cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Eruption and propagation of twisted flux ropes from the base of the solar corona to 1 au
Creators: name: Regnault, F.
name: Strugarek, A.
name: Janvier, M.
name: Auchère, F.
name: Lugaz, N.
name: Al-Haddad, N.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Interplanetary Coronal Mass Ejections (ICMEs) originate from the eruption of complex magnetic structures occurring in our star's atmosphere. Determining the general properties of ICMEs and the physical processes at the heart of their interactions with the solar wind is a hard task, in particular using only unidimensional in situ profiles. Thus, these phenomena are still not well understood. In this study we simulate the propagation of a set of flux ropes in order to understand some of the physical processes occurring during the propagation of an ICME such as their growth or their rotation. We present simulations of the propagation of a set of flux ropes in a simplified solar wind. We consider different magnetic field strengths and sizes at the initiation of the eruption, and characterize their influence on the properties of the flux ropes during their propagation. We use the 3D MHD module of the PLUTO code on an Adaptive Mesh Refinement grid. The evolution of the magnetic field of the flux rope during the propagation matches evolution law deduced from in situ observations. We also simulate in situ profiles that spacecraft would have measured at the Earth, and we compare with the results of statistical studies. We find a good match between simulated in situ profiles and typical profiles obtained in these studies. During their propagation, flux ropes interact with the magnetic field of the wind but still show realistic signatures of ICMEs when analyzed with synthetic satellite crossings. We also show that flux ropes with different shapes and orientations can lead to similar unidimensional crossings. This warrants some care when extracting magnetic topology of ICMEs using unidimensional crossings.
description: Accepted for publication A&A. 14 pages, 9 figures, 3 tables
Pulse design without rotating wave approximation
Creators: name: Ibáñez, S.
name: Li, Yi-Chao
name: Chen, Xi
name: Muga, J. G.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We design realizable time-dependent semiclassical pulses to invert the population of a two-level system faster than adiabatically when the rotating-wave approximation cannot be applied. Different approaches, based on the counterdiabatic method or on invariants, may lead to singularities in the pulse functions. Ways to avoid or cancel the singularities are put forward when the pulse spans few oscillations. For many oscillations an alternative numerical minimization method is proposed and demonstrated.
description: 7 pages, 5 figures
Spatial field reconstruction with INLA: Application to simulated galaxies
Creators: name: Smole, Majda
name: Rino-Silvestre, João
name: González-Gaitán, Santiago
name: Stalevski, Marko
Publisher: name: arXiv
Year: 2022
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Aims. Monte Carlo Radiative Transfer (MCRT) simulations are a powerful tool for understanding the role of dust in astrophysical systems and its influence on observations. However, due to the strong coupling of the radiation field and medium across the whole computational domain, the problem is non-local and non-linear and such simulations are computationally expensive in case of realistic 3D inhomogeneous dust distributions. We explore a novel technique for post-processing MCRT output to reduce the total computational run time by enhancing the output of computationally less expensive simulations of lower-quality. Methods. We combine principal component analysis (PCA) and non-negative matrix factorization (NMF) as dimensionality reduction techniques together with Gaussian Markov random fields and the Integrated nested Laplace approximation (INLA), an approximate method for Bayesian inference, to detect and reconstruct the non-random spatial structure in the images of lower signal-to-noise or with missing data. Results. We test our methodology using synthetic observations of a galaxy from the SKIRT Auriga project - a suite of high resolution magneto-hydrodynamic Milky Way-sized galaxies simulated in cosmological environment by 'zoom-in' technique. With this approach, we are able to reproduce high photon number reference images $\sim5$ times faster with median residuals below $\sim20\%$.
description: To be published in Numerical methods and codes of Astronomy and Astrophysics
Εκτίμηση της πιθανότητας χρεοκοπίας με βάση δεδομένα της αγοράς και χρηματοοικονομική επιτήρηση
Creators: name: Χατζηαναγνώστου, Ευστράτιος
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2023
Subjects: subject: Πιθανότητα αθέτησης
subject: Κατανομές επιτοκίων
subject: Προσομοίωση
subject: Χρηματοοικονομική επιτήρηση

description: Τα τελευταία χρόνια έχουν αναπτυχθεί διάφορα εργαλεία, μοντέλα και διαδικασίες που αφορούν την αξιολόγηση και μέτρηση του πιστωτικού κινδύνου, αφού το ενδιαφέρον των χρηματοπιστωτικών ιδρυμάτων για την ορθολογική διαχείρισή του έχει μετατραπεί σε αδήριτη ανάγκη. Έχει γίνει πια σαφές ότι ο πιστωτικός κίνδυνος αποτελεί τη σοβαρότερη απειλή για τη φερεγγυότητα των πιστωτικών οργανισμών και πολλές φορές για τη βιωσιμότητά τους. Η Τράπεζα της Ελλάδος, γνωρίζοντας τις προκλήσεις που δημιουργούν οι εξελίξεις αυτές, έχει εντείνει την προληπτική εποπτεία των τραπεζών, σύμφωνα με το αναθεωρημένο κανονιστικό πλαίσιο της Βασιλείας («Βασιλεία ΙΙI»). Στην παρούσα εργασία θα περιγράψουμε μια μέθοδος εκτίμησης της έκθεσης στον πιστωτικό κίνδυνο όπως προκύπτει από την ανάλυση διαθέσιμων στοιχείων της αγοράς που αφορούν στα ασφάλιστρα κινδύνου και την καμπύλη αποδόσεων για τα εταιρικά ομόλογα ή δάνεια. Πιο συγκεκριμένα θα γίνει παρουσίαση των μέτρων εποπτείας και της σημασίας τους για την ορθή λειτουργία της οικονομικής αγοράς. Στη συνέχεια θα παρουσιάσουμε τα μοντέλα πρόβλεψης της πιθανότητας αθέτησης για απλό δανεισμό μιας και δυο περιόδων χωρίς και με ανάκτηση και θα γενικεύσουμε το μοντέλο για πολλές περιόδους. Τέλος, στην περίπτωση που έχουμε στοχαστικά επιτόκια θα εξετάσουμε πώς μπορούμε να μελετήσουμε τα παραπάνω μοντέλα με τη χρήση προσομοίωσης.
