cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
High frequency near-threshhold corrosion fatigue of AISI 316L stainless steel
Creators: name: Fong, Clinton
Publisher: name: University of British Columbia
Year: 2010

description: High frequency corrosion fatigue crack propagation behavior of AISI 316L stainless steel was studied in 1M NaCl and 1M NaCl + 0.01M Na₂S₂O₃, under various anodically and cathodically polarized potentials, and dessicated air at 22°C and 1 atmosphere pressure. Constant load amplitude fracture mechanics techniques employing single edge notch specimens were used to assess the fatigue crack growth rate in the various environments. Unique specimen preparation procedures were developed which allowed near-threshold behaviors to be studied under gradually rising crack tip stress intensity conditions. Polarization studies showed that the presence of thiosulphate catalyzed the dissolution of stainless steel in low pH solutions(pH~1), due to reduction of thiosulphate species to H₂S, but had no effect in the near neutral solutions. Fatigue tests conducted in the neutral NaCl + Na₂S₂O₃ solution at cathodic potentials showed that the presence of thiosulphate had an insignificant effect. This indicated that high frequency fatigue produces efficient exchange of bulk solution with the crack tip environment, which prevented the lowering of pH in the crack by hydrolysis effects and prevented reduction of thiosulphate to H₂S. Fatigue crack retardation phenomena were very pronounced in the near-threshold regions in most of the fatigue tests. The cause of this retardation was attributed mainly to the surface-roughness- induced crack closure effect, which reduced the effective crack tip cyclic stress intensity ΔKth to a lower level. This closure effect only predominated in the near-threshold region where significant Mode II loading was present. The influence of various imposed anodic and cathodic potentials was found to be consistent with the surface-roughness-induced crack closure effects. The observed crack growth accelerating effect of high anodic potentials was attributed to the corresponding high removal rate of surface roughness in the wake of the crack, which kept the effective cyclic stress intensity level near the applied values. Crack fractography was studied by scanning electron microscopy. It showed that the fractography generally consisted of three regions; a crystallographic cleavage-like near-threshold region, a feathery and fibrous transition region, and a striated region. Using an etch pitting technique, it was determined that the crack plane and crack propagation directions in the near-threshold region were mainly those of {111} <110>, {110} <112>, {110} <001>, and other higher indexed planes. These crack orientations were effected by the activation of a single slip system or the alternate activation of two intersecting slip systems.
Is there Anisotropy in Structural Bias?
Creators: name: Vermetten, Diederick
name: Kononova, Anna V.
name: Caraffini, Fabio
name: Wang, Hao
name: Bäck, Thomas
Publisher: name: arXiv
Year: 2021
Subjects: subject: Methodology (stat.ME)
subject: Neural and Evolutionary Computing (cs.NE)
subject: FOS: Computer and information sciences

description: Structural Bias (SB) is an important type of algorithmic deficiency within iterative optimisation heuristics. However, methods for detecting structural bias have not yet fully matured, and recent studies have uncovered many interesting questions. One of these is the question of how structural bias can be related to anisotropy. Intuitively, an algorithm that is not isotropic would be considered structurally biased. However, there have been cases where algorithms appear to only show SB in some dimensions. As such, we investigate whether these algorithms actually exhibit anisotropy, and how this impacts the detection of SB. We find that anisotropy is very rare, and even in cases where it is present, there are clear tests for SB which do not rely on any assumptions of isotropy, so we can safely expand the suite of SB tests to encompass these kinds of deficiencies not found by the original tests. We propose several additional testing procedures for SB detection and aim to motivate further research into the creation of a robust portfolio of tests. This is crucial since no single test will be able to work effectively with all types of SB we identify.
Techno-Economic Assessment Models for 5G
Creators: name: Bendicho, Carlos
Publisher: name: arXiv
Year: 2021
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences
subject: C.2.0; C.2.1; C.2.3; C.2.6; C.2.m

description: This paper proposes the characteristics a techno-economic model for 5G should have considering both mobile network operators perspective and end users needs. It also presents a review and classification of models in the literature based on the characteristics of such theoretical techno-economic reference model. The performed analysis identifies current gaps in the techno-economic modeling literature for 5G architectures and shows it can be enhanced using agile techno-economic models like the Universal Techno-Economic Model (UTEM) created and developed by the author to industrialize assessment of different technological solutions, considering all market players perspectives and applicable to decision-making in multiple domains. This model can be used for an effective and agile 5G techno-economic assessment, including not only network deployment perspective but also customers and end users requirements as well as other stakeholders to select the most adequate 5G architectural solution considering both technical and economic feasibility. UTEM model is currently available for all industry stakeholders under specific license of use.
description: 12 pages, 4 figures, 1 table
Signatures of Strong Correlations in One-Dimensional Ultra-Cold Atomic Fermi Gases
Creators: name: Kakashvili, Paata
name: Bhongale, S. G.
name: Pu, Han
name: Bolech, C. J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Recent success in manipulating ultra-cold atomic systems allows to probe different strongly correlated regimes in one-dimension. Regimes such as the (spin-coherent) Luttinger liquid and the spin-incoherent Luttinger liquid can be realized by tuning the inter-atomic interaction strength and trap parameters. We identify the noise correlations of density fluctuations as a robust observable (uniquely suitable in the context of trapped atomic gases) to discriminate between these two regimes. Finally, we address the prospects to realize and probe these phenomena experimentally using optical lattices.
description: 4 pages, 2 figures
Geospatial Assessment Methodology to Estimate Power Line Restoration Access Vulnerabilities After a Hurricane in Puerto Rico
Creators: C. Birk Jones
Cynthia J. Bresloff
Rachid Darbali-Zamora
Matthew S. Lave
and Erick E. Aponte Bezares
Publisher: name: IEEE
Year: 2022

