Materials Literature
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Abstract A study was conducted to compare the two methods, Henriques Burn Integral and Stoll criteria, in thermal protective performance evaluation on firefighter clothing composites exposed to various thermal hazards. The thermal hazards that the firefighter may encounter during fire fighting are low level thermal ra…
The infrared spectra of xPbO (1-x-z)SiO 2 zP 2 O 5 glasses with a PbO:SiO 2 molar ratio of 3:2 and z=0,1,2,5,30,40 and 50 mol% have been examined in the region 4000-400 cm - 1 , together with XRD. The structure of PbO-SiO 2 binary glass is significantly different from that of P 2 O 5 substituted glasses. The low amoun…
In Picrophilus torridus, a euryarchaeon that grows optimally at 60 degrees C and pH 0.7 and thus represents the most acidophilic thermophile known, glucose oxidation is the first proposed step of glucose catabolism via a nonphosphorylated variant of the Entner-Doudoroff pathway, as deduced from the recently completed…
Microstructure and mechanical properties as well as thermal stability of commercially pure titanium VT1-0 subjected to severe plastic deformation by twist extrusion (TE) were studied before and after low-temperature annealing and cold rolling. TE leads to a refinement of structural fragments to sizes of less than 1 μm…
Optical switching effects of a guided-mode resonant grating (GMRG) with a Kerr medium have been simulated with the nonlinear finite differential time domain (FDTD) method. An asymmetric waveguide grating with a large second spatial harmonic component has been proposed for the optical switch. Resonant reflection occurs…
Abstract The novel europium complex acrylato(1,10‐phenanthroline)bis(2‐thenoyltrifluoroacetonato)europium( III ) [Eu(tta) 2 (aa)(phen)] [Eu‐AAPhen; Htta = 4,4,4‐trifluoro‐1‐(2‐thienyl)‐1,3‐butanedione, Haa = acrylic acid, phen = 1,10‐phenanthroline], which combines the excellent fluorescence properties of [Eu(tta) 3 (…
In an effort to understand the mechanisms of irradiation embrittlement of reactor pressure-vessel steels, hardening and microstructure evolution in a number of simple ferritic model alloys and complex bainitic steels irradiated with 3.2 MeV protons over a range of doses, dose rates and temperatures were characterized.…
Single crystals of hexagonal MnTe (in NiAs structure) have been grown by the physical vapour transport method and investigated by neutron scattering techniques. Lattice parameters and magnetic intensity of Bragg peaks characteristic of the antiferromagnetic order of the first kind have been measured by elastic neutron…
The optically active defects in as-grown, high-pressure high-temperature-treated (HPHT), borondoped, and synthetic diamonds (SD) grown with a nitrogen-getter, as well as of natural diamonds (ND), were characterized by absorption and luminescence spectroscopies using different excitation sources. The laser-excited phot…
The E. coli isozyme of gamma-aminobutyrate aminotransferase (GABA-AT) is a tetrameric pyridoxal phosphate-dependent enzyme that catalyzes transamination between primary amines and alpha-keto acids. The roles of the active site residues V241, E211, and I50 in the GABA-AT mechanism have been probed by site-directed muta…
This article summarizes recent studies of electron irradiation damage in sodium borosilicate, iron phosphate and aluminophosphate glass waste forms using a modern analytical electron microscope. Three different borosilicate (wt%) (17.72% B2O3–16.67% Na2O–64.61% SiO2, 17.78% B2O3–15.83% Na2O–61.39% SiO2–4.99% Fe2O3 and…
The purpose of this study was to investigate whether a single 1,350-mg dose of Panax notoginseng (PNG) could enhance aerobic capacity, endurance, and mean blood pressure (MAP) in young adults. We randomly assigned 29 untrained adults, aged 20-35 years, to an experimental (EXP, n = 13) or a control (CON, n = 16) group.…
The relation between pit morphology and microstructure formed during 850°C isothermal aging of UNS S31803 duplex stainless steel (DSS) could be reached through the explanation of pit nucleation and growth during potentiodynamic polarization in 3.5 wt% sodium chloride (NaCl) aqueous solution. Aging times up to 10 min a…
In this paper two methods for 3Dimensional modeling of the plain weft knitted structures are presented. The aim is models to be more realistic concerning yarn cross section properties. The first model is based on the assumption that yarn cross section changes to ellipse-like form in the areas with high curvature. The…
The effect on microstructure and electrical properties of (Co, Nb)‐doped SnO 2 varistors upon the addition of Pr 2 O 3 was investigated by scanning electron microscopy and by determining I – V , ɛ– f , and R – f relations. The threshold electric field of the SnO 2 ‐based varistors increased significantly from 850 to 2…
The crystallization kinetics in the glass system (100− x )LiBO 2 − x Nb 2 O 5 (5≤ x ≤20, in molar ratio) prepared via the conventional metal‐plate quenching technique have been studied by isothermal and non‐isothermal methods using differential thermal analyses. X‐ray powder diffraction studies carried out on heat‐tre…
The susceptibility to hydrogen of a X80 grade steel produced by a thermo-mechanical control process (TMCP) has been investigated by keeping straining notched specimens under continuous charging conditions. Hydrogen charging was carried out either in synthetic seawater under potentiostatic control at − 1000 mV vs. SCE…
The unique mechanical, electrical, and electrochemical properties of single-wall carbon nanotubes (SWNTs) and their versatility render these structures potentially promising for a number of structural biomedical applications. Among a series of critical parameters, such as the diameter and structure of the SWNT, its le…
Abstract The expression of molecular chirality during the self‐assembly of an amino‐acid‐based macrocyclic organogelator ( 1 ) has been studied. The gelation behaviour of enantiopure samples, as well as mixtures of both enantiomers, of this compound have been studied and important differences have been found between t…
MAX phases are promising materials for protective coatings on steel due to their unique combination of properties like corrosion and oxidation resistance, good electrical conductivity, low friction coefficient, damage tolerance, and high temperature stability. Here the deposition of large area MAX phase coatings on st…