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Acousto-optic star couplers for routing and broadcasting in local area networks
(Wiley Periodicals - Microwave and Optical Technology Letters, 1993-10-28)
Acousto-optic deflectors are introduced to be used as star couplers that perform broadcasting and routing in local area networks. Configurations for both single-wavelength and multiwavelength broadcast-and-select networks ...
Frequency-to-voltage converter based on Bloch oscillations in a capacitively coupled GaAs-GaxAl1-xAs quantum well
(American Physical Society, 1993-09-15)
A charged capacitor which is placed with a semiconductor in a closed loop will normally discharge in a characteristic time τ=1/RC. We show, however, that if a semiconductor of high purity is subjected to a rf bias with ...
Extracellular volume and transsarcolemmal proton movement during ischemia and reperfusion: a 31P NMR spectroscopic study of the isovolumic rat heart
(Wiley: NMR in Biomedicine, 1993-07)
We have measured, directly and simultaneously, changes in extracellular volume and intra- and extracellular pH during ischemia in the isolated rat heart using 31P NMR spectroscopy. Hearts were perfused with buffer containing ...
Experimental and numerical results on a millimeter-wave free electron laser amplifier
(Elsveier - Nuclear instruments and methods in physics research, 1993-07)
Progress in studies of a millimeter-wave free electron laser amplifier based on a small period planar wiggler and a sheet electron beam is reported. Successful propagation of a 15 A sheet electron beam has been accomplished ...
Morphosis of the Julia set of the real parameter family of complex quadratic maps
(Elsevier Science B.V., Amsterdam, 1993-05)
The present note explores the structure of the interior of Julia sets and of the Mandelbrot set of quadratic maps. These sets usually appear as ‘dark’ regions in the computer generated graphics of iterations of the quadratic ...
Linear pixel shuffling for image processing, an introduction
(International Society for Optical Engineering (SPIE), 1993-04)
We investigate a method of ordering pixels (the elements of a rectangular matrix) based on an arithmetic progression with wrap-around (modular arithmetic). For appropriate choices of the progression's parameters, based on ...
Structural characterization of an n-acetyl-2-aminofluorene (AAF) modified DNA oligomer by NMR, energy minimization, and molecular dynamics
(American Chemical Society: Biochemistry, 1993-03-16)
An N-acetyl-2-aminofluorene (AAF) modified deoxyoligonucleotide duplex, d(Cl-C2-A3-C4-[AAF-G5]-C6-A7-C8-C9)-d(GlO-G1 l-T12-G13-C14-G 15-T16-G 17-G18), was studied by one- and twodimensional NMR spectroscopy. Eight of the ...
Classification of trabecular structure in magnetic resonance images based on morphological granulometries.
(Wiley: Magnetic Resonance in Medicine, 1993-03)
A new method of detecting structured changes in trabecular bone, such as those associated with osteoporosis, was evaluated on magnetic resonance images of the wrist. The method was based on gray-scale morphological ...
Comparison of methods for generation of absolute reflectance factor values for bidirectional reflectance-distribution function studies
(Optical Society of America (OSA), 1993-03)
Currently, spectrophotometric standard reference materials are calibrated only by using the illumination
and viewing geometries recommended by the Commission Internationale de l'Eclairage, and for some
geometries the ...
Stark effect in nonlinear Jaynes-Cummings models
(American Physical Society, 1993-02)
We investigate the effect of the Stark shifts on the atomic-inversion dynamics when a multilevel atom interacts with a two-mode quantized radiation field. We utilize Hamiltonians obtained by adiabatically eliminating all ...