Materials Literature
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Article Crystal structure of pentastrontium tris(phosphate) bromide, Sr5(PO4)3Br and of pentabarium tris(phosphate) bromide Ba5(PO4)3Br, two bromoapatites was published on March 1, 2000 in the journal Zeitschrift für Kristallographie - New Crystal Structures (volume 215, issue 3).
Abstract Aging modifiers help to regulate the isobutane/air interchange in LDPE foams. In the absence of sufficient modifier, the foam will shrivel and collapse. Several glycerol esters are evaluated at four use‐levels for dimensional stability of the foam, antistatic properties, and additive “rub‐off.” Stearamide is…
The thermal-induced crystallization process of melt-quenched amorphous GeSe 2 was studied. The low-temperature (LT) form, LT-GeSe 2 and the high-temperature (HT) form, HT-GeSe 2 were observed with Raman spectroscopy, differential scanning calorimetry (DSC) and an X-ray diffractometer. We observed the X-ray diffraction…
Abstract— Ions were dissolved into the liquid‐crystal (LC) materials from peripheral materials and were also generated by electric dissociation. Moreover, those ions are partly stabilized in the form of hydrated or solvated ions with polar molecules. As the ions in an LC slab of display panel deteriorate the image qua…
X-ray diffraction study of a new representative of the eudialyte family ( R = 4.5%, 2347 independent reflections) provided the establishment of a number of characteristic features of its structure associated with a high zirconium content and some other characteristics of the composition. The deficiency of Ca is compen…
Due to their low sound velocity and high porosity PZT aerogels have an exceptional low acoustic impedance. Therefore they are promising materials for impedance-matched ultrasonic transducers that can be used for ranging and sonar systems or medical imaging devices. Monolithic, nanostructured and open porous PZT aeroge…
Abstract Injection molding of the isotactic polypropylenes polymerized using metallocene and Ziegler-Natta catalysts and having the same molecular weights was performed. Rheological properties and shear-induced crystallization kinetics were measured and their comparative analysis is made. These data are fitted to the…
Alkali- and alkali-earth-metal salts of dicyclopentadiene dicarboxylic acid (DCPDCA) were prepared and employed as crosslinkers for chlorine-containing polymers such as polychloromethylstyrene (PCMS), chlorinated polypropylene (CPP), polyepichlorohydrin (PECH), and poly(vinyl chloride) (PVC). Thermally reversible cova…
Polar structures with pseudosymmetry related to a hypothetical non-polar configuration are considered as good candidates for displacive ferroelectrics. Recently we have developed a procedure for the systematic search of pseudosymmetric structures in the available databases. The aim of the present contribution is the g…
Abstract Poly(5-aminonaphthalene-2-sulfonic acid) 2 can be prepared by oxidative polymerisation of 5- or 8-aminonapthalene-2-sulfonic acid (1a, 1b) with Na2S2O8 or KIO4. This polymer is water soluble, electrically conducting and fluorescent.
A swinging pendulum is arranged to impact and bounce from a fabric sample. The energy losses during impact compression are calculated from the changes in potential energy of the pendulum after allowing for other losses. It is found that the compression energy loss, calculated from the static characteristics, gives onl…
Parallel and perpendicular components of the dielectric constant for 5CB nematic liquid crystal are measured in a relaxation region. Two frequencies f 1 ≈30 and f 2 ≈350 MHz are determined at which the inversion of the dielectric anisotropy sign is observed. It is shown that the observed sizable high-frequency shift o…
We have studied absorption and emission spectra of the ${4f}^{14}\ensuremath{\leftrightarrow}{4f}^{13}5d$ electronic transitions of ${\mathrm{Yb}}^{2+}:({\mathrm{CN}}^{\ensuremath{-}}{)}_{n}$ defect complexes in NaCl, KCl, RbCl, and KBr host crystals under concentration variation of both dopants ${\mathrm{Yb}}^{2+}$ a…
We have studied the electro-optical characteristics of a homogeneously aligned nematic liquid crystal (LC) with weak planar anchoring of the director at the bounding substrates. By using the in-plane switching (IPS) of the LC which is achieved by an in-plane electric field, the driving voltage was confirmed to be far…
In this paper, the Newton-Raphson method, using two-directional (anisotropic) material properties, is applied to the analysis of a three-phase transformer. A new two-dimensional (2-D) model that reflects three-dimensional manufacturing effects, such as air-gap and overlapped stacking, is proposed. These effects cannot…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
Abstract Particle shape, angularity, and surface texture are critical properties in assessing aggregate usage for asphalt concrete. Fractured and flat and/or elongated particles are used in most specifications to assure quality. The particle index and uncompacted void tests indirectly measure particle shape, angularit…
Americanae nace como un proyecto conjunto que surge dentro de la Red Europea de Información y Documentación sobre América Latina (REDIAL), y que ha afrontado la Biblioteca de la Agencia Española de Cooperación Internacional para el Desarrollo (AECID). Esta nueva biblioteca virtual hace más accesibles los libros digita…
Smectites including the iron-bearing smectites have proved difficult to measure using the techniques of Raman spectroscopy. The use of Fourier transform (FT)-Raman spectrometers using indium-gallium-arsenide detectors has enabled the spectra of a selection of high iron-bearing smectites and nontronites to be measured.…
Abstract Dynamic fatigue crack growth has been investigated in polyethylenes of various molecular weights and branch concentrations. Square load waveforms were applied to sharply notched samples and the load was adjusted so that for all tests the maximum stress intensity factor was constant and tensile, K max , but di…