cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Infrared lessons for ultraviolet gravity: the case of massive gravity and Born-Infeld
Creators: name: Jiménez, Jose Beltrán
name: Heisenberg, Lavinia
name: Olmo, Gonzalo J.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We generalize the ultraviolet sector of gravitation via a Born-Infeld action using lessons from massive gravity. The theory contains all of the elementary symmetric polynomials and is treated in the Palatini formalism. We show how the connection can be solved algebraically to be the Levi-Civita connection of an effective metric. The non-linearity of the algebraic equations yields several branches, one of which always reduces to General Relativity at low curvatures. We explore in detail a {\it minimal} version of the theory, for which we study solutions in the presence of a perfect fluid with special attention to the cosmological evolution. In vacuum we recover Ricci-flat solutions, but also an additional physical solution corresponding to an Einstein space. The existence of two physical branches remains for non-vacuum solutions and, in addition, the branch that connects to the Einstein space in vacuum is not very sensitive to the specific value of the energy density. For the branch that connects to the General Relativity limit we generically find three behaviours for the Hubble function depending on the equation of state of the fluid, namely: either there is a maximum value for the energy density that connects continuously with vacuum, or the energy density can be arbitrarily large but the Hubble function saturates and remains constant at high energy densities, or the energy density is unbounded and the Hubble function grows faster than in General Relativity. The second case is particularly interesting because it could offer an interesting inflationary epoch even in the presence of a dust component. Finally, we discuss the possibility of avoiding certain types of singularities within the minimal model.
description: 31 pages, 3 figures (Journal version, references added)
Геологический разлом как геодинамическая машина, производящая катастрофы различных масштабов
Creators: name: Сибиряков Борис Петрович
name: Прилоус Борис Иванович
Publisher: name: Физическая мезомеханика
Year: 2010
Subjects: БЛОЧНЫЕ СРЕДЫ
ВНУТРЕННЕЕ ТРЕНИЕ
УДЕЛЬНАЯ ПОВЕРХНОСТЬ
КАТАСТРОФЫ

description: Статья посвящена исследованию уравнений равновесия и движения сред со структурой. Ранее опубликованные работы в этом направлении, связанные с отказом от сплошности среды и построением нового континуума, обладающего внутренней геометрией, привели к тому, что уравнения равновесия и движения оказались уравнениями бесконечного порядка. Причина появления таких уравнений в том, что разностные и дифференциальные операторы не переходят друг в друга автоматически. Этому препятствует конечный размер структуры, который связан с удельной поверхностью пор и трещин. Наличие большого числа степеней свободы у структурированных тел вызывает, помимо обычных продольных и поперечных волн, также множество волн с очень низкими скоростями, ничем снизу не ограниченных. В случае строго периодических структур неустойчивости возникают лишь для достаточно высоких частот, таких что длина волны соизмерима с размерами структуры. Однако для структур, случайно организованных, с большой дисперсией линейных размеров, неустойчивости возникают для низких частот. Геологические разломы как раз и являются структурами с очень большим разнообразием размеров отдельных блоков, так что внутреннее трение практически единственный стабилизирующий фактор, препятствующий появлению неустойчивых состояний. Снижение коэффициента трения вследствие появления флюидов или локального разогрева приводит к тому, что подобные структуры постоянно находятся в неустойчивом состоянии под влиянием любых периодических возмущений, в частности под влиянием лунных приливов.
Kepler-432 b: a massive warm Jupiter in a 52-day eccentric orbit transiting a giant star
Creators: name: Ortiz, Mauricio
name: Gandolfi, Davide
name: Reffert, Sabine
name: Quirrenbach, Andreas
name: Deeg, Hans J.
name: Karjalainen, Raine
name: Montañes-Rodríguez, Pilar
name: Nespral, David
name: Nowak, Grzegorz
name: Osorio, Yeisson
name: Palle, Enric
Publisher: name: arXiv
Year: 2014
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We study the Kepler object Kepler-432, an evolved star ascending the red giant branch. By deriving precise radial velocities from multi-epoch high-resolution spectra of Kepler-432 taken with the CAFE spectrograph at the 2.2m telescope of Calar Alto Observatory and the FIES spectrograph at the Nordic Optical Telescope of Roque de Los Muchachos Observatory, we confirm the planetary nature of the object Kepler-432 b, which has a transit period of 52 days. We find a planetary mass of Mp=5.84 +\- 0.05 Mjup and a high eccentricity of e=0.478 +\- 0.004. With a semi-major axis of a=0.303 +\- 0.007 AU, Kepler-432 b is the first bona fide warm Jupiter detected to transit a giant star. We also find a radial velocity linear trend of 0.44 +\- 0.04 m s$^{-1}$ d$^{-1}$, which suggests the presence of a third object in the system. Current models of planetary evolution in the post-main-sequence phase predict that Kepler-432 b will be most likely engulfed by its host star before the latter reaches the tip of the red giant branch.
description: 5 pages, 3 figures. Accepted for publication in A&A. Updated title and corrected typos. See also paper by Ciceri et al
Did planet formation occur only recently? Evidences from the GAIA DR3 data
Creators: name: Swastik, C.
Publisher: name: Zenodo
Year: 2023

