cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Hybrid Millimeter-Wave Systems: A Novel Paradigm for HetNets
Creators: name: Mehrpouyan, Hani
name: Matthaiou, Michail
name: Wang, Rui
name: Karagiannidis, George K.
name: Hua, Yingbo
Publisher: name: arXiv
Year: 2015
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Heterogeneous Networks (HetNets) are known to enhance the bandwidth efficiency and throughput of wireless networks by more effectively utilizing the network resources. However, the higher density of users and access points in HetNets introduces significant inter-user interference that needs to be mitigated through complex and sophisticated interference cancellation schemes. Moreover, due to significant channel attenuation and presence of hardware impairments, e.g., phase noise and amplifier nonlinearities, the vast bandwidth in the millimeter-wave band has not been fully utilized to date. In order to enable the development of multi-Gigabit per second wireless networks, we introduce a novel millimeter-wave HetNet paradigm, termed hybrid HetNet, which exploits the vast bandwidth and propagation characteristics in the 60 GHz and 70-80 GHz bands to reduce the impact of interference in HetNets. Simulation results are presented to illustrate the performance advantage of hybrid HetNets with respect to traditional networks. Next, two specific transceiver structures that enable hand-offs from the 60 GHz band, i.e., the V-band to the 70-80 GHz band, i.e., the E-band, and vice versa are proposed. Finally, the practical and regulatory challenges for establishing a hybrid HetNet are outlined.
description: 12 pages, 5 Figures, IEEE Communication Magazine. In press
On the Lie subalgebra of Killing-Milne and Killing-Cartan vector fields in Newtonian space-time
Creators: name: Chamel, N.
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The Galilean (and more generally Milne) invariance of Newtonian theory allows for Killing vector fields of a general kind, whereby the Lie derivative of a field is not required to vanish but only to be cancellable by some infinitesimal Galilean (respectively Milne) gauge transformation. In this paper, it is shown that both the Killing-Milne vector fields, which preserve the background Newtonian space-time structure, and the Killing-Cartan vector fields, which in addition preserve the gravitational field, form a Lie subalgebra.
description: 8 pages
Bayesian uncertainty quantification of perturbative QCD input to the neutron-star equation of state
Creators: name: Gorda, Tyler
name: Komoltsev, Oleg
name: Kurkela, Aleksi
name: Mazeliauskas, Aleksas
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The equation of state of neutron-star cores can be constrained by requiring a consistent connection to the perturbative Quantum Chromodynamics (QCD) calculations at high densities. The constraining power of the QCD input depends on uncertainties from missing higher-order terms, the choice of the unphysical renormalization scale, and the reference density where QCD calculations are performed. Within a Bayesian approach, we discuss the convergence of the perturbative QCD series, quantify its uncertainties at high densities, and present a framework to systematically propagate the uncertainties down to neutron-star densities. We find that the effect of the QCD input on the neutron-star inference is insensitive to the various unphysical choices made in the uncertainty estimation.
description: Version 2 - published version, minor changes. 12 pages, 10 figs
Individual Fairness for Social Media Influencers
Creators: name: Ionescu, Stefania
name: Pagan, Nicolo
name: Hannak, Aniko
Publisher: name: arXiv
Year: 2023
Subjects: subject: Social and Information Networks (cs.SI)
subject: Multiagent Systems (cs.MA)
subject: FOS: Computer and information sciences

description: Nowadays, many social media platforms are centered around content creators (CC). On these platforms, the tie formation process depends on two factors: (a) the exposure of users to CCs (decided by, e.g., a recommender system), and (b) the following decision-making process of users. Recent research studies underlined the importance of content quality by showing that under exploratory recommendation strategies, the network eventually converges to a state where the higher the quality of the CC, the higher their expected number of followers. In this paper, we extend prior work by (a) looking beyond averages to assess the fairness of the process and (b) investigating the importance of exploratory recommendations for achieving fair outcomes. Using an analytical approach, we show that non-exploratory recommendations converge fast but usually lead to unfair outcomes. Moreover, even with exploration, we are only guaranteed fair outcomes for the highest (and lowest) quality CCs.
title: Biotreatment of industrial effluents containing naphthalene sulphonate
Creators: name: Senior, Kerry Charles
Publisher: name: University of Kent
Year: 2022

