985 research outputs found
Global-in-time solutions for the isothermal Matovich-Pearson equations
In this paper we study the Matovich-Pearson equations describing the process
of glass fiber drawing. These equations may be viewed as a 1D-reduction of the
incompressible Navier-Stokes equations including free boundary, valid for the
drawing of a long and thin glass fiber. We concentrate on the isothermal case
without surface tension. Then the Matovich-Pearson equations represent a
nonlinearly coupled system of an elliptic equation for the axial velocity and a
hyperbolic transport equation for the fluid cross-sectional area. We first
prove existence of a local solution, and, after constructing appropriate
barrier functions, we deduce that the fluid radius is always strictly positive
and that the local solution remains in the same regularity class. To the best
of our knowledge, this is the first global existence and uniqueness result for
this important system of equations
Unconventional superconductivity in the cage type compound ScRhSn
We have examined the superconducting ground state properties of the caged
type compound ScRhSn using magnetization, heat capacity, and
muon-spin relaxation or rotation (SR) measurements. Magnetization
measurements indicate type-II superconductivity with an upper critical field
= 7.24 T. The zero-field cooled and field cooled
susceptibility measurements unveil an onset of diamagnetic signal below = 4.4 K. The interpretation of the heat capacity results below
using the BCS model unveils the value of = 2.65, which gives
the dimensionless ratio 2 = 5.3, intimating that
ScRhSn is a strong-coupling BCS superconductor. The zero-field
SR measurements in the longitudinal geometry exhibit a signature of a
spontaneous appearance of the internal magnetic field below the superconducting
transition temperature, indicating that the superconducting state is
characterized by the broken time-reversal symmetry (TRS). We have compared the
results of broken TRS in ScRhSn with that observed in
RRhSn (R = Lu and Y).Comment: 6 pages, 4 figures. arXiv admin note: text overlap with
arXiv:1411.687
Influence of School Operational Assistance Fund (BOS) Management on the Student Grade Advancement in Fatuleu State High School 1, Kupang District
This study aims to analyze the influence of School Operational Assistance (BOS) funds management on the Grade Advancement rate of the underprivileged students in SMA I Fatuleu (Fatuleu State High School 1), Fatuleu District, Kupang Regency, NTT Province. This research is a descriptive correlational study, using a quantitative approach. The location of this research was Fatuleu State High School 1, located in Fatuleu District, Kupang Regency. The sampling method used in this study was a probability sampling method with a simple random sampling technique. The collected data were processed using a computer with the following stages of analysis; (1) Univariate Analysis; (2) Bivariate Analysis; (3) Multivariate Analysis.Research result exhibited simultaneously a significant influence between Organizing, Planning and Monitoring and Evaluation on the timeliness of the Grade Advancement Rate of Underprivileged Students in Fatuleu State High School 1; there is a significant influence between planning variables on the timeliness of the Grade Advancement Rate of Underprivileged Students in Fatuleu State High School 1; there is a significant influence between the Organizing variables on the timeliness of the Grade Advancement Rate of Underprivileged Students in Fatuleu State High School 1; there is no significant influence between the monitoring and evaluation variables on the timeliness of the Grade Advancement Rate of Underprivileged Students in Fatuleu State High School 1. Keywords:Management; School Operational Assistance Fund; Grade Advancement; Planning; Organizing; Monitoring. DOI: 10.7176/PPAR/9-3-13 Publication date:March 31st 201
Broken time-reversal symmetry probed by muon spin relaxation in the caged type superconductor Lu5Rh6Sn18
The superconducting state of the caged type compound Lu5Rh6Sn18 has been investigated by using magnetization, heat capacity, and muon spin relaxation or rotation (?SR) measurements, and the results interpreted on the basis of the group theoretical classifications of the possible pairing symmetries and a simple model of the resulting quasiparticle spectra. Our zero-field ?SR measurements clearly reveal the spontaneous appearance of an internal magnetic field below the transition temperature, which indicates that the superconducting state in this material is characterized by broken time-reversal symmetry. Further, the analysis of the temperature dependence of the magnetic penetration depth measured using the transverse-field ?SR measurements suggests an isotropic s?wave character for the superconducting gap. This is in agreement with the heat capacity behavior, and we show that it can be interpreted in terms of a nonunitary triplet state with point nodes and an open Fermi surface
Investigation of Superconducting Gap Structure in HfIrSi using muon spin relaxation/rotation
Appearance of strong spin-orbit coupling (SOC) is apparent in ternary
equiatomic compounds with 5-electrons due to the large atomic radii of
transition metals. SOC plays a significant role in the emergence of
unconventional superconductivity. Here we examined the superconducting state of
HfIrSi using magnetization, specific heat, zero and transverse-field (ZF/TF)
muon spin relaxation/rotation (SR) measurements. Superconductivity is
observed at = 3.6 K as revealed by specific heat and
magnetization measurements. From the TFSR analysis it is clear that
superfluid density well described by an isotropic BCS type -wave gap
structure. Furthermore, from TFSR data we have also estimated the
superconducting carrier density = 6.6 10m,
London penetration depth = 259.59 nm and effective mass
= 1.57 . Our zero-field muon spin relaxation data indicate no
clear sign of spontaneous internal field below , which implies
that the time-reversal symmetry is preserved in HfIrSi. Theoretical
investigation suggests Hf and Ir atoms hybridize strongly along the -axis of
the lattice, which is responsible for the strong three-dimensionality of this
system which screens the Coulomb interaction. As a result despite the presence
of correlated -electrons in this system, the correlation effect is weakened,
promoting electron-phonon coupling to gain importance.Comment: 8 pages, 4 figure
Probing the superconducting ground state of ZrIrSi: A SR study
The superconducting ground state of newly reported ZrIrSi is probed by means
of SR technique along with resistivity measurement. The occurrence of
superconductivity at = 1.7 K is confirmed by resistivity
measurement. ZF-SR study revealed that below , there is no
spontaneous magnetic field in the superconducting state, indicates TRS is
preserved in case of ZrIrSi. From TF-SR measurement, we have estimated the
superfluid density as a function of temperature, which is described by an
isotropic wave model with a superconducting gap
= 5.1, indicates the presence of strong
spin-orbit coupling. {\it Ab-initio} electronic structure calculation indicates
that there are four bands passing through the Fermi level, forming four Fermi
surface pockets. We find that the low-energy bands are dominated by the
-orbitals of transition metal Zr, with substantially lesser weight from the
-orbitals of the Ir-atoms.Comment: 6 pages, 4 figure
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