2,405 research outputs found
Radio Observations of 4079 Quasars
Using the NVSS radio catalog, we have searched for radio emission from 4079
quasars taken from the 1996 version of the Veron-Cetty and Veron (1996) quasar
catalog. The comparison resulted in the positive detection of radio emission
from 799 quasars. Of these, 168 are new radio detections. Examination of the
radio luminosities shows a dramatic increase in the fraction of radio-loud
quasars from the current epoch to z=0.5 and a gradual decline beyond z=1.0.
Inspection of the radio-loud fraction as a function of M_B shows little
dependence fainter than M_B=-29.5.Comment: 25 pages, including 9 figures and 1 tabl
Quantum-implemented selective reconstruction of high-resolution images
This paper proposes quantum image reconstruction. Input-triggered selection
of an image among many stored ones, and its reconstruction if the input is
occluded or noisy, has been simulated by a computer program implementable in a
real quantum-physical system. It is based on the Hopfield associative net; the
quantum-wave implementation bases on holography. The main limitations of the
classical Hopfield net are much reduced with the new, original --
quantum-optical -- implementation. Image resolution can be almost arbitrarily
increased.Comment: 4 pages, 15 figures, essential
Performance Evaluation of Vision-Based Algorithms for MAVs
An important focus of current research in the field of Micro Aerial Vehicles
(MAVs) is to increase the safety of their operation in general unstructured
environments. Especially indoors, where GPS cannot be used for localization,
reliable algorithms for localization and mapping of the environment are
necessary in order to keep an MAV airborne safely. In this paper, we compare
vision-based real-time capable methods for localization and mapping and point
out their strengths and weaknesses. Additionally, we describe algorithms for
state estimation, control and navigation, which use the localization and
mapping results of our vision-based algorithms as input.Comment: Presented at OAGM Workshop, 2015 (arXiv:1505.01065
Transition state energy decomposition study of acetate-assisted and internal electrophilic substitution C−H bond activation by (acac-O,O)_2Ir(X) complexes (X = CH_3COO, OH)
Chelate-assisted and internal electrophilic substitution type transition states were studied using a DFT-based energy decomposition method. Interaction energies for benzene and methane C−H bond activation by (acac-O,O)_2Ir(X) complexes (X = CH_3COO and OH) were evaluated using the absolutely localized molecular orbital energy decomposition analysis (ALMO-EDA). A ratio of ~1.5:1 for forward to reverse charge-transfer between (acac-O,O)_2Ir(X) and benzene or methane transition state fragments confirms “ambiphilic” bonding, the result of an interplay between the electrophilic iridium center and the internal base component. This analysis also revealed that polarization effects account for a significant amount of transition state stabilization. The energy penalty to deform reactants into their transition state geometry, distortion energy, was also used to understand the large activation energy difference between six-membered and four-membered acetate-assisted transition states and help explain why these complexes do not activate the methane C−H bond
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