cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Gaia 20eae: A newly discovered episodically accreting young star
Creators: name: Ghosh, Arpan
name: Sharma, Saurabh
name: Ninan, Joe. P.
name: Ojha, Devendra K.
name: Bhatt, Bhuwan C.
name: Kanodia, Shubham
name: Mahadevan, Suvrath
name: Stefansson, Gudmundur
name: Yadav, R. K.
name: Gour, A. S.
name: Pandey, Rakesh
name: Sinha, Tirthendu
name: Panwar, Neelam
name: Wisniewski, John P.
name: Canas, Caleb I.
name: Lin, Andrea S. J.
name: Roy, Arpita
name: Hearty, Fred
name: Ramsey, Lawrence
name: Robertson, Paul
name: Schwab, Christian
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The Gaia Alert System issued an alert on 2020 August 28, on Gaia 20eae when its light curve showed a $\sim$4.25 magnitude outburst. We present multi-wavelength photometric and spectroscopic follow-up observations of this source since 2020 August and identify it as the newest member of the FUor/EXor family of sources. We find that the present brightening of Gaia 20eae is not due to the dust clearing event but due to an intrinsic change in the spectral energy distribution. The light curve of Gaia 20eae shows a transition stage during which most of its brightness ($\sim$3.4 mag) has occurred at a short timescale of 34 days with a rise-rate of 3 mag/month. Gaia 20eae has now started to decay at a rate of 0.3 mag/month. We have detected a strong P Cygni profile in H$α$ which indicates the presence of winds originating from regions close to the accretion. We find signatures of very strong and turbulent outflow and accretion in Gaia 20eae during this outburst phase. We have also detected a red-shifted absorption component in all the Ca II IR triplet lines consistent with signature of hot in-falling gas in the magnetospheric accretion funnel. This enables us to constrain the viewing angle with respect to the accretion funnel. Our investigation of Gaia 20eae points towards magnetospheric accretion being the phenomenon for the current outburst.
description: 17 pages, 11 figures, Accepted in Astrophysical Journal
Pomeron structure functions from HERA to Tevatron and LHC
Creators: name: Royon, C.
name: Schoeffel, L.
name: Peschanski, R.
name: Sauvan, E.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The proton diffractive structure function $F_2^{D(3)}$ measured in the H1 and ZEUS experiments at HERA are analysed in terms of perturbative QCD in the perspective of the QCD extrapolation to the Tevatron and the LHC. It is shown that both data sets can be well described by a QCD analysis in which point-like parton distributions, evolving according to the next-leading DGLAP equations, are assigned to the leading and sub-leading Regge exchanges. For present data from H1 and ZEUS the gluon distributions are found to be quite different and we give the corresponding sets of quark and gluon parton distributions for the Pomeron, extracted from the two experiments. An extrapolation to the Tevatron range is compared with CDF data on single diffraction. Conclusions on factorization breaking between HERA and Tevatron critically depend on whether H1 (strong violation) or ZEUS (compatibility at low $β$) fits are taken into account. Using the double Pomeron formulation in central diffractive dijet production we show that the Tevatron mass fraction is much sensitive to the high $β$ tail of the gluon in the Pomeron, suggesting a new way of handling the otherwise badly known gluon distribution in the Pomeron. Extrapolation of the fits to very high $Q^2$ are given since they will be relevant for QCD and diffraction studies at the LHC.
description: 13 pages, 8 figures
Materials for Mutsun Text Collection
Creators: name: Butler, Lynnika
name: Geary, Quirina
name: Warner, Natasha
name: Van Volkinburg, Heather
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022

description: Includes PDFs corresponding to individual chapters of Mutsun Text Collection (Warner et al. 2022), XML exports of underlying FieldWorks Language Explorer (FLEx) database (by chapter), and FLEx backup files of the entire underlying database. Each type of file has public- and community-oriented versions; the latter are restricted to use by community members. In addition to the associated materials cited here (the single public-oriented PDF, published as a Survey Report), there is also a single community-oriented PDF document with additional content (2022-11.003).
A blockchain-based pattern for confidential and pseudo-anonymous contract enforcement
Creators: name: Six, Nicolas
name: Ribalta, Claudia Negri
name: Herbaut, Nicolas
name: Salinesi, Camille
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: Blockchain has been praised for its capacity to hold data in a decentralized and tamper-proof way. It also supports the execution of code through blockchain's smart contracts, adding automation of actions to the network with high trustability. However, as smart contracts are visible by anybody on the network, the business data and logic may be at risk, thus companies could be reluctant to use such technology. This paper aims to propose a pattern that allows the execution of automatable legal contract clauses, where its execution states are stored in an on-chain smart-contract and the logic needed to enforce it wraps it off-chain. An engine completes this pattern by running a business process that corresponds to the legal contract. We then propose a pattern-based solution based on a real-life use case: transportation of refrigerated goods. We argue that this pattern guarantees companies pseudonymity and data confidentiality while ensuring that an audit trail can be reconstituted through the blockchain smart-contract to identify misbehavior or errors. This paper paves the way for a future possible implementation of the solution described, as well as its evaluation.
We're only in it for the money: are incentives enough to compensate poor motivation?
Creators: name: Brunel Valentin
name: Palat Blazej
Publisher: name: Zenodo
Year: 2021

