6,570 research outputs found
Systems and methods for reconfiguring input devices
A system includes an input device having first and second input members configured to be activated by a user. The input device is configured to generate activation signals associated with activation of the first and second input members, and each of the first and second input members are associated with an input function. A processor is coupled to the input device and configured to receive the activation signals. A memory coupled to the processor, and includes a reconfiguration module configured to store the input functions assigned to the first and second input members and, upon execution of the processor, to reconfigure the input functions assigned to the input members when the first input member is inoperable
Distributive Lattices, Affine Semigroups, and Branching Rules of the Classical Groups
We study algebras encoding stable range branching rules for the pairs of
complex classical groups of the same type in the context of toric degenerations
of spherical varieties. By lifting affine semigroup algebras constructed from
combinatorial data of branching multiplicities, we obtain algebras having
highest weight vectors in multiplicity spaces as their standard monomial type
bases. In particular, we identify a family of distributive lattices and their
associated Hibi algebras which can uniformly describe the stable range
branching algebras for all the pairs we consider.Comment: 30 pages, extensively revise
Effect of magnesium doping on the orbital and magnetic order in LiNiO2
In LiNiO2, the Ni3+ ions, with S=1/2 and twofold orbital degeneracy, are
arranged on a trian- gular lattice. Using muon spin relaxation (MuSR) and
electron spin resonance (ESR), we show that magnesium doping does not stabilize
any magnetic or orbital order, despite the absence of interplane Ni2+. A
disordered, slowly fluctuating state develops below 12 K. In addition, we find
that magnons are excited on the time scale of the ESR experiment. At the same
time, a g factor anisotropy is observed, in agreement with
orbital occupancy
Development and Preliminary Validation of an Equine Brief Pain Inventory for Owner Assessment of Chronic Pain Due to Osteoarthritis in Horses
An owner-completed questionnaire was designed to monitor the level of chronic pain and impact on quality of life in horses with osteoarthritis (OA). A standardized approach to develop and validate subjective-state scales for clinical use was followed. Scale items were generated through literature review, focus group meetings, and expert panel evaluation. The draft tool was tested for reading level and language ambiguity and piloted in 25 owners/caregivers of horses with osteo-arthritis, with factor analysis performed on responses. The resulting revised questionnaire is cur-rently undergoing validation in a larger sample population of 60 OA and 20 sound control horses. In the pilot group, 21 people (84%) found the questionnaire easy to complete and 22 people (88%) found it useful. It could be completed within 5 min by all participants. Readability scores (Flesch Reading Ease Score, Flesch–Kincaid grade level, SMOG index) indicated an English language reading level comparable to that of 6th to 7th grade in the U.S. system (age 11–12 years). Cronbach’s alpha of all items in the tool was 0.957, indicating excellent inter-item correlation. In-terim analysis for 23 OA horses from the sample population showed good test–retest reliability and higher scores compared to 5 control horses. Full validation must be completed for the in-strument to be used in clinical practice
Discrete skew selfadjoint canonical systems and the isotropic Heisenberg magnet model
A discrete analog of a skew selfadjoint canonical (Zakharov-Shabat or AKNS)
system with a pseudo-exponential potential is introduced. For the corresponding
Weyl function the direct and inverse problem are solved explicitly in terms of
three parameter matrices. As an application explicit solutions are obtained for
the discrete integrable nonlinear equation corresponding to the isotropic
Heisenberg magnet model. State space techniques from mathematical system theory
play an important role in the proofs
Toward Solution of Matrix Equation X=Af(X)B+C
This paper studies the solvability, existence of unique solution, closed-form
solution and numerical solution of matrix equation with and where is the
unknown. It is proven that the solvability of these equations is equivalent to
the solvability of some auxiliary standard Stein equations in the form of
where the dimensions of the coefficient
matrices and are the same as those of
the original equation. Closed-form solutions of equation can then
be obtained by utilizing standard results on the standard Stein equation. On
the other hand, some generalized Stein iterations and accelerated Stein
iterations are proposed to obtain numerical solutions of equation equation
. Necessary and sufficient conditions are established to guarantee
the convergence of the iterations
PDBTM: Protein Data Bank of transmembrane proteins after 8 years
The PDBTM database (available at http://pdbtm
.enzim.hu), the first comprehensive and up-to-date
transmembrane protein selection of the Protein
Data Bank, was launched in 2004. The database
was created and has been continuously updated
by the TMDET algorithm that is able to distinguish
between transmembrane and non-transmembrane
proteins using their 3D atomic coordinates only.
The TMDET algorithm can locate the spatial positions
of transmembrane proteins in lipid bilayer as
well. During the last 8 years not only the size of the
PDBTM database has been steadily growing from
~400 to 1700 entries but also new structural
elements have been identified, in addition to the
well-known a-helical bundle and b-barrel structures.
Numerous ‘exotic’ transmembrane protein structures
have been solved since the first release,
which has made it necessary to define these new
structural elements, such as membrane loops or
interfacial helices in the database. This article
reports the new features of the PDBTM database
that have been added since its first release, and
our current efforts to keep the database
up-to-date and easy to use so that it may continue
to serve as a fundamental resource for the scientific
community
Fluctuations in the Site Disordered Traveling Salesman Problem
We extend a previous statistical mechanical treatment of the traveling
salesman problem by defining a discrete "site disordered'' problem in which
fluctuations about saddle points can be computed. The results clarify the basis
of our original treatment, and illuminate but do not resolve the difficulties
of taking the zero temperature limit to obtain minimal path lengths.Comment: 17 pages, 3 eps figures, revte
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