cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A study of numerical errors in simulations of the cosmic microwave background polarization
Creators: name: Chen, Bell I. L.
Publisher: name: University of British Columbia
Year: 2009

description: There have been numerous studies of data analysis issues involving temperature anisotropics on the microwave sky, but far less attention paid to the polarization signals. The production of maps and their reduction to power spectra proceeds by choosing a particular way of dividing the sphere into pixels. The Equidistant Cylindrical Projection (ECP) is the geometrically simplest pixelization scheme and might have been sufficient in the early days of Cosmology, when the uncertainties from numerical calculations were ususally overshadowed by experimental errors. But with future satellite missions (MAP and Planck) on the horizon, we need to make sure that the pixelization scheme we choose does not add to the small experimental errors, in order to determine the cosmological parameters as accurately as possible. Numerical errors are a small part of the whole polarization data analysis process but one that is easily dealt with in comparison to other more complicated analyses of polarization. In this thesis, we begin by stating a consistent set of equations for calculating the CMB polarization sky and power spectrum. This will be implemented into an ECP scheme, which allows us to study the numerical errors introduced by various effetcs related to pixelization. We will show that all these errors can be optimally reduced by numerical techniques. And finally, we will apply these techniques to a HEALPix pixelization scheme to obtain the most accurate polarization power spectra.
Ruh, Hans, Sozialethischer Auftrag und Gestalt der Kirche
Creators: name: Pioch, Ernst-Erwin
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 21 Nr. 1 (1972): Ökumenische Rundschau, Band 21, Heft 1
Amorphous topological phases protected by continuous rotation symmetry
Creators: name: Spring, Helene
name: Akhmerov, Anton R.
name: Varjas, Daniel
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: Protection of topological surface states by reflection symmetry breaks down when the boundary of the sample is misaligned with one of the high symmetry planes of the crystal. We demonstrate that this limitation is removed in amorphous topological materials, where the Hamiltonian is invariant on average under reflection over any axis due to continuous rotation symmetry. While the local disorder caused by the amorphous structure weakens the topological protection, we demonstrate that the edge remains protected from localization. In order to classify such phases we perform a systematic search over all the possible symmetry classes in two dimensions and construct the example models realizing each of the proposed topological phases. Finally, we compute the topological invariant of these phases as an integral along a meridian of the spherical Brillouin zone of an amorphous Hamiltonian.
description: 15 pages, 10 figures
Towards a working model for the abundance variations within Globular Clusters stars
Creators: name: Ventura, Paolo
name: D'Antona, Francesca
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A popular self--enrichment scenario for the formation of globular clusters assumes that the abundance anomalies shown by the stars in many clusters are due to a second stage of star formation occurring from the matter lost by the winds of massive asymptotic giant branch (AGB) stars. Until today, the modellizations of the AGB evolution by several different groups failed, for different reasons, to account for the patterns of chemical anomalies. Here we show that our own modelling can provide a consistent picture if we constrain the three main parameters which regulate AGB evolution: 1) adopting a high efficiency convection model; 2) adopting rates of mass loss with a high dependence on the stellar luminosity; 3) assuming a very small overshooting below the formal convective regions during the thermal pulse (TP) phase. The first assumption is needed to obtain an efficient oxygen depletion in the AGB envelopes, and the second one is needed to lose the whole stellar envelope within few thermal pulses, so that the sum of CNO elements does not increase too much, consistently with the observations. The third assumption is needed to fully understand the sodium production. We also show that the Mg - Al anticorrelation is explained adopting the higher limit of the NACRE rates for proton captures by Mg25 and Mg26, and the models are consistent with the recently discovered F-Al correlation. Problems remain to fully explain the observed Mg isotopes ratios.
A note on Jacobians of quasiplatonic Riemann surfaces with complex multiplication
Creators: name: Reyes-Carocca, Sebastián
Publisher: name: arXiv
Year: 2020
Subjects: subject: Algebraic Geometry (math.AG)
subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11G15, 11G10, 14K22, 14H37

description: Let $m \geqslant 6$ be an even integer. In this short note we prove that the Jacobian variety of a quasiplatonic Riemann surface with associated group of automorphisms isomorphic to $C_2^2 \rtimes_2 C_m$ admits complex multiplication. We then extend this result to provide a criterion under which the Jacobian variety of a quasiplatonic Riemann surface admits complex multiplication.
description: 6 pages, A typo is corrected. To appear in Geometriae Dedicata
Experience with Market-Based Environmental Policy Instruments
Creators: name: Stavins, Robert N.
name: Stavins, Robert N.
Publisher: name: Unknown
Year: 2001
Subjects: subject: Environmental Economics and Policy
subject: market-based policy
subject: economic incentives
subject: tradable permits
subject: emission taxes

