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Titanate incorporated anodized coating on magnesium alloy for corrosion protection,antibacterial responses and osteogenic enhancement

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Journal of Magnesium and Alloys 2022年第4期10卷 1109-1123页

作者： saranya.K Bhuvaneswari.s suvro Chatterjee Rajendran.N Department of Chemistry College of Engineering Guindy CampusAnna UniversityChennaiTamil Nadu 600025India Vascular Biology Lab AU-KBC Research CentreAnna UniversityChromepetChennaiTamil Nadu 600044India

The rapid degradation of Mg alloy was reduced by incorporating titanate on a fluorine-based anodized *** coating shows(i)excellent biomineralization ability,(ii)improved local and periodical corrosion behavior and(iii)enhanced expression of osteogenic factors(Runx2,Col 1,OCN and OPN)along with(iv)the antibacterial *** fluoride and magnesium ions dissolution from the anodized layer is responsible for the better expression of osteogenic factors and antibacterial *** preparation of the titanate incorporated anodized Mg alloy(Ti-AMg)is a facile solution to overcome the implant-associated bacterial infections with required biological functions including progression of bone ingrowth and biocompatibility.

关键词： AZ31 Magnesium alloy Titanate Anodization Localized electrochemical impedance spectroscopy Osteogenic factor Anti-bacterial

High-mobility two-dimensional electron gases at oxide interfaces:Origin and opportunities

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Chinese Physics B 2013年第11期22卷 1-11页

作者：陈允忠 Nini Pryds 孙继荣沈保根 sФren Linderoth Department of Energy Conversion and storage Technical University of Denmark Ris Campus Beijing National Laboratory for Condensed Matter Physics State Key Laboratory for Magnetism Institute of Physics Chinese Academy of Sciences

Our recent experimental work on metallic and insulating interfaces controlled by interfacial redox reactions in srTiO3-based heterostructures is reviewed along with a more general background of two-dimensional electron gas （2DEG） at oxide interfaces. Due to the presence of oxygen vacancies at the srTiO3 surface, metallic conduction can be created at room temperature in perovskite-type interfaces when the overlayer oxide ABO3 has Al, Ti, Zr, or Hf elements at the B sites. Furthermore, relying on interface-stabilized oxygen vacancies, we have created a new type of 2DEG at the heterointerface between srTiO3 and a spinel γ-Al2O3 epitaxial film with compatible oxygen ion sublattices. This 2DEG exhibits an electron mobility exceeding 100000 cm2·V-1·s-1, more than one order of magnitude higher than those of hitherto investigated perovskite-type interfaces. Our findings pave the way for the design of high-mobility all-oxide electronic devices and open a route toward the studies of mesoscopic physics with complex oxides.

关键词： oxide interfaces two-dimensional electron gas (2DEG) srTiO3 oxygen vacancies

Application of a characterized difference-frequency laser source to carbon monoxide trace detection

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Chinese Physics B 2012年第6期21卷 257-263页

作者： Alireza Khorsandi Zahra shabani Monireh Ranjbar s. Ali Hoseinzadeh salati Department of Physics University of Isfahan81746-73441 IsfahanIran

A tunable continuous wave（cw） mid-infrared（MIR） laser based on difference-frequency generation（DFG） in a 1.5-cm long AgGas2 nonlinear crystal for trace gas detection is *** visible and near-infrared diode lasers were used as pump and signal *** MIR-DFG laser was tunable in a wavelength range of 4.75 μm-4.88 μ*** phase-matching（PM） condition was non-critically achieved by adjusting the temperature of the crystal for fixed pairs of input pump and signal *** required PM temperatures of the generated MIR-DFG wavelengths have been calculated by using three sets of recent sellmeier equations and the temperature-dispersion equations of AgGas2 given by Willer U,et al.（Willer U,Blanke T and schade W 2001 ***.40 5439）.Then the calculated PM temperatures are compared with the experimental *** performance of the MIR-DFG laser is shown by the trace detection of the P（16） carbon monoxide（12C16O） absorption line in a laboratory-fabricated absorption *** enhanced sensitivity of about 0.6×10 4 was obtained through the long path absorption provided by consecutive reflections between coated cylindrical mirrors of a constructed cell.

