89,393 research outputs found
Charge resolved electrostatic diagnostic of colliding copper laser plasma plumes
Get PDFThe collision of two laser generated plasma plumes can result, under appropriate conditions, in the formation of ‘stagnation layer’. The processes underlying this phenomenon are complex and time dependent. The majority of experiments over the last few decades have focused upon spectroscopic diagnostic of colliding plasmas. We have performed electrostatic diagnosis of multiply charged copper ions (Cu+ to Cu5+) generated via Q-switched pulsed laser (λ=1.06 μm, τ=6 ns, EL=52-525 mJ) generation of copper plasma plumes from a planar target. Time dependent current traces, charge yields and kinetic energy (Ke) distributions are obtained for single plasma plumes (Sp) and colliding plasma plumes (Cp). The charge yield from a Cp relative to twice that from a Sp is characterized by a charge yield ratio (CYR) parameter. Superior ion yields for all charge states occur for a discrete range of fluences (F) from colliding plasma plumes leading to a CYR parameter exceeding unity. The kinetic energy distributions from colliding plasma plumes display well defined energy compression via narrowing of the distributions for all fluences and charge states. The extent of this energy compression is charge dependent. Space charge forces within the stagnation layer and the resulting charge dependent acceleration of ions is proposed to account for the transfer of ion kinetic energy in favour of collisional ionization mechanisms.Higher Education AuthorityScience Foundation IrelandEnterprise Irelandti, sp, ab, li - TS 24.04.1
Oeuvres de Jean Racine.
No full textError in pagination, v. 1: 231 numbered 232.t. 1. Notice sur la vie et les ouvrages de Racine. La Thébaïde, ou, Les frères ennemis. Alexandre. Andromaque. Les plaideurs.--t. 2. Britannicus. Bérénice. Bajazet. Mithridate.--t. 3. Iphigénie. Phedre. Esther. Athalie.--t. 4. Oeuvres diverses en vers et en prose. Abrégé de l'histoire de Port-Royal.--t. 5. Ouvrages attribuésà Racine. Lettres de J. Racine.Mode of access: Internet
Constraints on large-scale dark acoustic oscillations from cosmology
Get PDFIf all or a fraction of the dark matter (DM) were coupled to a bath of dark radiation (DR) in the early Universe, we expect the combined DM-DR system to give rise to acoustic oscillations of the dark matter until it decouples from the DR. Much like the standard baryon acoustic oscillations, these dark acoustic oscillations (DAO) imprint a characteristic scale, the sound horizon of dark matter, on the matter power spectrum. We compute in detail how the microphysics of the DM-DR interaction affects the clustering of matter in the Universe and show that the DAO physics also gives rise to unique signatures in the temperature and polarization spectra of the cosmic microwave background (CMB). We use cosmological data from the CMB, baryon acoustic oscillations, and large-scale structure to constrain the possible fraction of interacting DM as well as the strength of its interaction with DR. Like nearly all knowledge we have gleaned about DM since inferring its existence this constraint rests on the betrayal by gravity of the location of otherwise invisible DM. Although our results can be straightforwardly applied to a broad class of models that couple dark matter particles to various light relativistic species, in order to make quantitative predictions, we model the interacting component as dark atoms coupled to a bath of dark photons. We find that linear cosmological data and CMB lensing put strong constraints on the existence of DAO features in the CMB and the large-scale structure of the Universe. Interestingly, we find that at most ∼5% of all DM can be very strongly interacting with DR. We show that our results are surprisingly constraining for the recently proposed double-disk DM model, a novel example of how large-scale precision cosmological data can be used to constrain galactic physics and subgalactic structure
Loiret. — Saint-Cyr-en-Val. Baille Vachère
No full textTrautmann F. Loiret. — Saint-Cyr-en-Val. Baille Vachère. In: Archéologie médiévale, tome 9, 1979. p. 143
Alien Registration- Cyr, John F. (Millinocket, Penobscot County)
Get PDFhttps://digitalmaine.com/alien_docs/7549/thumbnail.jp
