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Littérature scientifique sur le sujet « Vibrational quenching »

Auteur : Grafiati
Publié le 9 mars 2023
Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "Vibrational quenching"

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Richards, Caleb, Elijah Jans, Ilya Gulko, Keegan Orr et Igor V. Adamovich. « N2 vibrational excitation in atmospheric pressure ns pulse and RF plasma jets ». Plasma Sources Science and Technology 31, no 3 (1 mars 2022) : 034001. http://dx.doi.org/10.1088/1361-6595/ac4de0.

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Abstract Time-resolved N2 vibrational temperature and translational–rotational temperature in quasi-two-dimensional atmospheric pressure plasma jets sustained by ns pulse and RF discharges in nitrogen/noble gas mixtures are measured by the broadband vibrational Coherent Anti-Stokes Raman Scattering (CARS) . The results indicate a much stronger vibrational excitation in the RF plasma jet, due to the lower reduced electric field and higher discharge power. In a ns pulse discharge in N2/He, N2 vibrational temperature is significantly lower compared to that in N2/Ar, due to the more rapid vibration–translation (V–T) relaxation of nitrogen by helium atoms. In the RF plasma jets in N2/Ne and N2/Ar, the vibrational excitation increases considerably as the nitrogen fraction in the mixture is reduced. The experimental data in the RF plasma jet in N2/Ar jet are compared with the kinetic modeling predictions. The results indicate that nitrogen vibrational excitation in N2/Ar plasma jets with a small N2 fraction in the mixture (several percent) is controlled primarily by electron impact, anharmonic vibration–vibration (V–V) pumping, and V–T relaxation by N atoms. In comparison, V–V energy transfer from the vibrationally excited molecules in the first excited electronic state, N2(A3Σu +, v), which are generated primarily by the energy transfer from the metastable Ar atoms, has a minor effect on the vibrational populations of the ground electronic state, N2(X1Σg +, v). Although the discharge energy fraction going to electronic excitation is significant, the predicted quasi-steady-state N2(A3Σu +) number density, controlled by the energy pooling and quenching by N atoms, remains relatively low. Because of this, the net rate of N2(X1Σg +) vibrational excitation by the V–V energy transfer from N2(A3Σu +) is much lower compared to that by the direct electron impact. The results show that atmospheric pressure RF plasma jets can be used as sources of highly vibrationally excited N2 molecules and N atoms.
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Morris, Robert A., A. A. Viggiano, F. Dale et John F. Paulson. « Collisional vibrational quenching of NO+(v) ions ». Journal of Chemical Physics 88, no 8 (15 avril 1988) : 4772–78. http://dx.doi.org/10.1063/1.454690.

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Forrey, Robert C., B. H. Yang, P. C. Stancil et N. Balakrishnan. « Mutual vibrational quenching in CO + H2 collisions ». Chemical Physics 462 (novembre 2015) : 71–78. http://dx.doi.org/10.1016/j.chemphys.2015.07.001.

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Feofilov, A. G., A. A. Kutepov, W. D. Pesnell, R. A. Goldberg, B. T. Marshall, L. L. Gordley, M. García-Comas et al. « Daytime SABER/TIMED observations of water vapor in the mesosphere : retrieval approach and first results ». Atmospheric Chemistry and Physics Discussions 9, no 3 (26 juin 2009) : 13943–97. http://dx.doi.org/10.5194/acpd-9-13943-2009.

