THE EFFECT OF MEDIUM ON ADSORPTION OF FREE ACID BY CROSSLINKED CHITOSAN RESIN

The adsorption of free acid of low concentration by crosslinked chitosan resin was followed by electrochemical experimental technique.The effect of acid concentration and the media on adsorption was discussed.The experimental results show that both the apparent rate constant and the interaction energy between the adsorbent and adsorbate are decreased while the concentration of hydrochloric acid is increased.In the adsorption system.the adsorption was effected by addiiton of organic solvent.     

涡旋光在大学物理实验教学中的探究

涡旋光具有独特的强度和螺旋相位结构而备受人们的关注。基于涡旋光与铷原子相互作用，本文研究分析了入射光的频率、拓扑核数以及偏振状态等参量涡旋光束轮廓和能量分布的影响。实验结果表明这些参量可以实现对涡旋光空间分布的有效调制。我们的实验探索能让大学生对涡旋光有更深的理解，拓展他们的眼界。本实验研究也将在大学物理实验教学方面具有潜在的应用。     

虚拟机在课程实验中应用综述

高校教育中对实际操作能力要求越来越高,但现实情况是由于受到设备和资金方面的制约很多课程的实验教学达不到课程要求。利用虚拟机可以解决实验中设备不足的局面,完成教学要求。     

例说实验在教学重难点突破中的妙用

实验具有直观性、趣味性,用实验调动学生学习积极性是常用的教学方法.许多物理概念和规律都是通过运用实验来重现某种物理现象并通过观察、比较、分析、综合、归纳,使感性认识上升到理性认识的过程中建立和总结起来的.有趣的实验能有效刺激学生的感官,吸引学生注意力,也有利于发展学生的想象力和抽象思维能力,所做的实验不一定多么复杂,只要它能吸引学生,使学生充分感知,就能收到好的效果.     

Effects of clouds, sea surface temperature, and its diurnal variation on precipitation efficiency

The effects of clouds, sea surface temperature, and its diurnal variation on precipitation efficiency are investigated using grid-scale data from nine equilibrium sensitivity cloud-resolving model experiments driven without large-scale vertical velocity. The precipitation efficiencies are respectively defined in surface rainfall, cloud, and rain microphysical budgets. We mathematically and physically demonstrate the relationship between these precipitation efficiencies. The 2℃ increases in spatiotemporal invariant sea surface temperature (SST) from 27℃ to 29℃ and from 29℃ to 31℃, and the inclusion of diurnal SST difference 1℃ and the 1℃ increase in diurnal SST difference generate opposite changes in the precipitation efficiency by changing ice cloud-radiation interactions. The radiative and microphysical processes of ice clouds have opposite effects on the precipitation efficiency because of the rainfall increase associated with the reduction in the saturation mixing ratio caused by the exclusion of radiative effects and the decrease in rainfall related to the reduction in net condensation caused by the exclusion of deposition processes. The radiative effects of water clouds on the precipitation efficiency are statistically insensitive to the radiative effects of ice clouds.     

Experimental Verification of Left-Handed Metamaterials Composed of Coplanar Electric and Magnetic Resonators

We verified experimentally left-handed metamaterials （LHM） composed of coplanar electric and magnetic resonators. A typical LHM sample composed of coplanar resonator unit cells was fabricated, investigated and tested. The experimental results show that the tested sample has a left-handed band of width 1.4 GHz in the X band. The experimental results agree quite well with the simulation ones. Moreover, both the simulation and experimental results show that the LHM under study can automatically achieve good impedance-matching in the left-handed band.     

软件实验环境的建立

下面介绍怎样建立软件实验环境，即安装Microchip公司提供的MPLAB开发工具和HITECH公司提供的C编译器。     

数字显示恒流型电子负载机

笔者是从事铅酸电池充电器产品的设计工作的，通常充电器量产后，在出厂时需要进行4～8小时的满载老化实验，以确保产品质量稳定。最初，我们的做法是用实际的铅酸电池进行老化实验，但当出货量大时，需要购买很多颗电池才能满足出货量的要求，这给资金与仓库管理都带来了很大的压力。后来，我们采用大功率电阻来老化电源，     

DIS实验在初中物理教学中的应用初探

尝试将DIS实验引入初中物理课堂,发现初中物理的部分力学、热学、电学实验也可以使用传感器来做,且相对传统实验具有以下一些优点.     

MIT在线实验室

1998年，电子工程学教授热苏斯-德尔·阿拉莫（Jesdsdel Alamo）正在讲授晶体管物理学这门课，而授课过程曾让他倍感沮丧。“我那时教的学生中有大学生，也有研究生，但是他们都接触不到任何实验仪器。”阿拉莫说。“我认为让学生们有机会做实验非常重要，他们需要在简单电路上测试晶体管的特性，评估有多少在课堂上学到的东西能在实验室中真实地感触到。”