松花粉破壁方法的比较研究

以松花粉为主要原料,分别采用纤维素酶法、超声波法、发酵法和旋风破碎法对松花粉进行了破壁研究,并从不同角度对几种方法进行了比较。     

Temporal-spatial Filtering in the Preprocessing of Clinical EEG Signals

EEG spot-recording for clinical patients in the bed is always advocated due to easing patients and making them comfortable. But EEG signals recorded in the ward exposed to various noisesand interference is less effective in the EEG analysis. Atemporal-spatial filter is designed for noise removing of clinical EEG signals, the first filtering is temporal filtering using band-pass filter, and the second filtering is spatial filtering with ICA-based spatial filter. Experimental results indicate that various noises and interferences, such as power interference, blinking, eyes movements, muscle moments, ECG artifacts, etc., are removed effectively, individually or simultaneously.     

基于单台强震数据软厚场地地震反应不确定性分析

选取新西兰Canterbury地区12个强震台站及2010—2012年间的台站584条记录,以浅硬场地LPCC作为参考台站,系统分析Christchurch市区软厚场地地震效应(即场地放大函数)的不确定性及地震动强度、震级、震源距及震源方位角等因素对场地放大函数不确定性的影响规律。分析结果发现：1)地震动强度水平对场地放大函数均值影响较小,仅在长周期(如大于1.0 s)段趋于增大场地的放大效应;以不同地震动强度值进行分组,地震动强度大于0.6 m/s 2的分组场地放大函数标准差显著高于地震动强度小于0.6 m/s 2分组,特别是地震动强度大于1.0 m/s 2时场地放大函数标准差最大,反映了场地土层非线性提高场地地震效应的不确定性;2)地震震级对场地放大函数不确定性影响小,不同地震震级分组场地放大函数均值及标准差的表现基本相当;3)震源距是场地地震反应不确定性的一个重要因素,震源距小于5 km时场地放大函数的标准差明显大于其它情况,即震源距越小地震反应不确定性越大;4)场地放大函数不确定性与震源方位角的选取基本无关,即选取不同的震源方位角场地放大函数标准差无明显差别。     

Synthetic Assessment of Power Transformer Condition Based on Matter-element Theory

Condition assessment on power transformer is an important approach to improve reliability of transformer and provide proper decision-making for condition-based maintenance. For long, static assessment method used in the past has already not adapted to the development of modem electricity transmission and distribution technology. So based on the deficiency of fuzzy synthetic assessment method, matter-element synthetic assessment method is introduced. The method can evaluate transformer condition not only in quality but also in quantity. Because each index weight can be given fairly and fast through improved analytic hierarchy process, which need not carry on consistency chec accuracy of assessment can be improved. Examples analysis has proved that assessment method of power transformer condition based on matter-element theory is rational and effective.     

Influence of MUD on the System Capability of CDMA

In CDMA communication system, the relativities between users result in Multiple Access Interference (MAI). With the increase of users, MAI becomes the main jam of broadband CDMA communication system. Multi-User Detection (MUD) is the most important technology of anti-jamming in the broadband CDMA communication system, which can eliminates MAI effectively by using the information of all user signals to detection single. This paper analyze the expression of system capability without MUD and with MUD, and puts forward the way to increase system capability by using MUD. Then the influence of MUD on CDMA system capability is discussed by MATLAB emulation. Basing analysis and emulation, the conclusion is got: the higher the MUD efficiency, the better the improvement of CDMA system capability; under the same MUD efficiency, the lower data rate, the smaller inter-cell interference, the lower the ratio of bit energy to power spectrum, the better the improvement of CDMA system capability.     

Principle and Key Technology of Full Automatic Vicat Apparatus

In this paper the working principle and performance character of both the manual and automatic Vicat apparatuses in existence are compared and analyzed,and their existing weakness and the urgent problem to be solved are pointed out.On this basis,adopting the technology of mechatronics and modern sensors,a new sort of full automatic Vicat apparatus that can fully satisfy the national standard in testing the setting time of the cement has been developed.This apparatus can be operated expediently with high precision,the test results are to be analyzed and computed automatically.This paper presents the working principle,performance character,key technology and prospect of application for the full automatic Vicat apparatus.     

五个鲜食玉米新品种的DNA指纹图谱研究与应用

利用SSR标记技术，对5个鲜食玉米新品种及其亲本的DNA指纹图谱进行了研究。从88对SSR引物中，筛选出37对在鲜食玉米中表现多态性丰富、带型清晰明显且稳定的引物，分析了鲜食玉米自交系的遗传多样性，建立了各品种的特征DNA指纹图谱及数字指纹，可以有效用于种子质量检测。