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Abstract. This paper describes a methodology for water vapor retrieval using 6.6 μm daytime broadband emissions measured by SABER, the limb scanning infrared radiometer on board the TIMED satellite. Particular attention is given to accounting for the non-local thermodynamic equilibrium (non-LTE) nature of the H2O 6.6 μm emission in the mesosphere and lower thermosphere (MLT). The non-LTE H2O (ν2) vibrational level populations responsible for this emission depend on energy exchange processes within the H2O vibrational system as well as on interactions with vibrationally excited states of the O2, N2, and CO2 molecules. The paper analyzes current H2O non-LTE models and, based on comparisons with the ACE-FTS satellite solar occultation measurements, suggests an update to the rate coefficients of the three most important processes that affect the H2O(ν2) populations in the MLT: a) the vibrational-vibrational (V–V) exchange between the H2O and O2 molecules; b) the vibrational-translational (V–T) process of the O2(1) level quenching by collisions with atomic oxygen, and c) the V–T process of the H2O(010) level quenching by collisions with N2, O2, and O. We demonstrate that applying the updated H2O non-LTE model to the SABER radiances makes the retrieved H2O vertical profiles in 50–85 km region consistent with climatological data and model predictions.
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Ackland, Graeme J. « Rapid Equilibration by algorithmic quenching the ringing mode in molecular dynamics ». MRS Advances 1, no 42 (2016) : 2857–65. http://dx.doi.org/10.1557/adv.2016.382.

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ABSTRACTLong wavelength acoustic phonons are normally weakly coupled to other vibrational modes in a crystalline system. This is particularly problematic in molecular dynamics calculations where vibrations at the system-size scale are typically excited at initiation. The equilibration time for these vibrations depends on the strength of coupling to other modes, so is typically very long. A very simple deterministic method is presented which removes this problem. Examples of equilibration in lithium and a martensitic phase transition in sodium are used to demonstrate the method.
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Klemperer, W., C. C. Chuang, K. J. Higgins, A. Stevens Miller et H. C. Fu. « Spectroscopy of van der Waals molecules : Isomers and vibrational predissociation ». Canadian Journal of Physics 79, no 2-3 (1 février 2001) : 101–8. http://dx.doi.org/10.1139/p01-006.

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The inert-gas-halogen complexes have been studied for several decades by jet spectroscopy. Much of the seemingly bizarre behavior has become understandable in terms of two virtually isoenergetic isomer forms. The recently recognized linear isomer of Ar–I2 has a virtually continuous B ¬ X excitation spectrum. It also undergoes a very rapid vibrational predissociation, and suffers no electronic quenching from the B state. The well-known T-shaped isomer shows slow vibrational predissociation, which is competitive with electronic quenching. The quenching distorts the vibrational distribution of the I2 B state photofragments, consequently leading to a false estimation of the T-shaped Ar–I2 (B) state dissociation energy. The binding energies for the T-shaped Ar–I2 (X) and Ar–I2 (B) are unambiguously determined from the recent dispersed fluorescence study, which are also in good accord with the ab initio calculation. We discuss aspects of pure vibrational laser-induced fluorescence of hydrogen fluoride complexes. We contrast the behavior of Ar–HF with Ne–HF and present new results for the vHF = 3 level of Ne–HF. PACS Nos.: 33.80Gj, 34.30th
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Slanger, Tom G. « Vibrational excitation in ». Canadian Journal of Physics 64, no 12 (1 décembre 1986) : 1657–63. http://dx.doi.org/10.1139/p86-289.

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Excitation processes for [Formula: see text] in aurorae, in the nightglow, and in laboratory sources are discussed. It is shown that the observed vibrational distribution in aurorae is consistent with the [Formula: see text] + NO charge-transfer mechanism. Arguments are presented for the case that quenching of O2(b) in vibrational levels above ν′ = 1 is rapid, and that therefore the auroral source is much larger than previously supposed. It is suggested that oxygen atoms are an efficient quencher for O2(b) levels above ν′ = 1.
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Giancarlo, Leanna C., et Marsha I. Lester. « Vibrational predissociation and electronic quenching dynamics of  (Σ) ». Chemical Physics Letters 240, no 1-3 (juin 1995) : 1–9. http://dx.doi.org/10.1016/0009-2614(95)00493-n.

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Cheng, Rong, Wen-Cai Lu, K. M. Ho et C. Z. Wang. « Localized electronic and vibrational states in amorphous diamond ». Physical Chemistry Chemical Physics 23, no 8 (2021) : 4835–40. http://dx.doi.org/10.1039/d0cp06393b.

