cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Resilience Framework, Methods, and Metrics for the Electricity Sector
Creators: Bill Chiu
SCE
Anjan Bose
Washington State University
Scott Brown
Exelon
Babu Chalamala
Sandia National Laboratory
Darcy Immerman
AECOM
Amin Khodaei
University of Denver
Jay Liu
PJM
Jim Mazurek
Accenture
Damir Novosel
ITS LC Chair
Quanta
Publisher: name: IEEE
Year: 2020

The resilience of the electric grid is the foundational building block for our decarbonized clean energy future. While the concept of resiliency is not new, its application to the electric grid is not as straightforward due to the lack of a consistent definition of resilience or a mature set of metrics by which resilience or its application can be measured. This report provides an overview of resilience definitions, including its relationship with reliability, the existing frameworks for holistically defining resilience planning and implementation process, and the metrics to evaluate and benchmark resilience. It provides recommendations on how to use those frameworks and metrics and evaluates technologies, tools, and methods to improve electrical system resilience. To provide a practical perspective to addressing resilience, the report includes the progress made by electric grid operators in collaboration with regional authorities to strengthen the resilience posturing, including some of the more common practices and use cases to increase system resilience, enhance broader preparedness, and to combat the impacts of the various external impacts to the electric power grid. Those use cases include Southern California Edison, Con Edison, Entergy, Florida utilities, San Diego Gas & Electric, ComEd, Austin Energy, as well as transmission and distribution system hardening practices, wild-fire risk mitigation lessons learned from California, and NERC reliability and cyber-security standards.
Design and Implementation of Real-Time Mpsoc FPGA Based Electromagnetic Transient Emulator of CIGR DC Grid for HIL Application
Creators: Zhuoxuan Shen
Tong Duan
and Venkata Dinavahi
Publisher: name: IEEE
Year: 2018

PES Open Access Paper
Real time electromagnetic transient simulation is a powerful tool for the power system transient study and the hardware-in-the-loop (HIL) testing. Large scale DC grid can meet the flexible transmission requirements with high power efficiency and high controllability. CIGRE working group has proposed a DC grid test system, which covers various HVDC configurations and deploys modular multi-level converters (MMCs) in the grid. This work focuses on the efficient solution of the DC grid real-time emulator providing accurate and detailed results. The design and implementation of the CIGRE DC grid are carried out on a hybrid MPSoC-FPGA platform realizing the synergy between the Xilinx Vitrex UltraScale FPGA device containing a large number of logic resources and Xilinx Zynq UltraScale MPSoC device containing the ARM multi-core processing system and FPGA resources on a single chip. Hybrid modeling methodology using device-level electrothermal model, equivalent circuit model, and average value model for the converters is employed to present the detailed device-level results of local equipment and the accurate system-level results of global interactions of the DC grid. The detailed design partitioning and implementation methods are presented, and the real-time results are captured by the oscilloscope and validated with commercial simulation tools PSCAD EMTDC and SaberRD.
Parallel Transport and Functors
Creators: name: Schreiber, Urs
name: Waldorf, Konrad
Publisher: name: arXiv
Year: 2007
Subjects: subject: Differential Geometry (math.DG)
subject: Category Theory (math.CT)
subject: FOS: Mathematics
subject: 53C05, 18B40, 55R10

description: Parallel transport of a connection in a smooth fibre bundle yields a functor from the path groupoid of the base manifold into a category that describes the fibres of the bundle. We characterize functors obtained like this by two notions we introduce: local trivializations and smooth descent data. This provides a way to substitute categories of functors for categories of smooth fibre bundles with connection. We indicate that this concept can be generalized to connections in categorified bundles, and how this generalization improves the understanding of higher dimensional parallel transport.
description: 73 pages, 1 figure. Version 2 contains several improvements, in particular concerning the proofs of Lem. 2.15 and of Prop. 4.7, and the discussion in Appendix A2. Some notation has also been changed. Version 3 comes with an extended discussion of groupoid bundles with connection. Version 4 is the published version. In Version 5 we have replaced parts of the proof of Prop. 4.7 by better arguments
Bundesländer-Atlas Open Access / Atlas on Open Access in German Federal States
Creators: name: Kindling, Maxi
name: Kobialka, Sophie
name: Martin, Linda
name: Neufend, Maike
Publisher: name: Zenodo
Year: 2021
Subjects: Open Access, Bundesländer-Atlas, Bundesländer, Institutionen, Atlas, Federal states, Germany, Institutions, Open Access activities, Open Access Monitoring

