Crystal structure of lutetium disilicate, Lu2Si2O7
LU2O7S12, monoclinic, C\Um\ (No. 12), a = 6.762(2) , b = 8.835(3) , c = 4.711(2) k, = 101.99(4), V= 275.3 3 , = 2, Rgf(F) = 0.019, wRretfF 2 ) = 0.045, T= 293 K.
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Anharmonicity in GaTe layered crystals
Abstract The temperature dependencies (10‐300 K) of seven Raman‐active mode frequencies in layered semiconductor gallium telluride have been measured in the frequency range from 25 to 300 cm ‐1 . Softening and broadening of the optical phonon lines are observed with increasing temperature. Comparison between the exper…
Simple method for determining the fast axis of a wave plate
Based on the metals property of modifying the phase of an incident beam, a simple method for identifying the fast axis of a wave plate independent of a standard retarder is demonstrated. © 2002 Society
Study of electrophysical characteristics of lead‐natural rubber composites as radiation shields
Abstract The dependence of the attenuation of both gamma rays and neutrons on lead concentration in leaded‐natural rubber composites incorporated with paraffin wax and boron carbide as radiation shields was investigated. Moreover, the dc conductivity and swelling characteristics of the rubber vulcanizates and the effe…
Polymeric Manganese Carboxylato Compounds [{Mn[m-C6H4(COO)2](C5H5N)2}n] and [{Mn(3-C5H4NCOO)2}n] with One- and Three-Dimensional Extended Structures
Abstract Two catena manganese carboxylato complexes [{Mn[m-C6H4(COO)2](C5H5N)2}n] (1) and [{Mn(3-C5H4NCO-O)2}n] (2) were synthesized and structurally characterized. Isophthalate together with pyridine as a capping ligand leads to a 1-D alternating chain structure of complex 1, while 3-pyridinecarboxylate (also known a…
Dielectric and mechanical properties of rubber ferrite composites
Rubber ferrite composites (RFCs) containing powdered nickel zinc ferrite (Ni1 - xZnxFe2O4 ) in a natural rubber matrix have been prepared and their mechanical and dielectric properties have been evaluated. Variations in the relative permittivity of both the ferrite ceramics and RFCs have been studied over a range of f…
Fine Structural Analysis of the Silk Apparatus in the Funnel‐web Spider, Agelena limbata (Araneae: Agelenidae)
ABSTRACT Silk apparatus of the funnel‐web spider, Agelena limbata was located at the ventral end of the abdominal part, and was composed of internal silk glands and external spinnerets. Among the three pairs of spinnerets, the posterior pairs were highly elongated along the body axis. By the light and electron microsc…
Polymer Melt Impregnation of Glass Roving
Abstract Much attention has been recently focussed on the melt impregnation of thermoplastic polymers as a consequence of the difficulty involved in driving viscous polymer melt into a tightly packed fiber bundle. This work studies an impregnation process consisting a series of staggered cylindrical pins in a melt poo…
Mainstream Smoke Gas Phase Filtration Performance of Adsorption Materials Evaluated With A Puff-by-Puff Multiplex GC-MS Method
Abstract The mainstream smoke filtration performance of activated carbon, silica gel and polymeric aromatic resins for gas-phase components was evaluated using a puff-by-puff multiplex gas chromatography-mass spectrometry (GC-MS) analysis method (1). The sample 1R4F Kentucky reference cigarettes were modified by placi…
Constituents from the Stems of Ecdysanthera Rosea
Six components were isolated from the stems of Ecdysanthera rosea. On the basis of spectra analysis, they were identified as 5-O-caffeoylquinic acid (1), methyl 5-O-caffeoyl quinate (2), butyl 5-O-caffeoyl quinate (3), scopoletin (4), β-sitisterol (5), and β-sitisterol glycoside (6). 5-Ocaffeoylquinic acid (1) is the…
Photo-Rubbing: A General Method to Induce Durable Liquid-Crystal Pretilt Angle on Photo-Alignment Films
A normal-incidence single-exposure scheme to obtain a stable pretilted alignment of nematic liquid crystals on photo-alignment polymer layers is proposed. The new scheme consists in periodically modulating the intensity of the normally incident linearly polarized near-ultraviolet light and unidirectionally scanning it…
Structural variations of epiphytic diatom communities on three macrophytes in a regulated river (Durance), in South-East of France
The epiphytic diatom communities living on two macroalgae, Chara vulgaris L. and Cladophora glomerata Kütz.) and one angiosperm Potamogeton densus L., were collected in the Mediterranean river Durance. Each macrophyte species was studied on the basis of three plant replicates, each of which cut into three segments. Al…
Crystal structure of the new barium zinc silicate Ba2ZnSi2O7
A ZnO
Improved optical design for the Large Synoptic Survey Telescope (LSST)
This paper presents an improved optical design for the LSST, an f/1.25 three-mirror telescope covering 3.0 degrees full field angle, with 6.9 m effective aperture diameter. The telescope operates at five wavelength bands spanning 386.5 nm to 1040 nm (B, V, R, I and Z). For all bands, 80% of the polychromatic diffracte…
Ca(SCN)2 and Ca(SCN)2 · 2 H2O: Crystal Structure, Thermal Behavior and Vibrational Spectroscopy
The dehydration of Ca(SCN) 2 ∙4H 2 O yields single crystals of Ca(SCN) 2 ∙ 2 H 2 O as well as of Ca(SCN) 2 . Ca(SCN) 2 ∙ 2 H 2 O crystallizes with a hitherto unknown structure (orthorhombic, Pnma, Z = 4, a = 1280.1(2), b = 790.3(1), c = 726.9(1) pm, R all = 0.0430). The Ca 2+ ions are surrounded by four SCN − ions and…
V-t characteristics of partial discharge inception in liquid nitrogen/ PPLP/sup /spl reg// composite insulation system for HTS cable
In this paper, we studied partial discharge (PD) inception characteristics and V-t characteristics of PD inception in liquid nitrogen (LN/sub 2/)/polypropylene laminated paper (PPLP/sup /spl reg//) composite insulation system for high temperature superconducting (HTS) cable. Experimental results revealed that the magn…
Unexpected fragmentation of β-substituted meso-tetraphenylporphyrins induced by high-energy collisional activation
The protonated molecules and radical cations of meso-tetraphenylporphyrins with beta-pyrrolic substituents, when formed by fast atom bombardment (FAB) and subjected to high-energy collisions, give rise to unexpected fragment ions. The reaction involves hydrogen migration from the ortho position of the phenyl ring to t…
Fabrication and optical properties of platinum nanowire arrays on anodic aluminium oxide templates
Arrays of Pt nanowires, fabricated by electrodepositing Pt metal into nanoporous anodic aluminium oxide (AAO) templates, exhibit a preferable optical absorption band in the ultraviolet-visible (UV-VIS) spectra and present a blueshift as the wire aspect ratio increases or its radius decreases. This type of optical prop…
Carboxyl terminated polyamide 12 chain extension by reactive extrusion using a dioxazoline coupling agent. Part II: Effects of extrusion conditions
Abstract Condensation reactions between a carboxyl terminated polyamide 12 and a dioxazoline carried out by reactive extrusion have been characterized in the first part of this study. In the present paper, we focus on the influence of extrusion conditions on reaction progress. Influences of screw profile, screw speed,…
Exploiting spiders’ silk
Scientists and engineers have long envied spiders’ ability to manufacture a material that is simultaneously strong, fine, and tough. This combination of properties makes spider silk an extremely attractive candidate for numerous applications in medicine, defense, and the leisure industry. Research teams worldwide are…