description: Naphthalene-2-sulphonate (NSA) is a frequently reported pollutant of industrial wastewaters. NS A was detected in the biologically treated effluent from a tannery (TE) (61.78 mg L"1 ± 0.67) and the untreated effluent from a chemical manufacturing plant (CE) (25.29 mg L"1 ± 0.06). Both effluents also contained significant concentrations of naphthalene sulphonate-formaldehyde condensates (SNFC). NSA and SNFC contributed a large fraction of the COD of TE (33.03% of total COD) and CE (48.31% of total COD). BOD5 determinations indicated that this COD fraction would be refractory to conventional biological treatment and would subsequently be discharged into the environment. Two NSA-degrading isolates, Sphingomonas sp. (RBN) and Comamonas testosteroni (BAS), were isolated from acclimated activated sludges, by enrichment with NSA as sole source of carbon and energy. Both isolates degraded NSA via a plasmid�encoded catabolic pathway analogous to the naphthalene degradation pathway. Inoculation of a suspended floe reactor treating a mixed feed containing NSA with RBN, resulted in a 112.5% increase in the NSA removal rate (¿/e) and a 29.9% increase in the total organic removal rate (k). The survival of RBN after inoculation was determined by chromosomal marking with green fluorescent protein (gfp). Sphingomonas sp. strain RBNg/p persisted in a suspended floe reactor (4.3% of total CFU) for 14 d after inoculation and increased (10.8% of total CFU) in response to shock loading of the reactor with NSA (250 mg L'1). The recovery time from shock loading of the reactor, was reduced compared to a matched reactor inoculated with plasmid-cured RBNg/£>. The results suggest that the bioaugmentation of biological treatment plants with NSA-degrading isolates would be a promising route for the remediation of NSA-contaminated effluents. It is believed that this is the first report of the use of bioaugmentation of biological treatment processes for the remediation of effluents containing NSA. Neither RBN nor BAS utilised the SNFC compound #22 as sole source of carbon and energy. Compound #22 was also not degraded cometabolically in the presence of NSA. Photochemical oxidation with Fenton reagent of compound #22 did not increase its biodegradability by RBN or its BOD5 value. It is proposed that the continued recalcitrance of compound #22, and hence SNFC in effluents, was due to maintenance of the integrity of the polymeric structure, even after extensive photo-Fenton treatment. Depolymerisation of SNFC will therefore be a prerequisite to their biodegradation.
Spinor domain wall and test fermions on an arbitrary domain wall
Creators: name: Dzhunushaliev, Vladimir
name: Folomeev, Vladimir
name: Zholdakhmet, Dina
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We consider a spinor domain wall embedded in a five-dimensional spacetime with a nondiagonal metric. The corresponding plane symmetric solutions for linear and nonlinear spinor fields with different parameters are obtained. It is shown that in the general case the metric functions and spinor fields do not possess $Z_2$ symmetry with respect to the domain wall. We study the angular momentum density of the domain wall arising because of the presence of the spinor field creating the wall. The properties of test fermions located on an arbitrary domain wall are considered. The concepts of the ``second spin'' (arising due to the properties of the Lorentz group generators in a five-dimensional spacetime) and of the ``second magnetic field'' (representing the components $F_{i 5}$ of the electromagnetic field five-tensor) are introduced. We find eigenspinors of the ``second spin'' and show that some of them represent the Bell states. In the nonrelativistic limit we derive the Pauli equation for the test fermions on the domain wall which contains an extra term describing the interaction of a spin-$1/2$ particle with the ``second magnetic field''; this allows the possibility of an experimental verification of the existence of extra dimensions.
description: 18 pages, 4 figures, minor corrections to content, version published in EPJC
The Role of Chd3 in Murine Cortical Development
Creators: name: Schoeppe, Anneka
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 2023
Subjects: Snijders Blok-Campeau syndrome
cortical development
CHD3
SNIBCPS

