Materials Literature
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The simulation of axisymmetric drop impact onto a solid surface is now commonplace, but precise agreement between simulation and experiment is elusive, particularly when capillary effects are important. The reason is related to the complex relationship between the contact angle and the contact line velocity. In fact,…
The redox process undergone by the electrochemically synthesized poly( -dithiodianiline), poly(DTDA), has been examined in acetonitrile-water mixtures by electrochemical and spectroscopic techniques. The spectroscopic properties of this material are equivalent to those exhibited by the chemically synthesized one. The…
The shape memory effect (SME) induced by the magnetic field is interesting and important for physics and application. The ferromagnetic Ni2MnGa films with various compositions were deposited on a poly-vinyl alcohol (PVA) substrate with a radio-frequency (RF) magnetron sputtering apparatus using four kinds of Ni–Mn–Ga…
Abstract Simple thermolysis routes to CdS, ZnS, and CoP nanorods have been developed in our laboratory. The structural properties of the nanorods obtained were elucidated by means of X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HR-TEM). Arguments and calculations in support of the cont…
This work is a brief review of physicochemical properties of modern cathode materials for Li-ion bat-teries. These intercalated transition metal compounds of layered, spinel or olivine-type structure exhibit a correlation between their microscopic electronic properties and the efficiency and mechanism of lithium inter…
The effect of composition and hot rolling conditions on the shape memory effect (SME) in the Fe–Mn–Si-based system has been studied to obtain improved shape memory without the need to rely on “training”. It has been found that the texture is not markedly affected by rolling conditions, and texture is therefore not a m…
A series of polyamide-6 (PA6)/layered silicate (clay) nanocomposites were prepared via direct melt compounding using a conventional single screw extruder, and then the effect of interfacial interaction on the characteristic internal structure and rheological properties of PA6/clay nanocomposites was investigated. XRD…
The Metal Hydride Intermediate-Buffer (MIB) method has been proposed as a measure to enable flexible load following operation and immediate start-up of PEFC system with a reformer. In this method, using the property of metal hydride to absorb hydrogen selectively, hydrogen is stored and purified simultaneously from re…
Using the Gauss-Seidel projection method developed in [4] and[17], we simulate the three dimensional domain wall structures forthin films at various thickness. We observe transition from Néelwall to cross-tie wall and to Bloch wall as the thickness isincreased. Periodic structures for cross-tie wall are also studied.T…
Thermoelectric generation technology that can convert thermal energy directly into electrical power has attracted a great deal of public attention as a system of waste heat recovery. To utilize waste heat in the 500-600 degC range effectively, it is necessary to develop a thermoelectric generation module which offers…
The anodic porous alumina with a cell size of 25 to 40 nm was prepared by applying a voltage of 20 V for 90 s in 20 wt % sulfuric acid at 15°C. The nickel catalyst for the growth of carbon nanotubes (CNTs) was cathodically deposited at the bottom of the porous alumina at a constant current density of 10 mA/cm 2 . High…
Inorganic-organic hybrid films with a maximum thickness of about 40 μm were prepared from vinyltriethoxysilane (VTES) through a sol-gel process. UV light from a high-pressure mercury lamp was irradiated through a photomask on the hybrid films from VTES. IR and 29Si NMR spectra of the coating films showed that C=C bond…
The average and local structures in the (Ti0.45Cr0.35Mo0.20)–D system have been investigated by neutron powder diffraction and total neutron scattering. From the result of neutron powder diffraction, the crystal structure of the system was found to change from CaF2-type structure to bcc structure in the hydrogen desor…
Gas-pressure sintering of β- and α-silicon nitride powders has been investigated at 1800-2000°C under 980 kPa N2. The sintering behavior was detected by a dilatometer. Liquid phase sintering and grain growth of β powder is based on diffusion-controlled kinetics. The unimodal microstructure indicates a normal grain gro…
To improve a void drift model incorporated in a subchannel analysis code, experimental data have been obtained for vertical air-water two-phase flows in several test channels of two- and multi-subchannel systems. In order to know the effects of the lattice of fuel rods on the void drift, the channels made up of two su…
Coffee foaming fractions (total and its sub-fractions: proteins/melanoidins fraction and polysaccharides fraction) were extracted from defatted and raw commercial roasted ground coffee. All the extracted fractions were analyzed using an interfacial rheometer CIR 100 (FTA) operating in time sweep mode, in order to stud…
Left handed (LH) ferrite circulators composed of the nonreciprocal LH microstrip lines using perpendicularly magnetized ferrite substrate and operating at the negative permeability frequency are studied. Following three types of circulators are proposed: a disk shaped circulator having broadband characteristics and hi…
The thermal quenching of 3.0-eV photoluminescence (PL) in oxygen-deficient α-Al 2 O 3 single crystals upon preliminary UV irradiation has been studied. It is established that the parameters of the PL quenching kinetics vary within broad limits depending on the duration of UV pretreatment. The compensation effect relat…
The NIR-FT Raman, FT-IR spectral analysis of potential NLO material P-Amino Acetanilide is carried out by density functional computations. The optimized geometry shows that NH2 and NHCOCH3 groups substituted in para position of phenyl ring are non-planar which predicts maximum conjugation of molecule with donor and ac…
OFHC Cu samples were subjected to shock loading using plane wave HE lenses to produce a uniaxial Taylor wave profile (shock followed by immediate release). Upon arrival of the shock wave at the free surface of the sample, the wave is reflected and propagates back into the sample as a release wave. It is the interactio…