关键词： difference-frequency generation AgGas2 crystal multi-pass cell

Analytical and approximate solutions of nonlinear schrödinger equation with higher dimension in the anomalous dispersion regime

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Journal of Ocean Engineering and science 2022年第2期7卷 143-154页

作者： Lanre Akinyemi Mehmet senol M.s.Osman Department of Mathematics Lafayette CollegeEastonPAUSA Nev¸s ehir HacıBekta¸s Veli University Department of MathematicsNev¸s ehirTurkey Department of Mathematics Faculty of ScienceCairo UniversityGiza 12613Egypt

The generalized Riccati equation mapping method(GREMM)is used in this paper to obtain different types of soliton solutions for nonlinear schrödinger equation with higher dimension that existed in the regimes of anomalous ***,we use the q-homotopy analysis method combined with the Laplace transform(q-HATM)to obtain approximate solutions of the bright and dark optical *** q-HATM illustrates the solutions as a rapid convergent *** addition,to show the physical behavior of the solutions obtained by the proposed techniques,the graphical representation has been provided with some parameter *** findings demonstrate that the proposed techniques are useful,efficient and reliable mathematical method for the extraction of soliton solutions.

关键词： q-homotopy analysis method Generalized Riccati equation mapping method Laplace transform

A Finite and Instantaneous screw Based Approach for Topology Design and Kinematic Analysis of 5-Axis Parallel Kinematic Machines

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Chinese Journal of Mechanical Engineering 2018年第2期31卷 66-75页

作者： Tao sun shuo-Fei Yang Tian Huang Jian s.Dai Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education Tianjin University school of Engineering The University of Warwick Centre for Robotics Research School of Natural Sciences and Mathematics King’s College London University of London

Unifying the models for topology design and kinematic analysis has long been a desire for the research of parallel kinematic machines(PKMs). This requires that analytical description, formulation and operation for both finite and instantaneous motions are performed by the same mathematical tool. Based upon finite and instantaneous screw theory, a unified and systematic approach for topology design and kinematic analysis of PKMs is proposed in this paper. Using the derivative mapping between finite and instantaneous screws built in the authors’ previous work, the finite and instantaneous motions of PKMs are analytically described by the simple and non?redundant screws in quasi?vector and vector forms. And topological and parametric models of PKMs are algebraically formulated and related. These related topological and parametric models are ready to do type synthesis and kinematic analysis of PKMs under the unified framework of screw theory. In order to show the validity of the proposed approach, a kind of two?translational and three?rotational(2T3R)5?axis PKMs is taken as example. Numerous new structures of the 2T3R PKMs are synthe?sized as the results of topology design, and their Jacobian matrix is obtained easily for parameter optimization and performance evaluation. some of the synthesized PKMs have outstanding capabilities in terms of large workspaces and flexible orientations, and have great potential for industrial applications of machining and manufacture. Among them, METROM PKM is a typical example which has attracted a lot of attention from global companies and already been developed as commercial products. The approach is a general and unified approach that can be used in the innovative design of different kinds of PKMs.

关键词： Innovative design Parallel kinematic machines screw theory Finite screw Instantaneous screw

Novel kinetic model for the simulation analysis of the butanol productivity of Clostridium acetobutylicum ATCC 824 under different reactor configurations

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Chinese Journal of Chemical Engineering 2018年第4期26卷 812-821页

作者： Hugo I.Velázquez-sánchez Ricardo Aguilar-López Center of Research and Advances studies of the National Polytechnic Institute (CINVEsTAV) Biotechnology and Bioengineering DepartmentAv. National Polytechnic Institute 2508 Col. San Pedro Zacatenco

Acetone–butanol–ethanol(ABE)fermentation process can be exploited for the generation of butanol as biofuel,however it does need to overcome its low volumetric solvent productivity before it can commercially compete with fossil fuel *** this regard,mathematical modelling and simulation analysis are tools that can serve as the base for process engineering development of biological *** this work,a novel phenomenological kinetic model of Clostridium acetobutylicum ATCC 824 was considered as a benchmark system to evaluate the behaviour of an ABE fermentation under different process configurations using both free and immobilized cells:single stage batch operation,fed-batch,single stage Continuous stirred Tank Reactor(CsTR)and multistage CsTRs with and without biomass *** proposed model achieved a linear correlation index r^2=0.9952 and r^2=0.9710 over experimental data for free and immobilized cells *** predicted maximum butanol concentration and productivity obtained were 13.08 g·L^(-1)and 1.9620 g·L^(-1)·h^(-1)respectively,which represents an increase of 1.01%and 990%versus the currently developed industrial scale process reported currently into the *** results provide a reliable platform for the design and optimization of the ABE fermentation system and showcase the adequate predictive nature of the proposed model.

