Materials Literature
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This paper considers the numerical solution of one-dimensional Stefan problems. The basic method used is the heat balance integral method (HBIM). The method is applied to one-phase melting/solidification problems. Both cylindrical and spherical geometries are considered and a special starting procedure is used for sma…
A diimide dicarboxylic acid, 1,4-bis(4-trimellitimidophenoxy)naphthalene (1,4-BTMPN), was prepared by condensation of 1,4-bis(4-aminophenoxy)naphthalene and trimellitic anhydride at a 1 : 2 molar ratio. A series of novel poly(amide-imide)s (IIa–k) with inherent viscosities of 0.72 to 1.59 dL/g were prepared by triphen…
The morphology build-up in toughened epoxy blends using reactive hyperbranched dendritic polymers (HBP) and amine-cured epoxy resins has been investigated in the present work. By changing the processing conditions or the surface chemistry of the modifier, very different morphologies can be obtained, ranging from homog…
This paper deals with the impact of hydrogen on plasticity and creep of unirradiated CWSR Zircaloy-4 cladding tubes. Specimens with low tin content (≈1.3%) were charged with hydrogen between 100 and 1100 ppm using gaseous technique. Uniaxial and biaxial mechanical tests (tension and creep) were conducted on as-receive…
Nitrous oxide is introduced as a rocket propellant for small satellites. The reasons for using this propellant on small spacecrafts are discussed. Potential space applications of nitrous oxide are listed. A nitrous oxide catalytic decomposition technique is suggested for restartable spacecraft propulsion. Theoretical…
The behavior of Al8B4C7 in CO(g) and its effect as an antioxidant in both Al2O3-C and MgO-C have been investigated, and the corresponding mechanisms have been discussed. Al8B4C7 markedly inhibits the oxidation of the carbon-containing refractories. The added Al8B4C7 reacts with CO(g) quickly above 1400°C to give B2O3.…
To understand the chemical basis of action for the PDR5-encoded multidrug resistance transporter of Saccharomyces cerevisiae, we compared the relative hypersensitivities of the wild-type (RW2802) and null mutant strains toward a series of tri-n-alkyltin compounds. These compounds differ from each other in a systematic…
For the prevention of a particle-initiated breakdown within gas-insulated switchgear, fundamental characteristics of particle motion were investigated. It was found that the particle motion depends not only on Coulombic force, but on the corona discharge from the tip of a particle. Thus, the corona current from a fixe…
The solubility coefficient (s) values for ethyl acetate in three heat sealant polymer membranes (LDPE, LLDPE and ionomer) were determined over a range of permeant vapour concentrations by a gravimetric procedure and an isostatic permeability technique. The respective solubility coefficient values obtained by the two m…
A study of the hybrid organic‐inorganic hexacyanoferrate‐polypyrrole material as a cathode in rechargeable lithium cells is reported as part of a series of functional hybrid materials that represent a new concept in energy storage. The effect of synthesis temperatures of the hybrid in the specific capacity obtained fr…
This work employs a two‐dimensional transient thermal model to analyze the effect of attaching cold plates into nickel/metal hydride batteries for its heat dissipation. The influences of configuration parameters and operation conditions on the thermal performance of cold plates are also explored. Among the six kinds o…
A low‐temperature process with good step coverage of silicon nitride (SiN) formed by low‐pressure chemical vapor deposition (LPCVD) has been successfully developed by using hexachlorodisilane (HCD). HCD‐SiN showed a higher deposition rate than the conventional LPCVD technique performed at temperatures above 700°C. SiN…
The shape memory effect (SME) of an Fe14Mn6Si9Cr5Ni alloy has been studied, and resulted to be the best for joining pipe. Training can improve the SME of the alloy. Fe14Mn6Si9Cr5Ni alloy shows good creep and stress relaxation resistance. Its corrosion resistance in alkaline solution is 4–5 times better than that of 30…
Pressure effect on the melting behavior of poly(butylene terephthalate) (PBT) and poly(hexamethylene terephthalate) (PHT) was studied by high-pressure DTA (HP-DTA) up to 320 and 530 MPa, respectively. Cooling rate dependence on the DSC melting curves of the samples cooled from the melt was shown at atmospheric pressur…
Maleic anhydride has been grafted onto various polyethylenes (PEs) using 2,5-dimethyl-2,5-(di-t-butylperoxy)hexane as a free radical initiator in the presence of styrene as a comonomer. Three polyethylenes, differing systematically in their levels of terminal unsaturation and branching, were selected to investigate th…
A set of blends of styrene–butadiene–styrene triblock copolymer (SBS) and isotactic polypropylene (i-PP) in a composition range 0–100 % polypropylene by weight was prepared in a twin screw extruder. The morphology of the blends has been studied by transmission electron microscopy. The blends present phase separation.…
The epoxy resin prepolymers used in producing the blend materials were CY1301 and CY1311 and both use the hardener HY1300 with the same weight ratio. Although both prepolymers have the same cure chemistry, they contain different levels of additives such as flexibilisers and tougheners. The change over in the tree grow…
Diesel engine exhaust particles were collected under controlled conditions with and without passing a Pt/Al2O3 exhaust after-treatment oxidation catalyst and were studied before and after extraction treatment. The surface compositions were analyzed by means of X-ray photoelectron spectrometry (XPS). The properties of…
Direct oxygen determination of MF–AlF3–Al2O3 (M = Li, Na, K) melts in dependence on cryolite ratio and alumina content was performed using the LECO TC-436 Nitrogen/Oxygen analyzer. On the basis of the obtained results the distribution of individual oxyfluoroaluminate species was obtained. The results have confirmed th…
The effects of phenolic additives on the gelation behavior of gelatin gels were investigated using thermomechanical analysis (TMA) for study of gel-melting temperature, dynamic mechanical analysis (DMA) for study of gel-storage modulus and gel-aging stability, viscometry for study of gelation time, and texture analyze…