浅谈输电线路故障特点及查找方法

改革开放以来,经济实现了飞速的发展,工农业生产水平有了很大的提高,人们的物质文化生活发生了翻天覆地的变化。在这种日新月异的形势下,电能成为人们生产和生活中的重要能源,其供应的安全性和稳定性被大家所关注。输电线路做为电力系统中的重要组成部分,完成电能的输送任务,其一旦发生故障,将直接影响其电能的输送,会给用户的生产和生活带来较大的不便,同时给电力系统带来较为严重的损失。本文针对常见线路故障的特点进行了分析,并进一步提出了输电线路出现故障巡视时的几点建议。     

查找违法取用地下水井的方法探讨

近几年某些单位和个人为了追求利润,私自打井取水,而且井打得越来越隐蔽。加强对水井的管理势在必行。为此,结合实际谈一下对几种查井方法的粗浅认识。     

酒酒球菌计数方法研究

以酒酒球菌为试验材料,分别用平板计数法、浊度计法、分光光度计法进行计数,所得的细胞数分别与对应的NTU值、OD值建立回归方程,方程分别为y=(0.0913 3.0075x)×107;y=(73.561x-4.8994)×107.结果显示,两个方程均有极显著的直线回归关系(P＜0.01),但前者的回归系数大于后者.因此,在酒酒球菌计数时最好用浊度计法代替平板计数法.     

电力电缆的故障查找

本文主要着重分析在设备、查找方法以及人员方面中找出电力电缆中常常出现的故障，然后谈谈如何对相应的问题进行防备，最后提出电力电缆故障查找存在问题的对策和如何对其进行完善。     

试论10kV辐射式线路接地故障查找方法

应用可靠性理论,通过对1OkV线路永久性接地故障查找的分析,提出了一种查找1OkV线路永久性接地故障的方法,能有效提高10kV线路故障时的供电可靠性,减少故障查找时间,提高故障查找效率。     

巧用查找替换操作

在WPS Office和Word中，进行“替换”操作时都可以使用“查找”内容。比如，现在你需要把档中所有的“刘博士”、“张博士”替换为“名的刘博士”和“名的张博士”，大家通常的做法是不是把“刘博士”和“张博士”分开替换呢?这样做似乎显得麻烦，其实它们是可以一起替换的。怎么一起替换呢?你不妨看看笔以下的方法。     

浅析10kV系统线路故障的查找方法

本文笔者从对10kv系统线路产生故障的分类和原因着手,进而对查找故障的方法进行了分析,并且对障碍的定位做了详细的阐述,目的是对10kv系统线路障碍查找提供借鉴和帮助,提高电力企业的服务水平,满足用户的需求,进而促进电力企业的健康长远发展。     

统计方法在小麦品质研究中的应用

统计方法是进行定量分析的一种重要工具。本文介绍了方差分析、相关回归分析、主成分分析与因子分析、聚类分析、判别分析等不同的统计方法，重点介绍了它们在小麦品质研究中的应用。通过分析研究存在的问题，做出今后深入研究的展望。     

电力电缆故障点分析及查找

自从电被人类发现并使用之后,给工业的发展和社会的进步带来了翻天覆地的变化,现代社会的正常运转已离不开电能的供给,城市化进程的加速促使电力电缆被运用到电力系统和生活中的各个领域,所以谨防电缆故障,保证供电的稳定性十分重要,本文通过阐述电力电缆对于社会发展的作用,对常见的电力电缆故障点进行了分析总结,并提出了一些查找办法,从而进一步提升电力系统的供电可靠性。     

Excel 函数——查找与引用

本文介绍了 Excel 2010 中的查找与引用类函数，并就此类函数中较为常用的几个函数做了相对详细的介绍，并分别给出了实例说明。     

次序统计量中一个二维向量的渐近正态性

“次序统计量”在非参数统计推断中作为自变量时，总体分布函数的渐近正态性将给非参数统计推断工作提供更为方便的条件．指出了“次序统计量”中的一个二维向量（Ｆ（ｘ（ｎｐ１ｎ）），Ｆ（ｘ（ｎｐ２ｎ）））的渐近正态性，并用初等分析的方法给出了证明．     

运用数理统计与模糊数学方法改进绿豆糕的产品品质

本文首先考虑从市售绿豆糕中优选出在现行生产状况下的最佳产品,以此产品的工艺配方作为我们研究改进的起点,再运用正交试验法进行探索性改进实验,得出更优的工艺与配方,并应用模糊数学方法综合评判绿豆糕产品的感官质量,然后运用回归分析方法对主要因素进行分析,从而控制产品的质量.     

