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  • Singh, Ajay  (1,338)
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  • 1
    Language: English
    In: Journal of the American Chemical Society, 27 May 2015, Vol.137(20), pp.6464-7
    Description: The presence of antimony, as a dopant in the colloidal growth reaction for CuIn(1-x)Ga(x)S2 (CIGS) nanocrystals, causes end-to-end fusion of nanorod pairs into nanodumbbells at high yield. The influence of the dopant on shape is indirect; antimony catalyzes the incorporation of gallium, which is found in high concentration at the junction between the fused nanorods.
    Keywords: Copper Compounds – Chemical Properties ; Catalysis – Research ; Gallium – Chemical Properties;
    ISSN: 00027863
    E-ISSN: 1520-5126
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  • 2
    Language: English
    In: Journal of Hydrology, Jan 16, 2014, Vol.508, p.43(10)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jhydrol.2013.10.042 Byline: Ajay Singh Abstract: acents Various optimization techniques were analyzed for managing seawater intrusion. acents Maximizing pumping rate and minimizing saltwater intrusion were the main objectives. acents The GAs was used for attaining global optimal solution of intrusion problems. acents The ANNs were used as surrogate models. acents Combined uses of optimization and simulation models were preferred recently. Article History: Received 14 December 2012; Revised 3 July 2013; Accepted 25 October 2013 Article Note: (miscellaneous) This manuscript was handled by Laurent Charlet, Editor-in-Chief, with the assistance of Peter W. Swarzenski, Associate Editor
    Keywords: Seawater -- Analysis ; Seawater -- Models ; Saltwater Encroachment -- Analysis ; Saltwater Encroachment -- Models ; Optimization Theory -- Analysis ; Optimization Theory -- Models
    ISSN: 0022-1694
    Source: Cengage Learning, Inc.
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  • 3
    Language: English
    In: Journal of Hydrology, 2011, Vol.406(3), pp.245-255
    Description: ► Various alternatives are evaluated to mitigate the problem of waterlogging. ► Rice crop should be replaced by ‘sorghum’ to overcome the problem of waterlogging. ► The lining of canal irrigation systems is recommended to reduce seepage rates. ► The policies should be implemented in such a way that achieves long-term goals. Accurate estimation of the groundwater recharge is essential for efficient and sustainable groundwater management in arid and semi-arid regions, as water resources are critical to economic development in these areas. Various techniques are available to quantify recharge. The hydrological budget model proposed herein is unique, simple, and easy to apply. It uses data on groundwater level, groundwater extraction, and distributed specific yield information for estimating groundwater recharge. The Model is employed to estimate the seasonal long-term (35 years, e.g., from 1974 to 2009) groundwater recharge of an irrigated semi-arid area located in Haryana State of India, where groundwater levels are rising, continuously. The results are analysed to provide an overview of the process dynamics that led to imbalance of the system. Groundwater recharge analysis during the study period reveals that percolation from irrigated fields is the main recharge component with 49% contribution to the total recharge. An annual groundwater table rise of 0.14 m has been estimated for the study area. Various are evaluated to mitigate the problems of waterlogging and salinisation, considering the socio-economic issues which have wider policy significance on sustainability. Several suitable water management strategies such as reduction in rice area, increase in pumping volume and using the groundwater conjunctively with higher quality canal water, and lining of canal networks are suggested to bring the watertable down to a safe limit and to prevent further rising of the watertable. Among the potential solution alternatives studied, the one which considers 10% reduction in rice area along with 2% increase in pumping volume and 20% canal lining, yields best result for mitigating the waterlogging problems.
    Keywords: Groundwater Recharge ; Groundwater Management ; Waterlogging ; Water Balance ; Hydrologic Budget ; Geography
    ISSN: 0022-1694
    E-ISSN: 1879-2707
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  • 4
    Language: English
    In: Journal of Hydrology, Oct 12, 2012, Vol.466-467, p.167(16)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jhydrol.2012.08.004 Byline: Ajay Singh Keywords: Optimization modelling; Groundwater management; Irrigation management; Seawater intrusion; Conjunctive use planning; Optimal cropping pattern Abstract: a* A comprehensive review of various optimization techniques has been provided. a* Application of LP and DP techniques has been very popular in irrigation management. a* NLP has not been widely used because of rigorous mathematics involved. a* DP, MIP, DDP, CDDP, GA, and QP have extensively been used for groundwater management. a* Combined used of optimization and simulation models have been preferred recently. Author Affiliation: Agricultural and Food Engineering Department, Indian Institute of Technology, Kharagpur, West Bengal 721 302, India Article History: Received 7 June 2012; Revised 24 July 2012; Accepted 7 August 2012 Article Note: (miscellaneous) This manuscript was handled by Geoff Syme, Editor-in-Chief
    Keywords: Seawater -- Usage ; Seawater -- Models ; Water Resource Management -- Usage ; Water Resource Management -- Models ; Groundwater -- Usage ; Groundwater -- Models ; Optimization Theory -- Usage ; Optimization Theory -- Models
    ISSN: 0022-1694
    Source: Cengage Learning, Inc.
