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Littérature scientifique sur le sujet « Electrons dynamic »

Auteur : Grafiati

Publié le 1 avril 2023

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Articles de revues sur le sujet "Electrons dynamic"

Egorov, Vladimir V. « Dynamic Symmetry in Dozy-Chaos Mechanics ». Symmetry 12, n^o 11 (11 novembre 2020) : 1856. http://dx.doi.org/10.3390/sym12111856.

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All kinds of dynamic symmetries in dozy-chaos (quantum-classical) mechanics (Egorov, V.V. Challenges 2020, 11, 16; Egorov, V.V. Heliyon Physics 2019, 5, e02579), which takes into account the chaotic dynamics of the joint electron-nuclear motion in the transient state of molecular “quantum” transitions, are discussed. The reason for the emergence of chaotic dynamics is associated with a certain new property of electrons, consisting in the provocation of chaos (dozy chaos) in a transient state, which appears in them as a result of the binding of atoms by electrons into molecules and condensed matter and which provides the possibility of reorganizing a very heavy nuclear subsystem as a result of transitions of light electrons. Formally, dozy chaos is introduced into the theory of molecular “quantum” transitions to eliminate the significant singularity in the transition rates, which is present in the theory when it goes beyond the Born–Oppenheimer adiabatic approximation and the Franck–Condon principle. Dozy chaos is introduced by replacing the infinitesimal imaginary addition in the energy denominator of the full Green’s function of the electron-nuclear system with a finite value, which is called the dozy-chaos energy γ. The result for the transition-rate constant does not change when the sign of γ is changed. Other dynamic symmetries appearing in theory are associated with the emergence of dynamic organization in electronic-vibrational transitions, in particular with the emergence of an electron-nuclear-reorganization resonance (the so-called Egorov resonance) and its antisymmetric (chaotic) “twin”, with direct and reverse transitions, as well as with different values of the electron–phonon interaction in the initial and final states of the system. All these dynamic symmetries are investigated using the simplest example of quantum-classical mechanics, namely, the example of quantum-classical mechanics of elementary electron-charge transfers in condensed media.

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Douis, S., et M. T. Meftah. « Correlation function and electronic spectral line broadening in relativistic plasmas ». Serbian Astronomical Journal, n^o 186 (2013) : 15–23. http://dx.doi.org/10.2298/saj130218002d.

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The electrons dynamics and the time autocorrelation function Cee(t) for the total electric microfield of the electrons on positive charge impurity embedded in a plasma are considered when the relativistic dynamic of the electrons is taken into account. We have, at first, built the effective potential governing the electrons dynamics. This potential obeys a nonlinear integral equation that we have solved numerically. Regarding the electron broadening of the line in plasma, we have found that when the plasma parameters change, the amplitude of the collision operator changes in the same way as the time integral of Cee(t). The electron-impurity interaction is taken at first time as screened Deutsh interaction and at the second time as Kelbg interaction. Comparisons of all interesting quantities are made with respect to the previous interactions as well as between classical and relativistic dynamics of electrons.

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Yang, Ciann-Dong, et Shiang-Yi Han. « Orbital and Spin Dynamics of Electron’s States Transition in Hydrogen Atom Driven by Electric Field ». Photonics 9, n^o 9 (2 septembre 2022) : 634. http://dx.doi.org/10.3390/photonics9090634.

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State transition in the multiple-levels system has the great potential applications in the quantum technology. In this article we employ a deterministic approach in complex space to analyze the dynamics of the 1s–2p electron transition in the hydrogen atom. The electron’s spin motion is embodied in the framework of quantum Hamilton mechanics that allows us to examine the transition dynamics more precisely. The transition is driven by an oscillating electric field in the z-direction. The electron’s transition process can be visualized by monitoring its motion in the complex space. The quantum potential and the total energy proposed in this paper provide new indices to observe the dynamic changes of electrons in the transition process.

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Brange, Fredrik, Adrian Schmidt, Johannes C. Bayer, Timo Wagner, Christian Flindt et Rolf J. Haug. « Controlled emission time statistics of a dynamic single-electron transistor ». Science Advances 7, n^o 2 (janvier 2021) : eabe0793. http://dx.doi.org/10.1126/sciadv.abe0793.

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Quantum technologies involving qubit measurements based on electronic interferometers rely critically on accurate single-particle emission. However, achieving precisely timed operations requires exquisite control of the single-particle sources in the time domain. Here, we demonstrate accurate control of the emission time statistics of a dynamic single-electron transistor by measuring the waiting times between emitted electrons. By ramping up the modulation frequency, we controllably drive the system through a crossover from adiabatic to nonadiabatic dynamics, which we visualize by measuring the temporal fluctuations at the single-electron level and explain using detailed theory. Our work paves the way for future technologies based on the ability to control, transmit, and detect single quanta of charge or heat in the form of electrons, photons, or phonons.

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Mirzanejhad, S., J. Babaei et R. Nasrollahpour. « Electron sheath dynamic in the laser–foil interaction ». Laser and Particle Beams 34, n^o 3 (20 juin 2016) : 440–46. http://dx.doi.org/10.1017/s0263034616000331.

