cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Isotope enrichment in neon clusters grown in helium nanodroplets
Creators: name: Tiefenthaler, Lukas
name: Kollotzek, Siegfried
name: Gatchell, Michael
name: Hansen, Klavs
name: Scheier, Paul
name: Echt, Olof
Publisher: name: arXiv
Year: 2022
Subjects: subject: Atomic and Molecular Clusters (physics.atm-clus)
subject: FOS: Physical sciences

description: Neon cluster ions Ne$_s^+$ grown in pre-ionized, mass-to-charge selected helium nanodroplets (HNDs) reveal a strong enrichment of the heavy isotope $^{22}$Ne that depends on cluster size s and the experimental conditions. For small sizes the enrichment is much larger than previously reported for bare neon clusters grown in nozzle expansions and subsequently ionized. The enrichment is traced to the massive evaporation of neon atoms in a collision cell that is used to strip helium from the HNDs. We derive a relation between the enrichment of $^{22}$Ne in the cluster ion and its corresponding depletion factor $F$ in the vapor phase. The value thus found for $F$ is in excellent agreement with a theoretical expression that relates isotopic fractionation in two-phase equilibria of atomic gases to the Debye temperature. Furthermore, the difference in zero-point energies between the two isotopes computed from F agrees reasonably well with theoretical studies of neon cluster ions that include nuclear quantum effects in the harmonic approximation. Another fitting parameter provides an estimate for the size s$_i$ of the precursor of the observed Ne$_s^+$. The value is in satisfactory agreement with the size estimated by modeling the growth of Ne$_s^+$, and with lower and upper limits deduced from other experimental data. On the other hand, neon clusters grown in neutral HNDs that are subsequently ionized by electron bombardment exhibit no statistically significant isotope enrichment at all. The finding suggests that the extent of ionization-induced dissociation of clusters embedded in HNDs is considerably smaller than for bare clusters.
description: 14 pages, 5 figures, supplementary material
Peculiar Radio Structures in the Central Regions of Galaxy Cluster Abell 585
Creators: name: Jamrozy, M.
name: Stawarz, Ł
name: Marchenko, V.
name: Kuzmicz, A.
name: Ostrowski, M.
name: Cheung, C. C.
name: Sikora, M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: In this paper we analyze the peculiar radio structure observed across the central region of the galaxy cluster Abell 585 (z=0.12). In the low-resolution radio maps, this structure appears uniform and diffuse on angular scales of ~3 arcmin, and is seemingly related to the distant (z=2.5) radio quasar B3 0727+409 rather than to the cluster itself. However, after a careful investigation of the unpublished archival radio data with better angular resolution, we resolve the structure into two distinct arcmin-scale features, which resemble typical lobes of cluster radio galaxies with no obvious connection to the background quasar. We support this conclusion by examining the spectral and polarization properties of the features, demonstrating in addition that the analyzed structure can hardly be associated with any sort of a radio mini-halo or relics of the cluster. Yet at the same time we are not able to identify host galaxies of the radio lobes in the available optical and infrared surveys. We consider some speculative explanations for our findings, including gravitational wave recoil kicks of SMBHs responsible for the lobes' formation in the process of merging massive ellipticals within the central parts of a rich cluster environment, but we do not reach any robust conclusions regarding the origin of the detected radio features.
description: 11 pages, 3 figures, 2 tables, accepted for publication in MNRAS
A framework for reuse of multi-view UML artifacts
Creators: name: Salami, Hamza Onoruoiza
name: Ahmed, Moataz
Publisher: name: arXiv
Year: 2014
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Software is typically modeled from different viewpoints such as structural view, behavioral view and functional view. Few existing works can be considered as applying multi-view retrieval approaches. A number of important issues regarding mapping of entities during multi-view retrieval of UML models is identified in this study. In response, we describe a framework for reusing UML artifacts, and discuss how our retrieval approach tackles the identified issues.
description: conference proceeding
Longitudinal Structure Function $F_{L}$ from Charm Structure Function $F^{c}_{2}$
Creators: name: Rezaei, B.
name: Boroun, G. R.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We predict the effect of the charm structure function on the longitudinal structure function at small x. In NLO analysis we find that the hard Pomeron behavior gives a good description of $F_{L}$ and $F^{c}_{k}$ (k = 2,L) at small x values. We conclude that a direct relation between $F_{L}/F^{c}_{2}$ would provide useful information on how to measure longitudinal structure function at high $Q^{2}$ values. Having checked that this model gives a good description of the data, when compared with other models.
description: 5 pages, 3 figures
Thin Films on the Skin, but not Frictional Agents, Attenuate the Percept of Pleasantness to Brushed Stimuli
Creators: name: Rezaei, Merat
name: Nagi, Saad S.
name: Xu, Chang
name: McIntyre, Sarah
name: Olausson, Hakan
name: Gerling, Gregory J.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: FOS: Biological sciences