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Amorphous diamond structures with more than 97% of sp3 bonding fraction are generated by quenching liquid carbon using tight-binding molecular-dynamics simulations. The electronic and vibrational properties of the amorphous sample are investigated.
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Ferguson, Eldon E. « Vibrational quenching of small molecular ions in neutral collisions ». Journal of Physical Chemistry 90, no 5 (février 1986) : 731–38. http://dx.doi.org/10.1021/j100277a008.

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Thèses sur le sujet "Vibrational quenching"

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Liu, Qingnan. « Collisional quenching dynamics and reactivity of highly vibrationally excited molecules ». College Park, Md. : University of Maryland, 2008. http://hdl.handle.net/1903/8817.

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Thesis (Ph. D.)--University of Maryland, College Park, 2008.
Thesis research directed by: Dept. of Chemistry and Biochemistry. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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KARAMSHUK, SVITLANA. « Organic sensitizers for application in photonic and photovoltaic devices ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2015. http://hdl.handle.net/10281/76622.

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With the increasing demand for reliable and efficient devices with minimal environmental impact, novel organic materials gain extreme interest in the research community and industry. In this work we present synthetic strategies towards new organic compounds as promising materials for dye sensitized solar cells (DSCs) and low-cost integrated optics along with the investigation of these materials in devices. Despite the recent hype in the research community around DSCs, increasing efficiency of DSCs is still a challenge. In principle, one promising way to obtain DSCs with significantly enhanced efficiency lies in connecting an n-type photoelectrode (i.e. n-Dye/TiO2) with a p-type one (i.e. p-Dye/NiO) leading to a tandem cell composed by two serially connected photoactive electrodes, each contributing with its own photovoltage to the total photovoltage delivered by the cell. Applying such concept could theoretically lead to organic photovoltaic devices with up to 40% overall conversion yield. One of the main limitations in p-type systems, commonly based on NiO, arises from fast charge recombination between the photoinjected hole in NiO, and the reduced dye. Therefore it is crucially important to develop p-type chromophores which could produce a long-lived charge separated state and minimize back recombination. We were thus triggered to explore new organic structures for potentially efficient chromophores for p-type devices, by considering that the intramolecular charge transfer, at the basis of efficient charge separation in donor-acceptor dyes, is strongly dependent on the electron-withdrawing ability of the acceptor. Herein we present charge separators based on organic push-pull systems of tryphenylamine donors and branched electron acceptors (SK2-3-4) based either on Dalton (SK2) or benzothidaziole acceptor groups (SK3-4) which were synthesized and characterized by steady state spectroscopic, electrochemical and computational means. All the dyes exhibit strong charge transfer bands in the visible regions with ground and excited state energetics which are favourable to the sensitization of NiO electrodes. The computational investigation revealed a clear directionality of the lowest excited state exhibiting a marked charge transfer character, shifting the electron density to the acceptor branches, an electronic situation which is favourable to the hole injection in p-type semiconductors. When tested in p-type DSCs the SK series was found capable to sensitize NiO electrodes. The charge recombination kinetics, probed by considering the charge transfer resistance at the NiO/electrolyte interface at a comparable chemical capacitance, showed that the dyes behaved similarly and that the higher Voc observed with the SK4 dye is ostensibly due to a positive shift of the valence band edge, consistent with the shift in the anodic current threshold observed in dark conditions. The second part of this work is dedicated to synthesis and characterisation of metallo-organic materials for optoelectronic devices. Optical amplification plays crucial role in the transmission and manipulation of optical signals in modern telecomunications. Nowadays amplifiers, which rely on erbium ions in a glass matrix, suffer from difficulties in fabrication and the need of high pump power densities to produce gain. Here we show a newly synthesised series of organic fully halogenated optical amplifier materials. We will compare the ability of materials with different halogen atoms in complexes with transition metals to provide population of triplets which together with the lack of CH or OH oscillators in the molecule, can be potentially used as an efficient chromophore to sensitise the erbium ions in a long-lifetime erbium complex. Finally by doping Er(FTPIP)3 with newly designed Zn and Co complexes, we aim to find differences in the lifetime emission from erbium at the important telecommunication wavelength of 1.5 μm.
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Yan, Zhimiao. « Modeling of Nonlinear Unsteady Aerodynamics, Dynamics and Fluid Structure Interactions ». Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/71824.

