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Total 2869 records
Comparing the physical properties of Pr/Gd and Pr/Ce substitutions in Ru(Gd 1.5Ce 0.5)Sr 2Cu 2O 10-δ, Article European Physical Journal B ; Volume 63, Issue 4 , 2008 , Pages 461-467 ; 14346028 (ISSN) ; Nikseresht, N ; Hadipour, H ; Akhavan, M ; Sharif University of Technology
We have compared the electrical and magnetic properties of Ru(Gd 1.5-x Pr x )Ce 0.5Sr 2Cu 2O 10-δ (Pr/Gd samples) with x = 0.0, 0.01, 0.03, 0.033, 0.035, 0.04, 0.05, 0.06, 0.1 and RuGd 1.5(Ce 0.5-x Pr x ) Sr 2 Cu 2O 10-δ (Pr/Ce samples) with x = 0.0, 0.01, 0.03, 0.05, 0.08, 0.1, 0.15, 0.2 prepared by the standard solid-state reaction technique. We obtained the XRD patterns for different samples with various x. The lattice parameters versus x for different substitutions have been obtained from Rietveld analysis. To determine how the magnetic and superconducting properties of these layered cuprate systems can be affected by Pr substitution, the resistivity, and magnetoresistivity, with H ext...
Article Advances in Concrete Construction ; Volume 5, Issue 2 , 2017 , Pages 101-115 ; 22875301 (ISSN) ; Zolfaghary, S ; Jafari, N ; Dehestani, M ; Hejazi, M ; Sharif University of Technology
Techno Press 2017
Cement kiln dust (CKD) is one of the most important waste materials in the cement industry. The large amount of this material, has encouraged researchers to propose new ways to recycle and reuse it. In this paper, effects of adding cement kiln dust to the ordinary Portland cement, on the physical and mechanical properties of ordinary and lightweight concrete were investigated. Results showed that concrete containing CKD, presents lower workability and modulus of elasticity; however, improvements in strength was observed by adding particular amounts of CKD. Eventually, it was found that adding 10% of cement weight CKD is the appropriate percentage for utilizing in manufacturing ordinary and...
Article 2003 10th IEEE International Conference on Electronics, Circuits and Systems, ICECS2003, Sharjah, 14 December 2003 through 17 December 2003 ; Volume 3 , 2003 , Pages 1038-1041 ; 0780381637 (ISBN); 9780780381636 (ISBN) ; Khonsari, A ; Sharif University of Technology
Non-recursive and explicit expressions for calculating the number of ways to distribute n indistinguishable balls into m distinguishable bins with different capacities have been derived. Similar expression for the special case where bins have the same capacity was previously reported in the literature. Theses expressions can be used to study network graphs with grid structures. In this line, we have derived some topological properties of meshes, furnishing some expressions to calculate the surface area and volume of radial spheres in the mesh network. © 2003 IEEE
Article Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics ; Vol. 736 , 2014 , Pages 64-85 ; ISSN: 03702693 ; Sirunyan, A. M ; Tumasyan, A ; Adam, W ; Bergauer, T ; Dragicevic, M ; Ero, J ; Fabjan, C ; Friedl, M ; Fruhwirth, R ; Ghete, V. M ; Hartl, C ; Hormann, N ; Hrubec, J ; Jeitler, M ; Kiesenhofer, W ; Knunz, V ; Krammer, M ; Kratschmer, I ; Liko, D ; Mikulec, I ; Rabady, D ; Rahbaran, B ; Rohringer, H ; Schofbeck, R ; Strauss, J ; Taurok, A ; Treberer Treberspurg, W ; Waltenberger, W ; Wulz, C. E ; Mossolov, V ; Shumeiko, N ; Suarez Gonzalez, J ; Alderweireldt, S ; Bansal, M ; Bansal, S ; Cornelis, T ; De Wolf, E. A ; Janssen, X ; Knutsson, A ; Luyckx, S ; Ochesanu, S ; Roland, B ; Rougny, R ; Van De Klundert ,M ; Van Haevermaet, H ; Van Mechelen, P ; Van Remortel, N ; Van Spilbeeck, A ; Blekman, F ; Sharif University of Technology
Constraints are presented on the total width of the recently discovered Higgs boson, ΓH, using its relative on-shell and off-shell production and decay rates to a pair of Z bosons, where one Z boson decays to an electron or muon pair, and the other to an electron, muon, or neutrino pair. The analysis is based on the data collected by the CMS experiment at the LHC in 2011 and 2012, corresponding to integrated luminosities of 5.1fb -1 at a center-of-mass energy s=7TeV and 19.7fb -1 at s=8TeV. A simultaneous maximum likelihood fit to the measured kinematic distributions near the resonance peak and above the Z-boson pair production threshold leads to an upper limit on the Higgs boson width of ΓH...
