cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Graph Infomax Adversarial Learning for Treatment Effect Estimation with Networked Observational Data
Creators: name: Chu, Zhixuan
name: Rathbun, Stephen L.
name: Li, Sheng
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences
subject: H.0; I.0; I.2
subject: 68U01

description: Treatment effect estimation from observational data is a critical research topic across many domains. The foremost challenge in treatment effect estimation is how to capture hidden confounders. Recently, the growing availability of networked observational data offers a new opportunity to deal with the issue of hidden confounders. Unlike networked data in traditional graph learning tasks, such as node classification and link detection, the networked data under the causal inference problem has its particularity, i.e., imbalanced network structure. In this paper, we propose a Graph Infomax Adversarial Learning (GIAL) model for treatment effect estimation, which makes full use of the network structure to capture more information by recognizing the imbalance in network structure. We evaluate the performance of our GIAL model on two benchmark datasets, and the results demonstrate superiority over the state-of-the-art methods.
description: Proceedings of the 27th ACM SIGKDD Conference on Knowledge Discovery and Data Mining (KDD '21), August 14--18, 2021, Virtual Event, Singapore
Increased Need for Probabilistic System Operation and Planning in the 21 Century
Creators: N. Abdel
J. Jin
M. Perben
L. Wehenkel
Publisher: name: IEEE
Year: 2018

2018 PES GM Panel Presentation
The Bulk Power System (BPS) is undergoing significant change that is unprecedented for both its transformational nature and rapid pace.  Such extraordinary change presents new challenges and opportunities for reliability.  Dramatic advances in technology, customer preferences, public policy, and market forces are altering the generation resource mix and challenging the conventional understanding of baseload power, traditionally provided by large generating units with low maintenance and forced outage rates.  Careful operation, planning, and support become crucial to remain the BPS reliable and resilient.  Topics covered by this panel will include efforts both newly developed and under development towards consistent ways of making decisions under uncertainty to support grid development, operation management, and planning.  Panelists will cover new probabilistic methods and tools in the 21-century due increased uncertainties both on the demand and on the supply side.
The Economics of Local Food Systems: A Toolkit to Guide Community Discussions, Assessments and Choices
Creators: name: McFadden, Dawn Thilmany
name: Et Al.:  +12
name: McFadden, Dawn Thilmany
name: Et Al.:  +12
Publisher: name: Unknown
Year: 2017
Subjects: subject: Community/Rural/Urban Development
subject: Marketing
subject: FOS: Economics and business
subject: Research and Development/Tech Change/Emerging Technologies
subject: Research Methods/ Statistical Methods

description: Excerpts from the report: The goal of this Toolkit is to guide and enhance the capacity of local organizations to make more deliberate and credible measurements of local and regional economic activity and other ancillary benefits. The Toolkit is made up of seven modules that can be grouped into two stages of food system planning, assessment, and evaluation. The first set of modules (1-4) guides the preliminary stages of an impact assessment and includes framing the system, relevant economic activities and assessment process as well as collecting and analyzing relevant primary and secondary data. For those seeking a more robust economic impact assessment, the second set of modules (5-7) provides a more technical set of practices and discussion of how to use the information collected in stage one to conduct a more rigorous analysis.
Hamiltonian submanifolds of regular polytopes
Creators: name: Effenberger, Felix
name: Kühnel, Wolfgang
Publisher: name: arXiv
Year: 2008
Subjects: subject: Geometric Topology (math.GT)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 52B70, 05C45, 52-04, 53C42, 57Q35

description: We investigate polyhedral $2k$-manifolds as subcomplexes of the boundary complex of a regular polytope. We call such a subcomplex {\it $k$-Hamiltonian} if it contains the full $k$-skeleton of the polytope. Since the case of the cube is well known and since the case of a simplex was also previously studied (these are so-called {\it super-neighborly triangulations}) we focus on the case of the cross polytope and the sporadic regular 4-polytopes. By our results the existence of 1-Hamiltonian surfaces is now decided for all regular polytopes. Furthermore we investigate 2-Hamiltonian 4-manifolds in the $d$-dimensional cross polytope. These are the "regular cases" satisfying equality in Sparla's inequality. In particular, we present a new example with 16 vertices which is highly symmetric with an automorphism group of order 128. Topologically it is homeomorphic to a connected sum of 7 copies of $S^2 \times S^2$. By this example all regular cases of $n$ vertices with $n < 20$ or, equivalently, all cases of regular $d$-polytopes with $d\leq 9$ are now decided.
description: 26 pages, 4 figures
Integrality of the LMOV invariants for framed unknot
Creators: name: Luo, Wei
name: Zhu, Shengmao
Publisher: name: arXiv
Year: 2021
Subjects: subject: Geometric Topology (math.GT)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: The Labastida-Marinõ-Ooguri-Vafa (LMOV) invariants are the open string BPS invariants which are expected to be integers based on the string duality conjecture from M-theory. Several explicit formulae of LMOV invariants for framed unknot have been obtained in the literature. In this paper, we present a unified method to deal with the integrality of such explicit formulae. Furthermore, we also prove the integrality of certain LMOV invariants for framed unknot in higher genera.
description: This is the published version for Section 4 of our article arXiv:1611.06506
2020 PES GM Tutorial Series: Cybersecurity of the Electric Power Transmission and Distribution System, Session 2: Cybersecurity implementation examples and Utility perspective on the cyber security (Slides)
Creators: Dr. Murty V.V.S. Yalla
Dr. Nathan Wallace
Publisher: name: IEEE
Year: 2020

