Materials Literature
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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…
Cerium oxide films formed by electron-beam evaporation onto oblique substrates are shown to scatter light strongly into spatially anisotropic distributions and to exhibit large normal-incidence birefringence Δ n = n(s) - n(p). The apparatus for direct recording of a useful projection of the scatter distributions is de…
The effective medium theory of one-dimensional and two-dimensional periodic structures are investigated. A method based on a Fourier decomposition of the wave propagating along the direction perpendicular to the periodic structures allows one to determine the zeroth-, first- and second-order effective indices. For one…
The slow tensile straining of smooth specimens of mill annealed Ti6Al4V with different hydrogen contents revealed hydrogen induced slow strain rate embrittlement when the hydrogen content exceeded about 2000 ppm. The effect of hydrogen on the mechanical behaviour of the Ti6Al4V at lower hydrogen levels was not so pron…
Magnesium products provide an excellent strength-to-weight ratio, good fatigue strength, high impact strength, good corrosion resistance, high-speed machinability, and good thermal and electrical conductivities. As a result, applications are expanding in almost every industry. Dozens of automotive components are now m…
Over the last decade, the focus of titanium alloy development has shifted from aerospace to industrial applications. The titanium industry has been very dependent on the aerospace market, and this sector will constitute a significant percentage of total consumption for years to come. However, titanium is increasingly…
Nature usually combines polymers with short degradation times with polymers having long degradation times in an energy and material optimized process involving hierarchical systems. Sometimes a natural system of polymers has evolved to degrade in a month, sometimes in many years. The building blocks of the plant and a…
Abstract The structure, morphology and organisation of the cusps of the major lateral radula teeth of the chiton Plaxiphora albida have been examined using light, transmission and scanning electron microscopy, together with energy dispersive X‐ray analysis and Mössbauer spectroscopy. In this chiton species, both the a…
The electrical resistivity of TiB2 has been measured using a DIA-6 cubic anvil apparatus at pressures up to 8 GPa and temperatures up to 800 K. The ambient-condition resistivity is determined to be 13.3 (±0.9) μΩ cm. The resistivity decreases with increasing pressure. At pressures above 2 GPa, the pressure dependence…
Sodium‐rich NASOCON‐type ceramics, the NaM 2 (PO 4 ) 3 + y Na 2 O (M = Ge, Ti, Hf, Zr) system, were investigated in order to obtain a material having a high Na + conductivity and high density. The ionic conductivity and the sinterability were greately improved by an increase in the valve of y for all of the system exa…
The application of chelation chemistry to the etching or removal of iron and iron oxide is investigated. Reactions of iron and iron oxide with 1,1,1,5,5,5‐hexafluoro‐2,4‐pentanedione , 1,1,1‐trifluoro acetic acid , and trimethylsilyl‐1,1,1,5,5,5‐hexafluoro‐2,4‐pentanedione (SEE + hfac) provide insight into the mechani…
Abstract A new process to synthesize thermally stable mesoporous molecular sieves of MCM‐41 structure based on delayed neutralization at ambient temperature was investigated. All samples synthesized by this new method have BET surface areas of about 1100m 2 /g and possess high thermal stability up to 900°C. Higher cry…
Abstract Phosphonate‐scale inhibitors are commonly used to prevent scale formation in many industrial processes involving high‐salinity brine solutions. To effectively prevent scale formation in these industrial processes, one must have a fundamental understanding of how phosphonates are released into high‐salinity br…
<div class="htmlview paragraph">The effect of a number of lubricity additives on the performance and no-harm characteristics of low sulfur diesel fuel has been studied. The effectiveness of conventional versus novel products is discussed and the suitability of current bench test procedures reviewed.</div>…