Materials Literature
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The working principles of the hot-electron graphene base transistor (GBT) for analog terahertz operation have been investigated by means of a self-consistent Schrodinger-Polsson solver code. Its regions of operation are defined and discussed. With the help of a small-signal model, it is shown that the cutoff frequency…
Phosphostrontium carbonate hydroxyapatites having the general formula Sr 10 (PO 4 ) 6 (OH) (2-2x) (CO 3 ) x were prepared by solid gas reaction at different temperatures in the range 0 ≤ x ≤ 1. Infrared spectroscopy investigation reveals a carbonate groups substituting hydroxyl ions. Intensity bands increasing with th…
This study examines the properties of in situ SiNx surface-passivated enhancement-mode (E-mode) AlGaN/GaN high electron mobility transistors that are made with refractory titanium tungsten (TiW) and traditional nickel gate metals. Traditional Ni/AlGaN Schottky interfaces form intermixing states under a thermal stress…
The basic design equations of current probes for high-energy impulse measurements are derived and experimentally verified. In particular, attention is here paid on the minimization of impulse distortion due to saturation effects of the magnetic core and high-pass response of the probe.
Pure and Aluminium-doped ZnO (Zn1-xAlxO) x = 0 to 5 wt% thin films were deposited onto glass substrate by sol-gel spin coating method. The influence of various aluminium concentration in ZnO thin films on the structural, surface, optical and photoconducting properties were investigated. The GIXRD studies confirmed the…
PALF (pineapple leaf fiber) is one of the abundant sources that have been used for ages to be processed as different end product. The methods to extract the fiber are abounding. However comparisons between the machines are needed to ascertain the better function of machines and whether all natural fibers can be extrac…
ZnO nanoparticles were prepared by chemical method using starch as capping agent. Also the polyaniline-zinc oxide (PANI-ZnO) nanocomposites were prepared by in-situ polymerization of aniline monomer with ZnO nanomaterials. The structure and morphology of the ZnO nanoparticles were investigated by X-ray diffraction and…
The propagation of ultrasonic (US) waves in hydrogen-saturated alloy based on VT1-0 titanium is investigated. Two characteristic domains of the effect of hydrogen on velocity V R of US waves are established. A characteristic peak observed on the dependence of the velocity of US waves on the hydrogen concentration make…
Caulim é um produto originado pela ação do intemperismo de silicatos de alumínio como os feldspatos, que na região amazônica é favorecida pelo clima quente e úmido. Usado na fabricação de materiais refratários, cimentos, fármacos, catalisadores, cobertura e enchimentos de papel e outras diversas finalidades. Este trab…
We describe low loss microstrip transmission line with compact coplanar waveguide transitions for sub-terahertz application. The conducting transmission line is fabricated on the surface of a thin cyclic olefin copolymer dielectric layer. A vector network analyzer (VNA) has been used to obtain the transmission paramet…
Two different E-glass fiber reinforced plastic (GFRP) composite laminates having quasi isotropic [(+45/-45/0/90)2]S layup sequence were fabricated viz., GFRP with neat epoxy matrix (GFRP-neat) and GFRP with modified epoxy matrix (GFRP-nano) containing 9 wt. % of CTBN rubber micro-particles and 10 wt.% of silica nanopa…
Abstract Reliability and durability assurance poses a serious challenge for surgical instruments manufacturers. Hard working conditions, such as intermittent contact with body fluids and hard bone tissues, as well as necessity to undergo frequent sterilisation processes, induce constant research into solutions capable…
The texture and microstructure of the central layers in alloy 1469 sheets and the orientations of hardening T 1 -phase precipitates are studied by X-ray diffraction, optical microscopy, and transmission electron microscopy. These studies and X-ray diffraction performed in asymmetric geometry demonstrate that the textu…
Bimetallic catalysts based a Co-Fe/carrier system are prepared via the consecutive and combined deposition of metals on Al 2 O 3 and MgO · Al 2 O 3 . The dynamics of CO hydrogenation at 300°C is studied.
The use of graphene as an electrode stimulating field emission in vacuum micro-and nanoelectronic devices is investigated. Such an application of graphene becomes possible due to its high conductivity, mechanical strength, and transparency to electrons that are incident normal to a surface.
The molecular dynamics simulation technique with many-body and semi-empirical potentials (based on the embedded atom method potentials) has been used to calculate the interactions of point defects with (1 1 1), (1 1 3), and (1 2 0) twin boundaries in Au at different temperatures. The interactions of single-, di-, and…
In this study the predictions and probabilities of calcium carbonate scale formation and corrosion occurrence inside Gumry Field Process Facilities (GFPF) and produced water injection process units (PWTP) was carried out. This was done calculating the Langelier Saturation Index (LSI), Ryznar Stability Index (RSI), Puc…
In this paper, we have applied the Lie algebraic model to nano-bio molecules to determine the vibrational spectra of different stretching and bending vibrational modes. The determined vibrational energy levels by the Lie algebraic model are compared with the experimental data. The results from the theoretical model ar…
CaP coating was successfully prepared on the ZK60 magnesium by electrodeposition. The CaP coatings show a DCPD phase structure with small amount of β-TCP phase. The surface morphology shows a typical dendritic structure and the deposition voltage has little influence on the Ca/P ratio. The corrosion resistance of ZK60…
The inhibition performance of nine imidazoline molecules against the corrosion of steel in 15 wt.% HCl and 3 wt.% HF solution was studied by weight-loss method, quantum chemical calculation, molecular dynamics simulation and the quantitative structure−activity relationship (QSAR) analysis. The quantum chemical calcula…