These tutorial slides will show cybersecurity basics including passwords & access management, authentication, encryption, network security monitoring, techniques in cyber alarming, logging, and auditing. The tutorial also covers NERC CIP requirements applicable to T&D systems along with brief overview of IEEE and IEC standards. Cybersecurity implementation examples of substation protection, automation and controls systems including devices inside as well as outside the substations are also discussed. Utility perspective on Cybersecurity and NERC CIP compliance will be included.
These tutorial slides will show cybersecurity basics including passwords & access management, authentication, encryption, network security monitoring, techniques in cyber alarming, logging, and auditing. The tutorial also covers NERC CIP requirements applicable to T&D systems along with brief overview of IEEE and IEC standards. Cybersecurity implementation examples of substation protection, automation and controls systems including devices inside as well as outside the substations are also discussed. Utility perspective on Cybersecurity and NERC CIP compliance will be included.
Cuban intervention in Angola and Ethiopia, 1975-1980 : the question of Soviet influence on Cuba
Creators: name: Rochlin, James Francis
Publisher: name: University of British Columbia
Year: 2010

description: Cuba's role in Africa in the 1970s has been the subject of numerous and diverse interpretations. Students of Cuban politics sometimes tend to take a general view of Cuban policy toward Angola, and so important differences between each issue or situation are overlooked. This study offers separate accounts of the role of Cuba in Africa and in Ethiopia since 1975, with the purpose of exploring the possibility of an influence relationship between Moscow and Havana. Influence analysis is an extremely subjective task. That is, it appears to be virtually impossible to document Soviet influence on Cuba. Nevertheless, it remains possible to examine available evidence with respect to each situation, and then to construct what appears to be the most coherent argument regarding the possibility of Soviet influence on Cuba. I shall conclude that the body of evidence suggests that Cuba did not intervene in Angola chiefly to conform to Soviet preferences or interests. In this sense then, Cuba probably was not influenced by the Soviets to any great degree with respect to the Angolan episode. In contrast, Cuba's role in each of the two Ethiopian incidents seems to exemplify the rather strong possibility of Soviet influence on Cuba. Further, it appears probable that the Soviets influenced Cuba through diplomatic persuasion with regard to the two Ethiopian incidents.
Finding the Sources of Sustained Oscillations – From Theory to Industry Practice
Creators: K. Sun
L. Chen
L. Dosiek
D. Trudnowski
R. Quint
Publisher: name: IEEE
Year: 2018

2018 PES GM Panel Presentation
In recent years, large-magnitude sustained oscillations have been observed in power grids around the world thanks to the availability of PMU data. Some of these oscillations do not appear in any analyses resulting from the dynamic models of power systems. Such oscillations can be due to some dynamics that have not been modeled or an external excitation with a periodic nature. Since the oscillations are not represented in the power system models, they cannot be analytically investigated for the purpose of designing mitigating measures. Therefore, finding the originating sources is crucial either for identifying components that need to be included in the power system model or for mitigating the oscillations and ensuring secure grid operations. This panel discussion consists of two parts. First part is the Oscillation Source Location Task Force report. We will start with real-life examples, and then the theories behind the phenomena; analyzing tools will also be served. In the second part, we will hear from invited speakers from industry to talk about latest industry practices and actions taken in real-time operations.
Solution-processed two-dimensional materials for next-generation photovoltaics
Creators: name: Bellani, Sebastiano
name: Bartolotta, Antonio
name: Agresti, Antonio
name: Calogero, Giuseppe
name: Grancini, Giulia
name: Di Carlo, Aldo
name: Bonaccorso, Francesco
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: In the ever-increasing energy demand scenario, the development of novel photovoltaic (PV) technologies is considered to be one of the key solutions to fulfil the energy request. In this context, graphene and related two-dimensional (2D) materials (GRMs), including nonlayered 2D materials and 2D perovskites, as well as their hybrid systems, are emerging as promising candidates to drive innovation in PV technologies. The mechanical, thermal, and optoelectronic properties of GRMs can be exploited in different active components of solar cells to design next-generation devices. These components include front (transparent) and back conductive electrodes, charge transporting layers, and interconnecting-recombination layers, as well as photoactive layers. The production and processing of GRMs in the liquid phase, coupled with the ability to on-demand tune their optoelectronic properties exploiting wet-chemical functionalization, enable their effective integration in advanced PV devices through scalable, reliable, and inexpensive printing-coating processes. Herein, we review the progresses in the use of solution-processed 2D materials in organic solar cells, dye-sensitized solar cells, perovskite solar cells, quantum dot solar cells, and organic-inorganic hybrid solar cells, as well as in tandem systems. We first provide a brief introduction on the properties of 2D materials and their production methods by solution-processing routes. Then, we discuss the functionality of 2D materials for electrodes, photoactive layer components-additives, charge transporting layers, and interconnecting layers through figures of merit, which allow the performance of solar cells to be determined and compared with the state-of-the-art values. We finally outline the roadmap for the further exploitation of solution-processed 2D materials to boost the performance of PV devices.
description: Chemical Society Reviews, 2021, Advance Article
Semileptonic hyperon decays in the self-consistent SU(3) chiral quark-soliton model
Creators: name: Ledwig, Tim
name: Silva, Antonio
name: Kim, Hyun-Chul
name: Goeke, Klaus
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate the semileptonic hyperon decays within the framework of the self-consistent SU(3) chiral quark-soliton model ($χ$QSM). We take linear $1/N_c$ rotational as well as linear $m_s$ corrections into account and apply the symmetry conserving quantization. We present the results for the form factors $f_1(Q^2)$, $f_2(Q^2)$ and $g_1(Q^2)$ in addition to the semileptonic decay constants of hyperons. We also have calculated the radii and dipole masses of these form factors for all relevant strangeness-conserving and strangeness-changing transitions.
description: 29 pages, 6 figures
Community Supported Agriculture: New Models for Changing Markets
Creators: name: Woods, Timothy
name: Ernst, Matthew
name: Tropp, Debra
name: Woods, Timothy
name: Ernst, Matthew
name: Tropp, Debra
Publisher: name: Unknown
Year: 2017
Subjects: subject: Marketing
subject: FOS: Economics and business
subject: Research and Development/Tech Change/Emerging Technologies
subject: Research Methods/ Statistical Methods

