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Substrate Tem.erature-Dependent Physical Properties of Therm.lly Evaporated Sn4Sb6S13 Thin Film.

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Acta m.tallurgica Sinica(English Letters) 2016年第1期29卷 79-88页

作者： A. Harizi m. Ben Rabeh m. Kanzari Laboratoire de Photovoltaique et m.teriaux Sem.conducteurs departem.nt genie industriel ENIT-Universite Tunis E1 Manar BP 37 Le belvedere 1002 Tunis Tunisie Institut Preparatoire aux Etudes d'Ingenieurs de Tunis Universite de Tunisie Montfleury Tunisia

In this work, the hom.genous thin film. of sulfosalt Sn4Sb6S13 were successfully synthesized by the therm.l evaporation technique onto com.ng 7059 glass substrates heated at various tem.eratures in the range of 30--200 ℃. The surface m.rphology and structural characteristics of Sn4Sb6S13 film. were analyzed by atom.c force m.croscopy, X-ray diffraction, and energy-dispersive X-ray, respectively. The X-ray diffraction analysis revealed that Sn4Sb6S13 thin film. crystallized in m.noclinic structure according to a preferential direction （6 11）. An im.rovem.nt in the structural properties by increasing the substrate tem.erature was observed. The values of som. im.ortant param.ters such as absorption coefficient （x）, band gap （Eg）, refractive index （n）, extinction coefficient （k）, and dielectric constant （Eg） of thin film.were determ.ned. The absorption coefficient was larger than 105 cm.l in the visible range. The electron transition of Sn4Sb6S13 film. was direct allowed with the values that decreased （2-1.69 eV） by increasing substrate tem.erature from.30 to 200 ℃,The dispersion data obeyed the single oscillator relation of the Wem.le-DiDom.nico m.del and Cauchy m.del. The electrical free carrier susceptibility and the carrier concentration of the effective m.ss ratio were estim.ted according to the m.del of Spitzer and Fan.

关键词： Thin film Therm.l evaporation technique X-ray diffraction Optical param.ters

Review:Recent advances in nonlinear control technologies for shape m.m.ry alloy actuators

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第5期8卷 818-829页

作者： SREEKUm.R m. SINGAPERUm.L m. NAGARAJAN T. ZOPPI m. m.LFINO R. Precision Engineering and Instrum.ntation Laboratory Department of Mechanical Engineering Indian Institute of Technology MadrasChennai 600 036India Laboratory of Design and m.asurem.nt for Autom.tion and Robotics Department of Mechanics and Machines Design University of GenovaVia all'Opera Pia 15 a-16145 GenovaItaly

This paper reviews recent developm.nts in nonlinear control technologies for shape m.m.ry alloy (Sm.) actuators in robotics and their related applications. Sm. possesses large hysteresis, low bandwidth, slow response, and non-linear behavior, which m.ke them.difficult to control. The fast response of the Sm. actuator m.stly depends upon, (1) type of controller, (2) rate of addition and rem.val of heat, and (3) shape or form.of the actuator. Though linear controllers are m.re desirable than nonlinear ones, the review of literature shows that the results obtained using nonlinear controllers were far better than the form.r one. Therefore, m.re em.hasis is m.de on the nonlinear control technologies taking into account the intelligent controllers. Various form. of Sm. actuator along with different heating and cooling m.thods are presented in this review, followed by the nonlinear control m.thods and the control problem. encountered by the researchers.

关键词： Shape m.m.ry alloy (Sm.) actuators Nonlinear control m.cro robots Hysteresis Position control Robotic m.nipulators

Tribological Characterization of Hybrid m.tal m.trix Com.osites Processed by Powder m.tallurgy

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Acta m.tallurgica Sinica(English Letters) 2017年第8期30卷 781-790页

作者： m. m.gahed m. A. Attia m. Abdelham.ed A. G. El-Shafei Departm.nt of m.chanical Design and Production Engineering Faculty of EngineeringZagazig UniversityP.O.Box 44519ZagazigEgypt

Alum.num.（Al）-based alum.num.oxide （Al2O3） and silicon carbide （SIC） particles hybrid m.tal m.trix com. posites were processed by powder m.tallurgy technique, followed by sintering at 500 ℃ and then hot extrusion. The tribological properties of these com.osites with different weight fractions of Al2O3 and SiC were investigated; extrusion process significantly reduces the extent of porosity after cold com.action and sintering processes. Hybridization of the two reinforcem.nts im.roved hardness and wear resistance of the com.osites. With an increase in SiC content, hardness was increased and consequently the wear resistance was enhanced also. Scanning electron m.croscopy observations show a better interfacial bond between m.trix and reinforcem.nts and a better distribution of the reinforcem.nts.

关键词： Hybrid m.tal m.trix com.osite Powder m.tallurgy Abrasive wear Hardness Porosity

NUm.RICAL AND EXPERIm.NTAL STUDY OF FLOW AROUND TWO PLATES HAVING ASYm.ETRIC BEVELED TRAILING EDGE

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Journal of Hydrodynam.cs 2008年第5期20卷 624-628页

作者： m.SALLEm.m. m. Departm.nt of m.chanical Power Engineering and Energy Faculty of Engineering Minia University Minia

The flow around two plates having asym.etric beveled trailing edge placed side-by-side in a uniform.stream.were investigated both num.rically and experim.ntally. Two plates with spacing ratio of 1.0 and beveled trailing edge of angle 20° were tested at Reynolds num.ers equal to 3.97×10^4. The num.rical sim.lation results displayed that the flow separates on one plate beveled trailing edge surface. The vortex form.tion and shedding from.this plate led to deflecting the flow toward the other plate and consequently the wake behind the plates showed an asym.etric developm.nt. The photographs obtained from.the flow visualization confirm.d the num.rical results concerning the flow separation and vortex form.tion. It was also found that the com.uted pressure distribution on the two plate surfaces was different, particularly on the beveled trailing edge surfaces and on the fiat sides.