Small-scale dynamo in cool main sequence stars. II. The effect of metallicity
Creators: name: Witzke, V.
name: Duehnen, H. B.
name: Shapiro, A. I.
name: Przybylski, D.
name: Bhatia, T. S.
name: Cameron, R.
name: Solanki, S. K.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: All cool main sequence stars including our Sun are thought to have magnetic fields. Observations of the Sun revealed that even in quiet regions small-scale turbulent magnetic fields are present. Simulations further showed that such magnetic fields affect the subsurface and photospheric structure, and thus the radiative transfer and emergent flux. Since small-scale turbulent magnetic fields on other stars cannot be directly observed, it is imperative to study their effects on the near surface layers numerically. Until recently comprehensive three-dimensional simulations capturing the effect of small-scale turbulent magnetic fields only exists for the solar case. A series of investigations extending SSD simulations for other stars has been started. Here we aim to examine small-scale turbulent magnetic fields in stars of solar effective temperature but different metallicity. We investigate the properties of three-dimensional simulations of the magneto-convection in boxes covering the upper convection zone and photosphere carried out with the MURaM code for metallicity values of $ \rm M/H = \{-1.0, 0.0, 0.5\}$ with and without a small-scale-dynamo. We find that small-scale turbulent magnetic fields enhanced by a small-scale turbulent dynamo noticeably affect the subsurface dynamics and significantly change the flow velocities in the photosphere. Moreover, significantly stronger magnetic field strengths are present in the convection zone for low metallicity. Whereas, at the optical surface the averaged vertical magnetic field ranges from 64G for M/H = 0.5 to 85G for M/H = -1.0.
description: 13 pages, 18 figures, submitted to A&A
On the Ergodic Capacity of MIMO Free-Space Optical Systems over Turbulence Channels
Creators: name: Zhang, Jiayi
name: Dai, Linglong
name: Han, Yanjun
name: Zhang, Yu
name: Wang, Zhaocheng
Publisher: name: arXiv
Year: 2015
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: The free-space optical (FSO) communications can achieve high capacity with huge unlicensed optical spectrum and low operational costs. The corresponding performance analysis of FSO systems over turbulence channels is very limited, especially when using multiple apertures at both transmitter and receiver sides. This paper aim to provide the ergodic capacity characterization of multiple-input multiple-output (MIMO) FSO systems over atmospheric turbulence-induced fading channels. The fluctuations of the irradiance of optical channels distorted by atmospheric conditions is usually described by a gamma-gamma ($ΓΓ$) distribution, and the distribution of the sum of $ΓΓ$ random variables (RVs) is required to model the MIMO optical links. We use an $α$-$μ$ distribution to efficiently approximate the probability density function (PDF) of the sum of independent and identical distributed $ΓΓ$ RVs through moment-based estimators. Furthermore, the PDF of the sum of independent, but not necessarily identically distributed $ΓΓ$ RVs can be efficiently approximated by a finite weighted sum of PDFs of $ΓΓ$ distributions. Based on these reliable approximations, novel and precise analytical expressions for the ergodic capacity of MIMO FSO systems are derived. Additionally, we deduce the asymptotic simple expressions in high signal-to-noise ratio regimes, which provide useful insights into the impact of the system parameters on the ergodic capacity. Finally, our proposed results are validated via Monte-Carlo simulations.
description: 10 pages, 6 figures, This paper has been accepted by IEEE Journal on Selected Areas in Communications - Special Issue on Optical Wireless Communication
Südschleswigdänisch – Probleme einer varietätentypologischen Einordnung
Creators: name: Goll, Sabrina
Publisher: name: Christian-Albrechts-Universität zu Kiel
Year: 2019
Subjects: subject: Südschleswigdänisch, Varietätentypologie, Klassifizierung
subject: 948 Scandinavia
subject: 439 Language, Minor Germanic

description: Kieler Arbeiten zur skandinavistischen Linguistik; 4
Proposal of a preliminay Planetary Protection protocol for the development of future Mars missions at the University of Vigo.
