Series Design of Large-Scale N C Machine Tool

Product system design is a mature concept in western developed countries. It has been applied in war industry during the last century. However,up until now,functional combination is still the main method for product system de-sign in China. Therefore,in terms of a concept of product generation and product interaction we are in a weak position compared with the requirements of global markets. Today,the idea of serial product design has attracted much attention in the design field and the definition of product generation as well as its parameters has already become the standard in serial product designs. Although the design of a large-scale NC machine tool is complicated,it can be further optimized by the precise exercise of object design by placing the concept of platform establishment firmly into serial product de-sign. The essence of a serial product design has been demonstrated by the design process of a large-scale NC machine tool.     

STRUCTURE AND STABILITY OF MAIN ROOF AFTER ITS FRACTURE

A serics of physical modelings in which a main roof is considered as a Kirchhoff plate supported or clammed by Winkler elastic foundation were performed to simulate the fracturing process of the main roof in longwall mining. Based on these modelings spatial structures of the main roof after its fracture are described, blocks of the fractured main roof are classified and their behaviors are analyzed in this paper. Additionally, two stability indexes of the structures are defined, and the factors affecting stability of the structures with different boundaries and geometric conditions are discussed.     

STUDY OF THE THERMODYNAMICS DURING THE HYDRATION AND HARDENING OF ANHYDRITE

The process of hydration and hardening of theanhydrite,and the condition of practical use of itsproducts have been studied by way of the thermodyna-mic calculation.The calculated results show thatthe hydration reaction of anhydrite is a spontaneousprocess and follows the dissolution-crystallizationmechanism it is also shown that the drying-curingtemperature of the anhydrite products can not behigher than 85℃ and the temperature of practicaluse of its products can't be higher than 48℃ underthe moist environment.     

SELECTION OF HORIZONTAL DISTANCE X BETWEEN ROADWAY AND THE EDGE OF ITS UPPER PILLAR

The horizontal distance X between roadway and the edge of its upper pillar is considered as an important parameter for layout of roadway in floor strata or in the adjacent coal seam. Based on the research achievements of rockstrata pressure, this paper illustrates the quantitative relationship among the mining situation of upper seam, the roekstrata properties around roadway, the vertical distance Z (between roadway and its upper pillar), and the horizontal distance X (between roadway and the edge of its upper pillar), and provides a main basis for the selection of value X and the relative location between roadway and its upper seam.     

Magnetic field properties caused by stress concentration

Measurements of the effects of tensile stress on magnetic field properties, infrared thermography and acoustic emission of a cuboid sample with an elliptical hole in its center were presented. The tensile stress was applied perpendicularly to the sample by electro-tension machine according to a step-loading curve. The changes of the sample temperature was recorded by an infrared thermography system and the noise of domain reversal was inspected by two acoustic probes, which were placed on each end of the sample near the collets of the electro-tension machine,when the sample was in loading process. The magnetic fields on the surface of the sample were inspected with 8 mm lift-off when the loads were held. Valuable information about the changes of domains was obtained from analysis of acoustic emission signals in loading process. Infrared images of the sample provided complementary information about the state of the sample. The results show that stress concentration in ferromagnetic material affects the direction and structure of domain and generates net magnetic moment on its surface. The distribution and magnitude of the net magnetic moment are correlative with those of stress.     

Artificial emotional model based on finite state machine

According to the basic emotional theory, the artificial emotional model based on the finite state machine（FSM） was presented. In finite state machine model of emotion, the emotional space included the basic emotional space and the multiple emotional spaces. The emotion-switching diagram was defined and transition fimction was developed using Markov chain and linear interpolation algorithm. The simulation model was built using Stateflow toolbox and Simulink toolbox based on the Matlab platform. And the model included three subsystems： the input one, the emotion one and the behavior one. In the emotional subsystem, the responses of different personalities to the external stimuli were described by defining personal space. This model takes states from an emotional space and updates its state depending on its current state and a state of its input （also a state-emotion）. The simulation model realizes the process of switching the emotion from the neutral state to other basic emotions. The simulation result is proved to correspond to emotion-switching law of human beings.     

Checkpointing and rollback recovery for network of workstations

Network of workstations (NOW) now becomes one of the main trends of parallel computing. But for long-running scientific programs, it needs effective fault tolerance for its changing property. Checkpointing and rollback recovery is a solution to this problem. First the main problems upon rollback recovery are discussed, the different checkpointing techniques for NOW are analyzed, and then the design and implementation of ChaRM (checkpoint-based rollback recovery and process migration) system are described. The comparison of three coordinated checkpointing systems is given.     

A STUDY ON THE DECLINE FUNCTION OF THE PROPERTIES OF CEMENT COMPOSITE SUFFERING iN THE FREEZING-THAWING CIRCLE

This Paper is a study on the rule of the decline of properties of cement composite being damaged in the freezing thawing circle. By analyzing the damaging process of cement composite in such a circle,the author sets up a model of "vicious circle" and then deduces and proves the decline function of the properties of the cement composite. It is proved that the frost-resistance of cement composite depends on its internal hydraulic pressure. A fast testing method and a judging index R_f for the frost resistance of cement composite are also suggested.     

Fuzzy control on automatic frequency tracking of ultrasonic vibration system with high power and high quality factor Q

In order to realize automatic tracking drift of resonance frequency of ultrasonic vibration system with high power and high quality factor Q,adaptive fuzzy control was studied with a self-fabricated ultrasonic plastic welding machine.At first,relations between amplitude of vibration and frequency as well as main loop current and amplitude of vibration were analyzed.From this analysis,we deduced that frequency tracking process of the vibration system can be concluded as an optimizing problem of one dimensional fluctuant extremum of main loop current in vibration system.Then a method of self-optimizing fuzzy control,used for the realization of automatic frequency tracking in vibration system,is presented on the basis of self-optimizing adaptive control approach and fuzzy control approach.The result of experiments shows that the fuzzy self-optimizing method can solve the problem of tracking frequency drift very well.Response time of tracking in the system is less than 50 ms,which basically meets the requirements of frequency tracking in ultrasonic plastic welding machine.     

