Materials Literature
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The motion of molecules on solid surfaces is of interest for technological applications such as catalysis and lubrication, but it is also a theoretical challenge at a more fundamental level. The concept of activation barriers is very convenient for the interpretation of experiments and as input for Monte Carlo simulat…
Single crystals of the systems ${\mathrm{Pr}}_{0.5}({\mathrm{Ca}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{)}_{0.5}{\mathrm{MnO}}_{3},$ $({\mathrm{Pr}}_{1\ensuremath{-}y}{\mathrm{Y}}_{y}{)}_{0.5}({\mathrm{Ca}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{)}_{0.5}{\mathrm{MnO}}_{3},$ and ${\mathrm{Sm}}_{0.5}{\mathrm{Sr}}_{0.5}{\math…
X-ray absorption spectra in a wide energy range around the 4d-4f excitation threshold of Gd were recorded by total electron yield from in-plane magnetized Gd metal films. Matching the experimental spectra to tabulated absorption data reveals unprecedented short light absorption lengths down to 3 nm. The associated rea…
The addition of transition metal elements can significantly modify physical properties of intermetalic compounds. We studied the influence of Molybdenum and Vanadium additives on thermal expansion coefficient (CTE) of Fe/sub 3/Al and FeAl over the wide range of temperatures. The site preference of both transition meta…
The conductance of {\em cis/trans} isomers of stilbene molecules connected to armchair single wall carbon nanotubes is studied in the Landauer formalism combined with a density-functional based approach. For a given arrangement of the electrodes, dramatic differences in the transmission between both isomers are found.…
The ground state of an electrorheological (ER) fluid has been studied based on our recently proposed dipole-induced dipole (DID) model. We obtained an analytic expression of the interaction between chains of particles which are of the same or different dielectric constants. The effects of dielectric constants on the s…
Influence of number of particles considered in numerical simulations on complex dielectric permittivity of binary dilute dielectric mixtures in two-dimensions are reported. In the simulations, dodecagons (polygons with 12-sides) were used to mimic disk-shaped inclusions. Using such an approach we were able to consider…
BACKGROUND: Restenosis is a serious complication of coronary angioplasty that involves the proliferation and migration of vascular smooth muscle cells (VSMCs) from the media to the intima, synthesis of extracellular matrix, and remodeling. We have previously demonstrated that tissue factor-targeted nanoparticles can p…
A first-principles approach to the nonlinear flow of dense suspensions is presented which captures shear thinning of colloidal fluids and dynamical yielding of colloidal glasses. The advection of density fluctuations plays a central role, suppressing the caging of particles and speeding up structural relaxation. A mod…
PART ONE. PRINCIPLES OF CONSTRUCTION COMPOSITE MATERIALS, INTEREST AND PROPERTIES What is Composite Material Fibers and Matrix What can be Made Using Composite Materials? Typical Examples of Interest on the Use of Composite Materials Examples on Replacing Conventional Solutions with Composites Principal Physical Prope…
Untreated and iron-coated refractory ceramic fibers (RCFs) 1, 3, and 4 were examined for their potential to generate free radicals and to catalyze hydrogen peroxide decomposition in cell-free assays and were compared for cytotoxic and transforming potencies in Syrian hamster embryo (SHE) cell system. Coating with a hi…
The purpose of this study was to evaluate the stability of thiolated polymers - so-called thiomers. A polycarbophil-cysteine conjugate and a chitosan-thioglycolic acid conjugate were chosen as representative anionic and cationic thiomer. The thiol group bearing compounds L-cysteine and thioglycolic acid were introduce…
Dielectric behavior and electric strength of polymer films are dependent on various factors. In this paper, an experimental study is presented on the dielectric behavior of polymer films under high frequency voltages and thermal stresses. The AC electric breakdown strength of thin polymer films as a function of sample…
New insulation products should be compatible with existing materials and techniques when employed by repair shops. Their unique characteristics should extend service life and improve the performance of rebuilt machines. Rotating machinery engineers must evaluate potential advantages of improved materials against appli…
Thermoelectric conversion (TEC) presents several advantages compared to the other energy conversion technology: it is reliable, can operate untainted in hostile environments, and is also environmentally friendly. However the application has been limited up to now because of the relatively low conversion efficiency of…
Today's thermoelectric module (TEM) users are experiencing a growing world marketplace filled with new or undiscovered sources for components. Selecting the right thermoelectric module supplier for a particular application is not as easy as it once was. New applications in thermoelectrics are occurring faster now than…
Electrothermal (ET) plasma sources, such as the SIRENS facility at North Carolina State University, have been used to simulate disruption heat loads because magnitudes and physical mechanisms of heat transfer in the ET source are similar to those in a tokamak disruption. Changes to the SIRENS facility at NCSU have all…
The application of variable frequency drives (VFDs) in industrial and commercial facilities has seen a tremendous increase in the last decade. When multiple VFDs are fed from one dedicated power transformer, care should be taken not to drive the transformer into saturation. At one industrial location, nine VFDs rated…
The United States Air Force is in the process of developing magnetic bearings as well as an aircraft integrated power unit and an internal starter/generator for main propulsion engines. These developments are the driving force for the new emphasis on high temperature, high strength magnetic materials for power applica…
Permanent magnet blocks of NdFeB have a relatively high maximum energy product. Because of its relatively low Curie temperature, however, NdFeB has a large temperature coefficient for its residual induction. The temperature coefficients of the relative magnetic fields (/spl Delta/B/B)//spl Delta/T in the air gap of Nd…