2,105 research outputs found
Disputatio juridica IV. De obligationibvs in genere et specie per collationem jur: civ. Sveco-Romani. In Regia Academia Christinèâ quae Aboae est. Praeside m. Michaele O. Wexionio jur: pol. & hist. professore publico, praeceptore hospite & promotore omni observantiae cultu colendo honorando. Respondente Petro Johann: Holmense publicae ventilationi proposita ad diem 7. April. 1649.
No full textInvokaatio: Annuente altissimo.Dedikaatio: Johannes Wijnbladh, Nicolaus Johannis, Andreas Bohm, Johann. Wäyler, Michael Böök, Nicolaus Petri Askelööff.Gratulaatio: Michael Wexion., Iohann. Gartzius, Olaus Jeremiae.Arkit: 1 arkintunnukseton lehti, A-C4 D1
Global existence and regularity of solutions of the nonlinear string equation
No full textBohm, Michael; Taboada, Mario. (1992). Global existence and regularity of solutions of the nonlinear string equation. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/2323
Bürgerinitiativen: politisches Engagement und moralisches Urteilen
No full textBürgerinitiativen : polit. Engagement u. moral. Urteilen / Michael Schenk ; Gerhard Bohm. - In: Moralisches Urteilen und soziale Umwelt / hrsg. von Georg Lind ... - Weinheim u.a. : Beltz, 1983. - S. 223-23
Two-particle Aharonov-Bohm effect in electronic interferometers
No full textWe review recent theoretical investigations on the two-particle Aharonov-Bohm effect and its relation to entanglement production and detection. The difficulties of the entanglement detection due to dephasing and finite temperature are discussed regarding a recent experimental realization of a two-particle Aharonov-Bohm interferometer [15]. We also discuss a theoretical proposal for a two-particle Aharonov-Bohm interferometer, which as against the finite bias setup is driven with dynamical single-electron sources allowing for the tunable production of time-bin entanglement
The reality of relations: the case from quantum physics
No full textAs far as classical physics is concerned, it is possible to trace causal relations between physical objects (i.e. particles in this case) back to intrinsic properties of these objects (such as their mass and charge). On this view, causal relations turn out to be internal instead of external relations, supervening on intrinsic properties of the relata (as proposed by Heil and Lowe). However, one can raise doubts about this view already in Newtonian mechanics. The decisive blow to this view comes from quantum physics, with Bell’s theorem proving that no dynamics based on local, intrinsic properties of quantum objects can yield the empirical predictions of quantum mechanics. Nonetheless, quantum entanglement by no means implies that we have to abandon an ontology of objects (i.e. substances such as particles) in favour of an ontology of structures (as claimed by French and Ladyman). Any of the known proposals for a quantum ontology of matter in space-time is committed to objects. However, on any of these proposals, what determines the dynamics of these objects are not local, intrinsic properties, but a global or holistic property instantiated by all the objects together – that is, a structure that takes all the objects in the universe as its relata. The view set out in this paper thus amounts to combining ontic structural realism with an ontology of objects that can be conceived as substances. This suggestion is illustrated by drawing on the ontology of quantum physics worked out by Bohm and Bell
Bound States for the Three-Dimensional Aharonov-Bohm Quantum Wire
No full textThe existence of bound states for the three-dimensional Aharonov-Bohm quantum wire, suggested by Dunne and Jaffe, is established provided the wire is thin enough. Recent results on the Aharonov-Bohm Schrödinger operator on a disk are used
Observation of Aharonov-Bohm conductance oscillations in a graphene ring
No full textWe investigate experimentally transport through ring-shaped devices etched in graphene and observe clear Aharonov-Bohm conductance oscillations. The temperature dependence of the oscillation amplitude indicates that below 1 K, the phase coherence length is comparable to or larger than the size of the ring. An increase in the amplitude is observed at high magnetic field, when the cyclotron diameter becomes comparable to the width of the arms of the ring. By measuring the dependence on gate voltage, we find that the Aharonov-Bohm effect vanishes at the charge neutrality point, and we observe an unexpected linear dependence of the oscillation amplitude on the ring conductance.Kavli Institute of NanoscienceApplied Science
Physics and intrinsic properties
No full textThe paper sketches out an ontology of physics in terms of matter being primitive stuff distributed in space and all the properties physics is committed to being dispositions that fix the temporal development of the distribution of matter in space. Whereas such properties can be conceived as intrinsic properties of particles in classical mechanics, in quantum physics, there is a holistic property or structure that relates all matter and that fixes its temporal development
Aharonov-Bohm–Type Effect for Vortices in Josephson-Junction Arrays
No full textThe dynamics of a single vortex present in a ring-shaped (Corbino geometry) two-dimensional array of low-capacity Josephson junctions is studied. The vortex is treated as a macroscopic quantum particle, whose energy levels En(Q0) are periodic functions of the externally induced gauge charge Q0 which is enclosed by the vortex, with a period 2e. This Aharonov-Bohm–type effect may manifest itself as a persistent voltage Vs = dE0(Q0)/dQ0 between interior and exterior contacts, or alternatively as Bloch oscillations. The relation with the Aharonov-Casher effect and the possibility for experimental observation are discussed.
Compactness in the ...-Neumann Problem, Magnetic Schrödinger Operators, and the Aharonov-Bohm Effect
No full textCompactness of the Neumann operator in the d-bar Neumann problem is studied for weakly pseudoconvex bounded Hartogs domains in two dimensions. A nonsmooth example is given in which condition (P) fails to hold, yet the Neumann operator is compact. The main result, in contrast, is that for smoothly bounded Hartogs domains, condition (P) is equivalent to compactness. The analyses of both compactness and condition (P) boil down to properties of the lowest eigenvalues of certain sequences of Schrodinger operators, with and without magnetic fields, parametrized by a Fourier variable resulting from the Hartogs symmetry. The nonsmooth counterexample is based on the Aharonov-Bohm phenomenon of quantum mechanics. For smooth domains, we prove that there always exists an exceptional sequence of Fourier variables for which the Aharonov-Bohm e#ect is weak. This sequence can be very sparse, so that the failure of compactness is due to a rather subtle e#ect. 1
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