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Inclusion of CoTiO_(3) to ameliorate the re/dehydrogenation properties of the mg–na–Al system

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Journal of magnesium and Alloys 2024年第3期12卷 1215-1226页

作者： n.A.Ali n.Y.Yusnizam n.A.Sazelee Sami-ullah Rather Haizhen Liu m.Ismail Energy Storage Research Group Faculty of Ocean Engineering TechnologyUniversiti Malaysia Terengganu21030 Kuala NerusTerengganuMalaysia Department of Chemical and materials Engineering King Abdulaziz UniversityP.O.Box80204Jeddah 21589Saudi Arabia Guangxi novel Battery materials Research Center of Engineering Technology School of Physical Science and TechnologyGuangxi UniversityNanning 530004China State Key Laboratory of Featured metal materials and Life-Cycle Safety for Composite Structures Nanning 530004China

For the first time,the mgH_(2)–naAlH_(4)(ratio 4:1)destabilized system with CoTiO_(3) addition has been *** CoTiO_(3)-doped mgH_(2)–naAlH_(4) sample begins to dehydrogenate at 130℃,which is declined by 40℃ compared to the undoped mgH_(2)–naAlH_(4).moreover,the de/rehydrogenation kinetics characteristics of the CoTiO_(3)-doped mgH_(2)–naAlH_(4) were greatly *** the inclusion of CoTiO_(3),the mgH_(2)–naAlH_(4) composite absorbed 5.2 wt.%H_(2),higher than undoped mgH_(2)–naAlH_(4).In the context of dehydrogenation,the CoTiO_(3)-doped mgH_(2)–naAlH_(4) sample desorbed 2.6 wt.%H_(2),almost doubled compared to the amount of hydrogen desorbed from the undoped mgH_(2)–naAlH_(4) *** activation energy obtained by the Kissinger analysis for mgH_(2) decomposition was significantly lower by 35.9 kJ/mol than the undoped mgH_(2)–naAlH_(4) *** reaction mechanism demonstrated that new phases of mgCo and AlTi_(3) were generated in situ during the heating process and are likely to play a substantial catalytic function and be useful in ameliorating the de/rehydrogenation properties of the destabilized mgH_(2)–naAlH_(4) system with the inclusion of CoTiO_(3).

关键词： Destabilize system magnesium hydride Sodium alanate Hydrogen storage Additive.

Optimization of Gas Sensing Performance of nanocrystalline SnO_2 Thin Films Synthesized by magnetron Sputtering

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Chinese Physics Letters 2016年第6期33卷 99-103页

作者： n.Panahi m.T.Hosseinnejad m.Shirazi m.Ghoranneviss Department of Physics Bandar Abbas BranchIslamic Azad University Young Researchers and Elite Club Science and Research BranchIslamic Azad University Plasma Physics Research Center Science and Research BranchIslamic Azad University

Tin oxide （SnO2） is one of the most promising transparent conducting oxide materials, which is widely used in thin film gas sensors. We investigate the dependence of the deposition time on structural, morphologicaJ and hydrogen gas sensing properties of SnO2 thin films synthesized by dc magnetron sputtering. The deposited samples are characterized by XRD, SEm, AFm, surface area measurements and surface profiler. Also the H2 gas sensing properties of SnO2 deposited samples are performed against a wide range of operating temperature. The XRD analysis demonstrates that the degree of crystallinity of the deposited SnO2 films strongly depends on the deposition time. SEm and AFm analyses reveal that the size of nanoparticles or agglomerates, and both average and rms surface roughness is enhanced with the increasing deposition time. Also gas sensors based on these SnO2 nanolayers show an acceptable response to hydrogen at various operating temperatures.