description: The impact of the GAIA space mission on astronomy has been substantial, as it has provided a precise and uniform data set for over 1 billion stars and other celestial objects within the Milky Way and beyond. The accuracy of stellar parameters obtained from GAIA has greatly benefited exoplanet science. In this investigation, we utilized the latest Gaia DR3 data, combining photometric, astrometric, and spectroscopic data to explore the kinematic and chemical age proxies of 2611 exoplanets and their host stars with uniformly determined parameters. Through the Radial Velocity Spectrometer (RVS) onboard GAIA, we demonstrate that stars that host massive planets are metal-rich and α-poor in contrast to those with smaller planets. Our kinematic analysis indicates that the stellar systems hosting small planets and those with giant planets exhibit significant differences in galactic space velocity and orbital parameters, which are indicative of age. Specifically, we observed a statistically significant difference of 0.06 kpc for Zmax and 0.03 for eccentricity. Additionally, we utilized the MESA isochrone models to estimate the ages of the sample's stars. Our findings reveal that hosts of giant planetary systems are younger than the population of stars hosting small planets, consistent with the chemical evolution of the galaxy and the formation of giant planets via the core-accretion process.
Mapping the gravitational-wave background
Creators: name: Renzini, Arianna
Publisher: name: Imperial College London
Year: 2020

description: Given the recent detection of gravitational waves (GWs) from individual sources it is almost a certainty that some form of background of gravitational waves will be detected in future. The most promising candidates for such a detection are backgrounds made up of the incoherent superposition of the signal of unresolved astrophysical or, possibly, earlier primordial sources. Such backgrounds will also be anisotropic as they would trace the distribution of the underlying sources and the anisotropy may also be detected. To this end, this thesis presents Gravitational Wave Background (GWB) map-making algorithms that use the cross-correlation of multiple data streams. The resulting maps are maximum likelihood representations of the GWB intensity on the sky. Two different methods are developed, depending on whether the detector timestreams may be considered uncorrelated or not. These are then tailored to two GW detector classes, ground-based interferometers and the Laser Interferometer Space Antenna (LISA), and tested on mock data as proof of concept. The mapping method optimised for the Laser Interferometer Gravitational-wave Observatories (LIGOs) is applied to LIGO open data sets, providing the most stringent upper limits to the GWB yet. These are obtained assuming a spectral model for the signal which weights the data and optimises the search. A novel, model-independent estimation scheme is also presented. The method applied to LISA provides the first full-likelihood map estimator from LISA data. The aim of this work is to deliver the framework of the LISA GWB map-making pipeline which will be progressively refined and updated until data become available.
Figures of merit for a stochastic gravitational-wave background measurement by LISA: implications of LISA Pathfinder noise correlations
Creators: name: Boileau, Guillaume
name: Christensen, Nelson
name: Meyer, Renate
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: An important goal of the Laser Interferometer Space Antenna (LISA) is to observe a stochastic gravitational-wave background (SGWB). A study of possible correlated noise in LISA is relevant to establish limits for this future measurement. To test noise investigation methods under somewhat realistic conditions, we use the data of LISA Pathfinder (LPF). We calculate the coherence between the LPF differential acceleration of the two test-masses with magnetic fields, temperature, and micronewton cold gas thruster activity in the spacecraft. We apply our observed correlations to LISA, and estimate how the presence of such correlated noise would affect its search for a SGWB. In the context of a figure of merit, we estimate the effect of noise on the LISA SGWB search.
Karaoker: Alignment-free singing voice synthesis with speech training data
Creators: name: Kakoulidis, Panos
name: Ellinas, Nikolaos
name: Vamvoukakis, Georgios
name: Markopoulos, Konstantinos
name: Sung, June Sig
name: Jho, Gunu
name: Tsiakoulis, Pirros
name: Chalamandaris, Aimilios
Publisher: name: arXiv
Year: 2022
Subjects: subject: Audio and Speech Processing (eess.AS)
subject: Machine Learning (cs.LG)
subject: Sound (cs.SD)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Existing singing voice synthesis models (SVS) are usually trained on singing data and depend on either error-prone time-alignment and duration features or explicit music score information. In this paper, we propose Karaoker, a multispeaker Tacotron-based model conditioned on voice characteristic features that is trained exclusively on spoken data without requiring time-alignments. Karaoker synthesizes singing voice and transfers style following a multi-dimensional template extracted from a source waveform of an unseen singer/speaker. The model is jointly conditioned with a single deep convolutional encoder on continuous data including pitch, intensity, harmonicity, formants, cepstral peak prominence and octaves. We extend the text-to-speech training objective with feature reconstruction, classification and speaker identification tasks that guide the model to an accurate result. In addition to multitasking, we also employ a Wasserstein GAN training scheme as well as new losses on the acoustic model's output to further refine the quality of the model.
description: Accepted to INTERSPEECH 2022
Micromechanics of particle-coated bubbles: deformation from quasistatic to millisecond timescales
Creators: name: Saha, Saikat
Publisher: name: Imperial College London
Year: 2020

