Results for 'time reversal operator'

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  1.  61
    The Quantum Mechanical Time Reversal Operator.Andrew Holster - unknown
    The analysis of the reversibility of quantum mechanics depends upon the choice of the time reversal operator for quantum mechanical states. The orthodox choice for the time reversal operator on QM states is known as the Wigner operator, T*, where * performs complex conjugation. The peculiarity is that this is not simply the unitary time reversal operation, but an anti-unitary operator, involving complex conjugation in addition to ordinary time (...). The alternative choice is the Racah operator, which is simply ordinary time reversal, T. Orthodox treatments hold that it is either logically or empirically necessary to adopt the Wigner operator, and the Racah operator has received little attention. The basis for this choice is analysed in detail, and it is concluded that all the conventional arguments for rejecting the Racah operator and adopting the Wigner operator are mistaken. The additional problem of whether the deterministic part of quantum mechanics should be judged to be reversible or not is also considered. The adoption of the Racah operator for time reversal appears prima facie to entail that quantum mechanics is irreversible. However, it is concluded that the real answer to question depends upon the choice of interpretation of the theory. In any case, the conventional reasons for claiming that quantum mechanics is reversible are incorrect. (shrink)
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  2.  22
    The Time Reversal Operator for Semigroup Evolutions.Arno Bohm & Sujeewa Wickramasekara - 1997 - Foundations of Physics 27 (7):969-993.
    A quantum theory combining an irreversible time evolution semigroup with a time reversal operator is presented.
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  3. On the Time Reversal Invariance of Classical Electromagnetic Theory.David B. Malament - 2003 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 35 (2):295-315.
    David Albert claims that classical electromagnetic theory is not time reversal invariant. He acknowledges that all physics books say that it is, but claims they are ``simply wrong" because they rely on an incorrect account of how the time reversal operator acts on magnetic fields. On that account, electric fields are left intact by the operator, but magnetic fields are inverted. Albert sees no reason for the asymmetric treatment, and insists that neither field should (...)
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  4.  56
    Time Reversal Operations, Representations of the Lorentz Group, and the Direction of Time.Frank Arntzenius - 2004 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 35 (1):31-43.
    A theory is usually said to be time reversible if whenever a sequence of states S 1 , S 2 , S 3 is possible according to that theory, then the reverse sequence of time reversed states S 3 T , S 2 T , S 1 T is also possible according to that theory; i.e., one normally not only inverts the sequence of states, but also operates on the states with a time reversal operator (...)
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  5.  4
    Time Reversal Operations, Representations of the Lorentz Group, and the Direction of Time.Frank Arntzenius - 2003 - Studies in History and Philosophy of Modern Physics 35 (1):31-43.
    A theory is usually said to be time reversible if whenever a sequence of states S 1, S 2, S 3 is possible according to that theory, then the reverse sequence of time reversed states S 3 T, S 2 T, S 1 T is also possible according to that theory; i.e., one normally not only inverts the sequence of states, but also operates on the states with a time reversal operator T. David Albert and (...)
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  6.  3
    The Incompleteness of Extensional Object Languages of Physics and Time Reversal. Part 2.Andrew Holster - unknown
    This continues from Part 1. It is shown how an intensional interpretation of physics object languages can be formalised, and how a syntactic compositional time reversal operator can subsequently be defined. This is applied to solve the problems used as examples in Part 1. A proof of a general theorem that such an operator must be defineable is sketched. A number of related issues about the interpretation of theories of physics, including classical and quantum mechanics and (...)
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  7. Causation and Time Reversal.Matt Farr - 2020 - British Journal for the Philosophy of Science 71 (1):177-204.
    What would it be for a process to happen backwards in time? Would such a process involve different causal relations? It is common to understand the time-reversal invariance of a physical theory in causal terms, such that whatever can happen forwards in time can also happen backwards in time. This has led many to hold that time-reversal symmetry is incompatible with the asymmetry of cause and effect. This article critiques the causal reading of (...)
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  8. Time, Order, Chaos.J. T. Fraser, M. P. Soulsby, Alex Argyros & International Society for the Study of Time - 1998
     
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  9.  72
    Time-Symmetric Quantum Mechanics.K. B. Wharton - 2007 - Foundations of Physics 37 (1):159-168.
