低渗透性硬煤层注水方法探讨     

闫建浩 《中国科技纵横》2014,(11):202-203

矿井粉尘能够引起瓦斯粉尘爆炸以及矿山工作人员的尘肺、矽肺职业病,严重影响煤矿的安全生产和工人的健康。经实践证明煤层注水是降低粉尘的最根本、最有效的方法。针对我国存在的大量低渗透性硬煤层注水效果差这一事实,本文以提高低渗透性硬煤层注水效果为目的对低渗透性硬煤层注水方法进行总结。  相似文献   

基于iBeacon的智能导览系统的设计与实现     

吴栋淦 《贵阳金筑大学学报》2014,(4):9-13

运行在移动互联网设备上的传统智能导览系统体验性不佳。文中介绍了一种使用iBeacon技术的智能导览系统。该技术能让移动互联网设备靠近iBeacon设备时进行响应。iBeacon设备使用低功耗蓝牙技术与移动互联设备进行数据传输。  相似文献   

对日、韩、朝男足传抢特点及应对策略的研究     

程公  刘玮 《辽宁体育科技》2014,(6)

以第16届亚运会日本、韩国和朝鲜男子足球队所参加的决赛阶段比赛为研究对象,选取球队传球和抢断球的次数作为球队进攻和防守能力的指标,球队核心球员传球方向的次数、成功率和比例作为球队技战术特征的指标进行数据统计和分析,以期为我国男子足球队在今后比赛中能够更好地应对对手提供理论依据。  相似文献   

中外男子篮球组织后卫传球技术运用对比分析     

任静 《安徽体育科技》2014,(6):28-34

运用录像观察法、数理统计法等,对伦敦奥运会的中外男篮主力组织后卫的传球技术运用进行比较分析。结果显示:中国组织后卫在传球方式上运用的次数与国外组织后卫有明显的差距;在传球状态上,移动传球次数和跳起传球次数上均落后于国外组织后卫,两者有一定的差距;在传球路线上,直线传球次数落后于国外组织后卫,两者存在较大差距;中国组织后卫在解围性传球次数、攻击性传球次数和助攻次数上均落后于国外组织后卫,但中国组织后卫传球失误较少。  相似文献   

Made in China: the cultural logic of OEMs and the manufacture of low‐cost technology     

Hiroki Ogasawara 《Inter-Asia Cultural Studies》2013,14(1):27-41

Abstract

This paper investigates the conditions of the manufacture of low‐cost technology in China with the examples of ‘pirated’ VCD players, ‘no‐name’ DVD players, and Shenzhen’s development as a techno‐urban city. It emphasizes the significance of the cultural logic of original equipment manufacturers (OEMs) and argues that the various transformations and deflections that are derived from ubiquitous OEM experiences have gone beyond the original model of an authorized OEM, experiences that are to some extent embodied in the transgression of brand name and patent hegemonies, which are mainly controlled by high technology companies. OEMs have been associated with China’s current imperative and uninhibited development of low‐cost technology capitalism. ‘Made in China’ signifies the production of any product, legal or illegal, for transnational high technology giants or domestic technology manufacturers. Learning to ‘become an OEM’ in China has partly resulted in excessive technological mimesis that may be part of an unauthorized, underground economy that is based on low‐cost technology. Based on the Shenzhen experience, part of this study will show industrial production‐oriented OEM cultures in which illegal operations and counterfeit trade are incorporated, even in city projects that are shared by municipal governments and Chinese technological companies, and undergo spatial restructuring in the development of the economy, consumerism, and urbanism.  相似文献   

