Materials Literature
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We present, here, the results of a study of photoluminescence spectra of Cr3+-doped MgAl2O4 natural spinel in a given wavenumber range between 26,300 and 12,500 cm-1. By using several excitation sources, we observed a new broadband, namely K, with a peak at 15,547 cm-1 and the transition process of luminescence lines…
Infrared spectroscopy has been used to study a series of synthetic agardite minerals. Four OH stretching bands are observed at around 3568, 3482, 3362, and 3296 cm(-1). The first band is assigned to zeolitic, non-hydrogen-bonded water. The band at 3296 cm(-1) is assigned to strongly hydrogen-bonded water with an H bon…
Fully dense nanocomposites of (Sm/sub 1-x/Gd/sub x/)/sub 2/(Co/sub 1-y/Fe/sub y/)/sub 2:17/ phase + Co/Fe were obtained by hot pressing the amorphous powders at 740/spl deg/-760/spl deg/C. Amorphous powders were made by mechanical alloying. Up to 14 kOe of Coercivity was obtained for these Cu and Zr free nanocomposite…
A Ab bs st tr ra ac ct t. . Of a great concern, the huge amount of waste rubber materials can cause environmental problems. Various methods have been proposed to solve this proplem. One of those is the biodegradation of it by microorganisms. Bacteria able to degrade and use natural rubber latex as the sole source of c…
Abstract The ferritic-austenitic duplex-steels have a very complex precipitation and transformation behaviour, which requires professional treatment. Especially the precipitation of the σ-phase causes considerable changes with regard to the mechanical as well as the corrosive properties, which are to be considered dur…
Co-Zr-B alloy ingots consisted of Co/sub 23/Zr/sub 6/ phase together with the small amounts of Co/sub 5/Zr and Co/sub 3/ZrB/sub 2/ phases. On the other hand, Co-Zr-B melt-spun ribbons consisted mostly of Co/sub 5/Zr phase and exhibited a high coercivity. Heat treatment of the Co-Zr-B melt-spun ribbons resulted in incr…
The electrooptics of a newly proposed transflective liquid crystal display (LCD) with hybrid-aligned liquid crystal texture is optimized by simulation. The transflective LCD possesses an ultralow threshold voltage of 0 V and an operating voltage of 3 V. By using the dual cell-gap technology and a symmetric optical str…
Investigations on amorphous FeCoSiB/SiO/sub 2//FeCoSiB thin-film samples with crossed anisotropies are presented in this paper. The samples consist of two magnetic layers, 40 nm thick each, where the second magnetic layer's uniaxial anisotropy is rotated by an angle of 90/spl deg/ with respect to the anisotropy of the…
Abstract Summary: We have constructed bioconjugates consisting of genetically modified cohesin/dockerin protein polymers combined with (CdSe)ZnS colloidal quantum dots. This recombinant protein contains fusions of Clostridium thermocellum cellulosomal cohesin and dockerin domains and a C‐terminal 6×‐histidine tag. The…
Magnetic and microstructural properties for Mn- and Ru-doped hexagonal barium ferrites have been investigated in terms of magnetization and scanning electron microscope (SEM) measurements. The field dependent magnetization data of BaFe/sub 12-x/Mn/sub x/O/sub 19/ (0 /spl les/ x /spl les/ 6), sintered at 1100/spl deg/C…
The main results of investigations in the fields of modern liquid crystal acoustics that originate from and continue the pioneering works of Prof. A.P. Kapustin are systematized and generalized. The following aspects of the problem are considered: acoustooptic phenomena, acoustoelectric interactions, acoustically indu…
The effects of composition, grain size and exchange coupling on the spin-reorientation temperature (T/sub SR/) for nanocrystalline (Nd-Pr)-(Fe-Co)-B alloys have been systematically studied. Although T/sub SR/ is usually considered to be an intrinsic magnetic property, it is nevertheless influenced by the microstructur…
A pilot project has been launched under the auspices of the Consultative Committee for Amount of Substance to evaluate the quantification for SiO2 on (100) and (111) Si in the thickness range 1.5–8 nm. Wafers and methodologies have been carefully prepared. Forty-five sets of measurements have been made in different la…
This paper is addressed to the discussion of the effect of the dislocation structure and the impurity contamination on the photoluminescence of Czochralski (Cz) silicon in the range of the D1 emission at 0.8 eV. Two types of dislocation systems were considered. One consists of intersecting hexagonal half loops of scre…
The effect of Nd substitution on microstructure and magnetic properties in [Nd/sub x/(YDy)/sub 0.5(1-x)/]/sub 2.2/Fe/sub 14/B ribbons melt-spun at 22 m/s has been systematically studied. As-spun ribbons with low Nd content consist of 2 : 17 and 2 : 14 : 1 phases in an amorphous matrix, while as-spun ribbons with high…
The accuracy and precision of quantitative energy-dispersive x-ray spectrometry in the environmental scanning electron microscope have been estimated using a series of copper / gold alloys of known composition. The mean values (five to six replicate experiments) had relative errors within +/- 5%, and most were within…
This article presents an approach to analyzing the peel behavior of pressure-sensitive adhesives (PSAs) using the finite element method. The rheological properties and the peel strength of four natural-rubber–based PSAs were experimentally measured to provide input for and comparison with the finite element modeling.…
Microcellular processing techniques have been applied at an experimental level to both extrusion and injection moulding plastics processing, using wood fibre as reinforcing filler. The focus of the current research is the investigations of these processes using chemical foaming agents and comparative studies of physic…
The flexural, shear and tensile modulus of high density polyethylene structural foams were measured in order to determine the effect of skin thickness on their response under load. Data for foam density between 424 and 725 kg/m 3 and skin thickness between 3 and 57% are compared with different models taken from the li…
The sintering and the crystallization of two iron‐rich glass compositions (45–75‐μm powder fractions) were studied in air and nitrogen atmospheres. The phase formation was evaluated by differential thermal analysis, while the densification, by dilatometry; the crystalline phases were identified by X‐ray diffraction an…