This paper proposes a methodology for assessing Puerto Rico's infrastructure (i.e., roads and transmission lines) to identify potentially hard to reach areas due to natural risks or distance to roads.
Limited access to transmission lines after a major contingency event can inhibit restoration efforts. After Hurricane Maria, for example, flooding and landslides damaged roads and thus limited travel. Transmission lines are also often situated far from maintained roadways, further limiting the ability to access and repair them. Therefore, this paper proposes a methodology for assessing Puerto Rico's infrastructure (i.e., roads and transmission lines) to identify potentially hard to reach areas due to natural risks or distance to roads. The approach uses geographic information system (GIS) data to define vulnerable areas, that may experience excessive restoration times. The methodology also uses graph theory analysis to find transmission lines with high centrality (or importance). Comparison of these important transmission lines with the vulnerability results found that many reside near roads that are at risk for landslides or floods.
On the lower central series of an associative algebra
Creators: name: Dobrovolska, Galyna
name: Kim, John
name: Ma, Xiaoguang
name: Etingof, Pavel
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Algebra (math.QA)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics

description: This paper continues the study of the lower central series quotients of an associative algebra A, regarded as a Lie algebra, which was started in math/0610410 by Feigin and Shoikhet. Namely, it provides a basis for the second quotient in the case when A is the free algebra in n generators (note that the Hilbert series of this quotient was determined earlier in math/0610410). Further, it uses this basis to determine the structure of the second quotient in the case when A is the free algebra modulo the relations saying that the generators have given nilpotency orders. Finally, it determines the structure of the third and fourth quotient in the case of 2 generators, confirming an answer conjectured in math/0610410. Finally, in the appendix, the results of math/0610410 are generalized to the case when A is an arbitrary associative algebra (under certain conditions on $A$).
description: 23 pages, latex, corrected some more typos
ทักษะและคุณสมบัติที่จำเป็นสำหรับแรงงานยานยนต์ไทย
Creators: name: ธัญญลักษณ์ วีระสมบัติ
Publisher: name: คณะพาณิชยศาสตร์และการบัญชี มหาวิทยาลัยธรรมศาสตร์
Year: 2014
Subjects: ระบบการผลิตแบบลีน, ทักษะทั่วไป, ทักษะสำหรับแผนกงาน, ทักษะเฉพาะ, นิสัยอุตสาหกรรม

description: 144 (ต.ค.-ธ.ค. 57), 37, วารสารบริหารธุรกิจ JBA
Calanticidae Zevina 1978
Creators: name: Innocenti, Gianna
name: Geronimo, Raffaella Di
name: Newman, William A.
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Maxillopoda
Pedunculata
Calanticidae

