高压电力电缆受潮后的干燥处理

本文阐述了高压电力电缆受潮后，在没有专门设备时，利用普通交流电焊机代替专用电缆干燥设备（大电流发生器）对电力电缆进行干燥处理的方法。     

实用“零序电流互感器法查找电缆故障点”

论述工矿企业交联高压电力电缆的接地故障查找,结合笔者多年现场工作实践对交联电力电缆在接地故障查找方面存在的问题进行了反思,提出了一种简单实用可靠的"零序电流互感器查找法",对方法原理进行了论述并通过实例进行了验证。     

用现代化管理手段管理老冶金企业电力电缆设备

结合鞍钢这个老企业的实际，介绍了电力电缆运行的特点和强化电力电缆现代化管理的几项措施。实施后，电力电缆设备运行稳定，各种电缆故障率大幅度下降，保证了企业经营目标的实现。     

电力电缆温度的在线监测

介绍了电力电缆温度在线监测系统目前的现状,光纤光栅测温系统的工作原理、主要技术指标及基于光纤光栅测温传感器的电力电缆温度在线监测系统在包钢的应用情况.     

电力电缆故障性质分析

介绍了电力电缆的常见故障，并从故障检测的角度出发分析了电力电缆的故障性质。     

铝合金电缆项目成国内企业又一个新大陆

铝合金电缆项目是刚刚被国内企业注意到的项目。计师在安全性能和便捷敷设等方面的一致肯定和推荐，从而占据中国电缆市场首屈一指的重要位置。此类的合金电力电缆已经广泛运用于各个领域，得到了国际电力设以致“新型材料合金电力电缆在全国快速推广应用”的现象发生，     

交联电力电缆现场耐压试验方法探讨

针对交联电力电缆已不宜采用直流高电压进行耐压试验，本文阐述了交联电力电缆耐压试验技术的一些新手段。主要是串联谐振法、0．1HZ起低频交流耐压试验法，对从事电力电缆工作者有一定参考作用。     

高压电缆屏蔽层电流在线监控

高压电缆屏蔽层一般情况下接地处理,其作用主要是平衡三相交流电中所产生的不平衡电流,及满足电缆运行时单相接地故障短路电流要求,保护运行中的高压电缆免受变化的非平衡磁场下的电动力的作用,致使电力电缆终端长期处于由电动力所造成机械力的作用,尤其是对于电缆终端的应力区,更易造成损伤,导致电气绝缘受损,缩短电缆终端使用寿命。按照高压供配电系统的设计要求,三相四线制的系统中需要增加零序电流监控、保护,零序电流只应用于三相四线制的电路中,但在实际应用的高压供配电系统中存在很多三相电路,往往我们会忽视这一部分电路中外部原因造成的漏电电流及系统本身不平衡电流的监控,这两种电流较小时对电缆不会产生大的危害,一旦超过一定的数值,将会对整条高压电缆产生破坏性的影响,燃烧后将会引燃附近的高压电缆,对于整个供配电系统都是一个不小的危害。     

一号高炉电控系统的改进

我公司原有两座100m^3高炉，分别于2001年和2002年进行了扩容改造。其中2002年扩容改造的二号高炉投产后的运行情况与经济效益令人相当满意，而一号高炉投产后的情况却不尽人意。主要表现在：部分设备故障率高而且处理比较困难，检修维护不方便，工人掌握起来有难度；槽下与卷扬两部分设备没有联动环节，无法实现计算机控制的自动化运行。     

阴极保护法在电力电缆防腐蚀中的应用

纸绝缘电力电缆的服务寿命一般应为30～50年。具有腐蚀作用的环境。对电力电缆的金属铠装和护套可以造成腐蚀，从而导致电缆故障频发和寿命缩短。鞍山钢铁公司供电厂的03^#、14^#、49^#、新46^#、老46^#和51^#变电所，地处腐蚀严重地区，在1973年对电力电缆采取防腐措施以前，新敷设的直埋电缆寿命最短的只有7年。     

本钢转炉钢渣处理工艺方案的选择

介绍了目前本钢转炉钢渣的产生量及处理方法,同时也对国内其它钢铁企业不同的钢渣处理工艺进行了比较分析。结合本钢的生产实际对转炉钢渣推荐采用炉前粒化轮法与热闷工艺配合应用的处理方式,并阐述了两种工艺的原理和技术特点及钢渣深加工综合利用的途径。     

影响铝电解槽氧化铝浓度的主要因素及控制措施

电解槽中氧化铝浓度的准确控制直接影响着电解槽电流效率的提高和能耗的降低。本文详细阐述了影响氧化铝浓度控制的两大主要因素——工艺技术条件和人工操作质量,通过对中铝青海分公司某系列电解槽进行了实证分析,提出了相应的控制措施。     

