cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A dispersive approach to Sudakov resummation
Creators: name: Gardi, Einan
name: Grunberg, Georges
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present a general all-order formulation of Sudakov resummation in QCD in terms of dispersion integrals. We show that the Sudakov exponent can be written as a dispersion integral over spectral density functions, weighted by characteristic functions that encode information on power corrections. The characteristic functions are defined and computed analytically in the large-beta_0 limit. The spectral density functions encapsulate the non-Abelian nature of the interaction. They are defined by the time-like discontinuity of specific effective charges (couplings) that are directly related to the familiar Sudakov anomalous dimensions and can be computed order-by-order in perturbation theory. The dispersive approach provides a realization of Dressed Gluon Exponentiation, where Sudakov resummation is enhanced by an internal resummation of running-coupling corrections. We establish all-order relations between the scheme-invariant Borel formulation and the dispersive one, and address the difference in the treatment of power corrections. We find that in the context of Sudakov resummation the infrared-finite-coupling hypothesis is of special interest because the relevant coupling can be uniquely identified to any order, and may have an infrared fixed point already at the perturbative level. We prove that this infrared limit is universal: it is determined by the cusp anomalous dimension. To illustrate the formalism we discuss a few examples including B-meson decay spectra, deep inelastic structure functions and Drell-Yan or Higgs production.
description: 85 pages
Baxter's Q-operators for supersymmetric spin chains
Creators: name: Bazhanov, Vladimir V.
name: Tsuboi, Zengo
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We develop Yang-Baxter integrability structures connected with the quantum affine superalgebra Uq(\hat sl(2|1)). Baxter's Q-operators are explicitly constructed as supertraces of certain monodromy matrices associated with (q-deformed) bosonic and fermionic oscillator algebras. There are six different Q-operators in this case, obeying a few fundamental fusion relations, which imply all functional relations between various commuting transfer matrices. The results are universal in the sense that they do not depend on the quantum space of states and apply both to lattice models and to continuous quantum field theory models as well.
description: 69 pages, 4 figures, v2: misprints corrected, references added, v3: minor corrections
Language Model Augmented Relevance Score
Creators: name: Liu, Ruibo
name: Wei, Jason
name: Vosoughi, Soroush
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computation and Language (cs.CL)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Although automated metrics are commonly used to evaluate NLG systems, they often correlate poorly with human judgements. Newer metrics such as BERTScore have addressed many weaknesses in prior metrics such as BLEU and ROUGE, which rely on n-gram matching. These newer methods, however, are still limited in that they do not consider the generation context, so they cannot properly reward generated text that is correct but deviates from the given reference. In this paper, we propose Language Model Augmented Relevance Score (MARS), a new context-aware metric for NLG evaluation. MARS leverages off-the-shelf language models, guided by reinforcement learning, to create augmented references that consider both the generation context and available human references, which are then used as additional references to score generated text. Compared with seven existing metrics in three common NLG tasks, MARS not only achieves higher correlation with human reference judgements, but also differentiates well-formed candidates from adversarial samples to a larger degree.
description: In ACL 2021
Exploring Power Conversion Based on Piezoelectrics. Converters-Components and Capabilities-Slides
Creators: Jessica Boles
Publisher: name: IEEE
Year: 2021

PELS Webinar Slides
Abstract: Power electronics are integral to the advancement of transportation, renewable energy, manufacturing, healthcare, information technology, and many other major industries. These technologies increasingly demand power electronics with smaller volume, lighter weight, and lower cost, but such strides are commonly impeded by energy storage components, particularly magnetics. While magnetic components have been central to power electronics since the field's inception, their inherent challenges at small scales motivate investigation of alternative energy storage mechanisms for future miniaturized power conversion. Piezoelectrics, which store energy in the mechanical compliance and inertia of a piezoelectric material, is one such prospect; piezoelectrics show immense promise for high power density and efficiency at small scales.

In this talk, we explore how we can leverage piezoelectrics to enable substantial miniaturization of power electronics. We first identify practical dc-dc converter implementations that most efficiently utilize piezoelectrics as sole energy storage components, without magnetics. Then, we turn to the piezoelectric components themselves and evaluate piezoelectric materials, vibration modes, and geometries based on efficiency and power density capabilities. We further discuss how these capabilities scale to small sizes and how piezoelectric-based converters may pave the way for major advances in converter miniaturization.
Singular limits for the bi-laplacian operator with exponential nonlinearity in $\R^4$
Creators: name: Clapp, Mónica
name: Muñoz, Claudio
name: Musso, Monica
Publisher: name: arXiv
Year: 2007
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: Let $Ω$ be a bounded smooth domain in $\mathbb{R}^{4}$ such that for some integer $d\geq1$ its $d$-th singular cohomology group with coefficients in some field is not zero, then problem {Δ^{2}u-ρ^{4}k(x)e^{u}=0 & \hbox{in}Ω, u=Δu=0 & \hbox{on}\partialΩ, has a solution blowing-up, as $ρ\to0$, at $m$ points of $Ω$, for any given number $m$.
description: 30 pages, to appear in Ann. IHP Non Linear Analysis
Causality in Neural Networks -- An Extended Abstract
Creators: name: Reddy, Abbavaram Gowtham
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Causal reasoning is the main learning and explanation tool used by humans. AI systems should possess causal reasoning capabilities to be deployed in the real world with trust and reliability. Introducing the ideas of causality to machine learning helps in providing better learning and explainable models. Explainability, causal disentanglement are some important aspects of any machine learning model. Causal explanations are required to believe in a model's decision and causal disentanglement learning is important for transfer learning applications. We exploit the ideas of causality to be used in deep learning models to achieve better and causally explainable models that are useful in fairness, disentangled representation, etc.
Christo e il velo che rivela
Creators: name: Pirozzi, Francesca
Publisher: name: Territorio della Ricerca su Insediamenti e Ambiente. Rivista internazionale di cultura urbanistica
Year: 2012