description: There are moments in online panel operation when technical, financial, or
 organisational constraints impose a change in panel functioning rules, resulting in increased
 risk of attrition. On the occasion of panel functioning change in ELIPSS, a French non-
 commercial online panel, we explored information predictive of panel survival when
 membership became less attractive to panellists. Available information was collected at
 different stages of individual participation: recruitment, profiling, and survey response
 behavior (paradata). We also devised an experiment aimed at testing differences in
 effectiveness between three types of incentives on panel survival: repetitive financial
 incentives (two incentives separated by a four-month period), single financial incentive, and
 single financial incentive coupled with a gift. A hierarchical logistic regression model made it
 possible to distinguish indices derived from survey response behavior and from questions
 pertaining to panellists’ initial motivation to join the panel as significant predictors of panel
 survival. Our findings can be useful for panel monitoring in the context of important changes
 in its functioning. They outline that long-lasting attitudes towards panel participation have
 much more impact on panel survival than the amount of incentives received.
Evidence for strong intracluster magnetic fields in the early Universe
Creators: name: Xu, J.
name: Han, J. L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The origin of magnetic fields in clusters of galaxies is still a matter of debate. Observations for intracluster magnetic fields over a wide range of redshifts are crucial to constrain possible scenarios for the origin and evolution of the fields. (Differences of Faraday rotation measures (RMs) of an embedded double radio sources, i.e. a pair of lobes of mostly Fanaroff--Riley type II radio galaxies, are free from the Faraday rotation contributions from the interstellar medium inside the Milky Way and the intergalactic medium between radio galaxies and us, and hence provide a novel way to estimate average magnetic field within galaxy clusters.) We have obtained a sample of 627 pairs whose RMs and redshifts are available in the most updated RM catalogues and redshift databases. The RM differences of the pairs are derived. The statistically large RM differences for pairs of redshifts $z>0.9$ indicate that intracluster magnetic fields is as strong as about 4~$μ$G. Such strong magnetic fields in the intracluster medium at the half age of the Universe, comparable to intracluster field strength in nearby galaxy clusters, pose a challenge on the theories for origin of cosmic magnetic fields.
description: 31 pages, 8 figures. Acccepted by ApJ
Full security of quantum key distribution from no-signaling constraints
Creators: name: Masanes, Ll.
name: Renner, R.
name: Christandl, M.
name: Winter, A.
name: Barrett, J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: Cryptography and Security (cs.CR)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We analyze a cryptographic protocol for generating a distributed secret key from correlations that violate a Bell inequality by a sufficient amount, and prove its security against eavesdroppers, constrained only by the assumption that any information accessible to them must be compatible with the non-signaling principle. The claim holds with respect to the state-of-the-art security definition used in cryptography, known as universally-composable security. The non-signaling assumption only refers to the statistics of measurement outcomes depending on the choices of measurements; hence security is independent of the internal workings of the devices --- they do not even need to follow the laws of quantum theory. This is relevant for practice as a correct and complete modeling of realistic devices is generally impossible. The techniques developed are general and can be applied to other Bell inequality-based protocols. In particular, we provide a scheme for estimating Bell-inequality violations when the samples are not independent and identically distributed.
description: 15 pages, 2 figure
Multi-contrast K-edge imaging on a bench-top photon-counting CT system: Acquisition parameter study
Creators: name: Richtsmeier, Devon
name: Dunning, Chelsea A. S.
name: Iniewski, Kris
name: Bazalova-Carter, Magdalena
Publisher: name: arXiv
Year: 2020
Subjects: subject: Medical Physics (physics.med-ph)
subject: FOS: Physical sciences

description: Purpose: Photon-counting computed tomography (PCCT) shows promise for medical imaging in regards to material separation and imaging of multiple contrast agents. However, many PCCT setups are under development and are not optimized for specific contrast agents or use cases. Here, we demonstrate how experimental system parameters may be varied in order to enhance performance and we propose a set of recommendations to achieve this based on contrast agent. Approach: A table-top PCCT system with a cadmium zinc telluride (CZT) detector capable of separating six energy bins was used to image multiple contrast agents in a small phantom. The contrast agents were separated and the concentration was quantified using K-edge subtraction. To increase system performance, we investigated three parameters: beam filter type and thickness, projection acquisition time, and energy bin width. The results from the parameters were compared based on PCCT signal and contrast to noise ratio (CNR) or noise in K-edge images. The concentrations of the contrast agents were quantified in K-edge images and compared to known concentrations. Results: The bench-top PCCT system was able to successfully quantify the contrast agents through K-edge subtraction. Decreasing projection acquisition time showed a decrease in K-edge CNR. However, it did not scale as the square root of time. Filter type and bin width demonstrated a dependence on the specific contrast agent. Conclusions: The presented bench-top system demonstrated the ability to separate contrast agents using K-edge subtraction and accurately determine contrast concentration in K-edge images. Specific parameters for future use will be chosen based on contrast agent.
description: 16 pages, 8 figures, 1 table, accepted to the Journal of Instrumentation
Dziewas, Ralf / Kißkalt, Michael (Hrsg.): Identität und Wandel
Creators: name: Sarx, Tobias
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 64 Nr. 2 (2015): Ökumenische Rundschau, Band 64, Heft 2
Field theoretical quantities in the fractional quantum Hall effect
Creators: name: Curnoe, Curnoe
Publisher: name: University of British Columbia
Year: 2009

