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排序方式: 共有573条查询结果,搜索用时 15 毫秒
101.
国内外二恶英研究进展   总被引:4,自引:0,他引:4  
二恶英具有挥发性和脂溶性,在自然界和生物体内广泛存在,它的毒性相当于氰化钾的1000倍以上,被人们称为“地球上毒性最强的毒物”,因而,二恶英对人类健康的潜在威胁引起了人们的极大关注,近年来国内外对二恶英的研究不断增加,主要集中在二恶英的性质、来源、分布、防治措施等方面.  相似文献   
102.
学生在机械设计竞赛、课程设计和毕业设计环节中出现了对机械产品开发设计过程不清楚,缺乏对机械系统进行建模、分析和优化设计的能力等问题,基于学习产出的教育模式(Outcomes- Based Education,缩写为OBE模式)对“机械原理”教学各环节进行改革。笔者提出了如下措施:从设计方法学的角度组织课程教学内容,教授过程中强调设计环节各知识点的关联性,培养学生掌握和规划机械产品开发设计过程的能力。以“机械原理”中典型机构为主,从机构运动模型构建、运动分析和优化设计三个层次设置不同项目,培养学生机构运动方案分析的能力,并在教学过程中进行了教学实践探索和持续改进。  相似文献   
103.
水稻细菌性条斑病菌的相关研究   总被引:1,自引:0,他引:1  
温志杰 《大众科技》2013,(7):130-131,134
水稻细菌性条斑病菌(Xanthomonas oryzae pathovar oryzicola,简称Xoc),它是使水稻致病的主要病原菌之一,其引发的水稻细菌性条斑病目前还没有有效的方法控制。文章主要介绍了水稻细菌性条斑病的病原菌、致病机理、研究方法以及防治措施。  相似文献   
104.
大学生是最活跃的社会创业群体,但由于自身经验不足,大学生创业常要经受挫折的心灵熬煎,这严重阻碍了大学生继续创业的激情。因此,加强弱势大学生创业活动中挫折心理教育极为必要。弱势大学生创业挫折心理教育包括创业前、创业中和创业后的挫折心理教育。做好弱势大学生创业挫折心理教育,需要教育者、大学生、亲戚朋友和社会人士的共同努力。  相似文献   
105.
WTO机制的法律经济学分析及其对我国的意义   总被引:1,自引:0,他引:1  
WTO的主要机制体现了经济学的内涵,并具有经济学含义的重要价值观。将法律经济学这一学科理论和工具用于更透彻地分析WTO的法律问题,对促进国际社会的效率、公平和秩序起到促进作用,同时对中国加入WTO采取正确的对策也是有益的。  相似文献   
106.
创新是经济增长的核心动力。当前国际社会主要经济体都把创新经济作为助推经济发展的主要力量,尤其是新兴市场经济体,更是把创新确立为国家战略以端显其重要性。其中影响创新内生增长的核心因素就是创新体系的机制设计。如何构建有效而激励相容的创新机制设计框架,是提高我国创新能力,推动国家步入智本经济的必要前提和根本保障。从激励相容的创新机制设计出发,结合美国成功经验和新经济增长理论,对构建并完善我国创新经济的机制设计和框架进行一些思考。  相似文献   
107.
Resilience is understood to be the ability to adapt positively in the face of adversity. In relation to new students on a distance learning module, this can mean how they adapt and make sense of the demands of their chosen study to enable them to persist in their studies. This article reports a small-scale study involving semi-structured telephone interviews with students on a level 1 distance learning module at the UK Open University. Students identified the challenges they experienced such as carving out time to study alongside other commitments, as well as developing their academic writing. Students also identified factors that enabled them to adapt to these challenges and be successful in continuing to study. Students rated highly the support they received from tutors in the form of tailored, detailed feedback on their assignments. Other factors that enabled students to persist in their studies were time management, self-belief and motivation.  相似文献   
108.
Critical educational literature suggests that an increased reliance upon performative technologies is currently transforming the very foundations from which teacher subjectivities are constructed. Arguably though, the number of studies pointing to this risk or tendency is considerably larger than the ones theorising why this should be the case. Further, in those cases where the relationship between performative technologies and teacher subjectivities is theorised, the psychological mechanisms that the technologies appeal to are seldom brought to the fore. Based on this, the purpose of this article is to theorise the psychological mechanisms that performative technologies appeal to and work through, by means of identifying, systematising and elaborating extant understandings of such mechanisms in the critical educational literature. The results are presented in the form of a conceptual framework (referred to as the CMIS-framework) which suggests that one and the same performative technology may play many different roles, where each such role appeals to and works through a particular psychological mechanism. Importantly, depending on the type of psychological mechanism that is appealed to, the CMIS-framework suggests that this will lead to teachers (un)consciously conducting particular forms of subjectivising work upon themselves, here referred to as compliance, mirroring, identification and self-realisation (CMIS).  相似文献   
109.
徐飞  韩丽峰 《科学学研究》2007,25(5):842-847
 摘要:科研新手一般是通过其研究成果在学术界获得承认,进而逐步在科学共同体中获得认可并确立地位的。在科研新手学术成果获得承认的过程中,一般会受到新手身份、成果特点以及科学共同体自身性质等因素的影响。对科研新手学术认可的拒绝或延迟,直接影响到科学家梯队的后备人力资源,同时也影响科研新人的职业发展。分析科研新手获得学术认可的一般机制,对维护健康的学术环境,保持科学技术的可持续发展都具有重要意义。  相似文献   
110.
Traditional acculturation research has focused mainly on acculturative stress and its negative consequences on the mental health of migrants. However, there has recently been a substantial paradigm shift in acculturation research from a psychopathological perspective to a resilience framework, which focuses on positive adaptation outcomes and their contributing protective factors. The purpose of this study was to investigate how to improve the emotional well-being of migrants by developing and testing a resilience model of acculturation using mainland Chinese postgraduate students in Hong Kong as the sample. A total of 400 mainland Chinese students were recruited from six universities in Hong Kong through a cross-sectional survey. A resilience-based and meaning-oriented model of acculturation was developed for Chinese students by path analysis and structural equation modeling. Threat appraisal and sense-making coping partially mediated the relationship between acculturative hassles and negative affect. The effect of acculturative hassles on positive affect was mediated by two pathways: the first was mediated by threat appraisal, sense-making coping, and negative affect; the second was mediated by meaning-in-life. The findings suggest that acculturative hassles and threat appraisal are significant risk factors and that sense-making coping and meaning-in-life are important protective factors for psychological adjustment in cross-cultural adaptation.  相似文献   
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