Article Journal of Laser Applications ; Volume 27, Issue 1 , 2015 ; 1042346X (ISSN) ; Parvin, P ; Reyhani, A ; Mortazavi, S. Z ; Baghapour, Sh ; Amjadi, A ; Sharif University of Technology
Excimer laser at 193 nm was irradiated on the renal tissues during various exposure times in order to investigate the chemical and physical surface properties using Fourier transform infrared spectroscopy, photo electron spectroscopy, contact angle measurements, and tensile test accordingly. We have shown that ultraviolet laser strongly alters the oxygen content of skin layer that causes changes in the tissue morphology leading to significant skin hydrophilicity
Article Applied Physics A: Materials Science and Processing ; Volume 124, Issue 2 , February , 2018 , No. 177 ; 09478396 (ISSN) ; Rahmani, H ; Nemati, A ; Hashemi, M ; Sharif University of Technology
Springer Verlag 2018
The original version of this article unfortunately contained a mistake. The presentation of Eq. 1,2, and 3 was incorrect.The correct versions are given below. The original article has been corrected. (Formula Presented.) (1) (Formula Presented.) (2) (Formula Presented.) (3). © 2018, Springer-Verlag GmbH Germany, part of Springer Nature
Response to comment on 'CFD modeling of CO2 absorption in membrane contactors using aqueous solutions of monoethanolamine-ionic liquids, Article Industrial and Engineering Chemistry Research ; Volume 60, Issue 3 , 2021 , Pages 1503-1504 ; 08885885 (ISSN) ; Darabi, M ; Ghaleh, V. R ; Bakhtiari, O ; Sharif University of Technology
American Chemical Society 2021
Article Journal of Applied Polymer Science ; Volume 87, Issue 13 , 2003 , Pages 2171-2176 ; 00218995 (ISSN) ; Bagheri, R ; Seyed Reihani, S. M ; Forunchi, M ; Sharif University of Technology
A great amount of work has been done over the past few years to understand the structure-properties relationship in polypropylene/glass fiber composites. This is because of the very fast-growing rate of polypropylene applications in the automotive and other industries. This work focused on the role of glass fibers and fiber-matrix adhesion on deformation mechanism. Composites with different fiber content, with and without adhesion promoter, were fabricated. Tensile tests and microscopy techniques were conducted. Based on the results, a physical model has been proposed that illustrates the initiation and growth of the damage under static loading condition. According to this work, the...
Article Algebra and Discrete Mathematics ; Volume 15, Issue 2 , 2013 , Pages 174-178 ; 17263255 (ISSN) ; Darafsheh, M. R ; Sharif University of Technology
The matching basis in field extentions is in-troduced by S. Eliahou and C. Lecouvey in . In this paper we define the minimal and maximal linear matching property for field extensions and prove that if K is not algebraically closed, then K has minimal linear matching property. In this paper we will prove that algebraic number fields have maximal linear matching property. We also give a shorter proof of a result established in  on the fundamental theorem of algebra
Experimental and Theoretical Study of the Effect of Moisture on Methane Adsorption and Desorption by Activated Carbon at 273.5 K, Article Journal of Natural Gas Chemistry ; Volume 16, Issue 1 , 2007 , Pages 22-30 ; 10039953 (ISSN) ; Taghikhani, V ; Ghotbi, C ; Aminshahidi, B ; Lay, E. N ; Sharif University of Technology
Adsorption and desorption of methane by activated carbon (AC) at constant temperature and at various pressures were investigated. The effect of moisture was also studied. A volumetric method was used, up to 40 bar, at a temperature of 273.5 K. Results of a dry AC sample were compared with those obtained from a moist sample and two different ACs with different physical and surface properties were used. As expected, the results showed that the existence of moisture, trapped in the AC pores, could lead to a decrease in the amount of methane adsorbed and a decrease in the amount of methane delivered during desorption. To model the experimental results, a large variety of adsorption isotherms...