description: Konzeptpapier Bundesländer-Atlas Open Access im Rahmen des BMBF-geförderten Projekts open-access.network (Version 1.0) / Concept paper on the Atlas on Open Access in German Federal States, a project funded by the Federal Ministry of Education and Research (Version 1.0)
Room-temperature ferroelectric switching of spin-to-charge conversion in GeTe
Creators: name: Varotto, Sara
name: Nessi, Luca
name: Cecchi, Stefano
name: Sławińska, Jagoda
name: Noël, Paul
name: Petrò, Simone
name: Fagiani, Federico
name: Novati, Alessandro
name: Cantoni, Matteo
name: Petti, Daniela
name: Albisetti, Edoardo
name: Costa, Marcio
name: Calarco, Raffaella
name: Nardelli, Marco Buongiorno
name: Bibes, Manuel
name: Picozzi, Silvia
name: Attané, Jean-Philippe
name: Vila, Laurent
name: Bertacco, Riccardo
name: Rinaldi, Christian
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Since its birth in the 1990s, semiconductor spintronics has suffered from poor compatibility with ferromagnets as sources of spin. While the broken inversion symmetry of some semiconductors may alternatively allow for spin-charge interconversion, its control by electric fields is volatile. Ferroelectric Rashba semiconductors stand as appealing materials unifying semiconductivity, large spin-orbit coupling, and non-volatility endowed by ferroelectricity. However, their potential for spintronics has been little explored. Here, we demonstrate the non-volatile, ferroelectric control of spin-to-charge conversion at room temperature in epitaxial GeTe films. We show that ferroelectric switching by electrical gating is possible in GeTe despite its high carrier density. We reveal a spin-to-charge conversion as effective as in Pt, but whose sign is controlled by the orientation of the ferroelectric polarization. The comparison between theoretical and experimental data suggests that spin Hall effect plays a major role for switchable conversion. These results open a route towards devices combining spin-based logic and memory integrated into a silicon-compatible material.
description: 21 pages, 4 figures
Five-quark picture of Lambda(1405) in anisotropic lattice QCD
Creators: name: Ishii, Noriyoshi
name: Doi, Takumi
name: Oka, Makoto
name: Suganuma, Hideo
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: Five-quark (5Q) picture of Lambda(1405) is studied using quenched lattice QCD with an exotic 5Q operator of N\bar{K} type. To discreminate mere N\bar{K} and Σπscattering states, Hybrid Boundary Condition (HBC), a flavor-dependent boundary condition, is imposed on the quark fields along spatial direction. 5Q mass m_{5Q}\simeq 1.89 GeV is obtained after the chiral extrapolation to the physical quark mass region, which is too heavy to be identified with Lambda(1405). Then, Lambda(1405) seems neither a pure 3Q state nor a pure 5Q state, and therefore we present an interesting possibility that Lambda(1405) is a mixed state of 3Q and 5Q states.
description: A talk given at Yukawa International Seminar(YKIS) 2006 NEW FRONTIERS IN QCD --Exotic Hadrons and Hadronic Matter--, Kyoto, Japan, Nov. 20-Dec.8 2006, 4 pages, 2 figures
Component sizes in networks with arbitrary degree distributions
Creators: name: Newman, M. E. J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We give an exact solution for the complete distribution of component sizes in random networks with arbitrary degree distributions. The solution tells us the probability that a randomly chosen node belongs to a component of size s, for any s. We apply our results to networks with the three most commonly studied degree distributions -- Poisson, exponential, and power-law -- as well as to the calculation of cluster sizes for bond percolation on networks, which correspond to the sizes of outbreaks of SIR epidemic processes on the same networks. For the particular case of the power-law degree distribution, we show that the component size distribution itself follows a power law everywhere below the phase transition at which a giant component forms, but takes an exponential form when a giant component is present.
description: 5 pages, 1 figure
Entanglement in a Jaynes-Cummings Model with Two Atoms and Two Photon Modes
Creators: name: Masood, Samina S.
name: Miller, Allen
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate the conditions of entanglement for a system of two atoms and two photon modes in vacuum, using the Jaynes-Cummings model in the rotating-wave approximation. It is found, by generalizing the existing results, that the strength of entanglement is a periodic function of time. We explicitly show that our results are in agreement with the existing results of entanglement conditions under appropriate limits. Results for the two-atom and two-photon system are generalized to the case of arbitrary values for the atomic energies, corresponding to photon modes frequencies. Though it is apparently a generalization of the existing work, we have considered for the first time both the resonant and nonresonant conditions and found a general equation which could be true for both cases. Moreover, we show that periodicity of the entanglement is a distinct feature of resonant system. Considering the two atoms and two photons system, in detail, we setup an approach which could be generalized for many particle systems and the resulting master equation can also be analyzed.
description: 11 pages and 1 figure
A unified view of likelihood ratio and reparameterization gradients
Creators: name: Parmas, Paavo
name: Sugiyama, Masashi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: Reparameterization (RP) and likelihood ratio (LR) gradient estimators are used to estimate gradients of expectations throughout machine learning and reinforcement learning; however, they are usually explained as simple mathematical tricks, with no insight into their nature. We use a first principles approach to explain that LR and RP are alternative methods of keeping track of the movement of probability mass, and the two are connected via the divergence theorem. Moreover, we show that the space of all possible estimators combining LR and RP can be completely parameterized by a flow field $u(x)$ and an importance sampling distribution $q(x)$. We prove that there cannot exist a single-sample estimator of this type outside our characterized space, thus, clarifying where we should be searching for better Monte Carlo gradient estimators.
description: AISTATS2021; Earlier paper was split in two (arXiv:1910.06419). Refer to the current paper for the unified view, but see the earlier paper for discussion on an importance sampling technique
Sex differences in mathematics in Scotland
Creators: name: Kerr, Peter
Publisher: name: University of British Columbia
Year: 2010

