cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Rule Mining over Knowledge Graphs via Reinforcement Learning
Creators: name: Chen, Lihan
name: Jiang, Sihang
name: Liu, Jingping
name: Wang, Chao
name: Zhang, Sheng
name: Xie, Chenhao
name: Liang, Jiaqing
name: Xiao, Yanghua
name: Song, Rui
Publisher: name: arXiv
Year: 2022
Subjects: subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Knowledge graphs (KGs) are an important source repository for a wide range of applications and rule mining from KGs recently attracts wide research interest in the KG-related research community. Many solutions have been proposed for the rule mining from large-scale KGs, which however are limited in the inefficiency of rule generation and ineffectiveness of rule evaluation. To solve these problems, in this paper we propose a generation-then-evaluation rule mining approach guided by reinforcement learning. Specifically, a two-phased framework is designed. The first phase aims to train a reinforcement learning agent for rule generation from KGs, and the second is to utilize the value function of the agent to guide the step-by-step rule generation. We conduct extensive experiments on several datasets and the results prove that our rule mining solution achieves state-of-the-art performance in terms of efficiency and effectiveness.
description: Knowledge-Based Systems
AceWiki: A Natural and Expressive Semantic Wiki
Creators: name: Kuhn, Tobias
Publisher: name: arXiv
Year: 2008
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences
subject: H.5.2; I.2.4

description: We present AceWiki, a prototype of a new kind of semantic wiki using the controlled natural language Attempto Controlled English (ACE) for representing its content. ACE is a subset of English with a restricted grammar and a formal semantics. The use of ACE has two important advantages over existing semantic wikis. First, we can improve the usability and achieve a shallow learning curve. Second, ACE is more expressive than the formal languages of existing semantic wikis. Our evaluation shows that people who are not familiar with the formal foundations of the Semantic Web are able to deal with AceWiki after a very short learning phase and without the help of an expert.
description: To be published as: Proceedings of Semantic Web User Interaction at CHI 2008: Exploring HCI Challenges, CEUR Workshop Proceedings
Detecting dark matter-dark energy coupling with the halo mass function
Creators: name: Sutter, P. M.
name: Ricker, P. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We use high-resolution simulations of large-scale structure formation to analyze the effects of interacting dark matter and dark energy on the evolution of the halo mass function. Using a chi-square likelihood analysis, we find significant differences in the mass function between models of coupled dark matter-dark energy and standard concordance cosmology Lambda-CDM out to redshift z=1.5. We also find a preliminary indication that the Dark Energy Survey should be able to distinguish these models from Lambda-CDM within its mass and redshift contraints. While we can distinguish the effects of these models from Lambda-CDM cosmologies with different fundamental parameters, DES will require independent measurements of sigma-8 to confirm these effects.
description: 5 pages, 3 figures, responded to referee comments, accepted by ApJ
The spin axes orbital alignment of both stars within the eclipsing binary system V1143Cyg using the Rossiter-McLaughlin effect
Creators: name: Albrecht, S.
name: Reffert, S.
name: Snellen, I.
name: Quirrenbach, A.
name: Mitchell, D. S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Context: The Rossiter-McLaughlin (RM) effect, a rotational effect in eclipsing systems, provides unique insight into the relative orientation of stellar spin axes and orbital axes of eclipsing binary systems. Aims: Our aim is to develop a robust method to analyze the RM effect in an eclipsing system with two nearly equally bright components. This gives access to the orientation of the stellar rotation axes and may shed light on questions of binary formation and evolution. Methods: High-resolution spectra have been obtained both out of eclipse and during the primary and secondary eclipses in the V1143Cyg system, using the high-resolution Hamilton Echelle Spectrograph at the Lick Observatory. The Rossiter-McLaughlin effect is analyzed in two ways: (1) by measuring the shift of the line center of gravity during different phases of the eclipses and (2) by analysis of the line shape change of the rotational broadening function during eclipses. Results: The projected axes of both stars are aligned with the orbital spin within the observational uncertainties, with the angle of the primary rotation axis beta_p=0.3+-1.5 deg, and the angle of the secondary rotation axis beta_s=-1.2+-1.6 deg, thereby showing that the remaining difference between the theoretical and observed apsidal motion for this system is not due to a misalignment of the stellar rotation axes. Both methods utilized in this paper work very well, even at times when the broadening profiles of the two stars overlap.[abridged]
description: Accepted for publication in A&A; 11 pages, 9 figures, 3 tables ; a typo in the abstract has been corrected
Bio-based Fertilising Products: Quality, safety and alignment with EU Regulation A Joint Position Paper of the 5 RUR-08 Sister projects
Creators: name: Cartif
Publisher: name: Zenodo
Year: 2024
Subjects: BBFs
Bio-based Fertilising
WalNUT
Horizon 2020
European Union (EU)
H2020

description: Joint position of WalNUT and their sister project about the quality of bio based fertilisers (BBFs) from recycled nutrients. Available also at the project website: http://walnutproject.eu/wp-content/uploads/2024/07/H2020-projects-jont-position-paper-QUALITY-recycled-nutrients.pdf
Covariant Hamiltonian Dynamics with Negative Energy States
Creators: name: De Sanctis, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: A relativistic quantum mechanics is studied for bound hadronic systems in the framework of the Point Form Relativistic Hamiltonian Dynamics. Negative energy states are introduced taking into account the restrictions imposed by a correct definition of the Poincaré group generators. We obtain nonpathological, manifestly covariant wave equations that dynamically contain the contributions of the negative energy states. Auxiliary negative energy states are also introduced, specially for studying the interactions of the hadronic systems with external probes.
