cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Neural Network Reconstruction of Late-Time Cosmology and Null Tests
Creators: name: Dialektopoulos, Konstantinos
name: Said, Jackson Levi
name: Mifsud, Jurgen
name: Sultana, Joseph
name: Adami, Kristian Zarb
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: The prospect of nonparametric reconstructions of cosmological parameters from observational data sets has been a popular topic in the literature for a number of years. This has mainly taken the form of a technique based on Gaussian processes but this approach is exposed to several foundational issues ranging from overfitting to kernel consistency problems. In this work, we explore the possibility of using artificial neural networks (ANN) to reconstruct late-time expansion and large scale structure cosmological parameters. We first show how mock data can be used to design an optimal ANN for both parameters, which we then use with real data to infer their respective redshift profiles. We further consider cosmological null tests with the reconstructed data in order to confirm the validity of the concordance model of cosmology, in which we observe a mild deviation with cosmic growth data.
description: 28 pages, 9 figures
Sub-Poissonian atom-number distributions by means of Rydberg dressing and electromagnetically induced transparency
Creators: name: Cano, Daniel
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A method is proposed to produce atomic ensembles with sub-Poissonian atom number distributions. The method consists of removing the excess atoms using the interatomic interactions induced by Rydberg dressing. The selective removal of atoms occurs via spontaneous decay into untrapped states using an electromagnetically induced transparency scheme. Ensembles with the desired number of atoms can be produced almost deterministically. Numerical simulations predict a strong reduction of the atom number fluctuations, with the variance twenty times less than the Poisson noise level (the predicted Fano factor is F = 0.05). Strikingly, the method is suitable for both fermions and bosons. It solves the problem of the atom-number fluctuations in bosons, whose weak interactions have usually been an obstacle to controlling the number of atoms.
САВДО СОҲАСИГА ОИД РЕКЛАМАЛАР КЛАССИФИКАЦИЯСИ
Creators: name: Шербоев, Носир
Publisher: name: Zenodo
Year: 2024

description: Биз тадқиқ этаётган савдо риторикасида ҳар бир грамматик, фонетик ёки стилистик восита жуда муҳим саналади. Тижорат нутқи қанча риторикага бой бўлса, шунча маьноли ва таьсирчан бўлади.  Е. Н. Голубкова ўзининг “Маркетинговые коммуникации” асарида риториканинг асосий аспекти бўлмиш савдо нотиқлигини иккига – оғзаки реклама ва тақдимотдаги нутққа ажратади.
Influence of the Raman depolarisation ratio on far-field radiation patterns in coherent anti-Stokes Raman scattering (CARS) microscopy
Creators: name: Gachet, D.
name: Sandeau, N.
name: Rigneault, H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Optics (physics.optics)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: We propose a full-vectorial numerical study of far field radiation patterns in coherent anti-Stokes Raman scattering (CARS) microscopy. We emphasis the particular role of the Raman depolarisation ratio of the observed medium and show how it modifies the radiation pattern of thin objects.
Supplementary document for Multispectral indices for real-time and non-invasive tissue ischemia monitoring using snapshot cameras - 6693608.pdf
Creators: name: De Winne, Jens
name: Strumane, Anoek
name: Babin, Danilo
name: Luthman, Siri
name: Luong, Hiep
name: Philips, Wilfried
Publisher: name: Optica Publishing Group
Year: 2024
Subjects: Uncategorized

description: Supplement
Supplementary document for Multispectral indices for real-time and non-invasive tissue ischemia monitoring using snapshot cameras - 6619489.pdf
Creators: name: De Winne, Jens
name: Strumane, Anoek
name: Babin, Danilo
name: Luthman, Siri
name: Luong, Hiep
name: Philips, Wilfried
Publisher: name: Optica Publishing Group
Year: 2024
Subjects: Uncategorized

