12,898 research outputs found
Inhibition of nitric oxide production in activated macrophages caused by Toxoplasma gondii infection occurs by distinct mechanisms in different mouse macrophage cell lines
Effect of Charged Scalar Loops on Photonic Decays of a Fermiophobic Higgs
Higgs bosons with very suppressed couplings to fermions ("Fermiophobic Higgs
bosons", h_f) can decay to two photons (\gamma\gamma) with a branching ratio
significantly larger than that expected for the Standard Model Higgs boson for
m_{h_f}<150 GeV. Such a particle would give a clear signal at the LHC and can
arise in the Two Higgs Doublet Model (type I) in which h_f -> \gamma\gamma is
mediated by W^+ and charged Higgs boson (H^+) loops. We show that the H^+ loops
can cause both constructive and destructive contributions with a magnitude
considerably larger than the anticipated precision in the measurement of the
photonic decay channel at future hadron and lepton colliders.Comment: 18 pages, 5 figures, clarifications added, one reference added,
accepted by Physical Review
Comparison between furrow and drip irrigation of melon in the São Francisco region.
Melon crop in the São Francisco Region, Brazil, responded differently to the method utilized for applying water.bitstream/item/182918/1/FL-00700.pd
B Physics at the Z0 Resonance
B physics results from e+ e- annihilation at the Z0 resonance are reviewed. A
vast program is summarised, including the study of B+, B0d, B0s and b baryon
lifetimes, the time dependence of B0d and B0s oscillations, the width
difference in the B0s system, and the measurements of the magnitudes of the CKM
matrix elements Vcb and Vub.Comment: 17 pages, 8 figures, presented at the UK Phenomenology Workshop on
Heavy Flavour and CP Violation, 17-22 September 200
Casca de arroz e palhada de soja na compostagem de carcaças de frango de corte.
Projeto: 03.07.09.049
Leakage Effect on J/psi Pt Distributions in Different Centrality Bins for Pb-Pb Collisions at E/A=160 GeV
A transport approach including a leakage effect for J/psi's in the transverse
phase space is used to calculate the ratios between the J/psi transverse
momentum distributions in several centrality bins for Pb-Pb collisions at E/A =
160 GeV. From the comparison with the CERN-SPS data, where the centrality is
characterized by the transverse energy Et, the leakage effect is extremely
important in the region of high transverse momentum and high transverse energy,
and both the threshold and the comover models can describe the ratio well for
all centrality bins except the most central one (Et < 100 GeV), for which the
comover model calculation is considerably better than the threshold one.Comment: 4 pages, 2 figures, REVTEX3.1, accepted for publication in Phys. Rev.
Viable tax constitutions
Taxation is only sustainable if the general public complies with it. This observation is uncontroversial with tax practitioners but has been ignored by the public finance tradition, which has interpreted tax constitutions as binding contracts by which the power to tax is irretrievably conferred by individuals to government, which can then levy any tax it chooses. However, in the absence of an outside party enforcing contracts between members of a group, no arrangement within groups can be considered to be a binding contract, and therefore the power of tax must be sanctioned by individuals on an ongoing basis. In this paper we offer, for the first time, a theoretical analysis of this fundamental compliance problem associated with taxation, obtaining predictions that in some cases point to a re-interptretation of the theoretical constructions of the public finance tradition while in others call them into question
Matching structure and bargaining outcomes in buyer–seller networks
We examine the relationship between the matching structure of a bipartite (buyer-seller) network and the (expected) shares of the unit surplus that each connected pair in this network can create. We show that in different bargaining environments, these shares are closely related to the Gallai-Edmonds Structure Theorem. This theorem characterizes the structure of maximum matchings in an undirected graph. We show that the relationship between the (expected) shares and the tructure Theorem is not an artefact of a particular bargaining mechanism or trade centralization. However, this relationship does not necessarily generalize to non-bipartite networks or to networks with heterogeneous link values
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