Materials Literature
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Single crystals of α‐Si 3 N 4 were annealed at 2000°–2150°C. The β phase was detected after annealing at 2150°C only when the crystals were surrounded by MgO·3Al 2 O 3 or Y 2 O 3 powders. On the other hand, no evidence of the α–β transformation was found when the crystals were annealed without additives. The solution–…
Lars Thorbjørn Jensen, Nis Baun Høst; Collagen: scaffold for repair or execution, Cardiovascular Research, Volume 33, Issue 3, 1 March 1997, Pages 535–539, http
Abstract This paper deals with a novel polyelectrolyte complex (PEC) of two natural polyelectrolyte ligands, i.e. chitosan (CS) and pectin (PTn). The composition and its effect on the swelling properties of this CS‐PTn PEC were studied. The results reveal that the swelling of the polyelectrolyte complex is connected w…
An isothiocyanate form of a lanthanide chelate which is highly luminescent when bound to terbium or europium has been synthesized. The chelate consists of diethylenetriaminepentaacetic acid (DTPA) covalently joined to a chromophore, 7-amino-4-methyl-2(1H)-quinolinone (cs124), and to L-p-aminophenylalanine, in which th…
Cu-ZSM-5 samples with various Cu(+)/Cu(2+) ratios have been successfully prepared in three different methods and studied by XPS and FTIR. Cu(+) ions are found, by XPS, to mainly exist in the samples prepared by solution ion exchange and microwave solid-state reaction exchange. On the basis of the chemical shift of the…
The Peierls stress is the stress required to move a dislocation through a perfect crystal lattice. Theoretical estimates show an exponential dependence on the ratio of the spacing between gliding planes and the unit slip distance. Nabarro corrected an error of a factor of 2 in this exponent in Peierls's original estim…
Magnetic and magnetoresistance measurements were carried out on a distorted perovskite, ${\mathrm{Eu}}_{0.58}$${\mathrm{Sr}}_{0.42}$${\mathrm{MnO}}_{3}$. In the absence of applied magnetic field, this compound is an insulator down to 5 K. Results of the ac- and dc-susceptibility measurements suggest a spin-glass groun…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTOxygen Surface Exchange and Diffusion in the New Perovskite Oxide Ion Conductor LaGaO3Tatsumi Ishihara, John A. Kilner, Miho Honda, and Yusaku TakitaView Author Information Department of Applied Chemistry, Faculty of Engineering Oita University, Dannoharu 700, Oita 870…
The hydrophilic/hydrophobic behavior of two silica polymorphs (a finely ground cristobalite and a pyrogenic amorphous Aerosil) was studied by means of adsorption microcalorimetry, as a function of nature and extension of the surface hydroxylated layer. Water and two alcohols (methanol and tert -butyl alcohol) were use…
Grey relational analysis makes use of relatively simple mathematical procedures to arrive at salient relationships in a complex system. It uses a relatively small amount of data and works with great variability in factors. Grey relational analysis was used to investigate the relationship between inhibitor structure an…
Minor spatial fluctuations on the pA scale in passive current density of type 304 stainless steel in dilute aqueous chloride solution are shown to relate directly to the subsequent initiation of pitting corrosion.
Confinement of a nematogen in submicrometer cavities can produce substantial effects on the nematic-isotropic phase transition and on order and orientation of the nematic phase. We combine the methods of C13- and H-NMR1 and broadband dielectric spectroscopy to probe liquid crystalline order and molecular mobility. We…
We report the observation of room-temperature and low-temperature visible photoluminescence from nanocrystalline silicon (nc-Si) thin films produced by plasma-enhanced chemical vapor deposition (PECVD) through a gas discharge containing SiH4 diluted in Ar and H2. The nanocrystalline silicon films were characterized us…
Acetyl-CoA synthetase (ADP-forming) is an enzyme in Archaea that catalyzes the formation of acetate from acetyl-CoA and couples this reaction with the synthesis of ATP from ADP and Pi (acetyl-CoA + ADP + Pi --> acetate + ATP + CoA) [Schifer, T., Selig, M. & Schonheit, P. (1993) Arch. Microbiol. 159, 72-83]. The enzyme…
The chemical changes that occurred in two copper-based catalysts (Cu-ZSM-5 and Cu-Al 2 O 3 ) during the selective reduction of NO with propene in the presence of oxygen were studied using in situ X-ray absorption near edge structure (XANES). For the quantitative analysis of the XANES spectra, a mathematical procedure…
The recently reported interesting behavior of the EPR spin intensity as freshly prepared CuZSM-5 is dehydrated has been confirmed, and the interpretation offered in explanation has been tested by extending the data. Magnetic susceptibility and optical diffuse reflection spectroscopy have been used to show that the ano…
We report on efficient frequency upconversion in ${\mathrm{Er}}^{3+}$ -doped fluoroindate glass. The process is observed under 1.48 \ensuremath{\mu}m laser diode excitation and results in fluorescence generation in the range from ultraviolet to near-infrared radiation. The study was performed for samples containing 1,…
Highly pure aluminum was anodized at a constant current density of 25 A m − 2 at 293 Kin 0.5 M boric acid/0, 0.005, or 0.05 M sodium tetraborate solutions, to examine the effect of sodium tetraborate concentration on the formation and breakdown characteristics of barrier oxide films by using inductively coupled plasma…
This article on acoustic cavitation is a revision of a tutorial lecture presented at the Acoustical Society of America meeting in Austin, Texas, on 28 November 1994. The general approach adopted here differs from a review article in stressing the overarching themes that come under the category of acoustic cavitation,…
Single crystals of Dabco−MnGS−SB1 (MnGe 4 S 10 ·(C 6 H 14 N 2 )·3H 2 O) were synthesized hydrothermally in the presence of Dabco (1,4-diazabicyclo[2.2.2]octane). This material ( Pna 2 1, a = 18.367(2), b = 14.184(2), and c = 9.410(1) Å) contains [Ge 4 S 10 ] 4 - adamantine clusters corner-linked through distorted Mn 2…