关键词： Biofuels Butanol Clostridium acetobutylicum Mathematical modelling Process configurations

Compton profiles of NiO and TiO_2 obtained from first principles GWA spectral function

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Chinese Physics B 2016年第6期25卷 407-415页

作者： s M Khidzir M F M Halid W A T Wan Abdullah Department of Physics Universiti of Malaya

In this work,we first use momentum density studies to understand strongly correlated electron behavior,which is typically seen in transition metal *** observe that correlated electron behavior as seen in bulk NiO is due to the Fermi break located in the middle of overlapping spectral functions obtained from a GW（G is Green’s function and W is the screened Coulomb interaction） approximation（GWA） calculation while in the case of TiO2 we can see that the origin of the constant momentum distribution in lower momenta is due to a pile up of spectra before the Fermi *** observations are then used to compare our calculated Compton profiles with previous experimental studies of Fukamachi and *** calculations for NiO are observed to follow the same trend as the experimental profile but it is seen to have a wide difference in the case of TiO2 before the Fermi *** ground state momentum densities differ significantly from the quasiparticle momentum density,thus stressing the importance of the quasiparticle wave function as the input for the study of charge density and the electron localization *** we perform a calculation of the quasiparticle renormalization function,giving a quantitative description of the discontinuity of the GWA momentum density.

关键词： elastic and Compton scattering density functional theory local density approximation gradient and other corrections elements oxides nitrides borides carbides chalcogenides

A New Process for Titanium Aluminides Production from TiO_2

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Journal of Materials science & Technology 2007年第3期23卷 367-372页

作者： A.R.Kamali H.Razavizadeh s.M.M.Hadavi Department of Materials and Metallurgy Engineering IUsT University Department of Chemical and Materials Engineering Maleke Ashtar University

This paper describes a new process for producing titanium aluminides, in particular TiAl, from TiO2 raw material. On the basis of obtained results, the non-completed reaction of TiO2 with Al and Ca in a special reaction vessel results in the production of granulates of titanium aluminides especially Ti3Al and other Ti- Al phases as the metallic product and Ca12Al14O33 as the non-metallic product. By adding KClO4 in the mixture, a nearly completed reaction can be carried out. The products of this reaction are titanium aluminide particularly TiAl as the metallic part and CaAl4O7 （grossite） as the non-metallic slag part. Both product and slag are produced in a separated form. This process, called KRH-method is described in this article. The scanning electron microscopic microstructure of metallic part of the product shows different phases： the matrix phase is TiAI, where the needle form precipitation is TiAl2 and the plate form precipitation includes TiAI and Ti3Al phases. The microstructure of the remelted metallic part indicates dendritic phase with a lamellar structure comprising of TiAl and Ti3Al phases. The interdendritic phase of TiAI is also seen.

关键词： Titanium aluminide Titanium dioxide Grossite KRH process

Analysis and formulation of spur gear stresses with different tip modifications

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Journal of Central south University 2019年第9期26卷 2368-2378页

作者： A.MAPER s.KARUPPANAN s.s.PATIL Department of Mechanical Engineering Universiti Teknologi PETRONASBandar Seri Iskandar 32610Perak Darul RidzuanMalaysia Department of Mechanical Engineering Manipal University JaipurJaipur 303007RajasthanIndia

spur gears are widely used in the power transmission mechanism of several *** to the transmitted torque,spur gears experience high stresses which could cause gear tooth failure by surface pitting or root *** relief and other gear profile modification have been considered for reducing the induced stresses in the gear *** this work,the influence of tip relief on stresses on a pair of identical spur gear was analyzed using commercial FEA software ANsYs,and formulae for estimating contact and bending stresses were *** cases of gear sets were analyzed;a non-modified pair and another two sets with linear and parabolic tip relief *** non-modified gear set frictionless contact stress was validated against the calculated AGMA pitting resistance,Hertzian contact stress and a reported contact stress value in the *** four methods agreed well with each ***,bending stress was also compared with the AGMA bending strength and Lewis bending stress for ***,friction coefficient was varied from 0.0 to 0.3 with increment of *** gear contact stress increased up to 11%relative to the frictionless case,whereas bending stress decreased by 6%.Linear tip relief modification was carried out for increasing normalised tip relief values of 0.25 to 1.0 with increment of *** gear frictionless contact and bending stresses decreased by a maximum of 4%and 2%,*** contact stress increased by up to 7.1%and the bending stress is almost identical with the frictionless *** tip relief was also carried out with similar normalised tip relief *** contact stress decreased by 5%while frictional contact stress increased by up to 11.5%and the bending stress is also almost identical with the frictionless ***,four formulae were introduced for estimating the contact and bending stresses for a tip modified spur gear.

关键词： gear stresses friction linear tip relief parabolic tip relief