description: The nucleosome remodeling and deacetylase (NuRD) complex makes use of Chromodomain Helicase DNA binding protein 3 (CHD3) to remodel chromatin. Of the three CHD proteins NuRD may incorporate (CHD3/4/5); the function of CHD3 within the brain is the only one to have not been studied through gene knockout. Chd3 mutations in humans cause a neurodevelopmental disorder (SNIBCPS) characterized by intellect and speech deficits, but limited work has been done to describe a phenotype in mice. We have generated mice with forebrain specific deletion of Chd3 to characterize its impact on embryonic and postnatal cortical development. To analyze the consequence of Chd3 ablation on cortical lamination, layer-specific staining was performed and showed a decreased number of cells in layers II-IV. Neuronal birthdating has demonstrated that this is due to a defect in migration, causing the cells to be retained in the lower layers. Behaviour testing has also indicated defect in fear learning and memory in heterozygote males. These initial indications of defects in cortical development and behavioural deficits in the Chd3 mutant mice suggest that the animals are a good first model of the SNIBCP syndrome.
A Graph-based Optimization Framework for Hand-Eye Calibration for Multi-Camera Setups
Creators: name: Evangelista, Daniele
name: Olivastri, Emilio
name: Allegro, Davide
name: Menegatti, Emanuele
name: Pretto, Alberto
Publisher: name: arXiv
Year: 2023
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Hand-eye calibration is the problem of estimating the spatial transformation between a reference frame, usually the base of a robot arm or its gripper, and the reference frame of one or multiple cameras. Generally, this calibration is solved as a non-linear optimization problem, what instead is rarely done is to exploit the underlying graph structure of the problem itself. Actually, the problem of hand-eye calibration can be seen as an instance of the Simultaneous Localization and Mapping (SLAM) problem. Inspired by this fact, in this work we present a pose-graph approach to the hand-eye calibration problem that extends a recent state-of-the-art solution in two different ways: i) by formulating the solution to eye-on-base setups with one camera; ii) by covering multi-camera robotic setups. The proposed approach has been validated in simulation against standard hand-eye calibration methods. Moreover, a real application is shown. In both scenarios, the proposed approach overcomes all alternative methods. We release with this paper an open-source implementation of our graph-based optimization framework for multi-camera setups.
description: This paper has been accepted for publication at the 2023 IEEE International Conference on Robotics and Automation (ICRA)
Current-driven dynamics and ratchet effect of skyrmion bubbles in a ferrimagnetic insulator
Creators: name: Vélez, Saül
name: Ruiz-Gómez, Sandra
name: Schaab, Jakob
name: Gradauskaite, Elzbieta
name: Wörnle, Martin S.
name: Welter, Pol
name: Jacot, Benjamin J.
name: Degen, Christian L.
name: Trassin, Morgan
name: Fiebig, Manfred
name: Gambardella, Pietro
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Magnetic skyrmions are compact chiral spin textures that exhibit a rich variety of topological phenomena and hold potential for developing high-density memory devices and novel computing schemes driven by spin currents. Here, we demonstrate room temperature interfacial stabilization and current-driven control of skyrmion bubbles in the ferrimagnetic insulator Tm3Fe5O12 (TmIG) coupled to Pt. We track the current-induced motion of individual skyrmion bubbles. The ferrimagnetic order of the crystal together with the interplay of spin-orbit torques and pinning determine the skyrmion dynamics in TmIG and result in a strong skyrmion Hall effect characterized by a negative deflection angle and hopping motion. Further, we show that the velocity and depinning threshold of the skyrmion bubbles can be modified by exchange coupling TmIG to an in-plane magnetized Y3Fe5O12 layer, which distorts the spin texture of the skyrmions and leads to a directional-dependent rectification of their dynamics. This effect, which is equivalent to a magnetic ratchet, is exploited to control the skyrmion flow in a racetrack-like device.
description: 52 pages, 24 figures (manuscript, extended data and supplementary information)
Emergent topological quantum orbits in the charge density wave phase of kagome metal CsV$_3$Sb$_5$
Creators: name: Tan, Hengxin
name: Li, Yongkang
name: Liu, Yizhou
name: Kaplan, Daniel
name: Wang, Ziqiang
name: Yan, Binghai
Publisher: name: arXiv
Year: 2023
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The recently discovered kagome materials $A$V$_3$Sb$_5$ ($A$ = K, Rb, Cs) attract intense research interest in intertwined topology, superconductivity, and charge density waves (CDW). Although the in-plane $2\times2$ CDW is well studied, its out-of-plane structural correlation with the Fermi surface properties is less understood. In this work, we advance the theoretical description of quantum oscillations and investigate the Fermi surface properties in the three-dimensional CDW phase of CsV$_3$Sb$_5$. We derived Fermi-energy-resolved and layer-resolved quantum orbits that agree quantitatively with recent experiments in the fundamental frequency, cyclotron mass, and topology. We reveal a complex Dirac nodal network that would lead to a $π$ Berry phase of a quantum orbit in the spinless case. However, the phase shift of topological quantum orbits is contributed by the orbital moment and Zeeman effect besides the Berry phase in the presence of spin-orbital coupling (SOC). Therefore, we can observe topological quantum orbits with a $π$ phase shift in otherwise trivial orbits without SOC, contrary to common perception. Our work reveals the rich topological nature of kagome materials and paves a path to resolve different topological origins of quantum orbits.
description: The Supplementary is available at the end of the main text
Estimating the effects of water-induced shallow landslides on soil erosion
Creators: name: Bosco, Claudio
name: Sander, Graham
Publisher: name: arXiv
Year: 2015
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: FOS: Computer and information sciences

