Academic literature on the topic 'Classical physics'

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Journal articles on the topic "Classical physics"

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Nolte, David. "Modernizing classical physics." Physics World 32, no. 2 (February 2019): 19. http://dx.doi.org/10.1088/2058-7058/32/2/22.

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Lodato, Giuseppe. "Classical disc physics." New Astronomy Reviews 52, no. 2-5 (June 2008): 21–41. http://dx.doi.org/10.1016/j.newar.2008.04.002.

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Zaytsev, Evgeny Alekseevich. "From pre-classical physics to classical mechanics." Chebyshevskii sbornik 20, no. 2 (2019): 483–92. http://dx.doi.org/10.22405/2226-8383-2019-20-2-483-492.

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Meyer, David A. "Quantum computing classical physics." Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences 360, no. 1792 (March 15, 2002): 395–405. http://dx.doi.org/10.1098/rsta.2001.0936.

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Scott, D. "Engineering and classical physics." International Journal of Hydrogen Energy 25, no. 9 (September 1, 2000): 801–6. http://dx.doi.org/10.1016/s0360-3199(99)00094-4.

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Haque, Asrarul. "Causality in classical physics." Resonance 19, no. 6 (June 2014): 523–37. http://dx.doi.org/10.1007/s12045-014-0056-4.

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Lin, Chris L. "Chirality through classical physics." European Journal of Physics 41, no. 4 (June 16, 2020): 045802. http://dx.doi.org/10.1088/1361-6404/ab895d.

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Longair, Malcolm. "Physics: A classical toolkit." Nature 550, no. 7675 (October 2017): 185–86. http://dx.doi.org/10.1038/550185a.

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Prytz, Kjell Ake. "MEISSNER EFFECT IN CLASSICAL PHYSICS." Progress In Electromagnetics Research M 64 (2018): 1–7. http://dx.doi.org/10.2528/pierm17092702.

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Parker, E. N. "Solar Activity and Classical Physics." Chinese Journal of Astronomy and Astrophysics 1, no. 2 (April 2001): 99–124. http://dx.doi.org/10.1088/1009-9271/1/2/99.

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Dissertations / Theses on the topic "Classical physics"

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Chambers, Chris M. "Classical aspects of black hole physics." Thesis, University of Newcastle Upon Tyne, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294892.

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Beamond, Eleanor. "Quantum and classical localisation." Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249185.

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Di, Criscienzo Roberto. "Semi-classical aspect of black hole physics." Doctoral thesis, Università degli studi di Trento, 2011. https://hdl.handle.net/11572/367865.

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Di, Criscienzo Roberto. "Semi-classical aspect of black hole physics." Doctoral thesis, University of Trento, 2011. http://eprints-phd.biblio.unitn.it/627/1/PhD_v2.pdf.

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Vrinceanu, Daniel. "Quantal-classical correspondence in atomic collisions." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/28035.

