试论空分生产中大型电机降压起动

随着社会发展和工业化程度的提高,大功率电动机的应用越来越普遍,从几千千瓦到几万千瓦,功率级别越来越大,然而大功率电动机的起动问题一直困扰着工程界。探讨了大功率电机起动的方法,并为今后制氧生产所需大功率电机提供了比较可靠的起动模式。     

全低压大型制氧机“快速制氧”启动方法

简要介绍大型制氧机快速制氧需具备的条件，要解决的问题及具体的操作工艺与方法。     

变频调速应用技术（十）——第五讲 知己知彼用变频（下）

本文介绍了几种典型负载的机械特性。许分别说明了恒转矩负数和恒功率负载在应用变频器拖动系统时，所遇到的主要问题和对策。     

如何开发Windows NT下的驱动程序

讲述了Windows NT下设备驱动程序开发的一般方法及过程,着重讲述了设备驱动程序中的各个子例程,并给出了设备驱动程序的生成及调用的方法。     

Conjoint Consultation Using Self-Administered Manual and Videotape Parent-Teacher Training: Effects on Children's Behavioral Difficulties.

This research involved comparing the effectiveness of two different approaches of conjoint consultation using a manual versus a videotape series as the main components of joint training parents and teachers to treat children's behavioral difficulties. Children exhibiting externalizing or internalizing behavioral problems who attended Head Start Programs were targeted for this intervention. During the first 2 years of the project, a manual-based program was conducted. The last 3 years of the project involved delivery of the parent-teacher training program through a series of videotapes and accompanying manuals. Children were randomly assigned to either an experimental or no treatment control group. The effectiveness of the intervention within the experimental group was assessed primarily through a pretest-posttest, experimental-control, group repeated-measures design. Direct behavioral observations did not indicate clinically relevant improvements in behavior; however, parents' and teachers' goal attainment reports characterized students as meeting their overall behavior goals. Parents and teachers also reported high rates of treatment acceptability and satisfaction with the manual and videotape treatment programs... (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

基于UDS协议的PEPS系统安全认证方法

无钥匙进入启动系统（PEPS）相对于传统的钥匙开启车门和启动汽车,其通过低频和射频的通信,实现汽车与钥匙之间复杂的双向身份认证.为了保障双向身份认证,本文详细介绍了基于UDS协议的PEPS系统安全认证方法.通过UDS协议的诊断学习功能,实现了遥控钥匙与BCM、EMS以及ESCL的认证保护机制,以此保证了无钥匙进入启动系统（PEPS）工作的安全性,为其迅速发展提供了有力的技术支撑.     

低速直驱永磁同步电动机及其起动性能研究

利用低速直驱永磁同步电动机（PMSM）的一些电磁设计公式,结合低速电机的设计特点,完成了电机结构设计、参数计算以及工作特性和起动特性的分析,最终确定了方案.采用Ansoft电磁分析软件,通过场路耦合的计算方法,计算了电机瞬态性能参数,并通过不断地调整设计值,得到电磁设计方案.实验结果表明,低速直驱低速大转矩永磁同步电动机实验所得数据和应用程序设计结果基本一致,证明了程序的正确可行、简单方便.该研究对于进一步完善永磁同步电动机的设计具有重要理论意义和工程价值.     

The effect of platinum on carbon corrosion behavior in polymer electrolyte fuel cells

To assess the catalytic effect of platinum on the corrosion of the high surface area carbon support, single triangular potential sweeps with various upper and lower limits were applied to fuel cells comprising electrodes having different Pt/C compositions. Carbon loss rates in H₂/N₂ and air/air mode were determined by integration of the resulting CO₂ concentration peaks in the exhaust gas of the positive electrode. Generally, the contribution of platinum catalyzed carbon corrosion to total CO₂ evolution was found to decrease with increasing upper potential limit. Similar carbon loss rates obtained for Pt/C and pure carbon electrodes in case of lower potential limits of 1.0 V indicate that the catalytic activity of platinum is substantially lowered by the formation of a passivating oxide layer on the platinum particles. Changes in corrosion behavior in the potential range below 0.6 V, which cannot be attributed to platinum effects, are suggested to originate from modifications in carbon surface oxide composition. Due to the high oxygen equilibrium potential of approximately 1 V, carbon corrosion in air/air mode is significantly influenced by platinum oxide formation. However, the polarization of the negative electrode and the influence of platinum oxidation on the equilibrium potential results in a passivating effect that is less pronounced than expected from measurements in H₂/N₂ mode.     

一种基于RDSS服务的加速导航定位接收机冷启动的方法

基于RDSS业务服务的导航定位接收机的首次定位时间是衡量接收机性能的一个重要指标。接收机冷启动过程中，由于要采用轮询的方式从所有可见卫星中锁定信号，积累星历数据，导致首次定位时间延长。本文提出了一种基于RDSS服务的加速接收机冷启动的方法，该方法能够有效的提高接收机冷启动首次定位的时间，具有一定的推广前景。