description: Rainfall induced landslides and soil erosion are part of a complex system of multiple interacting processes, and both are capable of significantly affecting sediment budgets. These sediment mass movements also have the potential to significantly impact on a broad network of ecosystems health, functionality and the services they provide. To support the integrated assessment of these processes it is necessary to develop reliable modelling architectures. This paper proposes a semi-quantitative integrated methodology for a robust assessment of soil erosion rates in data poor regions affected by landslide activity. It combines heuristic, empirical and probabilistic approaches. This proposed methodology is based on the geospatial semantic array programming paradigm and has been implemented on a catchment scale methodology using Geographic Information Systems (GIS) spatial analysis tools and GNU Octave. The integrated data-transformation model relies on a modular architecture, where the information flow among modules is constrained by semantic checks. In order to improve computational reproducibility, the geospatial data transformations implemented in ESRI ArcGis are made available in the free software GRASS GIS. The proposed modelling architecture is flexible enough for future transdisciplinary scenario analysis to be more easily designed. In particular, the architecture might contribute as a novel component to simplify future integrated analyses of the potential impact of wildfires or vegetation types and distributions, on sediment transport from water induced landslides and erosion.
description: 14 pages, 4 figures, 1 table, published in IEEE Earthzine 2014 Vol. 7 Issue 2, 910137+ 2nd quarter theme. Geospatial Semantic Array Programming. Available: http://www.earthzine.org/?p=910137
Accurate determination of band tail properties in amorphous semiconductor thin film with Kelvin Probe Force Microscopy
Creators: name: Fabbri, Luca
name: Bordoni, Camilla
name: Barquinha, Pedro
name: Crocco, Jerome
name: Fraboni, Beatrice
name: Cramer, Tobias
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Amorphous oxide semiconductors are receiving significant attention due to their relevance for large area electronics. Their disordered microscopic structure causes the formation of band tails in the density of states (DOS) that strongly affect charge transport properties. Bandtail properties are crucial to understand for optimizing thin film device performance. Among the available techniques to measure the DOS, KPFM is exceptional as it enables precise local electronic investigations combined with microscopic imaging. However, a model to interpret KPFM spectroscopy data on amorphous semiconductors of finite thickness is lacking. To address this issue, we provide an analytical solution to the Poisson's equation for a metal-insulator-semiconductor (MIS) junction interacting with the AFM tip. The solution enables us to fit experimental data for semiconductors with finite thickness and obtain the DOS parameters, such as band tail width (E_t), doping density (N_D), and flat band potential. To demonstrate our method, we perform KPFM experiments on Indium-Gallium-Zinc Oxide (IGZO) thin film transistors (IGZO-TFTs). DOS parameters compare well to values obtained with photocurrent spectroscopy. We demonstrate the potentials of the developed method by investigating the impact of ionizing radiation on DOS parameters and TFT performance. Our results provide clear evidence that the observed shift in threshold voltage is caused by static charge in the gate dielectric leading to a shift in flat band potential. Band-tails and doping density are not affected by the radiation. The developed methodology can be easily translated to different semiconductor materials and paves the way towards quantitative microscopic mapping of local DOS parameters in thin film devices.
Where are the missing symbiotic stars? Uncovering hidden Symbiotic Stars in public catalogues
Creators: name: Akras, Stavros
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Theoretical predictions of the population of Galactic symbiotic stars (SySts) are highly inconsistent with the current known population. Despite intense effort over the past decades, observations are still far below the predictions. The majority of known SySts so far are identified based on selection criteria established in the optical regime. The recent discovery of SU Lyn with very faint optical emission lines uncloaked a subgroup of SySts with accreting-only white dwarfs. In this particular case, the luminous red giant may overshadow the dimmed white dwarf companion. A new approach to search for this subgroup of SySts is presented, employing GALEX UV and 2MASS/AllWISE IR photometry. The FUV-NUV colour index is an indicator, direct or indirect, for the presence of hot compact companions. The cross-match of the Catalogue of Variable Stars III obtained from the All-Sky Automated Survey for SuperNovae with the GALEX, 2MASS and AllWISE catalogues result in a sample of 814 potential SySt candidates. From them, 105 sources have photometric measurements from both FUV and NUV bands and 35 exhibit FUV-NUV<1, similar to what it is expected from known SySts. Five known SySts are recovered, while two new genuine SySts are discovered in spectroscopic follow-up observations after the detection of the typical emission lines.
description: 11 pages, 5 figures, 1 table, accepted for Publication in MNRAS
Generalized counter-rotating oscillators: Mixed synchronization
Creators: name: Bhowmick, Sourav K.
name: Bera, Bidesh K.
name: Ghosh, Dibakar
Publisher: name: arXiv
Year: 2014
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: In this paper, we report mixed synchronization between two counter rotating chaotic oscillators. We describe a procedure how to obtain a counter rotating oscillator for generalized oscillators. We elaborate the method with numerical examples of the Sprott system, Pikovsky-Rabinovich (PR) circuit model. Noise-induced mixed synchronization is also reported in PR circuit model. The physical realization of mixed synchronization in an electronic circuit of two counters-rotating Sprott systems also shown.
description: 15 pages(single column), 9 figures
Entanglement as the cross-symmetric part of quantum discord
Creators: name: Xiong, Chunhe
name: Kim, Sunho
name: Kumar, Asutosh
name: Chen, Zeyu
name: Wu, Minghui
name: Wu, Junde
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this paper, we show that the minimal quantum discord over "cross-symmetric" state extensions is an entanglement monotone. In particular, we show that the minimal Bures distance of discord over cross-symmetric extensions is equivalent to the Bures distance of entanglement. At last, we refute a long-held but unstated convention that only contractive distances can be used to construct entanglement monotones by showing that the entanglement quantifier induced by the Hilbert-Schmidt distance, which is not contractive under quantum operations, is also an entanglement monotone.
description: 9 pages, 1 figure. arXiv admin note: text overlap with arXiv:2012.03835
Perturbation theory and harmonic gauge propagation in general relativity, a particular example
Creators: name: Martín, J.
name: Molina, A.
name: Ruiz, E.
Publisher: name: arXiv
Year: 2015
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study how the changes of coordinates between the class of harmonic coordinates affect the analitycal solutions of Einstein's equations and we apply it to an analytical approach for stationary and axisymmetric solutions of Einstein equation used by the authors \cite{cmmr}, \cite{cugmmr} to solve the problem of a self-gravitating rigidly rotating perfect fluid compact source.
description: 19 pages, 0 figures
A hot terrestrial planet orbiting the bright M dwarf L 168-9 unveiled by TESS
Creators: name: Jenkins, J.M.
name: Díaz, R.F.
name: Espinoza, N.
name: Hart, R.
name: Mann, A.W.
name: Isopi, G.
name: Figueira, P.
name: Bouchy, F.
name: Zhou, G.
name: Butler, R.P.
name: Brahm, R.
name: Hellier, C.
name: Ziegler, C.
name: Villasenor, J.
name: Mignon, L.
name: Crossfield, I.J.M.
name: Santos, N.C.
name: Henning, T.
name: Jenkins, J.S.
name: Dragomir, D.
name: Feng, F.
name: Collins, K.A.
name: Charbonneau, D
name: Udry, S.
name: Shporer, A.
name: Shectman, S.
name: Essack, Z.
name: Glidden, A.
name: Astudillo-Defru, N.
name: Delfosse, X.
name: Crane, J.
name: Jordán, A.
name: Relles, H.M.
name: Winn, J.N.
name: Nusdeo, D.A.
name: Lovis, C.
name: Smith, J.C.
name: Almenara, J.M.
name: Eastman, J.D.
name: Seager, S.
name: Ricker, G.
name: Conti, D.M.
name: Teske, J.
name: Briceño, C.
name: Melo, C.
name: Vanderspek, R.
name: Mennickent, R.E.
name: Horch, E.P.
name: Latham, D.
name: Artigau, E.
name: Doyon, R.
name: Kielkopf, J.F.
name: Guerrero, N.
name: Law, N.
name: Wang, S.X.
name: Gan, T.
name: Anderson, D.R.
name: Winters, J.G.
name: Murgas, F.
name: Pepe, F.
name: Bonfils, X.
name: Forveille, T.
name: Rose, M.
name: Ségransan, D.
name: De Medeiros, J.R.
name: Stassun, K.G.
name: Davies, M.
name: Torres, P.
name: Mallia, F.
name: Cloutier, R.
Publisher: name: EDP Sciences
Year: 2020