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Sylvester, Igor Andrade. "Efficient classical simulation of spin networks." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/36112.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2006.
Includes bibliographical references (p. 45).
In general, quantum systems are believed to be exponentially hard to simulate using classical computers. It is in these hard cases where we hope to find quantum algorithms that provide speed up over classical algorithms. In the paradigm of quantum adiabatic computation, instances of spin networks with 2-local interactions could hopefully efficiently compute certain problems in NP-complete. Thus, we are interested in the adiabatic evolution of spin networks. There are analytical solutions to specific Hamiltonians for 1D spin chains. However, analytical solutions to networks of higher dimensionality are unknown. The dynamics of Cayley trees (three binary trees connected at the root) at zero temperature are unknown. The running time of the adiabatic evolution of Cayley trees could provide an insight into the dynamics of more complicated spin networks. Matrix Product States (MPS) define a wavefunction anzatz that approximates slightly entangled quantum systems using poly(n) parameters. The MPS representation is exponentially smaller than the exact representation, which involves 0(2n) parameters. The MPS Algorithm evolves states in the MPS representation.
(cont.) We present an extension to the DMRG algorithm that computes an approximation to the adiabatic evolution of Cayley trees with rotationally-symmetric 2-local Hamiltonians in time polynomial in the depth of the tree. This algorithm takes advantage of the symmetry of the Hamiltonian to evolve the state of a Cayley tree exponentially faster than using the standard DMRG algorithm. In this thesis, we study the time-evolution of two local Hamiltonians in a spin chain and a Cayley tree. The numerical results of the modified MPS algorithm can provide an estimate on the entropy of entanglement present in ground states of Cayley trees. Furthermore, the study of the Cayley tree explores the dynamics of fractional-dimensional spin networks.
by Igor Andrade Sylvester.
S.B.
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Rudner, Mark S. (Mark Spencer). "Classical and quantum control in nanosystems." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/45443.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2008.
Includes bibliographical references (p. 189-202).
The central claim of this thesis is that nanoscale devices offer a platform to study and demonstrate new forms of control over both quantum and classical degrees of freedom in solid-state systems. To support this claim, I present a series of theoretical discussions that demonstrate how static and/or time-varying fields can be used to control spin degrees of freedom in GaAs quantum dots. This work is motivated by recent experiments in single and double quantum dots that have demonstrated many interesting phenomena arising from the coupled dynamics of electron and nuclear spins. In addition, I will present some results on the control of superconducting flux qubits, obtained in collaboration with the Orlando group at MIT. The control techniques discussed in this thesis may help provide new directions for experimental research on nuclear spin dynamics in solids, and may be applied to help enable future spintronics or quantum information processing tasks.
by Mark S. Rudner.
Ph.D.
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Saizar, Pedro. "Multiwavelength studies of classical nova shells /." The Ohio State University, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487780865408208.

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Klales, Anna. "A Classical Perspective on Non-Diffractive Disorder." Thesis, Harvard University, 2016. http://nrs.harvard.edu/urn-3:HUL.InstRepos:26718765.

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The unifying themes connecting the chapters in this dissertation are the profound and often surprising effects of disorder in classical and quantum systems and the tremendous insight gained from a classical perspective, even in quantum systems. In particular, we investigate disorder in the form of weak, spatially correlated random potentials, i.e. far from the Anderson Localization regime. We present a new scar-like phenomenon in quantum wells. With the introduction of local impurities to the oscillator, the eigenstates localize onto classical periodic orbits of the unperturbed system. Compared to traditional scars in chaotic billiards, these scars are both more common and stronger. Though the unperturbed system has circular symmetry, the random perturbation selects a small number of orientations which are shared by many scarred states -- dozens or even hundreds -- over a range of energies. We show, via degenerate perturbation theory, that the cause of the new scars is the combination of an underlying classical resonance of the unperturbed system and a perturbation induced coupling that is strongly local in action space. Next we examine the same type of local perturbation applied to an open system: branched flow. Caustics in the manifold of trajectories have been implicated in the formation of strong branches. We show that caustic formation is intimately tied to compression of manifolds of trajectories in phase space, which has important implications for the position space density. We introduce the "Kick and Drift" model, a generalization of the standard map. The model is a good approximation to the full two dimensional dynamics of a wave propagating over a weak random potential, but it provides a simpler framework for studying branched flow. Next we develop a classical model for electrons executing cyclotron motion in a graphene flake and implement it numerically. We derive classical equations of motion for electrons moving through the graphene flake with a position dependent effective mass due to fluctuations in the background carrier density. I apply these methods to an experiment performed by the Westervelt group. They imaged the flow of electrons in a graphene flake by measuring the transresistance as they rastered a charged scanning probe microscope tip over the surface. My simulations show that the regions with the greatest change in transresistance do always coincide with the regions with the highest current density. Furthermore I show that the experimental results can qualitatively reproduced by treating the system classically. Finally, we extend Heller's thawed Gaussian approximation from second order in the classical action to third order, in order to capture curvature in phase space. Such phase space dynamics are ubiquitous in systems with weak random potentials, such as those discussed above. We derive a closed form solution, but find that more work needs to be done to make it numerically tractable and competitive with other methods. A semiclassical method capturing phase space curvature could provide insight into the behavior of scars away from the hbar goes to zero limit.
Physics
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Cotton, Stephen Joshua. "Symmetrical Windowing for Quantum States in Quasi-Classical Trajectory Simulations." Thesis, University of California, Berkeley, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3686249.

