Materials Literature
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The objective of this studywas to assess the importance of actuator hysteresis on vibration and noise reduction in a rotorcraft equippedwith an actively controlledflap (ACF) system.Ahysteresismodel, based ona generalized formof the classical Preisach model, was developed using experimental data. The model displays goo…
Intensive studies were reported on the osteogenesis of mesenchymal stem cells (MSC) using chemicals and mechanical loading. However, the maturity of differentiated osteoblasts is not same as that of isolated adult osteoblasts. Thermal treatment could be a missing factor in stem cell differentiation. It was reported th…
The ultrasonic treatment of Fe 2 -Bi-Mo 2 -O x catalyst of ethylbenzene oxidative dehydration to styrene has been studied. Its physico-chemical properties have been compared with those of non-activated catalyst before and after operation. It has been shown that the catalyst prepared from salts solution activated by ul…
The use of steel has steadily increased in the recent days especially in ship building, automobile industry and in power plants. The microstructure of these steels consists of a variety of different phase and which leads to superior material properties - a combination of high strength with good formability. For the de…
In this study, a plastic hardening constitutive equation for steels of polar class vessels at low temperature is proposed. The equation was derived using the experimental data obtained from tensile tests at room and low temperatures. Tensile tests at low temperature are both costly and time consuming because an expens…
Using millimeter wave spectroscopy and numerical simulations we extract the effective parameters of a layered metamaterial made from split ring resonators. In agreement with recent theoretical considerations the effective model for a bulk metamaterial strongly contradicts the experimental spectra. In contrast, the des…
The 5-parameter Morse potential (5-MP) method for the interaction between O atom and Cr surfaces is constructed in the present work. The adsorption of O on Cr (100), (110), (111), and (211) surfaces are studied with 5-MP in detail. The fourfold hollow site of the Cr (100) surface is favored for O atom. On Cr (110), qu…
The dependence of the etch mechanism of lithographically seeded macropores in low-doped p-type silicon on water and hydrofluoric acid (HF) concentrations has been investigated. Using different HF concentrations (prepared from 48 and 73 wt.% HF) in organic electrolytes, the pore morphologies of etched samples have been…
Neste trabalho foram preparados filmes de nanocompósitos de polipropileno (PP) contendo 1% em massa de bentonita modificada organicamente com tecnologia nacional (APO). Polipropileno enxertado com anidrido maleico (PP-g-AM) e copolímero de etileno e álcool vinílico (EVOH) foram utilizados como agentes compatibilizante…
Cu ( In , Ga ) Se 2 films were successfully synthesized via employing H 2 SeO 3 as a new Se source. Direct heating in a reducing atmosphere at 350°C without using Se vapor yielded monophasic Cu ( In , Ga ) Se 2 . H 2 SeO 3 was completely dissolved in the starting solution, leading to an improvement in homogeneous mixi…
Four new compounds, [Mn(HL)(phen)2(H2O)] (1), [Ni(HL)(phen)2(H2O)] (2), [Zn(HL)(4,4′-bipy)1.5(H2O)] n · 2nH2O (3) and [Zn2(HL)2(H2O)6] (4), have been synthesized from an asymmetric semi-rigid V-shaped multicarboxylate 4-(4-carboxy-phenoxy)-phthalic acid (H3L) with 1,10-phenanthroline (phen), or 4,4′-bipyridine (4,4′-b…
Actuation by magnetically induced reorientation (MIR) in a Ni–Mn–Ga single crystal. The contrast in polarization microscopy originates from variants with different orientations. The video shown online is by courtesy of Ryan Lai and Jeffrey McCord.
We have fabricated a field effect transistor structure using the charge-ordered (CO) organic material α-(BEDT-TTF) 2 I 3 to investigate the effects of electrostatic carrier injection. We have observed both n -type and bipolar behaviors in the CO state, whereas, previously, only n -type characteristics were reported. T…
Abstract Cadmium sulfide (CdS) nanosheets were synthesized by an environment friendly, “green” organic molten salt (OMS) method at 220 °C. The as‐synthesized products were characterized by X‐ray diffraction (XRD), scanning electron microscopy (SEM), Transmission electron microscopy (TEM) and energy dispersive spectros…
Abstract The lead fluoridooxidovanadates(V), Pb(V 2 O 2 F 8 ) and Pb(VOF 5 ), were synthesized from PbF 2 and VOF 3 in anhydrous HF. Their crystal structures were determined and Raman spectra recorded. Compound Pb 3 F(V 4 O 3 F 18 ) with a novel mixed valent vanadium(IV, V) fluoridooxido anion, V 4 O 3 F 18 5– , obtai…
A new layered indium selenide, [C(7)H(10)N][In(3)Se(5)] (1), has been prepared solvothermally using 3,5-dimethylpyridine as a solvent and structure-directing agent. This material, which was characterized by single-crystal and powder X-ray diffraction, thermogravimetric analysis, UV-vis diffuse-reflectance spectroscopy…
The pathways of proton abstraction (PA), a key aspect of most catalytic reactions, is often controversial and highly debated. Ultrahigh-resolution diffraction studies, molecular dynamics, quantum mechanics and molecular mechanic simulations are often adopted to gain insights in the PA mechanisms in enzymes. These meth…
Abstract The electrical properties and dispersion of vapor‐grown carbon nanofibers (VGCNF) and multiwalled carbon nanotubes (MWCNT)—epoxy resin composites are studied and compared. A blender was used to disperse the nanofillers within the matrix, producing samples with concentrations of 0.1, 0.5, and 1.0 wt % for both…
Single‐phased Ag In Se 2 thin films were successfully prepared via depositing sol‐gel derived precursors, followed by a selenization process. The pure‐phased Ag In Se 2 thin films were obtained at a selenization temperature as low as 400°C via adding the excess amount of In 3+ ions. Adjusting the In 3+ / Ag + molar ra…
The effects of temperature on the structural behavior of polar class vessels have been experimentally and numerically investigated. Experiments were carried out on single frame structures made of steel material, DH36, which is used for outer shell of the vessels making transit through the polar region. A knife edge ty…