Creators: name: Ramírez Ramos, Alejandro
name: Ulla Miguel, Ana
name: Cardesín Moinelo, Alejandro
name: Chiussi, Stefano
name: Berrocal Bravo, Alicia
name: Moral Inza, Andoni
name: Briones Llorente, Carlos
Publisher: name: Zenodo
Year: 2022
Subjects: Astrobiology
Cleanrooms
COSPAR

description: Planetary protection (PP) is the scientific discipline that aims to keep the celestial bodies under study and the Earth free of biological and molecular contamination from samples that could have been brought back by space missions. We present here a research collaboration between the University of Vigo, ESA and INTA/CAB to analyse, adapt and test standard Planetary Protection (PP) protocols to avoid biological contamination during the development of future Mars exploration instrumentation. This student research project is based on the standard PP requirements, procedures and techniques currently used for Mars science instruments, in particular for the Raman Laser Spectrometer (RLS) developed at INTA/CAB for the ESA ExoMars mission. The goal of the project is to compile, adapt and test these procedures in the current instrumentation facilities at the University of Vigo, so they could be used for the development of science payload in a potential future mission to Mars surface.
description: This study has been supported by the ESA Science Faculty at ESAC, INTA/CAB RLS team, UVigo SpaceLab, CINTECX FA3 group and the Faculty of Biology of the University of Vigo.
Effects of trinexapae-ethyl on stoloon development in potted Patriot bermudagrass
Creators: name: Lenzi, A.
name: Baldi, A.
name: Nannicini, M.
name: Pardini, A.
name: Tesi, R.
Publisher: name: Advances in Horticultural Science
Year: 2013

description: A recent technique developed for establishment of warm season turfgrasses is based on the transplant of single plug plantlets pre-rooted in the nursery. Plantlets are obtained from one-node sprigs about 2 cm long derived from stolon fragmentation. Usually, stolons must be cut several times to obtain sprigs of the right length because of overly long internodes. In the present study, potted plants of Patriot bermudagrass grown in the nursery were treated with trinexa-pac-ethyl (TE) at the rates 0.1, 0.2, 0.4 and 0.8 kg a.i. ha-1. TE application was aimed at obtaining internode shortening in order to facilitate the stolon division practice. In fact, TE-treated plants showed a decrease in the average length of internodes with respect to control at any applied rate. Nevertheless, the lowest rate applied (0.1 kg a.i. ha-1) did not assure a prolonged effect while the highest rate (0.8 kg a.i. ha-1) caused a decrease in the yield of sprigs. Therefore, our results suggest that TE may be advantageously used and at rates of 0.2-0.4 kg a.i. ha-1 to control stolon development of Patriot bermudagrass for nursery purposes.
description: Advances in Horticultural Science, Vol 26 No 1 (2012)
Vortex structure deformation of rotating Lifshitz Holographic Superconductors
Creators: name: Herrera-Mendoza, Jhony A.
name: Higuita-Borja, Daniel F.
name: Méndez-Zavaleta, Julio A.
name: Herrera-Aguilar, Alfredo
name: Pérez-Rodríguez, Felipe
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We construct a type-II holographic superconductor from an anisotropic rotating background metric. We study the effects of the magnetic field on the vortex structure, including continuous deformations both from triangular to square lattices or vice versa. Our holographic model reproduces known experimental vortex lattice deformations and the increment of the vortex population by increasing the external magnetic field.
description: 5 pages, 3 figures. Published version
Deep Robot Sketching: An application of Deep Q-Learning Networks for human-like sketching
Creators: name: Fernandez-Fernandez, Raul
name: Victores, Juan G.
name: Balaguer, Carlos
Publisher: name: arXiv
Year: 2024
Subjects: subject: Robotics (cs.RO)
subject: Artificial Intelligence (cs.AI)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: Neural and Evolutionary Computing (cs.NE)
subject: FOS: Computer and information sciences

description: The current success of Reinforcement Learning algorithms for its performance in complex environments has inspired many recent theoretical approaches to cognitive science. Artistic environments are studied within the cognitive science community as rich, natural, multi-sensory, multi-cultural environments. In this work, we propose the introduction of Reinforcement Learning for improving the control of artistic robot applications. Deep Q-learning Neural Networks (DQN) is one of the most successful algorithms for the implementation of Reinforcement Learning in robotics. DQN methods generate complex control policies for the execution of complex robot applications in a wide set of environments. Current art painting robot applications use simple control laws that limits the adaptability of the frameworks to a set of simple environments. In this work, the introduction of DQN within an art painting robot application is proposed. The goal is to study how the introduction of a complex control policy impacts the performance of a basic art painting robot application. The main expected contribution of this work is to serve as a first baseline for future works introducing DQN methods for complex art painting robot frameworks. Experiments consist of real world executions of human drawn sketches using the DQN generated policy and TEO, the humanoid robot. Results are compared in terms of similarity and obtained reward with respect to the reference inputs
Analysis of the planetary mass uncertainties on the accuracy of atmospherical retrieval
Creators: name: Di Maio, C.