description: Particles adsorbed at fluid-fluid interfaces confer stability to dispersed systems such as foams and emulsions. The emergent properties associated with the interfacial microstructure underpins the creation of functional materials. In the design, synthesis and application of such materials, it is essential to understand the dynamic behaviour of structured interfaces at deformation timescales that are relevant in practical scenarios. In this experiment-driven study, a bubble is used as a probe to understand the stability mechanisms and dynamics of fluid-fluid interfaces coated with particles. First, in a model wax-based oil foam, or oleofoam, bubble dissolution time, under controlled conditions, is used as a parameter to assess the bulk and interfacial rheological contributions responsible for the remarkable stability observed. Focus is then drawn to interfacial phenomena, by removing bulk effects, through microscopic observations of crystal-coated bubbles undergoing deformation due to either bubble dissolution or ultrasound-driven volumetric oscillations. In this way phenomena at two extreme timescales, 10,000 s and 0.0001 s, are observed and interpreted. Finally, the effect of unsteady, fast deformation on a complex interface is systematically studied using a well characterised model interface, comprising of bubbles coated with optically resolvable, monodisperse latex microspheres. The bubbles are subjected to acoustic forcing, leading to the rapid cyclic compression and expansion of the colloidal monolayer. Effects of pressure amplitude, particle size and surface coverage on bubble excursions are studied. The results signify the importance of local mesoscopic phenomena in explaining the stability of oleofoams, where invoking macroscopic rheological reasoning alone is somewhat inadequate. Experimental timescales strongly influence the nature, integrity and response of complex interfaces to imposed stresses. Further, a bubble driven by ultrasound has potential in studying time-dependent interfacial mechanics.
S1W1
Creators: name: Aebig, Adam
Year: 2024
Subjects: subject: Mesoamerica
valueUri: https://core.tdar.org/browse/geographic-keyword/61/mesoamerica
subject: Basin of Mexico
valueUri: https://core.tdar.org/browse/geographic-keyword/3/basin-of-mexico
subject: Mexico
valueUri: https://core.tdar.org/browse/geographic-keyword/134/mexico
subject: Mexico (State / Territory)
valueUri: https://core.tdar.org/browse/geographic-keyword/326/mexico-state-territory
subject: United Mexican States (Country)
valueUri: https://core.tdar.org/browse/geographic-keyword/438/united-mexican-states-country
subject: Central Mexico, Teotihuacan Valley
valueUri: https://core.tdar.org/browse/geographic-keyword/7/central-mexico-teotihuacan-valley
subject: Central Mexico
valueUri: https://core.tdar.org/browse/geographic-keyword/135/central-mexico
subject: Teotihuacan Valley
valueUri: https://core.tdar.org/browse/geographic-keyword/154/teotihuacan-valley
subject: Teotihuacan
valueUri: https://core.tdar.org/browse/geographic-keyword/202/teotihuacan
subject: Valley of Mexico
valueUri: https://core.tdar.org/browse/geographic-keyword/44/valley-of-mexico
subject: Classic Period
valueUri: https://core.tdar.org/browse/temporal-keyword/125/classic-period
subject: Terminal Formative
valueUri: https://core.tdar.org/browse/temporal-keyword/67/terminal-formative
subject: Teotihuacan Period
valueUri: https://core.tdar.org/browse/temporal-keyword/7765/teotihuacan-period
subject: Early Classic
valueUri: https://core.tdar.org/browse/temporal-keyword/5560/early-classic
subject: Teotihuacan
valueUri: https://core.tdar.org/browse/culture-keyword/7527/teotihuacan
subject: Teotihuacano
valueUri: https://core.tdar.org/browse/culture-keyword/9224/teotihuacano
subject: Teotihuacan
valueUri: https://core.tdar.org/browse/site-name/92/teotihuacan
subject: Town / City
valueUri: https://core.tdar.org/browse/site-type/255/town-city
subject: Domestic Structure or Architectural Complex
valueUri: https://core.tdar.org/browse/site-type/251/domestic-structure-or-architectural-complex
subject: Settlements
valueUri: https://core.tdar.org/browse/site-type/252/settlements
subject: Systematic Survey
valueUri: https://core.tdar.org/browse/investigation-type/12/systematic-survey

description: Site Survey Form From Square S1W1
The Next Generation BLAST Experiment
Creators: name: Galitzki, Nicholas
name: Ade, Peter A. R.
name: Angilè, Francesco E.
name: Ashton, Peter
name: Beall, James A.
name: Becker, Dan
name: Bradford, Kristi J.
name: Che, George
name: Cho, Hsiao-Mei
name: Devlin, Mark J.
name: Dober, Bradley J.
name: Fissel, Laura M.
name: Fukui, Yasuo
name: Gao, Jiansong
name: Groppi, Christopher E.
name: Hillbrand, Seth
name: Hilton, Gene C.
name: Hubmayr, Johannes
name: Irwin, Kent D.
name: Klein, Jeffrey
name: Van Lanen, Jeff
name: Li, Dale
name: Li, Zhi-Yun
name: Lourie, Nathan P.
name: Mani, Hamdi
name: Martin, Peter G.
name: Mauskopf, Philip
name: Nakamura, Fumitaka
name: Novak, Giles
name: Pappas, David P.
name: Pascale, Enzo
name: Pisano, Giampaolo
name: Santos, Fabio P.
name: Savini, Giorgio
name: Scott, Douglas
name: Stanchfield, Sara
name: Tucker, Carole
name: Ullom, Joel N.
name: Underhill, Matthew
name: Vissers, Michael R.
name: Ward-Thompson, Derek
Publisher: name: arXiv
Year: 2014
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The Balloon-borne Large Aperture Submillimeter Telescope for Polarimetry (BLASTPol) was a suborbital experiment designed to map magnetic fields in order to study their role in star formation processes. BLASTPol made detailed polarization maps of a number of molecular clouds during its successful flights from Antarctica in 2010 and 2012. We present the next-generation BLASTPol instrument (BLAST-TNG) that will build off the success of the previous experiment and continue its role as a unique instrument and a test bed for new technologies. With a 16-fold increase in mapping speed, BLAST-TNG will make larger and deeper maps. Major improvements include a 2.5 m carbon fiber mirror that is 40% wider than the BLASTPol mirror and ~3000 polarization sensitive detectors. BLAST-TNG will observe in three bands at 250, 350, and 500 microns. The telescope will serve as a pathfinder project for microwave kinetic inductance detector (MKID) technology, as applied to feedhorn coupled submillimeter detector arrays. The liquid helium cooled cryostat will have a 28-day hold time and will utilize a closed-cycle $^3$He refrigerator to cool the detector arrays to 270 mK. This will enable a detailed mapping of more targets with higher polarization resolution than any other submillimeter experiment to date. BLAST-TNG will also be the first balloon-borne telescope to offer shared risk observing time to the community. This paper outlines the motivation for the project and the instrumental design.
Planets Across Space and Time (PAST) III.Morphology of the Planetary Radius Valley as a Function of Stellar Age and Metallicity
Creators: name: Chen, Di-Chang
name: Xie, Ji-Wei
name: Zhou, Ji-Lin
name: Yang, Jia-Yi
name: Dong, Subo
Publisher: name: Zenodo
Year: 2023

