Liquid-Crystalline Inorganic-Organic Hybrids Based on Terminally Attached Mesogens
The results of the synthesis and the investigaiton of a number of multipodal and branched siloxane and silsesquixane liquid crystals is reported.
Materials Literature
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Characterization of domain structures in epitaxial PbTiO3 thin films using synchrotron XRD
Ferroelectric twin domain structures of epitaxial PbTiO3 thin films grown on various single crystal substrates were investigated in-detail by reciprocal space mapping techniques using synchrotron X-ray. Direct comparison with one-directional X-ray diffraction scan that is conventionally employed for structural charact…
HYDROTHERMAL SYNTHESIS OF CALCIUM PHOSPHATES SPHERICAL PARTICLES
Spherical particles of hydroxyapatite with β-tricalcium phosphate were prepared from spherical calcite particles by hydrothermal method. The spherical calcite particles of about 2.5mm in size as the starting materials were formed through the process which transformed hard water to soft water. The spherical calcite par…
Structure of Poly(ethylene terephthalate) Fibers Treated in Supercritical Carbon Dioxide Fluid.
The dyeing behaviors and changes in fiber structure in supercritical CO2 fluid for several types of high-speed spun and regular fully oriented poly (ethylene terephthalate) (PET) fibers were compared. At lower temperature and pressure, the high-speed spun fibers, which had inherently larger crystallite sizes and lower…
Mechanical, Vibration and Visco-elastic Behavior of Abelmoschus Esculentus Fiber Reinforced Epoxy Composite
Nowadays, research is focused on using bio-degradable natural fibre-based composites for secondary structural members. The present study aims to investigate the effect of fiber loading and surface treatment on the mechanical, vibrational, and viscoelastic properties of short, randomly oriented Abelmoschus Esculentus f…
Application of the Markov Process to the Chain-of-bundles Model with a Hexagonal Fiber Array.
The Markov process is applied to the chain-of-bundles model with fibers packed in a hexagonal array, in order to obtain the analytical solution for the fracture probability of a unidirectional fiber composite. It was assumed in the process that a group consisting of fiber breakage points, the so-called cluster, evolve…
Grain Growth and Annealing Textures of TiC- and HfC-Dispersion Strengthened Molybdenum Sheets.
In order to understand in detail the secondary recrystallization behavior of fine-grained molybdenum alloy sheets dispersed with TiC and HfC particles of 0.8mol%, the effects of kinds of dispersed particle on the secondary grain growth behavior and annealing textures in hot-rolled dispersion strengthened molybdenum sh…
Structural and dielectric properties of BaTiO3SrTiO3-multilayers deposited by PLD
Dielectric superlattices are characterized by the structural variability of the film periodicity additional to the stochiometry. They have interesting dielectric properties different from the solid solutions of the same overall composition. In this paper the structural and dielectric properties of BaTiO3/SrTiO3-superl…
Absorption limited performance of SiO_2/Al_2O_3 multi-layer coatings at 193nm – a systematic study
The optical performance and radiation stability of HR193nm - SiO2/Al2O3 – coatings deposited by different technologies (RE, PIAD, IBS) were systematically evaluated and causes for the low LIDT at 193nm compared to 248nm were investigated.
A Thermal Perspective of NiTi Alloy under Non-Isothermal Conditions
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 Deformation of a Duplex Stainless Steel
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…
The Application of Ni - Ti Shape Memory Alloys as Fasteners
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 density functional calculations for the phonon dispersion relations of carbon nanotubes
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…
Anodes for Direct Oxidation of Hydrocarbons in Solid Oxide Fuel Cells
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…
Study on Properties of the Coated AN with Polyvinyl Butyral
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…
Investigation of the Preparation Technology of Foam Ceramics
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…
STUDY ON PRODUCTION AND DETACHMENT OF PERIPHYTON GROWING ON FLAT CHANNEL BED
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…
A new method of calculating the activation energy of relaxor ferroelectrics
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 CRYSTAL AND MOLECULAR STRUCTURE OF A FURAN-2-CARBOXYLATE HETEROBIMETALLIC COMPLEX [Zn(H2O)6]2+[Zn8Na2(C5H3O3)18(OH)2]2-
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…
Fabric Loss during Spreading: A Comparative Study of the Actual Loss in Manufacturing Men's Shirts
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…