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Página 13 dos resultados de 20101 itens digitais encontrados em 0.008 segundos

## ‣ Monte Carlo Protein Folding: Simulations of Met-Enkephalin with Solvent-Accessible Area Parameterizations

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 26/08/2004
Português

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Treating realistically the ambient water is one of the main difficulties in
applying Monte Carlo methods to protein folding. The solvent-accessible area
method, a popular method for treating water implicitly, is investigated by
means of Metropolis simulations of the brain peptide Met-Enkephalin. For the
phenomenological energy function ECEPP/2 nine atomic solvation parameter (ASP)
sets are studied that had been proposed by previous authors. The simulations
are compared with each other, with simulations with a distance dependent
electrostatic permittivity $\epsilon (r)$, and with vacuum simulations
($\epsilon =2$). Parallel tempering and a recently proposed biased Metropolis
technique are employed and their performances are evaluated. The measured
observables include energy and dihedral probability densities (pds), integrated
autocorrelation times, and acceptance rates. Two of the ASP sets turn out to be
unsuitable for these simulations. For all other sets, selected configurations
are minimized in search of the global energy minima. Unique minima are found
for the vacuum and the $\epsilon(r)$ system, but for none of the ASP models.
Other observables show a remarkable dependence on the ASPs. In particular,
autocorrelation times vary dramatically with the ASP parameters. Three ASP sets
have much smaller autocorrelations at 300 K than the vacuum simulations...

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## ‣ Boundaries of strongly accessible hyperbolic groups

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 24/10/1998
Português

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We consider splittings of groups over finite and two-ended subgroups. We
study the combinatorics of such splittings using generalisations of Whitehead
graphs. In the case of hyperbolic groups, we relate this to the topology of
the boundary. In particular, we give a proof that the boundary of a one-ended
strongly accessible hyperbolic group has no global cut point.; Comment: 47 pages. Published copy, also available at
http://www.maths.warwick.ac.uk/gt/GTMon1/paper3.abs.html

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## ‣ Metropolis simulations of Met-Enkephalin with solvent-accessible area parameterizations

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 17/06/2003
Português

Relevância na Pesquisa
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We investigate the solvent-accessible area method by means of Metropolis
simulations of the brain peptide Met-Enkephalin at 300$ K$. For the energy
function ECEPP/2 nine atomic solvation parameter (ASP) sets are studied. The
simulations are compared with one another, with simulations with a distance
dependent electrostatic permittivity $\epsilon (r)$, and with vacuum
simulations ($\epsilon =2$). Parallel tempering and the biased Metropolis
techniques RM$_1$ are employed and their performance is evaluated. The measured
observables include energy and dihedral probability densities (pds), integrated
autocorrelation times, and acceptance rates. Two of the ASP sets turn out to be
unsuitable for these simulations. For all other systems selected configurations
are minimized in search of the global energy minima, which are found for the
vacuum and the $\epsilon(r)$ system, but for none of the ASP models. Other
observables show a remarkable dependence on the ASPs. In particular, we find
three ASP sets for which the autocorrelations at 300$ $K are considerably
smaller than for vacuum simulations.; Comment: 10 pages and 8 figures

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## ‣ Thermodynamic Entropy And The Accessible States of Some Simple Systems

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 12/08/2007
Português

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Comparison of the thermodynamic entropy with Boltzmann's principle shows that
under conditions of constant volume the total number of arrangements in simple
thermodynamic systems with temperature-independent heat capacities is TC/k. A
physical interpretation of this function is given for three such systems; an
ideal monatomic gas, an ideal gas of diatomic molecules with rotational motion,
and a solid in the Dulong-Petit limit of high temperature. T1/2 emerges as a
natural measure of the number of accessible states for a single particle in one
dimension. Extension to N particles in three dimensions leads to TC/k as the
total number of possible arrangements or microstates. The different microstates
of the system are thus shown a posteriori to be equally probable, with
probability T-C/k, which implies that for the purposes of counting states the
particles of the gas are distinguishable. The most probable energy state of the
system is determined by the degeneracy of the microstates.; Comment: 9 pages, 1 figure

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## ‣ Metric abstract elementary classes as accessible categories