name: Changeat, Q.
name: Benatti, S.
name: Micela, G.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Characterising the properties of exoplanet atmospheres relies on several interconnected parameters, which makes it difficult to determine them independently. Planetary mass plays a role in determining the scale height of atmospheres, similarly to the contribution from the average molecular weight of the gas. We investigate the relevance of planetary mass knowledge in spectral retrievals, identifying cases where mass measurements are needed for clear or cloudy and primary or secondary atmospheres, along with the relevant precision, in the context of the ESA M4 Ariel Mission. We used TauREx to simulate the Ariel transmission spectra of representative targets of the Ariel mission reference sample, assuming different scenarios: a primordial cloudy atmosphere of a hot Jupiter and a hot Neptune, as well as the secondary atmosphere of a super-Earth that also exhibits a cloud presence. We extracted information on the various properties of the atmospheres for the cases of unknown mass or mass with different uncertainties. We also tested how the signal-to-noise ratio impacts atmospheric retrieval for different wavelength ranges. We accurately retrieved the primordial atmospheric composition independently from mass uncertainties for clear atmospheres, while we found that the uncertainties increased for high altitude clouds. We highlight the importance of the signal-to-noise ratio in the Rayleigh scattering region of the spectrum. For the secondary atmosphere cases, a mass uncertainty no larger than 50% is sufficient to retrieve the atmospheric parameters, even in the presence of clouds. Our analysis suggests that even in the worst-case scenario, a 50% mass precision level is enough for producing reliable retrievals, while an atmospheric retrieval without any knowledge of a planetary mass could lead to biases in cloudy primary atmospheres as well as in secondary atmospheres.
description: 29 pages, 21 figures. Accepted for publication in Section 10. Planets and planetary systems of Astronomy and Astrophysics. The official date of acceptance is 15/11/2022. Abstract shortened for the arXiv listing
Relieving tensions related to the lensing of CMB temperature power spectra
Creators: name: Couchot, F.
name: Henrot-Versillé, S.
name: Perdereau, O.
name: Plaszczynski, S.
name: d'Orfeuil, B. Rouillé
name: Spinelli, M.
name: Tristram, M.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The angular power spectra of the cosmic microwave background (CMB) temperature anisotropies reconstructed from Planck data seem to present too much gravitational lensing distortion. This is quantified by the control parameter $A_L$ that should be compatible with unity for a standard cosmology. With the Class Boltzmann solver and the profile-likelihood method, for this parameter we measure a 2.6$σ$ shift from 1 using the Planck public likelihoods. We show that, owing to strong correlations with the reionization optical depth $τ$ and the primordial perturbation amplitude $A_s$, a $\sim2σ$ tension on $τ$ also appears between the results obtained with the low ($\ell\leq 30$) and high ($30
description: accepted by A&A
Hybrid Approach to Identify Druglikeness Leading Compounds against COVID-19 3CL Protease
Creators: name: Aqeel, Imra
name: Majid, Abdul
Publisher: name: arXiv
Year: 2022
Subjects: subject: Biomolecules (q-bio.BM)
subject: Machine Learning (cs.LG)
subject: FOS: Biological sciences
subject: FOS: Computer and information sciences

description: SARS-COV-2 is a positive single-strand RNA-based macromolecule that has caused the death of more than 6.3 million people since June 2022. Moreover, by disturbing global supply chains through lockdown, the virus has indirectly caused devastating damage to the global economy. It is vital to design and develop drugs for this virus and its various variants. In this paper, we developed an in-silico study-based hybrid framework to repurpose existing therapeutic agents in finding drug-like bioactive molecules that would cure Covid-19. We employed the Lipinski rules on the retrieved molecules from the ChEMBL database and found 133 drug-likeness bioactive molecules against SARS coronavirus 3CL Protease. Based on standard IC50, the dataset was divided into three classes active, inactive, and intermediate. Our comparative analysis demonstrated that the proposed Extra Tree Regressor (ETR) based QSAR model has improved prediction results related to the bioactivity of chemical compounds as compared to Gradient Boosting, XGBoost, Support Vector, Decision Tree, and Random Forest based regressor models. ADMET analysis is carried out to identify thirteen bioactive molecules with ChEMBL IDs 187460, 190743, 222234, 222628, 222735, 222769, 222840, 222893, 225515, 358279, 363535, 365134 and 426898. These molecules are highly suitable drug candidates for SARS-COV-2 3CL Protease. In the next step, the efficacy of bioactive molecules is computed in terms of binding affinity using molecular docking and then shortlisted six bioactive molecules with ChEMBL IDs 187460, 222769, 225515, 358279, 363535, and 365134. These molecules can be suitable drug candidates for SARS-COV-2. It is anticipated that the pharmacologist/drug manufacturer would further investigate these six molecules to find suitable drug candidates for SARS-COV-2. They can adopt these promising compounds for their downstream drug development stages.
description: 28 pages
Propagative material of grapevine: RFID technology for supporting traceability of "basic" and "certified" material along the wine production chain
Creators: name: Luvisi, A.
name: Panattoni, A.
name: Bandinelli, R.
name: Rinaldelli, E.
name: Pagano, M.
name: Triolo, E.