description: Environmental policies typically combine the identification of a goal with some means to achieve that goal. This chapter for the forthcoming Handbook of Environmental Economics focuses exclusively on the second component, the means - the "instruments" - of environmental policy, and considers, in particular, experience around the world with the relatively new breed of economic-incentive or market-based policy instruments. I define these instruments broadly, and consider them within four categories: charge systems; tradable permits; market friction reductions; and government subsidy reductions. Within charge systems, I consider: effluent charges, deposit-refund systems, user charges, insurance premium taxes, sales taxes, administrative charges, and tax differentiation. Within tradeable permit systems, I consider both credit programs and cap-and-trade systems. Under the heading of reducing market frictions, I examine: market creation, liability rules, and information programs. Finally, under reducing government subsidies, I review a number of specific examples from around the world. By defining market-based instruments broadly, I cast a large net for this review of applications. As a consequence, the review is extensive. But this should not leave the impression that market-based instruments have replaced, or have come anywhere close to replacing, the conventional, command-and-control approach to environmental protection. Further, even where these approaches have been used in their purest form and with some success, such as in the case of tradeable-permit systems in the United States, they have not always performed as anticipated. In the final part of the paper, I ask what lessons can be learned from our experiences. In particular, I consider normative lessons for: design and implementation; analysis of prospective and adopted systems; and identification of new applications.
A Critical Analysis of the Mean-Field Approximation for the Calculation of the Magnetic Moment in the Friedel-Anderson Impurity Model
Creators: name: Bergmann, Gerd
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: It is shown that the calculation of the magnetic moment of a Friedel-Anderson impurity in mean-field theory is unreliable. A class of approximate solutions, which contains the mean-field solution as an element, is expressed in rotated Hilbert space and optimized. The optimal state has considerably lower energy than the mean field solution and requires almost twice the Coulomb exchange U to become magnetic. Since most moment calculations of magnetic impurities, for example the spin-density-functional theory, use the mean-field approximation the resulting magnetic moments have to be critically reexamened.(After publication the reference can be found at "http://physics.usc.edu/~bergmann/") PACS: 75.20.Hr
How Do Economists Really Think About the Environment?
Creators: name: Fullerton, Don
name: Stavins, Robert N.
name: Fullerton, Don
name: Stavins, Robert N.
Publisher: name: Unknown
Year: 1998
Subjects: subject: Environmental Economics and Policy
subject: market failure
subject: economic analysis
subject: efficiency
subject: equity

description: On a topic like the environment, communication among scholars from different disciplines in the natural and social sciences is both important and difficult, but such communication has been far from perfect. Economists themselves may have contributed to some rather fundamental misunderstandings about how economists think about the environment, perhaps through our enthusiasm for market solutions, perhaps by neglecting to make explicit all of the necessary qualifications, and perhaps simply by the use of jargon that has specific meaning only to other economists. In this brief essay, we seek to clarify some of these misunderstandings and thus to improve future interdisciplinary communication. We hope that natural scientists and other non-economists will take economic analysis and prescriptions more seriously when they see tempered enthusiasm, explicit qualifications, and better definitions. Our method is to posit a series of prevalent "myths" regarding how economists think about the natural environment. We then explain how each myth might have originated from statements by economists that were meant to summarize a more qualified analysis. In this way, we hope to explain how economists really do think about the natural environment.
A Nearly Linear-Time PTAS for Explicit Fractional Packing and Covering Linear Programs
Creators: name: Koufogiannakis, Christos
name: Young, Neal E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences
subject: G.1.6
subject: 68W25

description: We give an approximation algorithm for packing and covering linear programs (linear programs with non-negative coefficients). Given a constraint matrix with n non-zeros, r rows, and c columns, the algorithm computes feasible primal and dual solutions whose costs are within a factor of 1+eps of the optimal cost in time O((r+c)log(n)/eps^2 + n).
description: corrected version of FOCS 2007 paper: 10.1109/FOCS.2007.62. Accepted to Algorithmica, 2013
On Quantum Simulation Of Cosmic Inflation
Creators: name: Liu, Junyu
name: Li, Yue-Zhou
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-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: In this paper, we generalize Jordan-Lee-Preskill, an algorithm for simulating flat-space quantum field theories, to 3+1 dimensional inflationary spacetime. The generalized algorithm contains the encoding treatment, the initial state preparation, the inflation process, and the quantum measurement of cosmological observables at late time. The algorithm is helpful for obtaining predictions of cosmic non-Gaussianities, serving as useful benchmark problems for quantum devices, and checking assumptions made about interacting vacuum in the inflationary perturbation theory. Components of our work also include a detailed discussion about the lattice regularization of the cosmic perturbation theory, a detailed discussion about the in-in formalism, a discussion about encoding using the HKLL-type formula that might apply for both dS and AdS spacetimes, a discussion about bounding curvature perturbations, a description of the three-party Trotter simulation algorithm for time-dependent Hamiltonians, a ground state projection algorithm for simulating gapless theories, a discussion about the quantum-extended Church-Turing Thesis, and a discussion about simulating cosmic reheating in quantum devices.
description: 74 pages (sorry), 3 figures. v2,v3: add references, correct typos. v4, v5: add new things, nearly-published version
Coseismic Displacement Leyte (Philippine) Eq 6 July 2017 - snapshot
Creators: name: Wolniewicz, Gosia
Publisher: name: Zenodo
Year: 2021

