Materials Literature
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With respect to frequently desired actuators, high-signal electrostrictive deformation is an electromechanical alternative to the piezoelectric effect. Several disadvantages, which conflict with general applications, are investigated. Possibilities to overcome or reduce such disadvantages are discussed and suitable ma…
Thermal endurance characterization of XLPE cable models is realized by applying conventional procedures and an analytical method. The latter method is based on oxidation induction time measurements to estimate the activation energy of the degradation reaction and then the slope of the thermal endurance line. The conve…
We review the recent theoretical developments in the study of domain structure dynamics through nucleation-and-growth processes of first-order phase transitions with non-conserved order parameters. We introduce the spatial and space-time correlation functions of the domain structures based on the model proposed by Kol…
A new 2×2 propagation matrix for obliquely propagating light is used to compute the electro-optics of an electrically controlled birefringence liquid-crystal display, with arbitrary viewing angle. The results are the same as those obtained by the generalized geometrical optics approximation and are in good agreement w…
The structure and magnetic properties of yttrium diphthalocyanine [${\mathrm{YPc}}_{2}$]\ensuremath{\cdot}${\mathrm{CH}}_{2}$${\mathrm{Cl}}_{2}$ are reported. Phthalocyanine macrocycles are stacked above each other in one direction, with a staggered angle of 45\ifmmode^\circ\else\textdegree\fi{}. One-dimensional organ…
In order to investigate the effect of the spin-orbit interaction on strong magnetism, the authors have developed a method of electronic structure calculation which includes the spin-orbit interaction in an approximate way into the semi-relativistic LMTO Hamiltonian. In this way both the spin-orbit interaction and the…
Copper is a possible substitute for Al in very large scale integration interconnects because of its higher resistance to electromigration damage (EMD) and its lower electrical resistivity. In the present work, we report on electrical resistance measurements of the activation energy for EMD in Cu films as determined by…
The plate-shaped crystals of rat bone are arranged in parallel layers that form coherent structures up to the level of individual lamellae. The crystal layers of the thin lamellae are parallel to the lamellar boundary, whereas those of the thicker lamellae are oblique to the boundary. The basic structure of rat bone c…
Biquadratic coupling between two order parameters Q1 Q2 can lead to transitions between a phase with only one of the two order parameters active (phase I or II) and a mixed phase III in which both order parameters are symmetry breaking. Domain walls for positive coupling energies are chiral under thermodynamic conditi…
Abstract The use of plasma deposition to introduce sulfonate groups to the surface of a polyurethane was attempted. In previous work, the bulk incorporation of sulfonate groups was found to improve the blood contacting properties of the base polyurethane but physical properties in the hydrated state were adversely aff…
Abstract The structural hierarchy in injection molded blends of poly(ethylene terephthalate) (PET) and a commercial liquid crystal polymer (LCP), two immiscible polymers, was characterized at various blend compositions. The macroscopic core and skin have a gradient structure and are subdivided into ordered and disorde…
Abstract The average molecular interchain spacing (〈 R 〉) in Angstroms for amorphous polymers was calculated from the strong maximum in the wide‐angle X‐ray scattering (WAXS) diffraction scan using established equations. The half‐width ( HW ) of the maximum was used to qualitatively describe the distribution of 〈 R 〉.…
Abstract The effect of thermal treatment on compression‐molded poly(L‐lactic acid) (PLLA) has been investigated by means of viscosimetric molecular weight ( \documentclass{article}\pagestyle{empty}\begin{document}$$M_{w_v}$$\end{document} ) determination, differential scanning calorimetry (DSC), and dynamic mechanical…
A new approach to estimating the life distribution of electrical insulation at nominal conditions from the results of accelerated life testing of electrical insulating materials is introduced by the authors. A very general family of probability distributions is introduced and a best fit member of this family is used t…
The crystal structure and morphology of eutectic carbides are known to strongly determine the mechanical and tribological properties of Cr–Ni white cast irons. In an effort to improve these properties, investigators at the US Bureau of Mines have studied the effects of alloying additions of 0·0–1·8%Si, 0·0–6·7%Ni, and…
A quasi-finite element method for calculation of static fields in media with hysteresis is presented in this paper. The proposed method utilizes vector Preisach hysteresis model to describe the material behavior. Time-stepping technique is employed in which the evolution of the electromagnetic system is traced to comp…
The photochromic dinaphthofurofuran 1 undergoes a base-induced ring opening to yield 2, which instantaneously forms the dark blue dimeric quinone methide 3 on exposure to light. This compound is also the photoproduct of 1 and can react back to it both photochemically and thermally.
Abstract Metall(II) bis‐chelates of 1,3‐dithiole‐2‐thione‐4,5‐dithiolate (dmit) and 1,2‐dithiole‐3‐thione‐4,5‐dithiolate (dmt) undergo in CHCl 3 /CH 3 CN (ratio 1:24) photooxidation to the metal(III) bis‐chelates when irradiated at 313 nm. No side reactions were observed. There is no correlation between the quantum yi…
A new liposoluble porphyrin, 2,7,12,17-tetrahexyl-3,8,13,18-tetramethylporphin(THTMP), and its complexes with divalent (Mg, Co, Ni, Cu, Zn, Cd, Hg) and trivalent (Mn, Fe) metals have been synthesized. The electronic, infrared, and far-infrared spectra of these compounds were obtained in the same nonpolar, noncoordinat…
The forced global greenhouse effect and consequently rising sea levels are discussed. A brief survey of biomineralization processes and laboratory/field work encompassing mineral accretion (MA) is given, which is performed by placing cathodic forms and anodes in sea water or other electrolytes. It is proposed to grow…