description: Family Calanticidae Zevina, 1978   Subfamily Calanticinae Zevina, 1978 (nom. trans. Newman 1996)
 Calantica Gray, 1825. Type Scalpellum villosum Leach, 1824 (cf. Newman & Jones 2011) Subfamily Scillaelepadinae Innocenti, Di Geronimo and Newman, nov.
 Scillaelepas Seguenza, 1872. Type † Pollicipes carinata Philippi, 1835
 Gruvelialepas Newman, 1980. Type Scalpellum pilsbryi Gruvel, 1911
 Aurivillialepas Newman, 1980. Type Scalpellum calyculus Aurivillius, 1898
 Newmanilepas Zevina & Yakhontova, 1987 (incertae sedis). Type Scillaelepas mirafica Zevina, 1976
 Definition. Calanticidae with peduncular plates relatively large, covered by an inconspicuous cuticle, capitular plates basically thirteen in number in Scillaelepas (Newman & Jones, 2011). The plates consist of the unpaired rostrum (R), carina (C) and subcarina (SC), and paired rostrolatus (RL), scutum (S), lateral (L), tergum (T) and carinolatus (CL), supplemented with one subrostrum (SR) in Aurivillialepas Newman, 1980, or two subrostrolatera (SR1 and SR2) in Gruvelialepas Newman, 1980. The genus Newmanilepas Zevina & Yakhontova, 1987, represented by Scillaelepas mirafica Zevina, 1976, noted as atypical when first described (Newman 1980), subsequently proved to be an early ontogenetic stage to which a second pair of CLs and a SC are added (Zevina & Yakhontova 1987). Therefore it has been designated an incertae sedis member of the Scillaelepadinae.
 Remarks. Originally, most of the species comprising these four genera were assigned to Scillaelepas s.l. and while new species have since been attributed to Scillaelepas s.s. and Aurivillialepas, there has been no indication they do not form a natural group. Therefore, we recognized them as such. Nonetheless, while the calanticids already consists of two very large, one moderate and three small subfamilies, all but the Pollicipedinae and the new subfamily are in need of thorough revisions. This is especially true of the Calanticinae since what is now known of thoracican genetics (Herrera et al. 2015), the type species, Calantica villosa (Leach, 1824) is among the few species rooting the only wholly scalpellomorph clade. This can be best appreciated when the unsupported nodes of their “maximum clade credibility ultrametric timescaled tree” are collapsed. Unfortunately, to date but a few calanticids and no scillaelepadines have been sequenced.
description: Published as part of Innocenti, Gianna, Geronimo, Raffaella Di & Newman, William A., 2015, A range extension of a deep-sea barnacle of the genus Aurivillialepas (Cirripedia, Scalpellomorpha), a Macaronesian and amphitropical refugial genus having Mesozoic affinities, pp. 257-266 in Zootaxa 3974 (2) on page 258, DOI: 10.11646/zootaxa.3974.2.9, http://zenodo.org/record/239470
Effective Lagrangian at Cubic Order in Electromagnetic Fields and Vacuum Birefringence
Creators: name: Kruglov, S. I.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The effective Lagrangian of electromagnetic fields at the cubic order in field strength has been considered. This generalized Lagrangian is motivated by electrodynamics on non-commutative spaces. We find the canonical and symmetrical energy-momentum tensors and show that they possess non-zero traces. The propagation of a linearly polarized laser beam in the external transverse magnetic field is investigated. We evaluate the induced ellipticity which allows us to obtain a constraint on parameters introduced from the PVLAS experimental data.
description: 10 pages, no figures, added note, published version
Detection of cross-correlation between CMB Lensing and low-density points
Creators: name: Dong, Fuyu
name: Zhang, Pengjie
name: Zhang, Le
name: Yao, Ji
name: Sun, Zeyang
name: Park, Changbom
name: Yang, Xiaohu
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Low Density Points (LDPs, \citet{2019ApJ...874....7D}), obtained by removing high-density regions of observed galaxies, can trace the Large-Scale Structures (LSSs) of the universe. In particular, it offers an intriguing opportunity to detect weak gravitational lensing from low-density regions. In this work, we investigate tomographic cross-correlation between Planck CMB lensing maps and LDP-traced LSSs, where LDPs are constructed from the DR8 data release of the DESI legacy imaging survey, with about $10^6$-$10^7$ galaxies. We find that, due to the large sky coverage (20,000 deg$^2$) and large redshift depth ($z\leq 1.2$), a significant detection ($10σ$--$30σ$) of the CMB lensing-LDP cross-correlation in all six redshift bins can be achieved, with a total significance of $\sim 53σ$ over $ \ell\le1024$. Moreover, the measurements are in good agreement with a theoretical template constructed from our numerical simulation in the WMAP 9-year $Λ$CDM cosmology. A scaling factor for the lensing amplitude $A_{\rm lens}$ is constrained to $A_{\rm lens}=1\pm0.12$ for $z<0.2$, $A_{\rm lens}=1.07\pm0.07$ for $0.2
description: 18 pages, 11 figures; accepted by ApJ
title: Experimental study and modeling of changing mechanical properties in tempering of bainitic-martensitic steels
Creators: name: Vasilyev ,  A.A.
name: Sokolov , D.F.
name: Sokolov , S.F.
Publisher: name: Peter the Great St. Petersburg Polytechnic University
Year: 2021

description: Dependences of mechanical properties (yield stress, tensile stress, relative elongation) and impact toughness on the tempering time at various temperatures have been investigated for 10 industrial bainitic-martensitic steels with a wide range of chemical compositions (C(0.04-0.27), Mn(0.33-1.57), Si(0.22-1.09), Cr(0.02-1.14), Ni(0.01-3.74), Cu(0.02-1.03), Mo(0.01-0.43), Nb(0.002-0.044), V(0.003-0.200), Ti(0.001-0.045), B(≤0.003) (mass.%)). Based on the obtained experimental results, a quantitative model is developed to predict the mechanical properties of the considered steels after tempering. The modeling results comply well with experiments. The average relative errors in predicting the yield and tensile stresses are, respectively, 5.9 and 5.3%, and the average absolute error in predicting the relative elongation is 2.5%.
Constraints on warm dark matter from UV luminosity functions of high-z galaxies with Bayesian model comparison
Creators: name: Rudakovskyi, Anton
name: Mesinger, Andrei
name: Savchenko, Denys
name: Gillet, Nicolas
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The number density of small dark matter (DM) halos hosting faint high-redshift galaxies is sensitive to the DM free-streaming properties. However, constraining these DM properties is complicated by degeneracies with the uncertain baryonic physics governing star formation. In this work, we use a flexible astrophysical model and a Bayesian inference framework to analyse ultra-violet (UV) luminosity functions (LFs) at z=6-8. We vary the complexity of the galaxy model (single vs double power law for the stellar -- halo mass relation) as well as the matter power spectrum (cold DM vs thermal relic warm DM), comparing their Bayesian evidences. Adopting a conservatively wide prior range for the WDM particle mass, we show that the UV LFs at z=6-8 only weakly favour CDM over WDM. We find that particle masses of $\lesssim$2 keV are rejected at a 95% credible level in all models that have a WDM-like power spectrum cutoff. This bound should increase to ~2.5 keV with the James Webb Space Telescope (JWST).
description: prepared for submission to MNRAS
Projeto Multidisciplinar Teoria Literária
Creators: name: de Sousa e Silva Filho, Luis
Publisher: name: Zenodo
Year: 2023
Subjects: George Orwell
Teoria Literária
Novilíngua