Publisher: name: Advances in Horticultural Science
Year: 2013

description: Four main categories of propagative material in the European Union (EU) have been indentified for grapevine: the primary source, pre-basic, basic and certified material. Each type of material has to be periodically assayed for pathogens and each material stage is intrinsically characterized by increasing risks. Radiofrequency (RFID) can be considered an efficient and durable traceability system to provide retrieval of propagated material or check producer identity. RFID tagging of grapevines of different categories along the production line could establish a durable link between stakeholder and products. To evaluate this approach, histological observations and growth parameters of basic or certified RFID- tagged grapevine were performed, as well as requirement analysis for management of sanitary checks and for traceability of the wine production chain. Basic material can be safety tagged with RFID tags to establish mother plant vineyards; derived certified material can also safely be tagged. No detrimental performance in terms of vegetative growth and bud production were reported for mother plant vineyards from the first year of production life. Requirement analysis made it possible to individuate traceability objectives, materials and stakeholders involved, as well as the RFID-tagging steps and methods to collect sanitary and production data that are useful for traceability purposes.
description: Advances in Horticultural Science, Vol 26 No 1 (2012)
Surface plasmon-polaritons in periodic arrays of V-grooves strongly coupled to quantum emitters
Creators: name: Blake, Adam
name: Sukharev, Maxim
Publisher: name: arXiv
Year: 2015
Subjects: subject: Optics (physics.optics)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We investigate the optical response of a system consisting of periodic silver V-grooves interacting with quantum emitters. Two surface plasmon-polariton resonances are identified in the reflection spectrum of bare silver grooves, with the intensity of one resonance being localized near the bottom of the groove and that of the other resonance being distributed throughout the entire groove. The linear response of the hybrid silver-emitter system is thoroughly analyzed by considering the coupling between surface plasmon polaritons and emitters as the geometry of the grooves and the spatial distribution of emitters within the grooves are varied. The nonlinear response of the system is also considered by pumping the emitters with a short, high-intensity pulse. By changing the duration or the intensity of the pump, the population of emitters in the ground state at the end of the pump is varied, and it is found (upon probing with a short pulse) that an increase in the fraction of emitters in the ground state corresponds to an increase in Rabi splitting. Spatial variations in the ground state population throughout the emitter region are shown to be a result of field retardation.
description: 17 pages, 6 figures, submitted to Phys. Rev. B
The ultraviolet CII lines as a diagnostic of kappa-distributed electrons in planetary nebulae
Creators: name: Yao, Zheng-Wei
name: Zhang, Yong
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Non-Maxwellian $κ$ electron energy distributions (EEDs) have been proposed in recent years to resolve the so-called ``electron temperature and abundance discrepancy problem'' in the study of planetary nebulae (PNe). Thus the need to develop diagnostic tools to determine from observations the EED of PNe is raised. Arising from high energy levels, the ultraviolet (UV) emission lines from PNe present intensities that depend sensitively on the high-energy tail of the EED. In this work, we investigate the feasibility of using the \ion{C}{2}]$λ$2326/\ion{C}{2}$λ$1335 intensity ratios as a diagnostic of the deviation of the EED from the Maxwellian distribution (as represented by the $κ$ index). We use a Maxwellian decomposition approach to derive the theoretical $κ$-EED-based collisionally excited coefficients of \ion{C}{2}, and then compute the \ion{C}{2} UV intensity ratio as a function of the $κ$ index. We analyze the archival spectra acquired by the {\it International Ultraviolet Explorer} and measure the intensities of \ion{C}{2} UV lines from 12 PNe. By comparing the observed line ratios and the theoretical predictions, we can infer their $κ$ values. With the Maxwellian-EED hypothesis, the observed \ion{C}{2}]$λ$2326/\ion{C}{2}$λ$1335 ratios are found to be generally lower than those predicted from the observed optical spectra. This discrepancy can be explained in terms of the $κ$ EED. Our results show that the $κ$ values inferred range from 15 to infinity, suggesting a mild or modest deviation from the Maxwellian distribution. However, the $κ$-distributed electrons are unlikely to exist throughout the whole nebulae. A toy model shows that if just about 1--5 percent of the free electrons in a PN had a $κ$-EED as small as $κ=3$, it would be sufficient to account for the observations.
description: 26 pages, 6 figure, Published in ApJ, Updated with an erratum
The GALANTE Photometric Project: First results and the MUDEHaR extension
Creators: name: Holgado, Gonzalo
name: Maíz Apellániz, Jesús
name: Alfaro, Emilio
Publisher: name: Zenodo
Year: 2022
Subjects: Galaxy: stellar content
stars: early type
techniques: photometry
surveys

description: GALANTE is an optical (3000-9000 Å) photometric survey with seven intermediate/narrow filters that has been covering the northern Galactic Plane and some adjacent regions since 2016 using the Javalambre T80 telescope (P.I.s Emilio J. Alfaro & Jesús Maíz Apellániz). Originally designed to identify the majority of the early-type massive stars within several kpc of the Sun --including extinction characteristics-- its data will be also used for a variety of other stellar studies and the generation of a high-resolution map of the Halpha emission. As of early 2022, the observations are almost complete resulting in over 300 astronomical fields, and the first Data Release including 20 fields of 2 deg2 is now available. The results show a photometric dynamic range comparable to that of Gaia, reaching a 1\% accuracy and precision for stars brighter than AB magnitude 17, and the detection of many fainter stars In this contribution I present results of our test fields and a brief summary of the MUDEHaR project, a multi-epoch photometric survey complementary to GALANTE, proposed as the next long-term survey at the Javalambre facilities.