description: Over 5,000 exoplanets have been identified and thousands of candidates are to be confirmed. What are the differences between planetary systems in different Galactic environments, and how do they evolve with time? To address these questions, we conduct a research project, dubbed Planets Across Space and Time (PAST). Here we present some first results of PAST series. We revisit the kinematic method for classification of Galactic components and extend the applicable range from ∼ 100 pc to ∼ 1, 500 pc from the sun in order to cover most known planet hosts. Furthermore, we revisit the Age-Velocity dispersion Relation (AVR), which allows us to derive kinematic age with a typical uncertainty of 10-20% for an ensemble of stars. Applying the above revised methods, we present catalogs of kinematic properties as well as other basic stellar parameters for 2174 host stars of 2872 planets and 35,835 Kepler stars. Using the above kinematic catalogs, we perform a systematical investigation into the planetary radius valley morphology in the Galactic context, i.e., thin/thick galactic disks, stellar age and metallicity abundance ([Fe/H] and [α/Fe]).
description: {"references": ["Chen et al. 2022, AJ, 163, 249"]}
Water regulates the residence time of Benzamidine in Trypsin
Creators: name: Ansari, Narjes
name: Rizzi, Valerio
name: Parrinello, Michele
Publisher: name: arXiv
Year: 2022
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: The process of ligand-protein unbinding is crucial in biophysics. Water is an essential part of any biological system and yet, many aspects of its role remain elusive. Here, we simulate with state-of-the-art enhanced sampling techniques the binding of Benzamidine to Trypsin which is a much studied and paradigmatic ligand-protein system. We use machine learning methods to determine efficient collective coordinates for the complex non-local network of water. These coordinates are used to perform On-the-fly Probability Enhanced Sampling simulations, which we adapt to calculate also the ligand residence time. Our results, both static and dynamic, are in good agreement with experiments. We find that the presence of a water molecule located at the bottom of the binding pocket allows via a network of hydrogen bonds the ligand to be released into the solution. On a finer scale, even when unbinding is allowed, another water molecule further modulates the exit time.
Isolate record for VAFB-ISO-497
Creators: name: Holloway, Corinne
Year: 1900
Subjects: subject: Santa Barbara (County)
valueUri: https://core.tdar.org/browse/geographic-keyword/3486/santa-barbara-county
subject: Vandenberg Air Force Base (VAFB)
valueUri: https://core.tdar.org/browse/geographic-keyword/85469/vandenberg-air-force-base-vafb
subject: Vandenberg Space Force Base (VSFB)
valueUri: https://core.tdar.org/browse/geographic-keyword/85584/vandenberg-space-force-base-vsfb
subject: California (State / Territory)
valueUri: https://core.tdar.org/browse/geographic-keyword/1484/california-state-territory
subject: Chipped Stone
valueUri: https://core.tdar.org/browse/material-type/2/chipped-stone
subject: Chert
valueUri: https://core.tdar.org/browse/material-type/213/chert
subject: Reconnaissance / Survey
valueUri: https://core.tdar.org/browse/investigation-type/7/reconnaissance-survey

