电耳——聋人学语器

<正> 电耳就是让聋人用眼看屏幕上声波的图像,从图像了解声音的内容,便等于有了听觉。有了听觉,聋人便可以学习说话。所以电耳的使用效果,不仅是治聋,而在于治哑。 一般电耳能把完整的声波变成图像,显示在屏幕上。聋人只要看着标准图像说话,当发出的声波图像与标准图像基本一致时,即学会了说话,由于声波图像容易识别,容易模仿。所以大大有利于聋人听话及学习说话的能力。 众所周知,图像所载信息远比声音所载的多。从这一点来说,用电耳听声音(目前仅限于语言,不包括所有声音)比助听器听起来更清楚。聋人发的音也将更清晰。 还有电耳是把声波真实地显示在屏幕上,并没有加入汉语的风格。所以它适用于学习各国语言,也适用于学习各地     

有机反应的微环境效应—手性胶束中的交叉Aldol反应

有机反应的微环境效应——手性胶束中的交叉Ａｌｄｏｌ反应张永敏孙培培（杭州大学化学系３１００２８）微环境效应在有机反应中起着重要作用，如手性胶束体系能为反应提供一个立体规整性的微环境［１］。利用胶束及类似聚集体和受物形成的超分子体系进行不对称反应近年来...     

GENERALIZED GREEN''''S FUNCTIONS OF SURFACE EXCITATION OF ELASTIC WAVE FIELDS IN A PIEZOELECTRIC HALF-SPACE

Since the generalized Green's functions,which correspond to surface excitation of elastic wavefields in a half-space of piezoelectric crystal,are independent of excitation conditions and only depen-dent on material parameters and orientation,they can be investigated in advance and independently. It is shown that the generalized Green's functions can be written as a sum of three parts repre-senting separately a surface wave,a bulk wave and an electrostatic effect. We also confirm that the surface wave part and the bulk wave part at the far field of the generalizedGreen's functions can be expressed by analytical expressions,and thus,the surface wave field and thefar field of bulk wave among the excited elastic wave fields can be evaluated exactly. Finally,as an example,the generalized Green's functions for the 6 mm crystal are given.     

脾气虚证大白鼠肌肉线粒体图像分析比较研究

脾气虚证大白鼠肌肉线粒体图像分析比较研究柳和培侯燕鸣（中国中医研究院基础理论研究所，北京１００７００）电子显微术和超微结构定量计测应用于中医基础理论研究，对股四头肌单位视野的线粒体数进行了测定和分析，结果显示脾气虚证大白鼠结构正常的线粒体数显著减少，...     

CRYSTAL STRUCTURE DETERMINATION OF MUNG BEAN TRYPSIN INHIBITOR Lys FRAGMENT-BOVINE TRYPSIN COMPLEX——MOLECULAR REPLACEMENT,ELECTRON DENSITY MAP AT 3.0 ■ RESOLUTION

The orientation and position of the trypsin molecule in the complex crystal cell mung bean trypsin inhibitor Lys fragment (MBILF)-bovine trypsin (BTRY) have been successfully determined by molecular replacement method with the model of the refined bovine trypsin molecule.Starting from the BTRY coordinates which were oriented and located in the correct azimuth and position in the complex cell according to the result from rotation function and translation function, sim-weighted Fourier map with coefficients 2|F_o|-|F_c| at 3.0 resolution was calculated.Besides the electron density which is obviously attributed to itself, in the vicinity of the active site of BTRY the dense contour levels corresponding to the MBILF and its boundary could be clearly seen in this map. The size of MBILF was approximately estimated at 15×15×25.     

读了“我怎样加强有机化学教学的思想性”后

我们以极大的兴趣阅读了化学通报1955年7月号42页陈国钦同志所写“我怎样加强有机化学教学的思想性”一文,因为这是当前中学教学中非常重要的问题。读了该文以后,我同意陈同志所提两点:“(1)从认识的过程来培养学生的辩证唯物主义的思想方法;(2)从具体事例培养学生的辩证唯物主义世界观”(当然加强有机化学教学的思想性不限于陈同志所提两点)。不过我们对陈同志在教学中为加强教学的思想性所采用的教材有下列意见:     

Eu(Ⅲ)离子光谱探针配合物Eu(DMBM)(TPPO)_2(NO_3)_2中Eu(Ⅲ)的格位

77K下测得的激光激发光谱和发光光谱表明,配合物Eu(DMBM)(TPPO)_2(NO_3)_2(DMBM:二对甲氧基苯甲酰甲烷;TPPO:三苯基氧化膦)中的Eu(Ⅲ)离子具有两种晶格格位。~5D_0→~7F_I(0～2)跃迁光谱说明这两种铕(Ⅲ)格位的点群对称性分别是C_(2v)和C_1(或C_2或C_5)。有较高对称性(C_(2v))的格位在配合物中占优势。     

用椭偏光谱法测量很薄固体膜的光性

本文讨论了利用棉偏光谱法测量很薄固体膜的光性的原理和方法,包括椭偏计算模型的建立、模型的合适性等问题,考察了环境介质-薄膜-衬底三根系统和环境介质-薄膜-界面过渡层-衬底四相系统,并引入了一种简化椭偏计算的方法。此外,本文也给出了两个研究实例,包括Si衬底上的Pt膜和PtSi膜。