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A geospatial investigation of interlinkage between basement fault architecture and coastal aquifer hydrogeochemistry

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Geoscience Frontiers 2020年第4期11卷 1431-1440页

作者： p.p.Das p.p.Mohapatra S.Goswami M.Mishra J.K.pattanaik ACOAST Amity University HarayanaGurugramIndia Department of Geology North Odisha UniversityOdishaIndia Department of Earth Sciences Sambalpur UniversitySamabalpurOdishaIndia Khallikote University BerhampurOdishaIndia Centre for Geography and Geology Central University of PunjabBhatindaIndia

The Mahanadi delta,deposited on a series of horst and graben basement structures,is considered an extension of the East Lambert Rift of *** study is based on the hydrogeochemical assessment of this deltaic aquifer system and geospatial analysis thereof,to appreciate the basement structure influence on groundwater *** ion chemistry of subsurface waters portrays a distinct saline contamination across the terrain and varied regimes of water types,specifically with respect to southern and northern parts of this aquifer *** of the study indicate a general near surface saline horizon and significant fragmentation of the hydrostatic ***,in turn,implies noteworthy influence of formational water to salinity regimes and basin structural changes for the escape of these waters to surroundings.A plot of recent low intensity earthquakes displays proximity of epicenters to the faults as well as striking similarity to the trend of terrestrial faults indicating multiple reactivations of the *** further corroborate the above findings,spatial pattern analysis of individual hydrochemical variables is carried out which reveals specific clusters of sources(groundwater mixing)and sinks(groundwater dispersion) in proximity to basement fault *** the faults can be disregarded as conduits or barriers owing to their great depth,the overlying sedimentary mass,particularly,the horizons with significant clayey content have been distorted due to post rift subsidence and fault reactivations.A proximity analysis of ionic clusters points towards a greater influence of longitudinal faults to that of the transverse ones on groundwater mixing or dispersion.

关键词： Hydrogeochemistry Mahanadi Geospatial Salinity Cluster analysis

Influence of Metal Oxides on the Arc Erosion Behaviour of Silver Metal Oxides Electrical Contact Materials

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Journal of Materials Science & Technology 2004年第1期20卷 49-52页

作者： p.Verma O.p.pandey A.Verma School of physics and Material Science Thapar Institute of Engineering and Technology Patiala-147004 IndiaSchool of Physics and Material Science Thapar Institute of Engineering and Technology Patiala-147004 IndiaMaterials Science and Technology Division Thapar Centre for Industrial Research and Development Patiala-147004 India

In the present work investigations have been made to see the role of metal oxides on the performance of the silver metal oxides electrical contact materials. Silver metal oxide materials of three different compositions Ag-10CdO, Ag-7.6SnO2-2.3ln2O3 and Ag-10ZnO were prepared by internal oxidation process under identical processing conditions. These materials were tested for electrical conductivity, hardness, and erosion loss. performing an accelerated test on the actual contactor assessed the electrical performance, involving erosion loss and temperature rise of the processed materials. The arc-eroded surface was characterized under scanning electron microscope. The study of the eroded surfaces of contacts indicates that the thermal stability of metal oxides depends on nature of silver-metal oxide interface and their mode of erosion. An attempt is made to correlate the surface features of the eroded contacts with the thermal stability of metal oxides.

关键词： Contact material Microstructure Erosion rate

Identification of the active sites and mechanism for partial methane oxidation to methanol over copper-exchanged CHA zeolites

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Science China Chemistry 2020年第6期63卷 850-859页

作者： Yu Mao p.Hu School of Chemistry and Chemical Engineering The Queen’s University of BelfastBelfastUK

To make methane a suitable energy carrier and transport less costly,it is an urgent and challenging task for us to convert methane to liquid under mild conditions *** this study,we explored partial methane oxidation to methanol by density functional theory(DFT)calculations using a hybrid functional(HSE06)with van der Waals(vdW)*** stabilities of different active sites over SSZ-13 and SApO-34,two CHA type zeolites,are thoroughly investigated by ab initio molecular dynamics(AIMD)simulations and ab initio thermodynamics *** possible active sites,namely[CuOHCu]2+,[Cu(OH)2Cu]2+,[CuOCu]2+and[CuOH]+,are identified ***-to-methanol reaction mechanisms are further studied upon these most stable active sites,among which[CuOCu]2+and[CuOH]+are proved to be *** migration of species among zeolite pores are also discussed,which accounts for the activity on[CuOH]+*** concept may represent a more complete picture of catalytic reactions over zeolites in general.

