cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
title: Αιτούντες άσυλο: Η δημόσια πολιτική της αποσυμφόρησης των νησιών του Αιγαίου λόγω του προσφυγικού υπερπληθυσμού την περίοδο 2019-2022
title: Asylum seekers: The public policy of decongesting the Aegean islands due to the refugee overpopulation during the period 2019-2022
titleType: AlternativeTitle
Creators: name: Σεντούκα, Ροδάνθη
Publisher: name: Πανεπιστήμιο Πελοποννήσου
Year: 2022
Subjects: subject: Πρόσφυγες--Ελλάδα
subject: Μετανάστευση--Ελλάδα
subject: Άσυλο, Δικαίωμα του
subject: Αιτούντες άσυλο
subject: πρόσφυγες
subject: αποσυμφόρηση των νησιών
subject: πολιτική ασύλου
subject: κύκλος της δημόσιας πολιτικής
subject: έλεγχος των συνόρων
subject: ευρωπαϊκή πολιτική ασύλου
subject: μετεγκαταστάσεις προσφύγων
subject: προσφυγικές ροές
subject: νομοθεσία αιτούντων άσυλο
subject: Μητρώο ΜΚΟ
subject: κλειστές δομές φιλοξενίας
subject: Υπουργείο Μετανάστευσης και Ασύλου

description: Η έκρηξη προσφυγικών ροών προς την Ελλάδα, που έλαβε χώρα το 2015, συνέχισε τα επόμενα χρόνια δημιουργώντας συνθήκες ασφυξίας στα νησιά του Ανατολικού και Κεντρικού Αιγαίου. Μετά τις εκλογές του Ιουλίου του 2019 επικρατούσε μία αναίσχυντη κατάσταση για την Ελλάδα με τις εικόνες δύσμοιρων αιτούντων άσυλο που ξεχείλιζαν τους άθλιους καταυλισμούς στα νησιά του Αιγαίου διαβιώντας σε ακατάλληλες απάνθρωπες συνθήκες. Αυτή η συνθήκη προκαλούσε τις διαμαρτυρίες των ακτιβιστών για τα ανθρώπινα δικαιώματα, αλλά και έντονες ξενοφοβικές αντιδράσεις των ντόπιων κατοίκων. Η νεοεκλεγείσα ελληνική κυβέρνηση διαμόρφωσε μία στρατηγική για την αντιμετώπιση του προβλήματος. Η παρούσα εργασία αναλύει, υπό το πρίσμα της προσέγγισης των σταδίων κατά τον Anderson, τη δημόσια πολιτική της αποσυμφόρησης των νησιών λόγω του προσφυγικού υπερπληθυσμού, που ακολούθησε η ελληνική κυβέρνηση κατά την περίοδο 2019-2022. Στην εργασία αναλύονται οι προκλήσεις που είχε να αντιμετωπίσει η ελληνική κυβέρνηση και η κατάσταση που είχε δημιουργήσει η προσφυγική κρίση στα νησιά από το 2015 μέχρι το καλοκαίρι του 2019. Γίνεται επίσης αναφορά στην άνοδο του προβλήματος στην κυβερνητική ατζέντα το 2019 και στη διαμόρφωση της αντίστοιχης δημόσιας πολιτικής. Επιπλέον, εξετάζονται αναλυτικά τα ανακοινωθέντα μέτρα και η εφαρμογή της δημόσιας πολιτικής της κυβέρνησης την περίοδο 2019-2022 προκειμένου να λυθεί το πρόβλημα και γίνεται εκτενής αναφορά στις δυσκολίες και αστοχίες που προέκυψαν στην πορεία αυτή. Κατόπιν επιχειρείται η αξιολόγηση της δημόσιας πολιτικής της αποσυμφόρησης των νησιών με ποιοτικά και ποσοτικά κριτήρια. Ακολούθως, εξετάζονται και εξωτερικοί παράγοντες που έπαιξαν σημαντικό ρόλο στην εφαρμογή της δημόσιας αυτής πολιτικής, όπως η στάση της ΕΕ, η πανδημία του κορωνοϊού και η μείωση των προσφυγικών ροών το 2021. Τέλος, εκτιμάται κατά πόσον η δημόσια αυτή πολιτική ήταν επιτυχής και υπό ποιές προϋποθέσεις θα μπορούσε να αποτελέσει πρότυπο πολιτικής για το μέλλον.
Operational experience with crab cavities at KEKB
Creators: name: Funakoshi, Y.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: KEKB was in operation from December 1988 to June 2010. The crab cavities were installed at KEKB in February 2007 and worked very stably until the end of KEKB operation. Operational experience of the crab cavities with beams is described.
description: 10 pages, contribution to the ICFA Mini-Workshop on Beam-Beam Effects in Hadron Colliders, CERN, Geneva, Switzerland, 18-22 Mar 2013
Chains Are More Flexible Under Tension
Creators: name: Carrillo, Jan-Michael Y.
name: Dobrynin, Andrey V.
name: Rubinstein, Michael
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2010

