Search results for "miR"
showing 10 items of 1117 documents
Trapping cold atoms using surface-grown carbon nanotubes
2008
We present a feasibility study for loading cold atomic clouds into magnetic traps created by single-wall carbon nanotubes grown directly onto dielectric surfaces. We show that atoms may be captured for experimentally sustainable nanotube currents, generating trapped clouds whose densities and lifetimes are sufficient to enable detection by simple imaging methods. This opens the way for a different type of conductor to be used in atomchips, enabling atom trapping at submicron distances, with implications for both fundamental studies and for technological applications.
Dynamical Casimir-Polder interaction between a chiral molecule and a surface
2016
We develop a dynamical approach to study the Casimir-Polder force between a initially bare molecule and a magnetodielectric body at finite temperature. Switching on the interaction between the molecule and the field at a particular time, we study the resulting temporal evolution of the Casimir-Polder interaction. The dynamical self-dressing of the molecule and its population-induced dynamics are accounted for and discussed. In particular, we find that the Casimir-Polder force between a chiral molecule and a perfect mirror oscillates in time with a frequency related to the molecular transition frequency, and converges to the static result for large times.
Dispersive interactions between atoms and nonplanar surfaces
2009
We calculate the dispersive force between a ground state atom and a non planar surface. We present explicit results for a corrugated surface, derived from the scattering approach at first order in the corrugation amplitude. A variety of analytical results are derived in different limiting cases, including the van der Waals and Casimir-Polder regimes. We compute numerically the exact first-order dispersive potential for arbitrary separation distances and corrugation wavelengths, for a Rubidium atom on top of a silicon or gold corrugated surface. We discuss in detail the inadequacy of the proximity force approximation, and present a simple but adequate approximation for computing the potentia…
Apgādnieka zaudējuma pensijas piešķiršanas problēmas un iespējamie risinājumi
2016
Apgādnieka zaudējuma pensijas regulējumu Latvijā nosaka likums ”Par valsts pensijām”. Tās apjomu ietekmē mirušā apgādnieka iespējamā vecuma pensija un apgādājamo skaits, kam tiek piešķirta apgādnieka zaudējuma pensija. Pētījuma mērķis ir analizējot būtiskākās problēmas apgādnieka zaudējuma pensijas piešķiršanas un aprēķināšanas kārtībā, izstrādāt ieteikumus normatīvo aktu pilnveidošanā un sociālekonomiskās nevienlīdzības mazināšanā. Lai sasniegtu šo mērķi, autors analizēja likuma ”Par valsts pensijām” regulējumu, apkopoja Centrālās statistikas pārvaldes datus, salīdzināja Latvijas regulējumu ar citām valstīm, izzināja eksperta viedokli un apkopoja vairāku personu viedokļus, kuri ir saskāruš…
Revision of the plant bug genus Xenocylapus Bergroth (Hemiptera: Heteroptera: Miridae: Cylapinae), with a description of Henryfulvius gracilis – a ne…
2014
SummaryThe genus Xenocylapus Bergroth, 1922 is revised. Nine new species, Xenocylapus aculeatus sp. nov., X. aquilonius sp. nov., X. bicolor sp. nov., X. globulus sp. nov., X. heissi sp. nov., X. panamaensis sp. nov., X. serrulatus sp. nov., X. tenuis sp. nov., and X. waorani sp. nov., are described from Brazil, Honduras, Mexico, and Panama. New genus and species Henryfulvius gracilis gen. nov., sp. nov. is described from Ecuador. Illustrations of the male genitalia, color photographs of dorsal and lateral views of the adult of most species, scanning electron micrographs of selected structures of X. tenuis, and keys to species of the genus Xenocylapus are provided.
<p><strong>Revision of the plant bug genus <em>Cylapocoris</em> Carvalho (Hemiptera: Heteroptera: Miridae: Cylapinae), with d…
2013
The plant bug genus Cylapocoris Carvalho, 1954 is revised. Seven new species: Cylapocoris costaricaensis sp. nov., C. cucullatus sp. nov., C. fulvus sp. nov., C. laevigatus sp. nov., C. marmoreus sp. nov., C. plectipennis sp. nov., and C. simplex sp. nov. are described from Costa Rica, Brazil, Ecuador, and Venezuela. The genus Adcylapocoris Carvalho, 1989 is synonymized with Cylapocoris . Five species: C. castaneus (Carvalho, 1989), C. funebris (Distant, 1883), C. pilosus Carvalho, 1954 , C. sulinus Carvalho & Gomes 1971 , and C. tiquiensis Carvalho, 1954 are redescribed. Illustrations of the male genitalia, color pho-tographs of dorsal and lateral views of the adult of most species, scanni…
Grasslands and Shrublands of Kazakhstan and Middle Asia
2020
Kazakhstan and Middle Asia comprise 4 million km2 of plains, uplands and tall mountain ranges in the core of the Eurasian continent. The region’s semi-arid climate, grazing pressure by wild and domestic ungulates, and long pastoral tradition, have given rise to a variety of open habitat types and a distinct flora and fauna. Grasslands and shrublands are a natural and dominant vegetation type in the forest-steppe and steppe zone of northern and central Kazakhstan, as part of the Eurasian grassland biome. In Middle Asia, grasslands and shrublands are widespread habitat types in the Tian Shan, Pamir-Alai and Pamir—mountain systems that have been recently acknowledged as a global biodiversity h…
Syntaxonomy and ecology of mesophilous scrub vegetation in Tajikistan (Middle Asia)
2022
Aims: In this paper we propose the first syntaxonomic classification for the mesophilous scrub vegetation in Tajikistan with some remarks on their environmental variability. Methods: Altogether 120 relevés were sampled using the standard, seven-degree cover-abundance scale of Braun-Blanquet, in 2015–2021. They were classified by the modified TWINSPAN method using the four step interval scale with cutoff levels of 0%, 2%, 5% and 10% and total inertia as a measure of cluster heterogeneity. Diagnostic species were identified using the phi coefficient as a fidelity measure. Detrended Correspondence Analysis (DCA) was used to determine the relationship between the sampled plots, vegetation units…
Latvijas purvu veģetācijas klasifikācija un dinamika
1998
Rakstu krājumā apkopoti pēdējo gadu Latvijas purvu un ezeru krastu veģetācijas pētījumu rezultāti. Analizēti Teiču purva veidošanās apstākļi pēc putekšņu diagrammām. Publicētas purvu augu sabiedrību sintaksonomijas shēmas un sinoptiskās tabulas.
Pasión, eternidad del instante. El oscuro hechizo de la noche de San Juan engullido en el abismo del vértigo
2007
Mircea Eliade, conocido por su ingente obra como historiador de las religiones, posee también una amplia producción como autor de ficción, que está íntimamente ligada a sus trabajos religiológicos y que escribió siempre en su lengua materna: el rumano. “La noche de San Juan”, aparecida en primer lugar en traducción francesa en 1955 con el título de “Fôret interdite” (“El bosque prohibido”) y ya en 1971 en rumano como “La noche de San Juan”, es la más ambiciosa y personal de las narraciones de Eliade, especialmente querida por su autor. El texto que aquí presentamos analiza el motivo del doble, esencial en la novela, comparando su importancia en ella con el papel que desempeña en “Vértigo”, …