cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Achieving the threshold regime with an over-screened Josephson junction
Creators: name: Sukhorukov, Eugene V.
name: Jordan, Andrew N.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We demonstrate that by utilizing an over-screened Josephson junction as a noise detector it is possible to achieve the threshold regime, whereby the tails of the fluctuating current distribution are measured. This situation is realized by placing the Josephson junction and mesoscopic conductor in an external circuit with very low impedance. In the underdamped limit, over-screening the junction inhibits the energy diffusion in the junction, effectively creating a tunable activation barrier to the dissipative state. As a result, the activation rate is qualitatively different from the Arrhenius form.
description: 4 pages, 1 figure; published version
befestigte Höhensiedlung der Eisenzeit auf dem Piepenkopf bei Lemgo
Creators: name: Dennis, Ian
name: Müller-Kissing, Johannes
name: Zelle, Michael
Publisher: name: Archäologie in Westfalen-Lippe
Year: 2021

description: -
description: Archäologie in Westfalen-Lippe, ARCHÄOLOGIE IN WESTFALEN-LIPPE 2019 (2020)
Kac's Central Limit Theorem by Stein's Method
Creators: name: Bhar, Suprio
name: Mukherjee, Ritwik
name: Patil, Prathmesh
Publisher: name: arXiv
Year: 2024
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60F05, 37A99

description: In $1946$, Mark Kac proved a Central Limit type theorem for a sequence of random variables that were not independent. The random variables under consideration were obtained from the angle-doubling map. The idea behind Kac's proof was to show that although the random variables under consideration were not independent, they were what he calls \textit{statistically independent} (in modern terminology, this concept is called long range independence). The final conclusion of his paper was that the sample averages of the random variables, suitably normalized converges to the standard normal distribution. We describe a new proof of Mark Kac's result by applying Stein's method and show that the normalized sample averages converge to the standard normal distribution in the Wasserstein metric, which is stronger than the convergence in distribution.
description: unintended typo "Victor Kac" has been corrected to "Mark Kac"; the article has been revised and shorted following comments from experts
Less is more: more scattering leading to less resistance
Creators: name: Znidaric, Marko
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the breaking of integrability by a finite density of dilute impurities, specifically the emerging diffusive transport. Provided the distance between impurities (localized perturbations) is large, one would expect that the scattering rates are additive, and therefore, the resistivity is proportional to the number of impurities (the so-called Matthiessen's rule). We show that this is, in general, not the case. If transport is anomalous in the original integrable system without impurities, the diffusion constant in the non-integrable system at low impurity density gets a nontrivial power-law dependence on the impurity density, with the power being determined by the dynamical scaling exponent of anomalous transport. We also find a regime at high impurity density in which, counterintuitively, adding more impurities to an already diffusive system increases transport rather than decreases it.
Auf weiter Flur – bronze- und eisenzeitliche Spuren in Münster-Handorf
Creators: name: Stamer, Simon
name: Speth Von Schülzburg, Charlotte
Publisher: name: Archäologie in Westfalen-Lippe
Year: 2021

description: -
description: Archäologie in Westfalen-Lippe, ARCHÄOLOGIE IN WESTFALEN-LIPPE 2019 (2020)
Clustering of Gravitational Wave and Supernovae events: a multitracer analysis in Luminosity Distance Space
Creators: name: Libanore, Sarah
name: Artale, Maria Celeste
name: Karagiannis, Dionysios
name: Liguori, Michele
name: Bartolo, Nicola
name: Bouffanais, Yann
name: Mapelli, Michela
name: Matarrese, Sabino
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We study the clustering of Gravitational Wave (GW) merger events and Supernovae IA (SN), as cosmic tracers in Luminosity Distance Space. We modify the publicly available CAMB code to numerically evaluate auto- and cross- power spectra for the different sources, including Luminosity Distance Space distortion effects generated by peculiar velocities and lensing convergence. We perform a multitracer Fisher analysis to forecast expected constraints on cosmological and GW bias coefficients, using outputs from hydrodinamical N-body simulations to determine the bias fiducial model and considering future observations from the Vera Rubin Observatory and Einstein Telescope (ET), both single and in a 3 detector network configuration. We find that adding SN to the GW merger dataset considerably improves the forecast, mostly by breaking significant parameter degeneracies, with final constraints comparable to those obtainable from a Euclid-like survey. GW merger bias is forecasted to be detectable with good significance even in the single ET case.
description: Version accepted for publication on JCAP, 25 pages, 10 figures
Neu entdeckt – ein Gräberfeld der Trichterbecherkultur in Heek-Nienborg
Creators: name: Pak, Lina
name: Pfeffer, Ingo
Publisher: name: Archäologie in Westfalen-Lippe
Year: 2021

description: -
description: Archäologie in Westfalen-Lippe, ARCHÄOLOGIE IN WESTFALEN-LIPPE 2019 (2020)
Volume 10: Issue 1: Exploring Grid-Forming Inverters
Creators: Various
Publisher: name: IEEE
Year: 2022