description: Coseismic displacement retrieved from InSAR data (Sentinel-1) of the 6 July 2017 Mw 6.5 earthquake in Leyte (Philippine). https://en.wikipedia.org/wiki/2017_Leyte_earthquake
description: Research Object in Rohub2020: https://rohub2020-rohub.apps.paas-dev.psnc.pl/api/ros/83a3d62a-0e51-498d-ae16-ac15daefec54/
Functional dynamic spect imaging using a single slow camera rotation
Creators: name: Farncombe, Troy
Publisher: name: University of British Columbia
Year: 2009

description: Dynamic single photon emission computed tomography (SPECT) is a relatively new imaging method that uses radioactive tracers and tomographic data acquisition techniques in order to quantify temporal changes in regional radiotracer concentrations within a patient. This is important as the rate of change in tracer concentration within an organ often can be related to the functional ability of that organ. In this work, a new method is presented that is able to determine these kinetic rates while using a conventional single or multiple detector SPECT camera, and more importantly, a single, slow camera rotation in the data collection process (herein this reconstruction method will be referred to as dSPECT). This reconstruction method is based on the fact that a temporal change in the activity concentration at a given location can be represented by a linear inequality constraint over time. Two iterative reconstruction algorithms, constrained least squares (CLS) and dynamic expectation maximization (dEM), have been tested using this approach with a variety of computer simulations and phantom experiments. In simulations involving a slow dynamic change of activity, results indicate that the dSPECT reconstruction procedure typically produces kinetic parameter estimates with a 7% error when using projection data acquired with a single 180° rotation of a triple headed SPECT camera system. This error increases to about 15% for data acquired with a dual head system and further increases to about 50% for single detector acquisitions. When simulated with faster dynamic parameters, errors increased slightly to about 8%, 12% and 55% for acquisitions involving triple, dual and single head systems respectively.
Journal Article
Creators: name: Grant, Sean
name: Golfen, Joe
name: Steinka-Fry, Katarzyna
name: Chinn, Lisa K
name: Tanner-Smith, Emily
name: Schweer-Collins, Maria
name: Day, Elizabeth
name: Trevino, Shaina
Publisher: name: OSF
Year: 2023
Subjects: 4DSW
four-day school week
scoping review

description: OSF project folder for publication on the 4DSW scoping review. Data Package hosted on GitHub
Subradiance in dilute atomic ensembles: Role of pairs and multiple scattering
Creators: name: Fofanov, Y. A.
name: Sokolov, I. M.
name: Kaiser, R.
name: Guerin, W.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We study numerically the slow (subradiant) decay of the fluorescence of motionless atoms after a weak pulsed excitation. We show that, in the linear-optics regime and for an excitation detuned by several natural linewidths, the slow decay rate can be dominated by close pairs of atoms (dimers) forming superradiant and subradiant states. However, for a large-enough resonant optical depth and at later time, the dynamics is dominated by collective many-body effects. In this regime, we study the polarization and the spectrum of the emitted light, as well as the spatial distribution of excitation inside the sample, as a function of time during the decay dynamics. The behavior of these observables is consistent with what would be expected for radiation trapping of nearly resonant light. This finding sheds light on subradiance in dilute samples by providing an interpretation based on the light behavior of the system (multiple scattering) which is complementary to the more commonly used picture of the collective atomic Dicke state.
Reduction of Statistical Power Per Event Due to Upper Lifetime Cuts in Lifetime Measurements
Creators: name: Rademacker, Jonas
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: A cut on the maximum lifetime in a lifetime fit not only reduces the number of events, but also, in some circumstances dramatically, decreases the statistical significance of each event. The upper impact parameter cut in the hadronic B trigger at CDF, which is due to technical limitations, has the same effect. In this note we describe and quantify the consequences of such a cut on lifetime measurements. We find that even moderate upper lifetime cuts, leaving event numbers nearly unchanged, can dramatically increase the statistical uncertainty of the fit result.
description: Changes to latest revision: added DOI link, took the opportunity to correct some minor typos added one small clarification
Guidance for Cardiopulmonary Resuscitation of Children With Suspected or Confirmed COVID-19.
Creators: name: Sasson, Comilla
name: Roberts, Kathryn
name: Chiotos, Kathleen
name: Terry, Mark
name: Levy, Arielle
name: Aziz, Khalid
name: Topjian, Alexis
name: McBride, Mary E
name: Sutton, Robert M
name: Walsh, Brian
name: Bhanji, Farhan
name: Lehotzky, Rebecca E
name: Nadkarni, Vinay
name: Raymond, Tia
name: Duff, Jonathan P
name: Kleinman, Monica
name: Hsu, Antony
name: Joyner, Benny L
name: de Caen, Allan
name: Lasa, Javier J
name: Cheng, Adam
name: Lee, Henry C
name: Meckler, Garth
name: Schexnayder, Stephen M
name: Zelop, Carolyn M
name: Chan, Melissa
name: Morgan, Ryan W
name: Atkins, Dianne L
name: Kamath-Rayne, Beena D
name: Fuchs, Susan
name: Berg, Robert A
Publisher: name: American Academy of Pediatrics (AAP)
Year: 2022