description: This document is the isolated find record for VAFB-ISO-497. The artifact is a brown Monterey chert flake.
Timelike behavior of the pion electromagnetic form factor in the functional formalism
Creators: name: Sauli, Vladimir
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The electromagnetic form factor of the pion is calculated within the use of functional formalism. We develop integral representation for the minimal set of Standard Model Green's functions and derive the dispersion relation for the form factor in the two flavor QCD isospin limit $m_u=m_d$. We use the dressed quark propagator as obtained form the gap equation in Minkowski space and within the Dyson-Schwinger equations formalism to derive the approximate dispersion relation for the form factor for the first time. We evaluate the form factor for the spacelike as well as for the timelike momentum in the presented formalism. A new Nakanishi-like form of integral representation is proved on the basis of the vector Bethe-Salpeter equation for the quark-photon vector with a ladder-rainbow kernel. The Gauge Technique turns out to be a part of the entire structure of the vertex. In the analytic approach presented here, it is shown that the a large amount of the $ρ$-meson peak in the cross section $e^+e^-\rightarrow π^+π^-$ is governed by the gauge invariance of QED/QCD, i.e. by Gauge Technique constructed quark-photon vertex. This approximation naturally explains the broad shape of the $ρ$-meson peak.
description: 24 pp, 3 figures, exp. data added, up to the style, it is identical with published version
Kepler-432 b: a massive planet in a highly eccentric orbit transiting a red giant
Creators: name: Ciceri, Simona
name: Lillo-Box, Jorge
name: Southworth, John
name: Mancini, Luigi
name: Henning, Thomas
name: Barrado, David
Publisher: name: arXiv
Year: 2014
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We report the first disclosure of the planetary nature of Kepler-432 b (aka Kepler object of interest KOI-1299.01). We accurately constrained its mass and eccentricity by high-precision radial velocity measurements obtained with the CAFE spectrograph at the CAHA 2.2-m telescope. By simultaneously fitting these new data and Kepler photometry, we found that Kepler-432 b is a dense transiting exoplanet with a mass of Mp = 4.87 +/- 0.48 MJup and radius of Rp = 1.120 +/- 0.036 RJup. The planet revolves every 52.5 d around a K giant star that ascends the red giant branch, and it moves on a highly eccentric orbit with e = 0.535 +/- 0.030. By analysing two NIR high-resolution images, we found that a star is located at 1.1 from Kepler-432, but it is too faint to cause significant effects on the transit depth. Together with Kepler-56 and Kepler-91, Kepler-432 occupies an almost-desert region of parameter space, which is important for constraining the evolutionary processes of planetary systems.
description: 4 pages, 5 figures, accepted for publication in A&A Letters. Also see the companion paper by Ortiz et al
La spettacolarizzazione della sicurezza sul lavoro in un sistema che fatica a farsi comprendere
Creators: name: Vella, Luciano
Publisher: name: Diritto della sicurezza sul lavoro
Year: 2023

description: Per un dibattito sulla responsabilità penale del RLS Commento a Cassazione Penale, Sez. 4, 25 settembre 2023, n. 38914
description: Diritto della sicurezza sul lavoro, N. 2 (2023)
Моделирование напряженно-деформированного состояния и потери устойчивости термобарьерного покрытия при тепловом ударе
Creators: name: Люкшин Петр Александрович
name: Люкшин Борис Александрович
name: Матолыгина Наталья Юрьевна
name: Панин Сергей Викторович
Publisher: name: Физическая мезомеханика
Year: 2011
Subjects: ТЕРМОБАРЬЕРНОЕ ПОКРЫТИЕ
КОМПЬЮТЕРНОЕ МОДЕЛИРОВАНИЕ
ПОТЕРЯ УСТОЙЧИВОСТИ
ТЕПЛОПРОВОДНОСТЬ
НАПРЯЖЕННО-ДЕФОРМИРОВАННОЕ СОСТОЯНИЕ

description: B работе проведено компьютерное моделирование деформационного поведения термобарьерных покрытий. Показана возможность возникновения неустойчивостей, имеющих периодический характер. На примере термического нагружения медного образца с керамическим покрытием проведены исследования их характерного периода от свойств сопрягаемых материалов.
Surface Similarity Parameter: A New Machine Learning Loss Metric for Oscillatory Spatio-Temporal Data
Creators: name: Wedler, Mathies
name: Stender, Merten
name: Klein, Marco
name: Ehlers, Svenja
name: Hoffmann, Norbert
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Supervised machine learning approaches require the formulation of a loss functional to be minimized in the training phase. Sequential data are ubiquitous across many fields of research, and are often treated with Euclidean distance-based loss functions that were designed for tabular data. For smooth oscillatory data, those conventional approaches lack the ability to penalize amplitude, frequency and phase prediction errors at the same time, and tend to be biased towards amplitude errors. We introduce the surface similarity parameter (SSP) as a novel loss function that is especially useful for training machine learning models on smooth oscillatory sequences. Our extensive experiments on chaotic spatio-temporal dynamics systems indicate that the SSP is beneficial for shaping gradients, thereby accelerating the training process, reducing the final prediction error, increasing weight initialization robustness, and implementing a stronger regularization effect compared to using classical loss functions. The results indicate the potential of the novel loss metric particularly for highly complex and chaotic data, such as data stemming from the nonlinear two-dimensional Kuramoto-Sivashinsky equation and the linear propagation of dispersive surface gravity waves in fluids.
description: 19 pages, 7 figures, submitted to Elsevier Neural Networks
Asymptotic limits of operators similar to normal operators
Creators: name: Gehér, György Pál
Publisher: name: arXiv
Year: 2014
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: Primary: 47B40, secondary: 47A45, 47B15

description: Sz.-Nagy's famous theorem states that a bounded operator $T$ which acts on a complex Hilbert space $\mathcal{H}$ is similar to a unitary operator if and only if $T$ is invertible and both $T$ and $T^{-1}$ are power bounded. There is an equivalent reformulation of that result which considers the self-adjoint iterates of $T$ and uses a Banach limit $L$. In this paper first we present a generalization of the necessity part in Sz.-Nagy's result concerning operators that are similar to normal operators. In the second part we provide characterization of all possible strong operator topology limits of the self-adjoint iterates of those contractions which are similar to unitary operators and act on a separable infinite-dimensional Hilbert space. This strengthens Sz.-Nagy's theorem for contractions.
description: 13 pages, accepted for publication in Proceedings of the AMS
Exploring the Importance of Financial Risk Management in Derivatives Market
Creators: name: Mst. Anish Prashant Vadalkar
name: Mst.Prasham Vaibhav Lodha
name: Mst.Aashish Anil Khairnar
Publisher: name: Zenodo
Year: 2023

