Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPreparation of Structurally Well-Defined Polymer−Nanoparticle Hybrids with Controlled/Living Radical PolymerizationsTimothy von Werne and Timothy E. PattenView Author Information Department of Chemistry University of California at Davis One Shields Avenue, Davis, Calif…
Sapphire is an ideal visible-MWIR window due to its excellent optical and mechanical properties and its availability in large sizes up to 340-mm diameter boules. Anticipated applications for new, high performance optical systems call for even larger, 450-750 mm diameter, windows. The present effort has focused on prod…
We substituted neutral amino acids for some positively charged residues (R42, K107, K146, R148 and K229) that line the active site of aldolase A in an effort to determine binding sites for inositol 1, 4,5-trisphosphate. In addition, D33 (involved in carbon-carbon bond cleavage) was mutated. K229A and D33S aldolases sh…
It has recently been brought to my attention (M J Sablik, 1999, private communication) that in the above paper, which outlines a pair of differential equations for describing reversible and irreversible effects of stress on magnetization, part of the results shown in figure 9 cannot be obtained as a result of the appl…
In the present paper we report a high-fill factor uncooled IR micro-bolometer array; and, more particularly, a three- level IR bolometer including an almost 92 percent fill factor absorber and a separately-designed bridge structure for the electro-thermal isolation of thermal sensor; and a method for the silicon-based…
Impact of 600 eV protons at grazing incidence on LiF(100) is studied with a new coincidence technique combining energy loss and electron spectroscopy. Correlation between the secondary electrons and the charge state of the scattered projectiles demonstrates the role of the ${\mathrm{H}}^{\ensuremath{-}}$ ions formed o…
The dielectric properties of a MgO and Mg(NO 3 ) 2 doped and undoped talc are measured as a function of the frequency range 260 kHz-40 MHz. The ´, tan and ac values are given as a function of the firing temperature for a 5.0 MHz constant frequency. In this study the effects of an impurity and the firing temperature on…
We calculate the linear optical response of island films, considering, in particular, a statistical character of the geometry of the cluster assembly as well as electromagnetic interaction between the clusters in the film. The work involves Monte Carlo simulations of the island-film growth followed by aggregate calcul…
This paper will report on the properties and applications of polished polycrystalline diamond optical components produced by Chemical Vapor Deposition and fabricated in sizes and geometries suited to several IR window and some applications. Data will be presented on optical quality CVD diamond materials that has been…
We have investigated the performance of VO<SUB>2</SUB> microbolometers biased on the semiconducting-metal phase transition with negative electrothermal feedback. We deposited crystalline thin films of phase-pure VO<SUB>2</SUB>, patterned these films into useful test structures, and evaluated the electrical and optical…
A 320 X 240 uncooled IR focal plane array (IRFPA) with series PN junction diodes fabricated on a silicon-on- insulator (SOI) wafer has been developed. Resistive bolometers, pyroelectric detectors and thermopile detectors have been reported for large scale uncooled IRFPAs, while the detector developed uses the temperat…
LETI LIR has been involved in Amorphous Silicon uncooled microbolometer development for a few years. This paper reports recent progress that have been carried out both in technological and product field. Due to the very particular features of LETI LIR technology, large fill factor, high thermal insulation, associated…
We report a reversible phase transformation between the icosahedral Zn-Mg--rare-earth(RE) quasicrystal and the hexagonal crystal being not composed of any giant icosahedral atomic cluster. This clearly shows that the large atomic cluster is not an essential atomic configuration for quasicrystal formation. A structural…
The time post discharge of a low-pressure pulsed dc discharge in pure oxygen is used to investigate the atomic oxygen recombination on fused silica surface. With the intention of studying this recombination for different surface states, we perform before each pulsed experiment a wall treatment by means of dc discharge…
Introduction Ergodic theory Physics (for mathematicians) Order Symmetry Conclusion Appendix I: Geometry Appendix II: Algebra Appendix III: Analysis References List of symbols Subject Index.
The structural properties of nanostructured films obtained by deposition of supersonic beams of carbon clusters are investigated by classical molecular dynamics simulations and compared to experiments. Simulations are shown to predict how the structural properties of the deposited film depend on the actual growth prot…
This paper describes a new approach for the control of microbolometer detector array uniformity as a function of substrate temperature change. This approach, called the bias equalization method, uses an electronic means of controlling the microbolometer array uniformity. For this method a three stage non-uniformity co…
An aligned and well-distributed carbon nanotubes array was produced by pyrolysis of hydrocarbons catalyzed by nickel nanoparticles embedded in porous silicon (PS) substrates. Scanning electron microscope images show that the nanotubes form an aligned array approximately perpendicular to the surface of the PS substrate…
Rubber ferrite composites (RFC) are important since they have useful applications as microwave absorbers and flexible magnets. The mouldability of these composites into complex shapes is another advantage. The evaluation of their dielectric and magnetic properties is important in understanding the physical properties…
Optical gain spectra of ZnO epitaxial thin films have been measured by using a pump–probe technique. The optical gain is thought to be due to electron–hole plasma. In the differential absorption spectra, we observed saturation of the exciton absorption, band-gap renormalization, as well as the optical gain. From the t…