752 research outputs found
Photon - Jet Correlations and Constraints on Fragmentation Functions
We study the production of a large-pT photon in association with a jet in
proton-proton collisions. We examine the sensitivity of the jet rapidity
distribution to the gluon distribution function in the proton. We then assess
the sensitivity of various photon + jet correlation observables to the photon
fragmentation functions. We argue that RHIC data on photon-jet correlations can
be used to constrain the photon fragmentation functions in a region which was
barely accessible in LEP experiments.Comment: 23 pages, 9 figure
Influência do manejo de pastagens na produtividade da soja em ILP.
Este trabalho avaliou o impacto que a dessecação e a adubação nitrogenada na pastagem de azevém causaram na cultura da soja.Claudia Cristina Gulias Gomes, editora técnica
Higher dimensional abelian Chern-Simons theories and their link invariants
The role played by Deligne-Beilinson cohomology in establishing the relation
between Chern-Simons theory and link invariants in dimensions higher than three
is investigated. Deligne-Beilinson cohomology classes provide a natural abelian
Chern-Simons action, non trivial only in dimensions , whose parameter
is quantized. The generalized Wilson -loops are observables of the
theory and their charges are quantized. The Chern-Simons action is then used to
compute invariants for links of -loops, first on closed
-manifolds through a novel geometric computation, then on
through an unconventional field theoretic computation.Comment: 40 page
Expansion of Indecency Regulation: Presented by the Federalist Society\u27s Telecommunications Practice Group
This is a transcript of the November 10, 2005, panel discussion at the National Lawyer\u27s Convention presented by the Federalist Society\u27s Telecommunications Practice Group. The panelists debate and discuss the Federal Communications Commission\u27s ( FCC ) regulation of indecent content
Trion induced negative photoconductivity in monolayer MoS2
Optical excitation typically enhances electrical conduction and low-frequency
radiation absorption in semiconductors. We have, however, observed a pronounced
transient decrease of conductivity in doped monolayer molybdenum disulfide
(MoS2), a two-dimensional (2D) semiconductor, under femtosecond laser
excitation. In particular, the conductivity is reduced dramatically down to
only 30% of its equilibrium value with high pump fluence. This anomalous
phenomenon arises from the strong many-body interactions in the system, where
photoexcited electron-hole pairs join the doping-induced charges to form
trions, bound states of two electrons and one hole. The resultant increase of
the carrier effective mass substantially diminishes the carrier conductivity
Golem95C: A library for one-loop integrals with complex masses
We present a program for the numerical evaluation of scalar integrals and
tensor form factors entering the calculation of one-loop amplitudes which
supports the use of complex masses in the loop integrals. The program is built
on an earlier version of the golem95 library, which performs the reduction to a
certain set of basis integrals using a formalism where inverse Gram
determinants can be avoided. It can be used to calculate one-loop amplitudes
with arbitrary masses in an algebraic approach as well as in the context of a
unitarity-inspired numerical reconstruction of the integrand.Comment: 22 pages, 3 figure
Beneficiamento de sementes de trevo vermelho (Trifolium pratense L.) visando à remoção de trevo branco (Trifolium repens L.).
O objetivo deste estudo foi avaliar a eficiência técnica e econômica do processo de beneficiamento para separação de sementes de trevo branco em lotes de trevo vermelho.Edição dos anais do 20º Congresso Brasileiro de Sementes, Foz do Iguaçu
Adsorption of Small Cationic Nanoparticles onto Large Anionic Particles from Aqueous Solution: A Model System for Understanding Pigment Dispersion and the Problem of Effective Particle Density
The present study focuses on the use of copolymer nanoparticles as a dispersant for a model pigment (silica). Reversible addition-fragmentation chain transfer (RAFT) alcoholic dispersion polymerization was used to synthesize sterically stabilized diblock copolymer nanoparticles. The steric stabilizer block was poly(2-(dimethylamino)ethyl methacrylate) (PDMA) and the core-forming block was poly(benzyl methacrylate) (PBzMA). The mean degrees of polymerization for the PDMA and PBzMA blocks were 71 and 100, respectively. Transmission electron microscopy (TEM) studies confirmed a near-monodisperse spherical morphology, while dynamic light scattering (DLS) studies indicated an intensity-average diameter of 30 nm. Small-angle X-ray scattering (SAXS) reported a volume-average diameter of 29 ± 0.5 nm and a mean aggregation number of 154. Aqueous electrophoresis measurements confirmed that these PDMA71-PBzMA100 nanoparticles acquired cationic character when transferred from ethanol to water as a result of protonation of the weakly basic PDMA chains. Electrostatic adsorption of these nanoparticles from aqueous solution onto 470 nm silica particles led to either flocculation at submonolayer coverage or steric stabilization at or above monolayer coverage, as judged by DLS. This technique indicated that saturation coverage was achieved on addition of approximately 465 copolymer nanoparticles per silica particle, which corresponds to a fractional surface coverage of around 0.42. These adsorption data were corroborated using thermogravimetry, UV spectroscopy and X-ray photoelectron spectroscopy. TEM studies indicated that the cationic nanoparticles remained intact on the silica surface after electrostatic adsorption, while aqueous electrophoresis confirmed that surface charge reversal occurred below pH 7. The relatively thick layer of adsorbed nanoparticles led to a significant reduction in the effective particle density of the silica particles from 1.99 g cm(-3) to approximately 1.74 g cm(-3), as judged by disk centrifuge photosedimentometry (DCP). Combining the DCP and SAXS data suggests that essentially no deformation of the PBzMA cores occurs during nanoparticle adsorption onto the silica particles
The SM and NLO multileg working group: Summary report
This report summarizes the activities of the SM and NLO Multileg Working
Group of the Workshop "Physics at TeV Colliders", Les Houches, France 8-26
June, 2009.Comment: 169 pages, Report of the SM and NLO Multileg Working Group for the
Workshop "Physics at TeV Colliders", Les Houches, France 8-26 June, 200
Caracterização fÃsico-quÃmica e tecnológica de farinha de batata-doce biofortificada seca em diferentes temperaturas.
O objetivo foi caracterizar a farinha da polpa da batata-doce biofortificada seca em diferentes temperaturas. As batata-doce (acesso CNPH1210) biofortificada foram secas em estufa com ventilação de ar forçada, em quatro condições de temperatura: 45, 55, 65 e 75°C
- …