Results 41 to 50 of about 59,176 (265)

An Ecological Definition and Objective Threshold for Differentiating Small Fragments [PDF]

Ecol Evol
Many ecological phenomena vary with fragment size. To quantify the impacts of small fragments on ecological pattern and process, one must differentiate them, but there is no agreed way to achieve this. We present an objective definition and method to identify a threshold size for small fragments that requires minimal data and can be readily calculated ...
Deane D, Hui C, McGeoch M.
europepmc   +2 more sources

Decoherence and asymptotic entanglement in open quantum dynamics

, 2007
In the framework of the theory of open systems based on completely positive quantum dynamical semigroups, we determine the degree of quantum decoherence of a harmonic oscillator interacting with a thermal bath.
Isar, Aurelian
core   +1 more source

Uncertainty, entropy and decoherence of the damped harmonic oscillator in the Lindblad theory of open quantum systems [PDF]

, 1999
In the framework of the Lindblad theory for open quantum systems, expressions for the density operator, von Neumann entropy and effective temperature of the damped harmonic oscillator are obtained.
Isar, A.
core   +3 more sources

Quantum decoherence and classical correlations of the harmonic oscillator in the Lindblad theory

, 2007
In the framework of the Lindblad theory for open quantum systems we determine the degree of quantum decoherence and classical correlations of a harmonic oscillator interacting with a thermal bath. The transition from quantum to classical behaviour of the
A. Isar, Alicki, Ammann, Anastopoulos, Brune, Caldeira, Cheng, Davies, Dodonov, Habib, Hu, Hu, Hu, Isar, Isar, Isar, Isar, Isar, Isar, Isar, Joos, Joos, Joos, Klappauf, Klappauf, Kokorowski, Lindblad, Lindblad, Morikawa, Nielsen, Paz, Sandulescu, Spohn, Turchette, Unruh, W. Scheid, Zeh, Zeh, Zurek, Zurek, Zurek, Zurek, Zurek, Zurek   +43 more
core   +1 more source

Health outcome of older hospitalized patients in internal medicine environments evaluated by Identification of Seniors at Risk (ISAR) screening and geriatric assessment

BMC Geriatrics, 2019
Background Hospitals are in need of valid and economic screening and assessment tools that help identifying older patients at risk for complications which require intensified support during their hospital stay.
Anne-Carina Scharf, Janine Gronewold, Christian Dahlmann, Jeanina Schlitzer, Andreas Kribben, Guido Gerken, Tienush Rassaf, Christoph Kleinschnitz, Richard Dodel, Helmut Frohnhofen, Dirk M. Hermann   +10 more
doaj   +1 more source

The Revised Identification of Seniors At Risk screening tool predicts readmission in older hospitalized patients: a cohort study

BMC Geriatrics, 2022
Background The Identification of Seniors at Risk (ISAR) screening tool is a widely-used risk stratification tool for older adults in the emergency department (ED). Few studies have investigated the use of ISAR to predict outcomes of hospitalized patients.
Jane McCusker, Rebecca N. Warburton, Sylvie D. Lambert, Eric Belzile, Manon de Raad   +4 more
doaj   +1 more source

Autofocusing of Maneuvering Targets in Terahertz Inverse Synthetic Aperture Radar Imaging Based on Damped Newton Method

Sensors, 2022
Maneuvering target imaging based on inverse synthetic aperture radar (ISAR) imaging has recently drawn significant attention. Among the many autofocusing technologies which are crucial in ISAR imaging, minimum-entropy-based autofocusing (MEA) is highly ...
Hetong Wang, Qi Yang, Hongqiang Wang, Bin Deng   +3 more
doaj   +1 more source

Categorical structures enriched in a quantaloid: orders and ideals over a base quantaloid

, 2004
Applying (enriched) categorical structures we define the notion of ordered sheaf on a quantaloid Q, which we call `Q-order'. This requires a theory of semicategories enriched in the quantaloid Q, that admit a suitable Cauchy completion.
Stubbe, Isar
core   +2 more sources

Deception Jamming Against ISAR With Coupled Two-Dimensional Compressive Sensing via Sub-Nyquist Sampling

IEEE Access, 2018
Sub-Nyquist sampling is a common means of interfering with inverse synthetic aperture radar (ISAR) imaging, which has been validated for the feasibility of 1-D compressive sensing (CS) ISAR imaging.
Jiyuan Chen, Xiaoyi Pan, Letao Xu, Wei Wang   +3 more
doaj   +1 more source

Translational Motion Compensation for ISAR Imaging Based on Range Joint Fast Orthogonal Matching Pursuit Algorithm

IEEE Access, 2022
Accurate translational motion compensation (TMC) is the key procedure of inverse synthetic aperture radar (ISAR) imaging. Under the condition of sparse aperture, the correlation of adjacent pulses is severely destroyed, which brings a few challenges to ...
Xu Wei, Jun Yang, Mingjiu Lv, Wenfeng Chen, Xiaoyan Ma   +4 more
doaj   +1 more source