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111.
Vijay P. Singh 《Journal of the American Water Resources Association》1975,11(6):1091-1102
ABSTRACT: This study presents analytic and graphical techniques for estimation and optimization of kinematic wave parameters. Because the techniques are derived from the kinematic wave theory, the optimized parameter values will have minimum bias in them. 相似文献
112.
Vijay P. Singh Somkid Buapeng 《Journal of the American Water Resources Association》1977,13(3):499-514
ABSTRACT: Four methods of determining rainfall-excess are considered. They include Ø-index and equations of Horton, Kostyakov and Philip. These methods are utilized in a nonlinear kinematic wave model to predict surface runoff from two natural agricultural watersheds. The effect of determining rainfall-excess on surface runoff response is then examined. It is observed that errors in rainfall-excess constitute a major source of error in runoff prediction. The choice of a method of determining rainfall-excess is thus crucial to runoff computation. 相似文献
113.
K.P. Sudheer Indrajeet Chaubey Vijay Garg 《Journal of the American Water Resources Association》2006,42(6):1683-1695
Abstract: The concern about water quality in inland water bodies such as lakes and reservoirs has been increasing. Owing to the complexity associated with field collection of water quality samples and subsequent laboratory analyses, scientists and researchers have employed remote sensing techniques for water quality information retrieval. Due to the limitations of linear regression methods, many researchers have employed the artificial neural network (ANN) technique to decorrelate satellite data in order to assess water quality. In this paper, we propose a method that establishes the output sensitivity toward changes in the individual input reflectance channels while modeling water quality from remote sensing data collected by Landsat thematic mapper (TM). From the sensitivity, a hypothesis about the importance of each band can be made and used as a guideline to select appropriate input variables (band combination) for ANN models based on the principle of parsimony for water quality retrieval. The approach is illustrated through a case study of Beaver Reservoir in Arkansas, USA. The results of the case study are highly promising and validate the input selection procedure outlined in this paper. The results indicate that this approach could significantly reduce the effort and computational time required to develop an ANN water quality model. 相似文献
114.
Vijay P. Singh Kulwant Singh 《Journal of the American Water Resources Association》1987,23(6):1185-1189
ABSTRACT: The principle of maximum entropy (POME) was used to derive an alternative method for parameter estimation for the three parameter lognormal (TPLN) distribution. Six sets of annual peak discharge data were used to evaluate this method and compare it with the methods of moments and maximum likelihood estimation. 相似文献
115.
Gaidukovs Sergejs Platnieks Oskars Gaidukova Gerda Starkova Olesja Barkane Anda Beluns Sergejs Thakur Vijay Kumar 《Journal of Polymers and the Environment》2022,30(4):1435-1450
Journal of Polymers and the Environment - The transition from fossil-based to bio-based materials requires in-depth environmental durability analysis for material engineering and construction... 相似文献
116.
Pradeep Kumar Ekta Faujdar Raj K. Singh Subham Paul Aruna Kukrety Vijay K. Chhibber Siddharth S. Ray 《Environmental Chemistry Letters》2018,16(3):1025-1031
CO2 absorption by liquid-containing amines to form carbamate and bicarbonates is an effective method of CO2 mitigation from industrial exhausts, but this process is expensive and requires large quantities of amines. Here we modified chitosan, a naturally occurring biopolymer containing NH2 functions, to use it for CO2 absorption in aqueous media. Chitosan was dispersed in 40% aqueous NaOH solution then treated with monochloroacetic acid dissolved in isopropanol, to yield O-carboxymethylchitosan. Results show that the CO2 absorption capacity of O-carboxymethylchitosan is 0.508 g/g, which is higher than the capacity of conventional amines such as 1-aminoamine, 2-methylpropanolamine and methyldiethanol amine, but lower than the capacity of monoethanolamine. A cyclic study showed that O-carboxymethylchitosan is a stable component for CO2 absorption and regeneration. 相似文献
117.
118.
Toxicity,degradation and analysis of the herbicide atrazine 总被引:3,自引:0,他引:3
Simranjeet Singh Vijay Kumar Arun Chauhan Shivika Datta Abdul Basit Wani Nasib Singh Joginder Singh 《Environmental Chemistry Letters》2018,16(1):211-237
Excessive use of pesticides and herbicides is a major environmental and health concern worldwide. Atrazine, a synthetic triazine herbicide commonly used to control grassy and broadleaf weeds in crops, is a major pollutant of soil and water ecosystems. Atrazine modifies the growth, enzymatic processes and photosynthesis in plants. Atrazine exerts mutagenicity, genotoxicity, defective cell division, erroneous lipid synthesis and hormonal imbalance in aquatic fauna and nontarget animals. It has threatened the sustainability of agricultural soils due to detrimental effects on resident soil microbial communities. The detection of atrazine in soil and reservoir sites is usually made by IR spectroscopy, ELISA, HPLC, UPLC, LC–MS and GC–MS techniques. HPLC/LC–MS and GC–MS techniques are considered the most effective tools, having detection limits up to ppb levels in different matrices. Biodegradation of atrazine by microbial species is increasingly being recognized as an eco-friendly, economically feasible and sustainable bioremediation strategy. This review presents the toxicity, analytical techniques, abiotic degradation and microbial metabolism of atrazine. 相似文献
119.
Prakash Anand Palkar Ritesh Ramesh 《Environmental science and pollution research international》2023,30(10):24804-24814
Environmental Science and Pollution Research - This paper deals with the techniques to use plastic waste for co-processing in cement kiln for energy recovery. Plastics, a versatile material and... 相似文献
120.
Grewal Jyotika Kumar Vijay Rawat Hemant Gandhi Yashika Singh Ravindra Singh Arjun Babu Gajji Srikanth Narayanam Mishra Sujeet K. 《Environmental Chemistry Letters》2022,20(4):2487-2507
Environmental Chemistry Letters - Cancer is one of the most fatal diseases causing deaths of millions of people worldwide. Since actual cancer treatments are rarely efficient and often toxic, there... 相似文献