description: We report the detection of a transiting super-Earth-sized planet (R = 1.39 ± 0.09 R⊕ ) in a 1.4-day orbit around L 168-9 (TOI-134), a bright M1V dwarf (V = 11, K = 7.1) located at 25.15 ± 0.02 pc. The host star was observed in the first sector of the Transiting Exoplanet Survey Satellite (TESS) mission. For confirmation and planet mass measurement purposes, this was followed up with ground-based photometry, seeing-limited and high-resolution imaging, and precise radial velocity (PRV) observations using the HARPS and Magellan/PFS spectrographs. By combining the TESS data and PRV observations, we find the mass of L 168-9 b to be 4.60 ± 0.56 M⊕ and thus the bulk density to be 1.74-0.33+0.44 times higher than that of the Earth. The orbital eccentricity is smaller than 0.21 (95% confidence). This planet is a level one candidate for the TESS mission's scientific objective of measuring the masses of 50 small planets, and it is one of the most observationally accessible terrestrial planets for future atmospheric characterization.
Towards scalable nano-engineering of graphene
Creators: name: Martínez-Galera, A. J.
name: Brihuega, I.
name: Gutiérrez-Rubio, A.
name: Stauber, T.
name: Gómez-Rodríguez, J. M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: By merging bottom-up and top-down strategies we tailor graphene's electronic properties within nanometer accuracy, which opens up the possibility to design optical and plasmonic circuitries at will. In a first step, graphene electronic properties are macroscopically modified exploiting the periodic potential generated by the self assembly of metal cluster superlattices on a graphene/Ir(111) surface. We then demonstrate that individual metal clusters can be selectively removed by a STM tip with perfect reproducibility and that the structures so created are stable even at room temperature. This enables one to nanopattern circuits down to the 2.5 nm only limited by the periodicity of the Moiré-pattern, i.e., by the distance between neighbouring clusters, and different electronic and optical properties should prevail in the covered and uncovered regions. The method can be carried out on micro-meter-sized regions with clusters of different materials permitting to tune the strength of the periodic potential.
Evryscope-south survey of upper-and pre-main sequence solar neighborhood stars
Creators: name: Soto, A.V.
name: Law, N.M.
name: Galliher, N.W.
name: Gonzalez, R.
name: Howard, W.S.
name: Ratzloff, J.K.
name: Glazier, A.L.
name: Corbett, H.
Publisher: name: IOP Publishing Ltd
Year: 2020

description: Using photometric data collected by Evryscope-South, we search for nearby young variable systems on the upper main sequence (UMS) and pre-main sequence (PMS). The Evryscopes are all-sky high-cadence telescope arrays operating in the Northern and Southern hemispheres. We base our search on a Gaia-selected catalog of young neighborhood upper-and pre-main sequence stars which were chosen through both astrometric and photometric criteria. We analyze 44,971 Evryscope-South light curves in search of variability. We recover 615 variables, with 378 previously known, and 237 new discoveries including 84 young eclipsing binaries (EB) candidates. We discover a new highly eccentric binary system and recover a further four previously known systems, with periods ranging from 299 to 674 hr. We find 158 long-period (>50 hr) candidate EB systems, 9 from the PMS and 149 from the UMS, which will allow constraints on the mass/radius/age relation. These long-period EBs include a 179.3 hr PMS system and a 867.8 hr system from the UMS. For PMS variable candidates we estimate system ages, which range from 1 to 23 Myr for non-EBs and from 2 to 17 Myr for EBs. Other non-EB discoveries that show intrinsic variability will allow relationships between stellar rotation rates, ages, activity, and mass to be characterized.
Dissipative preparation and stabilization of many-body quantum states in a superconducting qutrit array
Creators: name: Wang, Yunzhao
name: Snizhko, Kyrylo
name: Romito, Alessandro
name: Gefen, Yuval
name: Murch, Kater
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We present and analyze a protocol for driven-dissipatively preparing and stabilizing a manifold of quantum manybody entangled states with symmetry-protected topological order. Specifically, we consider the experimental platform consisting of superconducting transmon circuits and linear microwave resonators. We perform theoretical modeling of this platform via pulse-level simulations based on physical features of real devices. In our protocol, transmon qutrits are mapped onto spin-1 systems. The qutrits' sharing of nearest-neighbor dispersive coupling to a dissipative microwave resonator enables elimination of state population in the $S^\mathrm{total}=2$ subspace for each adjacent pair, and thus, the stabilization of the manybody system into the Affleck, Kennedy, Lieb, and Tasaki (AKLT) state up to the edge mode configuration. We also analyze the performance of our protocol as the system size scales up to four qutrits, in terms of its fidelity as well as the stabilization time. Our work shows the capacity of driven-dissipative superconducting cQED systems to host robust and self-corrected quantum manybody states that are topologically non-trivial.
description: 19 pages, 12 figures
Supplemental Material for Paulsmeyer, Brown, and Juvik, 2018
Creators: name: Paulsmeyer, Michael
name: Brown, Patrick J.
name: Juvik, John A.
Publisher: name: Figshare
Year: 2018
Subjects: subject: 60408 Genomics
subject: FOS: Biological sciences