description: This thesis studies two models of the fractional quantum Hall effect (FQHE), the bosonic (Chern-Simons-Landau-Ginzburg) description and the fermionic (composite fermion gauge theory) description. The bosonic theory attempts to describe the FQHE states at filling fractions v = [formula] while the fermionic theory attempts to describe the states at v = [formula] and the metallic states in between. Within the bosonic theory, the fractionally charged quasiparticles of the FQH system are vortices which appear during the breakdown of the uniform quantum Hall state. The energetics of a single vortex state are studied whereby it is shown how the system may become unstable to the formation of vortices. Numerical vortex profiles are computed by minimising the Hamiltonian. Using the fermionic theory of composite fermions interacting with gauge fluctuations, we consider two important field theoretic quantities, the self-energy and the thermodynamic potential in a finite magnetic field. We find that the conventional Luttinger-Ward treatment of the oscillatory behaviour of the thermodynamic potential is not applicable in two dimensions, for any kind of interaction. Instead we propose a new formulation which omits all crossed graphs and which necessarily includes the oscillatory self-consistent self-energy. To second order in perturbation theory, the oscillatory self-energy is calculated by retaining Landau level quantisation on the internal fermion line. The low energy form of the self-consistent self-energy is obtained by means of a new iterative procedure which is introduced here. This procedure makes use of the structure introduced by Landau level quantisation. We also investigate the structure induced in the analogous two dimensional electron-phonon problem, in order to assist our understanding of the composite fermion self-energy. In the low energy limit, it is found that the renormalised form of the composite fermion Green's function is of the same form as the unrenormalised Green's function. Therefore we argue that the principal effects of interactions may be accounted for using a field-dependent renormalised mass. The iterative procedure for finding the self-consistent self-energy is used to evaluate the renormalised gap between the Fermi energy and the first excited states, which rapidly converges in a few iterations. We find a significant departure from the asymptotic result obtained by ignoring Landau level quantisation in the regime of experimentally relevant values of the parameters. We compare our findings with measurements of the gap in fractional Hall states near v = 1 / 2 .
A spectral Galerkin method for the coupled Orr-Sommerfeld and induction equations for free-surface MHD
Creators: name: Giannakis, Dimitrios
name: Fischer, Paul F.
name: Rosner, Robert
Publisher: name: arXiv
Year: 2008
Subjects: subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We develop and test spectral Galerkin schemes to solve the coupled Orr-Sommerfeld (OS) and induction equations for parallel, incompressible MHD in free-surface and fixed-boundary geometries. The schemes' discrete bases consist of Legendre internal shape functions, supplemented with nodal shape functions for the weak imposition of the stress and insulating boundary conditions. The orthogonality properties of the basis polynomials solve the matrix-coefficient growth problem, and eigenvalue-eigenfunction pairs can be computed stably at spectral orders at least as large as p = 3,000 with p-independent roundoff error. Accuracy is limited instead by roundoff sensitivity due to non-normality of the stability operators at large hydrodynamic and/or magnetic Reynolds numbers (Re, Rm > 4E4). In problems with Hartmann velocity and magnetic-field profiles we employ suitable Gauss quadrature rules to evaluate the associated exponentially weighted sesquilinear forms without error. An alternative approach, which involves approximating the forms by means of Legendre-Gauss-Lobatto (LGL) quadrature at the 2p - 1 precision level, is found to yield equal eigenvalues within roundoff error. As a consistency check, we compare modal growth rates to energy growth rates in nonlinear simulations and record relative discrepancy smaller than $ 1E-5 $ for the least stable mode in free-surface flow at Re = 3E4. Moreover, we confirm that the computed normal modes satisfy an energy conservation law for free-surface MHD with error smaller than 1E-6. The critical Reynolds number in free-surface MHD is found to be sensitive to the magnetic Prandtl number Pm, even at the Pm = O(1E-5) regime of liquid metals.
description: 57 pages, 17 figures, submitted to JCP
MPEC 2024-T191 : 2015 MC
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

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.
Letter from F. H. Starr in Calgary, A.B., to James Goldie, March 10 1911
Creators: name: Starr, F.H.
Publisher: name: The University of British Columbia
Year: 2017