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  • 5
    Language: English
    In: Journal of Hydrology, Feb 25, 2013, Vol.481, p.220(10)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jhydrol.2012.12.042 Byline: Ajay Singh Keywords: Water resources management; Waterlogging; Sustainable agriculture; SGMP; Groundwater modelling; Water management alternatives Abstract: a* SGMP model is an effective tool for managing waterlogging in irrigated areas. a* Various alternatives were studied for mitigating the problem of waterlogging. a* Water distribution, management, and pricing policies should be reconsidered. a* Cropping pattern should be changed with reduced rice crop area. a* Canal water release should be governed as per water requirements of irrigated crops. Author Affiliation: Agricultural and Food Engineering Department, Indian Institute of Technology, Kharagpur, West Bengal 721 302, India Article History: Received 5 September 2012; Revised 23 December 2012; Accepted 27 December 2012 Article Note: (miscellaneous) This manuscript was handled by Geoff Syme, Editor-in-Chief, with the assistance of V. Ratna Reddy, Associate Editor
    Keywords: Water Resource Management -- Analysis ; Water Resources -- Analysis ; Groundwater -- Analysis
    ISSN: 0022-1694
    Source: Cengage Learning, Inc.
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  • 6
    Language: English
    In: Journal of the American Chemical Society, 29 May 2013, Vol.135(21), pp.7835-8
    Description: The formation of Cu2SnSe3 tetrapod nanocrystals is reported using a hot injection colloidal synthesis. The ternary copper chalcogenide nanocrystals nucleate with a cubic core with four short wurzite arms.
    Keywords: Copper Compounds -- Chemical Properties ; Copper Compounds -- Thermal Properties ; Crystal Structure -- Analysis ; Nucleation (Physics) -- Analysis ; Surface Energy -- Measurement;
    ISSN: 00027863
    E-ISSN: 1520-5126
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  • 7
    Language: English
    In: Journal of the American Chemical Society, 15 February 2012, Vol.134(6), pp.2910-3
    Description: The quaternary copper chalcogenide Cu(2)ZnSnS(4) is an important emerging material for the development of low-cost and sustainable solar cells. Here we report a facile solution synthesis of stoichiometric Cu(2)ZnSnS(4) in size-controlled nanorod form (11 nm × 35 nm). The monodisperse nanorods have a band gap of 1.43 eV and can be assembled into perpendicularly aligned arrays by controlled evaporation from solution.
    Keywords: Chemistry;
    ISSN: 00027863
    E-ISSN: 1520-5126
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  • 8
    Language: English
    In: The Science of the Total Environment, Nov 15, 2014, Vol.499, p.414(10)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.scitotenv.2014.05.048 Byline: Ajay Singh Abstract: The global population is increasing rapidly and expected to touch the 9.5 billion mark by 2050 from the current 7.2 billion. The management of the groundwater resources is a challenging task worldwide against the backdrop of the growing water demand for industrial, agricultural, and domestic uses and shrinking resources. Moreover, this task has been hampered significantly due to declining/rising groundwater levels and associated contamination. A broad range of solutions could be considered to address the aforementioned problems of groundwater management, but the effectiveness of all the solutions and their combinations cannot be verified with field experiments. Given their predictive capability, simulation models are often the only viable means of providing input to management decisions, as they can forecast the likely impacts of a particular water management strategy. This paper presents a comprehensive review on the simulation modeling applications for the management of groundwater resources. The past papers on the overview of groundwater simulation models, use of remote sensing and GIS in groundwater modeling, and application of simulation models in arid and semiarid regions are described in detail. Conclusions are drawn where gaps exist and more research needs to be focused. Article History: Received 11 January 2014; Revised 7 May 2014; Accepted 12 May 2014 Article Note: (miscellaneous) Editor: Carla M Koretsky
    Keywords: Water Resource Management -- Models ; Groundwater -- Models ; Computer Simulation -- Models
    ISSN: 0048-9697
    Source: Cengage Learning, Inc.
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  • 9
    In: Chemical Communications, 2013, Vol.49(87), pp.10293-10295
    Description: Homogenously alloyed CdSe x S 1 x nanorods with controlled aspect ratios are synthesised by a hot-injection colloidal route. The optical absorption and photoluminescence emission are compositionally tunable with chalcogen ratios. The synthetic protocol is sufficiently robust to allow good control of rod aspect ratios, with low polydispersities, suited for their rational assembly into superstructures.
    Keywords: Aspect Ratio ; Superstructures ; Colloids ; Nanorods ; Control Rods ; Assembly ; Emission ; Photoluminescence ; Processing Science (Wc) ; Miscellaneous Sciences (So) ; General and Nonclassified (MD) ; Components and Materials (General) (Ea);
    ISSN: 1359-7345
    E-ISSN: 1364-548X
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  • 10
    Language: English
    In: Journal of Hydrology, Nov 27, 2014, Vol.519, p.1688(10)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jhydrol.2014.09.049 Byline: Ajay Singh Abstract: * A review on issues and methods of conjunctive water use is provided. * Integrated simulation-optimization models are preferred for conjunctive use management. * Cyclic conjunctive water application has an edge over the blending use. * Salinity buildup in the root zone is a major disadvantage of conjunctive water use. Article History: Received 18 May 2014; Revised 10 September 2014; Accepted 18 September 2014 Article Note: (miscellaneous) This manuscript was handled by Geoff Syme, Editor-in-Chief, with the assistance of John W. Nicklow, Associate Editor
    Keywords: Water Resources -- Analysis ; Water Resources -- Usage ; Water Use -- Analysis ; Water Use -- Usage ; Sustainable Agriculture -- Analysis ; Sustainable Agriculture -- Usage
    ISSN: 0022-1694
    Source: Cengage Learning, Inc.
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