description: The Paper "Exploring the importance of Financial Risk Management in Derivatives Market" focuses on theconceptofderivatives,their importance,andtheroleoffinancialriskanalysisin thederivativesmarket. Derivativesarefinancialinstrumentswhosevaluedependsonunderlyingvariables, oftenlinkedtotradedassets.With the rise of globalization and liberalization, the demand for international currencies and financialinstruments has surged, leading to increased financial risks. Financial derivatives, including futures, optionsswaps, and more, are created to manage these risks. They serve purposes like hedging, speculation, and risktransfer.Riskanalysis iscrucialduetothecomplexity,leverage, and volatility of derivatives.The discussion highlights the complexity of derivatives, including their diverse forms and purposes. The risks associated with derivatives include market risk, counterparty risk, liquidity risk, interconnection risk, strategicrisk,reputationrisk, interest rate risk,transaction risk,socio-politicalrisk, andcountryrisk
description: IJSRED - International Journal of Scientific Research and Engineering Development
Anomalous Weak Values Are Proofs of Contextuality
Creators: name: Pusey, Matthew F.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The average result of a weak measurement of some observable $A$ can, under post-selection of the measured quantum system, exceed the largest eigenvalue of $A$. The nature of weak measurements, as well as the presence of post-selection and hence possible contribution of measurement-disturbance, has led to a long-running debate about whether or not this is surprising. Here, it is shown that such "anomalous weak values" are non-classical in a precise sense: a sufficiently weak measurement of one constitutes a proof of contextuality. This clarifies, for example, which features must be present (and in an experiment, verified) to demonstrate an effect with no satisfying classical explanation.
description: 4 pages. v2: Some typos fixed and some discussions expanded
Unveiling the Secrets of Metallicity and Massive Star Formation Using DLAs along Gamma-ray Bursts
Creators: name: Cucchiara, A.
name: Fumagalli, M.
name: Rafelski, M.
name: Kocevski, D.
name: Prochaska, J. X.
name: Cooke, R. J.
name: Becker, G. D.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present the largest, publicly available, sample of Damped Lyman-$α$ systems (DLAs) along Gamma-ray Bursts (GRB) line of sights in order to investigate the environmental properties of long GRBs in the $z=1.8-6$ redshift range. Compared with the most recent quasar DLAs sample (QSO-DLA), our analysis shows that GRB-DLAs probe a more metal enriched environment at $z\gtrsim3$, up to $[X/H]\sim-0.5$. In the $z=2-3$ redshift range, despite the large number of lower limits, there are hints that the two populations may be more similar (only at 90\% significance level). Also at \hiz, the GRB-DLA average metallicity seems to decline at a shallower rate than the QSO-DLAs: GRB-DLA hosts may be polluted with metals at least as far as $\sim 2$kpc from the GRB explosion site, probably due to previous star-formation episodes and/or supernovae explosions. This shallow metallicity trend, extended now up to $z\sim5$, confirms previous results that GRB hosts are star-forming and have, on average, higher metallicity than the general QSO-DLA population. Finally, our metallicity measurements are broadly consistent with the hypothesis of two channels of GRB progenitors, one of which is mildly affected by a metallicity bias. The metallicity evolution of modeled GRB hosts agrees reasonably well with our data up to intermediate redshift, while more data are needed to constrain the models at $z\gtrsim 4$.
description: 28 pages, 4 figures, Accepted on ApJ
Detecting quantumness in uniform precessions
Creators: name: Zaw, Lin Htoo
name: Aw, Clive Cenxin
name: Lasmar, Zakarya
name: Scarani, Valerio
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Building on work by Tsirelson, we present a family of protocols that detect the nonclassicality of suitable states of a single quantum system, under the sole assumption that the measured dynamical observable undergoes a uniform precession. The case of the harmonic oscillator was anticipated in the work by Tsirelson, which we extend. We then apply the protocols to finite-dimensional spins that undergo uniform precession in real space and find a gap between the classical and the quantum expectations for every $j\geq \frac{3}{2}$ (excluding $j=2$).
description: 17 pages, 4 figures. To appear in Physical Review A
Analysis of fuel spray evaporation and engine particle emissions using optical diagnostics
Creators: name: Apostolou, Christos
Publisher: name: Loughborough University
Year: 2023
Subjects: classificationCode: 401799
subject: Mechanical engineering not elsewhere classified
classificationCode: 400899
subject: Electrical engineering not elsewhere classified
classificationCode: 401499
subject: Manufacturing engineering not elsewhere classified

