基于信息科技下青少年水上运动项目体能训练理念与方法

水上运动不仅能够让人畅游水面,与大自然亲密接触,而且它有很强的观赏性和趣味性,能够吸引很多的人们参与到其中。现今,不管是基于父母的培养要求,还是出自于儿童自身的兴趣爱好,我们在各种水上运动馆可以看到越来越多青少年的身影。但是,我们必须认识到水上运动又是一项非常消耗体力的运动,尤其是那些正处于生长发育过程中的青少年运动员,我们必须明确对其进行体能训练的重要性。本文就青少年在水上运动项目进行体能训练的理念与方法等进行了详细分析。     

基于VC++平台的LR语法分析器的分析与实现

讨论了LR分析器的工作原理及过程,并采用VC 完成了LR分析器的实现,包括文法的收集、项目的生成回显、项目集族的构造以及LR(0)分析表的生成显示。     

国外工程勘察标书的编制

以某国外工程为例,叙述了标书的编制方法．在了解工程概况、勘察设计要求及场地条件的前提下, 依据ＦＩＤＩＣ条款编制勘察标书及其技术规范．因各地法律和生活习俗不同,还应对一些条款做修正或强调     

低排放燃烧室燃料空气预混均匀性研究

为了解决燃料与空气均匀预混的问题,以气态燃料-低排放塔式同轴分级燃烧室为研究对象,采用数值模拟与实验设计数理统计方法相结合,研究了主燃级叶片角、叶片数、燃料速度和单面孔数对燃料和空气预混特性的影响,筛选出对燃料空气预混均匀性影响的显著项,并拟合得出均匀性的预测公式。结果表明：单面孔数及其平方项对预混均匀性影响最大;燃料速度与叶片角、燃料速度与单面孔数的交互效应其次;叶片数、叶片角、燃料速度及其平方项和交互项对均匀性的影响最小。     

计价规范中措施项目组成分析

结合GB50500-2003的实施以及“建标[2003]206号文”的发布,通过对招投标过程中施工单位的报价内涵的分析,对工程建设过程中的措施项目内容进行了相关的阐述;结合工程结算过程中措施费用部分存在的问题,提出了结合措施项目的特点,进行分类管理的方法,并在此基础上提出了在招投标过程中措施费项目的合理报价方式。     

解读JJG543-1996和JJG543-2008规程

本文详细分析比较JJG543-1996和JJG543-2008规程中各检定项目计量性能和检定方法的区别,加深对JJG543-2008《心电图机检定规程》的理解。     

A taxonomy of effect size measures for the differential functioning of items and scales.

[Correction Notice: An erratum for this article was reported in Vol 95(5) of Journal of Applied Psychology (see record 2010-18410-004). There was an error in Formula 6 on page 731 for the pooled standard deviation of the ESSD index. The correct formula is given in the erratum. Related to this, in Table 8 on page 739, the ETSSD statistic should have been .094 for the cross cultural comparison and .001 for the Administration Format example.] Much progress has been made in the past 2 decades with respect to methods of identifying measurement invariance or a lack thereof. Until now, the focus of these efforts has been to establish criteria for statistical significance in items and scales that function differently across samples. The power associated with tests of differential functioning, as with all significance tests, is affected by sample size and other considerations. Additionally, statistical significance need not imply practical importance. There is a strong need as such for meaningful effect size indicators to describe the extent to which items and scales function differently. Recently developed effect size measures show promise for providing a metric to describe the amount of differential functioning present between groups. Expanding upon recent developments, this article presents a taxonomy of potential differential functioning effect sizes; several new indices of item and scale differential functioning effect size are proposed and illustrated with 2 data samples. Software created for computing these indices and graphing item- and scale-level differential functioning is described. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

基于期量折扣的变质产品订货策略

针对多频次、小批量的变质产品订货模式,提出期量折扣策略,并将其划分为时间全数量折扣和时间增量折扣两种。考虑零售商在订货过程中的机会损失成本,分别研究了两种折扣策略下的变质产品订货策略。结果表明,时间全数量折扣较时间增量折扣更能激励零售商增加订货,折扣时间限制越宽松越有利于零售商降低成本。     

Optimal pricing policy for a deteriorating product by dynamic tracking control

We study the optimal selling price of a deteriorating product under a deterministic situation in a finite time horizon where the time horizon is either known or unknown. Inventory holding cost is expressed as a quadratic function of the current inventory level. Given a known time horizon, we develop a model by considering the deterioration dynamics of the product, and show its equivalence to a generalised optimal control problem of a linear quadratic form, i.e. an optimal dynamic tracking problem with constraints on the control variable. An optimal pricing policy is derived based on the maximum value principle. The control policy takes a state feedback form; it exhibits a closed-loop relationship between the optimal selling price (control variable) and the optimal inventory level (state variable). Given an unknown time horizon, an optimal pricing policy is derived through a similar approach when the initial inventory level meets certain conditions. Numerical situations are conducted to illustrate the effectiveness of the derived price control policies. Some interesting managerial insights are discussed.     

（12期拿下）基于Apriori关联规则的电能表检定质量影响因素分析

电能表的质量问题直接影响了用户侧的供电可靠性与安全性,关系到国家电网系统稳定与经济运行。针对目前电能表质量存在的不足,应用Apriori关联规则数据挖掘方法,将7种检定试验结果作为质量评估指标,对这7类影响因素做了关联分析,得到了各个检定试验项目对检定质量的影响程度。同时探讨了检定项目的内部关联,找出了高频连带出现的不合格检定项目。在分析这些检定项高频出现的原因的基础上,得出了电能表质量薄弱点集中在计量模块这一结论。为提高检定通过率、提高产品质量提供了参考。