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Reiner-Rivlin nanomaterial heat transfer over a rotating disk with distinct heat source and multiple slip effects

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Applied Mathematics and Mechanics(English Edition) 2021年第10期42卷 1495-1510页

作者： A.S.SAbU J.MACKOLIL b.MAHANTHESH A.mathew Department of Mathematics St.Thomas College(Autonomous)Thrissur 680001KeralaIndia Center for Mathematical Needs Department of MathematicsCHRIST(Deemed to be University)Bengaluru 560029KarnatakaIndia

The thermodynamic features of the Reiner-Rivlin nanoliquid flow induced by a spinning disk are analyzed *** non-homogeneous two-phase nanofluid model is considered to analyze the effect of nanoparticles on the thermodynamics of the Reiner-Rivlin nanomaterial,which also includes a temperature-dependent heat source(THS)and an exponential space-dependent heat source(ESHS).Further,the transfer of heat and mass is analyzed with velocity slip,volume fraction jump,and temperature jump boundary *** finite difference method-based routine is used to solve the complicated differential equations formed after using the von-Karman similarity *** cases of the present problem are found to be in good agreement with benchmarking *** relationship of the pertinent parameters with the heat and mass transport is scrutinized using correlation,which is further evaluated based on the probable error *** models are fitted for the friction factor at the disk and heat transport,which accurately predict the dependent *** Reiner-Rivlin nanoliquid temperature is influenced comparatively more by the ESHS than by *** Nusselt number is decreased by the ESHS and THS,whereas the friction factor at the disk is predominantly decremented by the wall roughness *** increment in the non-Newtonian characteristic of the liquid leads more fluid to drain away in the radial direction far from the disk compared with the fluid nearby the disk in the presence of the centrifugal force during *** increased thermal and volume fraction slip lowers the nanoliquid temperature and nanoparticle volume fraction profiles.

关键词： rotating surface Reiner-Rivlin fluid nanomaterial exponential space-based heat source multiple slip effect regression analysis

Effect of post-thermal annealing on the structural and optical properties of ZnO thin films prepared from a polymer precursor

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Chinese Physics b 2012年第7期21卷 551-558页

作者： Jijoy.P.mathew George Varghese Jacob mathew Thin Film Research Laboratory Department of PhysicsSt.Berchmans CollegeChanganasseryKerala 686101India Department of Physics Calicut UniversityThenjippalamKeralaIndia

ZnO thin films were synthesised by a new method which uses polyvinyl alcohol （PVA） as the polymer precursor. The films are annealed at different temperatures and for different annealing times. The structural parameters, like grain size, lattice constants, optical band gap, and Urbach energy, depend on the annealing temperature and time. All the films possess tensile strain, which relaxes as the annealing temperature and time increase. The photoluminescence （PL） spectra contain only ultraviolet （UV） peaks at low temperature, but as the annealing temperature and time increase, we observe peaks at the blue and green regions with a variation in the intensities of these peaks with annealing temperature and time.

关键词： stress, band gap, Urbach energy photoluminescence

Periodic energy decomposition analysis for electronic transport studies as a tool for atomic scale device manufacturing

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International Journal of Extreme Manufacturing 2020年第1期2卷 164-172页

作者： Paven Thomas mathew Fengzhou Fang Centre of Micro/Nano Manufacturing Technology MNMT-DublinUniversity College DublinIreland State Key Laboratory of Precision Measuring Technology and Instruments Centre of Micro/Nano Manufacturing TechnologyMNMTTianjin UniversityPeople’s Republic of China