description: The mechanical response of networks, gels, and brush layers is a manifestation of the elastic properties of the individual macromolecules. Furthermore, the elastic response of macromolecules to an applied force is the foundation of the single-molecule force spectroscopy techniques. The two main classes of models describing chain elasticity include the worm-like and freely-jointed chain models. The selection between these two classes of models is based on the assumptions about chain flexibility. In many experimental situations the choice is not clear and a model describing the crossover between these two limiting classes is therefore in high demand. We are proposing a unified chain deformation model which describes the force-deformation curve in terms of the chain bending constant K and bond length b. This model demonstrates that the worm-like and freely-jointed chain models correspond to two different regimes of polymer deformation and the crossover between these two regimes depends on the chain bending rigidity and the magnitude of the applied force. Polymer chains with bending constant K>1 behave as a worm-like chain under tension in the interval of the applied forces f ≤ KkBT/b and as a freely-jointed chain for f ≥ KkBT/b (kB is the Boltzmann constant and T is the absolute temperature). The proposed crossover expression for chain deformation is in excellent agreement with the results of the molecular dynamics simulations of chain deformation and single-molecule deformation experiments of biological and synthetic macromolecules.
title: Ο ρόλος της υποσαχάριας Αφρικής στο διεθνές στερέωμα υπό την επιρροή της Ρωσίας. Αμοιβαίο όφελος ή υποβόσκοντες κίνδυνοι;
title: The role of sub-Saharan Africa in the international arena under the influence of Russia. Mutual benefits or underlying risks?
titleType: AlternativeTitle
Creators: name: Σκριμπώνης, Κωνσταντίνος
Publisher: name: Πανεπιστήμιο Πελοποννήσου
Year: 2022
Subjects: subject: Γεωπολιτική
subject: Αφρική, Υποσαχάρια--Σχέσεις--Ρωσία
subject: Αφρική, Υποσαχάρια--Εξωτερικές σχέσεις
subject: Ρωσία
subject: υποσαχάρια
subject: Αφρική
subject: Wagner
subject: πολυπολικό
subject: σύστημα

description: Στις ημέρες μας, οι ραγδαίες γεωπολιτικές εξελίξεις έχουν στρέψει την προσοχή όλων στην ανατολική Ευρώπη και συγκεκριμένα στη σύγκρουση μεταξύ Ρωσίας και Ουκρανίας. Σε μια άλλη περιοχή του κόσμου, την αφρικανική ήπειρο, την τελευταία δεκαετία διεξάγεται ένας «αγώνας για την Αφρική» μεταξύ των μεγάλων δυνάμεων. Είναι ένα νέο είδος αγώνα, πιο ευνοϊκό για την Αφρική, το οποίο αν αντιμετωπιστεί σωστά, οι Αφρικανοί μπορούν να επωφεληθούν. Εκτός των κύριων δυνάμεων όπως οι ΗΠΑ, η Κίνα και ευρωπαϊκές χώρες, μετά από δεκαετίες απουσίας, η Ρωσία εμφανίζεται ξανά στην αφρικανική ήπειρο. Η επιστροφή του Κρεμλίνου στην Αφρική, χαρακτηρίζεται από το γεγονός ότι οι ρωσο-αφρικανικές σχέσεις δεν κουβαλάνε κανένα βάρος αποικιακού παρελθόντος και ότι οι ρωσικές επενδύσεις καλύπτουν τομείς όπως οι εξοπλισμοί και η πυρηνική ενέργεια, οι οποίοι είναι υψηλά στην ατζέντα των χωρών της υποσαχάριας Αφρικής, δίνοντάς της έτσι συγκριτικό πλεονέκτημα έναντι άλλων παγκόσμιων παικτών. Το γεγονός όμως ότι η Ρωσία προμηθεύει όπλα σε πολλά αφρικανικά κράτη, αποτελεί σαφή ανησυχία δεδομένου του αριθμού των συγκρούσεων που εκτυλίσσονται στην αφρικανική ήπειρο. Η παρούσα εργασία πραγματεύεται ακριβώς αυτή την αυξανόμενη ρωσική παρουσία στην υποσαχάρια Αφρική, και τον αντίκτυπο που έχει στη στάση των αφρικανικών κρατών στο διεθνές στερέωμα, όπως η στάση τους στον ΟΗΕ. Εν συνεχεία, με χρήση εργαλείων διαχείρισης διακινδύνευσης (SWOT, Risk Matrix, Event Tree Analysis) αναλύονται οι κίνδυνοι που υποβόσκουν από την εμπλοκή της Ρωσίας στην περιοχή. Εν τέλει, είναι σειρά των αφρικανικών κρατών να επιδείξουν την απαιτούμενη ωριμότητα ούτως ώστε να εκμεταλλευτούν αυτό το ανανεωμένο ενδιαφέρον και να προσεγγίσουν κρίσιμες επενδύσεις για την ανάπτυξη των αφρικανικών λαών. Όροι κλειδιά: Υποσαχάρια Αφρική, Ρωσία, πολυπολικό σύστημα, ΟΗΕ, Wagner
Bond Tension in Tethered Macromolecules
Creators: name: Rubinstein, Michael
name: Panyukov, Sergey
name: Sheiko, Sergei S.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2011

