"双诱式"数学解题教学模式探析

“双诱式”数学解题教学模式,克服了传统的填鸭式教学,变教为诱,变学为思,以诱达思,促使学生主动探究、解决问题,从而使分析、解决问题能力得到提高。     

新世纪电大“生存和发展”空间浅析

社会需求和对受教育对象开放是广播电视大学赖以生存和发展的基础。21世纪，这个基础随着现代化建设的进程以及城镇化战略的实施逐步加强，电大获得了前所未有的发展机遇。电大应在人才质量、考风考纪建设、壮大办学实力、构建终身教育体系等方面作出努力，才能抓住机遇，求得更大的发展。     

Depolymerized konjac glucomannan: preparation and application in health care

Konjac glucomannan (KGM) is a water-soluble polysaccharide obtained from the roots and tubers of konjac plants. Recently, a degraded product of KGM, depolymerized KGM (DKGM), has attracted attention because of its low viscosity, improved hydrophily, and favorable physiological functions. In this review, we describe the preparation of DKGM and its prebiotic effects. Other health benefits of DKGM, covering antioxidant and immune activity, are also discussed, as well as its safety. DKGM could be a candidate for use as a tool for the treatment of various diseases, including intestinal flora imbalance, and oxidative- and immune-related disorders.     

"用油膜法估测分子的大小"的几点做法

针对“用油膜法估测分子的大小”实验在操作中存在的问题,从器材的选用、制作和实验方法上进行了改进,利用自制的滴管和撒粉器,采用自由滴的方法进行实验,提高了实验的成功率和实验结果的隹确度.     

Toxicity testing of four silver nanoparticle-coated dental castings in 3-D LO2 cell cultures

To address the controversial issue of the toxicity of dental alloys and silver nanoparticles in medical applications, an in vivo-like LO2 3-D model was constructed within polyvinylidene fluoride hollow fiber materials to mimic the microenvironment of liver tissue. The use of microscopy methods and the measurement of liver-specific functions optimized the model for best cell performances and also proved the superiority of the 3-D LO2 model when compared with the traditional monolayer model. Toxicity tests were conducted using the newly constructed model, finding that four dental castings coated with silver nanoparticles were toxic to human hepatocytes after cell viability assays. In general, the toxicity of both the castings and the coated silver nanoparticles aggravated as time increased, yet the nanoparticles attenuated the general toxicity by preventing metal ion release, especially at high concentrations.     

解四阶抛物型方程的一族恒稳隐式格式

对四阶抛物型方程构造一族新的含参数隐式差分格式，它包含了许多名格式，适当选取参数时，可得到一个高精度恒稳格式，其截断误差达到O[（Δt)^2 (Δx)^6)]，数值例子表明该格式是有效的。     

社会转型时期中小学德育创新

社会转型时期的教育改革把德育摆到了教育的首要位置,为顺应教育改革发展的形势,德育必须在观念、内容、方法以及管理诸方面创新。     

“偏狭”：明代七子派文学复古运动的致命伤

明代七子派文学复古运动最大的失误和弊端就是“偏狭”与“摹拟”，其“偏狭”之处主要表现在口号的偏激、对法的过分追求及门户党社观念的盛行等几个方面，由此导致复古运动最终走向摹拟之途和颓败结局，并使七子派成为明代文坛永恒的悲剧角色。     

英国职业教育透析及其给我们的启示

英国是世界上最早实施职业教育的国家之一。英国商务部根据1909年英国政府颁布的劳动力交流法所建立的“雇佣交流所”的下面就设有“青少年职业服务部”，青少年职业服务部主要就是帮助青少年选择职业。     

Stability and electronic spectra of C76N2 isomers

INTRODUCTION The synthesis and characterization of het-erofullerenes are very challengeable research topics because of application in superconductivity, photo-electronics, organic magnetism and even nanotubes. Pradeep et al.(1991) studied the interaction between nitrogen and fullerenes and obtained nitrogen deriva-tives of C60 and C70 such as C59N2, C59N4, C59N6 and C70N2 by contact-arc vaporization of graphite in a partial N2 or NH3 atmosphere. Yu et al.(1995) syn-thesized carbon n…