description: Neste módulo de estudo relacionado ao Curso de Letras, este projeto multidisciplinar tinha como objetivo principal apontar o gênero literário utilizado pelo autor George Orwell, no livro 1984. Como objetivo secundário, a pesquisa precisava identificar quais eram os principais personagens do livro.
Approaching an investigation of multi-dimensional inequality
through the lenses of variety in models of capitalism
Creators: name: Antonelli, Gilberto
name: Calia, Pinuccia Pasquilina
name: Guidetti, Giovanni
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2014
Subjects: SECS-P/01 Economia politica

description: After a synthetic presentation of the state of poverty and inequality in the world and the contradictions incurred by economic theory in this field after decades of globalization and in the midst of a persisting global crisis, in paragraphs 2. and 3. we outline the rational for our theoretical analysis, underlining two main aspects. First of all, in paragraph 2. we recall the reasons which makes inequality a multidimensional phenomenon, while in paragraph 3. we explore the reasons why the models of capitalism theory is relevant for studying multidimensional inequality. These paragraphs emphasise that inequality is a multidimensional and cumulative phenomenon and it should not be conceived only as the result of the processes of personal and functional distribution of income and wealth, which even by themselves are intrinsically multidimensional. The basic idea is that institutions, the cobweb of relations among them and their interaction with the economic structure define the model of capitalism which characterises a specific country and this, in turn, affects the level and the dynamics of inequality. This approach is consistent with the sociological approach by Rehbein and Souza (2014), based on the analytical framework developed by Pierre Bourdieu.  In paragraph 4. we outline the rational for our empirical analysis, applying the notion of institutional complementarity and examining the relationship between institutional complementarity, models of capitalism and inequality. Besides, refining Amable’s analysis (2003), we provide empirical evidence on the relationship between inequality in income distribution and models of capitalism. Additionally, basing on cluster analysis, we identify six different models of capitalism in a sample of OECD countries, provide preliminary evidence on the different level of inequality which characterises each model and suggest that no evidence supports of the idea that a single model of capitalism is taking shape in this sphere in EU. In paragraph 5. we give some hints about issues in search for a new interpretation capable to fasten together the process of increasing inequality, the notion of symbolic violence and the models of capitalism theory. In the last paragraph we focus on conclusions useful for carrying on our research agenda.
Spontaneous symmetry breaking and finite time singularities in $d$-dimensional incompressible flow with fractional dissipation
Creators: name: Viswanathan, G. M.
name: Viswanathan, T. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We investigate the formation of singularities in the incompressible Navier-Stokes equations in $d\geq 2$ dimensions with a fractional Laplacian $|\nabla |^α$. We derive analytically a sufficient but not necessary condition for solutions to remain always smooth and show that finite time singularities cannot form for $α\geq α_c= 1+d/2$. Moreover, initial singularities become unstable for $α>α_c$.
description: 5 pages
New Indicators for AGN Power: The Correlation Between [O IV] lambda 25.89 micron and Hard X-ray Luminosity for Nearby Seyfert Galaxies
Creators: name: Meléndez, M.
name: Kraemer, S. B.
name: Armentrout, B. K
name: Deo, R. P.
name: Crenshaw, D. M.
name: Schmitt, H. R.
name: Mushotzky, R. F.
name: Tueller, J.
name: Markwardt, C. B.
name: Winter, L.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have studied the relationship between the [O IV] lambda 25.89 micron emission line luminosities, obtained from Spitzer spectra, the X-ray continua in the 2-10 keV band, primarily from ASCA, and the 14-195 keV band obtained with the SWIFT/Burst Alert Telescope (BAT), for a sample of nearby (z < 0.08) Seyfert galaxies. For comparison, we have examined the relationship between the [O III] 5007, the 2-10 keV and the 14-195 keV luminosities for the same set of objects. We find that both the [O IV] and [O III] luminosities are well-correlated with the BAT luminosities. On the other hand, the [O III] luminosities are better-correlated with 2-10 keV luminosities than are those of [O IV]. When comparing [O IV] and [O III] luminosities for the different types of galaxies, we find that the Seyfert 2's have significantly lower [O III] to [O IV] ratios than the Seyfert 1's. We suggest that this is due to more reddening of the narrow line region (NLR) of the Seyfert 2's. Assuming Galactic dust to gas ratios, the average amount of extra reddening corresponds to a hydrogen column density of ~ few times 10^21 cm^-2, which is a small fraction of the X-ray absorbing columns in the Seyfert 2's. The combined effects of reddening and the X-ray absorption are the probable reason why the [O III] versus 2-10 keV correlation is better than the [O IV] versus 2-10 keV, since the [O IV] emission line is much less affected by extinction. Overall, we find the [O IV] to be an accurate and truly isotropic indicator of the power of the AGN. This suggests that it can be useful in deconvolving the contribution of the AGN and starburst to the spectrum of Compton-thick and/or X-ray weak sources.
description: Accepted for publication in the Astrophysical Journal. 31 pages, 6 figures, 4 tables
Decomposition Strategy for Districts as Renewable Energy Hubs
Creators: Luise Middelhauve
Cédric Terrier
and François Maréchal
Publisher: name: IEEE
Year: 2022