description: Brushed stimuli are perceived as pleasant when stroked lightly on the skin surface of a touch receiver at certain velocities. While the relationship between brush velocity and pleasantness has been widely replicated, we do not understand how resultant skin movements - e.g., lateral stretch, stick-slip, normal indentation - drive us to form such judgments. In a series of psychophysical experiments, this work modulates skin movements by varying stimulus stiffness and employing various treatments. The stimuli include brushes of three levels of stiffness and an ungloved human finger. The skin's friction is modulated via non-hazardous chemicals and washing protocols, and the skin's thickness and lateral movement are modulated by thin sheets of adhesive film. The stimuli are hand-brushed at controlled forces and velocities. Human participants report perceived pleasantness per trial using ratio scaling. The results indicate that a brush's stiffness influenced pleasantness more than any skin treatment. Surprisingly, varying the skin's friction did not affect pleasantness. However, the application of a thin elastic film modulated pleasantness. Such barriers, though elastic and only 40 microns thick, inhibit the skin's tangential movement and disperse normal force. The finding that thin films modulate affective interactions has implications for wearable sensors and actuation devices.
Photochemistry of atomic oxygen green and red-doublet emissions in comets at larger heliocentric distances
Creators: name: Raghuram, Susarla
name: Bhardwaj, Anil
Publisher: name: arXiv
Year: 2014
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: In comets the atomic oxygen green to red-doublet emission intensity ratio (G/R ratio) of 0.1 has been used to confirm H$_2$O as the parent species producing oxygen emission lines. The larger ($>$0.1) value of G/R ratio observed in a few comets is ascribed to the presence of higher CO$_2$ and CO relative abundances in the cometary coma. We aim to study the effect of CO$_2$ and CO relative abundances on the observed G/R ratio in comets observed at large ($>$2 au) heliocentric distances by accounting for important production and loss processes of O($^1$S) and O($^1$D) in the cometary coma. Recently we have developed a coupled chemistry-emission model to study photochemistry of O($^1$S) and O($^1$D) atoms and the production of green and red-doublet emissions in comets Hyakutake and Hale-Bopp. In the present work we applied the model to six comets where green and red-doublet emissions are observed when they are beyond 2 au from the Sun. In a water-dominated cometary coma and with significant ($>$10%) CO$_2$ relative abundance, photodissociation of H$_2$O mainly governs the red-doublet emission, whereas CO$_2$ controls the green line emission. If a comet has equal composition of CO$_2$ and H$_2$O, then ~50% of red-doublet emission intensity is controlled by the photodissociation of CO$_2$. The G/R ratio values and green and red-doublet line widths calculated by the model are consistent with the observation. Our model calculations suggest that in low gas production rate comets the G/R ratio greater than 0.1 can be used to constrain the upper limit of CO$_2$ relative abundance provided the slit-projected area on the coma is larger than the collisional zone. If a comet has equal abundances of CO$_2$ and H$_2$O, then the red-doublet emission is significantly ($\sim$50%) controlled by CO$_2$ photodissociation and thus the G/R ratio is not suitable for estimating CO$_2$ relative abundance.
description: 12 pages, 9 figures, and 3 tables
title: Oltre lo specchio: Lacan e Merleau-Ponty
Creators: name: Sili , Gioia
Publisher: name: Roma Tre-Press
Year: 2020

description: La teoria dello ‘stadio dello specchio’ è stata elaborata in diverse fasi dallo psicoanalista Jacques Lacan e poi ripresa dal filosofo Maurice Merleau-Ponty in più momenti. Il valore di questa riflessione è così profondo da rappresentare ancora oggi un campo d’indagine aperto. A tal proposito, l’articolo intende seguire in una prospettiva critica le differenti interpretazioni che nel corso del tempo si sono susseguite, prestando particolare attenzione al rapporto tra lo schermo cinematografico e il soggetto e valorizzando, al contempo, alcuni elementi di convergenza tra i due pensatori.

description: B@belonline vol. 6 New Phenomenological Horizons/Nuovi orizzonti fenomenologici
Anomalous Expansion of Coronal Mass Ejections during Solar Cycle 24 and its Space Weather Implications
Creators: name: Gopalswamy, Nat
name: Akiyama, Sachiko
name: Yashiro, Seiji
name: Xie, Hong
name: Mäkelä, Pertti
name: Michalek, Grzegorz
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The familiar correlation between the speed and angular width of coronal mass ejections (CMEs) is also found in solar cycle 24, but the regression line has a larger slope: for a given CME speed, cycle 24 CMEs are significantly wider than those in cycle 23. The slope change indicates a significant change in the physical state of the heliosphere, due to the weak solar activity. The total pressure in the heliosphere (magnetic + plasma) is reduced by ~40%, which leads to the anomalous expansion of CMEs explaining the increased slope. The excess CME expansion contributes to the diminished effectiveness of CMEs in producing magnetic storms during cycle 24, both because the magnetic content of the CMEs is diluted and also because of the weaker ambient fields. The reduced magnetic field in the heliosphere may contribute to the lack of solar energetic particles accelerated to very high energies during this cycle.
description: 13 pages, 4 figures, 1 table
Das Konzept der Basalen Stimulation bei Menschen mit einer schwersten Beeinträchtigung in Kombination mit dem Schema der emotionalen Entwicklung - Umsetzungsmöglichkeiten
Creators: name: Anderegg, Katja
name: Deneys, Gwendolyne
Publisher: name: Zenodo
Year: 2022

