Materials Literature
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An experimental system was constructed in accordance with the standard ASTM C835-06 to measure the total hemispherical emittance (emissivity) of structural materials of interest in very high temperature reactor (VHTR) systems. First, data were acquired for 304 stainless steel as well as for oxidized and unoxidized nic…
The Met-542 residue of β-galactosidase is important for the enzyme's activity because it acts as a guide for the movement of the benzyl side chain of Phe-601 between two stable positions. This movement occurs in concert with an important conformational change (open vs. closed) of an active site loop (residues 794-803)…
The electrooptic characteristics of the field-induced reorientation of a nematic liquid crystal are studied using graphene layers as transparent conductive electrodes. The covering of a large area with highly conductive graphene was achieved by the thermal reduction of a graphene oxide film. The conductivity of the gr…
The conduction process during degradation, promoted by the application of fixed dc bias voltage at different temperatures (thermal steady states) and current pulses 8/20 μs on ZnO and SnO2-based varistors, was studied comparatively in the present work. The electrical properties of the varistor systems were highly dama…
This paper investigates and realizes the self-sensing capability of shape memory alloy (SMA) actuators. SMA exhibits large stroke, high energy density, and requires low driving voltage. To make SMA more applicable to small scale robotic manipulations, its motion control using accurate self-sensing is necessary. The pr…
A numerical technique, which combines FEM analysis of electrode area with matrix formalism applied to spectral domain analysis (SDA) of eigen modes in multi-layered substrate and multi-layered dielectric upper half-space, is described as an efficient tool of investigating the wave characteristics in periodic metal gra…
Fatty nitrogen compounds (FNCs); fatty amides (FAs), fatty hydroxamic acids (FHAs), and N,N′-carbonyl difatty amides (CDFAs), which were synthesized from palm oil, have been used as organic compounds to modify a natural clay (sodium montmorillonite). The clay modification was carried out by stirring the clay particles…
BACKGROUND: The influence of nanoparticles on the immune system is poorly understood. It was recently shown that exposure to a mixture of nanodiamond (ND)- and nanoplatinum (NP)-coated material (DPV576-C) activates murine T-cells. This study examined the role of a dispersed aqueous mixture of ND/NP (DPV576) in activat…
The shape memory deformation in single crystals of Ni 49 Fe 27 Ga 18 Co 6 alloy under uniaxial compression conditions has been studied. It was found that samples in the martensite state deformed in the [110] and [100] directions exhibit strongly anisotropic properties. Despite virtually equal residual strain and the w…
We have studied the electrical resistivity, magnetization, and heat capacity of the off-stoichiometric Heusler alloys Ni50Mn35In15 and Ni50Mn34.5In15.5 as functions of temperature and magnetic field. The results show that the alloy system is more sensitive to the composition than what is apparent from the established…
This study presents a simple yet effective hydrothermal route for selective generation of (Gd1-xEux)2O3 (x=0.03-0.13) redphosphor nanorods and nanotubes. Detailed characterizations of the products were achieved by combined means of XRD, FT-IR, TGA/DSC, BET, FE-SEM, HR-TEM, PL/PLE, fluorescence decay analysis, and tran…
Abstract We report an effective method for bulk obtaining exfoliated graphene oxide (GO) solids from their aqueous solutions, which were prepared from nature graphite by an oxidation method. Tyndall effect proved that GO solution has a colloidal nature. Different flocculants were used to coagulate GO colloidal, and it…
One important factor affecting crevice corrosion of passive metals is the crevice geometry, e.g., the gap of the crevice. The crevice geometry can be affected by the properties of the materials used as the crevice formers, i.e., a polymeric crevice former can conform to the surface roughness of a metal specimen, which…
The anticorrosion performances of new non-toxic inhibitors based on carboxylic acids extracted from vegetable oil have been evaluated for the protection of iron artefacts. Electrochemical measurements and natural aging tests have demonstrated the efficiency of those inhibitors in the context of temporary treatments. S…
We reported optical properties of a-plane ZnO/ZnMgO multiple quantum wells (MQWs) structure grown by the pulse laser deposition system. The emission peak energy of a-plane ZnO/ZnMgO MQWs kept invariant in the power-dependent photoluminescence (PL) measurement, indicating the nonpolar characteristics due to the lack of…
Abstract The structure of hibonite from Myanmar (space group P 6 3 / mmc , Z = 2, at room temperature a = 5.5909(1), c = 21.9893(4) Å), with simplified formula CaAl 12 O 19 and composition (Ca 0.99 Na 0.01 ) Σ1.00 was investigated between temperatures of 100 K and 923 K by single-crystal X-ray diffraction methods. Str…
This paper presents the development of a micromachined high-frequency linear array using PZT piezoelectric thick films. The linear array has 32 elements with an element width of 24 μm and an element length of 4 mm. Array elements were fabricated by deep reactive ion etching of PZT thick films, which were prepared from…
The microstructural and electrical-property changes of undoped and 5.4% nitrogen-doped Ge 2 Sb 2 Te 5 were investigated. The transition temperature of sheet resistance increased owing to nitrogen doping, which corresponded well with the observed phase-change states. The lattice parameters of the undoped and nitrogen-d…
Treeing in polyethylene based nanocomposite samples as well as unfilled polyethylene samples were studied using 50Hz ac voltage. The tree inception voltage was observed for different types of samples. The tree initiation time as well as the tree growth patterns at a fixed ac voltage have also been studied. The results…
Model nanocomposites on the basis of specially synthesized amorphous and semicrystalline polyimide matrices, silicate (natural and synthetic) and carbon nanoparticles with different morphology (tubes, platelets, discs, and spheres) have been developed. The influence of nanoparticle morphology on the rheological behavi…