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汾曲香酒蒸馏中杂醇油主要组份变化情况探讨 被引量:1
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作者 罗改玲 段丽红 马立峰 《宁夏农林科技》 2004年第1期53-54,62,共3页
关键词 杂醇油 酿酒 汾曲香酒 蒸馏 白酒 质量控制 色谱分析 组份变化
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利用大气超级站对乌鲁木齐市一次沙尘天气过程及组份的分析 被引量:8
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作者 范圣虎 张飞云 《干旱环境监测》 2021年第1期15-22,共8页
本研究利用大气超级站对乌鲁木齐市4月9日至10日沙尘天气过程,粒径谱、离子和重金属组成及变化进行分析。研究结果表明激光雷达观测结果与环境空气质量监测基本一致;小粒径颗粒在沙尘和非沙尘时段含量最多,但在沙尘时段大粒径颗粒的增... 本研究利用大气超级站对乌鲁木齐市4月9日至10日沙尘天气过程,粒径谱、离子和重金属组成及变化进行分析。研究结果表明激光雷达观测结果与环境空气质量监测基本一致;小粒径颗粒在沙尘和非沙尘时段含量最多,但在沙尘时段大粒径颗粒的增长幅度远大于小粒径;沙尘过程中的离子主要来源于土壤一次源;沙尘过程中地壳元素浓度及占比均显著升高,会稀释环境空气中人为污染元素。 展开更多
关键词 一次沙尘天气过程 组份变化 乌鲁木齐市 大气超级站
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Board Members Oversight System- A Polish Example
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作者 Marek Pawlak 《Journal of Modern Accounting and Auditing》 2011年第11期1229-1249,共21页
The goal of the study was the development of a system to monitor the members of supervisory and management boards. The system currently covers 8,454 joint stock companies registered in Poland. The main purpose of the ... The goal of the study was the development of a system to monitor the members of supervisory and management boards. The system currently covers 8,454 joint stock companies registered in Poland. The main purpose of the system is to monitor every change in the composition of every board of every joint stock company, from March 2001 up to the present, and it is updated every month. This system, however, also enables us to confirm some of the theories from the field of corporate governance. A generation change has been identified in the boards of the joint stock companies which were examined. Women constitute a large, and continuously increasing, section of the board members. The number of family companies, and of family involvement in boards, is still increasing. Board members of financial institutions (and not just of banks) possess significantly more directorates than board members of non-financial institutions. The number of interlocking directorates is positively linked to the macroeconomic development indicator of the total investment as percentage of GDP for Poland. 展开更多
关键词 board composition supervisory board two-tiered board Poland
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R236fa/R32混合制冷剂变浓度制冷系统的性能研究 被引量:4
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作者 余鹏飞 张小松 +1 位作者 刘剑 颜华周 《建筑科学》 CSCD 北大核心 2016年第12期167-172,共6页
本文对应用于变蒸发温度制冷系统的混合制冷剂R236fa/R32的饱和蒸气压力、泡露点温度、滑移温度特性进行了理论研究;建立了变蒸发温度制冷系统的计算模型;通过混合工质变组份的理论和实验研究,对机组的性能参数进行了分析;并与常规单一... 本文对应用于变蒸发温度制冷系统的混合制冷剂R236fa/R32的饱和蒸气压力、泡露点温度、滑移温度特性进行了理论研究;建立了变蒸发温度制冷系统的计算模型;通过混合工质变组份的理论和实验研究,对机组的性能参数进行了分析;并与常规单一制冷剂制冷系统进行了性能比较。研究结果表明:大温度滑移的混合工质可实现一机变蒸发温度的特性;R236fa/R32(0.4:0.6)的COP值最高,压缩机功率最低;混合工质变蒸发温度制冷系统相对常规单一制冷剂制冷系统优点是COP值升高,压缩机功率降低,缺点是排气温度升高,但满足压缩机安全稳定运行要求。 展开更多
关键词 混合工质 滑移温度 组份变化 常规单一制冷剂 性能研究
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