description:
This article aims to provide guidance to health care workers for the provision of basic and advanced life support to children and neonates with suspected or confirmed coronavirus disease 2019 (COVID-19). It aligns with the 2020 American Heart Association Guidelines for Cardiopulmonary Resuscitation (CPR) and Emergency Cardiovascular care while providing strategies for reducing risk of transmission of severe acute respiratory syndrome coronavirus 2 to health care providers. Patients with suspected or confirmed COVID-19 and cardiac arrest should receive chest compressions and defibrillation, when indicated, as soon as possible. Because of the importance of ventilation during pediatric and neonatal resuscitation, oxygenation and ventilation should be prioritized. All CPR events should therefore be considered aerosol-generating procedures. Thus, personal protective equipment (PPE) appropriate for aerosol-generating procedures (including N95 respirators or an equivalent) should be donned before resuscitation, and high-efficiency particulate air filters should be used. Any personnel without appropriate PPE should be immediately excused by providers wearing appropriate PPE. Neonatal resuscitation guidance is unchanged from standard algorithms, except for specific attention to infection prevention and control. In summary, health care personnel should continue to reduce the risk of severe acute respiratory syndrome coronavirus 2 transmission through vaccination and use of appropriate PPE during pediatric resuscitations. Health care organizations should ensure the availability and appropriate use of PPE. Because delays or withheld CPR increases the risk to patients for poor clinical outcomes, children and neonates with suspected or confirmed COVID-19 should receive prompt, high-quality CPR in accordance with evidence-based guidelines.
Quantum Darwinism in a structured spin environment
Creators: name: Ryan, Eoghan
name: Paternostro, Mauro
name: Campbell, Steve
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We examine the emergence and suppression of signatures of quantum Darwinism when the system of interest interacts with a complex, structured environment. We introduce an extended spin-star model where the system is coupled to $N$ independent spin-chains. Each site of the chain then lives in a definite layer of the environment, and hence we term this the "onion" model. We fix the system-environment interaction such that classical objectivity is guaranteed if the environment consists of a single layer. Considering a fully factorized initial state for all constituent sub-systems, we then examine how the emergence and proliferation of signatures of quantum Darwinism are delicately dependent on the chain interaction, establishing that when the chains are considered as indivisible fragments to be interrogated, characteristic redundancy plateaux are always observed at least transiently. In contrast, observing a redundant encoding in a specific layer is highly sensitive to the nature of the interaction. Finally, we consider the case in which each chain is initialized in the ground state of the interaction Hamiltonian, establishing that this case shares the qualitative features of the factorized initial state case, however now the strength of the applied magnetic field has a significant impact on whether quantum Darwinism can be observed. We demonstrate that the presence or absence of quantum Darwinistic features can be understood by analysing the correlations within a layer using total mutual information and global quantum discord.
description: 8 pages, 5 figures. Close to published version
Revisiting transverse momentum broadening in dense QCD media
Creators: name: Barata, Joao
name: Mehtar-Tani, Yacine
name: Soto-Ontoso, Alba
name: Tywoniuk, Konrad
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We reconsider the problem of transverse momentum broadening of a highly-energetic parton suffering multiple scatterings in dense colored media, such as the thermal Quark-Gluon plasma or large nuclei. In the framework of Molière's theory of multiple scattering we re-derive a simple analytic formula, to be used in jet quenching phenomenology, that accounts for both the multiple soft and hard Rutherford scattering regimes. Further, we discuss the sensitivity of momentum broadening to modeling of the non-perturbative infrared sector by presenting a detailed analytic and numerical comparison between the two widely used models in phenomenology: the Hard Thermal Loop and the Gyulassy-Wang potentials. We show that for the relevant values of the parameters the non-universal, model dependent contributions are negligible, at LHC, RHIC and EIC energies thus consolidating the predictive power of jet quenching theory.
description: Fixed typos from previous version. Main results unchanged; figures were updated. Matches published version
[Brev til Johan Ernst Gunnerus]
Creators: name: Glahn, Henrik Christopher
name: Gunnerus, Johan Ernst
Publisher: name: Unknown
Year: 1770

description: Glahn oversender en avhandling om "Grønlændernes skikke til Hvalfiskeriet".
description: Dahl nr.: 743. Polydoc nr. 1: 441. Polydoc nr. 2: 89.
Tiling by translates of a function: results and open problems
Creators: name: Kolountzakis, Mihail N.
name: Lev, Nir
Publisher: name: arXiv
Year: 2020
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Functional Analysis (math.FA)
subject: Metric Geometry (math.MG)
subject: FOS: Mathematics
subject: 42A38, 52C23, 52C25

