Results 21 to 30 of about 52,157 (206)

Diversidad de aves rapaces diurnas en la Reserva de la Biosfera Selva El Ocote, Chiapas, México

Revista Mexicana de Biodiversidad, 2009
LA PÉRDIDA Y DEGRADACIÓN DE AMBIENTES NATURALES ESTÁ AFECTANDO A GRUPOS FUNCIONALES DE GRAN RELEVANCIA, COMO LAS AVES RAPACES DIURNAS. EN ESTE ESTUDIO EVALUAMOS LA VARIACIÓN ESPACIAL DE LA DIVERSIDAD DE ESTE GRUPO EN LA ZONA NÚCLEO Y DE AMORTIGUAMIENTO ...
JOSÉ LUIS RANGEL, JOSÉ RAÚL VÁZQUEZ PÉREZ, PAULA L. ENRÍQUEZ   +2 more
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From average case complexity to improper learning complexity [PDF]

, 2014
The basic problem in the PAC model of computational learning theory is to determine which hypothesis classes are efficiently learnable. There is presently a dearth of results showing hardness of learning problems. Moreover, the existing lower bounds fall
Berthet Q., Daniely A., Feige U., Vapnik V. N.   +3 more
core   +1 more source

Ensamble Sampling for Lattice Dynamics [PDF]

The 37th International Symposium on Dynamical Properties of Solids, 2019
Computational investigation of anharmonic and temperature-dependent aspects of lattice dynamics requires, among other things, replication of the conditions of thermal equilibrium. [...]
Paweł T. Jochym, Jan Łażewski
openaire   +2 more sources

A new universality class describing the insulating regime of disordered wires with strong spin-orbit scattering

, 1995
We discuss the distribution of transmission eigenvalues in the strongly localized regime in the presence of both a magnetic field and spin--orbit scattering.
Caselle, M.
core   +1 more source

Puzzlement about thermal redshift

, 1997
Discussed is the classical theoretical description of the experimentally established thermal redshift of spectral lines. Straightforward calculation of the observable spectrum from a canonical ensamble of monochromatic radiators yileds overall blueshift ...
Blatter, Clark, Combourieu, Compton, Dehn, Indebetouw, Jackson, James, Jaynes, Josephson, Jüttner, Kandpal, Kidd, Pound, Shapiro, Shapiro, Singwi, Trooster, Van Hove, Van Vleck, Vesselin I. Dimitrov, Wolf   +21 more
core   +1 more source

Transport and dynamical properties of inertial ratchets

, 2008
In this paper we discuss the dynamics and transport properties of a massive particle, in a time dependent periodic potential of the ratchet type, with a dissipative environment.
A.J. Fendrik, Armbruster, Astumian, Bier, Bier, Denisov, Duke, Ertas, Faucheux, Fendrik, Feynamnn, Flach, Harmer, Jung, L. Romanelli, Larrondo, Lindner, M.F. Carusela, Mateos, Mateos, McNamara, Mennerat-Robilliard, Popescu, Reimann, Rousselet, von Smoluchowski, Wolf, Zapata   +27 more
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Ensamble de estructuras a nivel mesoscópico: formación de trímeros no-simétricos

Revista UIS Ingenierías, 2018
El ensamble de estructuras se observa desde la escala molecular hasta la cosmológica. El ensamble de componentes discretos fundamentales puede llevar a la formación de una amplia variedad de estructuras, desde simples hasta complejas.
Andrés Arango-Restrepo, Daniel Barragán   +1 more
doaj   +1 more source

La Orquesta Sinfónica de Vientos de Boyacá 2001-2005: Reconstrucción histórica y perspectiva de los intérpretes

Páginas, 2023
El artículo presenta los resultados de investigación del proyecto La Orquesta Sinfónica de Vientos de Boyacá 2001-2005: Reconstrucción histórica y perspectiva de los intérpretes.
Karen Viviana Velásquez Merchán, Ruth Nayibe Cárdenas Soler, Adriana Marien Gutiérrez Torres, Rosa María Palencia Dotor   +3 more
doaj   +1 more source

Particle Path Correlations in a Phonon Bath

, 2003
The path integral formalism is applied to derive the full partition function of a generalized Su-Schrieffer-Heeger Hamiltonian describing a particle motion in a bath of oscillators.
Alexandrov A S, de Mello E V, De Raedt H, De Raedt H, Devreese J T, Emin D, Fehske H, Feynman R P, Firsov Y A, Haba Z, Heeger A J, Hirsch J E, Holstein T, Jeckelmann E, Kivelson S, Kleinert H, Kopidakis G, Kornilovitch P E, Lu Y, Marco Zoli, Miyasaka N, Nakahara M, Nieuwenhuizen Th M, Rashba E I, Rice M J, Romero A H, Schwinger J, Su W P, Toyozawa Y, Voulgarakis N K, Zeller R C, Zoli M, Zoli M, Zolotaryuk Y   +33 more
core   +1 more source

Symplectic tomography as classical approach to quantum systems

, 1996
By using a generalization of the optical tomography technique we describe the dynamics of a quantum system in terms of equations for a purely classical probability distribution which contains complete information about the system.Comment: 12 pages, LATEX,
Belinfante, Cahill, D'ariano, Dodonov, Gardiner, Glauber, Heisenberg, Hillery, Husimi, Madelung, Mancini, Nelson, P. Tombesi, Robertson, Robertson, Royer, S. Mancini, Schrödinger, Smithey, Sudarshan, Tatarskii, V.I. Man'ko, Vogel, Wigner   +23 more
core   +2 more sources