description: Das Schema der emotionalen Entwicklung ist ein Diagnoseinstrument für die Erfassung des emotionalen Entwicklungsstandes von Menschen mit einer kognitiven Beeinträchtigung. Dabei stehen pädagogisch-therapeutische Interventionen zur Verfügung, die zur jeweiligen Diagnose passen. Die Basale Stimulation ist ein Konzept, bei dem auf elementare Möglichkeiten zurückgegriffen wird, um mit Menschen mit schwersten Beeinträchtigungen in Kontakt zu treten und Handlungsideen zu schaffen. Unklar ist, wie sich die beiden Konzepte kombinieren lassen und welche Perspektive eine Zusammenführung der beiden Konzepte für die Bedürfnisse von Menschen mit schwersten (kognitiven) Beeinträchtigung eröffnen kann. Diesen Punkten widmen sich die Autorinnen Katja Anderegg und Gwendolyne Deneys in Form einer Literaturrecherche, um Professionelle im Behindertenbereich für das emotionale Entwicklungsalter und die basalen Bedürfnisse von Menschen mit schwersten Intelligenzminderungen zu sensibilisieren. Unter dem Titel «Das Konzept der Basalen Stimulation bei Menschen mit einer schwersten Beeinträchtigung in Kombination mit dem Schema der emotionalen Entwicklung – Umsetzungsmöglichkeiten» werden Fragestellungen zu Menschen mit schwersten Beeinträchtigungen, den beiden Konzepten sowie der Frage nach Umsetzungsmöglichkeiten, welche sich aus der Kombination der Schwerpunkte, der Interventionen und der Angebote ergeben, nachgegangen. So zeigen die Ergebnisse auf, wie dringend erwachsene Menschen mit einer schwersten Intelligenzminderung und einem tiefen emotionalen Entwicklungsstand aufgrund ihrer kindlichen Bedürfnisse auf Nähe angewiesen sind und welchen Mehrwert die Basale Stimulation dabei bieten kann.
description: + Code Diss LU: hslusa basp + Fussnote: Bachelor-Arbeit, Hochschule Luzern – Soziale Arbeit, Studienrichtung Sozialpädagogik, 2022 + NL-Code: NLLUHSA202209
Decoupling of the DGLAP evolution equations at next-to-next-to-leading order (NNLO) at low-x
Creators: name: Boroun, G. R.
name: Rezaei, B.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present a set of formulas to extract two second-order independent differential equations for the gluon and singlet distribution functions. Our results extend from the LO up to NNLO DGLAP evolution equations with respect to the hard-Pomeron behavior at low-x. In this approach, both singlet quarks and gluons have the same high-energy behavior at low-x. We solve the independent DGLAP evolution equations for the functions $F^{s}_{2}(x,Q^{2})$ and $G(x,Q^{2})$ as a function of their initial parameterization at the starting scale $Q^{2}_{0}$ . The results not only give striking support to the hard-Pomeron description of the low-x behavior, but give a rather clean test of perturbative QCD showing an increase of the gluon distribution and singlet structure functions as x decreases. We compared our numerical results with the published BDM (Block et al. Phys. Rev. D 77:094003 (2008)) gluon and singlet distributions, starting from their initial values at $Q^{2}_{0} =1 GeV^{2}$.
description: 8 pages,2 figures
Bounded perturbations of two-dimensional diffusion processes with nonlocal conditions near the boundary
Creators: name: Gurevich, Pavel
Publisher: name: arXiv
Year: 2014
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 47F05, 35J15, 47D07, 35J25

description: We study the existence of Feller semigroups arising in the theory of multidimensional diffusion processes. We study bounded perturbations of elliptic operators with boundary conditions containing an integral over the closure of the domain with respect to a nonnegative Borel measure without assuming that the measure is small. We state sufficient conditions on the measure guaranteeing that the corresponding nonlocal operator is the generator of a Feller semigroup.
description: 17 pages, 1 figure
Anomalies in the specific heat of a free damped particle: The role of the cutoff in the spectral density of the coupling
Creators: name: Spreng, Benjamin
name: Ingold, Gert-Ludwig
name: Weiss, Ulrich
Publisher: name: arXiv
Year: 2014
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The properties of a dissipative system depend on the spectral density of the coupling to the environment. Mostly, the dependence on the low-frequency behavior is in the focus of interest. However, in order to avoid divergencies, it is also necessary to suppress the spectral density of the coupling at high frequencies. Interestingly, the very existence of this cutoff may lead to a mass renormalization which can have drastic consequences for the thermodynamic properties of the dissipative system. Here, we explore the role which the cutoff in the spectral density of the coupling plays for a free damped particle and we compare the effect of an algebraic cutoff with that of a sharp cutoff.
description: 13 pages, 8 figures
title: Annotazioni sulla nozione di ἐξαίφνης nel Parmenide di Platone
Creators: name: Aiello , Miriam
Publisher: name: Roma Tre-Press
Year: 2020

description: L’articolo si interroga sui problemi sollevati dalla sezione sull'istante - τὸ ἐξαίφνης - (155e-157b) nel Parmenide di Platone. In primo luogo,  vengono analizzati il ruolo e il significato dell’avverbio ἐξαίφνης attraverso un confronto delle sue occorrenze nelle opere di Platone. Alla luce delle diverse opzioni interpretative, indicate dagli studiosi, si indagano, poi,  lo status di Parm. 155e-157b e le possibili ragioni per cui Platone fornisce questa indagine ausiliaria nel momento successivo alle conclusioni della seconda serie di deduzioni. Infine, viene discussa, più da vicino la deduzione, il ruolo e il significato teorico di τὸ ἐξαίφνης in Parm. 156d-e.

