Materials Literature
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Cathodoluminescence and photoluminescence of Bi12SiO20 and Bi12GeO20 samples are studied. Both kinds of samples show a dark orange central part or core. Emissions in the blue, green, and red spectral regions are observed. The 640 nm band is the predominant feature in the core emission. The evolution of this band durin…
Abstract The optical properties of Er 3+ ions in zinc borosulphate (ZnSO 4 · 7 H 2 O + B 2 O 3 ) and alkali zinc borosulphate (R 2 SO 4 + ZnSO 4 · 7H 2 O + B 2 O 3 , R 2 SO 4 = Li 2 SO 4 · H 2 O, Na 2 SO 4 , or K 2 SO 4 and Gd 2 (SO 4 ) 3 · 8H 2 O) glasses are reported. The assigned energy level data of Er 3+ (4f 11 )…
Abstract A simple and new synthetic method of tungstate thin films (CaWO4, MgWO4, PbWO4, ZnWO4) was developed. The absorption and luminescence spectra of tungstate thin films synthesized on quartz substrates were measured; the optical properties were also studied. It was found that CaWO4 has Eg = 5.4 eV of a direct tr…
Etching of a photosensitive polymer in high density oxygen plasma was studied. The polymer is a commonly used insulation material in a magnetic recording head. A quantitative relationship between etch rate and inductive power, bias power, and pressure was established by using the response surface method. Etch rate was…
The NIST Crystal and Electron Diffraction Data Center builds a comprehensive database with evaluated chemical, physical, and crystallographic information on all types of well-characterized substances. The data are evaluated and standardized by specially designed computer programs as well as by experts in the field. Fr…
The paper presents a new method of taking into account overlapping zones in stacked transformer cores for magnetic field calculations. The method has been worked out with the use of homogenization technique under the assumption that the distribution of magnetic flux between the layers of overlaps results from the tend…
A carbon-carbon double bond has been introduced into an aliphatic alkoxy terminal chain of 2,3- or 2′,3′- difluoroterphenyl systems. The effect of the position and nature (E/Z) of the double bond on the mesomorphic behaviour of these compounds in comparison with the parent systems has been studied. The smectic C therm…
The Embedded Atom Method (EAM) is a semi-empirical calculational method developed a decade ago to calculate the properties of metallic systems. By including many-body effects this method has proven to be quite accurate in predicting bulk and surface properties of metals and alloys. Recent modifications have extended t…
Abstract The effects of blow‐molding process variables on the environmental stress crack resistance (ESCR) of high‐density polyethylene (HDPE) bottles were studied. Experimental design was employed to test the effect of die temperature, mold temperature, molding time, and drop time. Bottles blown at each condition wer…
Liquid crystal (LC) devices arc presented which convert linearly polarized light into linearly polarized light with axial symmetry. Their symmetry axis is determined by the propagation axis of the light beam. Such light fields can be characterized by an integer P, which we call the polarization order number. Our LC de…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation N. C. Andrews, A. J. McHugh, B. J. Edwards; Out‐of‐plane orientational dynamics of polymer liquid…
Transparent-photoluminescent Y3Al5O12:Tb (YAG:Tb) thin films were deposited on single- crystalline sapphire at two different substrate temperatures by means of the pulsed laser deposition technique. The ablation targets were fabricated from YAG:Tb powders obtained with a new ceramic processing technique (combustion sy…
The zone-drawing method (ZD) was applied to electrochemically synthesized polypyrrole films containing tosylate (PPy/TsO) and the mechanical and electrical properties of the resulting films were investigated. It was found that the electrical conductivity of the zone-drawn film reached 365 S cm−1 in the drawing directi…
The adhesion energy, G (at low separation velocities), between a rubber and a solid surface, is expected to increase when flexible chains, chemically identical to the rubber, are attached to the surface. This can be set up with or without chemical binding of the chains to the rubber (“bound” chains or “free” chains).
Thalassiosira yabei and its allied forms, which are important constituents of North Pacific high-resolution biostratigraphic framework, are taxonomically re-examined. Eleven morphotypes within the morphological variation of the diatoms previously reported as fossil marine plicated Thalassiosira have been distinguished…
The Fisher–Widom (FW) line is the locus of points in the density–temperature (ρ,T) plane where the longest range decay of the pairwise correlation function of a fluid crosses over from monotonic to damped oscillatory decay. The FW line for a hard-core potential with an attractive Yukawa tail is calculated using two in…
This research investigates the morphological evolution of diamond films in combustion synthesis as a basis for understanding the nucleation and growth mechanisms of the diamond phase. Various diamond films were synthesized from an oxyacetylene flame on a molybdenum substrate under atmospheric conditions. To identify t…
Numerically efficient Preisach-based vector hysteresis models for ellipsoidally magnetizable media are presented. Both models are based on orthogonal coupled scalar models and take into consideration the variation in particle switching fields and interaction; however, the coupling mechanism is different in the two mod…
A new model of scalar static magnetic hysteresis based on the superposition of Krasnoselkii hysterons of stop type is described. Unlike the magnetic hysteresis models known in literature, the present one naturally implements the constitutive relationship H=H[B]. In this respect it allows to formulate a field problem d…
Small-angle neutron scattering has been combined with equilibrium dynamic light scattering to study shear-induced mixing in a diluted high-molecular-weight polymer blend. The data show an enhancement of critical fluctuations upon dilution and are found to collapse onto a universal scaling curve containing no free para…