publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2017-10-26 | SDSS J090152.05+624342.6: A New "Overlapping-Trough" FeLoBAL Quasar At Z$\sim2$ | We here report an identification of SDSS J090152.04+624342.6 as a new
"overlapping-trough" iron low-ionization broad absorption line quasar at
redshift of $z\sim2.1$. No strong variation of the broad absorption lines can
be revealed through the two spectra taken by the Sloan Digital Sky Survey with
a time interval of $... | 1710.09527v1 |
2017-11-03 | Supernova β^- decay of nuclides 53Fe, 54Fe, 55Fe, and 56Fe in strongly screened plasma | The electron screening strong effect on the electron energy and threshold
energy of the beta decay reaction. in this paper, we study the $\beta^-$ decay
rates of some iron isotopes. The electron screening beta decay rates increase
by about two orders of magnitude. The strong screening beta decay rates due to
Q-value co... | 1711.01955v3 |
2017-11-29 | The Memory Function Formalism: A Review | An introduction to the Zwanzig-Mori-G\"{o}tze-W\"{o}lfle memory function
formalism (or generalized Drude formalism) is presented. This formalism is used
extensively in analyzing the experimentally obtained optical conductivity of
strongly correlated systems like cuprates and Iron based superconductors etc.
For a broade... | 1711.10758v1 |
2017-11-30 | A note on the contribution of multi-photon processes to radiative opacity | Recently, Bailey et al. performed iron opacity measurements on the Z machine
at Sandia National Laboratory in conditions close to the ones of the base of
the convective zone of the Sun. Such experiments have raised questions about
the physical models commonly used in opacity codes. To understand the
discrepancy between... | 1711.11295v1 |
2017-12-10 | Visible evidence to magnetism of graphene oxide | Graphene oxide continues to amaze scientific community for multiple
potentials in a broad span of applications such as catalysts, adsorbents,
oxidants, etc., determined by constant unveiling of its fantastic natures. Of
them, magnetism is not ultimately identified and directly observed by naked
eyes. Herein, we report ... | 1712.03570v4 |
2017-12-22 | Novel Method for Background Phase Removal on MRI Proton Resonance Frequency Measurements | MR images have a magnitude and a phase, but in almost all clinical
applications only the magnitude images are used, because the phase images have
a smooth but strong background signal that masks useful information. The phase
contains information such as the temperature during thermal ablation, and the
iron content of b... | 1712.08651v1 |
2018-02-23 | Electronic entropy in Green's-function calculations at finite temperatures | We revise critically existing approaches to evaluation of thermodynamic
potentials within the Green's function calculations at finite electronic
temperatures. We focus on the entropy and show that usual technical problems
related to the multivalued nature of the complex logarithm can be overcome.
This results in a simp... | 1802.08495v1 |
2018-03-01 | High Temperature Electronic Structure with KKR | Modeling high temperature (10's or 100's of eV), dense plasmas is challenging
due to the multitude of non-negligible physical effects including significant
partial ionization and multi-site effects. These effects cause the breakdown or
intractability of common methods and approximations used at low temperatures,
such a... | 1803.00596v1 |
2018-03-18 | Effect of gap anisotropy on the spin resonance peak in the superconducting state of iron-based materials | Spin resonance in the superconducting state of Fe-based materials within the
multiorbital model with unequal anisotropic gaps on different Fermi surface
sheets is studied. On the basis of the model gap function and the one
calculated within the spin fluctuation theory of pairing, I show that the
resonance peak shifts t... | 1803.06736v2 |
2018-05-03 | Binarizer at SemEval-2018 Task 3: Parsing dependency and deep learning for irony detection | In this paper, we describe the system submitted for the SemEval 2018 Task 3
(Irony detection in English tweets) Subtask A by the team Binarizer. Irony
detection is a key task for many natural language processing works. Our method
treats ironical tweets to consist of smaller parts containing different
emotions. We break... | 1805.01112v1 |
2018-05-15 | Nuclear EMC effect through $\barΛ/Λ$ production in semi-inclusive deep-inelastic scattering processes | We calculate $\Lambda$ and $\bar{\Lambda}$ hadron production cross sections
in charged lepton semi-inclusive deep-inelastic scattering off nuclear target
($A$, using iron $\mathrm{Fe}$ as an example) and deuteron ($D$) target. The
results show that the ratio
$(\bar{\Lambda}^{A}/\Lambda^{A})/(\bar{\Lambda}^{D}/\Lambda^{... | 1805.05544v1 |
2018-05-16 | Lattice distortions and/or intercalation as ways to induce magnetism in a-FeSi2: a theoretical study | The possibilities to induce magnetism in the non-magnetic bulk alpha-FeSi2 by
means of lattice distortions or intercalation with metal or non-metal ions of
light elements is investigated theoretically by combined ab initio and model
methods. We find that the distortions indeed can induce the formation of
magnetic momen... | 1805.06189v1 |
2018-05-25 | Pairing Mechanism in Hunds Metal Superconductors and the Universality of the Superconducting Gap to Critical Temperature Ratio | We analyze a simple model containing the physical ingredients of a Hund's
metal, the local spin fluctuations with power-law correlators,
$(\Omega_0/|\Omega|)^\gamma$, with $\gamma$ greater than one, interacting with
electronic quasiparticles. While the critical temperature and the gap change
significantly with varying ... | 1805.10280v2 |
2018-05-30 | Charged and Neutral Current Pion Production in Neutrino-Nucleus Scattering | In this article, we present the charged and neutral current coherent pion
production in the neutrino-nucleus interaction in the resonance region using
the formalism based on the partially conserved axial current (PCAC) theorem
