Materials Literature
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Recently, we reported about successful synthesis of crystalline carbyne from graphite by step‐like shock‐wave compression. Thin graphite foil was placed into the recovery assembly between two thick PTFE dicks. Shock pressure was 36 GPa, shock temperature was estimated as 730 K. In the recovered samples the volume cont…
The catalytic performance of silica-based supported ionic liquid-phase (SILP) Rh-sulfoxantphos/[BMIM][C 8 H 17 OSO 3 ] catalysts with different compositions, i.e. type of support, ionic liquid content and ligand-to-metal ratio, has been examined for continuous-flow gas-phase propene hydroformylation. The key parameter…
Na3MgTi(PO4)3 phosphate exists in both crystalline and vitreous forms. The glass-crystal transformation was investigated using DTA, XRD, Raman spectroscopy and ionic conductivity. The crystalline phase which belongs to the Nasicon type family structure, space group R3, contains isolated TiO6 octahedra whereas the corr…
The population (frequency of appearance) of group-subgroup symmetry descents (species) and of different combinations of ferroelastic and ferroelectric properties observed in crystals with a single phase transition have been derived from the updated Tomaszewski's database of structural phase transitions [1 Tomaszewski,…
The phase equilibrium behavior of a typical colloidal dispersion by the van der Waals-like theory was studied. In this theory, the colloid–colloid potential is split into two parts: a repulsive part modeled by the hard-core potential and an attractive part modeled by the square-well potential corrected by a linear tai…
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…