关键词： of on as it or in Optimization of Gas Sensing Performance of nanocrystalline SnO2 Thin Films Synthesized by magnetron Sputtering SnO by

new methods for processing and interpreting marine magnetic anomalies:Application to structure,oil and gas exploration,Kuril forearc,Barents and Caspian seas

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Geoscience Frontiers 2013年第1期4卷 73-85页

作者： A.m.Gorodnitskiy Yu.V.Brusilovskiy A.n.Ivanenko A.m.Filin n.A.Shishkina Shirshov Institute of Oceanology MoscowRussia

new methods are presented for processing and interpretation of shallow marine differential magnetic data, including constructing maps of offshore total magnetic anomalies with an extremely high reso- lution of up to 1-2 nT, mapping weak anomalies of 5-10 nT caused by mineralization effects at the contacts of hydrocarbons with host rocks, estimating depths to upper and lower boundaries of anom- alous magnetic sources, and estimating thickness of magnetic layers and boundaries of tectonic blocks. Horizontal dimensions of tectonic blocks in the so-called ＂seismic gap＂ region in the central Kuril Arc vary from 10 to 100 km, with typical dimensions of 25-30 km. The area of the ＂seismic gap＂ is a zone of intense tectonic activity and recent volcanism. Deep sources causing magnetic anomalies in the area are similar to the ＂magnetic belt＂ near Hokkaido. In the southern and central parts of Barents Sea, tectonic blocks with widths of 30-100 kin, and upper and lower boundaries of magnetic layers ranging from depths of 10 to 5 km and 18 to 30 km are calculated. models of the magnetic layer underlying the mezen Basin in an inland part of the White Sea-Barents Sea paleorift indicate depths to the lower boundary of the layer of 12-30 km. Weak local magnetic anomalies of 2-5 nT in the northern and central Caspian Sea were identified using the new methods, and drilling confirms that the anomalies are related to concentrations of hydrocarbon. Two layers causing magnetic anomalies are identified in the northern Caspian Sea from magnetic anomaly spectra. The upper layer lies immediately beneath the sea bottom and the lower layer occurs at depths between 30-40 m and 150-200 m.

关键词： Geophysical survey magnetic data processing Hydrocarbon prospecting Kuril Arc Barents Sea Caspian Sea

numerical solutions for cracks in an elastic half-plane

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Acta mechanica Sinica 2019年第1期35卷 212-227,I0006页

作者： n.R.F.Elfakhakhre n.m.A.nik Long Z.K.Eshkuvatov mathematics Department Faculty of ScienceUniversiti Putra Malaysia43400 SerdangSelangorMalaysia Institute for mathematical Research Universiti Putra Malaysia43400 SerdangSelangorMalaysia Faculty of Science and Technology Universiti Sains Islam Malaysia71800 NilaiNegeri SembilanMalaysia

The behavior of the stress intensity factor at the tips of cracks subjected to uniaxial tension σχ^∞= p with traction-free boundary condition in half-plane elasticity is investigated. The problem is formulated into singular integral equations with the distribution dislocation function as unknown. In the formulation, we make used of a modified complex potential. Based on the appropriate quadrature formulas together with a suitable choice of collocation points, the singular integral equations are reduced to a system of linear equations for the unknown coefficients. numerical examples show that the values of the stress intensity factor are influenced by the distance from the cracks to the boundary of the half-plane and the configuration of the cracks.

关键词： Elastic half-plane multiple cracks Singular integral equation Sine-shaped crack

On SOmE mODEL DIFFUSIOn PROBLEmS WITH A nOnLOCAL LOWER ORDER TERm

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Chinese Annals of mathematics,Series B 2003年第2期24卷 147-166页

作者： n.H.CHAnG m.CHIPOT Academia Sinica Institute of MathematicsTaipei 11 529Taiwan China.Institut fur MathematikAbt.Angewandte MathematikUniversitat Zurich Winterthurerstrasse 190CH-8057 ZurichSwitzerland.

The authors consider a class of nonlinear parabolic problems where the lower order term isdepending on a weighted integral of the solution, and address the issues of existence, uniqueness,stationary solutions and in s... 详细信息

关键词： nonlocal problems Elliptic equations Parabolic equations Asymptotic behaviour Stationary problems

Elite Opposition Based metaheuristic Framework for Load Balancing in LTE network

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Computers, materials & Continua 2022年第6期71卷 5765-5781页

作者： m.R.Sivagar n.Prabakaran Department of Computer Science and Engineering Sathyabama Institute of Science&TechnologyChennai600119India Department of Electronics and Communication Engineering Koneru Lakshmaiah Education FoundationGuntur522502Andhra PradeshIndia

