Materials Literature
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Nanocrystalline Ni 0.5 Zn 0.5 ferrite with average grain sizes ranging from 10 to 100 nm is prepared by using a spraying–coprecipitation method. The results indicate that the nanocrystalline Ni 0.5 Zn 0.5 ferrite is ferromagnetic without the superparamagnetic phenomenon observed at room temperature. Specific saturatio…
Rice straw fibres have been extracted and incorporated in polyester resin matrix to prepare rice straw reinforced polyester composites and the tensile and impact properties of the resultant composites studied. The rice straw fibres have a tensile strength of ~ 69.72 MPa and Young’s modulus of ~ 2427 MPa. The composite…
A computational pre-processing tool for generating initial configurations of molecules for molecular dynamics simulations in geometries described by a mesh of unstructured arbitrary polyhedra is described. The mesh is divided into separate zones and each can be filled with a single crystal lattice of atoms. Each zone…
Patients administered with a therapeutic dose of I for thyroid cancer treatment are potential sources of unacceptably high radiation exposure to other individuals, particularly the patient's immediate family members. Generally, patients are hospitalized until such time that the retained radioactivity in the body or th…
We report on the research effort towards the development of processes for the realization of magnetic tunnel junctions by atomic layer deposition. Our strategy follows two main schemes. The first is a hybrid process where the ferromagnetic layers are produced by chemical vapour deposition and the tunnel oxide is depos…
Low levels of lead are added to free cutting steels to improve machinability. For environmental reasons, there is interest in alternatives to lead that are technically and commercially viable. The machining performance of eight low carbon free cutting steels with alternative machinability enhancers, including addition…
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…