description: Figures S1-S3 of the article Discovery of Anthocyanin Acyltransferase1 (AAT1) in maize using genotyping-by-sequencing (GBS) in G3.
Efficient Pricing and Hedging of High Dimensional American Options Using Recurrent Networks
Creators: name: Na, Andrew
name: Wan, Justin
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mathematical Finance (q-fin.MF)
subject: Machine Learning (cs.LG)
subject: FOS: Economics and business
subject: FOS: Computer and information sciences

description: We propose a deep Recurrent neural network (RNN) framework for computing prices and deltas of American options in high dimensions. Our proposed framework uses two deep RNNs, where one network learns the price and the other learns the delta of the option for each timestep. Our proposed framework yields prices and deltas for the entire spacetime, not only at a given point (e.g. t = 0). The computational cost of the proposed approach is linear in time, which improves on the quadratic time seen for feedforward networks that price American options. The computational memory cost of our method is constant in memory, which is an improvement over the linear memory costs seen in feedforward networks. Our numerical simulations demonstrate these contributions, and show that the proposed deep RNN framework is computationally more efficient than traditional feedforward neural network frameworks in time and memory.
Invited review: Clogging of granular materials in bottlenecks
Creators: name: Zuriguel, Iker
Publisher: name: arXiv
Year: 2014
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: During the past decades, notable improvements have been achieved in the understanding of static and dynamic properties of granular materials, giving rise to appealing new concepts like jamming, force chains, non-local rheology or the inertial number. The `saltcellar' can be seen as a canonical example of the characteristic features displayed by granular materials: an apparently smooth flow is interrupted by the formation of a mesoscopic structure (arch) above the outlet that causes a quick dissipation of all the kinetic energy within the system. In this manuscript, I will give an overview of this field paying special attention to the features of statistical distributions appearing in the clogging and unclogging processes. These distributions are essential to understand the problem and allow subsequent study of topics such as the influence of particle shape, the structure of the clogging arches and the possible existence of a critical outlet size above which the outpouring will never stop. I shall finally offer some hints about general ideas that can be explored in the next few years.
description: 13 pages, 7 figures
Cluster Difference Imaging Photometric Survey. II. TOI 837: A Young Validated Planet in IC 2602
Creators: name: Ziegler, C.
name: Jenkins, J.M.
name: Winn, J.N.
name: Henning, T.
name: Seager, S.
name: Sarkis, P.
name: Marie-Sainte, W.
name: Dragomir, D.
name: Wohler, B.
name: Bakos, G.
name: Hartman, J.D.
name: Bhatti, W.
name: Dransfield, G.
name: Law, N.
name: Ricker, G.R.
name: Stassun, K.G.
name: Burke, C.J.
name: Mékarnia, D.
name: Levine, A.M.
name: Tinney, C.G.
name: Rodriguez, J.E.
name: Nandakumar, S.
name: Crouzet, N.
name: De Leon, J.
name: Bergmann, C.
name: Livingston, J.
name: Abe, L.
name: Guillot, T.
name: Quinn, S.N.
name: Vanderspek, R.
name: Vines, J.I.
name: Barbieri, M.
name: Jordán, A.
name: Quintana, E.V.
name: Vuckovic, M.
name: Bouma, L.G.
name: Zhou, G.
name: Brahm, R.
name: Smith, J.C.
name: Trifonov, T.
name: Triaud, A.H.M.J.
name: Espinoza, N.
name: Mann, A.W.
name: Collins, K.A.
name: Evans, P.
Publisher: name: IOP Publishing Ltd
Year: 2020

description: We report the discovery of TOI 837b and its validation as a transiting planet. We characterize the system using data from the NASA Transiting Exoplanet Survey Satellite mission, the ESA Gaia mission, ground-based photometry from El Sauce and ASTEP400, and spectroscopy from CHIRON, FEROS, and Veloce. We find that TOI 837 is a T = 9.9 mag G0/F9 dwarf in the southern open cluster IC 2602. The star and planet are therefore million years old. Combining the transit photometry with a prior on the stellar parameters derived from the cluster color-magnitude diagram, we find that the planet has an orbital period of and is slightly smaller than Jupiter. From radial velocity monitoring, we limit to less than 1.20 M Jup (3σ). The transits either graze or nearly graze the stellar limb. Grazing transits are a cause for concern, as they are often indicative of astrophysical false-positive scenarios. Our follow-up data show that such scenarios are unlikely. Our combined multicolor photometry, high-resolution imaging, and radial velocities rule out hierarchical eclipsing binary scenarios. Background eclipsing binary scenarios, though limited by speckle imaging, remain a 0.2% possibility. TOI 837b is therefore a validated adolescent exoplanet. The planetary nature of the system can be confirmed or refuted through observations of the stellar obliquity and the planetary mass. Such observations may also improve our understanding of how the physical and orbital properties of exoplanets change in time.
Enhanced spin-orbit coupling in core/shell nanowires
Creators: name: Bougeard, Dominique
name: Furthmeier, Stephan
name: Dirnberger, Florian
name: Gmitra, Martin
name: Bayer, Andreas
name: Forsch, Moritz
name: Hubmann, Joachim
name: Schüller, Christian
name: Reiger, Elisabeth
name: Fabian, Jaroslav
name: Korn, Tobias
Publisher: name: Universität Regensburg
Year: 2016
Subjects: subject: TOPOLOGICAL INSULATORS; SEMICONDUCTOR NANOWIRE; WURTZITE STRUCTURE; MAJORANA FERMIONS; SELECTION-RULES; GAAS NANOWIRES; BAND; HETEROSTRUCTURES; INTERFACE; ELECTRONS;
subject: 530 Physik