In present scenario of wireless communications,Long Term Evolution(LTE)based network technology is evolved and provides consistent data delivery with high speed andminimal delay through mobile *** traffic management and effective utilization of network resources are the key factors of LTE ***,there are some major issues in LTE that are to be considered are effective load scheduling and traffic *** LTE is a depraved technology,it is been suffering from these *** addressing that,this paper develops an Elite Opposition based Spider monkey Optimization Framework for Efficient Load Balancing(SmO-ELB).In this model,load computation of each mobile node is done with Bounding Theory based Load derivations and optimal cell selection for seamless communication is processed with Spider monkey Optimization *** simulation results show that the proposed model provides better results than exiting works in terms of efficiency,packet delivery ratio,Call Dropping Ratio(CDR)and Call Blocking Ratio(CBR).

关键词： Spider monkey optimization load balancing long term evolution optimal cell selection handover LTE networks QoS

nUmERICAL SImULATIOnS FOR A VARIABLE ORDER FRACTIOnAL CABLE EQUATIOn

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Acta mathematica Scientia 2018年第2期38卷 580-590页

作者： A.m.nAGY n.H.SWEILAm Department of mathematics Faculty of Science Benha University Department of mathematics Faculty of Science Cairo University

In this article, Crank-nicolson method is used to study the variable order fractional cable equation. The variable order fractional derivatives are described in the Riemann- Liouville and the Griinwald-Letnikov sense. The stability analysis of the proposed technique is discussed. numerical results are provided and compared with exact solutions to show the accuracy of the proposed technique.

关键词： Crank-nicolson method variable order fractional cable equation stability anal-ysis

Catalytic activity of manganese oxide supported on alumina in the synthesis of quinoxalines

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Frontiers of Chemical Science and Engineering 2013年第4期7卷 415-421页

作者： Rekha m. Kathyayini H nagaraju n Catalysis Research Laboratory St Joseph's College Post Graduate and Research Centre Bangalore 560027 India Centre for Emerging Technologies Global Campus Jain University Bangalore 562112 India

Two catalysts, alumina and manganese oxide supported on alumina, have been prepared by calcination and precipitation-impregnation methods, respectively. The catalysts are characterised by the following techniques： Brunner-Emmett-Teller-n2 adsorption-desorption for sur- face area, temperature programmed desorption of nH3 and n-butyl amine back titration methods for surface acidity, powder X-ray diffraction for textural properties, and Fourier transform infrared spectroscopy for the anionic radicals. The catalytic activity has been determined under heterogeneous conditions in the condensation reaction between o-phenylenediamine and benzil. The product purity is checked by thin-layer chromatography and melting point. The products are also analysed by LC-mS and 1H-nmR techniques. The yields of the products have been found to be good and catalysts exhibited excellent recyclability. The effect of changing the reaction para- meters such as temperature, reaction time, amount of the catalyst, nature of solvent and molar ratio of reactants on the yield of the product has been studied. The surface acidity of the catalysts plays an important role in activating the reaction.

关键词： alumina manganese oxide deposited onalumina quinoxaline synthesis

magnetic and electronic properties of double perovskite Sr2CrmoO6 for spintronic applications: insights from first-principles and monte Carlo approaches

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Communications in Theoretical Physics 2024年第12期76卷 168-175页

作者： H Kerrai n Zaim m Kerouad A Zaim Laboratoire de Physique des matériaux et modélisation des Systèmes (LP2mS) Unité Associée au CNRST-URAC: 08 Moulay Ismail University Faculty of Sciences

In this work,we studied the electronic and magnetic properties of the double perovskite Sr2CrmoO6using ab initio calculations with generalized gradient approximation（GGA） and monte Carlo（mC） *** compound has two magnetic sublattices:one occupied by mo5+with spin（S=1/2） and the other by Cr3+with spin（σ=3/2） The results showed halfmetallic behavior with a total magnetic moment of 2.0 μB. Using monte Carlo simulations,we investigated the phase transitions and observed interesting phenomena such as a critical endpoint and both second-order and first-order phase ***,the results revealed compensation points for specific values of the crystal field.

关键词： DFT magnetic properties monte Carlo simulation spintronic applications