246 research outputs found
Time evolution of two distant SUID rings irradiated with entangled electromagnetic fields
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Waving goodbye? : the determinants of autonomism and secessionism in Western Europe
No full textFirst published online: 24 March 2017Waving goodbye? The determinants of autonomism and secessionism in Western Europe. Regional Studies. This paper sheds light on the main aggregate-level determinants of electoral support for regionalist parties across 10 Western European countries. A region being relatively richer than the country to which it belongs is associated with higher electoral support for regionalist parties only to the extent that the region is culturally differentiated. This hypothesis is substantiated theoretically, tested empirically and found to hold in the form of a strong and significant interaction effect between cultural and economic variables. This result, omitted in previous studies, implies a profound change in the interpretation of the role of income and cultural differences in explaining support for regionalism, for both autonomist and separatist parties
Plasma directed assembly and organization: bottom-up nanopatterning using top-down technology
No full textFabrication of periodic nanodot or nanocolumn arrays on surfaces is performed by top-down lithographic procedures or bottom-up self-assembly methods, which both make use of plasma etching to transfer the periodic pattern. Could plasma etching alone act as an assembly–organization method to create the pattern and then transfer it to the substrate? We present data that support this idea and propose a mechanism of periodicity formation where etching and simultaneous deposition take place
Subsystems of a finite quantum system and Bell-like inequalities
No full textYesThe set of subsystems Sigma(m) of a finite quantum system Sigma(n) with variables in Z(n) together with logical connectives, is a Heyting algebra. The probabilities tau(m vertical bar rho(n)) Tr vertical bar B(m)rho(n)] (where B(m) is the projector to Sigma(m)) are compatible with associativity of the join in the Heyting algebra, only if the variables belong to the same chain. Consequently, contextuality in the present formalism, has the chains as contexts. Various Bell-like inequalities are discussed. They are violated, and this proves that quantum mechanics is a contextual theory
Time evolution of two distant squid rings irradiated with entangled electromagnetic field
No full textGrothendieck bound in a single quantum system
No full textYesGrothendieck's bound is used in the context of a single quantum system, in contrast to previous work which used it for multipartite entangled systems and the violation of Bell-like inequalities. Roughly speaking the Grothendieck theorem considers a 'classical' quadratic form that uses complex numbers in the unit disc, and takes values less than 1. It then proves that if the complex numbers are replaced with vectors in the unit ball of the Hilbert space, then the 'quantum' quadratic form might take values greater than 1, up to the complex Grothendieck constant . The Grothendieck theorem is reformulated here in terms of arbitrary matrices (which are multiplied with appropriate normalisation prefactors), so that it is directly applicable to quantum quantities. The emphasis in the paper is in the 'Grothendieck region' , which is a classically forbidden region in the sense that cannot take values in it. Necessary (but not sufficient) conditions for taking values in the Grothendieck region are given. Two examples that involve physical quantities in systems with six and 12-dimensional Hilbert space, are shown to lead to in the Grothendieck region . They involve projectors of the overlaps of novel generalised coherent states that resolve the identity and have a discrete isotropy
Renormalization of total sets of states into generalized bases with a resolution of the identity
No full textYesA total set of states for which we have no resolution of the identity (a `pre-basis'), is considered
in a finite dimensional Hilbert space. A dressing formalism renormalizes them into density matrices
which resolve the identity, and makes them a `generalized basis', which is practically useful. The
dresssing mechanism is inspired by Shapley's methodology in cooperative game theory, and it uses
Mobius transforms. There is non-independence and redundancy in these generalized bases, which is
quantifi ed with a Shannon type of entropy. Due to this redundancy, calculations based on generalized
bases, are sensitive to physical changes and robust in the presence of noise. For example, the
representation of an arbitrary vector in such generalized bases, is robust when noise is inserted in
the coeffcients. Also in a physical system with ground state which changes abruptly at some value
of the coupling constant, the proposed methodology detects such changes, even when noise is added
to the parameters in the Hamiltonian of the system
Flexible organic light emitting diodes (OLEDs) based on a blue emitting polyfluorene
No full textFlexible OLEDs were demonstrated using a highly efficient blue electroluminescent polyfluorene derivative. The flexible devices were fabricated on indium tin oxide (ITO) coated polyethylene terephthalate (PET) substrates with a sheet resistance of 35 Ω per sq. The emitting layer was poly[9,9-di-(2′-ethylhexyl)fluorenyl-2,7-diyl] (PF). A significant improvement of the luminance and device efficiency was achieved by confining the exciton formation zone within PF by two wide band-gap materials, namely PVK as a hole transport layer (HTL) and an inorganic oxide layer (IOL) as an electron transport and hole blocking layer. In order to achieve full-color LEDs based on a common host material, we probed the use of suitable dye emitters dispersed in PF at appropriate concentrations. The selection of the emitters is based on their capability to be effective energy transfer acceptors from the blue emitting PF. In particular, energy transfer was demonstrated from blue to green for PF-doped with the green dye emitter 1-[4-(dimethylamino)phenyl]-6- phenylhexa-1,3,5,-triene (DMA-DPH), and from blue to red for PF-doped with the red dye emitter (4-dimethylamino-4′-nitrostilbene) (DANS). This demonstration paves the way for developing highly efficient blue, green and red flexible OLEDs based on a common blue emitting PF host.</p
Analytic representation of quantum systems
No full textFinite quantum systems with d-dimension Hilbert space, where position x and
momentum p take values in Zd(the integers modulo d) are studied. An analytic
representation of finite quantum systems, using Theta function is considered.
The analytic function has exactly d zeros. The d paths of these zeros on the
torus describe the time evolution of the systems. The calculation of these
paths of zeros, is studied. The concepts of path multiplicity, and path winding
number, are introduced. Special cases where two paths join together, are also
considered. A periodic system which has the displacement operator to real
power t, as time evolution is also studied.
The Bargmann analytic representation for infinite dimension systems, with
variables in R, is also studied. Mittag-Leffler function are used as examples of
Bargmann function with arbitrary order of growth. The zeros of polynomial
approximations of the Mittag-Leffler function are studied.Libyan Cultural Affair
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