6,518 research outputs found
Electronic properties of emergent topological defects in chiral -wave superconductivity
Chiral -wave superconductors in applied magnetic field can exhibit more
complex topological defects than just conventional superconducting vortices,
due to the two-component order parameter (OP) and the broken time-reversal
symmetry. We investigate the electronic properties of those exotic states, some
of which contain clusters of one-component vortices in chiral components of the
OP and/or exhibit skyrmionic character in the \textit{relative} OP space, all
obtained as a self-consistent solution of the microscopic Bogoliubov-de Gennes
equations. We reveal the link between the local density of states (LDOS) of the
novel topological states and the behavior of the chiral domain wall between the
OP components, enabling direct identification of those states in scanning
tunneling microscopy. For example, a skyrmion always contains a closed chiral
domain wall, which is found to be mapped exactly by zero-bias peaks in LDOS.
Moreover, the LDOS exhibits electron-hole asymmetry, which is different from
the LDOS of conventional vortex states with the same vorticity. Finally, we
present the magnetic field and temperature dependence of the properties of a
skyrmion, indicating that this topological defect can be surprisingly large in
size, and can be pinned by an artificially indented non-superconducting closed
path in the sample. These features are expected to facilitate the experimental
observation of skyrmionic states, thereby enabling experimental verification of
chirality in emerging superconducting materials
Hyper-chaotic magnetisation dynamics of two interacting dipoles
The present work is a numerical study of the deterministic spin dynamics of two interacting anisotropic magnetic particles in the presence of a time-dependent external magnetic field using the Landau–Lifshitz equation. Particles are coupled through the dipole–dipole interaction. The applied magnetic field is made of a constant longitudinal amplitude component and a time-dependent transversal amplitude component. Dynamical states obtained are represented by their Lyapunov exponents and bifurcation diagrams. The dependence on the largest and the second largest Lyapunov exponents, as a function of the magnitude and frequency of the applied magnetic field, and the relative distance between particles, is studied. The system presents multiple transitions between regular and chaotic behaviour depending on the control parameters. In particular, the system presents consistent hyper-chaotic states
Assessing the Nutrition Knowledge and Body Image Perceptions of Minority Freshman at East Tennessee State University
The health status of African American and Hispanic communities is in need of intervention. These minority groups have a health disparity gap from other races. The incidences of hypertension, diabetes, and obesity are greater in the African American and Hispanic communities. There is a need to continue addressing the specific health issues, along with ideas of body perception, plaguing the African American and Hispanic populations in the United States. Such disparities typically include those who follow “western” diets, have a lack of exercise, are predisposed to chronic illness, as well as have a need for continuous education of the subject matter. This research project is addressing the need for nutrition interventions in the Johnson City, Tennessee minority community, specifically the African American and Hispanic populations. Prevention can be a useful tool in the reduction of health disparities. Freshman, minority students represent a suitable population to implement prevention strategies. East Tennessee State University’s Quest Program is designed specifically for freshman, minority students. The focus group of this research project includes the participants of the Quest program at East Tennessee State University (ETSU). The purpose of this research is to determine the degree of nutrition knowledge and to assess perceptions of body image of minority freshman at ETSU
Correlated photon pairs generated from a warm atomic ensemble
We present measurements of the cross-correlation function of photon pairs at
780 nm and 1367 nm, generated in a hot rubidium vapor cell. The temporal
character of the biphoton is determined by the dispersive properties of the
medium where the pair generation takes place. We show that short correlation
times occur for optically thick samples, which can be understood in terms of
off-resonant pair generation. By modifying the linear response of the sample,
we produce near-resonant photon pairs, which could in principle be used for
entanglement distribution
Realistic Anisotropic Neutron Stars: Pressure Effects
In this paper, we study the impact of anisotropy on neutron stars with
different equations of state, which have been modeled by a piecewise polytropic
function with continuous sound speed. Anisotropic pressure in neutron stars is
often attributed to interior magnetic fields, rotation, and the presence of
exotic matter or condensates. We quantify the presence of anisotropy within the
star by assuming a quasi-local relationship. We find that the radial and
tangential sound velocities constrain the range of anisotropy allowed within
the star. As expected, the anisotropy affects the macroscopic properties of
stars, and it can be introduced to reconcile them with astrophysical
observations. For instance, the maximum mass of anisotropic neutron stars can
be increased by up to 15\% compared to the maximum mass of the corresponding
isotropic configuration. This allows neutron stars to reach masses greater than
, which may explain the secondary compact object of the GW190814
event. Additionally, we propose a universal relation for the binding energy of
an anisotropic neutron star as a function of the star's compactness and the
degree of anisotropy.Comment: 12 pages, 7 figure
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Use of functional imaging across clinical phases in CNS drug development
The use of novel brain biomarkers using nuclear magnetic resonance imaging holds potential of making central nervous system (CNS) drug development more efficient. By evaluating changes in brain function in the disease state or drug effects on brain function, the technology opens up the possibility of obtaining objective data on drug effects in the living awake brain. By providing objective data, imaging may improve the probability of success of identifying useful drugs to treat CNS diseases across all clinical phases (I–IV) of drug development. The evolution of functional imaging and the promise it holds to contribute to drug development will require the development of standards (including good imaging practice), but, if well integrated into drug development, functional imaging can define markers of CNS penetration, drug dosing and target engagement (even for drugs that are not amenable to positron emission tomography imaging) in phase I; differentiate objective measures of efficacy and side effects and responders vs non-responders in phase II, evaluate differences between placebo and drug in phase III trials and provide insights into disease modification in phase IV trials
La Investigación En La Práctica Pedagógica De Los Docentes De Educación Media
La investigación docente no debe estar limitada a campos específicos de las universidades, por el contrario, es pertinente que los docentes en todos los niveles educativos del sistema escolar, apoyen su práctica pedagógica con la realización de estudios que sistematicen sus experiencias y contribuyan al campo de la educación. El presente artículo exhibe los desarrollos de la tesis doctoral Aproximación Teórica a la Investigación en la Práctica Pedagógica de los Docentes de Educación Media, para el cual se asume una visión epistemológica constructivista, con metodología hermenéutico dialéctica, bajo el paradigma cualitativo y se sigue el método de la teoría fundamentada para el análisis de datos y la generación teórica. El estudio concluye con la presentación de la aproximación teórica según el constructo emergente que se revela en relación a la investigación en la práctica pedagógica de los docentes de educación media
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