description: This study examines sex differences in mathematics in Scotland. The study is based on longitudinal data from the 1985 Scottish School Leavers Surve3r of 5726 students in one school district. It compares the distribution of scores for boys and girls on the 1984 Ordinary Grade (O-grade) Arithmetic examination, taken by the majority of Scottish students at the end of compulsory schooling, and matches these results with indicators of male and female ability, socioeconomic status (SES), previous arithmetic achievement in primary school, and destinations upon completion of compulson' schooling. The findings suggest that boys slightly outperformed girls on the O-grade Arithmetic examination. Girls were more likely to present for this examination, but more girls than boys scored at the lower end of the distribution. These differences did not vary substantially for pupils at different levels of ability, SES, or prior achievement in arithmetic. The gender gap in mathematics favoring boys, however, did become significant after the period of compulsory schooling. More girls than boys stayed on at school, but fewer of them elected to take further training in mathematics. Boys took more advanced mathematics courses in the last two years of high school and performed better than girls on those courses. Policy implications of these findings and directions for research are discussed. Teachers and counsellors must become informed about the lack of female persistence in mathematics and take steps to alleviate it. Future research should examine why girls in Scotland do not keep up with boys and the factors that have enabled some girls to overcome this general tendency.
GECKO Optical Follow-up Observation of Three Binary Black Hole Merger Events: GW190408_181802, GW190412, and GW190503_185404
Creators: name: Kim, Joonho
name: Im, Myungshin
name: Paek, Gregory S. H.
name: Lee, Chung-Uk
name: Kim, Seung-Lee
name: Chang, Seo-Won
name: Choi, Changsu
name: Hwang, Sungyong
name: Kang, Wonseok
name: Kim, Sophia
name: Kim, Taewoo
name: Lee, Hyung Mok
name: Lim, Gu
name: Seo, Jinguk
name: Sun, Hyun-Il
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present optical follow-up observation results of three binary black hole merger (BBH) events, GW190408_181802, GW190412, and GW190503_185404, which were detected by the Advanced LIGO and Virgo gravitational wave (GW) detectors. Electromagnetic (EM) counterparts are generally not expected for BBH merger events. However, some theoretical models suggest that EM counterparts of BBH can possibly arise in special environments, prompting motivation to search for EM counterparts for such events. We observed high-credibility regions of the sky for the three BBH merger events with telescopes of the Gravitational-wave EM Counterpart Korean Observatory (GECKO), including the KMTNet. Our observation started as soon as 100 minutes after the GW event alerts and covered 29 - 63 deg$^2$ for each event with a depth of $\sim$ 22.5 mag in $R$-band within hours of observation. No plausible EM counterparts were found for these events, but from no detection in the GW190503_185404 event, for which we covered 69% credibility region, we place the BBH merger EM counterpart signal to be $M_{g}$ > -18.0 AB mag within about 1 day of the GW event. The comparison of our detection limits with light curves of several kilonova models suggests that a kilonova event could have been identified within hours from GW alert with GECKO observations if the compact merger happened at < 400 Mpc and the localization accuracy was of order of 50 deg$^2$. Our result gives a great promise for the GECKO facilities to find EM counterparts within a few hours from GW detection in future GW observation runs.
description: 14 pages, 3 figures, accepted for publication in ApJ
Dinlarning paydo bo'lishi haqidagi tasavvurlar va ularning inson  dunyoqarashiga ta'siri
Creators: name: Sh.Sh.Shodiyev, TATU SAMARQAND filiali TTKT fakulteti AKT-2301 guruhi talabasi
name: Ilmiy rahbar: X.U.Samatov
Publisher: name: Zenodo
Year: 2023

