基于演化博弈的公共交通、共享汽车与私家车的博弈分析

出行者的选择行为分析是交通系统中的一项重要内容,随着城市的发展,交通出行方式大体分为三大类:公共交通出行、辅助公共交通出行和私人交通出行。本文在以往的研究基础上,采用演化博弈的方法研究公共交通、共享汽车以及私家车三者之间的博弈关系,模拟出行者的选择行为,分析博弈均衡点稳定性及参数条件。通过模型仿真实验,演化结果中各项比例大小取决于各项收益、补贴、损失以及额外收益,要增加公共交通的配套设施,增收拥堵费以及增加对共享汽车的补贴及配套服务。     

磁性壳聚糖微球的制备及其用作漆酶固定化载体

磁性壳聚糖微球的制备及其用作漆酶固定化载体;壳聚糖;固定化;漆酶;酶活力     

面向产业集群的协同商务系统构建研究

将协同商务应用于产业集群,可进一步提升集群整体的竞争能力。本文分析了协同商务为产业集群带来的优势,提出了一种用于描述产业集群协同商务的运营结构框架。基于该框架,从构建智能化搜索引擎系统、支持企业互操作的应用服务环境和协同商务信息门户三方面探索了构建产业集群协同商务系统的实现方案。     

Surface Structure and Electronic Property of InP（001）-（2×1）S Surface： A First-Principles Study

The surface structure and electronic property of InP（001）-（2 ×1）S surface under S-rich condition are investigated based on first-principles simulations. The analyses of phase transition show that the 3B model is the most stable structure and the S-S dimer is difficult to form. The geometry of the 3B structure agrees well with the experiments. It is also found that the 3B structure has a good passivation with a band gap of about 1.24eV. The results indicate that the 3B structure is the best candidate for the sulfur-rich InP（001）（2 × 1）A phase.     

含氮烃基膦酸的合成(Ⅳ)——以环丁砜作溶剂直接合成N-烃基-α-氨基苄基膦酸

具有生物活性的 α-氨基烃基膦酸的合成有过报道^[1], 而氮烃基-α-氨基烃基膦酸的合成报道较少. 应用醛、苄胺与亚磷酸酯反应后在强酸条件下水解得到取代的 α-氨基烃基膦酸^{[2, 3]}.IssIeib用三甲基硅基膦酸与席夫碱加成然后再水解^[4]. 这些方法尽管得到相应的膦酸产物,但它的水解却需要较长时间。     

First-principles study of stability of point defects and their effects on electronic properties of GaAs/AlGaAs superlattice

When the GaAs/AlGaAs superlattice-based devices are used under irradiation environments, point defects may be created and ultimately deteriorate their electronic and transport properties. Thus, understanding the properties of point defects like vacancies and interstitials is essential for the successful application of semiconductor materials. In the present study, first-principles calculations are carried out to explore the stability of point defects in GaAs/Al_0.5Ga_0.5As superlattice and their effects on electronic properties. The results show that the interstitial defects and Frenkel pair defects are relatively difficult to form, while the antisite defects are favorably created generally. Besides, the existence of point defects generally modifies the electronic structure of GaAs/Al_0.5Ga_0.5As superlattice significantly, and most of the defective SL structures possess metallic characteristics. Considering the stability of point defects and carrier mobility of defective states, we propose an effective strategy that Al_As, Ga_As, and Al_Ga antisite defects are introduced to improve the hole or electron mobility of GaAs/Al_0.5Ga_0.5As superlattice. The obtained results will contribute to the understanding of the radiation damage effects of the GaAs/AlGaAs superlattice, and provide a guidance for designing highly stable and durable semiconductor superlattice-based electronics and optoelectronics for extreme environment applications.     

Structures and vibrational frequencies of CO adlayers on Rh(111) surface

The adsorption of carbon monoxide on single-crystal transition metal surfaces has been the subject of numerous studies, because it has served as a model system for the adsorption of small molecules on transition metal surfaces, and its industrial importance is obvious in such areas as catalytic reaction. The bonding of carbon monoxide to rhodium is of special interest since this metal catalyzes the hydrogenation of CO to produce hydrocarbons in both heterogeneous and homogeneous media, and it …     

一个新的交通网络平衡设计模型及其算法

针对城市道路网络改造问题中，待改造道路和拟添加道路均具有等级选择的特点，提出了一种更加符合实际的新的网络平衡设计二层规划模型，设计了粒子群求解算法，并给出了一个简单的算例，实际算例表明该算法具有计算简单，收敛速度快的特点．     

基于多传感器信息融合的酒类辨识方法研究

尝试利用主成分分析(PCA)和人工神经网络(ANN)中改进的BP算法、改进的RBF算法(最近邻RBF与k均值RBF相结合选取中心的算法)和k均值RBF算法结合多传感器信息融合技术,实现对酒类的定性识别。实验结果表明:利用信息融合,结合PCA的ANN方式为模式识别、分类提供了快速准确的辨识方法。     

有限注意力下一类满意启发式决策的建模与理性分析

在决策者有限注意力下,现实生活中决策人的选择行为往往表现出一类“满意启发式”特征。基于个体决策者偏好的不完备性,借助方案集系列、考虑集等相关概念探讨了满意启发式决策规则的建模;论证了方案集系列可观与部分可观条件下一类满意决策函数的存在性,以及基于相关理性条件的理性特征,并结合顾客购买行为案例的仿真实验对所建立的满意决策模型进行了验证。仿真结果表明决策者在时间紧逼和信息不完整的情形下可以通过排除部分方案的方式保证以最大概率选到满意方案。研究结果可为现实生活中决策人在时间紧迫、信息缺失等情形下的选择提供一定的理论参考与指导,也可作为一类满意决策研究的理论基础。