Materials Literature
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Abstract The dynamic crystallization and the melting behavior of polystyrene‐ block ‐poly(ε‐caprolactone) (PS‐ b ‐PCL, short notation SC), polybutadiene‐ block ‐poly(ε‐caprolactone) (PB‐ b ‐PCL, BC) and polystyrene‐ block ‐polybutadiene‐ block ‐poly(ε‐caprolactone) (PS‐ b ‐PB‐ b ‐PCL, SBC) have been studied using diff…
Results are presented for isothermal, high-pressure (up to p=300 MPa), and temperature (under atmospheric pressure) measurements of complex dielectric permittivity in supercooled di-isobutyl phthalate. The relaxation times determined from the temperature study obey the temperature Vogel-Fulcher-Tammann (VFT) law. The…
The covariant form of the Landau--de Gennes free energy is used to study the chevron structure formed by cooling from the Sm-A to the nonchiral Sm-C phase in a surface-stabilized cell with planar boundary conditions. We show that the chevron is the thermodynamic equilibrium structure. The chevron structure is studied…
Binding of (i) purified wild-type poly(3-hydroxybutyrate) (PHB) depolymerase PhaZ4 of Pseudomonas lemoignei, (ii) a purified truncated form of PhaZ4, which lacked 55 C-terminal amino acids and (iii) commercial lactate dehydrogenase to aqueous suspensions of PHB, chitin or cellulose was studied. Only the wild-type PHB…
Abstract This paper describes the preparation and properties of in‐situ composites based on polymers with no overlap in processing temperatures. The polymers used were Vectra A900, a thermotropic liquid crystalline copolyester (TLCP), and Arnitel em630, a thermoplastic elastomer. Blends were generated by feeding the t…
The nature of the interfacial bond has a major effect on the degree of toughening that can be achieved in a ductile‐particle‐reinforced ceramic‐matrix composite. The effect of variation of oxygen partial pressure during fabrication on the bonding in an alumina‐nickel composite has been investigated. Calculations sugge…
Structural and optical anisotropies have been investigated in some chalcogenide glasses exposed to illumination of linearly polarized light. X-ray diffraction patterns of illuminated ${\mathrm{As}}_{2}$${\mathrm{S}}_{3}$ manifest a structural modification at \ensuremath{\sim}1 A${\mathrm{\r{}}}^{\mathrm{\ensuremath{-}…
A variation in the structure of the decagonal phase with composition and phase transformations related to the decagonal phase have been observed in Al70Ni30-xCox alloys with x varying from 16 to 24. A decagonal phase with fundamental reflections at Al70Ni24Co6 converts to a (type I) superstructure around Al70Ni18Co12…
Abstract A series of 4-arylmethyleneamino-2,2,6,6-tetramethylpiperidin-1-yloxyls (4-arylmethyleneamino-TEMPO) and related compounds were synthesized, and their magnetic susceptibilities were measured by a SQUID magnetometer in the temperature range of 1.8—100 K. Of 165 radicals investigated, 52 kinds of radicals exhib…
Lawsonite single crystals were investigated by polarized FfIR spectroscopy at wave numbers between 8000 and 1000 cm^(-1) and temperatures between 82 and 325 K. This temperature range contains three lawsonite phases-Cmcm > 273 K, 273 K > Pmcn > 150 K, P2_1cn < 150 K-which are characterized by different rota…
A parameter space approach is used to represent the operation of all liquid crystal displays. The Jones matrix nematic is used to analyze the static optical properties of liquid crystal displays with any twist angle, cell thickness, natural birefringence, and polarizer angles. All the usual display modes such as 90° T…
The cleavage/polyadenylation factor I (CF I) is one of four factors required for mRNA 3' end formation in the yeast Saccharomyces cerevisiae. Here we describe the purification of CF I and its separation into two components, CF IA and CF IB. Both components are needed to reconstitute CF I activity in cleavage and poly(…
A low hydrogen content form of amorphous hydrogenated carbon (a-C: H) was deposited from a magnetically confined plasma, for a range of self bias voltages. The structure was characterized in terms of its density, sp3 bonding fraction, H content, and H bonding. The Tauc optical gap was found to vary from 2 to 3 eV as t…
Steady shear viscosity, dynamic viscosity, dynamic modulus, and normal force were measured via rotational rheometry for concentrated solutions of racemic mixtures of poly(benzyl-glutamate) and poly(benzyl-D-glutamate) in m-cresol. A transition from the isotropic state to liquid-crystalline order with increase in conce…
Polyimides were synthesized by polycondensation of nadic anhydride monoester (NE), hexafluoroisopropylidene-2,2-bis (phthalic acid anhydride) (6HFDA) and Cardo diamine in aprotic/polar medium. After examining the microstructure and the composition of systems with a polymerization index n̄ = 2.075 and 5.18 by high perf…
Other| October 01, 1996 Quantitative analysis of alkali feldspar minerals using Rietveld refinement of X-ray diffraction data Sang-Heon Shim; Sang-Heon Shim Seoul National University, Department of Geological Sciences, Seoul, South Korea Search for other works by this author on: GSW Google Scholar Soo Jin Kim; Soo Jin…
Permanent relief holographic gratings with variable modulation depth have been induced in porous Si films using the interference of two beams obtained by a frequency-doubled Nd:YAG laser (γ = 530 nm) and a conventional optical setup. Consequently, the gratings have been confined in the porous Si film and the diffracti…
The compounds Mn II 2 Mn III (BO 3 )O 2 (I) and Mn II SrMn III (BO 3 )O 2 (II) were prepared by using a B 2 O 3 flux technique. Single crystals were investigated by X-ray diffraction. I showed orthorhombic symmetry, space group D 9 2h - Pbam (No. 55), a = 926.0; b = 1241.5; c = 304.96pm ; Z = 4 and II monoclinic symme…
A propane-fueled research combustor has been designed to represent the essential features of primary zones of combustors for aircraft gas turbine engines in an investigation of lean blowouts. The atmospheric pressure test facility being used for the investigation made it difficult to approach the maximum heat release…
A comprehensive discussion of the resolution function in specular and diffuse X-ray reflectivity is given. This is particularly relevant due to the proliferation of this technique in the field of liquid and solid surfaces and multilayer systems. A simple quantitatively correct interpretation of the diffuse reflectivit…