PAA@Co复合薄膜的制备及光学特性研究     

杨淑敏  朱玉燕  韩伟  顾建军  岂云开 《承德师专学报》2015,(2)

在磷酸电解液中,利用一次阳极氧化工艺成功的制备了具有结构色的多孔氧化铝薄膜。采用交流电沉积方法在氧化铝薄膜的孔洞中沉积金属Co纳米线,得到了高机械强度且具有高饱和度结构色的复合薄膜。控制氧化时间,可以调控复合薄膜结构色的颜色。采用遮挡法,结合多次电沉积工艺,成功的制备出具有彩色图案的复合薄膜。理论分析了薄膜结构色的变化与其微观结构的关系,结果显示,理论分析和实验结果相吻合。  相似文献   

高校专业设置与大学生结构性失业的关系问题初探     

Dong Li 《佳木斯教育学院学报》2015,(4)

高校专业设置滞后于市场需求,且专业的人才培养过程与社会对应用型人才的实际需求脱节,因而导致大学生专业结构性失业。可采取以下对策:高校结合区域发展目标错位发展,前瞻性地进行专业布局,以能力培养为导引,坚持特色育人,提升人才培养对社会需要的适应性。  相似文献   

Revisiting Zhang’s scale of transactional distance: refinement and validation using structural equation modeling     

Ravi C. Paul  William Swart  Aixiu Monica Zhang  Kenneth R. MacLeod 《Distance Education》2015,36(3):364-382

Transactional distance has been defined as barriers to students’ engagement with learning in the online environment. This research updates Zhang’s (2003) scale of transactional distance, which quantified the extent of the barriers, in light of the massive changes in today’s web-based learning environment. The resulting revised scale of transactional distance (RSTD) is a parsimonious version with 12 elements (compared to 31 original) that measure the transactional distance between student and teacher, student and student, and student and content. The RSTD has excellent factorial validity and reliability, yields better fit statistics, and is easier and less time-consuming to apply. The transactional distance values are unique predictors of student satisfaction, which is correlated to learning and persistence (a major concern with massive open online courses). This information can form the basis for a systematic approach to improving the design of today’s contemporary open, flexible, distance education courses and thus serve as a valuable tool for researchers and educators alike.  相似文献   

Teacher change beliefs: validating a scale with structural equation modelling     

Tai Mei Kin  Omar Abdull Kareem  Mohamad Sahari Nordin  Khuan Wai Bing 《School Leadership & Management》2015,35(3):266-299

The objectives of the study were to validate a substantiated Teacher Change Beliefs Model (TCBM) and an instrument to identify critical components of teacher change beliefs (TCB) in Malaysian secondary schools. Five different pilot test approaches were applied to ensure the validity and reliability of the instrument. A total of 936 teachers from 47 high-performing secondary schools completed the survey. Structural equation modelling was applied to test the models. Exploratory factor analysis was employed to identify the underlying factors, whereas confirmatory factor analysis was applied to test the measurement models. The analysis yielded a three-factor TCBM: (1) discrepancy, (2) efficacy and (3) principal support. The results demonstrated a good fit of the model: normed χ² = 3.156, Tucker-Lewis Fix Index = .987, Comparative Fix Index = .991 and Root Mean Square Error of Approximation = .048. The results also provided evidence for convergent validity, discriminant validity and construct reliability. The TCBM is an empirically tested model derived in a local Malaysian cultural education setting. It provides direction for practitioners in planning and designing training programmes of change management for school principals in the enhancement of TCB among teachers in schools. Besides, Teacher Change Beliefs Scale is a promising and welcome tool for both practitioners and researchers. With only nine items, it is easy to administer and not time-consuming.  相似文献   

中国谷物价格波动的传递路径解析     

涂涛涛  李崇光  张玉梅 《华中科技大学学报(社会科学版)》2015,(3):53-62

本文运用结构路径分析法,选取行业与生产要素等成本因素,探讨了中国谷物价格波动的传导机制。分析结果表明：一方面,不同行业中间投入及生产要素对谷物价格影响的传递机制存在差异。其中,化肥、农药、种子费、水电、物流与仓储、农业生产支持性服务、非熟练劳动力及土地成本的变化会对谷物价格产生显著直接影响;而其他行业、熟练劳动力和资本对谷物的价格冲击主要通过间接路径来传导。另一方面,从谷物价格冲击对居民的影响来看,无论是城镇居民或农村居民,低收入群体受谷物价格冲击的影响较大,收入相对较高群体受间接路径冲击的影响较大。  相似文献   

后疫情时期中国武术产业高质量发展的实现路径     

芦胜男  马勇志  张继东 《首都体育学院学报》2021,(2)

