岸吊焊缝裂纹分析与改进措施研究

从材料的焊接性能、焊接结构、焊条、预热与焊后热处理、焊接工艺参数等角度对岸吊胎架焊缝裂纹进行了分析,提出了改进措施,取得了良好的效果。     

Sr对高铁Al-Si合金组织和性能的影响

研究了Sr元素（加入量分别为0．03％、0．06％、0．09％、0．12％和0．18％）对含Fe量为1．2％的ZL102合金的组织和性能的影响。研究发现，随着Sr元素的加入，合金中粗大的针状Fe相开始出现断裂分叉现象，同时针状Fe相的长度也随Sr元素加入量的增加而减小，但Sr对Fe相的针状形貌没有明显改变。随着Sr元素加入量逐渐增加，合金的抗拉强度和伸长率均呈现出先增后减的变化趋势。当Sr元素加入量达到0．12％时，合金材料的综合力学性能最佳。     

Performance of positive and negative electrodes in amorphous manganese oxide supercapacitor

Using potassium permanganate and acetic manganese as the reactants, amorphous manganese oxide was prepared with mechanochemical method. XRD was used for microstructure characterization, while cyclic voltammetry and constant current charge-discharge were used for electrochemical performance testing. The positive electrode （PE） and negative electrode （NE） were investigated respectively in amorphous manganese oxide supercapacitor, aiming to find their different performances in charging-discharging. The results show that the crystalline structure is destroyed in both the PE and NE material during charge-discharge process. Thereinto, the NE suffers a bit more seriously. When cycling, the PE potential scope diminishes while the NE potential scope enlarges. The increased inner resistance makes the NE curves almost bended to be a right angle, but not the PE curves. The cell＇s equivalent series resistance （ESR） is more dependent on the NE, and the capacitance is mainly determined by the rapid descent of the NE potential range. The capacitances of the NE are highly rate-dependent, decreasing from 121.3 to 53.1 F/g, by 56.2%, over the range of 5-25 mV/s. However, the PE appears to be weakly dependent and its capacitance is only dropped by 22.1%.     

基于微课的计算机类教育模式创新研究——以PHP程序设计为例

程序设计是计算机软件类专业中的重要环节及必修课程,无论是最早的VB、C、C++,还是现在非常流行的JAVA、C#、PHP,在整个教学过程中,学生会面临内容枯燥、乏味,概念抽象,知识构建产生困难等现象。而"微课"以短小精悍,表现内容丰富等特点诞生,其实际应用中往往是为了解决某个疑难知识点或将枯燥的内容情景化而制作的微视频。本文将着重分析目前高校程序设计教学现状和难点,以及微课的特点和优势,以PHP程序设计为例,探讨微课在计算机类教育创新研究中的应用。     

Virtual-Point-Based asymptotic tracking control of 4WS vehicles

This paper studies the lateral and longitudinal path tracking control of four-wheel steering vehicles. By the introduction of virtual points, a robust and adaptive path tracking control strategy is proposed to simultaneously counteract modeling uncertainties, unexpected disturbances, and coupling effects. An adaptive model-based feedforward adaptive term and the robust integral of the sign of the error (RISE) feedback term can be used to yield an asymptotic tracking result, which improve the tracking performance and reduce the control effort. The stability of closed-loop system is analyzed using a Lyapunov-based method. Simulation results are provided to demonstrate the performance of the proposed controller under different driving conditions.     

基于 ATE 的 FPGA 器件测试方案研究磁

在 FPGA 器件的测试领域,由于通用 ATE 的局限性,需要为 ATE 设计 FPGA 配置板。然而目前行业内通用的配置方案测试效率低、可移植性差,给 FPGA 器件测试程序的开发和测试都带来了很多不便。论文提出了一种新的 FP‐GA 多重自动配置技术,设计采用 FPGA 作为主控制器,大容量 FLASH 芯片用于存储目标 FPGA 的配置数据,具有大量存储、调取灵活、配置快速等优点,实现了 Xilinx 公司绝大部分不同型号的 FPGA 器件的多重、自动、快速重配置,有效地解决了原配置方案的弊端,提高了 FPGA 测试的效率。     

模糊综合评判理论在研究性学习系统中的研究及应用

介绍了工程数学中的模糊综合评判理论以及相应树型向量推理算法,并将模糊综合推理机制运用到研究性学习系统中进行研究型应用。该系统中运用模糊综合评判对学习效果进行合理评判,得出综合成绩,以其作为改进研究性学习模式的参考评证,从而使研究性学习过程良性发展。     

人才信息系统数据库设计

在人才信息系统的功能需求基础上,设计了一个信息数据库,能够实现招聘信息发布与查找、应聘信息发布与查找以及人才信息统计等功能。整个设计过程从需求分析、概念设计、逻辑设计等方面进行探讨。