Materials Literature
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Changes of phase transformation temperatures of a NiTi alloy have been investigated under non-isothermal conditions by using a differential scanning calorimeter (DSC). It has been found that the duration for phase transformation declines exponentially with increasing the heating rate. The specific heat capacity of the…
Superplastic behavior of a duplex stainless steel has been studied at 1223 K (950°C) and 1253 K (980°C) for initial strain-rates ranging from 2x10 -4 s -1 to 8x10 -3 s -1 In the given range of temperature, it was observed that the elongation increased as the strain rate decreased The best superplastic conditions were…
This article covers the various materials aspects of the shape memory alloys that go into the design of fastening devices. A brief overview of the shape memory phenomenon and the martensite transformation during free and constrained recovery has been given to clarify the role of the martensitic transformation in the s…
Accurate calculations for the phonon dispersion relations of single wall armchair and zigzag nanotubes are presented. The calculations are performed using a plane wave basis set and density functional theory (DFT). The dependency of Raman active and infrared active modes on the radius is investigated in detail. To acc…
In this paper we describe the development of Cu/CeO 2 /YSZ anodes for solid oxide fuel cells (SOFCs) that are active for the direct electrochemical oxidation of dry hydrocarbon fuels. A novel method for synthesizing thin-electrolyte, anode-supported cells is described. This method uses tape-casting of YSZ layers with…
The liquid phase separation techniques is adopted to coat AN with ployvinyl butyral (PVB). The properties of the coated AN are studied. The results show that the effect of coating is good. Absorbtivity and Caking capability have greatly reduced. The absorption peak of crystal transition of ⅡⅢ shifts to higher tempera…
Herein a preparation of foam ceramics is reviewed:the foam impregnated with slurry based on its being piled up,the apparent porosity depends on the degree of the pile,effect of the different additives and the sintering conditions on the properties of the clay foam ceramics are investigate,the finally apparent porosity…
Laboratory experiments for the kinetics of periphyton growth were conducted to find out the effect of hydraulic characteristics on the production and the detachment of periphyton, in which the amount of periphyton and the rate of detachment were measured. The results of the experiments show that the growth rate of per…
Based on the Debye relaxation theory, the temperature dependence of relaxation time can be obtained from the temperature dependence of dielectric loss. Then the relaxation activation energy Q and the pre-exponential factor τ0 can be calculated. The values of Q of four typical relaxor ferroelectrics: disordered (degree…
The crystals of a zinc-sodium complex with furan-2-carboxylate (FCA) as a ligand, n[Zn(H2O)6]2+[Zn8Na2(FCA)18(OH]2]2- n , contain hexahydrated zinc cations and polyanions in which four differently coordinated zinc(II) cations are bridged by bidentate and monodentate (FCA) ligands. In addition, a number of carboxylate…
A theoretical model has been developed for describing the spreading process in a cutting room. Verification work for this model is described in this study, the aim of which was to determine whether the model could accurately calculate the total spreading losses in a real situation. The results presented in this paper…
Changes in the magnetostriction characteristics of grain-oriented electrical steels due to laser irradiation were studied. It was found that the ac magnetostriction amplitude could be controlled by laser irradiation, which creates magnetic closure domains in the steels. This effect may make it possible to reduce the t…
Thin TiO2 layers were sputter-deposited on Pt/Ti/SiO2/Si wafers, as buffer layers for PZT thin film capacitors. It was found that TiO2 buffers of less than 4-nm-thickness could assist in obtaining highly uniform PZT thin films with no second phase. The leakage current behaviors of the PZT based capacitor are improved,…
During stress wave propagation through a composite material, the wave velocities through the fibre and matrix are different because of the differences in the respective moduli and densities. The stresses and strains generated in the constituent material are accordingly related to the wave velocities. In a typical spli…
The radical formed by muonium addition to diketene has been studied by transverse field muon spin rotation (TF-µSR) and muon avoided level-crossing resonance (µALCR). The TF-µSR spectrum shows that muonium adds to only one site in diketene, and it is clear from the µALCR spectrum that the radical product contains two…
Analyses are made on the characteristics of cooling and undercooled solidification of multi-stage atomized aluminum droplets. Models are established for Newtonian cooling, highly undercooled heterogeneous nucleation and steady-state continuous growth. They are used for numerical simulation of the thermal history of th…
A novel ZnO (zinc oxide)–PANI (polyaniline) composite film on PATP (ρ-aminothiophenol)/Au was prepared by electrochemical-assembly (ECA) and sol–gel technique, and this composite film shows excellent luminescent performance and high photoelectrochemical conversion efficiency, which can be industrially used for lumines…
A non-destructive system using a Hall effect I.C. sensor has been used to measure the distribution of the vertical component of stray magnetic field on the opposite surfaces of a magnetised specimen of high permeability, grain-oriented electrical steel. An optical microscope was used to establish positions of grain bo…
Radyasyon bir kaynaktan elektroman yetik dalgalar veya parçacıklar şeklinde salınan bir enerjidir. Lazer, güneş, radar sistemi, tele vizyon vericileri, x-ışmı makineleri ve radyo aktif kaynaklar gibi birçok radyasyon kaynağı bulunmaktadır. Genellikle insan yararına kul lanılan yapay radyasyon kaynaklarından ve doğ…
The purpose of the present paper consists in finding a more efficient and less expensive decontamination method for surfaces contaminated with Tritium-labelled compounds, being able to provide information for nuclear field specialists. This paper studies the polymeric hydrogel DeconGel, presenting the methods and faci…