which relates the neutrino-nucleus cross section to the pion-nucleus elastic
cross section. T... | 1805.11836v1 |
2018-06-08 | The Role of Opacities in Stellar Pulsation | We examine the role of opacities in stellar pulsation with reference to
Cepheids and RR Lyraes, and examine the effect of augmented opacities on the
theoretical pulsation light curves in key temperature ranges. The temperature
ranges are provided by recent experimental and theoretical work that have
suggested that the ... | 1806.02996v1 |
2018-08-01 | Long range dynamical coupling between magnetic adatoms mediated by a 2D topological insulator | We study the spin excitation spectra and the dynamical exchange coupling
between iron adatoms on a Bi bilayer nanoribbon. We show that the topological
character of the edge states is preserved in the presence of the magnetic
adatoms. Nevertheless, they couple significantly to the edge spin currents, as
witnessed by the... | 1808.00347v1 |
2018-08-07 | Origin of superconductivity in Ni-doped SrFe_2As_2 , an Insight from DMFT | I describe the issues of the competing orders in normal state of a parent and
Ni-doped iron pnictide superconductor, SrF e 2 As 2 , using LMTO band structure
calculation plus multi orbital dynamical mean-field theory. Strong, electronic
correlations along with minimal antiferromagnetic instability create a
partially ga... | 1808.02298v1 |
2019-11-12 | Classification of materials with phonon angular momentum and microscopic origin of angular momentum | We group materials into five symmetry classes and determine in which of these
classes phonons carry angular momentum in the Brillouin zone, away from a
high-symmetry point, line, or plane. In some materials phonons acquire angular
momentum via the forces induced by relative displacements of atoms out of their
equilibri... | 1911.05064v3 |
2020-01-27 | Influence of Iron Losses on Switching Dynamics of an Electromagnet from Experiment and Simulation | The switching behaviour of electromagnets is determined by the inertia of the
armature, the stiffness of the return spring and the magnetostatic forces
between armature and yoke. For highly dynamic systems, hysteresis and eddy
current losses have a slowing effect. In this paper we consider the
experimentally observed b... | 2001.09638v1 |
2020-05-21 | Cluster Dynamics Modeling of Niobium and Titanium Carbide Precipitates | Kinetics of niobium and titanium carbide precipitates in iron has been
simulated with cluster dynamics. The simulations, carried out in austenite and
ferrite for niobium carbides, respectively in austenite for titanium carbide,
were analyzed for dependency on temperature, solute concentration, and initial
cluster distr... | 2005.10574v2 |
2020-07-12 | Reconstruction of 3D Image of Nanorice Particle from Randomly Oriented Single-Shot Experimental Diffraction Patterns Using Angular Correlation Method | We reconstructed intensities in Fourier space and electron densities in the
real space for an azimuthally symmetric object Nanorice particle (Iron Oxide
nanoparticle) exposed in the ultrashort, bright and coherent x-ray free
electron laser (XFEL) pulses with random unknown orientations through the
method of angular cor... | 2007.06030v1 |
2021-06-17 | Effects of Covid-19 Pandemic on Chinese Commodity Futures Markets | In this study, empirical moments and the cointegration for all the liquid
commodity futures traded in the Chinese futures markets are analyzed for the
periods before and after Covid-19, which is important for trading strategies
such as pairs trading. The results show that the positive change in the average
returns of t... | 2106.09250v1 |
2021-06-28 | Strap-on magnets: a framework for rapid prototyping of magnets and beam lines | We describe a framework to assemble permanent-magnet cubes in 3D-printed
frames to construct dipole, quadrupole, and solenoid magnets, whose field, in
the absence of iron, can be calculated analytically in three spatial
dimensions. Rotating closely spaced dipoles and quadrupoles in opposite
directions allows us to adju... | 2106.14676v1 |
2021-07-08 | Warm Magnets | Warm magnets are magnets that function in normal ambient temperature
conditions. These types are mostly using a soft steel yoke for field
amplification and either Copper or Aluminium coils or permanent magnets to
generate the field. Magnets powered with such normal-conducting coils are often
also called classical, iron... | 2107.03965v1 |
2021-11-08 | Thermogravimetric study of the non-stoichiometric wüstite FeOx. Pseudo phases w i and w' i . New T-P-X equilibrium phase diagram | A statistical numerical analysis of thermogravimetric measurements
(temperature, mass variation, oxygen pressure) leads to a new equilibrium phase
diagram T-P-X of the iron monoxide or w\"ustite FeOx. Three varieties or pseudo
phases W1, W2, W3 are revealed above 911 {\textdegree}C, three others W'1, W'2,
W'3 below. Th... | 2111.04346v1 |
2017-04-19 | Remote Document Encryption - encrypting data for e-passport holders | We show how any party can encrypt data for an e-passport holder such that
only with physical possession of the e-passport decryption is possible. The
same is possible for electronic identity cards and driver licenses. We also
indicate possible applications. Dutch passports allow for 160 bit security,
theoretically givi... | 1704.05647v3 |
2017-05-02 | Computation of the unifying thread in high temperature superconductors from first principles quantum Monte Carlo | It has long been a challenge to describe the origin of unconventional
superconductivity. The two known examples with high Tc, based on iron and
copper, have very different electronic structures, while other materials with
similar electronic structure may not show superconductivity at all. In this
paper, the authors sho... | 1705.01008v1 |
2017-06-09 | Ultrasound attenuation in $s^\pm$-wave two-band superconductors | The two-band $s^{\pm}$-wave state is currently considered to be the most
promising candidate for newly discovered iron-based high-$T_c$ superconductors.