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An approach has been developed for extracting approximate quantum state-to-state information from classical trajectory simulations which "quantizes" symmetrically both the initial and final classical actions associated with the degrees of freedom of interest using quantum number bins (or "window functions") which are significantly narrower than unit-width. This approach thus imposes a more stringent quantization condition on classical trajectory simulations than has been traditionally employed, while doing so in a manner that is time-symmetric and microscopically reversible.

To demonstrate this "symmetric quasi-classical" (SQC) approach for a simple real system, collinear H + H2 reactive scattering calculations were performed [S.J. Cotton and W.H. Miller, J. Phys. Chem. A 117, 7190 (2013)] with SQC-quantization applied to the H 2 vibrational degree of freedom (DOF). It was seen that the use of window functions of approximately 1/2-unit width led to calculated reaction probabilities in very good agreement with quantum mechanical results over the threshold energy region, representing a significant improvement over what is obtained using the traditional quasi-classical procedure.

The SQC approach was then applied [S.J. Cotton and W.H. Miller, J. Chem. Phys. 139, 234112 (2013)] to the much more interesting and challenging problem of incorporating non-adiabatic effects into what would otherwise be standard classical trajectory simulations. To do this, the classical Meyer-Miller (MM) Hamiltonian was used to model the electronic DOFs, with SQC-quantization applied to the classical "electronic" actions of the MM model—representing the occupations of the electronic states—in order to extract the electronic state population dynamics. It was demonstrated that if one ties the zero-point energy (ZPE) of the electronic DOFs to the SQC windowing function's width parameter this very simple SQC/MM approach is capable of quantitatively reproducing quantum mechanical results for a range of standard benchmark models of electronically non-adiabatic processes, including applications where "quantum" coherence effects are significant. Notably, among these benchmarks was the well-studied "spin-boson" model of condensed phase non-adiabatic dynamics, in both its symmetric and asymmetric forms—the latter of which many classical approaches fail to treat successfully.

The SQC/MM approach to the treatment of non-adiabatic dynamics was next applied [S.J. Cotton, K. Igumenshchev, and W.H. Miller, J. Chem. Phys., 141, 084104 (2014)] to several recently proposed models of condensed phase electron transfer (ET) processes. For these problems, a flux-side correlation function framework modified for consistency with the SQC approach was developed for the calculation of thermal ET rate constants, and excellent accuracy was seen over wide ranges of non-adiabatic coupling strength and energetic bias/exothermicity. Significantly, the "inverted regime" in thermal rate constants (with increasing bias) known from Marcus Theory was reproduced quantitatively for these models—representing the successful treatment of another regime that classical approaches generally have difficulty in correctly describing. Relatedly, a model of photoinduced proton coupled electron transfer (PCET) was also addressed, and it was shown that the SQC/MM approach could reasonably model the explicit population dynamics of the photoexcited electron donor and acceptor states over the four parameter regimes considered.

The potential utility of the SQC/MM technique lies in its stunning simplicity and the ease by which it may readily be incorporated into "ordinary" molecular dynamics (MD) simulations. In short, a typical MD simulation may be augmented to take non-adiabatic effects into account simply by introducing an auxiliary pair of classical "electronic" action-angle variables for each energetically viable Born-Oppenheimer surface, and time-evolving these auxiliary variables via Hamilton's equations (using the MM electronic Hamiltonian) in the same manner that the other classical variables—i.e., the coordinates of all the nuclei—are evolved forward in time. In a complex molecular system involving many hundreds or thousands of nuclear DOFs, the propagation of these extra "electronic" variables represents a modest increase in computational effort, and yet, the examples presented herein suggest that in many instances the SQC/MM approach will describe the true non-adiabatic quantum dynamics to a reasonable and useful degree of quantitative accuracy.

