预防维护下装配线平衡的集成优化

在装配线生产过程中,当某个工位的设备突发故障时会导致全线停工,带来重大的经济损失,为此本文提出预防维护下的装配线平衡问题,对正常生产和设备维护两种情形下的生产负载进行集成优化。以给定工位数量下正常生产节拍、预防维护时的生产节拍以及两种模式切换时的工序调整数量的最小化为目标建立数学模型,采用遗传算法进行求解。案例分析表明,预防维护下的装配线平衡可有效实现正常生产与设备维护之间的快速切换,保证生产的高效性和稳定性。     

Enhanced low-humidity performance of proton-exchange membrane fuel cell by introducing hydrophilic CNTs in membrane electrode assembly

Hydrophilic carbon nanotubes (HCNTs) were introduced into the membrane electrode assembly (MEA) to improve its low-humidity performance. The effects of types, placement, loading, and relative humidity on the MEA performance were investigated. It has been found that the MEA with 20 ?wt% HCNTs loading both in anode and cathode achieved the best self-humidifying performance. Its current density reached 1550 ?mA ?cm^?2 at 0.6 ?V, with a maximum power density of 953 ?mW/cm² at 70 ?°C, 30 psi and 30% relative humidity conditions. Besides, the stability test shows that its current density at 0.6 ?V only decreased by 6.4% after 44 ?h performance test, while the performance of blank MEA without HCNTs decreased by 45% within 6 ?h testing period. This extraordinary performance under low humidity condition is ascribed to that the HCNTs contained in the MEA improve the water management and mass transportation by functioning as a dispersant and hydrophilic agent.     

寻找WPS加密文件密码的实用程序

根据WPS文件的结构特点,本文利用DOS中的文件句柄功能编制一汇编语言源程序,可以方便地找出加密文书文件的密码。     

烟机卷接机组中AMK交流伺服系统的硬件组成及性能分析

AMK交流伺服系统在卷接机组中的应用主要是代替传统的由主电机、齿轮和皮带的传动方式,实现多电机同步驱动。本文重点介绍AMK交流伺服系统在卷接机组中的硬件组成,并对其性能加以分析。     

汇编语言中求解任意十进制整数除法的一个算法

研究了任意两个十进制整数除法的汇编语言实现问题，给出了算法思想、程序流程及部分程序源代码．通过对相关数据进行测试，验证了算法的正确性和有效性．     

工业雷管计算机控制自动化编码生产线

介绍了工业雷管计算机控制自动化激光编码生产线的工作过程、主要技术指标、安全防护措施和实际应用的效果。     

在机器人轴孔装配中应用力传感器搜索找孔研究

本文介绍一种在机器人轴孔装配中应用六维腕力传感器进行搜索找孔的方法，以及在Ａｄｅｐｔ Ｏｎｅ装配机器人上进行实验研究的工作。     

轿车生产线装配工艺规划的仿真系统设计

轿车生产线工艺规划是连接轿车设计与大批量生产的桥梁，为提高计算机辅助生产线装配工艺规划的质量和效率，本文在完成轿车装配工艺建模和装配序列生成的基础上，综合考虑流水线装配生产中与装配工艺规划密切相关的因素，提出建立装配流水线工艺图的仿真建模方法，设计了相应的软件包进行面向生产线的装配任务规划，直观显示任务规划结果，为工艺规划提供了有效的工具。     

Developing pharmacological therapies for Alzheimer disease

Alzheimer disease (AD), while chronic and progressive with an average progression of 7 – 10 years, is both multifactorial and heterogeneous. Thus, AD offers a large window of opportunity and a large number of therapeutic targets to inhibit it. The selection of a therapeutic target, however, is one of the biggest challenges in developing a pharmacological treatment of this multifactorial disease. Inhibition of a pivotal downstream event is likely to benefit more patients than inhibition of an upstream event in AD pathogenesis. Neurofibrillary degeneration of abnormally hyperphosphorylated tau offers such a pivotal therapeutic target. Abnormal hyperphosphorylation of tau and not its aggregation into filaments appears to be the most deleterious step in neurofibrillary degeneration. Tau can be abnormally hyperphosphorylated by downregulation of protein phosphatase-2A activity or by upregulation of more than one tau kinase. Restoration of the phosphatase activity which is downregulated in AD brain or inhibition of GSK-3β and cdk5, which are required for AD-type abnormal hyperphosphorylation of tau, are among the most promising therapeutic strategies.