Materials Literature
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Cotton offers next-to-skin comfort and hence is a preferred fiber for undergarments. There have been a number of studies on the effect of different fiber types, fabric structure, fabric finishes, etc. on the moisture vapor transport properties. However, there has been no report in the public domain on the relationship…
Electrospinning is a technique to produce nanofibers more efficiently. In electrospinning, electricity spins fibers by extracting the polymer from the solvent and stretching it, all in one continuous electric field. Basics of electrospinning are discussed in sequence from simple homogenous fibers through a single nozz…
Preparation methods of calcium sulphate and urea adduct The paper presents the results of laboratory studies on the preparation of calcium sulphate and urea adduct by: grinding, compacting and mixing in the presence of physical water. A method for the measurement of urea conversion into the adduct form, which is based…
Abstract 7-[{Bis(carboxymethyl)amino}coumarin-4-yl]methyl-caged neurotransmitters (glutamate and GABA) were synthesized. Both caged compounds showed sufficient stability in the dark, were water-soluble at pH 7.2 without using organic solvents, and exhibited relatively high quantum yield for photolysis upon irradiation…
Medical licensees are required to comply with U.S. Nuclear Regulatory Commission (NRC) regulations pertaining to the release of patients administered radioactive material. However, use of the associated NRC guidance expressed in NUREG-1556, Volume 9, is completely optional and has been shown to be overly conservative.…
Os materiais refratários contendo carbono têm despertado grande atenção nos últimos anos, uma vez que são amplamente utilizados na indústria siderúrgica em virtude de suas excelentes propriedades. A presença do carbono nos refratários contribui para o aumento da resistência ao choque térmico, da energia de fratura e d…
Abstract The pearceite-polybasite group of minerals, general formula [M 6 T 2 S 7 ][Ag 9 CuS 4 ] with M = Ag, Cu; and T = As, Sb, show a crystal structure which can be described as the succession, along the c axis, of two pseudo-layer modules: a [M 6 T 2 S 7 ] 2– A module layer and a [Ag 9 CuS 4 ] 2+ B module layer. C…
Osakaite, ideally Zn 4 SO 4 (OH) 6 ·5H 2 O, is a new mineral species that occurs on the gallery wall and in cracks in altered shale at the Hirao mine, Minoo City, Osaka Prefecture, Japan. The mineral is found as stalactitic aggregates of hexagonal platy crystals up to 0.5 mm across and 0.01 mm in thickness. The associ…
Phonon dynamics of type-I clathrates Ba 8 Ga 16 Ge 30 has been studied at room temperature by inelastic neutron scattering for energy less than 9 meV. Optical phonons associated with large vibrations of Ba atoms filled in large tetrakaidecahedral cages are observed around E = 4.5 meV. Analysis based on a Born-Von Kárm…
An orthogonally protected dendrimer based on melamine displaying 24 Boc-protected amines (Boc is t-butoxycarbonyl) and 12 Dde-protected (Dde is N-2-(4,4-dimethyl-2,6-dioxocyclohexylidene)ethyl) amines was synthesized using a convergent route in four linear steps in 43% overall yield to provide 5 g of product. Postsynt…
Polyhydroxyalkanoates (PHAs) form an enlarged family of biopolyesters, which are biocompatible, biodegradable and non-toxic. Polyhydroxyalkanoates biodegradation corresponds to a hydrolysis involving endo- or exo-enzymatic systems in the breaking cleavage of esters bonds. This type of degradation is needed for environ…
Possible pathways and mechanisms of photoinduced relaxation processes in CdSe and CdSe/ZnS nanocrystals that are surface-passivated (as a result of two-point interactions) by nitrogen-containing ligands of different nature (pyridyl-substituted porphyrin molecules and their derivatives, 2,2′-dipyridyl, and 1,10-phenant…
Fast uncooled GaSe and InSe detectors that can record ultrashort (10 −12 –10 −9 s) laser pulses in the visual and near-IR ranges are developed. The quick response of the detectors is due to rapid recombination channels with a high capture cross section present in the crystals.
This paper presents a comparison of iron loss with sinusoidal supply (50 Hz) 1-phase square wave inverter supply 1-phase bipolar PWM inverter and 1-phase unipolar PWM inverter. In the experiment, using 0.5 mm.-thick Non- oriented magnetic steel and by setting equal maximum fundamental magnetic density for each test pr…
Abstract In weaving, a warp must withstand repeated stretching, caused by shedding and beat-up. It is also subjected to abrasion, which is mainly due to shedding and reed motion. The yarns are therefore sized. Two important reasons for applying sizes to spun warp yarns are to protect them breaking during weaving and t…
Abstract Human comfort perceptions in relation to textiles are influenced by tactile perceptions, moisture and thermal interactions. Studies in the thermal comfort of clothing have been done with instrumental techniques as well as with human subjects. There have also been many studies on influence of thermal comfort a…
The strain-mediated magnetoelectric coupling in piezoelectric-piezomagnetic composites with arbitrary spatial arrangement of particles of constituent phases is investigated. The free energy of such a composite is formulated as a functional of a phase field that is a shape function describing a spatial distribution of…
Deformation-induced crystallization of living polymer sulfur was studied with in situ wide-angle X-ray scattering, where chain scission plays a critical role. The onset of crystallization always occurs at the minimum stress point after the yield point, though different drawing rates were applied. With large drawing ra…
Caulinita é um argilomineral comumente encontrado nas frações finas de solos tropicais e subtropicais do Sul do Brasil. Em difratometria de raios X, sua presença é verificada pelo pico correspondente à distância 00l de d = 0,715 nm. Contudo, em alguns solos pode-se observar pico superior a d = 0,720 nm, correspondendo…
Evolution of morphology change was investigated for ZnO nanoneedle array grown by low-temperature MOCVD. Well-aligned ZnO nanoneedle array was deposited on the ZnO buffer-film/ Si substrate at temperatures below 500°C. A rod-shaped ZnO nanowire in the initial growth stage changed into needle-shaped as the deposition p…