description: The paper presents scaling analysis of mechanical tension generated in densely branched macromolecules tethered to a solid substrate with a short linker. Steric repulsion between branches results in z-fold amplification of tension in the linker, where z is the number of chain-like arms. At large z ~ 100–1000, the generated tension may exceed the strength of covalent bonds and sever the linker. Two types of molecular architectures were considered: polymer stars and polymer “bottlebrushes” tethered to a solid substrate. Depending on the grafting density, one distinguishes the so-called mushroom, loose grafting, and dense grafting regimes. In isolated (mushroom) and loosely tethered bottlebrushes, the linker tension is by a factor of z smaller than the tension in a tethered star with the same number of arms z. In densely tethered stars, the effect of interchain distance (d) and number of arms (z) on the magnitude of linker tension is given by f ≅ f0z3/2(b/d) for stars in a solvent environment and f ≅ f0z2 (b/d)2 for dry stars, where b is the Kuhn length and f0 ≅ kBT/b is intrinsic bond tension. These relations are also valid for tethered bottlebrushes with long side chains. However, unlike molecular stars, bottlebrushes demonstrate variation of tension along the backbone f ≅ f0s z1/2 / d as a function of distance s from the free end of the backbone. In dense brushes (d≅bz) with z ≅ 1000, the backbone tension increases from f ≅ f0 = 1 pN at the free end of the backbone (s ≅ b) to its maximum f ≅ zf0 ≅ 1 nN at the linker to the substrate (s ≅ zb).
The orbital architecture and stability of the $μ$ Arae planetary system
Creators: name: Goździewski, Krzysztof
Publisher: name: arXiv
Year: 2022
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We re-analyze the global orbital architecture and dynamical stability of the $μ$ Arae planetary system. We have updated the best-fit elements and minimal masses of the planets based on literature radial velocity (RV) measurements, now spanning 15 years. This is twice the RVs interval used for the first characterization of the system in 2006. It consists of a Saturn- and two Jupiter-mass planets in low-eccentric orbits resembling the Earth-Mars-Jupiter configuration in the Solar system, as well as the close-in warm Neptune with a mass of ~14 Earth masses. Here, we constrain this early solution with the outermost period to be accurate to one month. The best-fit Newtonian model is characterized by moderate eccentricities of the most massive planets below 0.1 with small uncertainties ~0.02. It is close but meaningfully separated from the 2e:1b mean motion resonance of the Saturn-Jupiter-like pair, but may be close to weak three-body MMRs. The system appears rigorously stable over a wide region of parameter space covering uncertainties of several $σ$. The system stability is robust to a five-fold increase in the minimal masses, consistent with a wide range of inclinations, from 20 to 90 deg. This means that all planetary masses are safely below the brown dwarf mass limit. We found a weak statistical indication of the likely system inclination I~20-30 deg. Given the well constrained orbital solution, we also investigate the structure of hypothetical debris disks, which are analogs of the Main Belt and Kuiper Belt, and may naturally occur in this system.
description: Several errors in the text have been removed and references corrected and expanded. This manuscript has 23 pages (20 pages+3 pages of supplementary on-line material), 2 tables and 14+2 multi-panel figures. Accepted to Monthly Notices of the RAS. Your comments are welcome!
Properties of comet 9P/Tempel 1 dust immediately following excavation by Deep Impact
Creators: name: Nagdimunov, Lev
name: Kolokolova, Ludmilla
name: Wolff, Michael
name: A'Hearn, Michael F.
name: Farnham, Tony L.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We analyzed Deep Impact High Resolution Instrument (HRI) images acquired within the first seconds after collision of the Deep Impact impactor with the nucleus of comet 9P/Tempel 1. These images reveal an optically thick ejecta plume that casts a shadow on the surface of the nucleus. Using the 3D radiative transfer code HYPERION we simulated light scattering by the ejecta plume, taking into account multiple scattering of light from the ejecta, the surrounding nuclear surface and the actual observational geometry (including an updated plume orientation geometry that accounts for the latest 9P/Tempel 1 shape model). Our primary dust model parameters were the number density of particles, their size distribution and composition. We defined the composition through the density of an individual particle and the ratio of its material constituents, which we considered to be refractories, ice and voids. The results of our modeling indicate a dust/ice mass ratio for the ejecta particles of at least 1. To further constrain the parameters of the model, we checked for consistency between the ejecta mass resulting from our modeling with the ejecta mass estimated by the crater formation modeling. Constraining the particle size distribution by results of other studies of the Deep Impact ejecta, we find the number density of ejecta particles equal to ~10^4 particles/cm^3 at the base of the plume.
description: 21 pages, 3 figures, 2 tables; accepted for publication in PSS
Mobility of Nonsticky Nanoparticles in Polymer Liquids
Creators: name: Panyukov, Sergey
name: Rubinstein, Michael
name: Cai, Li-Heng
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2011

