太阳能热泵供暖系统的实验研究

建立了太阳能热泵供暖实验系统,探讨了在不同太阳辐射情况下系统的运行方式,对太阳能热泵供暖系统进行了供暖实验研究。太阳能热泵供暖系统充分利用了太阳能,基本能够满足供暖要求。     

某住宅地源热泵系统夏季运行测试研究

结合重庆市一实际住宅对地源热泵系统夏季运行情况进行了测试,分析了不同回填材料、埋管数、水流量、埋管间距下的系统性能。     

Urinary mercury in people living near point sources of mercury emissions

As part of the European Mercury Emissions from Chlor Alkali Plants (EMECAP) project, we tested the hypothesis that contamination of ambient air with mercury around chlor alkali plants using mercury cells would increase the internal dose of mercury in people living close to the plants. Mercury in urine (U-Hg) was determined in 225 individuals living near a Swedish or an Italian chlor alkali plant, and in 256 age- and sex-matched individuals from two reference areas. Other factors possibly affecting mercury exposure were examined. Emissions and concentrations of total gaseous mercury (TGM) around the plants were measured and modeled. No increase in U-Hg could be demonstrated in the populations living close to the plants. This was the case also when the comparison was restricted to subjects with no dental amalgam and low fish consumption. The emissions of mercury to air doubled the background level, but contributed only about 2 ng/m(3) to long-term averages in the residential areas. The median U-Hg levels in subjects with dental amalgam were 1.2 microg/g creatinine (micro/gC) in Italy and 0.6 microg/gC in Sweden. In individuals without dental amalgam, the medians were 0.9 microg/gC and 0.2 microg/gC, respectively. The number of amalgam fillings, as well as chewing, fish consumption, and female sex were associated with higher U-Hg. The difference between the countries is probably due to higher fish consumption in Italy, demethylated methyl mercury (MeHg) being partly excreted in urine. Post hoc power calculations showed that if the background mercury exposure is low it may be possible to demonstrate an increase in U-Hg of as little as about 10 ng/m(3) as a contribution to ambient mercury from a point source.     

用热流计式导热仪测定导热系数

详细阐述了ＲＪＬ热流式导热仪基本原理、测试及标定，介绍了参与ＩＳＯ／ＴＣ１６３国际导热系数对比测试结果。     

3Cr_2W_8V 钢马氏体一贝氏体复相热处理的研究

采用马氏体一贝氏体复相热处理研究了３Ｃｒ２Ｗ８Ｖ钢强韧化工艺，并作了理论分析．将试验结果用于Ａ１合金压铸模，显著提高了耐磨性，抗热疲劳性和使用寿命．     

不同加载路径饱和岩石力学特征的试验研究

不同加载路径对岩石强度特征、变形特征和破坏特征存在影响。据此，探讨饱和岩石在排水、非排水、比例加载、侧向卸载、在不同偏应力状态下注水和非排水（但在不同偏应力状态下水压力卸载）等加载情况下以及在常规三轴试验和拥有循环加载的三轴试验等试验方式下，岩体的强度特征、各向异性变形特征和破坏特征。试验结果表明：循环加载、饱和岩石在不同偏应力状态下注水、非排水但在不同应力状态下水压力卸载、比例加载和侧向卸载等具有降低岩石强度、增加岩体变形以及水压力对岩石具有劈裂破坏作用等特征，这些力学特征对岩土工程具有现实意义。     

大体积混凝土施工期的水化热温度场及温度应力研究

针对使用低水化热复合硅酸盐水泥的某船闸底板混凝土，利用ANSYS程序对其温度场及温度应力进行了有限元数值模拟分析，并与中水化热普通硅酸盐水泥进行了比较，为大体积混凝土不出现有害温度裂缝的温控防裂措施提供了依据。     

污水源热泵系统和污水冷热能利用前景分析

分析了污水热源／热汇的特点，介绍了以未处理污水作为热源／热汇和以二级出水或中水作为热源／热汇的污水源热泵系统，分析了污水源热泵系统的技术经济性和其应用潜力，介绍了国内外的应用情况，并对其推广使用需要解决的问题进行了探讨。     

Risk of sick leave associated with outdoor air supply rate, humidification, and occupant complaints

We analyzed 1994 sick leave for 3,720 hourly employees of a large Massachusetts manufacturer, in 40 buildings with 115 independently ventilated work areas. Corporate records identified building characteristics and IEQ complaints. We rated ventilation as moderate (approximately 25 cfm/person, 12 ls-1) or high (approximately 50 cfm/person, 24 ls-1) outdoor air supply based on knowledge of ventilation systems and CO2 measurements on a subset of work areas, and used Poisson regression to analyze sick leave controlled for age, gender, seniority, hours of non-illness absence, shift, ethnicity, crowding, and type of job (office, technical, or manufacturing worker). We found consistent associations of increased sick leave with lower levels of outdoor air supply and IEQ complaints. Among office workers, the relative risk for short-term sick leave was 1.53 (95% confidence 1.22-1.92) with lower ventilation, and 1.52 (1.18-1.97) in areas with IEQ complaints. The effect of ventilation was independent of IEQ complaints and among those exposed to lower outdoor air supply rates the attributable risk of short-term sick leave was 35%. The cost of sick leave attributable to ventilation at current recommended rates was estimated as $480 per employee per year at Polaroid. These findings suggest that net savings of $400 per employee per year may be obtained with increased ventilation. Thus, currently recommended levels of outdoor air supply may be associated with significant morbidity, and lost productivity on a national scale could be as much as $22.8 billion per year. Additional studies of IEQ impacts on productivity and sick leave, and the mechanisms underlying the apparent association are needed.     

多层不锈钢波纹管热工性能的实验研究

多层不锈钢波纹管是采用特种不锈钢板材，滚压卷成几种规格圆形薄壁光管，将焊缝错开套装成多层薄壁圆形光管，再经特殊工艺胀波凸起成型。对多层波纹管进行了热工性能实验，并给出该管的优化尺寸范围。