On the capacity of packet reservation multiple access with capturein personal communication systems

A new Markovian model is developed to analyze the packet reservation multiple access (PRMA) protocol over Rician fading channels with lognormal shadowing. The packet dropping probability and the voice user capacity are defined as the performance measures. A new formula is derived to evaluate the dropping probability in the fading environment. The analytical results from our new formula show close agreement with those from computer simulations. The capture effect on the PRMA system performance is also studied. We found that, with capture, the user capacity will be improved and the service quality will degrade gracefully when the number of active users in the system increases. Using the dropping probability as the criterion, we also determine the optimal permission probability in a microcellular environment     

智能电视,电话信息查询系统

本文阐述了在ＷＩＮＤＯＷＳ环境下开发电脑，电视、电话信息查询系统系统的基本思想、硬软件环境和具体实施方法，并介绍了软件流程。     

感光乳剂熔化三要素对熔化供料的影响

本文讨论了温度、搅拌和时间三要素对感光乳剂和工艺过程的影响，指出了上述影响的后果和严格过程控制的重要性，提出克服影响的措施。     

准连续Ti~(3+):Al_2O_3可调谐激光的研究

本文给出了Ti~(3+):Al_2O_3的准连续可调谐激光的实验结果。采用Nd:YAG内腔倍频532nm的准连续输出作为泵浦源,得到Ti~(3+):Al_2O_3的连续可调谐输出。波长覆盖范围为685nm到821nm。最大输出功率为293mW,斜率效率为20％,在805nm处的窄谱输出功率达240mW,总体转换效举为26％。     

新疆西达里亚油气藏精细描述研究

从构造、沉积、储层及流体4方面对新疆西达里亚T—Ⅱ油藏进行了精细描述研究。在构造研究中结合地震及测井对比成果进行了重新解释，分析了圈闭特征；在三维地质模型研究中，首先进行沉积微相研究，利用测井解释成果，采用先建砂岩格架后建属性模型的方法，应用地质统计学方法确立了精细的储层参数三维模型，实现油藏三维可视化。     

隔壁精馏塔分离芳烃混合物的模拟研究

采用隔壁精馏塔分离苯-甲苯-对二甲苯物系,用Aspen Plus软件模拟了隔壁精馏塔内温度分布及液相组成分布,考察了汽相和液相分配比对产品纯度的影响。对隔壁精馏塔模拟得到的优化操作条件为:隔壁精馏塔的理论板数为30块,侧线采出在第14块理论板,进料段为15块理论板,在进料段的第7块理论板进料,进料组成n(苯)∶n(甲苯)∶n(对二甲苯)为1∶3∶1,回流比为8.8,液相分配比为2.96,汽相分配比为0.83。在此条件下,各组分的摩尔分数大于98.5%,与实验结果基本吻合。当进料组成n(苯)∶n(甲苯)∶n(对二甲苯)为1∶3∶1时,采用隔壁精馏塔可比常规两塔流程节能27.18%。     

A functional-dependencies-based Bayesian networks learning method and its application in a mobile commerce system.

This paper presents a new method for learning Bayesian networks from functional dependencies (FD) and third normal form (3NF) tables in relational databases. The method sets up a linkage between the theory of relational databases and probabilistic reasoning models, which is interesting and useful especially when data are incomplete and inaccurate. The effectiveness and practicability of the proposed method is demonstrated by its implementation in a mobile commerce system.     

多用途放射性废物焚烧系统工程验证试验

对建立的多用途放射性废物焚烧系统，进行了工程验证试验。试验主要包括固体废物（包括树脂）和废油焚烧及烟气净化时系统的性能测定、非放示踪试验、72h连续运行考验等。经过共计500多小时的试验，验证了工艺流程、主要设备结构、仪表测控及系统安全等设计的可行性和可靠性；系统运行平稳，设备及仪表工作正常。本系统可一炉多用，其处理能力、减容系数、焚烧灰中残炭率以及系统总去污系数等指标，均达到了设计要求。     

全新冷却方式双椭圆泵浦腔的实验研究

报导一种全新冷却方式的双椭圆泵浦腔，具有较高的泵浦效率和光学均匀性。１．０６μｍ调Ｑ脉冲输出能量总转换效率η＞０．７５％