description: 42 pages, submitted to EPJA
Output Regulation of Linear Stochastic Systems
Creators: name: Mellone, Alberto
name: Scarciotti, Giordano
Publisher: name: arXiv
Year: 2021
Subjects: subject: Systems and Control (eess.SY)
subject: Optimization and Control (math.OC)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Mathematics

description: We address the output regulation problem for a general class of linear stochastic systems. Specifically, we formulate and solve the ideal full-information and output-feedback problems, obtaining perfect, but non-causal, asymptotic regulation. A characterisation of the problem solvability is deduced. We point out that the ideal problems cannot be solved in practice because they unrealistically require that the Brownian motion affecting the system is available for feedback. Drawing from the ideal solution, we formulate and solve approximate versions of the full-information and output-feedback problems, which do not yield perfect asymptotic tracking but can be solved in a realistic scenario. These solutions rely on two key ideas: first we introduce a discrete-time a-posteriori estimator of the variations of the Brownian motion obtained causally by sampling the system state or output; second we introduce a hybrid state observer and a hybrid regulator scheme which employ the estimated Brownian variations. The approximate solution tends to the ideal as the sampling period tends to zero. The proposed theory is validated by the regulation of a circuit subject to electromagnetic noise.
description: in IEEE Transactions on Automatic Control
Precision measurement of the branching ratio in the 6P3/2 decay of BaII with a single trapped ion
Creators: name: Kurz, N.
name: Dietrich, M. R.
name: Shu, Gang
name: Bowler, R.
name: Salacka, J.
name: Mirgon, V.
name: Blinov, B. B.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We present a measurement of the branching ratios from the 6P3/2 state of BaII into all dipoleallowed decay channels (6S1/2, 5D3/2 and 5D5/2). Measurements were performed on single 138Ba+ ions in a linear Paul trap with a frequency-doubled mode-locked Ti:Sapphire laser resonant with the 6S1/2->6P3/2 transition at 455 nm by detection of electron shelving into the dark 5D5/2 state. By driving a pi Rabi rotation with a single femtosecond pulse, a absolute measurement of the branching ratio to 5D5/2 state was performed. Combined with a measurement of the relative decay rates into 5D3/2 and 5D5/2 states performed with long trains of highly attenuated 455 nm pulses, it allowed the extraction of the absolute ratios of the other two decays. Relative strengths normalized to unity are found to be 0.756+/-0.046, 0.0290+/-0.0015 and 0.215+/-0.0064 for 6S1/2, 5D3/2 and 5D5/2 respectively. This approximately constitutes a threefold improvement over the best previous measurements and is a sufficient level of precision to compare to calculated values for dipole matrix elements.
description: 6 pages, 5 figures, 1 table
Discrete R-symmetry anomalies in heterotic orbifold models
Creators: name: Araki, Takeshi
name: Choi, Kang-Sin
name: Kobayashi, Tatsuo
name: Kubo, Jisuke
name: Ohki, Hiroshi
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Anomalies of discrete R-symmetries appearing in heterotic orbifold models are studied. We find that the mixed anomalies for different gauge groups satisfy the universal Green-Schwarz (GS) condition, indicating that these anomalies are canceled by the GS mechanism. An exact relation between the anomaly coefficients of the discrete R-symmetries and one-loop beta-function coefficients is obtained. We also find that the discrete R-symmetries have a good chance to be unbroken down to the supersymmetry breaking scale. Even below this scale a $Z_2$ subgroup is unbroken, which may be an origin of the R-parity of the minimal supersymmetric standard model. Relations between the R-symmetry anomalies and T-duality anomalies are also investigated.
description: 19 pages, no figure
Towards a Reference Architecture for Future Industrial Internet of Things Networks
Creators: name: Martin, Dominik
name: Kühl, Niklas
name: Schwenk, Marcel
Publisher: name: Institute of Electrical and Electronics Engineers (IEEE)
Year: 2021

description: With the continuing decrease of sensor technology prices as well as the increase of communication and analytical capabilities of modern internet of things devices, the continuously generated amount of data is constantly growing. Various use cases show the untapped potential of this data for new business models. However, conventional industrial IT networks of traditional manufacturing companies can hardly meet the modern requirements emerging with today's and future industrial internet of things applications. Outdated and rigid network infrastructures are one of the main reasons for hesitant innovation efforts and cross-organizational collaborations as well as the slow adoption of modern business models by traditional manufacturing companies. Following the design science research paradigm, our work contributes by elaborating on a comprehensive list of requirements for future industrial internet of things networks from a theoretical and practical perspective as well as a proposed reference architecture acting as a blueprint for future implementations.
