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Suppression of Ambipolar Conduction in Schottky Barrier Carbon Nanotube Field Effect Transistors:Modeling,Optimization Using particle Swarm Intelligence,and Fabrication

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Computer Modeling in Engineering & Sciences 2019年第6期119卷 577-591页

作者： p.Reena Monica v.T.Sreedevi School of Electronics Engineering VIT ChennaiVandalur-Kelambakkam RoadChennai603103India School of Electrical Engineering VIT ChennaiVandalur-Kelambakkam RoadChennai603103India

A mathematical model and experimental analysis of the impact of oxide thickness on the ambipolar conduction in Schottky Barrier Carbon Nanotubes(CNTs)Field Effect Transistor(SB CNTFETs)is *** of ambipolar conduction in SB CNTFETs is imperative in order to establish them as the future of IC *** ambipolar nature of SB CNTFETs leads to a great amount of leakage *** a gate oxide dielectric of thickness,tox^50 nm suppresses the ambipolar *** an SB CNTFET,it is the electric field at the source/drain contacts that control the conductance and the band bending length at the contacts is defined by ***,tox is the prime parameter that influences the width of the Schottky barrier and the current in the subthreshold *** to the wide SB,there is a loss in on-current due to tunneling,but the current due to thermionic emission is increased by employing a high-κdielectric such as Zirconium dioxide(ZrO2).This work proposes an approach to suppress ambipolar behavior in SB CNTFETs without decreasing the on *** thickness and dielectric constant of the gate oxide are optimized using the particle swarm optimization(pSO)algorithm to achieve suppression of ambipolar conduction without any loss in *** proposed SB CNTFET was modeled using *** demonstration of the suppression of ambipolar property is also *** SB CNTFETs are fabricated using high-κdielectric such as ZrO2 with different thickness.A device with thin(~5 nm)gate oxide and another device with thick(~50 nm)gate oxide were *** the experimental results,it is observed that the device with the thin gate oxide exhibited ambipolar characteristics and the device with the thick gate oxide did not exhibit ambipolar *** increase in thickness,tox,ensures suppression of ambipolar behavior.

关键词： Ambipolar conduction Carbon nanotubes high-κgate oxide Schottky barrier

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Intensity and composition-dependent sign reversal of non-linearity in TiO_2/CeO_2 nanocomposites

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Chinese physics B 2014年第3期23卷 298-302页

作者： S.Divya v.p.N.Nampoori p.Radhakrishnan A.Mujeeb International School of photonics Cochin University of Science and Technology

CeO2/TiO2 composite nanoparticles with different Ce/Ti molar ratios have been successfully synthesized via sol-gel method. It was found that the band gap of the nanocomposite is tunable by varying Ce/Ti content. The nonlinear response of the sample was studied by using the nanosecond laser pulses from a Q switched Nd：Yag laser employing the Z-scan method. Open aperture Z-scan experiment revealed that with the increase in the CeO2 amount in the nanocomposite, the non-linearity of the composite increases, and it was assumed that this could be due to the modification of TiO2 dipole symmetry by the addition of CeO2. Closed aperture Z-scan experiment showed that when the CeO2 amount increases, positive nonlinear refraction decreases, and this could be attributed to the increase in the two photon absorption which subsequently suppresses the nonlinear refraction.

关键词： sol-gel method non-linearity Z-scan experiment reversesaturation absorption curve

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Diffusion in the aged aluminium film on iron

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Chinese physics B 2017年第3期26卷 569-574页

作者： A Y Galashev O R Rakhmanova v A Kovrov Yu p Zaikov Institute of High-Temperature Electrochemistry Ural Branch of Russian Academy of Sciences Yekaterinburg 620990 Russia

Metallic coatings of many types can be applied to steel to provide outstanding, long-term corrosion protection. A thin A1 film is studied at an Fe substrate by the molecular dynamics method at temperatures ranging from 300 K to 1173 K. A1 atoms are found to penetrate the Fe matrix at a temperature of 873 K. The potential energy of the system changes step-like at a temperature of 1173 K. At such temperature mean square atomic displacement significantly changes. The behaviors of the A1 and Fe diffusion coefficients are mainly determined by the temperature dependence of the diffusion activation energy.