电解系列电流的波动及自动稳流装置的应用

分析电解系列电流波动及波动对电解生产的影响,阐述自饱和式电抗器工作原理,浅析自动稳流装置应用原理．简要介绍自动稳流装置应用效果。     

电流回路接线故障时电流测量值的推演

阐述了在不同的电流回路接线故障情况下对电流测量输出值的影响。分别就同名端错误、相序错误、单相接地故障情况下对电流测量值的影响进行的对比分析。在此方面的研究所得可以提高在实际应用中线路测量电流数值出现异常时,对故障原因的精准定位与查找,并高效排除线路故障。     

Effect of in vitro incubation on spontaneous acrosome reaction in fresh and cryopreserved human spermatozoa

OBJECTIVES: Capacitation and acrosome reaction are prerequisites for fertilization. However, in vitro capacitation is not necessary for an agonist-induced acrosome reaction. We studied whether in vitro capacitation is important in spontaneous acrosome reaction and analyzed how capacitation before cryopreservation influences the acrosomal status of thawed spermatozoa. METHODS: Semen specimens from normal donors (n = 15) were processed by the swim-up technique and divided into two aliquots. One aliquot was capacitated (capacitation induced) for three hours by incubation in a modified-BWW medium with 3% HSA at 37 degrees C under 5% carbon dioxide. The other aliquot did not receive any treatment. Both aliquots were analyzed by CASA to assess the capacitation status of the spermatozoa and then cryopreserved. Spontaneous acrosome reaction was assessed by FITC-PNA lectin before and after cryopreservation. Sperm viability was measured using Hoechst-33258 stain. RESULTS: Before freezing, the frequency of spontaneous acrosome reaction was higher in the capacitation-induced sperm preparation (median, 20.5% [interquartile range, 17.2-37.8]) than in swim-up-induced specimens (median, 10.6% [range, 4.8-23.2]; P <.001). The percentage of viable cells showing acrosome reaction increased after cryopreservation in both swim-up-induced specimens (median, 241.4% [interquartile range, 37.1-678.6]; P <.001) and capacitation-induced specimens (median, 48.2% [range, 6.1-63.3]; P = 0.002). Although this increase was higher in the swim-up-induced specimens (P = 0.002), frequency of postthaw spontaneous acrosome reaction was similar in both groups (P = 0.18). CONCLUSIONS: We conclude that sperm capacitation significantly optimizes the acrosome reaction. However, a small proportion of normal spermatozoa do not require capacitation to undergo spontaneous acrosome reaction in vitro. After cryopreservation, the percentage of spermatozoa that had intact acrosomes was similar in both groups, despite the fact that one aliquot underwent prefreeze capacitation. These findings suggest that the acrosome reaction may involve complex mechanism(s) rather than a physiological change induced by capacitation.     

Kinetic analysis of respiratory tract proteins recovered during a sequential lavage protocol

Although bronchoalveolar lavage (BAL) has been used as a research tool for over a decade, the technique of lavage has varied markedly between laboratories. For example, lavage instillate volumes from 50 to 300 ml have been used, and yet the influence of the variable of total lavage volume on subsequent protein recovery is uncertain. We performed sequential BAL (50 ml/aliquot; total volume, 300 ml) of the right middle lobe of 14 normal volunteers and separately processed and analyzed recovered aliquots for the absolute and relative concentrations of several protein substances. These proteins include free secretory component and secretory IgA, which emanate from airway secretions, and IgG, which is thought to transude from more distal alveolar sites. Analysis of these data showed a marked decrease in the absolute concentration of all proteins measured in serial aliquots. Analysis of protein ratios in sequential aliquots, however, revealed no significant change from the first to the fifth recovered aliquot. Finally, we analyzed the influence of the size of the first recovered aliquot on absolute and relative concentrations of proteins. Here there seemed to be a trend indicating preferential recovery of airway proteins in smaller aliquots. This was significant for the ratio of free secretory component to albumin (p less than 0.05). We conclude that lung proteins are efficiently and homogeneously sampled with 100 ml of lavage instillate. Larger volumes will add more protein but not alter protein ratios. Lavage with smaller volumes may preferentially sample airway proteins.     

广钢电网35kV系统中性点接地方式改造

本文论述了广钢35kV系统中性点不接地方式不适用于广钢电网的原因,分析了目前电网的各种中性点接地方式,指出了适用广钢电网的中性点接地方式。     

我国铜消费需求及资源供给状况

本文介绍了我国目前的铜消费需求状况，分析了导致我国铜资源需求旺盛的国际因素，阐述了我国铜资源的供给状况，对如何规避铜资源供给风险提出了一些措施和建议。     

室内装饰设计的现状及创新的思考

文章阐述了当前国内室内装饰设计的现状并对存在的问题提出了改进创新的措施，旨在提高室内装饰设计质量。     

以循环经济的理念发展我国铁合金工业

以循环经济的观点，阐述了铁合金工业的现状及发展情况，并以硅铁为例剖析了铁合金的发展前景。同时指出循环经济是我国铁合金发展的必由之路，只有这样才能使以能源为代价的铁合金工业走向成熟与发展。