水轮机组最优同期控制研究及电站应用

本文论述了基于二次性能指标的水轮机组快速自动准同期最优控制器的设计条件及方法,探讨了最优同期控制器与频率相角复合同期控制器参数之间的关系.文中给出了实验室内动态实时仿真及水电厂运行结果.结果表明最优同期控制器可使机组启动后快速进入同期点,提供每分钟6～9次的并网机会.     

对溴苯甲醚合成条件的改进

探讨反应条件、试剂用量以及改进的两条合成路线对合成对溴苯甲醚产率的影响。经改进的合成方法反应条件从１４０℃～１５０℃降至７０℃～８０℃,操作简便,产率从６０％提高到８２％～８７．４％。     

冷冻干燥瓶装物料的二维模型研究

瓶装物料的冷冻干燥是现今冷冻干燥生产的主要形式之一。基于目前对瓶侧面传热的二维冷冻干燥理论的研究还不成熟,本文提出了一个考虑因素较为全面的二维数学模型。根据模型方程的特点把二循环对称分裂格式、预测-校正格式等算法联立起来对模型进行了数值求解。结果表明,计算值与以脱脂牛奶为物料冷冻干燥实验结果吻合良好。     

三种铁基合金在浓碱溶液中的电化学行为

测定了石墨和三种铁基合金在浓NaOH溶液中的极化曲线,发现三种铁基合金在浓碱中的电化学行为有较大差异,用理论电位-pH图对造成这一差异的原因作了解释,同时讨论了浓碱腐蚀的阴极去极化过程,分析了高温下合金腐蚀速度增大的原因。     

Realization and application of RSA in chip operating system

As an outstanding asymmetric cryptography, RSA algorithm has a lot of virtues and thus is well applied in the scope of IC card applications. The paper deals with the application of RSA in smart cards and the approach in which the modular exponentiation of huge number is simplified by using the Chinese Remainder Theorem. We have already succeeded in completing RSA in IC cards. Results indicate that RSA algorithm applied in IC cards has the equivalent speed of DES algorithm with the same environment.     

Cloning and identification of a novel human glioma differentiation related geneGDR1

In order to identify the genes associated with glioblastoma differentiation, some ESTs, expressed differentially in the control cell and the differentiated human glioblastoma cell line BT-325 induced by the all-trans retinoid acid, have been isolated by the method of DDRT-PCR. Of the 46 ESTs sequenced, 19 are from new genes. A full-length 1 535-bp cDNA, termed geneGDR1, has been isolated from the human cDNA library using the probe designed according to one of the novel ESTs, HGBB098. The open reading frame ofGDR1 gene encodes a putative protein containing 334 amino acid residues. Blast against the current GenBank DNA and protein sequence database did not reveal significant homology with any known proteins. RT-PCR shows thatGDR1 mRNA level increased in the differentiated BT-325 cells after being treated with RA. The different expression patterns ofGDR1 mRNA in human tissues have been detected through the multiple tissue Northern blot hybridization.     

考虑消费者策略行为的产品服务供应链动态定价与协调

针对一个制造商和一个服务集成商组成的产品服务供应链,考虑消费者向服务集成商购买产品服务系统时存在策略性等待行为,通过构建两个销售阶段的动态博弈模型,分析了产品服务系统价值、成本和服务价值占比等因素对消费者策略行为和均衡结果的影响,比较了分散式与集中式决策的绩效偏差,基于两阶段收益共享契约实现了供应链协调.研究表明:提高产品服务系统价值、服务价值占比能减少消费者策略行为,提高供应链及其成员的总利润;高产品服务系统价值、高服务价值占比虽能增加分散式决策下的系统利润,但也扩大了与集中式决策下的系统利润差距;收益共享契约能调整消费者的策略行为,即当服务价值占比较高时,可以通过价格调整来抑制消费者的策略行为实现供应链协调.     

未来无线移动通信前瞻

随着移动通信技术的发展,世界正在变的越来越小,信息的交流也变的更为顺畅,同时人们对无线移动通信的要求也越来越高。目前4G技术已逐步在世界范围内开始部署,这也激励了科技工作者们继续探索未来无线移动通信的技术。未来无线通信的发展必将面临着非常高的移动终端密度和如何提高频谱利用率等一系列问题,如何克服这些问题,将会是未来移动通信的重点。要解决上述问题,文章尝试着从以下几种相互关联的技术中给出答案：小基站技术、设备与设备互联技术、云端无线接入网络技术和无线网络最优接入技术。