Materials Literature
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The electronic and optical properties of MgSxX1-x (X =Se, Te), and MgSexTe1-x (0 ≤ x ≤ 1) ternary alloys are investigated using the full potential linearized augmented plane wave (FP-LAPW) method within the density functional theory (DFT). The direct band gap energies vary in the ranges 2.854–3.864 eV, 2.470-3.864 eV,…
Hagendorf-North is a zoned Li-Nb-P-feldspar-quartz pegmatite located W of the village of Hagendorf and about 0.5 km north of the renown Hagendorf-South deposit which once was the largest feldspar pegmatite in Central Europe. Hagendorf-North also known as Meixner Mine was much smaller in size and its minerals assemblag…
The effect of quantum well states (QWS) formed in a Cu overlayer on the magnetic anisotropy of Fe and of Co films underneath is investigated at low temperatures. An oscillatory magnetic anisotropy is observed below 50 K, with a period of ${L}_{Cu}=5.8$ ML, and it is the same for Cu/Fe and Cu/Co. We attribute this effe…
Sol–gel chemistry has recently attracted a large attention with a view of preparation of silver-silica nano-composites for photo-catalytic applications. This method of synthesis allows glassy materials to be prepared at a much lower temperature than the traditional melt-glass techniques. Moreover, it enables higher do…
In this paper, we present the design, fabrication process, and testing results of an artificial hair cell sensor made by liquid metal encapsulated in a polydimethylsiloxane (PDMS) substrate. Previously, a flexible force sensor was reported from our group, which can detect both normal and shear forces by using liquid m…
The effect of nonsingular T -stress components on the plastic-deformation zone size near the tip of a mode I crack as a function of the sample thickness is analyzed theoretically and numerically. The calculations are performed for compact samples of three thicknesses. The plastic-deformation zone size in the middle pl…
It has been suggested recently that electron associative detachment from negative atomic oxygen ions provides an additional source of free electrons in electric discharges of the mesosphere, the sprites, and gigantic jets. Here we study attachment under some simplifying assumptions and show that the threshold field de…
In this paper, two transmitarrays are designed, analyzed, and simulated for satellite applications. The first transmitarray is designed for dual linear polarization at a center frequency of 12 GHz. The second transmitarray is designed for two frequency bands: 17.15 GHz to 17.9 GHz for vertical polarization and 11.5 GH…
The paper is reviewing the patents and journal papers treating catalysis and engineering issues involved in the dimethyl ether (DME) production from synthesis gas. The necessary catalysts include components active for the two reactions defining this process: carbon oxides hydrogenation to methanol and methanol etherif…
Computer simulations for several alkane fluids were carried out to study thermodynamics and structural behavior of the molecules at the liquid-vapor interface. Three different models were used to simulate the fluids, one of them was proposed in this work and we obtained a slightly better agreement than the other model…
First-principles calculations are in wide use today to describe chemical processes occurring on the silicon (001) surface. The number of atoms that can be explicitly treated is limited and hence size-constraints are invariably required;this applies to both cluster and periodic slab approaches. Using a trial set of sev…
Two percolation transitions are observed in Agx(SnO2)1−x nanogranular films with Ag volume fraction x ranging from ∼0.2 to ∼0.9. In the vicinity of each percolation threshold xci (i=1,2), the variation in σ with x obeys a power law for x>xci. The origin of the first percolation transition at xc1 (xc1>xc2) is similar t…
Both MOL PC-CA spacer dielectric and BEOL low-k dielectric breakdown data are commonly convoluted with multiple variables present in the data due to the involvement of many process steps such as lithography, etch, CMP, cleaning, and thin film deposition. With the continuing aggressive scaling of device dimensions and…
In this paper, the thermo-viscoelastic properties of hot and warm asphalt mixtures from South Dakota, USA, were determined from direct measurements of thermally induced stress and strain. The approach to determine the relaxation modulus, viscous flow, viscous-glassy transition, glassy hardening, crack initiation, and…
This article shows the development and implementation of a software that calculate the chloride penetration profile in concrete obtained using traditional Portland cements and cementitious mixtures from the addition of pozzolanic materials such as silica fume, metakaolin, fly ash, etc. The software calculates the pene…
In this work a combined experimental/numerical approach to describe the thermo-mechanical behavior of power devices under repetitive power pulsing is presented. Stress tests have been carried out on power DMOS implemented in Smart Power BCD technology with different Back-End Of Line (BEOL) schemes, including, for the…
Surface activation of polyethylene (PE) samples has been carried out using low pressure plasmas (at two different operating frequencies, namely, 40 kHz and 13·56 MHz) and dielectric barrier discharge (DBD) (50 Hz frequency and at atmospheric pressure), and the results are compared. The surface of the PE samples has be…
The effect of water content (0.5%, 1%, 2%, 5%, 10% y 20 V%) in E95 blend (5 V% gasoline – 95 V% ethanol) on the stress corrosion cracking (SCC) susceptibility of X-52 carbon steel was investigated. Slow strain rate tests (SSRT) coupled with electrochemical noise measurements (ECN) were carried out using a strain rate…
We report in this study the formation of low-biofouling polysulfone (PSf) membranes by vapor-induced phase separation. Membranes were prepared by blending an amphiphilic additive, Pluronic F108, Pluronic F127 or 3-(N,N-Dimethylmyristylammonio)propane-sulfonate (DMMSAPS) with PSf, before inducing phase separation of th…
Uncertainties in the doses estimated for the members of the Techa River Cohort (TRC) are being estimated with a two-dimensional Monte Carlo approach. In order to provide more accurate and precise estimates of individual dose (and thus more precise estimates of radiation risk) for the members of the TRC, a new dosimetr…