67,481 research outputs found
PQCD Analysis of Parton-Hadron Duality
We propose an extraction of the running coupling constant of QCD in the
infrared region from experimental data on deep inelastic inclusive scattering
at Bjorken x -> 1. We first attempt a perturbative fit of the data that extends
NLO PQCD evolution to large x values and final state invariant mass, W, in the
resonance region. We include both target mass corrections and large x
resummation effects. These effects are of order O(1/Q^2), and they improve the
agreement with the Q^2 dependence of the data. Standard analyses require the
presence of additional power corrections, or dynamical higher twists, to
achieve a fully quantitative fit. Our analysis, however, is regulated by the
value of the strong coupling in the infrared region that enters through large x
resummation effects, and that can suppress, or absorb, higher twist effects.
Large x data therefore indirectly provide a measurement of this quantity that
can be compared to extractions from other observables.Comment: 10 pages, 3 figure
Digital simulation for post-docking response
The digital program, 2BODY, which simulates the translational and rotational motion of two connected rigid bodies and provides both digital and plot output is described. Relative rotation of the bodies at the connection is allowed, thereby providing a model suitable for studying system stability and response during a soft-dock regime. A users manual for the program is given as well as all the details and background pertaining to the equations of motion and mathematical models, integration scheme, and input/output routines
A Remark on Quantum Group Actions and Nuclearity
Let H be a compact quantum group with faithful Haar measure and bounded
counit. If H acts on a C*-algebra A, we show that A is nuclear if and only if
its fixed-point subalgebra is nuclear. As a consequence H is a nuclear
C*-algebra.Comment: 12 pages, LateX 2
An Expansion Term In Hamilton's Equations
For any given spacetime the choice of time coordinate is undetermined. A
particular choice is the absolute time associated with a preferred vector
field. Using the absolute time Hamilton's equations are
+ (\delta H_{c})/(\delta \pi)=\dot{q}\Theta = V^{a}_{.;a}N\equiv exp(-\int\Theta d \ta)\pi^{N}\pi^N$. Briefly the possibility of a non-standard sympletic form
and the further possibility of there being a non-zero Finsler curvature
corresponding to this are looked at.Comment: 10 page
Two Trapping Systems to Determine Incidence and Duration of Migration of Adult Alfalfa Weevils, \u3ci\u3eHypera Postica\u3c/i\u3e (Coleoptera: Curculionidae)
Emergence and flight traps were used to study the pre- and post-diapause movements of the alfalfa weevil, Hypera postica. The emergence traps proved to be an excellent tool in determining the time of diapause termination and in providing an accurate accounting of the number of weevils per unit area in aestivation sites. The flight traps showed when diapause flights to and from alfalfa fields took place. Both trapping systems can be utilized in a pest control program to locate more closely where the alfalfa weevil aestivates and when diapause related movements occur
Recent Progress in Parton Distributions and Implications for LHC Physics
I outline some of the most recent developments on the global fit to parton
distributions performed by the MRST collaboration.Comment: 6 pages, 7 figures. To appear in proceedings of XIII International
Workshop on Deep Inelastic Scattering, April,27 - May,1, 2005, Madison,
Wisconsin, US
Fall Termination of Aestivation and Field Dispersal of the Alfalfa Weevil (Coleoptera: Curculionidae) in Illinois
Emergence traps, flight traps, sweeping, and egg sampling were employed to determine fall termination of aestivation of the alfalfa weevil, Hypera postica, and patterns and timing of field reentry, and subsequent fall oviposition. Adult alfalfa weevils were found to terminate aestivation in wood edge field borders in mid-late October. Field reentry began in late October as a gradual process, starting at wooded field borders, with the field population equally dispersed by mid-November
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