Atomic scale manufacturing is a necessity of the future to develop atomic scale devices with high precision.A different perspective of the quantum realm,which includes the tunnelling effect,leakage current at the atomic-scale,Coulomb blockade and Kondo effect,is inevitable for the fabrication and hence,the mass production of these *** these atomic-scale device development,molecular level devices must be *** theoretical studies could be an aid towards the experimental *** transport studies are the basis to realise and interpret the problems happening at this minute *** these in mind,we present a periodic energy decomposition analysis(pEDA)of two potential candidates for moletronics:phthalocyanines and porphyrins,by placing them over gold substrate cleaved at the(111)plane to study the adsorption and interaction at the interface and then,to study their application as a channel between two electrodes,thereby,providing a link between pEDA and electronic transport *** provides information regarding the bond strength and the contribution of electrostatic energy,Pauli’s energy,orbital energy and the orbital *** this analysis with electronic transport studies can provide novel directions for atomic/close-toatomic-scale manufacturing(ACSM).Literature survey shows that this is the first work which establishes a link between pEDA and electronic transport studies and a detailed pEDA study on the above stated *** results show that among the molecules studied,porphyrins are more adsorbable over gold substrate and conducting across a molecular junction than phthalocyanines,even though both molecules show a similarity in adsorption and conduction when a terminal thiol linker is attached.A further observation establishes the importance of attractive terms,which includes interaction,orbital and electrostatic energies,in correlating the pEDA study with the transport *** progressing this re

关键词： phthalocyanine porphyrin potential energy decomposition analysis potential energy surface scan moletronics ACSM Manufacturing III

Computational Design and Fabrication of Enantioselective Recognition Sorbents for L-phenylalanine benzyl Ester on Multiwalled Carbon Nanotubes Using Molecular Imprinting Technology

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Chinese Journal of Polymer Science 2019年第12期37卷 1305-1318,I0009页

作者： T Sajini Renjith Thomas beena mathew Research&Post Graduate Department of Chemistry St.Berchmans College(Autonomous)Affiliated to Mahatma Gandhi UniversityChanganassery School of Chemical Sciences Mahatma Gandhi UniversityPriyadarsini Hills P O.Kottayan 686560India

Computational strategies have been employed to investigate the influence of the nature of monomers and cross-linker in order to design three dimensional imprinted polymers with selective recognition sites for L-phenylalanine benzyl ester(L-PAbE)***,computational chemistry methods were applied to screen the molar quantity of functional monomers that interact with one mole of the template *** of the nature of functional monomer,cross-linker,and molar ratio were determined computationally using density functional calculations with b3LYP functional and generic 6-31G basis *** acid(MAA)and ethylene glycol dimethacrylate(EGDMA)were used as the functional monomer and crosslinking agent,respectively.L-PAbE imprinted polymer layered on multiwalled carbon nanotube(MWCNT)and conventional bulk MIP were synthesised and characterized as *** investigate the influence of pre-organization of binding sites on the selectivity of L-PAbE,respective non-imprinted polymers were also ***-MIPs and MIPs exhibited the highest adsorption capacity towards *** synthesized polymers revealed characteristic adsorption features and selectivity towards L-PAbE in comparison with those of its enantiomer analogues.

关键词： Molecular imprinting L-phenylalanine benzyl ester Density functional theory Monomer Cross-linker Selectivity

Analysis of equilibrium, kinetic, and thermodynamic parameters for biosorption of fluoride from water onto coconut(Cocos nucifera Linn.)root developed adsorbent

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Chinese Journal of Chemical Engineering 2019年第1期27卷 92-99页

作者： Aju mathew George Ajay R.Tembhurkar Civil Engineering Department Visvesvaraya National Institute of Technology

Drinking water with higher fluoride levels results in serious irremediable health problems that have attained a startle all over the *** focused towards deflouridation through the application of biosorbents prepared from various plants are finding greater scope and *** research is done on Cocos nucifera Linn.(coconut tree) one of the very commonly available plants throughout Kerala and around the *** adsorbent developed from the root portion of *** *** used in the present *** study revealed that the fluoride uptake capacity is quite significant and linearly increases with initial adsorbate *** adsorption data is analyzed for Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich isotherm models at varying initial adsorbate concentrations(2–25 mg·L^(-1)).It is found that the adsorption of fluoride onto *** *** adsorbent follows Langmuir *** isotherm constants "a" and "b" obtained are 2.037 mg·g^(-1) and 0.823 L·mg^(-1) at an adsorbent dose of 8 g·L^(-1) and temperature(26 ± 1) ℃.The mean free sorption energy, E obtained, is 9.13 kJ ·mol^(-1) which points out that the adsorption of fluoride onto *** *** adsorbent is by chemisorption *** kinetic study also supports chemisorption with adsorption data fitting well with a pseudo-second-order kinetic model with an estimated rate constant K_2 of 0.2935 g·mg^(-1) min at an equilibrium contact time of 90 *** thermodynamic study indicated the spontaneous and endothermic nature(ΔH =12.728 kJ·mol^(-1)) of fluoride adsorption onto the *** *** *** Electron Microscopy(SEM), bET, FTIR, and EDX methods were used to analyze the surface morphology of adsorbent before and after fluoride adsorption *** on deflouridation using *** *** adsorbent application on fluoride contaminated ground water samples from fields showed encouraging results.