In this work we study theoretically the ultrasound attenuation in
$s^{\pm}$-wave two-band superconductors. The impurity effect is calculated
within the $\mathcal{T}$-m... | 1706.02963v1 |
2018-02-23 | Electronic entropy in Green's-function calculations at finite temperatures | We revise critically existing approaches to evaluation of thermodynamic
potentials within the Green's function calculations at finite electronic
temperatures. We focus on the entropy and show that usual technical problems
related to the multivalued nature of the complex logarithm can be overcome.
This results in a simp... | 1802.08495v1 |
2018-08-01 | Long range dynamical coupling between magnetic adatoms mediated by a 2D topological insulator | We study the spin excitation spectra and the dynamical exchange coupling
between iron adatoms on a Bi bilayer nanoribbon. We show that the topological
character of the edge states is preserved in the presence of the magnetic
adatoms. Nevertheless, they couple significantly to the edge spin currents, as
witnessed by the... | 1808.00347v1 |
2018-08-07 | Origin of superconductivity in Ni-doped SrFe_2As_2 , an Insight from DMFT | I describe the issues of the competing orders in normal state of a parent and
Ni-doped iron pnictide superconductor, SrF e 2 As 2 , using LMTO band structure
calculation plus multi orbital dynamical mean-field theory. Strong, electronic
correlations along with minimal antiferromagnetic instability create a
partially ga... | 1808.02298v1 |
2018-08-19 | Size-dependent phase morphologies in LiFePO4 battery particles | Lithium iron phosphate (LiFePO$_4$) is the prototypical two-phase battery
material, whose complex patterns of lithium ion intercalation provide a testing
ground for theories of electrochemical thermodynamics. Using a depth-averaged
(a-b plane) phase-field model of coherent phase separation driven by Faradaic
reactions,... | 1808.06164v1 |
2018-08-20 | Production of Metal-free Diamond Nanoparticles | In this paper, the controlled production of high quality metal-free diamond
nanoparticles is demonstrated. Milling with tempered steel is shown to leave
behind iron oxide contamination which is difficult to remove. Milling with SiN
alleviates this issue but generates more non diamond carbon. Thus the choice of
milling ... | 1808.06425v1 |
2018-10-14 | Plasma opacity calculations using the Starrett and Saumon average-atom model with ion correlations | We present the opacities of iron, aluminum, and bromine plasmas calculated
using the Starrett and Saumon average-atom model allowing for ion correlations.
We show that the use of earlier average-atom ion-correlation model of Rozsnyai,
as has recently been done in the solar opacity calculations, overestimates the
effect... | 1810.06027v1 |
2019-01-03 | A magnetic tight-binding model : surface properties of transition metals and cobalt nanoparticules | The magnetic and surface properties of some transition metals have been
investigated through the tight-binding approximation including Coulomb
correlations. These surface properties are derived from a charge neutrality
rule restricted to the d-band leading to a charge distribution including sp
surface states in agreeme... | 1901.00841v4 |
2019-01-28 | X-ray diffraction analysis to support phase identification in FeSe and Fe$_7$Se$_8$ epitaxial thin films | X-ray diffraction (XRD) data and analysis for epitaxial iron selenide thin
films grown by pulsed laser deposition (PLD) are presented. The films contain
${\beta}$-FeSe and Fe$_7$Se$_8$ phases in a double epitaxy configuration with
the ${\beta}$-FeSe phase (001) oriented on the (001) MgO growth substrate.
Fe$_7$Se$_8$ s... | 1901.09794v1 |
2019-07-17 | Role of interactions in the energy of the spin resonance peak in Fe-based superconductors | We consider the spin response within the five-orbital model for iron-based
superconductors and study two cases: equal and unequal gaps in different bands.