The aim of this paper is to define a novel concept of renewable energy hubs and to optimize its design strategy at the district scale in an appropriate computational time.
In light of the energy transition, it becomes a widespread solution to decentralize and to decarbonize energy systems. However, limited transformer capacities are a hurdle for large-scale integration of solar energy in the electricity grid. The aim of this paper is to define a novel concept of renewable energy hubs and to optimize its design strategy at the district scale in an appropriate computational time. To overcome runtime issues, the Dantzig–Wolfe decomposition method is applied to a mixed-integer linear programming framework of the renewable energy hub. Distributed energy units as well as centralized district units are considered. In addition, a method to perform multi-objective optimization as well as respecting district grid constraints in the decomposition algorithm is presented. The decomposed formulation leads to a convergence below 20 min for 31 buildings and a mip gap lower than 0.2%. The centralized design enhances the photovoltaic penetration in the energy mix and reduces the global warming potential and necessary curtailment in order to respect transformer capacity constraints.
Ordinary-derivative formulation of conformal totally symmetric arbitrary spin bosonic fields
Creators: name: Metsaev, R. R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Conformal totally symmetric arbitrary spin bosonic fields in flat space-time of even dimension greater than or equal to four are studied. Second-derivative (ordinary-derivative) formulation for such fields is developed. We obtain gauge invariant Lagrangian and the corresponding gauge transformations. Gauge symmetries are realized by involving the Stueckelberg and auxiliary fields. Realization of global conformal boost symmetries on conformal gauge fields is obtained. Modified de Donder gauge condition and de Donder-Stueckelberg gauge condition are introduced. Using the de Donder-Stueckelberg gauge frame, equivalence of the ordinary-derivative and higher-derivative approaches is demonstrated. On-shell degrees of freedom of the arbitrary spin conformal field are analyzed. Ordinary-derivative light-cone gauge Lagrangian of conformal fields is also presented. Interrelations between the ordinary-derivative gauge invariant formulation of conformal fields and the gauge invariant formulation of massive fields are discussed.
description: 51 pages, v2: Results and conclusions of v1 unchanged. In Sec.3, brief review of higher-derivative approaches added. In Sec.4, new representations for Lagrangian, modified de Donder gauge, and de Donder-Stueckelberg gauge added. In Sec.5, discussion of interrelations between the ordinary-derivative and higher-derivative approaches added. Appendices A,B,C,D and references added
Constraining dark matter annihilation with cosmic ray antiprotons using neural networks
Creators: name: Kahlhoefer, Felix
name: Korsmeier, Michael
name: Krämer, Michael
name: Manconi, Silvia
name: Nippel, Kathrin
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Machine Learning (cs.LG)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: The interpretation of data from indirect detection experiments searching for dark matter annihilations requires computationally expensive simulations of cosmic-ray propagation. In this work we present a new method based on Recurrent Neural Networks that significantly accelerates simulations of secondary and dark matter Galactic cosmic ray antiprotons while achieving excellent accuracy. This approach allows for an efficient profiling or marginalisation over the nuisance parameters of a cosmic ray propagation model in order to perform parameter scans for a wide range of dark matter models. We identify importance sampling as particularly suitable for ensuring that the network is only evaluated in well-trained parameter regions. We present resulting constraints using the most recent AMS-02 antiproton data on several models of Weakly Interacting Massive Particles. The fully trained networks are released as DarkRayNet together with this work and achieve a speed-up of the runtime by at least two orders of magnitude compared to conventional approaches.
Impact of MV Standards on Shipboard DC Cable System Size
Creators: Chathan M. Cooke
Joshua Malone
and Chryssostomos Chryssostomidis
Publisher: name: IEEE
Year: 2022

This work's objective is to harmonize the information within MVAC standards to produce prospective design and test values for shipboard MVDC cables and evaluate their impact on cable system sizes.
There is rising interest in medium-voltage direct current (MVDC) power systems for several reasons, including compatibility with DC loads and avoidance of alternating current (AC) frequency synchronization issues when combining multiple source outputs (Cuzner and Singh, 2017). However, few MVDC systems are currently in operation, and there is relatively little experience compared to the knowledge available for medium-voltage alternating current (MVAC) systems. Presently, IEEE Std. 1709 is the only standard that provides guidance for MVDC systems (IEEE, Inc., 2018). This work's objective is to harmonize the information within MVAC standards to produce prospective design and test values for shipboard MVDC cables and evaluate their impact on cable system sizes. Standards for MVAC cable design and test parameters including Basic Lightning Impulse Insulation Level, Withstand Voltage, and cable insulation thickness are compiled to understand the range of parameter values deemed acceptable for MVAC cables. Based on existing shipboard MVAC standards and IEEE Std. 1709, this study produces prospective design and test values for a shipboard MVDC system with a 12 kV Nominal System Voltage. Additionally, a tradeoff was identified with the thickness of cable insulation where a small reduction in cable system size can be achieved but at the expense of substantially greater electric stresses within the insulation.
Packing-Dimension Profiles and Fractional Brownian Motion
Creators: name: Khoshnevisan, Davar
name: Xiao, Yimin
Publisher: name: arXiv
Year: 2007
Subjects: subject: Probability (math.PR)
subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 60G15, 60G17, 28A80