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AbstractIn the interaction of ultra-short and ultra-intense high contrast laser pulse with a dense foil, accelerating electron sheath is formed. The dynamic of this sheath is obtained according to the ponderomotive force of the laser pulse and restoring electrostatic force of the stationary heavy ions. In the transient dynamics, maximum electron sheath displacement is obtained for different interaction parameters. This maximum displacement has an important effect in the explanation of the electron blow out condition. It is shown numerically that the electron sheath maximum displacement increases with increasing laser pulse amplitude or decreasing its rise time, or by decreasing plasma electron density. Recently, backward MeV acceleration of electrons in the interaction of intense laser pulse with solid targets was observed. The ponderomotive force of the compressed reflected laser pulse includes in our formalism and is used for explanation of the electron's backward acceleration. The threshold values of the interaction parameters for the occurrence of this phenomenon are considered. The electron blow out condition and backward acceleration are accompanied with numerical modeling and 1D3V, particle-in-cell simulation code.

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ZHANG, S. Y., Y. K. HO, Z. CHEN, Y. J. XIE, Z. YAN et J. J. XU. « DYNAMIC TRAJECTORIES OF RELATIVISTIC ELECTRONS INJECTED INTO TIGHTLY-FOCUSED INTENSE LASER FIELDS ». Journal of Nonlinear Optical Physics & ; Materials 13, n^o 01 (mars 2004) : 103–12. http://dx.doi.org/10.1142/s0218863504001785.

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Dynamic trajectories of relativistic electrons injected into tightly focused ultra-intense laser field have been investigated. In addition to the previously-reported CAS (Capture and Acceleration Scenario) and IS (Inelastic Scattering) trajectories, a new kind of nonlinear electron trajectory is found when the beam waist radius w0 is small enough (kw0≤30, k is the wave number) and incident angle is small. We shall call it PARM (Penetrate into Axial Region and Move). The basic feature of PARM trajectory shows the strong diffraction effect of a tightly-focused laser field. Part of the incident electrons that experience the strong transversal force from the diffraction edge field as they travel toward the beam waist will follow the PARM trajectory. This force can push the electrons toward the beam center. Thus unlike the CAS and IS electrons, the PARM electrons will move along the region near the beam axis. We also found some of the PARM electrons can gain energy from the field. The conditions for PARM electrons to appear were examined and are presented here. The implication of the presence of PARM to the planned experimental test of the CAS scheme is addressed.

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Ryzhii, Maxim, Taiichi Otsuji, Victor Ryzhii, Vladimir Mitin, Michael S. Shur, Georgy Fedorov et Vladimir Leiman. « Dynamic Conductivity and Two-Dimensional Plasmons in Lateral CNT Networks ». International Journal of High Speed Electronics and Systems 26, n^o 01n02 (17 février 2017) : 1740004. http://dx.doi.org/10.1142/s0129156417400043.

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We study theoretically the carrier transport and the plasmonic phenomena in the gated structures with dense lateral carbon nanotube (CNT) networks (CNT “felt”) placed between the highly-conducting slot line electrodes. The CNT networks under consideration consist of a mixture of semiconducting and metallic CNTs. We find the dispersion relations for the two-dimensional plasmons, associated with the collective self-consisted motion of electrons in the individual CNTs, propagating along the electrodes as functions of the net electron density (gate voltage), relative fraction of the semiconducting and metallic CNTs, and the spacing between the electrodes. In a wide range of parameters, the characteristic plasmonic frequencies can fall in the terahertz (THz) range. The structures with lateral CNT networks can used in different THz devices.

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Wili, Nino, Jan Henrik Ardenkjær-Larsen et Gunnar Jeschke. « Reverse dynamic nuclear polarisation for indirect detection of nuclear spins close to unpaired electrons ». Magnetic Resonance 3, n^o 2 (10 août 2022) : 161–68. http://dx.doi.org/10.5194/mr-3-161-2022.

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Abstract. Polarisation transfer schemes and indirect detection are central to magnetic resonance. Using the trityl radical OX063 and a pulse electron paramagnetic resonance spectrometer operating in the Q-band (35 GHz, 1.2 T), we show here that it is possible to use pulsed dynamic nuclear polarisation (DNP) to transfer polarisation from electrons to protons and back. The latter is achieved by first saturating the electrons and then simply using a reverse DNP step. A variable mixing time between DNP and reverse DNP allows us to investigate the decay of polarisation on protons in the vicinity of the electrons. We qualitatively investigate the influence of solvent deuteration, temperature, and electron concentration. We expect reverse DNP to be useful in the investigation of nuclear spin diffusion and envisage its use in electron–nuclear double-resonance (ENDOR) experiments.

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Issanova, M. K., S. K. Kodanova, T. S. Ramazanov, N. Kh Bastykova, Zh A. Moldabekov et C. V. Meister. « Classical scattering and stopping power in dense plasmas : the effect of diffraction and dynamic screening ». Laser and Particle Beams 34, n^o 3 (27 juin 2016) : 457–66. http://dx.doi.org/10.1017/s026303461600032x.