In the first case, the spin resonance peak in the superconducting state appears
below the characteristic energy scale determined by the gap magnitude,
$2\Delta_L$. I... | 1907.08133v1 |
2019-10-07 | Thermodynamic dislocation theory for polycrystals under tension/compression | Starting from the assumption that all possible orientations of grains are
equally probable, we prove that the geometric factor of thermodynamic
dislocation theory for polycrystals subjected to axially symmetric tension or
compression must be equal to 2. We then use large-scale least-square analysis
to identify the phys... | 1910.02642v2 |
2019-10-25 | Portable system for the prediction of anemia based on the ocular conjunctiva using Artificial Intelligence | Anemia is a major health burden worldwide. Examining the hemoglobin level of
blood is an important way to achieve the diagnosis of anemia, but it requires
blood drawing and a blood test. In this work we propose a non-invasive, fast,
and cost-effective screening test for iron-deficiency anemia in Peruvian young
children... | 1910.12399v1 |
2020-03-04 | Classical Nova Carinae 2018: Discovery of circumbinary iron and oxygen | We present time-lapse spectroscopy of a classical nova explosion commencing 9
days after discovery. These data reveal the appearance of a transient feature
in Fe II and [O I]. We explore different models for this feature and conclude
that it is best explained by a circumbinary disc shock-heated following the
classical ... | 2003.02008v1 |
2020-08-21 | Multipole Orders in a Chain Ferrate Na2FeSe | Fundamental block and staggered orders of magnetic Fe multipoles in Na2FeSe2
are classified by their symmetry and magnetoelectric properties. Our structure
model incorporates ferromagnetic or antiferromagnetic coupling between chains.
The ferrate salt is valued in studies of highly correlated electrons as the
only iron... | 2008.09374v1 |
2020-09-07 | Anomalous In-plane Magnetic Anisotropy in Strain-mediated Converse Magnetoelectric Coupling | Magnetic axis rotation (MAR) in ferromagnetic (FM) layers is crucial for
strain-mediated converse magnetoelectric coupling. Employing the density
functional theory (DFT), we computationally study the magnetic anisotropy of
selected deformed FM materials such as body-centered iron. The results show
that the short axis i... | 2009.03045v2 |
2020-10-27 | Thermodynamic approach to electric quadrupole moments | Higher-rank electric/magnetic multipole moments are attracting attention
these days as candidate order parameters for exotic material phases. However,
quantum-mechanical formulation of those multipole moments is still an ongoing
issue. In this paper, we propose a thermodynamic definition of electric
quadrupole moments ... | 2010.13999v1 |
2020-11-18 | Spin superfluidity in noncollinear antiferromagnets | We explore the spin superfluid transport in exchange interaction dominated
three-sublattice antiferromagnets. The system in the long-wavelength regime is
described by an $SO(3)$ invariant field theory. Additional corrections from
Dzyaloshinskii-Moriya interactions or anisotropies can break the symmetry;
however, the sy... | 2011.09102v2 |
2020-12-22 | Unusual Scaling of Kondo Spin Relaxation | The relation between the Kondo spin relaxation rate $ {\tau_{sK}}^{-1} $ and
the Kondo momentum relaxation rate $ {\tau_{eK}}^{-1} $ is explored by using
nonlocal spin valves with submicron copper channels that contain dilute iron
impurities. A linear relation between $ {\tau_{sK}}^{-1} $ and $
{\tau_{eK}}^{-1} $ is es... | 2012.11781v1 |
2020-12-23 | Magnetic Moment Tensor Potentials for collinear spin-polarized materials reproduce different magnetic states of bcc Fe | We present the magnetic Moment Tensor Potentials (mMTPs), a class of
machine-learning interatomic potentials, accurately reproducing both
vibrational and magnetic degrees of freedom as provided, e.g., from
first-principles calculations. The accuracy is achieved by a two-step
minimization scheme that coarse-grains the a... | 2012.12763v2 |
2021-03-08 | All-order relativistic computations for atoms and molecules using an explicitly correlated Gaussian basis | A variational solution procedure is reported for the many-particle no-pair
Dirac-Coulomb-Breit Hamiltonian aiming at a parts-per-billion (ppb) convergence
of the atomic and molecular energies, described within the fixed nuclei
approximation. The procedure is tested for nuclear charge numbers from $Z=1$
(hydrogen) to $2... | 2103.04923v1 |
2021-03-14 | Nuclear effects in neutrino-nucleus DIS and probe for short range correlation | We investigate charged-current neutrino-nucleus deep inelastic scattering
with particular interests in relationship of short range correlation (SRC) and
EMC effect. The structure functions $F^A_2(x,Q^2)$, $x F^A_3(x,Q^2)$ and ratios
of differential cross sections are presented where the nuclei $A$ are chosen to
be carb... | 2103.07873v1 |
2021-04-05 | Two-magnon Raman scattering in antiferromagnetic phases of frustrated spin models on the honeycomb lattice | We calculate the two-magnon Raman scattering spectra in antiferromagnetic
phases of several frustrated spin models defined on the honeycomb lattice.