Disbudding effects on growth analysis of Celosia (Celosia cristata)
Creators: name: Adjei-Frimpong, P.
name: Ofosu-Anim, J.
name: Norman, J.C.
Publisher: name: Advances in Horticultural Science
Year: 2013

description: Experiments to investigate the effects of disbudding on growth analysis of two celosia cultivars, ‘Carmine’ and ‘Chief Gold’, were carried out on the field in 2009 and 2010 at the Sinna Garden of Department of Crop Science, University of Ghana, Legon, Accra, Ghana. The treatments consisted of disbudding once, disbudding twice, and no disbudding, as control, and were arranged in a 3x2 split plot in a randomized complete block design with four replications in 2009 (experiment 1) and three in 2010 (experiment 2). The two cultivars were harvested weekly during the growing period and separated into the various plant parts and oven-dried for dry weights, using appropriate formulae to calculate the various growth parameters. Analysis of variance (ANOVA) was used to analyse the data and a correlation coefficient matrix showed relationships among growth parameters. Disbudding resulted in increased leaf area index, leaf area ratio, leaf area duration, relative growth rate, and harvest index, but reduced crop growth rate and net assimilation rate. ‘Chief Gold’ had a higher harvest index than ‘Carmine’. Disbudding plants once gave the best flower head size and weight result. ‘Carmine’ gave the best flower yield and quality results in experiment 1 and ‘Chief Gold’ in experiment 2.
description: Advances in Horticultural Science, Vol 25 No 4 (2011)
A scalar hint from the diboson excess?
Creators: name: Cacciapaglia, Giacomo
name: Deandrea, Aldo
name: Hashimoto, Michio
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: In view of the recent diboson resonant excesses reported by both ATLAS and CMS Collaborations, we suggest that a new weak singlet pseudo-scalar particle, $η_W$, may decay into two weak bosons while being produced in gluon fusion at the LHC. The couplings to the gauge bosons can arise from a Wess-Zumino-Witten anomaly term and thus we study an effective model based on the anomaly term as a well motivated phenomenological model. In models where the pseudo-scalar arises as a composite state, the coefficients of the anomalous couplings can be related to the fermion components of the underlying dynamics. We provide an example to test the feasibility of the idea.
description: 6 pages, 2 figures, 2 tables, two column. Typos in (5)-(9) are corrected and several discussions are clarified. References added. Matches published version in PRL
Effects of mulching with compost on growth and physiology of Acer campestre L. and Carpinus betulus L.
Creators: name: Fini, A.
name: Ferrini, F.
Publisher: name: Advances in Horticultural Science
Year: 2013

description: The aim of this work was to evaluate the effects of mulching with compost on growth and leaf gas exchange of two widely-used ornamental trees in comparison to local nursery management standards. In addition, effects on soil respiration, soil temperature and water evaporation from soil were determined. An equal number (180 each) of uniform hedge maple (Acer campestre L.) and 180 hornbeam (Carpinus betulus L.) were planted in an experimental plot located in Pistoia. Treatments compared were: 1) chemical weeding by herbicides; 2) natural grass cover, mowed twice per year; 3) harrowing once a year; and 4) mulching with mixed compost (50% green+50% from household waste, 5 to 10 cm thick). Over a two-year period, stem diameter, shoot extension and leaf gas exchange were measured. In the second year leaf chlorophyll content, chlorophyll fluorescence, soil respiration, soil evaporation content and soil temperature were also recorded. Mulching with compost influenced shoot extension and stem diameter growth of field maple and white hornbeam. Plants grown with natural grass cover had, generally, smaller stem diameters and shoot growth than the other treatments. Leaf gas exchange, chlorophyll content and chlorophyll fluorescence were influenced by the different treatments. Soil respiration was unaffected by the different treatments while soil temperature was significantly lower in mulched plots.
description: Advances in Horticultural Science, Vol 25 No 4 (2011)
Ultracool dwarfs in Gaia DR3
Creators: name: Sarro, L. M.
name: Berihuete, A.
name: Smart, R. L.
name: Reylé, C.
name: Barrado, D.
name: García-Torres, M.
name: Cooper, W. J.
name: Jones, H. R. A.
name: Marocco, F.
name: Creevey, O. L.
name: Sordo, R.
name: Bailer-Jones, C. A. L.
name: Montegriffo, P.
name: Carballo, R.
name: Andrae, R.
name: Fouesneau, M.
name: Lanzafame, A. C.