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AbstractIn the present work, classical electron–ion scattering, Coulomb logarithm, and stopping power are studied taking into account the quantum mechanical diffraction effect and the dynamic screening effect separately and together. The inclusion of the quantum diffraction effect is realized at the same level as the well-known first-order gradient correction in the extended Thomas–Fermi theory. In order to take the effect of dynamic screening into account, the model suggested by Grabowski et al. in 2013 is used. Scattering as well as stopping power of the external electron (ion) beam by plasma ions (electrons) and scattering of the plasma's own electrons (ions) by plasma ions (electrons) are considered differently. In the first case, it is found that in the limit of the non-ideal plasma with a plasma parameter Γ → 1, the effects of quantum diffraction and dynamic screening partially compensate each other. In the second case, the dynamic screening enlarges scattering cross-section, Coulomb logarithm, and stopping power, whereas the quantum diffraction reduces their values. Comparisons with the results of other theoretical methods and computer simulations indicate that the model used in this work gives a good description of the stopping power for projectile velocities $v\,{\rm \lesssim}\, 1.5 v_{{\rm th}}$, where vth is the thermal velocity of the plasma electrons.

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Yasuda, Hirotsugu, Loic Ledernez, Fethi Olcaytug et Gerald Urban. « Electron dynamics of low-pressure deposition plasma ». Pure and Applied Chemistry 80, n^o 9 (1 janvier 2008) : 1883–92. http://dx.doi.org/10.1351/pac200880091883.

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When the electric field in the dark gas phase reaches the threshold value, an electron avalanche (breakdown) occurs, which causes dissociation of organic molecules, excitation of chemically reactive molecular gas, and/or ionization of atomic gas, depending on the type of gas involved. The principles that govern these electron-impact reactions are collectively described by the term "electron dynamics". The electron-impact dissociation of organic molecules is the key factor for the deposition plasma. The implications of the interfacial avalanche of the primary electrons on the deposition plasma and also other plasma processes are discussed. The system dependency of low-pressure plasma deposition processes is an extremely important factor that should be reckoned, because the electron dynamic reactions are highly dependent on every aspect of the reaction system. The secondary electron emission from the cathode is a misinterpretation of the interfacial electron avalanche of the primary electrons described in this paper.

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Thèses sur le sujet "Electrons dynamic"

Licsandru, Erol-Dan. « Dynamic systems for the translocation of water, ions or electrons ». Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS213/document.

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L'objectif de ce travail concerne le transport à travers des membranes lipidiques de l'eau et d' ions par des canaux artificiels auto-assembles, et le design des nano-contacts organiques auto-assembles pour des applications macro échelle : biocathodes. La première partie est concentre sur le transport de l'eau et d'ions à travers des membranes bicouches. L'objectif est la réplication de la fonction des protéines naturelles, utilisant des composées ureido-heterocycle. L'influence de la composition des espèces est évaluée par rapport à leur structure supramoléculaire et la liaison entre elle et son activité. Le premier chapitre traite le transport des ions travers les bicouches lipidiques générées en grandes vésicules unilamellaires (LUVs), en termes d'activité et sélectivité dépendants de la structure de composées. Le deuxième chapitre présente le transport de l'eau à travers des systèmes LUV. Une approche combinée a été utilisée pour évaluer l'activité des canaux, par les placer a l'extérieur des liposomes comme même directement dans le couche lipidique. Finalement le transport de protons a été évalué pour ces structures, relevant des canaux de protons très efficients. Le troisième chapitre aborde une approche interdisciplinaire. Certaines triarylamines (TAAs) ont la propriété à former des nano fibrilles sur l'irradiation par la formation des radicaux-cations. Ceci représente une voie de conduction directionnelle pour électrons avec une conductivité similaire aux métaux. Les fibrilles, quelles déchire en absence de lumière, offrent des possibilités intéressants au rapport de nano-échelle contacts électriques. Une matrice de silice mésoporeuse a été utilisée pour confiner les TAAs . La nouveauté de cette approche c'est que le système présent des conductivités à travers les nano fils de TAA, alors que la matrice de silice est isolante. Ce dispositif a été caractérisé et utilisé comme un bio cathode contenant l'enzyme laccase et ont été testes pour prouver le role des nano contacts TAAs comme les seuls fournisseurs d'électrons pour l'enzyme
The objective of this work is the study of the transport through lipid membranes of water and ions using self-assembled artificial channel structures and the design of nano sized self-assembled organic contacts for macroscale applications: biocathodes.The first part focuses on the transport through membrane bilayers. The objective is to replicate the function of naturally occurring proteins using ureido-hetreocycle compounds. The influence of species composition is assessed versus the supramolecular structure it generates and the link between it and activity. The first chapter treats the transport of ions through the lipid bilayers of large unilamellar vesicles (LUVs), in terms of total activity and selectivity vs. the structure of compounds. The second chapter refers to the transport of water on LUV systems. Here, a combined approach was used in evaluating the channels' activity, by placing them both on the outside of the liposomes but also directly in the lipid layer. Finally the protons transport of these structures was assessed reveling very efficient proton channels. The third chapter has an interdisciplinary approach combining several topics. The triaryl amines (TAAs) have to propriety of forming self-assembled nano sized fibrils when irradiated by the generation of cation-radicals. These present a directional electronic conduction pathway and are reported to display metal-like conductivity. These fibrils, which unravel in the absence of light, provide interesting possibilities as organic nano scale electrical contacts. A matrix of mesoporous silica was created via electrodeposition in order to enclose the TAAs in a confined medium. The novelty of the approach is that the system only has electron conductivity trough the TAAs nano wires while the silica mass is insulating. The resulting device's proprieties were characterized and further it was used as a bio cathode. The biocathodes containing the enzyme Laccase were then tested to prove the functioning of the matrix of nano contacts as the only providers of electrons to the enzyme

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Iyer, Venkatraman 1967. « Discretized path integral molecular dynamic simulations with quantum exchange of two electrons in molten potassium chloride ». Thesis, The University of Arizona, 1992. http://hdl.handle.net/10150/278142.

