电子实验类教学的实践与体会

探讨电子实验类教学的目的意义，从几个方面分析方法与效果的关系，小结实施过程中的经验体会。     

光学实验室网络教学平台的设计

传统的多媒体课件正在受到网络使用环境挑战，取而代之将是基于网而设计的多媒体教学平台。利用FIASH、Cult3D等技术开发的基于网络环境的虚拟实验室案的提出将为大学物理实验开辟一个崭新的多媒体教学方案。     

不同幅值过电流下的高温超导线材失超发展过程

对高温超导材料的失超特性的研究是超导电力科学技术中的重要课题 ,为此 ,本实验室进行了大量的实验工作。在此基础上 ,文中整理了部分高温超导实验数据 ,对其进行分析和归纳总结 ,提出了高温超导线材失超三阶段理论     

Difference between real-life escape panic and mimic exercises in simulated situation with implications to the statistical physics models of emergency evacuation: The 2008 Wenchuan earthquake

In constraining the statistical physics models of emergency evacuation, difference between real-life escape panic and simulated experiment is one of the key issues. We collected and analyzed some of the video recordings of the May 12, 2008, Wenchuan magnitude 8.0 earthquake in southwest China. These video cameras were originally deployed for security purposes, and the earthquake scene records are available from the internet. Analyzing one outdoor scene and three indoor scenes, it is observed that the relation between the arrival time and the order of the person arriving shows a nonlinear variation, which is different from simulated exercises in which this relation appears linear.     

正弦波与方波磁光调制的比较分析

基于正弦波磁光调制原理，同时利用利萨如图形方法，对正弦波磁光调制和方波磁光调制进行了计算机模拟．模拟结果表明，正弦波磁光调制具有磁光调制原理所描述的基本特性，并且其偏振角度检测准确度可达到0．001°；而方波磁光调制具有更好的应用特性，不存在波形失真问题，其氏取值不受小角度条件的限制，其偏振角度检测准确度可高于0．001°．对两种磁光调制进行的对比性实验研究，进一步支持了以上结论，表明方波磁光调制无论用于信号调制或用于偏振角度检测都具有独特的优势．另外，在实验中发现了两种磁光调制的限幅效应，并对其形成的原因进行了初步分析．     

PIN限幅器PSpice模拟与实验研究

 从PIN二极管基区双极载流子扩散方程出发，通过拉普拉斯变换求解得到PIN二极管子电路模型，从而通过PSpice软件瞬态数值模拟得到了PIN限幅器的尖峰泄漏、平顶泄漏与脉冲功率、上升时间关系。对于I层厚度一定的限幅器，模拟与实验表明脉冲前沿越大，尖峰泄漏功率插入损耗越大，脉冲前沿过缓则可能没有尖峰泄漏现象；尖峰泄漏功率随着输入功率的增加而变大，但尖峰泄漏功率插损也随之增大；尖峰脉冲宽度与I层厚度、输入功率及脉冲前沿均有关系。限幅器尖峰泄漏与平顶泄漏模拟结果与实验数据基本一致。     

等压混合引射器设计与实验研究

 采用1维处理方法，建立了便于设计人员使用的等压混合引射器性能计算分析与工程设计方法，并详细分析了等压混合引射器各主要参数对性能的影响。该分析方法基于气体焓的变化，因此可应用于各种引射气体与被引射气体。为了控制尺寸，还首次将多喷嘴引射方式与等压混合结合起来。实验结果验证了等压混合引射器性能计算分析与工程设计方法的可靠性以及多喷嘴引射方式应用于等压混合引射器的可行性。     

Experimental study and numerical simulation of evacuation from a dormitory

The evacuation process of students from a dormitory is investigated by both experiment and modeling. We investigate the video record of pedestrian movement in a dormitory, and find some typical characteristics of evacuation, including continuous pedestrian flow, mass behavior and so on. Based on the experimental observation, we found that simulation results considering pre-movement time are closer to the experimental results. With the model considering pre-movement time, we simulate the evacuation process and compare the simulation results with the experimental results, and find that they agree with each other closely. The crowd massing phenomenon is conducted in this paper. It is found that different crowd massing phenomena will emerge due to different desired velocities. The crowd massing phenomenon could be more serious with the increase of the desired velocity. In this study, we also found the faster-is-slower effect. When the positive effect produced by increasing the desired velocity is not sufficient for making up for its negative effect, the phenomenon of the greater the desired velocity the longer the time required for evacuation will emerge. From the video record, it can be observed that the mass behavior is obvious during the evacuation process. And the mass phenomenon could also be found in simulation. The results obtained from our study are also suitable to all these buildings in which both living and resting areas occupy the majority space, such as dormitories, residential buildings, hotels (restaurants) and so on.     

白僵蚕多糖的甲醇提取与热水提取工艺的比较

建立了白僵蚕多糖的甲醇提取法,采用正交设计,优化了提取工艺,并采用传统的热水提取法验证了新工艺的应用效果。结果表明,甲醇提取法可以有效的应用于白僵蚕多糖的制备。最佳工艺为:浸提温度55℃,浸提时间4h,提取次数2次,料液比1∶40。甲醇提取法提取的多糖得率为11.21%。而热水提取法的多糖得率为10.14%。甲醇提取法的多糖得率优于热水提取法。