Materials Literature
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The influence of process variables on characteristics of modal siro-spun yarns has been studied using Box-Behnken response surface design. The characteristics of these yarns have been evaluated and compared with those of equivalent double-rove spun yarns. I t i s observed that the increase in strand spacing from 6 mm…
Thin films of the colossal magnetoresistance material La1–xSrxMnO3 (LSMO) grown on SrTiO3 substrates exhibit bi-axial magnetocrystalline anisotropy with easy axes along the [110] and [10] directions. We have recently discovered that the intrinsic biaxial magnetic anisotropy combined with a giant planar Hall effect lea…
The title compounds were prepared by mixing either aqueous and / orethanolic solutions of YCl3.6H2O and violuric acid monohydrate in mole ratio(1:2). The prepared crystalline complex belongs to orthorhombic system, withunit cell constants: a = 8.6925(4), b = 17.0421(9), c = 5.5285(3) Å, V =818.98(7) Å3, Z = 2, space g…
The rates of chlorination of zinc, copper and iron at 800°C in air and chlorine mixtures were measured by thermogravimetric analysis. Scanning electron microscopy, atomic absorption spectroscopy and X-ray diffraction were used to examine and characterise the reaction products. From the results obtained at 800°C, it ap…
Abstract The goal of this paper is to study thermal stability of some ferrocenes with acidic functional groups. Some other kinetic characteristics such as critical temperature and the rate constant corresponding to maximal degradation speed have been also evaluated. The type of functional units adjacent to the ferroce…
Abstract All‐optical poling of side‐chain azobenzene homopolymers PCN2 and PCN6, i.e. poly (6‐[4‐(4‐cyanophenylazo) phenoxy] x ‐methylene methacrylate) for x = 2 and 6, with different spacer lengths was experimentally investigated. Due to the low absorption of the samples at 532 nm, it was found that there is a nearly…
The stability of the shapes of the growing crystal face and dissolution face in a two-dimensional mathematical model of crystal growth from solution under microgravity is studied. Effects of the interface kinetics and anisotropy of crystallization and dissolution on the stability are also studied. It is proved that th…
Specimens of precipitation hardening 16-5-1 stainless steel were solution treated at 1050°C for 1 h followed by aging at temperatures in the range 400 – 750°C for various holding times (1 – 16 h). After heat treatment, two types of corrosion test (accelerated and immersion testing) were conducted in 6% ferric chloride…
Both refluxing reaction under atmospheric pressure and hydrothermal reaction under autogenous water vapor pressure of two kinds of starting slurry with the initial molar ratio Na:Zn:Li:Si= 0.7:5.4:0.6:8.0 and 1.4:5.4:1.2:8.0 made from Zn-Si homogeneous precipitates, lithium fluoride and sodium hydroxide successfully h…
Abstract The binding of sulfanyl and alkylsulfanyl model ligands to gold clusters was studied for the case of Au 13 (SR)n with R = H, CH 3 and n = 4, 6, 8. Accurate all-electron electronic structure calculations and geometry optimizations of these gold-thiolate clusters have been performed with a scalar relativistic K…
Effects of low energy electron irradiation (5-30 keV) on some of the optical properties of CdSe nanocrystals are examined. Degradation in luminescence intensities are measured and compared for inorganic nanocrystals coated in trioctylphosphine oxide (TOPO) and biologically compatible CdSe nanocrystals coated in mercap…
Within the framework of effective mass approximation, the ground state of excitons confined in spherical core-shell quantum-dot quantum-well (QDQW) nanoparticles is solved by using the stochastic variational method, in which the finite band offset and the heavy (light) hole exciton states are considered. The calculate…
In this work, we examine the role of curvature and surfactant packing in controlling the structure of periodic silica/surfactant composites by driving such materials through a transformation from a hexagonal to a lamellar phase. We focus on how the interplay of desired packing and volume constraints dictates the resul…
The title compounds Ca1-xLaxTi1-xFexO3 (0.0 ≤ x ≤ 0.5) were prepared bysolid state reaction at 1350°C for 24 hours. X-ray powder diffractionmeasurements were performed by step scanning mode.All the prepared sampleswere single phase of perovskite orthorhombic system and belong to the spacegroup Pbnm. The crystal struct…
Energy dispersive X-ray spectrometry of uncoated insulators performed at low beam energy (incident energy < or = 5 keV) and in the variable pressure scanning electron microscope and the environmental scanning electron microscope is subject to spectral artifacts. Charging decelerates the incident beam electrons and red…
Presented are initial, S 0 , and coverage, Θ, dependent, S(Θ), adsorption probability measurements, respectively, of CO 2 adsorption on a hydrogen precovered, polar, Zn -terminated surface of ZnO , parametric in the impact energy, E i , and atomic hydrogen precoverage, Θ H . Furthermore, CO 2 Thermal Desorption Spectr…
Glasses in the system (Na2B4O7)75(Fe2O3)25-x(Bi2O3)x with x=0,5,15 and25 mol % were prepared. A.c. Conductivity (σa.c) of the prepared samples hasbeen measured in the frequency range (0.5-20 kHz). The measurements werecarried out in the temperature range (290-420K). The obtained results showedthat, σa.c. obey the rela…
Abstract We briefly review phenomenological properties of the intermittency behavior of blinking nanocrystals (i.e., quantum dots). Special emphasis is given to the properties of intensity correlation function that exhibit behaviors mentioned in the title. We discuss models which can be used to explain the strange kin…
Abstract Thermoplastic polyurethanes (TPU) are an important class of elastomers that found many novel and specialized applications where high mechanical and chemical performances are prerequisites. They are known for their good mechanical strength, wear and tear resistance, and low-temperature elasticity. The aim of t…
Kurzfassung Aus Schäden bei der Verarbeitung und dem Betrieb von Warmarbeitswerkzeugen können Maßnahmen gegen frühzeitigen Ausfall abgeleitet werden. Bei der bekannten thermischen Ermüdung durchläuft die Rissfortschrittsgeschwindigkeit ein Maximum und im Maximum der Radialspannung entstehen unter der Oberfläche Querri…