description: Ilk  diniy  e'tiqodlarning  vujudga  kelishidagi  tarixiy-tadrijiy bosqichlar,  kishilarda  ilk  diniy  e'tiqodning  shakllanishi,  ilk  diniy e'tiqodlarning  qachon  va  qaysi  mintaqalarda  vujudga  kelganligi, insonlarning  u  e'tiqodlarni  qabul  qilishdagi  qarashlari,  ilk  diniy e'tiqodlarning diniy, ilmiy, ma'naviy, tarixiy zamonaviy ko'rinishlari haqida tushuncha va tasavvurlarni shakllantiradi.
Simultaneous determination of mass parameter and radial marker in Schwarzschild geometry
Creators: name: Varela, Victor
name: Leal, Lorenzo
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We show that mass parameter and radial coordinate values can be indirectly measured in thought experiments performed in Schwarzschild spacetime, without using the Newtonian limit of general relativity or approximations based on Euclidean geometry. Our approach involves different proper time quantifcations as well as solutions to systems of algebraic equations, and aims to strengthen the conceptual independence of general relativity from Newtonian gravity.
Higher Derivative Corrections in Holographic QCD
Creators: name: Basu, Anirban
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider the effect of the R^4 term in type IIA string theory on the supergravity background dual to N_c D4 branes compactified on a circle with supersymmetry breaking boundary conditions. We study the dynamics of D8 branes in this perturbed geometry in the probe approximation. This leads to an analysis of higher derivative corrections in holographic QCD beyond the supergravity approximation. We make a rough estimate of the corrections to the masses of some of the lightest (axial) vector mesons. The corrections are suppressed by a factor of (g_{YM}^2 N_c)^{-3} compared to their supergravity values. We find that the masses of these mesons increase from their supergravity values.
description: 24 pages, LaTeX
The Vertical Position of Sr Dopants in the Sr$_x$Bi$_2$Se$_3$ Superconductor
Creators: name: Lin, You-Ron
name: Bagchi, Mahasweta
name: Soubatch, Serguei
name: Lee, Tien-Lin
name: Brede, Jens
name: Bocquet, François C.
name: Kumpf, Christian
name: Ando, Yoichi
name: Tautz, F. Stefan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The discovery of topological superconductivity in doped Bi$_2$Se$_3$ made this class of materials highly important for the field of condensed matter physics. However, the structural origin of the superconducting state remained elusive, despite being investigated intensively in recent years. We use scanning tunneling microscopy and the normal incidence x-ray standing wave (NIXSW) technique in order to determine the vertical position of the dopants -- one of the key parameters for understanding topological superconductivity in this material -- for the case of Sr$_{x}$Bi$_2$Se$_3$. In a novel approach we analyze the NIXSW data in consideration of the inelastic mean free path of the photoemitted electrons, which allows us to distinguish between symmetry equivalent sites. We find that Sr-atoms are not situated inside the van der Waals gap between the Bi$_2$Se$_3$ quintuple layers but rather in the quintuple layer close to the outer Se planes.
description: 13 pages, 9 figures, 2 tables
On Sound Reflection in Superfluid
Creators: name: Melnikovsky, L. A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We consider reflection of the first and the second sound waves by a rigid flat wall in superfluid. Nontrivial dependence of the reflection coefficients on the angle of incidence is obtained. Sound conversion is predicted at slanted incidence.
description: 9 pages, 4 figures
Defining, Evaluating, Preparing for and Responding to a Cyber Pearl Harbor
Creators: name: Straub, Jeremy
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cryptography and Security (cs.CR)
subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: Despite not having a clear meaning, public perception and awareness makes the term cyber Pearl Harbor an important part of the public discourse. This paper considers what the term has meant and proposes its decomposition based on three different aspects of the historical Pearl Harbor attack, allowing the lessons from Pearl Harbor to be applied to threats and subjects that may not align with all aspects of the 1941 attack. Using these three definitions, prior attacks and current threats are assessed and preparation for and response to cyber Pearl Harbor events is discussed.
title: Основные аспекты банковского кредитования и розничный бизнес
Creators: name: ELS IPR BOOKS
Publisher: name: Международный банковский институт имени Анатолия Собчака
Year: 2020

description: В учебном пособии исследуются современные проблемы развития банковского кредитования и розничного бизнеса кредитных организаций, вопросы улучшения качества обеспечения кредитов и возможности повышения ликвидности кредитных организаций. Учебное пособие предназначено для студентов бакалавриата, обучающихся по направлениям «Экономика», «Менеджмент», также может быть интересно для магистрантов и аспирантов.
Who were the daughters of Allah?
Creators: name: Randsalu, Donna
Publisher: name: University of British Columbia
Year: 2010