description: Letter to James Goldie from F. H. Starr in Calgary, A.B., dated March 10, 1911, regarding payment for transfer of land from Robert W. Mayhew to Goldie.
Emergence of cooperatively reorganizing cluster and super-Arrhenius dynamics of fragile supercooled liquids
Creators: name: Singh, Ankit
name: Bhattacharyya, Sarika Maitra
name: Singh, Yashwant
Publisher: name: arXiv
Year: 2020
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: In this paper we develop a theory to calculate the structural relaxation time τ α of fragile su percooled liquids. Using the information of the configurational entropy and structure we calculate the number of dynamically free, metastable, and stable neighbors around a central particle. In supercooled liquids the cooperatively reorganizing clusters (CRCs) in which the stable neighbors form stable nonchemical bonds with the central particle emerge. For an event of relaxation to take place these bonds have to reorganize irreversibly; the energy involved in the processes is the effective activation energy of relaxation. The theory brings forth a temperature T a and a temper ature dependent parameter ψ(T ) which characterize slowing down of dynamics on cooling. It is shown that the value of ψ(T ) is equal to 1 for T > T a indicating that the underlying microscopic mechanism of relaxation is dominated by the entropy driven processes while for T < T a , ψ(T ) decreases on cooling indicating the emergence of the energy driven processes. This crossover of ψ(T ) from high to low temperatures explains the crossover seen in τ α . The dynamics of systems that may have similar static structure but very different dynamics can be understood in terms of ψ(T ). We present results for the Kob-Anderson model for three densities and show that the calculated values of τ α are in excellent agreement with simulation values for all densities. We also show that when ψ(T ), τ α and other quantities are plotted as a function of T /T a (or T a /T ) the data collapse on master curves.
description: 10 pages, 12 figures
MECHANICAL FLEXIBLE COUPLINGS FOR TORQUE TRANSMISSION BETWEEN TWO UNITS
Creators: name: Sasko Milev1
name: Darko Tasevski2
name: Mevludin Shabani3
name: Zoran Dimitrovski4
name: Blaze Rizov5
Publisher: name: Zenodo
Year: 2024
Subjects: Flexible couplings,
Torque transmission
Gear couplings

description: Mechanical flexible couplings transmit torque between two shafts and simultaneously eliminate vibrations andshock loads that may occur during machine operation. These couplings have ability to adapt to parallel, angularand axial movements of the shafts. In certain cases, flexible couplings can be used as "fuses" for the componentswhen subjected to torque loading. There are many types of mechanical flexible couplings for torquetransmission. One of the most commonly used categorizations group mechanical flexible couplings into: gearcouplings, chain couplings, grid couplings, slider couplings, spiral couplings, and bellows couplings. Each typeof coupling has a specific maximum tolerance for misalignmen
Phenomenological theory of the underdoped phase of a high-T$_c$ superconductor
Creators: name: Tsvelik, A. M.
name: Chubukov, A. V.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We model the Fermi surface of the cuprates by one-dimensional nested parts near $(0,π)$ and $(π,0)$ and unnested parts near the zone diagonals. Fermions in the nested regions form 1D spin liquids, and develop spectral gaps below some $\sim T^*$, but superconducting order is prevented by 1D phase fluctuations. We show that the Josephson coupling between order parameters at $(0,π)$ and $(π,0)$ locks their relative phase at a crossover scale $T^{**}< T^*$. Below $T^{**}$, the system response becomes two-dimensional, and the system displays Nernst effect. The remaining total phase gets locked at $T_c < T^{**}$, at which the system develops a (quasi-) long-range superconducting order.
description: 4 pages, 1 figure; typos corrected, references added
Size effects in strengthening of NiCo multilayers with modulated microstructures
Creators: name: Daly, Matthew
name: S Haldar
name: VK Rajendran
name: J McCrea
name: GD Hibbard
name: CV Singh
Publisher: name: University of Illinois at Chicago
Year: 2021
Subjects: subject: Mechanical Engineering
subject: FOS: Mechanical engineering

description: © 2019 Elsevier B.V. The influence of size effects on the mechanical properties of a new class of multilayer architectures are reported. In contrast to traditional multilayers, which are constructed from alternating layers of differing metallic species, the multilayer architectures examined in this study are comprised of a periodic layering of coarse-grained and nanocrystalline microstructural features of the same composition. Results of mechanical testing indicate that multilayer architectures exhibit a rule of mixtures response when the thicknesses of coarse-grained layers are large. However, an anomalous strengthening effect is observed in architectures where coarse-grained layer thicknesses approach their crystal size. This strengthening phenomenon is found to be directly correlated to the increased interfacial density between coarse-grained and nanocrystalline layers. Using a combination of mechanical testing and molecular dynamics simulations, an interface-mediated deformation twinning mechanism is uncovered, which is determined to underpin strengthening effects. Consequently, the relative influence of this deformation mechanism on flow behavior becomes increasingly significant in multilayer architectures with higher interfacial densities. For this reason, the associated strengthening effects are not significant in multilayers with thick coarse-grained layers but become apparent in architectures with the finest coarse-grained layers. Overall, this study explores deformation behavior in a new design-space within the multilayer architecture and provides insight into the interplay between size effects (i.e., crystal size and layer thickness), deformation mechanisms, and resultant mechanical performance.
Photograph of students and consultant
Creators: name: Asperheim, Margaret
name: Colleluori, Keira
name: Cross, Derek Joseph
name: Hien, Sansan Claude
name: Ngai, Nicholas
name: Talwani, Jasper
name: Tang, Chelsea
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: lob

