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Hydroxyapatite-containing PEO-coating design for biodegradable Mg-0.8Ca alloy: Formation and corrosion behaviour

Journal of Magnesium and Alloys 2023年第12期11卷 4468-4484页

作者： A.s.Gnedenkov s.L.sinebryukhov V.s.Filonina s.V.Gnedenkov Institute of Chemistry of FEB RAs 159 Pr.100-letiya VladivostokaVladivostok690022Russian Federation

In this study, the biocompatible protective coating was formed using plasma electrolytic oxidation(PEO) on bioresorbable Mg-0.8Ca alloy. The composition of the formed coating was studied using XRD, sEM-EDX analysis, and micro-Raman spectroscopy. The uniform distribution of hydroxyapatite over the thickness of protective PEO-layer was established. Using traditional(EIs, PDP, OCP) and local scanning electrochemical methods(sVET, sIET with H^(+)-selective microelectrode), the level of protective properties of PEO-layer in a biological environment(mammalian cell culture medium, MEM) was determined. It was established that modification of Mg-0.8Ca alloy surface by PEO contributes to a significant increase in the corrosion resistance of the surface layer, making it possible to control the process of material‘s biodegradation. The maximum local electrochemical activity was recorded after 72 h of testing, while for the uncoated sample,intense corrosion degradation was recorded in the first 12 min of exposure to the cell culture medium. Formation of the PEO-coating results in a twofold decrease in the corrosion current density(2.8·10^(-6)A cm^(-2)) and an increase in the impedance modulus measured at a low frequency(1.7·10^(4)Ω cm^(2)) in comparison with the uncoated material(9.5·10^(-6)A cm^(-2);8.1·10^(3)Ω cm^(2)). The mechanism of material bioresorption was established and a model for biodegradation process of Mg-0.8Ca alloy with hydroxyapatite-containing PEO-coating in MEM was proposed. Analysis of these results and comparing with others obtained by various scientific groups indicate the prospects for application of biocompatible PEO-coating on Mg-Ca alloy in implant surgery.

关键词： Magnesium-calcium alloy Biodegradation Implant surgery Plasma electrolytic oxidation Electrochemistry Minimum essential medium Hydroxyapatite

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化学药生产的实时监测

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实验与分析 2012年第6期 26-27页

作者： Tanya Jenkins Ernie hillier 黄静沃特世(米尔福德)公司沃特世科技(上海)有限公司

具有高分辨、高灵敏度和高通量等优势的超高效液相色谱技术（UPLC）．特别适合监控流动反应及开发优化条件。本文以DMF体系升温条件下向3．4-二氟硝基苯中加入吗啉的流动反应为例，通过对反应体系流出液取样和监测，

关键词：实时监测高效液相色谱技术生产化学流动反应二氟硝基苯优化条件高灵敏度

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Oriented colloidal-crystal thin films of polystyrene spheres via spin coating

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Journal of semiconductors 2015年第2期36卷 10-17页

作者： s.s.shinde s.Park Korea Research Institute of standards and science

We developed a simple and inexpensive synthesis of a large-scale close-packed monolayer of polystyrene sphere arrays, which have a variety of applications. The influence of three step spin speeds, spinning time, solution quantity and relative humidity is studied in order to achieve a large area close-packed monolayer. A relatively high surface coverage and uniform monolayer of Ps spheres in the range of 85%-90% are achieved by appropriate control of the preparative parameters. Also the effect of the oxygen plasma etching process on the reduction of Ps spheres has been studied. We conclude that it can be useful in industrial applications, because of the fabrication speed, surface coverage, control over Ps spheres and cost of the process.

关键词： monolayer Ps spheres oxygen plasma

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ＯＮＴＨＥＣＯＮＥＣＴＩＯＮＩＮＦＩＮＳＬＥＲＳＰＡＣＥ

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Chinese Annals of Mathematics,series B 2002年第2期23卷 181-186页

作者： s.s.CHERN Nankai Institute ofMathematics

A simple derivation of the Connection in Finsler space.