Modification of a new potential model used for calculation of the second virial coefficient and zero density transport properties, Article Molecular Physics ; Volume 104, Issue 20-21 , 2006 , Pages 3269-3280 ; 00268976 (ISSN) ; Shokouhi, M ; Sharif University of Technology
A new hard-core potential model was recently used to calculate thermodynamic properties of some model fluids, including equilibrium properties, such as compressibility factor and internal energy. A Lennard-Jones (LJ) like potential has been used to modify the repulsive part of the potential. The modified potential contains five parameters, namely, R, and HS. The parameter is the tail of the attractive branch whose value changes from zero to one. In this work, we have chosen = 1 to make the potential continuous at separation r = R, where the parameter R is the well width. R lies in the range 1.2 to 2.5, and R = 1.3 was found to be the best value for all real gases studied. The parameter is...
An Investigation on Photocatalytic Properties of Sol-Gel Produced TiO2-SiO2-Ni Nanocomposite Coatings, M.Sc. Thesis Sharif University of Technology ; Ghorbani, Mohammad
Titania is one of the photocatalytic materials , but low quantum yield and relatively high band gap of TiO2 limited its applications.There are several ways to improve the photocatalytic properties of this material relied on narrowing the band gap,by doping TiO2 with other metals and oxides or increasing its specific surface area.In this work ,TiO2-SiO2-Ni coating have been made by sol-gel process and deposited on quartz substrate by using of dip-coating method .Effect of increasing Nickel content in nanocomposite and primary sol on crystalline structure,morphol ogy, photocatalytic properties and specific surface area have been investigated by means of X-Ray diffraction method, FT-IR, SEM,...
Optimization of the magnetic properties and microstructure of Co 2+-La3+ substituted strontium hexaferrite by varying the production parameters, Article Ceramics International ; Vol. 40, issue. 4 , May , 2014 , pp. 5675-5680 ; ISSN: 02728842 ; Vahedi, A ; Nemati, A ; Noorbakhsh, M ; Mirsatari. S. N ; Shaygan, M ; Mackenzie, K. J. D ; Sharif University of Technology
The aim of this paper was to improve the magnetic properties of magnetoplumbite-type (M-type) strontium hexaferrite substituted with Co 2+-La3+ produced by conventional ceramic forming techniques. The effect on the magnetic properties of varying the composition of the target compound Sr1-xLaxFe12-yCo yO19 and the primary and secondary firing temperatures was investigated. Microstructure studies and XRD phase analysis indicated that optimum values of the remanent magnetization Br and coercive field Hcj were obtained with a primary firing temperature of 1240 C and a final firing temperature of 1180 C, where (x=y)th 1=0.15, (y/x)exp 2=0.75 and the molar ratio of ferric oxide to strontium...
Nanocluster polyoxomolybdate supported on natural zeolite: A green and recyclable catalyst for epoxidation of alkenes, Article Journal of Coordination Chemistry ; Volume 70, Issue 13 , 2017 , Pages 2212-2223 ; 00958972 (ISSN) ; Hosseini, H ; Sharif University of Technology
Taylor and Francis Ltd 2017
A heterogeneous catalyst for epoxidation of alkenes has been synthesized by introducing polyoxomolybdate into a natural zeolite as a solid and green support. The prepared catalyst was characterized by FT-IR, inductively coupled plasma optical emission spectrometry (ICP-OES), powder X-ray diffraction (XRD), N2 absorption–desorption, field emission scanning electron micrograph (FE-SEM) and transmission electron microscopy (TEM). The catalytic investigations disclosed that nanocluster polyoxomolybdate supported on the surface is an active and recyclable catalyst in liquid phase alkene epoxidation in dichloroethane at 80 °C. © 2017 Informa UK Limited, trading as Taylor & Francis Group
Novel experimental methods for the determination of the boundaries between conventional, severe and over shot peening processes, Article Surfaces and Interfaces ; Volume 13 , 2018 , Pages 233-254 ; 24680230 (ISSN) ; Unal, O ; Amanov, A ; Sharif University of Technology
Elsevier B. V 2018
Shot peening process is one of the severe plastic deformation methods which is well-recognized for the surface layer integrity of the components. This process, according to its energy level, can be categorized into three different cases of conventional, severe, and over shot peening. The aforementioned types of shot peening have positive and/or negative effects on their related performing conditions. In this study, the boundaries between these processes were determined for the first time by presenting novel approaches. The foundations of the presented approaches are microstructural investigations. The microstructures were characterized using optical microscopy, scanning electron microscopy,...