description: This bundle contains a photo of the students in the Spring 2022 Ling 140 class, as well as Lobi speaker Sansan Claude Hien. In order from left to right, the photo depicts Margaret Asperheim, Nicholas Ngai, Derek Cross, Keira Colleruori, Chelsea Tang (on the computer screen), Jasper Talwani, and Sansan Claude Hien.
XXZ and Ising Spins on the Triangular Kagome Lattice
Creators: name: Yao, Dao-Xin
name: Loh, Yen Lee
name: Carlson, Erica W.
name: Ma, Michael
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The recently fabricated two-dimensional magnetic materials Cu9X2(cpa)6.xH2O (cpa=2-carboxypentonic acid; X=F,Cl,Br) have copper sites which form a triangular kagome lattice (TKL), formed by introducing small triangles (``a-trimers'') inside of each kagome triangle (``b-trimer''). We show that in the limit where spins residing on b-trimers have Ising character, quantum fluctuations of XXZ spins residing on the a-trimers can be exactly accounted for in the absence of applied field. This is accomplished through a mapping to the kagome Ising model, for which exact analytic solutions exist. We derive the complete finite temperature phase diagram for this XXZ-Ising model, including the residual zero temperature entropies of the seven ground state phases. Whereas the disordered (spin liquid) ground state of the pure Ising TKL model has macroscopic residual entropy ln72=4.2767... per unit cell, the introduction of transverse(quantum) couplings between neighboring $a$-spins reduces this entropy to 2.5258... per unit cell. In the presence of applied magnetic field, we map the TKL XXZ-Ising model to the kagome Ising model with three-spin interactions, and derive the ground state phase diagram. A small (or even infinitesimal) field leads to a new phase that corresponds to a non-intersecting loop gas on the kagome lattice, with entropy 1.4053... per unit cell and a mean magnetization for the b-spins of 0.12(1) per site. In addition, we find that for moderate applied field, there is a critical spin liquid phase which maps to close-packed dimers on the honeycomb lattice, which survives even when the a-spins are in the Heisenberg limit.
description: 12 pages, 12 figures
Unified gas-kinetic wave-particle method for gas-particle two phase flow from dilute to dense solid-particle limit
Creators: name: Yang, Xiaojian
name: Shyy, Wei
name: Xu, Kun
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: In this paper, a unified framework for particulate two-phase flow will be presented with a wide range of solid-particle concentration from dilute to dense limit. The two phase flow is simulated by two coupled flow solvers, i.e., the gas-kinetic scheme (GKS) for the gas phase and unified gas-kinetic wave-particle method (UGKWP) for the particle phase. The GKS is a second-order Navier-Stokes flow solver for the continuum flow. The UGKWP is a multiscale method for all flow regimes. The wave and particle decomposition in UGKWP depends on the cell's Knudsen number (Kn). At a small Kn number, the high concentrated solid particle phase will be modeled by the Eulerian hydrodynamic wave due to the intensive particle-particle collisions. At a large Kn number, the dilute solid particle will be sampled and followed by the Lagrangian particle formulation to capture the non-equilibrium transport. In the transition regime, the distribution and evolution of particle and wave in UGKWP are controlled by the local Kn number with a smooth transition between the above limits. In the current scheme, the two phase model improves the previous one in all following aspects: drag force model for different solid particle concentrations; the frictional pressure in inter-particle contacts at high solid-particle concentration; a flux limiting model to avoid solid particles' over-packing; additional non-conservative nozzle and work terms for the gas phase. Besides, the inter-particle collisions have been refined numerically for the dense particle flow through the discretization of the collision term and numerical flux function. The numerical scheme is tested in a series of typical gas-particle problems. The results validate the accuracy and reliability of the proposed method for gas-particle flow.
description: arXiv admin note: text overlap with arXiv:2107.05075
On adelic model of boson Fock space
Creators: name: Yuri, Neretin
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mathematical Physics (math-ph)
subject: Representation Theory (math.RT)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 11R56, 20G35, 46F12, 65R99

description: We construct a canonical embedding of the Schwartz space on $R^n$ to the space of distributions on the adelic product of all the $p$-adic numbers. This map is equivariant with respect to the action of the symplectic group $Sp(2n, Q)$ over rational numbers and with respect to the action of the rational Heisenberg group.
description: 8pp
RAQAMLI MUHITDA NOSHIRLIK FAOLIYATIDA MUALLIFLIK HUQUQINI HIMOYA QILISHNING XORIJIY TAJRIBASI VA UNI MILLIY QONUNCHILIGIMIZGA IMPLEMENTATSIYA QILISH MASALALARI
Creators: name: Abdug'affarova, Munavvar
Publisher: name: Zenodo
Year: 2024

