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1.
The work examines the feasibility of minimizing a linear objective function subject to a max-t fuzzy relation equation constraint, where t is a continuous/Archimedean t-norm. Conventional methods for solving this problem are significantly improved by, first separating the problem into two sub-problems according to the availability of positive coefficients. This decomposition is thus more easily handled than in previous literature. Next, based on use of the maximum solution of the constraint equation, the sub-problem with non-positive coefficients is solved and the size of the sub-problem with positive coefficients reduced as well. This step is unique among conventional methods, owing to its ability to determine as many optimal variables as possible. Additionally, several rules are developed for simplifying the remaining problem. Finally, those undecided optimal variables are obtained using the covering problem rather than the branch-and-bound methods. Three illustrative examples demonstrate that the proposed approach outperforms conventional schemes. Its potential applications are discussed as well.  相似文献   
2.
Plasmon (electrostatic) resonances are treated as an eigenvalue problem for specific boundary integral equation. This leads to direct calculation of resonance values of permittivity and resonance frequency. The technique is illustrated by numerical examples of calculation of resonance frequencies for 3D nanoparticles.  相似文献   
3.
针对溢洪道设计中经常遇到的方案优选问题,提出将多因素、多层次模糊优选理论引入溢洪道的设计选型工作中。对影响因素复杂、确定隶属函数主观因素较强的情况,引入因素的优先关系法来确定优选矩阵的隶属度,这样减少了确定隶属函数的人为影响,通过此优选模型利用影响溢洪道选型的主要因素对多种溢洪道设计型式进行了多级模糊综合优选决策,得到了比较理想的决策结果,为溢洪道设计选型提供了新的思路。  相似文献   
4.
在二元关系R的基础上构造了R^∞关系,给出并证明了R^∞关系的几个重要性质。这些性质在粗糙集理论中研究R^∞领域系统及其近似算子时甚为重要。  相似文献   
5.
This investigation was prompted by Asch's (1952) discussion of the personal and social significance of yielding to group pressure. For the person, yielding requires the inhibition of overt and perhaps implicit responses to objective situational requirements. For the group, malignant processes may arise and develop, unchecked by those members in whom goals of personal security predominate over group goals. In the present study, the view was taken that both meanings of yielding are assigned positive value in two separate ideologies concerning the group-individual relation. One of these is termed "conformity" and the other is "rugged individualism." In the study, group pressure was simulated by announcing bogus group judgments to small groups of Ss whose apparent task was to match one of three lines of variable length with a standard line. Questionnaires were used to measure variables, which were: the ideology of conformity (IC), the ideology of rugged individualism (RI), ethnocentrism (E), and authoritarianism (F). The questionnaires were administered to 91 college students, both day school and evening. It was found that the correlation with the F scale was .48 (P  相似文献   
6.
简述了桩身质量检测的常用方法及评判标准,采用主成分分析原理与关联度分析原理,结合搅拌桩检测资料,对影响桩身质量的因素进行了分析研究,得出了一些有价值的结论,对搅拌桩检测方法及评判标准的改进与完善具有参考意义.  相似文献   
7.
加筋土挡墙有限元分析材料模型综述   总被引:2,自引:0,他引:2  
对20世纪60年代以来国内外加筋土挡墙有限单元分析中采用的几种方法进行了简单介绍,并分别指出它们的优缺点。对加筋土结构有限元计算时经常采用的一些本构模型进行了详细介绍,并着重描述了一种可用于模拟接触面的结构性模型———复合体模型。目前加筋土挡墙的有限元模型基本上均是二维平面模型,建议计算工作者建立三维模型,并考虑筋———土、面板———土、基础———墙体之间相互作用。指出将基于微观理论的结构性模型用于模拟加筋土体,特别是筋———土接触面,是一个新的研究方向。  相似文献   
8.
We propose a new Geographic Information System (GIS) three-dimensional (3D) data model based on conformal geometric algebra (CGA). In this approach, geographic objects of different dimensions are mapped to the corresponding basic elements (blades) in Clifford algebra, and the expressions of multi-dimensional objects are unified without losing their geometric meaning. Geometric and topologic computations are also processed in a clear and coordinates-free way. Under the CGA framework, basic geometrics are con...  相似文献   
9.
In this work, the tungsten particulate reinforced Al2O3 dispersion strengthened copper base composites were successfully fabricated by using a vacuum hot-press sintering method. With the test temperature varying from 650 to 950 ℃ and the strain rate varying from 0.01 to 5 s-1, the W(50)/Cu-Al2O3 composites were isothermally compressed on a Gleeble-1500D thermal simulator. The true stress-strain curves of the W(50)/Cu-Al2O3 under different test conditions were obtained. The dynamic recrystallization of the W...  相似文献   
10.
Bulk ultrafine-grained nickel specimens having grain sizes in the range of 0.25-5 μm were consolidated by hot isostatic pressing technique. The resulting microstructures were characterized by transmission electron microscopy and X-ray diffraction analysis. Compression tests were carried out at room temperature and at strain rate of 1.6×10−4 s−1. It was found that the measured yield strength does not follow the Hall-Petch law as a consequence of the presence of oxide phase. Therefore, the use of micromechanics based model, which takes into account only the Hall-Petch relationship at grain level for predicting the grain sized effects on mechanical behavior of this kind of materials, is not accurate yet. In this study, a modification made to the generalized self-consistent model was proposed for studying both grain size and oxide phase dependence of ultrafine-grained materials behavior. Because of the novel modification, an optimization procedure with two steps was required to identify the parameters of micromechanical model. An acceptable agreement between experimental and numerical results was achieved. Moreover, the influence of texture on the yield strength and the application of the proposed model to the spark plasma sintering processed materials were also discussed.  相似文献   
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