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We model different nonlinear systems, analyze their nonlinear aspects and discuss their applications. First, we present a semi-analytical, geometrically-exact, unsteady potential flow model is developed for airfoils undergoing large amplitude maneuvers. Towards this objective, the classical unsteady theory of Theodorsen is revisited by relaxing some of the major assumptions such as (1) flat wake, (2) small angle of attack, (3) small disturbances to the mean flow components, and (4) time-invariant free-stream. The kinematics of the wake vortices is simulated numerically while the wake and bound circulation distribution and, consequently, the associated pressure distribution are determined analytically. The steady and unsteady behaviors of the developed model are validated against experimental and computational results. The model is then used to determine the lift frequency response at different mean angles of attack. Second, we investigate the nonlinear characteristics of an autoparametric vibration system. This system consists of a base structure and a cantilever beam with a tip mass. The dynamic equations for the system are derived using the extended Hamilton's principle. The method of multiple scales is then used to analytically determine the stability and bifurcation of the system. The effects of the amplitude and frequency of the external force, the damping coefficient and frequency of the attached cantilever beam and the tip mass on the nonlinear responses of the system are determined. As an application, the concept of energy harvesting based on the autoparametric vibration system consisting of a base structure subjected to the external force and a cantilever beam with a tip mass is evaluated. Piezoelectric sheets are attached to the cantilever beam to convert the vibrations of the base structure into electrical energy. The coupled nonlinear distributed-parameter model is developed and analyzed. The effects of the electrical load resistance on the global frequency and damping ratio of the cantilever beam are analyzed by linearizion of the governing equations and perturbation method. Nonlinear analysis is performed to investigate the impacts of external force and load resistance on the response of the harvester. Finally, the concept of harvesting energy from ambient and galloping vibrations of a bluff body is investigated. A piezoelectric transducer is attached to the transverse degree of freedom of the body in order to convert the vibration energy to electrical power. A coupled nonlinear distributed-parameter model is developed that takes into consideration the galloping force and moment nonlinearities and the base excitation effects. The aerodynamic loads are modeled using the quasi-steady approximation. Linear analysis is performed to determine the effects of the electrical load resistance and wind speed on the global damping and frequency of the harvester as well as on the onset of instability. Then, nonlinear analysis is performed to investigate the impact of the base acceleration, wind speed, and electrical load resistance on the performance of the harvester and the associated nonlinear phenomena. Short- and open-circuit configurations for different wind speeds and base accelerations are assessed
Ph. D.
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« On optimal tracking and sliding mode control with application to vibration quenching ». Tulane University, 1999.

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Present day research in modeling and control of flexible structures has gained a renewed interest, particularly in aerospace and industry, where robot manipulators play a very significant role. In the present dissertation, the infinity-horizon or Steady State Linear Quadratic Tracking Problem (SS LQT) has been applied to suppress vibrations in flexible beams. It is well known that the SS LQT problem does not have a solution in the strict sense because in general the cost is unbounded. However, for applications where the reference signal is generated by an asymptotically stable system, the problem is well posed and enjoys a bounded cost. Computationally, one term in the solution is found by solving an Algebraic Riccati Equation; and the second term involves an auxiliary function v(t) found by solving a differential equation backward in time to determine v(0) which is then used in the actual control run. An important contribution of this dissertation is the development of a linear system of algebraic equations to determine v(0) that will allow implement the controller without having to solve off-line and backward in time for v( t). A second problem that is addressed in this dissertation is the simulation of the tracker. Once that we have v(0) is not always possible to simulate and implement the controller, this is due to round-off and truncation errors. To solve this problem a model follower technique is applied. In addition, we consider that the flexible beam is driven for a nonlinear actuator, and a technique based on Sliding Mode Control is presented to reintroduce the nonlinear model to our original design
acase@tulane.edu
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Livres sur le sujet "Vibrational quenching"

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Goldfield, Evelyn M. Wavepacket dynamics of vibrational quenching in collisions of Kr and O₂⁺. Ithaca, N.Y : Cornell Theory Center, Cornell University, 1992.