description: Analysis of fuel spray evaporation and engine particle emissions using optical diagnostics
Statistical mechanics of self-gravitating systems: mixing as a criterion for indistinguishability
Creators: name: Silva, Leandro Beraldo e
name: Lima, Marcos
name: Sodré, Laerte
name: Perez, Jérôme
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We propose an association between the phase-space mixing level of a self-gravitating system and the indistinguishability of its constituents (stars or dark matter particles). This represents a refinement in the study of systems exhibiting incomplete violent relaxation. Within a combinatorial analysis similar to that of Lynden-Bell, we make use of this association to obtain a distribution function that deviates from the Maxwell-Boltzmann distribution, increasing its slope for high energies. Considering the smallness of the occupation numbers for large distances from the center of the system, we apply a correction to Stirling's approximation which increases the distribution slope also for low energies. The distribution function thus obtained presents some resemblance to the "S" shape of distributions associated with cuspy density profiles (as compared to the distribution function obtained from the Einasto profile), although it is not quite able to produce sharp cusps. We also argue how the association between mixing level and indistinguishability can provide a physical meaning to the assumption of particle-permutation symmetry in the N-particle distribution function, when it is used to derive the one-particle Vlasov equation, which raises doubts about the validity of this equation during violent relaxation.
description: Minor changes; Published in PRD
Comparison of time dependent fracture in viscoelastic and ductile solids
Creators: name: Wnuk Michael, P.
name: Alavi Manouchehr
name: Rouzbehani Anousheh
Publisher: name: Физическая мезомеханика
Year: 2012
Subjects: TIME-DEPENDENT FRACTURE
CRACK PROPAGATION
STABILITY OF NONELASTIC FRACTURE
VISCOELASTIC SOLIDS
DUCTILE SOLIDS
MOTION OF CRACKS
PROCESS ZONE
UNIT STEP GROWTH

description: Effects of two parameters on enhancement of the time-dependent fracture manifested by a slow stable crack propagation that precedes catastrophic failure in ductile materials have been studied. One of these parameters is related to the material ductility (ρ) and the other describes the geometry (roughness) of crack surface and is measured by the degree of fractality represented by the fractal exponent α, or — equivalently — by the Hausdorff fractal dimension D for a self-similar crack. These studies of early stages of ductile fracture are preceded by a brief summary of modeling the phenomenon of delayed fracture in polymeric materials, sometimes referred to as “creep rupture”. Despite different physical mechanisms involved in the preliminary stable crack extension and despite different mathematical representations, a remarkable similarity of the end results pertaining to the two phenomena of slow crack growth that occur either in viscoelastic or ductile media has been demonstrated.
Single G centers in silicon fabricated by co-implantation with carbon and proton
Creators: name: Baron, Yoann
name: Durand, Alrik
name: Herzig, Tobias
name: Khoury, Mario
name: Pezzagna, Sébastien
name: Meijer, Jan
name: Robert-Philip, Isabelle
name: Abbarchi, Marco
name: Hartmann, Jean-Michel
name: Reboh, Shay
name: Gérard, Jean-Michel
name: Jacques, Vincent
name: Cassabois, Guillaume
name: Dréau, Anaïs
Publisher: name: arXiv
Year: 2022
Subjects: subject: Applied Physics (physics.app-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We report the fabrication of G centers in silicon with an areal density compatible with single photon emission at optical telecommunication wavelengths. Our sample is made from a silicon-on-insulator wafer which is locally implanted with carbon ions and protons at various fluences. Decreasing the implantation fluences enables to gradually switch from large ensembles to isolated single defects, reaching areal densities of G centers down to $\sim$0.2 $μ$m$^{-2}$. Single defect creation is demonstrated by photon antibunching in intensity-correlation experiments, thus establishing our approach as a reproducible procedure for generating single artificial atoms in silicon for quantum technologies.
Induced gravitational waves from slow-roll inflation after an enhancing phase
Creators: name: Balaji, Shyam
name: Domenech, Guillem
name: Silk, Joseph
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The primordial spectrum of fluctuations may present a large peak as a result of enhancing features during inflation. This may include, but is not limited to, bumps in the inflaton's potential, phases of ultra-slow-roll or turns in multi-field space. However, in many models, inflation does not end immediately after the enhancing feature and it is likely to continue with a second phase of slow-roll. We show that the resulting induced gravitational waves may probe the primordial spectrum from the second inflationary phase, even if its amplitude is too small to directly induce detectable gravitational waves. This is because, if there are sharp peaks in the primordial spectrum, the total gravitational wave spectrum is not simply the sum of gravitational waves induced by a peaked and scale-invariant primordial spectra separately, but cross terms from interaction between these modes also become important. We also find that such cross terms always have a characteristic slope. We discuss the parameter space that may be probed by future gravitational waves detectors in the presence of these signals.
description: 27 pages, 6 figures, 3 appendices
S2E5
Creators: name: Aebig, Adam
Year: 2024
Subjects: subject: Mesoamerica
valueUri: https://core.tdar.org/browse/geographic-keyword/61/mesoamerica
subject: Basin of Mexico
valueUri: https://core.tdar.org/browse/geographic-keyword/3/basin-of-mexico
subject: Mexico
valueUri: https://core.tdar.org/browse/geographic-keyword/134/mexico
subject: Mexico (State / Territory)
valueUri: https://core.tdar.org/browse/geographic-keyword/326/mexico-state-territory
subject: United Mexican States (Country)
valueUri: https://core.tdar.org/browse/geographic-keyword/438/united-mexican-states-country
subject: Central Mexico, Teotihuacan Valley
valueUri: https://core.tdar.org/browse/geographic-keyword/7/central-mexico-teotihuacan-valley
subject: Central Mexico
valueUri: https://core.tdar.org/browse/geographic-keyword/135/central-mexico
subject: Teotihuacan Valley
valueUri: https://core.tdar.org/browse/geographic-keyword/154/teotihuacan-valley
subject: Teotihuacan
valueUri: https://core.tdar.org/browse/geographic-keyword/202/teotihuacan
subject: Valley of Mexico
valueUri: https://core.tdar.org/browse/geographic-keyword/44/valley-of-mexico
subject: Classic Period
valueUri: https://core.tdar.org/browse/temporal-keyword/125/classic-period
subject: Terminal Formative
valueUri: https://core.tdar.org/browse/temporal-keyword/67/terminal-formative
subject: Teotihuacan Period
valueUri: https://core.tdar.org/browse/temporal-keyword/7765/teotihuacan-period
subject: Early Classic
valueUri: https://core.tdar.org/browse/temporal-keyword/5560/early-classic
subject: Teotihuacan
valueUri: https://core.tdar.org/browse/culture-keyword/7527/teotihuacan
subject: Teotihuacano
valueUri: https://core.tdar.org/browse/culture-keyword/9224/teotihuacano
subject: Teotihuacan
valueUri: https://core.tdar.org/browse/site-name/92/teotihuacan
subject: Town / City
valueUri: https://core.tdar.org/browse/site-type/255/town-city
subject: Domestic Structure or Architectural Complex
valueUri: https://core.tdar.org/browse/site-type/251/domestic-structure-or-architectural-complex
subject: Settlements
valueUri: https://core.tdar.org/browse/site-type/252/settlements
subject: Systematic Survey
valueUri: https://core.tdar.org/browse/investigation-type/12/systematic-survey