Volume 10: Issue 1: Exploring Grid-Forming Inverters
The emergence of grid-forming inverters dates to the early 2000s, following the advent of inverter-based microgrids and distributed energy resources. The "grid-forming" concept was introduced, mainly as a control paradigm for inverter-based resources, to assure the stability of microgrids. Since then, a wide variety of control strategies have been developed for grid-forming inverters, yet their applications are primarily in microgrids or small islands. In recent years, with the rapid growth of inverter-based resources in bulk power systems, there has been a resurgence of interest in grid-forming inverters from power system operators. However, a wide-scale adoption of grid-forming technology is still not ready since it requires updates to codes, standards, and guidelines, along with further developments of models and tools for system planning and operations. This issue of IEEE Electrification Magazine delivers five feature articles and two columns that share the prospects and challenges of grid-forming inverter technology. In addition, an article about e-bikes is included.
A Direct Precision Measurement of the Intergalactic Lyman-alpha Opacity at 2
Creators: name: Faucher-Giguere, C. -A.
name: Prochaska, J. X.
name: Lidz, A.
name: Hernquist, L.
name: Zaldarriaga, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We directly measure the evolution of the intergalactic Lya effective optical depth, tau_eff, over the redshift range 2~3 based on directly fitting the quasar continua in the Lya forest, which have generally neglected this effect, are therefore likely biased low. We provide estimates of the level of absorption arising from metals in the Lya forest based on both direct and statistical metal removal results in the literature, finding that this contribution is ~6-9% at z=3 and decreases monotonically with redshift. The high precision of our measurement, attaining 3% in redshift bins of width Delta z=0.2 around z=3, indicates significant departures from the best-fit power-law redshift evolution (tau_eff=0.0018(1+z)^3.92, when metals are left in), particularly near z=3.2. The observed downward departure is statistically consistent with a similar feature detected in a precision statistical measurement using Sloan Digital Sky Survey spectra by Bernardi and coworkers using an independent approach.
description: 27 pages, including 18 figures, published in ApJ
Quantized Vortices in Superfluid Dark Matter
Creators: name: Mauland, Renate
name: Elgarøy, Øystein
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: In 2015 Berezhiani & Khoury proposed a Superfluid Dark Matter (SFDM) model where dark matter condenses and forms a superfluid on galactic scales. In the superfluid state phonons interact with baryons, resulting in a behavior similar to that of Modified Newtonian Dynamics (MOND). If one assumes that the DM condensate rotates along with the galaxy, a grid of vortices should form throughout the superfluid component if the rotation is fast enough. We aim to investigate the size and impact of the vortices on surrounding baryons, and to further investigate the parameter space of the model. We also look for a possible vortex solution of the Lagrangian presented for the SFDM theory. We first take a simple approach and investigate vortex properties in a constant density DM halo, applying knowledge from condensed matter physics. We then use the zero-temperature condensate density profile as a template to vary the DM particle mass and the energy scale, $Λ$, of the SFDM model. Further, we attempt to find a vortex solution of the theory by extracting the Euler-Lagrange equation with respect to the modulus of the condensate wavefunction from the full relativistic SFDM Lagrangian. For the constant density approach we find that the vortices are on millimeter scale, and separated by distances $\sim0.002\,\rm{AU}$. The parameter space of the model is found to be substantial and a reduction in the DM particle mass leads to larger vortices with a higher energy. However, none of the parameter combinations explored here give both realistic values of $Λ$ and vortices energetic enough to have an observational impact on the galaxy as a whole. The vortex equation extracted from the Lagrangian of the model is unstable, and no solution exhibiting the standard properties of a vortex solution is found.
description: 33 pages, 16 figures
Paneuropäisches Netzwerk – die Jadeitbeilklinge von Schöppingen
Creators: name: Stapel, Bernhard
Publisher: name: Archäologie in Westfalen-Lippe
Year: 2021

description: -
description: Archäologie in Westfalen-Lippe, ARCHÄOLOGIE IN WESTFALEN-LIPPE 2019 (2020)
Siedeln am Limit – die befestigte linearbandkeramische Siedlung von Willebadessen
Creators: name: Pollmann, Hans-Otto
name: Rind, Michael Maria
name: Schierhold, Kerstin
Publisher: name: Archäologie in Westfalen-Lippe
Year: 2021

