Quantum decoherence of the damped harmonic oscillator [PDF]
Optics and Spectroscopy 103, 252 (2007), 2006 In the framework of the Lindblad theory for open quantum systems, we determine the degree of quantum decoherence of a harmonic oscillator interacting with a thermal bath. It is found that the system manifests a quantum decoherence which is more and more significant in time.
A. Isar +9 more
arxiv +6 more sources
Lindblad master equation for the damped harmonic oscillator with deformed dissipation [PDF]
Physica A 322, 233 (2003), 2007 In the framework of the Lindblad theory for open quantum systems, a master equation for the quantum harmonic oscillator interacting with a dissipative environment, in particular with a thermal bath, is derived for the case when the interaction is based on deformed algebra.
A. Isar +32 more
arxiv +4 more sources
Categorical structures enriched in a quantaloid: regular presheaves, regular semicategories [PDF]
arXiv, 2004 We study presheaves on semicategories enriched in a quantaloid: this gives rise to the notion of regular presheaf. A semicategory is regular when its representable presheaves are regular, and its regular presheaves then constitute an essential (co)localization of the category of all of its presheaves.
Stubbe, Isar
arxiv +2 more sources
Phase Space Representation for Open Quantum Systems within the Lindblad Theory [PDF]
Int.J.Mod.Phys.B10:2767,1996, 1996 The Lindblad master equation for an open quantum system with a Hamiltonian containing an arbitrary potential is written as an equation for the Wigner distribution function in the phase space representation. The time derivative of this function is given by a sum of three parts: the classical one, the quantum corrections and the contribution due to the ...
Isar, A., Sandulescu, A., Scheid, W.
arxiv +5 more sources
Three-dimensional ISAR imaging: a review
The Journal of Engineering, 2019 Three-dimensional (3D) inverse synthetic aperture radar (ISAR) imaging has been proven feasible by combining traditional ISAR imaging and interferometry.
Marco Martorella +3 more
doaj +3 more sources
A Metalearning-based Sparse Aperture ISAR Imaging Method
Leida xuebao, 2023 Sparse Aperture-Inverse Synthetic Aperture Radar (SA-ISAR) imaging methods aim to reconstruct high-quality ISAR images from the corresponding incomplete ISAR echoes.
Jingyuan XIA +5 more
doaj +1 more source
An ISAR Image Component Recognition Method Based on Semantic Segmentation and Mask Matching
Sensors, 2023 The inverse synthetic aperture radar (ISAR) image is a kind of target feature data acquired by radar for moving targets, which can reflect the shape, structure, and motion information of the target, and has attracted a great deal of attention from the ...
Xinli Zhu +4 more
doaj +1 more source
CLISAR-Net: A Deformation-Robust ISAR Image Classification Network Using Contrastive Learning
Remote Sensing, 2022 The inherent unknown deformations of inverse synthetic aperture radar (ISAR) images, such as translation, scaling, and rotation, pose great challenges to space target classification. To achieve high-precision classification for ISAR images, a deformation-
Peishuang Ni +5 more
doaj +1 more source
A New Denoising System for SONAR Images
EURASIP Journal on Image and Video Processing, 2009 The SONAR images are perturbed by speckle noise. The use of speckle reduction filters is necessary to optimize the image exploitation procedures.
Alexandru Isar, Sorin Moga, Dorina Isar
doaj +2 more sources
Identification of hospitalized elderly patients at risk for adverse in-hospital outcomes in a university orthopedics and trauma surgery environment. [PDF]
PLoS ONE, 2017 As a consequence of demographic changes, hospitals are confronted with increasing numbers of elderly patients, who are at high risk of adverse events during hospitalization.
Janine Gronewold +3 more
doaj +1 more source