description: Who were the Daughters of Allah, the three Arabian goddesses mentioned in the Qur'an and venerated by the pagan Arabs prior to the rise of Islam, and who since have vanished into obscurity? Can we reconstruct information about these goddesses by reference to earlier goddesses of the Near East? It is our intention to explore this possibility through an examination of their predecessors in view of the links between the Fertile Crescent and the Arabian Peninsula. Moving back in time from the seventh century A.D. (Arabia) through the Hellenistic Period (Syro/Phoenicia 300 B.C.-A.D. 300 ) to the end of the second millennium, we shall examine those goddesses whose attributes most closely resemble the Arabian goddesses. By necessity, we will confine ourselves primarily to the goddesses of ancient Canaan¹ (Astarte) and Syria (Atargatis), compelling resemblances of these goddesses to the Arabian goddesses of the seventh century being the basis for their selection. This exploration, then, takes place in the Fertile Crescent, that region of the Near East "forming an arc between the head of the Persian Gulf and the south-east corner of the Mediterranean Sea"². These lands are a natural physical extension of the Arabian Peninsula and its inhabitants naturally migrated into these regions. As well, there is the linguistic, and, therefore, cultural, affinity of the Semitic peoples of the Fertile Crescent with those of the Arabian Peninsula, so that a search for the heritage of the Arabian goddesses would be likely to begin here. ¹Canaan (Syria, Phoenicia, Palestine) in early times extended from Hamath in the north to Gaza (Gen.10.19), and included lands east and west of the Jordan (Josh.11.3). ²Philip K. Hitti, History of the Arabs; From the Earliest Times to the Present, 10th ed. (New York: St. Martin's Press, 1979),11.
The number of populated electronic configurations in a hot dense plasma
Creators: name: Krief, Menahem
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Atomic Physics (physics.atom-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: In hot dense plasmas of intermediate or high-Z elements in the state of local thermodynamic equilibrium, the number of electronic configurations contributing to key macroscopic quantities such as the spectral opacity and equation of state, can be enormous. In this work we present systematic methods for the analysis of the number of relativistic electronic configurations in a plasma. While the combinatoric number of configurations can be huge even for mid-Z elements, the number of configurations which have non negligible population is much lower and depends strongly and non-trivially on temperature and density. We discuss two useful methods for the estimation of the number of populated configurations: (i) using an exact calculation of the total combinatoric number of configurations within superconfigurations in a converged super-transition-array (STA) calculation, and (ii) by using an estimate for the multidimensional width of the probability distribution for electronic population over bound shells, which is binomial if electron exchange and correlation effects are neglected. These methods are analyzed, and the mechanism which leads to the huge number of populated configurations is discussed in detail. Comprehensive average atom finite temperature density functional theory (DFT) calculations are performed in a wide range of temperature and density for several low, mid and high Z plasmas. The effects of temperature and density on the number of populated configurations are discussed and explained.
New Search for tau -> mu gamma and tau -> e gamma Decays at Belle
Creators: name: Hayasaka, K.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We report on a search for the lepton flavor violating tau- -> mu- gamma and tau- -> e- gamma decays based on 535/fb of data accumulated at the Belle experiment. No signal is found and we set 90% confidence level upper limits on the branching ratios Br(tau- -> mu- gamma) < 4.5x10^-8 and Br(tau- -> e- gamma) < 1.2x10^-7.
description: 15 pages, 13 figures, the exponent of the upper limit for the tau -> e gamma in the abstract is corrected
First Measurement of the W Boson Mass in Run II of the Tevatron
Creators: name: Aaltonen, T.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present a measurement of the W boson mass using 200/pb of data collected in pbar p collisions at sqrt(s) = 1.96 TeV by the CDF II detector at Run II of the Fermilab Tevatron. With a sample of 63964 W -> e nu candidates and 51128 W -> mu nu candidates, we measure M_W = (80413 +- 34 (stat) +- 34 (syst) = 80413 +- 48) MeV/c^2. This is the most precise single measurement of the W boson mass to date.
description: published version in PRL
Real Zeros and Partitions without singleton blocks
Creators: name: Bóna, Miklós
name: Mező, István
Publisher: name: arXiv
Year: 2007
Subjects: subject: Combinatorics (math.CO)
subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 05A16, 05A15