Tightness-Looseness in the United States: Ecological Predictors and State Level Outcomes
Creators: name: Harrington, Jesse Ryan
Publisher: name: Digital Repository at the University of Maryland
Year: 2014
Subjects: subject: Psychology
subject: FOS: Psychology
subject: culture
subject: ecology
subject: index
subject: norms

description: This research demonstrates wide variation in tightness-looseness (strength of punishment and degree of permissiveness) at the state level in the United States, and its association with various ecological and historical factors, psychological characteristics, and state-level outcomes. Consistent with theory and past research, ecological and man-made threats--more natural disasters, greater disease prevalence, fewer natural resources, and greater external threat--predict increased tightness at the state level. Tightness is also associated with higher trait conscientiousness and lower trait openness. Compared with loose states, tight states have more social stability, indicated by lowered drug and alcohol use, lower rates of homelessness, and lower social disorganization. However, tight states also have relatively higher incarceration rates, greater discrimination and inequality, lower creativity, and lower happiness. In all, tightness-looseness provides a parsimonious explanation of the wide variation seen across the 50 states of the United States of America.
Towards a community of Open Research Champions: insight from the Cambridge Data Champion Programme
Creators: name: Jones, Sacha
Publisher: name: Apollo - University of Cambridge Repository
Year: 2019

description: This presentation is for “FAIR Science: tricky problems and creative solutions”, which took place at the Wellcome Auditorium, The Queen’s Medical Research Institute, University of Edinburgh. This one day event is organised by Ralitsa Madsen.
Gravity duals for non-relativistic CFTs
Creators: name: Balasubramanian, Koushik
name: McGreevy, John
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Other Condensed Matter (cond-mat.other)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We attempt to generalize the AdS/CFT correspondence to non-relativistic conformal field theories which are invariant under Galilean transformations. Such systems govern ultracold atoms at unitarity, nucleon scattering in some channels, and more generally, a family of universality classes of quantum critical behavior. We construct a family of metrics which realize these symmetries as isometries. They are solutions of gravity with negative cosmological constant coupled to pressureless dust. We discuss realizations of the dust, which include a bulk superconductor. We develop the holographic dictionary and compute some two-point correlators. A strange aspect of the correspondence is that the bulk geometry has two extra noncompact dimensions.
description: 12 pages; v2, v3, v4: added references, minor corrections; v3: cleaned up and generalized dust; v4: closer to published version
title: Périodisation en physiothérapie
title: connaissances et utilisation dans la pratique – étude exploratoire
titleType: Subtitle
title: Périodisation en physiothérapie
titleType: AlternativeTitle
Creators: name: Baehni, Ulysse
name: Parra, Dany
Publisher: name: Unknown
Year: 0
Subjects: subject: Périodisation
subject: Physiothérapie
subject: Enjeux pratiques
subject: Étude exploratoire
subject: Sondage
subject: hesav TB Phy

description: Introduction : La périodisation est un principe d’entraînement primordial pour la performance sportive. La littérature présente la périodisation comme un outil intéressant pour la réhabilitation en physiothérapie. Les connaissances des physiothérapeutes à ce sujet et leur utilisation du concept en sont par conséquent impactés. Objectif : L’objectif principal de ce travail de Bachelor est de réaliser une évaluation des connaissances des physiothérapeutes au sujet du concept de périodisation ainsi que de déterminer la place qu’il occupe dans la pratique physiothérapeutique. Méthodologie : La réponse à la problématique a été obtenue via la conception d’un sondage de 14 questions par les auteurs pour recueillir diverses données auprès des physiothérapeutes de Suisse romande. Le sondage englobe différents enjeux au sujet de leurs connaissances sur la périodisation et leur utilisation en pratique. Il a été envoyé le 11 janvier 2023 et clôturé le 28 février 2023. Résultats : 56 réponses ont été obtenues via le sondage. 68% des participants ne connaissaient pas le concept. Le manque de connaissances est perçu par 55% des physiothérapeutes comme une des principales barrières à son utilisation. 66% des thérapeutes, après avoir pris connaissance du concept, pensent qu’il est applicable dans leur pratique. Différentes pistes d’utilisation ont été proposées par les physiothérapeutes ainsi que les auteurs. Conclusion : Une méconnaissance du concept et de son utilisation a été mise en évidence chez les physiothérapeutes de Suisse romande via ce travail. Une implantation en pratique semblerait intéressante pour une grande majorité des thérapeutes mais elle est confrontée aux contraintes pratiques propres à la profession.
Single polaron properties of the breathing-mode Hamiltonian
Creators: name: Lau, Bayo
name: Berciu, Mona
name: Sawatzky, George A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We investigate numerically various properties of the one-dimensional (1D) breathing-mode polaron. We use an extension of a variational scheme to compute the energies and wave-functions of the two lowest-energy eigenstates for any momentum, as well as a scheme to compute directly the polaron Greens function. We contrast these results with results for the 1D Holstein polaron. In particular, we find that the crossover from a large to a small polaron is significantly sharper. Unlike for the Holstein model, at moderate and large couplings the breathing-mode polaron dispersion has non-monotonic dependence on the polaron momentum k. Neither of these aspects is revealed by a previous study based on the self-consistent Born approximation.