description: Site Survey Form From Square S2E5
Isolate record for VAFB-ISO-487
Creators: name: Holloway, Corinne
Year: 1900
Subjects: subject: Santa Barbara (County)
valueUri: https://core.tdar.org/browse/geographic-keyword/3486/santa-barbara-county
subject: Vandenberg Air Force Base (VAFB)
valueUri: https://core.tdar.org/browse/geographic-keyword/85469/vandenberg-air-force-base-vafb
subject: Vandenberg Space Force Base (VSFB)
valueUri: https://core.tdar.org/browse/geographic-keyword/85584/vandenberg-space-force-base-vsfb
subject: California (State / Territory)
valueUri: https://core.tdar.org/browse/geographic-keyword/1484/california-state-territory
subject: Chipped Stone
valueUri: https://core.tdar.org/browse/material-type/2/chipped-stone
subject: Chert
valueUri: https://core.tdar.org/browse/material-type/213/chert
subject: Reconnaissance / Survey
valueUri: https://core.tdar.org/browse/investigation-type/7/reconnaissance-survey

description: This document is the isolated find record for VAFB-ISO-487. The artifacts are a black Monterey chert flake and a brown banded Monterey chert core.
Atmospheric Mass Loss During Planet Formation: The Importance of Planetesimal Impacts
Creators: name: Schlichting, Hilke
name: Sari, Re'em
name: Yalinewich, Almog
Publisher: name: arXiv
Year: 2014
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We quantify the atmospheric mass loss during planet formation by examining the contributions to atmospheric loss from both giant impacts and planetesimal accretion. Giant impacts cause global motion of the ground. Using analytic self-similar solutions and full numerical integrations we find (for isothermal atmospheres with adiabatic index ($γ=5/3$) that the local atmospheric mass loss fraction for ground velocities $v_g < 0.25 v_{esc}$ is given by $χ_{loss}=(1.71 v_g/v_{esc})^{4.9}$, where $v_{esc}$ is the escape velocity from the target. Yet, the global atmospheric mass loss is a weaker function of the impactor velocity $v_{Imp}$ and mass $m_{Imp}$ and given by $X_{loss} ~ 0.4x+1.4x^2-0.8x^3$ (isothermal atmosphere) and $X_{loss} ~ 0.4x+1.8x^2-1.2x^3$ (adiabatic atmosphere), where $x=(v_{Imp}m/v_{esc}M)$. Atmospheric mass loss due to planetesimal impacts proceeds in two different regimes: 1) Large enough impactors $m > \sqrt{2} ρ_0 (πh R)^{3/2}$ (25~km for the current Earth), are able to eject all the atmosphere above the tangent plane of the impact site, which is $h/2R$ of the whole atmosphere, where $h$, $R$ and $ρ_0$ are the atmospheric scale height, radius of the target, and its atmospheric density at the ground. 2) Smaller impactors, but above $m>4 πρ_0 h^3$ (1~km for the current Earth) are only able to eject a fraction of the atmospheric mass above the tangent plane. We find that the most efficient impactors (per unit impactor mass) for atmospheric loss are planetesimals just above that lower limit and that the current atmosphere of the Earth could have resulted from an equilibrium between atmospheric erosion and volatile delivery to the atmosphere from planetesimals. We conclude that planetesimal impacts are likely to have played a major role in atmospheric mass loss over the formation history of the terrestrial planets. (Abridged)
description: Submitted to Icarus, 39 pages, 16 figures
Dynamical Modeling and Control of Multiphase Heat Transport Systems Based on Loop Heat Pipes
Creators: name: Gellrich, Thomas Christoph
Publisher: name: Karlsruher Institut für Technologie (KIT)
Year: 2022
Subjects: Dynamische Modellierung
Wärmetransportsystem
Loop Heat Pipe
Nichtlineare Regelung
dynamical modeling
heat transport system
loop heat pipe
nonlinear control

description: Effective heat transport systems in aerospace are based on multiphase loop heat pipes (LHPs). For a precise thermal control of the electronics, electrical heaters are additionally used to control the operating temperature of the LHP. This work focusses on the dynamical modeling and model-based control design for LHP-based heat transport systems. The results of this work can be used for the optimization of current control parameters and the efficient control design for future LHP applications.