description: We say that a function $f \in L^1(\mathbb{R})$ tiles at level $w$ by a discrete translation set $Λ\subset \mathbb{R}$, if we have $\sum_{λ\in Λ} f(x-λ)=w$ a.e. In this paper we survey the main results, and prove several new ones, on the structure of tilings of $\mathbb{R}$ by translates of a function. The phenomena discussed include tilings of bounded and of unbounded density, uniform distribution of the translates, periodic and non-periodic tilings, and tilings at level zero. Fourier analysis plays an important role in the proofs. Some open problems are also given.
Finite-Energy Spectral-Weight Distributions of a 1D Correlated Metal
Creators: name: Carmelo, J. M. P.
name: Penc, K.
name: Bozi, D.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We derive general closed-form analytical expressions for the finite-energy one- and two-electron spectral-weight distributions of an one-dimensional correlated metal with on-site electronic repulsion. Our results also provide general expressions for the one- and two-atom spectral functions of a correlated quantum system of cold fermionic atoms in a one-dimensional optical lattice with on-site atomic repulsion. In the limit of zero spin density our spectral-function expressions provide the correct zero-spin density results. Our results reveal the dominant non-perturbative microscopic many-particle mechanisms behind the exotic spectral properties observed in quasi-one-dimensional metals and correlated systems of cold fermionic atoms in one-dimensional optical lattices.
description: 30 pages, no figures
[Brev til Johan Ernst Gunnerus]
Creators: name: Richelieu, Johan Christopher
name: Gunnerus, Johan Ernst
Publisher: name: Unknown
Year: 1770

description: R. oversender tre kart (Aure og Smøla prestegjeld, et kart over Stangvik og et over Kristiansund) samt generalkart over Nordmøre prosti
description: Dahl nr.: 745. Polydoc nr. 1: 442. Polydoc nr. 2: 90.
Mechanical Power Made Simple: Validating a Simplified Calculation of Mechanical Power in Preterm Lungs: ARRIVE Statement
Creators: name: TINGAY, DAVID
name: Sett, Arun
name: Sett, Arun
name: Pereira-Fantini, Prue
Publisher: name: The University of Melbourne
Year: 2024
Subjects: classificationCode: 320803
subject: Systems physiology
classificationCode: 320212
subject: Intensive care
classificationCode: 321303
subject: Neonatology

description: ARRIVE Statement for manuscript entitled Mechanical Power Made Simple: Validating a Simplified Calculation of Mechanical Power in Preterm Lungs
[Brev til Johan Ernst Gunnerus]
Creators: name: Tilas, Daniel
name: Gunnerus, Johan Ernst
Publisher: name: Unknown
Year: 1770

description: Tilas kommenterer Schønings omtale av Meldal kobberverk samt Trondheims domkirke
description: Dahl nr.: 747. Polydoc nr. 1: 443. Polydoc nr. 2: 91.
The role of five-quark components in gamma decay of the $Δ(1232)$
Creators: name: Li, Q. B.
name: Riska, D. O.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: An admixture of 10-20 % of qqqq\bar q components in the Delta(1232) resonance is shown to reduce the well known underprediction for the decay width for Delta(1232)->N gamma decay by about half and that of the corresponding helicity amplitudes from a factor ~ 1.7 to ~ 1.5. The main effect is due to the quark-antiquark annihilation transitions qqqq\bar q -> qqq gamma, the consideration of which brings the ratio A_{3/2}/A_{1/2} and consequently the E2/M1 ratio R_{EM} into agreement with the empirical value. Transitions between qqqq\bar q components in the resonance and the nucleon qqqq\bar q->qqqq\bar q gamma are shown to enhance the calculated width by only a few percent, as long as the probability of the qqqq\bar q component of the Delta(1232) and the proton is at most ~ 20 %. The transitions qqqq\bar q->qqqq\bar q gamma between the qqqq\bar q components in the Delta(1232) and the proton do not lead to a nonzero value for R_{EM}.
Online Teaching Practice under the Epidemic Situation of Novel Coronavirus Pneumonia
Creators: name: LIU Liwen
name: CHEN Xiquan
name: LI Xiaoyun
name: ZENG Yan
name: ZHANG Chunying
name: LIU Liwen
name: CHEN Xiquan
name: LI Xiaoyun
name: ZENG Yan
name: ZHANG Chunying
Publisher: name: Unknown
Year: 2021
Subjects: subject: Agribusiness
subject: Online classroom
subject: Flipped classroom
subject: Mind mapping
subject: Epidemic situation
subject: Teaching practice