delta Cen: a new binary Be star detected by VLTI/AMBER spectro-interferometry
Creators: name: Meilland, Anthony
name: Millour, Florentin
name: Stee, Philippe
name: Spang, Alain
name: Petrov, R. G.
name: Bonneau, D.
name: Perraut, Karine
name: Massi, Fabrizio
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study the Be star $δ$ Cen circumstellar disk using long-baseline interferometry which is the only observing technique capable of resolving spatially and spectroscopically objects smaller than 5 mas in the H and K b and. We used the VLTI/AMBER instrument on January 6, 8, and 9, 2008, in the H and K bands to complete low (35) and medium (150 0) spectral resolution observations. We detected an oscillation in the visibility curve plotted as a function of the spatial frequency which is a clear signat ure of a companion around $δ$ Cen. Our best-fit soltution infers a binary separation of 68.7 mas, a companion flux co ntribution in the K band of about 7% of the total flux, a PA of 117.5 $\degr$, and an envelope flux around the Be primary that contributes up to about 50 % of the total flux, in agreement with our Spectral Energy Distribution (SED) fit. The e nvelope size is estimated to be 1.6 mas in K but no departure from spherical symmetry is detected.
description: Accepted by A&A
Systematic review of the impact of cannabinoids on neurobehavioral outcomes in preclinical models of traumatic and nontraumatic spinal cord injury.
Creators: name: Bhatti, Faheem I
name: Mowforth, Oliver D
name: Butler, Max B
name: Bhatti, Aniqah I
name: Adeeko, Sylva
name: Akhbari, Melika
name: Dilworth, Rory
name: Grodzinski, Ben
name: Osunronbi, Temidayo
name: Ottewell, Luke
name: Teh, Jye Quan
name: Robinson, Sophie
name: Suresh, Gayathri
name: Waheed, Unaiza
name: Walker, Benn
name: Kuhn, Isla
name: Smith, Lara
name: Bartlett, Richard D
name: Davies, Ben
name: Kotter, Mark
Publisher: name: Apollo - University of Cambridge Repository
Year: 2021

description: STUDY DESIGN: Systematic review. OBJECTIVES: To evaluate the impact of cannabinoids on neurobehavioral outcomes in preclinical models of nontraumatic and traumatic spinal cord injury (SCI), with the aim of determining suitability for clinical trials involving SCI patients. METHODS: A systematic search was performed in MEDLINE and Embase databases, following registration with PROPSERO (CRD42019149671). Studies evaluating the impact of cannabinoids (agonists or antagonists) on neurobehavioral outcomes in preclinical models of nontraumatic and traumatic SCI were included. Data extracted from relevant studies, included sample characteristics, injury model, neurobehavioural outcomes assessed and study results. PRISMA guidelines were followed and the SYRCLE checklist was used to assess risk of bias. RESULTS: The search returned 8714 studies, 19 of which met our inclusion criteria. Sample sizes ranged from 23 to 390 animals. WIN 55,212-2 (n = 6) and AM 630 (n = 8) were the most used cannabinoid receptor agonist and antagonist respectively. Acute SCI models included traumatic injury (n = 16), ischaemia/reperfusion injury (n = 2), spinal cord cryoinjury (n = 1) and spinal cord ischaemia (n = 1). Assessment tools used assessed locomotor function, pain and anxiety. Cannabinoid receptor agonists resulted in statistically significant improvement in locomotor function in 9 out of 10 studies and pain outcomes in 6 out of 6 studies. CONCLUSION: Modulation of the endo-cannabinoid system has demonstrated significant improvement in both pain and locomotor function in pre-clinical SCI models; however, the risk of bias is unclear in all studies. These results may help to contextualise future translational clinical trials investigating whether cannabinoids can improve pain and locomotor function in SCI patients.
description: NIHR Clinical Doctoral Research Fellowship.
The Detection of a Red Sequence of Massive Field Galaxies at z~2.3 and its Evolution to z~0
Creators: name: Kriek, Mariska
name: van der Wel, Arjen
name: van Dokkum, Pieter G.
name: Franx, Marijn
name: Illingworth, Garth D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The existence of massive galaxies with strongly suppressed star formation at z~2.3, identified in a previous paper, suggests that a red sequence may already be in place beyond z=2. In order to test this hypothesis, we study the rest-frame U-B color distribution of massive galaxies at 23 sigma) red sequence, which hosts ~60% of the stellar mass at the high-mass end. The red-sequence galaxies have little or no ongoing star formation, as inferred from both emission-line diagnostics and stellar continuum shapes. Their strong Balmer breaks and their location in the rest-frame U-B, B-V plane indicate that they are in a post-starburst phase, with typical ages of ~0.5-1.0 Gyr. In order to study the evolution of the red sequence, we compare our sample with spectroscopic massive galaxy samples at 0.0210^11 Msol) of the red sequence grow by factors of ~8 and ~6, respectively. We explore simple models to explain the observed evolution. Passive evolution models predict too strong d(U-B), and produce z~0 galaxies that are too red. More complicated models that include aging, galaxy transformations, and red mergers can explain both the number density and color evolution of the massive end of the red sequence between z~2.3 and the present.
description: Accepted for publication in the Astrophysical Journal
eQTLs of Rab11s isoforms across multiple healthy tissues
Creators: name: Gemperle, Jakub
Publisher: name: University of Manchester
Year: 2021
Subjects: subject: 60405 Gene Expression (incl. Microarray and other genome-wide approaches)
subject: FOS: Biological sciences

description: Computed quantitative trait loci, eQTLs, of Rab11s (Rab11a/b/25) isoforms across multiple healthy tissues. GTEX browser: https://gtexportal.org/. Non-cod. = non-coding transcript variant of protein-coding gene, CC? reflects that two C-terminal cysteine residues that anchor Rab11s to membranous compartment via geranylgeranyl groups are missing (C-terminus of protein-coding variant is truncated).
