构建助力学生全方位成长的化学实验课程助教体系

Based on decades of experiences on involving teaching assistants for laboratory teaching, College of Chemistry and Molecular Engineering at Peking University developed a complete set of teaching assistant management regulations and guidelines, including recruitment, lab-teaching training, supervising, and performance assessment of teaching assistants, to effectively improve laboratory teaching and to provide a platform which is beneficial to multi-dimensional development as well as future career of undergraduates.     

Bound state solutions of d-dimensional Schrdinger equation with Eckart potential plus modified deformed Hylleraas potential

We study the d-dimensional Schrdinger equation for Eckart plus modified deformed Hylleraas potentials using the generalized parametric form of Nikiforov-Uvarov method.We obtain energy eigenvalues and the corresponding wave function expressed in terms of a Jacobi polynomial.We also discuss two special cases of this potential comprised of the Hulthen potential and the Rosen-Morse potential in three dimensions.Numerical results are also computed for the energy spectrum and the potentials.     

职中物理教学网络资源的使用

职业教育就是就业教育,中等职业教育就是在九年义务教育的基础上培养高素质劳动者.基于这种定位,作为文化基础课的职校物理课程应淡化知识和技能教学,突出物理课程的基础和应用特点,让学生广泛涉猎,拓宽眼界,增长才干.飞速发展的信息技术改变着人们的思维方式和学习方式,在这种形势下,职中物理教学也应该利用当今技术发展的成果,发挥资源优势,解决职中物理教学中的困境.     

Modular invariance and anomaly cancellation formulas

By studying modular invariance properties of some characteristic forms, we get some new anomaly cancellation formulas. As an application, we derive some results on divisibilities on spin manifolds and congruences on spin ^c manifolds.     

三角形中一个优美的向量结论及空间推广

笔者在研究三角形中的向量形式时，发现了一个优美的结论，并可推广到四面体中，先证两个引理．     

幼儿珠心算教学中的趣味教学法

<正>幼儿期的孩子好奇、好玩、好动,而且精力总是比较旺盛。他们不喜欢单调枯燥的训练,只有趣味的教学形式才能吸引和激发积极参与、主动学习的兴趣。我带的是小班,孩子年龄都在4岁左右,注意力特     

从IB化学谈IBDP课程与国外大学的衔接

国际文凭大学预科课程（IBDP课程）是在全球被认可的具有较高学业水平的大学预科项目，以IBDP化学课程为切入点，从课程目标、课程大纲与要求、课程评估方式，结合大学对IBDP课程的认可来进行全面分析，探讨IBDP课程的设置与国外大学的衔接。     

“若命题f（x）≥0，则其否定为f（x）〈0”的说法对吗？

我们知道，含有变元的语句不是命题，因为它不能判别真假，如x-3〉0，这不是命题，逻辑上称之为“命题形式”或俗称为“开语句”．这一类语句如果要成为命题，必须前面加上量词，全称量词或存在量词．比如，语句f（x）≥0前面加上全称量词，得全称命题：对所有的x，有f（x）≥0，其否定为存在命题：存在z，有f（x）〈0；