1,700 research outputs found
Effects of the tensor force on the ground and first states of the magic Ca nucleus
The magic nature of the Ca nucleus is investigated in the light of the
recent experimental results. We employ both HFB and HF+BCS methods using
Skyrme-type SLy5, SLy5+T and T44 interactions. The evolution of the
single-particle spectra is studied for the N=34 isotones: Fe, Cr,
Ti and Ca. An increase is obtained in the neutron spin-orbit
splittings of and states due to the effect of the tensor force which
also makes Ca a magic nucleus candidate. QRPA calculations on top of
HF+BCS are performed to investigate the first = states of the
calcium isotopic chain. A good agreement for excitation energies is obtained
when we include the tensor force in the mean-field part of the calculations.
The first states indicate a subshell closure for both Ca and
Ca nuclei. We confirm that the tensor part of the interaction is quite
essential in explaining the neutron subshell closure in Ca and Ca
nuclei.Comment: 8 pages, 3 figure
Origin of gamma-ray emission in the shell of Cassiopeia A
Non-thermal X-ray emission from the shell of Cassiopeia A (Cas A) has been an
interesting subject of study, as it provides information about relativistic
electrons and their acceleration mechanisms in the shocks. Chandra X-ray
observatory revealed the detailed spectral and spatial structure of this SNR in
X-rays. The spectral analysis of Chandra X-ray data of Cas A shows unequal flux
levels for different regions of the shell, which can be attributed to different
magnetic fields in those regions. Additionally, the GeV gamma-ray emission
observed by Large Area Telescope on board Fermi Gamma Ray Space Telescope
showed that the hadronic processes are dominating in Cas A, a clear signature
of acceleration of protons. In this paper we aim to explain the GeV-TeV
gamma-ray data in the context of both leptonic and hadronic scenario. We
modeled the multi-wavelength spectrum of Cas A. We use synchrotron emission
process to explain the observed non-thermal X-ray fluxes from different regions
of the shell. These result in estimation of the model parameters, which are
then used to explain TeV gamma-ray emission spectrum. We also use hadronic
scenario to explain both GeV and TeV fluxes simultaneously. We show that a
leptonic model alone cannot explain the GeV-TeV data. Therefore, we need to
invoke a hadronic model to explain the observed GeV-TeV fluxes. We found that
although pure hadronic model is able to explain the GeV-TeV data, a
lepto-hadronic model provides the best fit to the data.Comment: Accepted in A&
Restoration of error-diffused images using projection onto convex sets
Cataloged from PDF version of article.In this paper, a novel inverse halftoning method is
proposed to restore a continuous tone image from a given half-tone
image. A set theoretic formulation is used where three sets are defined
using the prior information about the problem. A new spacedomain
projection is introduced assuming the halftoning is performed
using error diffusion, and the error diffusion filter kernel is
known. The space-domain, frequency-domain, and space-scale domain
projections are used alternately to obtain a feasible solution
for the inverse halftoning problem which does not have a unique
solution
The distribution and taxonomy of Lissotriton newts in Turkey (Amphibia, Salamandridae)
Two and perhaps three taxa of
Lissotriton
newt occur in Turkey. Their species status is controversial. The
distribution of these taxa and the taxonomic status of each are reviewed and discussed. A database of 128
Turkish
Lissotriton
localities was compiled and species distribution models were constructed. We reiterate
that the presence of
L.
(
v.
)
lantzi
in Turkey is disputed and needs confirmation. The range of
L.
(
v.
)
koss
-
wigi
is restricted to north-western Anatolia – given the small global range of this Turkey endemic, a closer
look at its conservation status is warranted. The distribution of
L. v. schmidtleri
covers western Asiatic
and European Turkey. The findings support an allopatric distribution of the Turkish
Lissotriton
species.
We reflect on the biological significance of previously reported morphological intermediates between
L.
(
v.
)
kosswigi
and
L. v. schmidtleri
in the light of the recent proposal to recognize
kosswigi
at the species
level. The available data are in line with species status for
L.
(
v.
)
lantzi
and
L.
(
v.