AceWiki: Collaborative Ontology Management in Controlled Natural Language
Creators: name: Kuhn, Tobias
Publisher: name: arXiv
Year: 2008
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences
subject: H.5.2; I.2.4

description: AceWiki is a prototype that shows how a semantic wiki using controlled natural language - Attempto Controlled English (ACE) in our case - can make ontology management easy for everybody. Sentences in ACE can automatically be translated into first-order logic, OWL, or SWRL. AceWiki integrates the OWL reasoner Pellet and ensures that the ontology is always consistent. Previous results have shown that people with no background in logic are able to add formal knowledge to AceWiki without being instructed or trained in advance.
Dissipative Pulsar Magnetosphere
Creators: name: Gruzinov, Andrei
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Dissipative axisymmetric pulsar magnetosphere is calculated by a direct numerical simulation of the Strong-Field Electrodynamics equations. The magnetic separatrix disappears, it is replaced by a region of enhanced dissipation. With a better numerical scheme, one should be able to calculate the bolometric lightcurves for a given conductivity.
description: 2 pages, 10 figures, minor changes for the journal
The Location of Young Pulsar PSR J0837$-$2454: Galactic Halo or Local Supernova Remnant?
Creators: name: Pol, Nihan
name: Burke-Spolaor, Sarah
name: Hurley-Walker, Natasha
name: Blumer, Harsha
name: Johnston, Simon
name: Keith, Michael
name: Keane, Evan F.
name: Burgay, Marta
name: Possenti, Andrea
name: Petroff, Emily
name: Bhat, N. D. Ramesh
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present the discovery and timing of the young (age $\sim 28.6$ kyr) pulsar PSR J0837$-$2454. Based on its high latitude ($b = 9.8^{\circ}$) and dispersion measure (DM $ = 143$~pc~cm$^{-3}$), the pulsar appears to be at a $z$-height of $>$1 kpc above the Galactic plane, but near the edge of our Galaxy. This is many times the observed scale height of the canonical pulsar population, which suggests this pulsar may have been born far out of the plane. If accurate, the young age and high $z$-height imply that this is the first pulsar known to be born from a runaway O/B star. In follow-up imaging with the Australia Telescope Compact Array (ATCA), we detect the pulsar with a flux density $S_{1400} = 0.18 \pm 0.05$ mJy. We do not detect an obvious supernova remnant around the pulsar in our ATCA data, but we detect a co-located, low-surface-brightness region of $\sim$1.5$^\circ$ extent in archival Galactic and Extragalactic All-sky MWA Survey data. We also detect co-located H$α$ emission from the Southern H$α$ Sky Survey Atlas. Distance estimates based on these two detections come out to $\sim$0.9 kpc and $\sim$0.2 kpc respectively, both of which are much smaller than the distance predicted by the NE2001 model ($6.3$ kpc) and YMW model ($>25$ kpc) and place the pulsar much closer to the plane of the Galaxy. If the pulsar/remnant association holds, this result also highlights the inherent difficulty in the classification of transients as "Galactic" (pulsar) or "extragalactic" (fast radio burst) toward the Galactic anti-center based solely on the modeled Galactic electron contribution to a detection.
description: Published in ApJ. 12 pages, 9 figures, 2 tables
Recombination fluorescence in ultracold neutral plasmas
Creators: name: Bergeson, S. D.
name: Robicheaux, F.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We present the first measurements and simulations of recombination fluorescence in ultracold neutral plasmas. In contrast with previous work, experiment and simulation are in significant disagreement. Comparison with a recombination model suggests that the disagreement could be due to the high energy portion of the electron energy distribution or to large energy changes in electron/Rydberg scattering. Recombination fluorescence opens a new diagnostic window in ultracold plasmas because it probes the deeply-bound Rydberg levels, which depend critically on electron energetics.
