机械过冷的制冷系统在汽车空调中的应用

由于很多汽车空调采用斜盘式压缩机，有利于采用机械过冷的制冷系统，来增加汽车空调的制冷量、提高制冷效率。本文的主要目的是通过对系统工质的流量分配、空调制冷量和性能系数(COP)与中间压力之间的变化关系的研究，来研究机械过冷在汽车空调中应用的可行性。     

空气压缩机无油润滑在山脚树矿的应用

山脚树矿有5台1966年上海生产的4L—20/8空气压缩机,运行很不经济,利用聚四氟乙烯合成材料制成活塞环,全部实现无油润滑运转,取得了良好的经济效益。     

"摩圣"技术在空气压缩机上的应用

介绍了4L-20/8型空气压缩机采用"摩圣"技术后的运行情况。"摩圣"技术在设备正常运行条件下能成功修复摩擦副的磨损,使之恢复原设计的尺寸和要求,因而提高了生产效率,取得了显著的经济效益。     

小型别墅中央空调的新风设计

提出了小型别墅中央空调新风处理的方法，就某别墅采用本方法作中央空调新风设计，并以其计算数据为依据，验证了本方法的可行性。     

浅谈城市道路立交的概念性方案设计

通过南昌市某快速路的设计实例，认识到搞好快速路沿线各交叉口的方案设计是快速路规划设计的关键内容。道路交叉口设计应注重交通功能分析，满足路口交通需求，同时也不能忽视立交的景观要求。     

码分多址（CDMA）技术和公用空中接口综述

本文主要讨论数字移动通信中扩频码分多址技术，阐明了ＣＤＭＡ体制的优越之外，分析了ＣＤＭＡ的关键技术，全面介绍了ＣＤＭＡ系统设计的基本原则和ＩＳ－９５－Ａ空中接口标准的含义。     

Design and Characterization of the CLIMPAQ,Chamber for Laboratory Investigations of Materials,Pollution and Air Quality*

A test chamber has been developed in order to provide a small and simple emission testing facility capable of testing construction products in a climate where the important climatic parameters such as temperature, ventilation rate and air velocity can be varied independently around typical indoor values. The test chamber CLIMPAQ is made of panes of window glass. Other main surface materials are stainless steel and eloxated aluminium. The chamber has a volume of 50.9 litres and is designed to meet the requirements for quantifying air pollution. In this investigation human subjects acted as air pollution judges, and chemical characterization of the air pollution was carried out. Carpet, linoleum, wall paint and seal- ant were tested simultaneously in the CLIMPAQ and in four other chambers ranging from a full-scale chamber of 28 m³ to a field and laboratory emission cell of 3.5· 10^?5m³. Product ranking is the same in all chambers for the sensory measurements. Emission rates based on sensory measurements differ for all products less than 100 % except for tests in a 3-litre chamber where emission rates were higher. Chemical measurements differ up to approximately 10 times for the same product in different chambers. Deviations appear to be the result of different environmental parameters in the various chambers. Low air concentrations or high specific ventilation rates seem to increase emissions, while differences in air velocities and sink properties may also be the cause of differences in emission rates.     

Evaluation of Serum Volume Losses During Long-Term Storage

Aliquots of serum collected in a large case-control study of cervical cancer were stored at −70°C for up to 4 years during implementation of the study. When 500 μL serum aliquots were thawed in preparation for carotenoid and vitamin A assays, volumes were noticeably variable and fell below 500 μL in the majority of the samples. We were concerned about evaporation/sublimation during storage of the samples because loss of water would concentrate the analytes of interest. We evaluated the use of density and sodium ion concentration measurements to confirm its occurrence. We found that serum density was an unreliable indicator of extent of volume loss since the anticipated increases in density due to evaporation were of the same magnitude as inter-individual variation in serum density. In contrast, Na⁺ concentration is tightly regulated and would rise if water had been lost from the samples. In a representative sample of serum aliquots from the case-control study, 24 of 25 vials contained less than 500 μL of serum. The mean sodium ion concentration (138.1 ± 3.6 mmol/L) was within the normal range for human serum of 136–145 mmol/L, and no correlation was observed between serum volume and Na⁺ concentration. These results strongly suggest that the observed low volumes were not due to evaporative losses. Instead, the variably low volumes of serum aliquots were probably due to pipetting errors in the initial aliquotting resulting from the use of air-displacement pipettes.     

大泵站超驼峰水位运行压缩空气断流系统的设计方法

阐述了压缩空气断流的原理，提出了压缩空气断流装置的一般构成和设计方法，首次应用气体喷射器作为压缩空气减压增量变换器，不但及时地增加了补气量，防止断流后流道压力的下降，而且大大减小了储气罐容积，使该项技术得以满足工程实际的要求，为同类泵站的技术改造