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Suppression of grain boundary migration at cryogenic temperature in an extremely fine nanograined ni-Mo alloy

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journal of Materials Science & Technology 2020年第22期54卷 65-69页

作者： j.Hu j.X.Li Y.-n.Shi Shenyang national Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Institute of Advanced Materials East China JiaoTong UniversityNanchang 330013China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China

Microindentation creep tests on an electrodeposited extremely fine(4.9 nm) nanograined(ng) ni-14.2 at.% Mo(ni-14.2 Mo) at both room temperature(RT) and liquid nitrogen temperature(LnT) demonstrated that lowering temperature retarded softening in the ng ni-Mo alloy. The obtained strain rate sensitivity at LnT was one order of magnitude lower than that at RT. Microstructural characterization revealed that mechanically-driven grain boundary(GB) migration was greatly suppressed by lowering temperature,which might be ascribed to the presence of solute Mo atoms that significantly retarded coupled GB motion at LnT. Deformation was instead carried by shear bands.

关键词： Extremely fine nanograined metals Mechanically-driven grain boundary migration Cryogenic temperature Shear bands Solute atoms

Tensile ductility and deformation mechanisms of a nanotwinned 316L austenitic stainless steel

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journal of Materials Science & Technology 2020年第1期36卷 65-69页

作者： Y.Z.Zhang j.j.Wang n.R.Tao Shenyang national Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China University of Chinese Academy of Sciences Beijing 100049China

A nanotwinned 316 L austenitic stainless steel was prepared by means of surface mechanical grinding *** recovery annealing,the density of dislocations decreases obviously while the average twin/matrix lamella thickness still keeps in the nanometer *** annealed nanotwinned sample exhibits a high tensile yield strength of 771 MPa and a considerate uniform elongation of 8%.TEM observations showed that accommodating more dislocations and secondary twinning inside the nanotwins contribute to the enhanced ductility and work hardening rate of the annealed nanotwinned sample.

关键词： nanotwinned Stainless steel Ductility Deformation mechanism

The impact of maternal immune activation on the morphology and electrophysiological properties of postnatally-born neurons in the offspring

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neural Regeneration Research 2024年第2期19卷 399-400页

作者： Emilio j.Galván Angelica Zepeda Departamento de Farmacobiología CINVESTAV Unidad Sur CdMxMéxico、Centro de Investigaciones sobre el EnvejecimientoCIE-CinvestavCdMxMéxico Departamento de Medicina Genómica y Toxicología Ambiental Instituto de Investigaciones BiomédicasUniversidad Nacional Autónoma de MéxicoUNAMCdMxMéxico

Pregnancy comes with a combination of physical changes and physiological immunosuppression that increases the susceptibility of women to pathogens and in turn,rises the prevalence of infectious diseases.

关键词： prevalence activation impact

nanoscale strained-Si MOSFET physics and modeling approaches:a review

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journal of Semiconductors 2010年第10期31卷 19-23页

作者： Amit Chaudhry j.n.Roy Garima joshi University Institute of Engineering and Technology Panjab University Solar Semiconductor Private Limited

An attempt has been made to give a detailed review of strained silicon technology. Various device models have been studied that consider the effect of strain on the devices, and comparisons have been drawn. A review of some modeling issues in strained silicon technology has also been outlined. The review indicates that this technology is very much required in nanoscale MOSFETs due to its several potential benefits, and there is a strong need for an analytical model which describes the complete physics of the strain technology.

