Materials Literature
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We observe, in free-standing films of a chiral smectic liquid crystal, a series of discrete transitions in the relative orientation of the tilt of the interior and surface layers. These transitions include a remarkable reentrant synclinic-anticlinic-synclinic ordering sequence of the film surfaces in the presence of a…
For faster signal propagation in integrated circuits, new materials with lower dielectric constant (low-k) values are required with copper metal lines. Although integration of low-k materials (k<3.0) has been demonstrated, but ultra low-k materials possess many challenges due to their poor mechanical integrity and…
In this work, a growth analysis is made on the banded microstructure formation during directional solidification of peritectic alloys. The convection model, which has been proposed to explain the discrete banded microstructure formation, is extended in the part of the nucleation condition. Applying the nucleation and…
In the present work, the calculated growth stresses arising from iron oxide layers are compared to measurements of the macroscopic residual stresses. High temperature x-ray diffraction was used for determining the stress created in thin iron oxide layers formed on phosphated α-Fe, as a function of the oxidation time.…
The removal of ethylene oxide (EtO) in a combined system adsorber desorber/catalytic reactor has been investigated. The combined system was a modified draft tube spouted bed reactor loaded with Pt/Al2O3 catalyst. The annular region was divided into two sectons, the "hot" section contained about 7 % of catalyst and it…
Phosphogypsum is primarily classified as a heavy waste. The classification of phosphogypsum as dangerous waste may be only maintained under the condition that phosphates with the highest content of radio nuclides are used in the production of H3PO4 by the so called "wet procedure" (Morocco, Florida), which, due to the…
We discuss here the effect of water-insoluble pharmaceutical aids on the nature of drug release from composite polymeric prodrugs synthesized by mechanochemical solid-state polymerization. Magnesium stearate (Mgst) and hydrogen castor oil (HCO) were used as water-insoluble pharmaceutical aids. Composite polymeric prod…
A derivative of the Si3N4 ceramic is the quaternary SiAlON solid solution. In this paper the characteristic stress-strain response of the β-and c-SiAlON phases is investigated using an ab initio computational procedure, for the γ11 strain component, where different substitutions of the atomic pairs, Al-O, were perform…
Structured fluids (concentrated suspensions, emulsions, gels⋯.) typically exhibit an apparent yield stress. We show here that for a number of these fluids, a unique yield stress cannot be defined. Instead, when solicited above a critical stress, typical yield stress fluids (gels, clay suspensions) and soft glassy mate…
A novel 2D nanometer edge contact type cell for phase change RAM is manufactured, in which the active area can be controlled mainly by the thickness of both bottom electrode film and the GST film. The high resistive GST is indispensable to minimize the writing current and threshold voltage of PCRAM. The GST resistivit…
A computer aided molecular design (CAMD) technique was applied to investigate a possible packing model for cellulose triacetate I (CTA I). The model was constructed based on structural data obtained by CP/MAS 13C NMR. The starting model was determined by molecular mechanics (MM) calculations on the basis of a model pr…
生直前に現れる密度ゆらぎに基づく相分離や,部分的に液晶的な秩序構造の発現などが起こることが明らかになってきた。核発生速度と結晶成長速度の温度依存性は釣鐘型を示し,その極大値の分子量依存性には指数則が成立する。分子鎖折りたたみ結晶化における極大結晶成長速度の分子量依存性は,すべての結晶性高分子においてスケーリングすることができ,分子量の-0.5乗で表される。
In order to investigate the influence of shot peening on the surface durability of sintered powder metal gears, the plasma case-hardened sintered powder metal gears shot-peened with different shot diameter and shot hardness were fatigue-tested using a gear testing machine. The hardness, the compressive residual stress…
The recent development of lightweight yet high output automotive engines has increased demand for valve springs with high fatigue resistance. This has led to the development of valve spring wire with high fatigue strength. The Cr-Si steel oil tempered wire (SAE 9254) has been commercially used for the valve spring wir…
Although the coefficient of restitution was originally thought to be only a material property, the coefficient of restitution also depends upon initial conditions as well as on the frictional effect for oblique collisions. The objective of this paper is to demonstrate a method for obtaining the coefficient of restitut…
Two widely different kaolin deposits were investigated in order to determine their physical and chemical properties and suggest their possible utilization. Kaolin deposits from Leucogia area, NE Greece, were formed in situ by weathering of gneissic rocks under a temperate climate; they consist largely of halloysite ex…
The effect of turbulent mixing on the course of two fast parallel competitive chemical reactions (netralization of sodium biborate snd iodide-iodate oxidation-reduction reactions) carried out in continuous stiwed tank reaktors have been studied theoretically, using Packet Diffusion Model, and experimentally to validat…
Optical transmission and reflection measurements for crystals of potassium tetrachlorozincate (KZC) doped with Mn2+ or Ni2+ in different concentrations and irradiated with different γ-doses have been carried out along the three crystallographic axes. The results were analyzed to determine the absorption coefficient (α…
Silicone rubber/mineral powder composites have been prepared by surface modification and ultrafinecrashing of mineral powder, mixing and vulcanizing with silicone rubber resin. The surface and interface energy for mineral filler and silicone rubber matrix were investigated. It was found that there is a correlation bet…
Poly(ethylene terephthalate) (PET) / poly(ethylene naphthalate) (PEN) blends with 50/50 composition have been prepared by melt-mixing at the temperatures above 280°C and subsequent heating at 280°C before hot-press molding. Progress of transesterification reaction and formation of PET-PEN random copolymers during thes…