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Phase Homogeneity and crystal Structure of Sb_(88)Te_(12) Synthesized by Melt-quench Method

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Acta Metallurgica Sinica(English Letters) 2013年第4期26卷 441-446页

作者： c.Rangasami Department of Physics Erode Sengunthar Engineering College

Phase homogeneity and crystal structure of SbsaTe12 alloy synthesized by melt-quench method have been analyzed using X-ray diffraction （XRD） and Raman spectroscopy. Rietveld refinement of crystal structure of Sb8sTe12 has revealed the formation of SbsTe3 and Sb phases respectively with 11R and A7 structures （space group is R3m）. Phase fractions of the phases SbsTe3 and Sb have been determined to be 44.44% and 55.56% respectively. Raman spectrum of SbssTe12 has showed a highest intensity peak at 156 cm-1 and another peak at 151.1 cm-1, which correspond to Alg modes of SbsTe3 and element Sb, respectively. Analysis of Raman spectrum has substantiated the results obtained from structure refinement regarding the presence of two different phases.

关键词： SbssTe12 alloy Melt-quench method XRD Rietveld refinement Raman spectroscopy Multiphase formation

POSITRON LIFETIME STUDY OF THERMALLY INDUcED MIcROSTRUcTURAL cHANGES IN NISTARI SILK FIBER

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chinese Journal of Polymer Science 2003年第3期21卷 325-332页

作者： c.Ranganathaiah Department of Studies in Physics University of Mysore Manasagangotri Mysore-570 006 India

Positron lifetime measurements have been made in natural polymer-Nistari silk fibers as a function of isochronalannealing temperature in the range of 27℃ to 280℃. The variations in the positron results indicate the structural changesoccurring in the Nistari silk fibers and determine the glass transition temperature as 170℃. Activation energies weremeasured separately for the crystalline and amorphous regions indicating the versatility of the technique. These values areclose to the N--H bond dissociation energy, suggesting N--H bond dissociation as the most probable process occurringduring thermal treatment As an extension of the positron results, the molecular weight of the Nistari silk fibers wasdetermined to be 10.7×10~5 based on free volume, which lies within the range suggested for the silk fibers. There seems to bean indication that cross-linking changes the spiral structure of cotton fibers to network type. However, this needs to be validated by other techniques.

关键词： Nistari silk fiber Positronium Free volume Molecular weight Activation energy

ON BOUNDARY TREATMENT FOR THE NUMERIcAL SOLUTION OF THE INcOMPRESSIBLE NAVIER-STOKES EQUATIONS WITH FINITE DIFFERENcE METHODS

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Journal of computational Mathematics 1996年第2期14卷 135-142页

作者： Huang L c 中科院计算数学与科学工程计算所北京

Effect of multi-walled carbon nanotube addition on the microstructures and mechanical properties of Ti(c,N)-based cermets

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Journal of Advanced ceramics 2018年第1期7卷 58-63页

作者： P.WU S.c.LIU X.R.JIANG college of chemistry and Materials Science Longyan University

The surface modification of multi-walled carbon nanotubes(MWcNTs) was carried out using plasma treatment. The microstructures of the prepared cermets with different additions of MWcNTs were investigated by scanning electron microscopy(SEM), transmission electron microscopy(TEM), energy dispersive X-ray analysis(EDX), and X-ray diffraction(XRD). Mechanical properties such as transverse rupture strength(TRS), fracture toughness(K_(Ic)), and hardness(HRA) were measured. The results showed that some reactive groups were successfully modified on the surface of MWcNTs, resulting in the improvement of dispersibility. Most of the amorphous carbons and impurities were peeled from the MWcNTs. Increasing MWcNT addition decreased the dissolution of tungsten, titanium, and molybdenum in the binder phase. The cermet with 0.5 wt% MWcNT addition showed the highest TRS and fracture toughness. The strengthening mechanisms were attributed to the finer grain size, the homogeneous microstructure, and the higher volume fraction of binder phase in the binder. The toughening mechanisms were characterized by bridging and pulling-out.

