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1.
An approach for shape optimization of stratosphere airships based on multidisciplinary design optimization 总被引：1，自引：0，他引：1
Airship shape is crucial to the design of stratosphere airships. In this paper, multidisciplinary design optimization （MDO） technology is introduced into the design of airship shape. We devise a composite objective function, based on this technology, which takes account of various factors which influence airship performance, including aerodynamics, structures, energy and weight to determine the optimal airship shape. A shape generation algorithm is proposed and appropriate mathematical models are constructed. Simulation results show that the optimized shape gives an improvement in the value of the composite objective function compared with a reference shape. 相似文献
2.
GAN Tian-meng 《重庆大学学报(英文版)》2015,14(4):147-154
Air quality has a significant relationship with our life. Residents are concerned with the environment issue of Chongqing, which used to be one of major industrial cities in China. We choose the air quality of Chongqing as the research object, valued by choice experiment model with designed questionnaires, to discuss the best approach of improving the air quality. Firstly, the paper introduces the representative methods of the stated preferences: CVM and choice experiment (CE). The choice experiment (CE) could be designed in a series of situations with many different attributes to test the relative values among the attributes, which are the evidences of ranking importance of the attributes. Because the improvement of air quality is affected by multiple factors, the technique is better at valuing the economical impacts. Once the attributes and levels are decided, profiles and choice sets can be designed. We can also collect data through questionnaires and use the conditional logit model to evaluate the improvement of air quality in Chongqing. The result shows the relative importance of the elements selected to evaluate the improvement of urban air quality. In a word, this research has important practical value to better the air quality. 相似文献
3.
TAO Feng-ming MENG Wei-dong 《重庆大学学报(英文版)》2006,5(1):57-62
Based on probing into the literature on multinational enterprise （MNE） staffing, we set up a concept model for MNEs＇ subsidiary staffing by two groups of influencing factors： the national differences bwteen the parent country and the host country, and the strategies employed by MNEs. We also tested the model and proposed propositions by a sample evaluation method, specifically with 1 000 copies of questionnaires given out to managers or directors of MNEs＇ subsidiaries in China Mainland and resulting in 151 sets of valid answers. The empirical study supports that national differences between the parent country and the host country and the strategies employed by MNEs do have impact on the subsidiary staffing, and MNE headquarters should make different staffing plans according to the difference of nations and strategies. We welcome testing our model by peer researchers in other country. 相似文献
4.
Axiomatic design （AD） and theory of inventive problem solving （TRIZ） are widely used in conceptual design. Both of them have limitations, however. We presented an integrated model of these two methods to increase the efficiency and quality of the problem solving process for conceptual design. AD is used for systematically defining and structuring a problem into a hierarchy. Sometimes, the design matrix is coupled in AD which indicates the functional requirements are coupled. TRIZ separation principles can be used to separate non-independent design parameters, which provide innovative solutions at each hierarchical level. We applied the integrated model to the heating and drying equipment of bitumen reproduction device. The result verifies that the integrated model can work very well in conceptual design. 相似文献
5.
Quality function development (QFD) matrix was introduced as a tool to measure the quality management performance of contractors. Engineering quality, quality management system components, and their relationship were defined. An integrated engineering quality system was decomposed into seven factors and the quality management system was composed of eight factors. Importance weights of all factors and their relationship point were acquired by questionnaires and interviews. Then, QFD matrix was formulated and the calculating process was proposed. This model was verified on a case study. The result shows that it is useful for contractor in benchmarking themselves and invaluable for owners in the process of deciding contractor. 相似文献
6.
Curriculum design is an aspect of education profession which focuses on developing curricula for students.Educators will take many factors in consideration when design a curriculum.In practical teaching,teacher as decision makers to design an appropriate curricu lum and teaching activities play an important part in the whole teaching and learning.Many classroom teachers are working with students of different levels of ability,and they need to be able to adjust the curriculum to keep all of the students engaged and learning.It may also be necessary to change the pace of a curriculum to deal with problems as they arise.The essay analyse five parts in designing the curriculum as a teacher decision maker and get a conclusion according to the whole analysis course. 相似文献
7.
This paper explores the teaching methods of Tourism English in Tianhua College.The teacher adopts both behaviorist and constructivist teaching methods in the experimental teaching for continuous three weeks.After the teaching experiment,questionnaires and interviews were done to find the result of the teaching effect.Both teaching methods are not perfect.The paper concludes that each method has its advantages.The most favored implementation should be a combination of both.We need to make the best of their advantages and avoid their weaknesses in order to achieve the best teaching effect. 相似文献
8.