Thermodynamics of the R_h=ct Universe: A Simplification of Cosmic Entropy
Creators: name: Melia, Fulvio
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: In the standard model of cosmology, the Universe began its expansion with an anomalously low entropy, which then grew dramatically to much larger values consistent with the physical conditions at decoupling, roughly 380,000 years after the Big Bang. There does not appear to be a viable explanation for this `unnatural' history, other than via the generalized second law of thermodynamics (GSL), in which the entropy of the bulk, S_bulk, is combined with the entropy of the apparent (or gravitational) horizon, S_h. This is not completely satisfactory either, however, since this approach seems to require an inexplicable equilibrium between the bulk and horizon temperatures. In this paper, we explore the thermodynamics of an alternative cosmology known as the R_h=ct universe, which has thus far been highly successful in resolving many other problems or inconsistencies in LCDM. We find that S_bulk is constant in this model, eliminating the so-called initial entropy problem simply and elegantly. The GSL may still be relevant, however, principally in selecting the arrow of time, given that S_h ~ t^2 in this model.
description: 12 pages, 1 Table. Accepted for publication in EPJ-C
Electron affinity of oganesson
Creators: name: Kaygorodov, M. Y.
name: Skripnikov, L. V.
name: Tupitsyn, I. I.
name: Eliav, E.
name: Kozhedub, Y. S.
name: Malyshev, A. V.
name: Oleynichenko, A. V.
name: Shabaev, V. M.
name: Titov, A. V.
name: Zaitsevskii, A. V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The electron affinity (EA) of superheavy element Og is calculated by the use of the relativistic Fock-space coupled cluster (FSCC) and configuration interaction methods. The FSCC cluster operator expansion included single, double, and triple excitations treated in a non-perturbative manner. The Gaunt and retardation electron-electron interactions are taken into account. Both methods yield the results that are in agreement with each other. The quantum electrodynamics correction to EA is evaluated using the model Lamb-shift operator approach. The electron affinity of Og is obtained to be 0.076(4) eV.
description: 11 pages, 5 tables, 3 figures
Optimizing Coherence Suppression in a Laser Broadened by Phase Modulation with Noise
Creators: name: Wheeler, Jonathan M.
name: Chamoun, Jacob N.
name: Digonnet, Michel J. F.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Phase noise can be modulated onto the output of a laser with an electro-optic phase modulator (EOM) to create a highly incoherent broadened source with low intensity noise. This technique leaves a small but finite fraction of the coherent carrier power that can be highly detrimental in applications requiring incoherent light. This paper shows that the carrier suppression in a laser broadened by this technique can be calculated for an arbitrary noise probability density function. The carrier suppression can be varied experimentally by adjusting the noise voltage standard deviation $Gv_σ$ and saturation voltage $V_{sat}$ of the amplifier that amplifies the noise source that drives the EOM. Simulations show that suppressions better than -30 dB are attainable for reasonable tolerances in $Gv_σ$, for example an EOM with a $V_π$ of 4.7 V, a $V_{sat}$ of 6.3V, and $Gv_σ/V_π = 0.73\pm0.03$. Even greater tolerances can be achieved with a higher $V_{sat}$ (21 V), lower $V_π$ (3.5 V), and $Gv_σ/V_π \approx 3.2 \pm 2.3$. This model aids in selecting these parameters such that the carrier suppression is resilient to fluctuations in these voltages due to temperature variations and aging of the components. The model predictions are validated by testing a fiber optic gyroscope interrogated with a broadened laser for various $Gv_σ$ and $V_{sat}$ and inferring the carrier suppression from its measured noise. A -44-dB carrier suppression was observed for a nonlinear amplifier with $Gv_σ$ = 3.43 V, $V_{sat}$ = 6.3 V, and an EOM with $V_π$ = 4.7 V, in agreement with predictions.
Influence of Spectral Mismatch, Cell Reflection Properties and IQE on the Efficiency Measurement
Creators: name: Herguth, A.
name: Raabe, B.
name: Scholz, S.
name: Hahn, G.
name: Haverkamp, H.
name: Nissler, R.
name: Habermann, D.
name: Buchner, C.
name: Schmid, C.
Publisher: name: WIP
Year: 2011
Subjects: Wafer-based Silicon Solar Cells and Materials Technology
Silicon Solar Cell Characterisation and Modelling

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 1555-1557
description: The determination of the electrical parameters and in particular the efficiency of solar cells should be
done according to STC. However, hardly any solar simulator or flasher features a spectrum perfectly matched to
STC’s ASTM G173 (AM 1.5g) spectrum. If the external quantum efficiency (EQE) of the calibration cell and the cell
to be tested differ, any spectral mismatch of the applied spectrum compared to STC may not only lead to an
erroneous measurement of current and cell efficiency but also to de-optimization of cell properties or
misinterpretation of experimental results. As an example it is shown that the combination of spectral and EQE
mismatch yield a different optimum of the (effective) layer thickness of the anti-reflection coating (ARC) resulting in
a de-optimization according to STC. As a second example, the misinterpretation of benefits due to the
implementation of selective emitter technology is discussed.
Robotic additive construction of bar structures: Unified sequence and motion planning
Creators: name: Huang, Yijiang
name: Garrett, Caelan
name: Ting, Ian
name: Parascho, Stefana
name: Mueller, Caitlin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Additive robotic construction of building-scale discrete bar structures, such as trusses and space frames, is increasingly attractive due to the potential improvements in efficiency, safety, and design possibilities. However, programming complex robots, such as manipulators with seven degrees of freedom, to successfully complete construction tasks can be tedious, challenging, or impossible for a human to do manually. Namely, the structure must be constructed in a sequence that preserves structural properties, such as stiffness, at each step. At the same time, this sequence must allow for the robot to precisely manipulate elements within the in-progress structure while respecting geometric constraints that, for example, ensure the robot does not collide with what it has built. In this work, we present an automated and newly generalized planning approach for jointly finding a construction sequence and robot motion plan for additive construction that satisfies these requirements. Our approach can be applied in a variety of additive construction processes, and we demonstrate it specifically on spatial extrusion and discrete bar assembly in this paper. We demonstrate the effectiveness of our approach on several simulated and real-world extrusion and assembly tasks, including a human-scale physical prototype, for which our algorithm is deployed for the first time to plan the assembly of a complicated double tangent bar system design.
