Materials Literature
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Fatigue properties of a bearing steel (SUJ 2) including long life region were experimentally examined under axial loading and discussed from viewpoints of fractography and fracture mechanics. Thus, the complicated S-N property in the wide life region was well explained as the duplex S-N characteristics superimposed tw…
The mechanical properties of compacts of microcrystalline cellulose (MCC) and silicified microcrystalline cellulose (SMCC) were evaluated by tensile testing, diametric compression testing, and compression testing. For tensile and compression testing, cubic specimens were carefully machined from MCC and SMCC compacts,…
An experimental setup is described which allows simultaneous in situ measurements with the Kelvin probe and infrared reflection absorption spectroscopy (IRAS). Variations in the Volta potential were measured during corrosion of zinc surfaces in humid air, and information about the composition and the growth kinetics o…
In the mesoscale, mixing dynamics involving immiscible fluids is truly an outstanding problem in many fields, ranging from biology to geology, because of the multiscale nature which causes severe difficulties for conventional methods using partial differential equations. The existing macroscopic models incorporating t…
Microbial degraders of poly(3-hydroxybutyrate) (PHB) were isolated from soil. Arthrobacter sp. strain W6 used not only PHB as a carbon source, but also PHAs such as poly(3-hydroxybutyrate-co-[5%]3-hydroxyvalerate), poly(3-hydroxybutyrate-co-[14%]3-hydroxyvalerate), and poly(3-hydroxybutyrate-co-[22%]3-hydroxyvalerate)…
SUMMARIES It is suggested that the depolymerization of oxidized cellulose (e.g. paper) caused by alkalinity can be exploited to evaluate its degree of oxidation. A rough estimate can be obtained with just one sample measured before and after heating in the alkaline solvent for viscosity itself; a more accurate evaluat…
Dodecahydro-3a,9a-diazaperylene (DHDAP) was prepared in one step from p-phenylenediamine and 1-bromo-3-chloropropane, and its first redox potential is 292 mV more negative than the first redox potential of N,N,N',N'-tetramethyl-p-phenylenediamine (TMPD), thus becoming the most easily oxidized p-phenylenediamine homolo…
The fully alicyclic polyimides were prepared by a 2-step polycondensation of 2, 5(6)-bis(aminomethyl)bicyclo[2.2.1]heptane with cycloaliphatic dianhydrides such as bicyclo[2.2.1]heptane-2, 3, 5, 6-tetracarboxylic dianhydride. These polyimides possessed a 5% weight-loss temperature range of 422-459°C in N2, and 411- 41…
A description is given of a new method for examining the repassivation and pitting characteristics of freshly bared metal surfaces in situ . The method consists of guillotining a potentiostatically controlled electrode surface while it is under impact from a driven electrolyte jet. Because the fluid jet is of known an…
Polymeric surfactants are usually prepared via copolymerisation of suitably substituted monomers. In this study, polymer surfactants were made by modifying a highly functionalized polymer chain back bone: a copolymer of styrene and maleic anhydride, SMA (34wt.-% MA), was turned into anionic, cationic and nonionic surf…
Highly disordered graphitic carbon layers were formed on various types of commercially available silicon carbide (SiC) ceramics by reaction with chlorine and chlorine-hydrogen gas mixtures at 1000°C. The carbon was produced ranging from only a few micrometers to hundreds of micrometers thick. When a platinum sample ho…
A copolymer of glycidyl methacrylate and styrene (PGS) was synthesized by emulsion polymerization. The effect of the polymer on paper dry- and wet-strength improvement was investigated. The polymer contains phenyl groups that provide hydrophobic character to fibers so as to improve paper wet performance, and glycidyl…
A DNA fragment that carried the gene (proA) encoding 4-hydroxy-4-methyl-2-oxoglutarate aldolase was cloned from the chromosomal DNA of Pseudomonas ochraceae NGJ1, and the coding region was assigned to the nucleotide sequence based on the N-terminal amino acid sequence of the enzyme purified from the organism. The proA…
A full Cu damascene metallization process was successfully developed for simultaneous formation of sub-0.18 /spl mu/m RF CMOS passive components including circular spiral inductor and MIM capacitor. High quality factor inductor with Q=18 at 1.2 nH was achieved by applying highly uniform Cu CMP process on polishing mic…
Catalysts based on manganese oxide and modified with Ag (AgMn0.10) or Ba (BaMn0.10) were prepared and applied to CH4 deep oxidation. The catalysts were characterized by means of N2-BET, XRD, XPS, CH4-TPR and O2-TPD techniques. Catalytic evaluation results show that both AgMn0.10 and BaMn0.10 exhibit higher CH4 oxidati…
A new modeling method using a uniaxial medium model has been proposed to obtain a simple and quantitative expression for the transmittance of an in-plane switching (IPS) mode. In this model, the effective birefringence ( Δ n eff ) and the apparent optic axis rotation angle (φ app ) are used instead of the original bir…
Photoluminescent and triboluminescent (TrL) properties of PZT materials at room temperature were investigated for the first time in this study. Two emissions centered at 2.0eV and 3.0eV were observed, respectively, which were explained by the self-trapped behavior of the intrinsic defects. Moreover, the strong TrL was…
Fundamental deformation and deformation-recovery behaviors of Ni-Ti-Nb shape memory alloy were experimentally investigated, especially their dependency on test temperature. Monotonic tension tests and deformation-recovery tests were conducted at low and high temperatures ranging from 253 K to 473 K. Stress-strain resp…
Ruthenium(II) complexes containing the macrocycle 1,4,8,11-tetrathiacyclotetradecane ([14]aneS4) and nitrogen-coordinated nitrile ligands were prepared using cis-[Ru(DMSO)4Cl2] as the starting material. The first synthetic step consisted of introduction of the thioether ligand to give [Ru([14]aneS4)(DMSO)Cl]Cl. Substi…
The poly(propylene imine) dendrimers DAB-dendr-(NH2)8, DAB-dendr-(NH2)32, and DAB-dendr-(NH2)64 were fully converted with iodomethane to quaternary ammonium ions at both chain ends and branch points and, with less iodomethane, were partially converted to quaternary ammonium ions mainly at end groups. Amidation of the…