后疫情时期是指新型冠状病毒肺炎疫情得到有效控制,疫情防控从突发式防控向常态化防控转变,中国整个社会经济发展及居民日常生活逐渐恢复常态的阶段。在此阶段,中国武术产业受新型冠状病毒肺炎疫情的影响,出现了武术产业链延展停滞、武术产品与服务资源配置“失灵”的现象。后疫情时期迫切需要创新我国武术产业高质量发展路径。运用文献研究法、逻辑分析法等,以“供给侧结构性改革”为指导思想,以《武术产业发展规划(2019—2025年)》为主要政策依据,以弘扬中华体育精神、传播武术文化、满足民众武术产品与服务消费需求、增进人民健康为立足点,提出后疫情时期中国武术产业高质量发展的实现路径:1)弘扬中华体育精神:坚定中华武术传承与发展的文化自信;2)满足民众健康促进需求:加强我国武术公共服务供给;3)提升中国武术产业能级:创新中国武术产业链;4)调整中国武术产业结构:加强武术产业供给侧结构性改革;5)促进中国武术服务业发展:加强对武术服务业的统筹规划与监管。  相似文献   

The validity of student ratings of teaching quality: Factorial structure,comparability, and the relation to achievement     

《Studies in Educational Evaluation》2023

Student ratings are widely used to assess teaching quality in primary and secondary education. This necessitates a thorough examination their validity and reliability in such contexts. To this end, we present validity evidence for using student ratings of teaching quality based on their factorial structure, comparability across grades and subjects, and relation to achievement. Based on data from the 2019 Trends in Mathematics and Science Study (TIMSS) and its national extensions in Norway (N = 3951 5th graders and N = 4575 9th graders), we could confirm a theoretically assumed three-dimensional factor structure (i.e., classroom management, cognitive activation, and supportive climate). Moreover, classroom management and supportive climate were more comparable across grades and subjects then cognitive activation. Finally, classroom management was associated with achievement across all groups, whereas other dimensions showed mixed results, especially across grades. Overall, the findings indicate that students, especially in Grade 9, can provide a valid assessment of teaching quality.  相似文献   

How do thinking styles and STEM attitudes have effects on computational thinking? A structural equation modeling analysis     

Haozhe Jiang  A. Y. M. Atiquil Islam  Xiaoqing Gu  Jia Guan 《科学教学研究杂志》2024,61(3):645-673

Computational thinking (CT) is vital for success in numerous domains. However, the nature, definition, and scope of CT are ill-defined, and research on how best to develop CT is very limited. This study focused on how thinking styles and STEM attitudes have effects on computational thinking. Using a proportionate stratified random sampling procedure, 1195 students from two universities were surveyed. A structural equation modeling analysis showed that students' thinking styles and STEM attitudes directly predicted their computational thinking skills and that thinking styles mediated the relationship between STEM attitudes and computational thinking skills. Thinking styles and STEM attitudes are strong predictors of CT skills. Based on the results, we recommended that the conceptualization of CT be broadened to reflect its trans-disciplinary nature within the context of STEM education. This study adds to the limited theoretical understanding of CT and CT-predictors in higher education, which has been studied much less than in K-12 education.  相似文献   

绿色供应链管理视角下港口绿色绩效及竞争力研究——基于沿海港口的问卷数据     

顾磊  曲林迟  甘爱平  沈宫阁 《科技管理研究》2014,(23)

伴随港口竞争的加剧,港口的可持续发展越来越受到重视。从全球绿色供应链管理的视角出发,选取沿海三大港口群的中高层管理者为调查对象,运用两阶段的结构方程模型对当前港口供应链管理过程中港口的绿色绩效相关关系进行验证。结果表明:港口的外部绿色合作和内部绿色实践不仅对于港口绿色绩效存在明显的正反馈,还对提升港口竞争力有正向反馈;绿色政策法规的制定与实施对于港口外部绿色合作与内部绿色实践具有正反馈。并基于此给出我国港口在绿色实践过程中提升绿色绩效的相应启示。  相似文献   

PE/VC网络特征与家族企业技术创新     

杨勇  王齐晗 《软科学》2014,(11):10-14

选取1999²011年PE/VC共同投资事件,构建PE/VC联合投资网络,探讨PE/VC网络特征与家族企业技术创新的关系,研究发现:PE/VC介入的家族企业的R&D投入和专利产出均高于没有PE/VC介入的家族企业,且PE/VC投资的金额越多,家族企业的R&D投入和专利产出也越高;处于网络中心位置的PE/VC有利于提高被投资家族企业的R&D投入和专利产出;富含结构洞的PE/VC对新创家族企业的技术创新有正向影响;拥有较多间接联系的PE/VC对家族企业技术创新有正向影响。  相似文献