cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The Spectral Decomposition of the Helium atom two-electron configuration in terms of Hydrogenic orbitals
Creators: name: Hutchinson, J.
name: Baker, M.
name: Marsiglio, F.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The two electron configuration in the Helium atom is known to very high precision. Yet, we tend to refer to this configuration as a $1s\uparrow 1s\downarrow$ singlet, where the designations refer to Hydrogen orbitals. The high precision calculations utilize basis sets that are suited for high accuracy and ease of calculation, but do not really aid in our understanding of the electron configuration in terms of product states of Hydrogen orbitals. Since undergraduate students are generally taught to think of Helium, and indeed, the rest of the periodic table, in terms of Hydrogenic orbitals, we present in this paper a detailed spectral decomposition of the two electron ground state for Helium in terms of these basis states. The $1s\uparrow 1s\downarrow$ singlet contributes less than 93% to the ground state configuration, with other contributions coming from both bound and continuum Hydrogenic states.
description: 13 pages, 1 figure; suitable for and undergraduate and/or graduate course in quantum mechanics + some implications for electron-electron interactions in strongly correlated materials
Refined Black Hole Ensembles and Topological Strings
Creators: name: Aganagic, Mina
name: Schaeffer, Kevin
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Algebraic Geometry (math.AG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We formulate a refined version of the Ooguri-Strominger-Vafa (OSV) conjecture. The OSV conjecture that Z_{BH} = |Z_{top}|^2 relates the BPS black hole partition function to the topological string partition function Z_{top}. In the refined conjecture, Z_{BH} is the partition function of BPS black holes counted with spin, or more precisely the protected spin character. Z_{top} becomes the partition function of the refined topological string, which is itself an index. Both the original and the refined conjecture are examples of large N duality in the 't Hooft sense. The refined conjecture applies to non-compact Calabi-Yau manifolds only, so the black holes are really BPS particles with large entropy, of order N^2. The refined OSV conjecture states that the refined BPS partition function has a large N dual which is captured by the refined topological string. We provide evidence that the conjecture holds by studying local Calabi-Yau threefolds consisting of line bundles over a genus g Riemann surface. We show that the refined topological string partition function on these geometries is computed by a two-dimensional TQFT. We also study the refined black hole partition function arising from N D4 branes on the Calabi-Yau, and argue that it reduces to a (q,t)-deformed version of two-dimensional SU(N) Yang-Mills. Finally, we show that in the large N limit this theory factorizes to the square of the refined topological string in accordance with the refined OSV conjecture.
description: 49+17 pages, 5 figures
Additional file 1 of Eculizumab as a treatment for C3 glomerulopathy: a single-center retrospective study
Creators: name: Welte, Thomas
name: Arnold, Frederic
name: Westermann, Lukas
name: Rottmann, Felix A.
name: Hug, Martin J.
name: Neumann-Haefelin, Elke
name: Ganner, Athina
Publisher: name: figshare
Year: 2023
Subjects: subject: Medicine
subject: Ecology
subject: FOS: Biological sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: Cancer
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: Additional file 1: Supplementary Table S1. Patients` characteristics. Supplementary Table S2. Overview of individual outcomes. Supplementary Table S3. Overview of cohort outcomes grouped by eculizumab treatment. Supplementary Fig. S1. Course of eGFR and UPCR for individual cases. Supplementary Fig. S2. Course of serum albumin and urine blood for individual cases.
1024 Elementary Particles
Creators: name: Lighthouse, Richard
Publisher: name: Zenodo
Year: 2014
Subjects: Elementary particles
Blinking universe
cosmology
quantum gravity
mass gaps

