In this paper, the technical conversion of electronic control gasoline injection engine into LPG liquid injection (LPI) engine is introduced and the research about LPI engine performance is conducted. The results show that LPI engine power can get the same level with original gasoline engine, fuel consumption has some improvement, and exhaust emission can meet the Europe II standard. However, according to the durability test, the materials of the intake valves and intake valve seats are to be improved.

This paper focuses on the matching of electric vheicle power-train with AC motor. The results show that constant power characteristics of AC output is suitable for electric vehicle. It also shows that the optimal ratio of drive train satisfies the performance and economy requirements of electric vehicle and makes vehicle acquire better criteria of tractive performance and fuel economy.

Based on the discussion of the energy-saving control system method and theory of home-made excavator and the overseas in detail, a new control system-the intelligent PID expert control system under divided status has been successfully developed from the point of view of saving energy, based on the advantages of the speed control system and the pressure control system. Computer simulation and experimental test are both carried out according to this theory.

The research on the theory and quality control techniques of spot welding nugget formation is the main hotspot and frontier in material science. In this article the new techniques-spot welding nugget inoculation proposed by the authors is applied to 65Mn and LY12CZ. Systematic procedure experimentation and micro-structure analysis have been carried out. It gives a preferable explanation and evaluation to the inoculation mechanism and effect that inoculation can enhance the mechanical properties of spot welding joint, producing and enlarging equiaxed grains structure area, diminishing and eliminating weak area and restraining the occurence of macro flaw etc.

The principle has been studied about the same pressure reduction to design characteristics of the runner system of injection mould, which inquires into the design formula of other runner and linearized and dispersed of mathematics model about the tubular cylinder linear runner by means of this principle. The optimized formula has been worked out about the runner interation design in injection simulation.

The wettability and shearing strength for CuZn filler meters brazing white east iron are lower than those of CuZn filler meters brazing steel. The erosion of white cast iron over-dissolving into filler meters is the main cause of the reduction of the wettability and shearing strength. By means of the quadratic regression composition design process, the regression equations between wettability, mechanical property and elements are established. The influence of the elements on the wettability and shearing strength is also analysed. The multiparameters optimization and solution for the wettability and shearing strength on the multicomponent Cu-base filler meter are studied by Genetic Algorithm. The study has proved that the optimal contents and properties used for brazing white cast iron can be obtained by Genetic Algorithm.

In this paper, the authors first describe the characteristics of laminated materials and its applications, analyze its structural properties, and present conceptions of the bounding pod and multi-bounding pad. On the basis of this, the authors establish the machining model of vibration drilling laminated materials by variation parameters and present five-stage vibration drilling model by variation parameters for laminated materials with three layers. Machining experiments in many kinds of laminated materials show that machining quality can be greatly improved by vibration drilling model with variation parameters and the machining is reasonable and practical.

Researches focus on the aorta abdomen veins of the normal Chinese fresh dead bodies. Experiments are carried out on the stress relaxation and creep, thus obtaining the stress relaxation and creep data and curves of the aorta abdomen under the situation of constant stress and strain. Through regression analysis the authors obtain the reduced stress relaxation and creep functions. Finally, the results of the experiments* are analyzed and discussed.

The uncertain socioeconomic model is first built that of investment preventing from disaster and soil utilizing. Compared with economic model built before, the uncertainty of disaster was mastered first, and investment preventing from flood was connected with the choosing action of soil purchasing. On this basis, multi-area general equilibrium theory was quoted, the action of consumer was studied by utility theory under the condition of uncertainty, the diverse value view of consumer, that is economic main body was researched by random utility theory. The socioeconomic not only can master the action of diverse social economic main body under the condition of uncertainty, analyze the effect of investment preventing from disaster, but also can analyze the running mechanism of the choosing area action connecting with investment preventing from disaster. This paper illustrates the practicability of this economic model by the investment preventing from flood and knowing in advance the effect of soil utilizing in a certain area inside the country.

This paper mainly presents a homotopy interior point method and its computer realization for nonconvex and non-smooth programming that is abstracted from a kind of problems in green manufacturing practice. It is proved feasible by a numerical problem.

In this paper, based on the specialities of character variables, the authors introduce several functions in FoxPro, which break through the restrictions of 18-bit numerical precision, and can be used to process addition, substraction, multiplication and division with hundred bits, and expand the ability of calculation in database system. By means of these functions, the authors improve the known calculating result about Bernoulli number in FoxPro.

The author studies the panconnected graphs under the condition that d(x)+d(y)≥n+1, which improves the result in reference[1], [2] and [3], let x, y satifsying d(x, y) = 2.

The GaAlAs/GaAs material with gradient refraction index separate confinement single quatum well structure has been worked out by MBE. Array laser diodes CW output power achieves 10W under the room temperature. The peak wavelength is 806～809 nm.

The xylene-methylaldehyde is prepared from xylene and polymethylaldehyde with the heteropoly acid catalyst. The influence of the reaction conditions on the activity has been investigated. The catalyst can be separated easily and continue to be used in the following reaction.

The paper proposes an improved algorithm of multisensor data fusion for target recognition and classification. In the data fusion process, fuzzy mathematics and Shafer-Dempster evidential theory is selected and used for the data fusion. By comparing the simulation experiment results based on separate original data and fused data respectively, the research has reached the conclusion that the latter is more accurate than the former.

A new kind of electricity transformer, which includes capactiors、diodes and switches, is introduced in this paper. It is an unilateralism-transforming device, which can dispart high import voltage under the case of inputing and outputing by turns, and output tow voltage of direct current. Its impedance transmitting ratio of input and output is N². "N"is the number of capacitance in it,D.C voltage divider includes switch- ing power and electricity-transformation, so that it can be used to design lower voltage of direct current power.

The sustainable development of enterprises is very important. In the paper, the author designs the evaluation indexes system of the sustainable development for the manufacturing enterprises, according to the production and technology characteristics of manufacturing enterprises. Then the author analyzes the relationship between the indexes system and the sustainable development of enterprises. Furthermore, the author develops the evaluation model system based on the abovementioned indexes system. Finally, the author illustrates the specific method which can be used to evaluate the situation of the sustainable development for the manufacturing enterprises.

The authors adopt both indexes of the economic and social efficiency to evaluate comprehensively the performance of the tourist industry in China in this paper.

External environment plays an important role in the venture capital development. From culture environment, policy environment, science and technology environment and social service enviroment, the authors analyse some critical factors of restricting venture capital development in Jilin province, and put forward some suggestions and give some advice.

With the increasing number of city vehicles, the vehicular pollutant dispersion plays a more and more important role in air quality in city. The research results from this paper will be helpful for evaluation of injurious effect of vehicle on pedestrians and city street planning. This paper describes the current study on vehicle pollutants dispersion in the urban street canyon.