Materials Literature
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Dielectric spectroscopy, heat capacity spectroscopy (HCS), and differential scanning calorimetry (DSC) investigations in the αβ relaxation splitting region of a series of random copolymers of n -butyl methacrylate with styrene are reported. A separate onset of the α relaxation is dielectrically observed, about one fre…
The mode-coupling theory for ideal liquid-glass transitions is extended so that the structural relaxation for the reorientational degrees of freedom of a linear molecule, which is immersed in a system of spherical particles, can be described. Closed equations of motion for the correlation functions formed with tensor…
Curing bis(maleimide)/diallylbisphenol A (BMI/DABPA) results in the formation of a high-temperature thermoset resin. FT-IR, fluorescence, and UV-reflectance spectroscopy were used to investigate the cure behavior of this material under three different cure schedules. Fluorescence signals were quenched before curing du…
Absorption and photoluminescence spectroscopic measurements are presented for particles with sizes from 2 to 4 nm, composition from y = 0 to 0.3,where y is given by Cd 1 - y Mn y S, and different preparation modes. No monotonous variation of bandgap energy with increasing composition is observed. The depth of the mini…
An enhancement mode diamond FET using a hydrogen-terminated surface as hole conductive channel has been fabricated with 200 V gate to drain breakdown voltage. At the 8.5-μm gate length the maximum drain current was 22 mA/mm. 90 mA/mm maximum drain current was obtained at a gate length of 3.0 μm. Scaling to below 1 μm…
This article reviews the various theories of adhesion mechanism and, more specifically, studies concerning foodstuffs adhesion to industrial equipment and packaging surfaces. Adhesion is governed by mechanical interlocking, wetting, electrostatic and chemical forces, and diffusion. Direct conclusions about the validit…
Abstract The gel content of rubber from high-ammonia latex (HA-latex) decreased significantly after deproteinization with proteolytic enzyme. The addition of 1–2% ethanol in toluene solution reduced the gel content of rubbers from HA-latex, deproteinized HA-latex (HA-DP) and pale crepe. Transesterification of the rubb…
A mathematical model of the discharge behavior of the nickel oxide/KOH/ battery system is presented. The model shows great sensitivity to the kinetic parameters of the nickel oxide active material. The thickness and porosity of the battery system's electrodes are optimized in terms of the specific energy and power of…
Despite the fact that the genus Aulacoseira Thwaites is a common component of phytoplankton communities in many North American water bodies, there are relatively few taxonomic based surveys utilizing the scanning electron microscope (SEM). In addition, based on the current literature, some species are difficult to ide…
Supported metal nanoparticles have been fabricated using electron beam lithography (EBL) and pulsed laser deposition (PLD). EBL produced ordered two-dimensional arrays with particle diameters of 40 ± 0.5 nm, uniform interparticle distances (230 ± 2 nm), and uniform height (20 ± 0.5 nm). Due to the narrow size distribu…
The energetics of various low-energy intrinsic, extrinsic, and twinlike stacking fault configurations in hexagonal-close-packed magnesium are determined from first-principles calculations. To zeroth-order, the ordering of the energies can be understood in terms of the number of fcc-like planes in the sequence of close…
Composites were prepared from methyl acrylate monomer and silica particles to which 3-(trimethoxysilyl)propyl methacrylate groups had been grafted. The silica particles were bonded onto poly(methyl acrylate) through participation of their methacrylate groups in the polymerization of the methyl acrylate to form an elas…
Introduction to organic laboratory techniques: a contemporary approach , Introduction to organic laboratory techniques: a contemporary approach , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
Theoretical foundations for the comparison of adsorption isotherms at the range of low surface coverages are presented in order to facilitate the use of this high-resolution comparative analysis for characterization of porous adsorbents. The well-known models of adsorption on heterogeneous and microporous solids were…
This paper addresses the worldwide research and development of HVDC cables with polymeric insulation. The unique features of the dc insulation characteristics of polyethylene are presented and discussed. The problems of using polymeric insulation in HVDC applications are presented and analyzed.
From a simple equation of motion for a linear chain, the phonon amplitudes for mobile and cage ions are represented in terms of their ionic radius and atomic mass. Estimated values of the amplitude in superionic conductors are larger for the mobile ions than the cage ions. Based on this result, many binary and ternary…
Detailed measurements of finite-amplitude pulses radiated by plane and focused circular pistons in water are presented. Comparisons of time waveforms and frequency spectra, both on and off axis, are made with numerical calculations based on the nonlinear parabolic wave equation. Emphasis is on nonlinear distortion of…
ZnS:Mn luminescent nanomaterials were first prepared in an inverse microemulsion at room temperature as well as under a hydrothermal condition. Mn-doped ZnS nanoparticles obtained are distributed from 3 to 18 nm in diameter as determined by transmission electron microscopy. The crystalline nature of the materials is c…
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Neutron reflectometry is used to study interdiffusion in bilayers of hydrogenated and deuterated poly(methyl methacrylate) (PMMA) on silicon substrates where the polymer−substrate interaction energy is strongly attractive. The effect of the polymer−substrate interaction energy on the interdiffusion rate as a function…