description: This short technical paper presents a new standard model for Elementary Particles. All elementary particle masses are related by simple math. This math is similar to the math used for wifi signals and it is called 1024-QAM. The 1024-QAM table graphically displays how all elementary particles are related, similar to the Standard Periodic Table in chemistry. If we line up all of the particle masses in order, we find there are a number of "gaps." These are called the mass gaps, and they line up perfectly with 1024-QAM, which fits the sequence.
Supersymmetry (SUSY) is also found to occur with 1024-QAM. Mass Groups 1 thru 8 have heavyweight counterparts which are found in Mass Groups 9 thru 16.  4 new particles are predicted to be discovered between 0.7 to 15 TeV. Also, 4 new particles are predicted to be discovered between 30 to 200 TeV. Numerous other new particles are predicted using 1024-QAM. The only possible explanation for elementary particles to match a QAM pattern, is due to a blinking or discrete universe. This ebook provides compelling evidence that our universe is literally blinking, off and on. This blinking frequency is about 1.1 THz.
This author challenges scientists in the particle physics field to provide a better model than 1024-QAM, that will fit the "mass gaps." I suggest starting with a QAM model and see what format you think will best fit the experimental data that is already available. In my opinion, the data to support 1024-QAM is already available at CERN, Berkeley, Fermi Lab, Brookhaven, Perimeter Institute, and Stanford. No expensive, new experiment will need to be run.
Tri-Resonant Leptogenesis in a Seesaw Extension of the Standard Model
Creators: name: da Silva, P. Candia
name: Karamitros, D.
name: McKelvey, T.
name: Pilaftsis, A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study a class of leptogenesis models where the light neutrinos acquire their observed small masses by a symmetry-motivated construction. This class of models may naturally include three nearly degenerate heavy Majorana neutrinos that can strongly mix with one another and have mass differences comparable to their decay widths. We find that such a tri-resonant heavy neutrino system can lead to leptonic CP asymmetries which are further enhanced than those obtained in the usual bi-resonant approximation. Moreover, we solve the Boltzmann equations by paying special attention to the temperature dependence of the relativistic degrees of freedom of the plasma. The latter results in significant corrections to the evolution equations for the heavy neutrinos and the lepton asymmetry that have been previously ignored in the literature. We show the importance of these corrections to accurately describe the dynamical evolution of the baryon-to-photon ratio $η_B$ for heavy neutrino masses at and below $100$ GeV, and demonstrate that successful leptogenesis at lower masses can be significantly affected by the variation of the relativistic dofs. The parameter space for the leptogenesis model is discussed, and it could be probed in future experimental facilities searching for charged lepton flavour violation and heavy neutrinos in future $Z$-boson factories.
description: 42 pages, 10 figures, additional references included, inclusion of additional clarifying comments, to appear in JHEP
title: The female athlete triad in a subsample of female WWU athletes
Creators: name: Langenberg, Colby
Publisher: name: Western Washington University
Year: 2010

description:
High performance female athletes can jeopardize their health if their energy requirements during preparations for competitions are excessive. The problems that result are called the Female Athlete Triad characterized by low energy availability with or without disordered eating, menstrual dysfunction/ amenorrhea, and osteoporosis and either alone or in combination can lead to more serious pathologies. The goal here is to determine whether intercollegiate female athletes exhibit elements of the triad at Western Washington University. Sixteen athletes from Western Washington University's soccer and cross-country program were recruited. Participant's average age was 19.24 years with an average height of 65.83 inches, average weight at 131.69 lbs and 23.08% body fat and 21.43. Each participant provided 72 hour dietary recall, and kept daily records on menstrual cycle changes and daily activities during and after the competitive season. Body composition and bone density was assessed during and after the season. Also collected daily, were urine samples for measures of estrogen, progesterone and cortisol (a stress marker). None of the athletes suffered from all three components of the triad but fourteen were deficient in caloric intake and many were in macronutrient intakes (Deficiencies: sixteen for Vitamin D.; ten for calcium; thirteen in magnesium; nine in iron and all for potassium). Caloric intake remained the same even during competition while expenditure differed significantly (p=0.05). Estrogen and progesterone levels were lower but not pathologically lower during the competitive season.
A note on the Duffin-Schaeffer conjecture with slow divergence
Creators: name: Aistleitner, Christoph
Publisher: name: arXiv
Year: 2013
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11K60, 11J83

description: For a non-negative function $ψ: ~ \N \mapsto \R$, let $W(ψ)$ denote the set of real numbers $x$ for which the inequality $|n x - a| < ψ(n)$ has infinitely many coprime solutions $(a,n)$. The Duffin--Schaeffer conjecture, one of the most important unsolved problems in metric number theory, asserts that $W(ψ)$ has full measure provided {equation} \label{dsccond} \sum_{n=1}^\infty \frac{ψ(n) φ(n)}{n} = \infty. {equation} Recently Beresnevich, Harman, Haynes and Velani proved that $W(ψ)$ has full measure under the \emph{extra divergence} condition $$ \sum_{n=1}^\infty \frac{ψ(n) φ(n)}{n \exp(c (\log \log n) (\log \log \log n))} = \infty \qquad \textrm{for some $c>0$}. $$ In the present note we establish a \emph{slow divergence} counterpart of their result: $W(ψ)$ has full measure, provided\eqref{dsccond} holds and additionally there exists some $c>0$ such that $$ \sum_{n=2^{2^h}+1}^{2^{2^{h+1}}} \frac{ψ(n) φ(n)}{n} \leq \frac{c}{h} \qquad \textrm{for all \quad $h \geq 1$.} $$
description: 4 pages; for version 2 some typos have been fixed and a corollary has been added; for version 3, some further minor changes have been made. The manuscript has been accepted for publication by Bull. London Math. Soc
Mapping renormalized coupled cluster methods to quantum computers through a compact unitary representation of non-unitary operators
Creators: name: Peng, Bo
name: Kowalski, Karol
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Non-unitary theories are commonly seen in the classical simulations of quantum systems. Among these theories, the method of moments of coupled-cluster equations (MMCCs) and the ensuing classes of the renormalized coupled-cluster (CC) approaches have evolved into one of the most accurate approaches to describe correlation effects in various quantum systems. The MMCC formalism provides an effective way for correcting energies of approximate CC formulations (parent theories) using moments, or CC equations, that are not used to determine approximate cluster amplitudes. In this paper, we propose a quantum algorithm for computing MMCC ground-state energies that provide two main advantages over classical computing or other quantum algorithms: (i) the possibility of forming superpositions of CC moments of arbitrary ranks in the entire Hilbert space and using an arbitrary form of the parent cluster operator for MMCC expansion; and (ii) significant reduction in the number of measurements in quantum simulation through a compact unitary representation for a generally non-unitary operator. We illustrate the robustness of our approach over a broad class of test cases, including ~40 molecular systems with varying basis sets encoded using 4~40 qubits, and exhibit the detailed MMCC analysis for the 8-qubit half-filled, four-site, single impurity Anderson model and 12-qubit hydrogen fluoride molecular system from the corresponding noise-free and noisy MMCC quantum computations. We also outline the extension of MMCC formalism to the case of unitary CC wave function ansatz.
Problemáticas socioeconómicas y medioambientales asociadas a la agricultura y producción del aguacate Hass
Creators: name: González Malagón, Victoria Eugenia
Publisher: name: Zenodo
Year: 2023

