Materials Literature
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The soft temper plates of the AA5083 alloy are widely used in the transportation industry, for example in the construction of land transportation vehicles such as tanker lorries. Currently the use of this alloy is limited to those applications where the service temperature is less than 65°C. This limitation originates…
The thermotropic mesomorphism of some cellulose derivatives (CD) based on the (2-hydroxypropyl)cellulose (HPC) was investigated. Three types of derivatives: two esters (PPC, HxPC) and cyanoethyl derivative (CEPC) were prepared. The X-ray diffraction patterns of CDs were compared with the differential scanning calorime…
We examined the effect of melt overheating on primary solidification in aluminum alloys of various systems. The alloys were poured from the temperature of overheating, and no special treatment of the melt was performed. We assessed the sizes of equiaxed and columnar grains or primary crystals and the size of dendritic…
The sequential polytripeptides and polydipeptides, (X-Tyr-Lys)n, (XGly, Ala, Pro, Ser, Leu, Ile, Phe), (Y-Lys)n, (YGly, Tyr), and (Gly-Tyr)n, which imitate a mussel adhesive protein, have been synthesized. The molecular weights of the polypeptides were estimated to be 7,200 ∼ 13,400 (19 ∼ 42 repeating units), and th…
For most collagens, the melting temperature (T(m)) of the triple-helical structure of collagen correlates with the total content of proline (Pro) and 4-trans-hydroxyproline (Hyp) in the Xaa and Yaa positions of the -Gly-Xaa-Yaa- triplet repeat. The cuticle collagen of the deep-sea hydrothermal vent worm Riftia pachypt…
The effect of the multiple recycling of nylon-6 by injection molding on its physical–mechanical properties and morphology was studied after each cycle of injection. These studies were made in order to know how many times it is possible to recycle the nylon-6 without significant loss of the physical–mechanical properti…
The results on the lattice instability, invoked by applying a negative pressure on pure C60 solid, are described. The results of such a calculation are used to correlate the experimentally achieved results on the superconducting transition temperature Tc by doping C60 with alkali metals. A simple model had been used a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCyanines during the 1990s: A ReviewAmaresh Mishra, Rajani K. Behera, Pradipta K. Behera, Bijaya K. Mishra, and Gopa B. BeheraView Author Information Centre of Studies in Surface Science and Technology, Department of Chemistry, Sambalpur University, Jyoti Vihar 768 019, Oriss…
Abstract This paper presents the results an experimental study on ferroalloy-base flux-cored wire coatings. The work conducted shows that it is possible to improve the structure and properties of coatings by adding aluminum to the ferrochromium powder charge and rare-earth elements and calcium to ferroboron. This redu…
A series of studies were undertaken to determine the optimum rejuvenation heat treatment of HAYNES 230 alloy and to examine its weld repairability. To simulate service exposure, samples of plate nominally 4.75 mm (0.187 in.) thick were exposed at temperatures of 760°C (1400°F) and 871°C (1600°F) for a period of 1500 h…
Abstract Cored wires show a high potential for production of protective coatings for combined corrosion and wear applications. Iron and nickel based grooved cored wires without and with different reinforcing carbide fillers have been sprayed by arc- and high velocity combustion wire (HVCW) spraying with a Praxair Type…
Various issues associated with the design and mechanical evaluation of joints of ceramic matrix composites are discussed. The specific case of an affordable, robust ceramic joining technology (ARCJoinT) to join silicon carbide (CG-Nicalon™) fiber-reinforced-chemically vapor infiltrated (CVI) silicon carbide matrix com…
Abstract An experimental study of the spheroidization efficiency of induction plasma processes was completed. The main objective being to obtain models which could be subsequently used for the prediction of the spheroidization efficiency for various powders and plasma operating conditions. Silica, alumina, chromium ox…
This paper describes some generic solid oxide and molten carbonate hybrid fuel cell gas turbine systems and dynamic modeling tools that are being developed to simulate the performance of these and other hybrid fuel cell systems. The generic hybrid systems are presented to introduce issues and technical development cha…
BACKGROUND: Doxorubicin remains one of the few drugs with consistent single agent activity in advanced Soft Tissue Sarcomas (STS), with a demonstrated dose-response relationship. Liposomal-encapsulated Doxorubicin (LED) has been shown to be at least as active as free doxorubicin in experimental models, and phase I and…
Ultrafine cobalt particles have been reproducibly synthesized by decomposition of an organometallic precursor in the presence of a stabilizing polymer. The size of the stable monodisperse colloids thus obtained is seen to strongly depend on the nature of the polymer: around 4.2 nm diameter in polyphenylenoxide (PPO) a…
Compositionally graded (Pb, Ca)TiO3 thin films were prepared on platinum-coated silicon substrates by a monoethanolamine-modified sol–gel technique. The crystalline orientation and surface morphology of the graded films were related to the deposition sequence of the film layer. The dielectric constants, for up-graded…
X-ray reflectivity data of polymer bilayer systems have been analyzed using a Fourier method which takes into account different limits of integration in q-space. It is demonstrated that the interfacial parameters can be determined with high accuracy although the difference in the electron density (the contrast) of the…
The Raman spectra of the charge-ordered manganite Pr0.65Ca0.35MnO3 were studied as functions of temperature and excitation energy and compared to magnetic moment and electrical conductivity behaviors. Both the charge ordering ( T(co) approximately 225 K) and the antiferromagnetic transitions ( T(N) approximately 175 K…
Giant random telegraph noise (RTN) in the resistance fluctuation of a macroscopic film of perovskite-type manganese oxide La(2/3)Ca(1/3)MnO3 has been observed at various temperatures ranging from 4 to 170 K, well below the Curie temperature ( T(C) approximately 210 K). The amplitudes of the two-level fluctuations vary…