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Tondl, Aleš. Quenching of self-excited vibrations. Amsterdam : Elsevier, 1991.

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International, SRI, et United States. National Aeronautics and Space Administration., dir. Rotational and translational effects in collisions of electronically excited diatomic hydrides. Menlo Park, Calif : Molecular Physics Laboratory, SRI International, 1988.

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Rotational and translational effects in collisions of electronically excited diatomic hydrides. Menlo Park, Calif : Molecular Physics Laboratory, SRI International, 1988.

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Chapitres de livres sur le sujet "Vibrational quenching"

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Ferguson, Eldon E. « Production, Quenching and Reaction of Vibrationally Excited Ions in Collisions with Neutrals in Drift Tubes ». Dans Structure/Reactivity and Thermochemistry of Ions, 81–95. Dordrecht : Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3787-1_5.

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« Quenching of self-excited vibration ». Dans Non-linear Vibrations, 278–322. Cambridge University Press, 1986. http://dx.doi.org/10.1017/cbo9780511735752.011.

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Yoshitake, Yutaka, et Atsuo Sueoka. « Quenching of Self-Excited Vibrations by Impact Damper ». Dans World Scientific Series on Nonlinear Science Series A, 155–76. WORLD SCIENTIFIC, 2000. http://dx.doi.org/10.1142/9789812796301_0007.

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Actes de conférences sur le sujet "Vibrational quenching"

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Luque, Jorge, et David R. Crosley. « Rotational dependence of quenching of NO B2Π by NO ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1993. http://dx.doi.org/10.1364/oam.1993.mtt.3.

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The behaviour of quenching of the NO B2Π state with NO collider has been studied using the B-X transition. Different rotational lines were excited in the vibrational levels v' = 0, 2, and 3 by laser radiation in a cell containing slowly flowing gas. Single exponential decays were observed, and the decay constants plotted vs. pressure to obtain quenching rate coefficients kQ. The radiative lifetimes from the intercepts are close to accepted values and independent of rotation.1 kQ for low N are about 8 µs-1Torr-1, and similar for all vibrational levels studied. This contrasts with results for other colliders in previous experiments,1,2 which found v = 1 and 2 to quench much more slowly than v = 0 and 3. In each level there exists a rotational dependence of kQ, exhibiting a smooth decrease of about 10% when N increases from 1 to 20.
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Butler, James J., John Burris, Thomas McGee et William Heaps. « Rotational and vibrational energy transfer and electronic quenching of OH (A2Σ+, v′ = 1) ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1986. http://dx.doi.org/10.1364/oam.1986.wj2.

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A Nd:YAG pumped frequency-doubled dye laser is used to excite X2π, v″ = 1, N′ OH radicals to a specific N' state of A2Σ+, v′ = 1. OH radicals are produced in a differentially pumped flow system by the reaction of H atoms produced by a microwave discharge in a molecular hydrogen and NO2. The total energy transfer rate, kT, is determined by monitoring the time decay of single rotational fluorescence lines as a function of colliding gas pressure. Using nitrogen as a colliding gas, kT is found to decrease from (6.4 ± 0.3) × 10−10 cm3 for excitation in N' = 0 to (4.0 ± 0.2) × 10−10 cm3/s for excitation in N' = 4. In the absence of colliding gas, the fluorescence lifetime of OH is observed to lengthen in regular fashion with increasing N' from 594 ns for N' = 0 excitation to 667 ns for N' = 4 excitation. The kT is made up of the electronic quenching rate, the rotational energy transfer rate, and the vibrational energy crossover rate. The vibrational crossover rate is determined for specific N' excitations by integrating the rotationally resolved 0 → 0 and 1 → 1 vibrational bands in OH fluorescence spectra between 3060 and 3180 Å as a function of N' and colliding gas pressure. The electronic quenching rate is determined by monitoring the time decay of OH fluorescence in the 1 → 1 vibrational band as a function of colliding gas pressure.
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Gray, J. A., J. L. Durant, P. H. Paul et J. W. Thoman. « Electronic quenching and vibrational energy transfer in NO (A2∑+) from 300 to 4500 K ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oam.1992.wl6.

