实现师生间的良好互动

在新课程改革的背景下，教师们都在探索如何按新的教学理念激发学生兴趣，达到合作学习、共同发展这一目标。那么，在实际教学中，怎样才能产生真正的合作学习、积极互动呢？笔者认为应从以下几个方面着手。     

本科生虚拟公司拓宽实践教学改革思路

在大学生中开展创业教育,造就具有创业意识和创业能力的开创型人才,以增强毕业生的就业能力,增加获得未来职业的成功机会,成为当前大学生实践教学过程中所面临的重要课题。本科生虚拟公司为实践教学改革拓宽了新的研究思路。     

课程改革与教师角色的转变

一、传统知识传授者的角色表现1.传统的教学是教师讲 ,学生听的单向传输方式 ,教师单独拥有权力 ,学生只能在教师的控制和监督下进行学习。2 .教学中以知识传授为主 ,学生的情感、态度、价值观受教师的关注不够 ;学生的任务和责任就是彻底的“应试”和接受评定。二、传统知识传授者角色形成的原因1.教师是惟一的知识拥有者 ,学生是知识的接受者 ,学生对知识的认可 ,是通过教师的确认 ,才能承认知识的正确性 ,甚至在现实中 ,经常会听到 :我们老师说的怎样、怎样……2 .以教师为中心 ,书本为中心 ,课堂为中心……。学生获取知识的途径只限天教…     

Silicon carbide nanotubes with special morphology prepared by super critical hydrothermal method and photoluminescence character

Silicon carbide nanotubes (SiCNTs) with special morphology synthesized by supercritical hydrothermal method at 470 °C and 8 MPa have been reported in this paper. SiCNTs with special morphology were characterized by transmission electron microscopy (TEM) and high-resolution TEM (HRTEM). There are two kinds of silicon carbide with special morphology: One is oval SiCNTs with small aspect ratio, the other is bamboo cone-shape structure. SiCNTs have been analyzed by fluorescence spectrometer. The results indicate that the SiCNTs have strong photoluminescence (PL) property. The SiCNTs with oval shape are one kind of intermediate state of growth process of nanotube. The growth mechanism of silicon nanotubes has been proposed based on experiment data. The investigations of growth mechanism of SiCNTs with bamboo structure show that the defect produced in the growth process play the important role in SiCNTs with special structure.