7,699 research outputs found
Gluon structure function for deeply inelastic scattering with nucleus in QCD
In this talk we present the first calculation of the gluon structure function
for nucleus in QCD. We discuss the Glauber formula for the gluon structure
function and the violation of this simple approach that we anticipate in QCD.
(Talk given by E. Levin at QCD and nuclear target session at the Workshop on
Deep Inelastic Scattering and QCD, Paris, April 1995).Comment: 10 pages(latex file),4 fig (eps.files
Gluon density in nuclei
In this talk we present our detail study ( theory and numbers) [1] on the
shadowing corrections to the gluon structure functions for nuclei. Starting
from rather contraversial information on the nucleon structure function which
is originated by the recent HERA data, we develop the Glauber approach for the
gluon density in a nucleus based on Mueller formula [2] and estimate the value
of the shadowing corrections in this case. Than we calculate the first
corrections to the Glauber approach and show that these corrections are big.
Based on this practical observation we suggest the new evolution equation which
takes into account the shadowing corrections and solve it. We hope to convince
you that the new evolution equation gives a good theoretical tool to treat the
shadowing corrections for the gluons density in a nucleus and, therefore, it is
able to provide the theoretically reliable initial conditions for the time
evolution of the nucleus - nucleus cascade.Comment: Talk at RHIC'96, 43 pages, 23 figure
An Archaeological Investigation into the Cluskey Embankment Stores
Between November 2012 and June 2013 Georgia Southern University conducted an archaeological investigation into the Cluskey Embankment Stores (9CH1352) on behalf of the City of Savannah, Georgia. The project was first initiated by the Earl T. Shinhoster Youth Leadership Institute over a concern of how the vaults were being used. Members of the Shinhoster organization went before City Council and proposed an archaeological investigation of the Vaults. The City Council supported to the proposal and the City’s Research Library & Municipal Archives contacted Dr. Sue Moore of Georgia Southern University to conduct an archaeological investigation of the site. The Cluskey Embankment Stores are located on Factor’s Walk just east of City Hall in Savannah, Georgia. There are a total of five vaults with four open and a fifth vault bricked up and sealed. The research goal was to determine what the vaults were used for and if they were, in fact, utilized as slave holding facilities. The scope of work conducted on the vaults included extensive archival research, LiDAR scanning, GPR scanning, and excavation units in all four open vaults with a reconnaissance into the fifth vault. All of these tasks were led by Dr. Sue Moore and Blake Ayala
Scaling violation and shadowing corrections at HERA
We study the value of shadowing corrections (SC) in HERA kinematic region in
Glauber - Mueller approach. Since the Glauber - Mueller approach was proven in
perturbative QCD in the double logarithmic approximation (DLA), we develop the
DLA approach for deep inelastic structure function which takes into account the
SC. Our estimates show small SC for in HERA kinematic region while they
turn out to be sizable for the gluon structure function. We compare our
estimates with those for gluon distribution in leading order (LO) and next to
leading order (NLO) in the DGLAP evolution equations.Comment: 9pp,6 figures in eps file
Quantitative trait loci mapping reveals candidate pathways regulating cell cycle duration in \u3cem\u3ePlasmodium falciparum\u3c/em\u3e
Background: Elevated parasite biomass in the human red blood cells can lead to increased malaria morbidity. The genes and mechanisms regulating growth and development of Plasmodium falciparum through its erythrocytic cycle are not well understood. We previously showed that strains HB3 and Dd2 diverge in their proliferation rates, and here use quantitative trait loci mapping in 34 progeny from a cross between these parent clones along with integrative bioinformatics to identify genetic loci and candidate genes that control divergences in cell cycle duration. Results: Genetic mapping of cell cycle duration revealed a four-locus genetic model, including a major genetic effect on chromosome 12, which accounts for 75% of the inherited phenotype variation. These QTL span 165 genes, the majority of which have no predicted function based on homology. We present a method to systematically prioritize candidate genes using the extensive sequence and transcriptional information available for the parent lines. Putative functions were assigned to the prioritized genes based on protein interaction networks and expression eQTL from our earlier study. DNA metabolism or antigenic variation functional categories were enriched among our prioritized candidate genes. Genes were then analyzed to determine if they interact with cyclins or other proteins known to be involved in the regulation of cell cycle. Conclusions: We show that the divergent proliferation rate between a drug resistant and drug sensitive parent clone is under genetic regulation and is segregating as a complex trait in 34 progeny. We map a major locus along with additional secondary effects, and use the wealth of genome data to identify key candidate genes. Of particular interest are a nucleosome assembly protein (PFL0185c), a Zinc finger transcription factor (PFL0465c) both on chromosome 12 and a ribosomal protein L7Ae-related on chromosome 4 (PFD0960c)
Chiral fermion mass and dispersion relations at finite temperature in the presence of hypermagnetic fields
We study the modifications to the real part of the thermal self-energy for
chiral fermions in the presence of a constant external hypermagnetic field. We
compute the dispersion relation for fermions occupying a given Landau level to
first order in g'^2, g^2 and g_phi^2 and to all orders in g'B, where g' and g
are the U(1)_Y and SU(2)_L couplings of the standard model, respectively, g_phi
is the fermion Yukawa coupling, and B is the hypermagnetic field strength. We
show that in the limit where the temperature is large compared to sqrt{g'B},
left- and right-handed modes acquire finite and different B-dependent masses
due to the chiral nature of their coupling with the external field. Given the
current bounds on the strength of primordial magnetic fields, we argue that the
above is the relevant scenario to study the effects of magnetic fields on the
propagation of fermions prior and during the electroweak phase transition.Comment: 11 pages 4 figures, published versio
Registro, aplicación y pago del impuesto sobre la renta (IR) en Inversiones Agropecuarias S.A de Matagalpa durante el año 2015
El presente Seminario de Graduación para optar al TÃtulo de Licenciatura en Contabilidad Pública y Finanzas contiene como lÃnea de principal de investigación y tema el Impuesto sobre la renta (IR) en las empresas de los departamentos de Matagalpa, Managua y Jinotega en el año 2015.
El Subtema es Registro, aplicación y pago del impuesto sobre la Renta (IR) en Inversiones Agropecuarias S.A de Matagalpa durante el año 2015, cuya empresa es cafetalera dedica a la venta de Café en el extranjero.
El objetivo del estudio es determinar la importancia de la correcta aplicación de los registros, aplicación y pago de Impuesto sobre la Renta (IR) basados en la ley 822, Ley de Concertación Tributaria vigente en la republica de Nicaragua.
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Para el gremio contable que será alimentado por esta graduación es importancia analizar el Impuesto sobre la Renta IR en la ejecución de las sociedades anónimas ya que esto constituye un eje fundamental de las declaratorias de impuesto anuales a los cuales están obligados a declarar al finalizar el Periodo Fiscal.
Basado en el estudio, la aplicación de instrumentos de investigación y la revisión documental se ha llegado a la conclusión principal de que Inversiones Agropecuarias S.A, está presentando las declaraciones de impuesto conforme a lo establecido en la ley 822, Ley de Concertación Tributari
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