description: B@belonline vol. 6 New Phenomenological Horizons/Nuovi orizzonti fenomenologici
Flops for Complete Intersection Calabi-Yau Threefolds
Creators: name: Brodie, Callum
name: Constantin, Andrei
name: Lukas, Andre
name: Ruehle, Fabian
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Algebraic Geometry (math.AG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We study flops of Calabi-Yau threefolds realised as Kaehler-favourable complete intersections in products of projective spaces (CICYs) and identify two different types. The existence and the type of the flops can be recognised from the configuration matrix of the CICY, which also allows for constructing such examples. The first type corresponds to rows containing only 1s and 0s, while the second type corresponds to rows containing a single entry of 2, followed by 1s and 0s. We give explicit descriptions for the manifolds obtained after the flop and show that the second type of flop always leads to isomorphic manifolds, while the first type in general leads to non-isomorphic flops. The singular manifolds involved in the flops are determinantal varieties in the first case and more complicated in the second case. We also discuss manifolds admitting an infinite chain of flops and show how to identify these from the configuration matrix. Finally, we point out how to construct the divisor images and Picard group isomorphisms under both types of flops.
description: 20 pages
The predictions of the charm structure function exponents behaviour at low x in deep inelastic scattering
Creators: name: Boroun, G. R.
name: Rezaei, B.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We use the hard (Lipatov) pomeron for the low-x gluon distribution and provide a compact formula for the ratio $R^{c} =F_{L}^{c}/F_{2}^{c}$ that is useful to extract the charm structure function from the reduced charm cross-section, in particular at DESY HERA. Our results show that this ratio is independent of x and independent of the DGLAP evolution of the gluon PDF. As a result, we show that the charm structure function and the reduced charm cross-section exponents do not have the same behaviour at very low x. This difference is independent of the input gluon distribution functions and predicts the non-linear effects and some evidence for shadowing and antishadowing at HERA and RHIC.
description: 6 pages,4 figures
Spin disorder in an Ising honeycomb chain cobaltate
Creators: name: Igarashi, Hirokazu
name: Shimizu, Yasuhiro
name: Kobayashi, Yoshiaki
name: Itoh, Masayuki
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report on a member of the spin-disordered honeycomb lattice antiferromagnet in a quasi-one-dimensional cobaltate Ba_3Co_2O_6(CO_3)_0.7. Resistivity exhibits as semimetallic along the face-sharing CoO6 chains. Magnetic susceptibility shows strongly anisotropic Ising-spin character with the easy axis along the chain due to significant spin-orbit coupling and a trigonal crystal field. Nevertheless, ^135Ba NMR detects no indication of the long-range magnetic order down to 0.48 K. Marginally itinerant electrons possess large entropy and low-lying excitations with a Wilson ratio R_W = 116, which highlight interplays of charge, spin, and orbital in the disordered ground state.
description: 5 pages, 5 figures
Pengolahan teks dasar dengan R menggunakan stringr
Creators: name: Rajeg, Gede Primahadi Wijaya
Publisher: name: figshare
Year: 2022
Subjects: subject: 80308 Programming Languages
subject: FOS: Computer and information sciences
subject: Language
subject: 200399 Language Studies not elsewhere classified
subject: FOS: Languages and literature
subject: 200402 Computational Linguistics

description: Tutorial daring penggunaan modul stringr untuk pengolahan teks dengan bahasa pemrograman R. Tutorial ini disajikan pada R-Ladies Jakarta 15th meet-up (2 April 2022, 1400-1600 WIB) (rekaman).
Three body resonances in close orbiting planetary systems: Tidal dissipation and orbital evolution
Creators: name: Papaloizou, John C. B.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We study the orbital evolution of a three planet system with masses in the super-Earth regime resulting from the action of tides on the planets induced by the central star which cause orbital circularization. We consider systems either in or near to a three body commensurability for which adjacent pairs of planets are in a first order commensurability. We develop a simple analytic solution, derived from a time averaged set of equations, that describes the expansion of the system away from strict commensurability as a function of time, once a state where relevant resonant angles undergo small amplitude librations has been attained. We perform numerical simulations that show the attainment of such resonant states focusing on the Kepler 60 system. The results of the simulations confirm many of the scalings predicted by the appropriate analytic solution. We go on to indicate how the results can be applied to put constraints on the amount of tidal dissipation that has occurred in the system. For example, if the system has been in a librating state since its formation, we find that its present period ratios imply an upper limit on the time average of 1/Q', with Q' being the tidal dissipation parameter. On the other hand if a librating state has not been attained, a lower upper bound applies.
description: Accepted for publication in the International Journal of Astrobiology
title: Forecasting Banks’ Corporate Loan Losses Under Stress: A New Corporate Default Model
Creators: name: Bruneau, Gabriel
name: Duprey, Thibaut
name: Hipp,  Ruben
Publisher: name: Bank of Canada
Year: 2022