关键词： Fluoride biosorption Equilibrium Kinetics Thermodynamics Application

奶牛饲料中添加等量不同来源的饲料对牛奶产量和总消化率的影响

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饲料博览 2017年第3期27卷 49-49页

作者： Eastridge M L Starkey R A Gott P N Oelker E R Sewell A R mathew b Firkins J L

试验旨在探究玉米秸秆和小麦秸秆制成的有效中性洗涤纤维(peNDF)对泌乳奶牛的影响。选取5头荷斯坦奶牛,植入瘤胃瘘管,采用5×5拉丁方设计。试验组分为CS组,饲喂玉米青贮饲料,全混合日粮(TMR)441 g·kg^(-1);ALF组,饲喂玉米青贮饲料和苜... 详细信息

试验旨在探究玉米秸秆和小麦秸秆制成的有效中性洗涤纤维(peNDF)对泌乳奶牛的影响。选取5头荷斯坦奶牛,植入瘤胃瘘管,采用5×5拉丁方设计。试验组分为CS组,饲喂玉米青贮饲料,全混合日粮(TMR)441 g·kg^(-1);ALF组,饲喂玉米青贮饲料和苜蓿干草115 g·kg^(-1),455 g·kg^(-1)TMR;STW-5组,饲喂玉米青贮和小麦秸秆50 g·kg^(-1),390 g·kg^(-1)TMR;STW^(-1)0组,饲喂玉米青贮和秸秆100 g·kg^(-1),462 g·kg^(-1)TMR;STV组,饲喂玉米青贮和玉米秸秆55 g·kg^(-1),395 g·kg^(-1)TMR。除秸秆中含有a NDF 230 g·kg^(-1)以外,其余日粮成分中a NDF含量为180 g·kg^(-1)。STW-5组中干物质摄入量(DMI)最高,ALF组与之相近。各组奶牛体重(734 kg)和体况评分(3.18)相近,产奶量(35.6 kg·d^(-1))、乳脂肪含量(35.6 kg·d^(-1))、乳蛋白质含量(28.7 kg·d^(-1))和牛奶中尿素氮含量(17.4 mg·d L^(-1))相近。不同饲料来源对总消化率无显著影响,干物质消化率为0.757,有机质消化率为0.769,NDF消化率为0.635。各组间瘤胃p H为6.12,乙酸:丙酸为3.10,瘤胃总挥发性脂肪酸浓度和乙酸,丙酸、丁酸、戊酸的比例相近。与其他各组相比,STW-10组异戊酸和异丁酸的比例最高,ALF组异戊酸含量低于STW-5组和STW-10组。饲喂小麦秸秆5%可达到最高的DMI,但饲喂小麦秸秆10%组DMI降低,这可能是由于瘤胃内容物过多。饲喂与玉米青贮饲料中a NDF浓度相近的玉米秸秆、苜蓿干草和小麦秸秆对动物的生产性能、瘤胃发酵无显著影响。

关键词：有效纤维青贮玉米玉米秸秆秸秆苜蓿干草

Spectroscopic studies of gel-grown lanthanum malonate crystals

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Journal of Rare Earths 2012年第3期30卷 245-249页

作者： Varghese mathew Sabu Jacob Lizymol Xavier K.E.Abraham Department of Physics St.Aloysius'CollegeEdathua-689573India Department of Physics S.B.CollegeChanganacherry-686101India

Lanthanum malonate crystals were grown by single tube ionic diffusion through silica gel. The crystallinity of the grown crystals was analyzed by powder X-ray diffraction studies. Fourier transform infrared spectroscopy （FTIR） and fourier transform （FT） Raman studies confirmed the presence of functional groups in the title compound. The optical band gap energy of the material was extracted from diffuse reflectance spectrum.