description: We prove that the generating polynomials of partitions of an $n$-element set into non-singleton blocks, counted by the number of blocks, have real roots only and we study the asymptotic behavior of the leftmost roots. We apply this information to find the most likely number of blocks.
description: 16 pages
Exploiting Nonlinear Recurrence and Fractal Scaling Properties for Voice Disorder Detection
Creators: name: Little, Max A
name: McSharry, Patrick E
name: Roberts, Stephen J
name: Costello, Declan AE
name: Moroz, Irene M
Publisher: name: arXiv
Year: 2007
Subjects: subject: Cellular Automata and Lattice Gases (nlin.CG)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: Voice disorders affect patients profoundly, and acoustic tools can potentially measure voice function objectively. Nonetheless, existing tools are limited to analysing voices displaying near periodicity, and do not account for inherent biophysical nonlinearity and non-Gaussian randomness. They do not directly measure complex nonlinear aperiodicity, and turbulent, aeroacoustic, non-Gaussian randomness. Often these tools have limited clinical usefulness. This paper introduces two new tools to speech analysis: recurrence and fractal scaling, which overcome the range limitations of existing tools by addressing directly these two symptoms of disorder, and a simple bootstrapped classifier distinguishes normal from disordered voices to 91.8% overall accuracy on a large database of subjects with a wide variety of voice disorders. They are widely applicable to the whole range of disordered voice phenomena by design. These new measures could therefore be used for a variety of practical clinical purposes.
description: 1 ZIP file containing 1 LaTeX file, 6 EPS figures, 1 BBL file, 1 BST and 1 CLS file. Eprint for Biomed Eng Online, 2007 Jun 26, 6(1):23
Dilute dispersion of compound particles: deformation dynamics and rheology
Creators: name: Singeetham, Pavan Kumar
name: S., Chaithanya K. V.
name: Thampi, Sumesh P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Compound particles are a class of composite systems in which solid particles encapsulated in a fluid droplet are suspended in another fluid. They are encountered in various natural and biological processes, for e.g., nucleated cells, hydrogels, microcapsules etc. In this work, we analyze the flow in and around a concentric compound particle and investigate the deformation and reorientation dynamics of the confining drop and its stability against breakup in imposed linear flows. We obtain analytical expressions for the flow fields upto O(Ca) (capillary number) and the deformed shape of the confining drop upto O(Ca^2) using a domain perturbation technique. Further, we develop an O(Ca) constitutive equation for the volume-averaged stress for a dilute dispersion of compound particles. Compared to linear theory, O(Ca^2) calculations are found to be important as they make qualitatively different predictions in some linear flows. We find that the strong hydrodynamic interaction between the encapsulated particle and the confining interface results in an increased deformation of the confining drop compared to that of a simple drop, and enhances the rheological quantities such as the effective shear viscosity, extensional viscosity, and normal stress differences in a dilute dispersion. These measures pertaining to particles, drops, and particles coated with a fluid film are also derived as limiting cases of compound particles. Moreover, linear viscoelastic behavior of a dilute dispersion of compound particles is characterized in terms of complex modulus by subjecting the dispersion to a small amplitude oscillatory shear flow.
Simulation of multi-species flow and heat transfer using physics-informed neural networks
Creators: name: Laubscher, Ryno
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: In the present work, single- and segregated-network PINN architectures are applied to predict momentum, species and temperature distributions of a dry air humidification problem in a simple 2D rectangular domain. The created PINN models account for variable fluid properties, species- and heat-diffusion and convection. Both the mentioned PINN architectures were trained using different hyperparameter settings, such as network width and depth to find the best-performing configuration. It is shown that the segregated-network PINN approach results in on-average 62% lower losses when compared to the single-network PINN architecture for the given problem. Furthermore, the single-network variant struggled to ensure species mass conservation in different areas of the computational domain, whereas, the segregated approach successfully maintained species conservation. The PINN predicted velocity, temperature and species profiles for a given set of boundary conditions were compared to results generated using OpenFOAM software. Both the single- and segregated-network PINN models produced accurate results for temperature and velocity profiles, with average percentage difference relative to the CFD results of approximately 7.5% for velocity and 8% for temperature. The mean error percentages for the species mass fractions are 9\% for the single-network model and 1.5% for the segregated-network approach. To showcase the applicability of PINNs for surrogate modelling of multi-species problems, a parameterised version of the segregated-network PINN is trained which could produce results for different water vapour inlet velocities. The normalised mean absolute percentage errors, relative to the OpenFOAM results, across three predicted cases for velocity and temperature are approximately 7.5% and 2.4% for water vapour mass fraction.
Perverse coherent sheaves and the geometry of special pieces in the unipotent variety
Creators: name: Achar, Pramod N.
name: Sage, Daniel S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Representation Theory (math.RT)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 20G05, 14F43, 18E30

description: Let X be a scheme of finite type over a Noetherian base scheme S admitting a dualizing complex, and let U be an open subset whose complement has codimension at least 2. We extend the Deligne-Bezrukavnikov theory of perverse coherent sheaves by showing that a coherent middle extension (or intersection cohomology) functor from perverse sheaves on U to perverse sheaves on X may be defined for a much broader class of perversities than has previously been known. We also introduce a derived category version of the coherent middle extension functor. Under suitable hypotheses, we introduce a construction (called "S2-extension") in terms of perverse coherent sheaves of algebras on X that takes a finite morphism to U and extends it in a canonical way to a finite morphism to X. In particular, this construction gives a canonical "S2-ification" of appropriate X. The construction also has applications to the "Macaulayfication" problem, and it is particularly well-behaved when X is Gorenstein. Our main goal, however, is to address a conjecture of Lusztig on the geometry of special pieces (certain subvarieties of the unipotent variety of a reductive algebraic group). The conjecture asserts in part that each special piece is the quotient of some variety (previously unknown in the exceptional groups and in positive characteristic) by the action of a certain finite group. We use S2-extension to give a uniform construction of the desired variety.
description: 30 pages; minor corrections and additions
Recursive n-gram hashing is pairwise independent, at best
Creators: name: Lemire, Daniel
name: Kaser, Owen
Publisher: name: arXiv
Year: 2007
Subjects: subject: Databases (cs.DB)
subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences
subject: H.3.3, H.2.7