description: -
description: Archäologie in Westfalen-Lippe, ARCHÄOLOGIE IN WESTFALEN-LIPPE 2019 (2020)
Terahertz photocurrent probe of quantum geometry and interactions in magic-angle twisted bilayer graphene
Creators: name: Kumar, Roshan Krishna
name: Li, Geng
name: Bertini, Riccardo
name: Chaudhary, Swati
name: Nowakowski, Krystian
name: Park, Jeong Min
name: Castilla, Sebastian
name: Zhan, Zhen
name: Pantaleón, Pierre A.
name: Agarwal, Hitesh
name: Battle-Porro, Sergi
name: Icking, Eike
name: Ceccanti, Matteo
name: Reserbat-Plantey, Antoine
name: Piccinini, Giulia
name: Barrier, Julien
name: Khestanova, Ekaterina
name: Taniguchi, Takashi
name: Watanabe, Kenji
name: Stampfer, Christoph
name: Refael, Gil
name: Guinea, Francisco
name: Jarillo-Herrero, Pablo
name: Song, Justin C. W.
name: Stepanov, Petr
name: Lewandowski, Cyprian
name: Koppens, Frank H. L.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Moiré materials represent strongly interacting electron systems bridging topological and correlated physics. Despite significant advances, decoding wavefunction properties underlying the quantum geometry remains challenging. Here, we utilize polarization-resolved photocurrent measurements to probe magic-angle twisted bilayer graphene, leveraging its sensitivity to the Berry connection that encompasses quantum "textures" of electron wavefunctions. Using terahertz light resonant with optical transitions of its flat bands, we observe bulk photocurrents driven by broken symmetries and reveal the interplay between electron interactions and quantum geometry. We observe inversion-breaking gapped states undetectable through quantum transport, sharp changes in the polarization axes caused by interaction-induced band renormalization, and recurring photocurrent patterns at integer fillings of the moiré unit cell that track the evolution of quantum geometry through the cascade of phase transitions. The large and tunable terahertz response intrinsic to flat-band systems offers direct insights into the quantum geometry of interacting electrons and paves the way for innovative terahertz quantum technologies.
Optimal Power and Frequency Control of Microgrid Cluster With Mixed Loads
Creators: Saleh Dinkhah
Johana Salazar Cuellar
and Maryam Khanbaghi
Publisher: name: IEEE
Year: 2022

In this study, a residential microgrid cluster connected to a commercial microgrid cluster  has been considered.
In recent years, voltage and frequency regulation issues have been extensively discussed for the microgrid clusters (MGCs), as the high penetration of renewable energy resources (RES) might affect the continuous operation of the microgrid (MG). Furthermore, to enhance the MGC's operation reliability, stability concerns need to be addressed. In this study, a residential MGC connected to a commercial MGC has been considered. A novel control scheme that combines both droop control and virtual inertia control is proposed. This control strategy relies on online measurements, and it can be adapted to different situations. At each iteration, the damping coefficient and droop coefficient are calculated this allows the system to switch as needed between the droop and the virtual inertia controller. This dynamic coefficient calculation allows plug and play capability, which provides the MGC with major flexibility in terms of the MGs operation and flexibility.
Series expansion of the excess work using nonlinear response theory
Creators: name: Nazé, Pierre
name: Bonança, Marcus V. S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The calculation of observable averages in non-equilibrium regimes is one of the most important problems in statistical physics. Using the Hamiltonian approach of nonlinear response theory, we obtain a series expansion of the average excess work and illustrate it with specific examples of thermally isolated systems. We report the emergence of non-vanishing contributions for large switching times when the system is subjected to strong driving. The problem is solved by using an adapted multiple-scale method to suppress these secular terms. Our paradigmatic examples show how the method is implemented generating a truncated series that obeys the Second Law of Thermodynamics.
description: 10 pages, 5 figures
ESA F-Class Comet Interceptor: Trajectory Design to Intercept a Yet-to-be-discovered Comet
Creators: name: Sánchez, Joan Pau
name: Morante, David
name: Hermosin, Pablo
name: Ranuschio, Daniel
name: Estalella, Alvaro
name: Viera, Dayana
name: Centuori, Simone
name: Jones, Geraint
name: Snodgrass, Colin
name: Levasseur-Regourd, Anny Chantal
name: Tubiana, Cecilia
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Comet Interceptor (Comet-I) was selected in June 2019 as the first ESA F-Class mission. In 2029+, Comet-I will hitch a ride to a Sun-Earth L2 quasi-halo orbit, as a co-passenger of ESA's M4 ARIEL mission. It will then remain idle at the L2 point until the right departure conditions are met to intercept a yet-to-be-discovered long period comet (or interstellar body). The fact that Comet-I target is thus unidentified becomes a key aspect of the trajectory and mission design. The paper first analyses the long period comet population and concludes that 2 to 3 feasible targets a year should be expected. Yet, Comet-I will only be able to access some of these, depending mostly on the angular distance between the Earth and the closest nodal point to the Earth's orbit radius. A preliminary analysis of the transfer trajectories has been performed to assess the trade-off between the accessible region and the transfer time for a given spacecraft design, including a fully chemical, a fully electric and a hybrid propulsion system. The different Earth escape options also play a paramount role to enhance Comet-I capability to reach possible long period comet targets. Particularly, Earth-leading intercept configurations have the potential to benefit the most from lunar swing-by departures. Finally, a preliminary Monte Carlo analysis shows that Comet-I has a 95 to 99% likelihood of successfully visit a pristine newly-discovered long period comet in less than 6 years of mission timespan.
description: Preprint version of paper accepted for Acta Astronautica
Conformational Plasticity of HLA-B27 Molecules Correlates Inversely With Efficiency of Negative T Cell Selection
Creators: name: Loll, Bernhard
name: Rückert, Christine
name: Uchanska-Ziegler, Barbara
name: Ziegler, Andreas
Publisher: name: Freie Universität Berlin
Year: 2020
Subjects: subject: HLA-B27
subject: X-ray structure
subject: peptide binding modes
subject: conformational flexibility
subject: T cell selection
subject: central tolerance
subject: molecular mimicry
subject: ankylosing spondylitis
subject: 500 Naturwissenschaften und Mathematik::540 Chemie::540 Chemie und zugeordnete Wissenschaften

