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ISSN 1674-2850
CN 11-9150/N5
 
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March 15,2009
Volume 2,Issue 5
Pages 428-550
Subject Area:Agricultural Production Economics,Economics of Energy Technology,Economics of Environmental Protection Technology,Educational Technology,Higher Education,Fracture Mechanics,Explosion Mechanics,Fluid Mechanics
 
Title: A discussion on the operating mode of internet technical forum
Authors: ZHANG Wei, GUO Yinan, FU Hongjiao
PP: 544～550
Abstract: A technical forum can always bring both economic benefits and social benefits to the modern society. This paper means to provide a suitable operating mode of internet technical forum. The mode is proposed by the research of 42 websites. The mode concerns both economic benefits and social benefits. The authors hope that the new mode will bring more benefits to the Internet users and the internet itself. Meanwhile, the paper gives some valuable conclusions on the development of technical forum.
Keywords: management science and engineering; operating mode; technical forum; economic benefits; social benefits
 
Title: Empirical analysis on the relationship between consumption expenditure and disposable income of urban residents in Sichuan Province
Authors: CHEN Xueling, REN Dating
PP: 539～543
Abstract: In order to research the correlation between consumption expenditure and disposable income of urban residents in Sichuan Province，this paper discusses the basic law of their quantity relationship, reveals the role of disposable income in consumption expenditure of urban residents, and gives rationalization suggestions for the macroeconomic operation in Sichuan Province. According to the basic data of urban residents’ consumption expenditure and disposable income in Sichuan Province from 1977 to 2006, by means of the simple linear regression model, this paper analyzes the quantity relationship between the consumption expenditure and disposable income. The simple linear regression effectively reveals the basic law of quantity relationship between the consumption expenditure and disposable income of urban residents and can be used to predict the urban residents’ consumption expenditure in Sichuan Province. Based on that above, this paper gives suggestions about increment of residents’ income, improvement of consumption environment, perfection of related measures to increase residents’ consumption expenditure and increment of consumption level.
Keywords: econometrics; consumption expenditure; disposable income; simple linear regression
 
Title: Cost-revenue analysis of the grain producers and an exploration on the patterns of raising agricultural revenue
Authors: XU Jihong, LUO Xuan, SHA Jinghua
PP: 533～538
Abstract: In recent years, due to the rising of energy prices, impact of climate change on crop harvest, increasing demand of emerging economies, and the development of bio-fuels and so on, the global grain prices increased sharply. By March of the year 2008, the export prices of rice which is the staple food of residents in Asia-Pacific region increased by 98%. At the same time, prices of agricultural stuff have also appeared in a certain range of accretion, which promoted the increasing of grain planting cost. Through field survey in Yonghe town, Shangyu City of Zhejiang Province about the general situation of grain planting, grain prices, costs and revenue for farmers to plant grain in the region, as well as the cooperative mode of grain communities, a conclusion is drawn that at the present stage the grain price in our country is lower than the theoretical level, while the cost is higher. And a more intensive production of a larger scale will benefit the grain producers with a considerable revenue.
Keywords: agricultural economics; revenue of grain planting; cost of grain planting; general farmers; grain producers of a large scale
 
Title: The comparative analysis on technical efficiency of three-time industry in Jiangsu Province based on stochastic frontier approach model
Authors: HAN Yanchao, XU Yingzhi
PP: 524～532
Abstract: This paper collected the panel data of three-time industry in the cities of Jiangsu Province from 2000 to 2007, and analyzed the differences of production technical efficiency and the regional differences of three-time industry. It was found that the technical efficiency of primary industry was lower than tertiary industry, and tertiary industry was lower than secondary industry. The technical efficiency of primary industry increased year by year, but the technical efficiency of secondary industry and tertiary industry decreased year by year. The tertiary industry descended faster than the secondary industry. The regional difference of technical efficiency was significant. The technical efficiencies of central Jiangsu and northern Jiangsu were higher than southern Jiangsu taking account of primary industry. The technical efficiencies of southern Jiangsu and central Jiangsu were higher than northern Jiangsu taking account of secondary industry and tertiary industry. The technical efficiencies of Wuxi City, Nanjing City and Changzhou City kept ahead in secondary industry and tertiary industry. The technical efficiencies of Suzhou City kept ahead in three-time industry. Suqian City, Huaian City and Lianyungang City were behindhand in Jiangsu Province. Based on the result, this paper put forward corresponding recommendations. These recommendations would have a positive practical significance for the economic development of Jiangsu Province.
Keywords: national economics; stochastic frontier approach; three-time industry; technical efficiency
 