description: We develop a corporate default model to forecast corporate loan losses of the Canadian
banking sector under stress. First, we tackle a data gap by reconstructing historical default
probabilities for banks’ loan portfolios. Second, we estimate tail elasticities to capture nonlinear
relationships between macrofinancial conditions and default probabilities. By explicitly
modelling default probabilities associated with macroeconomic tail events, this model
significantly improves the Bank of Canada’s stress-testing infrastructure.
Mapping alteration of dopaminergic neurons in a rat model of Parkinson Disease through the comparison of the presynaptic PET tracers
Creators: name: Roost, Pauline
name: Gubinelli, Francesco
name: Gaudin, Mylène
name: Guillermier, Martine
name: Cresto, Noémie
name: Eymin, Leopold
name: Josephine, Charlène
name: Gaillard, Marie-Claude
name: Bemelmans, Alexis
name: Bramoullé, Yann
name: Brouillet, Emmanuel
name: Hantraye, Philippe
name: Van Camp, Nadja
Publisher: name: Zenodo
Year: 2018
Subjects: Parkinson
PET imaging
DAT
AADC

description: ABSTRACT - NECTAR 2018

Parkinson’s Disease (PD) is characterized by dopaminergic neuronal loss in the substantia nigra (SN) resulting in a dopamine deficiency in the striatum.1 We developed a pathologically relevant rat model of PD using viral vectors to overexpress mutant alpha-synuclein.2 Our aims were to evaluate the dopaminergic changes and neuronal loss at different time-points in this model with two different presynaptic PET tracers, and relate imaging results with behavioural and histological changes. Therefor rats were unilaterally injected in the SN with AAV2/6 viral vector coding for mutated (A53T) human alpha-synuclein, and were studied at 6 or 12 weeks post-injection (wpi). PET imaging was performed using 6-[18F]fluoro-L-m-tyrosine3 (FMT), a substrate for AADC and [18F]-LBT9994 (LBT), a radioligand for dopamine transporter (DAT). Quantitative uptake images were calculated using Logan and Patlak graphical methods, with a cerebellar reference. At 6wpi we did not observe any asymmetry in the striatum; neither with FMT (n=5;p=0.421) nor LBT (n=6;p=0.310). At 12wpi we observed an asymmetry with LBT (n=4;p=0.003), but not with FMT (n=2;p=0.336). Histological evaluation showed 28% loss of TH-positive cells in the SN at 12wpi (n=8;p=0.031), but not at 6wpi (n=6;ns). A motor deficit was observed with the cylinder test at both time-points (n=7/8;p<0.001). Our results indicate that, in contrast to FMT, LBT parametric PET imaging is sufficiently sensitive to detect dopaminergic alterations in vivo in a rat model characterized by progressive and mild neurodegeneration of the nigro-striatal pathway. This PET tracer may be of particular interest to test neuroprotective or neuro-restorative therapeutic strategies in future studies using our PD rat model.

References:

1.            [10.1016/S0896-6273(03)00568-3]

2.            Cresto et al. [2017], Neurodegener Dis 2017;17(suppl 1):8-590 – Page 448.

3.            [10.1111/jnc.14016]

4.            [10.1016/j.nucmedbio.2013.09.007]

Acknowledgements:

This project has been funded by the European Union Horizon 2020 Programme (H2020-MSCA-ITN-2015) under the Marie Skłodowska-Curie Innovative Training Network and Grant Agreement No.676408.
description: This project has been funded by the European Union Horizon 2020 Programme (H2020-MSCA-ITN-2015) under the Marie Skłodowska-Curie Innovative Training Network and Grant Agreement No.676408.
NLO corrections to the hard pomeron behavior of the charm structure functions $F^{c}_{k} (k = 2,L)$ at low x
Creators: name: Boroun, G. R.
name: Rezaei, B.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We show that the charm structure functions $F^{c}_{k}$ have a hard pomeron behavior at low x, as the gluon distribution is dominated by the hard (Lipatov) pomeron at small x and all $Q^{2}$ values. It is shown that the charm structure functions obtained, using the gluon distribution functions, are in agreement with data from HERA in the next-to-leading analysis (NLO). Having checked that this behavior gives the charm structure functions exponent independent of x. With respect to the hard (Lipatov) pomeron for the low-x gluon distribution, we provide a compact formula for the ratio $R^{c} = F^{c}_{L}/F^{c}_{2}$ that is approximately independent of x at low x and its independent of the input gluon distribution function at all $Q^{2}$ values.
description: 10 pages, 7 figures
The Ratio of the Charm Structure Functions $F^{c}_{k}(k = 2, L)$ at Low x in Deep Inelastic Scattering with Respect to the Expansion Method
Creators: name: Boroun, G. R.
name: Rezaei, B.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the expansion method for the gluon distribution function at low x values and calculate the charm structure functions in the LO and NLO analysis. Our results provide a compact formula for the ratio $R^{c} =F^{c}_{L}/F^{c}_{2}$, which is approximately independent of x and the details of the parton distribution function at low x values. This ratio could be a good probe of the charm structure function $F^{c}_{2}$ in the proton deduced from the reduced charm cross sections at DESY HERA. These results show that the charm structure functions obtained are in agreement with HERA experimental data and other theoretical models.
description: 9 pages,6 figures
Modeling Immunity to Malaria with an Age-Structured PDE Framework
Creators: name: Qu, Zhuolin
name: Patterson, Denis
name: Childs, Lauren
name: Edholm, Christina
name: Ponce, Joan
name: Prosper, Olivia
name: Zhao, Lihong
Publisher: name: arXiv
Year: 2021
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: FOS: Biological sciences
subject: 92D30, 35Q92, 92B05

