104,889 research outputs found
Diabetes, Grand Rapids Restaurants and Hospitality and Tourism Research?
This work-in-progress paper outlines the instructional approach that is being used with a new Hospitality and Tourism Research course introduced into the Grand Valley State University hospitality and tourism management curriculum (Winter 2012). The course, which is at the Junior-Senior level, is intended to provide students with; an understanding of the relationship between general theory and applied research; the purposes and applications, procedures, constraints and management of applied research; and to help students compare and contrast quantitative and qualitative research. Twenty-two students have registered for the course. In the sections of this paper that follow a conceptual framework for instruction; the methods used in instruction; and how transformational learning will be assessed are outlined
NNLO contributions to jet photoproduction and determination of \alpha_s
We present the first calculation of inclusive jet photoproduction with
next-to-next-to-leading order (NNLO) contributions, obtained from a unified
threshold resummation formalism. The leading coefficients for direct
photoproduction are computed analytically. Together with the coefficients
pertinent to parton-parton scattering, they are shown to agree with those
appearing in our full next-to-leading order calculations. For hadron-hadron
scattering, numerical agreement is found with a previous calculation of jet
production at the Tevatron. We show that the direct and resolved NNLO
contributions considerably improve the description of final ZEUS data on jet
photoproduction and that the error on the determination of the strong coupling
constant is significantly reduced.Comment: 4 pages, 3 figure
Convex Hulls, Oracles, and Homology
This paper presents a new algorithm for the convex hull problem, which is
based on a reduction to a combinatorial decision problem
POLYTOPE-COMPLETENESS-COMBINATORIAL, which in turn can be solved by a
simplicial homology computation. Like other convex hull algorithms, our
algorithm is polynomial (in the size of input plus output) for simplicial or
simple input. We show that the ``no''-case of
POLYTOPE-COMPLETENESS-COMBINATORIAL has a certificate that can be checked in
polynomial time (if integrity of the input is guaranteed).Comment: 11 pages, 2 figure
On the Glauber model in a quantum representation
The Glauber model is reconsidered based on a quantum formulation of the
Master equation. Unlike the conventional approach the temperature and the Ising
energy are included from the beginning by introducing a Heisenberg-like picture
of the second quantized operators. This method enables us to get an exact
expression for the transition rate of a single flip-process
which is in accordance with the principle of detailed balance. The transition
rate differs significantly from the conventional one due to Glauber in the low
temperature regime. Here the behavior is controlled by the Ising energy and not
by the microscopic time scale.Comment: 8 page
The evolution of resistance through costly acquired immunity
We examine the evolutionary dynamics of resistance to parasites through acquired immunity. Resistance can be achieved through the innate mechanisms of avoidance of infection and reduced pathogenicity once infected, through recovery from infection and through remaining immune to infection: acquired immunity. We assume that each of these mechanisms is costly to the host and find that the evolutionary dynamics of innate immunity in hosts that also have acquired immunity are quantitatively the same as in hosts that possess only innate immunity. However, compared with resistance through avoidance or recovery, there is less likely to be polymorphism in the length of acquired immunity within populations. Long-lived organisms that can recover at intermediate rates faced with fast-transmitting pathogens that cause intermediate pathogenicity (mortality of infected individuals) are most likely to evolve long-lived acquired immunity. Our work emphasizes that because whether or not acquired immunity is beneficial depends on the characteristics of the disease, organisms may be selected to only develop acquired immunity to some of the diseases that they encounter
The Higgs Boson Mass in Split Supersymmetry at Two-Loops
The mass of the Higgs boson in the Split Supersymmetric Standard Model is
calculated, including all one-loop threshold effects and the renormalization
group evolution of the Higgs quartic coupling through two-loops. The two-loop
corrections are very small (<<1 GeV), while the one-loop threshold corrections
generally push the Higgs mass down several GeV.Comment: 17 pages. 4 figures. Improved discussion and notation. Corrected
typos. Added references. Added plots. Main results unchange
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