283 research outputs found
Strings, T-duality breaking, and nonlocality without the shortest distance
T-duality of string theory suggests nonlocality manifested as the shortest
possible distance. As an alternative, we suggest a nonlocal formulation of
string theory that breaks T-duality at the fundamental level and does not
require the shortest possible distance. Instead, the string has an objective
shape in spacetime at all length scales, but different parts of the string
interact in a nonlocal Bohmian manner.Comment: 7 pages, revised, to appear in Eur. Phys. J.
Selective extraction of intracellular components from the microalga Chlorella vulgaris by combined pulsed electric fieldâtemperature treatment
Author's accepted version (post-print).Available from 16/12/2017
Pulsed Electric Field for protein release of the microalgae Chlorella vulgaris and Neochloris oleoabundans
publishedVersionPaid Open Acces
On the Meaning of the String-Inspired Noncommutativity and its Implications
We propose an alternative interpretation for the meaning of noncommutativity
of the string-inspired field theories and quantum mechanics. Arguments are
presented to show that the noncommutativity generated in the stringy context
should be assumed to be only between the particle coordinate observables, and
not of the spacetime coordinates. Some implications of this fact for
noncomutative field theories and quantum mechanics are discussed. In
particular, a consistent interpretation is given for the wavefunction in
quantum mechanics. An analysis of the noncommutative theories in the
Schr\"odinger formulation is performed employing a generalized quantum
Hamilton-Jacobi formalism. A formal structure for noncommutative quantum
mechanics, richer than the one of noncommutative quantum field theory, comes
out. Conditions for the classical and commutative limits of these theories have
also been determined and applied in some examples.Comment: References, comments, and footnotes are included; some changes in
section
Noncommutative quantum mechanics and Bohm's ontological interpretation
We carry out an investigation into the possibility of developing a Bohmian
interpretation based on the continuous motion of point particles for
noncommutative quantum mechanics. The conditions for such an interpretation to
be consistent are determined, and the implications of its adoption for
noncommutativity are discussed. A Bohmian analysis of the noncommutative
harmonic oscillator is carried out in detail. By studying the particle motion
in the oscillator orbits, we show that small-scale physics can have influence
at large scales, something similar to the IR-UV mixing
Water requirements and single and dual crop coefficients of sugarcane grown in a tropical region, Brazil
A field experiment was conducted throughout 2009/2010 in a sugarcane field of a commercial distillery located on the coastal area of Paraiba state, Brazil. The objectives were to determine sugarcane water requirements and to test the single and dual crop coefficients by comparing the calculated values of ET with measured ones. Crop evapotranspiration was determined by field water balance, reference evapotranspiration (ETo) by the Penman-Monteith approach, while single and dual crop coefficients were computed through the standard FAO-56 methodology. The experi- mental area was cultivated with irrigation ap-plied weekly by a centre pivot system in addition to rainfall and the irrigation scheduling was based on 100% ETo. Three statistical tests, mean bias difference (MBD), normalized root mean square difference (NRMSD) and regression analysis, were used to evaluate the performance of single and dual crop coefficients. Results showed that there was a notable symmetry between ET meas- ured and ET calculated by Kc dual. The ET val- ues, calculated from Kc single, underestimated those obtained from soil water balance meas- urements by 36%
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