description: Malaria is one of the deadliest infectious diseases globally, causing hundreds of thousands of deaths each year. It disproportionately affects young children, with two-thirds of fatalities occurring in under-fives. Individuals acquire protection from disease through repeated exposure, and this immunity plays a crucial role in the dynamics of malaria spread. We develop a novel age-structured PDE malaria model, which couples vector-host epidemiological dynamics with immunity dynamics. Our model tracks the acquisition and loss of anti-disease immunity during transmission and its corresponding nonlinear feedback onto the transmission parameters. We derive the basic reproduction number ($\mathcal{R}_0$) as the threshold condition for the stability of disease-free equilibrium; we also interpret $\mathcal{R}_0$ probabilistically as a weighted sum of cases generated by infected individuals at different infectious stages and different ages. We parametrize our model using demographic and immunological data from sub-Saharan regions. Numerical bifurcation analysis demonstrates the existence of an endemic equilibrium, and we observe a forward bifurcation in $\mathcal{R}_0$. Our numerical simulations reproduce the heterogeneity in the age distributions of immunity profiles and infection status created by frequent exposure. Motivated by the recently approved RTS,S vaccine, we also study the impact of vaccination; our results show a reduction in severe disease among young children but a small increase in severe malaria among older children due to lower acquired immunity from delayed exposure.
description: To appear in SIAM Journal on Applied Mathematics
Horizon Thermodynamics and Gravitational Field Equations in Quasi-Topological Gravity
Creators: name: Sheykhi, A.
name: Dehghani, M. H.
name: Dehghani, R.
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this paper we show that the gravitational field equations of $(n+1)$% -dimensional topological black holes with constant horizon curvature, in cubic and quartic quasi-topological gravity, can be recast in the form of the first law of thermodynamics, $dE=TdS-PdV$, at the black hole horizon. This procedure leads to extract an expression for the horizon entropy as well as the energy (mass) in terms of the horizon radius, which coincide exactly with those obtained in quasi-topological gravity by solving the field equations and using the Wald's method. We also argue that this approach is powerful and can be extended to all higher order quasi-topological gravity for extracting the corresponding entropy and energy in terms of horizon radius.
description: 9 pages
Long-time dynamics in quantum spin lattices: ergodicity and hydrodynamic projections at all frequencies and wavelengths
Creators: name: Ampelogiannis, Dimitrios
name: Doyon, Benjamin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Obtaining rigorous and general results about the non-equilibrium dynamics of extended many-body systems is a difficult task. In quantum lattice models with short-range interactions, the Lieb-Robinson bound tells us that the spatial extent of operators grows at most linearly in time. But what happens within this light-cone? We discuss rigorous results on ergodicity and the emergence of the hydrodynamic scale, which establish fundamental principles at the root of non-equilibrium physics. One key idea of the present work is that general structures of hydrodynamics at the Euler scale follow independently from the details of the microscopic dynamics, and in particular do not necessitate chaos; they are consequences of "extensivity". Another crucial observation is that these apply at arbitrary frequencies and wavelengths. That is, long-time oscillatory behaviours can be reproduced from a natural extension of standard hydrodynamic notions, thus enlarging the hydrodynamic paradigm beyond the zero-frequency / infinite-wavelength point that it traditionally addresses.
description: v1: 6 pages, 10 pages supplemental material v2: 54 pages, largely extended, including the full proof of hydrodynamic projections in arbitrary dimensions, submitted to Ann. H. Poincar\'e, special issue dedicated to the memory of Krzysztof Gawedski
Thermal conductivity of group-IV Semiconductors from a Kinetic-Collective Model
Creators: name: de Tomas, C.
name: Cantarero, A.
name: Lopeandia, A. F.
name: Alvarez, F. X.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The thermal conductivity of several diamond-like materials is calculated from a kinetic-collective model. From this approach, a thermal conductivity expression is obtained that includes a transition from a kinetic (free) to a collective (hydrodynamic) behavior of the phonon field. The expression contains only three parameters. Once fitted to natural occurring silicon, the same parameters for the other materials are directly calculated from theoretical relations. The results are in good agreement with experimental data.
Steering Recommendations and Visualising Its Impact: Effects on Adolescents' Trust in E-Learning Platforms
Creators: name: Ooge, Jeroen
name: Dereu, Leen
name: Verbert, Katrien
Publisher: name: arXiv
Year: 2023
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: Researchers have widely acknowledged the potential of control mechanisms with which end-users of recommender systems can better tailor recommendations. However, few e-learning environments so far incorporate such mechanisms, for example for steering recommended exercises. In addition, studies with adolescents in this context are rare. To address these limitations, we designed a control mechanism and a visualisation of the control's impact through an iterative design process with adolescents and teachers. Then, we investigated how these functionalities affect adolescents' trust in an e-learning platform that recommends maths exercises. A randomised controlled experiment with 76 middle school and high school adolescents showed that visualising the impact of exercised control significantly increases trust. Furthermore, having control over their mastery level seemed to inspire adolescents to reasonably challenge themselves and reflect upon the underlying recommendation algorithm. Finally, a significant increase in perceived transparency suggested that visualising steering actions can indirectly explain why recommendations are suitable, which opens interesting research tracks for the broader field of explainable AI.
description: 15 pages, 11 figures, published in ACM IUI '23: 28th International Conference on Intelligent User Interfaces Proceedings
Dual-probe spectroscopic fingerprints of defects in graphene
Creators: name: Settnes, Mikkel
name: Power, Stephen R.
name: Petersen, Dirch H.
name: Jauho, Antti-Pekka
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Recent advances in experimental techniques emphasize the usefulness of multiple scanning probe techniques when analyzing nanoscale samples. Here, we analyze theoretically dual-probe setups with probe separations in the nanometer range, i.e., in a regime where quantum coherence effects can be observed at low temperatures. In a dual-probe setup the electrons are injected at one probe and collected at the other. The measured conductance reflects the local transport properties on the nanoscale, thereby yielding information complementary to that obtained with a standard one-probe setup (the local density-of-states). In this work we develop a real space Green's function method to compute the conductance. This requires an extension of the standard calculation schemes, which typically address a finite sample between the probes. In contrast, the developed method makes no assumption on the sample size (e.g., an extended graphene sheet). Applying this method, we study the transport anisotropies in pristine graphene sheets, and analyze the spectroscopic fingerprints arising from quantum interference around single-site defects, such as vacancies and adatoms. Furthermore, we demonstrate that the dual-probe setup is a useful tool for characterizing the electronic transport properties of extended defects or designed nanostructures. In particular, we show that nanoscale perforations, or antidots, in a graphene sheet display Fano-type resonances with a strong dependence on the edge geometry of the perforation.
$a$-Points of the Riemann zeta-function on the critical line
Creators: name: Lester, S. J.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11M06, 11M26, 60F05