description: Territorio della Ricerca su Insediamenti e Ambiente. Rivista internazionale di cultura urbanistica, No 9 (2012): City and Mega events, yesterday today tomorrow
DPT: Deformable Patch-based Transformer for Visual Recognition
Creators: name: Chen, Zhiyang
name: Zhu, Yousong
name: Zhao, Chaoyang
name: Hu, Guosheng
name: Zeng, Wei
name: Wang, Jinqiao
name: Tang, Ming
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Transformer has achieved great success in computer vision, while how to split patches in an image remains a problem. Existing methods usually use a fixed-size patch embedding which might destroy the semantics of objects. To address this problem, we propose a new Deformable Patch (DePatch) module which learns to adaptively split the images into patches with different positions and scales in a data-driven way rather than using predefined fixed patches. In this way, our method can well preserve the semantics in patches. The DePatch module can work as a plug-and-play module, which can easily be incorporated into different transformers to achieve an end-to-end training. We term this DePatch-embedded transformer as Deformable Patch-based Transformer (DPT) and conduct extensive evaluations of DPT on image classification and object detection. Results show DPT can achieve 81.9% top-1 accuracy on ImageNet classification, and 43.7% box mAP with RetinaNet, 44.3% with Mask R-CNN on MSCOCO object detection. Code has been made available at: https://github.com/CASIA-IVA-Lab/DPT .
description: In Proceedings of the 29th ACM International Conference on Multimedia (MM '21)
Le temps et l'espace dans Désert de Le Clézio
Creators: name: Bentaieb, Mouna
Publisher: name: University of British Columbia
Year: 2010

description: Pour le présent mémoire de maîtrise, nous avons retenu le roman de J.M.G. Le Clézio, Désert, dans lequel nous avons essayé d'analyser le temps et l'espace. Plus brièvement nous avons examiné la fonction des personnages dans ce même roman. Au cours de notre recherche, nous avons appris que l'écriture est le point de départ de la pensée de Le Clézio. La première dimension temporelle du roman est celle de l'histoire. Désert est un roman binaire. Il est divisé en deux grandes parties : l'histoire des hommes bleus et l'histoire de Lalla, jeune immigrée de dix-sept ans. La première est racontée au passé, la deuxième au présent. Le roman n'est pas construit chronologiquement, nous avons choisi le terme de mosaïque pour définir le découpage passë-présent-passé. La composition et le mode narratif permettent d'exprimer le temps ; deux niveaux temporels : le temps de la fiction et le temps de la narration. La multiplicité temporelle, c'est-à-dire temps de l'histoire et temps du récit a constitué une partie de notre étude. Le temps nous a conduit à l'espace qui s'est avéré un point essentiel de notre étude. Il n'est pas seulement le lieu où se joue l'histoire. Espace et description sont indissociables. Nous remarquons que la description chez Le Clézio est étroitement liée à la conscience et à l'état d'âme des personnages. L'espace contribue à l'élaboration de la narration. Sous des formes diverses, la description suggère la découverte de certains mythes dont nous avons analysé la valeur symbolique à travers les images présentées. La fonction des personnages n'est pas dissociable du reste de notre analyse. Lieux et descriptions expliquent les personnages. A travers leur caractère nous retrouvons uneanalyse psychologique et sociale.
SemSegLoss: A python package of loss functions for semantic segmentation
Creators: name: Jadon, Shruti
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Image and Video Processing (eess.IV)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Image Segmentation has been an active field of research as it has a wide range of applications, ranging from automated disease detection to self-driving cars. In recent years, various research papers proposed different loss functions used in case of biased data, sparse segmentation, and unbalanced dataset. In this paper, we introduce SemSegLoss, a python package consisting of some of the well-known loss functions widely used for image segmentation. It is developed with the intent to help researchers in the development of novel loss functions and perform an extensive set of experiments on model architectures for various applications. The ease-of-use and flexibility of the presented package have allowed reducing the development time and increased evaluation strategies of machine learning models for semantic segmentation. Furthermore, different applications that use image segmentation can use SemSegLoss because of the generality of its functions. This wide range of applications will lead to the development and growth of AI across all industries.
description: 8 pages, 2 tables
Karl Pearson's Theoretical Errors and the Advances They Inspired
Creators: name: Stigler, Stephen M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: Karl Pearson played an enormous role in determining the content and organization of statistical research in his day, through his research, his teaching, his establishment of laboratories, and his initiation of a vast publishing program. His technical contributions had initially and continue today to have a profound impact upon the work of both applied and theoretical statisticians, partly through their inadequately acknowledged influence upon Ronald A. Fisher. Particular attention is drawn to two of Pearson's major errors that nonetheless have left a positive and lasting impression upon the statistical world.
description: Published in at http://dx.doi.org/10.1214/08-STS256 the Statistical Science (http://www.imstat.org/sts/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Further study of $f_0(1710)$ with coupled-channel approach and hadron molecular picture
Creators: name: Wang, Zheng-Li
name: Zou, Bing-Song
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The $f_0(1710)$ was previously proposed to be dynamically generated state by interactions between vector mesons. We extend the study of $f_0(1710)$ by including its coupling to channels of pseudoscalar mesons within coupled-channel approach. The channels involved are $K^*\bar{K}^*,ρρ,ωω,ϕϕ, ωϕ,ππ,K\bar{K},ηη$. We show that the pole assigned to $f_0(1710)$ does not change much. Then we calculate the partial decay widths of $f_0(1710) \to K^*\bar{K}^* \to ππ,K\bar{K},ηη$ as the coupled channel dynamically generated state as well as assuming it to be pure $K^*\bar{K}^*$ molecule. In both cases the ratios of partial decay widths agree fairly with that in PDG.
ANALYSIS OF THE EFFECT OF TRANSISTOR AND MOSFET IN MAGNETIC COIL WIRELESS POWER TRANSFER
Creators: name: M. FITRA ZAMBAK
name: CATRA INDRA CAHYADI
name: SYAFRUDIN HASAN
name: SUWARNO
name: ROHANA
Publisher: name: Zenodo
Year: 2023
Subjects: Wireless Power Magnetic Coil Transistor Mosfet.