These include the N\'{e}el antiferromagnetic phase of a $J_1$-$J_2$-$J_3$ model
and the stripe phase of the Heisenberg-Kitaev model. We show that both the
magnetic frustra... | 2104.01903v1 |
2021-04-08 | Ferromagnetism in a Semiconductor with Mobile Carriers via Low-Level Nonmagnetic Doping | We show that doped cubic iron pyrite, which is a diamagnetic semiconductor,
becomes ferromagnetic when $p$-type doped. We furthermore find that this
material can exhibit high spin polarization both for tunneling and transport
devices. These results are based on first principles electronic structure and
transport calcul... | 2104.03877v1 |
2021-09-30 | Pairing enhanced by local orbital fluctuations in a model for monolayer FeSe | The pairing mechanism in different classes of correlated materials, including
iron based superconductors, is still under debate. For FeSe monolayers, uniform
nematic fluctuations have been shown in a lattice Monte Carlo study to play a
potentially important role. Here, using dynamical mean field theory
calculations for... | 2109.15312v1 |
2021-12-16 | Investigating the Longitudinal Development of EAS with Ultra High Energies | The simulation of the extensive air showers was performed by investigating
the longitudinal development parameters (N and Xmax) by using AIRES system
version 19.04.0. The simulation was performed at the energy range (10^18-10^20
eV) for different primary particles (such as primary proton and iron nuclei)
and different ... | 2201.00401v1 |
2022-01-13 | The FACET Project: Forward Aperture CMS ExTension to search for new Long-Lived Particles | FACET is a proposed new subsysem for CMS to search for portals such as dark
photons, dark higgs, heavy neutral leptons and axion-like particles in the very
forward direction at the High Luminosity LHC. Such particles can penetrate up
to 50 m of iron and then decay inside a 14 m$^3$ vacuum pipe made by enlarging
an 18 m... | 2201.05224v1 |
2022-01-28 | Theory of spin-excitation anisotropy in the nematic phase of FeSe obtained from RIXS measurements | Recent resonant inelastic x-ray scattering (RIXS) experiments have detected a
significant high-energy spin-excitation anisotropy in the nematic phase of the
enigmatic iron-based superconductor FeSe, whose origin remains controversial.
We apply an itinerant model previously used to describe the spin-excitation
anisotrop... | 2201.12008v2 |
2022-04-28 | Spin-glass-like behaviour in SmFeAsO0.8F0.2 | The iron-based oxypnictide superconductor SmFeAsO0.8F0.2 was synthesized
under high-pressure and investigated by measuring dc magnetic susceptibility.
The zero-field cooled (ZFC) magnetic susceptibility confirmed the bulk
superconductivity of the sample with a critical temperature of Tc = 50 K and a
significant jump in... | 2204.13473v2 |
2022-05-16 | Feedback of non-local $d_{xy}$ nematicity on the magnetic anisotropy in FeSe | We analyze theoretically the magnetic anisotropy in the nematic phase of FeSe
by computing the spin and the orbital susceptibilities from the microscopic
multiorbital model. In particular, we take into account both the $xz/yz$ and
the recently proposed non-local $xy$ nematic ordering and show that the latter
one could ... | 2205.07718v1 |
2022-08-05 | Exploring the bouncing cosmological models in symmetric teleparallel gravity | In this study, cosmological models with perfect fluid and a gravitational
framework f(Q) will be examined. In this modified theory of gravity, the
gravitational force has the form f(Q), where Q stands for the non-metricity
scalar. I create two bouncing cosmological models, one in which the Lagrangian
f(Q) is assumed to... | 2208.03171v1 |
2022-10-01 | India Based Neutrino Observatory, Physics Reach and Status Report | The India-based Neutrino Observatory (INO) is a proposed underground facility
located in India that will primarily house the magnetised Iron CALorimeter
(ICAL) detector to study atmospheric neutrinos produced by interactions of
cosmic rays with Earth's atmosphere. The physics goal is to to make precision
measurements o... | 2210.00206v2 |
2022-10-31 | Superconducting Magnet System Concept with a Mechanical Energy Transfer in the Magnetic Field | There is an interest to design superconducting magnet systems working in a
persistent current mode. These systems continuously generate magnetic field
with disconnected power source working like permanent magnet devices. In this
paper proposed a magnet system concept based on the direct mechanical energy
transfer in th... | 2211.00102v1 |
2022-10-31 | HTS Dipole Magnet with a Mechanical Energy Transfer in the Magnetic Field | There were designed and successfully tested at Fermilab several high
temperature superconducting (HTS) model magnets for particle accelerators. Some
of them worked in a persistent current mode continuously generating magnetic
field in the iron dominated magnet gap. In the paper was investigated a novel
HT dipole magnet... | 2211.00105v1 |
2022-11-02 | A brief perspective of high temperature superconductivity in the cuprates: Strong correlations combined with superexchange match experiment | High temperature superconductivity encompasses the cuprates, nickelates, iron
pnictides, and LaH$_x$ compounds. The first three groups of compounds involve
in the pairing electrons, which are strongly to moderately correlated, whereas
in the last class of systems specific phonon excitations. In this overview we
concent... | 2211.01024v1 |
2022-12-01 | Numerical simulation of non-central collisions of spherical magnets | We present a computational model of non-central collisions of two spherical
neodymium-iron-boron magnets, suggested as a demonstration of angular momentum