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Português

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We show that metric abstract elementary classes (mAECs) are, in the sense of
[LR] (i.e. arXiv:1404.2528), coherent accessible categories with directed
colimits, with concrete $\aleph_1$-directed colimits and concrete
monomorphisms. More broadly, we define a notion of $\kappa$-concrete AEC---an
AEC-like category in which only the $\kappa$-directed colimits need be
concrete---and develop the theory of such categories, beginning with a
category-theoretic analogue of Shelah's Presentation Theorem and a proof of the
existence of an Ehrenfeucht-Mostowski functor in case the category is large.
For mAECs in particular, arguments refining those in [LR] yield a proof that
any categorical mAEC is $\mu$-d-stable in many cardinals below the categoricity
cardinal.; Comment: v2: changed terminology. v3: tightened inequalities

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## ‣ A Self-Contained and Easily Accessible Discussion of the Method of Descente Infinie and Fermat's Only Explicitly Known Proof by Descente Infinie

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Português

Relevância na Pesquisa
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#Computer Science - Artificial Intelligence#Computer Science - Logic in Computer Science#03-03, 01A45

We present the only proof of Pierre Fermat by descente infinie that is known
to exist today. As the text of its Latin original requires active mathematical
interpretation, it is more a proof sketch than a proper mathematical proof. We
discuss descente infinie from the mathematical, logical, historical,
linguistic, and refined logic-historical points of view. We provide the
required preliminaries from number theory and develop a self-contained proof in
a modern form, which nevertheless is intended to follow Fermat's ideas closely.
We then annotate an English translation of Fermat's original proof with terms
from the modern proof. Including all important facts, we present a concise and
self-contained discussion of Fermat's proof sketch, which is easily accessible
to laymen in number theory as well as to laymen in the history of mathematics,
and which provides new clarification of the Method of Descente Infinie to the
experts in these fields. Last but not least, this paper fills a gap regarding
the easy accessibility of the subject.; Comment: ii + 36 pages, French abstract (R\'esum\'e) included in paper

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## ‣ Making FPGAs Accessible to Scientists and Engineers as Domain Expert Software Programmers with LabVIEW

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 20/08/2014
Português

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#Computer Science - Software Engineering#Computer Science - Distributed, Parallel, and Cluster Computing#Computer Science - Operating Systems#Computer Science - Programming Languages

In this paper we present a graphical programming framework, LabVIEW, and
associated language and libraries, as well as programming techniques and
patterns that we have found useful in making FPGAs accessible to scientists and
engineers as domain expert software programmers.; Comment: Presented at First International Workshop on FPGAs for Software
Programmers (FSP 2014) (arXiv:1408.4423)

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## ‣ Evaluating Accessible Synchronous CMC Applications

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Português

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This paper proposes a more comprehensive evaluation methodology to measure
the usability and user experience qualities of accessible synchronous
computer-mediated communication applications. The methodology goes beyond
current practices by evaluating how the interaction between a user and a
product influences the user experience of those at the other endpoint of the
communication channel. A major contribution is given with the proposal of a
user test where one of the participants tries to guess whether the other
participant has a disability or not. The proposed test is inspired in the
Turing Test, and is a consequence of user requirements elicited from a group of
individuals with motor and speech disabilities. These ideas are tested and
validated with two examples of synchronous communication applications.; Comment: 15 pages. Modifications with respect to v2: Added references [5] and
[10], Renamed section 5 to 'Disability Test', changed names 'mystery1' and
'mystery2' to 'advisor D' and 'advisor ND', elaborated on the discussion (sec
7.3) and conclusions (sec 8)

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## ‣ Locally class-presentable and class-accessible categories

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Português

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We generalize the concepts of locally presentable and accessible categories.
Our framework includes such categories as small presheaves over large
categories and ind-categories. This generalization is intended for applications
in the abstract homotopy theory.

