Materials Literature
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The effective thermal conductivity κ of multilayer printed wiring boards (PWBs) has been measured for heat flowing in a direction either parallel (κ∥) or perpendicular (κ⊥) to the plane of the board. The conductivity of the glass/epoxy insulating material from which the boards are manufactured is anisotropic (κ∥ge ≈ 3…
The surface tensions, wetting tensions, contact angles and solid/liquid interfacial tensions of defined siloxanes as well as those of analogous carbosilanes, polysilanes and neopentyl substituted silanes were determined. The wetting experiments were carried out on a glass plate coated with perfluoroalkyl methacrylate…
A new ultraviolet (UV) Raman spectroscopic system to measure the Raman scattering from materials at high temperatures up to 1500 °C has been designed. This system is based on a CW (continuous-wave) ultraviolet argon-ion laser (363.8 nm), a spatial filter, a single monochromator coupled to a double-grating rejection fi…
From a study of the temperature dependence of the dielectric constant of Pb(Zr x Ti1−x >)O3 the ferroelectric transition for 0·515 ≤ x ≤ 0·535 is shown to be discontinuous in nature while it is continuous for x = 0·550. It is proposed that there may be a tricritical point around x = 0·545. The two-phase nature of the…
Reversible phase transitions between the amorphous and the crystalline states have been induced in Sb 0.93 Ge 0.07 thin films by irradiation with picosecond laser pulses of different energy densities. It is shown for the first time that a material can be repetitively cycled between both states by means of ultrashort p…
We have undertaken a comprehensive study of the reaction NH 2 (X 2 B 1 ) + NO → N 2 + H 2 O (1a) and NH 2 (X 2 B 1 ) + NO → N 2 H + OH → N 2 + H + OH (1b). Experimental measurements of the reaction rate coefficient and product branching fraction are combined with accurate ab initio calculations to give a detailed pict…
▪ Abstract Passive matrix, supertwisted nematic (STN) displays are well established as small- and medium-sized matrix displays and are presently being used in half of the notebook-sized computers. STN screens are being considered as desk-top CRT monitor replacements because their simpler construction allows them to be…
Techniques are summarized for evaluating thermodynamic functions for pure elements in crystal and liquid phases. An accurate evaluation of the ion-motional free energy is given by quasiharmonic lattice dynamics at quantum temperatures, and computer simulations (e.g., molecular dynamics) at classical temperatures for b…
A theoretical analysis is presented in this paper to predict the dynamic plastic response of aluminium alloy and mild steel circular plates when struck normally by blunt solid cylindrical masses at the center. Reasonable agreement is obtained with experimental results for the permanent transverse displacements. Differ…
The effect of coexchanging of Cu-M-ZSM-5 zeolites (M = Ce, Sn, Sm) upon the interaction with nitric oxide was investigated by FT-IR. Spectra recorded on Cu-ZSM-5, in the presence of NO and at room temperature, exhibit typical features, very well reported in the literature. During NO decomposition at 673 K in the prese…
Photoinduced electron transfer reactions are characterized in supramolecular assemblies consisting of a series of Ru(II)−bipyridine complexes that include tethered dialkoxybenzene units 2 − 5 and cyclo[bis( N, N ‘- p -xylylene-4,4‘-bipyridinium)], BXV 4+ ( 1 ). Formation of supramolecular complexes between BXV 4+ and…
Alignate gels are known to be biocompatible, degradable, and nontoxic. In this study, sodium alginate was impregnated into a porous, knitted polyester graft (Microvel double velour graft) 6 mm in diameter. The alginate-impregnated graft was investigated in vitro and in vivo to evaluate its potential for use as a new v…
Ceramic materials are usually assumed linear elastic up to failure and the failure criterion is accustomed to be a limit condition related to the tensile strength. Due to the difficulties associated with the uniaxial tensile test, some different alternatives have been posed such as Brazilian tests and spalling test of…
A new procedure for the synthesis of mesoporous alumina membranes is presented. Using this technique, catalytic membranes with precise active layer width and location were prepared by sequential slip-casting of Pt/alumina and alumina sols. Different distributions of catalyst within the membrane can be easily obtained…
3-(o-Carboranylhydroxymethyl)-7-isopropylazulene sodium carboxylate (1) and 3-(o-carboranylmethyl)-7-isopropylazulene sodium sulfonate (2) were synthesized from the palladium-catalyzed addition reaction of 1-carboranyltributylstannane (4) to azulene aldehydes (3 and 9). Although the water solubility of 1 was of the or…
A new electron-deficient tentacle porphyrin meso-tetrakis[2,3,5,6-tetrafluoro-4-(2-trimethylammoniumethylamine )phenyl]porphyrin (TthetaF4TAP) has been synthesized. The binding interactions of TthetaF4TAP with DNA polymers were studied for comparison to those of an electron-deficient tentacle porphyrin and an electron…
Epitaxially grown Pb(Zr, Ti)O 3 (PZT, Pb:Zr:Ti=1:0.52:0.48) thin films were prepared on Nb-doped SrTiO 3 (100) substrates by dipping-pyrolysis process with metal naphthenates used as starting materials. The alignments of the films were investigated based on X-ray diffraction (XRD) θ–2θ scans, β scans (pole figures), a…
The infinite hierarchy of differential-recurrence relations for the equilibrium transverse correlation functions appropriate to magnetic relaxation of single-domain ferromagnetic particles with uniaxial anisotropy subjected to a uniform external magnetic field ${H}_{0}$ is derived by averaging Gilbert's equation. Exac…
Domains in certain Langmuir monolayers support a texture that is the two-dimensional version of the feature known as a boojum. Such a texture has a quantifiable effect on the shape of the domain with which it is associated. The most noticeable consequence is a cusplike feature on the domain boundary. We report the res…
This article examines the effects of the soft-segment composition on the structure and physical properties of waterborne polyurethane (WBPU) based on polycaprolactone–poly(ethylene glycol)–polycaprolactone (PCL–PEG–PCL) triblock copolydiol as the soft segment. The molecular weight of PEG in the soft-segment compositio…