数学互动式数学与创造性思维

介绍了数学课堂教学互动式的教学方法，阐述了如何运用互动式数学不断提高学生的创造性思维。     

乌鲁木齐的轮虫与水质污染

本文根据1980—1986年的调查,对乌鲁木齐地区水体中轮虫的种类、分布、群落特征以及与水质污染的关系进行了探讨。记录轮虫73种,其种群组成以广温性、广盐性、浮游型为主。一些生态耐性强、嗜有机污染物的轮虫常成为优势种。近年来柴窝堡湖轮虫种群结构发生演变,说明该湖水质污染程度日趋严重。     

新课标三种高中化学必修教材的编写特点分析

本文对人教版、苏教版、山东科技版三种高中化学教材(化学1、化学2)的结构做了归纳和对比,从教材编写线索、学习栏目、插图与表格、实验探究等几个方面进行分析,阐述了作者对高中化学新课标和新教材的几点思考和建议。     

Influence of isothermal approximation on the phase-field simulation of directional growth in undercooled melt

By using the phase-field approach,we have simulated the directional growth of alloys in undercooled moten states under the isothermal and nonisothermal conditions.The influences of the isothermal approximation on simulation results are discussed.We found that for undercooling greater than 25K,the isothermal approximation overestimates the interface growth velocity and reduces a critical velocity for an absolute stable planar interface,thus in this simulation,the uinterface morphology shows the plane-cell-plane transition with increasing initial undercooling of the mele,and the planar interface obtained under a large undercooling is absolutely stable.Whereas in the nonisothermal simulation,only plane-cell transition occures in the same range of the initial undercoolings of the melt,and the planar interface tends to be destabilized and evolve into cells.     

飞秒激光诱导有机薄膜自组装微结构

通过改变辐照激光脉冲数、激光的平均功率、显微镜物镜倍数/数值孔径等研究微皇冠结构形成与加工条件的关系,并借鉴激光熔池形成和液滴溅射的模型对其进行理论分析。当激光脉冲数达到一定数量后,烧蚀区域会出现微皇冠结构。烧蚀区域尺寸的改变是由于形成的液体区域中热毛细作用和化学毛细作用共同所致;微皇冠结构溅射个数的改变是由于形成的气体因多光子吸收体积迅速膨胀所致。     

殊途不同归

我们目前所用教辅资料[1]正弦定理和余弦定理的综合应用一节中有这样一道练习题：     

Microstructure-Fibre-Based Optical Parametric Amplification in Telecom Band with Ultra-High Gain Slope

We report a microstructure-fibre-based parametric amplification experiment in telecom band with ultra-high gain slope. A peak on-off gain of 52.3 dB is achieved using 25m high nonlinear microstructure fibre （MF） and only 5.3 W pump power. The parametric gain slope is up to 580dBW^-1km^-1. From the experimental data, the linear coefficient of the MF is estimated to be about 66.7 W^-1 km^-1, The experiment shows the great potential of MFs in practical fibre parametric amplifiers.     

高温转动核的电偶极巨共振研究

简要叙述了高温转动核电偶极巨共振实验研究的历史和现状，并着重介绍了现存的一些问题及新的探索． The history and current status of the experimental study of giant dipole resonance in hot rotating nuclei has been reviewed.Some open problems and new development are stressed.     

用差频方法演示可闻声多普勒效应

可闻声多普勒效应的传统演示方法,是让观察者直接听运动声源发出的声音,从而鉴别音调或频率的变化。我们感到这种演示方法存在如下两个问题:第一、要让现察者能听到音调有明显的变化,就要求声源的运动速度较高,而在通常实验条件下,这一要求并不容易达到。当运动速度不高时,多普勒频移量很小,一般人耳要分辨微小的频移是比较困难的,因而演示效果不明显;第二,当声源运动发生多普勒频移的同时,观察者所听到的声强也在发生变化,这对鉴别多普勒频移效应又增加了困难。为了克服上述困难,我们采用了差频方