Materials Literature
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Fluorescence emissions at both 1.31 and 1.55 μm communication windows were observed from Pr 3+ /Er 3+ codoped Ge‐As‐Ga‐S glasses with a single wavelength pumping at 986 nm. The lifetime of the Er 3+ : 4 I 11/2 level decreased as the Pr 3+ concentration increased, and that of the Pr 3+ : 1 G 4 level increased as the Er…
We present a new high energy resonant x-ray scattering study of a brominated chiral liquid crystal material exhibiting antiferro, ferri and ferroelectric smectic C phases. The absorption K-edge of bromine is at much higher energy (13.49 keV) than the sulfur K-edge (2.47 keV) which should enable a wider variety of expe…
Abstract Investigation of third-order optical nonlinearity of complex 1, [C6H5N-R][Ni(mnt)2] where R = p-nitrobenzyl, mnt = maleonitrile-1,2-dithiolate, with 7 ns laser pulses at 532 nm shows that it exhibits negligible nonlinear absorption, but considerable nonlinear refraction. In terms of two calculated figures of…
Complexes of Y(III), La(III), Pr(III), Nd(III), Sm(III), Gd(III), Tb(III) and Dy(III) with salicylaldehyde benzoyl hydrazone, (C6H5CONHN[dbnd]CHC6H4OH), abbreviated as H2L, have been synthesized and characterized. The analytical data are suggestive of 2:3 metal: ligand stoichiometry in the complexes except in the case…
Examination of the gastrointestinal (GI) tract has been performed for decades using barium sulfate. Although this agent has many recognized limitations including extreme radiopacity, poor intrinsic affinity for the GI mucosa, and very high density, no alternative contrast agents have emerged which produce comparable o…
The permeability spectra of composite magnetic materials (NiZn ferrite composites and YIG composites) has been experimentally studied on a wide range in magnetic load C. The resonance frequency decreases with the increasing magnetic load of the mixture. This is attributed to the fading of the magnetic pole on the surf…
The crack‐growth behavior of a yttria‐stabilized zirconia ceramic (8 mol% of cubic‐phase yttria) was studied at room temperature. Double‐cantilever‐beam specimens were loaded with pure bending moments in a specially designed loading fixture inside an environmental scanning electron microscope. Crack‐growth data were o…
Nanoheterogeneous polymer networks based on polyurethanes (PU) were synthesised by utilisation of the competition between reactivity, dynamics and phase separation processes. Oligomeric α,ω-dihydroxyoxolanes (PTHF), 4,4′-methylene-bisphenylisocyanate (MDI), and trimethylolpropane (TMP) were chosen as reaction componen…
The dry etch behavior of Pt films using a TiO2 hard mask was investigated with an O2/Cl2/Ar gas chemistry in an inductively coupled plasma. The variations in etch rates and etch profiles of both the Pt films and the TiO2 masks were examined as a function of Cl2 and O2 concentration. It was found that the ratio of O2 t…
A significant improvement in the X-ray resolution of crystals of Escherichia coli inorganic pyrophosphatase at cryotemperature was obtained as a result of studying the relationship between the crystal order and cryosolution component concentrations. To perform the experiments, the ability to reverse the flash-cooling…
Hiperco ® FeCoV alloys are soft magnetic materials suitable for applications at high temperatures and under high stresses. We have studied the evolution of the rolling texture and its effects on the mechanical and magnetic properties after annealing the Hiperco® sheets at high temperatures. X-ray pole-figure measureme…
The ac-susceptibilities of the isostructural metal-orgnets magnets, MII(N(CN)2)2 (M = Ni (1), Co (2) and Fe (3)) have been studied as a function of temperature and pressure. Large variation in behaviors has been observed: the transition temperature initially increases in all three compounds and at higher pressures tha…
The mechanical properties and fracture mechanism of irradiated and unirradiated boron containing Type 304 stainless steel are studied. Four different batches with different boron weight percentages are used. One of these batches was manufactured by a conventional wrought technique, while the others were manufactured b…
Serrabrancaite is a new manganese phosphate from the Alto Serra Branca pegmatite near Pedra Lavrada, Paraiba, Brazil. The mineral occurs as dark brown to dark greenish black isometric crystals up to 0.3 mm size. The crystals have an adamantine luster and are translucent. Chemical analysis yields (in wt%) Mn 2 O 3 = 46…
Ultrasound of 28 kHz frequency in the range of 8–33 watt (W) was used to study the effect of ultrasound on permeate flux of peptone solution during ultrafiltration treatment of polysulfone (PS) membrane. Ultrasound irradiation enhanced the permeation flux through the membrane with increasing ultrasound power. The corr…
A model has been developed to examine the effect that different distributions of pinning and nucleation fields have upon the reversible magnetization behavior. The model allows each grain to be in one of three states, saturated in the positive and negative directions or containing a domain wall. The nucleation and pin…
NiFe, Ta films were fabricated by ion beam deposition (IBD) and diamond-like carbon (DLC) films by ion beam chemical vapor deposition (IB-CVD) and filtered cathodic arc (FCA) process. Magnetic dead layers at interfaces of Ta/NiFe/Tn and NiFe/Si/DLC trilayer films were determined by characterizing magnetic flux loss us…
Abstract Accurate optical method for measuring twist angle in TN LC cells is presented. Deviation of the measured values for different orientations of the cell and polarizes have been analyzed. The method allows to determine twist angle with high accuracy for cells with rubbed surfaces as well as for cells where at le…
Abstract A high performance color management architecture is presented for the projection of liquid crystal on silicon microdisplays. Based on ColorLink's ColorSelect™ polarization filter technology, and used in conjunction with polarizing beamsplitters, the system gives excellent performance with black to white contr…
Abstract We have fabricated a 13.3″ XGA (1024 by 768) TFT color sequential liquid crystal display using Optically Compensated Birefringency (OCB), illuminated by an LED backlight. We fabricated the color sequential display using mostly feasible process technology, and examined the performance and potential of a color…