关键词： aluminium film diffusion coefficients iron molecular dynamics

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Mesenchymal stem cells in wound healing:A bibliometric analysis as a powerful research tool

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World Journal of Stem Cells 2024年第9期16卷 827-831页

作者： vera v voinova Daria v vasina Anton p Bonartsev Faculty of Biology MV Lomonosov Moscow State UniversityMoscow 119234Russia NF Gamaleya National Research Centre for Epidemiology and Microbiology Ministry of Health of the Russian FederationMoscow 123098Russia

Bibliographic analysis is still very rarely used in experimental basic study *** comprehensive bibliometric analysis of scientific literature on research progress and challenges in stem cell therapy for diabetic chronic wounds,which was conducted in the work of Shi et al can be a case study and a source of valuable information for writing reviews and experimental papers in this *** experimental studies on a role of mesenchymal stem cells(MSCs)in wound healing that are published in 2023-2024,such as Zhang et al in 2023,Hu et al in 2023,Wang et al in 2023 are certainly also subjects for applying this powerful tool to analyze current research,challenges and perspectives in this *** is due to the fact that these studies have addressed a great variety of aspects of the application of MSCs for the treatment of chronic wounds,such as using both the cells themselves and their various products:Sponges,hydrogels,exosomes,and genetic *** a wide variety of directions in the field of study and biomedical application of MSCs requires a deep understanding of the current state of research in this area,which can be provided by bibliometric ***,the use of such elements of bibliographic analysis as publication count by year and analysis of top-10 keywords calculated independently or cited from bibliometric analysis studies can be safely recommended for every basic study manuscripts,primarily for the“Introduction”section,and review.

关键词： Bibliometric analysis Mesenchymal stem cells Wound healing Tissue engineering Dressing Hydrogels Matrix Exosomes

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HEAT TRANSFER OF TiO_2/WATER NANOFLUID IN A COILED AGITA-TED vESSEL WITH pROpELLER

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Journal of Hydrodynamics 2012年第6期24卷 942-950页

作者： pERARASU v.T. ARIvAZHAGAN M. SIvASHANMUGAM p. Heat Transfer Research Laboratory Department of Chemical EngineeringNational Institute of Technology

An attempt is made to investigate heat transfer enhancement using nanofluid in a coiled agitated vessel fitted with propeller agitator. The heat transfer coefficient in coiled agitated vessel for water and TiO2/water nanofluid of 3 different volume concentrations （0.10%, 0.20% and 0.30%） are estimated and compared. The heat transfer coefficient for nanofluid is found to be higher than that for water and also found to increase with increasing volume concentrations. The enhancement in the convective heat transfer using nanofluid is found to be a maximum of 17.59%. Empirical correlations are separately formed for water and TiO2/water nanofluid as well as found to fit the experimental data within ±5% for water and within ±10% for nanofluid.

关键词： coiled agitated vessel heat transfer enhancement Nusselt number TiO2/water nanofluid

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Microstructure and corrosion behavior of NiTi shape memory alloys sintered in the SpS process

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International Journal of Minerals,Metallurgy and Materials 2019年第10期26卷 1311-1321页

作者： C.velmurugan v.Senthilkumar p.S.Kamala Department of production Engineering National Institute of Technology

NiTi shape memory alloys(SMAs) was developed using the spark-plasma sintering(SpS) process with different average particle size(45 μm and 10 μm) under various temperature. The influence of particle size and temperature on the density, microstructure, and corrosion behavior of the NiTi in simulated body fluid was examined. The porosity decreased with increasing sintering temperature and decreasing particle size, which resulted in an increase in density of the alloy. Increasing the sintering temperature led to the formation of Ni-and Ti-rich intermetallic such as Ni3Ti and NiTi2. The formation of these secondary phases influenced the corrosion behavior of NiTi by changing its chemical composition. The planar structure of NiTi was transformed into a dendritic structure at 900℃, which resulted in the formation of uniform oxide and phosphate layers on the entire surface. A high corrosion potential and low corrosion current density were achieved with NiTi prepared with 10 μm particles at 900℃, which exhibited superior corrosion resistance.

关键词： shape memory alloys NiTi microstructure corrosion spark-plasma sintering

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Intertype superconductivity evoked by the interplay of disorder and multiple bands

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Frontiers of physics 2024年第4期19卷 81-89页

作者： p.M.Marychev A.A.Shanenko A.v.vagov HSE University 101000 MoscowRussia Center for Advanced Mesoscience and Nanotechnology MIPTDolgoprudny141700Russia

Nonmagnetic impurity scattering is known to shift up the Ginzburg-Landau parameter k of a *** this case,when the system is initially in type I,it can change its magnetic response,crossing the intertype domain with k~1 between the two standard superconductivity types and arriving at type *** the present work we demonstrate that the impact of disorder can be much more profound in the presence of the multiband structure of the charge carrier *** particular,when the band diffusivities differ from each other,the intertype domain tends to expand significantly,including points with k>>1 that belong to deep type-Ⅱ in conventional single-band *** finding sheds light on the nontrivial disorder effect and significantly complements earlier results on the enlargement of the intertype domain in clean multiband superconductors.