description: The development of autoimmune disorders is incompletely understood. Inefficient thymic T cell selection against self-peptides presented by major histocompatibility antigens (HLA in humans) may contribute to the emergence of auto-reactive effector cells, and molecular mimicry between foreign and self-peptides could promote T cell cross-reactivity. A pair of class I subtypes, HLA-B2705 and HLA-B2709, have previously been intensely studied, because they are distinguished from each other only by a single amino acid exchange at the floor of the peptide-binding groove, yet are differentially associated with the autoinflammatory disorder ankylosing spondylitis. Using X-ray crystallography in combination with ensemble refinement, we find that the non-disease-associated subtype HLA-B2709, when presenting the self-peptide pGR (RRRWHRWRL), exhibits elevated conformational dynamics, and the complex can also be recognized by T cells. Both features are not observed in case of the sequence-related self-peptide pVIPR (RRKWRRWHL) in complex with this subtype, and T cell cross-reactivity between pGR, pVIPR, and the viral peptide pLMP2 (RRRWRRLTV) is only rarely observed. The disease-associated subtype HLA-B2705, however, exhibits extensive conformational flexibility in case of the three complexes, all of which are also recognized by frequently occurring cross-reactive T cells. A comparison of the structural and dynamic properties of the six HLA-B27 complexes, together with their individual ability to interact with T cells, permits us to correlate the flexibility of HLA-B27 complexes with effector cell reactivity. The results suggest the existence of an inverse relationship between conformational plasticity of peptide-HLA-B27 complexes and the efficiency of negative selection of self-reactive cells within the thymus.
Thin accretion disk in the Simpson-Visser black-bounce and wormhole spacetimes
Creators: name: Bambhaniya, Parth
name: K, Saurabh
name: Jusufi, Kimet
name: Joshi, Pankaj S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We compare the optical appearance of a thin accretion disk in the Simpson-Visser spacetime to the Schwarzschild black hole case in this paper. We calculate and illustrate the red-shift and observed flux distributions as viewed by distant observers at various inclination angles. Simpson-Visser family of metrics create Novikov-Thorne (NT) accretion disks images that nearly look like a Schwarzschild black hole's NT accretion disk. We have studied also the embedding diagram, the electromagnetic properties of the accretion disk such as the temperature and the radiation flux of the energy by the accretion disk and the accretion efficiency. Compared to the Schwarzschild black hole, we find that the temperature, radiation flux of the energy, and the luminosity of the accretion disk increase by increasing the regularization parameter $'l'$. We conclude that, based on astrophysical observational signatures in the properties of the electromagnetic spectrum, we can distinguish the wormhole geometries from the regular black holes (black-bounce) and the Schwarzschild black hole.
description: 9 pages, 8 figures
Lispoceras undefined-2
Creators: name: Korn, Dieter
name: Bockwinkel, Jürgen
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Cephalopoda
Nautilida
Trigonoceratidae
Lispoceras
Lispoceras undefined-2

description: Lispoceras sp. 2
Fig. 31, Table 19
Material examined
ALGERIA •Ahnet, west-southwest of Gara Azzel Matti; ‘Dalle des Iridet’ (Ammonellipsites-Merocanites Assemblage; Tournaisian–Viséan boundary interval); Wendt and Kaufmann 1995 Coll.; illustrated in Fig. 31; MB.C.30488.
Description
Specimen MB.C.30488 is a fragmented conch with a diameter of almost 70 mm, it consists of a part of the body chamber, the phragmocone of the last whorl and a small piece of the second last whorl (the best-preserved piece is illustrated in Fig. 31). The conch is discoidal and subevolute (ww/dm=0.46; uw/ dm =0.41) with a depressed rectangular whorl profile. The flanks are almost parallel and separated from the flattened venter by a rounded but distinct ventrolateral shoulder. Any overlap of the whorls is not visible. The suture line shows a broadly rounded external lobe and a rounded lateral lobe.
description: Published as part of Korn, Dieter & Bockwinkel, Jürgen, 2022, Early Carboniferous nautiloids from the Central Sahara, southern Algeria, pp. 67-108 in European Journal of Taxonomy 831 on page 105, DOI: 10.5852/ejt.2022.831.1871, http://zenodo.org/record/6885198
Probing the Relation Between X-ray-Derived and Weak-Lensing-Derived Masses for Shear-Selected Galaxy Clusters: I. A781
Creators: name: Sehgal, Neelima
name: Hughes, John P.
name: Wittman, David
name: Margoniner, Vera
name: Tyson, J. Anthony
name: Gee, Perry
name: Dell'Antonio, Ian
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We compare X-ray and weak-lensing masses for four galaxy clusters that comprise the top-ranked shear-selected cluster system in the Deep Lens Survey. The weak-lensing observations of this system, which is associated with A781, are from the Kitt Peak Mayall 4-m telescope, and the X-ray observations are from both Chandra and XMM-Newton. For a faithful comparison of masses, we adopt the same matter density profile for each method, which we choose to be an NFW profile. Since neither the X-ray nor weak-lensing data are deep enough to well constrain both the NFW scale radius and central density, we estimate the scale radius using a fitting function for the concentration derived from cosmological hydrodynamic simulations and an X-ray estimate of the mass assuming isothermality. We keep this scale radius in common for both X-ray and weak-lensing profiles, and fit for the central density, which scales linearly with mass. We find that for three of these clusters, there is agreement between X-ray and weak-lensing NFW central densities, and thus masses. For the other cluster, the X-ray central density is higher than that from weak-lensing by 2 sigma. X-ray images suggest that this cluster may be undergoing a merger with a smaller cluster. This work serves as an additional step towards understanding the possible biases in X-ray and weak-lensing cluster mass estimation methods. Such understanding is vital to efforts to constrain cosmology using X-ray or weak-lensing cluster surveys to trace the growth of structure over cosmic time.
description: 14 pages, 7 figures, matches version in ApJ
Better coverage, better outcomes? Mapping mobile network data to official statistics using satellite imagery and radio propagation modelling
Creators: name: Koebe, Till
Publisher: name: Freie Universität Berlin
Year: 2020
Subjects: subject: Mapping
subject: mobile network data
subject: antenna- and commune-level
subject: satellite imagery
subject: radio propagation modelling
subject: 300 Sozialwissenschaften::330 Wirtschaft::330 Wirtschaft