description: In order to compute the packing dimension of orthogonal projections Falconer and Howroyd (1997) introduced a family of packing dimension profiles ${\rm Dim}_s$ that are parametrized by real numbers $s>0$. Subsequently, Howroyd (2001) introduced alternate $s$-dimensional packing dimension profiles $\hbox{${\rm P}$-$\dim$}_s$ and proved, among many other things, that $\hbox{${\rm P}$-$\dim$}_s E={\rm Dim}_s E$ for all integers $s>0$ and all analytic sets $E\subseteq\R^N$. The goal of this article is to prove that $\hbox{${\rm P}$-$\dim$}_s E={\rm Dim}_s E$ for all real numbers $s>0$ and analytic sets $E\subseteq\R^N$. This answers a question of Howroyd (2001, p. 159). Our proof hinges on a new property of fractional Brownian motion.
Theory of Activated Transport in Bilayer Quantum Hall Systems
Creators: name: Roostaei, Bahman
name: Mullen, Kieran J.
name: Fertig, Herbert A.
name: Simon, Steven H.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We analyze the transport properties of bilayer quantum Hall systems at total filling factor $ν=1$ in drag geometries as a function of interlayer bias, in the limit where the disorder is sufficiently strong to unbind meron-antimeron pairs, the charged topological defects of the system. We compute the typical energy barrier for these objects to cross incompressible regions within the disordered system using a Hartree-Fock approach, and show how this leads to multiple activation energies when the system is biased. We then demonstrate using a bosonic Chern-Simons theory that in drag geometries, current in a single layer directly leads to forces on only two of the four types of merons, inducing dissipation only in the drive layer. Dissipation in the drag layer results from interactions among the merons, resulting in very different temperature dependences for the drag and drive layers, in qualitative agreement with experiment.
description: 4 pages, 2 figures
Charged Black Holes in a Rotating Gross-Perry-Sorkin Monopole Background
Creators: name: Tomizawa, Shinya
name: Ishibashi, Akihiro
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present a new class of stationary charged black hole solutions to five-dimensional Einstein-Maxwell-Chern-Simons theories. We construct the solutions by utilizing so called the squashing transformation. At infinity, our solutions behave as a four-dimensional flat spacetime plus a `circle' and hence describe a Kaluza-Klein black hole. More precisely, our solutions can be viewed as a charged rotating black hole in a rotating Gross-Perry-Sorkin monopole background with the black hole rotation induced from the background rotation.
description: 25 pages, 6 figures
Inverse Renormalization Group based on Image Super-Resolution using Deep Convolutional Networks
Creators: name: Shiina, Kenta
name: Mori, Hiroyuki
name: Tomita, Yusuke
name: Lee, Hwee Kuan
name: Okabe, Yutaka
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The inverse renormalization group is studied based on the image super-resolution using the deep convolutional neural networks. We consider the improved correlation configuration instead of spin configuration for the spin models, such as the two-dimensional Ising and three-state Potts models. We propose a block-cluster transformation as an alternative to the block-spin transformation in dealing with the improved estimators. In the framework of the dual Monte Carlo algorithm, the block-cluster transformation is regarded as a transformation in the graph degrees of freedom, whereas the block-spin transformation is that in the spin degrees of freedom. We demonstrate that the renormalized improved correlation configuration successfully reproduces the original configuration at all the temperatures by the super-resolution scheme. Using the rule of enlargement, we repeatedly make inverse renormalization procedure to generate larger correlation configurations. To connect thermodynamics, an approximate temperature rescaling is discussed. The enlarged systems generated using the super-resolution satisfy the finite-size scaling.
description: accepted for publication in Scientific Reports
Slides for: Phasor Measurement Units optimization in Smart Grids
Creators: Priya Nitin Gokhale
Publisher: name: IEEE
Year: 2022

