Research progress in the study of atmospheric pressure glow barrier discharge

Atmospheric pressure glow barrier discharge (APGBD) can operate at high pressure, and so vacuum device is not necessary. Furthermore, the produced plasma by APGBD has moderate electron temperature and density besides good uniformity. Therefore, APGBD has extensive potential applications in industry and has been becoming a hot issue in the research of low temperature plasma. In this paper, the main problems in the study of atmospheric pressure glow discharge generated by dielectric barrier discharge, including the experimental setup, judging criterion, discharging conditions, physical mechanisms, and parameter diagnoses, are discussed, and further research prospects of APGBD are proposed.     

An experimental study on variation of thermal fields during the deformation of a compressive en echelon fault set

The temperature variations during deformation of a compressive en echelon fault set in a rock sample were measured by a surface measurement system with multi-point platinum resistance thermometers and an infrared thermal image system. The measurements obtained by the two systems were in agreement with each other, indicating a relationship between temporal-spatial variations of the thermal field and changes of stress and strain. At varied structural positions of the rock sample, the rising of the temperature was different, implying distinct stress distributions at these positions. In the experiment, the deformation process of the sample included three stages: elastic deformation, stick-slip, and rupture. Correspondingly, the variation process of temperature had also three stages, each of which had its own temperature rising profile. And the thermal radiation field showed a similar process. These phenomena mean that the dominant mechanisms of temperature rising in all stages of deformation are different. Experimental results provide a physical basis for the study of current fault activities by using data of satellite infrared images.     

高温工质冷凝换热试验台冷却水温度控制方法

在高温工质冷凝换热试验台中,冷却水供水温度的稳定性直接影响高温工质冷凝换热的试验结果.建立了冷却水加热设备——冷却水高位水箱的传递函数及控制传递函数模型,选择了积分分离式PI控制嚣,利用C Builder语言开发了冷却水温度计算机控制程序,设计了计算机监控系统.控制试验结果表明该PI温控系统响应快、抗干扰性好,控制精度高为(±0.2)℃.     

食品双螺杆挤出机温控系统的模糊免疫PID控制

食品双螺杆挤出机机筒温度对挤压产品产量和质量影响很大,实现对机筒温度的有效控制是一项重要工作.建立控制对象的数学模型,借鉴生物体免疫机理,设计出模糊免疫PID控制器,并进行了仿真研究.结果表明,该温控系统鲁棒性强,响应速度快,动态误差小,性能优于单一的PID控制,能满足食品加工工艺的要求.     

蒸发式冷凝器空调系统的性能及应用

对基于蒸发式冷凝器的空调系统进行了性能测试,发现即使在相对湿度较大的运行环境下,空调系统的性能系数(COP)仍可达3.5左右;空气湿球温度对蒸发式冷凝器的排热性能影响明显,在测试范围内,当其它控制参数不变时,湿球温度每上升1℃,排热量下降5%左右.对蒸发式冷凝器及空调系统进行了变工况条件下的性能测试,结果表明随着冷负荷的降低,系统COP和冷凝器能效比均有所下降,但采用变风量的运行控制策略,系统性能系数可提高5%以上.通过与空冷式空调系统的比较分析,表明即使在夏热冬暖地区,基于蒸发式冷凝器的空调系统仍具有较好的应用前景.     

城市固体垃圾热解设备与特性研究

针对无筛分城市垃圾热解的实用技术进行了研究,开发出内热源和外热源联合使用的垃圾热解设备.同时对设备的温度变化、垃圾热解特性、产气规律以及影响热解气热值的主要因素等进行了详细的分析.结果表明:实用热解设备的产气率高,理想热解温度在700℃以下.垃圾热解气中H2的体积分数达15.2%,C2H4,C2H6,C3H6和CH4的体积分数总和是10%,热解气的平均热值为7546.4 kJ/m3.设备运行稳定且温度特性满足设计要求.     

低浓度氨氮污水厌氧氨氧化影响因素试验

针对我国城市污水氨氮浓度低、碳源不足的特征及处理出水难以达标的情况,采用序批式生物反应器(SBR)研究低浓度氨氮条件下厌氧氨氧化反应途径及其影响因素.采用自配进水.经过5个月的厌氧运行,成功启动了厌氧氨氧化反应器.在稳定运行期,NH4 -N平均去除率这94.5%;NO2--N平均去除率达97.4%.在此基础上,研究了pH值、温度及化学需氧量(COD)对厌氧氨氧化反应过程的影响,并确定各因素的最佳控制范围.研究结果表明:在低质量浓度氨氮(NH4 -N～12 mg/L)条件下,厌氧氨氧化反应pH值为7.5～8.0、温度为30～35℃、COD为0～50 mg/L时反应达到最佳状态,为我国低浓度氨氮城市污水的生物脱氮提供了新的途径.     

雪里蕻菜腌制中亚硝酸盐的生长规律的研究

亚硝酸盐是一种对人体有害的物质。本文研究了雪里蕻在腌制过程中亚硝酸盐形成的动态变化。结果表明亚硝酸盐的形成与雪里蕻的腌制时间、食盐浓度、温度等因素有关，为腌制雪里蕻工业生产的质量控制和人们的食用安全提供了参考数据。     

利用电导法测定离子液体的CMC值

利用电导法分别测定了咪唑类离子液体C12mimBr、C14mimBr、C16mimBr和季铵盐类表面活性剂C16H33N (CH3)3Br-在不同的溶剂水、乙醇、乙酸中的临界胶束浓度(CMC).发现离子液体的CMC值具有一定的规律性:其CMC值随疏水基团中碳氢链的增长而减小,离子液体在不同溶剂中的电导率的变化规律,其顺序为:k(水作溶剂)＞k(乙醇作溶剂)＞k(乙酸作溶剂).在相同温度下,离子液体的电导率随浓度的增大而增大.在相同的测定条件下,离子液体的电导率随着其侧链基团中碳氢链的增长而减小.C12mimBr、C14mimBr、C16mimBr在不同溶剂中的CMC值顺序为:CMC(水作溶剂)＞CMC(乙醇、乙酸作溶剂)     

采收时期、时间对芳香植物精油的影响

不同时期和不同时间采收,芳香植物精油含量和成分的差别很大,通过分析采收时期和采收时间对芳香植物精油含量和成分的内在影响,为芳香植物的适宜采收、提高精油产量和质量提供参考.