Materials Literature
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Electrochromic properties of sputter-deposited nickel-based oxide films have been studied with a two-fold goal. From a practical point of view, the optical switching performance has been improved by optimizing the deposition conditions and film stoichiometry with respect to oxygen and hydrogen, and further by adding M…
Phase change in a simulated low gravity environment is the central topic of this research work. The application of a transverse magnetic field gives rise to Lorentz forces that can dampen the convective flows especially the buoyancy driven flows. The flow suppression depends on a dimensionless parameter namely the Har…
Chromium dissolution in aqueous sulfuric acid solutions in the pH range 0.5 ?3 was studied electrochemically by the potentiostatic or very slow potentiodynamic method, and by the analyses of the Cr ion concentrations in the electrolyte formed during the experiments. It was shown that the electrochemical anodic dissolu…
Ductile iron specimens of ∼3.5 mass% C and ∼2.8 mass% Si were austempered at 420°C for 0.5 h∼24 h. These upper bainitic austempered ductile iron (ADI) specimens were 90° -eroded by Al2O3 particles of ∼275 μm grit size under the average particle velocity of 73 m·s−1 to understand phase transformation at the erosion sur…
The crystal structure of a new polymorph, Form II, of β-D-allose has been determined by X-ray powder diffraction. The unit cell is hexagonal, a = b = 16.598 Å, c = 4.856 Å, α = β = 90°, γ = 120°, space group P62 with Z = 6, Z′ = 1. The molecule adopts the 4C1 chair-conformation, with a torsional change of conformation…
Amperostatic coulometry was applied for the thickness measurement of Sn-Ag hot dip coatings, which comprise an extended Sn-Cu interdiffusion layer. Complementary measurements, notably weight loss, X-ray photoelectron spectroscopy, energy-dispersive X-ray spectroscopy, X-ray fluorescence (XRF), and dynamic secondary io…
Dependence of fracture properties and hardening was examined as a function of helium production in tensile specimens of a martensitic steel F82H (Fe-8Cr-2W-0.1C-0.04Ta) irradiated at 300°C to 2.3 dpa by neutron irradiation in the JMTR (Japan Materials Testing Reactor). The specimens used in this study were F82H, F82H+…
By X-ray diffraction structure determination, together with Raman scattering, optical birefringence and low frequency dielectric measurements, ferrielectric phase transitions in regions of trigonal and monoclinic phases on a temperature—concentration diagram of CuInP2(SexS1−x)6 mixed crystals are investigated. The pha…
A novel compact structure suitable for the realization of a 2 × 2 bistable integrated optical switch using ferroelectric liquid crystal is reported. The switch consists of a vertical coupler formed by two Ag+-Na+ ion-exchanged single-mode channel waveguides diffused in two BK7 glass substrates of a surface stabilized…
This paper describes the behavior of hydrogen in iron chromium nickel alloys. The behavior of hydrogen was investigated by radioisotope of the hydrogen. The traces of hydrogen in the iron chromium nickel alloys were investigated by measuring the β-ray radiated from tritium. The β-ray can be identified by an auto radio…
The corrosion behaviour of electroless nickel-phosphorus (EN) coatings with phosphorus content ranging from 2 to 12.5 wt% was investigated using potentiodynamic (PT) and cyclic voltammetry (CV) techniques in 0.5M sodium hydroxide. It was found that although the corrosion resistance of EN coatings generally increased w…
Three model polyurethane hard segments based on dimethylol butanoic acid (DMBA) and 1,6-hexane diisocyanate (HDI), toluene diisocyanate (TDI) and 4,4'-diphenylmethane diisocyanate (MDI) were prepared by the solution method.Fourier Infrared (FTIR) spectroscopy was employed to study the H-bonds in these model polyuretha…
Chitin is a biopolymer. Theoretically, it is a homopolymer of acetyl-glucosamine. Chitosan is the deacetylated product of chitin. Chitin and chitosan have many applications in water purification, agriculture, food and pharmaceutical industries. Currently, industrial production for chitin and chitosan is from the shell…
(XXXVIIème supplément à Gallia Préhistoire)
Development of industrial nanocomposite permanent magnets (NCPM) is reviewed with a particular emphasis on rare-earth-iron-based materials. After a brief description of the basic concepts concerning NCPM, leading discoveries of iron-based NCPM are reviewed. The impact of recent development of high-coercivity Nd-Fe-B-T…
Sheets made from poly (butylene succinate) (PBS) were prepared by extrusion. They have been studied under uniaxial drawing as a function of the draw condition. Changes in molecular orientation and crystallinity were investigated using the criteria of differential scanning calorimetry (DSC), dynamic mechanical analysis…
2-Bromooctanoic acid (2-BrOA) is known to block the formation of polyhydroxyalkanoic acid (PHA) in Pseudomonasfluorescens BM07 without any influence on the cell growth when grown on fructose, but it inhibits the cell growth when grown on octanoate (OA) (Lee et al., Appl. Environ. Microbiol. 67: 4963- 4974, 2001). We i…
Depolymerization of polycarbonate(PC) in supercritical methanol was studied to develop a chemical process for waste plastics recycling.Degradation experiments were carried out in a batch-type autoclave at 230—265 ℃,7.76—9.96 MPa without any catalyst.Reaction products were analyzed by infrared spectrometer(IR), size ex…
A series of approximately 50:50 mol % poly(L-lactide-co-e-caprolactone) copolymers were synthesized by bulk copolymerization of L-lactide (LL) and e-caprolactone (CL) using stannous octoate (Sn(Oct) 2 ) and diethylene glycol (DEG) as the initiating system. The resulting P(LL-co-CL) copolymers were characterized by var…
The initial transient solute redistribution during directional solidification is systematically investigated by carefully comparing the current theoreltical models with experimental results. It is shown that at the transient front solute redistribution generally meets an exponential profile no matter whether there exi…