Skyrmion Logic Clocked via Voltage Controlled Magnetic Anisotropy
Creators: name: Walker, Benjamin W.
name: Cui, Can
name: Garcia-Sanchez, Felipe
name: Incorvia, Jean Anne C.
name: Hu, Xuan
name: Friedman, Joseph S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Emerging Technologies (cs.ET)
subject: Systems and Control (eess.SY)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Magnetic skyrmions are exciting candidates for energy-efficient computing due to their non-volatility, detectability,and mobility. A recent proposal within the paradigm of reversible computing enables large-scale circuits composed ofdirectly-cascaded skyrmion logic gates, but it is limited by the manufacturing difficulty and energy costs associated withthe use of notches for skyrmion synchronization. To overcome these challenges, we therefore propose a skyrmion logicsynchronized via modulation of voltage-controlled magnetic anisotropy (VCMA). In addition to demonstrating theprinciple of VCMA synchronization through micromagnetic simulations, we also quantify the impacts of current den-sity, skyrmion velocity, and anisotropy barrier height on skyrmion motion. Further micromagnetic results demonstratethe feasibility of cascaded logic circuits in which VCMA synchronizers enable clocking and pipelining, illustrating afeasible pathway toward energy-efficient large-scale computing systems based on magnetic skyrmions.
Determination of two-photon exchange via $e^+p/e^-p$ Scattering with CLAS12
Creators: name: Bernauer, Jan C.
name: Burkert, Volker D.
name: Cline, Ethan
name: Schmidt, Axel
name: Sharabian, Youri
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The proton elastic form factor ratio shows a discrepancy between measurements using the Rosenbluth technique in unpolarized beam and target experiments and measurements using polarization degrees of freedom. The proposed explanation of this discrepancy is uncorrected hard two-photon exchange (TPE), a type of radiative correction that is conventionally neglected. The effect size and agreement with theoretical predictions has been tested recently by three experiments. While the results support the existence of a small two-photon exchange effect, they cannot establish that theoretical treatments are valid. At larger momentum transfers, theory remains untested. This proposal aims to measure two-photon exchange over an extended and so far largely untested $Q^2$ and $\varepsilon$ range with high precision using the {\tt CLAS12} experiment. Such data are crucial to clearly confirm or rule out TPE as the driver for the discrepancy as well as test several theoretical approaches, believed valid in different parts of the tested $Q^2$ range.
description: 7 pages, 8 figures. Submitted to EPJA Topical Issue "An Experimental Program with Positron Beams at Jefferson Lab". arXiv admin note: substantial text overlap with arXiv:2007.15081, arXiv:1906.09419
Modified Homotopy Analysis Method for Zakharov-Kuznetsov Equations
Creators: name: Muhammad USMAN, Tamour ZUBAIR
Publisher: name: Walailak University
Year: 2013
Subjects: Homotopy analysis method, Taylors series, exact solutions, MAPLE, Zakharov-Kuznetsov equations

description: 5, 10, Walailak Journal of Science and Technology
Spatial shifts in productivity of the coastal ocean over the past two decades induced by migration of the Pacific Anticyclone and Bakun effect in the Humboldt Upwelling Ecosystem
Creators: name: Weidberg, Nicolas
name: Ospina-Alvarez, Andres
name: Bonicelli, Jessica
name: Barahona, Mario
name: Aiken, Christopher M.
name: Broitman, Bernardo R.
name: Navarrete, Sergio A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences
subject: J.2; J.3
subject: 92-10, 92B99,

description: Intensification and poleward expansion of upwelling favourable winds have been predicted as a response to anthropogenic global climate change and have recently been documented in most Eastern Boundary Upwelling Ecosystems of the world. To identify how these processes are impacting nearshore oceanographic habitats and, especially, long term trends of primary productivity in the Humboldt Upwelling Ecosystem (HUE), we analysed time series of sea level pressure, wind stress, sea surface and atmospheric surface temperatures, and Chlorophyll-a, as a proxy for primary productivity, along 26° - 36° S. We show that climate induced trends in primary productivity are highly heterogeneous across the region. On the one hand, the well documented poleward migration of the South Pacific Anticyclone (SPA) has led to decreased spring upwelling winds in the region between ca. 30° and 34° S, and to their intensification to the south. Decreased winds have produced slight increases in sea surface temperature and a pronounced and meridionally extensive decrease in surface Chlorophyll-a in this region of central Chile. To the north of 30° S, significant increases in upwelling winds, decreased SST, and enhanced Chlorophyll-a concentration are observed in the nearshore. We show that this increased in upwelling driven coastal productivity is probably produced by the increased land-sea pressure gradients (Bakun's effect) that have occurred over the past two decades north of 30° S. Thus, climate drivers along the HUE are inducing contrasting trends in oceanographic conditions and primary productivity, which can have far-reaching consequences for coastal pelagic and benthic ecosystems and lead to geographic displacements of the major fisheries.
