不揭膜谷物冷却降温试验

运用谷物冷却技术，是确保粮食低温储藏的有效方法。我库在夏季采取不揭膜的方式，对高大平房仓内的粮食进行复冷降温和经济运行试验，效果显著，为粮食低温储藏和安全度夏提供了有力保证。     

STUDY ON SELF -SCANNING CIRCUIT OF LOW POWER DISSIPATION MOS IMAGE SENSOR

The paper studies a self- scanned circuit used in MOS image sensor with the demand of developing of high -order.low power disspation MOS image sensor and puts forward a kind of self -scanned circuit .which uses a three tramister dynamic nocomparing circuit whith a changing capacitor bootstrap circuit as MOS image sensor. The circuit adopted a silicon gote P -MOS technique, which is a high -speed low-dissipation dynamic no-coparing circuit. It is a practical unit circuit in the high -order array and solves the problem that the power dissipation of array rises with the increase of the array bite.     

鲜肉真空冷却保鲜工艺的研究

用真空冷却代替现有冷却肉生产过程中采用的风冷，将肉贮藏在 (1± 1)℃的冷柜内。试验结果表明，真空冷却不仅可以大大缩短冷却时间，并且由于降温及时，肉的贮藏质量明显提高，贮藏期由原来的 7天延长到 12天左右 ;经真空冷却后，其肉的重量损失约为 4％～ 5％，在进行真空冷却前向肉表面喷蒸馏水可有效地减少鲜肉的失重。     

Maximum slat width for cooling efficiency of horticultural produce in wooden crates

The influence of wood package design on airflow distribution was investigated for forced-air cooling using horticultural produce simulators. The position of grooves on the container walls was tested using slat width of 100–200 mm and airflow rates ranging from 0.0005 to 0.003 m³ kg⁻¹ s⁻¹. The package opening configurations were compared based on their impact on the energy added to the system using a methodology previously developed. For this purpose, apples and sweet corns were taken as examples of produce from two different extremes in the respiration activity range. For airflow rates as low as 0.0005 m³ kg⁻¹ s⁻¹one groove at the bottom of the container produced a cooling process more uniform than the other one-groove configurations and even two grooves because of natural convection effect. If packing low respiration rate produce, increasing airflow rate could compromise the process energy efficiency because of air circulation obstruction for less vented containers. For high respiration rate produce enlarging open area above 2.4% would be recommended rather than increasing airflow rate to enhance cooling energy efficiency.     

The Numerical Simulation Commercial Software for Secondary Cooling Process in Billet Continuous Casting

A numerical simulation commercial software has been developed by the object-oriented Visual Basic programming language on the basis of the 2D mathematical model of secondary cooling Process in billet continuous casting. Thereby an effective experimenting tool for computer simulation of continuous casting process is gained. By simulation with the software, the caster structures and operating parameters in continuous casting can be designed and optimized. The simulating calculation examples on several casters and its production applications indicate that the commercial software developed has more accuracy, practicability and commonality, as also as simpler operating capability. The simulated results have been successfully applied to the design and production of the high-efficiency modification for several billet casters interiorly.     

太阳能制冷低温储粮应用效果初探

从降低机械压缩式制冷低温储粮能耗及运行成本的角度出发,设计、建造了一台太阳能吸附式制冷系统,并将该系统在高温季节进行了低温储粮的实仓实验。测试结果表明:在夏秋高温季节,采用太阳能制冷系统冷却粮仓上部空气隔离层,可有效降低仓温,抑制粮温回升,实现准低温储粮。经济性分析表明太阳能制冷系统用于低温储粮的运行成本明显低于压缩式制冷谷物冷却机。     

THE WAYS FOR IMPROVING INDOOR ENVIRONMENT AND AIR-CONDITIONING SYSTEMS IN DANCLING HALLS

Since 1988, air temperature, humidity, air quality, noise level and intensity of illumination in lots of dancing halls in China have been investigated and tested. This paper introduces the present situation of indoor environment and air conditioning systems in dancing halls of China. The design indexes of cooling load for room and ontside air are recommended. The reasons for indoor environment deterioration have been found out. From the actual situation of China, the ways for imoroving indoor environment and approach of energy conservation in air conditioning systems are explored.     

钢渣硅肥硅素释放规律及其影响因素研究

【目的】钢渣是缓释硅钙肥原料,钢渣中硅素释放受钢渣自身性能和外界环境条件等因素影响,本文设置了钢渣冷却方式、钢渣粒径、培养介质和培养温度四种因子,研究钢渣中硅素释放规律及其影响因素,为钢渣硅钙肥合理施用提供理论依据。【方法】选用粉末状水淬渣(S1)、粒状水淬渣(S2)和空气冷却粒状钢渣(S3)为研究对象,分别设置在土壤水溶液以及纯蒸馏水中培养97天,并设置35℃和25℃两个培养温度。定期离心取上清液,取样后补充水分继续培养,直至培养结束。【结果】钢渣在土壤溶液中培养,第一天的硅素释放主要由钢渣冷却方式决定,而在以后的培养过程中主要受温度的影响,其次为钢渣粒径;硅素累积释放量与时间的关系可以用幂函数方程y=kxm来拟合;35℃培养97天后,S1、S2与S3钢渣硅的溶出率(累积硅释放量与有效硅的比例)分别为37.3%、30.3%与27.3%;在25℃培养下,S1、S2与S3钢渣硅的溶出率分别为14.3%、7.9%与10.2%。钢渣在纯蒸馏水的培养中,第一天钢渣硅释放主要受温度的影响,而在以后的培养过程中主要受钢渣粒径的影响,温度和钢渣冷却方式对其影响甚微;硅素累积释放量与时间的关系可以用线性方程y=ax+b来拟合;在35℃,S1、S2与S3钢渣硅的溶出率分别为0.22%、0.16%与0.16%。在25℃培养下,S1、S2与S3钢渣硅的溶出率分别为0.17%、0.13%与0.14%。钢渣在土壤溶液培养,25℃培养67天,加入钢渣提高了土壤浸提液的p H值,但之后与CK基本相同;在35℃培养下,加入钢渣的土壤浸提液p H值总体都要显著高于CK处理。纯水培养介质中,两种温度培养下,在同一阶段S1浸提液的p H和EC值都要显著高于S2和S3,温度对p H和EC的影响不显著。【结论】钢渣硅素释放规律主要受培养介质和温度的影响,粒径有一定的影响。在土壤溶液中钢渣硅素释放显著高于在蒸馏水中,35℃比25℃更有利于硅素的释放,粉末状比粒状更有利于硅素的释放。由此认为,钢渣作为硅钙肥在大田施用时,将钢渣磨细做成粉末状产品,施用时随翻耕埋入土壤,初春采用保温措施等都有利于提高钢渣中硅的利用效率。     

双向晶闸管在有载分接开关中的应用

对双向晶闸管的触发电路和过电压RC缓冲电路进行了研究和设计。经理论分析,本设计可以满足10kV电力用户有载调压的需求,具有广阔的发展前景。     

农业建筑蒸发降温技术研究与应用的现状及展望

农业建筑中夏季蒸发降温技术已开发与研究的有湿垫风机、细雾、喷淋与雾帘等方式。该文评述了国内外研究与应用的现状与发展趋势。湿垫风机发展较成熟,应用广泛,应继续完善,同时应开展对细雾降温等其它方式的研究。