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Books on the topic "Classical physics"

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Karaoglu, Bekir. Classical Physics. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-38456-2.

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Cunningham, Mark A. Beyond Classical Physics. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-63160-8.

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Thirring, Walter. Classical Mathematical Physics. New York, NY: Springer New York, 1997. http://dx.doi.org/10.1007/978-1-4612-0681-1.

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Matzner, Richard A. Classical Mechanics. Englewood Cliffs, N.J: Prentice Hall, 1991.

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1934-, Keller Frederick J., and Skove Malcolm J. 1931-, eds. Physics, classical and modern. New York: McGraw-Hill, 1989.

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Marmo, G., David Martín de Diego, and Miguel Muñoz Lecanda, eds. Classical and Quantum Physics. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-24748-5.

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Cassatella, A., and R. Viotti, eds. Physics of Classical Novae. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/3-540-53500-4.

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Knauf, Andreas. Mathematical Physics: Classical Mechanics. Berlin, Heidelberg: Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-662-55774-7.

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Edward, Gettys W., and Skove Malcolm J. 1931-, eds. Physics, classical and modern. 2nd ed. New York: McGraw-Hill, 1993.

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1939-, Gettys W. Edward, and Skove Malcolm J. 1931-, eds. Physics: Classical and modern. 2nd ed. New York: McGraw-Hill, 1993.

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Book chapters on the topic "Classical physics"

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Dürr, Detlef, and Stefan Teufel. "Classical Physics." In Bohmian Mechanics, 11–42. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/b99978_2.

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Bolivar, A. O. "Classical Physics." In The Frontiers Collection, 53–87. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-09649-9_3.

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Battaglia, Franco, and Thomas F. George. "Classical Physics." In Fundamentals in Chemical Physics, 1–15. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-1636-9_1.

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Martins, Carlos. "Classical Physics." In Astronomers' Universe, 121–65. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-49632-6_4.

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Piccirillo, Lucio. "Classical Physics." In Introduction to the Maths and Physics of Quantum Mechanics, 2–30. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003145561-1.

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Nolting, Wolfgang. "Classical Statistical Physics." In Theoretical Physics 8, 1–93. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73827-7_1.

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Shavlik, Jude W. "Learning Classical Physics." In The Kluwer International Series in Engineering and Computer Science, 307–10. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4613-2279-5_62.

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d’Emilio, Emilio, and Luigi E. Picasso. "Classical Systems." In UNITEXT for Physics, 1–12. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-53267-7_1.

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Zamastil, Jaroslav. "Classical Electrodynamics." In SpringerBriefs in Physics, 7–23. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-37373-2_2.

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Hassani, Sadri. "Classical Orthogonal Polynomials." In Mathematical Physics, 172–95. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-87429-1_8.

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Conference papers on the topic "Classical physics"

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Shore, Steven N. "Panchromatic Study of Novae in Outburst: Phenomenology and Physics." In CLASSICAL NOVA EXPLOSIONS: International Conference on Classical Nova Explosions. AIP, 2002. http://dx.doi.org/10.1063/1.1518197.

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Dreyfus, Benjamin W., Erin Ronayne Sohr, Ayush Gupta, and Andrew Elby. "“Classical-ish”: Negotiating the Boundary between Classical and Quantum Particles." In 2015 Physics Education Research Conference. American Association of Physics Teachers, 2015. http://dx.doi.org/10.1119/perc.2015.pr.023.

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Omnès, Roland. "Emergence in Physics: the Case of Classical Physics." In Proceedings of the Annual Meeting of the International Academy of the Philosophy of Science. WORLD SCIENTIFIC, 2002. http://dx.doi.org/10.1142/9789812776617_0007.