description: 19 pages, 4 figures, 1 appendix
Momentum feedback from marginally-resolved HII regions in isolated disc galaxies
Creators: name: Jeffreson, Sarah M. R.
name: Krumholz, Mark R.
name: Fujimoto, Yusuke
name: Armillotta, Lucia
name: Keller, Benjamin W.
name: Chevance, Mélanie
name: Kruijssen, J. M. Diederik
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present a novel, physically-motivated sub-grid model for HII region feedback within the moving mesh code Arepo, accounting for both the radiation pressure-driven and thermal expansion of the ionised gas surrounding young stellar clusters. We apply this framework to isolated disc galaxy simulations with mass resolutions between $10^3~{\rm M}_\odot$ and $10^5~{\rm M}_\odot$ per gas cell. Each simulation accounts for the self-gravity of the gas, the momentum and thermal energy from supernovae, the injection of mass by stellar winds, and the non-equilibrium chemistry of hydrogen, carbon and oxygen. We reduce the resolution-dependence of our model by grouping those HII regions with overlapping ionisation front radii. The Strömgren radii of the grouped HII regions are at best marginally-resolved, so that the injection of purely-thermal energy within these radii has no effect on the interstellar medium. By contrast, the injection of momentum increases the fraction of cold and molecular gas by more than 50 per cent at mass resolutions of $10^3~{\rm M}_\odot$, and decreases its turbulent velocity dispersion by $\sim 10~{\rm kms}^{-1}$. The mass-loading of galactic outflows is decreased by an order of magnitude. The characteristic lifetime of the least-massive molecular clouds ($M/{\rm M}_\odot < 5.6 \times 10^4$) is reduced from $\sim 18$ Myr to $<10$ Myr, indicating that HII region feedback is effective in destroying these clouds. Conversely, the lifetimes of intermediate-mass clouds ($5.6 \times 10^4 < M/{\rm M}_\odot < 5 \times 10^5$) are elongated by $\sim 7$ Myr, likely due to a reduction in supernova clustering. The derived cloud lifetimes span the range from $10$-$40$ Myr, in agreement with observations. All results are independent of whether the momentum is injected from a 'spherical' or a 'blister-type HII region.
description: Accepted for publication in MNRAS. Comments welcome!
Warm millimetre dust in protoplanetary discs near massive stars
Creators: name: Haworth, T. J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Dust plays a key role in the formation of planets and its emission also provides one of our most accessible views of protoplanetary discs. If set by radiative equilibrium with the central star, the temperature of dust in the disc plateaus at around $10-20$K in the outer regions. However sufficiently nearby massive stars can heat the outer disc to substantially higher temperatures. In this paper we study the radiative equilibrium temperature of discs in the presence of massive external sources and gauge the effect that it has on millimetre dust mass estimates. Since millimetre grains are not entrained in any wind we focus on geometrically simple 2D-axisymmetric disc models using radiative transfer calculations with both the host star and an external source. Recent surveys have searched for evidence of massive stars influencing disc evolution using disc properties as a function of projected separation. In assuming a disc temperature of $20$K for a disc a distance $D$ from a strong radiation source, disc masses are overestimated by a factor that scales with $D^{-1/2}$ interior to the separation that external heating becomes important. This could significantly alter dust mass estimates of discs in close proximity to $θ^1$C in the Orion Nebular Cluster. We also make an initial assessment of the effect upon snow lines. Within a parsec of an O star like $θ^1$C a CO snow line no longer exists, though the water snow line is virtually unaffected except for very close separations of $\leq0.01\,$pc.
description: 11 pages, 10 figures. Accepted for publication in MNRAS
Magnetic dynamos in white dwarfs -- I. Explaining the dearth of bright intermediate polars in globular clusters
Creators: name: Belloni, Diogo
name: Schreiber, Matthias R.
name: Salaris, Maurizio
name: Maccarone, Thomas J.
name: Zorotovic, Monica
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Recently, Bahramian et al. investigated a large sample of globular clusters (GCs) and found that bright intermediate polars (IPs) are a factor of 10 less frequent in GCs than in the Galactic field. We theoretically investigate here this discrepancy based on GC numerical simulations. We found that, due to disruptive dynamical interaction, there is on average a reduction of only half of bright IP progenitors, which is clearly not enough to explain the observed deficiency. However, if the rotation- and crystallization-driven dynamo scenario recently proposed by Schreiber et al. is incorporated in the simulations, the observed rareness of bright IPs in GCs can be reproduced. This is because bright cataclysmic variables in GCs are typically very old systems ($\gtrsim$ 10 Gyr), with white dwarfs that almost fully crystallized before mass transfer started, which does not allow strong magnetic fields to be generated. The observed mass density of bright IPs in GCs can be recovered if around one third of the bright cataclysmic variables dynamically formed through mergers have magnetic field strengths similar to those of IPs. We conclude that the observed paucity of bright IPs in GCs is a natural consequence of the newly proposed rotation- and crystallization-driven dynamo scenario.
description: letter accepted for publication by MNRAS