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## ‣ Locally accessible information from multipartite ensembles

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Português

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We present a universal Holevo-like upper bound on the locally accessible
information for arbitrary multipartite ensembles. This bound allows us to
analyze the indistinguishability of a set of orthogonal states under LOCC. We
also derive the upper bound for the capacity of distributed dense coding with
multipartite senders and multipartite receivers.; Comment: A draft, minor changes, comments are welcome

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## ‣ Classification theory for accessible categories

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Português

Relevância na Pesquisa
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We show that a number of results on abstract elementary classes (AECs) hold
in accessible categories with concrete directed colimits. In particular, we
prove a generalization of a recent result of Boney on tameness under a large
cardinal assumption. We also show that such categories support a robust version
of the Ehrenfeucht-Mostowski construction. This analysis has the added benefit
of producing a purely language-free characterization of AECs, and highlights
the precise role played by the coherence axiom.; Comment: 17 pages

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## ‣ The strange-quark chemical potential as an experimentally accessible "order parameter" of the deconfinement phase transition for finite baryon-density

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 05/12/2002
Português

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We consider the change of the strange-quark chemical potential in the phase
diagram of nuclear matter, employing the Wilson loop and scalar quark
condensate order parameters, mass-scaled partition functions and enforcing
flavor conservation. Assuming the region beyond the hadronic phase to be
described by massive, correlated and interacting quarks, in the spirit of
lattice and effective QCD calculations, we find the strange-quark chemical
potential to change sign: from positive in the hadronic phase - to zero upon
deconfinement - to negative in the partonic domain. We propose this change in
the sign of the strange-quark chemical potential to be an experimentally
accessible order parameter and a unique, concise and well-defined indication of
the quark-deconfinement phase transition in nuclear matter.; Comment: 22 pages, 14 figures within text, 2 figures(6,B3) as separate files.
To be published in J.Phys.G: Nucl.&Part.Phys. G28 (2002)

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## ‣ On the Number of Elements Needed in a POVM Attaining the Accessible Information

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 19/09/2000
Português

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We investigate a symmetric set of three quantum states in three dimensions
having interesting properties, which we call the lifted trine states. We show
that for the ensemble consisting of the three lifted trine states taken with
equal probabilities, the POVM measurement realizing the accessible information
must contain six projectors, giving a counterexample to a conjecture of
Levitin.; Comment: Will appear in Proceedings of QCM&C 2000 (Kluwer). Eventually, I plan
to write a longer paper on these lifted trine states which will contain this
paper as its first section

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## ‣ Accessible Proof of Standard Monomial Basis for Coordinatization of Schubert Sets of Flags

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 11/08/2015
Português

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The main results of this paper are accessible with only basic linear algebra.
Given an increasing sequence of dimensions, a flag in a vector space is an
increasing sequence of subspaces with those dimensions. The set of all such
flags (the flag manifold) can be projectively coordinatized using products of
minors of a matrix. These products are indexed by tableaux on a Young diagram.
A basis of "standard monomials" for the vector space generated by such
projective coordinates over the entire flag manifold has long been known. A
Schubert variety is a subset of flags specified by a permutation. Lakshmibai,
Musili, and Seshadri gave a standard monomial basis for the smaller vector
space generated by the projective coordinates restricted to a Schubert variety.
Reiner and Shimozono made this theory more explicit by giving a straightening
algorithm for the products of the minors in terms of the right key of a Young
tableau. Since then, Willis introduced scanning tableaux as a more direct way
to obtain right keys. This paper uses scanning tableaux to give more-direct
proofs of the spanning and the linear independence of the standard monomials.
In the appendix it is noted that this basis is a weight basis for the dual of a
Demazure module for a Borel subgroup of GL(n). This paper contains a complete
proof that the characters of these modules (the key polynomials) can be
expressed as the sums of the weights for the tableaux used to index the
standard monomial bases.; Comment: 18 pages

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## ‣ Closed-Form Summation of RG-Accessible Logarithmic Contributions to Semileptonic B-Decays and Other Perturbative Processes

