太阳能空间斯特林热机性能的优化分析

建立太阳能驱动的空间斯特林热机的循环模型，应用有限时间热力学理论和太阳能集热器的辐射损失模型，研究受热阻和回热损失影响的太阳能斯特林热机循环性能，导出空间热机效率的基本优化关系，确定太阳能集热器的最佳工作温度和效率界限，讨论各种不可逆性对空间热机性能的影响，所得结论可为太阳能空间斯特林热机的优化设计提供新的理论指导。     

跨国公司技术转移研究评述

跨国公司是影响世界经济发展和技术进步的重要力量。本文通过对1960年代以来国内外学术界有关跨国公司技术转移影响东道国或地区经济增长和技术进步的理论和实证研究成果进行细致的分析和梳理发现:整体上看,跨国公司的直接投资对东道国或地区经济增长和技术进步的影响是不确定的。在很多情况下,跨国公司的技术控制会造成东道国或地区企业长期的技术依赖。更重要的是,学术界一直缺乏基于提高东道国或地区技术创新能力视角的研究,更缺乏精确度量技术转移程度的指标体系,而这正是我们全面、客观、科学评价跨国公司技术转移和技术扩散的出发点。     

Bilateral practice improves dominant leg performance in long jump

Benefits of bilateral practice both for the non-dominant and for the dominant body side have been shown in several studies. Thereby, most of the studies included movement tasks of the upper extremity or investigated sports games in which the ability of acting bilaterally is an essential basis for success and, thus, a bilateral practice is reasonable anyway. Individual unilaterally performed sports including movement tasks of the lower extremity are rarely investigated. Therefore, the aim of our study was to test if contralateral transfer due to bilateral practice can be found in an unilaterally performed sport including the lower extremity. We trained and tested 61 adolescent athletes in long jump to compare the jumping performance of the dominant leg after a 12-week practice period between two groups: a bilateral practice group that practiced specific long jump exercises with both the dominant and non-dominant leg and an unilateral practice group that practiced specific long jump exercises only with the dominant leg. Results showed a superior effect of bilateral practice compared to unilateral practice regarding the jumping performance of the dominant leg. The performance increase at post-test and retention-test for the dominant limb was significantly higher for the bilateral practice group (pre-to-post: 5.2%, pre-to-retention: 7.4%) compared to the unilateral practice group (pre-to-post: 3.4%, pre-to-retention: 4.5%). Thus, bilateral practice should be established in the early practice programmes of track and field athletes to improve the performance of the dominant take-off leg.     

基于语料库的学习者名词与名词搭配失误分析

本文基于赋错误码的CLEC,探讨了中国英语学习者名词与名词搭配失误的类型,并从迁移的角度对不同类型的失误进行解释.采用的检索软件是Wo州smith.本文将失误分为名词 名词,名词 介词 名词,名词所有格 名词等五类.数据表明,学习者失误主要来源于母语负迁移的影响.而随着英语水平的提高学习者母语迁移的影响变化不显著.     

母语思维在英语写作语篇中的负迁移作用

本文从中西思维模式差异入手,结合教学中收集的学生作文中典型语篇特点来分析学生在英语写作中母语思维模式的负迁移现象,从而引起教师及英语学习者对写作中思维模式转换的重视,并促进英语写作教学的调整。     

楚雄市城市发展对气候的影响分析

利用云南楚雄市气象观测站资料与其郊区南华气象观测站资料进行对比分析，发现了楚雄市的城市气候的一些年变化和日变化规律。结果表明，进入二十世纪80年代以来，随着城市的发展，楚雄市城市气候变化日趋突出，并且有明显的季节性。     

两道循环效率题的启示

由两道循环效率题的解答，总结计算循环效率时应注意的两个问题。     

University,Knowledge and Regional Development: Factors Affecting Knowledge Transfer in a Developing Region

The role of knowledge in the current knowledge economy cannot be overly emphasised. Successful regions are continuously being linked to excellence in the production, accumulation, and application of knowledge. Universities have increasingly been at the centre of such knowledge production, application and transfer. Yet, there is little research and evidence in this regard pertaining to less developed countries. The paper aims to fill this gap. The study uses the conceptual notion of knowledge transfer to interrogate the engagement level between the university and its region. Using a qualitative approach comprising the use of primary and secondary data, the authors capture some of the factors affecting knowledge transfer. Highlighting both supply-side and demand-side factors, the authors argue in favour of a nuanced and complex negotiation of the knowledge-development interface between universities as knowledge producers and regional stakeholders as knowledge users. Such negotiations should take cognisance of local realities.     

外墙保温对夏热冬冷地区住宅空调负荷的影响

采用DeST软件,对夏热冬冷地区外墙保温的住宅进行了全年的能耗模拟,分析了不同外墙保温形式对住宅负荷的影响·     

掺杂剂与基质材料能量匹配的红色有机发光二极管

1　Introduction　Organiclight emittingdiodes(OLEDs)haveattract edconsiderableattentionduetoitsgreatpotentialinefficiency ,low voltage ,large area ,lightweight ,andfull colorflat paneldisplays[1,2 ] .Forfull colordis plays ,itisnecessarytohaveefficientred ,green ,andblueemitterswithappropriatechromaticity .Bycom parisonwiththehighperformanceofblueandgreenOLEDs ,theperformanceandpurechromaticityofredOLEDsarestillrelativelypoor .UsuallyredOLEDsareimprovedbydopingreddyesintohostmaterialswit…