description: Supplemental figures and text to the paper
Landscape of Modular Symmetric Flavor Models
Creators: name: Ishiguro, Keiya
name: Kobayashi, Tatsuo
name: Otsuka, Hajime
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the moduli stabilization from the viewpoint of modular flavor symmetries. We systematically analyze stabilized moduli values in possible configurations of flux compactifications, investigating probabilities of moduli values and showing which moduli values are favorable from our moduli stabilization. Then, we examine their implications on modular symmetric flavor models. It is found that distributions of complex structure modulus $τ$ determining the flavor structure are clustered at a fixed point with the residual $\mathbb{Z}_3$ symmetry in the $SL(2,\mathbb{Z})$ fundamental region. Also, they are clustered at other specific points such as intersecting points between $|τ|^2=k/2$ and ${\rm Re}\,τ=0,\pm 1/4, \pm1/2$, although their probabilities are less than the $\mathbb{Z}_3$ fixed point. In general, CP-breaking vacua in the complex structure modulus are statistically disfavored in the string landscape. Among CP-breaking vacua, the values ${\rm Re}\,τ=\pm 1/4$ are most favorable in particular when the axio-dilaton $S$ is stabilized at ${\rm Re}\,S=\pm 1/4$. That shows a strong correlation between CP phases originated from string moduli.
description: 39 pages, 10 figures
Observations on the Darboux coordinates for rigid special geometry
Creators: name: Ferrara, Sergio
name: Macia, Oscar
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We exploit some relations which exist when (rigid) special geometry is formulated in real symplectic special coordinates $P^I=(p^Λ,q_Λ), I=1,...,2n$. The central role of the real $2n\times 2n$ matrix $M(\Re \mathcal{F},\Im \mathcal{F})$, where $\mathcal{F} = \partial_Λ\partial_ΣF$ and $F$ is the holomorphic prepotential, is elucidated in the real formalism. The property $MΩM=Ω$ with $Ω$ being the invariant symplectic form is used to prove several identities in the Darboux formulation. In this setting the matrix $M$ coincides with the (negative of the) Hessian matrix $H(S)=\frac{\partial^2 S}{\partial P^I\partial P^J}$ of a certain hamiltonian real function $S(P)$, which also provides the metric of the special Kähler manifold. When $S(P)=S(U+\bar U)$ is regarded as a "Kähler potential'' of a complex manifold with coordinates $U^I=\frac12(P^I+iZ^I)$, then it provides a Kähler metric of an hyperkähler manifold which describes the hypermultiplet geometry obtained by c-map from the original n-dimensional special Kähler structure.
description: 15 pages; final version to appear on JHEP. Misprints corrected, references added
Characterization and modelling of a high-Tc superconducting alternating winding capacitor resonator
Creators: name: Mossman, Kaspar David
Publisher: name: University of British Columbia
Year: 2009

description: The characteristics and performance of a novel type of high-Tc superconducting resonator, consisting of two superconducting spirals separated by a low-loss dielectric, have been observed. Experimentally two square spirals of linewidth 50 pm were patterned out of thin films of YBCO and tested in the temperature range 77-90 K. Resonators made from 25-30 turn spirals, which were separated by a 0.0005" teflon sheet, had frequencies in the range 30-60 MHz, and the maximum Q observed was 32,000 at 77 K. An iterative algorithm has been developed to predict the frequency and the fields for the general case where the resonator consists of two arbitrarily shaped spirals, and the spirals are identical except that they are wound in opposite senses about their common axis. The algorithm has been implemented for a 10-turn square spiral with dimensions similar to the experimental thin film resonators, using finite element methods to model the electric and magnetic fields.
Local level statistics for optical and transport properties of disordered systems at finite temperature
Creators: name: Malyshev, A. V.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: It is argued that the (traditional) global level statistics which determines localization and coherent transport properties of disordered systems at zero temperature (e.g. the Anderson model) becomes inappropriate when it comes to incoherent transport. We define local level statistics which proves to be relevant for finite temperature incoherent transport and optics of one-dimensional systems (e.g. molecular aggregates, conjugated polymers, etc.).
description: 4 pages, 2 figures, reported at EXCON'2006, to appear in the physica status solidi (c)
Kelvin's Chirality of Optical Beams
Creators: name: Nechayev, Sergey
name: Eismann, Jörg S.
name: Alaee, Rasoul
name: Karimi, Ebrahim
name: Boyd, Robert W.
name: Banzer, Peter
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Geometrical chirality is a property of objects that describes three-dimensional mirror-symmetry violation and therefore it requires a non-vanishing spatial extent. In contrary, optical chirality describes only the local handedness of electromagnetic fields and neglects the spatial geometrical structure of optical beams. In this manuscript, we put forward the physical significance of geometrical chirality of spatial structure of optical beams, which we term "Kelvin's chirality". Further, we report on an experiment revealing the coupling of Kelvin's chirality to optical chirality upon transmission of a focused beam through a planar medium. Our work emphasizes the importance of Kelvin's chirality in all light-matter interaction experiments involving structured light beams with spatially inhomogeneous phase and polarization distributions.
description: 6 pages, 3 figures
Zahlungsbereitschaftsanalysen in mehrstufigen Labelsystemen. Das Beispiel Tierschutzlabel
Creators: name: Weinrich, Ramona
name: Franz, Dr. Annabell
name: Spiller, Prof. Dr. Achim
Publisher: name: Bundesministerium für Ernährung und Landwirtschaft
Year: 2014

description: Die landwirtschaftliche Nutztierhaltung ist ein aktuelles und kontrovers diskutiertes Thema. Besonders aus Verbrauchersicht ist die Thematik negativ besetzt und wird oft unter dem Begriff "Massentierhaltung" gerahmt. Tatsache ist, dass die Haltungsbedingungen und damit das Tierwohl sich innerhalb der einzelnen Betriebsformen und Betriebe stark unterscheiden. Neben der konventionellen und der ökologischen Tierhaltung entwickelt sich derzeit im Markt eine Zwischenstufe: Ein Haltungssystem, dessen Anforderungen über den gesetzlichen, aber unter den vorgeschriebenen ökologischen Standards liegt. Um diese bestehenden Unterschiede auch innerhalb eines Zertifizierungssystems für Verbraucher sichtbar zu machen, kann ein mehrstufiges Labellingsystem eine Lösung sein. Ein höheres Maß an Tierwohl ist dabei mit höheren Kosten verbunden.