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This study presents the use of Feynman's Quantum Path Integral (QPI) approach in the Molecular Dynamic Simulation of two electrons in molten KCl. In this research, we have successfully implemented an original technique to tackle the questions of spin dependent quantum exchange phenomenon between two electrons. It was found that two electrons with antiparallel spins form a stable bipolaronic complex and those with parallel spins repel each other and form two dissociated or singlet states. Calculations of the average energies compare well with previous computational findings by Selloni et al. who used a direct integration of the time dependent Schrodinger equation. The radial distribution function illustrated clearly that the triplet state nests itself among the cations, namely K+. The electron-electron separation distance was found to be ∼3.5 A for the triplet state and the singlet case showed the electrons being repelled as far as possible; namely half the size of the simulation cell ∼7 A.

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CORNIER-QUIQUANDON, MARIANNNE. « Theorie dynamique de la diffraction des electrons rapides par les cristaux et quasicristaux ». Paris 6, 1988. http://www.theses.fr/1988PA066167.

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Description de la diffraction des electrons par les solides ordonnes a longue distance. Le formalisme necessite d'exprimer l'hamiltonien de diffraction sur une base discrete d'ondes planes. Le spectre des etats propres de l'hamiltonien de diffraction est dense non uniforme. Les calculs dynamiques peuvent donc etre effectues en echantillonant le spectre par valeurs discretes. Application de la methode a la simulation des images de microscopie electronique en haute resolution sur une phase icosaedrique en utilisant la description 6d de la structure. Interpretation des resultats experimentaux par la representation 6d

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Lanier, Steven t. « Dynamic Screening via Intense Laser Radiation and Its Effects on Bulk and Surface Plasma Dispersion Relations ». Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc1011758/.

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Recent experimentation with excitation of surface plasmons on a gold film in the Kretschmann configuration have shown what appears to be a superconductive effect. Researchers claimed to see the existence of electron pairing during scattering as well as magnetic field repulsion while twisting the polarization of the laser. In an attempt to explain this, they pointed to a combination of electron-electron scattering in external fields as well as dynamic screening via intense laser radiation. This paper expands upon the latter, taking a look at the properties of a dynamic polarization function, its effects on bulk and surface plasmon dispersion relations, and its various consequences.

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Schäfer-Bung, Boris, et Mathias Nest. « Correlated dynamics of electrons with reduced two-electron density matrices ». Universität Potsdam, 2008. http://opus.kobv.de/ubp/volltexte/2010/4177/.

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We present an approach to the correlated dynamics of many-electron systems. We show, that the twoelectron reduced density matrix (2RDM) can provide a suitable description of the real time evolution of a system. To achieve this, the hierarchy of equations of motion must be truncated in a practical way. Also, the computational effort, given that the 2RDM is represented by products of two-electron determinants, is discussed, and numerical model calculations are presented.

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Cao, Hui. « Dynamic Effects on Electron Transport in Molecular Electronic Devices ». Doctoral thesis, KTH, Teoretisk kemi, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-12676.

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HTML clipboardIn this thesis, dynamic effects on electron transport in molecular electronic devices are presented. Special attention is paid to the dynamics of atomic motions of bridged molecules, thermal motions of surrounding solvents, and many-body electron correlations in molecular junctions. In the framework of single-body Green’s function, the effect of nuclear motions on electron transport in molecular junctions is introduced on the basis of Born-Oppenheimer approximation. Contributions to electron transport from electron-vibration coupling are investigated from the second derivative of current-voltage characteristics, in which each peak is corresponding to a normal mode of the vibration. The inelastic-tunneling spectrum is thus a useful tool in probing the molecular conformations in molecular junctions. By taking account of the many-body interaction between electrons in the scattering region, both time-independent and time-dependent many-body Green’s function formula based on timedependent density functional theory have been developed, in which the concept of state of the system is used to provide insight into the correlation effect on electron transport in molecular devices. An effective approach that combines molecular dynamics simulations and first principles calculations has also been developed to study the statistical behavior of electron transport in electro-chemically gated molecular junctions. The effect of thermal motions of polar water molecules on electron transport at different temperatures has been found to be closely related to the temperature-dependent dynamical hydrogen bond network.
QC20100630

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Blidberg, Andreas. « Iron Based Materials for Positive Electrodes in Li-ion Batteries : Electrode Dynamics, Electronic Changes, Structural Transformations ». Doctoral thesis, Uppsala universitet, Strukturkemi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-317014.