description: Abstract

The current development of wireless power transfer for electronic equipment is so developed, but the ones on the market today only show a very short distance of 0 cm. The study of wireless power by using magnetik koil has much aspect in terms of transistor and mosfet. These factors are the norms and necessary aspect of wireless power transfer by using magnetik koil. From the transistor and mosfet test for wireless power transfer, it shows that the mosfet IRFP450 has the highest efficiency comparing to mosfet IRFZ44N, transistor BC639 and transistor BD139. Result shows efficiency for 0cm distance is obtained by mosfet IRFP450 which is 100% comparing to IRFZ44N which is 100%, BC639 which is 97.08% and BD139 which is 88.08%. Result shows that the highest efficiency for 50cm distance is obtained by mosfet IRFP450 which is 25.41% comparing to IRFZ44N which is 16.4%, BC639 which is 4.75% and BD139 which is 4.08%.
Latent Space Arc Therapy Optimization
Creators: name: Bice, Noah
name: Fakhreddine, Mohamad
name: Li, Ruiqi
name: Nguyen, Dan
name: Kabat, Christopher
name: Myers, Pamela
name: Papanikolaou, Niko
name: Kirby, Neil
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Volumetric modulated arc therapy planning is a challenging problem in high-dimensional, non-convex optimization. Traditionally, heuristics such as fluence-map-optimization-informed segment initialization use locally optimal solutions to begin the search of the full arc therapy plan space from a reasonable starting point. These routines facilitate arc therapy optimization such that clinically satisfactory radiation treatment plans can be created in about 10 minutes. However, current optimization algorithms favor solutions near their initialization point and are slower than necessary due to plan overparameterization. In this work, arc therapy overparameterization is addressed by reducing the effective dimension of treatment plans with unsupervised deep learning. An optimization engine is then built based on low-dimensional arc representations which facilitates faster planning times.
Unified explanation of the Kadowaki-Woods ratio in strongly correlated materials
Creators: name: Jacko, A. C.
name: Fjaerestad, J. O.
name: Powell, B. J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Discoveries of ratios whose values are constant within broad classes of materials have led to many deep physical insights. The Kadowaki-Woods ratio (KWR) compares the temperature dependence of a metal's resistivity to that of its heat capacity; thereby probing the relationship between the electron-electron scattering rate and the renormalisation of the electron mass. However, the KWR takes very different values in different materials. Here we introduce a ratio, closely related to the KWR, that includes the effects of carrier density and spatial dimensionality and takes the same (predicted) value in organic charge transfer salts, transition metal oxides, heavy fermions and transition metals - despite the numerator and denominator varying by ten orders of magnitude. Hence, in these materials, the same emergent physics is responsible for the mass enhancement and the quadratic temperature dependence of the resistivity and no exotic explanations of their KWRs are required.
description: Final version accepted by Nature Phys
Sulle infrastrutture
Creators: name: Forte, Francesco
Publisher: name: Territorio della Ricerca su Insediamenti e Ambiente. Rivista internazionale di cultura urbanistica
Year: 2012