Im vorliegenden Beitrag werden daher an Hand von zwei Fallstudien Zahlungsbereitschaften deutscher Verbraucher für ein mehrstufiges Tierschutzlabel analysiert. Es zeigt sich, dass die entstehenden Mehrkosten der Premiumstufe ohne vertiefte Informationen nicht durch die ermittelten Zahlungsbereitschaften abgedeckt werden können. Um die Zahlungsbereitschaft zu erhöhen, kann eine verbesserte Kommunikationsstrategie, die über die Unterschiede informiert, eine Lösung sein.
description: Berichte über Landwirtschaft - Zeitschrift für Agrarpolitik und Landwirtschaft, Band 92, Heft 2, August 2014
Localized 4f-electrons in the quantum critical heavy fermion ferromagnet CeRh$_6$Ge$_4$
Creators: name: Wang, An
name: Du, Feng
name: Zhang, Yongjun
name: Graf, David
name: Shen, Bin
name: Chen, Ye
name: Liu, Yang
name: Smidman, Michael
name: Cao, Chao
name: Steglich, Frank
name: Yuan, Huiqiu
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Ferromagnetic quantum critical points were predicted to be prohibited in clean itinerant ferromagnetic systems, yet such a phenomenon was recently revealed in CeRh$_6$Ge$_4$, where the Curie temperature can be continuously suppressed to zero under a moderate hydrostatic pressure. Here we report the observation of quantum oscillations in CeRh$_6$Ge$_4$ from measurements using the cantilever and tunnel-diode oscillator methods in fields up to 45 T, clearly demonstrating that the ferromagnetic quantum criticality occurs in a clean system. In order to map the Fermi surface of CeRh$_6$Ge$_4$, we performed angle-dependent measurements of quantum oscillations at ambient pressure, and compared the results to density functional theory calculations. The results are consistent with the Ce 4f electrons remaining localized, and not contributing to the Fermi surface, suggesting that localized ferromagnetism is a key factor for the occurrence of a ferromagnetic quantum critical point in CeRh$_6$Ge$_4$.
description: 12 pages, 3 figures
title: Overview of Clinical Cytogenetics in Mammalian Livestock
Creators: name: Danihel, Maxim Michael-Joe
Publisher: name: University of Kent
Year: 2024

description: Whilst balanced chromosomal aberrations, often do not present phenotypically in carriers they are known to cause reduced fertility in livestock. Mammalian livestock are of vital economic importance with pigs and cattle providing over 50% of consumed meat globally. Furthermore, cattle are the main providers of a dairy industry worth over $750 billion. In an industry where a small population of high value males (boars/bulls/rams) are used in the vast majority of artificial insemination, the potential financial loss caused by a sub-fertile male could be considerable especially if aberrations are passed down to offspring. This thesis reports on recent data collected using novel Multiprobe® Fluorescent in situ Hybridisation (FISH) devices on porcine and bovine blood samples for robust systematic screening of chromosomal abnormalities. There is significant potential for widespread use of these devices as they offer a more sensitive and accurate approach than given with previous methods such as karyotyping. Using this method 775 pigs and 3 cattle were screened. We reported that 14.5% of screened pigs presented with 8 different types of abnormality which is a far higher prevalence then previously recorded by karyotyping. 2 of 3 cattle samples also presented with an abnormality. Our results showed that poor quality of many samples received in 2021-2022 due to delivery complications meant that translocations were undetectable using a standard karyotype. However, FISH works well even with sub-optimal sample quality meaning time and money would not be lost in the repeating of sample collection and delivery. Multiprobe® device analysis is a comprehensive, robust system in bovine and porcine samples therefore, there is potential for it to work in other livestock species. This thesis reports on the use of probes selected for the bovine Multiprobe® device to test the extend they will bind to ovine (sheep) chromosomes to potentially create a novel ovine Multiprobe® device.
Enhancement of functional properties of V$_{0.6}$Ti$_{0.4}$ alloy superconductor by the addition of yttrium
Creators: name: Ramjan, SK.
name: Chandra, L. S. Sharath
name: Singh, Rashmi
name: Ganesh, P.
name: Sagdeo, Archna
name: Chattopadhyay, M. K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We show here that the yttrium is immiscible and precipitates with various sizes in the body centred cubic V$_{0.6}$Ti$_{0.4}$ alloy superconductor. The number and size of the precipitates are found to depend on the amount of yttrium added. Precipitates with various sizes up to 30~$μ$m are found in the V$_{0.6}$Ti$_{0.4}$ alloy containing 5 at.\% yttrium. The large amount of line disorders generated by the addition of yttrium in this alloy are found to be effective in pinning the magnetic flux lines. While the superconducting transition temperature increases with the increasing amount of yttrium in the V$_{0.6}$Ti$_{0.4}$ alloy, the critical current density is maximum for the alloy containing 2 at. \% yttrium, where it is more than 7.5 times the parent alloy in fields higher than 1~T. We found that the effectiveness of each type of defect in pinning the flux lines is dependent on the temperature and the applied magnetic filed.
description: 10 pages, 14 figures, 3 tables
INGLIZ VA O'ZBEK TILLARIDA TEMATIK LUG'ATLAR YARATISHDA ZAMONAVIY TEXNOLOGIYALARNING O'RNI
Creators: name: Alisherova, Shahnoza
Publisher: name: Zenodo
Year: 2024