In recent years,a large number of dialect words merged with Chinese mandarin,becoming a main source of Chinese new words and contributing to the diversity of Chinese.Targeting this phenomenon,the researchers conducted research on those words.By studying literature,sending out questionnaires,making field trips and observations,this paper analyzes the main factors influencing the dialect words’absorption in Chinese mandarin and the channels involved,summarizes the traits of their formula tion. 相似文献
9.
We conducted two-stage acidification-bioleaching experiments to probe the feasibility of bioleaching for a kind of mixed alkaline copper oxide and sulphide mineral. We used the uniform design method for data analysis and experimental optimization, with initial pH value, pulp density, inoculation of bacteria and ferrous iron concentration selected as the influential factors. Polynomial regression shows that the four factors sequentially influence the copper recovery by 14.430%, 8.555%, 1.982% and 3.895%. Acid equilibrium in the bioleaching system is mainly influenced by alkaline gangue content, chemical reactions and bacterial activity. A maximal portion of refractory copper extracted reaches 71.08%. The dynamic analysis of copper recovery indicates that bioleaching goes through a lag leaching phase, prime leaching phase and leaching stationary phase corresponding to the growth phases of bacteria. Compared with the predicted value of 80.87%, the confirmatory experiment observes a 78.21% copper recovery under the optimal conditions of pH of 1.5, pulp density of 5%, bacteria inoculation of 30% and initial ferrous iron concentration of 9 g L^-1. Results suggest that bioleaching is technically feasible to improving total copper recovery. 相似文献
10.
This paper investigates the scaled prediction variances in the errors-in-variables model and compares the performance with those in classic model of response surface designs for three factors.The ordinary least squares estimators of regression coefficients are derived from a second-order response surface model with errors in variables.Three performance criteria are proposed.The first is the difference between the empirical mean of maximum value of scaled prediction variance with errors and the maximum value of scaled prediction variance without errors.The second is the mean squared deviation from the mean of simulated maximum scaled prediction variance with errors.The last performance measure is the mean squared scaled prediction variance change with and without errors.In the simulations,1 000 random samples were performed following three factors with 20 experimental runs for central composite designs and 15 for Box-Behnken design.The independent variables are coded variables in these designs.Comparative results show that for the low level errors in variables,central composite face-centered design is optimal;otherwise,Box-Behnken design has a relatively better performance. 相似文献
11.
杨莹华 《齐齐哈尔师范高等专科学校学报》2012,(1):1-2
现今社会,随着经济的飞速发展,人际交往也日益频繁,良好的人际交往能力也成了人们社会生存所要具备的重要因素之一。面时复杂的社会现实,伴着形形色色的诱惑和欲望,人际交往过程中,出现了种种信任缺失的行为现象。因此,建立完善的信任机制,是人际交往面临的一大社会问题,也是社会发展中人际交往走向成熟的重要标签。 相似文献
12.
大学生人际信任研究 总被引：1，自引：0，他引：1
石梅 《延安教育学院学报》2010,24(1):22-24
大学生的人际信任水平是影响其心理素质高低不可忽视的因素,对其身心健康及其发展都有积极影响。采用Rotter编制的人际信任量表调查大学生人际信任的现状,分析大学生人际信任的特点及其差异,并探讨其形成原因及影响因素,旨在为提高大学生的人际信任水平,进而为提高大学生的社会适应力提供一些依据。 相似文献
13.
Christine E. Wade Bruce A. Cameron Kari Morgan Karen C. Williams 《Distance Education》2011,32(3):383-396
Trust between group members has been suggested as an important part of small group work in online classrooms. Developing interpersonal relationships with group members may promote a sense of trust among them; however, research shows mixed results. The current study explored how students’ perceptions of the importance of interpersonal relationships in online groups affected their perceptions of trust and experiences within the group. Students enrolled in online classes that incorporated a group project were surveyed about their experiences with online group projects. Participants did not find interpersonal relationships as necessary in trust development. However, student gender and type (i.e., distance versus on-campus) were important factors in determining the type of experiences students had within their online groups. Males reported more negative experiences than females, and distance education students desired relationships with group members more than on-campus students. 相似文献
14.