conservation. Our program uses an attractive dipole-dipole force and a
repulsive contact force to solve the Newtonian equations of motion for the
magnets. We confirm... | 2212.00876v1 |
2022-12-19 | Equivalence of Active and Passive Gravitational Mass Tested with Lunar Laser Ranging | LLR measures the distance between observatories on Earth and retro-reflectors
on Moon since 1969. In this paper, we study the possible violation of the
equality of passive and active gravitational mass ($m_{a}/m_{p}$), for
Aluminium (Al) and Iron (Fe), using LLR data. Our new limit of
$3.9\cdot10^{-14}$ is about 100 ti... | 2212.09407v1 |
2022-12-27 | Tuning quantum paramagnetism and d-wave superconductivity in single-layer iron chalcogenides by chemical pressure | By substituting S into single-layer FeSe/SrTiO3, chemical pressure is applied
to tune its paramagnetic state that is modeled as an incoherent superposition
of spin-spiral states. The resulting electronic bands resemble an ordered
checkerboard antiferromagnetic structure, consistent with angle-resolved
photoemission spe... | 2212.13603v2 |
2023-02-03 | An Equilibrated Error Estimator for the 2D/1D MSFEM T-Formulation of the Eddy Current Problem | The 2D/1D multiscale finite element method (MSFEM) is an efficient way to
simulate rotating machines in which each iron sheet is exposed to the same
field. It allows the reduction of the three dimensional sheet to a two
dimensional cross-section by resolving the dependence along the thickness of
the sheet with a polyno... | 2302.01601v1 |
2023-03-09 | Full-waveform tomography reveals iron spin crossover in Earth lower mantle | Joint interpretation of bulk and shear wave speeds constrains the chemistry
of the deep mantle. At all depths, the diversity of wave speeds cannot be
explained by an isochemical mantle. Between 1000 and 2500 km depth,
hypothetical mantle models containing an electronic spin crossover in (Mg,Fe)O
provide a significantly... | 2303.05476v1 |
2023-05-07 | Surface supercurrent diode effect | We propose a new type of supercurrent diode effect on the surface of a
superconductor with surface states under in-plane magnetic fields. Surface
supercurrent diode effect can lead to a perfect supercurrent diode in a
considerably wide range of fields. For comparison, the conventional
supercurrent diode effect due to t... | 2305.04219v2 |
2023-05-12 | DFT+U Type Strong Correlation Functional Derived from Multiconfigurational Wavefunction Theory | We present a DFT+U-type functional for strong correlation, derived from
multiconfigurational wavefunction theory. The reference system experiences
electron-electron interactions only in DFT+U-type atomic states, yielding a
block-localized configuration interaction Hamiltonian which depends on the
atomic state occupanci... | 2305.07736v2 |
2023-05-15 | Easily Computed Marginal Likelihoods from Posterior Simulation Using the THAMES Estimator | We propose an easily computed estimator of marginal likelihoods from
posterior simulation output, via reciprocal importance sampling, combining
earlier proposals of DiCiccio et al (1997) and Robert and Wraith (2009). This
involves only the unnormalized posterior densities from the sampled parameter
values, and does not... | 2305.08952v1 |
2023-08-01 | Overview of superconductivity in field-cooled magnetic materials | Considerable experimental skills have been accumulated in the preparation of
field-cooled (FC) magnetic materials. This stimulates the search for FC
magnetic materials that are superconductors.
The article overviews the recent proposed mechanism of superconductivity in
field-cooled magnetic materials.
It is based o... | 2308.00470v1 |
2023-10-31 | Generating site saturation mutagenesis libraries and transferring them to broad host range plasmids using type IIS restriction enzymes | Protein engineering is an established method for tailoring enzymatic
reactivity. A commonly used method is directed evolution, where the mutagenesis
and natural selection process is mimicked and accelerated in the laboratory.
Here, we describe a reliable method for generating saturation mutagenesis
libraries by golden ... | 2311.00138v1 |
2023-11-21 | Comment on "Ironing, sweeping, and multidimensional screening'' | In their study of price discrimination for a monopolist selling heterogeneous
products to consumers having private information about their own
multidimensional types, Rochet and Chon\'e (1998) discovered a new form of
screening in which consumers with intermediate types are bunched together into
isochoice groups of var... | 2311.13012v2 |
2024-01-04 | Multiband Quantum Materials | Quantum materials are defined by the emergence of new properties resulting
from collective quantum effects and by holding promise for their quantum
applications. Novel superconductors, from high-Tc cuprates and iron-based
superconductors to twisted monolayers, exhibit a higher level of emergent
complexity, with a multi... | 2401.02237v1 |
2024-01-07 | Mid-infrared evidence for iron-rich dust in the multi-ringed inner disk of HD 144432 | Context. Rocky planets form by the concentration of solid particles in the
inner few au regions of planet-forming disks. Their chemical composition
reflects the materials in the disk available in the solid phase at the time the
planets were forming. Aims. We aim to constrain the structure and dust
composition of the in... | 2401.03437v1 |
2024-01-16 | The effect of iron layer thickness on the interlayer exchange coupling in Fe/MgO (001) superlattices | We describe the effect of the Fe layer thickness on the antiferromagnetic
interlayer exchange coupling in [Fe/MgO]$_N$ superlattices. An increase in
coupling strength with increasing Fe layer thickness is observed, which
