稀土改性固体超强酸SO42-/TiO2-MoO3-La2O3催化合成环己酮1,2-丙二醇缩酮

报道了以稀土改性固体超强酸SO42-/TiO2-MoO3-La2O3为多相催化剂,通过环己酮和1,2-丙二醇反应合成了环己酮1,2-丙二醇缩酮,探讨了SO42-/TiO2-MoO3-La2O3对缩酮反应的催化活性,采用正交试验法系统地研究了酮醇量比,催化剂用量,反应时间诸因素对产品收率的影响。实验表明,稀土改性固体超强酸SO42-/TiO2-MoO3-La2O3是合成环己酮1,2-丙二醇缩酮的良好催化剂,在n(环己酮)∶n(1,2-丙二醇)=1∶1.6,催化剂用量为反应物料总质量的0.4%,环己烷为带水剂,反应时间1.0 h的优化条件下,环己酮1,2-丙二醇缩酮的收率可达88.8%。     

2024铝合金气滑铸造工艺研究

介绍2024铝合金及其气滑铸造特点，研究熔体净化、铸造速度、冷却强度、空气压力、润滑油供给量等参数对熔铸工艺及铸锭表面质量的影响，确定2024铝合金气滑铸造工艺参数。     

BPEL中基于有限状态自动机的Web服务自动组合

提出了一种基于有限状态自动机的Web服务自动组合方法,该方法能够自动实现BPEL中抽象业务流程与Web服务的绑定.以有限状态自动机模型形式化地定义了业务流程的外模式和内模式,将Web服务组合问题转化为有限状态自动机问题.利用有限状态自动机的笛卡儿积运算,得出了服务组合系统的行为描述.在此基础上,提出了组合服务存在性的判定依据,进一步给出了组合服务的计算方法,设计并实现了一个演示系统.     

IP over WDM网络中一种新型虚拓扑构造算法

对IP over WDM的虚拓扑设计算法进行了研究，选择网络整体流量的均衡性作为优化目标，提出了一种新型的虚拓扑构造算法。在算法中，选择负载分布方差作为评价流量均衡性的指标，并给出其定义和计算方法。主要针对拥塞概率性能，在光层和IP层将提出的新型虚拓扑构造算法与其他算法进行比较。在光层的算法比较部分，选择负载均衡启发式路由算法（RLBH，routing with load balancing heuristics）与提出的算法进行比较；在IP层的算法比较部分，选择固定路径最小拥塞路由算法（FPLC，fixed-path least-congestion）与提出的算法进行比较，并对比较结果进行了讨论。比较结果显示在拥塞概率性能方面，提出的新型虚拓扑构造算法优于RLBH算法和FPLC算法。     

用于配电网开关优化配置问题的二进制PSO算法

提出了1种求解配电网开关优化配置问题的二进制粒子群(PSO)算法。该算法通过对开关设备总投资、年运行费用和年停电损失费用等优化计算,以达到综合年费最少的角度,确定了1种开关配置方案。仿真计算表明,二进制PSO算法相对于遗传算法和免疫算法等搜索方法而言,具有更好的全局收敛性,且算法简单,是求解配电网开关优化配置问题一种有效方法。     

有源阵列天线的发展及应用

介绍了有源阵列天线的发展概况、组成结构及技术特点,并对比其与无源阵列天线的优缺点,讨论了有源阵列天线的应用及发展前景。     

Ubiquitous robotics: Recent challenges and future trends

Ambient intelligence, ubiquitous and networked robots, and cloud robotics are new research hot topics that have started to gain popularity among the robotics community. They enable robots to acquire richer functionalities and open the way for the composition of a variety of robotic services with three functions: semantic perception, reasoning and actuation. Ubiquitous robots (ubirobots) overcome the limitations of stand-alone robots by integrating them with web services and ambient intelligence technologies. The overlap that exists now between ubirobots and ambient intelligence makes their integration worthwhile. It targets to create a hybrid physical–digital space rich with a myriad of proactive intelligent services that enhance the quality and the way of our living and working. Furthermore, the emergence of cloud computing initiates the massive use of a new generation of ubirobots that enrich their cognitive capabilities and share their knowledge by connecting themselves to cloud infrastructures. The future of ubirobots will certainly be open to an unlimited space of applications such as physical and virtual companions assisting people in their daily living, ubirobots that are able to co-work alongside people and cooperate with them in the same environment, and physical and virtual autonomic guards that are able to protect people, monitor their security and safety, and rescue them in indoor and outdoor spaces. This paper introduces the recent challenges and future trends on these topics.     

Remote sensing applications in the Australian Bureau of Meteorology

Abstract

The space age for the Bureau of Meteorology arrived in December 1963 with the first direct receipt in Australia of visual images of clouds from the US TIROS-8 satellite. Since that time, the successful application of advances in satellite data, products and services has brought dramatic improvements to most aspects of the Bureau's operations and research. This paper documents the developments of the past 25 years by describing the Bureau's current national infrastructure for the reception, processing and dissemination of meteorological satellite data and the way in which satellite data and systems are used to improve the Bureau's services. The meteorological satellite has emerged not only as a highly cost-effective primary observation platform, providing an increasingly diverse range of meteorological data, but also as a vital communications medium for both general meteorological information and the interrogation of complementary observational systems. The prospects for further major advances in the application of satellite information within the Bureau are very high. During the early 1990s and beyond, the next generation of active remote sensing technology will replace the current passive sensor technology deployed in the international meteorological satellite network. As a result, further improvement in the ability of the Australian meteorological community to describe quantitatively the dynamic and thermodynamic structure of the atmospheric and marine environment is confidently predicted.     

GENERALIZED PREDICTIVE CONTROL OF A PULSED LIQUID-LIQUID EXTRACTION COLUMN

This paper deals with the application of a general predictive controller to a pulsed liquid-liquid extraction column. The control purpose is to maintain the column in its optimal behaviour zone in spite or flowrates and physical properties of solvent and solute fluctuations. The complex dynamics of the column is modeled by a low order linear discrete model with time varying parameters which are recursively identified. Based on these estimates, the control policy is adapted on line.

The obtained results illustrate the successful application of such an adaptive algorithm.