大学生体质健康测试中运动损伤的调查研究

为了更好地完成《国家学生体质健康标准》的测试工作,本文采用文献资料、逻辑分析、实地考察等方法,对大学生体质健康测试过程中常发生的运动损伤进行了分析,并提出相应的预防措施,为体质健康测试的顺利进行、学生的健康发展、教育主管部门的决策提供了理论依据。     

Molecular design revitalizes the low-cost PTV-polymer for highly efficient organic solar cells

Developing photovoltaic materials with simple chemical structures and easy synthesis still remains a major challenge in the industrialization process of organic solar cells (OSCs). Herein, an ester substituted poly(thiophene vinylene) derivative, PTVT-T, was designed and synthesized in very few steps by adopting commercially available raw materials. The ester groups on the thiophene units enable PTVT-T to have a planar and stable conformation. Moreover, PTVT-T presents a wide absorption band and strong aggregation effect in solution, which are the key characteristics needed to realize high performance in non-fullerene-acceptor (NFA)-based OSCs. We then prepared OSCs by blending PTVT-T with three representative fullerene- and NF-based acceptors, PC₇₁BM, IT-4F and BTP-eC9. It was found that PTVT-T can work well with all the acceptors, showing great potential to match new emerging NFAs. Particularly, a remarkable power conversion efficiency of 16.20% is achieved in a PTVT-T:BTP-eC9-based device, which is the highest value among the counterparts based on PTV derivatives. This work demonstrates that PTVT-T shows great potential for the future commercialization of OSCs.     

Injectable hybrid inorganic nanoscaffold as rapid stem cell assembly template for cartilage repair

Cartilage injuries are often devastating and most cannot be cured because of the intrinsically low regenerative capacity of cartilage tissues. Although stem-cell therapy has shown enormous potential for cartilage repair, the therapeutic outcome has been restricted by low survival rates and poor chondrocyte differentiation in vivo. Here, we report an injectable hybrid inorganic (IHI) nanoscaffold that facilitates fast assembly, enhances survival and regulates chondrogenic differentiation of stem cells. IHI nanoscaffolds that strongly bind to extracellular matrix (ECM) proteins assemble stem cells through synergistic 3D cell–cell and cell–matrix interactions, creating a favorable physical microenvironment for stem-cell survival and differentiation in vitro and in vivo. Additionally, chondrogenic factors can be loaded into nanoscaffolds with a high capacity, which allows deep, homogenous drug delivery into assembled 3D stem-cell-derived tissues for effective control over the soluble microenvironment of stem cells. The developed IHI nanoscaffolds that assemble with stem cells are injectable. They also scavenge reactive oxygen species and timely biodegrade for proper integration into injured cartilage tissues. Implantation of stem-cell-assembled IHI nanoscaffolds into injured cartilage results in accelerated tissue regeneration and functional recovery. By establishing our IHI nanoscaffold-templated 3D stem-cell assembly method, we provide a promising approach to better overcoming the inhibitory microenvironment associated with cartilage injuries and to advance current stem-cell-based tissue engineering.     

多种结构形式的统一—如东县中学“科技楼”的主体结构设计试析

通过如东县中学“科技楼”的主体结构设计,探讨当代现代重点中学办学环节中硬件设施应具备的结构设计理念和设计方法,力图达到多种结构形式及技术与经济的完美统一。     

教育与代际收入流动关系(下)——基于研究方法与经验发现的文献述评

中西方有关代际收入流动的研究成果十分丰富.就教育与代际收入关系的实证研究而言,现有研究在方法上大体可以分为三类:第一类研究使用断代分析法或倍差分析法对国家教育制度或政策效果进行评价;第二类研究使用中间变量法或代际系数分解法,探究不同的教育获得变量对代际收入流动性的影响;第三类研究基于经济学基本理论建立数据模型,并使用经验数据对模型拟合,对教育与代际收入关系进行了丰富且有趣的探讨.各国实证研究均显示教育确实对代际收入流动性具有一定的解释力度.西方国家研究显示:第一,教育对代际流动的净效应在30％-40％左右,而我国少数几项研究显示教育的解释力度在10％左右;第二,教育对收入流动性的解释力度存在时间、地区、性别、收入、职业等多方面的差异;第三,不同阶段的教育促进代际收入流动的作用不同,早期教育的作用大于高等教育;第四,延长教育年限和延迟分流对代际收入流动具有正向促进作用,而教育扩张和教育机会增加则不必然带来代际收入流动的提升.未来研究可将重点放在基于中国现实背景的研究以及国际比较研究,而计量模型的完善及对教育获得变量的详尽考察对于提高研究质量至关重要.     

模具设计与制造专业建设与改革的思考

模具是制造业的基础工艺装备,是衡量一个国家制造水平的重要标志,在整个国民经济中占有重要的地位,然而我国模具人才短缺严重。结合自身工作,对职业院校模具人才培养情况进行阐述,并提出专业建设与改革的思路和措施。     

试论搏击技术中的防守反击

探讨防守反击技术的形成、战术意识的培养 ,有助于在搏击实战中有效运用防守反击技术。实战中防守反击技、战术的有效运用要靠平时训练来培养。平时训练要采用多种手段进行防守反击技术训练,并一定要把战术意识的培养贯穿始终。     

跆拳道运动对大学生的影响

跆拳道运动进入高校体育课堂,是对体育课程教学内容有益的补充。文章考察了习练跆拳道对普通大学生在心理、体质等方面的影响,研究结果显示:跆拳道运动对大学生的影响是积极的。     

谈高等职业教育面临的挑战及对策

当前,高校扩招既给高等职业教育的发展带来了机遇,也给它带来了前所未有的影响和冲击。面对机遇和挑战,针对当前高等职业院校办学中暴露出来的问题,文章进行了理性的分析和探讨,试图找出对策,为高等职业教育的生存、发展和壮大提供依据。