oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
截齿截割煤体变形破坏过程的红外热像研究  [PDF]
王春华,丁仁政,李贵轩,郑连宏
岩土力学 , 2007,
Abstract: 对截齿截割煤体变形破坏过程的红外热像进行测量和分析,从而研究截齿截割作用下煤体变形破坏规律。改变截齿类型、截割速度、截深、测量方位等测量煤体红外热像,发现扁齿截割时在垂直截割方向与扁齿凸脊相应处出现条状高温区;锥齿截割时在齿尖附近出现点状高温区;截割速度越快,热效应越明显。截齿截割煤体过程中,温度场中最高温度值与截深及煤体力学性质有关。截深越深,温度场中最高温度越高;煤体的抗拉强度、抗压强度、黏结力、内摩擦角越大,高温区的最高温度越高。
Outdoor schools: Limits and dilemmas  [PDF]
Irena Smetá?ková
Pedagogicka Orientace , 2011,
Abstract: Outdoor school is a stable element of Czech educational system. However,many changes have occurred during the last twenty years in the purposes of outdoorschools and in their organization. The article presents various school statistics andresults of research which included questionnaire survey in elementary schools in Pragueand a case study of two classes. The study found that the outdoor school programmesare getting shorter, budgets for outdoor schools are reduced, and prices of outdoorschool programmes for parents are increasing. Because of high prices, almost 20 % ofpupils cannot attend outdoor schools. Nevertheless, according to teachers, pupils andparents, the main purpose of outdoor school programmes is to create a better socialclimate in peer groups. Because of high rates of absence, this goal is partly invalid.Another purpose should be that teachers and children get to know each other better.This goal is invalid as well because many schools hire commercial agencies which limitsthe time that pupils and teachers spend together.
中国家庭户分析  [PDF]
郭志刚,武超
人口研究 , 1990,
Abstract: ?<正>家庭是社会的基本单位,人口中的绝大多数都生活在家庭户中。现代研究发现,在分析社会行为和经济行为时,有很大一部分与其说是由个人的特征决定的,还不如说是由个人所在的家庭的特征决定的。比如,个人的社会观点、消费或储蓄倾向等等无不受到自己家庭情况的影响。因此,我国家庭户的现状和发展趋势,应该作为基本国情内容的一部分来研究,
Outdoor play and learning: Policy and practice  [cached]
Kathleen Burriss,Larry Burriss
International Journal of Education Policy and Leadership , 2011,
Abstract: This study describes national school district policy and practice regarding elementary school children's outdoor learning and play. District representatives from 173 randomly selected school districts completed questionnaires describing policy and practice related to recess, outdoor play, outdoor curricular studies, playground materials, ADA accessibility, and administrative support. Quantitative analyses indicate that although the largest proportion of school districts overall reported maintaining the same amount of outdoor activity time, more school districts reported decreasing time spent outdoors than school districts that reported increasing children's time outside. There were no significant differences in variables across the three different-sized school districts. These data are congruent with other findings indicating that decreasing children's outdoor time is a national trend. Data suggest administrators’ greater support for outdoor play and learning than previously identified. These findings are discussed as an opening dialogue between administration and teachers to plan for children’s quality outdoor experiences.
户用仪表的物联网构建  [PDF]
刘慕双?,山红伟?
河北科技大学学报 , 2011, DOI: 10.7535/hbkd.2011yx01009
Abstract: 介绍了物联网远程抄控户用仪表的数据传输和控制方法,采用m-bus总线作为户用仪表的现场总线网络,msp430嵌入式系统单片机作为户用仪表现场网络的小区主站,gprs无线数据传输方式作为小区主站与城市户用仪表管理中心之间相互通信的手段,构建了具有internet共享浏览数据、远程控制及故障诊断功能的户用仪表物联网。
Market segmentation of goods for sports and outdoor activities
Elena Bratyhina,Irina Toimenceva
Koncept : Scientific and Methodological e-magazine , 2013,
Abstract: Article is devoted to questions to market segmentation of goods for sports and outdoor activities. Authors allocate the main segments of consumers of goods for sports and outdoor activities, carry out market segmentation on types of goods and services, and as segmentation on the competing organizations.
基于单齿截割试验条件的截割阻力数学模型  [PDF]
刘春生,李德根
煤炭学报 , 2011,
Abstract: 根据单齿截割阻力谱隐含着煤岩破碎性信息以及截齿与煤岩作用的机理,辨识出采煤机滚筒破碎煤岩的截割阻力,提出了基于单截齿截割阻力试验谱、截齿截割规律及工作参数来确定滚筒瞬时截割阻力的新方法,建立滚筒截割阻力试验-理论综合模型,给出了截割阻力模型的3种算法。模拟结果表明:截割阻力的特征和量值均有很好的复合度,反映出了煤岩破碎内在的规律。
用水户协会法律制度比较研究  [PDF]
孙婷
人民黄河 , 2007,
Abstract: ?通过分析马达加斯加用水户协会的落败成因,认为需要认真对待制度实践与法律文本之间的差异,简单的规则移植会导致制度的失败.从学理层面提出了用水户协会制度建设应该包含的基本内容:水权界定、用水户的权利、用水户的义务、用水户的责任、用水户协会的组织机构及治理结构、用水户协会的定位等.
煤层气勘探开发中的割理研究  [PDF]
樊明珠,王树华
煤田地质与勘探 , 1997,
Abstract: 介绍了割理的识别准则、组合类型、面割理和端割理的严格定义、割理的研究内容、割理形成的地质控制因素和割理对煤层渗透性的控制作用。
明代黄册归户底籍二种  [PDF]
栾成显
安徽大学学报(哲学社会科学版) , 2007,
Abstract: 上海图书馆藏《嘉靖徽州府歙县程玄信黄册析户册底》系黄册分析归户册,为正式告明立户之际,在新老各户之间对黄册所载人丁事产进行分析归户;《万历徽州府祁门县吴自祥户黄册归户册底》系黄册田亩税粮归户册,是将黄册所载税粮,在本户所属各子户下进行归户。文书所载表明,明清时代即使占有土地不多的一般业户,从户内的经济关系而言,亦多为总户与子户这种关系,具有普遍性。
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.