description: Excerpts from the report Introduction: This study proposed to identify the trends in CSA business model adaptation including changes in product innovation and profitability drivers as the CSA marketing model evolves to address emerging consumer preferences and direct marketing opportunities. By conducting a national survey of CSAs, researchers hoped to: 1. Describe the current use of the CSA business model, including scale and regional differences; 2. Identify the role and strategic dynamics of the CSA model in a local foods business start-up; 3. Identify the emerging and adapted uses of the CSA model to pursue scale individually and through cooperation and pursue alternative local foods markets; and 4. Examine perspectives of CSA operators on expected future business and market innovations.
description: This work was funded by Cooperative agreement 12-25-A-5660 with the Agricultural Marketing Service of the U.S. Department of Agriculture. This study necessarily involved extensive interviews with numerous Community Supported Agriculture (CSA) operators and builds on the previous case study of selected CSAs published as The Changing CSA Strategic Business Model.
DISKRIT MATEMATIKA VA MATEMATIK MANTIQ TARIXI VA UNING ASOSLARI. TARIXIY MA'LUMOTLAR
Creators: name: Zaxiriddinova, Shaxlo
name: Mamadaliyeva, Mashxura
Publisher: name: Zenodo
Year: 2025

description: Ushbu maqolada diskret matematika va matematik mantiqning tarixi hamda asosiy tamoyillari yoritiladi. Diskret matematika zamonaviy axborot texnologiyalari va algoritmik jarayonlarning nazariy asosi bo‘lib, uning rivojlanishi qadimgi matematika, mantiq va sonlar nazariyasi bilan chambarchas bog‘liqdir. Maqolada Aristotel, Evklid, Jorj Bul kabi olimlarning matematik mantiq va diskret tuzilmalarga qo‘shgan hissasi tahlil qilinadi. Shuningdek, diskret matematikaning asosiy tushunchalari – to‘plamlar nazariyasi, kombinatorika, algoritmlar, graf nazariyasi va mantiqiy hisoblash usullari ko‘rib chiqiladi. Ushbu fan sohasining rivojlanishi zamonaviy dasturlash, kriptografiya, sunʼiy intellekt va kompyuter fanlarining rivojiga qanday ta’sir qilgani ham muhokama qilinadi. Maqola diskret matematikaning nazariy asoslarini va uning amaliy ahamiyatini yoritishga qaratilgan.
Fine-grained state counting for black holes in loop quantum gravity
Creators: name: Ghosh, A.
name: Mitra, P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A state of a black hole in loop quantum gravity is given by a distribution of spins on punctures on the horizon. The distribution is of the Boltzmann type, with the area playing the role of the energy. In investigations where the total area was kept approximately constant, there was a kind of thermal equilibrium between the spins which have the same analogue temperature and the entropy was proportional to the area. If the area is precisely fixed, however, multiple constraints appear, different spins have different analogue temperatures and the entropy is not strictly linear in the area, but is bounded by a linear rise.
description: 5 pages, REVTeX; to appear in PRL
Morphology and flexibility of graphene and few-layer graphene on various substrates
Creators: name: Stöberl, U.
name: Wurstbauer, U.
name: Wegscheider, W.
name: Weiss, D.
name: Eroms, J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report on detailed microscopy studies of graphene and few-layer-graphene produced by mechanical exfoliation on various semi-conducting substrates. We demonstrate the possibility to prepare and analyze graphene on (001)-GaAs, manganese p-doped (001)-GaAs and InGaAs substrates. The morphology of graphene on these substrates was investigated by scanning electron and atomic force microscopy and compared to layers on silicon oxide. It was found that graphene sheets strongly follow the texture of the sustaining substrates independent on doping, polarity or roughness. Furthermore resist residues exist on top of graphene after a lithographic step. The obtained results provide the opportunity to research the graphene-substrate interactions.
title: Front Matter, Table of Contents, Preface, Conference Organization
Creators: name: Lutz, Carsten
name: Jung, Jean Christoph
Publisher: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Year: 2020
Subjects: subject: Front Matter
subject: Table of Contents
subject: Preface
subject: Conference Organization
subject: Information systems → Data management systems
subject: Information systems → Database design and models
subject: Information systems → Database query processing
subject: Information systems → Query languages
subject: Information systems → Relational database model
subject: Information systems → Parallel and distributed DBMSs
subject: Information systems → Information integration
subject: Information systems → Stream management
subject: Theory of computation → Incomplete, inconsistent, and uncertain databases
subject: Theory of computation → Complexity theory and logic
subject: Theory of computation → Database theory