description: El consumo y la producción de los mercados bajo el modelo capitalista actual ha tenido como consecuencia la destrucción del medio ambiente. Sumado a esto, problemáticas de desigualdad frente a la acumulación de capital en la industria conlleva a una competencia injusta entre pequeños y medianos productores en comparación con las grandes empresas. Las grandes ganancias por parte de la industria agrícola intensificaron los monocultivos de aguacate Hass que responden a las demandas de exportación hacia países del norte global. 
Este escrito busca hacer una reflexión sobre las consecuencias que la industria agrícola a través del monocultivo de aguacate Hass ha ocasionado a nivel socioeconómico y medioambiental.
High resolution compact implicit numerical scheme for conservation laws
Creators: name: Frolkovič, Peter
name: Žeravý, Michal
Publisher: name: arXiv
Year: 2022
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 65M06 (Primary), 65M22 (Secondary)

description: We present a novel implicit scheme for the numerical solution of time-dependent conservation laws. The core idea of the presented method is to exploit and approximate the mixed spatial-temporal derivative of the solution that occurs naturally when deriving some second order accurate schemes in time. Such an approach is introduced in the context of the Lax-Wendroff (or Cauchy-Kowalevski) procedure when the second time derivative is not completely replaced by space derivatives using the PDE, but the mixed derivative is kept. If approximated in a suitable way, the resulting compact implicit scheme produces algebraic systems that have a more convenient structure than the systems derived by fully implicit schemes. We derive a high resolution TVD form of the implicit scheme for some representative hyperbolic equations in the one-dimensional case, including illustrative numerical experiments.
description: Significantly revised version that is accepted to AMC journal
Tm-doped fiber laser mode-locked by graphene-polymer composite
Creators: name: Zhang, M.
name: Kelleher, E. J. R.
name: Torrisi, F.
name: Sun, Z.
name: Hasan, T.
name: Popa, D.
name: Wang, F.
name: Ferrari, A. C.
name: Popov, S. V.
name: Taylor, J. R.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We demonstrate mode-locking of a thulium-doped fiber laser operating at 1.94μm, using a graphene-based saturable absorber. The laser outputs 3.6ps pulses, with~0.4nJ energy and an amplitude fluctuation~0.5%, at 6.46MHz. This is a simple, low-cost, stable and convenient laser oscillator for applications where eye-safe and low-photon-energy light sources are required, such as sensing and biomedical diagnostics
Constructing Realistic Szekeres Models from Initial and Final Data
Creators: name: Walters, Anthony
name: Hellaby, Charles
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The Szekeres family of inhomogeneous solutions, which are defined by six arbitrary metric functions, offers a wide range of possibilities for modelling cosmic structure. Here we present a model construction procedure for the quasispherical case using given data at initial and final times. Of the six arbitrary metric functions, the three which are common to both Szekeres and Lemaître-Tolman models are determined by the model construction procedure of Krasinski & Hellaby. For the remaining three functions, which are unique to Szekeres models, we derive exact analytic expressions in terms of more physically intuitive quantities - density profiles and dipole orientation angles. Using MATLAB, we implement the model construction procedure and simulate the time evolution.
description: 40 pages; 18 figures; To be published in JCAP
Large-scale hydrogen production in a net-zero economy: implications for water and land use
Creators: name: Tonelli, Davide
Publisher: name: Zenodo
Year: 2023
Subjects: Green hydrogen
Water Electrolysis
Renewable Energy
Net-zero Emissions
Water Scarcity
Hydrogen Economy
Sustainability

