Materials Literature
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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…
Four representative pedons supporting sal in Dindori district of Madhya Pradesh were characterised and classified. Samarpura site (P1) occurring on footslope of flat topped hills was characterised by very dark greyish brown colour throughout the profile, gravelly clay texture, sub-angular blocky structure, 27 g kg−1 o…
A new monomer diacid, 1,2-dihydro-2-(4-carboxylphenyl)-4-[4-(4-carboxylphenoxy)phenyl](2H)phthalazin-1-one (3), was synthesized through the aromatic nucleophilic substitution reaction of a readily available unsymmetrical phthalazinone bisphenol-like (1) with p-chlorobenzonitrile in presence of potassium carbonate in N…
The microstructures and mechanical properties of the AZ31 Mg tubes fabricated by one-pass forward piercing tube extrusion are examined. The grain size is refined from the initial ∼75 μm grain size down to 2—3 μm. The room temperature uniaxial tensile elongations, measured along an axis that is 0°, 45°, or 90° with res…
Aluminum alloy die-cast plates (ADC 12) were subjected to ultrasonic measurement to obtain a relation between the intensity distribution of the ultrasonic wave and positions of cold flakes appearing in the plate for developing a nondestructive method to detect cold flakes in the die-casts. Die-cast plates of 170 mm in…
The impact of 30 kHz frequency ultrasound waves on man-made cellulose fibres after a thirty-minute treatment in an aqueous medium at room temperature, was investigated. The impact of ultrasound treatment on the fibrillation tendency of viscose and lyocell fibres was determined using a modified and developed microscopi…
SUMMARIES Kinetics of acid hydrolysis of cellulose described by the Ekenstam equation was studied using some samples of ligninfree paper. The dependence of rate constant vs. RH has been determined at 90°C. The resulting plot was quite similar to those obtained by Zou and used by him to elaborate the model of cellulose…
In a Pb(Mg 1/3 Nb 2/3 )O 3 ‐35 mol% PbTiO 3 (PMN‐35PT) specimen with 5 mol% excess PbO, the pores trapped inside grains by heat treatment in a double cycle at 1150°3C have revealed the coarsening pattern of the grains. Using this technique, the coarsening process of abnormal large grains with typical characteristics o…