Title: Analysis on production effect of government expenditure in economic growth model
Authors: ZHANG Jianhu, LIU Wenbin
PP: 517～523
Abstract: When the production function was general, using theory of control and theory of stability, this paper discussed the production effect of government expenditure and fiscal policy, and got the expression of economic growth rate and structure stability of the economic variables when the production function was constant return to scale or increasing return to scale or decreasing return to scale, and pointed out how the interrelated parameters affected economic growth rate. It was shown that when the production function was constant return to scale, the model became a A-K model; when the production function was increasing return to scale, the equilibrium point was unstable; when the production function was decreasing return to scale, the equilibrium point was a saddle.
Keywords: mathematical economics; economic growth; government expenditure; production effect
 
Title: Analysis of the multifactors influencing Chinese petroleum security and the safety strategy
Authors: CHEN Huifen, DENG Xiang2, ZHANG Bin
PP: 510～516
Abstract: Petroleum security has different meanings for different types of countries, referring to China it is petroleum supply security. On the basis of economic analysis on the security of petroleum supply, this paper discusses all of the factors impacting Chinese petroleum supply security from both domestic and international aspect, which come to nineteen. The factors include domestic ones such as the domestic oil resource supply, utilization and oil reserve and international ones such as probability of obtaining foreign oil, price and transport. The strategic choices to ensure the safety of Chinese petroleum include adapting to the new changes of the world geopolitical environment, striving to create a conducive one to guarantee the security of petroleum geopolitics; adjusting the mode of oil import trade, using oil futures and random stock to evade price risk and guarantee the security of petroleum price; and realizing the diversification of oil transportation to guarantee the security of petroleum transport.
Keywords: resources economics; petroleum security; factor; strategy choice
 
Title: Analysis on stimulation mechanism of enterprise environmental protection based on the principal-agent theory
Authors: LIU Xu, LIU Xue, LEI Ting, MA Zhong
PP: 505～509
Abstract: In order to solve the problems of asymmetric information while government stimulates enterprises to protect the environment, by the analysis of the game relationship between government and enterprises, this paper has made an ideal model based on the principle-agent theory and built an efficient stimulating mechanism. Then it conducted the mathematic solutions to the models so that to solve a series of problems faced by government when it stimulates enterprises to do active environmental protection. In addition, based on the realities of environmental protection carried out by enterprises in China, it has analyzed the gap between the ideal and factual condition and recommended some measures for adjustment.
Keywords: environmental economics; principle-agent; government; enterprise; stimulation to the protection of environment
 
Title: Design of RDF-based mobile learning resources standard
Authors: ZHANG Chi, LIU Hongpei, CHENG Yuanxian
PP: 498～504
Abstract: The standardization of learning resources is drawing more people’s attention. Based on the comparison of the standards of educational resources at home and abroad, this paper consults the national network education technical standard China ELearning Technology Standard(CELTS), and takes fully into account the mobile devices’ limitation in terms of performance, network environment and the highly personalized characteristics of mobile learning, uses the resource description framework(RDF), which is recommended by the W3C to design the basic framework for the sharing of mobile learning resources, implements the primary creation of mobile learning resources standard, and gives an example based on the existing learning resources.
Keywords: educational technology; mobile learning; resource standard; China ELearning Technology Standard; resource description framework
 
Title: The research on the harmonious development between higher education and regional economic development:on the viewpoint of higher education scale
Authors: WANG Changxi, TANG Min
PP: 493～497
Abstract: On the viewpoint of higher education scale, using the quantitative methods to analyze the relationship between higher education and regional economy development, this paper proposes harmonious development strategies between higher education and regional economy by categories. In the areas of harmonious development, it is necessary to vigorously promote higher education and coordinated development of regional economy, but more attention should be paid to the western higher education and the regional economic development. In the areas of disharmonious development, which are divided into two situations: one is that the scale of higher education is higher than the level of regional economic development, the other is that the scale of higher education is lower than the level of regional economic development, from the view of harmonious development between higher education and regional economy, colleges and universities should adjust the development strategy in light of the existing regional economy reality, to promote the sustainable development of regional economy.
Keywords: regional economics; higher education; the scale of higher education; regional economic development
 