description: Front Matter, Table of Contents, Preface, Conference Organization
description: LIPIcs, Vol. 155, 23rd International Conference on Database Theory (ICDT 2020), pages 0:i-0:xvi
Wideband Channel Estimation for IRS-Aided Systems in the Face of Beam Squint
Creators: name: Ma, Siqi
name: Shen, Wenqian
name: An, Jianping
name: Hanzo, Lajos
Publisher: name: arXiv
Year: 2021
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Intelligent reflecting surfaces (IRSs) improve both the bandwidth and energy efficiency of wideband communication systems by using low-cost passive elements for reflecting the impinging signals with adjustable phase shifts. To realize the full potential of IRS-aided systems, having accurate channel state information (CSI) is indispensable, but it is challenging to acquire, since these passive devices cannot carry out transmit/receive signal processing. The existing channel estimation methods conceived for wideband IRS-aided communication systems only consider the channel's frequency selectivity, but ignore the effect of beam squint, despite its severe performance degradation. Hence we fill this gap and conceive wideband channel estimation for IRS-aided communication systems by explicitly taking the effect of beam squint into consideration. We demonstrate that the mutual correlation function between the spatial steering vectors and the cascaded two-hop channel reflected by the IRS has two peaks, which leads to a pair of estimated angles for a single propagation path, due to the effect of beam squint. One of these two estimated angles is the frequency-independent `actual angle', while the other one is the frequency-dependent `false angle'. To reduce the influence of false angles on channel estimation, we propose a twin-stage orthogonal matching pursuit (TS-OMP) algorithm.
Power and Energy Magazine - Volumen 18: Número 5 - Septiembre / Octubre de 2020: Mira hacia el futuro
Creators: Satish Kumar Sharma
Tom Tellefsen
Daniel Flores
Peter J. Donalek
Kevin Schönleber
Juan Ignacio Guerrero
Publisher: name: IEEE
Year: 2020

El tema de este número es el pasado, presente y futuro de la energía hidroeléctrica.
El tema de este número es el pasado, presente y futuro de la energía hidroeléctrica.
Deep 610-MHz Giant Metrewave Radio Telescope observations of the Spitzer extragalactic First Look Survey field - III. The radio properties of Infrared-Faint Radio Sources
Creators: name: Garn, Timothy
name: Alexander, Paul
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Infrared-Faint Radio Sources (IFRSs) are a class of source which are bright at radio frequencies, but do not appear in deep infrared images. We report the detection of 14 IFRSs within the Spitzer extragalactic First Look Survey field, eight of which are detected near to the limiting magnitude of a deep R-band image of the region, at R ~ 24.5. Sensitive Spitzer Space Telescope images are stacked in order to place upper limits on their mid-infrared flux densities, and using recent 610-MHz and 1.4-GHz observations we find that they have spectral indices which vary between alpha = 0.05 and 1.38, where we define alpha such that S = S_0 nu^(- alpha), and should not be thought of as a single source population. We place constraints on the luminosity and linear size of these sources, and through comparison with well-studied local objects in the 3CRR catalogue demonstrate that they can be modelled as being compact (< 20 kpc) Fanaroff-Riley Class II (FRII) radio galaxies located at high redshift (z > 4).
description: Accepted for publication in MNRAS. 9 pages, 9 figures, 1 Table
Recent Violent System Upsets and Lessons Learned - Part I
Creators: A. Groom
R. Walling
R. Quint
Publisher: name: IEEE
Year: 2018