description: Mazkur maqolada rivojlangan mamlakatlarning raqamli muhitda noshirlik faoliyatini amalga oshirishda mualliflik huquqini himoya qilish asoslari o‘rganiladi.
3D Studies of Neutral and Ionised Gas and Stars in Seyfert and Inactive Galaxies
Creators: name: Mundell, C. G.
name: Dumas, G.
name: Schinnerer, E.
name: Nagar, N.
name: Haan, S.
name: Wilcots, E.
name: Wilson, A. S.
name: Emsellem, E.
name: Ferruit, P.
name: Peletier, R. F.
name: De Zeeuw, P. T.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We are conducting the first systematic 3D spectroscopic imaging survey to quantify the properties of the atomic gas (HI) in a distance-limited sample of 28 Seyfert galaxies and a sample of 28 inactive control galaxies with well-matched optical properties (the VHIKINGS survey). This study aims to address the role of the host galaxy in nuclear activity and confront outstanding controversies in optical/IR imaging surveys. Early results show possible relationships between Seyfert activity and HI extent, content and the prevalence of small, nearby gas-rich dwarf galaxies (M(HI)~10^7 Msun); results will be tested via rigorous comparison with control galaxies. Initial results from our optical followup study of 15 of our galaxies using the SAURON integral field unit on the WHT suggest a possible difference between Seyfert and inactive stellar and gaseous kinematics that support the conclusion that internal kinematics of galaxies are the key to nuclear activity.
description: 6 pages to be published in the proceedings of "The Fate of Gas in Galaxies", held in Dwingeloo, July 2006
Decision process for blockchain architectures based on requirements
Creators: name: Six, Nicolas
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: In recent years, blockchain has grown in popularity due to its singular attributes, enabling the development of new innovative decentralized applications. But when companies consider leveraging blockchain for their applications, the plethora of possible choices and the difficulty of integrating blockchain into architectures can hinder its adoption. Our research project aims to ease the adoption of blockchain into companies, notably with the construction of an automated decision process to solve this issue in which requirements are first-class citizens, a knowledge base containing architectural patterns and blockchains refined over time, and an architecture generator able to process outputs into architectural stubs. This paper will also present our current progression on this decision process, by introducing the preliminary version that is able to choose the most suitable blockchain between multiple choices and our process-driven benchmarking tool.
Regionalwirtschaftliche Effekte der Biogasproduktion: Eine Analyse am Beispiel Niedersachsens
Creators: name: Guenther-Lübbers, Welf
name: Theuvsen, Ludwig
Publisher: name: Bundesministerium für Ernährung und Landwirtschaft
Year: 2015

description: In Deutschland ist die Biogasproduktion in den vergangenen zehn Jahren in erheblichem Umfang ausgebaut worden. Unter dem aktuellen EEG ist jedoch der weitere Biogasanlagenbau fast zum Erliegen gekommen, sodass der Eindruck entsteht, dass die Biogasproduktion an einem Wendepunkt angelangt ist und eine grundsätzliche Neuorientierung ansteht. Auf einzelbetrieblicher Ebene stehen bereits umfangreiche Analysen zu bisweilen aufgetretenen Effekten auf die Produktionsfaktoren Boden, Kapital und Arbeit zur Verfügung. Umfassende regionalökonomische Analysen, die alle Stufen der Biogas-Wertschöpfungskette berücksichtigen, sind dagegen nur sehr rar vorhanden. Vor diesem Hintergrund werden unter Zuhilfenahme der Ergebnisse einer empirischen Datenerhebung unter niedersächsischen Biogasanlagenbetreibern sowie Akteuren des vor- und nachgelagerten Bereichs die regionalwirtschaftlichen Effekte der Biogasproduktion dargestellt. Im Detail werden auf die regionale Verteilung der Zahlungsströme und -höhen in den verschiedenen Betriebsphasen einer Biogasanlage eingegangen sowie die Wertschöpfungs- und Arbeitsplatzeffekte im Zuge der Biogasproduktionslinie ermittelt. Die Ergebnisse zeigen unter anderem, dass ein Großteil der Wertschöpfung innerhalb Niedersachsens verbleibt. Mit ca. 70 % in der Bauphase und noch deutlich höheren Werten bei jährlichem Aufwand und Ertrag liegt dies im bundesweiten Vergleich über dem Durchschnitt.
description: Berichte über Landwirtschaft - Zeitschrift für Agrarpolitik und Landwirtschaft, Band 93, Heft 2, August 2015
On the editing distance of graphs
Creators: name: Axenovich, Maria
name: Kézdy, André
name: Martin, Ryan R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: An edge-operation on a graph $G$ is defined to be either the deletion of an existing edge or the addition of a nonexisting edge. Given a family of graphs $\mathcal{G}$, the editing distance from $G$ to $\mathcal{G}$ is the smallest number of edge-operations needed to modify $G$ into a graph from $\mathcal{G}$. In this paper, we fix a graph $H$ and consider ${\rm Forb}(n,H)$, the set of all graphs on $n$ vertices that have no induced copy of $H$. We provide bounds for the maximum over all $n$-vertex graphs $G$ of the editing distance from $G$ to ${\rm Forb}(n,H)$, using an invariant we call the {\it binary chromatic number} of the graph $H$. We give asymptotically tight bounds for that distance when $H$ is self-complementary and exact results for several small graphs $H$.
HATS-74Ab, HATS-75b, HATS-76b and HATS-77b: Four Transiting Giant Planets around K and M Dwarfs
Creators: name: Jordán, A.
name: Hartman, J. D.
name: Bayliss, D.
name: Bakos, G. Á.
name: Brahm, R.
name: Bryant, E. M.
name: Csubry, Z.
name: Henning, Th.
name: Hobson, M.
name: Mancini, L.
name: Penev, K.
name: Rabus, M.
name: Suc, V.
name: de Val-Borro, M.
name: Wallace, J.
name: Barkaoui, K.
name: Ciardi, D. R.
name: Collins, K. A.
name: Esparza-Borges, E.
name: Furlan, E.
name: Gan, T.
name: Ghachoui, M.
name: Gillon, M.
name: Howell, S.
name: Jehin, E.
name: Fukui, A.
name: Kawauchi, K.
name: Livingston, J. H.
name: Luque, R.
name: Matson, R.
name: Matthews, E. C.
name: Osborn, H. P.
name: Murgas, F.
name: Palle, E.
name: Waalkes, W. C.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The relative rarity of giant planets around low mass stars compared with solar-type stars is a key prediction from core accretion planet formation theory. In this paper we report on the discovery of four gas giant planets that transit low mass late K and early M dwarfs. The planets HATS-74Ab (TOI 737b), HATS-75b (TOI 552b), HATS-76b (TOI 555b), and HATS-77b (TOI 730b), were all discovered from the HATSouth photometric survey and followed-up using TESS and other photometric facilities. We use the new ESPRESSO facility at the VLT to confirm and systems and measure their masses. We find that that planets have masses of 1.46 +- 0.14 MJ , 0.491 +- 0.039 MJ , 2.629 +- 0.089 MJ and 1.374 +0.100-0.074 MJ , respectively, and radii of 1.032 +- 0.021 RJ , 0.884 +- 0.013 RJ , 1.079 +- 0.031 RJ , and 1.165 +- 0.021 RJ, respectively. The planets all orbit close to their host stars with orbital periods ranging from 1.7319 d to 3.0876 d. With further work we aim to test core accretion theory by using these and further discoveries to quantify the occurrence rate of giant planets around low mass host stars.
description: Accepted for publication in the Astronomical Journal
Ritter, André: Einheit und Gemeinschaft der Kirchen in versöhnter Verschiedenheit
Creators: name: Klaiber, Walter
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 64 Nr. 2 (2015): Ökumenische Rundschau, Band 64, Heft 2
Faddeev calculation of a $K^- p p$ quasi-bound state
Creators: name: Shevchenko, N. V.
name: Gal, A.
name: Mares, J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We report on the first genuinely three-body ${\bar K}NN - πΣN$ coupled-channel Faddeev calculation in search for quasi-bound states in the $K^- p p$ system. The main absorptivity in the $K^- p$ subsystem is accounted for by fitting to $K^- p$ data near threshold. Our calculation yields one such quasi-bound state, with $I=1/2$, $J^π=0^-$, bound in the range $B \sim 55-70$ MeV, with a width of $Γ\sim 95-110$ MeV. These results differ substantially from previous estimates, and are at odds with the $K^- p p \to Λp$ signal observed by the FINUDA collaboration.
description: Minor editorial revision; version accepted for publication in Phys. Rev. Lett
A avaliação da investigação e a Ciência Aberta
Creators: name: Ferreira, Eugénio C.
Publisher: name: Zenodo
Year: 2024