关键词： Finsler space Connection Riemann-Finsler geometry

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Identification of differentially expressed genes of primary spermatocyte against round spermatid isolated from human testis using the laser capture microdissection technique

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Cell Research 2004年第6期14卷 507-512页

作者： s.s.KOIDE 1230 York Avenue Center for Biomedical Research Population Council NY 10021 New York UsA

The method of laser capture microdissection (LCM) combined with suppressive subtractive hybridization (ssH) was developed to isolate specific germ cells from human testis sections and to identify the genes expressed during differentiation and development. In the present study, over 10,000 primary spermatocytes and round spermatid cells were successfully isolated by LCM. Using the cDNAs from primary spermatocytes and round spermatids, ssH cDNAs library of primary spermatocyte-specific was constructed. The average insert size of the cDNA isolated from 75 randomly picked white clones was 500 bp, ranging from 250 bp to 1.7 kb. Using the dot-blot method, a total of 421 clones were examined, resulting in the identification of 390 positive clones emitting strong signals. Partial sequence of cDNAs prepared from each clone was determined with an overall success rate of 84.4%. Genes encoding cytochrome c oxidase II and the rescue factor-humanin were most frequently expressed in primary spermatocytes, suggesting th

关键词： laser capture microdissection suppressive subtractive hybridization spermatogenesis cytochrome c oxidase Ⅱ humanin.

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遥测站的实时潮汐数据收集

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水利水文自动化 1998年第4期 30-32页

作者： G.hillier 乐子华

Wimpol有限公司为伦敦港务局(PLA)安装了一个潮汐数据采集和处理系统。 Polatide系统用来替代一个通过闭路电话摄象观测的、记录纸式的潮汐记录网络。该系统安装在POLARIs(伦敦港务局河流信息系统)附近,此处已安装了一个导航雷达显示系... 详细信息

Wimpol有限公司为伦敦港务局(PLA)安装了一个潮汐数据采集和处理系统。 Polatide系统用来替代一个通过闭路电话摄象观测的、记录纸式的潮汐记录网络。该系统安装在POLARIs(伦敦港务局河流信息系统)附近,此处已安装了一个导航雷达显示系统,这两个系统都是用来改善泰晤士河上的航运安全和导航控制的。 Polatide应用Wimpol公司的“入口点”遥测系统。

关键词：遥测站潮汐数据收集数据处理

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Nanocrystallization of α-Fe Crystals in Fe_(52)Cr_(18)Mo_7B_(16)C_4Nb_3 Bulk Amorphous Alloy

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Journal of Materials science & Technology 2011年第6期27卷 497-502页

作者： s. Ahmadi H.R. shahverdi s.s. saremi Faculty of Engineering Department of Materials Science Tarbiat Modares University

Crystallization kinetics of Fe52Cr18Mo7B16C4Nb3 alloy was evaluated by X-ray diffraction（XRD）,differential scanning calorimetric（DsC） tests and transmission electron microscopy（TEM） observations in this research *** effect,crystallization and growth mechanism were investigated by using DsC tests at four different heating rates（10,20,30,40 K/min）.Results showed that a two-step crystallization process occurred in the alloy in which α-Fe and Fe3B phases were crystallized,respectively in the structure after heat *** energy for the first step of crystallization,i.e.α-Fe was measured to be 421 and 442 kJ/mol according to Kissinger-starink and Ozawa models,***,Avrami exponent calculated from DsC curves was 1.6 and a two-dimensional diffusion controlled growth mechanism with decreasing nucleation rate was observed in the ***,it was known from the TEM observations that crystalline α-Fe phase nucleated in the structure of the alloy in an average size of 10 nm and completely mottled morphology.

关键词： Bulk metallic glasses (BMGs) structural amorphous steels (sAss) Avrami exponent Crystallization and kinetic models

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Effects of Nb Alloying on Nano-Crystallization Kinetics of Fe_(55-x)Cr_(18)Mo_7B_(16)C_4Nb_x(x=0, 3) Bulk Amorphous Alloys

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Journal of Materials science & Technology 2011年第8期27卷 735-740页

作者： s. Ahmadi H.R. shahverdi s.s. saremi Faculty of Engineering Department of Materials Science Tarbiat Modares University