Slides for a Webinar on Phasor Measurement Units optimization in Smart Grids
This webinar will cover Phasor Measurement Units (PMU) optimization in Smart Grids, it is elaborated with artificial neural networks (ANN)
Learning Objectives:
1) Understand features of PMU and its application
2) Use of ANN for PMU optimization
3) Proposed method for detection of phase angles at Vs and Vr where maximum power will flow
Conclusion: The results obtained from ANN model are compared with Electrical Transient Analyzer Program (ETAP). The predicted & targeted results become equal by training  neural network. Deep neural networks can be used for complex networks and near real time applications.
One-loop Self-energy and Counterterms in a Massive Yang-Mills Theory based on the Nonlinearly Realized Gauge Group
Creators: name: Bettinelli, Daniele
name: Ferrari, Ruggero
name: Quadri, Andrea
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this paper we evaluate the self-energy of the vector mesons at one loop in our recently proposed subtraction scheme for massive nonlinearly realized SU(2) Yang-Mills theory. We check the fulfillment of physical unitarity. The resulting self-mass can be compared with the value obtained in the massive Yang-Mills theory based on the Higgs mechanism, consisting in extra terms due to the presence of the Higgs boson (tadpoles included). Moreover we evaluate all the one-loop counterterms necessary for the next order calculations. By construction they satisfy all the equations of the model (Slavnov-Taylor, local functional equation and Landau gauge equation). They are sufficient to make all the one-loop amplitudes finite through the hierarchy encoded in the local functional equation.
description: 26 pages, 12 figures, minor changes, final version accepted by Phys. Rev. D, typos corrected in eqs.(8),(17),(27),(28)
A Deep Reinforcement Learning Approach to Audio-Based Navigation in a Multi-Speaker Environment
Creators: name: Giannakopoulos, Petros
name: Pikrakis, Aggelos
name: Cotronis, Yannis
Publisher: name: arXiv
Year: 2021
Subjects: subject: Sound (cs.SD)
subject: Machine Learning (cs.LG)
subject: Audio and Speech Processing (eess.AS)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In this work we use deep reinforcement learning to create an autonomous agent that can navigate in a two-dimensional space using only raw auditory sensory information from the environment, a problem that has received very little attention in the reinforcement learning literature. Our experiments show that the agent can successfully identify a particular target speaker among a set of $N$ predefined speakers in a room and move itself towards that speaker, while avoiding collision with other speakers or going outside the room boundaries. The agent is shown to be robust to speaker pitch shifting and it can learn to navigate the environment, even when a limited number of training utterances are available for each speaker.
description: To be published in ICASSP 2021
Additional file 1 of Using behavioral insights to design implementation strategies in public mental health settings: a qualitative study of clinical decision-making
Creators: name: Last, Briana S.
name: Schriger, Simone H.
name: Timon, Carter E.
name: Frank, Hannah E.
name: Buttenheim, Alison M.
name: Rudd, Brittany N.
name: Fernandez-Marcote, Sara
name: Comeau, Carrie
name: Sosunmolu Shoyinka
name: Rinad S. Beidas
Publisher: name: figshare
Year: 2021
Subjects: subject: Medicine
subject: Neuroscience
subject: Biotechnology
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Cancer
subject: 111714 Mental Health
subject: FOS: Health sciences

description: Additional file 1. Qualitative Interview Guide.
Additional file 2 of Using behavioral insights to design implementation strategies in public mental health settings: a qualitative study of clinical decision-making
Creators: name: Last, Briana S.
name: Schriger, Simone H.
name: Timon, Carter E.
name: Frank, Hannah E.
name: Buttenheim, Alison M.
name: Rudd, Brittany N.
name: Fernandez-Marcote, Sara
name: Comeau, Carrie
name: Sosunmolu Shoyinka
name: Rinad S. Beidas
Publisher: name: figshare
Year: 2021
Subjects: subject: Medicine
subject: Neuroscience
subject: Biotechnology
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Cancer
subject: 111714 Mental Health
subject: FOS: Health sciences

description: Additional file 2. Behavioral Insights Coding Process and Results.
Angular distribution studies on the two-photon ionization of hydrogen-like ions: Relativistic description
Creators: name: Koval, Peter
name: Fritzsche, Stephan
name: Surzhykov, Andrey
Publisher: name: arXiv
Year: 2007
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: The angular distribution of the emitted electrons, following the two-photon ionization of the hydrogen-like ions, is studied within the framework of second order perturbation theory and the Dirac equation. Using a density matrix approach, we have investigated the effects which arise from the polarization of the incoming light as well as from the higher multipoles in the expansion of the electron--photon interaction. For medium- and high-Z ions, in particular, the non-dipole contributions give rise to a significant change in the angular distribution of the emitted electrons, if compared with the electric-dipole approximation. This includes a strong forward emission while, in dipole approxmation, the electron emission always occurs symmetric with respect to the plane which is perpendicular to the photon beam. Detailed computations for the dependence of the photoelectron angular distributions on the polarization of the incident light are carried out for the ionization of H, Xe$^{53+}$, and U$^{91+}$ (hydrogen-like) ions.
description: 16 pages, 4 figures, published in J Phys B
Porto Oscillation Code (POSC)
Creators: name: Monteiro, Mario J. P. F. G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The Porto Oscillation Code (POSC) has been developed in 1995 and improved over the years, with the main goal of calculating linear adiabatic oscillations for models of solar-type stars. It has also been used to estimate the frequencies and eigenfunctions of stars from the pre-main sequence up to the sub-giant phase, having a mass between 0.8 and 4 solar masses. The code solves the linearised perturbation equations of adiabatic pulsations for an equilibrium model using a second order numerical integration method. The possibility of using Richardson extrapolation is implemented. Several options for the surface boundary condition can be used. In this work we briefly review the key ingredients of the calculations, namely the equations, the numerical scheme and the output.
description: Accepted for publication in Astrophysics and Space Sciences
Galaxy Clusters in the IRAC Dark Field I: Growth of the red sequence
Creators: name: Krick, J. E.
name: Surace, J. A.
name: Thompson, D.
name: Ashby, M. L. N.
name: Hora, J. L.
name: Gorjian, V.
name: Yan, L.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Using three newly identified galaxy clusters at z~1 (photometric redshift) we measure the evolution of the galaxies within clusters from high redshift to the present day by studying the growth of the red cluster sequence. The clusters are located in the Spitzer Infrared Array Camera (IRAC) Dark Field, an extremely deep mid-infrared survey near the north ecliptic pole with photometry in 18 total bands from X-ray through far-IR. Two of the candidate clusters are additionally detected as extended emission in matching Chandra data in the survey area allowing us to measure their masses to be M_{500}= 6.2 \pm 1.0 \times 10^{13} and 3.6 \pm 1.1 \times 10^{13} solar masses. For all three clusters we create a composite color magnitude diagram in rest-frame B-K using our deep HST and Spitzer imaging. By comparing the fraction of low luminosity member galaxies on the composite red sequence with the corresponding population in local clusters at z=0.1 taken from the COSMOS survey, we examine the effect of a galaxy's mass on its evolution. We find a deficit of faint galaxies on the red sequence in our z~1 clusters which implies that more massive galaxies have evolved in clusters faster than less massive galaxies, and that the less massive galaxies are still forming stars in clusters such that they have not yet settled onto the red sequence.
description: 10 pages including 6 figures and 1 table, ApJ accepted
Lie and Leibniz Algebras of Lower-Degree Conservation Laws
Creators: name: Elfimov, Boris M.
name: Sharapov, Alexey A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 70S10, 81T70, 83C40