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March-Russell, John. "Classical and quantum brane cosmology." In Cosmology and particle physics. AIP, 2001. http://dx.doi.org/10.1063/1.1363507.

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Sitkey, Matúš, and Terézia Jindrová. "MISCONCEPTIONS IN QUANTUM PHYSICS ARISING FROM THE CLASSICAL PHYSICS." In 13th annual International Conference of Education, Research and Innovation. IATED, 2020. http://dx.doi.org/10.21125/iceri.2020.0674.

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Gutiérrez, L., A. Díaz-de-Anda, J. Flores, R. A. Méndez-Sánchez, G. Monsivais, A. Morales, Moises Martinez-Mares, and Jose A. Moreno-Razo. "Classical Analogs of a Diatomic Chain." In CONDENSED MATTER PHYSICS: IV Mexican Meeting on Experimental and Theoretical Physics: Symposium on Condensed Matter Physics. AIP, 2010. http://dx.doi.org/10.1063/1.3536615.

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ROSSI, ARCANGELO. "MATHEMATICAL MODELS AND PHYSICAL REALITY FROM CLASSICAL TO QUANTUM PHYSICS." In Historical Analysis and Open Questions — Cesena 2004. WORLD SCIENTIFIC, 2006. http://dx.doi.org/10.1142/9789812773258_0025.

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Mandel, L. "Non-classical interference experiments with photon pairs." In Atomic physics 12. AIP, 1991. http://dx.doi.org/10.1063/1.40962.

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Garbaczewski, P., and Z. Popowicz. "Nonlinear Fields: Classical Random Semiclassical." In XXVII Winter School of Theoretical Physics. WORLD SCIENTIFIC, 1991. http://dx.doi.org/10.1142/9789814538954.

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Arranz, F. J., R. M. Benito, and F. Borondo. "Quantum and Classical Resonances." In FRONTIERS OF FUNDAMENTAL PHYSICS: Eighth International Symposium FFP8. AIP, 2007. http://dx.doi.org/10.1063/1.2737024.

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Reports on the topic "Classical physics"

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Browning, David G., and Paul D. Scully-Power. Spreading Loss and Attenuation in Classical Physics: Lessons from Underwater Acoustics. Fort Belvoir, VA: Defense Technical Information Center, June 1987. http://dx.doi.org/10.21236/ada183052.

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Saptsin, Vladimir, and Володимир Миколайович Соловйов. Relativistic quantum econophysics – new paradigms in complex systems modelling. [б.в.], July 2009. http://dx.doi.org/10.31812/0564/1134.

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This work deals with the new, relativistic direction in quantum econophysics, within the bounds of which a change of the classical paradigms in mathematical modelling of socio-economic system is offered. Classical physics proceeds from the hypothesis that immediate values of all the physical quantities, characterizing system’s state, exist and can be accurately measured in principle. Non-relativistic quantum mechanics does not reject the existence of the immediate values of the classical physical quantities, nevertheless not each of them can be simultaneously measured (the uncertainty principle). Relativistic quantum mechanics rejects the existence of the immediate values of any physical quantity in principle, and consequently the notion of the system state, including the notion of the wave function, which becomes rigorously nondefinable. The task of this work consists in econophysical analysis of the conceptual fundamentals and mathematical apparatus of the classical physics, relativity theory, non-relativistic and relativistic quantum mechanics, subject to the historical, psychological and philosophical aspects and modern state of the socio-economic modeling problem. We have shown that actually and, virtually, a long time ago, new paradigms of modeling were accepted in the quantum theory, within the bounds of which the notion of the physical quantity operator becomes the primary fundamental conception(operator is a mathematical image of the procedure, the action), description of the system dynamics becomes discrete and approximate in its essence, prediction of the future, even in the rough, is actually impossible when setting aside the aftereffect i.e. the memory. In consideration of the analysis conducted in the work we suggest new paradigms of the economical-mathematical modeling.
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Saptsin, V., Володимир Миколайович Соловйов, and I. Stratychuk. Quantum econophysics – problems and new conceptions. КНУТД, 2012. http://dx.doi.org/10.31812/0564/1185.

