电子商务中综合应用数据挖掘技术的新方案

电子商务伴随着各种购物网站的蓬勃兴起在人们的日常生活中起到了越来越重要的作用,而新兴的数据挖掘技术的应用有效地促进了电子商务活动。本文介绍了常用的数据挖掘技术,并提出了一种如何有效地结合这些技术来提高效率,促进消费的分类分层及内置搜索引擎的新方案。     

实现教育信息化培养良好信息素养

阐述了信息素养和教育信息化的涵义,从当前学校信息技术教育的现状出发,分析了培养信息素养的必然性,论述了在培养信息素养的过程中开展的信息技术教育的教学目标与学科性质.     

The Electrochemical Performance of Ml0.7Mm0.3Ni3.7Co0.7Mn0.4Al0.2 Nanocrystalline Hydrogen Storage Alloy as Metal Hydride Electrode

Ml0.7Mm0.3Ni3.7Co0.7Mn0.4Al0.2 nanocrystalline hydrogen storage materials are prepared by melt-spinning(MS).X-ray diffraction is used for the measurement of the nanocrystalline size.Compared to the electrode of polycrystalline alloys,the property of activation MH9metal hydride)electrode of the alloys with nanometer scale became worse and the inital discharge capacity decreased.It may be ascribed to the decrease of the total amount of rare earth metals and the increase of oxygen on the surface from the analysis of components of the alloys.After heat-treatment,the electrochemical performance of MH electrode of as-spun alloys could be improved,which could be attributed to the alleviation of the lattice strain.     

When is the best time to use rubrics in flipped learning? A study on students’ learning achievement,metacognitive awareness,and cognitive load

ABSTRACT

Rubrics can guide teachers to provide effective feedback and students’ peer- and self-assessment. This paper examines the effect of rubric use in flipped learning activities on students’ learning achievement, metacognitive awareness, and cognitive load through a quasi-experiment. A total of 83 university students were randomly assigned to an experimental group or a control group. The students in the experimental group were given rubrics in performing pre-class learning activities on the cloud platform, while those in the control group used rubrics in post-class assessment and modification of their finished works. The results show that rubric use can assist flipped learning by improving students’ learning achievement and metacognitive awareness, while reducing their cognitive load. Using rubrics before in-class work can yield stronger benefits in raising metacognitive awareness and lessening cognitive load. Moreover, the study reveals that students tend to hold a generally favorable attitude toward rubric use. These findings imply that appropriate use of rubrics in flipped learning has the potential to create a more efficient and learner-friendly condition to enhance self-regulated learning.     

论人口与经济的协调发展

人口发展与经济发展之间的关系 ,是马克思主义关于“两种生产”理论的具体体现。经济发展决定人口发展 ,人口发展要与经济发展相适应。本文就这二者的关系及在知识经济时代知识经济与人口发展的关系做了进一步的阐析     

Mathematics Achievement of Children in China and the United States

First and fifth graders in Beijing and Chicago were given a battery of mathematics test. Whether tested with problems requiring solely computation or with ones requiring application of knowledge about mathematics, American children's performance was consistently inferior to that of Chinese children. Interviews with American children suggested that they like mathematics, believe they are doing well in mathematics, and do not perceive mathematics as a difficult subject. American children's poor performance appears to be attributable, in part, to low motivation for devoting more attention to mathematics. Low standards held by American parents for academic achievement and lower interest in teaching mathematics by American teachers appear to contribute to American children's poor performance.     

Change in the body temperature of healthy term infant over the first 72 hours of life

INTRODUCTIONMeasuringbodytemperaturehaslongbecomeanindispensablemeansfortheevaluationofapa-tient抯generalhealthstatus.Temperatureasoneofthekeyfactorsinphysiologicalhomeostasisissubjecttominuteregulation,whilebeingareadilyaccessiblediagnosticindicatoraswell.Circadianrhythmswerereportedinnewbornsasearlyasonthe2nddayoflife(Sitkaetal.,1994).Likewise,avarietyofotherbenignfactors,suchasenviron-mentaltemperature,seasonalvariations,stateofarousal,metabolicstate,ethnicityandothers,arealsoknowntoaf…     

Effects of pre-pregnancy body mass index and gestational weight gain on neonatal birth weight

To evaluate the effects of maternal pre-pregnancy body mass index (pre-BMI) and gestational weight gain (GWG) on neonatal birth weight (NBW) in the population of Chinese healthy pregnant women, attempting to guide weight control in pregnancy. A retrospective cohort study of 3772 Chinese women was conducted. The population was stratified by maternal pre-BMI categories as underweight (<18.5 kg/m²), normal weight (18.5–23.9 kg/m²), overweight (24.0–27.9 kg/m²), and obesity (≥28.0 kg/m²). The NBW differences were tested among the four groups, and then deeper associations among maternal pre-BMI, GWG, and NBW were investigated by multivariate analysis. NBW increased significantly with the increase of maternal pre-BMI level (P<0.05), except overweight to obesity (P>0.05). The multivariate analysis showed that both pre-BMI and GWG were positively correlated with NBW (P<0.05). Compared with normal pre-BMI, underweight predicted an increased odds ratio of small-for-gestational-age (SGA) and decreased odds ratio for macrosomia and large-for-gestational-age (LGA), and the results were opposite for overweight. With the increase of GWG, the risk of SGA decreased and the risks of macrosomia and LGA increased. In addition, in different pre-BMI categories, the effects of weight gain in the first trimester on NBW were different (P<0.05). NBW is positively affected by both maternal pre-BMI and GWG, extreme pre-BMI and GWG are both associated with increased risks of abnormal birth weight, and maternal pre-BMI may modify the effect of weight gain in each trimester on NBW. A valid GWG guideline for Chinese women is an urgent requirement, whereas existing recommendations seem to be not very suitable for the Chinese.     

最佳关联与英文广告隐喻翻译——广告翻译的认知语用学视角系列之一

本文从关联理论最佳关联角度探讨英文广告隐喻的翻译。文中提出最佳关联是其指导原则,探讨了影响译者策略选择的相关因素,据此介绍五种基本策略以及在此基础上的动态组合策略,显示其有极佳的动态解释力。译者要综合考虑以求在多种因素之间达到平衡,选择一种或者多种策略组合,以实现广告译文的最佳效果。最佳关联原则并不排斥其它相关原则。     

青少年视觉素养教育探究

人类进入图像时代,语言文化与视觉文化发生了地位上的变化。Web2.0时代网络由于其可写性,视觉文化的传播因此变得更加广泛、快捷。青少年作为各种视觉网站的最大用户群体,其视觉素养教育意义非凡。主要体现在四个方面:培养视觉审美、防止视觉污染、引导青少年进行视觉文化创造、传承民族文化与价值观念。本文也提出了一个具体的如何提高青少年视觉素养的模式。