基于USB接口的高速数据采集卡的设计

通用串行总线作为一种崭新的微机总线接口规范,其特点使其非常适合高速数据采集系统.文中介绍了一种基于USB接口的数据采集板卡的设计,包括硬件设计、固件设计、基于WINDOWS驱动程序模型(WDM)的设备驱动程序设计以及应用软件的设计.经试验证明该系统达到了预期的目的.     

自动微波测量系统的设计与实现

根据常规手动测量系统的测量原理,对以微波开槽测量线为主体的测量系统进行自动化设计,形成了集测量线自动运行、数据自动采集与处理、结果显示与输出等多种功能于一体的自动微波测量系统。实际运行表明,该系统具有测量原理清晰、测量过程直观形象、测量速度快、精度较高等特点。     

分布式数据库数据复制技术的分析与应用

本文在分布式数据库系统的基础上，针对分布式数据库的数据存储方式进行了概述，细致地讲述了分布式数据库复制技术的几个关键内容，对Oracle、Sybase、SQL Server数据库的复制技术(方案)进行了综合分析比较，并结合实践经验提出了复制技术的方案选择策略，对复制技术的发展进行了展望。     

基于组件的报表公式数据处理的设计与实现

用手工进行报表数据处理，已经越来越不适应现代社会的要求，本文提出了一种结合Delphi组件FlBook，在电子报表中自定义公式进行数据处理的实现方法，给出了采用面向对象编程的表达式解释实现技术。     

改变支承条件对无梁板结构内力的影响

通过模拟计算与分析，提出了种无梁板支承条件的调整方式，并对调整后结构的内力影响问题进行讨论。     

Evaluation of the in vitro and in vivo performance of two sustained-release lithium carbonate matrix tablets. Effect of different diets on the bioavailability

Two sustained-release (SR) lithium carbonate (Li) matrix tablets, which use a hydrophilic (HP) matrix of hydroxypropylmethylcellulose (Methocel 4K MP) and a lipid (L) matrix of hydrogenated castor oil (Cutina HR) as sustaining agents, have been studied. In vitro performance through dissolution tests in different media was established. The L and HP formulations were affected by the composition of the dissolution media, and liberation was complete in 8 hr using a variable-pH medium that simulates the gastrointestinal (Gl) pH. Liberation was better described by the diffusional model of the square root of time for the L matrix and by zero-order kinetics for the HP matrix. Absolute bioavailability (BA) and food-induced changes on BA of both formulations were studied. The in vivo study design was a 4 x 4 Latin square involving 12 subjects who received two tablets of a 300-mg dose of SR formulations while fasting or with a standardized normal, high-fat, or high-fat/high-protein meal. The results for both formulations showed no differences in the disposition parameters and mean residence time when the tablets were administered with any type of diet. Changes in rate of absorption were found when both types of tablets were administered with any class of diet. The analysis of the ratio Cmax/AUC (area under the curve) evidenced that changes in Cmax were attributable to a higher rate of absorption for the HP matrix and to a higher amount absorbed for the L matrix. In the last, high-fat and high-fat/high-protein diets produced higher AUCs than under fasting condition. The SR Li tablets formulated with hydrogenated castor oil were affected more by high-fat food, probably because of the increase of pancreatic and biliary secretions promoted by the meal, which would affect the matrix itself. The HP matrix was also affected, but to a lesser extent. The magnitude of the change in Cmax observed with this matrix probably is not important from a clinical point of view. Absolute BA was very low for the lipid matrix; in addition, since it is more seriously affected by food, probably it is not a good choice for a drug such as lithium. The in vivo behavior of the HP matrix makes it advisable to invest in efforts to achieve increased BA. Comparing in vitro and in vivo results, the focus should be achieving sustained, but complete, in vitro liberation in not more than 3 hr, with simulation of the transit time through the stomach and small bowel since lithium ion is only absorbed to this point.     

影响热释光剂量计定度系数的因素

介绍了ＴＬＤ定度系数的三种影响因素,并指出剂量传递法定度ＴＬＤ的定度系数,可以使ＴＬＤ测量剂量的相对误差控制在±５％。     

广东大亚湾核电站环境辐射热释光累积剂量监测研究

介绍了利用热释光测量技术对自１９９４年投入商业运行的广东大亚湾核电站周围５０ｋｍ范围的环境γ辐射进行了常规监测。４年来的监测结果表明,核电站周围５０ｋｍ范围内的总体环境γ辐射水平没有发现明显的改变。但在告近核电站１ｋｍ范围内的监测点上,１９９５年监测到来自核电站排放的气载放射性流出物的影响。     

玻璃纤维增强MC尼龙复合材料的力学性能

考察了玻璃纤维增强ＭＣ尼龙（ＧＦＲＭＣＮ）中玻璃纤维的表面处理及加入量对力学性能的影响。并用ＳＥＭ对ＧＦＲＭＣＮ材料界面及其对力学性能的影响进行了研究。结果表明：使用ＫＨ５５０作偶联剂对ＧＦＲＭＣＮ复合材料是很有效的。当玻纤加入４０％时,拉伸强度比基体提高３２．２％,拉伸弹性模量提高了１５２％,弯曲强度提高７４．３％,弯曲弹性模量提高了１１７％,而缺口冲击韧性提高了１６２％。根据材料的制备工艺特点