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COOPERATIVE GAMES ON CONVEX GEOMETRIES WITH A COALITION STRUCTURE

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Journal of Systems Science & Complexity 2012年第5期25卷 909-925页

作者： Fanyong MENG qiang zhang School of Management Qingdao Technological University School of Management and Economics Beijing Institute of Technology

This paper is mainly to discuss cooperative games on convex geometries with a coalition structure, which can be seen as an extension of cooperative games with a coalition structure. For this kind of games, the cooperation among unions and within each union will be the convex sets, i.e., the feasible subsets of the coalition structure and that of each union belong to a convex geometry, respectively. The explicit form of the generalized Owen value for this kind of games is given, which can be seen as an extension of the Owen value. Eklrthermore, two special cases of this kind of games are researched. The corresponding Davoff indices are also stHdied. Fin~.llv ~n ilhl^r~＇i, ~r^l~ to ~

关键词： Coalition structure convex geometry cooperative game generalized Owen value gener-alized symmetric coalitional Banzhaf value.

The Fixed Subgroups of Homeomorphisms of Seifert Manifolds

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Acta Mathematica Sinica,English Series 2015年第5期31卷 797-810页

作者： qiang zhang School of Mathematics and Statistics Xi'an Jiaotong University

Let M be a compact connected orientable Seifert manifold with hyperbolic orbifold BM, and fπ ： π1 （M）→π1 （M） be an automorphism induced by an orientation-reversing homeomorphism f of M. We give a bound on the rank of the fixed subgroup of fπ, namely, rankFix（fπ）〈 2rankπ1（M）, which is an analogue of inequalities on surface groups and hyperbolic 3-manifold groups.

关键词： Seifert manifolds fixed subgroups homeomorphisms

A Description of Fixed Subgroups of Free Groups

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Chinese Annals of Mathematics,Series B 2016年第5期37卷 713-718页

作者： qiang zhang School of Mathematics and Statistics Xi’an Jiaotong University

Let F be a finitely generated free group. Martino and Ventura gave an explicit description for the fixed subgroups of automorphisms of F. The author generalizes their results to injective endomorphisms.

关键词： subgroups Fixed finitely automorphism explicit trivial isomorphic invariant integers argument

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退变性脊柱侧凸主弯区的退变程度分析

中国组织工程研究 2025年第15期29卷 3206-3214页

作者：王明朗蒋琳宋彬张力张强冯大雄资阳市雁江区人民医院脊柱外科四川省资阳市641300 西南医科大学附属医院脊柱外科四川省泸州市646000

背景:退变性脊柱侧凸的发病机制不清,主弯区非对称退变可能与侧凸发生、发展紧密相关,充分认识主弯区的退变有助于为临床治疗策略提供更多参考。目的:探讨退变性脊柱侧凸主弯区退变程度与脊柱骨盆参数之间的关系,了解其发病机制。方法:... 详细信息

背景:退变性脊柱侧凸的发病机制不清,主弯区非对称退变可能与侧凸发生、发展紧密相关,充分认识主弯区的退变有助于为临床治疗策略提供更多参考。目的:探讨退变性脊柱侧凸主弯区退变程度与脊柱骨盆参数之间的关系,了解其发病机制。方法:收集西南医科大学附属医院脊柱外科2018年7月至2023年11月就诊的退变性脊柱侧凸患者的病历及影像学资料。比较顶椎上、下关节突关节凹侧、凸侧关节炎的差异;分析脊柱侧凸严重程度、脊柱骨盆参数、关节突关节炎等参数之间的相关性;探究脊柱侧凸严重程度、脊柱骨盆参数、关节突关节炎等参数之间的影响作用。结果与结论:①在顶椎关节突关节中,凹侧比凸侧关节突关节炎严重,差异有显著性意义(P<0.001);在顶椎同侧(凹侧或凸侧)上关节突关节炎比下关节突关节炎严重,差异有显著性意义(P<0.001);②骨盆入射角随着腰椎前凸角减小而减小(rs=0.509,P<0.001);顶椎侧方骨赘差值随着腰椎前凸角减小而增加(rs=-0.285,P=0.033);关节突关节不对称角随着骨盆入射角减小而增加(rs=-0.379,P=0.004);③L5倾斜角、椎间盘角度是主弯Cobb角增大的危险因素(B=1.012,P<0.001;B=0.620,P=0.016);骨盆入射角是主弯Cobb角增大的保护因素(B=-0.264,P=0.003);④提示退变性脊柱侧凸顶椎区域凹侧退变程度重于凸侧;顶椎关节突关节不对称角及关节突关节炎严重程度与脊柱侧凸严重程度无明显相关性;腰椎前凸角和骨盆入射角在维持脊柱正常序列中发挥关键作用,且骨盆入射角是主弯Cobb角增大的保护因素;L5倾斜角和椎间盘角度是主弯Cobb角增大的危险因素。

关键词：退变性脊柱侧凸主弯区顶椎不对称退变关节突关节炎

Design of infrared camouflage cloak for underground silos

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Defence Technology（防务技术） 2020年第1期16卷 43-49页

作者： Luo zhang qiang zhang Hong Ye Department of Thermal Science and Energy Engineering University of Science and Technology of ChinaHefei 230027PR China