highlights the need of including the extension of both the layers when
discussing the interlayer ex... | 2401.08336v1 |
2023-11-10 | Automatic extraction and 3D reconstruction of split wire from point cloud data based on improved DPC algorithm | In order to solve the problem of point cloud data splitting improved by DPC
algorithm, a research on automatic separation and 3D reconstruction of point
cloud data split lines is proposed. First, the relative coordinates of each
point in the cloud point are calculated. Second, it is planned to develop a
relative ensemb... | 2401.08587v1 |
2024-02-20 | Electron-phonon coupling in ferromagnetic Fe-Co alloys from first principles | We calculate from first principles the electron-phonon coupling strength in
ferromagnetic iron-cobalt Fe$_{1-x}$Co$_x$ alloys for compositions ranging from
$x=0$ to $x=0.75$. We find strong, spin-dependent variation of the
electron-phonon coupling strength with alloy composition. The minimum of the
electron-phonon inte... | 2402.12650v1 |
2024-02-20 | Enhancement of the critical current by surface irregularities in Fe-based superconductors | The critical current $I_c$ of single crystals of the iron pnictide
superconductor BaFe$_2$(As$_{1-x}$P$_x$)$_2$, has been studied through
measurements of magnetic hysteresis cycles. We show that the introduction of
surface irregularities in the $\mu$m scale significantly increase $I_c$,
primarily near the irreversibili... | 2402.12933v1 |
2024-03-28 | X-ray reflectometric studies of nanoparticulate hematite films to decouple the rough and smooth behaviors of it and crystallographic and morphological properties concerning fatty acid chain length | In this study, the use of X-Ray reflectometry technique signifies the types
of rough and smooth surfaces of hematite film prepared from different fatty
acid derivatives of the iron salt. Followed by this, the film morphology and
crystallographic properties concerning different fatty acid chain length have
been discusse... | 2403.19065v1 |
1995-06-14 | ASCA PV observations of the Seyfert 1 galaxy MCG-6-30-15 : rapid variability of the warm absorber | We present a detailed re-analysis of the two {\it ASCA} Performance
Verification observations of the nearby Seyfert 1 galaxy MCG-6-30-15.
Confirming the results of Fabian et al. (1994), we find definite evidence for
the {\sc O\,vii} and {\sc O\,viii} K-shell absorption edges of the warm
absorber and a doubling of the w... | 9506086v1 |
1996-03-18 | The X-Ray Spectral Variability of Mrk 766 | Analysis results from ASCA and ROSAT observations of the narrow-line Seyfert
1 galaxy Mrk 766 are reported. In the ASCA observation we observed rapid
variability with a doubling time scale of 1000 seconds. A spectral variability
event was observed in which the spectrum softened and hardened above and below
~1 keV, resp... | 9603091v1 |
1996-04-23 | The Luminosity-Metallicity Relation for Bulges of Spiral Galaxies | Optical integrated spectra of bulges have been obtained for 28 spiral
galaxies. By applying an appropriate aperture size for each galaxy, the
unavoidable contamination of disk starlight has been carefully minimized and
set to $\sim$ 1/7 of the total stellar light. The sample covers a wide range in
bulge luminosity and ... | 9604132v1 |
1996-06-17 | The variable iron K emission line in MCG-6-30-15 | We report on the variability of the iron K emission line in the Seyfert 1
galaxy MCG--6-30-15 during a four-day ASCA observation. The line consists of a
narrow core at an energy of about 6.4 keV, and a broad red wing extending to
below 5 keV, which are interpreted as line emission arising from the inner
parts of an acc... | 9606103v1 |
1996-08-03 | New beryllium observations in low-metallicity stars | We present observations of the Be II 313.0 nm resonance doublet in 14 halo
and old disk stars with metallicities ranging from [Fe/H]=-0.4 to about -3.0
obtained with the CASPEC spectrograph of the ESO 3.6m telescope at a FWHM about
8.6 km/s resolution. Abundances are derived by means of the synthetic spectra
technique ... | 9608011v1 |
1996-09-15 | Multiwavelength observations of isolated neutron stars as a tool to probe the properties of their surfaces | We show that an analysis of multiwavelength observations of isolated neutron
stars based on neutron star atmosphere models can be used not only to evaluate
the neutron star effective temperature, but also to determine chemical
composition of its surface. To demonstrate how this new method can be applied
to a specific o... | 9609097v2 |
1996-10-16 | An X-ray spectral study of 24 type-1 AGN | I present a study of the X-ray spectral properties of a sample containing 24
type-1 active galactic nuclei using the medium spectral resolution of ``ASCA''.
The sample consists of 20 radio-quiet objects and 4 radio-loud objects. A
simple power-law continuum absorbed by Galactic material provides a very poor
description... | 9610127v1 |
1996-12-10 | An Investigation of Neutrino-Driven Convection and the Core Collapse Supernova Mechanism Using Multigroup Neutrino Transport | We investigate neutrino-driven convection in core collapse supernovae and its
ramifications for the explosion mechanism. We begin with an ``optimistic'' 15
solar mass precollapse model, which is representative of the class of stars
with compact iron cores. This model is evolved through core collapse and bounce
in one d... | 9612107v1 |
1997-01-08 | A new chemo-evolutionary population synthesis model for early-type galaxies. II: Observations and Results | We present here the results of applying a new chemo-evolutionary stellar
population model developed by ourselves in a previous paper (Vazdekis et al.