description: Siamo oggi consapevoli della modesta efficacia delle politiche pubbliche infrastrutturali ed urbane nell’incidere sulla mancata modernizzazione delle nostre regioni. Persiste il “dramma di Napoli e della Campania” manifestazione del malessere urbano, non scalfito dall’azione pubblica seppur adeguatamente finanziata. Il sistema illegale si è rafforzato contestualmente alla crisi produttiva, all’affievolirsi della tensione educativa, all’accentuarsi della crisi della scuola e della formazione universitaria, al ripiegarsi della città su se stessa, nel mentre si manipolava la retorica di un presunto “rinascimento”. Se “svegliare lo Stato dal lungo sonno” è l’auspicio indicato da Francesco Paolo Casavola nel marcare le responsabilità della politica (2008), l’urgenza del definire le modalità di questo risveglio si pone anche con riferimento alla questione urbana e delle infrastrutture
description: Territorio della Ricerca su Insediamenti e Ambiente. Rivista internazionale di cultura urbanistica, No 1 (2008): The bridge in space and time to overcome urban barriers
Hipparchos : studies in peisistratid history, 528-514 B.C.
Creators: name: Lavelle, Brian M.
Publisher: name: University of British Columbia
Year: 2010

description: This dissertation examines Hipparchos, the son of Peisistratos, and the years 528-514 B.C. at Athens. Modern scholarship has generally adjudged Hipparchos a powerless, dissolute aesthete on the basis of Thucydides' test- imonia about Hipparchos' murder. Yet, it is clear from other sources that Hipparchos was much more, perhaps even the most important Peisistratid after Peisistratos' death, certainly the most visible. The purpose of this dissertation is to shed new light on this important period by aiming at a better understanding of Hipparchos. Chapter I concerns Hipparchos' image and is a compilation of testimonia relevant to him. The introduction to the chapter attempts to illustrate the importance of image to Greek tyrants of the archaic period and to show that image can be useful as an indicator of tyrannical power. The remainder of the chapter is divided into the archaeological and literary records of Hipparchos. Sections are devoted to Hipparchos' herms, the wall of the Akademy and his Ptolon dedication. The literary record is divided into external affairs (Hipparchos and Ionia), internal/external affairs (the Onomakritos-affair), and internal affairs (the Panathenaia and Hipparchos). The conclusion is that Hipparchos was far more prominent than his brother Hippias and much more significant than previously believed. Chapter II confronts the historiographical problem of succession to Peisistratos. It is divided into examination of the stele concerning the adikia of the tyrants', Thucydides' most important evidence for the successsion, and the literary tradition about the succession. (An appendix examines the evidence of the sixth century archon-list.) The conclusion is that the succession-issue became controversial in the fifth century, apparently well after the end of the tyranny. Chapter III deals with Thucydides' account of Hipparchos' murder. Sections are given to accounts before Thucydides', but later accounts are considered only as they differ from his on specific points. Thucydides1 account is examined in two sections: motivation of the tyrannicides and the act itself. The conclusion is that Thucydides was quite probably influenced by his own preconceptions to read his beliefs into a substructure of earlier material. The evidence for this is inconsistency and implausibility in Thucydides' account. An epilogue considers Hipparchos1 influence over later prominent Athenians and the city itself.
การพัฒนารูปแบบความร่วมมือด้านการวิจัยทางวิทยาศาสตร์และเทคโนโลยีสำหรับสถาบันอุดมศึกษาของรัฐ
Creators: name: เกษสุนีย์ บำรุงจิตต์
Publisher: name: มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร
Year: 2012
Subjects: รูปแบบความร่วมมือด้านการวิจัยทางวิทยาศาสตร์และเทคโนโลยี

description: 1, 6, วารสารวิชาการและวิจัย มทร.พระนคร
Design Considerations for a Ground-based Transit Search for Habitable Planets Orbiting M dwarfs
Creators: name: Nutzman, Philip
name: Charbonneau, David
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: By targeting nearby M dwarfs, a transit search using modest equipment is capable of discovering planets as small as 2 Earth radii in the habitable zones of their host stars. The MEarth Project, a future transit search, aims to employ a network of ground-based robotic telescopes to monitor M dwarfs in the northern hemisphere with sufficient precision and cadence to detect such planets. Here we investigate the design requirements for the MEarth Project. We evaluate the optimal bandpass, and the necessary field of view, telescope aperture, and telescope time allocation on a star-by-star basis, as is possible for the well-characterized nearby M dwarfs. Through these considerations, 1,976 late M dwarfs (R < 0.33 Rsun) emerge as favorable targets for transit monitoring. Based on an observational cadence and on total telescope time allocation tailored to recover 90% of transit signals from planets in habitable zone orbits, we find that a network of ten 30 cm telescopes could survey these 1,976 M dwarfs in less than 3 years. A null result from this survey would set an upper limit (at 99% confidence) of 17% for the rate of occurrence of planets larger than 2 Earth radii in the habitable zones of late M dwarfs, and even stronger constraints for planets lying closer than the habitable zone. If the true occurrence rate of habitable planets is 10%, the expected yield would be 2.6 planets.
description: accepted to PASP
ความสำเร็จของการฝึกอมรบเพื่อพัฒนาและสร้างอาชีพ
Creators: name: ดวงสุดา เตโชติรส
Publisher: name: มหาวิทยาลัยเทคโนโลยีราชมงคลพระนคร
Year: 2012
Subjects: การฝึกอบรม,พัฒนาและสร้างอาชีพ