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This article is dedicated to the econophysical analysis of conceptual fundamentals and mathematical apparatus of classical physics, relativity theory, non-relativistic and relativistic quantum mechanics. The historical and methodological aspects as well as the modern state of the problem of the socio-economic modeling are considered.
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Feng, Shechao Charles. Applications of mesoscopic physics to novel correlations and fluctuations of speckle patterns: Imaging and tomography with multiply scattered classical waves. Final report. Office of Scientific and Technical Information (OSTI), February 1995. http://dx.doi.org/10.2172/79022.

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Perdigão, Rui A. P. Beyond Quantum Security with Emerging Pathways in Information Physics and Complexity. Synergistic Manifolds, June 2022. http://dx.doi.org/10.46337/220602.

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Information security and associated vulnerabilities have long been a pressing challenge, from the fundamental scientific backstage to the frontline across the most diverse sectors of society. At the tip of the iceberg of this problem, the citizens immediately feel that the reservation of privacy and the degradation of the quality and security of the information and communication on which they depend for the day-to-day activities, already of crucial relevance, are at stake. Naturally though, the challenges do not end there. There is a whole infrastructure for storing information, processing and communication, whose security and reliability depend on key sectors gearing modern society – such as emergency communication systems (medical, civil and environmental protection, among others), transportation and geographic information, the financial communications systems at the backbone of day-to-day transactions, the information and telecommunications systems in general. And crucially the entire defence ecosystem that in essence is a stalwart in preventing our civilisation to self-annihilate in full fulfilment of the second principle of thermodynamics. The relevance of the problem further encompasses the preservation of crucial values such as the right to information, security and integrity of democratic processes, internal administration, justice, defence and sovereignty, ranging from the well-being of the citizen to the security of the nation and beyond. In the present communication, we take a look at how to scientifically and technically empower society to address these challenges, with the hope and pragmatism enabled by our emerging pathways in information physics and complexity. Edging beyond classical and quantum frontiers and their vulnerabilities to unveil new principles, methodologies and technologies at the core of the next generation system dynamic intelligence and security. To illustrate the concepts and tools, rather than going down the road of engineered systems that we can ultimately control, we take aim at the bewildering complexity of nature, deciphering new secrets in the mathematical codex underlying its complex coevolutionary phenomena that so heavily impact our lives, and ultimately bringing out novel insights, methods and technologies that propel information physics and security beyond quantum frontiers.
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Massarczyk, Ralph. Interesting Isomers - From classic nuclear physics to dark matter -. Office of Scientific and Technical Information (OSTI), September 2023. http://dx.doi.org/10.2172/2005786.

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Agüero, Jorge M., and Verónica Frisancho. Misreporting in Sensitive Health Behaviors and Its Impact on Treatment Effects: An Application to Intimate Partner Violence. Inter-American Development Bank, December 2017. http://dx.doi.org/10.18235/0011808.

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A growing literature seeks to identify policies that could reduce intimate partner violence. However, in the absence of reliable administrative records, this violence is often measured using self-reported data from health surveys. In this paper, an experiment is conducted comparing data from such surveys against a methodology that provides greater privacy to the respondent. Non-classical measurement error in health surveys is identified as college-educated women, but not the less educated, underreport physical and sexual violence. The paper provides a low-cost solution to correct the bias in the estimation of causal effects under non-classical measurement error in the dependent variable.
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Murphy, Sean, Mohini Bariya, Debbie Chang, Jeff Lin, Chris Ryan, and Ramiro Mata. Combinatorial Evaluation of Physical Feature Engineering, Classical Machine Learning, and Deep Learning Models for Synchrophasor Data at Scale. Office of Scientific and Technical Information (OSTI), April 2022. http://dx.doi.org/10.2172/1864556.

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Aursjø, Olav, Aksel Hiorth, Alexey Khrulenko, and Oddbjørn Mathias Nødland. Polymer flooding: Simulation Upscaling Workflow. University of Stavanger, November 2021. http://dx.doi.org/10.31265/usps.203.