2018 PES GM Panel Presentation
The response of inverter-based wind and solar generation to recent system disturbances around the world has included unexpected and occasionally severe disruption of supply. Reliability concerns have been raised due to protection and control functions that have resulted in inverter-based generation tripping or ride-through in momentary cessation (aka "blocking") in response to single and multiple grid faults.
Generalised transport equation of the Autocovariance Function of the density field and mass invariant in star-forming clouds
Creators: name: Jaupart, Etienne
name: Chabrier, Gilles
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: In this Letter, we study the evolution of the autocovariance function (ACF) of density field fluctuations in star-forming clouds and thus of the correlation length $l_c(ρ)$ of these fluctuations, which can be identified as the average size of the most correlated structures within the cloud. Generalizing the transport equation derived by Chandrasekhar (1951) for static, homogeneous turbulence, we show that the mass contained within these structures is an invariant, i.e. that the average mass contained in the most correlated structures remains constant during the evolution of the cloud, whatever dominates the global dynamics (gravity or turbulence). We show that the growing impact of gravity on the turbulent flow yields an increase of the variance of the density fluctuations and thus a drastic decrease of the correlation length. Theoretical relations are successfully compared to numerical simulations. This picture brings a robust support to star formation paradigms where the mass concentration in turbulent star-forming clouds evolves from initially large, weakly correlated filamentary structures to smaller, denser more correlated ones, and eventually to small, tightly correlated prestellar cores. We stress that the present results rely on a pure statistical approach of density fluctuations and do not involve any specific condition for the formation of prestellar cores. Interestingly enough, we show that, under average conditions typical of Milky Way molecular clouds, this invariant average mass is about a solar mass, providing an appealing explanation for the apparent universality of the IMF under such environments.
description: Accepted for publications in APJ Letters
A new analysis of PP --> bblvjj at the LHC: Higgs and W boson associated production with two tag jets
Creators: name: Ballestrero, Alessandro
name: Bevilacqua, Giuseppe
name: Maina, Ezio
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Higgs production in association with a $W$ boson and two energetic tag jets at the LHC is studied for $M_H = 120$ \GeV, with the Higgs decaying to $b\bar{b}$ and the $W$ to $\ellν$ ($\ell = e, μ$), guaranteeing high trigger efficiency. All parton level backgrounds are analyzed, including the effect of fake $b$--tagging. We discuss two detection strategies: in the first, more traditional, one, two jets are required to be $b$--tagged while in the second, which has not been previously examined in detail, only one tag is required. After all selection cuts about 80 and 200 events are foreseen in the two cases for a standard luminosity of 100 $fb^{-1}$ with a S/B ratio of 1/25 and 1/60 respectively. The corresponding statistical significancies, S/$\sqrt{\mathrm B}$ are 1.81 and 1.82.
description: Version accepted for publication in JHEP. Improved analysis of double b-tagging case. Brief discussion of prospects at the SLHC added
Three fermions with six single particle states can be entangled in two inequivalent ways
Creators: name: Lévay, Péter
name: Vrana, Péter
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Using a generalization of Cayley's hyperdeterminant as a new measure of tripartite fermionic entanglement we obtain the SLOCC classification of three-fermion systems with six single particle states. A special subclass of such three-fermion systems is shown to have the same properties as the well-known three-qubit ones. Our results can be presented in a unified way using Freudenthal triple systems based on cubic Jordan algebras. For systems with an arbitrary number of fermions and single particle states we propose the Plücker relations as a sufficient and necessary condition of separability.
description: 23 pages LATEX
A problem in one-dimensional diffusion-limited aggregation (DLA) and positive recurrence of Markov chains
Creators: name: Kesten, Harry
name: Sidoravicius, Vladas
Publisher: name: arXiv
Year: 2008
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60K35 (Primary) 60J15, 82C41 (Secondary)

description: We consider the following problem in one-dimensional diffusion-limited aggregation (DLA). At time $t$, we have an "aggregate" consisting of $\Bbb{Z}\cap[0,R(t)]$ [with $R(t)$ a positive integer]. We also have $N(i,t)$ particles at $i$, $i>R(t)$. All these particles perform independent continuous-time symmetric simple random walks until the first time $t'>t$ at which some particle tries to jump from $R(t)+1$ to $R(t)$. The aggregate is then increased to the integers in $[0,R(t')]=[0,R(t)+1]$ [so that $R(t')=R(t)+1$] and all particles which were at $R(t)+1$ at time $t'{-}$ are removed from the system. The problem is to determine how fast $R(t)$ grows as a function of $t$ if we start at time 0 with $R(0)=0$ and the $N(i,0)$ i.i.d. Poisson variables with mean $μ>0$. It is shown that if $μ<1$, then $R(t)$ is of order $\sqrt{t}$, in a sense which is made precise. It is conjectured that $R(t)$ will grow linearly in $t$ if $μ$ is large enough.
description: Published in at http://dx.doi.org/10.1214/07-AOP379 the Annals of Probability (http://www.imstat.org/aop/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Miscellaneous 4/19 Panel Sessions
Creators: Z. Wang
K. Schneider
K. Bowes
T. Novy
Publisher: name: IEEE
Year: 2018