description: 1, 6, วารสารวิชาการและวิจัย มทร.พระนคร
Kink structure in the electronic dispersion of high-Tc superconductors from the electron-phonon interaction
Creators: name: Koikegami, Shigeru
name: Aiura, Yoshihiro
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We investigate the electronic dispersion of high-Tc superconductor on the basis of the two-dimensional three-band Hubbard model with the electron-phonon interaction together with the strong electron-electron interaction. In our model, it is shown across the hole-doped region of high-Tc superconductor that the electron-phonon interaction makes a dispersion kink, observed along the nodal direction, and that the small isotope effect appears on the electronic dispersion.
description: 15 pages, 8 figures. to be published in Phys. Rev. B 77, No.18 (2008)
The coupling of the X$^{1}Σ^{+}$ and a$^{3}Σ^{+}$ states of KRb
Creators: name: Pashov, A.
name: Docenko, O.
name: Tamanis, M.
name: Ferber, R.
name: Knoeckel, H.
name: Tiemann, E.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: A comprehensive study of the electronic states at the 4s+5s asymptote in KRb is presented. Abundant spectroscopic data on the \astate state were collected by Fourier-transform spectroscopy which allow to determine an accurate experimental potential energy curve up to 14.8 Å. The existing data set (C. Amiot et al. J. Chem. Phys. 112, 7068 (2000)) on the ground state \Xstate was extended by several additional levels lying close to the atomic asymptote. In a coupled channels fitting routine complete molecular potentials for both electronic states were fitted. Along with the line frequencies of the molecular transitions, recently published positions of Feshbach resonances in $^{40}$K and $^{87}$Rb mixtures (F. Ferlaino et al. Phys. Rev. A 74, 039903 (2006)) were included in the fit. This makes the derived potential curves capable for an accurate description of observed cold collision features so far. Predictions of scattering lengths and Feshbach resonances in other isotopic combinations are reported.
description: 14 pages, 5 figures
Freshly Formed Dust in the Cassiopeia A Supernova Remnant as Revealed by the Spitzer Space Telescope
Creators: name: Rho, J.
name: Kozasa, T.
name: Reach, W. T.
name: Rudnick, L.
name: DeLaney, T.
name: Smith, J. D.
name: Ennis, J. A.
name: Gomez, H.
name: Tappe, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We performed Spitzer Infrared Spectrograph mapping observations covering nearly the entire extent of the Cassiopeia A supernova remnant (SNR), producing mid-infrared (5.5-35 micron) spectra every 5-10". Gas lines of Ar, Ne, O, Si, S and Fe, and dust continua were strong for most positions. We identify three distinct ejecta dust populations based on their continuum shapes. The dominant dust continuum shape exhibits a strong peak at 21 micron. A line-free map of 21 micron-peak dust made from the 19-23 micron range closely resembles the [Ar II], [O IV], and [Ne II] ejecta-line maps implying that dust is freshly formed in the ejecta. Spectral fitting implies the presence of SiO2, Mg protosilicates, and FeO grains in these regions. The second dust type exhibits a rising continuum up to 21 micron and then flattens thereafter. This ``weak 21 micron'' dust is likely composed of Al2O3 and C grains. The third dust continuum shape is featureless with a gently rising spectrum and is likely composed of MgSiO3 and either Al2O3 or Fe grains. Using the least massive composition for each of the three dust classes yields a total mass of 0.02 Msun. Using the most-massive composition yields a total mass of 0.054 Msun. The primary uncertainty in the total dust mass stems from the selection of the dust composition necessary for fitting the featureless dust as well as 70 micron flux. The freshly formed dust mass derived from Cas A is sufficient from SNe to explain the lower limit on the dust masses in high redshift galaxies.
description: 8 figures: Accepted for the publication in ApJ
Quasi-Simultaneous Two Band Optical Micro-Variability of Luminous Radio-Quiet QSOs
Creators: name: Gupta, Alok C.
name: Yuan, Weimin
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the first results of quasi-simultaneous two passband optical monitoring of six quasi-stellar objects to search for micro-variability. We carried out photometric monitoring of these sources in an alternating sequence of R and V passbands, for five radio-quiet quasi-stellar objects (RQQSOs), 0748+291, 0824+098, 0832+251, 1101+319, 1225+317 and one radio-loud quasi-stellar object (RLQSO), 1410+429. No micro-variability was detected in any of the RQQSOs, but convincing micro-variability was detected in the RLQSO on two successive nights it was observed. Using the compiled data of optical micro-variability of RQQSOs till date, we got the duty cycle for micro-variability in RQQSOs is $\sim$ 10%. The present investigation indicates that micro-variability is not a persistent property of RQQSOs but an occasional incident.
description: 22 pages, 3 tables, 6 figures; Accepted for publication to New Astronomy
Automating dipole subtraction for QCD NLO calculations
Creators: name: Gleisberg, Tanju
name: Krauss, Frank
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this publication the construction of an automatic algorithm to subtract infrared divergences in real QCD corrections through the Catani-Seymour dipole subtraction method [arXiv:hep-ph/9605323] is reported. The resulting computer code has been implemented in the matrix element generator AMEGIC++ [arXiv:hep-ph/0109036]. This will allow for the automatic generation of dipole subtraction terms and their integrals over the one-parton emission phase space for any given process. If the virtual matrix element is provided as well, this then directly leads to an NLO QCD parton level event generator.
description: 42 pages, 8 figures
Medical Instrument Segmentation in 3D US by Hybrid Constrained Semi-Supervised Learning
Creators: name: Yang, Hongxu
name: Shan, Caifeng
name: Bouwman, R. Arthur
name: Dekker, Lukas R. C.
name: Kolen, Alexander F.
name: de With, Peter H. N.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Medical instrument segmentation in 3D ultrasound is essential for image-guided intervention. However, to train a successful deep neural network for instrument segmentation, a large number of labeled images are required, which is expensive and time-consuming to obtain. In this article, we propose a semi-supervised learning (SSL) framework for instrument segmentation in 3D US, which requires much less annotation effort than the existing methods. To achieve the SSL learning, a Dual-UNet is proposed to segment the instrument. The Dual-UNet leverages unlabeled data using a novel hybrid loss function, consisting of uncertainty and contextual constraints. Specifically, the uncertainty constraints leverage the uncertainty estimation of the predictions of the UNet, and therefore improve the unlabeled information for SSL training. In addition, contextual constraints exploit the contextual information of the training images, which are used as the complementary information for voxel-wise uncertainty estimation. Extensive experiments on multiple ex-vivo and in-vivo datasets show that our proposed method achieves Dice score of about 68.6%-69.1% and the inference time of about 1 sec. per volume. These results are better than the state-of-the-art SSL methods and the inference time is comparable to the supervised approaches.
description: Accepted by IEEE JBHI
Self-Dimensioning and Planning of Small Cell Capacity in Multitenant 5G Networks
Creators: name: Muñoz, Pablo
name: Sallent, Oriol
name: Pérez-Romero, Jordi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: An important concept in the fifth generation of mobile networks is multitenancy, which allows diverse operators sharing the same wireless infrastructure. To support this feature in conjunction with the challenging performance requirements of future networks, more automated and faster planning of the required radio capacity is needed. Likewise, installing small cells is an effective resource to provide greater performance and capacity to both indoor and outdoor places. This paper proposes a new framework for automated cell planning in multitenant small cell networks. In particular, taking advantage of the available network data, a set of detailed planning specifications over time and space domains are generated in order to meet the contracted capacity by each tenant. Then, the network infrastructure and configuration are updated according to an algorithm that considers different actions such as adding/removing channels and adding or relocating small cells. The simulation results show the effectiveness of various methods to derive the planning specifications depending on the correlation between the tenant's and network's traffic demands.
description: arXiv admin note: text overlap with arXiv:2104.14833
Theory for the phase behaviour of a colloidal fluid with competing interactions
Creators: name: Archer, A. J.
name: Ionescu, C.
name: Pini, D.
name: Reatto, L.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the phase behaviour of a fluid composed of particles which interact via a pair potential that is repulsive for large inter-particle distances, is attractive at intermediate distances and is strongly repulsive at short distances (the particles have a hard core). As well as exhibiting gas-liquid phase separation, this system also exhibits phase transitions from the uniform fluid phases to modulated inhomogeneous fluid phases. Starting from a microscopic density functional theory, we develop an order parameter theory for the phase transition in order to examine in detail the phase behaviour. The amplitude of the density modulations is the order parameter in our theory. The theory predicts that the phase transition from the uniform to the modulated fluid phase can be either first order or second order (continuous). The phase diagram exhibits two tricritical points, joined to one another by the line of second order transitions.
description: 12 pages, 9 figures. Accepted for publication in J. Phys. Condens. Matter
Ethics-Based Auditing to Develop Trustworthy AI
Creators: name: Mokander, Jakob
name: Floridi, Luciano
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computers and Society (cs.CY)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: A series of recent developments points towards auditing as a promising mechanism to bridge the gap between principles and practice in AI ethics. Building on ongoing discussions concerning ethics-based auditing, we offer three contributions. First, we argue that ethics-based auditing can improve the quality of decision making, increase user satisfaction, unlock growth potential, enable law-making, and relieve human suffering. Second, we highlight current best practices to support the design and implementation of ethics-based auditing: To be feasible and effective, ethics-based auditing should take the form of a continuous and constructive process, approach ethical alignment from a system perspective, and be aligned with public policies and incentives for ethically desirable behaviour. Third, we identify and discuss the constraints associated with ethics-based auditing. Only by understanding and accounting for these constraints can ethics-based auditing facilitate ethical alignment of AI, while enabling society to reap the full economic and social benefits of automation.
description: Minds & Machines (2021)
Flat Universe with Hyperbolic Voids
Creators: name: Gurzadyan, V. G.
name: Kocharyan, A. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The properties of geodesics flow are studied in a Friedmann-Robertson-Walker metric perturbed due to the inhomogeneities of matter. The basic, averaged Jacobi equation is derived, which reveals that the low density regions (voids) are able to induce hyperbolicity, even if the global curvature of the Universe is zero or slightly positive. It is shown that the energy independence is a characteristic property of these geometric effects. The importance of these conclusions is determined by the temperature independent ellipticity of excursion sets and regions of different randomness found in Kolmogorov CMB maps.
description: Europhys.Lett., in press
Impact of Climate Change on the Power Grid (slides)
Creators: K. Seile
R. Tabors
M. O'Malley
B. Kroposki
C. Arends
D. Diaz
A. Silverstein
J. Sharp
A. Olson
Publisher: name: IEEE
Year: 2021

