排序方式: 共有24条查询结果,搜索用时 15 毫秒
11.
Hashmi Shujahat Haider Fan Hongzhong Fareed Zeeshan Shahzad Farrukh 《Environmental science and pollution research international》2021,28(11):13404-13424
Environmental Science and Pollution Research - The rapid urbanization growth has not only improved the living standards of people but also raised concerns for environmental sustainability over the... 相似文献
12.
Zeeshan Jave Cheng Liu Muhammad Fahim Khokhar Chengzhi Xing Wei Tan Muhammad Ahmed Subhani Abdul Rehman Aimon Tanvir 《环境科学学报(英文版)》2019,31(6):296-305
This study presents the Multi Axis Differential Optical Absorption Spectroscopy(MAXDOAS) measurements for Glyoxal(CHOCHO) in Beijing, China(39.95°N, 116.32°E). CHOCHO is the smallest compound of di-carbonyl group. As a primary sink of CHOCHO, its photolysis with NOx(oxides of nitrogen) results in the production of tropospheric ozone. Therefore,the focus of CHOCHO DOAS measurements is increasing in trend. We did the measurements from 09 May 2017 to 09 September 2017. The study was conducted to compare different retrieval settings in order to reveal best DOAS fit settings for CHOCHO;furthermore, effect of haze and non-haze days on CHOCHO concentration was examined.The root mean square of residual and Differential Slant Column density(dSCD) error was reduced when measurements were done with lower wavelength limit around 432–438 nm and upper intervals around 455–460 nm. Thus, lower wavelength intervals around432–438 nm and upper intervals around 457–460 nm were best for the retrieval of dSCDs for CHOCHO. Meteorological conditions like haze or non-haze days did not have significant effect on DOAS fit parameters. The CHOCHO vertical column densities range from 1.33 E +14 to 9.77 E + 14 molecules/cm2 during the study period with average of 6.16 E +14 molecules/cm2. The results indicated that during haze days CHOCHO concentration was higher because of lower rate of photolysis and atmospheric oxidation potential. Our results did not show any significant weekend effect on CHOCHO atmospheric concentration. 相似文献
13.
Ishfaq Ahmed Muhammad Zeeshan Shaukat Ahmad Usman Muhammad Musarrat Nawaz Mian Sajid Nazir 《International journal of occupational safety and ergonomics》2018,24(2):240-250
This research covers the current status of occupational health and safety (OHS)-related practices in the informal construction segment of Pakistan. Data were collected, through interviews, from 316 construction sites employing 3577 workers. The results of the study reveal that both employers and workers lack knowledge of OHS laws/standards and no practices of this nature are enacted at these construction sites. Alarmingly, work-related accidents, whenever they happen, are not given due attention and there is no formal injury-report system. The informal construction industry employs a huge portion of the informal workforce, and lack of OHS happens at tremendous human cost. These research findings may thus play their role in strengthening the case for reforms in the sector. This study, if properly utilized, may also enable employers of the sector by increasing their knowledge about OHS practices and, as a result, trying to offer safer environments for their workers. 相似文献
14.
Butt Muhammad Qasim Zeeshan Nadia Ashraf Naeem Mahmood Akhtar Muhammad Aftab Ashraf Hina Afroz Amber Shaheen Aqsa Naz Shumaila 《Environmental science and pollution research international》2021,28(39):54842-54851
Environmental Science and Pollution Research - Massive discharge of wastes produced by the processing of leather so far confers the most important environmental challenge facing the tanneries... 相似文献
15.
Hameed Irfan Hyder Zeeshan Imran Muhammad Shafiq Kashif 《Environment, Development and Sustainability》2021,23(9):13113-13134
Environment, Development and Sustainability - Consumers’ interest is accelerating toward environmentally sustainable products, which are commonly known as green products. Companies use... 相似文献
16.
Mohamad Fared Murshe Zeeshan Aslam Rosmala Lewis Christopher Chow Dongsheng Wang Mary Drikas John van Leeuwen 《环境科学学报(英文版)》2014,26(10):1985-1993
The treatment of organics present in the lower reaches of a major river system(the Murray–Darling Basin, Australia) before(March–July 2010), during(December 2010–May 2011) and after(April–December 2012) a major flood period was investigated. The flood period(over 6 months)occurred during an intense La Nia cycle, leading to rapid and high increases in river flows and organic loads in the river water. Dissolved organic carbon(DOC) increased(2–3 times) to high concentrations(up to 16 mg/L) and was found to correlate with river flow rates. The treatability of organics was studied using conventional jar tests with alum and an enhanced coagulation model(mEnCo). Predicted mean alum dose rates(per mg DOC) were higher before(9.1 mg alum/mg DOC) and after(8.5 mg alum/mg DOC) than during the flood event(8.0 mg alum/mg DOC),indicating differences in the character of the organics in raw waters. To assess the character of natural organic matter present in raw and treated waters, high performance size exclusion chromatography with UV and fluorescence detectors were used. During the flood period, high molecular weight UV absorbing compounds(〉2 kDa) were mostly detected in waters collected,but were not evident in waters collected before and afterwards. The relative abundances of humic-like and protein-like compounds during and following the flood period were also investigated and found to be of a higher molecular weight during the flood period. The treatability of the organics was found to vary over the three climate conditions investigated. 相似文献
17.
Malik Muhammad Zeeshan Baloch Mazhar Hussain Gul Mehr Kaloi Ghulam Sarwar Chauhdary Sohaib Tahir Memon Ali Asghar 《Environmental science and pollution research international》2021,28(5):5020-5035
Environmental Science and Pollution Research - In the last few decades, wind energy has become a significant source of the renewable energy system, and it is essential to use wind energy for... 相似文献
18.
Baig Imran Ali Chandio Abbas Ali Ozturk Ilhan Kumar Pushp Khan Zeeshan Anis Salam Md.Abdus 《Environmental science and pollution research international》2022,29(23):34209-34230
Environmental Science and Pollution Research - In recent years, environmental change has arisen as a ubiquitous problem and gained environmentalist’s attention across the globe due to its... 相似文献
19.
Xiangguang Ji Cheng Liu Zhouqing Xie Qihou Hu Yunsheng Dong Guangqiang Fan Tianshu Zhang Chengzhi Xing Zhuang Wang Zeeshan Jave Jianguo Liu 《环境科学学报(英文版)》2019,31(5):81-90
Beijing–Tianjin–Hebei area is suffering from atmospheric pollution from a long time. The understanding of the air pollution mechanism is of great importance for officials to design strategies for the environmental governance. Mixing layer height(MLH) is a key factor influencing the diffusion of air pollutants. It plays an important role on the evolution of heavy pollution events. Light detection and ranging(lidar), is an effective remote-sensing tool, which can retrieve high spatial and temporal evolution process within mixing layer(ML), especially the variation of MLH. There are many methods to retrieve MLH, but each method has its own applicable limitations. The Mie-lidar data in Beijing was firstly used to compare three different algorithms which are widely used under different pollution levels.We find that the multi-layer structure near surface may cause errors in the detection of mixing layer. The MLH retrieved based on image edge detection was better than another two methods especially under heavy polluted episode. Then we applied this method to investigate the evolution of the mixing layer height during a pollution episode in December2016. MLH at Gucheng county showed the positive correlation with the concentration of particulate matters during the start of this pollution episode. The elevated pollution level in Gucheng was not associated with MLH's decrease, and the significantly increased particulate matters raised the boundary layer, which trapped the pollutants near the surface. 相似文献
20.