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71.
Saeid Amiri Mohammad Jafari Jozani Reza Modarres 《Environmental and Ecological Statistics》2018,25(2):237-256
Rank-based sampling designs are powerful alternatives to simple random sampling (SRS) and often provide large improvements in the precision of estimators. In many environmental, ecological, agricultural, industrial and/or medical applications the interest lies in sampling designs that are cheaper than SRS and provide comparable estimates. In this paper, we propose a new variation of ranked set sampling (RSS) for estimating the population mean based on the random selection technique to measure a smaller number of observations than RSS design. We study the properties of the population mean estimator using the proposed design and provide conditions under which the mean estimator performs better than SRS and some existing rank-based sampling designs. Theoretical results are augmented with some numerical studies and a real-life example, where we also study the performance of our proposed design under perfect and imperfect ranking situations. 相似文献
72.
73.
Hadei Mostafa Mesdaghinia Alireza Nabizadeh Ramin Mahvi Amir Hossein Rabbani Shahram Naddafi Kazem 《Environmental science and pollution research international》2021,28(11):13055-13071
Environmental Science and Pollution Research - This study has systematically reviewed all of the research articles about the photocatalytic degradation of pesticides using titanium dioxide (TiO2)... 相似文献
74.
Amir González-Delgado Manoj K. Shukl David W. DuBois Juan P. Flores-Márgez Joel A. Hernández Escamill Evangelina Olivas 《环境科学学报(英文版)》2017,29(3):207-216
Particulate matter(PM) emissions from various sources can affect significantly human health and environmental quality especially in the Chihuahuan Desert region along US–Mexico border. The objective of this study was to use the low-cost sticky tape method to collect airborne PM for size characterization and identification of fungal spores. Sticky tape samplers were placed at 1.0 and 2.0 m above the ground surface at experimental sites in Ciudad Juárez, Mexico and at 0.6, 1.2 and 1.8 m at New Mexico sites, USA. Soil samples were collected in both countries to determine fungal diversity, texture and moisture content Dust particles collected from all of the experimental sites had a dominant texture of clay( 0.002 mm). The dominant textures identified from soil samples collected from the US and Mexican sites were loam and sandy clay loam, respectively. Alternaria, Penicillium and Fusarium were frequently found funguses in the US sites while Alternaria and Aspergillus were commonly observed in the Mexican sites. The sticky tapes also showed a similar diversity of fungal microorganisms present in the airborne PM at both Mexico and US sites Alternaria, Penicillium and Aspergillus were the three groups of airborne fungal microorganisms consistently present in the US and Mexican sites. The low-cost sticky tape method has the potential to be used for characterizing different airborne microorganisms and dust particles. 相似文献
75.
Henrietta Nittby Arne Brun Susanne Str?mblad Mehri Kaviani Moghadam Wenjun Sun Lars Malmgren Jacob Eberhardt Bertil R. Persson Leif G. Salford 《The Environmentalist》2011,31(2):140-148
Since the late 1980s, our group has examined the effects of radiofrequency electromagnetic fields (RF-EMF), including pulse-modulated waves of the type emitted by mobile phones, upon the blood?Cbrain barrier. In more than 2,000 rats, we have repeatedly demonstrated a passage of the rats?? own albumin from the blood through the brain capillaries into the surrounding brain parenchyma at SAR values down to 0.1mW/kg. In most of these experiments, the animals were exposed in TEM-cells, ventilated by an external electrical fan at 50 Hz. In the present study, we examined whether the extremely low frequency (ELF) magnetic fields from the fan (50 Hz, 0.3?C1.5 ??T) might add to the RF effect. Sixty-four rats were divided into 4 groups: RF only, ELF only and RF + ELF exposure plus a sham group. The GSM-900 MHz RF exposure was at the very low, nonthermal, average whole-body SAR level 0.4 mW/kg. Demonstration of the normally occurring albumin extravasation in the basal hypothalamus is our inbuilt control proving that the staining is reliable. Two full series of staining of the whole material gave negative results for hypothalamus. Not until we changed to avidin, biotin, and antibodies from a third supplier, we received an acceptable staining. Twenty-five percent of the RF animals had a pathological albumin leakage, while the ELF and RF + ELF groups with three and two pathological findings, respectively, were not significantly different from the control group. We conclude that the use of external fans has had no major influence upon the result. 相似文献
76.
Almerindo D. Ferreira Amir Farimani Antonio C. M. Sousa 《Environmental Fluid Mechanics》2011,11(2):167-181
Erosion is a common phenomenon in nature, and it may cause a wide range of problems such as air pollution, and destruction
of agricultural land, shelters and stockpiles. The present work deals with stockpiles, which have their profiles described
by a sinus function or by similar trigonometric functions. Analysis of the erosion by air flow over these piles will provide
for further understanding of the erosion underlying mechanisms and, moreover, how to control them and eventually to prevent
them. To this purpose, different experimental tests are conducted for a pile with a sinuous profile, and particular attention
is given to the time development of the profile due to the erosion process; the effect of the air velocity is also studied
by selecting different velocities. In addition, the flow over several deformed piles is numerically predicted using the CFX
software; the results clearly show the erosion process is strongly dependent upon time, velocity field and surface disturbances.
A correlation between the erosion rate and the velocity is proposed. 相似文献
77.
Investigation of the possible sources of heavy metal contamination in lagoon and canal water in the tannery industrial area in Dhaka, Bangladesh 总被引:2,自引:0,他引:2
78.
Mohammad Khandan Maryam Maghsoudipour Shahram Vosoughi Amir Kavousi 《International journal of occupational safety and ergonomics》2013,19(4):523-530
One of the most important ways to prevent accidents is to consider safety climate or culture. Moreover, some studies suggest that behavior contributes to 86%-96% of all injuries. This cross-sectional study took place in an Iranian petrochemical company in 2010. Vinodkumar and Bhasi’s safety climate questionnaire and an ergonomic behavior sampling checklist were the data collection tools. Cronbach’s a for questionnaire reliability was .928. With reference to the results of a pilot study, a sample of 1755 was determined for behavior sampling. We used principal component analysis (PCA) to derive the coefficient of paths in the path model and the Anderson-Rabin method to calculate factor scores. The results showed that safety climate was an effective predictor of ergonomic behavior (p < .01). They also showed the importance of decreasing the number of workers with negative safety climate. Moreover, it is necessary to promote workers’ ergonomic behaviors in the workplace. 相似文献
79.
80.
Israel Goldstein Amir Weissman Ronit Brill-Zamir Ilana Laevsky Arie Drugan 《黑龙江环境通报》2003,23(10):788-790
Ethmocephaly is a rare anomaly associated with partial failure of cleavage of the prosencephalon. Morphologically, it is closely related to cyclopia. We present an extremely rare case of ethmocephaly diagnosed in utero and caused by an unbalanced de novo translocation 18;21. Copyright © 2003 John Wiley & Sons, Ltd. 相似文献