description: In the context of preventing and controlling novel coronavirus pnevmonia,how to ensure the quality of higher education has become a hot issue of social concern in China. In this article, the problems and challenges are analyzed from teacher,student and technology levels,the teaching pattern of "re-flipped classroom"and the teaching model of "SPOC+ MOOC+live broadcast"are proposed,the three teaching methods of PBL,OBE and mind mapping are integrated,the teaching evaluation is introduced to teaching design,and finally,the implementationg suggestions are put forward to ensure the quality of teaching.
Universal gravitational-wave signatures from heavy new physics in the electroweak sector
Creators: name: Eichhorn, Astrid
name: Lumma, Johannes
name: Pawlowski, Jan M.
name: Reichert, Manuel
name: Yamada, Masatoshi
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We calculate the gravitational-wave spectra produced by the electroweak phase transition with TeV-scale Beyond-Standard-Model physics in the early universe. Our study captures the effect of quantum and thermal fluctuations within a non-perturbative framework. We discover a universal relation between the mean bubble separation and the strength parameter of the phase transition, which holds for a wide range of new-physics contributions. The ramifications of this result are three-fold: First, they constrain the gravitational-wave spectra resulting from heavy (TeV-scale) new physics. Second, they contribute to distinguishing heavy from light new physics directly from the gravitational-wave signature. Third, they suggest that a concerted effort of gravitational-wave observations together with collider experiments could be required to distinguish between different models of heavy new physics.
description: 46 pages, 11 figures, 3 tables; JCAP version
BILDUNG NЕUЕR WÖRTЕR VОN WОRTSTÄMMЕN UND MОTIVIЕRTHЕIT IN DЕR DЕUTSCHЕN SРRАCHЕ
Creators: name: Nurnazarov, Ernazar
Publisher: name: Zenodo
Year: 2024

description: Dieser Artikel wurde über neue Wörter im Deutschen und die Fragen der Motivationsbildung erzählt.
Hilbert's Program Then and Now
Creators: name: Zach, Richard
Publisher: name: arXiv
Year: 2005
Subjects: subject: Logic (math.LO)
subject: History and Overview (math.HO)
subject: FOS: Mathematics
subject: 03A05, 00A30, 01A60

description: Hilbert's program was an ambitious and wide-ranging project in the philosophy and foundations of mathematics. In order to "dispose of the foundational questions in mathematics once and for all, "Hilbert proposed a two-pronged approach in 1921: first, classical mathematics should be formalized in axiomatic systems; second, using only restricted, "finitary" means, one should give proofs of the consistency of these axiomatic systems. Although Godel's incompleteness theorems show that the program as originally conceived cannot be carried out, it had many partial successes, and generated important advances in logical theory and meta-theory, both at the time and since. The article discusses the historical background and development of Hilbert's program, its philosophical underpinnings and consequences, and its subsequent development and influences since the 1930s.
description: 43 pages
Inhomogeneous dusty Universes and their deceleration
Creators: name: Giovannini, Massimo
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Exact results stemming directly from Einstein equations imply that inhomogeneous Universes endowed with vanishing pressure density can only decelerate, unless the energy density of the Universe becomes negative. Recent proposals seem to argue that inhomogeneous (but isotropic) space-times, filled only with incoherent matter,may turn into accelerated Universes for sufficiently late times. To scrutinize these scenarios, fully inhomogeneous Einstein equations are discussed in the synchronous system. In a dust-dominated Universe, the inhomogeneous generalization of the deceleration parameter is always positive semi-definite implying that no acceleration takes place.
description: 8 pages; minor corrected typos
Predicting the Dimits shift through reduced mode tertiary instability analysis in a strongly driven gyrokinetic fluid limit
Creators: name: Hallenbert, A.
name: Plunk, G. G.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The tertiary instability is believed to be important for governing magnetised plasma turbulence under conditions of strong zonal flow generation, near marginal stability. In this work, we investigate its role for a collisionless strongly driven fluid model, self-consistently derived as a limit of gyrokinetics. It is found that a region of absolute stability above the linear threshold exists, beyond which significant nonlinear transport rapidly develops. While within this range a complex pattern of transient zonal evolution is observed before a stable profile is found, the Dimits transition itself is found to coincide with a tertiary instability threshold so long as linear effects are included. Through a simple and readily extendable procedure tracing its origin to St-Onge 2017 (arXiv:1704.05406) the stabilising effect of the typical zonal profile can be approximated and the accompanying reduced mode estimate is found to be in good agreement with nonlinear simulations.
description: 30 pages, 9 figures; improved the derivation of Appendix A, slightly modified several statements for accuracy, updated figures and notation
[Brev til Johan Ernst Gunnerus]
Creators: name: Walch, Johann Ernst Immanuel
name: Gunnerus, Johan Ernst
Publisher: name: Unknown
Year: 1771

description: Walch skriver bl.a. om sina naturaliesamlinger
description: Dahl nr.: 757. Polydoc nr. 1: 447. Polydoc nr. 2: 95.
Extensions of Lie-Rinehart algebras and cotangent bundle reduction
Creators: name: Huebschmann, Johannes
name: Perlmutter, Matthew
name: Ratiu, Tudor S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Symplectic Geometry (math.SG)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53D20, 17B63, 17B65, 17B66, 17B81, 22E70, 53D17, 81S10

