时变情境下的企业应急决策矛盾问题分析与求解

企业应急决策是一个充满变化、矛盾冲突的,涉及多个领域知识的复杂决策过程,能否根据突发事件的发展过程,依照具体的决策情境有效地整合企业可利用的资源条件,化解应急决策过程中的矛盾问题冲突,生成有效的应急决策方案,成为制约应急决策有效性的难点.为此,将可拓学中转换桥方法引入应急决策,研究变化情境下的应急决策矛盾问题分析与求解.针对变化情境下企业应急决策矛盾问题进行形式化基元模型表达,构建了矛盾问题定量描述与求解的转换桥共存度函数和转换桥可拓变换函数,并给出了基于转换桥模型的矛盾问题求解策略.并以某手机制造企业为例,随着突发事件的发展变化,分析企业可利用资源和应急决策过程中的矛盾问题,并进行求解.经验证,所提方法对于分析和解决应急决策过程中不同领域知识之间的对立冲突问题是有效的.     

电桥法测电阻综述

本文对测量电阻的多种电桥法进行了介绍，并分析了各种方法的使用范围及改进方法。     

预应力CFRP板平板锚具承载力评估理论与试验研究

为揭示CFRP板平板锚具的锚固机理, 建立了该锚具的承载力理论模型, 并利用该模型预测CFRP板平板锚具的临界锚固长度. 通过试验获得了模型所需的锚固界面剪应力与压应力的关系式. 该模型研究了锚固区界面剪应力的纵向折减及横向压应力分布的不均匀性, 并通过试验测得了界面剪应力的纵向折减系数. 利用上述模型就平板锚具设计参数对锚固性能的影响进行了分析. 结果表明, 界面剪应力折减率随着锚固长度的增大而增大, 横向压应力分布的不均匀性随着锚固宽度的增大而增大, 增大界面压应力和夹板厚度能有效提高横向压应力分布的均匀度; 临界锚固长度随夹板厚度的增大而减小, 且当夹板达到合适厚度后继续增大, 对临界锚固长度的影响逐渐变小; 随着界面压应力的增大, 界面剪应力增大, 临界锚固长度减小; 对于工程常用CFRP板尺寸100mm×2.0mm, 当界面压应力取100MPa, 平板锚具夹板厚度取32mm时, 所需的临界锚固长度为296mm, 对应的锚具设计承载力为480kN, 理论上能使CFRP板抗拉强度获充分发挥.     

半穿式桁架桥上弦杆侧向稳定性计算方法的研究

在实际工程设计的过程中，发现我国《港口工程技术规范》（１９８７年）对半穿式桁架钢引桥上弦杆的稳定承载力计算存在一些不合理之处，以横向弹性约束杆为模型，以能量法为手段，推导了半穿式桁架桥上弦杆侧向屈曲的稳定方程，并通过函数逼近，给出了简便、实用的上弦杆稳定承载力的计算公式。     

鄞县二桥稳定性分析

对国内少见的飞燕式、三片拱钢管混凝土系杆拱桥--鄞县二桥进行基于空间建模的稳定性分析.分别进行了线弹性、弹性大变形及弹塑性大变形的稳定计算,考虑荷载布置、拱肋初始几何缺陷、预应力等因素的影响,总结了些有益的结论,对该类桥梁的建设有一定参考价值.     

比较AI6000-D智能仪和QS1在介质损耗上的测量

测量介质损耗是高压电气测量绝缘的基础试验.然而,从测量精度上、测量环境和测量时间上讲,现在用传统的方法和仪器测量已不能满足试验人员的测量要求.通过现代自动抗干扰精密介质损耗测量仪A I6000-D和传统的高压西林电桥Q S1对电压互感器(变比6 000V/100V)进行介质损耗测试结果的比较,智能仪A I6000-D的优势卓然而出.     

基于改进型事件树分析法的桥梁事故分析

将改进型事件树分析法应用于桥梁事故分析中,该方法系统考虑所有可能引起事故发生的原因及机理,并形成事故分析所需的事件树和确定事故方案.通过对各种事故方案进行仿真计算,找出事故原因及机理.结合大桥施工阶段的事故分析表明,该方法对桥梁事故分析较为可行.     

Electrohydrodynamic cone-jet bridges: Stability diagram and operating modes

An electrohydrodynamic cone-jet bridge is formed when two opposing Taylor cones are bridged by a liquid jet. We used high-speed video imaging to systematically investigate the operating regimes of the cone-jet bridge established between a nozzle and a liquid pool that were closely separated. There was a stability island for the cone-jet bridge in the voltage-flow rate operating diagram, and the stable bridge could only be formed above a minimum flow rate and at an intermediate range of voltages. In the vicinity of the stability island, the cone-jet bridge broke up via a thinning or beading mode.     

Synthesis and electrochromic properties of triphenylamine containing copolymers: Effect of π‐bridge on electrochemical properties

In this study, a series of benzotriazole (BTz) and triphenylamine (TPA)‐based random copolymers; poly4‐(5‐(2‐dodecyl‐7‐methyl‐2H‐benzo[d][1,2,3]triazol‐4‐yl)thiophen‐2‐yl)‐N‐(4‐(5‐methylthiophen‐2‐yl)phenyl)‐N‐phenylaniline ( P1 ), poly4′‐(2‐dodecyl‐7‐methyl‐2H‐benzo[d][1,2,3]triazol‐4‐yl)‐N‐(4′‐methyl‐[1,1′‐biphenyl]‐4‐yl)‐N‐phenyl‐[1,1′‐biphenyl]‐4‐amine ( P2 ), and poly4‐(5′‐(2‐dodecyl‐7‐(5‐methylthiophen‐2‐yl)?2H‐benzo[d][1,2,3]triazol‐4‐yl)‐[2,2′‐bithiophen]‐5‐yl)‐N‐(4‐(5‐methylthiophen‐2‐yl)phenyl)‐N‐phenylaniline ( P3 ) were synthesized to investigate the effect of TPA unit and π‐bridges on electrochemical and spectroelectrochemical properties of corresponding polymers. The synthesis was carried out via Stille coupling for P1 , P3 , and Suzuki coupling for P2 . Electrochemical and spectral results showed that P1 has an ambipolar character, in other words it is both p‐type and n‐type dopable, whereas P2 and P3 have only p‐doping property. Effect of different π‐bridges and TPA unit on the HOMO and LUMO energy levels, switching time, and optical contrast were discussed. All polymers are promising materials for electrochromic devices. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014 , 52, 537–544     

A new double asymmetric μ 1,1-azido bridged binuclear copper(II) complex: crystal structure and magnetic properties

A new double asymmetric μ_1,1-azido bridged binuclear copper(II) complex, [Cu₂(μ_1,1-N₃)₂(Him2-py)₂(N₃)₂] (Him2-py?=?2-(2′-pyridyl)-4,4,5,5-tetramethylimidazoline-1-hydroxy), has been synthesized and characterized structurally and magnetically. The crystal structure shows this complex is binuclear with copper(II) in a distorted square-pyramidal geometry, bridged by double asymmetric end-on azide ligands. The variable temperature magnetic susceptibility analyses reveal weak antiferromagnetic interaction mediated by the bridge.