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Twin Growth and Texture Evolution in an Extruded AM30 Magnesium Alloy during Compression

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Journal of Materials Science & Technology 2014年第9期30卷 884-887页

作者： d.Sarker J.Friedman d.L.Chen department of Mechanical and Industrial Engineering Ryerson University 350 Victoria StreetTorontoOntario M5B 2K3 Canada

The aim of this study was to examine and quantify the growth of extension twins and the associated texture change in an extruded AM30 magnesium alloy during compression along the extrusion direction. Three stages of twin growth with increasing strain were observed due to twin-dislocation interactions, together with increasing texture volume fraction of {1210}〈0001〉 and {01- 10}〈0001〉 components. Stage I was characterized by a relatively slow and gradually accelerating growth. A steady-state twin growth was reached in stage II, where the twin width increased linearly with increasing strain. Stage III twin growth became decelerated, exhibiting a plateau-like character.

关键词： Magnesium alloy Compressive deformation Twinning Twin growth Texture

Monitoring of rhythms in laset speckle data

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Journal of Innovative Optical Health Sciences 2014年第3期7卷 73-82页

作者： d.E.Postnov A.Y.Neganova d.d.Postnov A.R.Brazhe Physics department Saratov State University Astrakhanskaya St.83Saratov 410012Russia Biophysics department Biological FacutyMoscow State UniversityLeninskie Gory 1Building 12119991 MoscowRussia

While the laser speckle imaging(LSI)is a powerful tool for multiple biomedical applications,suchas monitoring of the blood flow,in many cases it can provide additional information when combined with spatio-temporal rhythm *** demonstrate the application of GraphicsProcessing Units(GPU)-based rhythm analysis for the post procesing of LSI data,discuss therelevant structure of GPU-based computations,test the proposed technique on surrogate 3d data,and apply this approach to kidney blood fiow *** with surrogate data demonstrate the ability of the method to extract information about oscillation patterns fromnoisy data,as well as to detect the moving source of the *** analysis of kidney dataallow us to detect and to localize the dymamics arising from autoregulation processes at the levelof individual nephrons(tubuloglomerular feedback(TGF)rhythm),as well as to distinguishbetween the TGF-active and the TGF-silent zones.

关键词： Laser speckle imaging wavelet transform kidney autoregulation.

Optimization Study of the Efficient Spindle

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Journal of Thermal Science 2008年第3期17卷 243-246页

作者： Y.d.Kim d.H.Chun M.S.Kang H.d.Kim Korea Textile Machinery Research Institute School of Textiles Yeungnam University School of Mechanical Engineering Andong National University

In the field of yarn dyeing, the most generally employed method is a type of package dyeing which uses a package of cheese stacked on a spindle made of a perforated tube. Spindles up to now, have been designed without considering the characteristics of dyeing liquid, focusing only on the geometric configuration which cause many problems such as lack of level dyeing. To improve the level dyeing and find the appropriate spindle configuration for the most effective dyeing process, this study examines the spindle flow-field in detail, using a computational method. Flow characteristics inside the spindle have been investigated with varying in porosity, porous diameter and the velocity of the flow. The results show that the total pressure of the flow through the spindle is used to overcome body force. The characteristics of the flow from the porous spindle could also be observed. Based on the results from this study, an effective spindle configuration for level-dyeing has been proposed.

关键词： Porosity Spindle Yarn dyeing Computational Fluid dynamics

Electron Structure and Microwave Absorbing Ability of Flaky FeSiAl Powders

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Journal of Materials Science & Technology 2011年第2期27卷 170-174页

作者： T.d.Zhou d.F.Liang L.J.deng d.C.Luan Xihua University Chengdu 610039China State Key Laboratory of Electronic Thin Films & Integrated devices University of Electronic Science and Technology of ChinaChengdu 610054China

Soft magnetic metallic materials have been widely used for absorbing electromagnetic *** Fe 86 t Si t Al 14（t=9,11,14 and 16） alloys powders were prepared from melt-quenched ribbons by annealing and *** a previous report we discussed the order-disordered structure of this *** this article,we studied their electron *** electron numbers of（111） and（100） plane increase with increasing Si content but Bohr magneton *** permittivity and complex permeability are both decreased with increasing Si content *** lowest value of reflectivity among the four alloys is originated from Fe 70 Si 14 Al *** peak values of reflectivity are all lower than 10 dB,and the absorbing frequency range（R 10 dB） increases from 1 to 2 GHz when t reaches 16.

关键词： Flaky powders Specific saturation magnetism Bohr magneton Absorbing ability

de-twinning and Texture Change in an Extruded AM30 Magnesium Alloy during Compression along Normal direction

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Journal of Materials Science & Technology 2015年第3期31卷 264-268页

作者： d.Sarker J.Friedman d.L.Chen department of Mechanical and Industrial Engineering Ryerson University

Twinning and de-twinning are the salient deformation mechanisms in hexagonal close-packed(hcp)metals. The aim of this study was to examine and quantify the de-twinning process involving a reversible motion of twin boundaries in an extruded AM30 magnesium alloy after re-compression along the normal direction(Nd) of pre-compressed samples along the extrusion direction(Ed). {1012} extension twins were first introduced at a compressive strain of 3.7% along the Ed. The subsequent compressive deformation along the Nd induced a gradual shrinkage of twins with increasing cumulative true strain,and the complete de-twinning occurred at a strain of ~7.7%. The twin width decreased linearly with increasing true strain. Texture measurements verified the rotation of c-axes of hcp unit cells towards the anti-compression direction due to {1012} extension twinning after compression along the Ed, and a gradual return of c-axes to the initial orientation due to twin shrinking or de-twinning during the following compression along the Nd. The {1012} twinning corresponded to the formation of new texture components C{1210} and d{0110} and a decrease in the initial texture components A{0001} and B{0001}, while the twin shrinking or de-twinning was characterized by a gradual vanishing of components C{1210} and d{0110} and an increase in the components A{0001} and B{0001}.