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Li-ion battery technology is currently the most efficient form of electrochemical energy storage. The commercialization of Li-ion batteries in the early 1990’s revolutionized the portable electronics market, but further improvements are necessary for applications in electric vehicles and load levelling of the electric grid. In this thesis, three new iron based electrode materials for positive electrodes in Li-ion batteries were investigated. Utilizing the redox activity of iron is beneficial over other transition metals due to its abundance in the Earth’s crust. The condensed phosphate Li2FeP2O7 together with two different LiFeSO4F crystal structures that were studied herein each have their own advantageous, challenges, and scientific questions, and the combined insights gained from the different materials expand the current understanding of Li-ion battery electrodes. The surface reaction kinetics of all three compounds was evaluated by coating them with a conductive polymer layer consisting of poly(3,4-ethylenedioxythiophene), PEDOT. Both LiFeSO4F polymorphs showed reduced polarization and increased charge storage capacity upon PEDOT coating, showing the importance of controlling the surface kinetics for this class of compounds. In contrast, the electrochemical performance of PEDOT coated Li2FeP2O7 was at best unchanged. The differences highlight that different rate limiting steps prevail for different Li-ion insertion materials. In addition to the electrochemical properties of the new iron based energy storage materials, also their underlying material properties were investigated. For tavorite LiFeSO4F, different reaction pathways were identified by in operando XRD evaluation during charge and discharge. Furthermore, ligand involvement in the redox process was evaluated, and although most of the charge compensation was centered on the iron sites, the sulfate group also played a role in the oxidation of tavorite LiFeSO4F. In triplite LiFeSO4F and Li2FeP2O7, a redistribution of lithium and iron atoms was observed in the crystal structure during electrochemical cycling. For Li2FeP2O7, and increased randomization of metal ions occurred, which is similar to what has been reported for other iron phosphates and silicates. In contrast, triplite LiFeSO4F showed an increased ordering of lithium and iron atoms. An electrochemically induced ordering has previously not been reported upon electrochemical cycling for iron based Li-ion insertion materials, and was beneficial for the charge storage capacity of the material.

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Grumbling, Emily Rose. « Electronic Structure, Intermolecular Interactions and Electron Emission Dynamics via Anion Photoelectron Imaging ». Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/195933.

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This dissertation explores the use of anion photoelectron imaging to interrogate electronic dynamics in small chemical systems with an emphasis on photoelectron angular distributions. Experimental ion generation, mass selection, laser photodetachment and photoelectron imaging were performed in a negative-ion photoelectron imaging spectrometer described in detail. Results for photodetachment from the simplest anion, H⁻, are used to illustrate fundamental principles of quantum mechanics and provide basic insight into the physics behind photoelectron imaging from a pedagogical perspective. This perspective is expanded by introducing imaging results for additional, representative atomic and small molecular anions (O⁻, NH₂⁻ and N₃⁻) obtained at multiple photon energies to address the energy-dependence of photoelectron angular distributions both conceptually and semi-quantitatively in terms of interfering partial photoelectron waves. The effect of solvation on several of these species (H⁻, O⁻, and NH₂⁻) is addressed in photoelectron imaging of several series of cluster anions. The 532 and 355 nm energy spectra for H⁻(NH₃)n and NH₂⁻(NH₃)n (n = 0-5) reveal that these species are accurately described as the core anion solute stabilized electrostatically by n loosely coordinated NH3 molecules. The photoelectron angular distributions for solvated H⁻ deviate strongly from those predicted for unsolvated H⁻ as the electron kinetic energy approaches zero, indicating a shift in the partial-wave balance consistent with both solvation-induced perturbation (and symmetry-breaking) of the H⁻ parent orbital and photoelectron-solvent scattering. The photoelectron energy spectra obtained for the cluster series [O(N₂O)n]⁻ and [NO(N₂O)n]⁻ indicate the presence of multiple structural isomers of the anion cores, the former displaying sharp core-switching at n = 4, the latter isomer coexistence over the entire range studied. The photoelectron angular distributions for detachment from the O⁻(N₂O)n and NO⁻(N₂O)n isomers deviate strongly from those expected for bare O⁻ and NO⁻, respectively, in the region of an anionic shape resonance of N₂O, suggesting resonant photoelectron-solvent scattering. Partial-wave models for two-centered photoelectron interference in photodetachment from dissociating I₂⁻ is presented and discussed in the context of previous results. New time-resolved photoelectron imaging results for I₂⁻, for both parallel and perpendicular pump and probe beam polarizations, are presented and briefly discussed. Finally, new ideas and directions are proposed.

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Okhrimenko, Albert N. « ULTRAFAST EXCITED STATE RELAXATION DYNAMICS OF ELECTRON DEFICIENT PORPHYRINS : CONFORMATIONAL AND ELECTRONIC FACTORS ». Connect to this title online, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=bgsu1126888140.

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Biswas, Somnath. « Watching Electrons Move in Metal Oxide Catalysts : Probing Ultrafast Electron Dynamics by Femtosecond Extreme Ultraviolet Reflection-Absorption Spectroscopy ». The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1586375150350782.

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Livres sur le sujet "Electrons dynamic"

Electrode dynamics. Oxford : Oxford University Press, 1996.

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1939-, Plattner Helmut, dir. Electron microscopy of subcellular dynamics. Boca Raton, Fla : CRC Press, 1989.