The temperature difference between the exposed surface of an underground silo and the surrounding soil surface is significant,which means a silo can be easily found by infrared *** designed an infrared camouflage cloak consisting of an imitative layer and an insulation layer for the *** imitative layer is used to imitate the thermal response of the soil to the surrounding *** insulation layer is used to weaken the impact of the internal temperature field of the silo on the lower boundary of the imitative layer.A silo model including surrounding soil and a soil model without silo were established,and the influences of the material and thickness of each layer on the infrared camouflage effect were *** results show that when using a silicone rubber containing alumina powder with a volume fraction of 3.18% as the imitative material,its thermal inertia is in consistent with that of the ***,it was found that the thickness of the imitative layer doesn't need to be greater than its thermal penetration depth to achieve the infrared camouflage,and the absence of the insulation layer will cause hot spots on the silo surface in winter to weaken the camouflage *** optimized thicknesses of the imitative layer and the insulation layer are 22 cm and 4 cm re *** simulations indicate that with the application of the cloak,the maximum value of the absolute values of the temperature differences between the average temperatures of the silo surface and the surrounding soil surface temperatures drops from 1,59℃ to 0.31℃ in summer and from 1.92℃ to 0.21℃ in *** designed cloak can achieve an all-weather and full-time passive infrared camouflage.

关键词： Underground silo Infrared camouflage cloak Imitative layer Insulation layer

Practical fuel cells enabled by unprecedented oxygen reduction reaction on 3D nanostructured electrocatalysts

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Journal of Energy Chemistry 2020年第9期29卷 107-108,I0003页

作者： Hong Yuan qiang zhang Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

Oxygen reduction reaction(ORR)is of significance for energy conversion technologies such as fuel cells and metal-air batteries[1,2].Currently,the electrocatalysts still need to employ expensive precious metal platinum... 详细信息

关键词： Oxygen reduction reaction Fuel cells Precious metal electrocatalyst 3D nanostructured materials Electrocatalysis

GENERALIZED INTUITIONISTIC FUZZY HYBRID CHOQUET AVERAGING OPERATORS

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Journal of Systems Science and Systems Engineering 2013年第1期22卷 112-122页

作者： Fanyong MENG qiang zhang School of Management Qingdao Technological University Department of Management and Economics Beijing Institute of Technology

In this study a new hybrid aggregation operator named as the generalized intuitionistic fuzzy hybrid Choquet averaging（GIFHCA） operator is ***,some desirable properties are studied, and several important cases are ***,we define the generalized Shapley GIFHCA （GS-GIFHCA） operator,which does not only overall consider the importance of elements and their ordered positions,but also globally reflect the correlations among them and their ordered *** order to simplify the complexity of solving a fuzzy measure,we further define the generalizedλ-Shapley GIFHCA（GλS-GIFHCA） operator.

关键词： Multi-attribute group decision making intuitionistic fuzzy set Choquet integral generalized Shapley function fuzzy measure

Fuzzy Nash equilibrium of fuzzy n-person non-cooperative game

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Journal of Systems Engineering and Electronics 2010年第1期21卷 47-56页

作者： Xiaohui Yu qiang zhang School of Management and Economics Beijing Institute of Technology Beijing 100081 P. R. China

The fuzzy non-cooperative game with fuzzy payoff function is studied. Based on fuzzy set theory with game theory, the fuzzy Nash equilibrium of fuzzy non-cooperative games is proposed. Most of researchers rank fuzzy number by its center of gravity or by the real number with its maximal membership. By reducing fuzzy number into a real number, we lose much fuzzy information that should be kept during the operations between fuzzy numbers. The fuzzy quantities or alternatives are ordered directly by Yuan＇s binary fuzzy ordering relation. In doing so, the existence of fuzzy Nash equilibrium for fuzzy non-cooperative games is shown based on the utility function and the crisp Nash theorem. Finally, an illustrative example in traffic flow patterns of equilibrium is given in order to show the detailed calculation process of fuzzy Nash equilibrium.

关键词： operational research Nash equilibrium preference relations fuzzy game theory.

A new simpler rotation/curvature correction method for Spalart-Allmaras turbulence model

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Chinese Journal of Aeronautics 2013年第2期26卷 326-333页

作者： zhang qiang Yang Yong National Key Laboratory of Science and Techniques on Aerodynamic Design and Research Northwestern Polytechnical University

A new and much simpler rotation and curvature effects factor, which takes the form of Richardson number suggested by Hellsten originally for SST k-ω model, is presented for Spalart and Shur＇s rotation and curvature correction in the context of Spalart-Allmaras （SA） turbulence model. The new factor excludes the Lagrangian derivative of the strain rate tensor that exists in the SARC model, resulting in a simple, efficient and easy-to-implement approach for SA turbulence model （denoted as SARCM） to account for the effects of system rotation and curvature, techniquely. And then the SARCM is tested through turbulent curved wall flows： one is the flow over a zeropressure-gradient curved wall and the other is the channel flow in a duct with a U-turn. Predictions of the SARCM model are compared with experimental data and with the results obtained using original SA and SARC models. The numerical results show that SARCM can predict the rotation-curvature effects as accurately as SARC, but considerably more efficiently. Additionally, the accuracy of SARCM might strongly depend on the rotation-curvature model constants. Suggesting values for those constants are given, after some trials and errors.

关键词： Accuracy Computation Curvature Improvement Robust Rotation Strain rate tensor Turbulence model