description: A relationship between the asymptotic and lower-degree conservation laws in (non-)linear gauge theories is considered. We show that the true algebraic structure underlying asymptotic charges is that of Leibniz rather than Lie. The Leibniz product is defined through the derived bracket construction for the natural Poisson brackets and the BRST differential. Only in particular, though not rare, cases that the Poisson brackets of lower-degree conservation laws vanish modulo central charges, the corresponding Leibniz algebra degenerates into a Lie one. The general construction is illustrated by two standard examples: Yang-Mills theory and Einstein's gravity.
description: 28 pages; v2: minor corrections, a reference added; v3 typos corrected
title: Μελέτη της επίδρασης σεισμικών ρηγμάτων σε χερσαίους αγωγούς φυσικού αερίου - υδρογόνου
title: Assessment of the seismic faults impact on onshore natural gas - hydrogen pipelines

Creators: name: Πωποτα Αλεξανδρα
Publisher: name: Technical University of Crete
Year: 2025

description: Σκοπός της παρούσας εργασίας είναι η διερεύνηση της δυνατότητας μετατροπής των αγωγών μεταφοράς φυσικού αερίου σε σύστημα μεταφοράς μίγματος φυσικού αερίου - υδρογόνου ή και αποκλειστικά υδρογόνου, ενώ η έμφαση θα δοθεί στη διερεύνηση της απόκρισης τέτοιων αγωγών σε συνθήκες διάρρηξης ενεργού σεισμικού ρήγματος μέχρι την επιφάνεια του εδάφους με τη βοήθεια του λογισμικού ABAQUS

description: The transition to «green» energy resources constitutes a major issue to a more sustainable and environment-friendly future. With the widespread use of renewable energy sources, the development of energy-efficient technologies, and the implementation of «green» policies, humanity is moving towards a framework where energy production and consumption will comply with planet's resources. This transition does not only refer to the replacement of energy resources, but also the construction of an efficient energy infrastructure which will support a more «green» economy. In this manner, on the one hand, the natural and human-made environment is protected, while on the other hand, innovation and sustainability are encouraged. In this context, hydrogen is considered the purest fuel of the future and its use is the most suitable choice for a successful energy transition. New technologies, assist in achieving energy independence and reducing carbon dioxide emissions, while they also play a crucial part in promoting hydrogen as main fuel in transportations.
The transfer of natural gas and hydrogen mixture, or even solely hydrogen, through pipelines constitutes an important step towards «green» energy. Generally, the adoption of hydrogen in the economy, represents a significant challenge, since there are many technical issues and hazards that must be resolved. An important issue is the safe transfer from the production and storage sites to urban areas. The development of the appropriate transportation system is a key parameter, and has already started and is expected to be further developed in the near future, by utilizing the existing networks of natural gas pipelines.
Such large-scale pipelines cover long distances and very often face seismic and other geohazards. Active seismic faults constitute a major threat in the transfer of hydrocarbons, and hydrogen in the shortcoming. Many incidents of severe pipeline damages occurred due to the rupture of seismic faults. Consequently, it is of paramount importance to understand the characteristics of the kinematic stress of pipelines due to seismic faulting to minimize their seismic vulnerability. The aim of the present study is to investigate the conversion of natural gas transmission pipelines to transfer a mixture of natural gas and hydrogen, or even exclusively hydrogen. Emphasis is given on examining the response of such pipelines under active seismic fault rupture.