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1939-, Plattner Helmut, dir. Electron microscopy of subcellular dynamics. Boca Raton, Fla : CRC Press, 1989.

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D, Tóth Klára Ph, et Pungor E, dir. Dynamic characteristics of ion-selective electrodes. Boca Raton, Fla : CRC Press, 1988.

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Designing dynamic circuit response. Raleigh, NC : SciTech Pub., 2010.

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H, McGuire J. Electron correlation dynamics in atomic collisions. Cambridge : Cambridge University Press, 1997.

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Mladenov, Valeri M., et Plamen Ch Ivanov, dir. Nonlinear Dynamics of Electronic Systems. Cham : Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-08672-9.

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Witte, Johan F. Dynamic Offset Compensated CMOS Amplifiers. Dordrecht : Springer Netherlands, 2009.

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Lenz, Annika. Dynamic Decision Support for Electronic Requirements Negotiations. Wiesbaden : Springer Fachmedien Wiesbaden, 2020. http://dx.doi.org/10.1007/978-3-658-31175-9.

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1930-, Tsuchida E., dir. Macromolecular complexes : Dynamic interactions and electronic processes. New York, N.Y : VCH Publishers, 1991.

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Chapitres de livres sur le sujet "Electrons dynamic"

Demel, T., D. Heitmann, P. Grambow et K. Ploog. « Dynamic Excitations of Quantum Dots in AIGaAs-GaAs ». Dans Localization and Confinement of Electrons in Semiconductors, 51–59. Berlin, Heidelberg : Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-84272-6_6.

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Liu, Wenjian, et Mark R. Hoffmann. « SDS : the ‘static–dynamic–static’ framework for strongly correlated electrons ». Dans Highlights in Theoretical Chemistry, 141–52. Berlin, Heidelberg : Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-662-48148-6_13.

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Kotthaus, Jörg P. « Static and Dynamic Conductivity of Inversion Electrons in Lateral Superlattices ». Dans Electronic Properties of Multilayers and Low-Dimensional Semiconductor Structures, 425–26. Boston, MA : Springer US, 1990. http://dx.doi.org/10.1007/978-1-4684-7412-1_24.

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Barkay, Zahava. « Dynamic Study of Nanodroplet Nucleation and Growth Using Transmitted Electrons in ESEM ». Dans Lecture Notes in Nanoscale Science and Technology, 51–72. New York, NY : Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-9472-0_3.

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Hubbard, Joseph B. « Dynamic Processes in Liquids and Selected Topics Related to the Dynamics of Ions and Electrons in Liquids ». Dans The Liquid State and Its Electrical Properties, 47–88. Boston, MA : Springer US, 1988. http://dx.doi.org/10.1007/978-1-4684-8023-8_3.

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Song, Yangyang, Yang Guo, Yibo Lei, Ning Zhang et Wenjian Liu. « The Static–Dynamic–Static Family of Methods for Strongly Correlated Electrons : Methodology and Benchmarking ». Dans Topics in Current Chemistry Collections, 181–236. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-07658-9_7.

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Brette, Romain, Zuzanna Piwkowska, Cyril Monier, José Francisco, Gómez González, Yves Frégnac, Thierry Bal et Alain Destexhe. « Dynamic Clamp with High-Resistance Electrodes Using Active Electrode Compensation In Vitro and In Vivo ». Dans Dynamic-Clamp, 347–82. New York, NY : Springer US, 2009. http://dx.doi.org/10.1007/978-0-387-89279-5_16.

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Goddard, William A. « Electron Dynamics and Electron Transfer ». Dans Computational Materials, Chemistry, and Biochemistry : From Bold Initiatives to the Last Mile, 1055–62. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-18778-1_44.

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Lin, Fanglei. « Electron Polarization ». Dans Polarized Beam Dynamics and Instrumentation in Particle Accelerators, 155–81. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-16715-7_6.

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AbstractThis chapter focuses on the introduction and discussion of electron polarization. In addition to the gyromagnetic ratio, the most different character of electrons compared to protons is that electrons radiate electromagnetic energy in a circular accelerator. A very small correction has to be applied to the electron spin flip to account for the synchrotron radiation. The different instantaneous spin flip probabilities, up to down and down to up, can build up the electron beam polarization state. However, mostly synchrotron radiation tends to disturb the electron orbital motion that is eventually balanced by the radiation damping along an equilibrium orbit. The electron spin motion is described by the modified Thomas-BMT equation with the radiative spin transition term included. Detail of the electron (de)polarization phenomena is described in this chapter. The lecture is extracted from various early theoretical papers, lectures, thesis and presentations (Lee, Accelerator Physics. World Scientific Publishing, 1999; Buon and Koutchouk, Polarization of Electron and Proton Beams. CERN-SL-94-80-AP, 1994; Montague, Phys. Rep. 113(1):1–96, 1984; Lee, Spin Dynamics and Snakes in Synchrotrons. World Scientific Publishing, 1997; Barber and Ripken, Handbook of Accelerator Physics and Engineering, 1st edn. World Scientific Publishing, 2006; Barber, An Introduction to Spin Polarisation in Accelerators and Storage Rings. Cockcroft Institute Academic Training Winter Term, 2014; Mane, Nucl. Instr. Methods Phys. Res. A 292:52–74, 1990; Berglund, Spin-Orbit Maps and Electron Spin Dynamics for the Luminosity Upgrade Project at HERA. DESY-THESIS-2001-044, 2001; Electron-Ion Collider Conceptual Design Report, 2020).