This super session is comprised of the folllowing presentations: Decarbonization and the Grid of the Future, Marginal Emission Rates: The needed metric of carbon displacement in an increasingly electrified world, Research needs for grid to adapt t and mitigate climate change, Integrating Massive amounts of Variable Renewable Energy into Power Grids, How Utility Companies Manage Wildfire Risk, Integrating Climate Impacts and Resiliency Research for the Electric Power System, Climate Change, Reliability and Energy Efficiency, Climate Change, Extreme Weather and the Evolving Grid: Separating Facts, Myths and Speculation, Scalable Markets for the Energy Transition: A Blueprint for Wholesale Electricity Market Reform
This super session is comprised of the folllowing presentations: Decarbonization and the Grid of the Future, Marginal Emission Rates: The needed metric of carbon displacement in an increasingly electrified world, Research needs for grid to adapt t and mitigate climate change, Integrating Massive amounts of Variable Renewable Energy into Power Grids, How Utility Companies Manage Wildfire Risk, Integrating Climate Impacts and Resiliency Research for the Electric Power System, Climate Change, Reliability and Energy Efficiency, Climate Change, Extreme Weather and the Evolving Grid: Separating Facts, Myths and Speculation, Scalable Markets for the Energy Transition: A Blueprint for Wholesale Electricity Market Reform
IEEE Standard 1547: Distributed Energy Resource Requirements and Implementation to Interconnection Processes (Slides)
Creators: David Narang – Principal Engineering at NREL
Chair of IEEE 1547 WG
Ravi Subramaniam – IEEE SA
Director
Publisher: name: IEEE
Year: 2021