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We report rate coefficients for electronic quenching of NO (A 2 ∑+) by N2, Ar, and NO (X 2 ∏) measured at room temperature and behind incident and reflected shock waves (900 K to 4500 K). The N2 quenching cross-section increases dramatically from 0.007 Å2 at 296 K to 7 Å2 at 4500 K. Modeling based on an ion-pair intermediate for the collision accurately predicts the increase in N2 cross-section up to 2300 K and suggests that additional mechanisms become important at higher temperatures. We also use simultaneous measurements of dispersed fluorescence spectra and fluorescence decay rates from v' = 0 and v' = 1 to obtain vibrational energy transfer rates in A 2 ∑+ at 1900 K.
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Steffens, Kristen L., Jay B. Jeffries et David R. Crosley. « Vibrational energy transfer from v' = 3 of OH(A) in flames ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oam.1992.tugg6.

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Excitation of v' = 3 in A2Σ+ OH is popular for flame LIF measurements, in part because of the reduced influence of collisional effects on this rapidly predissociating level. However, at atmospheric pressure a large fraction (over 50%) of the total light emitted can originate from levels populated by vibrational transfer from v' =3. Fluorescence scans following laser excitation of v′ = 3 made in the burnt gases of flames between 14 and 760 Torr show an increasing population in v' = 0, 1, 2 with increasing pressure. H2/O2 flames where H2O is the primary collider show the least transfer, CH4/O2 (H2O and CO2) more, and CH4/air (with N2 collider, efficient for VET but poor at quenching) the most. There is a small decrease in VET with increasing ro­tational level.
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Kim, Suchan, Bagher M. Tabibi, Kyo D. Song, Sang H. Choi et Ja H. Lee. « Radiative Properties of Molecular Nitrogen Ions Produced by Penning Ionization and Argon Effects ». Dans Inaugural Forum for the Research Center for Optical Physics. Washington, D.C. : Optica Publishing Group, 1993. http://dx.doi.org/10.1364/rcop.1993.tpls25.

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Molecular nitrogen ions, N2+, are generated by the helium Penning ionization in a glow discharge chamber. In the B-X system of N2+ the rotational lines of the most prominent band, 391.44 nm (0,0), are resolved by a 0.5 m-long scanning monochromator. Four vibrational lines of N2+ are measured. A rotational temperature of tr = 304.6 K and a vibrational temperature of about 12000 K were measured. To define argon effects on the N2+ emission, the 391.44 nm line intensity was analyzed. N2+ radiation is reduced to half as argon added up to 50% to N2. This could be resulted in quenching or/and the charge exchange with either N2+ or N2+* by argon.
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Mack, J. A., J. M. Price et Alec M. Wodtke. « Stimulated Emission Pumping (SEP)1 Studies of Energy Transfer in Highly Vibratonally Excited Oxygen ». Dans High Resolution Spectroscopy. Washington, D.C. : Optica Publishing Group, 1993. http://dx.doi.org/10.1364/hrs.1993.mb5.