关键词： DFT heterogeneous catalysis methane-to-methanol CHA zeolites

Elastic field near the tip of an anticrack in a decagonal quasicrystalline material

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Applied Mathematics and Mechanics(English Edition) 2020年第3期41卷 401-408页

作者： Xu WANG p.SCHIAVONE School of Mechanical and power Engineering East China University of Science and TechnologyShanghai 200237China Department of Mechanical Engineering 10-203 Donadeo Innovation Centre for EngineeringUniversity of AlbertaEdmontonAlberta T6G 1H9Canada

We investigate the elastic field near the tip of an anticrack in a homogeneous decagonal quasicrystalline material subject to plane strain deformations. The phonon and phason stresses exhibit a square root singularity at the anticrack tip. Two realvalued phonon stress intensity factors and two real-valued phason stress intensity factors are introduced to scale four separate modes of deformation. We obtain four analytic functions which completely characterize the induced phonon and phason stresses as well as the displacement field. In particular, we derive a concise yet elegant representation of the anticrack contraction force.

关键词： decagonal quasicrystal anticrack elastic field anticrack contraction force analytic continuation

Utilization of alkali-activated copper slag as binder in concrete

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Frontiers of Structural and Civil Engineering 2021年第3期15卷 773-780页

作者： Jagmeet SINGH S p SINGH Department of Civil Engineering Dr.B R Ambedkar National Institute of TechnologyJalandhar144011India

This study was focused on developing concrete using alkali-activated copper slag(AACS)as a *** properties of alkali-activated copper slag concrete(AACSC)were compared with portland cement concrete(pCC).Different AACSC mixes were prepared with varying Na_(2)O dosage(6%and 8%of the binder by weight)and curing *** products in AACSC were retrieved using Fourier-transform infrared spectroscopy(FTIR)and X-ray powder diffraction(XRD)*** test results indicate that the workability of AACSC was lesser than that of *** AACSC mix with 6%Na_(2)O dosage has exhibited similar mechanical properties as that of *** mechanical properties of AACSC were higher than pCC when 8%of Na_(2)O dosage was *** curing was effective to upgrade the strength properties of AACSC at an early age of curing,but at a later age mechanical properties of ambient cured and heat-cured AACSC were *** hydration products of AACSC were not identified in XRD patterns,whereas,in FTIR spectra of AACSC some alkali-activated reaction products were *** AACSC mixes were found to be more sustainable than *** has been concluded that AACSC can be produced similarly to that of pCC and ambient curing is sufficient.

关键词： binder concrete mechanical properties mineralogy workability

Thermoelectric field for a coated hole of arbitrary shape in a nonlinearly coupled thermoelectric material

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Applied Mathematics and Mechanics(English Edition) 2022年第11期43卷 1691-1700页

作者： Xu WANG p.SCHIAVONE School of Mechanical and power Engineering East China University of Science and TechnologyShanghai 200237China Department of Mechanical Engineering University of Alberta10-203 Donadeo Innovation Center for EngineeringEdmonton T6G 1H9Canada

We study the thermoelectric field for an electrically and thermally insulated coated hole of arbitrary shape embedded in an infinite nonlinearly coupled thermoelectric material subject to uniform remote electric current density and uniform remote energy flux.A conformal mapping function for the coating and matrix is introduced,which simultaneously maps the hole boundary and the coating-matrix interface onto two concentric circles in the image *** analytic continuation,we derive a general solution in terms of two auxiliary *** general solution satisfies the insulating conditions along the hole boundary and all of the continuity conditions across the perfect coating-matrix *** the two auxiliary functions have been obtained in the elementary-form,the four original analytic functions in the coating and matrix characterizing the thermoelectric fields are completely and explicitly *** design of a neutral coated circular hole that does not disturb the prescribed thermoelectric field in the thermoelectric matrix is achieved when the relative thickness parameter and the two mismatch parameters satisfy a simple ***,the neutrality of a coated circular thermoelectric inhomogeneity is also accomplished.