METHODS FOR THE DETERMINATION OF VOLATILE NITROSAMINES IN MALT,WORT AND BEER

Methods for the analysis of beer, wort and malt for NDMA at the one in 10⁹ level using the thermal energy analyzer have been evaluated. The beer and wort procedure using Preptube extraction has been shown to give excellent results. For malt, the preparation of an aqueous extract, followed by analysis by the beer procedure, also gives excellent results. Vacuum distillation from mineral oil has also been examined for the analysis of malt. Providing sufficient aqueous phase is initially present, this procedure yields results similar to those from aqueous extraction. The methods will also detect NDEA, although no NDEA has been observed in any of the beer, wort or malt samples examined. NDMA has been observed to be present in bound forms in malt and Preptubes and is released by the addition of water     

COLLABORATIVE TRIAL ON THE DETERMINATION OF BETA-GLUCANASE IN MALT BY VISCOMETRIC AND DYE-LABELLED METHODS

The results of a collaborative trial to compare a dye-labelled beta-glucan method with that of a viscometric procedure, for estimating the beta-glucanase content of malt, have demonstrated that overall the precisions of both methods are similar. There has been an improvement in the precision of the viscometric method (which is not a Recommended Method) compared with values obtained in previous trials. The Institute of Brewing Analysis Committee judged that the results obtained by the dye-labelled beta-glucan method were not sufficiently precise to permit adoption as a Recommended Method. However, since this procedure has advantages of speed and ease of operation, it is suggested as an alternative method to that relying on viscometry. It is envisaged that a further collaborative trial will be carried out when sufficient experience of the new method has been obtained. The repeatability (r₉₅) and reproducibility (R₉₅) values found were 0.190 m and 0.327 m over the concentration (m,U/kg) range 92–266 U/kg for the dye-labelled method, and 0.173 m and (91.4 + 0.0717 m) over the concentration (m,IRV) range 233–701 IRV units for the viscometric method.     

MODERN MILK PRODUCTION METHODS IN THE EEC-FRANCE

The development of the French dairy industry over the last decade and plans for the future are shown in a general picture illustrating details of a specific representative farm. The importance of the distribution and composition of dairy herds is emphasized, also the growing necessity for crop rotation in areas of fodder crops. The need for improvement in herd strains and herd size increase is discussed also trends in feeding, showing the development in maize and Italian rye-grass. Tables are given showing the national herd, AI recording, and milk production in France. ( Editor's summary. )     

THE DETERMINATION OF SULPHUR DIOXIDE IN BEER—COLLABORATIVE TRIAL OF FOUR METHODS

The Institute of Brewing Analysis Committee has collaboratively tested four methods for the determination of sulphur dioxide in beer over the range 1 to 40 mg/litre. The p-rosaniline method (r₉₅ = 0.51 + 0.10 m. R₉₅ = 0.63 + 0.26 m) was found to have the best precision and is recommended as an alternative to the Monier Williams method (r₉₅ = 0.43 + 0.15 m, R₉₅ = 1.86 + 0.27 m) where high precision at low sulphur dioxide levels is required. The dithiobisnitrobenzoic acid (DTNB) method and the IOB rapid distillation method showed considerably worse precisions.     

A COMPARISON OF TWO METHODS FOR THE ESTIMATION OF β-GLUCANASE ACTIVITY IN MALT

A new method for estimating malt β-glucanase activity, based on a chemically modified, azo dye-labelled barley β-glucan substrate, has been compared with a viscometric procedure. The azo-barleyglucan method was found to be simple to perform, to give excellent precision with good reproducibility between laboratories and to have a high correlation (r=0·903***) with the slower viscometric procedure currently used by the industry.     

MODERN MILK PRODUCTION METHODS IN THE EEC - IN SCOTLAND

The future of the farming industry in Scotland as planned in the Government White Paper, and the significance of the part played by milk production is discussed. Comparisons between average herd sizes in the EEC and those of Scotland, the North of Scotland and Morayshire are given and methods of milking and feeding shown. The need for better grass, better management and building, also the importance of simple record keeping is stressed (Editor's summary).     

甘蔗中原花青素含量的分析方法

正丁醇-盐酸法、紫外分光光度法和高效液相色谱法是常见的分析原花青素含量的有效方法,通过试验研究这3种方法在分析甘蔗中原花青素含量时的可靠性和精确性,经比较最终确定采用高效液相色谱法为最佳方法,其最佳色谱务件:VP-ODS柱,检测波长254nm,流动相甲醇:0.1%醋酸=50∶50,流速1.0 mL/min,柱温35℃.     

THE ROLE OF STATISTICS IN PRODUCT QUALITY — SOME EXAMPLES1

The practice of thinking statistically has become more common in recent years. Rising costs, increased “consumerism” and advanced technology have stimulated more interest in probability-based decision making. Two examples of recent advances in statistical quality control technology are presented.