description: This repositories contains the following files: computation.zip: scripts to produce the results of the paper saved in .csv format. Scripts should be run following the numerical order of the names; plots.zip: scripts to reproduce the figures presented in the paper; Supporting Database.xlsx: database collecting spatially-explicit and country-specific data of the renewable potential and country-specific demand of hydrogen and electricity in 2020 and 2050
Large-scale hydrogen production in a net-zero economy: implications for water and land use
Creators: name: Tonelli, Davide
name: Rosa, Lorenzo
name: Gabrielli, Paolo
name: Caldeira, Ken
name: Parente, Alessandro
name: Contino, Francesco
Publisher: name: Zenodo
Year: 2023
Subjects: Green hydrogen
Water Electrolysis
Renewable Energy
Net-zero Emissions
Water Scarcity
Hydrogen Economy
Sustainability

description: This repositories contains the following files: computation.zip: scripts to produce the results of the paper saved in .csv format. Scripts should be run following the numerical order of the names; plots.zip: scripts to reproduce the figures presented in the paper; Supporting Database.xlsx: database collecting spatially-explicit and country-specific data of the renewable potential and country-specific demand of hydrogen and electricity in 2020 and 2050
Fundamental-mode eigenfrequencies of neutral and charged twin neutron stars
Creators: name: Goncalves, Victor P.
name: Jiménez, José C.
name: Lazzari, Lucas
Publisher: name: arXiv
Year: 2022
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate the effects of rapid and slow conversions on the fundamental-mode eigenfrequencies of hybrid neutron stars having highly discontinuous transitions between hadronic and quark matter, the so-called twin stars. We analyze some characteristic cases in the available parameter space of the equations of state for the hadronic and quark phases. Furthermore, we also consider the possibility that these stellar configurations are electrically charged. Our results indicate that for neutral configurations under rapid conversions the stability window coincides with the usual stability criterion, i.e. $\partial M/\partial p_c > 0$ and that the two branches are disconnected. This discontinuity remains when electric charge is considered, but the usual criterion is not sufficient to determine the star's stability. On the other hand, slow conversions connect initially disconnected branches and increase the stability window of the hybrid configurations. For both conversion speeds, the presence of electric charge diminishes the magnitude of the eigenfrequencies and its stability window.
description: 11 pages, 6 figures. Version published in EPJC
Effects of breaking vibrational energy equipartition on measurements of temperature in macroscopic oscillators subject to heat flux
Creators: name: Conti, Livia
name: De Gregorio, Paolo
name: Karapetyan, Gagik
name: Lazzaro, Claudia
name: Pegoraro, Matteo
name: Bonaldi, Michele
name: Rondoni, Lamberto
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences
subject: 82D20

description: When the energy content of a resonant mode of a crystalline solid in thermodynamic equilibrium is directly measured, assuming that quantum effects can be neglected it coincides with temperature except for a proportionality factor. This is due to the principle of energy equipartition and the equilibrium hypothesis. However, most natural systems found in nature are not in thermodynamic equilibrium and thus the principle cannot be granted. We measured the extent to which the low-frequency modes of vibration of a solid can defy energy equipartition, in presence of a steady state heat flux, even close to equilibrium. We found, experimentally and numerically, that the energy separately associated with low frequency normal modes strongly depends on the heat flux, and decouples sensibly from temperature. A 4% in the relative temperature difference across the object around room temperature suffices to excite two modes of a macroscopic oscillator, as if they were at equilibrium, respectively, at temperatures about 20% and a factor 3.5 higher. We interpret the result in terms of new flux-mediated correlations between modes in the nonequilibrium state, which are absent at equilibrium.
description: Second version. 15 pages and 7 figures of main text, plus 15 pages, 5 figures and 2 tables of supplementary material. Previous version dated 15 March 2013 and was uploaded 22 May 2013
Travel time reliability in transportation networks: A review of methodological developments
Creators: name: Zang, Zhaoqi
name: Xu, Xiangdong
name: Qu, Kai
name: Chen, Ruiya
name: Chen, Anthony
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Economics (econ.GN)
subject: FOS: Economics and business

