Materials Literature
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Advances in liquid crystal (LC) materials and VLSI technology have enabled the development of multi-phase spatial light modulators (SLM) that can perform high-resolution, dynamic optical beam positioning as well as temporal and spatial beam shaping in the 1550 nm optical communication window. These attractive features…
Surface charge accumulation on insulating materials, which are located next to electrodes in electrical devices may lead to a change of the electrical field. In some cases the breakdown voltage of electrode arrangements could be exceeded. For the investigations an insulating plate made from PTFE was used. The test set…
The synthesis and structure of the tautomeric Cd(II) isoindoline zwitterion coordination compound [Cd(4'-MeLH)(NO(3))(2)].CH(3)OH (4'-MeLH = 1,3-bis[2-(4-methylpyridyl)imino]isoindoline) are reported. In methylene chloride solution, tautomer interconversion occurs as the N-H proton moves between the identical imine ni…
This research studied the optimal design of shape memory alloy (SMA) muscle wire bundle actuators. Current literature describes the use of multiple muscle wires placed in parallel to increase the lifting capabilities of an SMA actuator, which however, is limited to wires of like-diameter. A constrained optimization pr…
The high frequency model of transformer winding is indispensable in analyzing the transients particularly caused by the very fast transients which occur at the time of disconnecting switch operations. The transients in transformer have been analyzed using a circuit of interlinked inductances and capacitances whose val…
As the components operating at high frequency and switch mode excitation, parasitic parameter extractions of power electronics magnetics, such as transformers, have many special issues. A parasitic capacitance related with leakage inductance and winding resistance in the lumped circuit model of a transformer is found…
Free-standing conductive films of organic−inorganic hybrids were prepared employing the sol−gel process of (3-glycidoxypropyl)trimethoxysilane (GPTMS) and water-borne conductive polyaniline (cPANI) in water/ethanol solution. The hybrids displayed a percolation threshold for electrical conductivity at a volume fraction…
To study in detail the interaction of copper atoms and clusters in various, potentially important catalytic oxidation states (Cu, Cu +, and Cu 2+ ) on polar surfaces, we have applied a hybrid QM/MM embedding model within the computational chemistry package ChemShell. Using the model, we study specific Cu/ZnO surface s…
A critical step toward the construction of complex architectures based on nanoscale carbonaceous materials is to interface these structures with other useful nanoscale building blocks. Herein we report the synthesis of a new class of binary nanomaterials from single-walled carbon nanohorns and nanoparticles by utilizi…
Epoxy-silicate nanocomposites were prepared by dispersing synthetic layered silicates modified with alkylammonium ions. In the dispersing process, the organically modified layered silicates were mixed in epoxy resin with shearing, and aggregations of the silicates were removed by centrifugal separation after mixing ep…
With a high-pressure gas treatment it is possible to force extra gas inside a cellular polymer film structure, expand the film and thus reduce the film stiffness. A permanent increase in the film thickness can be in the range of 100% when using ambient temperature of about 90/spl deg/C and gas pressure of about 20 bar…
The complexation between a polyion and an oppositely charged spherical macroion in the framework of the primitive model has been studied by the use of Monte Carlo simulations. The polyion length, linear charge density, and bare persistence length are varied systematically, while the properties of the macroion are kept…
The structure of gold cyanide, AuCN, has been determined at 10 and 300 K using total neutron diffraction. The structure consists of infinite [bond]Au[bond](CN)[bond]Au[bond](CN)[bond] linear chains, hexagonally packed, with the gold atoms in sheets. The Au-C and Au-N bond lengths are found to be identical, with d(Au(-…
A simulation model of a continuous disc type 6.6 kV transformer winding was used to study the propagation behaviour of partial discharge (PD) pulses. The model based on multi-conductor transmission line theory uses a single turn as a circuit element with the capacitance, inductance, and losses calculated as distribute…
Single-walled carbon nanotubes are efficiently cut to precise submicrometer lengths and very narrow length distributions. Chemical functional groups are placed selectively only at the ends without the nanotube walls being modified or damaged. The new methodology includes lithography to place protective photoresist pat…
This work tests the hypothesis that tridentate oxoanions are especially effective stabilizers of transition-metal nanoclusters when the O−O distance of the anions matches closely the M−M (M = metal) distance atop the nanocluster surface. Specifically, we test the hypothesis that HPO 4 2 - with its 2.5 Å O−O distance i…
Internet electronic products have requirements different from those of personal computers (PCs). The increasing importance of Internet electronics is driving changes in development of IC technology. One important characteristic of the Internet Age is computational disaggregation. Whereas, over the past 20 years, PCs h…
Surface hydrophobicity is one of the factors that contribute to the superior performance of polymer insulators when compared to porcelain. However, corona discharges that can be generated locally due to high electric field can destroy hydrophobicity and also contribute to the degradation of the insulator. This paper p…
After many years of development, liquid crystalline polymer materials are finally ready for significant use as a printed circuit board material. These materials have a ways had very attractive electrical and physical properties but were a challenge to be made into industry acceptable circuit boards. Through extensive…
This paper proposed a technique for estimating the parameters of three-phase induction motor in order to conduct on-site energy audits of existing motors, which are then used to project a cost savings. This proposed technique uses only a few sets of data (voltage, current, speed, power factor or torque if possible) fr…