Performance analysis of rake-MBER-equalizer for DS-UWB communication systems

A joint rake and minimum bit-error rate (MBER) equalizer receiver for direct-sequence ultra-wideband (DS-UWB) communication systems is proposed, where the receiver combats against inter-symbol interference (ISI) by utilizing the rake and equalization techniques. Theoretical analysis and simulation results of the proposed receiver performance are given. Monte Carlo simulations show that the performance of this receiver outperforms rake-MMSE-equalizer receiver and it will degrade with the increase of data speed and the decrease of rake fingers.     

虚拟光栅的可视化生成软件设计

基于结构光照明的主动三维测量技术由于具有快速、非接触、高精度、易于实现自动化等测量特点,日益受到人们的重视。文中依据正弦光栅、Ronchi光栅的物理模型,在计算机可视化软件平台上实现对光栅的图像仿真及功能变换,包括光栅类型的选择、光栅密度的设定、对比度的设定、占空比的设定、红绿双频显示、相位移动、正交光栅、混合光栅的生成以及在光栅上添加标记。该软件交互性强,结果直观,操作简单,可应用于日常教学及三维测量技术中虚拟光栅的生成,从而取代实际光栅的使用不便。     

基于移动代理和信任机制的网格作业管理

介绍了网络计算环境下的作业管理,引入了移动代理技术和信任机制,并进行了深入分析,对所用到的关键技术进行了详细的解释,说明了基于移动代理和信任机制的网格作业管理运行步骤.     

栲胶-硫酸锰体系的脱硫研究

以氧化栲胶(Teos)-MnSO4为脱硫剂,采用氧化-还原电位方法进行脱除硫化氢的研究,考察了该体系用于脱硫的热力学可行性、MnSO4对氧化再生性能、脱硫液电位和脱硫过程的影响。结果表明:Teos-MnSO4碱性溶液脱硫在热力学上是可行的;影响脱硫液贫液电位的主要因素是Teos,随Teos浓度1 g/L～3 g/L增加而降低;MnSO4 0.025g/L无需另加入络合剂能稳定存在,模拟氧化再生过程实验表明锰盐能改善栲胶脱硫液的氧化再生性能,络合剂柠檬酸0.25 g/L的加入对此影响不明显;模拟脱硫过程实验表明脱硫液电位与所含H2S浓度的对数成线性关系,而脱硫液硫容较低,欲提高其硫容须添加其它变价金属组份。     

反胶束萃取技术制备大豆蛋白组分的电泳法研究

对不同条件下丁二酸二异辛酯磺酸钠(AOT)/异辛烷反胶束溶液萃取的大豆蛋白进行电泳分析,同时考察反胶束萃取与碱溶酸沉法生产大豆蛋白产品组分的差异.蛋白产品组分分析表明,随着反胶团"水池"半径的减小,反胶束能萃取较大的大豆蛋白质亚基的比例有明显的减小;大豆分离蛋白与反胶束萃取的大豆蛋白所含的亚基比例有明显的差别.     

鸸鹋蛋壳粉对应激小鼠性功能和幼龄小鼠精子活性的影响

目的:观察国产鸸鹋蛋壳粉对应激小鼠性功能及幼龄小鼠精子活性的影响.方法:以重复电刺激复制应激小鼠性行为障碍模型,观察雄性小鼠的交配能力.给正常幼龄雄性小鼠连续服药21d后检测其精子密度和精子活动率.结果:鸸鹋蛋壳粉对电刺激应激诱发的雄性小鼠性功能障碍有促进恢复作用,能增加交配次数,缩短交配潜伏时间,并能提高未成年雄性小鼠的精子活动率.结论:国产鸸鹋蛋壳粉具有增强雄性小鼠性功能,提高小鼠精子活性的作用.     

影响猪蹄姜醋罐头钙含量的主要因素

采用不同的杀菌条件及配方制作猪蹄姜醋罐头,用原子吸收分光光度法分析样品中可食部分钙含量,并与时照样对比,结果表明:猪蹄姜醋罐头采用低温长时杀菌比高温短时杀菌更越有利于钙的溶出;配方中使用的甜米醋有利于钙的溶出;猪蹄姜醋罐头含有丰富的钙质,是膳食钙的良好来源.     

Use of prostaglandin F2 alpha or gonadotropin releasing hormone in treating problem breeding cows

Ten veterinarians diagnosed and treated 296 cows for reproductive irregularities on 28 dairy farms. Average interval from treatment with 25 mg of prostaglandin F2 alpha (137 cows) to estrus for cows with a corpus luteum (14.6 days) was reduced compared to saline (52 cows) (21.8 days), and a greater percentage (41.6 versus 17.3%) showed estrus within 6 days of treatment. Cows with a cystic corpus luteum (28) were detected in estrus at comparable intervals after prostaglandin F2 alpha or saline (21.8 versus 21.2 days), and similar proportions of cows were detected in estrus within 6 days of treatment (16.7 versus 10.0%). Intervals to estrus among cows with cystic follicles (40 cows) or anestrous cows with follicular ovaries (39 cows) did not differ after treatment with saline or 100 or 200 micrograms of gonadotropin releasing hormone. Within 25 days after treatment, 47.5% of cows with cystic ovaries and 64.1% of anestrous cows showed estrus. Number of cows pregnant after as many as three artificial inseminations of the number examined was 46%, whereas average number of conceptions per service was .32. The long interval from parturition to examination (112 days), the low rate of estrous response after treatment, and the long interval (1.6 estrous cycles) between estruses are consonant with inadequate estrous detection.     

河北省居民乳制品消费研究

通过对河北省居民乳制品消费量、消费品种、消费群体和消费地域的现状分析,提出了对策和建议。期望能对河北省乳制品消费趋势以及奶牛养殖规划和乳品行业发展规划的制定起到一定的借鉴作用。     

关于白砂糖电导灰分偏高的原因分析

分析灰分超标白砂糖灰分成份,并通过试验室模拟试验与分析主要灰分成份在澄清过程变化,探讨白砂糖灰分超标的主要原因,为糖厂降低白砂糖灰分提供理论依据。