description: The unavoidable travel time variability in transportation networks, resulted from the widespread supply side and demand side uncertainties, makes travel time reliability (TTR) be a common and core interest of all the stakeholders in transportation systems, including planners, travelers, service providers, and managers. This common and core interest stimulates extensive studies on modeling TTR. Researchers have developed a range of theories and models of TTR, many of which have been incorporated into transportation models, policies, and project appraisals. Adopting the network perspective, this paper aims to provide an integrated framework for reviewing the methodological developments of modeling TTR in transportation networks, including its characterization, evaluation and valuation, and traffic assignment. Specifically, the TTR characterization provides a whole picture of travel time distribution in transportation networks. TTR evaluation and TTR valuation (known as the value of reliability, VOR) simply and intuitively interpret abstract characterized TTR to be well understood by different stakeholders of transportation systems. TTR-based traffic assignment investigates the effects of TTR on the individual users travel behavior and consequently the collective network flow pattern. As the above three topics are mainly separately studied in different disciplines and research areas, the integrated framework allows us to better understand their relationships and may contribute to developing possible combinations of TTR modeling philosophy. Also, the network perspective enables to focus on common challenges of modeling TTR, especially the uncertainty propagation from the uncertainty sources to the TTR at spatial levels including link, route, and the entire network. Some directions for future research are discussed in the era of new data environment, applications, and emerging technologies.
description: This is an extended version of the paper submitted to the TR Part C
Brandgräber der jüngeren Bronzezeit in Metternich bei Koblenz
Creators: name: Günther, A.
Publisher: name: Bonner Jahrbücher
Year: 2018

description: -
description: Bonner Jahrbücher, Bd. 119 (1910): Bonner Jahrbücher : Jahrbücher des Vereins von Altertumsfreunden im Rheinlande
EMVLight: a Multi-agent Reinforcement Learning Framework for an Emergency Vehicle Decentralized Routing and Traffic Signal Control System
Creators: name: Su, Haoran
name: Zhong, Yaofeng D.
name: Chow, Joseph Y. J.
name: Dey, Biswadip
name: Jin, Li
Publisher: name: arXiv
Year: 2022
Subjects: subject: Artificial Intelligence (cs.AI)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Emergency vehicles (EMVs) play a crucial role in responding to time-critical calls such as medical emergencies and fire outbreaks in urban areas. Existing methods for EMV dispatch typically optimize routes based on historical traffic-flow data and design traffic signal pre-emption accordingly; however, we still lack a systematic methodology to address the coupling between EMV routing and traffic signal control. In this paper, we propose EMVLight, a decentralized reinforcement learning (RL) framework for joint dynamic EMV routing and traffic signal pre-emption. We adopt the multi-agent advantage actor-critic method with policy sharing and spatial discounted factor. This framework addresses the coupling between EMV navigation and traffic signal control via an innovative design of multi-class RL agents and a novel pressure-based reward function. The proposed methodology enables EMVLight to learn network-level cooperative traffic signal phasing strategies that not only reduce EMV travel time but also shortens the travel time of non-EMVs. Simulation-based experiments indicate that EMVLight enables up to a $42.6\%$ reduction in EMV travel time as well as an $23.5\%$ shorter average travel time compared with existing approaches.
description: 19 figures, 10 tables. Manuscript extended on previous work arXiv:2109.05429, arXiv:2111.00278
Intrinsic Fano factor of nuclear recoils for dark matter searches
Creators: name: Matheny, M.
name: Roberts, A.
name: Srinivasan, A.
name: Villano, A. N.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Nuclear recoils in germanium and silicon are shown to have much larger variance in electron-hole production than their electron-recoil counterparts for recoil energies between 10 and 200\,keV. This effect--owing primarily to deviations in the amount of energy given to the crystal lattice in response to a nuclear recoil of a given energy--has been predicted by the Lindhard model. We parameterize the variance in terms of an intrinsic nuclear recoil Fano factor which is 24.3$\pm$0.2 and 26$\pm$8 at around 25\,keV for silicon and germanium respectively. The variance has important effects on the expected signal shapes for experiments utilizing low-energy nuclear recoils such as direct dark matter searches and coherent neutrino-nucleus scattering measurements.
description: 9 pages, 6 figures
Pulsational amplitude growth of the star KIC 3429637 (HD 178875) in the context of Am and rho Puppis stars
Creators: name: Murphy, Simon J.
name: Grigahcene, A.
name: Niemczura, E.
name: Kurtz, D. W.
name: Uytterhoeven, K.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: KIC 3429637 (HD 178875) is a delta Sct star whose light-curve shows continuous pulsational amplitude growth in Kepler Mission photometry. Analysis of the three largest amplitude peaks in the Fourier transform indicates different growth rates for all three. We have ruled out instrumental causes, and determine the amplitude growth to be intrinsic to the star. We calculate time-dependent convection models and compare them with the observations. We confirm earlier characterisations that KIC 3429637 is a marginal Am star through the analysis of new spectroscopic data. With the data presently available, a plausible cause of the amplitude growth is increasing pulsational driving as evolutionary changes shift the He II driving zone deeper in this rho Puppis star. If this model is correct, then we are watching real-time stellar evolutionary changes.
description: 4 tables, 6 figures (incl. 2 colour; fine for grayscale printing). Accepted for publication in MNRAS
Berichte über die bei den Versammlungen des Vereins von Altertumsfreunden gehaltenen Vorträge
Creators: name: Redaktion, Die
Publisher: name: Bonner Jahrbücher
Year: 2018

