地铁车站顶板上翻梁结构设计优化

为了解决地铁车站顶板上翻梁构造引起的上方基坑回填施工困难和管线覆土厚度不足等问题,对地铁车站顶板结构设计进行优化。在充分利用地铁车站结构空间效应和组合梁结构优势的基础上,结合顶板构造特点和施工工艺要求,采用H型钢混凝土组合梁代替传统钢筋混凝土梁,并进行了承载能力和正常使用极限状态验算。结构设计优化结果表明,在降低梁高的前提下,采用组合梁方案既可以提高梁-柱节点的整体性,改善顶板的抗裂性,也为改善车站基坑回填施工条件、提高施工质量创造有利条件。     

实践三二分段中高衔接,促进现代职业教育体系建设——以广东轻工职业技术学院为例

广东轻工职业技术学院在三二分段中高衔接中,首先,明确以职业资格证书为纽带,确定中职和高职教育应取得的职业资格证书等级,确定职业资格证书所对应的职业知识、技能应达到的标准和程度,构建课程体系与教材体系,确定"知识+技能"的职业资格考证等考核方式。其次,根据中高职招生专业现状及专业对口程度,探索了"专业对口"衔接和"宽口径"衔接两种衔接模式,分别构建了两种衔接模式的课程体系。最后,以高分子材料加工技术专业为例,进行了说明。     

双力矩作用下薄壁梁变形的数值分析

采用有限元实体单元,分析了薄壁截面悬臂梁在双力矩作用下的截面内变形。数值分析表明：开口截面在双力矩的作用下,截面以旋转变形为主,截面内的相对变形很小,与符拉索夫薄壁梁理论的“刚周边假定”吻合,符拉索夫的理论结果与实验结果符合很好;闭口截面在双力矩的作用下,以截面内的相对变形为主,截面的旋转较小,薄壁梁理论的“刚周边”假定与数值分析结果有出入。     

复势散射(英文)

在量子物理学中,散射问题是十分重要的,在其它领域中(如天体物理学、化学、粒子物理、激光物理等)也有着非常重要的作用。然而,在一般教科书中只讨论了粒子被实势散射的情况。该文采用分波法研究了粒子被中心复势场散射的问题,求得了总散射截面。     

Healthy Birth Practice #6: Keep Mother and Baby Together— It’s Best for Mother,Baby, and Breastfeeding

Mothers and babies have a physiologic need to be together at the moment of birth and during the hours and days that follow. Keeping mothers and babies together is a safe and healthy birth practice. Evidence supports immediate, uninterrupted skin-to-skin care after vaginal birth and during and after cesarean surgery for all stable mothers and babies, regardless of feeding preference. Unlimited opportunities for skin-to-skin care and breastfeeding promote optimal maternal and child outcomes. This article is an updated evidence-based review of the “Lamaze International Care Practices That Promote Normal Birth, Care Practice #6: No Separation of Mother and Baby, With Unlimited Opportunities for Breastfeeding,” published in The Journal of Perinatal Education, 16(3), 2007.     

伊河龙门段浮游植物群落及水质评价

分别于2013年3月、7月、10月、12月对伊河龙门段进行4次采样,调查浮游植物的群落结构,并对水质进行评价.结果表明,在伊河龙门段中共鉴定出浮游植物7门、105种(属).其中,绿藻门为52(属)种,硅藻门有23(属)种,蓝藻门21(属)种,裸藻门4(属)种,甲藻门、黄藻门和隐藻门各2(属)种.利用浮游植物群落结构和理化指标,结合生物多样性指数,判定伊河龙门段水质处于中营养型,达到地表水Ⅲ类水质标准.     

Research Quarterly for Exercise and Sport Survey

Many changes have taken place in the format and operation of the Research Quarterly for Exercise and Sport (RQES) in recent years. The purpose of this study was to survey the section editors, reviewers, authors, and subscribers of the RQES to determine their perceptions of its quality. An inventory was developed for each of the four groups. The content validity of the instrument was established in three stages, the last stage occurring during a pilot study. The return rate for the four groups ranged from 61% to 80%. In many respects, the RQES was rated positively. However, several problem areas were identified. One was the difficulty in adequately representing all areas of specialization in physical education. Another was the perception of the quality of research published in the journal. In some areas, the best research was viewed as being published in other journals. The new section editor format has been well-received, as have many other changes made over the past decade. The issue of primary concern is whether the journal can maintain academic respectability by attempting to represent all subdisciplines in the field.     

基于多核处理器的程序性能优化方法

多核处理器即在一个处理器芯片上集成多个处理器核心,可同时执行多个线程。虽然多核处理器中每个核的时钟频率没有增加,但多个核的并行处理提供了远比单核强大的计算能力,同时,也大大提高了CPU的设计复杂性,基于现代处理器的设计技术,结合程序的实现过程,探讨优化程序性能的几种方法,提升程序编写质量,提高执行效率。     

等离子体隐身翼面的电磁散射特性研究

设计了一种等离子体隐身翼面结构,采用时域有限差分方法对翼面的电磁散射特性进行了计算和分析,以翼面后向散射最小化为目标,对等离子体的碰撞频率、填充位置以及前缘玻璃钢蒙皮的相对介电常数进行了优化设计。研究表明,优化后的等离子体隐身翼面较全金禹翼面,可在全向上实现雷达散射截面的减缩,后向散射的减缩值可达22．56dB。     

铸铁材料受轴向压缩失效截面位置及原因分析

本文通过对铸铁受轴向压缩斜截面上剪应力和斜截面滑移错动引起摩擦力作用的考虑;以及铸铁拉、压时的应力圆进行了解析和几何分析,对铸铁压缩失效做了实际测量,获得了较为准确、可靠的铸铁压缩失效截面的位置和失效原因。