description: Bugungi jadal rivojlanayotgan raqamli landshaftda zamonaviy texnologiyalarning integratsiyasi til o'rganish va leksikografiyaga bo'lgan munosabatimizni o'zgartirdi. Ingliz va o'zbek tillarida tematik lug'atlarning ishlab chiqilishi lingvistik resurslarning sezilarli o'sishini anglatadi, bu nafaqat tilni o'zlashtirishga, balki madaniy almashinuvga ham yordam beradi. Muayyan mavzular yoki mavzular atrofida tashkil etilgan ushbu lug'atlar o'quvchilarga kontekstli so'z boyligini beradi, ularning turli vaziyatlarda samarali muloqot qilish qobiliyatini oshiradi.
Supplementary document for A SERS microfluidic chip integrated with double amplified signal Off-On strategy for detection of microRNA in NSCLC - 6748936.pdf
Creators: name: Zhu, Jiashan
name: Luo, Jinhua
name: Hua, Zhaolai
name: Feng, Xiang
name: Cao, Xiaowei
Publisher: name: Optica Publishing Group
Year: 2024
Subjects: Uncategorized

description: Supplementary Material
Hidden Breathing Kagome Topology in Hexagonal Transition Metal Dichalcogenides
Creators: name: Jung, Jun
name: Kim, Yong-Hyun
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: A Kagome lattice, formed by triangles of two different directions, is known to have many emergent quantum phenomena. Under the breathing anisotropy of bond strengths, this lattice can become a higher-order topological insulator (HOTI), which hosts topologically protected corner states. Experimental realizations of HOTI on breathing Kagome lattices have been reported for various artificial systems, but not for simple natural materials with an electronic breathing Kagome lattice. Here we prove that a breathing Kagome lattice and HOTI are hidden inside the electronic structure of hexagonal transition metal dichalcogenides (h-TMD). Due to the trigonal prismatic symmetry, $sp^2$-like hybrid d-orbitals create an electronic Kagome lattice with anisotropic inter-site and on-site hopping interactions. We demonstrate that HOTI h-TMD triangular nanoflakes host topologically protected corner states, which could be quantum-mechanically entangled with triple degeneracy. Because h-TMDS are easily synthesizable and stable at ambient conditions, our findings open new avenue for quantum physics based on simple condensed matter systems.
description: 21 pages, 4 figures, Supplementary information
Limiting absorption principle on manifolds having ends with various measure growth rate limits
Creators: name: Kumura, Hironori
Publisher: name: arXiv
Year: 2006
Subjects: subject: Differential Geometry (math.DG)
subject: Spectral Theory (math.SP)
subject: FOS: Mathematics
subject: 58J50, 53C20, 35P05, 47A10

description: The purpose of this paper is to study the property of the resolvent of the Laplace-Beltrami operator on a noncompact complete Riemannian manifold with various ends each of which has a different limit of the growth rate of the Riemannian measure at infinity, in particular, focusing on the limiting absorption principle. As a result, we will obtain the absolute continuity of the Laplace-Beltrami operator.
description: 32 page
New BPS solitons in N=4 gauged supergravity and black holes in Einstein-Yang-Mills-dilaton theory
Creators: name: Canfora, Fabrizio
name: Oliva, Julio
name: Oyarzo, Marcelo
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We start by revisiting the problem of finding BPS solutions in $\mathcal{N}=4$ SU(2)$\times$SU(2) gauged supergravity. We report on a new supersymmetric solution in the Abelian sector of the theory, which describes a soliton that is regular everywhere. The solution is 1/4 BPS and can be obtained from a double analytic continuation of a planar solution found by Klemm in hep-th/9810090. Also in the Abelian sector, but now for a spherically symmetric ansatz we find a new solution whose supersymmetric nature was overlooked in the previous literature. Then, we move to the non-Abelian sector of the theory by considering the meron ansatz for SU(2). We construct electric-meronic and double-meron solutions and show that the latter also leads to 1/4 BPS configurations that are singular and acquire an extra conformal Killing vector. We then move beyond the supergravity embedding of this theory by modifying the self-interaction of the scalar, but still within the same meron ansatz for a single gauge field, which is dilatonically coupled with the scalar. We construct exact black holes for two families of self-interactions that admit topologically Lifshitz black holes, as well as other black holes with interesting causal structures and asymptotic behavior. We analyze some thermal properties of these spacetimes.
description: 36 pages, 5 figures .V2, Minor comments added. Accepted in JHEP
Top and bottom quark forward-backward asymmetries at next-to-next-to-leading order QCD in (un)polarized electron positron collisions
Creators: name: Bernreuther, Werner
name: Chen, Long
name: Lu, Peng-Cheng
name: Si, Zong-Guo
Publisher: name: RWTH Aachen University
Year: 2023
Subjects: subject: 530