Evolution and properties of self-interacting dark matter subhalos until core collapse
Get PDFOne of the hottest questions in the cosmology of self-interacting dark matter (SIDM) is whether scatterings can induce detectable core-collapse in halos by the present day. Because gravitational tides can accelerate core-collapse, the most promising targets to observe core-collapse are satellite galaxies and subhalo systems. However, simulating small subhalos is computationally intensive, especially when subhalos start to core-collapse. In this work, we present a hierarchical framework for simulating a population of SIDM subhalos, which reduces the computation time to linear order in the total number of subhalos. With this method, we simulate substructure lensing systems with multiple velocity-dependent SIDM models and show how subhalo evolution depends on the SIDM model, subhalo mass and orbits. We find that an SIDM cross section of ≳200 cm2/g at velocity scales relevant for subhalos' internal heat transfer is needed for a significant fraction of subhalos to core-collapse in a typical lens system at redshift z=0.5 and that core-collapse has unique observable features in lensing. We show quantitatively that core-collapse in subhalos is typically accelerated compared to field halos, except when the SIDM cross section is non-negligible (≳O(1) cm2/g) at subhalos' orbital velocities, in which case evaporation by the host can delay core-collapse. This suggests that substructure lensing can be used to probe velocity-dependent SIDM models, especially if line-of-sight structures (field halos) can be distinguished from lens-plane subhalos. Intriguingly, we find that core-collapse in subhalos can explain the recently reported ultrasteep density profiles of substructures found by lensing with the Hubble Space Telescope
F. Gaboriau, Le thème biblique de la connaissance. Etude d'une racine, 1969
No full textMénard Jacques E. F. Gaboriau, Le thème biblique de la connaissance. Etude d'une racine, 1969. In: Revue des Sciences Religieuses, tome 45, fascicule 4, 1971. p. 382
Ouverture // L'hospice du Mont Bernard
No full textTitre uniforme : Cherubini, Luigi (1760-1842). Compositeur. [Eliza. Ouverture]Titre propre pris à la partie de violino primo. - Livret de Réverony Saint-Cyr. - 1re représentation : Paris, Théâtre Feydeau, 13 décembre 1794. - Parties instrumentales : violino primo (8 f. ), violino secondo (9 f.), alto viola (10 f. ), basso (8 f.), fagotti (5 f.), trompettes [1 et 2 en accolade] (4 f.), trombonne basse (2 f.). - Date sur encart joint : 1 juillet 1823. - Papier légèrement bleuté. - Éd. : Paris : Imprimerie du Conservatoire, [s.d.]Présentation musicale : [Parties]Appartient à l’ensemble documentaire : RISM2Appartient à l’ensemble documentaire : RISMMssOuvertures (musique) -- +* 1700......- 1799......+:18e siècle:Opéras -- +* 1700......- 1799......+:18e siècle
Tracking Animals in a Dynamic Environment: Remote Sensing Image Time Series, Spatial Database for GPS Wildlife Tracking Data
No full textThis chapter looks into the spatiotemporal dimension of both animal tracking data sets and the dynamic environmental data that can be associated with them. Typically, these geographic layers derive from remote sensing measurements, commonly those collected by sensors deployed on earth-orbiting satellites, which can be updated on a monthly, weekly or even daily basis. The modelling potential for integrating these two levels of ecological complexity (animal movement and environmental variability) is huge and comes from the possibility to investigate processes as they build up, i.e. in a full dynamic framework. This chapter’s exercise will describe howto integrate dynamic environmental data in the spatial database and join to animal locations one of the most used indices for ecological productivity and phenology, the normalised difference vegetation index (NDVI) derived from MODI
F. C. de Sumichrast, Athaliah, a tragedy, drawn from holy scripture by Jean Racine, translated into English, Cambridge, 1897
No full textSouriau Maurice. F. C. de Sumichrast, Athaliah, a tragedy, drawn from holy scripture by Jean Racine, translated into English, Cambridge, 1897. In: Revue internationale de l'enseignement, tome 36, Juillet-Décembre 1898. p. 281
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