综合医院洁净手术部电气设计要点剖析

结合三级医院洁净手术部的设计实践,重点从供电电源、供电方案、配电设计、照明设计、安全接地、电气用房设计等方面,剖析洁净手术部的电气设计要点,为满足医院常态化疫情防控提供技术保障.     

基于GNSS的广电发射塔状态监测技术研究

随着全球卫星导航系统(Global Navigation Satellite System,GNSS)技术的迅速发展,定位精度持续优化,其应用范围越来越广.为了突破单基站载波相位差分(Real Time Kinematic,RTK)技术带来的局限性,网络RTK技术应运而生.网络RTK技术使设备在基准站网络覆盖范围内实现精准定位,因此在各个传统行业中的应用越来越广泛.广播电视的信号发射环节非常重要,由于广电发射塔一般地处高山地区,维护维修不便.基于此,设计一种基于网络RTK定位技术的高精度发射塔状态监测方法,可以在保证广电信号安全优质播出方面发挥重要作用.     

ACCELERATION AMBIGUITY FUNCTION OF RADAR SIGNALS AND ITS APPLICATION

High acceleration of radar targets is analyzed using Acceleration Ambiguity Function(AAF). The acceleration resolution based on AAF is defined. The AAF and acceleration resolution of rectangle pulse signal are derivated and the conclusion that its acceleration resolution is in inverse proportion with the square of its duration is drawn. In the end, these conclusions are applied to the parameter designing and performance evaluation for a certain type of pulse Doppler radar.     

双柱塞砂浆泵中工作机构的设计和仿真研究

本文介绍了双柱塞砂浆泵的工作原理，根据机构替代原理建立起双柱塞砂浆泵工作机构的运动分析模型，然后在MatLab环境下，详细介绍了工作凸轮曲线的设计程序，利用计算机设计程序可以方便地分析工作缸活塞以及工作凸轮机构的位移、速度、加速度，利用SIMULINK仿真工具箱进行运动学仿真，为工作机构设计提供相应的理论分析依据。     

用电采集系统停上电事件的数据质量辨识技术

为解决智能配电网抢修服务平台中数据质量缺陷对预警抢修精准度产生负面影响的问题,提出一种针对用电信息采集系统停上电信息的数据质量处理方法.首先使用回归方法对数据整体异常率进行辨识,其次依据完整性、唯一性、一致性、准确性各项辨识指标对停上电数据缺陷进行辨识与处理,最后分析最新数据与历史数据之间的显著关系,辅助实现数据时效性辨识.该方法对源数据的质量进行辨识与处理,为后期平台建设中信息集成和故障研判的开发运行提供可靠的数据支撑.     

挤压机机电控制系统研究

本文探讨了12．5MN轻合金挤压机的机电系统控制问题，对应用电液比例技术，伺服控制技术、模／数、数／模转换器及可编程控制器实现等温挤压的具体方法作了深入细致的研究，文中论述方法对挤压机的机电系统控制具有一定的普遍意义。     

基于气体穿透效果数值模拟的气体辅助注射成型工艺优化

对气体辅助注射成型工艺进行分析，阐述了气体辅助注射成型的关键技术要求在分析熔料流动、气体穿透物理模型的基础上，探讨了气体辅助注射成型数值分析的实现原理运用MPI／Gas模块对一T型支架进行了气体辅助注射成型CAE分析，模拟不同工艺条件下的气体穿透效果，确定了合理的工艺参数。     

Reconstructing the World’s Museums

Virtual exploration tools for large indoor environments (e.g. museums) have so far been limited to either blueprint-style 2D maps that lack photo-realistic views of scenes, or ground-level image-to-image transitions, which are immersive but ill-suited for navigation. On the other hand, photorealistic aerial maps would be a useful navigational guide for large indoor environments, but it is impossible to directly acquire photographs covering a large indoor environment from aerial viewpoints. This paper presents a 3D reconstruction and visualization system for automatically producing clean and well-regularized texture-mapped 3D models for large indoor scenes, from ground-level photographs and 3D laser points. The key component is a new algorithm called “inverse constructive solid geometry (CSG)” for reconstructing a scene with a CSG representation consisting of volumetric primitives, which imposes powerful regularization constraints. We also propose several novel techniques to adjust the 3D model to make it suitable for rendering the 3D maps from aerial viewpoints. The visualization system enables users to easily browse a large-scale indoor environment from a bird’s-eye view, locate specific room interiors, fly into a place of interest, view immersive ground-level panorama views, and zoom out again, all with seamless 3D transitions. We demonstrate our system on various museums, including the Metropolitan Museum of Art in New York City—one of the largest art galleries in the world.     

Chirality of 5,11-dimethylheptadecane,the major sex pheromone component of the hemlock looper,Lambdina fiscellaria (Lepidoptera: Geometridae)

Of the four possible stereoisomers of 5,11-dimethylheptadecane, the major sex pheromone component of the eastern hemlock looper (EHL),Lambdina fiscellaria fiscellaria Guen., and the western hemlock looper (WHL),Lambdina fiscellaria lugubrosa Hulst, (5R,11S)-5,11-dimethylheptadecane was the only stereoisomer eliciting electrophysiological responses by male EHL and WHL antennae. In field bioassays with EHL and WHL populations, traps baited with (5R,11S)-5, 11-dimethylheptadecane caught as many males as did traps baited with all four stereoisomers combined or a synthetic mixture of 5,11-dimethylheptadecanes. Catches in traps baited with the other three stereoisomers did not significantly differ from those in the unbaited control traps. We conclude that male antennae lack chemoreceptors for the other three stereoisomers of 5,11-dimethylheptadecane and hypothesize that only (5R,115)-5,11-dimethylheptadecane is produced by female EHLs and WHLs.     

磷渣掺和料对混凝土力学性能影响的试验研究

针对当前资源能源匮乏、大量固体废弃物处理困难并严重污染环境的情况,以黄磷工业产生的废渣-磷渣为主要研究对象,通过一系列的试验,研究了磷渣作为掺和料在混凝土中的应用.重点研究了磷渣掺和料对混凝土力学性能影响的规律,以期达到合理利用废渣资源、减少环境污染、提高混凝土质量、降低生产成本的目的.