description: 24 Seiten (2023). doi:10.48550/arXiv.2301.12632
Sound absorption in Hilbert Fractal and Coiled Acoustic Metamaterials
Creators: name: Comandini, Gianni
name: Khodr, Codor
name: Ting, Valeska
name: Azarpeyvand, Mahdi
name: Scarpa, Fabrizio
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: We describe here a class of acoustic metamaterials with fractal Hilbert space-filling and coiled geometry with equal tortuosity for noise mitigation. Experiments are performed using a four-microphone impedance tube and benchmarked against non-viscous and viscothermal Finite Element models related to configurations spanning up to five fractal/geometry orders. We show that the acoustic absorption can be predicted by the resonance of the cavities associated to the tortuous paths. For a given fractal/geometry order, the acoustic absorption at specific frequencies is also enhanced by maximising the difference between the minimum and maximum fluid particle velocity of the air inside the patterns. These principles can be used to design high-performance acoustic metamaterials for sound absorption over broad frequency ranges.
description: 4 pages, 3 figures, Submitted to Applied Physics Letters
Automated analytical tools : API & artificial intelligence
Creators: name: Lanoy, Lucinda
Publisher: name: Zenodo
Year: 2024
Subjects: subject: Machine learning
subject: Flow Cytometry
subject: Phytoplankton

description: A still in progress method is presented for the automated classification of marine phytoplankton groups observed with flow cytometry data. This method uses the cytometer files converted into JSON files thanks to a conversion tool built from an API meaning the constructor software isn't needed to have access to the cytometer files. The training set of the model was created with particles manually classified in a consensual way by different experts  The model used is a Random Forest and it gives great results, an approach to the tuning of the model's parameters and the selection of the most important predictor variables, to optimise the process and the results, is also presented.
Inclusive 1-jet Production Cross Section at Small x in QCD: Multiple Interactions
Creators: name: Bartels, J.
name: Salvadore, M.
name: Vacca, G. P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study corrections due to two Pomeron exchanges to the inclusive 1-jet production cross section in the Regge limit of perturbative QCD for a finite number of colors. By considering deep inelastic scattering on a weakly bound two-nucleon system, we carefully follow the logic of the AGK cutting rules and show, for the single inclusive cross section, that, due to the reggeization of the gluon, modifications of the AGK cutting rules appear. As our main result, we investigate and calculate the jet production vertex in the presence of a two-Pomeron cut correction. Compared to previous studies, we find a novel structure of the jet vertex which has not been considered before. We discuss a few implications of this new piece.
description: 42 pages, 22 figures, few references and comments added, to appear on JHEP
Holistic Grid Fusion Based Stop Line Estimation
Creators: name: Xu, Runsheng
name: Tafazzoli, Faezeh
name: Zhang, Li
name: Rehfeld, Timo
name: Krehl, Gunther
name: Seal, Arunava
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Intersection scenarios provide the most complex traffic situations in Autonomous Driving and Driving Assistance Systems. Knowing where to stop in advance in an intersection is an essential parameter in controlling the longitudinal velocity of the vehicle. Most of the existing methods in literature solely use cameras to detect stop lines, which is typically not sufficient in terms of detection range. To address this issue, we propose a method that takes advantage of fused multi-sensory data including stereo camera and lidar as input and utilizes a carefully designed convolutional neural network architecture to detect stop lines. Our experiments show that the proposed approach can improve detection range compared to camera data alone, works under heavy occlusion without observing the ground markings explicitly, is able to predict stop lines for all lanes and allows detection at a distance up to 50 meters.
description: Submitted to ICPR2020
[mu]SR studies of the metallic alkali fullerides
Creators: name: MacFarlane, W. Andrew
Publisher: name: University of British Columbia
Year: 2009

description: Results of muon spin rotation (μ-SR) in the metallic intercalated C₆₀ compounds (AnC₆₀, where An are n alkali metal atoms) are presented. Except for the case of K₁C₆₀, the metallic state of these systems is unstable at low temperature (to a superconducting transition in A₃C₆₀ and a magnetic metal insulator transition in A₁C₆₀)- In A₃C₆₀, the properties of the metallic and superconducting states are investigated using i) diamagnetic muons to probe the distribution of internal magnetic field and ii) paramagnetic muonium (Mu) trapped within the C₆₀ cage to probe the electronic excitations. Mu is found to exhibit strong T₁ relaxation due to its interaction with the conduction electrons. In the superconducting state this relaxation rate exhibits a small enhancement (Hebel-Slichter coherence peak) which possesses an anomalously strong magnetic field supression. Exponential temperature dependence of the relaxation rate at low reduced temperature is observed, and from this estimates of the superconducting energy gap are obtained. At very low reduced temperature, deviations from this behaviour are found. Estimates of the magnetic penetration depth from broadening of the diamagnetic precession signal in the vortex state are also presented and discussed. In A₁C₆₀ (A = Rb and Cs), the magnetic state is investigated with zero field μ-SR. Observation of a small rapidly damped oscillation below 2K in Cs₁C₆₀ is the first evidence from μ-SR of magnetic order in these materials. The relaxation at higher temperature indicates that the internal fields are static and possess a broad distribution, indicating a highly disordered static magnetic structure. From the magnitude of the zero field relaxation rates, estimates of the magnitude of the internal field are made.
Effect of heat flux on differential rotation in turbulent convection
Creators: name: Kleeorin, N.
name: Rogachevskii, I.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We studied the effect of the turbulent heat flux on the Reynolds stresses in a rotating turbulent convection. To this end we solved a coupled system of dynamical equations which includes the equations for the Reynolds stresses, the entropy fluctuations and the turbulent heat flux. We used a spectral $τ$ approximation in order to close the system of dynamical equations. We found that the ratio of the contributions to the Reynolds stresses caused by the turbulent heat flux and the anisotropic eddy viscosity is of the order of $\sim 10 (L_ρ/ l_0)^2$, where $l_{0}$ is the maximum scale of turbulent motions and $L_ρ$ is the fluid density variation scale. This effect is crucial for the formation of the differential rotation and should be taken into account in the theories of the differential rotation of the Sun, stars and planets. In particular, we demonstrated that this effect may cause the differential rotation which is comparable with the typical solar differential rotation.
description: 9 pages, 1 figure, REVTEX4, Phys. Rev. E, in press
Letter from F. H. Starr in Calgary, A.B., to James Goldie, February 20, 1911
Creators: name: Starr, F.H.
Publisher: name: The University of British Columbia
Year: 2017

