Parameters of the crystalline undulator and its radiation for particular experimental conditions

We report the results of theoretical and numerical analysis of the crystalline undulators planned to be used in the experiments which are the part of the ongoing PECU project [1]. The goal of such an analysis was to define the parameters (different from those pre-set by the experimental setup) of the undulators which ensure the highest yield of photons of specified energies. The calculations were performed for 0.6 and 10 GeV positrons channeling through periodically bent Si and Si$_{1-x}$Ge$_x$ crystals.Comment: 13 pages, 8 figures, submitted to SPI

EN, article personau onorific?

The microtoponymy of the zone of L’Isle-Jourdain (30 mn of Toulouse in gascon zone) is strongly marked by de the presence of EN + X which goes bauck up in the name of the owner of the farm preceded by the honorary particle EN. Es personal article, we expect that is only used in front of names of people (En Martin, En Colau, etc.). The use of EN in front of a name of job as En Gireta suggest two hypotheses: Or in En Gireta, Gireta is a name of someone derived of a name of job and can be still article at the time of the formation of the toponym. Or in En Gireta, Gireta is a name of job and it supposes that EN is reanalyzed as preposition in the meaning of “entà” in the sense of Toulouse (else’s house). Keywords : gascon of Toulouse; Occitan; honorary article; toponymy; grammaticalizacion

Die Integration englischer Lehnwörter in die samoanische Sprache : das Verhalten der englischen Konsonantenphoneme

Gegenstand dieser Arbeit sind die englischen Lehnwörter des Samoanischen, einer westpolynesischen Sprache. Als Basis der Untersuchung und Quelle des bearbeiteten Lehnwortschatzes dient das "Lexicon of foreign loan-words in the Samoan language" von Cain (1986)1. Hierbei handelt es sich um eine Auflistung der lexikalischen Entlehnungen im Samoanischen mit kurzen enzyklopädischen Erläuterungen. Ziel der vorliegenden Arbeit soll sein, die Integration der englischen Lehnwörter in die samoanische Sprache darzustellen und gegebenenfalls Regularitäten bezüglich der Assimilation an das samoanische Phoneminventar aufzuzeigen

Tres nuevos portainjertos híbridos de cítricos, su crecimiento inicial y tolerancia a diferentes condiciones de conductividad eléctrica producto de la fertilización

PósterLa selección de portainjertos en los cítricos está direccionada, entre otros objetivos, a sortear diferentes tipos de estreses ocasionados por condiciones ambientales. La salinidad, producida por fertilizantes y/o por agua de riego, que se puede estimar indirectamente por variaciones de conductividad eléctrica es uno de los principales estreses por las pérdidas en producción que ocasiona en el mundo. Tanto los efectos del estrés salino como la capacidad de las plantas de tolerarlo dependen del genotipo del portainjerto. El objetivo del trabajo fue evaluar la respuesta a diferentes niveles de conductividad eléctrica, producto de la fertilización en etapas iniciales del crecimiento, de tres nuevos híbridos de cítricos con potencial uso comercial como portainjertos.EEA Bella VistaFil: Leguizamón, Franco Maximiliano. Universidad Nacional del Nordeste. Facultad de Ciencias Agrarias; Argentina.Fil: Gaiad, José Emilio. Universidad Nacional del Nordeste. Facultad de Ciencias Agrarias; Argentina.Fil: Beltrán, Víctor Manuel. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bella Vista; ArgentinaFil: Alayón Luaces, Paula. Universidad Nacional del Nordeste. Facultad de Ciencias Agrarias; Argentina

Boletín oficial de la provincia de León: Num. 88 (24/07/1907)

Copia digital. Valladolid : Junta de Castilla y León. Consejería de Cultura y Turismo, 2011-201

Simulation of Deflection and Photon Emission of Ultra-Relativistic Electrons and Positrons in a Quasi-Mosaic Bent Silicon Crystal

A comprehensive numerical investigation has been conducted on the angular distribution and spectrum of radiation emitted by 855 MeV electron and positron beams while traversing a 'quasi-mosaic' bent silicon (111) crystal. This interaction of charged particles with a bent crystal gives rise to various phenomena such as channeling, dechanneling, volume reflection, and volume capture. The crystal's geometry, emittance of the collimated particle beams, as well as their alignment with respect to the crystal, have been taken into account as they are essential for an accurate quantitative description of the processes. The simulations have been performed using a specialized relativistic molecular dynamics module implemented in the MBN Explorer package. The angular distribution of the particles after traversing the crystal has been calculated for beams of different emittances as well as for different anticlastic curvatures of the bent crystals. For the electron beam, the angular distributions of the deflected particles and the spectrum of radiation obtained in the simulations are compared with the experimental data collected at the Mainz Microtron facility. For the positron beam such calculations have been performed for the first time. We predict significant differences in the angular distributions and the radiation spectra for positrons versus electrons.Comment: 17 pages, 9 figures. Submitted to: J. Phys. B: At. Mol. Opt. Phy

The Precipitation Imaging Package : Assessment of Microphysical and Bulk Characteristics of Snow

Remote-sensing observations are needed to estimate the regional and global impacts of snow. However, to retrieve accurate estimates of snow mass and rate, these observations require augmentation through additional information and assumptions about hydrometeor properties. The Precipitation Imaging Package (PIP) provides information about precipitation characteristics and can be utilized to improve estimates of snowfall rate and accumulation. Here, the goal is to demonstrate the quality and utility of two higher-order PIP-derived products: liquid water equivalent snow rate and an approximation of volume-weighted density called equivalent density. Accuracy of the PIP snow rate and equivalent density is obtained through intercomparison with established retrieval methods and through evaluation with colocated ground-based observations. The results confirm the ability of the PIP-derived products to quantify properties of snow rate and equivalent density, and demonstrate that the PIP produces physically realistic snow characteristics. When compared to the National Weather Service (NWS) snow field measurements of six-hourly accumulation, the PIP-derived accumulations were biased only +2.48% higher. Additionally, this work illustrates fundamentally different microphysical and bulk features of low and high snow-to-liquid ratio events, through assessment of observed particle size distributions, retrieved mass coefficients, and bulk properties. Importantly, this research establishes the role that PIP observations and higher-order products can serve for constraining microphysical assumptions in ground-based and spaceborne remotely sensed snowfall retrievals.Peer reviewe