    A time-symmetric formulation of nonrelativistic quantum mechanics is developed by applying two consecutive boundary conditions onto solutions of a time- symmetrized wave equation. From known probabilities in ordinary quantum mechanics, a time-symmetric parameter P0 is then derived that properly weights the likelihood of any complete sequence of measurement outcomes on a quantum system. The results appear to match standard quantum mechanics, but do so without requiring a time-asymmetric collapse of the wavefunction upon measurement, thereby realigning quantum (...)
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  10.  76
    Three Myths About Time Reversal in Quantum Theory.Bryan W. Roberts - 2017 - Philosophy of Science 84 (2):315-334.
    Many have suggested that the transformation standardly referred to as `time reversal' in quantum theory is not deserving of the name. I argue on the contrary that the standard definition is perfectly appropriate, and is indeed forced by basic considerations about the nature of time in the quantum formalism.
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  11.  21
    The Born Rule and Time-Reversal Symmetry of Quantum Equations of Motion.Aleksey V. Ilyin - 2016 - Foundations of Physics 46 (7):845-851.
    It was repeatedly underlined in literature that quantum mechanics cannot be considered a closed theory if the Born Rule is postulated rather than derived from the first principles. In this work the Born Rule is derived from the time-reversal symmetry of quantum equations of motion. The derivation is based on a simple functional equation that takes into account properties of probability, as well as the linearity and time-reversal symmetry of quantum equations of motion. The derivation presented (...)
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  12.  98
    Surmounting the Cartesian Cut Through Philosophy, Physics, Logic, Cybernetics, and Geometry: Self-Reference, Torsion, the Klein Bottle, the Time Operator, Multivalued Logics and Quantum Mechanics. [REVIEW]Diego L. Rapoport - 2011 - Foundations of Physics 41 (1):33-76.
    In this transdisciplinary article which stems from philosophical considerations (that depart from phenomenology—after Merleau-Ponty, Heidegger and Rosen—and Hegelian dialectics), we develop a conception based on topological (the Moebius surface and the Klein bottle) and geometrical considerations (based on torsion and non-orientability of manifolds), and multivalued logics which we develop into a unified world conception that surmounts the Cartesian cut and Aristotelian logic. The role of torsion appears in a self-referential construction of space and time, which will be further related (...)
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  13.  39
    Time-Reversal, Irreversibility and Arrow of Time in Quantum Mechanics.M. Castagnino, M. Gadella & O. Lombardi - 2006 - Foundations of Physics 36 (3):407-426.
    The aim of this paper is to analyze time-asymmetric quantum mechanics with respect of its validity as a non time-reversal invariant, time-asymmetric theory as well as of its ability to determine an arrow of time.
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  14. What Time Reversal Invariance is and Why It Matters.John Earman - 2002 - International Studies in the Philosophy of Science 16 (3):245 – 264.
    David Albert's Time and Chance (2000) provides a fresh and interesting perspective on the problem of the direction of time. Unfortunately, the book opens with a highly non-standard exposition of time reversal invariance that distorts the subsequent discussion. The present article not only has the remedial goal of setting the record straight about the meaning of time reversal invariance, but it also aims to show how the niceties of this symmetry concept matter to the (...)
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  15. Time Reversal in Classical Electromagnetism.Frank Arntzenius & Hilary Greaves - 2009 - British Journal for the Philosophy of Science 60 (3):557-584.
    Richard Feynman has claimed that anti-particles are nothing but particles `propagating backwards in time'; that time reversing a particle state always turns it into the corresponding anti-particle state. According to standard quantum field theory textbooks this is not so: time reversal does not turn particles into anti-particles. Feynman's view is interesting because, in particular, it suggests a nonstandard, and possibly illuminating, interpretation of the CPT theorem. In this paper, we explore a classical analog of Feynman's view, (...)
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  16. Maxwell's Paradox: The Metaphysics of Classical Electrodynamics and its Time Reversal Invariance.Valia Allori - 2015 - Analytica: an electronic, open-access journal for philosophy of science 1:1-19.
    In this paper, I argue that the recent discussion on the time - reversal invariance of classical electrodynamics (see (Albert 2000: ch.1), (Arntzenius 2004), (Earman 2002), (Malament 2004),(Horwich 1987: ch.3)) can be best understood assuming that the disagreement among the various authors is actually a disagreement about the metaphysics of classical electrodynamics. If so, the controversy will not be resolved until we have established which alternative is the most natural. It turns out that we have a paradox, namely (...)
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  17. Two Views on Time Reversal.Jill North - 2008 - Philosophy of Science 75 (2):201-223.
