The spectrum and the mechanism of the noise inthe refrigerator system are analyzed systematically in thispaper. The spray noise of the capillary outlet is studiedexperimentally and some relevant improved measurementsare presented. The result of the experiment indicates thatthose improved measurements could restrain the spray noiseof the capillary outlet obviously.

The system devised by ourselves is used to detect the Heart Sound(HS) signal. The HS data was sampled at the precardium, and Lead I of the ECG was recorded simultaneously to label the heart sound. Using wavelet transform and timefrequency analysis method, the S3 and S4 of normal children, normal adults, normal elder and old subjects with Coronary Heart Diseases(CHD) were statistically analyzed. The results indicated that all normal persons has S3 and S4, and the significant difference(p=0.0164) was found in main peak frequencies of S3 between normal elder and old group with CHD. It shows that S3 is helpful in diagnosis the cardiovascular diseases.

The article introduced the development and function of image processing system,which uses frozen image trapped, measuring and analytical method, dynamic state microcirculation. It is benefit to the medical teaching mode and also has board application prospect in scientific research.

本文介绍了数字图像处理系统的组成功能及在医学教学、科研中应用.此系统具有静态图像捕捉、测量、分析、动态微循环测量分析、病理报告数据库管理打印、多媒体教学的切片教学和数字录像教学等功能,在医学教学、科研中具有广阔的应用价值.

本文介绍了以传统教学模式为研究对象,用Authorware 4.5进行多媒体程序设计,建立起孕期保健和正常分娩的计算机辅助教学系统;指出通过该系统的学习,可以实现从以教师为中心的教学模式向以学生为中心的教学模式的转变.

目的:建立我国正常人和各类心脏病患者的心音数据库及心音彩色三维图谱库.方法:应用自行研制的心音数据库生成系统采集105例正常人和244例心脏病患者的数据,应用小波变换和自回归模型方法对入库数据进行分析.结果:①成功建立了心音数据库及三维图谱库;②小波变换可成功提取心音不同频段的信息;③彩色三维图谱分析可提取不同心音信号的特征信息.结论:心音数据库及彩色三维图谱库的建立,为自动化心音分析及心音诊断学研究打下了基础.

The wavelet transform analysis method was applied in studying heart sounds of normal and typical heart disease pa-tients.By this method,heart sounds could be studied according to differ ent wavelet analysis scales and time,frequency,ampli-tude.The three-dimensional phonocardiogram after wavelet analyzing could describe all the information of frequency domain,time domain and amplitude domain perfectly.The parameters of time and frequency analysis showed significant different between dif fer-ent groups.As an advantageous and convenient method of heart sounds analysis for clinical diagnosis and assisted instruction of cardiopathy,this study also supplied foundational data for further studying.

目的:通过心音三维分析了解小儿心肌炎的心音特征.方法:对34例健康儿童和26例心肌炎患儿在同一条件下进行心电心音同步采样,将获取的心音信息用计算机三维分析软件从频率、时间、强度三维领域分析研究.结果:心肌炎患儿第二心音(S2)波峰前后60-ms面积与第一心音(S1)面积之比值RTS高于健康儿童,0.05>P>0.01.S2第1谱峰峰值前后5-Hz范围内功率谱曲线所围面积(A1)与0～200-Hz的功率谱曲线所围面积(A2)之比值RF△S低于健康儿童,P<0.001.以频率响应25～200-Hz高频分析收缩期杂音(SM)和舒张期杂音(DM),显示心肌炎患儿SM和DM的RF△S明显高于健康儿童,P≤0.001 .以频率响应0～10-Hz低频分析,其RF△S值低于健康儿童,0.05>P>0.01.结论:心肌炎患儿S1强度明显减弱,S2第1谱峰低频成分减少,SM和DM明显且高频成分增多,SM低频成分减少.

用小波变换时频分析的方法对老年人的第三第四心音进行了分析研究,在心前区采集心音数据,为对心音定位,同步采集了一导心电信号.本研究对30例正常老年人(年龄在50～69岁)和40例冠心病老年人(年龄在53～85岁)的第三第四心音数据进行了统计分析,发现正常老年人S3的频谱主峰频率与冠心病老年人S3的频谱主峰频率有明显的差异.由于S3和S4的幅度和频率都很低,用听诊方法常被漏掉.本研究为心脏疾病的诊断提供了新的途径.