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Recent results have shown that highly vibrationally excited O2 is formed in significant quantities from the ultraviolet photolyis of ground state ozone. An important question for understanding the balance of O3 in the upper atmosphere is the lifetime of these highly vibrationally excited molecules which are proposed2 to be a photolytic source of odd oxygen atoms. In this work we report the rate constants for the collisional deactivation of SEP prepared O2(v"=18-25) by O2(v"=0), at temperatures of 295 and 395 K. The experiments are analogous to the "Pump", "Dump" and "Probe" studies carried out by Yang et al on NO.3 A pulsed tunable Argon Fluoride laser is used to "PUMP" O2 from X 3 Σ u − ground electronic state to a specific rovibrational level of the B 3 Σ g − excited electronic state via the well known Schumann-Runge bands4. A Xenon-Chloride pumped tunable dye laser system then stimulates, or "DUMPS" the O2 back to a specific excited rovibrational level of the ground electronic state. A second tunable dye laser system then "PROBES" the vibrationally excited O2 population by Laser Induced Fluorescence. By varying the time delay between the DUMP and PROBE lasers, the time dependant occupation of the prepared vibrational level is monitored. The collisional quenching rate constant for a given vibrational level is then determined from the pressure dependance of the lifetime. Implications of the measured rates for atmospheric chemical reactions are discussed.
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Trautt, Thomas A., et Eduardo Bayo. « Active Vibration Quenching Using Inverse Dynamics ». Dans ASME 1995 Design Engineering Technical Conferences collocated with the ASME 1995 15th International Computers in Engineering Conference and the ASME 1995 9th Annual Engineering Database Symposium. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/detc1995-0578.

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Abstract An inverse dynamics algorithm is derived for active vibration quenching of structures. The algorithm uses frequency domain technicques to compute an input function needed to produce a desired response at a particular degree of freedom. The desired response is a transition from the initial vibrating condition to a non-vibrating condition. The algorithm can also be used to modify the input function to correct for system disturbances while the input function is already being applied to the system. The algorithm is demostrated in a simulation of a simply supported beam controlled by a torque actuator at one end of the beam. The finite element method is used to discretize the equations of motion of the beam.
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Azyazov, V. N., P. A. Mikheyev et M. C. Heaven. « On the O2(a1Δ) quenching by vibrationally excited ozone ». Dans 18th International Symposium on Gas Flow & Chemical Lasers & High Power Lasers, sous la direction de Tanja Dreischuh, Petar A. Atanasov et Nikola V. Sabotinov. SPIE, 2010. http://dx.doi.org/10.1117/12.880043.

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Nagasawa, Yutaka, Arkadiy P. Yartsev, Keisuke Tominaga et Keitaro Yoshihara. « Chemical Substitution and Deuterium Isotope Effects on Ultrafast Intermolecular Electron Transfer : Possible Role of Molecular Vibrations ». Dans International Conference on Ultrafast Phenomena. Washington, D.C. : Optica Publishing Group, 1994. http://dx.doi.org/10.1364/up.1994.fa.3.

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We have observed ultrafast non-exponential fluorescence quenching of 7-aminocoumarin dyes in electron donating solvents by means of femtosecond fluorescence up-conversion technique [1]. We regarded this fluorescence quenching as an ultrafast intermolecular electron transfer (ET) from the solvent to the excited dye. When the carbon chain on the amino group becomes longer, the rate of ET becomes slower, and when the amino group is fixed by hexagonal carbon ring, it becomes the slowest. Some of the fast reactions occur much faster than the diffusive solvent relaxation process. The fastest reaction with a time constant of ~200 fs was observed for coumarin 151 (C151) in N,N-dimethylaniline (DMA). In such a case, some dynamics faster than diffusive orientational polarization of the solvent is required to induce the reaction.
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10

Alba-Florest, Rocio, et Enrique Barbieri. « Real-time Infinite Horizon Linear-Quadratic Tracking Controller for Vibration Quenching in Flexible Beams ». Dans 2006 IEEE International Conference on Systems, Man and Cybernetics. IEEE, 2006. http://dx.doi.org/10.1109/icsmc.2006.384355.

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Rapports d'organisations sur le sujet "Vibrational quenching"

1

Twiddy, Norman. Vibrationally Excited Ions : Quenching, Reaction and Lifetimes. Fort Belvoir, VA : Defense Technical Information Center, janvier 1989. http://dx.doi.org/10.21236/ada208503.

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