关键词： lanthanum malonate crystal growth X-ray diffraction analysis DRS studies FTIR and FT Raman studies rare earths

Atomic and Close-to-Atomic Scale Manufacturing:A Review on Atomic Layer Removal Methods Using Atomic Force Microscopy

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Nanomanufacturing and Metrology 2020年第3期3卷 167-186页

作者： Paven Thomas mathew brian J.Rodriguez Fengzhou Fang Centre of Micro/Nano Manufacturing Technology(MNMT-Dublin) University College DublinDublin D04V1W8Ireland School of Physics University College DublinBelfieldDublin D04 V1W8Ireland Conway Institute of biomolecular and biomedical Research University College DublinBelfield.Dublin D04V1W8Ireland State Key Laboratory of Precision Measuring Technology and Instruments Centre of Micro/Nano Manufacturing TechnologyMNMT.Tianjin UniversityTianjin 300072China

Manufacturing at the atomic scale is the next generation of the industrial *** and close-to-atomic scalemanufacturing(ACSM)helps to achieve *** force microscopy(AFM)is a promising method for this purposesince an instrument to machine at this small scale has not yet been *** the need for increasing the number ofelectronic components inside an integrated circuit chip is emerging in the present-day scenario,methods should be adoptedto reduce the size of connections inside the *** can be achieved using ***,connecting moleculeswith the electrodes and then to the external world is *** must be laid to make this possible for *** layer removal,down to one atom,can be employed for this ***,theoretical works are beingperformed extensively to study the interactions happening at the molecule-electrode junction,and how electronic transportis affected by the functionality and robustness of the *** theoretical studies can be verified experimentally only if nano electrodes are *** is widely used in the semiconductor industry to fabricate electronic ***,carbon-based materials such as highly oriented pyrolytic graphite,gold,and silicon carbide find applications inthe electronic device manufacturing ***,ACSM of these materials should be developed *** paperpresents a review on the state-of-the-art research performed on material removal at the atomic scale by electrochemical andmechanical methods of the mentioned materials using AFM and provides a roadmap to achieve effective mass productionof these devices.

关键词： Atomic force microscopy Atomic-scale manufacturing Molecular scale devices Electrochemistry ACSM ManufacturingⅢ

Evaluation of WEPP versus EGEM and empirical model efficiencies in predicting ephemeral gully erosion around Mubi area,Northeast Nigeria

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International Soil and Water Conservation Research 2021年第1期9卷 11-25页

作者： Ijasini John Tekwa John mathew Laflen Abubakar Musa Kundiri Abdullahi bala Alhassan Department of Soil Science&Land Resources Management Federal University WukariP.M.B1020Wukari Taraba StateNigeria USDA-ARS National Soil Erosion Research LaboratoryPurdue UniversityLafayetteINUSA Department of Soil Science Faculty of AgricultureUniversity of MaiduguriP.M.B1069Borno StateNigeria

Evaluation of prediction models is crucial to achieving valid information on erosion processes and their management *** model efficiency in predicting ephemeral gully(EG)erosion was recently tested and compared with both EGEM and empirical *** models abilities to predict EG erosion were validated using measured estimates at the 6 eroding locations around Mubi area in Northeast Nigeria between April 2008 and October *** location consisted of 3 watersheds where data on soils,climate,slope,management practices,EG shapes and dimensions were *** on relevant soil properties were collected in the field and then analyzed in *** mass of soil loss(MSL)predicted by empirical,EGEM and WEPP models were compared with the measured using paired T-test,regression graphs(r^(2)-values),error analysis,and analysis of variance(ANOVA)in a completely ran-domized *** EG erosion losses varied significantly(P≤0.05)between sites and *** sig-nificant(P≤0.05)differences were observed between measured and the empirically predicted aggregate *** measured aggregate MSL strongly correlated with those predicted by empirical(r^(2)=0.67),than with EGEM(r^(2)=0.57),and WEPP(r^(2)=0.53)*** over and under-prediction instances against the measured erosion were noted with all the *** WEPP model was found to slightly over-predict MSL when compared to either the empirical or EGEM *** prediction quality of the models was generally *** works should focus more on local inputs such as climate,plants,management,and tillage data for use with WEPP.

关键词： Empirical EGEM WEPP Ephemeral gully erosion Soil loss Mubi Northeast Nigeria