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Schächter, Levi. « Elementary Electron Dynamics ». Dans Particle Acceleration and Detection, 93–167. Berlin, Heidelberg : Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-19848-9_3.

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Actes de conférences sur le sujet "Electrons dynamic"

Mao, Yao-Ting, David Auslander, David Pankow et John Sample. « Estimating Angular Velocity, Attitude Orientation With Controller Design for Three Units CubeSat ». Dans ASME 2014 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/dscc2014-5895.

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CINEMA (CubeSat for Ions, Neutrals, Electrons and MAgneticfields) will image energetic neutral atoms (ENAs) in the magnetosphere, and make measurements of electrons, ions, and magnetic fields at high latitudes. To satisfy the mission requirements, the three unit cubesat was designed. The spin axis needs to be in the ecliptic normal and the spin rate needs to be 4 rpm. The only power source for CINEMA is the solar panels. External torques are generated by an orthogonal pair of coils acting with the earths magnetic field. This paper provides the control strategy, given the limited power and available sensors, to optimize the convergence of the spin and attitude control.

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Kalinski, Matt. « Dynamic Ferroelectricity of Trojan Electrons on Face-Centered Square Lattice ». Dans Frontiers in Optics. Washington, D.C. : OSA, 2016. http://dx.doi.org/10.1364/fio.2016.jw4a.187.

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Motte-Tollet, F., M. J. Hubin-Franskin, J. Delwiche et P. Morin. « Relaxation processes following excitation and ionization of the iodine 4d and bromine 3d core electrons in C2H5I and C2H4IBr ». Dans Synchrotron radiation and dynamic phenomena. AIP, 1992. http://dx.doi.org/10.1063/1.42546.

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Kalinski, Matt. « Dynamic Ferroelectricity of Trojan Electrons on Parallel Regular 2-dimensional Lattices ». Dans Frontiers in Optics. Washington, D.C. : OSA, 2018. http://dx.doi.org/10.1364/fio.2018.jtu2a.10.

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Yu, Meng-Ju, Peter Moroshkin et Jimmy Xu. « Dynamic Symmetry-Breaking and Transverse Photo Response ». Dans CLEO : Applications and Technology. Washington, D.C. : Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleo_at.2022.jw4a.6.

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A transverse photoresponse to a dynamic symmetry-breaking by an external current is investigated in a structurally symmetric plasmonic system. The results indicate optical angular momentum transfer to free electrons via a spin-momentum locking mechanism availed in surface plasmon polaritons.

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Young, Jeffrey F., et Paul J. Kelly. « Coulomb scattering of hot electrons with electron-hole plasmas in GaAs : quantitative effects of dynamic screening (Invited Paper) ». Dans Semiconductors '92, sous la direction de David Yevick. SPIE, 1992. http://dx.doi.org/10.1117/12.60486.

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Kalinski, Matt. « Dynamic Ferroelectricity of Trojan Electrons on Hexagonal Face-Centered 3-Triangular Lattice ». Dans Frontiers in Optics. Washington, D.C. : OSA, 2017. http://dx.doi.org/10.1364/fio.2017.jtu3a.116.

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Jutamulia, Suganda, George M. Stroti, William Seiderman et Joseph Lindmayer. « Hopfield neural network using electron-trapping materials ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oam.1990.mvv8.

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The electron-trapping (ET) materials are optical storage materials developed by Quantex. When ET materials are exposed to visible light (e.g., 488 nm), electrons from the ground state are excited and then captured by thermally stable traps. Subsequent exposure to IR light (e.g., 1064 nm) excites and releases the trapped electrons to the ground state with the emission of orange-to-red light. The ET materials are capable of performing multiplication, addition, and subtraction within a dynamic range covering four orders of magnitude. The orange emission intensity is proportional to the product of the blue write-in intensity and the IR read-out intensity. The addition and subtraction operations are performed by increasing and decreasing the number of trapped electrons. An ET thin film can be used as an optical mask to perform matrix vector multiplication. Furthermore, the ET thin film has an inherent capability for summing, subtracting, and storing optical data, in addition to multiplication. This extra capability, which is not commonly found in spatial light modulators, will be used for the optical formation of an interconnection matrix (prescribed learning).

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Rykaczewski, Konrad, Ben White, Jenna Browning, Andrew D. Marshall et Andrei G. Fedorov. « Dynamic Model of Electron Beam Induced Deposition (EBID) of Residual Hydrocarbons in Electron Microscopy ». Dans ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14955.