description: We investigate the proportion of the nontrivial roots of the equation $ζ(s)=a$, which lie on the line $\Re s=1/2$ for $a \in \mathbb C$ not equal to zero. We show that at most one-half of these points lie on the line $\Re s=1/2$. Moreover, assuming a spacing condition on the ordinates of zeros of the Riemann zeta-function, we prove that zero percent of the nontrivial solutions to $ζ(s)=a$ lie on the line $\Re s=1/2$ for any nonzero complex number $a$.
description: 20 pages, To appear in Int. Math. Res. Notices
A variant of Siegel's theorem for Drinfeld modules
Creators: name: Coccia, Simone
name: Ghioca, Dragos
Publisher: name: arXiv
Year: 2023
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: We complete the proof of a Siegel type statement for finitely generated $Φ$-submodules of $\mathbb{G}_a$ under the action of a Drinfeld module $Φ$.
description: 14 pages. arXiv admin note: text overlap with arXiv:0704.1331
Next-to-soft-virtual resummed rapidity distribution for Drell-Yan process to $\rm{\textbf{NNLO}+\overline{\textbf{NNLL}}}$
Creators: name: Ajjath, A. H.
name: Mukherjee, Pooja
name: Ravindran, V.
name: Sankar, Aparna
name: Tiwari, Surabhi
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present the differential predictions for the rapidity distribution of a pair of leptons through the Drell-Yan (DY) process at the LHC taking into account the soft-virtual (SV) as well as next-to-soft virtual (NSV) resummation effects in QCD perturbation theory to next-to-next-to-leading-order plus next-to-next-to-leading-logarithmic ($\rm{NNLO+\overline{NNLL}}$) accuracy. We perform the resummation in two dimensional Mellin space using our recent formalism \cite{Ajjath:2020lwb} by limiting ourselves to contributions only from quark anti-quark ($q \bar q$) initiated channels. The resummed corrections to the fixed order results are computed through a matched formula using the minimal prescription procedure. We find that the resummation at next-to-leading-logarithmic (next-to-next-to-leading-logarithmic) level brings about 3.98\% (1.24\%) corrections respectively to the NLO (NNLO) results at the central scale value of $q=M_Z$ for 13 TeV LHC. We also observe that the sensitivity to the renormalisation scale gets improved substantially by the inclusion of NSV resummed predictions at $\rm \overline{NNLL}$ accuracy. Further, the lack of quark gluon ($qg$) initiated contributions to NSV part in the $\rm \overline{NNLL}$ resummed predictions leaves large factorisation scale dependence indicating their importance at NSV level as we go to higher orders in perturbation theory.
description: 21 pages, 9 figures, 7 tables. We have corrected some typos in equations 10,11, B3 and B6 and also added Eq 12 in this version
Langevin dynamics, large deviations and instantons for the quasi-geostrophic model and two-dimensional Euler equations
Creators: name: Bouchet, Freddy
name: Laurie, Jason
name: Zaboronski, Oleg
Publisher: name: arXiv
Year: 2014
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We investigate a class of simple models for Langevin dynamics of turbulent flows, including the one-layer quasi-geostrophic equation and the two-dimensional Euler equations. Starting from a path integral representation of the transition probability, we compute the most probable fluctuation paths from one attractor to any state within its basin of attraction. We prove that such fluctuation paths are the time reversed trajectories of the relaxation paths for a corresponding dual dynamics, which are also within the framework of quasi-geostrophic Langevin dynamics. Cases with or without detailed balance are studied. We discuss a specific example for which the stationary measure displays either a second order (continuous) or a first order (discontinuous) phase transition and a tricritical point. In situations where a first order phase transition is observed, the dynamics are bistable. Then, the transition paths between two coexisting attractors are instantons (fluctuation paths from an attractor to a saddle), which are related to the relaxation paths of the corresponding dual dynamics. For this example, we show how one can analytically determine the instantons and compute the transition probabilities for rare transitions between two attractors.
description: 22 pages, 5 figures, submitted to j. stat. phys
pde-10_pdb_bind_format_blinded.zip
Creators: name: Tosstorff, Andreas
name: Rudolph, Markus G.
name: Cole, Jason C.
name: Reutlinger, Michael
name: Kramer, Christian
name: Schaffhauser, Hervé
name: Nilly, Agnès
name: Flohr, Alexander
name: Kuhn, Bernd
Publisher: name: figshare
Year: 2022
Subjects: subject: 30499 Medicinal and Biomolecular Chemistry not elsewhere classified
subject: FOS: Chemical sciences