description: We use scaling theory to derive the time dependence of the mean-square displacement 〈Δr2〉 of a spherical probe particle of size d experiencing thermal motion in polymer solutions and melts. Particles with size smaller than solution correlation length ξ undergo ordinary diffusion (〈Δr2 (t)〉 ~ t) with diffusion coefficient similar to that in pure solvent. The motion of particles of intermediate size (ξ < d < a), where a is the tube diameter for entangled polymer liquids, is sub-diffusive (〈Δr2 (t)〉 ~ t1/2) at short time scales since their motion is affected by sub-sections of polymer chains. At long time scales the motion of these particles is diffusive and their diffusion coefficient is determined by the effective viscosity of a polymer liquid with chains of size comparable to the particle diameter d. The motion of particles larger than the tube diameter a at time scales shorter than the relaxation time τe of an entanglement strand is similar to the motion of particles of intermediate size. At longer time scales (t > τe) large particles (d > a) are trapped by entanglement mesh and to move further they have to wait for the surrounding polymer chains to relax at the reptation time scale τrep. At longer times t > τrep, the motion of such large particles (d > a) is diffusive with diffusion coefficient determined by the bulk viscosity of the entangled polymer liquids. Our predictions are in agreement with the results of experiments and computer simulations.
Discovery of SXP265, a Be/X-ray binary pulsar in the Wing of the Small Magellanic Cloud
Creators: name: Sturm, R.
name: Haberl, F.
name: Vasilopoulos, G.
name: Bartlett, E. S.
name: Maggi, P.
name: Rau, A.
name: Greiner, J.
name: Udalski, A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We identify a new candidate for a Be/X-ray binary in the XMM-Newton slew survey and archival Swift observations that is located in the transition region of the Wing of the Small Magellanic Cloud and the Magellanic Bridge. We investigated and classified this source with follow-up XMM-Newton and optical observations. We model the X-ray spectra and search for periodicities and variability in the X-ray observations and the OGLE I-band light curve. The optical counterpart has been classified spectroscopically, with data obtained at the SAAO 1.9 m telescope, and photometrically, with data obtained using GROND at the MPG 2.2 m telescope. The X-ray spectrum is typical of a high-mass X-ray binary with an accreting neutron star. We detect X-ray pulsations, which reveal a neutron-star spin period of P = (264.516+-0.014) s. The source likely shows a persistent X-ray luminosity of a few 10^35 erg/s and in addition type-I outbursts that indicate an orbital period of ~146 d. A periodicity of 0.867 d, found in the optical light curve, can be explained by non-radial pulsations of the Be star. We identify the optical counterpart and classify it as a B1-2II-IVe star. This confirms SXP 265 as a new Be/X-ray binary pulsar originating in the tidal structure between the Magellanic Clouds.
description: 11 pages, 12 figures, accepted for publication in MNRAS
Тактика ведения доношенных и недоношенных новорожденных с непрямой гипербилирубинемией (клинические рекомендации)
Creators: name: Володин Николай Николаевич
name: Дегтярев Дмитрий Николаевич
name: Дегтярева Анна Владимировна
name: Карпова Анна Львовна
name: Мебелова Инесса Исааковна
name: Пруткин Марк Евгеньевич
name: Сенькевич Ольга Александровна
name: Харламова Наталья Валерьевна
Publisher: name: Неонатология: Новости. Мнения. Обучение
Year: 2017

description: Согласованы и утверждены Российским обществом неонатологов (РОН) и Российской ассоциацией специалистов перинатальной медицины (РАСПМ) в марте 2017 г. на основании результатов коллективного обсуждения проекта клинических рекомендаций в 2016 г.
Multi-dimensional simulations of the expanding supernova remnant of SN 1987A
Creators: name: Potter, T. M.
name: Staveley-Smith, L.
name: Reville, B.
name: Ng, C. -Y.
name: Bicknell, G. V.
name: Sutherland, R. S.
name: Wagner, A. Y.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The expanding remnant from SN 1987A is an excellent laboratory for investigating the physics of supernovae explosions. There are still a large number of outstanding questions, such the reason for the asymmetric radio morphology, the structure of the pre-supernova environment, and the efficiency of particle acceleration at the supernova shock. We explore these questions using three-dimensional simulations of the expanding remnant between days 820 and 10,000 after the supernova. We combine a hydrodynamical simulation with semi-analytic treatments of diffusive shock acceleration and magnetic field amplification to derive radio emission as part of an inverse problem. Simulations show that an asymmetric explosion, combined with magnetic field amplification at the expanding shock, is able to replicate the persistent one-sided radio morphology of the remnant. We use an asymmetric Truelove & McKee progenitor with an envelope mass of $10 M_{\sun}$ and an energy of $1.5 \times 10^{44} J$. A termination shock in the progenitor's stellar wind at a distance of $0\farcs43-0\farcs51$ provides a good fit to the turn on of radio emission around day 1200. For the H\textsc{ii} region, a minimum distance of $0\farcs63\pm0\farcs01$ and maximum particle number density of $(7.11\pm1.78) \times 10^7$ m$^{-3}$ produces a good fit to the evolving average radius and velocity of the expanding shocks from day 2000 to day 7000 after explosion. The model predicts a noticeable reduction, and possibly a temporary reversal, in the asymmetric radio morphology of the remnant after day 7000, when the forward shock left the eastern lobe of the equatorial ring.
description: 31 pages, 19 figures
Self-Healing of Unentangled Polymer Networks with Reversible Bonds
Creators: name: Rubinstein, Michael
name: Stukalin, Evgeny B.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2013

description: Self-healing polymeric materials are systems that after damage can revert to their original state with full or partial recovery of mechanical strength. Using scaling theory we study a simple model of autonomic self-healing of unentangled polymer networks. In this model one of the two end monomers of each polymer chain is fixed in space mimicking dangling chains attachment to a polymer network, while the sticky monomer at the other end of each chain can form pairwise reversible bond with the sticky end of another chain. We study the reaction kinetics of reversible bonds in this simple model and analyze the different stages in the self-repair process. The formation of bridges and the recovery of the material strength across the fractured interface during the healing period occur appreciably faster after shorter waiting time, during which the fractured surfaces are kept apart. We observe the slowest formation of bridges for self-adhesion after bringing into contact two bare surfaces with equilibrium (very low) density of open stickers in comparison with self-healing. The primary role of anomalous diffusion in material self-repair for short waiting times is established, while at long waiting times the recovery of bonds across fractured interface is due to hopping diffusion of stickers between different bonded partners. Acceleration in bridge formation for self-healing compared to self-adhesion is due to excess non-equilibrium concentration of open stickers. Full recovery of reversible bonds across fractured interface (formation of bridges) occurs after appreciably longer time than the equilibration time of the concentration of reversible bonds in the bulk.
title: Simulating protein-ligand binding with neural network potentials
Creators: name: Lahey, Shae-Lynn
Publisher: name: Memorial University of Newfoundland
Year: 2021