description: Mobile sensing data has become a popular data source for geo-spatial analysis, however, mapping it accurately to other sources of information such as statistical data remains a challenge. Popular mapping approaches such as point allocation or voronoi tessellation provide only crude approximations of the mobile network coverage as they do not consider holes, overlaps and within-cell heterogeneity. More elaborate mapping schemes often require additional proprietary data operators are highly reluctant to share. In this paper, I use human settlement information extracted from publicly available satellite imagery in combination with stochastic radio propagation modelling techniques to account for that. I show in a simulation study and a real-world application on unemployment estimates in Senegal that better coverage approximations do not necessarily lead to better outcome predictions.
Slides for: Nonconvex Optimization Meets Low-Rank Matrix Factorization
Creators: Dr. Yuejie Chi
Publisher: name: IEEE
Year: 2022

Slides for: SPS Webinar, May 17, 2022, Dr. Yuejie Chi
Substantial progress has been made recently on developing provably accurate and efficient algorithms for low-rank matrix factorization via nonconvex optimization. While conventional wisdom often takes a dim view of nonconvex optimization algorithms due to their susceptibility to spurious local minima, simple iterative methods such as gradient descent have been remarkably successful in practice. The theoretical footings, however, had been largely lacking until recently. In this tutorial-style overview, we highlight the important role of statistical models in enabling efficient nonconvex optimization with performance guarantees. This presentation serves as a testament that the integrated consideration of optimization and statistics leads to fruitful research findings.
The nuclear star cluster and nuclear stellar disc of the Milky Way: Different stellar population and star formation history
Creators: name: Nogueras-Lara, Francisco
name: Schödel, Rainer
name: Neumayer, Nadine
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The Milky Way's nuclear stellar disc (NSD) and nuclear star cluster (NSC) are the main features of the Galactic centre. Nevertheless, their observation is hampered by the extreme source crowding and high extinction. Hence, their relation and formation scenario are not fully clear yet. We aim at detecting the stellar populations from the NSC and the NSD along the line-of-sight towards the NSC, and assess whether they have different stellar populations and star formation histories. We analysed the colour-magnitude diagram, $K_s$ vs. $H-K_s$, of a region of $8.2'\times2.8'$ centred on the NSC, and detected two different stellar groups with different extinctions. We studied their red clumps to find the features associated to each of the stellar populations. We obtained that the two groups of stars correspond to the NSD and the NSC, and found that they have significantly different stellar populations and star formation histories. We detected a double red clump for the NSD population, in agreement with previous work, whereas the NSC presents a more complex structure well fitted by three Gaussian features. We created extinction maps to analyse the extinction variation between the detected stellar groups. We found that the high-extinction layer varies on smaller scales (arc-seconds), and that there is a difference of $A_{K_s}\sim0.6$\,mag between both extinction layers. Finally, we obtained that the distance towards each of the stellar populations is compatible with the Galactic centre distance, and found some evidence of a slightly closer distance for the NSD stars ($\sim360\pm200$\,pc).
description: Accepted for publication in ApJ. 13 pages, 10 figures
Besuch vom Niederrhein – ein frühmesolithisches Inventar bei Attendorn-Wamge
Creators: name: Koch, Ingrid
name: Baales, Michael
Publisher: name: Archäologie in Westfalen-Lippe
Year: 2021

description: -
description: Archäologie in Westfalen-Lippe, ARCHÄOLOGIE IN WESTFALEN-LIPPE 2019 (2020)
Neues vom Ende der Altsteinzeit – die Grabungen in und vor der Blätterhöhle 2019
Creators: name: Heuschen, Wolfgang
name: Baales, Michael
name: Orschiedt, Jörg
Publisher: name: Archäologie in Westfalen-Lippe
Year: 2021