关键词： thermoelectric material nonlinear coupling coated hole of arbitrary shape complex variable method analytic solution neutral coated hole

Coastal upwelling off the southwest coast of India:observations and simulations

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International Journal of Digital Earth 2016年第12期9卷 1256-1274页

作者： p.V.Hareesh Kumar p.Anand Naval physical and Oceanographic Laboratory KochiKeralaIndia

Spatial hydrographic data collected from August 2007 through May 2008 and the princeton Ocean Model(pOM)are utilized to explain and document the upwelling in the south eastern Arabian Sea(SEAS).The decrease in the magnitude of winds towards the coast favors local anticyclonic vorticity,resulting in the formation of cyclonic eddy and reversal of coastal *** Ekman transport due to alongshore winds,Ekman pumping due to wind stress curl,cyclonic eddy and southward West Indian Coastal Currents play different roles in the SEAS *** the offshore,wind stress curl leads to the formation of meso-scale eddies,resulting in Ekman pumping at the center and consequent *** rapid depth variation on the western side of Quilon Mount intensifies upwelling in the *** upwelling Kelvin waves generated at the equator terminates in the Bay of Bengal and do not contribute to the SEAS *** possible role of local and remote winds,especially around Sri Lanka on the upwelling dynamics of SEAS is described utilizing *** Kelvin waves generated off the coast of Sri Lanka during the active phase of the summer monsoon also contribute to the upwelling dynamics off the west coast of India.

关键词： Southeastern Arabian Sea coastal upwelling Upwelling Kelvin wave West Indian coastal currents 3-D circulation model

Existence of Solutions to a Singular Initial Value problem

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Acta Mathematica Sinica,English Series 2007年第10期23卷 1797-1806页

作者： R.p.AGARWAL p.S.KELEVEDJIEV Department of Mathematical Sciences Florida Institute of TechnologyMelbourneFlorida 32901USA Department of Mathematics Technical University of SlivenSlivenBulgaria

Under the sign assumptions we investigate the global existence of solutions of the initial value problem x＇ =f（t, x, x＇）, x（0） = A, where the scalar function f（t, x,p） may be singular at x = A.

关键词： initial value problems first order differential equations singularity existence global solutions

Short Term Wind Speed prediction Using Multiple Kernel pseudo Inverse Neural Network

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International Journal of Automation and computing 2018年第1期15卷 66-83页

作者： S.p.Mishra p.K.Dash Multi-disciplinary Research Centre (MDRC) Department of Electrical EngineeringSiksha "O" Anusandhan University

An accurate short-term wind speed prediction algorithm based on the efficient kernel ridge pseudo inverse neural network （KRpINN） variants is proposed in this paper. The use of nonlinear kernel functions in pseudo inverse neural networks eliminates the trial and error approach of choosing the number of hidden layer neurons and their activation functions. The robustness of the proposed method has been validated in comparison with other models such as pseudo inverse radial basis function （pIRBF） and Legendre tanh activation function based neural network, i.e., pILNNT, whose input weights to the hidden layer weights are optimized using an adaptive firefly algorithm, i.e., FFA. However, since the individual kernel functions based KRpINN may not be able to produce accurate forecasts under chaotically varying wind speed conditions, a linear combination of individual kernel functions is used to build the multi kernel ridge pseudo inverse neural network （MK-RpINN） for providing improved forecasting accuracy, generalization, and stability of the wind speed prediction model. Several case studies have been presented to validate the accuracy of the short-term wind speed prediction models using the real world wind speed data from a wind farm in the Wyoming State of USA over time horizons varying from 10 minutes to 5 hours.

关键词： Wind speed prediction pseudo inverse neural network kernel ridge regression nonlinear kernels firefly optimizatiotl.