description: Apresentação realizada no Painel sobre "A avaliação da investigação e a Ciência Aberta", da 15ª Conferência Lusófona de Ciência Aberta, na Escola Superior de Enfermagem do Porto (ESEP), de 01 a 04 de outubro de 2024.
MOST Spacebased Photometry of the Transiting Exoplanet System HD 189733: Precise Timing Measurements for Transits Across an Active Star
Creators: name: Miller-Ricci, E.
name: Rowe, J. F.
name: Sasselov, D.
name: Matthews, J. M.
name: Kuschnig, R.
name: Croll, B.
name: Guenther, D. B.
name: Moffat, A. F. J
name: Rucinski, S. M.
name: Walker, G. A. H.
name: Weiss, W. W.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have measured transit times for HD 189733b passing in front of its bright (V = 7.67) chromospherically active and spotted parent star. Nearly continuous broadband optical photometry of this system was obtained with the MOST (Microvariability & Oscillations of STars) space telescope during 21 days in August 2006, monitoring 10 consecutive transits. We have used these data to search for deviations from a constant orbital period which can indicate the presence of additional planets in the system that are as yet undetected by Doppler searches. There are no transit timing variations above the level of ${\pm}45$ s, ruling out super-Earths (of masses $1 - 4 M_{\earth}$) in the 1:2 and 2:3 inner resonances and planets of 20 $M_{\earth}$ in the 2:1 outer resonance of the known planet. We also discuss complications in measuring transit times for a planet that transits an active star with large star spots, and how the transits can help constrain and test spot models. This has implications for the large number of such systems expected to be discovered by the CoRoT and Kepler missions.
description: 26 pages, 7 figures, accepted to ApJ
Sparse reconstruction by convex relaxation: Fourier and Gaussian measurements
Creators: name: Rudelson, Mark
name: Vershynin, Roman
Publisher: name: arXiv
Year: 2006
Subjects: subject: Numerical Analysis (math.NA)
subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 41A45, 46B09, 65T50, 68W20, 90C05