description: -
description: Bonner Jahrbücher, Bd. 124 (1917): Bonner Jahrbücher : Jahrbücher des Vereins von Altertumsfreunden im Rheinlande
Global land and water limits to electrolytic hydrogen production using wind and solar resources
Creators: name: Tonelli, Davide
name: Rosa, Lorenzo
name: Gabrielli, Paolo
name: Caldeira, Ken
name: Parente, Alessandro
name: Contino, Francesco
Publisher: name: Zenodo
Year: 2023
Subjects: Green hydrogen
Water Electrolysis
Renewable Energy
Net-zero Emissions
Water Scarcity
Hydrogen Economy
Sustainability

description: This repositories contains the following files: calculations.zip: scripts to produce the results of the paper saved in .csv format. Scripts should be run following the numerical order of the names. All results are derived for the reference scenario of hydrogen demand in 2050; plots.zip: scripts to reproduce the figures presented in the paper; demand_hydrogen_range.zip: folder containing three folders: upper: containing calculations and plots relative to upper scenario of hydrogen demand in 2050; lower: containing calculations and plots relative to lower scenario of hydrogen demand in 2050; combination: scripts to plot Figure 1 and Figure 2 with interval bars which combine the results for the lower and upper scenarios of hydrogen demand; Supporting Database.xlsx: database collecting spatially-explicit and country-specific data of the renewable potential and country-specific demand of hydrogen and electricity in 2020 and 2050.
Computational Topology Counterexamples with 3D Visualization of Bezier Curves
Creators: name: Li, J.
name: Peters, T. J.
name: Marsh, D.
name: Jordan, K. E.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57Q37, 57Q55, 57M25, 68R10

description: For applications in computing, Bezier curves are pervasive and are defined by a piecewise linear curve L which is embedded in R^3 and yields a smooth polynomial curve C embedded in R^3. It is of interest to understand when L and C have the same embeddings. One class of counterexamples is shown for L being unknotted, while C is knotted. Another class of counterexamples is created where L is equilateral and simple, while C is self-intersecting. These counterexamples were discovered using curve visualizing software and numerical algorithms that produce general procedures to create more examples.
description: 21 pages, 19 figures
MaGICC Thick Disk I: Comparing a Simulated Disk Formed with Stellar Feedback to the Milky Way
Creators: name: Stinson, G. S.
name: Bovy, J.
name: Rix, H. -W.
name: Brook, C.
name: Roškar, R.
name: Dalcanton, J. J.
name: Macciò, A. V.
name: Wadsley, J.
name: Couchman, H. M. P.
name: Quinn, T. R.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We analyse the structure and chemical enrichment of a Milky Way-like galaxy with a stellar mass of 2 10^{10} M_sun, formed in a cosmological hydrodynamical simulation. It is disk-dominated with a flat rotation curve, and has a disk scale length similar to the Milky Way's, but a velocity dispersion that is ~50% higher. Examining stars in narrow [Fe/H] and [α/Fe] abundance ranges, we find remarkable qualitative agreement between this simulation and observations: a) The old stars lie in a thickened distribution with a short scale length, while the young stars form a thinner disk, with scale lengths decreasing, as [Fe/H] increases. b) Consequently, there is a distinct outward metallicity gradient. c) Mono-abundance populations exist with a continuous distribution of scale heights (from thin to thick). However, the simulated galaxy has a distinct and substantive very thick disk (h_z~1.5 kpc), not seen in the Milky Way. The broad agreement between simulations and observations allows us to test the validity of observational proxies used in the literature: we find in the simulation that mono-abundance populations are good proxies for single age populations (<1 Gyr) for most abundances.
description: 11 page, 10 figures, submitted. Comments welcome
Human-Multirobot Collaborative Mobile Manipulation: the Omnid Mocobots
Creators: name: Elwin, Matthew L.
name: Strong, Billie
name: Freeman, Randy A.
name: Lynch, Kevin M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: The Omnid human-collaborative mobile manipulators are an experimental platform for testing control architectures for autonomous and human-collaborative multirobot mobile manipulation. An Omnid consists of a mecanum-wheel omnidirectional mobile base and a series-elastic Delta-type parallel manipulator, and it is a specific implementation of a broader class of mobile collaborative robots ("mocobots") suitable for safe human co-manipulation of delicate, flexible, and articulated payloads. Key features of mocobots include passive compliance, for the safety of the human and the payload, and high-fidelity end-effector force control independent of the potentially imprecise motions of the mobile base. We describe general considerations for the design of teams of mocobots; the design of the Omnids in light of these considerations; manipulator and mobile base controllers to achieve useful multirobot collaborative behaviors; and initial experiments in human-multirobot collaborative mobile manipulation of large, unwieldy payloads. For these experiments, the only communication among the humans and Omnids is mechanical, through the payload.
description: 8 pages, 10 figures. Videos available at https://www.youtube.com/watch?v=SEuFfONryL0. Submitted to IEEE Robotics and Automation Letters (RA-L)
title: Building Regulations are in a Terrible State, but I Have a Solution
Creators: name: Sirr, Lorcan
Publisher: name: Technological University Dublin
Year: 2016