1996) to new high quality observational data of the nuclear regions of two
representative elliptical galaxies and the bulge of the Sombrero galaxy. Here
we fit in detail ... | 9701036v1 |
1997-02-24 | A New Approach to Determine the Initial Mass Function in the Solar Neighborhood | Oxygen to iron abundance ratios of metal-poor stars provide information on
nucleosynthesis yields from massive stars which end in Type II supernova
explosions. Using a standard model of chemical evolution of the Galaxy we have
reproduced the solar neighborhood abundance data and estimated the oxygen and
iron yields of ... | 9702205v2 |
1997-07-15 | Rotating Astrophysical Systems and a Gauge Theory Approach to Gravity | We discuss three applications of a gauge theory of gravity to rotating
astrophysical systems. The theory employs gauge fields in a flat Minkowski
background spacetime to describe gravitational interactions. The iron
fluorescence line observed in AGN is discussed, assuming that the line
originates from matter in an accr... | 9707165v1 |
1997-10-28 | Chemical abundances in the young galaxy at z=2.309 towards PHL 957 | We present high-resolution UES spectra of the quasar PHL 957 obtained for
studying the foreground Damped Ly-alpha galaxy at z=2.309. Measurements of
absorption lines lead to accurate abundance determinations of Fe, S and N which
complement measurements of Zn, Cr and Ni already available for this system. We
find [Fe/H]=... | 9710314v1 |
1997-12-02 | Detecting Compton Reflection and a Broad Iron Line in MCG-5-23-16 with the Rossi X-ray Timing Explorer | We report the detection with the Rossi X-ray Timing Explorer of a Compton
reflection signature in the Seyfert galaxy MCG-5-23-16. RXTE also resolves the
Fe K-alpha fluorescence line with FWHM ~48,000 km s^{-1}. This measurement
provides the first independent confirmation of ASCA detections in Seyfert
galaxies of broad ... | 9712035v2 |
1997-12-03 | Resonance Averaged Photoionization Cross Sections for Astrophysical Models | We present ground state photoionization cross sections of atoms and ions
averaged over resonance structures for photoionization modeling of
astrophysical sources. The detailed cross sections calculated in the
close-coupling approximation using the R-matrix method, with resonances
delineated at thousands of energies, ar... | 9712037v1 |
1997-12-25 | Broadening of the Iron emission line in MCG-6-30-15 by Comptonization | We show that the Iron K emission line from MCG-6-30-15 could be broadened due
to Comptonization by a surrounding highly ionized cloud with radius $\sim
10^{14}$ cms. We calculate the temperature of the cloud to be $\sim0.21\kev$,
provided a reasonable estimate of the UV flux is made. The X-ray/$\gamma$-ray
emission obs... | 9712327v1 |
1998-02-11 | The 6.4 keV Fluorescent Iron Line from Cluster Cooling Flows | For the inner region of the cooling flow (e.g. within the radius of
$\sim$50--100 kpc) the Thomson optical depth of the hot gas in a massive
cooling flow can be as large as $\sim 0.01$. Assuming that the cooling time in
the inner region is few times shorter than the life time of the cluster, the
Thomson depth of the ac... | 9802130v1 |
1998-04-23 | The broad-band X-ray spectrum of Mrk 3 | We have used non-simultaneous Ginga, ASCA and ROSAT observations to
investigate the complex X-ray spectrum of the Seyfert 2 galaxy Mrk 3. We find
that the composite spectrum can be well described in terms of a heavily cut-off
hard X-ray continuum, iron K_alpha emission and a soft X-ray excess, with
spectral variability... | 9804247v1 |
1998-05-05 | Chemical composition and fundamental parameters of roAp stars | Element abundances of three roAp stars, HD 166473, HD 203932, and HD 217522,
were determined using Kurucz model atmospheres with metal abundances scaled to
solar ones and the results were compared with data from the literature
concerning three further roAp stars, normal B and A stars and two lambda Bootis
stars. Up to ... | 9805037v1 |
1998-07-01 | Magnetic Dipole Microwave Emission from Dust Grains | Thermal fluctuations in the magnetization of interstellar grains will produce
magnetic dipole emission at frequencies below ~100 GHz. We show how to
calculate absorption and emission from small particles composed of magnetic
materials. The Kramers-Kronig relations for a dusty medium are generalized to
include the possi... | 9807009v1 |
1998-08-03 | Cloud model of the mean quasar spectrum | We assume a distribution of clouds optically thick for electron scattering
(OTCM) which are moderately optically thin for absorption and we consider them
as a model of the mean quasar spectrum of Laor et al. (1997). We show that the
model is particularly sensitive to the value of the ionization parameter $\xi$
and that... | 9808014v1 |
1998-08-10 | The Enrichment History of Hot Gas in Poor Galaxy Groups | We have analyzed the ASCA SIS and GIS data for seventeen groups and
determined the average temperature and abundance of the hot x-ray emitting gas.
For groups with gas temperatures less than 1.5 keV we find that the abundance
is correlated with the gas temperature and luminosity. We have also determined
the abundance o... | 9808085v1 |
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