description: We want to exactly reconstruct a sparse signal f (a vector in R^n of small support) from few linear measurements of f (inner products with some fixed vectors). A nice and intuitive reconstruction by Linear Programming has been advocated since 80-ies by Dave Donoho and his collaborators. Namely, one can relax the reconstruction problem, which is highly nonconvex, to a convex problem -- and, moreover, to a linear program. However, when is exactly the reconstruction problem equivalent to its convex relaxation is an open question. Recent work of many authors shows that the number of measurements k(r,n) needed to exactly reconstruct any r-sparse signal f of length n (a vector in R^n of support r) from its linear measurements with the convex relaxation method is usually O(r polylog(n)). However, known estimates of the number of measurements k(r,n) involve huge constants, in spite of very good performance of the algorithms in practice. In this paper, we consider random Gaussian measurements and random Fourier measurements (a frequency sample of f). For Gaussian measurements, we prove the first guarantees with reasonable constants: k(r,n) < 12 r (2 + log(n/r)), which is optimal up to constants. For Fourier measurements, we prove the best known bound k(r,n) = O(r log(n) . log^2(r) log(r log n)), which is optimal within the log log n and log^3 r factors. Our arguments are based on the technique of Geometric Functional Analysis and Probability in Banach spaces.
description: References to related work added
Wet to dry self-transitions in dense emulsions: from order to disorder and back
Creators: name: Montessori, Andrea
name: Lauricella, Marco
name: Tiribocchi, Adriano
name: Bonaccorso, Fabio
name: Succi, Sauro
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: One of the most distinctive hallmarks of many-body systems far from equilibrium is the spontaneous emergence of order under conditions where disorder would be plausibly expected. Here, we report on the self-transition between ordered and disordered emulsions in divergent microfluidic channels, i.e. from monodisperse assemblies to heterogeneous polydisperse foam-like structures, and back again to ordered ones. The transition is driven by the nonlinear competition between viscous dissipation and surface tension forces as controlled by the device geometry, particularly the aperture angle of the divergent microfluidic channel. An unexpected route back to order is observed in the regime of large opening angles, where a trend towards increasing disorder would be intuitively expected.
[Pi]p analyzing powers from 87 to 269 MeV
Creators: name: Hofman, Gertjan J.
Publisher: name: University of British Columbia
Year: 2009

description: The ivp elastic scattering analyzing powers were measured across the energies spanning the A(1232) resonance. This work presents 7r+ data at the pion kinetic energies 117, 130, 139, 155, 169, 180, 193, 218, 241 and 267 MeV and ir~ data at the energies 87, 117, 193 and 241 MeV. The Canadian High Acceptance Orbit Spectrometer (CHAOS), which consists of tracking chambers and particle identification counters in a vertical magnet field geometry, was used for all the measurements. A dedicated, spin polarized, butanol target was employed in frozen spin mode. The 360° acceptance of the CHAOS spectrometer allowed a novel analysis technique that avoided the systematic errors normally associated with beam counting. Persistent target problems did not allow this experiment to measure exclusively at energies below 140 MeV as intended, and forced the use of previously measured analyzing power data in order to obtain an absolute calibration of the target polarization. A new measurement technique was employed, in which the beam energy was varied while maintaining the target polarization. This resulted in sets of analyzing powers at several energies that have no independent systematic error but only an overall normalization correction. A single-energy phase shift analysis using the Karlsruhe PHASAN program showed that the 'canonical' S-wave phase shifts of the KH80 analysis are not well determined at the energies covered by this work. The present results favor the phase shifts obtained by the VPl group (SM95) and hence supports their (lower) value for the pion-nucleon coupling constant glNN/4.ir = 13.7 ± 0.1. Due to the dominance of the P33 partial wave in this energy region, the analyzing powers can not discriminate between the various inconsistent sets of differential cross sections that at present hinder the extraction of fundamental parameters of QCD, such as the pion-nucleon cr-term.
Ethical and Responsible Use of AI/ML in the Earth, Space, and Environmental Sciences: New Community Recommendations
Creators: name: Vrouwenvelder, Kristina
Publisher: name: Zenodo
Year: 2023
Subjects: artificial intelligence
machine learning
ai
ethics
earth science

description: Presentation given in IN53A - AI Models in Earth Science II Oral at AGU 2023 in San Francisco. 

Presenter: Kristina Vrouwenvelder

Date: Friday, 15 December 2023

Title: Ethical and Responsible Use of AI/ML in the Earth, Space, and Environmental Sciences: New Community Recommendations

Abstract:

With the exponentially-increasing use of AI models in Earth and space science research, researchers, institutions, and policymakers must consider how to best integrate their use into the practice of science. To maintain reproducibility, reusability, and trust in science, and to minimize the risks associated with the use of AI and ML methods, we must make sure that these powerful new tools are used ethically. A new community report facilitated by AGU has developed a framework for anticipating and mitigating risks and ensuring these new tools enhance the practice of science for all stakeholders. Our report addresses key principles for researchers and scholarly organizations on the ethical use of AI and ML, with a focus on transparency, documentation, interpretation, replication, risk, bias, participatory methods and organizational practices. We will discuss the report and ethical framework, highlight specific recommendations from the report, and solicit feedback and support for the ongoing process of maintaining and updating these recommendations as the use of AI and ML continues to evolve.