description: Inspection of buildings by the state during construction and on completion has led to a huge gap in Ireland’s building history. An almost total lack of state inspection—and, since 1990, a reliance on self-regulation —has contributed to situations such as those at Priory Hall in Dublin and Millfield Manor in Kildare.
Superexchange and spin-orbit coupling in monolayer and bilayer chromium trihalides
Creators: name: Song, Kok Wee
name: Fal'ko, Vladimir I
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We build a microscopic model to study the intra- and inter-layer superexchange due to electrons hopping in chromium trihalides ($\mathrm{CrX}_3$, X= Cl, Br, and I). In evaluating the superexchange, we identify the relevant intermediate excitations in the hopping. In our study, we find that the intermediate hole-pairs excitations in the $p$-orbitals on X ion play a crucial role in mediating various types of exchange interactions. In particular, the inter-layer antiferromagnetic exchange may be realized by the hole-pair-mediated superexchange. Interestingly, we also find that these virtual hopping processes compete with each other leading to weak intra-layer ferromagnetic exchange. In addition, we also study the spin-orbit coupling effects on the superexchange and investigate the Dzyaloshinskii-Moriya interaction. Finally, we extract the microscopic model parameters from density functional theory for analyzing the exchange interactions in a monolayer $\mathrm{CrI}_3$.
description: 18 pages, 4 figures, minor corrections with more references added
Assessing vertebrate biodiversity across the Chesapeake Bay using environmental DNA metabarcoding
Creators: name: Rodriguez, Lauren Kelly
Publisher: name: Digital Repository at the University of Maryland
Year: 2023
Subjects: subject: Environmental science
subject: Genetics
subject: FOS: Biological sciences
subject: Zoology
subject: Chesapeake
subject: eDNA
subject: fish
subject: genomics
subject: metabarcoding
subject: vertebrates

description: Through the collection and sequencing of trace genomic evidence from environmental samples (e.g., water, air, and soil), environmental DNA (eDNA) metabarcoding can detect a range of vertebrates. Despite the dynamic characteristics of estuarine environments, which often hinder the persistence of genomic material, this project successfully employed metabarcoding to assess the distribution of vertebrates in the Chesapeake Bay. Primarily, the study evaluated the effects of using various eDNA sampling, laboratory, and post-hoc analysis techniques when investigating species presence and biodiversity of an area. This study also identified spatially-explicit fish communities along salinity gradients as described by a Generalized Additive Mixed Model (GAMM) and a Permutational Multivariate Analysis of Variance (PERMANOVA). Community compositions were similar to previous findings by traditional trawling and seining methods. This research supports the usefulness of eDNA metabarcoding to assess species presence across spatiotemporal extents, making it a promising tool for future biomonitoring efforts in the Chesapeake Bay.
Elastoresistivity in the incommensurate charge density wave phase of BaNi$_{\textrm{2}}$(As$_{\textrm{1-x}}$P$_{\textrm{x}}$)$_{\textrm{2}}$
Creators: name: Frachet, M.
name: Wiecki, P. W.
name: Lacmann, T.
name: Souliou, S. M.
name: Willa, K.
name: Meingast, C.
name: Merz, M.
name: Haghighirad, A. -A.
name: Tacon, M. Le
name: Böhmer, A. E.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Electronic nematicity, the breaking of the crystal lattice rotational symmetry by the electronic fluid, is a fascinating quantum state of matter. Recently, BaNi$_2$As$_2$ has emerged as a promising candidate for a novel type of nematicity triggered by charge fluctuations. In this work, we scrutinize the electronic nematicity of BaNi$_2$(As$_{1-x}$P$_x$)$_2$ with $0 \leq x \leq 0.10$ using electronic transport measurements under strain. We report a large $B_{1g}$ elastoresistance coefficient that is maximized at a temperature slightly higher than the first-order triclinic transition, and that corresponds to the recently discovered tetragonal-to-orthorhombic transition. The reported elastoresistance does not follow the typical Curie-Weiss form observed in iron-based superconductors but has a much sharper temperature dependence with a finite elastoresistance onsetting only together with a strong enhancement of the incommensurate charge density wave of the material. Consequently, the $B_{1g}$ elastoresistance and the associated orthorhombic distortion appears here as a property of this incommensurate charge density wave. Finally, we report and track the hysteretic behavior seen in the resistance versus strain sweeps and interpret its origin as the pinning of orthorhombic domains. Our results revise the understanding of the interplay between nematicity, charge density waves and structural distortions in this material.
description: 10 pages, 5 figures. Supplementary materials available on request
Light Forms Function
Creators: name: Centeno, Cristhy Guadalupe
Publisher: name: Digital Repository at the University of Maryland
Year: 2023
Subjects: subject: Architecture
subject: FOS: Civil engineering
subject: Design Studios
subject: Eclectic Forms
subject: Institutional School
subject: Lighting