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Adsorbed species surface diffusion Electron beam induced deposition (EBID) of residuals carbon can be either a contamination problem or can provide a basis for 3-D nanofabrication and nanoscale metrology. In this process a solid deposit is formed at the point of impact of the electron beam due to the decomposition of residual hydrocarbon species adsorbed on the solid substrate. The first observation of EBID can be traced to miscroscopists who noticed the growth of thin films of carbon while imaging using an electron microscope. The process was referred to as "contamination" because of its adverse effects on the microscope's imaging quality. Later, it has been demonstrated that with appropriate control of the electron beam this problematic contamination can be exploited to deposit three dimensional nanostructures with the spatial resolution down to 10nm. Numerous researchers have experimentally explored various factors influencing EBID growth rate and geometry of the deposit. To date, the most comprehensive theoretical model predicting the shape of the deposit in EBID is due to Silvis-Cividjian[1]. However, this model accounts for electron transport only. A few, fairly rudimentary models have also been developed for mass transport in EBID, but usually limited to rather simplistic treatment of electron transport. To this end, we have developed a comprehensive dynamic model of EBID coupling mass transport, electron transport and scattering, and species decomposition to predict deposition of carbon nano-dots. The simulations predict the local species and electron density distributions, as well as the 3-D profile and the growth rate of the deposit. Since the process occurs in a high vacuum environment surface diffusion is considered as the primary transport mode of surface-adsorbed hydrocarbon precursor. Transport, scattering, and absorption of primary electron as well as secondary electron generation are treated using the Monte Carlo methods. Low energy secondary electrons (SE) are the major contributors to hydrocarbon decomposition due to their energy range matching peak dissociation reaction cross section energies for precursor molecules. The local SE flux at the substrate and at the free surface of the growing deposit is computed using the Fast Secondary Electron (FSE) model. When combined with the total dissociation reaction corssection and the local hydrocarbon surface concentration, this allows us to compute the local deposition rate. The deposition rates are then used to predict the shape profile evolution of the deposit. Simulation results are compared with an AFM imaging of carbon EBID.

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Huanwen, Zhang. « The Elimination of The Dynamic plash in A picosecond streak image Tube ». Dans International Conference on Ultrafast Phenomena. Washington, D.C. : Optica Publishing Group, 1986. http://dx.doi.org/10.1364/up.1986.wd7.

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The cause of producing dynamic flash in a picosecond streak image tube has been analyzed, it has been convinced that the flash is produced by the discharge between the deflector and the anode cone hole in the tube. The material with small reflective coefficient has been chosen as deflectors. The measure has been taken to screen reflected photoelectrons and other stray electrons. The dynamic flash in the tube has been effectively eliminated.

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Rapports d'organisations sur le sujet "Electrons dynamic"

Evtushenko, Pavel. Large dynamic range beam diagnostics and beam dynamics studies for high current electron LINACs. Office of Scientific and Technical Information (OSTI), octobre 2016. http://dx.doi.org/10.2172/1467456.

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Schutt, Timothy C., et Manoj K. Shukla. Computational Investigation on Interactions Between Some Munitions Compounds and Humic Substances. Engineer Research and Development Center (U.S.), février 2021. http://dx.doi.org/10.21079/11681/39703.

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Humic acid substances (HAs) in natural soil and sediment environments effect the retention and degradation of insensitive munitions compounds and legacy high explosives (MCs): DNAN, DNi- NH4+, nMNA, NQ, NTO (neutral and anionic forms), TNT, and RDX.A humic acid model compound has been considered using molecular dynamics, thermodynamic integration, and density functional theory to characterize the munition binding ability, ionization potential, and electron affinity compared to that in the water solution. Humic acids bind most compounds and act as both a sink and source for electrons. Ionization potentials suggest HAs are more susceptible to oxidation than the MCs studied. The electron affinity of HAs are very conformation-dependent and spans the same range as the munition compounds. When HAs and MCs are complexed the HAs tend to radicalize first thus buffering MCs against reductive as well as oxidative attacks.

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Gonzalez, Daniel G. Dynamic Flaps Electronic Scan Antenna. Fort Belvoir, VA : Defense Technical Information Center, janvier 2000. http://dx.doi.org/10.21236/ada389702.

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McNeill, Jason Douglas. Ultrafast dynamics of electrons at interfaces. Office of Scientific and Technical Information (OSTI), mai 1999. http://dx.doi.org/10.2172/8776.

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Ling, Meng-Chieh. Hot electron dynamics in graphene. Office of Scientific and Technical Information (OSTI), janvier 2011. http://dx.doi.org/10.2172/1048505.

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Mark Maroncelli, Nancy Ryan Gray. Electronic Spectroscopy & ; Dynamics. Office of Scientific and Technical Information (OSTI), juin 2010. http://dx.doi.org/10.2172/981408.

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Xiaoyin Guan, Hong Qin, and Nathaniel J. Fisch. Phase-space Dynamics of Runaway Electrons In Tokamaks. Office of Scientific and Technical Information (OSTI), août 2010. http://dx.doi.org/10.2172/988884.

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Caldwell, C. D., A. Menzel et S. P. Frigo. Dynamics of two-electron excitations in helium. Office of Scientific and Technical Information (OSTI), avril 1997. http://dx.doi.org/10.2172/603601.

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Pitthan, Rainer. Space Charge Dynamics of Bright Electron Beams. Office of Scientific and Technical Information (OSTI), mai 2002. http://dx.doi.org/10.2172/799075.

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Reed, B., M. Armstrong, K. Blobaum, N. Browning, A. Burnham, G. Campbell, R. Gee et al. Time Resolved Phase Transitions via Dynamic Transmission Electron Microscopy. Office of Scientific and Technical Information (OSTI), février 2007. http://dx.doi.org/10.2172/902321.

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