong Mingwei

1995, 18(4):72-75.

[Abstract](496) [HTML](0) [PDF 180.08 K](123)

Abstract:
In this papet,a new deoxidationmethod-jet thermal deoxidation of industrialfeedwater was presented,a preliminary theoretical anlysis of mechamism of deoxidation methed wasmade. Using this experimental method,we studied the deoxidation methed and checked the effect ofthe temperatare pressure fogging state and jet direction on the deoxidation efficiency.

9 The Influence of Width of Flag-type Inserts on the Forced Convection of Oil in a Tube

Chen Li , Xiang Dong , Chen Qinghua

1995, 18(4):76-80.

[Abstract](618) [HTML](0) [PDF 221.54 K](139)

Abstract:
Experimental study of forced convection heat transfer in a horizontal circulartube with ladder-shaped flag-type insert is performed to investigate the characteristics of fluid flow ,heat transfer and the influence of width of flag insert.The working fluid is 30# turbine oil.Theresult shows that the increase of W/D causes the increase of heat transfer coefficient and resistanceforce of fluid flow. The heat transfer coefficient can be enhanced mainly within the length of ninetimes of inner diameter of tube for oil.In the range of experiment, the value of creteria to evaluatethe combined effect is between 1.13 and 1.59.

10 On System Stability under Random Perturbations

Huang Wei

1995, 18(4):81-85.

[Abstract](785) [HTML](0) [PDF 184.29 K](162)

Abstract:
In this paper we concider the problem of stability of stochastic evolution systemsin Hilbert space drived by a cylindrical Brownian mothin. We regard the stochestic evolutionequation dXt = AXtdt +G(Xt)dBt as a deterministic system of the form dXt=AXtdt under randomperturbation,and obtain stability of its solution. It is shown that under certain assumptions,itsevolution solution and L2-contimuous evulution solution are exponertially stable.

11 The k Order Busy Peried of Queueing System be/M/n

Sun Rongheng , Sun Yu

1995, 18(4):86-90.

[Abstract](541) [HTML](0) [PDF 149.14 K](865)

Abstract:
讨论了排队系统Ｇｅｏ／Ｍ／ｎ的ｋ（ｋ≥０）阶忙期，获得了此系统ｋ阶忙期的分布和前两阶矩的简单表达式。

12 The Rheological Properties of the Cell Wall Polysaccharides from Waste Yeast Paste of Beer

Wang Guangci , Liu Langxin , Cheng zongdao

1995, 18(4):91-95.

[Abstract](719) [HTML](0) [PDF 208.69 K](946)

Abstract:
考察了从啤酒厂废酵母泥中提取的酵母胞壁多糖的溶液粘度与溶液浓度、酸碱度、温度、剪切速度、离子强度等因素的关系。结果表明：以上各因素对酵母胞壁多糖溶液粘度都有不同程度的影响，其流体表现为非牛顿假塑性。

13 Research on the Rheology Behaviour of Rock Salt

Qiou Xiande , ZhungQiancheng

1995, 18(4):96-103.

[Abstract](649) [HTML](0) [PDF 321.50 K](1205)

Abstract:
用自行设计的械杆式流变仪，对长山、乔后岩盐的蠕变、松驰、弹性后效流变力学特性进行了试验研究。研究表明，长山岩盐的变形受位错及晶闸界面的控制，在长期蠕变中以位错滑移为主，该岩该主要呈现脆性破坏。

14 Mathematical Medel for Heat Transfer on Solididing Ladle of Hot Metal

Tang xin , XuChushao

1995, 18(4):104-109.

[Abstract](742) [HTML](0) [PDF 249.71 K](1528)

Abstract:
In this paper,solidifinG ladle of hot metal has been studied from the point ofview of heat transfer.A mathematical model,which is applied to predict the shape and the thicknessof solidifing layer,has been developed. The theoretical calculated results agree with the appliedresults in preduction. The effects of various paramenters,such as the circulating times, the inner-surface temporature of ladle and the different refractories,on the shape and the thickness ofsolidifing layer have been discussed.These are contributed to reduce the solidifing ladle of hot metal.

15 Researches on Melting-points and Visccoity of Mould FluxesWei Qingcheng

DhgYunqiao , Peng Kediao

1995, 18(4):110-114.

[Abstract](913) [HTML](0) [PDF 220.01 K](1028)

Abstract:
The testing of the melting-points and viscosity of BaO-SiO2-CaO-Al2O3(5%)-Na2O(10%)-CaF2(1 0%)six-part slag system is completed. Then the curve charts of the melting-points and viscosity are drawn. Moreover, the mathematical relations between properties andchemical compostion are found out.As a result,the proper range of chemical composition for BaO-contained mould fluxes is therefore presented.

16 Fracture Analysis of Tense Bolt

ZhaoChangfu

1995, 18(4):115-119.

[Abstract](683) [HTML](0) [PDF 183.37 K](1026)

Abstract:
In this methods of fracture mechanics and reliability are used toanalyse the causes for failure of a flange bolt connecting an inclinded rope to the natural gas pipelinebridge spaning the Changjiang(the Yangtze River)loeated at Chongqing and the proper safetymeasures that should be required are propozed.

17 A Kind of Fuzzy Optimization Model & Algorithm for Wine Quality EValuation

Huang Xiyue , Deng Renming , Liang Shan , Wang Honggang , Bai Liang , Shi Weiren

1995, 18(4):120-124.

[Abstract](543) [HTML](0) [PDF 184.63 K](755)

Abstract:
A new kind of interactively optimization model&algorithm based on fuzzytheory to evaluate the quality for wine is presented in this paper.The practice shows the presentedmode&algorithm is effective and the evaluation result is satisfactory.

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