879 research outputs found
Generalized time-dependent oscillators:results from a group-theoretical approach and their application to cosmology
Some results following from the analysis of generalized time-dependent oscillators in the framework of the Lie group theory are reviewed. Their role in treating aspects concerning the loss of coherence in cosmological models is discussed
On the Existence and Robustness of Steady Position-Momentum Correlations for Time-Dependent Quadratic Systems
We discuss conditions giving rise to stationary position-momentum correlations among quantum states in the Fock and coherent basis associated with the natural invariant for the one-dimensional time-dependent quadratic Hamiltonian operators such as the Kanai-Caldirola Hamiltonian. We also discuss some basic features such as quantum decoherence of the wave functions resulting from the corresponding quantum dynamics of these systems that exhibit no timedependence in their quantum correlations. In particular, steady statistical momentum averages are seen over well-defined time intervals in the evolution of a linear superposition of the basis states of modified exponentially damped mass systems
On classical string configurations
Equations which define classical configurations of strings in are
presented in a simple form. General properties as well as particular classes of
solutions of these equations are considered.Comment: 10 pages, Latex, no figures, trivial corrections, submitted to Modern
Physics Letters
Effect of nitrogen fertilization and fungicide application at heading on the gluten protein composition and rheological quality of wheat
Optimizing the bread-making quality properties of flour is currently one of the main
aims of the bakery industry. Therefore, this study has investigated the effects of N fertilization
and fungicide application at wheat heading on the protein content (GPC), gluten composition and
rheological properties of wheat. Field experiments were carried out in North-West Italy over a
3 year period, on a high protein cultivar of soft winter wheat. Grain samples were collected for each
agronomic treatment at four ripening timings, from the milk stage to the final combine harvesting,
and the contents of the different gluten fractions were quantified. The late N fertilization increased
the GPC (+1.2%) and dough strength (W) (+22%) as a result of a similar enhancement of all the
gluten protein fractions, while the fungicide application slightly reduced the GPC (0.3%) and
W(4%), mainly because of a dilution of the gliadin content, due to the significantly higher grain
yield (+8.6%) and thousand kernel weight (+5.5%). These agronomic practices did not modify the
gluten composition significantly, expressed as the relative ratio between the gliadins (glia) and the
high (HMW) and low (LMW) molecular weight glutenins (gs), and confirmed by the accumulation
trend of the different protein fractions during ripening. The year resulted to have the most marked
effect on the gluten protein fraction ratios and alveographic parameters. The lowest W was observed
in 2015, and although the highest GPC was recorded for the same year, the lowest gs/glia ratio was
also observed. Instead, 2016 showed the highest gs/glia and HMW-gs/LMW-gs (H/L) ratios, and
also the highest P/L value (2.2). In 2015, a slightly higher temperature during the ripening stage
resulted in a greater increase in the
-gliadin enriched fraction than the / gliadin ones, and marked
differences were noted in the rheological traits. This field experiment has highlighted the interactive
role of environmental and agronomic factors on the content and quality of gluten proteins and their
bread-making ability, thus making a further contribution to the development of an integrated crop
strategy for the cultivation of high protein wheat in humid Mediterranean areas
Quantum effects for extrinsic geometry of strings via the generalized Weierstrass representation
The generalized Weierstrass representation for surfaces in is
used to study quantum effects for strings governed by Polyakov-Nambu-Goto
action. Correlators of primary fields are calculated exactly in one-loop
approximation for the pure extrinsic Polyakov action. Geometrical meaning of
infrared singularity is discussed. The Nambu-Goto and spontaneous curvature
actions are treated perturbatively.Comment: Latex, 13 page
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