description: Computational methods have been developed to predict the structures and energetics of protein-ligands complexes. However these methods are limited by the accuracy and transferability of the molecular mechanical (MM) models used to calculate the potential energy. Neural network potentials (NNPs) eliminate the need for parameterization and avoid many of the limiting assumptions of MM models. We evaluated the accuracy of ANI-type NNP models for predicting the potential energy surface of biaryl torsions. The ANI-2X and ANI-1ccX NNPs were found to be more accurate and reliable than popular molecular mechanical models. We then developed a new method where the NNP is used to describe the intramolecular terms of a ligand while a conventional MM model is used to describe the environment. This method was found to be effective for predicting the binding pose of ligands bound to proteins and could be used to calculate the conformational component of the binding energy. We also show that these methods can be used to re�ne low-resolution cryo-EM structures of protein-ligand complexes.
Coherent Adequate Sets and Forcing Square
Creators: name: Krueger, John
Publisher: name: arXiv
Year: 2014
Subjects: subject: Logic (math.LO)
subject: FOS: Mathematics
subject: 03E40, 03E05

description: We introduce the idea of a coherent adequate set of models, which can be used as side conditions in forcing. As an application we define a forcing poset which adds a square sequence on $ω_2$ using finite conditions.
Robust Estimation and Prediction in the Presence of Influential Units in Surveys
Creators: name: Teng, Yizhen
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 2023
Subjects: Robustness
Influential units
Conditional bias
Adaptive tuning constant

description: In surveys, one may face the problem of influential units at the estimation stage. A unit is said to be influential if its inclusion or exclusion from the sample has a drastic impact on the estimates. This is a common situation in business surveys as the distribution of economic variables tends to be highly skewed. We study and examine some commonly used estimators and predictors of a population total and propose a robust estimator and predictor based on an adaptive tuning constant. The proposed tuning constant is based on the concept of conditional bias of a unit, which is a measure of influence. We present the results of a simulation study that compares the performance of several estimators and predictors in terms of bias and efficiency.
Dallo scavo all’archivio. Le carte sulle Navi di Nemi negli archivi del Museo Nazionale Scienza e Tecnologia
Creators: name: Pietrangeli, Giovanni;Redemagni, Paola
Publisher: name: La Rivista di Engramma
Year: 2023
Subjects: Nemi ships
archival documents
Guido Ucelli
Museo Nazionale Scienza e Tecnologia Leonardo da Vinci

description: The article focuses on the documents regarding the recovery of the ancient ships in lake Nemi, near the city of Rome, preserved in the archives of the Museo Nazionale Scienza e Tecnologia Leonardo da Vinci in Milan. The ships were recovered in the Thirties of the XX century thanks to the economic and engineering effort of the Riva Calzoni hydraulic pump company and to its administrator Guido Ucelli, founder of the museum. They are kept in four different archival funds, and they regard the archaeological activity and the subsequent communication of the research. The study of these documents and of the thousands of related images will help future scholars in the study of the history of archaeological techniques and of the public use of this important discovery.
AC Josephson effect without superconductivity
Creators: name: Gaury, Benoit
name: Weston, Joseph
name: Waintal, Xavier
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Superconductivity derives its most salient features from the coherence of its macroscopic wave function. The associated physical phenomena have now moved from exotic subjects to fundamental building blocks for quantum circuits such as qubits or single photonic modes. Here, we theoretically find that the AC Josephson effect---which transforms a DC voltage $V_b$ into an oscillating signal $cos(2eV_b t/ \hbar)$---has a mesoscopic counterpart in normal conductors. We show that on applying a DC voltage $V_b$ to an electronic interferometer, there exists a universal transient regime where the current oscillates at frequency $eV_b/h$. This effect is not limited by a superconducting gap and could, in principle, be used to produce tunable AC signals in the elusive $0.1-10$ THz "terahertz gap".
description: 4 pages, 2 figures, 5 equations
MEASUREMENT OF TEMPERATURE ON THE LEG OF A LUNAR LANDER
Creators: name: Graulich, Dylan Thomas
Publisher: name: Purdue University Graduate School
Year: 2023
Subjects: classificationCode: 400102
subject: Aerospace structures
classificationCode: 400199
subject: Aerospace engineering not elsewhere classified

description: The last decade has seen a proliferation of spaceflight ventures, sparking a new commercial Space Race. Companies ranging in size from SpaceX, Blue Origin, and Virgin Galactic to startups with just a few employees have submitted designs for a Lunar Lander. As the world shifts its attention back to the Moon, reducing mass and increasing safety in these systems has become vital. One avenue to weight reduction may be the legs of the lander. This experiment measures the heating of lunar lander legs from interaction with the lander’s rocket exhaust plume. The temperature of the legs was measured using thermocouples and thermochromic paint. Thirty-two thermocouples were attached in a grid pattern to generate a temperature map of the leg. Removable thermochromic paint shields provide an immediate temperature indicator so that leg distance and angle can be quickly adjusted without having to view the thermocouple temperature data. Heat transfer is also measured on the shield, finding radiation and convection. Ground tests show that the test methods, instruments, and hardware are reliable. Ground tests also show that the most significant heating and convection in ground-leg interactions occur on the bottom foot of the lander, with little heating on the top half of the leg. Further study of this heating will be vital for the future of lunar research
Dynamic susceptibility contrast MRI with localized arterial input functions
Creators: name: Videen, Tom O.
name: Shimony, Joshua S.
name: Derdeyn, Colin P.
name: Powers, William J.
name: Snyder, Abraham Z.
name: Bretthorst, G. Larry
name: Markham, Joanne
name: Lee, John J.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2010