description: Docking poses of PDE10A inhibitors
Parameter estimation by fixed point of function of information processing intensity
Creators: name: Jankowski, Rober
name: Makowski, Marcin
name: Piotrowski, Edward W.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: We present a new method of estimating the dispersion of a distribution which is based on the surprising property of a function that measures information processing intensity. It turns out that this function has a maximum at its fixed point. We use a fixed-point equation to estimate the parameter of the distribution that is of interest to us. We illustrate the estimation method by using the example of an exponential distribution. The codes of programs that calculate the experimental values of the information processing intensity are presented.
description: 5 pages, 2 figures
Entanglement Routers via Wireless Quantum Network Based on Arbitrary Two Qubit Systems
Creators: name: Metwally, N.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A wireless quantum network is generated between multi-hop, where each hop consists of two entangled nodes. These nodes share a finite number of entangled two qubit systems randomly. Different types of wireless quantum bridges are generated between the non-connected nodes. The efficiency of these wireless quantum bridges to be used as quantum channels between its terminals to perform quantum teleportation is investigated. We suggest a theoretical wireless quantum communication protocol to teleport unknown quantum signals from one node to another, where the more powerful wireless quantum bridges are used as quantum channels. It is shown that, by increasing the efficiency of the sources which emit the initial partial entangled states, one can increase the efficiency of the wireless quantum communication protocol.
Towards Effective risk Communication: Validating Social Cognitive Theory Through Farmer's Response Behavior to Flood Warnings
Creators: name: Arreza, Christine Marie B.
Publisher: name: Zenodo
Year: 2021
Subjects: Flooding
Agriculture
Flood Warning System

description: Flooding is considered one of the most devastating natural disasters in the Philippines and greatly contributes to economic loss. It is even more critical as the country's economy is largely dependent on agriculture and its natural resources. Hence, the most affected among the sectors are the farmers who strongly depend on natural resources as their sole source of income. However, existing literatures on risk communication have given little focus on farmers' coping mechanism to flood events and understanding their behavior towards flood advisories. From this perspective, this study discusses the factors that influence how farmers behave toward the Flood Early Warning System's (FEWS) warnings with validation from the premises and core concepts of the Social Cognitive Theory. Survey results from eighty-eight (88) farmer respondents revealed that 'non-tangible results such as individual, social, and environmental factors should be considered in creating and disseminating flood advisories. The Chi-Square of Independence also showed that farmers have a high risk perception of flooding with significant regard to their flooding experiences linked with cognitive biases. Furthermore, results revealed that farmers are more exposed to traditional media channels and take into account their social influences specifically with family/community members in seeking warning information. Finally, this study highlights discussion on administrative, technical, and policy development changes with integration on social cognitive processes to motivate and promote response behavior among farmers and forming part in disaster preparedness.