description: Letter to James Goldie from F. H. Starr in Calgary, A.B., dated February 20, 1911, regarding transfer of land to Goldie.
The multiphase and magnetized neutral hydrogen seen by LOFAR
Creators: name: Bracco, Andrea
name: Jelić, Vibor
name: Marchal, Antoine
name: Turić, Luka
name: Erceg, Ana
name: Miville-Deschênes, Marc-Antoine
name: Bellomi, Elena
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Faraday tomography of polarimetric observations at low frequency is a unique tool to study the structure of the magneto-ionic interstellar medium (ISM) based on Faraday depth. LOFAR data below 200 MHz revealed a plethora of features in polarization, whose origin remains unknown. Previous studies highlighted the remarkable association of such features to tracers of the magnetized-neutral ISM, as interstellar dust and atomic hydrogen (HI). However, the physical conditions responsible for the correlation between magneto-ionic and neutral media are yet to be clarified. In this letter we investigate further the correlation between LOFAR data and HI observations at 21cm from the Effelsberg-Bonn HI Survey (EBHIS). We focus on the multiphase properties of the HI gas. We present the first statistical study on the morphological correlation between LOFAR tomographic data and the cold (CNM), luke-warm (LNM), and warm (WNM) HI phases, separately. We use the Regularized Optimization for Hyper-Spectral Analysis (ROHSA) approach to decompose the HI phases based on the Gaussian decomposition of the HI spectra. In at least two fields of view -- Fields 3C196 and A -- out of four -- Fields B and C -- we find a significant correlation between LOFAR and EBHIS data using the Histograms of Oriented Gradients (HOG). The absence of correlation in Fields B and C is caused by low signal-to-noise ratio in polarization. The observed HOG correlation in Fields 3C196 and A is associated with all HI phases and it is surprisingly dominant in the CNM and LNM phases. We discuss possible mechanisms that would explain the correlation between CNM, LNM, and WNM, with polarized emission at Faraday depths up to 10 rad m$^{-2}$. Our results show how the complex structure of the ionic medium seen by LOFAR data is tightly related to phase transition in the diffuse and magnetized neutral ISM traced by HI spectroscopic data.
description: 9 pages, 10 figures, accepted for publication in A&A
A comparison between X-shooter spectra and PHOENIX models across the HR-diagram
Creators: name: Lançon, A.
name: Gonneau, A.
name: Verro, K.
name: Prugniel, P.
name: Arentsen, A.
name: Trager, S. C.
name: Peletier, R.
name: Chen, Y. -P.
name: Coelho, P.
name: Falcón-Barroso, J.
name: Hauschildt, P.
name: Husser, T. -O.
name: Jain, R.
name: Lyubenova, M.
name: Martins, L.
name: Blázquez, P. Sánchez
name: Vazdekis, A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The path towards robust near-infrared extensions of stellar population models involves the confrontation between empirical and synthetic stellar spectral libraries across the wavelength ranges of photospheric emission. [...] With its near-UV to near-IR coverage, the X-shooter Spectral Library (XSL) allows us to examine to what extent models succeed in reproducing stellar energy distributions (SEDs) and stellar absorption line spectra simultaneously. This study compares the stellar spectra of XSL with the PHOENIX spectra of the Göttingen Spectral Library. The comparison is carried out both separately in the three arms of the X-shooter spectrograph, and jointly across the whole spectrum. When adopting the stellar parameters published with data release DR2 of XSL, we find that the SEDs of the models are consistent with those of the data at Teff > 5000 K. Below 5000 K, there are significant discrepancies in the SEDs. When leaving the stellar parameters free to adjust, satisfactory representations of the SEDs are obtained down to about 4000 K. However, in particular below 5000 K and in the UVB spectral range, strong local residuals associated with intermediate resolution spectral features are then seen; the necessity of a compromise between reproducing the line spectra and reproducing the SEDs leads to dispersion between the parameters favored by various spectral ranges. We describe the main trends observed and we point out localized offsets between the parameters preferred in this global fit to the SEDs and the parameters in DR2. These depend in a complex way on position in the HR diagram (HRD). We estimate the effect of the offsets on bolometric corrections as a function of position in the HRD and use this for a brief discussion of their impact on the studies of stellar populations. [abridged]
description: Accepted for publication in Astronomy and Astrophysics (24 Nov. 2020). 18 pages (10 figures) in the main text + 19 pages (22 figures) in the appendices (the appendices are spread out for better readability)
On the possibility of a discontinuous quark-mass dependence of baryon octet and decuplet masses
Creators: name: Semke, A.
name: Lutz, M. F. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We compute the quark-mass dependence of the baryon octet and decuplet masses within the $χ$-MS scheme at the one-loop level. The results are confronted with recent lattice QCD simulations of the MILC collaboration. A fair reproduction of the quark-mass dependence as suggested by the lattice simulations is obtained up to pion masses of about 700 MeV. Based on the chiral one-loop results we predict that the dependence of the baryon octet and decuplet masses on the quark-masses is discontinuous. Typically the pion-mass dependence is smooth up to about 300 MeV only. This is a consequence of self consistency imposed on the partial summation, i.e. the masses used in the loop functions are identical to those obtained from the baryon self energies. The 'mysterious' quark-mass dependence of the Xi mass predicted by the MILC collaboration is recovered in terms of a discontinuous chiral extrapolation.
description: 12 pages, 1 figure, 1 table. 2nd version: corrected typos, clarified conclusions in the summary, results unchanged
The globular clusters and halo of M31
Creators: name: Holland, Stephen
Publisher: name: University of British Columbia
Year: 2009

