Materials Literature
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The knowledge of partial discharge (PD) as a physical phenomenon has made considerable progress in the last decade(s). These efforts have led to a validated statistical-mathematical model able to simulate the PD behavior in dielectric bounded spheroidal cavities. Recent studies demonstrated that an approach based on s…
Double-layer electrochemical capacitors (EC), also known as ultra-capacitors or super-capacitors, are an emerging storage technology already being used for applications such as DC motor drives, UPS systems, and electric vehicles. The latest EC store enough energy to rival a lead-acid battery and can outperform batteri…
Abstract The preparation and properties of fourteen novel paramagnetic [Ni II x ] aggregates bridged by pivalate, pyrazolinolate and in most cases hydroxide are reported. A rich structural diversity has been achieved by changing the nature of the alkali of the base used during the synthesis, leading to the nuclearitie…
Conventional core loss estimation methods exhibit limitations in dealing with important aspects of switching power converter applications such as different duty cycles, discontinuous-conduction-mode, variable switching frequency, or variable duty cycle operation. These limitations are particularly evident when trying…
We describe how a large number of products are scheduled to run in parallel on a pool of wire-bond machines to meet weekly demand. We seek to maximize demand fulfillment subject to system constraints. The schedule is generated by a simulation engine and used to control the machines at execution time and also to plan f…
Halocarbons undergo catalytic destruction and mineralization with silver and gold nanoparticles in solution forming metal halides and amorphous carbon. The reaction, studied for several halocarbons and one chlorofluorocarbon, is efficient and complete destruction occurs within several hours at room temperature. The me…
Gradient elastic flexural beams are dynamically analysed by analytic means. The governing equation of flexural beam motion is obtained by combining the Bernoulli-Euler beam theory and the simple gradient elasticity theory due to Aifantis. All possible boundary conditions (classical and non-classical or gradient type)…
Two three-dimensional (3D) malonate bridged networks, [Cu(mal)(DMF)](n) (1) and [[Cu(mal)(0.5pyz)].H(2)O](n) (2), have been synthesized in H(2)O-DMF solution. Compound 1 exhibits ferromagnetic ordering below 2.6 K (T(c)), and 2 displays a metamagnetic behavior below 3.2 K (T(N)).
Compounds [Fe(tzpy)(3)](BF(4))(2) (1), [Fe(tzpy)(2)(NCS)(2)].S (S = 2CHCl(3) (2), H(2)O (3)), and [Fe(tzpy)(2)(NCSe)(2)] (4) (tzpy is 3-(2-pyridyl)[1,2,3]triazolo[1,5-a]pyridine) have been synthesized and characterized. 1 crystallizes in the monoclinic noncentrosymmetric system, Cc space group, Z = 4, with a = 11.4680…
Ultralong alkanes (C n H 2 n +2, n > 150) are generally considered as the most appropriate model for polyethylene, PE, and studies of these compounds can shed light on fine structural features of polymer crystals and the mechanisms of polymer crystallization. High-temperature atomic force microscopy was applied for co…
Fuel cells are a versatile, renewable energy source that can be used in a wide range of applications. In this paper, topologies for a 10 kW inverter system with a low voltage fuel cell input are evaluated based on simplicity, performance, and cost. This particular fuel cell system is intended for household stand-alone…
This paper reports a dramatic reduction of liquid droplet flow resistance by engineering the surfaces into nanomechanical hydrophobic structures that show a contact angle over 175/spl deg/. Flow resistances of droplets on open surfaces as well as in confined microchannels (between surfaces) have been measured with sig…
Starting with the mathematical modeling of classical problems of hysteretic phenomena, the author provides an insight into the physics of the inverse hysteresis, higher order reversal loops, accommodation, viscosity, creep, wasp-waisted loops and hysteretic coupled systems. Adopting a novel approach, he presents the T…
A new variation to the dry gel conversion method for the preparation of zeolite is introduced, where the conversion to zeolite was accomplished under water vapor below the saturation condition. The dry gel was made either by vacuum concentration or by surfactant flocculation from a silica precursor sol after the preli…
Recently, there has been significant interest in materials with simultaneously negative permeability and permittivity, also referred to as negative refractive index metamaterials. Metamaterials comprised of straight metal wires and split ring resonators operating in the long wavelength regime exhibit a microwave frequ…
A double-walled carbon nanotube is used to study the radial charge distribution on the positive inner electrode of a cylindrical molecular capacitor. The outer electrode is a shell of bromine anions. Resonant Raman scattering from phonons on each carbon shell reveals the radial charge distribution. A self-consistent t…
Carbon nanotubes are nanometer-scale materials with important properties, but their use in nanofabrication will require further development of methods for controlled positioning at well-defined locations on surfaces. We have devised an approach for specifically localizing single-walled carbon nanotubes (SWNTs) onto 1-…
We present a multitechnique (EPR, XANES, EXAFS, and IR of adsorbed NO) study of the coordination and oxidation chemistry of copper species hosted in mordenite (MOR) zeolite under different conditions. Starting from a 100% Cu 2+ −MOR, the progressive thermal activation causes first the loss of water molecules from the…
We develop continuum theory of self-assembly and pattern formation in metallic microparticles immersed in a poorly conducting liquid in DC electric field. The theory is formulated in terms of two conservation laws for the densities of immobile particles (precipitate) and bouncing particles (gas) coupled to the Navier-…
Summary form only given. Samples of gold nanospheres and nanorods are investigated in a conventional dark-field microscope For spectral investigations, the scattered light from single particles is focused with the microscope onto the entrance slit of a spectrometer coupled to a cooled CCD camera. This dark-field spect…