关键词： Magnesium alloy Compressive deformation Twinning d

dirac operator on the sphere with attached wires

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Chinese Physics B 2016年第4期25卷 335-338页

作者： E N Grishanov d A Eremin d A Ivanov I Yu Popov Ogarev Mordovia State University Bolshevistskaya Str. 68 Saransk Russia ITMO University Kroverkskiy pr. 49 St. Petersburg 197101 Russia

An explicitly solvable model for tunnelling of relativistic spinless particles through a sphere is suggested. The model operator is constructed by an operator extensions theory method from the orthogonal sum of the dirac operators on a semi- axis and on the sphere. The transmission coefficient is obtained. The dependence of the transmission coefficient on the particle energy has a resonant character. One observes pairs of the Breit-Wigner and the Fano resonances. It correlates with the corresponding results for a non-relativistic particle.

关键词： dirac operator nanostructure tunnelling solvable model

Coherent States for the Two-dimensional dirac-Moshinsky Oscillator Coupled to an External Magnetic Field

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Communications in Theoretical Physics 2015年第3期63卷 271-274页

作者： d.Ojeda-Guillen R.d.Mota V.d.Granados Escuela Superior de Física y Matemáticas Instituto Politécnico NacionalEd.9Unidad Profesional Adolfo López MateosC.P.07738México D.F.Mexico Escuela Superior de Ingeniería Mecánica y Eléctrica Unidad CulhuacánInstituto Politécnico NacionalAv.Santa Ana No.1000Col.San Francisco CulhuacánDelegación CoyoacánC.P.04430Mexico D.F.Mexico

We show that the（2＋1）-dimensional dirac-Moshinsky oscillator coupled to an externa/ magnetic field can be treated algebraically with the SU（1,1） group theory and its group *** use the su（1,1） irreducible representation theory to find the energy spectrum and the ***,with the su（1,1） group basis we construct the relativistic coherent states in a closed form for this problem.

关键词： Lie algebras coherent states dirac equation dirac-Moshinsky oscillator

Logarithmic Regge pole

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Chinese Physics C 2020年第10期44卷 41-50页

作者： S.d.Campos Applied Mathematics Laboratory-CCTS/dFQM Federal University of Sâo CarlosSorocabaSão Paulo CEP 18052780Brazil

This work presents the subtraction procedure and the Regge cut in the logarithmic Regge pole *** subtraction mechanism leads to the same asymptotic behavior as previously obtained in the non-subtraction *** Regge cut,in contrast,introduces a clear role to the non-leading contributions for the asymptotic behavior of the total *** these results,some simple parameterization is introduced to fit the experimental data for the proton-proton and antiproton-proton total cross-section above some minimum value up to the *** fit parameters obtained are used to present predictions for the ρ(s)-parameter as well as to the elastic slope B(s)at high energies.

关键词： Regge pole double pomeron ρ-parameter total cross section

An overview of the anti-SARS-CoV-2 properties of Artemisia annua, its antiviral action, protein-associated mechanisms, and repurposing for COVId-19 treatment

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Journal of Integrative Medicine 2021年第5期19卷 375-388页

作者： Andrea d.Fuzimoto Holistic Sync-Holistic Integrative Medicine USA/Brazil

Artemisia annua and its phytocompounds have a rich history in the research and treatment of malaria,rheumatoid arthritis, systemic lupus erythematosus, and other diseases. Currently, the World Health Organization recommends artemisinin-based combination therapy as the first-line treatment for multi-drug-resistant malaria. due to the various research articles on the use of antimalarial drugs to treat coronaviruses, a question is raised: would A. annua and its compounds provide anti-severe acute respiratory syndrome coronavirus-2(SARS-CoV-2) properties? PubMed/MEdLINE, Scopus, and Google Scholar were searched for peer-reviewed articles that investigated the antiviral effects and mechanisms of A. annua and its phytochemicals against SARS-CoVs. Particularly, articles that evidenced the herb’s role in inhibiting the coronavirus-host proteins were favored. Nineteen studies were retrieved. From these,fourteen in silico molecular docking studies demonstrated potential inhibitory properties of artemisinins against coronavirus-host proteins including 3 CL^(PRO), S protein, N protein, E protein, cathepsin-L, helicase protein, nonstructural protein 3(nsp3), nsp10, nsp14, nsp15, and glucose-regulated protein 78 ***, A. annua constituents may impede the SARS-CoV-2 attachment, membrane fusion, internalization into the host cells, and hinder the viral replication and transcription process. This is the first comprehensive overview of the application of compounds from A. annua against SARS-CoV-2/coronavirus disease 2019(COVId-19) describing all target proteins. A. annua’s biological properties, the signaling pathways implicated in the COVId-19, and the advantages and disadvantages for repurposing A. annua compounds are discussed. The combination of A. annua’s biological properties, action on different signaling pathways and target proteins, and a multi-drug combined-therapy approach may synergistically inhibit SARS-CoV-2 and assist in the COVId-19 treatment. Also, A

关键词： COVId-19 SARS-CoV-2 Artemisia annua Artemisinin Main protease Spike protein