基于GPRS的电力集抄系统多层架构研究

研究的基于GPRS的电力集抄系统,是使用GPRS技术实现对用户用电情况的远程监控与管理。整个系统由主站管理软件和硬件集抄终端产品两部分组成。主站软件实现对于安装在用户现场的集抄终端的管理,编制并下发抄收或负控计划,接收终端报警数据。集抄终端安装在用户现场,根据主站下发的管理方案进行用户电表的实时抄收、监测与管理。     

硬石膏活性激发关键技术及其自流平砂浆研究现状

硬石膏资源丰富,但因其结构致密、活性低、胶凝性差,利用率不高.为加大硬石膏的利用途径,对硬石膏进行活性激发并用于制备自流平砂浆是目前研究的热点方向之一.文章阐述了天然硬石膏的活性激发机理,对天然硬石膏活性激发方法及在自流平砂浆中的应用等研究现状进行了分析,以期为硬石膏资源化利用提供参考.     

活动教学法在汽车营销专业教学中的实践

活动教学是以学生为中心、以活动为形式、创设良好的课堂气氛、教学效果显著的课堂模式。以汽车推销技术课程为例,具体阐述了活动教学法在教学过程中的实践。     

Culturing conceptions: From first principles

Over the past three decades, science educators have accumulated a vast amount of information on conceptions––variously defined as beliefs, ontologies, cognitive structures, mental models, or frameworks––that generally (at least initially) have been derived from interviews about certain topics. During the same time period, cultural studies has emerged as a field in which everyday social practices are interrogated with the objective to understand culture in all its complexity. Science educators have however yet to ask themselves what it would mean to consider the possession of conceptions as well as conceptual change from the perspective of cultural studies. The purpose of this article is thus to articulate in and through the analysis of an interview about natural phenomenon the first principles of such a cultural approach to scientific conceptions. Our bottom-up approach in fact leads us to develop the kind of analyses and theories that have become widespread in cultural studies. This promises to generate less presupposing and more parsimonious explanations of this core issue within science education than if conceptions are supposed to be structures inhabiting the human mind.

残障者身体自我的影响因素

身体自我是整体自我的核心成分,与心理健康、运动参与有着密切的关系,为了考察残障者身体自我因残障所受的影响,探讨运动参与对残障者身体自我、心理健康的作用,在归纳总结相关研究成果的基础上,分析讨论了残障类型、成残时间和性别三个重要因素以及运动参与对残障者身体自我的影响.结果发现:残障类型与身体自我不同的维度之间存在交互作用,学习障碍对身体自我没有显著的消极影响;功能性的躯体残障更能损害身体能力知觉,而外显的残障能对身体意象造成更大的影响;先天残障、年龄较小的残障者表现出更低的身体评价;残障者的身体自我可能在某些方面存在独特的性别差异;适应性体育活动的开展有助于残障者提高身体自我评价和自我观念.对已有研究使用的研究方法也进行了讨论.     

Comparison of two methods of estimation of low density lipoprotein cholesterol, the direct versus friedewald estimation

Current recommendations of the Adult Treatment Panel and Adolescents Treatment Panel of National Cholesterol Education Program make the low-density lipoprotein cholesterol (LDL-C) levels in serum the basis of classification and management of hypercholesterolemia. A number of direct homogenous assays based on surfactant/solubility principles have evolved in the recent past. This has made LDL-C estimation less cumbersome than the earlier used methods. Here we compared one of the direct homogenous assays with the widely used Friedewald’s method of estimation of LDL-C to see the differences and correlation. We used direct homogenous assay kit to estimate serum LDL-C and high-density lipoprotein cholesterol (HDL-C). Serum Triglyceride (TG) and Total Cholesterol (TC) was estimated and using Friedewald’s formula LDL-C was calculated. The LDL-C level obtained by both methods in 893 fasting serum samples were compared. The statistical methods used were paired t-test and Pearson’s correlation. There was significant difference in the mean LDL-C levels obtained by the two methods at the TG levels <200 mg/dl (p<0.02) and TC levels >150 mg% (p<0.001). The correlation coefficient (r) between Friedewald’s and direct assay estimation was 0.88. Friedewald’s method classified 23.5 % of patients as high cardiac risk whereas there were 17.58% by direct assay. Both had good correlation even though the serum triglyceride and total cholesterol levels affect the difference in LDL-C estimated by both methods. Taking into account the cost and performance, Friedewald’s method is as good or even better for classifying and managing patients.