关键词： mobility SiGe strained-Si technology CAD

Better together? Treating traumatic brain injury with minocycline plus n-acetylcysteine

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neural Regeneration Research 2022年第12期17卷 2589-2592页

作者： Siobhán Lawless Peter j.Bergold Graduate Program in neural and Behavioral Sciences State University of New York-Downstate Health Sciences UniversityBrooklynNYUSA Department of Physiology and Pharmacology State University of New York-Downstate Health Sciences UniversityBrooklynNYUSA

Traumatic brain injury has a complex pathophysiology that produces both rapid and delayed brain damage. Rapid damage initiates immediately after injury. Treatment of traumatic brain injury is typically delayed many hours, thus only delayed damage can be targeted with drugs. Delayed traumatic brain injury includes neuroinflammation, oxidative damage, apoptosis, and glutamate toxicity. Both the speed and complexity of traumatic brain injury pathophysiology present large obstacles to drug development. Repurposing of Food and Drug Administration-approved drugs may be a highly efficient approach to get therapeutics to the clinic. This review examines the preclinical outcomes of minocycline and n-acetylcysteine as individual drugs and compares them to the minocycline plus n-acetylcysteine combination. Both minocycline and n-acetylcysteine are Food and Drug Administration-approved drugs with pleiotropic therapeutic effects. As individual drugs, minocycline and n-acetylcysteine are well tolerated, with known pharmacokinetics, and enter the brain through an intact blood-brain barrier. At concentrations greater than needed for antimicrobial action, minocycline is a potent anti-inflammatory minocycline, also acts as an antioxidant and inhibits multiple enzymes that promote brain injury including metalloproteases, caspases, and polyADP-ribose-polymerase-1. n-acetylcysteine alone is also an antioxidant. It increases brain glutathione, prevents lipid oxidation, and protects mitochondria. n-acetylcysteine also acts as an anti-inflammatory as well as increases extracellular glutamate by activating the X;cystine-glutamate antitransporter. These multiple actions of minocycline and n-acetylcysteine have made them attractive candidates to treat traumatic brain injury. When first dosed within the one hour after injury, either minocycline or n-acetylcysteine improves a diverse set of therapeutic outcome measures in multiple traumatic brain injury animal models. A small number of clinical

关键词： clinical trial outcome measures preclinical testing rodent models of traumatic brain injury therapeutic time window

On-going nitrification in chloraminated drinking water distribution system(DWDS) is conditioned by hydraulics and disinfection strategies

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journal of Environmental Sciences 2020年第10期32卷 151-162页

作者： Yi Shi Akintunde Babatunde Bettina Bockelmann-evans Qijie Li Liang Zhang national Engineering Laboratory for Cereal Fermentation Technology Jiangnan UniversityWuxi 214122China Discipline of Ciuil Engineering Cardiff University School of EngineeringThe ParadeCardiffCF243AAUK School of Civil Engineering University of LeedsLeedsLS29JTUK

Within the drinking water distribution system(DWDS)using chloramine as disinfectant,nitrification caused by nitrifying bacteria is increasingly becoming a concern as it poses a great challenge for maintaining water *** investigate efficient control strategies,operational conditions including hydraulic regimes and disinfectant scenarios were controlled within a flow cell experimental *** test phases were conducted to investigate the effects on the extent of nitrification of three flow rates(Q=2,6,and 10 L/min)and four disinfection scenarios(total Cl2=1 mg/L,Cl2/nH3-n=3:1;total Cl2=1 mg/L,Cl2/nH3-n=5:1;total Cl2=5 mg/L,Cl2/nH3-n=3:1;and total Cl2=5 mg/L,Cl2/nH3-n=5:1).Physico-chemical parameters and nitrification indicators were monitored during the *** characteristics of biofilm extracellular polymetric substance(EPS)were evaluated after the *** main results from the study indicate that nitrification is affected by hydraulic conditions and the process tends to be severe when the fluid flow transforms from laminar to turbulent(2300ncreasing disinfectant concentration and optimizing Cl2/nH3-n mass ratio were found to inhibit nitrification to some extend when the system was running at turbulent condition(Q=10 L/min,Re=5535).EPS extracted from biofilm that was established at the flow rate of 6 L/min had greater carbohydrate/protein ***,several nitrification indicators were evaluated for their prediction efficiency and the results suggest that the change of nitrite,together with total organic carbon(TOC)and turbidity can indicate nitrification potential efficiently.