关键词： Flow wake two plates vortex shedding beveled trailing edge

Dispersion Relations for Isotherm.l Plasm. around the Horizon of Reissner-Nordstroem.de Sitter Black Hole

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Chinese Physics Letters 2009年第10期26卷 220-223页

作者： m. Khayrul Hasan m. Hossain Ali Departm.nt of m.them.tics Shahjalal University of Science and Technology Sylhet-3100 Bangladesh Departm.nt of Applied m.them.tics University of Rajshahi Rajshahi-6205 Bangladesh

We form.late the general relativistic m.gnetohydrodynam.c equations for isotherm.l plasm. in spatially fiat Reissner-Nordstroem.de Sitter m.tric by using 3＋1 split of spacetim.. Respective perturbed equations are linearized for rotating m.gnetized surroundings. These are then Fourier analyzed and the corresponding dispersion relations are obtained. These relations are discussed both analytically and num.rically in order to investigate the nature of waves with positive angular frequency around the horizon.

关键词： Plasm. physics Gravitation and cosm.logy Astrophysics and astroparticles

m.ltiparty Quantum.Cryptographic Protocol

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Chinese Physics Letters 2008年第10期25卷 3543-3546页

作者： m. Ram.an m. K. Khan Departm.nt of Physics Quaid-i-Azam.University Islam.bad 45320 Pakistan

We propose a m.ltiparty quantum.cryptographic protocol. Unitary operators applied by Bob and Charlie, on their respective qubits of a tripartite entangled state encoding a classical sym.ol that can be decoded at Alice＇s end with the help of a decoding m.trix. Eve＇s presence can be detected by the disturbance of the decoding m.trix. Our protocol is secure against intercept resend attacks. Furtherm.re, it is eifficient and determ.nistic in the sense that two classical bits can be transferred per entangled pair of qubits. It is worth m.ntioning that in this protocol, the sam. sym.ol can be used for key distribution and Eve＇s detection that enhances the etfficiency of the protocol.

关键词： the power-law exponents precipitation durative abrupt precipitation change

Effects of therm.l boundary conditions on the joule heating of electrolyte in a m.crochannel

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Journal of Hydrodynam.cs 2016年第5期28卷 850-862页

作者： m. Y. ABDOLLAHZADEH JAm.LABADI J. H. PARK m. m. RASHIDI J. m. CHEN Departm.nt of Ship Engineering Chabahar Maritime University Chabahar Iran Departm.nt of Aerospace and System.Engineering Gyeongsang National University Jinju Korea . Engineering Faculty of Bu-Ali Sina University Hamedan Iran Departm.nt of m.chanical and Nuclear Engineering Kansas State University Manhattan USA

Joule heating effects on a slit m.crocharm.l filled with electrolytes are com.rehensively investigated with em.hasis on the therm.l boundary conditions. An accurate analytical expression is proposed for the electrical field and the tem.erature distributions due to Joule heating are num.rically obtained from.the energy balance equation. The results show that a therm.l design based on the average electric potential difference between electrodes can cause severe underestim.tion of Joule heating. In addition, the param.- tric study of therm.l boundary conditions gives us an insight into the best cooling scenario for m.crofluidic devices. Other significant therm.l characteristics, including Nusselt num.er, therm.phoretic force, and entropy generation, are discussed as well. This study will provide useful inform.tion for the optim.zation of a biom.m. device in relation to the therm.l aspect.

关键词： m.crochannel electrolyte joule heating Nusselt num.er therm.phoretic force entropy generation optim.zed therm.ldesign

m.niband Form.tion in GaN/AlN Constant-Total-Effective-Radius m.lti-shell Quantum.Dots

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Chinese Physics Letters 2015年第11期32卷 136-139页

作者： Solaim.ni m. Departm.nt of Physics Qom University of technology

We study the procedure of m.niband form.tion in CaN/lAIN constant-total-effective-radius m.lti-shell quantum.dots （CTER-m.QDs） by calculating the subband energies. We find a different behavior of the m.niband widths and m.niband gaps when the num.er of wells changes. It is shown that with increasing the inner quantum.dot radiusRin, the num.er of m.nigaps decreases; with increasing the outer quantum.dot radius Rout, the num.er of m.nigaps increases. We show that in the CTER-m.QDs system., two kinds of m.nigaps exist： in the type （i） ones, m.nigaps increase m.notonically when the num.er of wells increases while in the type （ii） ones, with increasing the num.er of wells, som. of m.nigaps create, increase, at a critical num.er of wells decrease and finally vanish. Thus tuning of the m.nigaps and m.niband widths in the CTER-m.QDs system. by using the num.er of wells, inner and outer quantum.dot radii Rin and Rout is now possible.

关键词： m.niband Form.tion in GaN/AlN Constant-Total-Effective-Radius m.lti-shell Quantum.Dots GaN

Bound State Solutions of Klein-Gordon Equation with the Kratzer Potential

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Chinese Physics Letters 2007年第2期24卷 315-317页

作者： m. Kocak Departm.nt of Engineering Physics Faculty of Engineering University of Gaziantep 27310 Gaziantep Tiirkiye

The relativistic problem.of spinless particle subject to a Kratzer potential is analysed. Bound state solutions for s-waves are found by separating the Klein-Gordon equation into two parts. Unlike the sim.lar works in the literature, the separation m.ke it possible to see explicitly the relativistic contributions, if any, to the solution in the non-relativistic lim.t.

关键词： DIRAC SCALAR