Title: An investigation and comparison of practical teaching system for management courses of universities in Jiangsu Province
Authors: CHEN Hong, CHEN Yurong, LI Na, YAN Na, LUO Ji
PP: 488～492
Abstract: Three categories of practical teaching methods for management courses are proposed, which are: point-mode, line-mode and plane-mode, and four universities in Jiangsu Province are picked to investigate factors and effects of practical teaching. The effects and the evaluation of various practical teaching methods from students have some differences and common ground between universities. The main differences are: impacts of practical teaching methods for management courses in these universities are different, and students’ evaluations of these teaching methods are varied. The common points are: the degrees of satisfaction of teachers’ guiding and students’ participation are normally high, while evaluation mechanism, resource supporting and enterprises’ corporation rate lower. Furthermore, the problems of practical teaching for management courses and their reasons are looked into based on the survey data. Finally, this paper puts forward five disciplines of combining teaching with practice.
Keywords: higher education; practical teaching system research; management courses; comparison analysis
 
Title: Reflection on college English electives
Authors: WEI Xianjun, SUI Li
PP: 482～487
Abstract: Along with the world economic development and international cultural blending, the society sets a higher request to university students. English teaching is more than a language skills training. It must combine with society and cultures. Therefore, many universities start to open English elective course for the non-English majors. After a research and analysis of an investigation to the purposes of the courses and requirements of students, this paper finds that university students hope a continual English study at school. They approve these courses where they can learn both language and cultures. Taking one elective course, outlook on cultures, as an example, this paper tries to practice a new teaching method which may integrate teaching in traditional classroom, in audio-video classroom and in computer room effectively. It explores a better way to help students improve their comprehensive abilities of using English. It aims at making contributions to college teaching reform.
Keywords: higher education; college English; culture electives; reflection
 
Title: Investigation and design of quality evaluation system about PhD students in engineering fields
Authors: FAN Jianping, LI Shijun
PP: 477～481
Abstract: The paper highlighted the current shortage of PhD quality evaluation system and the importance and urgency of the correct evaluation. Based on extensive consultation and questionnaire, a perfect evaluation system aiming at the characteristics of the engineering profession was set up in order to estimate training quality both for PhD students and cultivating organization. The system is composed of three successive phases, including medium-term, graduation and post-graduation quality evaluation, each of which emphasizes the scientific, comprehensive and realizable principle. Moreover, the evaluation system consists in both qualitative and quantitative analysis. All the qualitative indexes are transformed into quantitative ones by correlative experts. After statistical analysis of quantitative indexes, the governors can perform the quality evaluation and present ultimate grade of any PhD student with the help of proposed evaluation system. At last, the paper presents an applied example of this quality evaluation system, which shows that the proposed system is objective, reasonable and easy to operate
Keywords: graduate education; quality evaluation system; evaluating index; PhD students
 
Title: Calculation research of the stress intensity factor based on the unified strength theory
Authors: ZHANG Zhigang, ZHAI Zhendong
PP: 471～476
Abstract: The Ⅰ-Ⅱ complex crack problems under the joint action of two-way stretch and shear stress are studied by using twin shear unified strength theory. Taking the impact of non-singularity of the stress on the crack-tip extended line of stress field near the tip of Ⅰ-Ⅱ complex crack into account, the unified strength formula containing parameters of difference in tensile and compressive properties and the intermediate principal stress effect is given. The mathematical expressions of the stress intensity factor KⅠ, KⅡ of the Ⅰ-Ⅱ complex crack are deduced through the equivalent stress αeq, τeq. KⅠ, KⅡ are gained through the gradual approach of crack-tip stress field. The results are in accordance with the results from analytic method.
Keywords: engineering mechanics; unified strength theory; complex crack; stress intensity factor; equivalent stress
 
Title: A non-homogeneous finite elastic deformation theory
Authors: QU Xiaozhang, ZOU Wennan, DONG Hong, CHEN Qingshi
PP: 463～470
Abstract: A non-homogeneous finite elastic deformation theory
Keywords: elastic deformation theory; couple stress; size sacle effect; gradient theroy
 
