49,267 research outputs found
Infrared Consistency of NSVZ and DRED Supersymmetric Gluodynamics
Pade approximant methods are applied to known terms of the DRED beta-
function for N = 1 supersymmetric SU(3) Yang-Mills theory. Each of the [N|M]
approximants with N + M less than or equal to 4 (M not equal to zero)
constructed from this series exhibits a positive pole which precedes any zeros
of the approximant, consistent with the same infrared-attractor pole behaviour
known to characterise the exact NSVZ beta-function. A similar Pade-approximant
analysis of truncations of the NSVZ series is shown consistently to reproduce
the geometric-series pole of the exact NSVZ beta function.Comment: LaTeX, 15 page
The mass of the black hole in LMC X-3
New high resolution, optical spectroscopy of the high mass X-ray binary LMC X-3, shows the spectral type of the donor star changes with phase due to irradition by the X-ray source. We find the spectral type is likely to be B5V, and only appears as B3V when viewing the heated side of the donor. Combining our measurements with those previously published, and taking into account the effects of X-ray irradiation, results in a value for the donor star radial velocity semi-amplitude of ~km~s. We find the mass of the black hole lies in the range
Industry-Academic Partnerships The View from the Corner Office
Industry-academic partnerships are described and discussed from the perspective of industry. Eight types of partnerships are discussed, including internships, mentoring, site visits, faculty-directed research, student research, consulting, in-class visits, and industry advisory boards. The benefits, problems, costs, motivation to participate, and advice for managing industry-academic partnerships are presented.industry partnerships, industry collaboration, internship, mentor, field trip, consulting, advisory board, Industrial Organization, Teaching/Communication/Extension/Profession, Q10, Q16,
An evaluation of potentially useful separator materials for nickel-cadmium (Ni-Cd] satellite batteries
An evaluation intended to determine the potential suitability and probable efficacy of a group of separator materials for use in nickel-cadmium (Ni-Cd) satellite batteries was carried out. These results were obtained using test procedures established in an earlier evaluation of other separator materials, some of which were used in experimental battery cells subjected to simulated use conditions. The properties that appear to be most important are: high electrolyte absorptivity, good electrolyte retention, low specific resistivity, rapid wettability and low resistance to air permeation. Wicking characteristics and wet-out time seem to be more important with respect to the initial filling of the battery with the electrolyte
Radiocarbon dates from the Oxford AMS system: archaeometry datelist 35
This is the 35th list of AMS radiocarbon determinations measured at the Oxford Radiocarbon Accelerator Unit (ORAU). Amongst some of the sites included here are the latest series of determinations from the key sites of Abydos, El Mirón, Ban Chiang, Grotte de Pigeons (Taforalt), Alepotrypa and Oberkassel, as well as others dating to the Palaeolithic, Mesolithic and later periods. Comments on the significance of the results are provided by the submitters of the material
Identities for hyperelliptic P-functions of genus one, two and three in covariant form
We give a covariant treatment of the quadratic differential identities
satisfied by the P-functions on the Jacobian of smooth hyperelliptic curves of
genera 1, 2 and 3
The Abelian Higgs Model as an Ensemble of Vortex Loops
In the London limit of the Ginzburg-Landau theory (Abelian Higgs model),
vortex dipoles (small vortex loops) are treated as a grand canonical ensemble
in the dilute gas approximation. The summation over these objects with the most
general rotation- and translation invariant measure of integration over their
shapes leads to effective sine-Gordon theories of the dual fields. The
representations of the partition functions of both grand canonical ensembles
are derived in the form of the integrals over the vortex dipoles and the small
vortex loops, respectively. By virtue of these representations, the bilocal
correlator of the vortex dipoles (loops) is calculated in the low-energy limit.
It is further demonstrated that once the vortex dipoles (loops) are considered
as such an ensemble rather than individual ones, the London limit of the
Ginzburg-Landau theory (Abelian Higgs model) with external monopoles is
equivalent up to the leading order in the inverse UV cutoff to the compact QED
in the corresponding dimension with the charge of Cooper pairs changed due to
the Debye screening.Comment: 17 pages, LaTeX2e, no figures, dedicated to Prof. Yu.A. Simonov on
the occasion of his 65-th birthday, final published version (minor
corrections, references added
Industry-Academic Partnerships – Benefit or Burden?
In an applied discipline such as agribusiness management, there are many opportunities for collaboration between academia and industry. This article highlights opportunities for industry-academic partnerships through research, sabbatical leaves, consulting, outreach, student enrichment activities, and industry advisory boards. The principal benefits and pitfalls associated with each type of collaboration are discussed along with tips for managing industry-academic partnerships.industry partnerships, industry collaboration, Industrial Organization, Teaching/Communication/Extension/Profession, Q10,
Quasi-doubly periodic solutions to a generalized Lame equation
We consider the algebraic form of a generalized Lame equation with five free
parameters. By introducing a generalization of Jacobi's elliptic functions we
transform this equation to a 1-dim time-independent Schroedinger equation with
(quasi-doubly) periodic potential. We show that only for a finite set of
integral values for the five parameters quasi-doubly periodic eigenfunctions
expressible in terms of generalized Jacobi functions exist. For this purpose we
also establish a relation to the generalized Ince equation.Comment: 15 pages,1 table, accepted for publication in Journal of Physics
Improved Quantum Hard-Sphere Ground-State Equations of State
The London ground-state energy formula as a function of number density for a
system of identical boson hard spheres, corrected for the reduced mass of a
pair of particles in a sphere-of-influence picture, and generalized to fermion
hard-sphere systems with two and four intrinsic degrees of freedom, has a
double-pole at the ultimate \textit{regular} (or periodic, e.g.,
face-centered-cubic) close-packing density usually associated with a
crystalline branch. Improved fluid branches are contructed based upon exact,
field-theoretic perturbation-theory low-density expansions for many-boson and
many-fermion systems, appropriately extrapolated to intermediate densities, but
whose ultimate density is irregular or \textit{random} closest close-packing as
suggested in studies of a classical system of hard spheres. Results show
substantially improved agreement with the best available Green-function Monte
Carlo and diffusion Monte Carlo simulations for bosons, as well as with ladder,
variational Fermi hypernetted chain, and so-called L-expansion data for
two-component fermions.Comment: 15 pages and 7 figure
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