2018 PES T&D Panel Presentation
This product contains presentations from 3 different panel sessions presented on Thursday, April 19th. These sessions are entitled: "Building a More Resilient Distribution System Against Extreme Events", "Evaluation of Advanced Distribution System Applications using DMS Centric Approaches", and "Siting New Transmission in 2018".
Characterisation and Testing of DC CBs for Future DC Grids
Creators: D. Jovcic
C. Plet
T. Modeer
M. Popov
L. Yao
J. Josefsson
Publisher: name: IEEE
Year: 2018

2018 PES GM Panel Presentation
DC Transmission grids are intensively studied in multiple applications in Europe and China.  DC Circuit Breakers are considered as key enabling technology which will facilitate rapid isolation of faulted lines and components.  Several DC CB technologies have been brought to prototype stages and are becom-ing commercially available for DC grid applications.  Many but not all technologies utilize high-voltage valves in order to achieve requirements for operating speed.
This panel will present latest research and developments on modelling and testing of DC CBs.  The panel includes several DC CB manufacturers, Research centres and also independent testing centre.  Some full-scale DC CB testing has been ongoing at DNV-GL laboratory and the panellists will report on latest results and developments.  The DC CB test circuit is a completely new and challenging topic which will also be addressed.  Many but not all presenters participate in the EU-funded Promotion project.
Stability of two-dimensional complex plasma monolayers in asymmetric capacitively-coupled radio-frequency discharges
Creators: name: Couëdel, Lénaïc
name: Nosenko, V
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: In this article, the stability of a complex plasma monolayer levitating in the sheath of the poweredelectrode of an asymmetric capacitively coupled radio-frequency argon discharge is studied. Com-pared to earlier studies, a better integration of the experimental results and theory is achieved byoperating with actual experimental control parameters such as the gas pressure and the dischargepower. It is shown that for a given microparticle monolayer at a fixed discharge power there existtwo threshold pressures: (i) above a specific pressure p cryst , the monolayer always crystallises; (ii)below a specific pressure p MCI , the crystalline monolayer undergoes the mode-coupling instability andthe two-dimensional complex plasma crystal melts. In-between p MCI and p cryst , the microparticlemonolayer can be either in the fluid phase or the crystal phase: when increasing the pressure frombelow p MCI , the monolayer remains in the fluid phase until it reaches p cryst at which it recrystallises;when decreasing the pressure from above p cryst , the monolayer remains in the crystalline phase untilit reaches p MCI at which the mode-coupling instability is triggered and the crystal melts. A simpleself-consistent sheath model is used to calculate the rf sheath profile, the microparticle charges and themicroparticle resonance frequency as a function of power and background argon pressure. Combinedwith calculation of the lattice modes the main trends of p MCI as a function of power and backgroundargon pressure are recovered. The threshold of the mode-coupling instability in the crystalline phaseis dominated by the crossing of the longitudinal in-plane lattice mode and the out-of plane latticemode induced by the change of the sheath profile. Ion wakes are shown to have a significant effecttoo.
description: Submitted to Phys. Rev. E
Confirming and extending the hypothesis of universality in sandpiles
Creators: name: Bonachela, Juan A.
name: Munoz, Miguel A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Stochastic sandpiles self-organize to a critical point with scaling behavior different from directed percolation (DP) and characterized by the presence of an additional conservation law. This is usually called C-DP or Manna universality class. There remains, however, an exception to this universality principle: a sandpile automaton introduced by Maslov and Zhang, which was claimed to be in the directed percolation class despite of the existence of a conservation law. In this paper we show, by means of careful numerical simulations as well as by constructing and analyzing a field theory, that (contrarily to what previously thought) this sandpile is also in the C-DP or Manna class. This confirms the hypothesis of universality for stochastic sandpiles, and gives rise to a fully coherent picture of self-organized criticality in systems with a conservation law. In passing, we obtain a number of results for the C-DP class and introduce a new strategy to easily discriminate between DP and C-DP scaling.
description: 6 Figures.9 pages
A flexible control system for atomic, molecular and optical physics experiments
Creators: name: Trenkwalder, Andreas
name: Zaccanti, Matteo
name: Poli, Nicola
Publisher: name: arXiv
Year: 2021
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We have implemented a control system for experiments in atomic, molecular and optical physics based on a commercial low-cost board, featuring a field-programmable gate array as part of a system-on-a-chip on which a Linux operating system is running. The board features Gigabit Ethernet, allowing for fast data transmission and operation of remote experimental systems. A single board can control a set of devices generating digital, analog and radio frequency signals with a precise timing given either by an external or internal clock. Contiguous output and input sampling rates of up to 40 MHz are achievable. Several boards can run synchronously with a timing error approaching 1 ns. For this purpose, a novel auto-synchronization scheme is demonstrated, with possible application in complex distributed experimental setups with demanding timing requests.
description: 15 pages, 10 figures
A cultural analysis of faunal remains from three archaeological sites in Hesquiat Harbour, B.C.
Creators: name: Calvert, Sheila Gay
Publisher: name: University of British Columbia
Year: 2010

