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991.
对镇海炼化公司所采取的石油化工作业场所作业人员健康促进措施进行了效果评价.评价结果发现,职工职业安全卫生知识知晓率、正确态度和行为形成率有所提高,健康促进工作初见成效. 相似文献
992.
Wenqiang SUN Jiuju CAI Hai YU Lei DAI 《Frontiers of Environmental Science & Engineering》2012,6(2):265-270
This work aims to identify the main factors influencing the energy-related carbon dioxide (CO2) emissions from the iron and steel industry in China during the period of 1995–2007. The logarithmic mean divisia index (LMDI) technique was applied with period-wise analysis and time-series analysis. Changes in energyrelated CO2 emissions were decomposed into four factors: emission factor effect, energy structure effect, energy consumption effect, and the steel production effect. The results show that steel production is the major factor responsible for the rise in CO2 emissions during the sampling period; on the other hand the energy consumption is the largest contributor to the decrease in CO2 emissions. To a lesser extent, the emission factor and energy structure effects have both negative and positive contributions to CO2 emissions, respectively. Policy implications are provided regarding the reduction of CO2 emissions from the iron and steel industry in China, such as controlling the overgrowth of steel production, improving energy-saving technologies, and introducing low-carbon energy sources into the iron and steel industry. 相似文献
993.
蔡夏林 《中国个体防护装备》2014,(1):24-27
本文系统阐述了GB/T 28288-2012国家标准中防刺穿垫的技术要求、检测设备的主要技术参数、检测方法和质量判定,以及不同标准对同一技术要求出现不一致时的说明,为生产企业产品质量改进和使用企业产品选用提供指导。 相似文献
994.
国外油气管道安全管理经验及启示 总被引:1,自引:0,他引:1
近年来,我国油气管道发展迅猛,管道数量激增;上世纪70!80年代修建的管道逐渐进入老龄化,管道事故呈上升趋势。文章对美国、加拿大和欧盟国家油气管道的发展现状和事故情况进行了介绍,重点对以美国为代表的国外油气管道安全管理先进经验进行了分析,并针对当前我国油气管道安全管理的形势和问题,提出了一些建议。 相似文献
995.
In response to insect herbivory, plants emit volatiles that are used by the herbivores’ natural enemies to locate their host or prey. Herbivore attack also enhances tea aroma. Herbivore-induced plant volatiles (HIPVs) vary both quantitatively and qualitatively with infestation duration and herbivore density. Thus, whether HIPVs can reliably communicate the identities of herbivores is of interest. Here, we studied the tea plant volatiles induced by the tea leafhopper (Empoasca vitis, a piercing–sucking insect), the tea geometrid (Ectropis oblique, a chewing insect), and methyl jasmonate (MeJA, a plant hormone). Geometrid feeding induced more complex volatile blends than did leafhopper infestation. The volatiles induced by both herbivores significantly increased in quality and quantity with time during the first 16 h of infestation, after which the profiles of induced volatile blends and the emission of induced compounds varied diurnally. (E)-β-Ocimene displayed a unique rhythm in which emission peaked at night. The amount of HIPVs significantly increased, while their profiles changed little, with herbivore density. Overall, the leafhoppers and geometrids induced significantly different volatiles from tea plants, while the HIPV profiles varied with a circadian rhythm and were similar at different herbivore densities. Our findings also suggest a new method of enhancing tea flavor using exogenously applied plant hormones, because the volatiles induced by leafhoppers and MeJA were similar in general composition. 相似文献
996.
