基于DIS的网络化防空作战系统作战效能评估研究

网络化防空是未来防空作战发展的必然趋势，对于网络化防空作战系统的作战效能评估是一个值得研究的问题。在军事仿真领域，分布交互仿真越来越多地应用于作战系统效能的评估与分析。文章在分析分布交互仿真及其在作战效能评估方面的作用的基础上，说明了基于分布交互仿真的网络化防空作战系统作战效能评估的一般步骤，介绍了效能评估仿真系统的体系结构与实现方法，对研究基于攻防对抗仿真的网络化防空作战效能评估具有一定的指导意义。     

数据存储结构与检索效率关系的研究--关于DNA数据存储结构与比对效率

数据库系统区别于其他系统的重要方面之一是DBMS具有有效地处理非常大量数据的能力,但随着数据量的增长,数据的检索速度日益捉襟见肘,如何提高数据的检索效率逐渐受到重视,特别是在一些特殊领域对数据的实时性要求较高的情况下,更需要快速的数据检索.本文正是基于此考虑,以DNA的数据存储为例,针对DNA数据的特点及实际比对的需要,通过具体的数据库实现技术,分析了存储结构对数据库访问速度的影响,在此基础上通过对几个具体方案的实际测试,给出了一个相对较优的数据库存储结构解决方案.     

带传动弹性滑动效率分析

通过对带传动弹性滑动的研究,分别对主动轮和从动轮上的弹性滑动与功率损耗进行了分析研究,建立了弹性滑动与传动功率损耗的数学模型,得出了主、从动轮上囚弹性滑动引起的功率损失的大小以及相互关系,进而推导出了其效率计算公式,揭示了弹性滑动与效率之间的内在关系。     

新型滤波减速器的创新研究

提出一种由偏心减速机构、滤波花键机构及三向止推轴承组成的新型滤波减速器(专利号CN1699793A).介绍该减速器的结构、传动原理及特点,并分析研究滤波花键机构啮合齿轮副,得出滤波花键机构渐开线齿廓不发生干涉、过渡曲线不发生干涉和齿顶圆与齿根圆不发生相碰的条件,计算出该滤波花键机构齿轮副的啮合效率.     

Local collision avoidance of multiple robots using avoidability measure and relative distance

This paper presents a new method driving multiple robots to their goal position without collision. To consider the movement of the robots in a work area, we adopt the concept of avoidability measure. The avoidability measure figures the degree of how easily a robot can avoid other robots considering the velocity of the robots. To implement the concept to avoid collision among multiple robots, relative distance between the robots is proposed. The relative distance is a virtual distance between robots indicating the threat of collision between the robots. Based on the relative distance, the method calculates repulsive force against a robot from the other robots. Also, attractive force toward the goal position is calculated in terms of the relative distance. These repulsive force and attractive force are added to form the driving force for robot motion. The proposed method is simulated for several cases. The results show that the proposed method steers robots to open space anticipating the approach of other robots. In contrast, since the usual potential field method initiates avoidance motion later than the proposed method, it sometimes fails preventing collision or causes hasty motion to avoid other robots. The proposed method works as a local collision-free motion coordination method in conjunction with higher level of task planning and path planning method for multiple robots to do a collaborative job.     

Dynamic modelling of a solar hydrogen system for power and ammonia production

A new configuration of solar energy-driven integrated system for ammonia synthesis and power generation is proposed in this study. A detailed dynamic analysis is conducted on the designed system to investigate its performance under different radiation intensities. The solar heliostat field is integrated to generate steam that is provided to the steam Rankine cycle for power generation. The significant amount of power produced is fed to the PEM electrolyser for hydrogen production after covering the system requirements. A pressure swing adsorption system is integrated with the system that separates nitrogen from the air. The produced hydrogen and nitrogen are employed to the cascaded ammonia production system to establish increased fractional conversions. Numerous parametric studies are conducted to investigate the significant parameters namely; incoming beam irradiance, power production using steam Rankine cycle, hydrogen and ammonia production and power production using TEGs and ORC. The maximum hydrogen and ammonia production flowrates are revealed in June for 17th hour as 5.85 mol/s and 1.38 mol/s and the maximum energetic and exergetic efficiencies are depicted by the month of November as 25.4% and 28.6% respectively. Moreover, the key findings using the comprehensive dynamic analysis are presented and discussed.     

Suppression of efficiency roll-off in TADF-OLEDs using Ag-island nanostructures with localized surface plasmon resonance effect

Organic light-emitting diodes (OLEDs) based on thermally activated delayed fluorescence (TADF) have emerged as promising alternatives to phosphorescent OLEDs for harvesting both singlet and triplet excitons. However, the development of TADF-OLEDs meets a thorny problem of serious efficiency roll-off at high luminance. Here, we demonstrate an approach to suppress the efficiency roll-off characteristics in TADF-OLEDs by localized surface plasmon resonance (LSPR) effect of easy-fabricated Ag-island nanostructures. Compared with the common TADF-OLEDs at a high current density of 100 mA cm⁻², the efficiency roll-off ratio of the TADF-OLEDs with Ag-island nanostructures decreases from 49.75% to 35.76% significantly, and the maximum current efficiency is increased by 10.5%. The performance enhancement is mainly attributed to the coupling between excitons and localized surface plasmons (LSPs), which could alter the excited state kinetic characteristics of TADF molecules.     

基于循证设计理念的医院急诊医学科服务效率研究——以北京朝阳医院为例

循证设计是西方医疗建筑中逐渐兴起的、以实证研究为基础的设计理论和方法,基于循证设计的指导思想将很有可能成为未来医院设计的主体。本文运用循证设计的基本原理和方法,对北京朝阳医院急诊科调研结果进行分析,总结其设计优点与不足,提出影响医院急诊科使用效率的几个方面的内容,期望为医院急诊科设计者提供一些参考。     

Closed loop torque SVM-DTC based on robust super twisting speed controller for induction motor drive with efficiency optimization

This paper presents a space vector modulation (SVM) based Direct Torque Control strategy (DTC) for induction motor (IM) in order to overcome the drawbacks of the classical DTC. SVM can reduce the high torque and flux ripples by preserving a fixed switching frequency. This technique is known by the closed loop torque SVM-DTC. Moreover, the control scheme performance is improved by inserting a second order sliding mode super twisting controller in the outer loop for speed regulation. This nonlinear technique ensures a good dynamic and high robustness against external disturbance. Furthermore, the IM energy optimization is treated in the second objective of this paper. A proposed model based loss minimization strategy is presented for efficiency optimization. This strategy chooses an optimal flux magnitude for each applied load torque. The proposed optimized SVM-DTC algorithm will be investigated by simulation and real time implementation using Matlab/Simulink with real time interface based on dSpace 1104 signal card.     

基于物联网的锅炉能效测试集成系统的研发

基研发了一种基于物联网的锅炉能效测试集成系统。该系统以物联网为网络技术架构、以Zigbee为无线通讯技术，高度集成化测试设备，完全实现了现场测试数据自动采集、无线传输、记录和处理等功能，可现场出具测试报告等功能，可极大地减少测试人员的劳动强度，提高工业锅炉能效测试的科学性和可信度。