LoLo、HiLo、LoHi和HiHiLo训练过程中血象指标变化规律的比较研究   总被引：14，自引：0，他引：14  

高炳宏  步振威  王道  李之俊  陈坚 《体育科学》2005,25(10):32-36

采用实验法，将24名优秀女子赛艇运动员分为4组（每组6人），分别进行4周低住低练（LoLo）、高住低练（HiLo）、低住高练（LoHi）和高住高练低练（HiHiLo），旨在探讨不同模式低氧训练过程中运动员血象指标RBC、Hb、Hct和WBC动态变化的规律和特点。结论认为：不同模式低氧训练中RBC、Hb和Hct的变化幅度、特点与规律存在一定差异，与高原训练比较也有所不同；HiLo、LoHi和HiHiLo3种低氧训练模式均能明显提高运动员的RBC、Hb和Hct，但不同模式提高程度不同，RBC表现为HiLo〉HiHiLo〉LoHi〉LoLo，HB和Hct表现为HiHiLo〉HiLo〉LoHi〉LoLo，RBC与Hb和Hct的增加不完全同步；4周3种模式低氧训练效果至少可以保持2周，而HiHiLo组训练后保持Hb的能力要优于HiLo和LoHi组；不同低氧训练模式虽对WBC造成一定规律性的改变，但各组间无明显差异的结果表明，不同低氧训练模式对机体免疫机能虽有影响，但不明显。  相似文献   

谈排球传球的预备手型教学     

郑焕然  陈瑞书 《河北体育学院学报》2005,19(2):38-39

针对当前排球教学中忽视传球的预备手型的问题，从解剖学和力学的角度对预备手型进行了分析，指出了其在正确掌握正面上手传球技术中的重要作用，并进一步研究了在预备手型教学过程中应注意的问题。  相似文献   

慢性下腰痛患者腰部表面肌电信号的变化特征   总被引：3，自引：1，他引：2  

王健  方红光  Kankaanpaa M 《体育科学》2004,24(10):31-34

在中等强度动态等惯性力运动负荷条件下采集腰部L3-L4和L5-S1部位的sEMG信号，采用快速傅立叶变换和定量递归分析与复杂度计算等方法分析研究sEMG信号变化特征，采用主动康复治疗手段观察其对腰部肌肉功能的影响。结果表明：采样部位对各项sEMG分析指标以及被试分组对AEMG的作用无明显统计学意义，而采样时间对各项sEMG分析指标以及被试分组对其它sEMG分析指标的影响均有明显统计学意义。慢性下腰痛患者的sEMG信号具有低频、不复杂和有序的信号特征，主动康复治疗对改善腰部肌肉功能具有明显的作用。  相似文献   

现代足球比赛边路传中基本特征的分析研究   总被引：3，自引：0，他引：3  

马晓军  陶璋  薛予阳 《湖北体育科技》2001,20(3):39-41

通过对16届世界杯足球赛决赛阶段60场120队次,边路传中的传球区域、传球目标区域及两者比例关系等技术指标的统计分析,探索现代足球比赛边路进攻中,边路传中的基本特征,研究结果表明,2、3区为最佳传中区域.A、C区是较理想的传中目标区.  相似文献   

Peer-Based Supplemental Instruction in STEM: Differences in Effectiveness Across Transfer and Nontransfer Undergraduates     

Rabi A. Musah  Michael Ford 《Journal of research on educational effectiveness》2017,10(3):596-618

Although there is a large body of research on the effectiveness of supplemental instruction for college undergraduates, very little of it has focused on transfer students, who often confront additional sources of stress and historically perform more poorly than their native student counterparts. In this study, we investigated the effectiveness of a peer-based supplemental instructional program in general and organic chemistry at a large state university over a six-year period, while considering differences across transfer and nontransfer students. The results suggest that the supplemental instruction improved outcomes overall but that nontransfer students benefit to a greater degree than transfer students, in the form of higher grades and pass rates, from attending supplemental instruction. The results suggest that peer-based supplemental instruction is a useful method to improve undergraduate student performance in chemistry, but more research is needed on ways to enhance the effectiveness of interventions in improving the performance of transfer undergraduate students in STEM fields.  相似文献