description: Let Q denote a smooth manifold acted upon smoothly by a Lie group G. The G-action lifts to an action on the total space T of the cotangent bundle of Q and hence on the standard symplectic Poisson algebra of smooth functions on T. The Poisson algebra of G-invariant functions on T yields a Poisson structure on the space T/G of G-orbits. We relate this Poisson algebra with extensions of Lie-Rinehart algebras and derive an explicit formula for this Poisson structure in terms of differentials. We then show, for the particular case where the G-action on Q is principal, how an explicit description of the Poisson algebra derived in the literature by an ad hoc construction is essentially a special case of the formula for the corresponding extension of Lie-Rinehart algebras. By means of various examples, we also show that this kind of description breaks down when the G-action does not define a principal bundle.
description: The original version has been reworked and expanded with coauthors. The new version has 30 pages; it will appear in the Proceedings of the London Mathematical Society
On supersymmetric AdS$_3$ solutions of Type II
Creators: name: Passias, Achilleas
name: Prins, Daniël
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We classify supersymmetric warped AdS$_3 \times_w M_7$ backgrounds of Type IIA and Type IIB supergravity with non-constant dilaton, generic RR fluxes and magnetic NSNS flux, in terms of a dynamic $SU(3)$-structure on $M_7$. We illustrate our results by recovering several solutions with various amounts of supersymmetry. The dynamic $SU(3)$-structure includes a $G_2$-structure as a limiting case, and we show that in Type IIB this is integrable.
description: 15 pages. v2: additional examples with G2-structure
Bosonic resonating valence bond wave function for doped Mott insulators
Creators: name: Weng, Z. Y.
name: Zhou, Y.
name: Muthukumar, V. N.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We propose a new class of ground states for doped Mott insulators in the electron second-quantization representation. They are obtained from a bosonic resonating valence bond (RVB) theory of the t-J model. At half filling, the ground state describes spin correlations of the S=1/2 Heisenberg model very accurately. Its spin degrees of freedom are characterized by RVB pairing of spins, the size of which decreases continuously as holes are doped into the system. Charge degrees of freedom emerge upon doping and are described by twisted holes in the RVB background. We show that the twisted holes exhibit an off diagonal long range order (ODLRO) in the pseudogap ground state, which has a finite pairing amplitude, but is short of phase coherence. Unpaired spins in such a pseudogap ground state behave as free vortices, preventing superconducting phase coherence. The existence of nodal quasiparticles is also ensured by such a hidden ODLRO in the ground state, which is non-Fermi-liquid-like in the absence of superconducting phase coherence. Two distinct types of spin excitations can also be constructed. The superconducting instability of the pseudogap ground state is discussed and a d-wave superconducting ground state is obtained. This class of pseudogap and superconducting ground states unifies antiferromagnetism, pseudogap, superconductivity, and Mott physics into a new state of matter.
description: 28 pages, 5 figures, final version to appear in Phys. Rev. B
MPEC 2024-A117 : 2021 SJ88
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2021 SJ88

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
A Hierarchical Performance Equation Library for Basic Op-Amp Design
Creators: name: Abel, Inga
name: Neuner, Maximilian
name: Graeb, Helmut
Publisher: name: arXiv
Year: 2020
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The paper presents a new approach to automate the set-up of the design equations of the manual analog design process. Its main contribution is a comprehensive hierarchical performance equation library (HPEL) for op-amps. The HPEL makes the set-up of design equations independent of the topology. Based on the library and the functional block recognition method in [1], analytical performance models for various op-amp topologies are automatically instantiated. The method is currently designed for basic op-amps. In this paper, we use the method to size different op-amp topologies. Experimental results featuring four circuits are presented. The HPEL has also been integrated into a structural synthesis method featuring several thousand op-amp topologies [2].
description: (C) 2021 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission. See https://www.ieee.org/publications/rights/index.html for more information. This is the author's version which has not been fully edit. Content may change prior to final publication. Citation information: DOI
Phonon Linewidths and Electron Phonon Coupling in Nanotubes
Creators: name: Lazzeri, Michele
name: Piscanec, S.
name: Mauri, Francesco
name: Ferrari, A. C.
name: Robertson, J.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We prove that Electron-phonon coupling (EPC) is the major source of broadening for the Raman G and G- peaks in graphite and metallic nanotubes. This allows us to directly measure the optical-phonon EPCs from the G and G- linewidths. The experimental EPCs compare extremely well with those from density functional theory. We show that the EPC explains the difference in the Raman spectra of metallic and semiconducting nanotubes and their dependence on tube diameter. We dismiss the common assignment of the G- peak in metallic nanotubes to a Fano resonance between phonons and plasmons. We assign the G+ and G- peaks to TO (tangential) and LO (axial) modes.
description: 5 pages, 4 figures (correction in label of fig 3)
Quotients of functors of Artin rings
Creators: name: Dokchitser, Tim
Publisher: name: arXiv
Year: 2005
Subjects: subject: Algebraic Geometry (math.AG)
subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics
subject: 14L30, 18A32