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There are many issues to consider when implementing polymer flooding offshore. On the practical side one must handle large volumes of polymer in a cost-efficient manner, and it is crucial that the injected polymer solutions maintain their desired rheological properties during transit from surface facilities and into the reservoir. On the other hand, to predict polymer flow in the reservoir, one must conduct simulations to find out which of the mechanisms observed at the pore and core scales are important for field behavior. This report focuses on theoretical aspects relevant for upscaling of polymer flooding. To this end, several numerical tools have been developed. In principle, the range of length scales covered by these tools is extremely wide: from the nm (10-9 m) to the mm (10-3 m) range, all the way up to the m and km range. However, practical limitations require the use of other tools as well, as described in the following paragraphs. The simulator BADChIMP is a pore-scale computational fluid dynamics (CFD) solver based on the Lattice Boltzmann method. At the pore scale, fluid flow is described by classical laws of nature. To a large extent, pore scale simulations can therefore be viewed as numerical experiments, and they have great potential to foster understanding of the detailed physics of polymer flooding. While valid across length scales, pore scale models require a high numerical resolution, and, subsequently, large computational resources. To model laboratory experiments, the NIORC has, through project 1.1.1 DOUCS, developed IORCoreSim. This simulator includes a comprehensive model for polymer rheological behavior (Lohne A. , Stavland, Åsen, Aursjø, & Hiorth, 2021). The model is valid at all continuum scales; however, the simulator implementation is not able to handle very large field cases, only smaller sector scale systems. To capture polymer behavior at the full field scale, simulators designed for that specific purpose must be used. One practical problem is therefore: How can we utilize the state-of-the-art polymer model, only found in IORCoreSim, as a tool to decrease the uncertainty in full field forecasts? To address this question, we suggest several strategies for how to combine different numerical tools. In the Methodological Approach section, we briefly discuss the more general issue of linking different scales and simulators. In the Validation section, we present two case studies demonstrating the proposed strategies and workflows.
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Huatian, Xu, and Bi Wuxi. PR469-183600-R01 The Influence of Solid State Decouplers on Pipeline CP Surveys. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), October 2020. http://dx.doi.org/10.55274/r0011935.

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The objectives of this research are to figure out how solid state decouplers (SSDs) influence the surveys related to pipeline cathodic protection (CP) and provide corresponding field guidelines on how to mitigate the adverse effects of SSDs. Firstly, by combining the classical capacitor discharge theory and the equivalent circuit of the CP system, a four-stage physical model is built to explain how SSDs' discharge current pulse influences the CP related readings. From the physical model, we can obtain the following conclusions: (1) The driving force behind the discharging of an SSD's capacitor, after CP currents are cut off, is the voltage drop in the pipeline; (2)There are two contributors to the CP instant-off potential spikes: self-induced pipeline current and SSD discharge current; (3) The time constant ( and tau;=RC) of an SSD installation determines how fast the SSD finishes its discharging process; (4) The adverse effects of SSDs can be mitigated by making the SSD discharge time constant and tau; small enough (3 and tau; Before performing numerical modeling, some commonly used SSDs are tested for their capacitances in the lab according to the classical capacitor impedance theory. The test results show that the typical SSD capacitance is between 0.15 F and 0.36 F. The target pipeline for numerical modeling is a 50 km pipeline with different levels of coating quality, SSD grounding resistance, and SSD capacitance. An equivalent circuit model with ten parallel branches is built accordingly, and solved by an open-source electrical circuit software module. The numerical modeling results firmly support the primary conclusions drawn from the four-stage physical model. Moreover, the parallel analog circuit tests in the lab further prove the rationality of the four-stage model. Finally, comprehensive field tests are performed to study how SSDs influence the CP install-off potential survey, close interval potential survey, direct current voltage gradient, and alternating current voltage gradient. Practical field guidelines on how to mitigate SSDs' influence are proposed.
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