关键词： superconductivity disorder intertype superconductivity twoband model

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Energy conditions of the f(T,B) gravity dark energy model with the validity of thermodynamics

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Communications in Theoretical physics 2020年第8期72卷 109-118页

作者： S H Shekh v R Chirde p K Sahoo Department of Mathematics S.P.M.Science and Gilani Arts and Commerce CollegeGhatanjiYavatmalMaharashtra-445301India Department of Mathematics G.S.G.MahavidyalayaUmarkhed-445206India Department of Mathematics Birla Institute of Technology and Science-PilaniHyderabad CampusHyderabad-500078India

In this article, the analysis of Tsallis holographic dark energy(which turns into holographic dark energy for a particular choice of positive non-additivity parameter δ) in modified f(T, B) gravity with the validity of thermodynamics and energy conditions for a homogeneous and isotropic FLRW Universe has been studied. The enlightenment of the field equation towards f(T,B)=αT^m+βB^n, made possible by the fact that the model is purely accelerating,corresponds to q=-0.54(Mamon and Das 2017 Eur. phys.J.C 77 49). The generalized second law of thermodynamics is valid not only for the same temperature inside the horizon, but also for the apparent horizon for a change in temperature. The essential inspiration driving this article is to exhibit the applicability that the holographic dark energy achieved from standard Tsallis holographic dark energy and the components acquired from f(T, B) gravity are identical for the specific bounty of constants. The analysis of energy conditions confirms that the weak energy condition and the null energy condition are fulfilled throughout the expansion, while violation of the strong energy condition validates the accelerated expansion of the *** the expansion, the model becomes a quintessence dominated model. The dominant energy condition is not observed initially when the model is filled with genuine baryonic matter,whereas it appears when the model is in the quintessence dominated era.

关键词： Tsallis holographic dark energy f(T B)gravity energy conditions thermodynamics

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Chiral Autoamplification Meets Dynamic Chirality Control to Suggest Nonautocatalytic Chemical Model of prebiotic Chirality Amplification

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Research 2019年第1期2019卷 318-326页

作者： Evgenii p.Talsi Anna A.Bryliakova Roman v.Ottenbacher Tatyana v.Rybalova Konstantin p.Bryliakov Novosibirsk State University Pirogova 2Novosibirsk 630090Russia Boreskov Institute of Catalysis Pr.Lavrentieva 5Novosibirsk 630090Russia vorozhtsov Novosibirsk Institute of Organic Chemistry Pr.Lavrentieva 9Novosibirsk 630090Russia

Oxidative kinetic resolution of 1-phenylethanol in the presence of manganese complexes,bearing conformationally nonrigid achiral bis-amine-bis-pyridine ligands,in the absence of any exogenous chiral additives,is *** only driving force for the chiral discrimination is the small initial enantiomeric imbalance of the scalemic(nonracemic)substrate:the latter dynamically controls the chirality of the catalyst,serving itself as the chiral *** effect,the ee of 1-phenylethanol increases monotonously over the reaction *** dynamic control of catalyst chirality by the substrate has been unprecedented;a consistent kinetic model for this process is *** reported catalyzed substrate self-enantioenrichment mechanism is discussed in relation to the problem of prebiotic chirality amplification.

关键词： chiral Chiral catalyst

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Iron phosphate Coating: A Novel Approach to Controlling pyrite Oxidation

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pedosphere 1997年第2期7卷 103-110页

作者： HUANGXIAO v.p.EvANGELOU NanjingAgriculturalUniversity Nanjing210095（China） UniversityofKentucky LexingtonKY40549（USA）

A novel coating technique was developed for controlling pyrite oxidation. The technique invo1ved leachingpyrite particles with a solution containing low concentrations of phosphate and hydrogen peroxide. Duringthe leaching process, the iron released from pyrite by hydrogen proxide was precipitated by phosphate as aferric phosphate coating. This coating was shown to be able to effectively prevent pyrite from oxidation and itcould be established at the expense of only surface portions of pyrite. The emergence of this technique couldprovide a unique potential route for abating acid mine drainage and reclaiming sulfide-containing degradedmining land.

关键词： acid mine drainage coating pyrite

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