description: -
description: Archäologie in Westfalen-Lippe, ARCHÄOLOGIE IN WESTFALEN-LIPPE 2019 (2020)
Bounded Sobolev Norms for Linear Schrödinger Equations Under Resonant Perturbations
Creators: name: Wang, W. -M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Spectral Theory (math.SP)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 81xx

description: We prove that the Sobolev norm for a 1-D periodic Schroedinger equation remain bounded under small resonant perturbations.
Interpolating many-body wave functions for accelerated molecular dynamics on the near-exact electronic surface
Creators: name: Rath, Yannic
name: Booth, George H.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Computational Physics (physics.comp-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: While there have been many developments in computational probes of both strongly-correlated molecular systems and machine-learning accelerated molecular dynamics, there remains a significant gap in capabilities in simulating accurate non-local electronic structure over timescales on which atoms move. We develop an approach to bridge these fields with a practical interpolation scheme for the correlated many-electron state through the space of atomic configurations, whilst avoiding the exponential complexity of these underlying electronic states. With a small number of accurate correlated wave functions as a training set, we demonstrate provable convergence to near-exact potential energy surfaces for subsequent dynamics with propagation of a valid many-body wave function and inference of its variational energy whilst retaining a mean-field computational scaling. This represents a profoundly different paradigm to the direct interpolation of potential energy surfaces in established machine-learning approaches. We combine this with modern electronic structure approaches to systematically resolve molecular dynamics trajectories and converge thermodynamic quantities with a high-throughput of several million interpolated wave functions with explicit validation of their accuracy from only a few numerically exact quantum chemical calculations. We also highlight the comparison to traditional machine-learned potentials or dynamics on mean-field surfaces.
Funde aus den Knochenkiesen im Zuge der Landwehrbach-Renaturierung in Herne
Creators: name: Helling, Stephan
name: Schöllmann, Lothar
name: Bockelbrink, Philipp
Publisher: name: Archäologie in Westfalen-Lippe
Year: 2021

description: -
description: Archäologie in Westfalen-Lippe, ARCHÄOLOGIE IN WESTFALEN-LIPPE 2019 (2020)
Measuring the Mass of the Large Magellanic Cloud with Stellar Streams Observed by ${S}^5$
Creators: name: Shipp, Nora
name: Erkal, Denis
name: Drlica-Wagner, Alex
name: Li, Ting S.
name: Pace, Andrew B.
name: Koposov, Sergey E.
name: Cullinane, Lara R.
name: Da Costa, Gary S.
name: Ji, Alexander P.
name: Kuehn, Kyler
name: Lewis, Geraint F.
name: Mackey, Dougal
name: Simpson, Jeffrey D.
name: Wan, Zhen
name: Zucker, Daniel B.
name: Bland-Hawthorn, Joss
name: Ferguson, Peter S.
name: Lilleengen, Sophia
name: Collaboration, S5
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Stellar streams are excellent probes of the underlying gravitational potential in which they evolve. In this work, we fit dynamical models to five streams in the Southern Galactic hemisphere, combining observations from the Southern Stellar Stream Spectroscopic Survey (${S}^5$), Gaia EDR3, and the Dark Energy Survey (DES), to measure the mass of the Large Magellanic Cloud (LMC). With an ensemble of streams, we find a mass of the LMC ranging from 14 to $19 \times 10^{10}\ \mathrm{M}_{\odot}$, probed over a range of closest approach times and distances. With the most constraining stream (Orphan-Chenab), we measure an LMC mass of $18.8^{+ 3.5}_{- 4.0} \times 10^{10}\ \mathrm{M}_{\odot}$, probed at a closest approach time of 310 Myr and a closest approach distance of 25.4 kpc. This mass is compatible with previous measurements, showing that a consistent picture is emerging of the LMC's influence on structures in the Milky Way. Using this sample of streams, we find that the LMC's effect depends on the relative orientation of the stream and LMC at their point of closest approach. To better understand this, we present a simple model based on the impulse approximation and we show that the LMC's effect depends both on the magnitude of the velocity kick imparted to the stream and the direction of this kick.
description: 23 pages, 10 figures, submitted to ApJ
Electron-acoustic-phonon scattering and electron relaxation in two-coupled quantum rings
Creators: name: Piacente, G.
name: Hai, G. Q.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Electron relaxation, induced by acoustic phonons, is studied for coupled quantum rings in the presence of external fields, both electric and magnetic. We address the problem of a single electron in vertically coupled GaAs quantum rings. Electron-phonon interaction is accounted for both deformation potential and piezoelectric field coupling mechanisms. Depending on the external fields, the ring radii and the separation between the rings, we show that the two different couplings have different weights and importance. Significant oscillations are found in the scattering rates from electron excited states to the ground state, as a function of either the geometry of the system or the external fields.
description: 17 pages, 8 figures, to appear in Journal of Applied Physics
Theoretical study of phonon-assisted singlet-singlet relaxation in two-electron semiconductor quantum dot molecules
Creators: name: Grodecka, A.
name: Machnikowski, P.
name: Förstner, J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Phonon-assisted singlet-singlet relaxation in semiconductor quantum dot molecules is studied theoretically. Laterally coupled quantum dot structures doped with two electrons are considered. We take into account interaction with acoustic phonon modes via deformation potential and piezoelectric coupling. We show that piezoelectric mechanism for the considered system is of great importance and for some ranges of quantum dot molecule parameters is the dominant contribution to relaxation. It is shown that the phonon-assisted tunneling rates reach much higher values (up to 160 ns$^{-1}$ even at zero temperature) in comparison with other decoherence processes like spin-orbit coupling ($\sim$ 0.01 ns$^{-1}$). The influence of Coulomb interaction is discussed and its consequences are indicated. We calculate the relaxation rates for GaAs quantum dot molecules and study the dependence on quantum dot size, distance and offset between the constituent quantum dots. In addition the temperature dependence of the tunneling rates is analyzed.
description: 4 pages, 12 figures, To be presented at NOEKS9, submitted to PSS
Grid-Forming Inverters (Slides)
Creators: Wei Du
Publisher: name: IEEE
Year: 2022

