Materials Literature
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Abstract A prerequisite for the protection of metallic materials against atmospheric corrosion is to prevent the deposition of water on the metal surface. If present in sufficient concentration, amphiphilic corrosion inhibitors are adsorbed on metallic surfaces as closely packed hydrophobic films which form a barrier…
Reduction of 4,4,9,9-tetramethyl-5,8-diazadodecane-2,11-dione yields the meso and racemo isomers of 4,4,9,9-tetramethyl-5,8-diazadodecane- 2,11-diol which form trinuclear compounds [Cu3( amat )2](ClO4)2 with all ligand alcohol groups deprotonated . The structure of the compound of the racemo amino alcohol has been det…
Experiments have characterized the operation of a LaB6 triode gun in a standard three-lens column of the type used for Gaussian electron-beam lithography and scanning electron microscopy. A series of images representing cross sections of the three-dimensional spatial distribution of current emitted from the gun is obt…
Abstract Mixtures of novolac resin with pressed cottonseed in different proportions after their curing as small cylinders, and also pressed cottonseed as powder were pyrolyzed until 1000°C. Some samples follow, as well as an activation process by steam between 700 and 950°C. The weight losses of the samples are much h…
In this work experimental results in infrared absorption at low temperatures on the layered compounds of the MPX3 (M=Fe,Ni and X=S,Se) family are reported. The absorption spectra in the far infrared (between 50 and 500 cm−1) recorded on thin slabs of these compounds (10 μm thick) are compared with the corresponding Ra…
Abstract Cross‐linked networks of poly(dimethylsiloxane) were swelled with styrene containing benzoyl peroxide. Polymerization of the styrene in situ, by increasing the temperature, gave novel elastomeric composites. Scanning electron micrographs suggest that low concentrations of styrene (∼ 14 wt.%) gave primarily lo…
Fission products and other compounds released during severe nuclear power plant accidents will form aerosol particles, which include water-soluble compounds such as cesium hydroxide (CsOH), cesium carbonate, and cesium iodide. These hygroscopic particles will grow in a humid environment, and thus their settling rate i…
The thermal diffusion of hydrogen in a Zr–2.5 wt % Nb pressure tube alloy has been studied in the H range from 28 to 108 ppm as a function of specimen orientation. The heat of transport Q*, lay between 4.1 and 5.1 kcal/mol, and no effect of either H concentration or specimen orientation was detected in the range studi…
A numerical procedure is presented by which the coarsening of secondary dendrite arms, during steady state solidification can be simulated. The numerical results are compared with experimental data obtained for binary Al-Cu alloys. Very good agreement of the measurements with the theoretical predictions is obtained fo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTActivation of a metal axial ligand bond in aluminum porphyrin by visible lightYasuhiro. Hirai, Hideki. Murayama, Takuzo. Aida, and Shohei. InoueCite this: J. Am. Chem. Soc. 1988, 110, 22, 7387–7390Publication Date (Print):October 1, 1988Publication History Published online1…
Single-phase fcc-structure metastable Cu1−xCrx alloys have been grown with Cr concentrations of up to 23 at. %. The films, which were typically 1.5–3 μm thick, were deposited by rf co-sputter deposition onto glass and oxidized-Si substrates at temperature between 55 and 180 °C. The average grain size of alloys grown a…
Two spectroscopically distinct types of tyrosine (Tyr) residues in triply point mutated bacteriophage T4 lysozyme, which contains no tryptophan (Trp), have been detected by optical detection of triplet-state magnetic resonance (ODMR) spectroscopy. Their triplet states are characterized by similar E but different D val…
The effects of isoelectronic doping of GaAs by In or Sb on the electron deep levels in n-GaAs grown by molecular-beam epitaxy have been investigated in the growth temperature range 500–600 °C for Si doping levels of 4–7×1016 cm−3 and As-stabilized conditions. The two dominant traps M3 and M6 are drastically reduced in…
The periplasmic nonspecific acid phosphatase II from Salmonella typhimurium was purified to homogeneity from a mutant strain that overproduces the enzyme (Uerkvitz, W., and Beck, C.F. (1981) J. Biol. Chem. 256, 382-389). It was shown that the enzyme transfers phosphate groups from organic phosphoric acid esters (donor…
An expression plasmid containing a hybrid gene encoding a protein having the primary amino acid sequence of the adenylate cyclase from Escherichia coli was constructed. When the gene was induced, the adenylate cyclase could be expressed at high levels in a cya- strain of E. coli. The majority of the enzymatic activity…
As a part of a study to develop a stainless steel (SS) with superior resistance to intergranular stress corrosion cracking (IGSCC), intergranular corrosion (IGC), and pitting corrosion, an investigation was initiated to identify possible ways to improve the properties of an 18Cr-8Ni SS. This paper discusses the influe…
The composition of NOx generated in the dissolution of UO2 has been described in different ways by earlier authors. Finding a way to determine the NOx composition in the dissolution included experiments concerning the reactions of NO and NO2 with 3 to 6 M HNO3. The following conclusions have been obtained for the diss…
A colloidal dispersion consisting of optically matched host particles and a small amount of strongly scattering tracer particles has been studied with dynamic light scattering. Analysis of the self-dynamic structure factor ${F}_{s}$(q,t) obtained from these measurements demonstrates that the displacement statistics of…
Abstract It is shown how the morphology and the bulk physico‐mechanical properties of polymer blends and alloys may be tailored, by using proper physical and processing conditions for homogeneous systems, and molecular engineering of the interfaces for heterophase ones. That approach, which has been substantiated by a…
Abstract Electron probe micro‐analysis is applied to the determination of thin films (20–200 nm) deposited on a known substrate. Bulk standards are used for calibration and data reduction is based on the computation of Φ( pz ) depth distribution functions. The Φ( pz ) model of Pouchou and Pichoir and the Gaussian Φ( p…