厌氧发酵工艺动力学分析与优化计算

本文通过对酶促反应动力学和微生物生长规律的分析,从理论上建立了产气的数学模型,并以此为目标函数在微型机上进行了非线性优化计算,为电子计算机进行沼气发酵工艺的定量分析和自动控制进行了有意义的探索和尝试。     

光电互感器(二)——21世纪电力系统电压电流测量的基本设备

本文系统的介绍了各种光电互感器的基本原理和结构,以及国内外光电互感器的研发和应用情况.     

IGBT高压大功率驱动和保护电路的应用研究

通过对功率器件IGBT的工作特性分析、驱动要求和保护方法等讨论，介绍了的一种可驱动高压大功率IGBT的集成驱动模块HCPL-316J的应用。     

新型鉴相鉴幅漏电继电器的研究

本文阐述了剩余电流保护器的工作原理,对鉴相鉴幅的智能化进行了理论分析,给出突变漏电电流检测方法,可以实现突变电流动作无死区,利用单片机技术可以实现漏电动作保护的延时,保持特性改变方便。     

Diagnosis of Gearbox Typical Fault in Rolling Mills Based on the Wavelet Packets Technology

The early impulse fault diagnosis of the gearbox in rolling mills is often difficult and labour intensive because the gearbox of that high speed machine is multi-shafting transmission system,in which many gearsets and rolling bears work together at the same time and there are much complex frequency structure and various disturb.A new time-frequency method based on the wavelet packets technique was developed and used to extract the impact feature from signals collected from faulty data of one rolling mills gearbox.The method improves the signal to noise ration so that results obtained using this method represents features with fine resolution in both low-frequency and the high frequency bands.The results of analysis indicate the validity and the practicability of the method proposed here.     

金圣节能清净剂 节能减排领导者

<正>随着我国私人轿车保有量日益增加,油价不断上涨,这都使节能减排任务更加艰巨。作为一个发展大国,我国还担负着低碳环保的世界责任。为应对全球气候变化,我国政府承诺到2020年单位国内生产总值二氧化碳排放要比2005年下降40%~45%,节能提高能效的贡献率要达到85%以上。这都给节能减排工作带来巨大挑战。目前,我国私家汽车保有量达9000多万辆,平均消耗汽油2.15吨。环保节能专家指出:如果每辆车都使用金圣车用燃油高效节能清净剂则每年节油达4000万吨,相当于大庆油田全年     

基于XML技术的政府网站信息共享平台研究

本文通过对政府网络信息共享中存在的诸多问题,提出一种XML技术在政府网站信息共享平台的整体架构,经过试验后,完全解决了信息共享中存在的各类问题,效果良好。     

A TEM study of morphological and structural degradation phenomena in LiFePO4‐CB cathodes

LiFePO₄‐based cathodes suffer from various degradation mechanisms, which influences the battery performance. In this paper, morphological and structural degradation phenomena in laboratory cathodes made of LiFePO₄ mixed with carbon black (CB) in a 1 mol/L LiPF₆ in EC : DMC (1:1 by weight) electrolyte are investigated by transmission electron microscopy at various preparation, assembling, storage, and cycling stages. High‐resolution transmission electron microscopy imaging shows that continuous SEI layers are formed on the LiFePO₄ particles and that both storage and cycling affect the formation. Additionally, loss of CB crystallinity, CB aggregation, and agglomeration is observed. Charge–discharge curves and impedance spectra measured during cycling confirm that these degradation mechanisms reduce the cathode conductivity and capacity. Copyright © 2016 John Wiley & Sons, Ltd.