Materials Literature
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The main types of brazing alloys used for brazing creep-resisting alloys and steels are investigated and their characteristics and main special features described. The aspects of the selection of brazing alloys for brazing different materials depending on the brazing conditions and the operating conditions of the comp…
We achieved annealing-induced optical-bandgap widening in Cu2ZnSnS4 (CZTS), which is a promising material for use in high-efficiency thin-film solar cells, and we performed synchrotron-radiation X-ray absorption fine structure (XAFS) measurements to study the reasons underlying the widening. CZTS thin-film samples wer…
The origin of a pseudogap in the underdoped phase of cuprates has become one of the leading issues in understanding the mechanism(s) of high- T c superconductivity. Several experiments (i.e. polarized neutron diffraction studies) support theoretical models based on the circulating current (CC) picture. These CC models…
A response time as short as 5.4 ms and an exponential gain coefficient as large as 1795.0 cm(-1) were obtained in C(60) doped 4,4'-n-pentylcyanobiphenyl liquid crystal cells sandwiched with two indium tin oxide glass plates coated with nanoscale photoconductive ZnSe films, which is believed to be facilitating charge-c…
The nitrobenzofurazan (NBD) moiety has gained tremendous popularity over the last decades due to its fluorogenic nature. Indeed, upon interaction with aliphatic amines, it generates a stable fluorescent adduct, which has been used for protein and lipid labeling. In fact the 4-amino substituted NBD belongs to the broad…
A new combination in the genus Planothidium is proposed. The identity of Planothidium lagerheimii (Cleve) C.E.Wetzel & Ector comb. nov. (≡ Cocconeis lagerheimii Cleve), from South America is revisited. This rather common species often reported from freshwater and aerial environments was identified in previous studies…
We compute the effective dispersion and vibrational density of states (DOS) of two-dimensional subregions of three-dimensional face-centered-cubic crystals using both a direct projection-inversion technique and a Monte Carlo simulation based on a common underlying Hamiltonian. We study both a (111) and (100) plane. We…
A numerical model has been developed for the performance analysis of solid oxide fuel cell (SOFC)/micro gas turbine (MGT) hybrid systems with prereforming of natural gas, in which a quasi two-dimensional model has been built up to simulate the cell electrochemical reaction, heat and mass transfer within tubular SOFC.…
A new developed device, computer cathodic orientation system, was tested to analyze functional properties of electroformed shells of nickel. Several applications, such as rapid tooling, may require thickness uniformity, where the tool or mold is made by electroforming, starting from the 3D model. This system enables t…
Sisal fiber is an important vegetable fiber used in the reinforcement of polymeric or cement based composites. During the fiber production process, however, it generates a large amount of waste which currently has a low potential for commercial use. In this work two types of residues, called field bush and refugo, wer…
Co1 − x Cu x Cr2O4 (0 ≤ x ≤ 1) ceramic samples have been characterized by room-temperature X-ray diffraction and relative dielectric permittivity ɛ(T) and loss tangent tanδ(T) measurements (at frequencies from 0.1 to 200 kHz) in the range 100–350 K. The samples were shown to consist of spinel solid solutions with a cu…
Integrity Management Program (IMP) for oil and gas pipeline system demands a robust risk assessment method, which needs fully utilize the expert knowledge on the empirical data and the ambiguous cause(s) – effect(s) failure mechanism and then keep a good balance between precision and practicality. A new method, Rule B…
Nanocomposites of PMMA/clay with new natural montmorillonite, noted AC, (from Algeria) at different content of inorganics (1, 3 and 5 wt%) were prepared by either in situ bulk radical polymerization of monomer or by ultrasonic dispersion of clay with preformed PMMA. The organomodification was achieved by ion exchange…
By generating electricity from microbially catalysed anodic oxidation processes, the greatest potential lies in the use of wastewater as a fuel, which allows wastewater treatment and energy recovery to be combined. A recent development has expanded the scope of bioelectrochemical systems from power generation and wast…
The structure and morphology of monodisperse spherical particles of (Y1 − x Eu x )2O3 solid solutions prepared through the low-temperature thermolysis of an amorphous precursor under isothermal conditions (t = 800°C) have been analyzed in detail in relation to the particle size and composition. The results demonstrate…
Abstract The effects of the compositions and tensile rates on the tensile properties of the polyformaldehyde (POM)/ethylene-vinyl acetate copolymer (EVA)/high-density polyethylene (HDPE) blends and POM/EVA/HDPE composites filled with nanometer calcium carbonate were investigated by means of a tensile test machine at r…
In the present study, monolithic zirconia was prepared using zirconyl oxalate sol as the precursor and urea-formaldehyde resin as the sacrificial template. Under optimal conditions, the as-prepared zirconia monolith demonstrated interconnected skeletons and textural pores (macropores). Nitrogen adsorption–desorption a…
The metallic ruthenium perovskites ACu 3 Ru 4 O 12 with A = Ca, Pr,Nd were investigated by zero field (ZF) and weak transverse field (TF) muon spin rotation/relaxation ( μ SR) spectroscopy. The ZF spectra for CaCu 3 Ru 4 O 12 show pure static Gaussian Kubo-Toyabe relaxation arising from the interaction between the muo…
We have investigated the superconductivity in splat-cooled UMo alloys by low-temperature resistivity and specific-heat measurements down to 0.4 K. The γ -U materials, such as U-Mo15 (with 15 at.% Mo doping), exhibit a conventional BCS superconductivity with T c = 2.1 K and upper critical field exceeding 5 T, much high…
The synthesis of water-dispersible nano-assemblies containing upconverting nanoparticles (UCNPs) and porphyrin molecules using a one-pot method is described. When the nano-assemblies are excited by 980 nm near-infrared light, the intensity of the 'green emission' band of the UCNP is reduced due to a combination of Fös…