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Português

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For any perturbative series that is known to $k$-subleading orders of
perturbation theory, we utilise the process-appropriate renormalization-group
(RG) equation in order to obtain all-orders summation of series terms
proportional to $\alpha^n \log^{n-k}(\mu^2)$ with $k = {0,1,2,3}$,
corresponding to the summation to all orders of the leading and
subsequent-three-subleading logarithmic contributions to the full perturbative
series. These methods are applied to the perturbative series for semileptonic
$b$-decays in both MS-bar and pole-mass schemes, and they result in RG-summed
series for the decay rates which exhibit greatly reduced sensitivity to the
renormalization scale $\mu$. Such summation via RG-methods of all logarithms
accessible from known series terms is also applied to perturbative QCD series
for vector- and scalar-current correlation functions, the perturbative static
potential function, the (single-doublet standard-model) Higgs decay amplitude
into two gluons, as well as the Higgs-mediated high-energy cross-section for
$W^+W^-\to ZZ$ scattering. The resulting RG-summed expressions are also found
to be much less sensitive to the renormalization scale than the original series
for these processes.; Comment: latex2e using amsmath. 45 pages with 15 eps figures embedded in
manuscript. Revised version contains updated analysis in Section 3 and
additional references

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## ‣ Precession during merger 1: Strong polarization changes are observationally accessible features of strong-field gravity during binary black hole merger

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Português

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The short gravitational wave signal from the merger of compact binaries
encodes a surprising amount of information about the strong-field dynamics of
merger into frequencies accessible to ground-based interferometers. In this
paper we describe a previously-unknown "precession" of the peak emission
direction with time, both before and after the merger, about the total angular
momentum direction. We demonstrate the gravitational wave polarization encodes
the orientation of this direction to the line of sight. We argue the effects of
polarization can be estimated nonparametrically, directly from the
gravitational wave signal as seen along one line of sight, as a slowly-varying
feature on top of a rapidly-varying carrier. After merger, our results can be
interpreted as a coherent excitation of quasinormal modes of different angular
orders, a superposition which naturally "precesses" and modulates the
line-of-sight amplitude. Recent analytic calculations have arrived at a similar
geometric interpretation. We suspect the line-of-sight polarization content
will be a convenient observable with which to define new high-precision tests
of general relativity using gravitational waves. Additionally, as the nonlinear
merger process seeds the initial coherent perturbation...

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## ‣ Abstract elementary classes and accessible categories

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Português

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We compare abstract elementary classes of Shelah with accessible categories
having directed colimits.

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## ‣ Locally accessible information: How much can the parties gain by cooperating?

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Português

Relevância na Pesquisa
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We investigate measurements of bipartite ensembles restricted to local
operations and classical communication and find a universal Holevo-like upper
bound on the locally accessible information. We analyze our bound and exhibit a
class of states which saturate it. Finally, we link the bound to the problem of
quantification of the nonlocality of the operations necessary to extract
locally unaccessible information.; Comment: 4 pages, no figures, RevTeX4; v2: a conjecture partially proven,
results unchanged; v3: small changes in presentation, published version

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## ‣ Hamiltonian Magnetohydrodynamics: Lagrangian, Eulerian, and Dynamically Accessible Stability - Theory

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 03/08/2013
Português

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Stability conditions of magnetized plasma flows are obtained by exploiting
the Hamiltonian structure of the magnetohydrodynamics (MHD) equations and, in
particular, by using three kinds of energy principles. First, the Lagrangian
variable energy principle is described and sufficient stability conditions are
presented. Next, plasma flows are described in terms of Eulerian variables and
the noncanonical Hamiltonian formulation of MHD is exploited. For symmetric
equilibria, the energy-Casimir principle is expanded to second order and
sufficient conditions for stability to symmetric perturbation are obtained.
Then, dynamically accessible variations, i.e. variations that explicitly
preserve invariants of the system, are introduced and the respective energy
principle is considered. General criteria for stability are obtained, along
with comparisons between the three different approaches.

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## ‣ E-accessible Astronomy Resources

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 09/06/2010
Português

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#Astrophysics - Instrumentation and Methods for Astrophysics#Computer Science - Human-Computer Interaction

Making online resources more accessible to physically challenged library
users is a topic deserving informed attention from astronomy librarians.
Recommendations like WCAG 2.0 standards and section 508, in the United States,
have proven valuable, and some vendors are already making their products
compliant with them. But what about the wide variety of databases and other
resources produced by astronomy information professionals themselves? Few, if
any, of these are currently compliant with accessibility standards. Here we
discuss some solutions to these accessibility challenges.; Comment: 8 pages, 4 figures, to appear in Library and Information Services in
Astronomy VI, ASP Conference Proceedings

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