听觉诱发电位与声舒适度的关联性初探

为了研究声舒适度与听觉诱发电位的关系,使用诱发电位仪记录了不同频率和不同声压级刺激下的听觉诱发电位。结果表明：随着声音频率的提高,诱发电位的波峰越密集,这与声音本身的频率特性相匹配;随着声压级的增大,诱发电位幅值增大,这解释了人体主观烦恼度随着声压级增大而增加的现象。在不同频率和不同声压级刺激下,Ⅴ波较其他波形稳定,说明人体脑桥上段或中脑下端对声音特性更敏感。该研究可为不同声环境下人体声舒适度机理研究做参考。     

Effect of cold exposure on electrophysiological properties of rat heart

Male rats exposed to the cold (4°C) for five or ten days exhibited modifications in their thyroid state, as documented by increases in serum thyroid hormone levels, to which differently graded modifications of heart weight/body weight ratio, heart rate, and resting metabolic rate were associated. The values of the above mentioned thyroid state indicators returned to those of the control when the animals, kept at cold for ten days, were re-exposed to room temperature (24°C) for an additional 10 days. The configuration of action potentials, recorded in vitro at 26°C from fibres of anterior papillary muscles, was different in control rats of different age and was affected by prolonged cold exposure. In fact, the action potential duration (APD) increased after ten days of cold exposure. In the re-exposed group the APD was not different from that of the controls. Such a pattern was not significantly modified when the stimulation frequency increased from 1 Hz to 5 Hz. The above results suggest that in cold exposure, as in experimental hyperthyroidism, thyroid hormone might exert a cardiac chronotropic effect by modifying heart electrophysiological properties. Thus thyroid hormone should play a basic role during the exposure to cold environment, stimulating the body metabolism and increasing heart rate as a response to the requirement for greater tissue perfusion.     

Effect of primary phase structure on the undercoolability of quasicrystal-forming melt

The relationship between α and Δ T rel is investigated, where α is a factor that depends on the structure of primary phase and Δ T rel , the relative undercooling of melt. A linear relationship between α and the relative undercooling Δ T rel is observed, which is represented by Δ T rel ＝ A+Bα.     

关于视觉诱发电位提取方法的探讨

介绍了几种视觉诱发电位的处理方法，包括各种方法的原理，工作过程，并比较各自的优劣     

核酸碱基分子静电势梯度图

本文导出了计算分子周转空间电势梯度的计算公式，并运用我们所建议的等梯度线图方法研究了五种碱基Ａ，Ｔ，Ｕ，Ｇ，Ｃ周转的电场，讨论了图形所提供的物理，化学和生物学意义。     

基于ICA的消除ERP中伪迹干扰的方法

概述了消除事件相关脑电位(ERP)伪迹的一般方法和存在的问题，介绍了独立分量分析(ICA)的基本原理及其两个关键内容，将ICA算法用于消除ERP伪迹干扰，根据ERP伪迹的特点用ICA算法编写了一组用于盲信号分离和伪迹干扰消除的程序，利用该组程序，进行了仿真实验和消除ERP实测数据中伪迹干扰的处理实验，仿真实验完全分离出了4组人为随机混合的信号，实测信号实验较好地消除了伪迹干扰的影响，实验结果表明，使用ICA算法消除ERP伪迹干扰是一种较理想的方法。     

两参数马尔可夫过程及位势的性质

研究了两参数马尔可夫过程及位势中的一些问题，得到了两参数位势的预解方程式及Ｄｙｎｋｉｎ公式．     

取代马来酸酐的电子亲合能

分别以取代马来酸酐与苯酚钾及对位取代苯酚钾互相作用的电荷转移光谱和取代马来酸酐的半波还原电位，测定了２－氯马来酸酐，２－溴马来酸酐，２－甲基马来酸酐，２，３－二甲基马来酸酐，四氢化邻苯二甲酸酐和１，８－萘二酸酐的电子亲合能，发现以电荷转移光谱测定的电子亲合能数值比使用半波还原电位方法得到的数值大小。     

利用伪随机序列相关辨识检测视觉诱发电位

诱发电位在临床诊断及中枢神经系统的研究中有重要意义。目前的诱发电位检测方法是平均法，由平均法获得的诱发电位远不能满足许多实际应用的需要。本文利用伪随机序列相关辨识技术，实现了快速检测视觉诱发电位。文中对这项技术的原理作了详细的描述，给出了检测算法，并分析了检测信噪比相对平均法的改善情况。实验结果显示，这项技术能大大缩短检测时间，对克服时变因素的影响，减少病人的痛苦，以及对诱发电位在神经外科手术中的应用都有深远意义。     

活塞式压力传感器的研制

骨受应力作用变形后在骨内产生电位的性质，称为骨的力电性质。活塞式压力传感器的研制是湿骨内动态力电性质的实验研究的重要课题之一。活塞式压力传感器在骨的力电性质研究中既是施力装置又是测力装置，是圆满完成整个实验的关键部件。本文较详细地介绍了活塞式压力传感器的研制原理，力与应变关系的推导过程以及应变片粘贴及固化工艺。