This presentation will be a journey from a single microgrid to an integrated transmission & distribution system with 10,000+ inverters.
The presentation includes three parts. First, it will review the basic concepts of droop control and share the field experience on how CERTS Microgrid deals with overload events through autonomous control design. Second, it will provide a comparative study of two widely used grid-forming controls—single- and multi-loop droop controls. An insight will be provided to help understand the differences between the two widely used control strategies. EMT simulation, small signal analysis, and HIL testing will be provided to verify and explain this understanding. Finally, this presentation will share some simulation work performed on an integrated T&D co-simulation platform that has 10,000+ grid-forming and grid-following inverters leveraging the U.S. DOE invested open-source tools. The stability boundary identified through this case study will be discussed.
This presentation will be a journey from a single microgrid to an integrated transmission & distribution system with 10,000+ inverters.
The presentation includes three parts. First, it will review the basic concepts of droop control and share the field experience on how CERTS Microgrid deals with overload events through autonomous control design. Second, it will provide a comparative study of two widely used grid-forming controls—single- and multi-loop droop controls. An insight will be provided to help understand the differences between the two widely used control strategies. EMT simulation, small signal analysis, and HIL testing will be provided to verify and explain this understanding. Finally, this presentation will share some simulation work performed on an integrated T&D co-simulation platform that has 10,000+ grid-forming and grid-following inverters leveraging the U.S. DOE invested open-source tools. The stability boundary identified through this case study will be discussed.
A Systematic Literature Review of Undergraduate Data Science Education Research
Creators: name: Dogucu, Mine
name: Demirci, Sinem
name: Bendekgey, Harry
name: Ricci, Federica Zoe
name: Medina, Catalina M.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Other Statistics (stat.OT)
subject: FOS: Computer and information sciences

description: The presence of data science has been profound in the scientific community in almost every discipline. An important part of the data science education expansion has been at the undergraduate level. We conducted a systematic literature review to (1) portray current evidence and knowledge gaps in self-proclaimed undergraduate data science education research and (2) inform policymakers and the data science education community about what educators may encounter when searching for literature using the general keyword 'data science education.' While open-access publications that target a broader audience of data science educators and include multiple examples of data science programs and courses are a strength, significant knowledge gaps remain. The undergraduate data science literature that we identified often lacks empirical data, research questions and reproducibility. Certain disciplines are less visible. We recommend that we should (1) cherish data science as an interdisciplinary field; (2) adopt a consistent set of keywords/terminology to ensure data science education literature is easily identifiable; (3) prioritize investments in empirical studies.
description: 4 figures and 2 tables
Paläontologische Grabung Balve – Einblicke in ein terrestrisches Ökosystem der Kreide
Creators: name: Schwermann, Achim H.
Publisher: name: Archäologie in Westfalen-Lippe
Year: 2021

description: -
description: Archäologie in Westfalen-Lippe, ARCHÄOLOGIE IN WESTFALEN-LIPPE 2019 (2020)
Panel Session: Managing High Penetration DERs with Integrated System Modeling (slides)
Creators: R. Broadwater
A. Saunders
Publisher: name: IEEE
Year: 2022

Learn how a digital twin can you help you integrated DERs into your network. With modeling and simulation of a combined grid network including transmission and distribution, greater situational awareness is achieved to help you in ensuring reliability and control. You will learn how anomalies are detected as well as inverter behavior when there is a high concentration on a feeder.
Learn how a digital twin can you help you integrated DERs into your network. With modeling and simulation of a combined grid network including transmission and distribution, greater situational awareness is achieved to help you in ensuring reliability and control. You will learn how anomalies are detected as well as inverter behavior when there is a high concentration on a feeder.
Presentations and Panelists:
• “Faster than Realtime Simulation: Preparing for DERs” (focus on modeling of transmission/distribution and detection of anomalies) by R. Broadwater, EDD
• “Faster than Realtime Simulation: Preparing for DERs” (focus on use of irradiance data for operational use) by A. Saunders, Clean Power Research
Electric Field Modeling Practices and Sensitivity Analysis for Transmission Line Composite Insulators (TR97)
Creators: Chair: Timothy Shaw (EPRI)
Members & Contributors: Kevin Edmonds (NGK Insulators)
Steve Bell (K-Line Insulators)
Publisher: name: IEEE
Year: 2022