    In a recent paper, Malament (2004) employs a time reversal transformation that differs from the standard one, without explicitly arguing for it. This is a new and important understanding of time reversal that deserves arguing for in its own right. I argue that it improves upon the standard one. Recent discussion has focused on whether velocities should undergo a time reversal operation. I address a prior question: What is the proper notion of time (...)
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  18.  32
    Can the Second Law Be Compatible with Time Reversal Invariant Dynamics?Leah Henderson - 2014 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 47:90-98.
    It is commonly thought that there is some tension between the second law of thermodynam- ics and the time reversal invariance of the microdynamics. Recently, however, Jos Uffink has argued that the origin of time reversal non-invariance in thermodynamics is not in the second law. Uffink argues that the relationship between the second law and time reversal invariance depends on the formulation of the second law. He claims that a recent version of the second (...)
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  19.  55
    Prospects for a New Account of Time Reversal.Daniel Peterson - 2015 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 49:42-56.
    In this paper I draw the distinction between intuitive and theory-relative accounts of the time reversal symmetry and identify problems with each. I then propose an alternative to these two types of accounts that steers a middle course between them and minimizes each account’s problems. This new account of time reversal requires that, when dealing with sets of physical theories that satisfy certain constraints, we determine all of the discrete symmetries of the physical laws we are (...)
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  20.  26
    Time Reversal.Bryan W. Roberts - forthcoming - In Eleanor Knox & Alistair Wilson (eds.), Routledge Companion to the Philosophy of Physics.
    This article deals with the question of what time reversal means. It begins with a presentation of the standard account of time reversal, with plenty of examples, followed by a popular non-standard account. I argue that, in spite of recent commentary to the contrary, the standard approach to the meaning of time reversal is the only one that is philosophically and physically viable. The article concludes with a few open research problems about time (...)
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  21.  97
    Time Reversal for Systems with Internal Symmetry.E. C. G. Sudarshan & L. C. Biedenharn - 1995 - Foundations of Physics 25 (1):139-143.
    Wigner time reversal implemented by antiunitary transformations on the wavefunctions is to be refined if we are to deal with systems with internal symmetry. The necessary refinements are formulated. Application to a number of physical problems is made with some unexpected revelations about some popular models.
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  22.  50
    Time-Reversal Invariance and Irreversibility in Time-Asymmetric Quantum Mechanics.Mario Castagnino, Manuel Gadella & Olimpia Lombardi - unknown
    The aim of this paper is to analyze the concepts of time-reversal invariance and irreversibility in the so-called 'time-asymmetric quantum mechanics'. We begin with pointing out the difference between these two concepts. On this basis, we show that irreversibility is not as tightly linked to the semigroup evolution laws of the theory -which lead to its non time-reversal invariance- as usually suggested. In turn, we argue that the irreversible evolutions described by the theory are coarse-grained (...)
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  23.  16
    Time Reversal Symmetry and Collapse Models.D. J. Bedingham & O. J. E. Maroney - 2017 - Foundations of Physics 47 (5):670-696.
    Dynamical collapse models embody the idea of a physical collapse of the wave function in a mathematically well-defined way. They involve modifications to the standard rules of quantum theory in order to describe collapse as a physical process. This appears to introduce a time reversal asymmetry into the dynamics since the state at any given time depends on collapses in the past but not in the future. Here we challenge this conclusion by demonstrating that, subject to specified (...)
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  24.  28
    The Logic of Time Reversal.E. J. Post - 1979 - Foundations of Physics 9 (1-2):129-161.
    Active time reversal in the sense of “object reversal” and passive time reversal in the sense of a frame reversal of time are discussed separately and then together so as to bring out their dual nature. An understanding of that duality makes it unavoidable to contrast symmetry properties of matter with symmetry properties to be assigned to antimatter. Only frame reversal of time can “see” all conceivable active time reversals relevant (...)
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  25.  13
    A New Interpretation of Time Reversal.Sun-Tak Hwang - 1972 - Foundations of Physics 2 (4):315-326.
    A new interpretation of the time-reversal invariance principle is given. As a result, it is shown that microscopic dynamic reversibility has no basis in physics. The existing contradiction between one-way time and two-way time is reconciled. It is also pointed out that the common notion that clocks run backwards when time is reversed is wrong.