)
kosswigi
. Although
L. v.
schmidtleri
is a genetically diverged taxon as well, the extent of gene flow with parapatric European
Lis
-
sotriton
taxa is as yet unknown
Multi-scale directional-filtering-based method for follicular lymphoma grading
Cataloged from PDF version of article.Follicular lymphoma (FL) is a group of malignancies of lymphocyte origin that arise from lymph nodes, spleen, and bone marrow in the lymphatic system. It is the second most common non-Hodgkins lymphoma. Characteristic of FL is the presence of follicle center B cells consisting of centrocytes and centroblasts. Typically, FL images are graded by an expert manually counting the centroblasts in an image. This is time consuming. In this paper, we present a novel multi-scale directional filtering scheme and utilize it to classify FL images into different grades. Instead of counting the centroblasts individually, we classify the texture formed by centroblasts. We apply our multi-scale directional filtering scheme in two scales and along eight orientations, and use the mean and the standard deviation of each filter output as feature parameters. For classification, we use support vector machines with the radial basis function kernel. We map the features into two dimensions using linear discriminant analysis prior to classification. Experimental results are presented
Görsel Destek ile Öğretilen Eşzamanlı İpucuyla Öğretimin Annelerin Otizmli Çocuklarına Beceri Öğretmelerindeki Etkililiği
Only teaching in schools is not enough for individuals with developmental disabilities for them to be independent in the society. For this reason, the present study has four purposes(a) Can the mothers implement simultaneous prompting reliably which was taught to them via visual supports?, (b)Can children with developmental disabilities acquire the target skills which were taught by their mothers?, (c) Can mothers and children with developmental disabilities maintain and generalize the acquired skills during the study?, and (d) What are the opinions of mothers regarding the teaching method and the study? In order to reach these purposes, a multiple probe design across participants was used in the study with four children and their mothers. After conducting the study at the homes of the participants, it was seen that mothers reliably implemented simultaneous prompting which was taught via a training CD, besides, children with developmental disabilities acquired the target skills which were taught by their mothers in the study.Gelişimsel yetersizliği olan bireylerin toplum içinde bağımsız yaşantılar sürdürebilmeleri için sadece okulda yapılan eğitim-öğretim yeterli olmamaktadır. Bu nedenle bu çalışmanın dört amacı bulunmaktadır: (a) Kendilerine CD aracılığıyla eşzamanlı ipucuyla öğretim yöntemi öğretilen anneler yöntemi güvenilir olarak kullanabilecekler mi?, (b) Gelişimsel yetersizliği olan çocuklar kendilerine öğretilen becerileri öğrenebilecekler mi?, (c) Çalışmaya katılan anneler ve çocukları öğrendikleri becerileri öğretim tamamlandıktan sonra da sürdürebilecekler ve genelleyebilecekler mi? ve (d) Çalışmaya katılan annelerin yönteme ve çalışmaya ilişkin görüşleri nedir? Bu amaçları gerçekleştirebilmek üzere deneklerarası yoklama evreli çoklu yoklama modeli kullanılarak dört anne ve çocuğuyla çalışılmıştır. Katılımcıların evlerinde gerçekleştirilen uygulamalar sonucunda annelerin kendilerine CD aracılığıyla öğretilen eşzamanlı ipucuyla öğretim yöntemini güvenilir bir biçimde uygulayabildikleri ve gelişimsel yetersizliği olan çocuklarının da annelerinin öğrettiği hedef becerileri öğrendikleri görülmüştür
PCV45 Long Term Cost-Effectiveness Analysis of Ticagrelor in Patients with Acute Coronary Syndromes From a Turkish Health Care Perspective Based on Data From the Plato Trial
Enhanced germination and electrotactic behaviour of Phytophthora palmivora zoospores in weak electric fields
Soil-dwelling microorganisms use a variety of chemical and physical signals to navigate their environment. Plant roots produce endogenous electric fields which result in characteristic current profiles. Such electrical signatures are hypothesised to be used by pathogens and symbionts to track and colonise plant roots.
The oomycete pathogen Phytophthora palmivora generates motile zoospores which swim towards the positive pole when exposed to an external electric field in vitro.
Here, we provide a quantitative characterization of their electrotactic behaviour in 3D. We found that a weak electric field (0.7 - 1.0 V/cm) is sufficient to induce an accumulation of zoospore at the positive pole, without affecting their encystment rate. We also show that the same external electric field increases the zoospore germination rate and orients the germ tube's growth. We conclude that several early stages of the P. palmivora infection cycle are affected by external electric fields.
Taken together, our results are compatible with the hypothesis that pathogens use plant endogenous electric fields for host targeting.
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