Title: Effects of solder joint shape on joint reliability
Authors: ZHANG Yu, YANG Xuexia, ZHAO Zhendong, SHU Xuefeng
PP: 456～462
Abstract: SnPb solder joints reliability under thermal cycling conditions(-55℃~125℃) were investigated in this paper, and the effects of solder joint shape (barrel, cylinder, hourglass) on joint reliability were analyzed for the same joint height and the same copper pad size. Finite element method was used to simulate the distribution of stress and strain of solder joints, and calculate the maximum of stress and strain under thermal cycling condition, the result showed that the outmost solder joints, the equivalent strain of which was maximum, were the most likely to crack. In addition, the fatigue lives of three kinds of solder joints mentioned above were predicted using a modified Coffin-Manson empirical equation and the value of the equivalent plastic strain based on the finite element result under thermal cycling condition, the result showed that hourglass solder joints have larger fatigue lives than the cylinder and barrel solder joints. The results provided a theoretical basis for the design of the solder joints shape for electronic packaging technology.
Keywords: solid mechanics; solder joints reliability; fatigue life; solder joints shape; finite element method; Coffin-Manson equation; thermal cycling
 
Title: Theoretical model and experiment on ice induced self excited vibration of vertical structures
Authors: GUO Fengwei, YUE Qianjin
PP: 450～455
Abstract: The two theoretical models on ice induced vibration of vertical structures: forced vibration and self excited vibration are discussed. By data analysis, the steady state vibration and frequency lock-in in phenomenon observed in Bohai Bay is proved to be self excited vibration. By further analysis, the mechanism of ice induced self excited vibration is presented, and frame of the dynamic equation is established. An example of the equation is given according to field data, phase plane analysis of the example is conducted. For verification of the theoretical model, some model tests were performed and satisfactory test result was obtained.
Keywords: engineering mechanics; self excited vibration; ice induced vibration; physical mechanism; dynamic equation; model test
 
Title: Stress analysis of soil base under different traffic loads
Authors: ZHU Dongfang, WANG Jingpeng, ZHENG Huihui, YIN Guansheng
PP: 442～449
Abstract: For different traffic loads, the stress distribution of the soil base course in the road structure is studied, with the finite element model established in the software of ANSYS. First, stress distribution of soil base under static load is simulated. And then transportation constant loads are used to simulate the traffic on the roads with smooth pavements. At last transportation harmonic loads are used to simulate the traffic on the roads with rough pavements. The results show that, the relation between car weight and the maximum Mises stress is in the linear law, and the same rule to Y direction of the stress when the load is static. Moreover, when the weight is constant and the load is dynamic, the maximum Mises stress decreases as the velocity increases, similar to a secondary trend. Furthermore, when the speed is certain, the maximum Mises stress increases as the weight increases, approximate to linear law. Through analyzing the calculation results, this paper gives all kinds of distribution of the stress in Matlab, and the results can provide the reference for the road design and construction.
Keywords: applied mechanics; soil base; stress; traffic loads
 
Title: Calculation studies on blow-off impulse of materials irradiated by pulsed X-ray
Authors: SHE Jinhu, TANG Wenhui
PP: 436～441
Abstract: Boiloff rule irradiated by soft X-ray is studied using numerical difference simulation method, two methods for calculating blow-off impulse are brought forward, and the rule of blow-off impulse and thickness as a function of original energy fluence is gained. The results indicate that blow-off impulse and thickness of Al increase linearly as original energy fluence increasing for irradiating by 1keV soft X-ray. The calculation results agree with what are gained by some experience formula and the results of experiment. Through analyzing the principle of two methods and each calculation parameters, it is shown that two methods can all calculate the blow-off impulse irradiated by soft X-ray, but the result gained by ∑pg(t)Δt method is more exact, and in accordance with practice better.
Keywords: engineering mechanics; X-ray; blow-off impulse; thermal shock wave; numerical simulation
 
Title: Numerical computational techniques on added mass of underwater vehicle with complex configuration
Authors: GUO Zhibin, DUAN Wenyang, ZHAO Binbin
PP: 428～435
Abstract: At present, the methods for computing the added mass of complicated objects are not too much. The added mass of a moving body is analyzed based on different techniques in this paper. Two methods are utilized to investigate the added mass of a body with six degrees of freedom when moving. One method is to calculate the forces of body vibrating in the unbounded fluid through the technique of dynamic mesh of software Fluent, and then the added mass is obtained through some transformations. Another method is to use the panel element method together with software Gambit to get the added mass based on potential flow theory. The results are presented and compared with the experiment results. The added mass of underwater vehicle with complex configuration is provided using these two techniques.
Keywords: fluid mechanics; numerical simulation; complex configuration; added mass; Fluent software