description: Light is essential for understanding design as well as living and working in structures. Although it cannot be produced, its perception shapes architectural spaces and forms. It creates a mood by lighting surfaces with texture and materials. It also has a significant influence on our biological and mental well-being. This thesis will investigate the programs, different lighting strategies, and typological precedents used by design schools, as well as collect questionnaires and interviews from building users. To enhance and support users' daily lives, it will also examine methods for capturing, rerouting, darkening, and framing natural and artificial light luminosity. The University of Maryland's School of Architecture, Planning, and Preservation Building would eventually be redesigned using the knowledge acquired. Due to the amount of time, students spend in schools, it is essential to design primarily for the visual requirements of the users and their expected functions inside a given space. This is because schools may serve as students' second homes.
Einzelfunde von Vetera 1913/1914
Creators: name: Hagen, Josef
Publisher: name: Bonner Jahrbücher
Year: 2018

description: -
description: Bonner Jahrbücher, Bd. 124 (1917): Bonner Jahrbücher : Jahrbücher des Vereins von Altertumsfreunden im Rheinlande
Kronecker product in terms of Hubbard operators and the Clebsch-Gordan decomposition of SU(2)xSU(2)
Creators: name: Rosas-Ortiz, Oscar
name: Enriquez, Marco
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We review the properties of the Kronecker (direct, or tensor) product of square matrices $A \otimes B \otimes C \cdots$ in terms of Hubbard operators. In its simplest form, a Hubbard operator $X_n^{i,j}$ can be expressed as the $n$-square matrix which has entry 1 in position $(i,j)$ and zero in all other entries. The algebra and group properties of the observables that define a multipartite quantum system are notably straightforward in such a framework. In particular, we use the Kronecker product in Hubbard notation to get the Clebsch-Gordan decomposition of the product group $SU(2) \times SU(2)$. Finally, the $n$-dimensional irreducible representations so obtained are used to derive closed forms of the Clebsch-Gordan coefficients that rule the addition of angular momenta. Our results can be further developed in many different directions.
description: 64 pages, no figures. Some references and two new sections have been included. The applications have been extended to the Hubbard and t-J models (Section 2.4) as well as to the diagonalization of the Hamiltonian in the Heisenberg model and to the solving of the Jaynes-Cummings problem in Hubbard notation (Section 3.4)
I-Love-Q in Hořava-Lifshitz Gravity
Creators: name: Ajith, Siddarth
name: Yagi, Kent
name: Yunes, Nicolás
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Hořava-Lifshitz gravity is an alternative theory to general relativity which breaks Lorentz invariance in order to achieve an ultraviolet complete and power-counting renormalizable theory of gravity. In the low energy limit, Hořava-Lifshitz gravity coincides with a vector-tensor theory known as khronometric gravity. The deviation of khronometric gravity from general relativity can be parametrized by three coupling constants: $α$, $β$, and $λ$. Solar system experiments and gravitational wave observations impose stringent bounds on $α$ and $β$, while $λ$ is still relatively unconstrained ($λ\lesssim 0.01$). In this paper, we study whether one can constrain this remaining parameter with neutron star observations through the universal I-Love-Q relations between the moment of inertia (I), the tidal Love number (Love), and the quadrupole moment (Q), which are insensitive to details in the nuclear matter equation of state. To do so, we perturbatively construct slowly-rotating and weakly tidally-deformed neutron stars in khronometric gravity. We find that the I-Love-Q relations are independent of $λ$ in the limit $(α,β) \to 0$. Although some components of the field equations depend on $λ$, we show through induction and a post-Minkowskian analysis that slowly-rotating neutron stars do not depend on $λ$ at all. Tidally deformed neutron stars, on the other hand, are modified in khronometric gravity (though the usual Love number is not modified, as mentioned earlier), and there are potentially new, non-GR Love numbers, though their observability is unclear. These findings indicate that it may be difficult to constrain $λ$ with rotating/tidally-deformed neutron stars.
description: 18 pages. Added a new Appendix, added additional explanation to Sects. II and III, and added a small clarification to Sect. V, no change to main results