Effect of copper content on tensile mechanical properties of ternary NiTiCu alloy nanowire: molecular dynamics simulation, Article Materials Today: Proceedings ; Volume 5, Issue 1 , 2018 , Pages 1552-1555 ; 22147853 (ISSN) ; Vahedpour, M ; Sadrnezhaad, K ; Sharif University of Technology
Elsevier Ltd 2018
Molecular dynamics (MD) simulation was used to study of mechanical properties of NiTiCu with different content of copper. It was shown that the percent composition of copper are significantly affects the stress-strain curves curve. The results showed that as the Cu content increased, the Yield Strength and Young's modulus decreased. © 2017 Elsevier Ltd
Fabrication of a highly flexible and affordable transparent electrode by aligned u-shaped copper nanowires using a new electrospinning collector with convenient transferability, Article ACS Omega ; Volume 4, Issue 25 , 2019 , Pages 21260-21266 ; 24701343 (ISSN) ; Mohamadbeigi, N ; Sadrnezhaad, Kh ; Mahdavi, M ; Sharif University of Technology
American Chemical Society 2019
By making aligned and suspended copper nanowires, a high performance, transferable, and flexible transparent electrode is reported. Indium tin oxide is often used in devices such as displays, solar cells, and touchscreens that require transparent and conductive plates. Because of problems such as brittleness, high cost, and environmental effects, this material is facing rivals, the most serious of which are metallic nanowire meshes, especially copper. We developed a simple technique which uses a U-shaped collector in the electrospinning process with three advantages including the enhancement of the figure of merit (which is related to the surface resistance Rs and the transmittance T) by...
Evaluation of simultaneous effect of melt filtration and cooling rate on tensile properties of A356 cast alloy, Article Iranian Journal of Materials Science and Engineering ; Volume 16, Issue 3 , 2019 , Pages 44-51 ; 17350808 (ISSN) ; Davami, P ; Pirmohammadi, M ; Sharif University of Technology
Iran University of Science and Technology 2019
B The combined influence of both melt filtration and cooling rate on the microstructure and mechanical properties of A356 cast alloy was studied. A step casting model with five different thicknesses was used to obtain different cooling rates. The effect of melt filtration was studied by using 10 and 20 pores per inch (PPI) ceramic foam filters in the runner. Results showed that secondary dendrite arm spacing decreased from 80 μm to 34 μm with increasing cooling rate. Use of ceramic foam filters in the runner led to the reduction of melt velocity and surface turbulence, which prevented the incorporation of oxide films and air in the melt and consequently had an overall beneficial effect on...
Article Critical Reviews in Solid State and Materials Sciences ; Volume 45, Issue 1 , 2020 , Pages 22-65 ; Azarniya, A ; Safavi, M. S ; Farshbaf Ahmadipour, M ; Esmaeeli Seraji, M ; Sovizi, S ; Saqaei, M ; Yamanoglu, R ; Soltaninejad, M ; Madaah Hosseini, H. R ; Ramakrishna, S ; Kawasaki, A ; Adams, S ; Reddy, M. V ; Sharif University of Technology
Taylor and Francis Inc 2020
Metallic or ceramic micro/nanoporous materials have attracted particular attention due to some interesting structural and functional properties. There exist a variety of methods for producing porous materials by which optimized features can be reached. Spark plasma sintering (SPS) is one of these new-emerging approaches. This technique is often combined with conventional technologies and produce a variety of porous structures with tailorable microstructure and physicomechanical properties. This review addresses SPS and obtainable porous materials with nanoscale and microscale microstructural features. The processing methods, microstructural phenomena, and physicomechanical properties of...
Article Proceedings of the 8th Conference and Exhibition of the European Ceramic Society, Istanbul, 29 June 2003 through 3 July 2003 ; Volume 264-268, Issue II , 2004 , Pages 941-944 ; 10139826 (ISSN) ; Javadpour, S ; Jamshidi, M. S ; Amini, S ; European Ceramic Society; Turkish Ceramic Society ; Sharif University of Technology
Trans Tech Publications Ltd 2004
The production of porous (SAFFIL) preforms and SAFFIL/SiCP hybrid preforms will be discussed. SAFFIL fibers and SiCP are dispersed into an aqueous medium that consists of colloidal silica binder, distilled water, dispersants and deflocculants using agitation, spontaneous sedimentation, followed by drying and final strengthening. The effect of different process parameters such as various deflocculants and surfactants on the mechanical properties, mixing time and volumetric change of these preforms will also be investigated