北京张坊地区中上元古界中岩溶发育与构造作用     

刘建明  张玉修  曾璐  琚宜文  芮小平  乔小娟 《中国科学院大学学报》2019,36(2):208-217

张坊岩溶地貌是中国北方岩溶类型的典型代表。分析张坊地区的地层展布与构造变形，探讨地层-构造演化与岩溶发育的关系。研究区主要出露近水平的中上元古界碳酸盐岩夹细碎屑岩和硅质岩，主要经历印支期（或更早期）伸展状态下的固态流变变形、燕山期的逆冲-褶皱变形和房山岩体期后的伸展变形等多期次构造演化，造就了研究区复杂的褶皱、断裂、构造裂隙和岩溶地貌特征。大型溶洞的发育主要与中上元古界的岩性-地层展布、中生代的逆冲断裂和新生代的伸展断裂等地质作用有关。在多阶段沉积-变形等地质作用控制下，发育了中元古代、古生代、中生代和新生代4期古岩溶，形成构造抬升侵蚀溶蚀、构造反转溶蚀冲蚀和多次抬升溶蚀侵蚀等3种主要溶洞发育类型。  相似文献   

Actions for sociopolitical consciousness in a high school science class: A case study of ninth grade class with predominantly indigenous students     

Bhaskar Upadhyay  Erin Atwood  Baliram Tharu 《科学教学研究杂志》2020,57(7):1119-1147

This case study explores how a group of Grade 9 students engaged in sociopolitical discourses and actions in a science class in a mostly indigenous student school in Nepal. The study used sociopolitical consciousness (SPC) as a framework to document and understand indigenous students’ SPC-oriented science interactions and subsequent social change actions. We used ethnographic methods of data collection over 6 months. The study focused on the actions of 4 girls and 2 boys belonging to the indigenous Tharu group. Data were analyzed using iterative qualitative methods. The study findings show that students are capable of engaging in critical thinking, critical reflecting, and taking actions for social change. Additionally, students are competent to link their experiences with social, structural, and political discrimination to the relevant science content they learn. The study presents four thematic findings related to SPC and science teaching and learning: Fostering social justice awareness in science class, fostering structural understanding of inequities in sickle cell disease, fostering sociopolitical actions for sickle cell disease, and the teacher's activist pedagogy for SPC in science learning. Implications of the study are that culturally relevant pedagogy helps indigenous students to become sociopolitically more aware of the links between science and social change. Adding aspects of critical pedagogies in science teaching could encourage students to become more sociopolitically reflective about science learning.  相似文献   

体育产业供给侧改革:投入要素、行动逻辑与实施路径——基于社会主要矛盾转化研究视角     

沈克印  吕万刚 《中国体育科技》2020,(4):44-51,F0003

通过文献资料调研、实地考察、专家访谈等方法,基于社会主要矛盾转化视角,对体育产业供给侧改革的投入要素、行动逻辑与实施路径进行研究。研究认为:1)中国特色社会主义步入新时代,社会主要矛盾的转化对体育产业供给侧改革提出了新要求,而体育产业供给侧改革可以有效破解体育产业中不平衡和不充分的发展问题;2)推进体育产业供给侧改革的核心工作是通过改革与创新,优化产业结构,提高劳动力、土地、资本、制度等要素的投入力度,提高全要素生产率;3)行动逻辑是构建“强政府-强市场”结合模式,不仅要用好政府“有形之手”,也要放开市场“无形之手”,发挥市场在体育资源配置中的决定性作用。具体实践中,通过深化体制机制改革、促进产业跨界融合、实施产业创新驱动、补齐产业发展短板等途径推进体育产业供给侧改革。  相似文献   

The context dependence of physics identity: Examining the role of performance/competence,recognition, interest,and sense of belonging for lower and upper female physics undergraduates     

Zahra Hazari  Deepa Chari  Geoff Potvin  Eric Brewe 《科学教学研究杂志》2020,57(10):1583-1607