description: Many applications use sequences of n consecutive symbols (n-grams). Hashing these n-grams can be a performance bottleneck. For more speed, recursive hash families compute hash values by updating previous values. We prove that recursive hash families cannot be more than pairwise independent. While hashing by irreducible polynomials is pairwise independent, our implementations either run in time O(n) or use an exponential amount of memory. As a more scalable alternative, we make hashing by cyclic polynomials pairwise independent by ignoring n-1 bits. Experimentally, we show that hashing by cyclic polynomials is is twice as fast as hashing by irreducible polynomials. We also show that randomized Karp-Rabin hash families are not pairwise independent.
description: See software at https://github.com/lemire/rollinghashcpp
Bayesian estimates of free energies from nonequilibrium work data in the presence of instrument noise
Creators: name: Maragakis, Paul
name: Ritort, Felix
name: Bustamante, Carlos
name: Karplus, Martin
name: Crooks, Gavin E.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The Jarzynski equality and the fluctuation theorem relate equilibrium free energy differences to non-equilibrium measurements of the work. These relations extend to single-molecule experiments that have probed the finite-time thermodynamics of proteins and nucleic acids. The effects of experimental error and instrument noise have not previously been considered. Here, we present a Bayesian formalism for estimating free-energy changes from non-equilibrium work measurements that compensates for instrument noise and combines data from multiple driving protocols. We reanalyze a recent set of experiments in which a single RNA hairpin is unfolded and refolded using optical tweezers at three different rates. Interestingly, the fastest and farthest-from-equilibrium measurements contain the least instrumental noise, and therefore provide a more accurate estimate of the free energies than a few slow, more noisy, near-equilibrium measurements. The methods we propose here will extend the scope of single-molecule experiments; they can be used in the analysis of data from measurements with AFM, optical, and magnetic tweezers.
description: 8 pages
Attribution and denial in socially desirable responding
Creators: name: Reid, Douglas Baird
Publisher: name: University of British Columbia
Year: 2010

description: Paulhus's (1984) Balanced Inventory of Desirable Responding (BIDR) contains scales designed to assess the two major components of socially desirable responding. The Self-Deception Scale (SDS) assesses the tendency to give favorably biased but honestly-held self-descriptions; the Impression Management Scale (IMS) assesses the tendency to give deliberately favorable self-descriptions. Research by Millham (1974) and Roth, Snyder and Pace (1986) has distinguished two tactics of desirable responding: (a) attribution: the claiming of positive attributes, and (b) denial: the rejection of negative attributes. This thesis presents three studies designed to evaluate the relative importance of these two distinctions in the BIDR. The first study, a factor analysis of 130 cases, demonstrated that both the content (self-deception vs. impression-management) and tactic (attribution vs. denial) were important in determining responses to the BIDR. The IMS items, including both attribution and denial, formed one factor. The attribution SDS items fell on a second factor. Surprisingly, the denial SDS items fell closer to the IMS factor. Rosenberg's Self-Esteem scale was most highly correlated with the attribution SDS items. Study 2 was a similar factor analysis of the data from a much larger dataset (N = 670). The factor pattern was identical to that in Study 1. Moreover, the SDS attribution items again predicted adjustment, including high self-esteem, low social anxiety and low empathic distress. Study 3 (N = 137) was designed to determine whether the critical difference between the attribution and denial items depends on: (a) whether the item refers to positive or negative attributes, or (b) whether the statement as a whole is favorable or unfavorable. To test these competing hypotheses, 20 negations were written, one for each of the 20 original assertions on the SDS. Results showed that items referring to positive characteristics (I am a saint; I am not a saint) formed a distinct factor from items referring to negative characteristics (I am a sinner; I am not a sinner). Simple negations (I am not a sinner) fell on the same factor as their corresponding assertions (I am a sinner) but at the opposite pole. Finally, the correlations with various personality measures were consistent with Studies 1 and 2. These results clarify the distinction between attribution and denial components. The distinction is not simply one of keying direction, that is, whether the statement as a whole is desirable or undesirable. Rather, the critical factor is whether the item content refers to a positive or negative characteristic. This distinction is critical in measuring self-deception, but not impression management.
Presentation of Peer Community In
Creators: name: Bourguet, Denis
name: Facon, Benoit
name: Guillemaud, Thomas
name: Hamelin, Marjolaine
Publisher: name: Zenodo
Year: 2018
Subjects: preprints, peer-review, submission by authors, recommendation platform, Publish-Review-curate, Open Science, bibliodiversity

description: The “Peer Community in” (PCI) is a non-profit scientific organization that aims to create specific communities of researchers reviewing and recommending, for free, unpublished preprints in their field (i.e. unpublished articles deposited on open online archives like arXiv.org and bioRxiv.org). To a lesser extent, they may also recommend postprints (i.e. articles already published in journals). These specific communities are entitled Peer Community in X, e.g. Peer Community in Evolutionary Biology (PCI Evol Biol), Peer Community in Ecology (PCI Ecol), Peer Community inPaleontology (PCI Paleo) etc ... Once recommended by one or several of these PCIs on the basis of rigorous peer reviews, preprints become valid references and may be considered to be articles of high value. Recommended preprints can be used by scientists and cited in the scientific literature. There is no need for these recommended preprints to be submitted for publication in classic journals (although they can be, according to the authors’ preferences). Authors can then leave their recommended article as a recommended preprint in a preprint server, or transfer it directly for publication in the the diamond open-access Peer community Journal or submit it to one of the PCI-friendly journals or to any other journals accepting submissions of preprints.
description: A free recommendation process of scientific preprints based on peer-reviews, upon authors' submission
Investigation of Mesenchymal cells in the Microfluidic Cell Culture Device
Creators: name: ÖZEL, Ceren
name: KOÇ, Yücel
name: TOPAL, Ahmet Emin
name: Aliakbar EBRAHIMI
name: SENGEL, Tayfun
name: GHORBANPOOR, Hamed
name: GUZEL, Fatma Dogan
name: UYSAL, Onur
name: SARIBOYACI, Ayla Eker
name: AVCI, Hüseyin
Publisher: name: Zenodo
Year: 2021