关键词： nitrification Drinking water distribution system(DWDS) Biofilm Hydraulics Disinfection

Algebraic and group treatments to nonlinear displaced number states and their nonclassicality features:A new approach

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Chinese Physics B 2015年第6期24卷 334-340页

作者： n Asili Firouzabadi M K Tavassoly M j Faghihi Atomic and Molecular Group Faculty of PhysicsYazd University The Laboratory of Quantum Information Processing Yazd University Physics and Photonics Department Graduate University of Advanced Technology

Recently, nonlinear displaced number states （nDnSs） have been manually introduced, in which the deformation function f（n） has been artificially added to the previously well-known displaced number states （DnSs）. Indeed, just a simple comparison has been performed between the standard coherent state and nonlinear coherent state for the formation of nDnSs. In the present paper, after expressing enough physical motivation of our procedure, four distinct classes of nDnSs are presented by applying algebraic and group treatments. To achieve this purpose, by considering the DnSs and recalling the nonlinear coherent states formalism, the nDnSs are logically defined through an algebraic consideration. In addition, by using a particular class of Gilmore-Perelomov-type of SU（1,1） and a class of SU（2） coherent states, the nDnSs are introduced via group-theoretical approach. Then, in order to examine the nonclassical behavior of these states, sub-Poissonian statistics by evaluating Mandel parameter and Wigner quasi-probability distribution function associated with the obtained nDnSs are discussed, in detail.

关键词： displaced number state nonlinear coherent state Wigner function nonclassical state

SPICE compatible analytical electron mobility model for biaxial strained-Si-MOSFETs

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journal of Semiconductors 2011年第5期32卷 36-41页

作者： Amit Chaudhry j.n.Roy S.Sangwan UIET Panjab UniversityChandigarhIndia Solar Semiconductro Pvt.Ltd HyderabadIndia

This paper describes an analytical model for bulk electron mobility in strained-Si layers as a function of strain. Phonon scattering, columbic scattering and surface roughness scattering are included to analyze the full mobility model. Analytical explicit calculations of all of the parameters to accurately estimate the electron mobility have been made. The results predict an increase in the electron mobility with the application of biaxial strain as also predicted from the basic theory of strain physics of metal oxide semiconductor （MOS） devices. The results have also been compared with numerically reported results and show good agreement.

关键词： mobility SiGe strained-Si phonon surface roughness columbic

Influence of nano-MgO particle size on bactericidal action against Bacillus subtilis var. niger

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Chinese Science Bulletin 2005年第6期50卷 514-519页

作者： HUAnGLei LIDianqing LInYanjun DavidG.evans DUAnXue KeyLaboratoryofScienceandTechnologyofControllableChemicalReactions MinistryofEducationBeijingUniversityofChemicalTechnologyBeijing100029China

nano-MgO with various particle sizes, synthe- sized by different methods using Mg(nO3)2·6H2O, na2CO3, na2SO4, urea and ammonia solution as reactants, was used to carry out bactericidal experiments on Bacillus subtilis var. niger. The results were compared with the effect of TiO2, a common kind of photocatalytic material. The materials were characterized by X-ray Diffraction (XRD), Transmission Electron Microscopy (TEM), low temperature n2 adsorp- tion-desorption measurements and FT-IR, and the results showed that the bactericidal ability of MgO increases with decreasing particle size. nano-MgO and an interior wall-paint containing the material have better bactericidal effects than nono-TiO2 in both presence and absence of light. The bactericidal mechanism is discussed. The surface of MgO can generate high concentrations of O?2 which is highly active and can react with the peptide linkages in the coating walls of the spores. The spores are destroyed by the resulting damage to their structure.

关键词：氧化镁合成方法 “Bacillus subtilis var.niger” 杀菌活性细菌氧离子晶体