Population parameters, sample statistics, and individual observations: A lesson in the law of small numbers.

Comments on the original article "Predoctoral internship training in Canada--I: Internship settings and supervisory issues," by J. L. Howes, T. M. Vallis, A. Wilson, M. Ross, and H. Louisy (see record 1996-06731-004). It has come to our attention that the data presented for Manitoba are misleading. It is stated (p. 175) that the average stipend in Manitoba decreased from 1992-93 to 1996-97. However, this is a statistical artifact due to the addition of a second program which paid less than the existing program. Rather than a reduction, the program participating in the 1992-93 survey actually increased its funding by $1,746 (from $28,671 to $30,417). A second program opened between '92-3 and '96-7 (with a stipend of $19,000). As well, on page 174 of our paper Manitoba's stipend is listed as $27,671 when it in fact was $28,671. We regret any confusion that reporting provincial averages may have caused. To clarify the funding issue, we reanalyzed our data on a program basis, not provincial basis (i.e., programs are the unit of measurement). We included only those 30 funded programs operating in 1992-93 in this re-analysis, the results of which are presented here. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

参数可变的无线式冲击波超压测试系统的研究

存储式测试在冲击波超压测试中应用多。在冲击波超压场测试中,超压峰值和时域脉宽随着TNT当量的大小和测点距爆心的距离的大小变化而变化,近距离和远距离之间超压峰值以及时域脉宽近几十倍之差,为提高测试系统的精度和测试系统的灵活性,提出了一种参数可变的无线式冲击波超压测试系统,此系统主要由无线Zig Bee模块对多个传感器节点进行无线参数设置(量程设置、采样频率设置、触发电平设置等),通过冲击波超压测试理论计算和靶场实验数据的分析,验证了该系统设计方案的可行性和优越性。     

煤炭城市改建立体交叉中交通的影响因素

煤炭城市一些大型的平面交叉口的交通现状已经不能满足日益增长的交通通行量,在考虑交通组织和交通优化都不能改善交通问题的情况下,就迫切需将其改建为立体交叉口来满足日益增多的交通流量。文章利用数据调查对改建立体交叉口需满足在一些既定条件进行了可行性分析,并介绍了如何对交叉口进行经济效益评价。     

面向关键链识别的矿山项目进度优化与仿真

针对矿山工程项目的工序复杂性与资源约束问题,以项目中所需的多种资源与工序逻辑关系为约束条件,以实现成本最低与工期最短为目标,引入关键链技术并建立项目进度管理模型.模型中首先设置对照组,并改变资源供应限制量,通过比较成本与工期来确定最佳的资源限制量和初始计划;其次在关键链的识别方法上采用灰色关联分析,通过综合考虑工序持续...     

Thermostat settings in English houses: No evidence of change between 1984 and 2007

Rising demand temperatures are widely blamed for UK home energy use not declining over time despite the increased efficiency of dwelling envelopes and heating technologies. The hypothesis that thermostat settings have risen over time is tested using a repeated cross-sectional social survey of owners of centrally heated English houses. No statistical evidence for changes in reported thermostat settings between 1984 and 2007 is found.     

结构软件使用中梁端弯矩调幅系数及梁弯矩放大系数的设置

现在结构设计中绝大部分设计人员均使用结构设计软件进行结构计算和绘图,在软件中有很多的参数设置,假如参数设置不当,一方面可能给结构设计带来安全隐患,另一方面也可能给建筑工程带来浪费。本文讨论了对结构设计极其重要的两个参数的设置,以期在保证结构安全的同时还不致给工程带来不必要的浪费。     

Relay coordination and protection failure effects on reliability indices in an interconnected sub-transmission system

Protection system failure is the main cause of cascading outages. It has been shown that the hidden failures lead to cascading outages. However, the effects of the coordination method as well as the hidden failure of the protection systems have not been investigated yet. In this paper, an algorithm based on sequential Monte Carlo simulation is proposed to find the reliability indices for different overcurrent relay coordination methods. The proposed algorithm is applied to the results of different relay coordination methods of a real network. The indices SAIFI, CAIDI, CAIFI and ENS for the results of different relay coordination methods are obtained strictly based on the contribution of the protection failure issues. Then, a comparison is made between the results of the different relay coordination methods in order to show how the coordination methods affect the reliability indices.     

贵州省乌图河一级水电站接地设计方案

针对乌图河一级水电站的接地网设计存在土壤电阻率高,可用场地小,地势险峻、地形复杂等困难因素的现状,结合其他山区水电站的接地网设计、运行经验,对乌图河一级水电站接地工程进行了设计分析,提出沿河道设置地网和在适当地区设置外延接地降阻并配合降阻剂降阻的方案。     

High-tech with the human touch: Using telehealth to reach America's children.

[Correction Notice: An erratum for this article was reported in Vol 31(2) of Professional Psychology: Research and Practice (see record 2007-17403-001). On page 4, the last sentence of text incorrectly reads, "For additional telehealth project, policy, legal, and funding information, visit OAT's web site at http://www.telehealth.hrsa.gov." The correct web site address is http://telehealth.hrsa.gov.] In the past decade, we have seen new telecommunication and information technologies used to provide health services, health professional and consumer education, and public health and administrative services. The application of these tools to health care, commonly referred to as telehealth, provides an unprecedented opportunity, as we embark on a new millennium, to take services to those in need-to "carry the water to the desert." Telehealth provides both a means to increase access, and to reengineer the processes of care, enhancing the equality and effectiveness of health services. This article illustrates how telehealth has helped children and youth in various health care settings. Many of these projects have been initiated with federal funds from OAT or other federal agencies. Some of the projects use technologies that require special phone lines and expensive equipment ranging from $15,000 to $50,000; others run over regular phone lines and use equipment costing between $500 to $1,000. Psychologists are involved in many of these projects as initiators of services, as members of multidisciplinary teams, and as researchers. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

CNC-4A数控气割机系统故障分析与排除

对CNC - 4A数控气割机加工过程中 ,在X轴逆向接近换向时出现失步这一软故障过程的分析 ,是数控机床故障分析与排除非常有效的方法