期刊文献+

二次检索

题名
关键词
文摘
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到4篇文章
< 1 >
每页显示 20 50 100
化学教学设计能力评价量表的编制与应用研究 被引量:12
1
作者 黄元东 颜燕 +1 位作者 闫春更 周青 《化学教育(中英文)》 CAS 北大核心 2019年第1期35-42,共8页
基于学科教学知识(PCK)编制化学教学设计能力评价量表,并对在职高中化学教师的教学设计能力进行评价,分析化学教师在教学设计中存在的问题,为提高在职高中化学教师教学设计能力提供有针对性的建议。研究表明:(1)高中化学教师在课程知识... 基于学科教学知识(PCK)编制化学教学设计能力评价量表,并对在职高中化学教师的教学设计能力进行评价,分析化学教师在教学设计中存在的问题,为提高在职高中化学教师教学设计能力提供有针对性的建议。研究表明:(1)高中化学教师在课程知识、学生知识及评价知识维度的项目上均处于未掌握等级;(2)高中化学教师在教学目标知识和教学策略知识维度的多个评价项目上处于基本掌握等级。 展开更多
关键词 学科教学知识 教学设计能力评价量表 教学设计 教学策略
原文传递
云环境下产品设计知识推送机制研究 被引量:5
2
作者 曹立志 马新宇 +1 位作者 刘桂镗 胡明艳 《组合机床与自动化加工技术》 北大核心 2015年第7期157-160,共4页
为了解决产品设计复杂性、设计难度和设计成本加剧的问题,云设计模式应运而生。云设计环境具有设计知识依赖性更强、设计者水平难以界定且参差不齐的特点,设计知识已经成为重要的服务资源,并逐渐成为云设计模式存在和发展的关键性因素... 为了解决产品设计复杂性、设计难度和设计成本加剧的问题,云设计模式应运而生。云设计环境具有设计知识依赖性更强、设计者水平难以界定且参差不齐的特点,设计知识已经成为重要的服务资源,并逐渐成为云设计模式存在和发展的关键性因素。为此,文章提出了面向任务需求的知识推送方法,构建了复杂产品设计人员能力评价体系,并从五个维度来对知识进行分类,有效地缩短了推送和检索的工作量。实现了云环境下知识与设计者的快速交互。最后,以汽车模具关键设计为例验证了文中方法的有效性。 展开更多
关键词 设计能力评价 知识分类 知识推送 设计
下载PDF
Safety and Applicability Evaluation of Railway Bridges in China 被引量:1
3
作者 Yuling Zhang Li Wang +1 位作者 Xianting Du Zhu Yu 《Journal of Civil Engineering and Architecture》 2010年第1期53-59,共7页
There are more than eight different design standards in use for the existing railway bridges in China, which have different applicabilities for bridges built in different periods. In this paper, the design load standa... There are more than eight different design standards in use for the existing railway bridges in China, which have different applicabilities for bridges built in different periods. In this paper, the design load standards in different periods are introduced and compared; The working status of the railway is investigated. According to the developing trend of separating passenger and freight transports, by comparing the computed results of the bridge effect and the fatigue cumulative damage, the applicabilities of bearing capacity and fatigue are analyzed for existing bridges. The results indicate that the bearing capacities of 99% existing bridges are suitable for the demand of 26.5 t (axle-weight) freight trains. However, for culverts, bridges with spans less than 20 m, longitudinal and transverse beams of through bridges, suspenders of truss bridges and other locally-stressed members should be evaluated and reinforced due to the increasing axle-weight. 展开更多
关键词 Railway bridge SAFETY FATIGUE passenger-freight separation.
下载PDF
Evaluation of power market designs on investment incentives and capacity adequacy
4
作者 Tetsuo Tezuka 《Engineering Sciences》 EI 2008年第2期61-68,77,共9页
Electricity industry restructuring should not sacrifice supply security to pursue economic efficiency. Till now there is no academic consensus on which electricity market design provides the least distorting investmen... Electricity industry restructuring should not sacrifice supply security to pursue economic efficiency. Till now there is no academic consensus on which electricity market design provides the least distorting investment incentives. Alternative approaches that have been adopted around the world for ensuring the appropriate level of investment in electric generation capacity are discussed, and much attention is devoted on the evaluation of capacity payment systems. The finding is that on one hand, capacity payment systems have good effect on reducing spot market price volatility and increasing the volume of generating capacity at the costs of relatively high total electricity prices; on the other hand, however, they are not robust against either the abuse of market power in the energy market or being manipulated. 展开更多
关键词 electricity industry restructuring capacity adequacy INVESTMENT EVALUATION ROBUSTNESS
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部