关于IPLV与冷水机组季节运行性能的讨论

通过对现行国家标准的研读,指出国家标准中IPLV计算和检测公式中2.3%,41.5%,46.1%和10.1%四个权重系数为国家标准确定值,不是工况测试结果,不能解读为变量。有关文献将IPLV作为评价冷水机组季节运行性能的重要指标,希望用IPLV评价冷水机组全年制冷运行能耗水平的观点缺乏设计标准和产品标准相关条款支持,笔者认为这种看法有待商榷。     

2014年云南采矿年评

根据2014年云南矿业期刊和云南采矿界在全国矿业期刊和会议上发表的论文,以及有关云南矿业发展的论文,对矿业可持续发展等12个方面进行评述。     

2014年云南冶金分析年评

评述了云南分析工作者2014年在国内刊物上发表的有关冶金分析的论文,内容包括综述、分离富集方法和分析检测方法。分析检测方法主要包括电化学分析法、分子光谱、原子光谱、滴定法和重量法、以及其它分析方法,引用文献58篇。     

正交试验设计在管道扩建优化设计中的应用

为了获得长输天然气管道干线扩建设计的最优方案,早日实现管网系统赢利的目标,以管道总年值费为目标函数建立了天然气管道系统参数优化设计模型,运用正交试验设计方法对模型进行求解,分别给出了水力约束条件、稳定性约束条件、管道强度约束条件和边界约束条件,并提出了采用正交试验设计法进行管道扩建优化设计的9个基本步骤。通过正交试验设计,不仅获得了各扩建管道与已建管道年值费用最低的最佳方案,还得到了管道管径、压力、压力比和管道壁厚等工艺参数的最优组合,实现了整个管网系统的全局优化设计。实例应用结果表明,该设计结果符合工程实际,该设计方法具有编程计算简单、计算次数少和不易漏掉最优方案的优点。     

分布式变频管网系统经济效益分析

通过计算年费用及投资回收期,对5种分布式变频方案进行了经济效益分析,结果表明,分布式混水变频系统方案为最优方案.     

Inter‐annual variability,risk and confidence intervals associated with propagation statistics. Part II: parameterization and applications

This set of two companion papers aims at providing a model for the inter‐annual variability of earth‐space propagation statistics and for the inherent risk and CIs. In part I, it was proposed to model the yearly variance σ² of empirical complementary CDFs so that where is the variance of estimation, the inter‐annual climatic variance and p the long‐term probability. Particularly, an analytical formulation of was derived and parameterized from synthetic rain attenuation data. Considering the statistical framework developed in part I, this part II is specifically devoted to the parameterization of the variance of estimation from experimental data of rain attenuation and rainfall rate. Then, a methodology to model and parameterize worldwide the inter‐annual climatic variance is presented. The model of yearly variance of the empirical complementary CDFs is finally compared against yearly experimental variances derived from data collected worldwide. The knowledge of this variability is very useful for system design as it allows the risk on a required availability and associated with a given propagation margin to be quantified. Copyright © 2013 John Wiley & Sons, Ltd.     

Changes in the Distribution of Annual Rainfall in the British Isles

The spatial distribution of annual rainfall in the British Isles is analysed from 1881 to 1990 with reference to changes in the frequency of airflow types. The influence of more frequent westerly airflows earlier this century is evident in higher rainfall in western areas. Changes from 1941 to 1970 show no evidence of a reversal of this change despite a reduction in the dominance of westerlies. Evidence for an abrupt return to a more vigorous westerly circulation since the mid-1970s, and associated wetness in north-west Britain, is found to have parallels with scenarios of future climates produced by recent climate models caused by a strengthening of the temperature gradients which drive the mid-latitude westerly circulation.     

山东省农村人均消费性支出的动态回归模型

利用山东省1978—2001年农村经济指标的数据资料，以人均纯收入和实际利率或名义利率为解释变量，建立山东省农村人均消费性支出的动态回归模型，模型的拟合和预测效果很好，预测值和实际值基本相符，从而动态回归模型能较好地反映山东省农村人均消费性支出、人均纯收入和利率在时间上的动态关系。     

山西省年降水量规律初探

通过分析山西空中气态水的运移过程和降水成因分类,形成了对山西省降水天气系统的认识;通过对1956~2000年降水量系列的统计、计算,对降水量的地域分布规律、降水量随高程的变化特征等空间分布规律,降水量随时间序列的变化规律,降水量的年内分配规律,进行了系统分析与对比。     

1998 reports of the regional Associations.

Presents the reports of the regional Associations for 1998. The reports included here are: Eastern Psychological Association--Report of the Sixty-Ninth Annual Meeting; Midwestern Psychological Association--Report of the Seventieth Annual Meeting; New England Psychological Association--Report of the Thirty-Eighth Annual Meeting; Rocky Mountain Psychological Association--Report of the Sixty-Eighth Annual Meeting; Southeastern Psychological Association--Report of the Forty-Fourth Annual Meeting; Western Psychological Association--Report of the Seventy-Eighth Annual Meeting; Southwestern Psychological Association--Report of the Forty-Fourth Annual Meeting; and Southern Society for Philosophy and Psychology--Report of the Ninetieth Annual Meeting. (PsycINFO Database Record (c) 2010 APA, all rights reserved)