description: Compared to gold-standard measurements of cerebral perfusion with positron emission tomography (PET) using H2[15O] tracers, measurements with dynamic susceptibility contrast (DSC) MR are more accessible, less expensive and less invasive. However, existing methods for analyzing and interpreting data from DSC MR have characteristic disadvantages that include sensitivity to incorrectly modeled delay and dispersion in a single, global arterial input function (AIF). We describe a model of tissue microcirculation derived from tracer kinetics which estimates for each voxel a unique, localized AIF (LAIF). Parameters of the model were estimated using Bayesian probability theory and Markov-chain Monte Carlo, circumventing difficulties arising from numerical deconvolution. Applying the new method to imaging studies from a cohort of fourteen patients with chronic, atherosclerotic, occlusive disease showed strong correlations between perfusion measured by DSC MR with LAIF and perfusion measured by quantitative PET with H2[15O]. Regression to PET measurements enabled conversion of DSC MR to a physiological scale. Regression analysis for LAIF gave estimates of a scaling factor for quantitation which described perfusion accurately in patients with substantial variability in hemodynamic impairment.
All-optical formation of coherent dark states of silicon-vacancy spins in diamond
Creators: name: Pingault, Benjamin
name: Becker, Jonas N.
name: Schulte, Carsten H. H.
name: Arend, Carsten
name: Hepp, Christian
name: Godde, Tillmann
name: Tartakovskii, Alexander I.
name: Markham, Matthew
name: Becher, Christoph
name: Atature, Mete
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Spin impurities in diamond can be versatile tools for a wide range of solid-state-based quantum technologies, but finding spin impurities which offer sufficient quality in both photonic and spin properties remains a challenge for this pursuit. The silicon-vacancy center has recently attracted a lot of interest due to its spin-accessible optical transitions and the quality of its optical spectrum. Complementing these properties, spin coherence is essential for the suitability of this center as a spin-photon quantum interface. Here, we report all-optical generation of coherent superpositions of spin states in the ground state of a negatively charged silicon-vacancy center using coherent population trapping. Our measurements reveal a characteristic spin coherence time, T2*, exceeding 250 nanoseconds at 4 K. We further investigate the role of phonon-mediated coupling between orbital states as a source of irreversible decoherence. Our results indicate the feasibility of all-optical coherent control of silicon-vacancy spins using ultrafast laser pulses.
description: Additional data and analysis is available for download in PDF format at the publications section of http://www.amop.phy.cam.ac.uk/amop-ma
Thermal conductivity of hemp concretes: Variation with formulation, density and water content
Creators: name: Collet, Florence
name: Prétot, Sylvie
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: This study investigates the effect of formulation, density and water content on the thermal conductivity of hemp concretes. The investigations are based on experimental measurements and on self-consistent scheme modelling. The thermal conductivity of studied materials ranges from 90 to 160 mW/(m.K) at (23 degrees C; 50%HR). The impact of density on thermal conductivity is much more important than the impact of moisture content. It is shown that the thermal conductivity increases by about 54 % when the density increases by 2/3 while it increases by less than 15 % to 20 % from dry state to 90%RH.
A near-IR spectroscopic survey of massive jets towards EGOs
Creators: name: Garatti, A. Caratti o
name: Stecklum, B.
name: Linz, H.
name: Lopez, R. Garcia
name: Sanna, A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We aim at deriving the main physical properties of massive jets from near-IR observations, comparing them to those of a large sample of jets from low-mass YSOs, and relating them to the main features of their driving sources. We present a NIR imaging (H2 and Ks) and low-resolution spectroscopic (0.95-2.50 um) survey of 18 massive jets towards GLIMPSE extended green objects, driven by intermediate- and high-mass YSOs, which have Lbol between 4x10^2 and 10^5 Lsun. As in low-mass jets, H2 is the primary NIR coolant, detected in all the analysed flows, whereas the most important ionic tracer is [FeII], detected in half of the sampled jets. Our analysis indicates that the emission lines originate from shocks at high temperatures and densities. No fluorescent emission is detected along the flows, regardless of the source Lbol. On average, the physical parameters of these massive jets (i.e. Av, temperature, column density, mass, and luminosity) have higher values than those measured in their low-mass counterparts. The morphology of the H2 flows is varied, mostly depending on the complex, dynamic, and inhomogeneous environment in which these massive jets form and propagate. All flows and jets in our sample are collimated, showing large precession angles. Additionally, the presence of both knots and jets suggests that the ejection process is continuous with burst episodes, as in low-mass YSOs. We compare the flow H2 luminosity with the source Lbol confirming the tight correlation between these two quantities. Five sources, however, display a lower L(H2)/Lbol efficiency, which might be related to YSO evolution. Most important, the inferred L(H2) vs Lbol relationship agrees well with the correlation between the momentum flux of the CO outflows and the bolometric luminosities of high-mass YSOs indicating that outflows from high-mass YSOs are momentum driven, as are their low-mass counterparts.
description: Accepted for publication on A&A. High resolution figures published on the main journal (see Astronomy & Astrophysics: Forthcoming)
Utilization of Waste Glass as Partial Replacement of Fine Aggregate in Concrete
Creators: name: Khoso, Salim
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 400505
subject: Construction materials
classificationCode: 400504
subject: Construction engineering
classificationCode: 400507
subject: Fire safety engineering
classificationCode: 400510
subject: Structural engineering

