Heavy-ion Physics at a Fixed-Target Experiment Using the LHC Proton and Lead Beams (AFTER@LHC): Feasibility Studies for Quarkonium and Drell-Yan Production

We outline the case for heavy-ion-physics studies using the multi-TeV lead LHC beams in the fixed-target mode. After a brief contextual reminder, we detail the possible contributions of AFTER@LHC to heavy-ion physics with a specific emphasis on quarkonia. We then present performance simulations for a selection of observables. These show that $\Upsilon(nS)$, $J/\psi$ and $\psi(2S)$ production in heavy-ion collisions can be studied in new energy and rapidity domains with the LHCb and ALICE detectors. We also discuss the relevance to analyse the Drell-Yan pair production in asymmetric nucleus-nucleus collisions to study the factorisation of the nuclear modification of partonic densities and of further quarkonia to restore their status of golden probes of the quark-gluon plasma formation.Comment: 18 pages, 7 figure

Aedes albopictus arrives in Lisbon: an emerging public health threat

info:eu-repo/semantics/publishedVersio

Significant subsoil accumulation of mineral nitrogen under perennial crops in a ferralitic Amazonian upland soil: effects of land use systems and single-tree patterns.

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FIRST RECORD OF THE PRESENCE OF MANGROVE BORER SPHAEROMA PERUVIANUM RICHARDSON (ISOPODA: SPHAEROMATIDAE) IN THE GULF OF MONTIJO, PANAMA

  A field survey was carried out to investigate the presence of mangrove borers at the mouth of San Pablo River in the Gulf of Montijo, western Pacific of Panamá. Previous reports of the National Environment Authority (ANAM) indicate a high degree of root tip atrophy and breakage in young plants of red mangrove, Rhizophora mangle. Samples of roots were sawed off and examined for isopod burrow openings. Analysis revealed the presence of the eastern Pacific root-boring Sphaeroma peruvianum Richardson. The organism bore the roots and it is the likely cause of fall trees due to the lack of root support. A voucher specimen was deposited in the Smithsonian National Museum of Natural History, Washington, DC (USNM 1139603).  Se efectuó un estudio de campo con el propósito de investigar la presencia de barrenadores de mangle en la desembocadura del río San Pablo en el Golfo de Montijo, Pacífico oeste de Panamá. Informes previos de la Autoridad Nacional del Ambiente (ANAM) describen un alto grado de atrofia radicular en plantas jóvenes de Rhizophora mangle. Se recolectaron muestras de raíces en busca de evidencia de isópodos barrenadores. Los análisis revelaron la presencia de Sphaeroma peruvianum Richardson, un barrenador de mangle rojo activo en el Pacífico y reportado previamente para el golfo de Nicoya, Costa Rica. El organismo perfora las raíces y es la causa probable del colapso de los árboles por debilitamiento del soporte radicular. Se depositaron especímenes testigo en el Museo Nacional de Historia Natural Smithsonian en Washington, D.C. (USNM 1139603)

SPATIAL PATTERN OF ZOOPLANKTON BIOMASS IN THE GULF OF MONTIJO, PANAMA

  The following study analyses the spatial pattern of zooplankton biomass in a seven inshore offshore stations between Puerto Mutis and Cébaco island on October of 1997. At each station triplicates of 150 l samples were collected using a 4-stroke self priming volute pump and filtered through an 80 um plankton net. The salinity increased of 9.7 ppt at Puerto Mutis to 30.3 ppt at Gobernadora Island whereas temperature remained constant at 29.5 ºC mean. Piñas and Puerto Mutis showed lower Secchi depths whereas higher values were found near Gobernadora. Copepods and nauplios comprised 90% of the catches. Zooplankton biomass was significantly higher at Piñas station (83.3 + 5.8 mg/ mt3) whereas lower values were registered south Leones (5.10 + 2.8 mg/mt3).  Se estudiaron los patrones de distribución espacial de la biomasa del zooplancton en siete estaciones de muestreo del golfo de Montijo. El estudio se efectuó en octubre de 1997 e incluyó la recolecta de triplicados de muestras de 150 litros utilizando para ello una bomba de succión de cuatro tiempos y filtrando el material a través de una red de plankton de 80 um de diámetro de poro. La salinidad se incrementó de 9.7 ppm en puerto Mutis a 30.3 ppm en las cercanías de Gobernadora mientras que la temperatura se mantuvo constante cerca de los 29.5 ºC. Las aguas de Piñas y Puerto Mutis mostraron baja transparencia mientras que los valores más altos se registraron cerca de Gobernadora. Los copépodos y los nauplios constituyeron el 90% de las capturas mientras que los mayores y menores valores de biomasa se registraron en Piñas (83.3 + 5.8 mg/mt3 ) y el sur de Leones (5.10 + 2.8 mg/mt3)

Spatial pattern of zooplankton biomass in the gulf of Montijo. Panamá

The following study analyses the spatial pattern of zooplankton biomass in a seven inshore offshore stations between Puerto Mutis and Cébaco island on October of 1997. At each station triplicates of 150 l samples were collected using a 4-stroke self priming volute pump and filtered through an 80 um plankton net. The salinity increased of 9.7 ppt at Puerto Mutis to 30.3 ppt at Gobernadora Island whereas temperature remained constant at 29.5 ºC mean. Piñas and Puerto Mutis showed lower Secchi depths whereas higher values were found near Gobernadora. Copepods and nauplios comprised 90% of the catches. Zooplankton biomass was significantly higher at Piñas station (83.3 + 5.8 mg/ mt3) whereas lower values were registered south Leones (5.10 + 2.8 mg/mt3)

Comportamento de algumas gramíneas forrageiras em solo de pastagem degradada de Paragominas-PA.

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Photochemistry and photophysics of thienocarbazoles

Two methylated thienocarbazoles and two of their synthetic nitro-precursors have been examined by absorption, luminescence, laser flash photolysis and photoacoustic techniques. Their spectroscopic and photophysical characterization involves fluorescence spectra, fluorescence quantum yields and lifetimes, and phosphorescence spectra and phosphorescence lifetimes for all the compounds. Triplet-singlet difference absorption spectra, triplet molar absorption coefficients, triplet lifetimes, intersystem crossing S-1 similar tosimilar to--> T-1 and singlet molecular oxygen yields were obtained for the thienocarbazoles. In the case of the thienocarbazoles it was found that the lowest-lying singlet and triplet excited states, S, and T-1, are of pi,pi* origin, whereas for their precursors S-1 is n,pi*, and T-1 is pi,pi*. In both thienocarbazoles it appears that the thianaphthene ring dictates the S, T, yield, albeit there is less predominance of that ring in the triplet state of the linear thienocarbazole, which leads to a decrease in the observed Phi(T) value.info:eu-repo/semantics/publishedVersio

Limits of the energy-momentum tensor in general relativity

A limiting diagram for the Segre classification of the energy-momentum tensor is obtained and discussed in connection with a Penrose specialization diagram for the Segre types. A generalization of the coordinate-free approach to limits of Paiva et al. to include non-vacuum space-times is made. Geroch's work on limits of space-times is also extended. The same argument also justifies part of the procedure for classification of a given spacetime using Cartan scalars.Comment: LaTeX, 21 page