风载荷对雷达天线座的影响与评估

风载荷是机载雷达舱外设备和地面雷达露天设备的主要设计载荷,是设计方案的源头。文中分析了风载荷对雷达天线座的影响,探讨风荷系数确定、设计风速选取及电机驱动力估算的经验和方法。同时,结合某机载雷达研制实例,通过静态风洞试验获取各项风荷系数,并将风力矩计算结果与动态风洞实测数据进行对比分析,给出风力矩计算的建议。希望帮助雷达结构设计师加深对风载荷的认识,更全面、客观地评估风载荷对天线座设计的影响。     

机械扩底灌注桩在桩基施工中的应用

论述了扩底灌注桩的优越性,通过工程实例,详细介绍了干作业成孔的机械扩底灌注桩的施工工艺,对桩基进行了检测,得到了桩基满足设计要求的结论,对同类条件的桩基施工具有一定的借鉴作用。     

沉管夯扩灌注桩的施工监理

以某高校教学楼沉管夯扩灌注桩基础工程监理为背景 ,介绍了沉管夯扩灌注桩在施工中的质量控制要点和桩基检测的内容 ,并对检测结果进行了分析     

Stimulus quality affects expression of the acoustic startle response and prepulse inhibition in mice.

The relationship between stimulus intensity and startle response magnitude (SIRM) can assess the startle reflex and prepulse inhibition (PPI) with advantages over more commonly used methods. The current study used the SIRM relationships in mice to determine differences between white noise and pure tone (5 kHz) stimuli. Similarly to rats, the SIRM relationship showed a sigmoid pattern. The SIRM-derived reflex capacity (RMAX) and response efficacy (slope) of the white noise and pure tone stimuli in the absence of prepulses were equivalent. However, the pure tone startle response threshold (DMIN) was increased whereas the stimulus potency (1/ES??) was decreased when compared to white noise. Prepulses of both stimulus types inhibited RMAX and increased DMIN, but the white noise prepulses were more effective. Both stimulus intensity gating and motor capacity gating processes are shown to occur, dependent on prepulse intensity and stimulus onset asynchrony. Prepulse intensities greater than 10 dB below the startle threshold appear to produce PPI via stimulus intensity gating, whereas a motor capacity gating component appears at prepulse intensities near to the startle threshold. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

台基雕饰题材的文化解读

中国古代建筑中台基极富装饰性,装饰题材广泛．本文通过对台基雕饰的研究与分类,展示了它们与中国华夏民族息息相关的独特的文化渊源．     

须弥座探源

本文是对中国传统建筑台基形式须弥座的起源的探讨,及由此折射出的古代中国与古印度、乃至古希腊、古罗马之间的文化交流．     

塑料基座盖注射模设计

分析了带嵌件的汽车天线基座盖塑料零件的工艺特点,介绍了适合该塑件注射成型模具的特殊结构设计,并说明了该模具的工作过程。     

舰载天线座少齿差行星减速器的优化设计

结合工程实际,从建立数学模型、确定算法、编制计算程序等方面,对舰载天线座少齿差行星减速器的优化设计进行研究和总结,并通过工程应用实例验证了研究结果的正确性。     

小型PLC多机联网在自动输送线中的应用

介绍了小型PLC多机联网通信在自动输送线中的应用,分析了自动输送线的系统构成,阐述了系统的控制方案及其实现过程。指出利用PPI网络对小型任务进行控制方便可靠,不但投资小,而且可极大地提高控制的自动化程度。     

Progress in Understanding Plasma‐Propellant Interaction

To explore the phenomena of the plasma‐propellant interaction (PPI) and to point out the role of radiation, a series of experiments have been performed at the U.S. Army Research Laboratory. For this, the plasma radiation to the propellant has been separated from all other energy transfer mechanisms. The results clearly indicate that the observed structural damage of translucent JA2 samples is due to radiation only. An other aim of this work is to clarify some misunderstandings in analyzing plasma‐propellant interaction. By variation of the electrical pulse length it will be shown that electrical energy is in no way a useful parameter to characterize propellant response to variable plasma igniter systems.