关键词： Ti(c,N)-based cermets microstructure mechanical property fracture toughness

The cross section calculation of 112Sn(α,γ)116Te reaction with different nuclear models at the astrophysical energy range

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Nuclear Science and Techniques 2017年第8期28卷 103-109页

作者： c. Yalcin Department of Physics Kocaeli University 41380 UmuttepeKocaeli Turkey

The theoretical cross section calculations for the astrophysical p process are needed because most of the related reactions are technically very difficult to be measured in the laboratory. Even if the reaction was measured,most of the measured reactions have been carried out at the higher energy range from the astrophysical ***, almost all cross sections needed for p process simulation have to be theoretically calculated or extrapolated to the astrophysical energies.^(112)Sn(α,γ)^(116)Te is an important reaction for the p process nucleosynthesis. The theoretical cross section of ^(112)Sn(α,γ)^(116)Te reaction was investigated for different global optical model potentials,level density, and strength function models at the astrophysically interested energies. Astrophysical S factors were calculated and compared with experimental data available in the EXFOR database. The calculation with the optical model potential of the dispersive model by Demetriou et al., and the back-shifted Fermi gas level density model and Brink-Axel Lorentzian strength function model best served to reproduce experimental results at an astrophysically relevant energy region. The reaction rates were calculated with these model parameters at the p process temperature and compared with the current version of the reaction rate library Reaclib and Starlib.

关键词：核反应模型天体物理学截面计算能量范围光学模型势模型参数计算函数模型能级密度

Some studies on transient behaviours of sheath formation in dusty plasma with the effect of adiabatically heated electrons and ions

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Plasma Science and Technology 2017年第9期19卷 35-40页

作者： G c DAS Gyan Darshan Academy VIP RoadGuwahati-781022India

Based on quasipotential analysis, a plasma sheath is studied through the derivation of the Sagdeev potential equation in dusty plasma coexisting with adiabatically heated electrons and ions. Salient features as to the existence of sheaths are shown by solving the Sagdeev potential equation through the Runge–Kutta method, with appropriate consideration of adiabatically heated electrons and ions in the dynamical system. It has been shown that adiabatic heating of plasma sets a limit to the critical dust speed depending on the densities and Mach number, and it is believed that its role is very important to the sheath. One present problem is the contraction of the sheath region whereby dust grains levitated into the sheath lead to a crystallization similar to the formation of nebulons and are compressed to a larger chunk of the dust cloud by shrinking of the sheath. Our overall observations advance knowledge of sheath formation and are expected to be of interest in astroplasmas.

关键词： sheath heated dynamical Kutta Runge derivation shrinking coexisting grains compressed

Evaluation of the colorectal cancer risk conferred by rare UNc5c alleles

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World Journal of Gastroenterology 2014年第1期20卷 204-213页

作者： Sébastien Küry céline Garrec Fabrice Airaud Flora Breheret Virginie Guibert cécile Frenard Shuo Jiao Dominique Bonneau Pascaline Berthet céline Bossard Olivier Ingster Estelle cauchin Stéphane Bezieau cHU Nantes Service de Génétique Médicale44093 Nantes CEDEX 1France Public Health Sciences Division Fred Hutchinson Cancer Research CenterSeattleWA 98109United States cHU Angers Service de Génétique Médicale4 rue Larrey49933 AngersFrance centre de Lutte contre le cancer Fran?ois Baclesse 3 avenue du Général Harris14076 Caen Cedex 5France Université de Nantes Faculté de Médecine de NantesEA 4273 NantesFrance cHU Nantes Institut des Maladies de l’Appareil Digestif et Service d’Hépato-Gastroentérologie44093 Nantes Cedex 1France

AIM: To evaluate the risk associated with variants of the UNc5c gene recently suspected to predispose to familial colorectal cancer (cRc).

