19,955 research outputs found
The Relevance of Information Sources on Adoption of Precision Farming Technologies by Cotton Producers
Replaced with revised version of paper 02/16/11.strategic communication, competitiveness, extension, economics of information, technology diffusion, technology supply, communication methods, knowledge management, Production Economics, Research and Development/Tech Change/Emerging Technologies, Teaching/Communication/Extension/Profession, D22, D80, D82, D83, Q12, Q16,
Energy flow observables in hadronic collisions
We present recent QCD calculations of energy flow distributions associated
with the production of jets at wide rapidity separations in high-energy hadron
collisions, and discuss the role of these observables to analyze contributions
from parton showering and from multiple parton collisions.Comment: 6 pages, 4 figures. Contribution at MPI@LHC201
Top asymmetry and the search for a light hadronic resonance in association with single top
The exchange of a light -channel flavor-changing gauge boson, \Vp, with
mass remains a leading explanation for the anomalous forward
backward asymmetry in top quark production at the Tevatron. Unlike other ideas,
including heavier -channel mediators, the light \Vp model is not easily
seen in the \mtt distribution. We advocate a more promising strategy. While
current analyses at hadron colliders may not be sensitive, we propose searching
for a resonance in association with single top that may allow discovery in
existing data. Deviations in the lepton charge asymmetry in this sample should
also be present.Comment: 5 pages, 2 figur
Identification of novel subgroup a variants with enhanced receptor binding and replicative capacity in primary isolates of anaemogenic strains of feline leukaemia virus
<b>BACKGROUND:</b>
The development of anaemia in feline leukaemia virus (FeLV)-infected cats is associated with the emergence of a novel viral subgroup, FeLV-C. FeLV-C arises from the subgroup that is transmitted, FeLV-A, through alterations in the amino acid sequence of the receptor binding domain (RBD) of the envelope glycoprotein that result in a shift in the receptor usage and the cell tropism of the virus. The factors that influence the transition from subgroup A to subgroup C remain unclear, one possibility is that a selective pressure in the host drives the acquisition of mutations in the RBD, creating A/C intermediates with enhanced abilities to interact with the FeLV-C receptor, FLVCR. In order to understand further the emergence of FeLV-C in the infected cat, we examined primary isolates of FeLV-C for evidence of FeLV-A variants that bore mutations consistent with a gradual evolution from FeLV-A to FeLV-C.<p></p>
<b>RESULTS:</b>
Within each isolate of FeLV-C, we identified variants that were ostensibly subgroup A by nucleic acid sequence comparisons, but which bore mutations in the RBD. One such mutation, N91D, was present in multiple isolates and when engineered into a molecular clone of the prototypic FeLV-A (Glasgow-1), enhanced replication was noted in feline cells. Expression of the N91D Env on murine leukaemia virus (MLV) pseudotypes enhanced viral entry mediated by the FeLV-A receptor THTR1 while soluble FeLV-A Env bearing the N91D mutation bound more efficiently to mouse or guinea pig cells bearing the FeLV-A and -C receptors. Long-term in vitro culture of variants bearing the N91D substitution in the presence of anti-FeLV gp70 antibodies did not result in the emergence of FeLV-C variants, suggesting that additional selective pressures in the infected cat may drive the subsequent evolution from subgroup A to subgroup C.<p></p>
<b>CONCLUSIONS:</b>
Our data support a model in which variants of FeLV-A, bearing subtle differences in the RBD of Env, may be predisposed towards enhanced replication in vivo and subsequent conversion to FeLV-C. The selection pressures in vivo that drive the emergence of FeLV-C in a proportion of infected cats remain to be established
Rational dialogs
Eventual consensus is the only property of a rational dialog.
Key words: dialog; rationality; agreement.
JEL classification: D83
Forward Jets and Energy Flow in Hadronic Collisions
We observe that at the Large Hadron Collider, using forward + central
detectors, it becomes possible for the first time to carry out calorimetric
measurements of the transverse energy flow due to "minijets" accompanying
production of two jets separated by a large rapidity interval. We present
parton-shower calculations of energy flow observables in a high-energy
factorized Monte Carlo framework, designed to take into account QCD logarithmic
corrections both in the large rapidity interval and in the hard transverse
momentum. Considering events with a forward and a central jet, we examine the
energy flow in the interjet region and in the region away from the jets. We
discuss the role of these observables to analyze multiple parton collision
effects.Comment: 9 pages, 5 figures. Version2: added results on azimuthal
distributions and more discussion of energy flow definition using jet
clusterin
Bayesian Persuasion
When is it possible for one person to persuade another to change her action? We consider a symmetric information model where a sender chooses a signal to reveal to a receiver, who then takes a noncontractible action that affects the welfare of both players. We derive necessary and sufficient conditions for the existence of a signal that strictly benefits the sender. We characterize sender-optimal signals. We examine comparative statics with respect to the alignment of the sender's and the receiver's preferences. Finally, we apply our results to persuasion by litigators, lobbyists, and salespeople. (JEL D72, D82, D83, K40, M31)
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