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Effect of substrate and Annealing Temperatures on Mechanical Properties of Ti-rich NiTi Films

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Journal of Materials science & Technology 2010年第11期26卷 961-966页

作者： A.Kumar s.K.sharma s.Bysakh s.V.Kamat s.Mohan Defence Metallurgical Research Laboratory Department of Instrumentation Indian Institute of Science Central Glass and Ceramics Research Institute

The effect of substrate and annealing temperatures on mechanical properties of Ti-rich NiTi films deposited on si （100） substrates by DC magnetron sputtering was studied by *** films were deposited at two substrate temperatures viz.300 and 400 ℃.NiTi films deposited at 300 ℃ were annealed for 4 h at four different temperatures,i.e.300,400,500 and 600 C whereas films deposited at 400 ℃ were annealed for 4 h at three different temperatures,i.e.400,500 and 600 ℃.The elastic modulus and hardness of the films were found to be the same in the as-deposited as well as annealed conditions for both substrate *** a given substrate temperature,the hardness and elastic modulus were found to remain unchanged as long as the films were ***,both elastic modulus and hardness showed an increase with increasing annealing temperature as the films become *** results were explained on the basis of the change in microstructure of the film with change in annealing temperature.

关键词： NiTi thin film Annealing Nanoindentation

Aerodynamic characteristics of unsymmetrical aerofoil at various turbulence intensities

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Chinese Journal of Aeronautics 2019年第11期32卷 2395-2407页

作者： s.ARUNVINTHAN s.NADARAJA PILLAI Turbulence & Flow Control Lab School of Mechanical Engineering SASTRA Deemed University

A series of wind tunnel tests were performed to investigate the effect of turbulent inflows on the aerodynamic characteristics of the unsymmetrical airfoil at various turbulence intensities and Reynolds number. To assess the aerodynamic characteristics, surface pressure measurements were made over the unsymmetrical airfoil surface by using a simultaneous pressure scanner MPs4264 of scanivalve make. self-generated passive grids made of parallel arrays of round bars were placed at four different locations to generate various Turbulence Intensities(TI) in the wind tunnel. The location of the passive grid has been normalized in terms of considering the distance between the entry of the test section and the leading edge of the model. Based on the wind tunnel results, by comparing the baseline without grid low turbulence case TI = 0.51% with other turbulence generated cases like TI = 4.68%, 4.73%, 6.04% and 8.46% at different Reynolds number, it is found that the coefficient of lift increases with the increase in the turbulence intensity. Results also reveal that the flow featuring turbulence can effectively delay the stall characteristics of an airfoil by attaching the flow over the airfoil for an extended region. Additionally, attempts were made to understand the influence of turbulence on the aerodynamic hysteresis.

关键词： Aerodynamic efficiency Aerodynamic hysteresis Passive grid simultaneous pressure distribution Turbulence intensity

An in situ monitoring method for PECVD process equipment condition

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Plasma science and Technology 2019年第6期21卷 15-22页

作者： G KANG s AN K KIM s HONG Department of Electronic Engineering Myongji University Yongin 17058 Republic of Korea

A key to successful consistent plasma processing is maintaining a consistent process chamber condition over a certain production *** alleviate the concern,in situ process monitoring sensors are employed to investigate the plasma chamber conditions of both the deposition step with direct plasma and the cleaning step with a remote plasma *** situ sensors are optical emission spectroscopy (OEs),optical plasma monitoring sensors (OPMs),voltage current probes (Ⅵ-probes),and self-plasma OEs (sP-OEs).During the deposition,we perform the monitoring of a plasma condition associated with the applied RF power via OEs,OPMs,and a Ⅵ-*** the chamber cleaning step using a remote plasma system does not allow plasma monitoring through the sidewall because the plasma is not formed in the process chamber,thus we employed sP-OEs to monitor the by-product gas chemistry during the chamber cleaning process *** monitoring results with some useful applications,such as arc detection,part failure detection,and cleaning process chemistry analysis,are presented in this *** use of in situ sensors with proper combination can help to understand the plasma process better,to achieve more precise control of plasma processing.