关键词： colorectal cancer UNc5c Genetic predisposition Familial study Association study Low risk

Assays for RNA synthesis and replication by the hepatitis c virus

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Frontiers in Biology 2012年第3期7卷 233-245页

作者： c. cheng KAO Baochang FAN Sreedhar cHINNASWAMY Hui cAI c.T. RANJITH-KUMAR Jerome DEVAL Department of Molecular & cellular Biochemistry Indiana University Bloomington IN 47405 USA National Institute of Biomedical Genomics (NIBMG) NSS Kalyani WB-74125L India Alios BioPharma lnc. South San Francisco CA 94080 USA

At least six major genotypes of Hepatitis c virus （HcV） cause liver diseases worldwide. The efficacy rates with current standard of care are about 50% against genotype 1, the most prevalent strain in the United States, Europe and Japan. Therefore more effective pan-genotypic therapies are needed. HcV RNA replication provides a number of validated targets for virus-specific and potentially pan-genotypic inhibitors. In vitro assays capturing the different steps of RNA synthesis are needed not only to identify new inhibitors, but also to examine their mechanisms of action. This review attempts to provide a comprehensive summary of the biochemical, cell-based and animal model systems to assess HcV polymerase activity and HcV RNA replication that should be useful for both basic research and applied studies.

关键词： assay RNA synthesis and replication hepatitis c virus

Apolipoprotein E polymorphism influences orthotopic liver transplantation outcomes in patients with hepatitis c virus-induced liver cirrhosis

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World Journal of Gastroenterology 2021年第11期27卷 1064-1075页

作者： José carlos Rodrigues Nascimento Lianna c Pereira Juliana Magalhães c Rêgo Ronaldo P Dias Paulo Goberlânio B Silva Silvio Alencar c Sobrinho Gustavo R coelho Ivelise Regina c Brasil Edmilson F Oliveira-Filho James S Owen Pierluigi Toniutto Reinaldo B Oriá Department of Anesthesia and Surgery Liver Transplantation Fortaleza General HospitalFortaleza 60150-160CEBrazil Laboratory of the Biology of Tissue Healing Ontogeny and NutritionDepartment of Morphology and Institute of BiomedicineSchool of MedicineFederal University of CearáFortaleza 60430-270CEBrazil Department of Dental clinic Federal University of CearáFortaleza 60430-270CEBrazil Department of Surgery Liver Transplant Unit of Federal University of CearáFortaleza 60430-270CEBrazil Transplantation Division Hospital Geral de FortalezaFortaleza 60175-742CEBrazil Institute of Virology CharitéUniversitätsmedizin BerlinBerlin 10117Germany UcL Medical School Royal Free CampusLondon NW32PFUnited Kingdom Department of Specialized Medicine Hepatology Liver Transplantation UnitAzienda Sanitaria Universitaria Integrata of UdineUdine I-33100Italy

BAcKGROUND Hepatitis c virus(HcV)infection is responsible for a chronic liver inflammation,which may cause end-stage liver disease and hepatocellular *** E(protein:ApoE,gene:APOE),a key player in cholesterol metabolism,is mainly synthesized in the liver and APOE polymorphisms may influence HcV-induced liver *** To determine whether APOE alleles affect outcomes in HcV-infected patients with liver cirrhosis following orthotopic liver transplantation(OLT).METHODS This was a cohort study in which 179 patients,both genders and aged 34-70 years,were included before or after(up to 10 years follow-up)*** injury severity was assessed using different criteria,including METAVIR and models for endstage liver *** polymorphisms were analyzed by quantitative real-time polymerase chain *** The APOE3 allele was the most common(67.3%).In inflammation severity of biopsies from 89 OLT explants and 2 patients in pre-transplant,the degree of severe inflammation(A3F4,0.0%)was significantly less frequent than in patients with minimal and moderate degree of inflammation(≤A2F4,16.2%)P=0.048,in patients carrying the APOE4 allele when compared to *** addition,a significant difference was also found(≤A2F4,64.4%vs A3F4,0.0%;P=0.043)and(A1F4,57.4%vs A3F4,0.0%;P=0.024)in APOE4 patients when compared to APOE3 *** fibrosis degree of the liver graft in 8 of 91 patients and the lack of the E4 allele was associated with more moderate fibrosis(F2)(P=0.006).cONcLUSION Our results suggest that the E4 allele protects against progression of liver fibrosis and degree of inflammation in HcV-infected patients.

关键词： Apolipoprotein E Polymorphism Liver cirrhosis Hepatitis c virus Hepatocellular carcinoma Liver transplantation