This presentation will introduce key concepts and functionality required for IEEE Std 1547-2018 compliant distributed energy resources (DERs). The presentation will include discussion of overall DER capabilities and grid support functions under normal and abnormal grid conditions. Additional material will present considerations for adopting the standard into local jurisdictions.
Group Representations and High-Resolution Central Limit Theorems for Subordinated Spherical Random Fields
Creators: name: Marinucci, Domenico
name: Peccati, Giovanni
Publisher: name: arXiv
Year: 2007
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60B15, 60F05, 60G60

description: We study the weak convergence (in the high-frequency limit) of the frequency components associated with Gaussian-subordinated, spherical and isotropic random fields. In particular, we provide conditions for asymptotic Gaussianity and we establish a new connection with random walks on the the dual of SO(3), which mirrors analogous results previously established for fields defined on Abelian groups (see Marinucci and Peccati (2007)). Our work is motivated by applications to cosmological data analysis, and specifically by the probabilistic modelling and the statistical analysis of the Cosmic Microwave Background radiation, which is currently at the frontier of physical research. To obtain our main results, we prove several fine estimates involving convolutions of the so-called Clebsch-Gordan coefficients (which are elements of unitary matrices connecting reducible representations of SO(3)); this allows to intepret most of our asymptotic conditions in terms of coupling of angular momenta in a quantum mechanical system. Part of the proofs are based on recently established criteria for the weak convergence of multiple Wiener-Itô integrals.
description: Revised Version
Behind the Meter - Distributed Load Control Strategies: September 2021 issue of IEEE Electrification Magazine (Slides)
Creators: Lingling Fan
Publisher: name: IEEE
Year: 2021

Traditionally, behind-the-meter loads are not for active control. With more and more behind-the-meter electric vehicles, distributed energy resources such as solar, wind, and batteries, load control may create economic and reliability benefits. This topic of load control is addressed by the September 2021 issue “behind the meter – distributed load control strategies, ” edited by Prof. Mohammad Shahildepour. In this webinar, three papers from this issue will be presented.

