排序方式: 共有28条查询结果,搜索用时 15 毫秒
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Ozis F Singh M Devinny J Sioutas C 《Journal of the Air & Waste Management Association (1995)》2004,54(8):935-940
The removal efficiency of granular filters packed with lava rock and sand was studied for collection of airborne particles 0.05-2.5 microm in diameter. The effects of filter depth, packing wetness, grain size, and flow rate on collection efficiency were investigated. Two packing grain sizes (0.3 and 0.15 cm) were tested for flow rates of 1.2, 2.4, and 3.6 L/min, corresponding to empty bed residence times (equal to the bulk volume of the packing divided by the airflow rate) in the granular media of 60, 30, and 20 sec, respectively. The results showed that at 1.2 L/min, dry packing with grains 0.15 cm in diameter removed more than 80% (by number) of the particles. Particle collection efficiency decreased with increasing flow rate. Diffusion was identified as the predominant collection mechanism for ultrafine particles, while the larger particles in the accumulation mode of 0.7-2.5 microm were removed primarily by gravitational settling. For all packing depths and airflow rates, particle removal efficiency was generally higher on dry packing than on wet packing for particles smaller than 0.25 microm. The results suggest that development of biological filters for fine particles is possible. 相似文献
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This study proposed and examined determinants of organizational commitment in working women. Among the selected determinants of role stress, personal characteristics, and satisfaction with various aspects of the organization, satisfaction with promotional opportunities was die best predictor of commitment. Experienced role stress was the second best determinant, although the observed relationship was inverse. Other variables such as age, education, and need for achievement, found to be antecedents of organizational commitment in earlier empirical studies, failed to predict commitment in this heterogeneous sample of working women. Findings were discussed in terms of the implications for further research and theory development in the area of organizational commitment as well as for the integration of women into modern work organizations. 相似文献
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Malhotra Manisha Suman Sunil Kumar 《Environmental science and pollution research international》2021,28(42):58929-58944
Environmental Science and Pollution Research - The rising global population and worldwide industrialization have led to unprecedented energy demand that is causing fast depletion of fossil... 相似文献
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Singh PP Mall M Singh J 《Journal of environmental biology / Academy of Environmental Biology, India》2006,27(1):153-156
In the present study effect of fertilizer factory effluent on seed germination, seedling growth and chlorophyll content of gram (Cicer aeritenum) has been carried out, at different concentration of the effluent and time intervals. The effluent is alkaline in nature with strong ammonia odour. The germination percentage of seed, seedling growth and chlorophyll content showed a gradual decline with increase in effluent concentration. At 25% concentration of the effluent, growth promotion in terms of root, shoot length and increase in chlorophyll content recorded at 21 days. However, at higher concentrations of the effluent toxic effects were observed at 21 days. The study suggests that the effluent can be used safely for Cicer aeritenum cultivation, only after proper treatment and dilution. 相似文献
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Mohanty Trupti Rani Tiwari Nitish Kumar Kumari Suman Ray Archisman Manna Ranjan Kumar Bayen Supriti Roy Shreya Das Gupta Subhadeep Ramteke Mitesh Hiradas Swain Himanshu Sekhar Bhor Manisha Das Basanta Kumar 《Environmental science and pollution research international》2022,29(25):37498-37512
Environmental Science and Pollution Research - Aulacoseira granulata (Ehrenberg) Simonsen 1979 are considered as the eco-variable species which varies in density and diversity along with their... 相似文献
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Antil Monika Singh Surinder Bhagat Mamta Vilvas Vishal Sundaramurthy Suresh 《Environmental science and pollution research international》2022,29(48):72279-72293
Environmental Science and Pollution Research - The objective of this study deals with column optimization of adsorption-based on removal of arsenite ion using rice husk. The parameters affecting... 相似文献