name: Pailler, F.
name: Thévenin, F.
name: Lobel, A.
name: Delchambre, L.
name: Korn, A. J.
name: Recio-Blanco, A.
name: Schultheis, M. S.
name: De Angeli, F.
name: Brouillet, N.
name: Casamiquela, L.
name: Contursi, G.
name: de Laverny, P.
name: García-Lario, P.
name: Kordopatis, G.
name: Lebreton, Y.
name: Livanou, E.
name: Lorca, A.
name: Palicio, P. A.
name: Slezak-Oreshina, I.
name: Soubiran, C.
name: Ulla, A.
name: Zhao, H.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Aims. In this work we use the Gaia DR3 set of ultracool dwarf candidates and complement the Gaia spectrophotometry with additional photometry in order to characterise its global properties. This includes the inference of the distances, their locus in the Gaia colour-absolute magnitude diagram and the (biased through selection) luminosity function in the faint end of the Main Sequence. We study the overall changes in the Gaia RP spectra as a function of spectral type. We study the UCDs in binary systems, attempt to identify low-mass members of nearby young associations, star forming regions and clusters, and analyse their variability properties. Results. We detect 57 young, kinematically homogeneous groups some of which are identified as well known star forming regions, associations and clusters of different ages. We find that the primary members of 880 binary systems with a UCD belong mainly to the thin and thick disk components of the Milky Way. We identify 1109 variable UCDs using the variability tables in the Gaia archive, 728 of which belong to the star forming regions defined by HMAC. We define two groups of variable UCDs with extreme bright or faint outliers. Conclusions. The set of sources identified as UCDs in the Gaia archive contains a wealth of information that will require focused follow-up studies and observations. It will help to advance our understanding of the nature of the faint end of the Main Sequence and the stellar/substellar transition.
description: Accepted by Astronomy and Astrophysics. 29 pages, 20 figures plus 3 appendices
Starch accumulation in the leaves of root-restricted pepper affects plant growth by a feedback-inhibition of the photosynthesis
Creators: name: Al-Debei, H.S.
name: Mugnai, S.
Publisher: name: Advances in Horticultural Science
Year: 2013

description: The mechanism behind the reduced growth occurring in plants subjected to root restriction is still not fully understood. Therefore, this investigation was planned to determine the morphological and physiological changes induced in response to root volume reduction and to determine the time frame within which these changes occurred. In particular, this research focused on the effect of root restriction on growth, leaf gas exchange parameters, carbohydrate production and water relations in pepper (Capsicum annuum L.). Our results show that the reduced growth is mainly linked to a feedback inhibition of the photosynthesis, caused by a concurrent limited stomatal conductance (probably driven by both stomatal factors and hormonal substances) together with a strong accumulation of starch in the leaves.
description: Advances in Horticultural Science, Vol 25 No 4 (2011)
Neural Policy Style Transfer
Creators: name: Fernandez-Fernandez, Raul
name: Victores, Juan G.
name: Gago, Jennifer J.
name: Estevez, David
name: Balaguer, Carlos
Publisher: name: arXiv
Year: 2024
Subjects: subject: Robotics (cs.RO)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: Neural and Evolutionary Computing (cs.NE)
subject: FOS: Computer and information sciences

description: Style Transfer has been proposed in a number of fields: fine arts, natural language processing, and fixed trajectories. We scale this concept up to control policies within a Deep Reinforcement Learning infrastructure. Each network is trained to maximize the expected reward, which typically encodes the goal of an action, and can be described as the content. The expressive power of deep neural networks enables encoding a secondary task, which can be described as the style. The Neural Policy Style Transfer (NPST) algorithm is proposed to transfer the style of one policy to another, while maintaining the content of the latter. Different policies are defined via Deep Q-Network architectures. These models are trained using demonstrations through Inverse Reinforcement Learning. Two different sets of user demonstrations are performed, one for content and other for style. Different styles are encoded as defined by user demonstrations. The generated policy is the result of feeding a content policy and a style policy to the NPST algorithm. Experiments are performed in a catch-ball game inspired by the Deep Reinforcement Learning classical Atari games; and a real-world painting scenario with a full-sized humanoid robot, based on previous works of the authors. The implementation of three different Q-Network architectures (Shallow, Deep and Deep Recurrent Q-Network) to encode the policies within the NPST framework is proposed and the results obtained in the experiments with each of these architectures compared.
