Results 261 to 270 of about 1,396,897 (310)

Influence of Solvent on Carbene Intersystem Crossing Rates

Journal of the American Chemical Society, 2008
The influence of coordinating solvents on singlet-to-triplet carbene intersystem crossing (ISC) rates has been studied with diphenylcarbene (DPC) and para-biphenyltrifluoromethylcarbene (BpCCF 3) by using ultrafast time-resolved spectroscopy. DPC has a triplet ground state in all of the solvents considered, and the concentration of singlet carbene at ...
Jin, Wang, Jacek, Kubicki, Huolei, Peng, Matthew S, Platz   +3 more
openaire   +2 more sources

Intersystem Crossing Rates of Isolated Fullerenes: Theoretical Calculations

The Journal of Physical Chemistry A, 2017
Although the triplet states of fullerenes have prosperous applications, it remains unclear how the structural parameters of singlet and triplet states control the intersystem crossing (ISC) rates. Here, electronic structure calculations (reorganization energy, driving force, and spin-orbit coupling) and a rate theory (Marcus formula) are employed to ...
Yuxiu Liu, Minsong Lin, Yi Zhao
openaire   +2 more sources

Level Crossing Rates in Transmit Beamforming Systems

IEEE Communications Letters, 2007
In this paper, the second-order statistics of the signal to noise ratio (SNR) at the output of a multiple-input-multiple-output (MIMO) system employing maximal ratio combining (MRC) are analyzed. Exact expressions for the level crossing rate (LCR) and the average fade duration (AFD) are derived for the Rayleigh propagation and arbitrary channel matrix ...
Predrag Ivanis, Dusan Drajic, Branka Vucetic   +2 more
openaire   +1 more source

Intermolecular Electron Transfer Reactivity Determined from Cross-Rate Studies

Accounts of Chemical Research, 2002
Electron-transfer cross-reactions between neutral molecules and their radical cations spanning a wide range of structural type and intrinsic reactivity have been analyzed using classical Marcus theory. The principal factor found to govern intrinsic reactivity is the inner-shell bond reorganization energy.
Stephen F, Nelsen, Jack R, Pladziewicz
openaire   +2 more sources

Correlations and Crossing Rates of Periodic-Stochastic Hydrologic Processes

Journal of Hydrologic Engineering, 2005
When a continuous valued hydrological series such as monthly stream flows is clipped by a constant or variable threshold series (such as water demand), a binary series may be obtained. Such a series may be useful for analyzing and modeling a variety of hydrological processes such as the occurrences of wet and dry days, deficit and surplus series, and ...
SALAS J. D, CHUNG C, CANCELLIERE, Antonino   +2 more
openaire   +2 more sources

Predicting Intersystem Crossing Rates with AIMS-DFT Molecular Dynamics

The Journal of Physical Chemistry A, 2018
Accurate prediction of the intersystem crossing rates is important for many different applications in chemistry, physics, and biology. Recently, we implemented the ab initio multiple spawning (AIMS) molecular dynamics method to describe the intersystem crossing processes, where nonradiative transitions between electronic states with different spin ...
Dmitry A. Fedorov, Aleksandr O. Lykhin, Sergey A. Varganov   +2 more
openaire   +2 more sources

Level crossing rates in binary counting systems

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1996
Abstract The statistics of threshold level crossings, which were first calculated by Rice [1], are applied to an amplifier system employing a realistic filter to derive the dependence of the rate on the magnitudes of the noise sources in the system.
openaire   +1 more source

Cross-Rate Synchronization of Loran-C Using GPS

Navigation, 1988
Loran-C transmitters are grouped into different chains, each with a specified group repetition interval (GRI) or group repetition rate (1/GRI). Currently, Loran-C transmitters in different chains are not tightly synchronized. Consequently, Loran receivers can compute time differences only between signals with the same GRI.
PER K. ENGE, GARY NOSEWORTHY
openaire   +1 more source

Speech zero-crossing rate compression for bandwidth compression

IEEE Transactions on Acoustics, Speech, and Signal Processing, 1975
As analysis performed on a proposed special purpose hearing aid yields data on single-sidebanded voice zero-crossing rates extracted by a phase-locked loop (PLL), and also data on the logarithmically compressed voltage analog of the zero-crossing rate.
W. Done, R. Kirlin
openaire   +1 more source

Automatic Continuous Speech Segmentation Using Level Crossing Rate

Advances in Pattern Recognition, 2006
In this paper, a new algorithm to automatically segment a continuous speech signal into phonemes is presented. The proposed method is based on the Average Level Crossing Rate (ALCR) of the speech signal, which is motivated by auditory models.1 It portrays that time information is more suitable to handle non-stationary signals. Based on this assumption,
null Nagesha, G. Hemantha Kumar
openaire   +1 more source