While there is a growing body of work that examines disciplinary identity development, unlike qualitative work in this area, quantitative research has not fully incorporated the importance of different contexts, nor has it uniquely focused on underrepresented groups (in this case, women in physics). This study examines how the constructs posited by prior work as important for physics identity, as well as an additional theorized construct, may interrelate and affect female students' physics identity differently depending on the context. Context in this study refers to two different experiential levels in college. The constructs examined include performance/competence, recognition, and interest, as well as sense of belonging. In particular, we used structural equation modeling to examine the effect that these constructs have on the physics identity of two groups of female physics undergraduates: first year students and senior year students. The results reveal that the relationship of the theorized constructs with physics identity vary between the two groups as well as compared to prior research with broad college student populations (not just physics majors). Unlike broad college student populations, for our sample of female physics undergraduates, interest did not have a direct effect on physics identity while sense of belonging was significant only for senior year students. These results exemplify the importance of examining context or different types of student experiences when studying disciplinary identity development rather than generalizing previous frameworks to all contexts.  相似文献   

产学研科技创新的竞争力形成机理研究     

陈勇军  张飞涟  陈艳 《科技管理研究》2016,(7):24-29

采用半结构访谈与书面案例研究及实践现象观察的定性研究方法,提炼出产学研科技创新竞争力的主要影响因素,向固定的对象发放大量的调查问卷,基于结构方程模型的方法,运用SPSS18.0和AMOS7.0等统计软件进行数据分析和假设检验,研究产学研科技创新的竞争力形成机理,得到相关研究结论,并从产学研科技创新竞争力的4个主要影响因素等方面提出相关对策建议.  相似文献   

鄂州市莲花山地质特征     

黄运开  吕新华  周高志  刘永耀  齐定清  刘玉珠 《人天科学研究》1995,(5)

莲花山地处淮阳山字型前弧西翼,地壳组成主要是强烈钠长石化的中细粒闪长岩和斑状斜长花岗岩。由一系列断裂、节理(或劈理)组成、以格状构造为特征的现存构造格局显然是新华夏系构造迭加而造成的,力学结构面性质、特征显示它们形成于岩体冷却之后的脆性剪切应力作用。  相似文献   

基于消费者行为的奥运赞助效果实证研究     

冯文滔  胡波  楼春永 《软科学》2008,22(8)

从分析中国当代消费者行为出发,在华东地区进行问卷调研,采用结构方程模型评估奥运赞助营销的效果。实证结果说明中国企业在制定奥运赞助策略时要考虑中国当代消费者行为的特点,中国境内企业推行奥运赞助策略对于"消费者忠诚度"和"企业形象"可能会有显著提升,尤其对"消费者忠诚度"的影响较大,奥运赞助对于"消费者感知度"的影响相对较小。根据研究结论,提出了相应的策略建议。  相似文献   

基于结构方程的创新过程与组织关系模型研究     

刘希宋  喻登科  姜树凯 《科学学与科学技术管理》2007,28(9):65-69,180

综述创新过程的研究历程,以新视角参考构建创新过程与组织关系模型,在实证调查的基础上,利用结构方程模型,研究创新过程内部关联与组织职能内部关联对创新的影响。得出创新过程是一个连续发展的过程,前后互相关联,创新过程与组织职能之间互相作用,共同影响创新效果的结论,为企业创新提供借鉴。  相似文献   

能源技术进步对石油需求及节油减排潜力的影响——基于多因素视角的研究   总被引：1，自引：0，他引：1  

伍亚 《科技管理研究》2016,(5):199-203

从技术进步、结构调整、城镇化等角度出发,探讨我国石油需求的影响机制。研究表明,(1)技术进步对抑制石油增长的作用较小,其节油空间有待提升;(2)经济结构和城镇化是拉动石油需求的主因;(3)GDP、城镇化率与石油需求之间具有单向因果关系,以节油为目的的能源政策不会损害经济增长和城镇化推进。结合情景分析,评估2015—2025年节油减排潜力,提出未来节油减排的政策建议。  相似文献   

结构变化、适应效应、竞争态势——美日欧韩台企业在中国大陆的技术竞争     

俞文华 《研究与发展管理》2011,23(6):70-78

基于国内外企业在中国大陆的发明专利授权统计,首先对1996-1998年和2004-2006年两个时期间中国大陆市场上技术竞争的结构变化进行了揭示;其次,运用结构分解分析法,将美日欧韩台企业在中国大陆市场上所拥有发明专利份额的变化分解为技术份额效应、结构技术效应和技术适应效应的不同贡献,并对其技术竞争力和适应性进行了重点探讨;再次,从技术结构相似度及其变化入手,分析了美日欧韩台企业和大陆企业间的技术竞争性及其变化趋势;最后讨论了分析结果的公共政策含义.  相似文献