Research Progress in HSAB Theory and Leather Chemistry

The progress of applying HSAB theory to leather chemistry was reviewed.The stability and the tanning property of hydroxo complexes and the dechroming from leather shavings were expounded according to the absolute hardness from density-fu nctional theory and the softness from the theory of the mutual perturbation of the frontier- controfled molecular orbitals,The concept of accumulative propery of hydroxo compounds was posed as well. Finally,the future in this field was looked into.     

An Analysis of the Loop Performance of the PLL-FM

Analyzing the responses of three kinds of PLL-FM ways and their stabilities. The analyses have shown that the circuits of these PLL-FMs show Low-pass property in the input phase,and have different characteristics to modulation signals in accordance with different ways of PLL-FM.     

Calculating Critical Loads of Thin Plates With Method of Weighted Residuals

In elastic mechanics, it is common practice to calculate critical loads in buckle of thin plates by means of double triangle series. The calculation process is more complex, this method has not facility in engineering application. In many cases critical loads of thin plates can not obtain precise analytic solutions. It is very important to solve approximate resolutions of critical loads of plates in engineering. The method of weighted residuals is an available measure to solve proximal resolutions of differential equations and has extensive application in egineering. In order to simplify calculation process and obtain profitble result, by means of method of weighted residuals and Cantorovich variational principle, taking the second Tchebychev's polynomials as trial functions, it was calculated, critical loads of rectangle thin plates in different supporting conditions. Calculation results indicate that this calculation method is simple and has some precision, it is applied conveniently in engineering.     

The Origin and Implication of Chinese Traditional Courtyard Pattern

During thousands of years, the Chinese traditional architecture has almost followed only one pattern-the courtyard one. In this paper, the ideal living mode of "Tian ren he yi"(unity of the heaven and human beings) is expatiated. Then, the response of courtyard to this living mode is analyzed and the origin and signification of courtyard are discussed. At the end, how to keep and develop the vitality of traditional courtyard in modern times is investigated.     

Analytic Method for the Free Vibration of Plane Frame Structure

The analytic method for the free vibration of plane frame structure is presented. It is achieved by transforming the general eigenvalue problem of natural frequency and vibration mode of continuously distributed property system into typical boundary value problem of ordinary differential equation (ODE). A series of ODE, corresponding to the general eigenvalue problem, is formed, and then is solved by an general ordinary differential equation solver-COLSYS. Each component of a frame structure is regarded as an element in the analytic method. This makes it more efficient than that of finite element method which needs to increase elements to get the value of high-class natural frequency and vibration mode accurately. Some applications of the method show that it can solve the free bending vibration of plane-frame structure with various types of displacement constraint. The result indicates that this method is precise and efficient.     

Robust Control System for the Optical Extra-precise Vibration Isolation System

The robust control theory is used to solve the uncertainty of the optical extra-precise vibration isolation system. The wavelet theory is used to analyze the random vibration signal in the time-frequency domain and get the low frequency signal from the random vibration signal. The robust controller designed by the robust control theory is used to restrain the low frequency vibration. The active vibration isolation exploits the theory of robust control, which overcomes the uncertainty of model and the disturbance, and makes the control system to restrain the uncertainty of the model and the disturbance of the vibration. The simulation results prove that this method has shown good robustness and control precision in the vibration isolation of the optical extra-precise instrument and have good performance on restraining the low frequency vibration.     

Mchanism of Oganic Wstewater Teatment by Cavitating Jets

Present main method of organic wastewater treatment are physico- chemical method, biochemical method and combination method, but there are many problems need to be resolved, such as organic matter can not be treated thoroughly, fee is high, and operation is complicated. Cavitation jets is a efficient and simple new technology on organic wastewater treatment. It use local high temperature and high pressure produced bubbles collapse to degrade organic matter, and it is better in capacity usage ratio than ultrasonic cavitation. Principle of eavitating jets is giuen, then discussed mechanism of organic wastewater treatment by cavitating jets from free radical reaction, direct thermal decomposition and supereritieal water oxidation, and influence of nozzle stricture is analyzed, jet cavitation number, pumping pressure, confining pressure and physieoehemieal property of organic wastewater on cavitation effect.     

On the Regional Culture Features of the Traditional Folk Housing Architecture of Huizhou Style

The traditional architecture of Huizhou style with its unique regional cultural features makes a well- developed genre of architecture in late ancient China. Especially, the traditional folk housing of Huizhou style is the most vivid embodiment of Huizhou culture, reflecting the social history and culture in Huizhou area. The location and setting of the traditional folk housing in ancient Huizhou is greatly influenced by the geomantic theory, a fact that can be best detected in the practice of building artificial landscapes at the accesses to villages. The internal structure of the traditional folk housing of Huizhou style vividly reveals the ideology and the system of the patriarchy in ancient Huizhou. Being traders but sticking to the identity and temperament of Confucian scholars, local merchants of ancient Huizhou fostered a unique culture, which has shaped an distinctive artistic charm found in the internal decoration and furnishings of the traditional folk housing in ancient Huizhou.     

Approach to Vendors and it''s Purchasing Quantities Selection Based on Improving Market Efficiency

The market efficiency in DEA is used to evaluate vendors under the hackground of vendors and it's purchasing quantities selection in supply chain management. An ideal targets set by the buyer is determined in order to make inefficiency vendors improving the efficiency score and competition. This paper proposes a buyer-sell game model that has distinct advantages over existing methods in selecting an optimal set of bids and it's purchasing quantities that satisfy the buyer's demand, and the improving market efficiency is also considered.     

A SURVEY STATION OF MEASURING DAYLIGHT AND SOLAR IRRADIANCE IN CHONGQING

This paper intreduces a survey station of measuring daylight and solar irradiancein Chongqing.It has been set up for responding to the International Dayllght Year.From the ways ofmeasuring place,instruments,data and results,etc. the station has run successively in two years tomeasure eleven data about irradiance and illumination etc. by automatic measuring systems.A vastamoun t of scientific data is collected and these firstha nd reliable in formations are provided to day-light climates research in Chongqing.Both data results and measuring means corne up to advancedworld standards.Modern science and technology are successfully applled to daylight measuring andresearch.