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    A Study of Temperature Compensation Methods for a Hot Wire
    热线风速仪温度补偿方法的研究
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    Development and Application of the Hot Wire Method
    热线法的发展和应用
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    HOT WATER BOILER MICROCOMPUTER CONTROL SYSTEM
    热水锅炉微机控制系统
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    THE APPLICATION OF DYNAMIC SYSTEM OPTIMIZATION AND ADAPTIVE ALGORITHM IN HOT ROLLING
    动态系统最优化理论与自适应算法在轧钢中的应用
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    Improvement of Precision in the Thickness Control of Hot Rolled Plates
    提高板材轧机厚度控制精度的研究
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  hot
An immunoenhancing polysaccharide isolated from the hot aqueous extract of mature pods of Moringa oleifera was found to contain only D-glucose as a monosaccharide constituent.
      
The water-soluble glucan was obtained from Pleurotus florida fruit bodies by hot water extraction, ethanol precipitation, DEAE cellulose dialysis and Sephadex G-75 gel filtration.
      
The performance indices of plywood, particleboard and medium density fiberboard (MDF), hot-pressed by nano-SiO2 (1%)/UF resin (F/U molar ratio=1.2), exceeded the requirements of the National Standard.
      
The temperature in the sample and the distance from the hot surface of the sample was strongly linearly correlated.
      
Heat-transfer process during hot-pressing of flakeboard
      
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In this paper a microwave standard noise source which produces noise by healing a metal filament is described. Its design and the measurement of effective noise tem- perature are discussed in detail. A new method for estimating the effect of losses of glass envelope and tuning elements on-the effective noise temperature is presented. The effect of the cold end of the hot filament is also quantitatively corrected. The results of the experiments and the error analysis are given. This noise source can give...

In this paper a microwave standard noise source which produces noise by healing a metal filament is described. Its design and the measurement of effective noise tem- perature are discussed in detail. A new method for estimating the effect of losses of glass envelope and tuning elements on-the effective noise temperature is presented. The effect of the cold end of the hot filament is also quantitatively corrected. The results of the experiments and the error analysis are given. This noise source can give a standard noise with an excess noise ratio up to & db., the maxium possible error being ±0.2 db... Neon-filled. gareous discharge noise tubes are calibrated by using this hot filament stand4rd noise source A new calibrating method is given. The excess noise ratio obtained by calibrating a S-band neon-filled noise the is 18. 58 db., with a maxium posible error ±0.4 db..

本文介绍了一种用加热金属丝来产生噪声的微波标准噪声源。对其设计与有效噪声 温度的量测进行了较详细的讨论。提出了一种量测玻壳和调谐元件损耗对有效噪声温度 影响的方法。对热丝冷端的影响进行了定量修正。 给出了实验结果和误差分析。表明这种噪声源可给出超额噪声比达8分贝的标准噪 声,误差不大于±0.23分贝。 用这热丝式标准噪声源对充氮气体放电噪声管进行了校准。讨论了校准方法,给出 了一种较好的方案,对s波段充氖管校准所得超额噪声比为18.58db,误差不大于 ±0.4 db。

In hot wire anemometer, the Changes of gases temperaturc greatly affect the measurement. The present work deals with the structure of the anemometer which compensates the Changes of the gas temperature. The compensation is based on the theroy of heat diffusion, and two types of sensitive cells are built with compensating elements: straight-pass diffusion and straight-blowdiffusion. Necessary theoretical analysis and experimental work have also been Carried out.

在热风速计中,气体溫度的变化对测量的影响是比较严重的?疚木褪茄芯咳确缢偌撇钩テ逦露缺浠慕峁埂2钩サ脑硎腔谌壤┥?根据这个原理拟定了直通——扩散式及直吹——扩散式两种带有补偿元件的发送器,並作了必要的理论分析和实验研究。

In this article, revolving hot element with directional shield for quick and automatic measurement of velocity and direction of planar flow (wind velocity 0-60 m/sec, direction 0-360°) is proposed. Method of calculating hot element and scheme of temperature compensation have been worked out. Criterion equation for convective heat transmission was obtained. Measuring instrument,type FS-1 for cold environment was analyzed and fabricated in our laboratory. Recording time for taking each reading is about...

In this article, revolving hot element with directional shield for quick and automatic measurement of velocity and direction of planar flow (wind velocity 0-60 m/sec, direction 0-360°) is proposed. Method of calculating hot element and scheme of temperature compensation have been worked out. Criterion equation for convective heat transmission was obtained. Measuring instrument,type FS-1 for cold environment was analyzed and fabricated in our laboratory. Recording time for taking each reading is about 28 sec. Preliminary experiment on instrument, type FS—2 for hot environment (0—400℃) was carried Out.At The end of this article, practical examples of model test in laboratory of conceirned unit and cold/hot environment test in power station boiler plant are presented.

本文提出了采用带方向罩的旋转热柱方案,用来快速自动测量平面气流速度和方向。拟定了旋转热柱的计算方法及温度补偿方式,并得出其对流放热的准则方程,在理论分析的基础上,研制了FS—1型冷态快速风向风速自动测量仪,对FS—2型热态(0~400℃)风向风速仪进行了原理性试验,文中最后提出了在有关单位验试室模型试验及电站锅炉现场冷、热态试验应用的例子。

 
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