Materials Literature
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Effects of precipitates of C11b-type structure formed by aging on the mechanical properties of a shape memory Ti–40.5Ni–10Cu alloy, which slightly off-stoichiometric to the Ti poor side, were studied by constant-load thermal cycling tests, conventional tensile tests and transmission electron microscopy. The shape chan…
Acoustic emission(AE) source characterization was carried out to examine the mechanism of delayed fracture in high strength steels. In static load delayed fracture test, incubation time for crack initiation was observed. Crack initiates at the region of maximum triaxial-stress state. After crack initiation, cracks pro…
Abstract Corrosion behaviour of steel in acid solutions was followed in presence of cationic micells of Cetyltrimethylammonium bromide (CTABr), n‐tetradecyl‐N,N,N‐trimethylammonium bromide (TDTABr), n‐dodecyltrimethylammonium bromide (DDTABr) and n‐decyltrimethylammonium bromide (DTABr) using gasometry and potentiodyn…
Amino acids recovered after standard hydrolysis are predictive indicators of the state of preservation of silk and provide a rapid method that can be applied to extremely small sample sizes. Biochemical data from 17 Japanese silk kimono lining fabrics are compared to previously reported data on occidental silks. The c…
Mesogenic and nonmesogenic functional moieties were attached as pendant groups to the cubane core for an investigation of the glass-forming ability and morphological stability of the hybrid systems. Nematogens and carbazole were found to yield hybrid systems that are nematic and isotropic, respectively, all capable of…
This study used acetaminophen as a model drug and investigated the effect of soluble excipients and super disintegrants on the dissolution difference between acidic and neutral media. Tablets with various formulas were prepared and their disintegration and dissolution in both acidic and neutral media were studied. A f…
We have prepared nanoscopic gold rods of various radii and aspect ratios via anodic aluminum oxide - based template synthesis, and incorporated these particles into polyethylene films. The resulting composite films exhibit linear dichroic properties which result from a net orientation of the rods. The plasmon resonanc…
A study was conducted to determine the effects of long-term isothermal thermo-oxidative aging on the compressive properties of T-650-35 fabric reinforced PMR-15 composites. The temperatures that were studied were 204, 260, 288, 316, and 343°C. Specimens of different geometries were evaluated. Cut edge-to-surface ratio…
The reaction chemistry involved in the dissolution of polycrystalline alumina in a lime-alumina-silica slag was studied at temperatures between 1400 and 1550°C, and the phases formed at different stages of the dissolution process were characterised by X-ray powder diffraction and scanning electron microscopy. At the i…
Effects of fixing by shrink fitting on magnetic properties of iron coros are investigated to simulate magnetic behaviors of iron cores fixed in motor flames. Shrink fittings, of course, decrease their permeabilities and increase effective magnetostrictions and magnetic losses. It is well known that the magnetostrictio…
A compact of spherical silica with alkali metal oxide addition was fired within a temperature range from 600 to 1200°C for 6h in air. The crystallization and phase transformation behavior of sintered spherical silica were examined by XRD, IR, DTA, density and shrinkage measurements and SEM. The following results were…
A novel synthesis of zeolite W (MER phase) was carried out combining the use of an organocation ‘template’ molecule and zeolite K-Y as the aluminium source. The reaction was carried out at lower than usual OH– /SiO2 reactant ratios and that translated into an exceptionally high SiO2 /Al2O3 ratio (SAR) of 7.7. This nov…
PURPOSE: To compare the contrast effects of gadodiamide injection at 0.3 and at 1.5 T, at different concentrations in phantoms, and to correlate the results to clinical doses used for examining brain lesions. MATERIAL AND METHODS: Gel phantoms with T1 and T2 corresponding to brain gray matter were doped with different…
An investigation has been carried out on the effect of plastic strains on the magnetic properties of grain-oriented and nonoriented 3% by weight SiFe alloys. A drastic degradation of these properties with increasing deformations is observed for magnetic field amplitudes ranging between 0 and 2000 A/m. Empirical relati…
An automated apparatus to determine the steady-state and transient water vapor permeation behavior of fabrics and semipermeable laminates is described. Typical test results for representative types of fabrics and semipermeable membrane laminates are shown, as well as correlations between this test and two other water…
Polymeric drug-delivery systems are attractive as a means of effectively controlling drug concentration and for targeting specific regions in the body. Until recently, most polymers investigated for drug-delivery applications were either linear (nonbranched) or crosslinked (highly branched) in nature. Current advances…
Many types of materials are used in manufacturing industry today. Some of the more important ones are metals, alloys, and plastics. Different kinds of metals and alloys are used for different purposes and the diagram in Fig 6.1 shows some metals and alloys that are in common use.
Thc SPS (Spark Plasma Sintering) proccss is a new matcrials symttjesos proccssing technology recentlydcvclopcd by Sumitomo Coal Mining Co., Ltd., Japan. This paper describes the principles and fcaturcsof the SPS process, inluding the basic configuration of the Sumitom's SPS systcm, as well as the SPSproccss applicatio…
The viscosities of the four series of mixed alkali glass melts such as 25(Na2O+K2O)⋅75SiO2, 25(Na2O+K2O)⋅5Al2O3⋅70SiO2, 25(Na2O+K2O)⋅7.5Al2O3⋅67.5SiO2 and 25(Na2O+K2O)⋅10Al2O3⋅65SiO2 as well as their Tg were measured to elucidate a relation between property behaviors and mixed alkali effect models. The base mixed alka…
The chain scission rate constant and the initiator decomposition efficiency are very important kinetic parameters in the chemically initiated degradation of polypropylene. These two kinetic parameters have been estimated using both deterministic and stochastic modelling procedures. To relate the chain scission rate co…