This document addresses issues with setting up 3D models of transmission lines to calculate the electric field (E-field) accurately and effectively. Modeling software have become robust and capable of complex problem solving but without careful consideration of model creation and solution parameters, the results can be inaccurate, or the modeling time can become long. This paper identifies several situations where modelers can improve both accuracy and efficiency by understanding the modeling choices available.

This document addresses issues with setting up 3D models of transmission lines to calculate the electric field (E-field) accurately and effectively. Modeling software have become robust and capable of complex problem solving but without careful consideration of model creation and solution parameters, the results can be inaccurate, or the modeling time can become long. This paper identifies several situations where modelers can improve both accuracy and efficiency by understanding the modeling choices available.
Sensitivity of KM3NeT to Violation of Equivalence Principle
Creators: name: Chianese, Marco
name: Fiorillo, Damiano F. G.
name: Mangano, Gianpiero
name: Miele, Gennaro
name: Morisi, Stefano
name: Pisanti, Ofelia
Publisher: name: arXiv
Year: 2021
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 - Experiment (hep-ex)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The symmetry of the theory of relativity under diffeomorphisms strongly depends on the equivalence principle. Violation of Equivalence Principle (VEP) can be tested by looking for deviations from the standard framework of neutrino oscillations. In recent works, it has been shown that strong constraints on the VEP parameter space can be placed by means of the atmospheric neutrinos observed by the IceCube neutrino telescope. In this paper, we focus on the KM3NeT neutrino telescope and perform a forecast analysis to assess its capacity to probe VEP. Most importantly, we examine the crucial role played by systematic uncertainties affecting the neutrino observations. We find that KM3NeT will constrain VEP parameters times the local gravitational potential at the level of $10^{-27}$. Due to the systematic-dominated regime, independent analyses from different neutrino telescopes are fundamental for robustly testing the equivalence principle.
description: 7 pages, 2 figures
The clinical nurse specialist in British Columbia
Creators: name: Halliday, Shirley Ann Lilly
Publisher: name: University of British Columbia
Year: 2010

description: A lack of clarity concerning a description of the role of the clinical nurse specialist in Canadian nursing was the problem addressed in this thesis. A role enactment view of role theory and reported research findings about what clinical nurse specialists actually do (Aradine and Denyes, 1972) were utilized as a framework for study. A questionnaire was developed and a mail survey was conducted with a self-identified group of 147 clinical nurse specialists in British Columbia. Both descriptive analysis and analyses of relationships among variables were carried out. Generally speaking it was found that: (1) there is still a lack of clarity about the role in British Columbia, (2) the primary means by which an individual nurse becomes a clinical nurse specialist in British Columbia is through experience in the system, (3) a description of the role articulated in American nursing literature by Aradine and Denyes (1972) does not fit the description reported by the subjects, and (4) statistically significant relationships exist among some of the variables examined and estimates of weekly work time reported by the subjects. The findings suggest there is a need for nursing leaders in the areas of education and service to work together on issues concerning the role of the clinical nurse specialist in Canada.
Pflanzenfossilien aus dem Wealden (Berriasium, Unterkreide) von Tecklenburg-Brochterbeck
Creators: name: Pott, Christian
Publisher: name: Archäologie in Westfalen-Lippe
Year: 2021

description: -
description: Archäologie in Westfalen-Lippe, ARCHÄOLOGIE IN WESTFALEN-LIPPE 2019 (2020)
Device and Time Invariant Features for Transferable Non-Intrusive Load Monitoring
Creators: Pascal A. Schirmer and Iosif Mporas
Publisher: name: IEEE
Year: 2022

In this article we propose a transferability approach for Non-Intrusive Load Monitoring using fractional calculus and normalized Karhunen Loeve Expansion based spectrograms followed by a Convolutional Neural Network in order to generate device characteristic features that do not change significantly across different households.
Non-Intrusive Load Monitoring aims to extract the energy consumption of individual electrical appliances through disaggregation of the total power consumption as measured by a single smart meter in a household. Although when data from the same household are used to train a disaggregation model the device disaggregation accuracy is quite high (80% - 95%), depending on the number of devices, the use of pre-trained disaggregation models in new households in most cases results in a significant reduction of disaggregation accuracy. In this article we propose a transferability approach for Non-Intrusive Load Monitoring using fractional calculus and normalized Karhunen Loeve Expansion based spectrograms followed by a Convolutional Neural Network in order to generate device characteristic features that do not change significantly across different households. The performance of the proposed methodology was evaluated using two publicly available datasets, namely REDD and REFIT. The proposed transferability approach improves the Mean Absolute Error by 13.1% when compared to other transfer learning approaches for energy disaggregation.