description: In infinitesimal deformation theory, a classical criterion due to Schlessinger gives an intrinsic characterisation of functors that are pro-representable, and more generally, of the ones that have a hull. Our result is that in this setting the question of characterising group quotients can also be answered. In other words, for functors of Artin rings that have a hull, those that are quotients of pro-representable ones by a constant group action can be described intrinsically.
description: 4 pages
Observation of forward neutron multiplicity dependence of dimuon acoplanarity in ultraperipheral Pb-Pb collisions at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV
Creators: name: CMS Collaboration
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The first measurement of the dependence of $γγ$ $\to$ $μ^{+}μ^{-}$ production on the multiplicity of neutrons emitted very close to the beam direction in ultraperipheral heavy ion collisions is reported. Data for lead-lead interactions at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV, with an integrated luminosity of approximately 1.5 nb$^{-1}$, were collected using the CMS detector at the LHC. The azimuthal correlations between the two muons in the invariant mass region 8 $\lt$ $m_{μμ}$ $\lt$ 60 GeV are extracted for events including 0, 1, or at least 2 neutrons detected in the forward pseudorapidity range $|η|$ $\gt$ 8.3. The back-to-back correlation structure from leading-order photon-photon scattering is found to be significantly broader for events with a larger number of emitted neutrons from each nucleus, corresponding to interactions with a smaller impact parameter. This observation provides a data-driven demonstration that the average transverse momentum of photons emitted from relativistic heavy ions has an impact parameter dependence. These results provide new constraints on models of photon-induced interactions in ultraperipheral collisions. They also provide a baseline to search for possible final-state effects on lepton pairs caused by traversing a quark-gluon plasma produced in hadronic heavy ion collisions.
description: Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-19-014 (CMS Public Pages)
Profiles of near-resonant population-imbalanced trapped Fermi gases
Creators: name: De Silva, Theja N.
name: Mueller, Erich J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We investigate the density profiles of a partially polarized trapped Fermi gas in the BCS-BEC crossover region using mean field theory within the local density approximation. Within this approximation the gas is phase separated into concentric shells. We describe how the structure of these shells depends upon the polarization and the interaction strength. A Comparison with experiments yields insight into the possibility of a polarized superfluid phase.
description: 4 pages, 5 Figures, Published version
[Brev til Johan Ernst Gunnerus]
Creators: name: Montin, Lars
name: Gunnerus, Johan Ernst
Publisher: name: Unknown
Year: 1771

description: Montin oversender et skrift om "de Anmærkningar som jag førledit År gjorde vid Nya Kåpp-ympsættet"
description: Dahl nr.: 771. Se: VS skrifter V p. 159, bl.a. Polydoc nr. 1: 450. Polydoc nr. 2: 98.
Minimizing Pumping Energy Cost in Real-time Operations of Water Distribution Systems using Economic Model Predictive Control
Creators: name: Wang, Ye
name: Yok, Kevin Too
name: Wu, Wenyan
name: Simpson, Angus R.
name: Weyer, Erik
name: Manzie, Chris
Publisher: name: arXiv
Year: 2020
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Optimizing pump operations is a challenging task for real-time management of water distribution systems (WDSs). With suitable pump scheduling, pumping costs can be significantly reduced. In this research, a novel economic model predictive control (EMPC) framework for real-time management of WDSs is proposed. Optimal pump operations are selected based on predicted system behavior over a receding time horizon with the aim to minimize the total pumping energy cost. Time-varying electricity tariffs are considered while all the required water demands are satisfied. The novelty of this framework is to choose the number of pumps to operate in each pump station as decision variables in order to optimize the total pumping energy costs. By using integer programming, the proposed EMPC is applied to a benchmark case study, the Richmond Pruned network. The simulation with an EPANET hydraulic simulator is implemented. Moreover, a comparison of the results obtained using the proposed EMPC with those obtained using trigger-level control demonstrates significant economic benefits of the proposed EMPC.
[Brev til Johan Ernst Gunnerus]
Creators: name: Hennings, Justus Christian
name: Gunnerus, Johan Ernst
Publisher: name: Unknown
Year: 1772

description: Hennings oversender et arbeid av Walch og kommenterer div. andre verker
description: Dahl nr.: 777. Polydoc nr. 1: 452. Polydoc nr. 2: 100.
[Brev til Johan Ernst Gunnerus]
Creators: name: Montin, Lars
name: Gunnerus, Johan Ernst
Publisher: name: Unknown
Year: 1772

description: Takker for Gunnerus velvillige behandling av hans "Afhandling"
description: Dahl nr.: 779. Polydoc nr. 1: 453. Polydoc nr. 2: 101.