通过对大学生社会支持与人际信任相关研究的探讨,进一步了解大学生的社会支持与人际信任水平及二者的关系。主要采用问卷法,辅以文献法等方法,对150名大学生的社会支持、人际信任水平以及二者之间的关系进行了研究。结果表明:在社会支持量表上,大学生性别与年级对社会支持水平的影响显著,生源地与是否为独生子女对社会支持的水平影响并不显著;在人际信任量表上,大学生性别与生源地对人际信任的影响并不显著,年级与是否为独生子女对人际信任的影响显著;大学生人际信任和社会支持总分、客观支持、主观支持和支持利用度存在显著正相关。 相似文献
15.
Fan Li Prashant Loyalka Hongmei Yi Natalie Johnson Scott Rozelle 《School Effectiveness & School Improvement》2013,24(4):545-572
ABSTRACTThe goal of this paper is to describe and analyze the relationship between ability tracking and student social trust, in the context of low-income students in developing countries. Drawing on the results from a longitudinal study among 1,436 low-income students across 132 schools in rural China, we found a significant lack of interpersonal trust and confidence in public institutions among poor rural young adults. We also found that slow-tracked students have a significantly lower level of social trust, comprised of interpersonal trust and confidence in public institutions, relative to their fast-tracked peers. This disparity might further widen the gap between relatively privileged students who stay in school and less privileged students who drop out of school. These results suggest that making high school accessible to more students may improve social trust among rural low-income young adults. 相似文献
16.
采用《社会支持量表》和《人际信任量表》对唐山市几个社区的居民进行了调查,旨在探讨社区居民人际信任和社会支持存在的状况及之间的关系。研究结果表明：（1）唐山市社区居民的社会支持水平处中等水平,并存在性别、收入稳定性、婚姻及子女状况的差异;（2）唐山市社区居民的人际信任水平处中等水平,并存在性别、收入稳定性及子女状况的差异;（3）高社会支持水平的社区居民与中等以下社区支持水平的居民人际信任水平存在非常显著的差异。 相似文献
17.
为探讨不同区域被试影响人际信任的相关因素,采用由Rempel和Holmes（1986）编制的人际信任量表（TrustScale）,对来自甘肃和内蒙古的265名被试进行测评分析．结果表明：本研究的均值略高于常模;性别与可依靠性、人际信任总分达到显著性水平;城乡被试在人际信任各因子以及总分上没有显著差异;省区因素在人际信任各因子和人际信任总分上有显著差异,并且甘肃省被试人际信任度明显高于内蒙古被试． 相似文献
18.
Although there are research findings supporting the positive effects of computer-supported collaborative learning (CSCL), problems have been reported regarding the learning process itself, group formation, and group dynamics. These problems can be traced back to impeded social interaction between group members. Social interaction is necessary (a) for group members to learn from each other in a CSCL environment and (b) for socioemotional processes to help create a social space where trust, sense of community, and strong interpersonal relationships exist. This article introduces a theoretical framework consisting of three core elements: sociability, social space, and social presence, along with their relationships with group members’ mental models, social affordances and learning outcomes. It postulates that the three core elements influence the social interaction needed for both learning and the emergence of a social space. This framework serves as a basis for a research agenda for systematic social CSCL research. 相似文献
19.
杨雅厦 《泉州师范学院学报》2014,(1):116-120
目前的中国,在政府和民众之间、市场各利益主体之间,以及一般社会成员之间都出现了比较严重的信任问题。究其原因,与我国政治体制改革和经济体制改革的不同步发展有关,也与转型过程中传统的人格信任无法满足现代社会的需要而满足现代社会需要的制度信任出现了失序有关。因此,要治理当前我国社会信任问题,必须着力于经济体制改革的完善和政治体制改革的推进,切实转变政府职能、规范政府行为,健全法治,推进社会信用体系建设,加强对公民的信任教育等。 相似文献
20.
陶婉 《宁波教育学院学报》2010,12(2):26-29
采用人际信任量表和社会支持评定量表对安徽师范大学160名大学本科学生进行测查,用以探讨大学生人际信任与社会支持的关系。结果表明:性别与出生地对于人际信任的影响并不显著;是否为独生子和年级对于人际信任的影响显著;大学生的人际信任与社会支密切相关;回归分析表明,社会支持和主观支持均能预测大学生人际信任,表明社会支持是影响人际信任的重要因素。 相似文献