Construction of coherent states for physical algebraic systems

We construct a general state which is an eigenvector of the annihilation operator of the Generalized Heisenberg Algebra. We show for several systems, which are characterized by different energy spectra, that this general state satisfies the minimal set of conditions required to obtain Klauder's minimal coherent states.Comment: 15 pages, 3 figure

Effect of phonon scattering by surface roughness on the universal thermal conductance

The effect of phonon scattering by surface roughness on the thermal conductance in mesoscopic systems at low temperatures is calculated using full elasticity theory. The low frequency behavior of the scattering shows novel power law dependences arising from the unusual properties of the elastic modes. This leads to new predictions for the low temperature depression of the thermal conductance below the ideal universal value. Comparison with the data of Schwab et al. [Nature 404, 974 (2000)] suggests that surface roughness on a scale of the width of the thermal pathway is important in the experiment.Comment: 6 pages, 3 figure

Are gritty leaders happier or unhappier? It depends on how prudent they are

As the perseverant pursuit of long-term goals, grit is a sought-after resource for leaders and employees that typically results in greater success and well-being, but with potential downsides. We hypothesize that the relationship between grit in leaders and their affective well-being (AWB) via work-to-family conflict (WFC) is conditional on their self-regulatory resource of prudence. The sample comprises 102 leaders with self-, subordinate- (n = 487) and peer- (n = 838) ratings. Findings suggest that grittier and imprudent leaders experience higher WFC and lower AWB, whereas grittier and prudent leaders experience lower WFC and higher AWB. We therefore conclude that the agentic resource of grit in leaders may be either positively or negatively related to their well-being depending on their prudence. We also demonstrate that even though grit and prudence are among the suggested facets of conscientiousness, that should not prevent treating the two as resources that operate interactively.info:eu-repo/semantics/acceptedVersio

Plantas uliginosas e aquaticas do Pantanal arenoso.

Com o objetivo de apoiar projetos de pesquisa sobre plantas forrageiras e componentes bioticos de habitats (jacare, peixes), iniciou-se em 1984 o levantamento de plantas aquaticas e uliginosas de lugares umidos no leque aluvial arenoso do rio Taquari, que abrange Nhecolandia e Paiaguas no Pantanal. A Nhecolandia caracteriza-se pelas lagoas (= "baias"), e Paiaguas, pelas vazantes, ou drenagem abertas. Ambas as sub-regioes tem campos estacionalmente palustres com plantas uliginosas e aquaticas. Algumas comunidades como "pirizal", "caetezal", "taboal", "camalotal", etc, tem nomes populares em funcao das plantas dominantes. No total foram listadas 157 especies, de 108 generos e 54 familias. As familias mais numerosas sao gramineae (37 especies) e Cyperaceae (19), seguidas de Leguminosae (10), Scrophulariceae (7), Eriocaulaceae (6), Alismataceae (5), Lentibulariaceae (5), Onagraceae (5) e Polygalaceae (5).bitstream/item/41130/1/PA06.pd