Materials Literature
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In a 15‐mol%‐CaO‐stabilized zirconia (CSZ) specimen, the grain boundaries at the surface region exhibited a lower electrical resistance than those at the inner region. However, when up to 1.5 mol% Al 2 O 3 was added, the grain boundaries at the surface showed a higher resistance. These results were explained in terms…
This paper describes the re sults of a st udy of a bl ack coating produced on aluminium AA2219 alloy using a process that involves creation of a hard ceramic oxide layer on the surface of the alloy by plasma electrolytic oxidation (PEO) known as the ‘KERONITE “ ’ process. Coating microstructure has been examined and t…
Air-jet textured, textured-twisted and textured-pli ed yarns have been made from apparel -grade polyester flat yarns and compared with commercial cotton a nd spun polyeste r sewing threads for prope rti es a nd seam efficiency. The uniformity characteri stics of air-jet textured sewin g threads are far superior to tho…
A direct expression system for the solubilized catalytic domains of NADPH-cytochrome P-450 reductase (sCPR) from rat (RsCPR) and porcine (PsCPR) in Escherichia coli cells was constructed using the expression plasmid pCWori(+). PsCPR was minimally expressed, whereas RsCPR was highly expressed. Replacement of the nucleo…
We investigated the correlation between surface conductivity and surface band profiles of hydrogenated single crystal diamond (type IIa and IIb) by a combination of total photoelectron yield spectroscopy and I–V measurements. Electron and exciton contributions in the photoyield spectra are clearly separated and their…
A new method of applying a dynamic load directly to a tensile specimen was developed. By combining the new method with the testing method based on a sensing block [1-5], we improved the testing method to obtain the entire tensile stress-strain curves for a wide range of strain rates on the order of 10 -3 ∼10 3 s -1 ,…
Abstract A series of cellulose‐phenol‐formaldehyde (LCPF) and cellulose‐urea‐formaldehyde (CUF) resins were produced using banana waste. Detailed structure and quantitative information was provided by FT‐IR and mass spectroscopy. The main interests were the ability to use banana waste as a source of cellulose in the c…
We synthesized the block copolymer of poly(norbornene-dicarboxcylic acid) and poly(norbornene) at room temperature, using ring opening metathesis polymerization. We then templated the CoFe/sub 2/O/sub 4/ nanoparticles within the polymer matrix, utilizing the self-assembled nature of the block copolymer. We used transm…
Complex impedance analysis at cryogenic temperatures has revealed that the bulk and grain boundary properties of BaTiO 3 polycrystals are very sensitive to the oxygen partial pressure during sintering. Polycrystals sintered at P O2 as low as 10 −15 atm were already electrically heterogeneous. The activation energy of…
Abstract The degree of molecular alignment averaged over meso‐length scale areas within thermotropic liquid crystalline polymer (LCP) fibers has been intensely studied over recent years. In this work, the degree of molecular orientation is found from spatially‐resolved electron diffraction of areas as small as 100 nm…
A stress and temperature sensor based on changes in the higher order harmonics of a magnetically soft magnetoelastic sensor is reported. When excited by a low-frequency ac magnetic field, the nonlinear permeability of the ferromagnetic sensor causes the emission of higher order magnetic induction that can be detected…
Thin rhenium buffer layers deposited on c-sapphire surfaces were studied as potential substrates for the heteroepitaxial deposition of (111)-oriented diamond films. The Re layers were prepared by e-beam evaporation. They formed very flat epitaxial films with mosaicity values below 0.2°. Application of the bias enhance…
To determine the optimum drafting conditions of twin spun yam spinning, the drafting force must be investigated. In this work, we conduct a drafting force experiment based on Lyocell twin roving of to investigate the influence of the roller gauge, draft ratio, and roving spacing. The experimental results show that the…
We have investigated sensation responses to fabric frictional sounds according to fiber type, subject's nationality, age, gender, and acoustic sensitivity. Twenty-six American and thirty- two Korean adults participated in this study, and answered questions on seventeen adjectives describing sensations upon hearing the…
The evolution of nanoscale science and technology has dramatically expanded the classes of materials being explored and even implemented in device applications. This article summarizes advancements in making low dimensional structures from inorganic and organic compounds, determining the resulting, and necessarily loc…
Abstract The spreading of polymer nanodroplets upon a sudden change from partial to complete wetting on an ideally flat and structureless solid substrate has been studied by molecular dynamic simulations using a coarse‐grained bead‐spring model of flexible macromolecules. Tanner's law for the growth of the lateral dro…
The phases and magnetic properties of Co-Zr melt-spun ribbons were studied to investigate the origin of the hard magnetic phase in Co-Zr system alloys. The Co-Zr melt-spun ribbons with coercivities of 1.5-2.7 kOe consisted of a metastable Co/sub 5/Zr phase together with fcc-Co and Co/sub 23/Zr/sub 6/ phases. Annealing…
Abstract Estolides are a group of FA polyesters resulting from ester bond formation between a hydroxyl or olefinic group of one FA and the terminal carboxyl group of a second FA. These products are commonly found in trace amounts, forming tetraglycerides in several oil seed plants, and have been produced by acid clay…
The electronic properties of hydrogen and oxygen terminated surfaces of polycrystalline diamond films are investigated in the dark and under illumination by temperature dependent surface conductivity, field dependence of photocurrent and spectrally resolved photoelectron yield measurements. The as grown characteristic…
Helium desorption from Fe-based model alloys irradiated by energetic helium ions was measured during post-irradiation annealing to investigate the energetics and kinetics of formation and annihilation of helium-related defects. Desorption temperatures were observed to be widely ranged from 450 to 1500 K, indicating th…