Materials Literature
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Abstract Syndiotactic polystyrene (sPS) samples melt‐crystallized into neat α″‐ hexagonal and β′‐orthorhombic modifications were prepared at various temperatures thoroughly for extensive morphological studies. The lamellar morphologies of the as‐prepared sPS samples were investigated with small‐angle X‐ray scattering…
We present a microscopic theory of carrier-induced ferrimagnetism in metallic double perovskite compounds such as ${\mathrm{Sr}}_{2}{\mathrm{FeMoO}}_{6}$ and ${\mathrm{Sr}}_{2}{\mathrm{FeReO}}_{6}$ which have recently attracted intense interest for their possible applications to magnetotransport devices. The theory is…
In order to pursue men's suit wear comfort, the basic data on an accurate men's suit comfort analysis with clothing pressure is required. Therefore, in such investigation, it is difficult to find out ideal persons as test subjects. In the measuring experiments, we used dummies designed for resuscitation practice to ob…
Abstract Functionally graded polyurethane elastomers (FGPUEs) were prepared with two molds fixed at different temperatures (30 and 150 °C). The effects of the molar ratio of the curing agent (60/40, 75/25, or 97/3 1,4‐butane diol/1,1,1‐trimethylol propane) and the molecular weight of the polymer glycol (number‐average…
Introduction. Scope. Brief historical notes with references to the literature. Theory of stability. Design philosophy. Design procedure. Requirements on the load carrying structure. The design analysis process. Loads and load factors. Resistance and resistance factors. Design criteria. Design by testing. Elementary ca…
We study the low-temperature transport properties of clean one-dimensional spin-$\frac{1}{2}$ chains coupled to phonons. Due to the presence of approximate conservation laws, the heat current decays very slowly giving rise to an exponentially large heat conductivity, $\ensuremath{\kappa}\ensuremath{\sim}{e}^{{T}^{*}/T…
Based on previously computed parameters for the electron-phonon couplings and the Coulomb exchange, we compute and classify the static Jahn-Teller distortions, i.e. the minima of the lowest adiabatic potential energy surface, of C60(n+), for all values of charge 1 <= n <= 9 and spin. We compute the intra-band electron…
We have studied the effect of irreversibility induced by repeated thermal cycles on the electric transport and magnetization of polycrystalline samples of La0.5Ca0.5MnO3 and La0.325Pr0.3Ca0.375MnO3. An increase of the resistivity and a decrease of the magnetization at different temperature ranges after cycling is obta…
The complex lanthanide doping of electron manganites results in enhancement of various phase separation effects in physical properties of these compounds. Selecting Ca0.8Sm0.16Nd0.04MnO3 as a model case we show that the first order structural phase transition from paramagnetic semi-metallic phase into anti-ferromagnet…
We elucidate the crystalline nature and the three-dimensional orientation of isolated organic nanocrystals embedded in a sol-gel matrix, using a polarized nonlinear microscopy technique that combines two-photon fluorescence and second harmonic generation. This technique allows the distinction between mono-crystalline…
We present an atomic scale theory of lattice distortions using strain-related variables and their constraint equations. Our approach connects constrained atomic length scale variations to continuum elasticity and describes elasticity at several length scales. We apply the approach to a two-dimensional square lattice w…
We report high $q$-resolution neutron scattering data on PMN-$x$PT single crystals with $x=20%$ and 27%. No rhombohedral distortion occurs in the 20PT sample for temperatures as low as 50 K. On the other hand, the 27PT sample transforms into a rhombohedral phase below T$_C \sim 375$ K. Our data provide conclusive evid…
Soft-X-ray emission and absorption spectroscopies with their elemental specificity are used to determine the local electronic structure of N atoms in Ga(In)AsN diluted semiconductor alloys (N concentrations about 3%) in view of applications of such materials in optoelectronics. Deviations of the N local electronic str…
Effects of stacking behavior of hexagonal basal layers to the structural stability and electronic properties of h-BN were investigated thoroughly using first-principles calculations based on the density-functional theory local-density approximation. Three of five possible h-BN structures with ``good'' stacking were fo…
Abstract A series of Zn– Al-based alloys, one group with 1% Cu and the other without Cu, was produced by using gravity casting. The effect of Al content on hardness, ultimate tensile strength (UTS), impact strength, and tensile creep behaviour at 120 °C and an applied stress of 40 MPa has been investigated. It has bee…
본 연구에서는 재생 냉각용 연소기에 적용되고 있는 동합금과 2상 스테인리스강의 최적 브레이징 조건을 구하였다. 모재는 C18200 동합금과 S31803 2상 스테인레스강을, 삽입금속으로 두께가 각각 50<TEX>${\mu}m$</TEX>, 80<TEX>${\mu}m$</TEX>인 AMS4764를 사용하였다. 브레이징한 시제에 대하여 X선 검사, 강도/기밀 및 파괴시험, 파단면 관찰을 한 결과 두께 50<TEX>${\mu}m$</TEX>인 삽입금속을 사용한 경우 강도특성과 접합면이 양호함을 확인하였다. 반면 두께 80<TEX>${\mu}m$</TEX>인 삽입금속을 사…
The surface properties of fibers play critical roles in many applications such as wicking, soil resistance, adhesion, and bio-compatibility. This paper will discuss a new approach to surface modification in which polymers are grafted to naturally occurring graft-sites on the substrate. The surface modifying polymers c…
Bernd Minnich, Wolf-Dietrich Krautgartner, Alois Lametschwandtner; Quantitative 3D-Analyses in SEM: A Review, Microscopy and Microanalysis, Volume 9, Issue S03,
Abstract The reaction pathways during the synthesis of CuAsS have been studied with the DTA in the range 25 — 810 °C with a heating rate of 10 K/min. Educts, intermediates, and products were characterized by X‐ray diffraction at room and elevated temperatures. Educts were the corresponding elements and the binary comp…
The conformational chain mobility of semi-crystalline poly(ethylene terephthalate), PET, is studied in the glass transition region by thermally stimulated recovery (TSR). The thermal sampling (TS) experiments are analysed according to a simple VoigtKelvin model. Both the activation energy (Ea ) and the pre-exponential…