C_7H_15自由基裂解反应机理及速率常数的理论研究

采用CBS-QB3方法构建了C7H15自由基裂解反应势能剖面。计算结果表明,4种不同构型的C7H15自由基(1-C7H15,2-C7H15,3-C7H15,4-C7H15)发生多种不同类型的β位断裂,裂解成C2—C6烯烃和新的自由基。新的自由基继续发生β位断裂,形成诸如CH3自由基以及CH2CH2、CH3CHCH2等烯烃。此外,利用VKLab程序包及Wigner校正模型在200~3 000 K温度范围内计算了4种C7H15自由基各类β位断裂反应速率常数。其中1-C3H7→C2H4+CH3反应速率常数的结果与试验结果非常吻合。     

海船尾气紫外强化有效氯一体化脱硫脱硝的研究

为控制船舶尾气中SO_x和NO_x等有害污染物的排放,符合国际海事组织和地方性的公约和法规要求,各国都在加紧研究船舶尾气的后处理技术。介绍了目前尾气脱硫脱硝后处理技术的现状和研究方向,提出紫外辐照强化有效氯氧化脱硫脱硝的一体化尾气处理新技术。建立了实验平台,设计了实验方法,描述了化学反应的机理。实验结果表明,氧化溶液在紫外辐照的环境下,在pH为3～10时,具有一定的氧化脱硫脱硝能力。在设定的实验条件下,对NO和NO_2的最高脱除率达到61%,对SO2的脱除率达到100%。此一体化脱硫脱硝新方案适用于海船环境,为船舶尾气后处理技术的研究提供了参考。     

捐赠期望落差、现金流权与企业应对策略

企业慈善捐赠金额低于预期（即捐赠期望落差）会降低企业合法性,企业如何应对是一个重要的理论和实践问题。基于中国上市公司2008~2018年的数据,探讨企业如何通过调整后续的企业社会责任行为来降低捐赠期望落差的负面影响。研究表明：捐赠历史和社会期望落差越大,企业越可能增加捐赠以消除负面影响;捐赠历史和社会期望落差对企业其他社会责任行为增加的影响不显著,说明企业不倾向于采用增加其他社会责任行为来降低捐赠期望落差带来的负面影响;不同类型捐赠期望落差对企业行为的影响强度不同：与捐赠历史期望落差相比,捐赠社会期望落差对捐赠增加的影响更强,但两者对于其他社会责任行为增加的影响没有显著差异;实际控制人的现金流权比例越高,对捐赠增加的成本越敏感,捐赠历史和社会期望落差对捐赠增加的影响越弱。上述结论将绩效反馈从财务绩效拓展到社会绩效,不仅丰富了绩效反馈和慈善捐增文献,而且对企业应对捐赠期望落差有重要启示。     

基于系统工程学理论的可持续住宅评价体系构建

本文在基于系统工程学理论研究的前提下,构建了可持续住宅评价体系,通过建立相应的数学模型和评价方法,对各种性能因素在不同阶段进行信息输入,经过分析、计算、评判、选择最优的实施方案,以达到住宅系统质量最优化、效益最大化、成本最低化的目的,实现其可持续发展的目标。     

Co-evolution:A New Perspective for Business Model Innovation

This paper combines the perspective of co-evolution with studies in the area of business model, reveals the phenomenon of business model co-evolution and explores the business model coevolution mechanism between firms through a case study. Findings and what other companies can learn from this study are as follows. Firstly, companies, be it leaders or not, can act as enablers for other party's business model innovation. Secondly, companies can enable each other's business model innovation by taking the perspective of business model co-evolution; Thirdly, the interdependence of the business model co-evolution process can be explained by the four levers named novelty, lock-in,complementarity and efficiency. Companies can select novelty, lock-in, complementarity, efficiency or the combination of the four as mediators to achieve business model co-evolution.     

Workload-aware request routing in cloud data center using software-defined networking

Large latency of applications will bring revenue loss to cloud infrastructure providers in the cloud data center. The existing controllers of software-defined networking architecture can fetch and process traffic information in the network. Therefore, the controllers can only optimize the network latency of applications. However, the serving latency of applications is also an important factor in delivered user-experience for arrival requests. Unintelligent request routing will cause large serving latency if arrival requests are allocated to overloaded virtual machines. To deal with the request routing problem, this paper proposes the workload-aware software-defined networking controller architecture. Then, request routing algorithms are proposed to minimize the total round trip time for every type of request by considering the congestion in the network and the workload in virtual machines(VMs). This paper finally provides the evaluation of the proposed algorithms in a simulated prototype. The simulation results show that the proposed methodology is efficient compared with the existing approaches.     

从系统的视角看我国教育法制建设的复杂性

我国教育法制建设是一项长期、复杂的系统工程。本文从系统的视角,浅析我国教育系统的复杂性;教育法制系统是一个开放的复杂系统,其复杂性与教育系统的复杂性密切相关;从系统的视角认识我国教育法制建设的复杂性是社会发展和现实生活的需要,也是完善我国教育法制建设的需要。     

New criteria on delayed state feedback stabilization for stochastic systems with time-varying delay

The problems of robust exponential stability in mean square and delayed state feedback stabilization for uncertain stochastic systems with time-varying delay are studied.By using Jensen’s integral inequality and combining with the free weighting matrix approach,new delay-dependent stability conditions and delayed state feedback stabilization criteria are obtained in terms of linear matrix inequalities.Meanwhile,the proposed delayed state feedback stabilization criteria are more convenient in application than the existing ones since fewer tuning parameters are involved.Numerical examples are given to illustrate the effectiveness of the proposed methods.     

Continuity of solution mappings for parametric generalized set-valued weak vector equilibrium problems

This paper obtains some stability results for parametric generalized set-valued weak vector equilibrium problem. Under new assumptions, which do not contain any information about solution mappings, the authors establish the continuity of the solution mapping to a parametric generalized set-valued weak vector equilibrium problem without monotonicity. These results extend and improve some results in the literature. Some examples are given to illustrate the results.     

Isogeometric Analysis-Based Topological Optimization for Heterogeneous Parametric Porous Structures

Porous structures widely exist in nature and artifacts, which can be exploited to reduce structural weight and material usage or improve damage tolerance and energy absorption. In this study,the authors develop an approach to design optimized porous structures with Triply Periodic Minimal Surfaces(TPMSs) in the framework of isogeometric analysis(IGA)-based topological optimization.In the developed method, by controlling the density distribution, the designed porous structures can achieve the opt...