A CORRECT APPROACH TO THE IMPROVEMENT OF THE QUALITY OF RAW SILK REELEDON AUTO-REELING MACHINE

The size deviation and the evenness of raw silk are the two maior inherentquality Indexes of raw silk.At present the grading of raw silk in our country ismostly done in the light of the second degree change of evenness High qualityraw silk is reeled on multi-end reeling machine.So a break through in controllingthe size deviation and evenness is of vital importance to enable auto-reelingmachine to reelhigh quality raw silk and thus win its popularization This paperStarts with theoretical analysis,go with brief on the experiments done formore than a year,on shortening the time of miss feeding to obtainsatisfactory results,and in the end gives a picture of the measures taken forimproving the qulity of auto-reeled raw silk.     

被控煮茧过程及其控制方式分析

本文把温度作为煮茧过程控制的主要参数,对煮茧过程的特性进行了解析,并对煮茧的过程控制的常用方式进行了分析。所得结论有助于丝绸工程的技术改造     

制浆蒸煮过程自动控制系统的设计

在简要介绍了影响制浆蒸煮质量的主要因素之后，提出了一种行之有效的蒸球蒸煮自动控制方案，阐述了该方案的控制系统组成、软件设计以及采用的控制算法及其实现方法。实际运行表明本系统控制稳定，经济效益明显。     

煮熟茧动态解舒张力的计算机检测及其探讨

本文利用微型电子计算机技术,建立了一套煮熟茧动态解舒张力的计算机自动检测系统.在不同的煮茧工艺条件下,对解舒优劣不同的两种原料煮熟茧的动态解舒张力进行了检测分析,定量检测得到了较为可靠的数据.分析所得出的结论,对于完善煮茧理论、评定煮熟程度、鉴别茧质优劣、改进煮茧工艺、提高生产效益,具有一定的实际意义.     

煮熟茧动态粘弹性的计算机检测及其探讨

本文利用微型电子计算机技术,建立了煮熟茧动态粘弹性的计算机自动检测系统,在不同的煮茧工艺条件下,对解舒优劣不同的两种原料煮熟茧的动态粘弹性进行了检测分析,得到了较为可靠的数据。指出了有关文章所采用的煮熟茧动态粘弹性参数的一些问题,并提出了合理选用参数的方法。得出的一些结论,对于完善煮茧理论、评定煮熟程度、鉴别茧质优劣、改进煮茧工艺、提高生产效益,具有一定的实际意义。     

烹调中反式脂肪酸成因分析

食物中反式脂肪酸主要来自于氢化油、精炼油、焙烤食品、辐照食品和煎炸食品。烹调中诱发产生的相关因素包括烹调的温度和时间、烹调用油脂的种类与使用方法、食品原料的种类等。根据煎炸、爆炒、烧烤等烹调过程中反式脂肪酸形成的机理,采取相应的控制措施,可以减少潜在的危害,提高烹调制品的安全性。     

RESEARCH ON COMPUTER TESTING OF THE DYNAMIC DISSOCIATING TENSION OF COOKED COCOON FILAMENT

This paper discussed the setting up of a comeuter automatic system for testing the dy-namic dissociating tension of cooked cocoon filament by means of microcomputer tech-niques.The dynamic dissociating tension of two kinds of row cocoons with differentreelability was tested and analysed under different cocoon cooking conditions.More relia-ble data have been obtained by quantitative tests.The conclusions reached by analysingthese data are of practical significance to perfecting the cocoon cooking theory,assessingcocoon quality,improving the cocoon cooking process,etc.     

化学助剂在煮茧上的应用

本文就硅溶胶和渗透剂组成的复合助剂对煮茧质量、丝质的影响作了较为系统的探讨。提出加用该复合助剂煮茧能使茧层渗透充分、均匀,促进丝胶的膨润软和,又能增强茧子的抗煮力,故可作为提高蚕茧解舒率、出丝率的煮茧助剂。     

差原料煮茧新工艺在生产中应用

本文应用实验计划法研究了煮茧工艺及制丝助剂对差原料茧的净度解舒率、缫折等指标的综合影响,得出触蒸前处理后加助剂等方案,使解舒率、净度提高,同时缫折也下降的效果,在生产中取得了明显的经济效益,为煮茧工艺优化处理在煮茧生产中应用提供了实例.     

MEASUREMENT AND ANALYSIS ON THE DYNAMIC VISCOELASTICITY OF COOKED COCOONS

By the measurement and analysis on the viscoelasticity of cooked cocoons,theconclusion has been obtained that under the condition of random sampling,the loga-rithm attenuation factor of amplitude obeys normal distribution. The measuring sam-ple size of cooked cocoons is explored.The mathimatic formula between cook periodand the logarithm attenuation factor of amplitude of cooked cocoon is known.Thisperfected the theory of measuring the degree of cocoon cooking by instruments.     

煮熟茧动态粘弹性的测试分析

本文通过对煮熟茧动态粘弹性的测试与分析,得出了一个庄口的煮熟茧在随机抽样的情况下,其振幅的对数衰减值服从正态分布,还对其煮熟茧测试的样本容量进行了探讨.初步了解了煮茧时间与煮熟茧振幅的对数衰减值之间的数学表达式.这些进一步充实了用仪器来测定茧煮熟程度的理论.