Materials Literature
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A series of syndiotactic polystyrene (SPS) samples in β-crystalline form were prepared by cooling from the melt at various rates. The effects of cooling rate from the melt, DSC heating rate and annealing on the multiple melting behaviours of β crystals were investigated by differential scanning calorimetry (DSC) and t…
Nylon-6-b-polyimide-b-nylon-6 copolymers were prepared by first synthesizing a series of imide oligomers end-capped with phenyl 4-aminobenzoate. The oligomers were then used to activate the anionic polymerization of molten ϵ-caprolactam. In the block copolymer syntheses, the phenyl ester groups reacted quickly with ca…
The results are given investigations of the structural and physicomechanical properties in porous titanium nickelide, and these results are compared with analogous properties in cast alloys.
Field induced deformation and electrocaloric effect are investigated in the vicinity of phase transition at 163°C. The sharp increase of electrostriction below Tc is explained by the field induced ferroelectric to antiferroelectric phase transition. The antiferroelectric phase appears and remains stable below Tc in th…
The temperature dependencies of optical birefringence for nominally pure crystals Sn2P2S6 and these crystals with the impurities of lead or selenium atoms, and solid solutions of Sn2P2(SexS1−x)6 have been investigated. The changes of the anomalies in the vicinity of the second order ferroelectric phase transition with…
The infrared and Raman spectra of (NH4)2HPO4 and (ND4)2DPO4 were investigated between 10 and 450 K in the 4000–10 cm−1 wavenumber range. For the two compounds, four crystalline phases were evidenced and characterized spectroscopically, and structural and dynamic information was obtained. The crystalline structures and…
Thermal conductivity (κ) of iodine doped n-type PbTe with carrier concentration (n) in the range of 1.5×1024 to 3.4×1025 m−3 was measured by using a laser flash method in the temperature range from 300 to 600 K. The scattering factor (r) was estimated from the temperature dependence of Hall mobility. The r values belo…
We study the Lyapunov exponent for electron and phonon excitations, in pure and random Fibonacci quasicrystal chains, using an exact real-space renormalization-group method, which allows the calculation of the Lyapunov exponent as a function of the energy. It is shown that the Lyapunov exponent on a pure Fibonacci cha…
The molecular characterization of the maltohexaose-producing amylase gene of Klebsiella pneumoniae revealed an open reading frame in which 2,031 base pairs encode a protein of 677 amino acids with a calculated molecular weight of 75,921. The amylase gene had high similarities of 73.6% in DNA sequence and 79.3% in dedu…
Prediction of the cure-induced Tg increases and associated matrix and composite mechanical property deterioration of BMI systems in real service environments is attempted by network structure interrelations with mechanical and thermal properties as a function of composition (initial monomer ratio) and time-temperature…
Effects of a strong magnetic field on recrystallization and coarsening of grains after primary recrystallization were studied in non-oriented 3% silicon steels. The strongest applied magnetic field strength was 10 tesla. It was found that primary recrystallization process is retarded by applying a strong magnetic fiel…
During corrosion of Zr alloys in pressurized water at high temperatures a fraction of the corrosion-hydrogen is picked up by the metal. Long-term out-of-pile corrosion experiments have shown that chemical composition of Zr alloys and the size of second-phase particles (SPP) in Zircaloy-4 (Zry-4) affect the corrosion a…
Layered composites have been proposed as advanced materials for future use in large naval sonar domes. Unlike today’s steel/rubber composite domes, such materials promise engineered acoustic properties and less costly resin-transfer fabrication methods. The development and deployment of these large and complex composi…
Abstract A current sheet separates, beyond the closed part of the pulsar magnetosphere, two half-spaces with oppositely directed magnetic fields. It is shown that reconnection in this sheet may provide a source for high-energy emission.
Soil sample collected from industrial area of Kadi and Mehshana, India. Twelve bacterial isolates were found to be the most promising PHA accumulating bacteria among 15 isolates screened from soil. Screening for PHA was done by Sudan black staining. PHA extraction was carried out by chloroform digestion method. Bioche…
Abstract. Tranparent conducting coatings have been prepared by sol gel methods either by a conventional sol-gel process (Antimony doped Tin Oxide—ATO, Aluminium doped Zinc Oxide—AZO) or a new wet chemical process using fully dispersed crystalline nanoparticles (ATO, Indium Tin Oxide—ITO). The dip coating technique has…
Journal URL: http://www.societyofglasstechnology.org.uk/cgi-bin/open.cgi?page=journal&sessionid=85597106; http://www.ingentaconnect.com/content/sgt/pcg; http://www.societyofglasstechnology.org.uk/cgi-bin/open.cgi?page=%20PC/PC-00a&sessionid=85597106
"We describe an experimental method by which site-specific valence-electronic structure may be obtained. Itutilizes the spatial dependence of the electric-field intensity that results from the superposition of the incidentand reflected x-ray beams within the vicinity of a crystal x-ray Bragg reflection. Resolution of…
Studies on shock response of circular plates subjected to underwater explosion is of interest to ship designers. Non‐contact underwater explosion experiments were carried out on air backed circular High Strength Low Alloy (HSLA) steel plates of 4 mm thickness and 290 mm diameter. The experiments were carried out in tw…
(Pro-Pro-Gly)(10) is one of the most widely studied collagen polypeptide models. Microgravity crystal growth of (Pro-Pro-Gly)(10) was carried out in the Advanced Protein Crystallization Facility aboard the Space Shuttle Discovery during the STS-95 mission. Crystals were successfully grown in all experiments, using bot…