description: The results of two studies of M31's globular cluster system are presented. One study used deep V- and I-band images of 24 M31 globular clusters taken with CFHT's HRCam. This data is the best available ground-based data for determining structural parameters (such as core and tidal radii, ellipticities, and orientations) for M31's globular clusters. Two-dimensional Michie-King models were fit to each cluster and the results compared to the structural parameters of the Galactic clusters. There is no evidence for any difference between the mean tidal radii and ellipticities of globular clusters in the two galaxies. Core radii and half-mass radii are too strongly affected by seeing to allow a comparison between the two galaxies. The second study used deep HST WFC V- and I-band images of G302 and G312, two globular clusters in M31's halo, to obtain the deepest colour-magnitude diagrams of any M31 globular cluster. Structural parameters were determined for the two clusters and compared to those from the CFHT data. Tidal radii and ellipticities from the CFHT data agree with the more reliable results obtained from HST data. The core radii agree for seeings of ≾ 4 times the cluster's core radius. It is not possible to obtain reliable core parameters for the M31 clusters using ground-based telescopes unless adaptive optics are used to reduce the seeing to ≾ 0”.1. However, the overall sizes and shapes of the clusters can easily be measured if FWHM ≾ 1". Images of M31 clusters obtained from the ground have similar resolutions to those of Virgo globular clusters obtained with the HST's PC. Therefore detailed structural parameters can be obtained for globular clusters in the elliptical galaxies of the Virgo cluster. This thesis also presents the deepest colour-magnitude diagram for M31's halo. There is no evidence for young stars, or of a second parameter problem in M31's halo. The halo stars have [m/H] ~ -0.6 with a spread of -2.0 ≾ [m/H] ≾ -0.2. The M31 halo is ~ 8 times more metal-rich than the Galactic halo and ~ 4 times more metal-rich than the M31 globular cluster system. [Scientific formulae used in this abstract could not be reproduced.]
Dynamics of Scalar Field in Polymer-like Representation
Creators: name: Han, Muxin
name: Ma, Yongge
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In recent twenty years, loop quantum gravity, a background independent approach to unify general relativity and quantum mechanics, has been widely investigated. We consider the quantum dynamics of a real massless scalar field coupled to gravity in this framework. A Hamiltonian operator for the scalar field can be well defined in the coupled diffeomorphism invariant Hilbert space, which is both self-adjoint and positive. On the other hand, the Hamiltonian constraint operator for the scalar field coupled to gravity can be well defined in the coupled kinematical Hilbert space. There are 1-parameter ambiguities due to scalar field in the construction of both operators. The results heighten our confidence that there is no divergence within this background independent and diffeomorphism invariant quantization approach of matter coupled to gravity. Moreover, to avoid possible quantum anomaly, the master constraint programme can be carried out in this coupled system by employing a self-adjoint master constraint operator on the diffeomorphism invariant Hilbert space.
description: 24 pages, accepted for pubilcation in Class. Quant. Grav
ELEKTRON TIJORAT BITIMLARIDA ISTE`MOLCHI HUQUQLARI MASALALARI
Creators: name: Tursunaliyeva, Gulbahor
Publisher: name: Zenodo
Year: 2024