description: Mesenchymal stem cells (MSCs), as multipotent stem cells, can be obtained from many tissues/organs including bone marrow, adipose tissue, dental pulp, and amniotic or synovial fluids1. MSCs are unique cells that can support functions of many tissues and organs by releasing soluble factors such as growth factors, anti-apoptotic and anti-inflammation factors, and they can synthesize extracellular matrix (ECM) mainly composed of collagen fibrils, a key component of tissues. In damaged tissues, MSCs can help the formation of new blood vessels by secreting angiogenic factors. Therefore, MSCs are very helpful for reducing the inflammation2, decreasing the progress of autoimmune diseases3 and preventing rejection of transplant4. Our objective in this study is to use MSCs as supportive /feeder cells for the maintenance of liver cells including cell adhesion, cell growth and proliferation other biological activity in microfluidic chip by benefitting from such protective and regenerative properties of MSCs for tissues. To accomplish this aim, as part of a liver-on-a-chip study, we investigate the behavior of MSCs in microfluidic (MF) culture by monitoring cell viability, proliferation, cell numbers, and the expression of MSC-specific genes. Moreover, we will investigate the effect of MSCs on the viability and maintenance of liver cells within the MF-chip conducted by co-culture of MSCs with liver cells.
Non-abelian infrared divergences on the celestial sphere
Creators: name: Magnea, Lorenzo
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider the infrared factorisation of non-abelian multi-particle scattering amplitudes, and we study the form of the universal colour operator responsible for infrared divergences, when expressed in terms of coordinates on the `celestial sphere' intersecting the future light-cone at asymptotic distances. We find that colour-dipole contributions to the infrared operator, to all orders in perturbation theory, have a remarkably simple expression in these coordinates, with scale and coupling dependence factorised from kinematics and colour. Generalising earlier suggestions in the abelian theory, we then show that the infrared operator can be computed as a correlator of vertex operators in a conformal field theory of Lie-algebra-valued free bosons on the celestial sphere. We verify by means of the OPE that the theory correctly predicts the all-order structure of collinear limits, and the tree-level factorisation of soft real radiation.
description: 23 pages, no figures
Remote preparation for single-photon state in two degrees of freedom with hyper-entangled states
Creators: name: Wang, Meiyu
name: Yan, Fengli
name: Gao, Ting
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Remote state preparation (RSP) provides a useful way of transferring quantum information between two distant nodes based on the previously shared entanglement. In this paper, we study RSP of an arbitrary single-photon state in two degrees of freedom (DoFs). Using hyper-entanglement as a shared resource, our first goal is to remotely prepare the single-photon state in polarization and frequency DoFs and the second one is to reconstruct the single-photon state in polarization and time-bin DoFs. In the RSP process, the sender will rotate the quantum state in each DoF of the photon according to the knowledge of the state to be communicated. By performing a projective measurement on the polarization of the sender's photon, the original single-photon state in two DoFs can be remotely reconstructed at the receiver's quantum systems. This work demonstrates a novel capability for long-distance quantum communication.
description: 9 pages, 2 figures
Zur Entwicklung der Arbeitgeberverbände im Ruhrbergbau 1889 - 1914: Streikversicherung und Arbeitsmarktkontrolle
Creators: name: Przigoda, Stefan
Publisher: name: Moving the Social
Year: 2014

description: This is the contribution "Zur Entwicklung der Arbeitgeberverbände im Ruhrbergbau 1889 - 1914: Streikversicherung und Arbeitsmarktkontrolle" of MTS 18 (1997).
description: Moving the Social, Vol 18 (1997): Kolloquium für Hans Mommsen: Freiheit und Sozialismus. Arbeiterbewegung und Menschenrechte in Deutschland im 19./20. Jhd
Menschenrechte und Gewerkschaftsbewegung in Deutschland: Vortrag am 5.7.1996
Creators: name: Schulte, Dieter
Publisher: name: Moving the Social
Year: 2014

description: This is the contribution "Menschenrechte und Gewerkschaftsbewegung in Deutschland: Vortrag am 5.7.1996" of MTS 18 (1997).
description: Moving the Social, Vol 18 (1997): Kolloquium für Hans Mommsen: Freiheit und Sozialismus. Arbeiterbewegung und Menschenrechte in Deutschland im 19./20. Jhd