关键词： in situ monitoring sensor advanced equipment control

Hydrodynamic Performance of Vertical Porous structures Under Regular Waves

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China Ocean Engineering 2013年第4期27卷 451-468页

作者： A.s.Koraim O.s.Rageh Water and Water structure Eng. Dept. Faculty of Eng. Zagazig University Irrigation and Hydraulics Dept. Faculty of Eng. El-Mansoura University

The hydrodynamic efficiency of the vertical porous structures is investigated under regular waves by use of physical models. The hydrodynamic efficiency of the breakwater is presented in terms of the wave transmission （kt）, reflection （kr） and energy dissipation （ka） coefficients. Different wave and structural parameters affecting the breakwater efficiency are tested. It is found that, the transmission coefficient （kt） decreases with the increase of the relative water depth （h/L）, the wave steepness （Hi^L）, the relative breakwater widths （B/L, B/h）, the relative breakwater height （D/h）, and the breakwater porosity （n）. The reflection coefficient （kr） takes the opposite trend of kt when D/h=l.25 and it decreases with the increasing h/L, HJL and B/L when D/h〈1.0. The dissipation coefficient （kd） increases with the increasing h/L, HilL and B/L when D/h〈_l.O and it decreases when D/h=l.25. In which, it is possible to achieve values ofkt smaller than 0.3, k~ larger than 0.5, and kd larger than 0.6 when D/h=1.25, B/h=0.6, h/L〉0.22, B/L〉O. 13, and H/L 〉0.04. Empirical equations are developed for the estimation of the transmission and reflection coefficients. The results of these equations are compared with other experimental and theoretical results and a reasonable agreement is obtained.

关键词： water waves porous breakwaters wave attenuation wave transmission wave reflection wave dissipation

Nonlinear parametric interactions in ion-implanted semiconductor plasmas having strain-dependent dielectric constants

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Chinese Physics B 2017年第1期26卷 304-309页

作者： N Yadav s Ghosh P s Malviya school of studies in Physics Vikram University Ujjain 465010 India Department of Physics Govt. J.N.S. Post Graduate College Shujalpur 465333 India

We report nonlinear parametric interactions using a hydrodynamic model of ion-implanted semiconductor plasmas having strain-dependent dielectric constants（sDDC）. High-dielectric-constant materials are technologically important because of their nonlinear properties. We find that the third-order susceptibility varies in the range 10^-14--10^-12m^2·V^-2 for ion-implanted semiconductor plasmas, which is in good agreement with previous results. It is found that the presence of sDDC in ion-implanted semiconductor plasma modifies the characteristic properties of the material.

关键词： nonlinear parametric interactions ion-implanted semiconductor plasmas strain-dependent dielectric constant

Ethyl thiosemicarbazide intercalated organophilic calcined hydrotalcite as a potential sorbent for the removal of uranium(VI) and thorium(IV) ions from aqueous solutions

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Journal of Environmental sciences 2013年第4期25卷 717-725页

作者： T.s.Anirudhan s.Jalajamony Department of Chemistry University of KeralaKariavattomTrivandrum 695 581India

This work was conducted to determine the practicability of using a new adsorbent 4-ethyl thiosemicarbazide intercalated, organophilic calcined hydrotalcite （ETsC-OHTC） for the removal of uranium （U（Ⅵ））, and thorium （Th（Ⅳ）） from water and wastewater. The FTIR analysis helped in realizing the involvement of nitrogen and sulphur atoms of ETsC in binding the metal ions through complex formation. Parameters like adsorbent dosage, solution pH, initial metal ions concentration, contact time and ionic strength, that influence adsorption phenomenon, were studied. The optimum pH for maximum adsorption of U（VI） and Th（IV） was found to be in the range 4.0-6.0. The contact time required for reaching equilibrium was 4 hr. The pseudo second-order kinetic model was the best fit to represent the kinetic data. Analysis of the equilibrium adsorption data using Langmuir, Freundlich and sips models showed that the Freundlich model was well suited to describe the metal ions adsorption. The KF values were 25.43 and 29.11 mg/g for U（Ⅵ） and Th（Ⅳ）, respectively, at 30℃. The adsorbent can be regenerated effectively from U（Ⅵ） and Th（Ⅳ） loaded ones using 0.01 mol/L HC1. The new adsorbent was quite stable for many cycles, without much reduction in its adsorption capacity towards the metals.

关键词： hydrotalcite 4-ethyl thiosemicarbazide uranium(Ⅵ) thorium(Ⅳ) adsorption.

