正交试验法在QC小组活动中的应用

在QC小组活动的对策实施阶段,为了从4个要因所含的多个位级中找出最佳位级,利用正交试验法安排了4因素3位级的试验,并对试验结果通过＂直接看＂和＂按计算结果＂二种方法进行比较,选出较好的位级。同时由正交试验结论表对4因素作趋势分布图,结合趋势图和实际活动中位级的限制,进一步优选参数,进行第二次正交试验,找出每个因素的最佳位级。利用正交试验法提高了QC活动中运用工具的能力。     

光擦除双光束耦合理论和实验研究

建立了光擦除双光束耦合理论的简单模型,理论分析了其特性,用Ce:KNSBN晶体进行了实验研究。实验结果与理论分析定性符合很好。     

基于Simulink的外光反馈半导体激光器动态特性的模拟研究

文章提出了一种新的研究外光反馈半导体激光器动力学行为的方法,利用Simulink仿真软件建立可视化模型模拟了弱反馈至中等反馈下外光反馈半导体激光器的动态特性,结果表明弱反馈下系统处于周期态,增加反馈量系统的输出由周期态进入混沌态.并对用高频电流注入(HFI)技术控制外光反馈半导体激光器的混沌进行了模拟研究.与基于常规高级程序设计语言的计算机模拟技术相比,该方法避免了传统意义上的复杂算法编程和调试过程,可以方便的改变模型参数并观察到相应的模拟结果.     

不锈钢铝合金半固态连接工艺参数研究

By using semisolid joining technique,the bonding of stainless steel and semisolid aluminum alloy is successfully realized.The relationships between interracial shear strength and solid fraction of aluminum alloy,bonding pressure and time of keeping pressure were studied by the method of orthogonal experiment.The interfacial structure and the fracture structure of the bonding plate are studied by means of optical microscope (OM) and scanning electron microscope (SEM).The results show that there is the best solid fraction between the solid phase line and the liquid phase line of the semisolid aluminum alloy,with the increase of bonding pressure and pressure time,the interfacial shear strength increases rapidly,and then with further increase of bonding pressure and pressure time,the shear strength rises little.Along the interface,solid phase and liquid phase bond with stainless steel by turns because of the different diffusion ability.So,a new type of non-equilibrium diffusion interfacial structure is constructed at the interface of stainless steel and aluminum alloy,compound mechanism of plastic and brittle fracture interface was formed at the shear fracture interface.     

ACADEMIC DISHONESTY: A Zero Tolerance Professor and Student Registration Choices

College and university faculty and administrators are responsible for constructing academic honesty policies and communicating them to students. This is often attempted through institutional honesty policies and university-wide honor codes. While these approaches have been widely researched, less attention has been given to the role of individual faculty members. That role is examined in this study by addressing student reactions to professors based on their academic honesty policies. In addition to demographic information, data were gathered about student attitudes and beliefs concerning academic dishonesty and their decision to enroll in or avoid a course being taught by a professor with zero tolerance for academic dishonesty. The findings regarding different instructors’ approaches toward academic dishonesty indicate that an intolerant policy will keep dishonest students away, but at a price—it will also detract many honest students.     

酉空间的广义正交基

在酉空间中利用内积给出了广义正交基的概念，研究它与广义酉变换、酉矩阵之间的关系，获得了一些新的结果，推广了酉空间的规范正交基、酉变换等结果．     

微波合成苯甲酰苯胺的工艺研究

利用微波辐射,以苯胺、苯甲酸为原料合成了苯甲酰苯胺。利用正交实验设计法对影响收率诸因素进行了考察,确定最优工艺条件为：在微波功率200W下苯胺与苯甲酸的摩尔比（原料比）1：1.5、辐射时间5min、反应温度180℃。在此反应条件下,苯甲酰苯胺的收率达到了81.5％。与常规加热反应对比,采用新的微波法缩短了反应时间,提高了反应收率。     

谱线线型对双光干涉的影响

考虑实际光源所发出的谱线的几种基本线型：洛仑兹线型、高斯线型和综合加宽机制下的综合线型的双光干涉．导出了这几种线型的谱线的双光干涉强度和反衬度公式,揭示了不同谱线线型双光干涉强度和反衬度随光程差、谱线宽度的变化规律．研究表明,常规的根据平顶型线型反衬度为零对谱线相干长度的定义对实际的线型仅是近似的;在考虑取一定反衬度误差的条件下,给出采用平顶型这一近似的模型代替实际谱线的判据．     

砂带磨削参数对材料去除深度的影响

为探究金属工件在砂带磨削加工中的材料去除机理,对砂带磨削系统简化后建立几何模型,并设置模型参数及运动建立了砂带磨削加工的离散元动态仿真。仿真结果表明:通过单因子试验研究不同的磨削参数对材料去除深度(material removal depth, MRD)的影响规律?通过正交试验得到不同磨削参数对MRD 的影响贡献率,其中砂带转速的影响最大、其次是砂带进给量,同时得到磨削参数的最优组合为工件进给量为0.5 mm,砂带转速为1 800 r/ min,工件速度为40 mm/ s,水平夹角为40°;最后通过实验验证仿真结果与结论的正确性。     

Fast fault isolation and restoration of looped MV network

A new fault isolation and restoration technique employing local Ethemet network for the looped MV circuit is presented. It can isolate all short circuit faults in the loop within 300 ms and restore the supply of healthy sections in less than 1.2 s. A reliable fault location method of isolating the single phase-to-ground fault （SPGF） in the non-effectively earthed network, which makes use of the fault generated transient signals, is also proposed. And the method locates the SPGF by examining transient zero-mode current correlation, which is not influenced by the neutral grounding mode and need no additional device. Laboratory test and simulation results show the proposed techniques are feasible, and significantly improve the supply reliability.