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  26.  21
    The Incompleteness of Extensional Object Languages of Physics and Time Reversal. Part.Andrew Holster - unknown
    This paper argues that ordinary object languages for fundamental physics are incomplete, essentially because they are extensional, and consequently lack any adequate formal representation of contingency. It is shown that it is impossible to formulate adequate deduction systems for general transformations in such languages. This is argued in detail for the time reversal transformation. Two important controversies about the application of time reversal in quantum mechanics are summarized at the start, to provide the context of this (...)
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  27.  24
    The Time Reversal Invariance of Classical Electromagnetic Theory: Albert Versus Malament.Andrew Holster - unknown
    David Albert has recently argued that classical electromagnetic theory (EM) is not time reversal invariant (non-TRI), while David Malament rejects this argument and maintains the orthodox result, that EM is TRI. Both Albert's and Malament's arguments are analysed, and both are found wanting in certain respects. It is argued here that the result really depends on the choice of theoretical ontology choosen to interpret EM theory, and there is more than one plausible choice. Albert and Malament have choosen (...)
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  28.  12
    On Conservation of Parity and Time Reversal and Composite Models of Particles.A. O. Barut - 1983 - Foundations of Physics 13 (1):7-12.
    We show that it is possible to consider parity and time reversal, as basic geometric symmetry operations, as being absolutely conserved. The observations of symmetry-violating pseudoscalar quantities can be attributed to the fact that some particles, due to their internal structure, are not eigenstates of parity or CP, and there is no reason that they should be. In terms of a model it is shown how, in spite of this, pseudoscalar terms are small in strong interactions. The neutrino (...)
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  29.  2
    The Incompleteness of Extensional Object Languages of Physics and Time Reversal. Part 1.Andrew Holster - unknown
    This paper argues that ordinary object languages for fundamental physics are incomplete, essentially because they are extensional, and consequently lack any adequate formal representation of contingency. It is shown that it is impossible to formulate adequate deduction systems for general transformations in such languages. This is argued in detail for the time reversal transformation. Two important controversies about the application of time reversal in quantum mechanics are summarized at the start, to provide the context of this (...)
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  30. Quantum Time Arrows, Semigroups and Time-Reversal in Scattering.Robert C. Bishop - 2005 - International Journal of Theoretical Physics:723-733.
    Two approaches toward the arrow of time for scattering processes have been proposed in rigged Hilbert space quantum mechanics. One, due to Arno Bohm, involves preparations and registrations in laboratory operations and results in two semigroups oriented in the forward direction of time. The other, employed by the Brussels-Austin group, is more general, involving excitations and de-excitations of systems, and apparently results in two semigroups oriented in opposite directions of time. It turns out that these two (...) arrows can be related to each other via Wigner's extensions of the spacetime symmetry group. Furthermore, their are subtle differences in causality as well as the possibilities for the existence and creation of time-reversed states depending on which time arrow is chosen. (shrink)
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  31.  18
    Time Asymmetry, Time Reversal, and Irreversibility.Mario Bunge - 1972 - In J. T. Fraser, F. Haber & G. Muller (eds.), The Study of Time. Springer Verlag. pp. 122--130.
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  32.  2
    Are the Laws of Nature Time Reversal Symmetric?: The Arrow of Time, or Better: The Arrow of Directional Processes.Paul Weingartner - 2006 - In Michael Stöltzner & Friedrich Stadler (eds.), Time and History: Proceedings of the 28. International Ludwig Wittgenstein Symposium, Kirchberg Am Wechsel, Austria 2005. De Gruyter. pp. 289-300.
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  33. Time Reversal in Human Cognition: Search for a Temporal Theory of Insanity.Suchoon S. Mo - 1990 - In Richard A. Block (ed.), Cognitive Models of Psychological Time. Lawrence Erlbaum. pp. 241--254.
     
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  34.  50
    Into the Interval: On Deleuze's Reversal of Time and Movement.Stephen Crocker - 2001 - Continental Philosophy Review 34 (1):45-67.
    The reversal in the relation of time and movement which Deleuze describes in his Cinema books does not only concern a change in the filmic arts. Deleuze associates it with a wider Copernican turn in science, philosophy, art and indeed modern experience as a whole. Experience no longer consists of an idea plus the time it takes to realize it. Instead, time is implicated in the determination, literally the creation of the terminus of any movement of (...)
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  35.  25
    Bergsons Time and the Time Operator.Ioannis Antoniaou & Theodoros Christidis - 2010 - Mind and Matter 8 (2):185-202.