Rheological fluid motion in tube by metachronal waves of cilia

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Applied Mathematics and Mechanics(English Edition) 2017年第3期38卷 393-410页

作者： s.MAITI s.K.PANDEY Department of Mathematical sciences Indian Institute of Technology (BHU) Department of Mathematics The LNM Institute of Information Technology

This paper presents a theoretical study of a non-linear rheological fluid transport in an axisymmetric tube by cilia. An attempt has been made to explain the role of cilia motion in the transport of fluid through the ductus efferent of the male reproductive tract. The Ostwald-de Waele power-law viscous fluid is considered to represent the rheological fluid. We analyze pumping by means of a sequence of cilia beats from rowto-row of cilia in a given row of cells and from one row of cells to the next(metachronal wave movement). For this purpose, we consider the conditions that the corresponding Reynolds number is small enough for inertial effects to be negligible, and the wavelengthto-diameter ratio is large enough so that the pressure can be considered uniform over the cross section. Analyses and computations of the fluid motion reveal that the time-average flow rate depends on ε, a non-dimensional measure involving the mean radius a of the tube and the cilia length. Thus, the flow rate significantly varies with the cilia ***, the flow rate has been reported to be close to the estimated value 6 × 10ml/h for human efferent ducts if ε is near 0.4. The estimated value was suggested by Lardner and shack(Lardner, T. J. and shack, W. J. Cilia transport. Bulletin of Mathematical Biology, 34, 325–335(1972)) for human based on the experimental observations of flow rates in efferent ducts of other animals, e.g., rat, ram, and bull. In addition, the nature of the rheological fluid, i.e., the value of the fluid index n strongly influences various flow-governed characteristics. An interesting feature of this paper is that the pumping improves the thickening behavior for small values of ε or in free pumping(?P = 0) and pumping(?P > 0) regions.

关键词： non-Newtonian fluid cilia movement metachronal wave volumetric flow flow reversal velocity at wave crest and trough

POLYMER sCAFFOLDs BEARING AZOBENZENE-POTENTIAL FOR OPTICAL INFORMATION sTORAGE

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Chinese Journal of Polymer science 2001年第2期19卷 147-153页

作者： sφren Hvilsted P.s.Ramanujam Danish Polymer Centre Chemical Engineering Department Technical University of Denmark DK-2800 Kgs. Lyngby DenmarkOptics and Fluid Dynamics Department Risφ National LaboratoryDK-4000 Roskilde Denmark

The fundamental optical storage mechanism of the laser light eddressable azobenzene moiety is briefly introduced.A modular and flexible synthesis design furnishes polyester matrices covalently integrating cyanoazobenzene in regularlyspaced side chains. Thin films of these materials are particularly well suited for holographic storape. Notable figures of meritsof liquid crystalline polyesters are response time to blue-green laser light of the order of nanoseconds, storage capacityexpressed as 5000 lines/mm, and high, permanent (almost nine years) diffraction efficiency of the order of 50% or greater,and erasability, The implications of the main chain nature for polyester morphology and for the permanency of the inducedanisotropy are discussed, The design and methods of preparation of other significantly different polymer scaffolds supportingcyanoazobenzene are elaborated. Oligopeptides always result in amorphous materials, whereas copolymethacrylates anddendritic or hyperbranched polyesters provide some materials that exhibit liquid crystallinity. However, none of these scaffolds affords materials that result in permanent anisotropy when exposed to interfering laser light.

关键词： Azobenzene side-chain polymers Copolymethacrylates Dendrimers Holographic storage LC and amorphous polyesters Morphology Oligopeptides

Experimental study on microstructural and corrosion behaviors of friction stir processed steel with CoCrFeCuTi HEA reinforcement and effect of annealing

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science China Technological sciences 2025年第1期 233-250页

作者： s.Aravind KRIsHNA N.RADHIKA Alokesh PRAMANIK N.JEYAPRAKAsH Department of Mechanical Engineering Amrita School of EngineeringAmrita Vishwa Vidyapeetham school of Civil and Mechanical Engineering Curtin University school of Mechanical and Electrical Engineering China University of Mining and Technology

The ability to perform against extreme corrosion environments in stainless steel depreciates under challenging conditions in industrial applications. This can be resolved by employing surface modification techniques to modify the surface with the required characteristics. The present study investigates the outcomes of friction stir processing of ss304 with CoCrFeCuTi high entropy alloy(HEA) as reinforcement and the property enhancements post-annealing. The synthesized CoCrFeCuTi HEA exhibited irregular fragments with 17 μm mean particle size and body centred cubic(BCC) phase. The microstructure of the processed surface revealed ultra-refined grains with a uniform distribution of HEA filler. The microstructures of the samples annealed at 400℃, 550℃, 700℃ and 850℃ for 2 h also showed significant grain growth and grain refinements. The processed sample with HEA reinforcement annealed at 700℃ exhibited enhanced microhardness and tensile strength by 63% and 0.88 times than that of the processed sample with HEA pre-annealing. The subsequent electrochemical corrosion test displayed better corrosion resistance for the HEA-processed and annealed sample. Hot corrosion tests at 900℃ showcased excellent resistance for the HEA processed and annealed samples by 14.92%, 12.75%, and 14.83% against the samples pre-annealed under three different salt mixtures, and the corroded surface was analyzed.

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