1. Behind the meter strategies Energy Management System with a Swedish case study. Speakers: Lina Bertling Tjernberg and Hamza Shafique
2. Energy Storage: Improving System Reliability, Deferring Network Upgrading, Taking Advantage of Markets and Beyond. Speakers: Xuan Wu, Antonio Conejo
3. Mining Smart Meter Data to Enhance Distribution Grid Observability for Behind-the-Meter Load Control. Speakers: Yuxuan Yuan and Zhaoyu Wang

The authors will examine behind the meter load control from various point of views, including real-world EMS design for peak shaving and frequency regulation using loads, how to plan battery energy storage for reliability improvement, and load control via smart meter data mining.
Traditionally, behind-the-meter loads are not for active control. With more and more behind-the-meter electric vehicles, distributed energy resources such as solar, wind, and batteries, load control may create economic and reliability benefits. This topic of load control is addressed by the September 2021 issue “behind the meter – distributed load control strategies, ” edited by Prof. Mohammad Shahildepour. In this webinar, three papers from this issue will be presented.

1. Behind the meter strategies Energy Management System with a Swedish case study. Speakers: Lina Bertling Tjernberg and Hamza Shafique
2. Energy Storage: Improving System Reliability, Deferring Network Upgrading, Taking Advantage of Markets and Beyond. Speakers: Xuan Wu, Antonio Conejo
3. Mining Smart Meter Data to Enhance Distribution Grid Observability for Behind-the-Meter Load Control. Speakers: Yuxuan Yuan and Zhaoyu Wang

The authors will examine behind the meter load control from various point of views, including real-world EMS design for peak shaving and frequency regulation using loads, how to plan battery energy storage for reliability improvement, and load control via smart meter data mining.
Coexistence of superconductivity and charge-density waves in a two-dimensional Holstein model at half-filling
Creators: name: Sykora, S.
name: Hübsch, A.
name: Becker, K. W.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: In one dimension the coupling of electrons to phonons leads to a transition from a metallic to a Peierls distorted insulated state if the coupling exceeds a critical value. On the other hand, in two dimensions the electron-phonon interaction may also lead to the formation of Cooper pairs. This competition of superconductivity and charge order (in conjunction with a lattice distortion) is studied in this letter by means of the projector-based renormalization method (PRM). Increasing the electron-phonon interaction, we find a crossover behavior between a purely superconducting state and a charge-density wave where a well-defined parameter range of coexistence of superconductivity and lattice distortion exists.
description: 11 pages, 2 figures
The Kähler-Ricci flow with positive bisectional curvature
Creators: name: Phong, D. H.
name: Song, Jian
name: Sturm, Jacob
name: Weinkove, Ben
Publisher: name: arXiv
Year: 2007
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics

description: We show that the Kähler-Ricci flow on a manifold with positive first Chern class converges to a Kähler-Einstein metric assuming positive bisectional curvature and certain stability conditions.
description: 15 pages
Ultra-Short-Period Massive Black Hole Binary Candidates in LSST as LISA "Verification Binaries"
Creators: name: Xin, Chengcheng
name: Haiman, Zoltan
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The Legacy Survey of Space and Time (LSST) by the Vera C. Rubin Observatory is expected to discover tens of millions of quasars. A significant fraction of these could be powered by coalescing massive black hole (MBH) binaries, since many quasars are believed to be triggered by mergers. We show that under plausible assumptions about the luminosity functions, lifetimes, and binary fractions of quasars, we expect the full LSST quasar catalogue to contain between 20-100 million compact MBH binaries with masses $M=10^{5-9}M_{\odot}$, redshifts $z=0-6$, and orbital periods $P=1-70$ days. Their light-curves are expected to be distinctly periodic, which can be confidently distinguished from stochastic red-noise variability, because LSST will cover dozens, or even hundreds of cycles. A very small subset of 10-150 ultra-compact ($P\lesssim1$ day) binary quasars among these will, over $\sim$5-15 years, evolve into the mHz gravitational-wave (GW) frequency band and can be detected by $\textit{LISA}$. They can therefore be regarded as "$\textit{LISA}$ verification binaries", analogous to short-period Galactic compact-object binaries. The practical question is how to find these handful of "needles in the haystack" among the large number of quasars: this will likely require a tailored co-adding analysis optimised for this purpose.
Interfaces, modulated phases and textures in lattice systems
Creators: name: Braides, Andrea
name: Cicalese, Marco
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We introduce a class of $n$-dimensional (possibly inhomogeneous) spin-like lattice systems presenting modulated phases with possibly different textures. Such systems can be parameterized according to the number of ground states, and can be described by a phase-transition energy which we compute by means of variational techniques. Degeneracies due to frustration are also discussed.