Determining threshold default risk criterion for trade credit granting

To solve the problem of setting threshold default risk criterion to select retailer eligible for trade credit granting, a novel method of solving simultaneous equations is proposed. This method is based on the bilevel programming modeling of trade credit decisions as an interaction between supplier and retailer. First, the bilevel programming is set up where the supplier decides on credit terms at the top level considering a retailer‘s default risk, and the retailer determines the order quantity at the lowe...     

关于大学英语阅读教学的思考

本文分析了大学英语阅读教学中存在的问题,并结合当前的英语阅读考试的特点,提出促进学生阅读能力的培养和提高化解问题的途径和方法.     

离子色谱抑制器的历史及发展

描述了离子色谱抑制器的历史及发展。新的抑制器对于使用者无须太多的介入 ,主要是通过电解去离子水产生抑制中和反应所需的酸和碱 ,能够永久的再生和抑制。抑制器与其它仪器结合 ,如抑制器与淋洗液发生器的结合使用 ,推动了离子色谱的发展     

不同运动坐标系中波谱的转换

利用洛仑兹变换，可导出运动坐标系中观察到的波谱与静止坐标系中观察到的波谱之间的转换关系，并可得出由于速度不同时运动坐标系中波谱的表达式．在低速情况下（v<相似文献   

应用型本科院校大学生创新实践课程教学研究——以五邑大学材料科学与工程专业中《新能源材料与器件专业综合训练》为例

文章以五邑大学材料科学与工程专业中的综合创新实践课程——《新能源材料与器件专业综合训练》为例,探讨了应用型本科院校大学生创新课程的教学实践,通过项目式实践教学,循序渐进地开展不同层次的项目课题研究,课题来源于企业实践、教师科研和学生科技创新等项目。着力培养学生综合利用知识去研究和解决行业中复杂工程问题的能力,培养学生自主学习和终身学习的能力,以及创新和团队合作的能力。     

基于网络教学平台的混合式教学模式建构

教学改革是高等教育改革的难点问题。当前,互联网+背景下慕课与翻转课堂的融合是教学改革的热点,本文构建了混合式教学具体措施:课程典型问题集、典型案例库和立体化教材资源库构建、MOOC或SPOC+线上线下交互活动、SPOC+翻转课堂教学模式和范式,并提出改革意义,对教学改革具有一定的参考价值和指导意义。     

儿童依恋类型的影响因素分析及安全型依恋的培养

本文对影响依恋形成的几个因素进行了分析，这些因素来自父母、家庭以及儿童自身三方面，并且针对这些影响因素我们提出了相应的应对策略，对于培养安全型依恋的儿童具有重要参考价值。     

Effects on cytotoxicity and antibacterial properties of the incorporations of silver nanoparticles into the surface coating of dental alloys

The aim of this study was to research the changes in cytotoxicity and antibacterial properties after silver nanoparticles (AgNPs) were incorporated into the surface coating of dental alloys. AgNPs were attached to cobalt chromium alloys and pure titanium using a hydrothermal method, according to the reaction: AgNO₃+NaBH₄→ Ag+1/2H₂+1/2B₂H₆+NaNO₃. A 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay was used to evaluate the cytotoxicity of the alloys when in contact with osteogenic precursor cells (MC3T3-E1) from mice and mesenchymal stem cells (BMSC) from rats. The antibacterial properties of dental alloys incorporating three different concentrations (10, 4, and 2 μmol/L) of AgNPs were tested on Staphylococcus aureus (SA) and Streptococcus mutans (MS). High cytotoxicity values were observed for all dental alloys that contained 0% of AgNPs (the control groups). The incorporation of AgNPs reduced cytotoxicity values. No significant difference was observed for antibacterial performance when comparing dental alloys containing AgNPs to the respective control groups. The results demonstrated that the cobalt chromium alloys and pure titanium all had cytotoxicity to MC3T3-E1 and BMSC and that the incorporation of AgNPs could reduce this cytotoxicity. The concentrations of AgNPs adopted in this study were found to have no antibacterial action against SA or MS.     

The effectiveness of self-regulated learning scaffolds on academic performance in computer-based learning environments: a meta-analysis

This meta-analysis examined research on the effects of self-regulated learning scaffolds on academic performance in computer-based learning environments from 2004 to 2015. A total of 29 articles met inclusion criteria and were included in the final analysis with a total sample size of 2648 students. Moderator analyses were performed using a random effects model that focused on the three main areas of scaffold characteristics (including the mechanism, functions, delivery forms, mode, and number of scaffolds; how to promote self-regulated learning by scaffolds); demographics of the selected studies (including sample groups, sample size, learning domain, research settings, and types of computer-based learning environments); and research methodological features (including research methods, types of research design, types of organization for treatment, and duration of treatment). Findings revealed that self-regulated learning scaffolds in computer-based learning environments generally produced a significantly positive effect on academic performance (ES = 0.438). It is also suggested that both domain-general and domain-specific scaffolds can support the entire process of self-regulated learning since they demonstrated substantial effects on academic performance. Different impacts of various studies and their methodological features are presented and discussed.     

普通高校健美操运动员赛后心理调适方法研究

随着我国各高校竞技健美操训练水平的提高,运动员在比赛中所感受到的赛场心理压力体验势必更加深刻和久远。比赛结果的好坏往往都会对运动员造成一定的心理影响,如果不及时采取措施进行干预,这将会影响运动员赛后正常的训练和比赛。本文尝试分析竞技健美操运动员在赛后可能会出现的心理体验表现,探讨了在赛后的训练中可以采用的几种较实用的心理调适手段。