description: The spin-orbit coupling (SOC) in semiconductors is strongly influenced by structural asymmetries, as prominently observed in bulk crystal structures that lack inversion symmetry. Here we study an additional effect on the SOC: the asymmetry induced by the large interface area between a nanowire core and its surrounding shell. Our experiments on purely wurtzite GaAs/AlGaAs core/shell nanowires demonstrate optical spin injection into a single free-standing nanowire and determine the effective electron g-factor of the hexagonal GaAs wurtzite phase. The spin relaxation is highly anisotropic in time-resolved micro-photoluminescence measurements on single nanowires, showing a significant increase of spin relaxation in external magnetic fields. This behaviour is counterintuitive compared with bulk wurtzite crystals. We present a model for the observed electron spin dynamics highlighting the dominant role of the interface-induced SOC in these core/shell nanowires. This enhanced SOC may represent an interesting tuning parameter for the implementation of spin-orbitronic concepts in semiconductor-based structures.
TOI 564 b and TOI 905 b: Grazing and Fully Transiting Hot Jupiters Discovered by TESS
Creators: name: Morris, R.
name: Dynes, S.
name: Briceno, C.
name: Ziegler, C.
name: Shahaf, S.
name: Winn, J.N.
name: Millholland, S.
name: Lewin, P.
name: Trifonov, T.
name: Paredes, L.A.
name: Eastman, J.D.
name: Calkins, M.L.
name: Henry, T.J.
name: Ricker, G.R.
name: Palle, E.
name: Henze, C.E.
name: Wang, X.-Y.
name: Tronsgaard, R.
name: Christiansen, J.L.
name: Kane, S.R.
name: Cruz, B.
name: Radford, D.J.
name: Krishnamurthy, A.
name: Jenkins, J.M.
name: Law, N.M.
name: Davis, A.B.
name: Mazeh, T.
name: Günther, M.N.
name: Collins, K.I.
name: Hodari-Sadiki, J.
name: Esquerdo, G.A.
name: Vanderspek, R.
name: Watanabe, N.
name: Addison, B.C.
name: Batalha, N.M.
name: Caldwell, D.A.
name: Jones, M.
name: Tan, T.-G.
name: Stassun, K.G.
name: Narita, N.
name: Fischer, D.A.
name: Conti, D.M.
name: Latham, D.W.
name: Seager, S.
name: Mann, A.W.
name: Quinn, S.N.
name: Colón, K.D.
name: Burt, J.
name: Parviainen, H.
name: Tokovinin, A.
name: Ciardi, D.R.
name: Collins, K.A.
name: Evans, P.
name: Murgas, F.
name: Wang, S.
name: Berlind, P.
name: Lund, M.B.
Publisher: name: IOP Publishing Ltd
Year: 2020

description: We report the discovery and confirmation of two new hot Jupiters discovered by the Transiting Exoplanet Survey Satellite (TESS): TOI 564 b and TOI 905 b. The transits of these two planets were initially observed by TESS with orbital periods of 1.651 and 3.739 days, respectively. We conducted follow-up observations of each system from the ground, including photometry in multiple filters, speckle interferometry, and radial velocity measurements. For TOI 564 b, our global fitting revealed a classical hot Jupiter with a mass of MJ and a radius of RJ. Also a classical hot Jupiter, TOI 905 b has a mass of MJ and radius of RJ. Both planets orbit Sun-like, moderately bright, mid-G dwarf stars with V ∼ 11. While TOI 905 b fully transits its star, we found that TOI 564 b has a very high transit impact parameter of, making it one of only ∼20 known systems to exhibit a grazing transit and one of the brightest host stars among them. Therefore, TOI 564 b is one of the most attractive systems to search for additional nontransiting, smaller planets by exploiting the sensitivity of grazing transits to small changes in inclination and transit duration over a timescale of several years.
Open access decision support for sustainable buildings and neighborhoods: The nano energy system simulator NESSI
Creators: name: Eckhoff, Sarah
name: Hart, Maria C.G.
name: Brauner, Tim
name: Kraschewski, Tobias
name: Heumann, Maximilian
name: Breitner, Michael H.
Publisher: name: New York, NY [u.a.] : Elsevier
Year: 2023
Subjects: subject: Decision support system
subject: Design science research
subject: Energy system simulation
subject: Open access web tool
subject: Renewable energy
subject: Dewey Decimal Classification::600 | Technik::690 | Hausbau, Bauhandwerk

