Materials Literature
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The nonlinear regimes of anticonvection and Rayleigh–Benard convection in a two-layer system with periodic boundary conditions on lateral walls in the presence of the interfacial heat release are studied. The region where anticonvective and the Rayleigh–Benard instability mechanisms act simultaneously is considered. T…
The electronic structures of the half-Heusler isostructural compounds TiPtSn, ZrPtSn and HfPtSn were calculated and measured applying the X-ray photoemission spectroscopy.The (Ti, Zr, Hf)PtSn compounds have gaps between the occupied valence band and the empty conduction band, calculated as about 0.75, 1.12, and 1.09 e…
Some phthalocyanines soluble in organic solvents have been developed by peripheral introduction of substituent groups. We report a new method for preparation of the polyphenyl-substituted dicyanopyrazines based on the [2 + 4] Diels-Alder cycloaddition of the tetraphenylcyclopentadienone to an ethynyl compound. The syn…
The acceptance of extruded high voltage (HV) and extra high voltage cables (EHV) has increased significantly in the industry over the last 15 years. The first EHV cables in Berlin and Copenhagen were very carefully monitored and reported on in the press, but nowadays projects like this are only followed up by the expe…
This paper investigates the additional iron loss generated in the laminated silicon sheets of the core or the magnetic shields of large power transformers due to the leakage flux. A verification model is well established, and an efficient analysis method is implemented and validated. Both the magnetic and electric ani…
Nuclear magnetic resonance was critical to the development of gel dosimetry, as it established the potential for three dimensional dosimetry with chemical dosimeter systems through magnetic resonance imaging [1]. In the last two decades MRI has served as the gold standard for imaging, while NMR relaxometry has played…
A series of fibrous composites, carbon- and glass-reinforced plastics based on heat-resistant polyimide binders, were prepared. The viscoelastic and strength properties of the composites obtained confirm the enhanced heat resistance of the binders.
First-principles electronic structure calculations have been performed in order to investigate the effect of hydrogen on the stability of Ni vacancy after hydrogen desorption in LaNi 5 . Our calculated binding energy of hydrogen to the Ni vacancy indicates that up to two H atoms are trapped at the Ni vacancy. The form…
Surface acoustic waves are used to study the transformation of the surface of a high-resistance (semi-insulating) gallium arsenide in situ in the course of the thermal deposition of gold in vacuum. It is demonstrated that the surface modifications that involve the formation of the Au-Ga liquid phase and solid solution…
This research deals with the study the effect of adding the silica particles andalumina particles separately with different ratio (5, 10, 15, 20, and 25 pphr) on thehardness and wear rate of natural rubber NR and styrene butadiene rubber SBR. Theresults show that the hardness increases with the increase the loading le…
A high-content starch/polypropylene (IPP) blend with acceptable biodegradation and mechanical properties has been produced. IPP/starch (90/10) blends were tested for photo-degradation under the effects of UV sunlight conditions and an artificial UV lamp for periods of time. The influence of irradiation on the degradab…
The fracture of a camshaft made of chilled cast iron, installed in a home-made Fukang car, happened only after running over a distance of 6,200 km. The fractured camshaft was received to conduct a series of failure analyses using visual inspection, SEM observation of fracture section, microstructure analysis, chemical…
High density polyethylene + carbon black composites with electrical anisotropy was studied. Electrical anisotropy was induced by uniaxial mechanical deformation and injection moulding. We show that anisotropy depends on the carbon black concentration and percentage deformation. Resistivity had the highest anisotropy r…
The ab initio FLAPW-GGA calculations of the band structure of a new layered low-temperature (T C ∼ 2.2 K) La3Ni4P4O2 superconductor are presented. The energy bands, distributions of the densities of electron states, charge states of the atomic layers, low-temperature electron specific heat, and molar Pauli paramagneti…
From analysis of the surface and interface roughness of SiO 2 films, it was found that roughness increased on both the surface and the interface only in the initial oxidation stage, where the oxide is thinner than 10 nm. However, for thicker regions, the roughness increase tends to saturate. Using an atomically flat S…
Optical and textural studies have been carried out on special class of ferroelectric liquid crystals (FLCs) known as de Vries electroclinic liquid crystals (ELCs) in conjunction with ethanol (C 2 H 5 OH). Ethanol shifts the threshold voltage to a low value of 3 V and nearly doubles the optical tilt in the ELC under st…
The electronic structure in hydrogenated amorphous carbon (a-C:H) thin films as a function of annealing temperature was investigated by photoemission spectroscopy. The photoemission results of the valence band and the C 1s core level suggested that the graphitization of a-C:H films proceeds by annealing at more than 4…
Three co-solvents (glycerol, N-propanol and isopropanol) have been investigated for increasing the solubility of N,N'-methylene-bisacrylamide (Bis) crosslinker in polymer gel dosimeter recipes. Using isopropanol, the crosslinker solubility increased from approximately from 3 to 10 % by weight, enabling the manufacture…
Surface soil (0–15 cm) and foliar samples of wheat, rice, sugarcane, and cotton crops growing in eight intensively cultivated soil series of India were collected from farmers' fields during 2004 and 2005. Analysis of soil and leaf samples indicated widespread potassium (K) deficiency in soils and crops. Potassium defi…
Kurzfassung Zyklische Beanspruchung bei konstant steigender oder variabler Temperatur führt bei metallischen Bauteilen zu einer komplexen Schädigungsentwicklung, die nur schwer mit einfachen Mitteln zu beschreiben ist. Während des Betriebes tritt in vielen Bauteilen thermomechanische Ermüdung (TMF) auf, z.B. in Kokill…