description: This study examines the proposition that among the prehistoric hunter-gatherers of Hesquiat Harbour, west coast of Vancouver Island, British Columbia, the geographical area exploited, and hence animal resource selection, was controlled by land use patterns limiting local groups to specific tracts of territory. It suggests that the interaction of the land use system with the environmental diversity of Hesquiat Harbour creates a sub-regional level of resource specialization recognizable in archaeological sites as variation in emphasis on animals from different habitats among the faunal assemblages. A specific proposition, developed from pertinent ethnographic and environmental information, relates land use patterns with a specific pattern of diversity among the faunal assemblages from three archaeological sites, DiSo 1, DiSo 9 and DiSo 16. The emphasis on different habitats one would expect to find at each site are predicted. The faunal assemblages, comprising 49,770 skeletal elements and 135,777.4 grams of shell, are described and compared, using relative frequency of skeletal element count and shell weight. The differences and similarities are discussed in relation to sampling and preservation factors, local environmental change, season of exploitation, change through time in material culture and habitats exploited. A statistically significant association of assemblages with different habitat emphases is found to account for the major proportion of the inter-assemblage variation. Observed patterns of habitat emphases are compared with those predicted. Actual emphases in the assemblages of DiSo 16 and DiSo 1 are positively correlated with the predicted patterns, but those of DiSo 9 differ. The differences are consistent with demonstrated local environmental change and a wider territory of exploitation. The analysis suggests that a simple, autonomous local group level of sociopolitical organization was present in Hesquiat Harbour at least 1,200 years ago and demonstrates that the natural environment defined by socio-cultural organizational factors is an important influence on regional faunal assemblage patterning on the Northwest Coast.
IEEE PES General Meeting 9/6 Miscellaneous Panel Sessions
Creators: J. Hell
D. Kurthakoti
S Glatz
W. Freitas
L. Kristov
C. Root
Publisher: name: IEEE
Year: 2018

2018 PES GM Panel Presentation
This file contains presentations from the following 8/6 (Monday) panel sessions: Hydro and Ocean Energy , Marine Hydrokinetic Synchronous Condenser Application & Renewables Challenges & Opportunities of Sustainability Frontier in Power Systems Monitoring: SWMS Local Energy Markets & Coordination Building the Power Engineer the Industry Needs
The FORM project
Creators: name: Vermaseren, J. A. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The necessity of the FORM project is discussed. Then the evolutionary needs in particle physics are considered, looking at the trends over the years. A guess is made at what will be needed in the (near) future. The whole is concluded with some critical remarks concerning the publication of results and programs.
description: 6 pages, uses axodraw
The observed cosmic star formation rate density has an evolution which resembles a Γ(a, bt) distribution and can be described successfully by only 2 parameters
Creators: name: Katsianis, Antonios
name: Yang, Xiaohu
name: Zheng, Xianzhong
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: A debate is emerging regarding the recent inconsistent results of different studies for the Cosmic Star Formation Rate Density (CSFRD) at high-z. We employ UV and IR datasets to investigate the star formation rate function (SFRF) at ${\rm z \sim 0-9}$. We find that the SFRFs derived from the dust corrected ${\rm UV}$ (${\rm UV_{corr}}$) data contradict those from IR on some key issues since they are described by different distributions (Schechter vs double-power law), imply different physics for galaxy formation (${\rm UV_{corr}}$ data suggest a SFR limit/strong mechanism that diminish the number density of high star forming systems with respect IR) and compare differently with the stellar mass density evolution obtained from SED fitting (${\rm UV_{corr}}$ is in agreement, while IR in tension up to 0.5 dex). However, both tracers agree on a constant CSFRD evolution at ${\rm z \sim 1-4}$ and point to a plateau instead of a peak. In addition, using both indicators we demonstrate that the evolution of the {\it observed} CSFRD can be described by only {\bf 2} parameters and a function that has the form of a Gamma distribution (${\bf Γ(a,bt)}$). In contrast to previous parameterizations used in the literature our framework connects the parameters to physical properties like the star formation rate depletion time and cosmic baryonic gas density. The build up of stellar mass occurs in $Γ(a,bt)$ distributed steps and is the result of gas consumption up to the limit that there is no eligible gas for SF at t = ${\rm \infty}$, resulting to a final cosmic stellar mass density of $\sim 0.5 \times 10^9 \, {\rm \frac{M_{\odot}}{Mpc^3}}$.
description: 21 pages, 3 Figures, Accepted to ApJ
HCN(1-0) enhancement in the bar of NGC 2903
Creators: name: Leon, S.
name: Jeyakumar, S.
name: Perez-Ramirez, D.
name: Verdes-Montenegro, L.
name: Lee, S. W.
name: Flaquer, B. Ocana
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have mapped the \hcn emission from two spiral galaxies, NGC2903 and NGC3504 to study the gas properties in the bars. The HCN(1-0) emission is detected in the center and along the bar of NGC2903. The line ratio HCN(1-0)/CO(1-0) ranges from 0.07 to 0.12 with the lowest value in the center. The enhancement of HCN(1-0) emission along the bar indicates a higher fraction of dense molecular gas in the bar than at the center. The mass of dense molecular gas in the center (2.2x 10^7 Msun) is about 6 times lower than that in the bar (1.2x 10^8 Msun). The total star formation rate (SFR) is estimated to be 1.4 Msun/yr, where the SFR at the center is 1.9 times higher than that in the bar. The time scale of consumption of the dense molecular gas in the center is about 3x 10^7 yr which is much shorter than that in the bar of about 2 to 10 x 10^8 yr. The dynamical time scale of inflow of the gas from the bar to the center is shorter than the consumption time scale in the bar, which suggests that the star formation (SF) activity at the center is not deprived of fuel. In the bar, the fraction of dense molecular gas mass relative to the total molecular gas mass is twice as high along the leading edge than along the central axis of the bar. The \hcn emission has a large velocity dispersion in the bar, which can be attributed partially to the streaming motions indicative of shocks along the bar. In NGC3504, the HCN(2-0) emission is detected only at the center. The fraction of dense molecular gas mass in the center is about 15%. Comparison of the SFR with the predictions from numerical simulations suggest that NGC2903 harbors a young type B bar with a strong inflow of gas toward the center whereas NGC3504 has an older bar and has already passed the phase of inflow of gas toward the center.
description: Acceoted for publication in A&A, 12 figures
Real-Time Voltage Control and Stability Monitoring
Creators: T. Weckesser
D. Duong
K. Uhlen
K. Sun
Publisher: name: IEEE
Year: 2018

