高辐射覆层对热风炉传热过程影响的数值模拟

针对"高辐射覆层技术"在山东石横特钢集团1 080m3高炉两座热风炉上的应用,使用CFD软件对蓄热室内部传热和流动过程进行了数值模拟,分析了有覆层(1号热风炉)和无覆层(3号热风炉)热风炉的热风流动和传热过程,建立了蓄热室内部辐射与对流换热过程数学模型,得到了3号和1号热风炉的燃烧期的烟气温度与格子砖表面温度差的变化规...     

辐射管空气系数计算及温度场模拟

根据空气系数的经验数据计算出辐射管温度曲线和单耗,选择最佳空气系数;利用FLUENT商用软件对辐射管中的燃烧过程进行数值模拟,讨论辐射管内流场及温度场的影响因素.结果表明:这项工作可以优化辐射管结构设计,对各种性能指标作出评价.     

声波透射法分析桩身混凝土质量的相对强弱指标法

介绍了传统桩基检测中判别桩身混凝土质量的判据方法,在此基础上提出了一种新的参数分析方法——相对强弱指标法.这种方法综合了声速、波幅、频率、声时、PSD多方面的因素,通过比较,它比以往的判别方法更能够准确地对桩基质量进行定性分析,并且还能进行一定的定量分析.经过取芯验证,证实此法确实可行有效,有一定的实用价值.     

A coaxial HOM coupler for a superconducting RF cavity and its low-power measurement results

A resonant buildup of beam-induced fields in a superconducting radio frequency （RF） cavity may make a beam unstable or a superconducting RF cavity quench. Higher-order mode （HOM） couplers are used for damping higher-order modes to avoid such a resonant bu     

Preparation of a silicon micro-strip nuclear radiation detector by a two-step annealing process

The annealing process for boron implantation is a crucial step during large size nuclear radiation detector fabrication. It can reduce the lattice defects and the projection straggling. A two-step annealing process for boron implantation was developed ins     

回转窑温度神经网络控制

球团焙烧是一个复杂的物理和化学变化过程,通过对该过程的分析,提出了回转窑温度控制的基本算法,以及基于神经网络的回转窑温度控制方法。用实际生产数据作为神经网络的训练输入,模拟得出回转窑目标温度与相关输入的线性模型,为回转窑最优控制提供了最佳的温度设定值。     

Mechanism of Infrared Detection and Transduction by Beetle Melanophila Acuminata In memory of Jerry Wolken

The Melanophila acuminata beetle is attracted to forest fires via a pair of infrared sensory organs composed of sensilla. Our histological work showed that each sensillum contains lipid layers surrounding a protein layer and a unique polysaccharide base that is associated with a neuron to each sensillum. Infrared microscopy showed that the protein region maximally absorbs infrared radiation at 3 μm wavelength and at 10 μm, which corresponds to the known radiation produced by forest fires at 3 μm.Mathematical calculations showed that the physical properties of the sensilla are such that the expected temperature rise is insufficient for transduction of the infrared signal through mechanical means or as a thermal receptor as previously thought;hence the protein plays the pivotal role in perception of single photons and transmission of the signal within the sensilla.     

西南地区冬季气温和降水的时空变化

In recent years, the socio-economic impacts of winter extreme climate events have underscored the importance of winter climate anomalies in Southwest China (SWC). The spatio-temporal variability of surface air temperature (SAT) and precipitation in SWC and their possible causes have been investigated in this paper based on observational data from 1961 to 2010. The results indicate that SAT anomalies in SWC have two dominate modes, one is homogenous, and the other a zonal dipole. The former is caused by the anomalies of East Asian winter monsoon; the latter arises from the anomalies of both subtropical west Pacific high and regional cold air in lower troposphere. The most dominant mode of precipitation anomalies in SWC is homogenous and it has a high correlation with northern hemisphere annular mode (NAM, AO). Neither NAM nor ENSO has significant impacts on SAT in SWC.The anomalies of NAM are associated with the anomalies of tropical circulations, and there-fore precipitation over the SWC. When NAM is in positive (negative) phase; the winter pre-cipitation is more (less) than normal in SWC. Winter precipitation increase over the whole SWC is associated with the El Ni o. However, during La Nifia winter, the pattem is not uni-form. There is an increase in precipitation over the central parts and a decrease in western and eastern parts of SWC. The severe drought in SWC in winter 2010 is more, likely caused by anomalies of NAM, not EI Ni(n)o.     

空调热水一体机制冷兼制热水模式的模糊判定

基于目前空调热水一体机在制冷兼制热水模式时,随着水箱温度的不断升高,机组制冷能效比下降和制冷量减少的问题,提出采用以水箱温度为切换点,控制水冷到风冷的切换。以前一日的切换温度和环境温度变化量为输入,当日的切换温度为输出设计模糊判定控制系统,并对其控制效果进行MATLAB仿真。结果表明,以前一日的切换温度和环境温度变化量为依据能够对当日的切换温度作出合适的判定。     

上海市陆家嘴X3-2项目地板送风系统设计

对上海市陆家嘴X3-2项目地板送风系统的末端装置选型、控制方式及系统的全年运行策略进行详细阐述,并与传统的顶送式变风量系统进行经济性比较。希望该工程实例对于完善地板送风系统的设计理论及应用有一定的参考价值。