description: Ma`lumki, bugungi kunda Internet onlayn-do`konlar tarmog`i orqali insonlarni zarur maxsulotlar bilan ta`minlashga qaratilgan harakatlarning tez, foydali va boshqa ko`plab imkoniyatlarini taqdim etadi.
Statistical significance of the sterile-neutrino hypothesis in the context of reactor and gallium data
Creators: name: Berryman, Jeffrey M.
name: Coloma, Pilar
name: Huber, Patrick
name: Schwetz, Thomas
name: Zhou, Albert
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We evaluate the statistical significance of the 3+1 sterile-neutrino hypothesis using $ν_e$ and $\barν_e$ disappearance data from reactor, solar and gallium radioactive source experiments. Concerning the latter, we investigate the implications of the recent BEST results. For reactor data we focus on relative measurements independent of flux predictions. For the problem at hand, the usual $χ^2$-approximation to hypothesis testing based on Wilks' theorem has been shown in the literature to be inaccurate. We therefore present results based on Monte Carlo simulations, and find that this typically reduces the significance by roughly $1\,σ$ with respect to the naïve expectation. We find no significant indication in favor of sterile-neutrino oscillations from reactor data. On the other hand, gallium data (dominated by the BEST result) show more than $5\,σ$ of evidence supporting the sterile-neutrino hypothesis, favoring oscillation parameters in agreement with constraints from reactor data. This explanation is, however, in significant tension ($\sim 3\,σ$) with solar neutrino experiments. In order to assess the robustness of the signal for gallium experiments we present a discussion of the impact of cross-section uncertainties on the results.
description: 37 pages plus references, 9 figures. v2: Minor changes, references added. Matches version accepted for publication in JHEP
A Method to Constrain the Total Mass of Galaxy Groups
Creators: name: Pillastrini, G. C. Baiesi
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a simple method to constrain the total mass of groups of galaxies. Tidal theory predicts that a limit to the mass of bound groups of galaxies can be obtained by using the fact that the tidal forces due to the external mass distributions are insufficient to disrupt the groups. To illustrate how the method works, we find tidal limits on the mass of eleven nearby galaxy groups. In most cases, tidal limits placed on these groups show that mass estimations obtained from methods based either on the application of the virial theorem or moments of the projected mass are underestimated by a factor of about 2 even if, in many cases, errors are large. Three groups show virial parameters fully concordant with the tidal constraints while two outlier groups show anomalous results. The irregular state of the latter suggests that the reliability of the method depends on the physical properties of the test groups, which should match the fundamental assumptions of spherical symmetry and dynamical equilibrium state.
description: 12 pages, 2 figures, to appear in New Astronomy, November 2006, Vol. 12, 2 issues
Explorer les REL : comment libérer pour mieux partager
Creators: name: Dube, Marianne
name: Escobar-Zuniga, José-Miguel
Publisher: name: Université de Sherbrooke
Year: 2025
Subjects: Ressources éducatives libres
REL
Creative Commons
Œuvres en usage partagé

description: *Support de présentation pour animer un atelier*

 

Cet atelier permettra aux personnes participantes d’explorer les différentes options de partage de leur matériel pédagogique, en survolant le spectre des licences  : du copyright en passant par le libre accès et les ressources éducatives libres. Elles seront aussi invitées à « libérer une ressource » et à discuter des avantages et des points de vigilance à considérer dans le choix d'une licence ouverte. Les personnes participantes pourront découvrir différentes ressources disponibles, ainsi que les services et outils d’accompagnement qui leur sont offerts pour la création de REL.

 

Objectifs de l'atelier :

Permettre aux personnes participantes de comprendre ce que sont les REL;

Explorer les différentes options de partage (licences) pour leur matériel pédagogique;

Libérer une de ses ressources (mains sur les touches).

 

 
description: Ressources éducatives libres

REL

Open educational resources

OER
description: Discipline : Éducation

Format : Texte/HTML

Type de la ressource : Objet d'apprentissage
Off-shell Higgs production at the LHC as a probe of the trilinear Higgs coupling
Creators: name: Haisch, Ulrich
name: Koole, Gabriël
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: In the context of the Standard Model effective field theory (SMEFT) we examine the constraints on the trilinear Higgs coupling that originate from off-shell Higgs production in proton-proton collisions. Our calculation of the $gg \to h^\ast \to Z Z \to 4 \ell$ process includes two-loop corrections to gluon-gluon-fusion Higgs production and one-loop corrections to the Higgs propagator and its decay. Employing a matrix-element based kinematic discriminant we determine the reach of LHC Run 3 and the high-luminosity option of the LHC in constraining the relevant SMEFT Wilson coefficients. We present constraints that are not only competitive with but also complementary to the projected indirect limits that one expects to obtain from inclusive measurements of single-Higgs production processes at future LHC runs.
description: 29 pages, 9 figures, 3 tables; extended version including a new appendix as accepted for publication in JHEP
Yangians and Mickelsson Algebras I
Creators: name: Khoroshkin, Sergey
name: Nazarov, Maxim
Publisher: name: arXiv
Year: 2006
Subjects: subject: Representation Theory (math.RT)
subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics
subject: 17B35, 81R50

description: We study the composition of the functor from the category of modules over the Lie algebra gl_m to the category of modules over the degenerate affine Hecke algebra of GL_N introduced by I. Cherednik, with the functor from the latter category to the category of modules over the Yangian Y(gl_n) due to V. Drinfeld. We propose a representation theoretic explanation of a link between the intertwining operators on the tensor products of Y(gl_n)-modules, and the `extremal cocycle' on the Weyl group of gl_m defined by D. Zhelobenko. We also establish a connection between the composition of two functors, and the `centralizer construction' of the Yangian Y(gl_n) discovered by G. Olshanski.
description: publication details added. arXiv admin note: substantial text overlap with arXiv:math/0606272