Crystallization kinetics of Fe55-xCrzsMo7B10C4Nbx（x= 0, 3） bulk amorphous alloys were analyzed using X-ray diffraction and differential scanning; calorimetric （DsC） tests. In practice, crystallization and growth mechanism were evaluated using DsC tests at four different heating rates （10, 20, 30, and 40 K/rain） and kinetic models. Two-step crystallization behavior was observed when Fe55Cr18MOTB16C4 and Fe52Cr18MoTB16C4Nb3 bulk amorphous alloys were annealed, where Fe36Cr12M010 phase was crystallized in the first step of crystallization. Results show that Fe36Cr12Mo10 and Fe3C phases were crystallized in the structures of the alloys after further annealing： process. Activation energy for the crystallization of Fe36Cr12Mozo phase was measured to be 543 kJ/mol in Fe52Cr18MoTB16C4Nb3 alloy and 375 kJ/mol for Fe55Cr18Mo7B16C4 alloy according to Kissinger-starink model. Moreover, a two-dimensiona nucleation rate was found in Fe52Cr18Mo7B16C4Nb3 diffusion controlled growth mechanism with decreasing alloy whereas a three-dimensional diffusion controlled growth mechanism with decreasing nucleation rate was found in crystallization of Fe36Crz2Mo10 phase during annealing of Fe55Cr18MoTB16C4 alloy. TEM （transmission electron microscopy） observations reveal that crystalline Fe36Cr12M010 phase nucleated in the structures of the alloys in an average size of 10 nm with completely mottled morphology.

关键词： Avrami exponent Crystallization Kinetic models Growth mechanisms Bulk amorphous alloys

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Effect of Metal Contact and Rapid Thermal Annealing on Electrical Characteristics of Graphene Matrix

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Chinese Physics Letters 2017年第10期34卷 65-69页

作者： s, Fahad M. Ali s. Ahmed s. Khan s. Alam s. Akhtar Advanced Electronics Laboratories International Islamic University Islamabad Pakistan Department of Physics Federal Urdu University of Arts Sciences & Technology Karachi Pakistan

Development of graphene field effect transistors （GFETs） faces a serious challenge of graphene interface to the dielectric material. A single layer of intrinsic graphene has an average sheet resistance of the order of 1-5 kΩ/□. The intrinsic nature of graphene leads to higher contact resistance yielding into the outstanding properties of the material. We design a graphene matrix with minimized sheet resistance of 0.185 kΩ/□ with Ag contacts. The developed matrices on silicon substrates provide a variety of transistor design options for subsequent fabrication. The graphene layer is developed over 400 nm nickel in such a way as to analyze hypersensitive electrical properties of the interface for exfoliation. This work identifies potential of the design in the applicability of few-layer GFETs with less process steps with the help of analyzing the effect of metal contact and post-process anneMing on its electrical fabrication.

关键词： Effect of Metal Contact and Rapid Thermal Annealing on Electrical Characteristics of Graphene Matrix

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Application of integrated simulation environment sIEMNED to the analysis of the MEPHIsT-0 tokamak operation

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Plasma science and Technology 2023年第3期25卷 222-233页

作者： D Yu sYCHUGOV s Yu sOLOVIEV A s ZHILKIN A V MELNIKOV s A KRAT Faculty of Computational Mathematics and Cybernetics Lomonosov Moscow State University National Research Centre Kurchatov Institute National Research Nuclear University Moscow Engineering Physics Institute National University Moscow Institute of Physics and Technology

This paper presents the results of numerical simulation of plasma equilibrium and stability in the MEPHIsT-0 tokamak with sIEMNED software and comparison of simulation results with *** determined characteristics of the vacuum chamber show that it significantly affects the entire *** various scenarios of the inductor operation,a comparison of experimental data and simulated currents and magnetic fields induced in the chamber was carried *** steady-state tokamak operation,a numerical study of equilibrium plasma configurations was carried out depending on the currents in the poloidal magnetic field coils and plasma *** vertical plasma instability was *** limiting values of plasma ellipticity preventing the vertical plasma instability were numerically *** simulations show that plasma equilibrium is supported by induced *** was shown numerically that magnetic configuration with‘zero of higher order’were obtained before the plasma shot,suggesting consistency between the simulation results and observations.

关键词： mathematical modelling tokamak installation MEPHIsT-0

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