description: The urgency of climate change mitigation, rising energy prices and geopolitical crises make a quick and efficient energy transition in the building sector imperative. Building owners, housing associations, and local governments need support in the complex task to build sustainable energy systems. Motivated by the calls for more solution-oriented, practice-focused research regarding climate change and guided by design science research principles, we address this need and design, develop, and evaluate the web-based decision support system NESSI. NESSI is an open-access energy system simulator with an intuitive user flow to facilitate multi-energy planning for buildings and neighborhoods. It calculates the technical, environmental, and economic effects of 14 energy-producing, consuming, and storing components of the electric and thermal infrastructure, considers time-dependent effects, and accounts for geographic as well as sectoral circumstances. Its applicability is demonstrated with the case of a single-family home in Hannover, Germany, and evaluated through twelve expert interviews.
Stress concentration factors in FRP-reinforced tubular DKT joints under axial loads
Creators: name: Zavvar, E.
name: Henneberg, J.
name: Guedes Soares, C.
Publisher: name: Amsterdam [u.a.] : Elsevier Science
Year: 2023
Subjects: subject: Axial loads
subject: Fibre-reinforced polymer
subject: Stress concentration factor
subject: Uniplanar DKT-Joints
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie::380 | Handel, Kommunikation, Verkehr

description: The stress concentration factors (SCFs) in uniplanar fibre-reinforced polymer (FRP) DKT joints are calculated under five axial loading conditions to determine the maximum SCFs. To this end, 108 finite element models of reinforced DKT joints with different FRPs and geometrical parameters are analysed. Available experimental data and formulas are used to validate the finite element models. The validated finite element models are utilized to investigate the effects of the FRP parameters along with different geometrical parameters on the stress concentration factors in uniplanar DKT joints. The simulations show a reduction of the maximum SCF by around 40% compared to unreinforced DKT joints. The reduction effect increases significantly with increasing the FRP thickness and the number of layers. Despite the notable efficacy of the FRP sheets on the drop of the SCFs in the X-connections, there is not any study or equation on the X-joints with FRP. Therefore, a precise equation is proposed for quantifying the SCFs in X-connections with FRP and is checked against the UK DoE acceptance standard.
Reproducing tactile and proprioception based on the human-in-the-closed-loop conceptual approach
Creators: name: Moqadam, Saeed Bahrami
name: Delle, Knollis
name: Schorling, Ursus
name: Asheghabadi, Ahmad Saleh
name: Norouzi, Farzaneh
name: Xu, Jing
Publisher: name: New York, NY : IEEE
Year: 2023
Subjects: subject: human-in-the-closed-loop
subject: myotome
subject: neuromuscular electrical stimulation (NMES)
subject: Proprioception
subject: real-time feedback
subject: tactile feedback
subject: upper extremity amputation
subject: Dewey Decimal Classification::000 | Allgemeines, Wissenschaft::000 | Informatik, Wissen, Systeme::004 | Informatik
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau::621 | Angewandte Physik::621,3 | Elektrotechnik, Elektronik

description: Prosthetic limb embodiment remains a significant challenge for many amputees due to traditional designs' lack of sensory feedback. To address this challenge, the effectiveness of non-invasive neuromuscular electrical stimulation (NMES) controlled by a hybrid proportional-differential (PD)-Fuzzy logic system was evaluated for providing real-time proprioception and tactile feedback. The study used a human-in-the-closed-loop approach with ten participants: five upper limb amputees and five non-disabled individuals as the control group. An applied force, the joint angle of a prosthetic hand's finger, and surface electromyography signals generated by the biceps muscle all regulate the intensity of sensory feedback. Additionally, the C6 and C7 myotomes were selected as elicitation sites. The average threshold for detecting action motion and force was around 21° and 1.524N, respectively. The participants successfully reproduced desired joint angles within the range of 0°-110° at five separate intervals. In the weight recognition experiment, the amputee participant's minimum number of false predictions was four. The highest accuracy achieved was 80.66% in detecting object size and stiffness. Additionally, unpaired t-tests were performed for the means of the results of the experiments to determine statistically significant differences between groups. The results suggest that stimulation of myotomes by NMES is an effective non-invasive method for delivering rich multimodal sensation information to individuals with disabilities, including upper limb amputees, without needing visual or auditory cues. These findings contribute to the development of non-invasive sensory substitution in prostheses.
Holographic Operator Product Expansion of Loop Operators in $\mathcal{N}=4$ $SO(N)$ Super Yang-Mills Theory
Creators: name: Zhang, Hong-Zhe
name: Feng, Wan-Zhe
name: Wu, Jun-Bao
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper, we compute the correlation functions of Wilson(-'t~Hooft) loops with chiral primary operators in $\mathcal{N}=4$ supersymmetric Yang-Mills theory with $SO(N)$ gauge symmetry, which has a holographic dual description of Type IIB superstring theory on the $AdS_{5}\times\mathbf{RP}^{5}$ background. Specifically, we compute the coefficients of the chiral primary operators in the operator product expansion of Wilson loops in the fundamental representation, Wilson-'t Hooft loops in the symmetric representation, Wilson loops in the anti-fundamental representation and the spinor representation. We also compare these results to the $\mathcal{N}=4$ $SU(N)$ super Yang-Mills theory.
description: v2, 22 pages, no figures, comparing with results in the case of gauge group SU(N) added, other minor reversion performed; v1, 20 pages, no figures
Strongly far proximity and hyperspace topology
Creators: name: Peters, J. F.
name: Guadagni, C.
Publisher: name: arXiv
Year: 2015
Subjects: subject: General Topology (math.GN)
subject: FOS: Mathematics
subject: 54E05, 54B20

description: This article introduces strongly far proximity, which is associated with Lodato proximity $δ$. A main result in this paper is the introduction of a hit-and-miss topology on $\mbox{CL}(X)$, the hyperspace of nonempty closed subsets of $X$, based on the strongly far proximity.
description: 6 pages, 1 figure