土壤中铜的生物可给性及其对人体的健康风险评价 总被引:3,自引:0,他引:3
为了研究土壤中铜的生物可给性与土壤理化性质之间的相互关系以及人体无意摄入土壤铜的风险,采集我国一些地区的15个土壤样品,利用in vitro方法研究了这些土壤中铜的生物可给性及其对人体的健康风险。结果表明,有2个土壤样品中铜的含量高过我国土壤环境质量标准的三级标准,有8个土壤样品中铜的含量高过二级标准;土壤中铜的溶解态浓度及其生物可给性变化很大,胃肠阶段铜的溶解态含量分别为5.2~308.8 mg·kg~(-1)和5.9~348.5 mg·kg~(-1),平均值分别为74.8 mg·kg~(-1)和82.0 mg·kg~(-1);而铜的生物可给性分别为183%~66.6%和213%~77.4%,平均值分别为442%和51.1%。胃阶段铜的生物可给性与土壤有机质和pH呈显著正相关,而与粘粒呈显著负相关,与铁铝氧化物有显著相关性;小肠阶段铜的生物可给性与土壤有机质和pH呈显著正相关,与土壤中总铜和锰氧化物含量呈显著负相关。如以胃阶段为判断,无意摄人土壤中铜对儿童的TDI(tolerable daily intake)贡献率除浙江富阳为2.51%外,有12个土壤样品低于1.00%,最低为0.11%。如以小肠阶段为判断,无意摄入土壤中铜对儿童的TDI贡献率除浙江富阳和浙江台州的土壤分别为2.83%和2.01%,另有12个土壤样品低于1.00%。可见,对于本研究中大多数土壤,通过口部无意摄入土壤中铜的对人体并没有很高的风险。 相似文献
997.
998.
SUMMARY An interdisciplinary team of 10 completed an exploratory one-month survey of villages in Nahom, Oudomxay Province, Laos, an area representative of upland farming systems based on opium and shifting cultivation. The study included investigation of the physical and socioeconomic environments and assessment of the farming systems. Due to the relatively low population density, there is enough land for villagers to practice shifting cultivation with a one year cultivation cycle, followed by 10–12 years of fallow. The soil degradation commonly caused by shifting cultivation was not significant in this area and the soil fertility is still relatively high. However, most of the original forests had been cut down and used for shifting cultivation and some degradation of the vegetation has occurred, showing that the ecological sustainability has been threatened by prevailing practices. Thirty-six percent of the households had food supply problems for more than three months of each year. The extremely low return for labour from upland rice cultivation, only 5.64 kg per labour-day, was the critical factor that caused the food shortage. Because of poor technique, rice yield from paddy fields was also low, thus shifting cultivators have no enthusiasm to expand their paddy fields. Income from opium provided 80.5% of household income. Opium was extremely tempting to local people due to the very high return for labour, 5700 kip (US$6) per labour-day, low investment, and good labour availability (mostly during the off-season of rice cultivation). However, opium was also a ‘two-edged sword’. It did not bring real wealth, health and happiness but instead brings poverty, poor health and disappointment. 相似文献
999.
Jingjing PENG Hong LI Jianqiang SU Qiufang ZHANG Junpeng RUI Chao CAI 《Frontiers of Environmental Science & Engineering》2013,7(4):559-567
Pyrene, a representative polycyclic aromatic hydrocarbon (PAH) compound produced mainly from incomplete combustion of fossil fuels, is hazardous to ecosystem health. However, long-term exposure studies did not detect any significant effects of pyrene on soil microorganism. In this study, short-term microcosm experiments were conducted to identify the immediate effect of pyrene on soil bacterial communities. A freshly-collected pristine red soil was spiked with pyrene at 0, 10, 100, 200, and 500 mg·kg-1 and incubated for one day and seven days. The bacterial communities in the incubated soils were analyzed using 16S rRNA sequencing and terminal restriction fragment length polymorphism (T-RFLP) methods. The results revealed high bacterial diversity in both unspiked and pyrene-spiked soils. Only at the highest pyrene-spiking rate of 500 mg·kg-1, two minor bacteria groups of the identified 14 most abundant bacteria groups were completely suppressed. Short-term exposure to pyrene resulted in dominance of Proteobacteria in soil, followed by Acidobacteria, Firmutes, and Bacteroidetes. Our findings showed that bacterial community structure did respond to the presence of pyrene but recovered rapidly from the perturbation. The intensity of impact and the rate of recovery showed some pyrene dosage-dependent trends. Our results revealed that different levels of pyrene may affect the bacterial community structure by suppressing or selecting certain groups of bacteria. It was also found that the bacterial community was most susceptible to pyrene within one day of the chemical addition. 相似文献
1000.