834 research outputs found
Study of properties of high field superconductors, ac field induced flux jumps Technical summary report, 21 Jun. 1965 - 26 Apr. 1966
Magnetization experiments in superimposed dc and audiofrequency ac magnetic fields on cold worked NbTi alloy samples - ac field induced flux jump
Study of properties of high-field superconductors at elevated temperatures Final technical report, 27 Apr. - 26 Aug. 1966
Properties of high field superconductors at high temperatures - magnetization experiments on niobium and niobium compound
Boundary conditions for translation-invariant Gibbs measures of the Potts model on Cayley trees
We consider translation-invariant splitting Gibbs measures (TISGMs) for the
-state Potts model on a Cayley tree of order two. Recently a full
description of the TISGMs was obtained, and it was shown in particular that at
sufficiently low temperatures their number is . In this paper for each
TISGM we explicitly give the set of boundary conditions such that
limiting Gibbs measures with respect to these boundary conditions coincide with
.Comment: 15 pages, 8 figure
On free energies of the Ising model on the Cayley tree
We present, for the Ising model on the Cayley tree, some explicit formulae of
the free energies (and entropies) according to boundary conditions (b.c.). They
include translation-invariant, periodic, Dobrushin-like b.c., as well as those
corresponding to (recently discovered) weakly periodic Gibbs states. The later
are defined through a partition of the tree that induces a 4-edge-coloring. We
compute the density of each color.Comment: 18 pages, 4 figure
On -adic Gibbs Measures for Hard Core Model on a Cayley Tree
In this paper we consider a nearest-neighbor -adic hard core (HC) model,
with fugacity , on a homogeneous Cayley tree of order (with neighbors). We focus on -adic Gibbs measures for the HC model, in
particular on -adic "splitting" Gibbs measures generating a -adic Markov
chain along each path on the tree. We show that the -adic HC model is
completely different from real HC model: For a fixed we prove that the
-adic HC model may have a splitting Gibbs measure only if divides
. Moreover if divides but does not divide then there
exists unique translational invariant -adic Gibbs measure. We also study
-adic periodic splitting Gibbs measures and show that the above model admits
only translational invariant and periodic with period two (chess-board) Gibbs
measures. For (resp. ) we give necessary and sufficient
(resp. necessary) conditions for the existence of a periodic -adic measure.
For k=2 a -adic splitting Gibbs measures exists if and only if p=3, in this
case we show that if belongs to a -adic ball of radius 1/27 then
there are precisely two periodic (non translational invariant) -adic Gibbs
measures. We prove that a -adic Gibbs measure is bounded if and only if
.Comment: 17 page
Molecular Conformation of Pyridinic Aromatic Esters. II. Electronic Absorption Spectra and Dipole Moments by Semiempirical Methods
The semiempirical MIM method was applied to calculate the
UV spectra of nine pyridine-aromatic-ester derivatives (having the
general formula R1-COO-R2) assuming a planar geometry. Benzene,
pyridine and formic acid were adopted as component systems.
The dipole moments of the same compounds were evaluated at the
MIM and INDO levels and the equilibrium percentage of the conformers
was deduced from experimental and theoretical values.
Comparable results were generally obtained. On the whole the
results are satisfactory but not sufficient to affirm with certainty
if the molecular skeleton is or is not planar
Molecular Conformation of Aza-substituted Benzanilides by Electronic Absorption Spectra and Dipole Moments
The electronic absorption spectra of thirteen pyridine aromatic
amides of general formula R1-CO-NH- R2 (Ri, R2 = pyridil or
phenyl) were obtained in methanol and dioxane solution.
The band assignment is briefly discussed.
The dipole moments were measured in dioxane at 25 ± 0.1 °c
and compared with values calculated by both the S. H. M. 0. method
and vectorial model. The comparison suggests the most probable
conformation of derivatives which have the nitrogen either in the
ortho or meta position in one or both rings of the molecule
The Plant Ontology: A common reference ontology for plants
The Plant Ontology (PO) (http://www.plantontology.org) (Jaiswal et al., 2005; Avraham et al., 2008) was designed to facilitate cross-database querying and to foster consistent
use of plant-specific terminology in annotation. As new data are generated from the ever-expanding list of plant genome projects, the need for a consistent, cross-taxon vocabulary has grown. To meet this need, the PO is being expanded to represent all plants. This is the first ontology designed to encompass anatomical structures as well as growth and developmental stages across such a broad taxonomic range. While other ontologies such as the Gene Ontology (GO) (The Gene Ontology Consortium, 2010) or Cell Type Ontology (CL) (Bard et al., 2005) cover all living organisms,
they are confined to structures at the cellular level and below. The diversity of growth forms and life histories within plants presents a challenge, but also provides unique opportunities to study developmental and evolutionary homology across organisms
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