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Average Time-Delays for the Scattering of O Atoms from O Molecules.
J Chem Theory Comput
January 2025
Laboratoire ICB, UMR-6303 CNRS/uB, Université de Bourgogne, 9 avenue Alain Savary, 21078 Cedex Dijon, France.
We report full quantum-computed average microcanonical, initial state-specific, and canonical cumulative time-delays associated with the O + O scattering, presented as a function of total energy (in relation to an idealized molecular beam experiment) or temperature (for the properties of the gas phase in bulk conditions). We show that these quantities are well-defined and computable, with a temperature-dependent (canonical) time-delay presenting a smooth, monotonic decreasing behavior with temperature, despite an energy-dependent (microcanonical) time-delay of apparent chaotic character. We discuss differences in behavior when considering isotopic variations, O + OO and O + OO, with respect to the reference process O + OO and reveal a greater magnitude of the cumulative time-delay when genuinely reactive events can take place, in the presence of O.
View Article and Find Full Text PDFUnderwater image enhancement based on optimally weighted histogram framework and improved Fick's law algorithm.
Sci Rep
December 2024
School of Computer Science, Hubei University of Technology, Wuhan, 430068, China.
The quality of underwater images is often affected by light scattering and attenuation, resulting in a loss of contrast and brightness. To address this issue, this paper proposes an underwater image enhancement method: improved Fick's law algorithm-based optimally weighted histogram framework (IFLAHF). The method incorporates the bi-histogram equalization-based three plateau limits (BHE3PL) technique to enhance image contrast and details while maintaining brightness.
View Article and Find Full Text PDFRandom lasers owing the functionality of generating random spectra facilitate the chaotic encrypted systems essential for cryptography in the current information epoch. Nevertheless, single wavelength bands of random lasers provide an unsuitable key for image encryption that causes outline interpretation and a fragile complex dual chaotic encryption demanding secured image encryption. This research presents an inevitable development of a reversible switchable wavelength fiber random laser composed of the mixture of highly polarized intramolecular charge transfer dye molecules and the optimum concentration of titanium dioxide acting as gain and efficient scattering mediums respectively within a polyvinyl alcohol matrix.
View Article and Find Full Text PDFConsidering the obvious application value in the field of minimally invasive and non-destructive clinical healthcare, we explore the challenge of wide-field imaging and recognition through cascaded complex scattering media, a topic that has been less researched, by realizing wide-field imaging and pathological screening through multimode fibers (MMF) and turbid media. To address the challenge of extracting features from chaotic and globally correlated speckles formed by transmitting images through cascaded complex scattering media, we establish a deep learning approach based on SMixerNet. By efficiently using the parameter-free matrix transposition, SMixerNet achieves a broad receptive field with less inductive bias through concise multi-layer perceptron (MLP).
View Article and Find Full Text PDFChiSCAT: Unsupervised Learning of Recurrent Cellular Micromotion Patterns from a Chaotic Speckle Pattern.
Nano Lett
October 2024
Institute of Physics, University of Rostock, 18059 Rostock, Germany.
There is considerable evidence that action potentials are accompanied by "intrinsic optical signals", such as a nanometer-scale motion of the cell membrane. Here we present ChiSCAT, a technically simple imaging scheme that detects such signals with interferometric sensitivity. ChiSCAT combines illumination by a aotic speckle pattern and interferometric scattering microscopy () to sensitively detect motion in any direction.
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