Transfer-matrix summation of path integrals for transport through nanostructures
Creators: name: Mundinar, Simon
name: Hahn, Alexander
name: König, Jürgen
name: Hucht, Alfred
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Computational Physics (physics.comp-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: On the basis of the method of iterative summation of path integrals (ISPI), we develop a numerically exact transfer-matrix method to describe the nonequilibrium properties of interacting quantum-dot systems. For this, we map the ISPI scheme to a transfer-matrix approach, which is more accessible to physical interpretation, allows for a more transparent formulation of the theory, and substantially improves the efficiency. In particular, the stationary limit is directly implemented, without the need of extrapolation. The resulting new method, referred to as "transfer-matrix summation of path integrals" (TraSPI), is then applied to resonant electronic transport through a single-level quantum dot.
description: 14 pages, 10 figures, accepted by Phys. Rev. B
Spherically symmetric brane in a bulk of f(R) and Gauss-Bonnet Gravity
Creators: name: Chakraborty, Sumanta
name: SenGupta, Soumitra
Publisher: name: arXiv
Year: 2015
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Effective gravitational field equations on a four dimensional brane embedded in a five dimensional bulk have been considered. Using the Einstein-Hilbert action along with the Gauss-Bonnet correction term, we have derived static spherically symmetric vacuum solution to the effective field equations, first order in the Gauss-Bonnet coupling parameter. The solution so obtained, has one part corresponding to general relativity with an additional correction term, proportional to the Gauss-Bonnet coupling parameter. The correction term modifies the spacetime structure, in particular, the location of the event horizon. Proceeding further, we have derived effective field equations for $f(R)$ gravity with Gauss-Bonnet correction term and a static spherically symmetric solution has been obtained. In this case the Gauss-Bonnet term modifies both the event and cosmological horizon of the spacetime. There exist another way of obtaining the brane metric --- expanding the bulk gravitational field equations in the ratio of bulk to brane curvature scale and assuming a separable bulk metric ansatz. It turns out that static, spherically symmetric solutions obtained from this perturbative method can be matched exactly, with the solutions derived earlier. This will hold for Einstein-Hilbert plus Gauss-Bonnet as well as for f(R) with the Gauss-Bonnet correction. Implications of these results are discussed.
description: revised, 35 Pages, 3 figures
Towards the global fit of the TMD gluon density in the proton from the LHC data
Creators: name: Lipatov, A. V.
name: Lykasov, G. I.
name: Malyshev, M. A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We propose a new analytical expression for the Transverse Momentum Dependent (TMD, or unintegrated) gluon density in the proton. Essential phenomenological parameters are extracted from the LHC data on inclusive hadron production in $pp$ collisions at low transverse momenta, $p_T \sim 1$~GeV. The latter are described in the framework of modified soft quark-gluon string model, where gluonic state and non-zero transverse momentum of partons inside the proton are taken into account. To determine the parameters important at moderate and large $x$ we used measurements of inclusive $b$-jet and Higgs boson production at the LHC as well as latest HERA data on proton structure functions $F_2^c(x, Q^2)$ and $F_2^b(x, Q^2)$ and reduced cross sections $σ_{\rm red}^{c}(x,Q^2)$ and $σ_{\rm red}^{b}(x,Q^2)$. The Catani-Ciafaloni-Fiorani-Marchesini evolution equation is applied to extend the initial gluon distribution into the whole kinematical region. We have achieved simultaneous description of all considered processes with $χ^2/d.o.f. = 2.2$, thus moving forward to the global fit of TMD gluon density from collider data. The obtained TMD gluon distribution in a proton is available for public usage and implemented into the TMDlib package and Monte-Carlo event generator PEGASUS.
description: 26 pages, 11 figures
Basic considerations about pruning of deciduous fruit trees
Creators: name: Giulivo, C.
Publisher: name: Advances in Horticultural Science
Year: 2013

description: Crop yield and fruit quality performance determine the economic value of the orchard system. Once the basic traits of the orchard design are defined, pruning may represent a powerful tool to modulate the vegetative and productive behaviour of the trees. The various pruning manipulations involve variations in growth, size and geometry of the plant and their effects are explained in terms of correlate functions among the tree organs. In spite of its potential, pruning can not overcome the effects of some basic mistakes made in design and management of the orchard. Basic concepts about pruning developed in the past are reassessed in light of recent knowledge on architecture and growth of the tree.
description: Advances in Horticultural Science, Vol 25 No 3 (2011)
Energy Localization Efficiency in TATB Pore Collapse Mechanisms
Creators: name: Hamilton, Brenden W.
name: Germann, Timothy C.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Atomistic and continuum scale modeling efforts have shown that shock induced collapse of porosity can occur via a wide range of mechanisms dependent on pore morphology, shockwave pressure, and material properties. The mechanisms that occur under weaker shocks tend to be more efficient at localizing thermal energy, but do not result in high, absolute temperatures or spatially large localizations compared to mechanisms found under strong shock conditions. However, the energetic material TATB undergoes a wide range of collapse mechanisms that are not typical of similar materials, leaving the collapse mechanisms and the resultant energy localization from collapse, i.e., hotspots, relatively uncharacterized. Therefore, we present pore collapse simulations of cylindrical pores in TATB for a wide range of pore sizes and shock strengths that trigger viscoplastic collapses that occur almost entirely perpendicular to the shock direction for weak shocks and hydrodynamic-like collapses for strong shocks that do not break the strong hydrogen bonds of the TATB basal planes. The resulting hotspot temperature fields from these mechanisms follow trends that differ considerably from other energetic materials; hence we compare them under normalized temperature values to assess the relative efficiency of each mechanism to localize energy. The local intra-molecular strain energy of the hotspots is also assessed to better understand the physical mechanisms behind the phenomena that leads to a latent potential energy.