Materials Literature
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A transmission electron microscope study of the structures of grain boundaries in zinc has been performed. Dislocation structures are observed in many high angle boundaries, and in most cases, the boundaries that exhibit such structure are close in misorientation to a coincidence site lattice (CSL) forming misorientat…
Abstract Electron–hole recombination luminescence is investigated in CsCdBr 3 crystals. This luminescence consists mainly of a single band at 1.9 eV, assigned to a transition 3 Σ → 1 Σ . The comparison between this emission and emission observed under the 4 eV excitation confirms that the latter is due to Br centers.
Disclinations in thin crystals of MgCd alloy are demonstrated by high resolution electron microscopy. The disclinations appear along the intersection lines of twin boundaries which occur due to spontaneous lattice deformations at the phase transition temperature. A star-disclination which is not an intersection line c…
Using high-purity starting materials, we synthesized a new room-temperature Cs2KInCl6 phase (I): monoclinic (C2/c), a = 25.484(11), b = 7.699(2) and c = 13.225(3) Å, β = 100.69(3)°. A ferroelasticparaelastic phase transition is noted at Tc = 100°C (by Thermal Analysis and X-ray, Raman-scattering, electrical permittivi…
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…