description: The aim of this study is to improve the strength of concrete made by partial replacement of fine aggregate with waste glass. The fine aggregate was replaced by waste glass as (0-40%) with dosage of 4% using constant water-binder ratio as 0.45. Two sizes of waste glass fine aggregate (WGFA1) passing from 1.71 mm sieve and retained from 1.19 mm sieve and WGFA2 size passing from 1.19 mm sieve and retained from 0.5 mm sieve were used as partial replacement of hill sand. One mixture of control concrete and twenty mixtures of modified concrete prepared with partial replacement of fine aggregate with two different sizes of waste glass were prepared. The workability, water absorption, density and compressive strength of control and modified concretes were tested. The experimental test results revealed that maximum improvement was observed at 12% replacement of hill sand with waste glass on all investigated properties of concrete. Moreover, better improvement was observed with replacement of hill sand with waste glass fine aggregate WGFA1 than that of WGFA2.
Semiclassical Virasoro Symmetry of the Quantum Gravity S-Matrix
Creators: name: Kapec, Daniel
name: Lysov, Vyacheslav
name: Pasterski, Sabrina
name: Strominger, Andrew
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: It is shown that the tree-level S-matrix for quantum gravity in four-dimensional Minkowski space has a Virasoro symmetry which acts on the conformal sphere at null infinity.
description: 22 pages, 1 figure
Improving the Moment Approach for Astrometric Binaries: Possible Application to Cygnus X-1
Creators: name: Yamada, Kei
name: Yamaguchi, Masaki
name: Asada, Hideki
name: Gouda, Naoteru
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: A moment approach for orbit determinations of astrometric binaries from astrometric observations alone has been recently studied for a low signal-to-noise ratio (Iwama et al. 2013, PASJ, 65, 2). With avoiding a direct use of the time-consuming Kepler equation, temporal information is taken into account to increase the accuracy of statistical moments. As numerical tests, 100 realizations are done and the mean and the standard deviation are also evaluated. For a semi-major axis, the difference between the mean of the recovered values and the true value decreases to less than a tenth in the case of $10000$ observed points. Therefore, the present moment approach works better than the previous one for the orbit determinations when one has a number of the observed points. The present approach is thus applicable to Cyg X-1.
description: 15 pages, 3 figures, 4 table; accepted by PASJ
Bibliografia aggiornata sulle Navi di Nemi, il Museo delle Navi romane, e il territorio nemorense
Creators: name: Incutti, Agostina;Toson, Christian
Publisher: name: La Rivista di Engramma
Year: 2023
Subjects: Nemi ships
Nemi ships Museum
Nemi Landscape

description: The updated bibliography on the Nemi ships, the Museum of Roman ships and the Nemi area is published here. This bibliography is intended to be an update of the bibliography published by Lucilla Mariani, Le navi di Nemi nella bibliografia, edited in 1942, which has more than 1700 titles. Therefore, the pre-1942 bibliography is not complete, but contains a selection of significant titles.
Hyperpolarized 13 C spectroscopy and an NMR-compatible bioreactor system for the investigation of real-time cellular metabolism
Creators: name: Dewar, Brian J.
name: Van Criekinge, Mark
name: Jeffries, Rex E.
name: Zierhut, Matthew
name: Keshari, Kayvan R.
name: Kurhanewicz, John
name: Wilson, David M.
name: Macdonald, Jeffrey M.
name: Vigneron, Daniel B.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2010

description: The purpose of this study was to combine a three-dimensional NMR-compatible bioreactor with hyperpolarized 13C NMR spectroscopy in order to probe cellular metabolism in real time. JM1 (immortalized rat hepatoma) cells were cultured in a three-dimensional NMR-compatible fluidized bioreactor. 31P spectra were acquired before and after each injection of hyperpolarized [1-13C] pyruvate and subsequent 13C spectroscopy at 11.7 T. 1H and two-dimensional 1H-1H-total correlation spectroscopy spectra were acquired from extracts of cells grown in uniformly labeled 13C-glucose, on a 16.4 T, to determine 13C fractional enrichment and distribution of 13C label. JM1 cells were found to have a high rate of aerobic glycolysis in both two-dimensional culture and in the bioreactor, with 85% of the 13C label from uniformly labeled 13C-glucose being present as either lactate or alanine after 23 h. Flux measurements of pyruvate through lactate dehydrogenase and alanine aminotransferase in the bioreactor system were 12.18 ± 0.49 nmols/sec/108 cells and 2.39 ± 0.30 nmols/sec/108 cells, respectively, were reproducible in the same bioreactor, and were not significantly different over the course of 2 days. Although this preliminary study involved immortalized cells, this combination of technologies can be extended to the real-time metabolic exploration of primary benign and cancerous cells and tissues prior to and after therapy.
Radiating Kerr-like regular black hole
Creators: name: Ghosh, Sushant G.
name: Maharaj, Sunil D.
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We derive a radiating regular rotating black hole solution, radiating Kerr-like regular black hole solution. We achieve this by starting from the Hayward regular black hole solution via a complex transformation suggested by Newman-Janis. The radiating Kerr metric, the Kerr-like regular black hole and the standard Kerr metric are regained in the appropriate limits. The structure of the horizon-like surfaces are also determined.
description: 9 pages. arXiv admin note: text overlap with arXiv:1208.3028
Proceedings 7th Workshop on Programming Language Approaches to Concurrency and Communication-cEntric Software
Creators: name: Donaldson, Alastair F.
name: Vasconcelos, Vasco T.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Programming Languages (cs.PL)
subject: FOS: Computer and information sciences