    Bergson's views on time are supported by the time operator qualifying complex systems with a concept of time that is essentially difierent from the clock time used to register the events. Irreversibility, unpredictability, and innovation characterize complex systems in contrast with the reversibility, predictability and lack of novelties of the regular motions of integrable systems. The idea for this work came from our teacher Ilya Prigogine who pointed out repeatedly that the time operator (...)
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  36.  64
    From Time Operator to Chronons.B. Misra - 1995 - Foundations of Physics 25 (7):1087-1104.
    A time operator, which incorporates the idea of time as a dynamical variable, was first introduced in the context of a theory of irreversible evolution. The existence of a time operator has interesting implications in several areas of physics. Here we demonstrate a close link between the existence of the time operator for relativistic particles and the existence of an indivisible time interval or chronons for dynamical evolution. More explicitly, we consider a (...)
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  37.  14
    Time Reversal Operations, Representations of the Lorentz Group, and the Direction of Time.Frank Arntzenius - 2004 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 35 (1):31-43.
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  38.  89
    The Metaphysics of Time Reversal: Hutchison on Classical Mechanics.Craig Callender - 1995 - British Journal for the Philosophy of Science 46 (3):331-340.
  39. Mind and Matter as Asymptotically Disjoint, Inequivalent Representations with Broken Time-Reversal Symmetry.Harald Atmanspacher - manuscript
    body. While the latter areas are discussed mainly in fields such as the philosophy of mind, cognitive Many philosophical and scientific discussions of top-.
     
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  40. Is Classical Mechanics Time Reversal Invariant?Steven F. Savitt - 1994 - British Journal for the Philosophy of Science 45 (3):907-913.
  41.  28
    Discussion: Malament on Time Reversal.Stephen Leeds - 2006 - Philosophy of Science 73 (4):448-458.
  42. Measurements and Time Reversal in Objective Quantum Theory.F. J. Belinfante - 1979 - British Journal for the Philosophy of Science 30 (2):187-191.
     
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  43.  11
    Classification of Task Type and Reaction Time of Operator in Simulated Multiple Robot Tele-Exploration.Hemanth Manjunatha, Amir Memar & Ehsan Esfahani - 2018 - Frontiers in Human Neuroscience 12.
  44.  65
    Communication and Time Reversal.Murray Macbeath - 1983 - Synthese 56 (1):27 - 46.
  45.  36
    Time Reversal, Information Theory, and "World-Geometry".C. T. K. Chari - 1963 - Journal of Philosophy 60 (20):579-583.
  46.  7
    Perceptual Restoration of Temporally Distorted Speech in L1 Vs. L2: Local Time Reversal and Modulation Filtering.Mako Ishida, Takayuki Arai & Makio Kashino - 2018 - Frontiers in Psychology 9.
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  47.  7
    A Modified Time Reversal Method for Guided Wave Detection of Bolt Loosening in Simulated Thermal Protection System Panels.Guan-nan Wu, Chao Xu, Fei Du & Wei-Dong Zhu - 2018 - Complexity 2018:1-12.
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  48. ELINFANTE, F. J.: "Measurements and Time Reversal in Objective Quantum Theory". [REVIEW]Harvey R. Brown - 1979 - British Journal for the Philosophy of Science 30:187.
  49.  15
    Roads to the Past: How to Go and Not to Go Backward in Time in Quantum Theories.Cristian López - 2019 - European Journal for Philosophy of Science 9 (2):27.
    In this article I shall defend, against the conventional understanding of the matter, that two coherent and tenable approaches to time reversal can be suitably introduced in standard quantum mechanics: an “orthodox” approach that demands time reversal to be represented in terms of an anti-unitary and anti-linear time-reversal operator, and a “heterodox” approach that represents time reversal in terms of a unitary, linear time-reversal operator. The rationale shall be (...)
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  50.  2
    Roads to the Past: How to Go and Not to Go Backward in Time in Quantum Theories.Cristian López - 2019 - European Journal for Philosophy of Science 9 (2):27.
    In this article I shall defend, against the conventional understanding of the matter, that two coherent and tenable approaches to time reversal can be suitably introduced in standard quantum mechanics: an “orthodox” approach that demands time reversal to be represented in terms of an anti-unitary and anti-linear time-reversal operator, and a “heterodox” approach that represents time reversal in terms of a unitary, linear time-reversal operator. The rationale shall be (...)
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