2018 PES GM Panel Presentation
The panel session is intended to discuss newly developed techniques to monitor voltage stability conditions in real time through measurements, preferable by PMUs and also recent applications of real-time voltage control and security assessment issues, taking into account the increased presence of inverter controlled generation. The panel presentations will be divided in two parts, the first devoted to recent advancements in real time stability monitoring, while the second part of the panel will be dealing with real-time industry applications.
Power and Energy Magazine - Volume 18: Issue 5 - September/October 2020: Look To The Future
Creators: Satish Kumar Sharma
Tom Tellefsen
Daniel Flores
Peter J. Donalek
Kevin Schönleber
Juan Ignacio Guerrero
Publisher: name: IEEE
Year: 2020

The theme of this issue is the past, present, and future of hydroelectric power
The theme of this issue is the past, present, and future of hydroelectric power
Global well-posedness issues for the inviscid Boussinesq system with Yudovich's type data
Creators: name: Danchin, R.
name: Paicu, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35Q35,76N10,35B65,76D99

description: The present paper is dedicated to the study of the global existence for the inviscid two-dimensional Boussinesq system. We focus on finite energy data with bounded vorticity and we find out that, under quite a natural additional assumption on the initial temperature, there exists a global unique solution. None smallness conditions are imposed on the data. The global existence issues for infinite energy initial velocity, and for the Bénard system are also discussed.
description: 12 pages
Non-linear regression models for Approximate Bayesian Computation
Creators: name: Blum, M. G. B.
name: Francois, O.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Computation (stat.CO)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: Approximate Bayesian inference on the basis of summary statistics is well-suited to complex problems for which the likelihood is either mathematically or computationally intractable. However the methods that use rejection suffer from the curse of dimensionality when the number of summary statistics is increased. Here we propose a machine-learning approach to the estimation of the posterior density by introducing two innovations. The new method fits a nonlinear conditional heteroscedastic regression of the parameter on the summary statistics, and then adaptively improves estimation using importance sampling. The new algorithm is compared to the state-of-the-art approximate Bayesian methods, and achieves considerable reduction of the computational burden in two examples of inference in statistical genetics and in a queueing model.
description: 4 figures; version 3 minor changes; to appear in Statistics and Computing
Power and Energy Magazine - Volume 18: Issue 4 - July/August 2020: A Resilient Grid
Creators: Hong Chen
Carsten Roggatz
Rodrigo Moreno
Martin Braun
Hyde M. Merrill
Publisher: name: IEEE
Year: 2020

This issue shares experience
worldwide that identifies resilience
issues, lessons learned, and innovative solutions.
This issue shares experience
worldwide that identifies resilience
issues, lessons learned, and innovative solutions.
Probing the nature of cosmic acceleration
Creators: name: Zhang, Hongsheng
name: Yu, Heng
name: Noh, Hyerim
name: Zhu, Zong-Hong
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The cosmic acceleration is one of the most significant cosmological discoveries over the last century. The two categories of explanation are exotic component (dark energy) and modified gravity. We constrain the two types of model by a joint analysis with perturbation growth and direct $H(z)$ data. Though the minimal $χ^2$ of the $Λ$CDM is almost the same as that of DGP, in the sense of consistency we find that the dark energy ($Λ$CDM) model is more favored through a detailed comparison with the corresponding parameters fitted by expansion data.
description: 10 pages, 6 figures, typo corrected