description: This volume contains the post-proceedings of PLACES 2014, the seventh Workshop on Programming Language Approaches to Concurrency and Communication-cEntric Software, which was held in Grenoble, France, on April 12th 2014, and co-located with ETAPS, the European Joint Conferences on Theory and Practice of Software. The PLACES workshop series aims to offer a forum where researchers from different fields exchange new ideas on one of the central challenges for programming in the near future: the development of programming languages, methodologies and infrastructures where concurrency and distribution are the norm rather than a marginal concern. Previous editions of PLACES were held in Rome (2013), Tallin (2012), Saarbrueken (2011), Paphos (2010) and York (2009), all co-located with ETAPS, and the first PLACES was held in Oslo and co-located with DisCoTec (2008). The Program Committee, after a careful and thorough reviewing process, selected nine papers out of 12 submissions for presentation at the workshop and inclusion in this post-proceedings. Each submission was evaluated by three referees (with one paper receiving a fourth review), and the accepted papers were selected during a week-long electronic discussion. One of the nine accepted papers was conditionally accepted subject to a process of shepherding by a PC member, which was successful and led to the paper's full acceptance. In addition to the contributed papers, the workshop will feature an invited talk by Akash Lal, Microsoft Research India, entitled "Finding Concurrency Bugs Under Imprecise Harnesses".
Exploring satisfaction among women having a First Nations baby at one of three maternity hospitals offering culturally specific continuity of midwife care in Victoria, Australia: A cross-sectional survey
Creators: name: McCalman, Pamela
name: Forster, Della
name: Springall, Tanisha
name: Newton, Michelle
name: McLardie-Hore, Fiona
name: McLachlan, Helen
Publisher: name: La Trobe
Year: 2023
Subjects: classificationCode: 4204
subject: Midwifery
classificationCode: 3215
subject: Reproductive medicine
classificationCode: 450413
subject: Aboriginal and Torres Strait Islander midwifery and paediatrics
classificationCode: 420403
subject: Psychosocial aspects of childbirth and perinatal mental health

description: Background: Continuity of midwife care is recommended to redress the inequitable perinatal outcomes experienced by Aboriginal and Torres Strait Islander (First Nations) mothers and babies, however more evidence is needed about First Nations women's views and experiences of their care. Aims: This study aimed to explore levels of satisfaction among women having a First Nations baby, who received maternity care at one of three maternity services, where new culturally specific midwife continuity models had been recently implemented. Methods: Women having a First Nations baby who were booked for care at one of three study sites in Naarm (Melbourne), Victoria, were invited to complete one questionnaire during pregnancy and then a follow up questionnaire, 3 months after the birth. Results: Follow up questionnaires were completed by 213 women, of whom 186 had received continuity of midwife care. Most women rated their pregnancy (80 %) and labour and birth care (81 %) highly (‘6 or ‘7′ on a scale of 1–7). Women felt informed, that they had an active say in decisions, that their concerns were taken seriously, and that the midwives were kind, understanding and there when needed. Ratings of inpatient postnatal care were lower (62 %), than care at home (87 %). Conclusions: Women having a First Nations baby at one of three maternity services, where culturally specific, continuity of midwife care models were implemented reported high levels of satisfaction with care. It is recommended that these programs are upscaled, implemented and sustained.
Size-optimized 32-channel brain arrays for 3 T pediatric imaging
Creators: name: McNab, Jennifer A.
name: Lin, Weili
name: Fujimoto, Kyoko
name: Dilks, Daniel D.
name: Triantafyllou, Christina
name: Wald, Lawrence L.
name: Grant, P. Ellen
name: Alagappan, Vijay
name: Tountcheva, Veneta
name: Kanwisher, Nancy
name: Keil, Boris
name: Mareyam, Azma
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2011

description: Size-optimized 32-channel receive array coils were developed for five age groups, neonates, 6 months old, 1 year old, 4 years old, and 7 years old, and evaluated for pediatric brain imaging. The array consisted of overlapping circular surface coils laid out on a close-fitting coil-former. The two-section coil former design was obtained from surface contours of aligned three-dimensional MRI scans of each age group. Signal-to-noise ratio and noise amplification for parallel imaging were evaluated and compared to two coils routinely used for pediatric brain imaging; a commercially available 32-channel adult head coil and a pediatric-sized birdcage coil. Phantom measurements using the neonate, 6-month-old, 1-year-old, 4-year-old, and 7-year-old coils showed signal-to-noise ratio increases at all locations within the brain over the comparison coils. Within the brain cortex the five dedicated pediatric arrays increased signal-to-noise ratio by up to 3.6-, 3.0-, 2.6-, 2.3-, and 1.7-fold, respectively, compared to the 32-channel adult coil, as well as improved G-factor maps for accelerated imaging. This study suggests that a size-tailored approach can provide significant sensitivity gains for accelerated and unaccelerated pediatric brain imaging.