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961.
Leena Korpinen Rauno Pääkkönen Fabriziomaria Gobba 《International journal of occupational safety and ergonomics》2018,24(1):82-90
Recently, computer, mobile phone and Internet use has increased. This study aimed to determine the possible relation between self-reported wrist and finger symptoms (aches, pain or numbness) and using computers/mobile phones, and to analyze how the symptoms are specifically associated with utilizing desktop computers, portable computers or mini-computers and mobile phones. A questionnaire was sent to 15,000 working-age Finns (age 18–65). Via a questionnaire, 723 persons reported wrist and finger symptoms often or more with use. Over 80% use mobile phones daily and less than 30% use desktop computers or the Internet daily at leisure, e.g., over 89.8% quite often or often experienced pain, numbness or aches in the neck, and 61.3% had aches in the hips and the lower back. Only 33.7% connected their symptoms to computer use. In the future, the development of new devices and Internet services should incorporate the ergonomics of the hands and wrists. 相似文献
962.
Laura Annika Sormunen Tommi Kaartinen Riina Rantsi 《International Journal of Sustainable Engineering》2018,11(4):261-271
In many European countries, the environmental properties of waste-derived aggregates are mostly assessed based on laboratory leaching tests such as the standardised percolation tests CEN/TS/14405, ISO/TS 21268-3, or DIN 19528. These tests are conducted under specified conditions, which are similar yet somewhat different from realistic field conditions. Therefore, this study aimed to investigate the leaching properties of ADR (Advanced Dry Recovery) recovered MSWI BA in the field in order to understand more about its environmental impacts in actual civil engineering structures. Two field scale studies (a lysimeter and a larger interim storage field study) were constructed and the leachate quality was investigated. These results were then complemented with the results of previously conducted laboratory leaching tests using a liquid to solid ratio (L kg?1) comparison. The results demonstrated that the leaching behaviours of many potentially harmful substances, such as chloride, copper and antimony, was similar despite the study scale. In addition, this study illustrated the importance of investigating the leaching properties of waste-derived aggregates on a larger scale, even though the uncertainties in such studies may not be easily controlled. 相似文献
963.
964.
Cyrys J Pitz M Hazenkamp-von Arx ME Künzli N Heinrich J 《Environmental monitoring and assessment》2006,119(1-3):161-171
As part of the European Community Respiratory Health Survey (ECRHS) PM2.5 (particles collected with an upper 50% cut point of 2.5 μm aerodynamic diameter) was measured using an EPA-WINS (Environmetal Protection Agency Well Impactor Ninety-six) sampler. The monitoring schedule was restricted to 7 days per month for one year. Simultaneously, during this one year study period a collocated Harvard Impactor (HI) was run on a daily basis in Erfurt, Germany. Here we validated the reliability of annual, seasonal and monthly means estimated using the ECRHS scheme (measurements taken less than 25% of the whole study period) with the ‘true’ long-term averages, which were estimated using all available daily means.The daily PM2.5 means, obtained by both instruments operated in parallel, were only slightly different (the mean difference between EPA-WINS and HI was 1.8 μg m−3 and 2.8 μg m−3 for the winter means). The values obtained by the two instruments were highly correlated (r = 0.95).In view of that negligible difference, no additional bias was seen with respect to the annual and the winter means estimated by the two different sampling strategies (the difference was 1.7 μg m−3 and 2.7 μg m−3, respectively). Monthly means, however, can only be considered to be a crude estimate that may substantially under- or overestimate the true monthly mean value. 相似文献
965.
966.
环境空气中二氧化硫的自动监测及问题研究 总被引:3,自引:0,他引:3
介绍了空气中 SO2 的测定方法脉冲荧光法 ,对有关的问题进行了初步探讨。为正确使用该方法及仪器提供了依据。 相似文献
967.
从致异味物质的性质、产生环节和感官类别3个方面,分析了饮用水异味的来源,以及因水厂净水剂、供水管网、工业污染、生活污染、复合污染等产生异味的原因。在对饮用水异味案例进行具体分析的基础上,阐述了致异味物质的检测方法,并提出饮用水异味事件的预防和应对措施。 相似文献
968.
高效液相色谱法测定稻田中氰氟草酯 总被引:2,自引:0,他引:2
分别对长沙、杭州、长春3处试验田实施氰氟草酯10%水乳剂在稻田环境中的消解动态与最终残留量试验,样品前处理后用高效液相色谱法测定。该方法在5.00μg/L~5 000μg/L范围内线性良好,稻田水方法检出限为0.01 mg/L,土壤、植株、稻米和稻壳检出限为0.05 mg/kg~0.07 mg/kg,加标回收率为78.4%~109%,5次试验结果的RSD为1.6%~7.0%。氰氟草酯10%水乳剂在田水、土壤及水稻植株中的半衰期t1/230 d,属于易消解农药。农药推荐使用剂量下(1 050 g/hm2),3处试验田收获的稻米最终残留量均为未检出。 相似文献
969.
采用酸化破乳法治理辛醇废碱液达到了治理目的,治理后的废水,CODCr去除率达到50%,油去除率达到80%以上,治理后的废水进入化工污水场未对化工污水造成任何不利的影响。采用该工艺治理辛醇废碱液在工艺上是可行的。 相似文献
970.