cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Infrared emission of $z \sim 6$ galaxies: AGN imprints
Creators: name: Di Mascia, F.
name: Gallerani, S.
name: Behrens, C.
name: Pallottini, A.
name: Carniani, S.
name: Ferrara, A.
name: Barai, P.
name: Vito, F.
name: Zana, T.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We investigate the infrared (IR) emission of high-redshift ($z\sim 6$), highly star-forming (${ {\rm SFR} > 100}$ $M_{\rm \odot} {\rm yr}^{-1}$) galaxies, with/without Active Galactic Nuclei (AGN), using a suite of cosmological simulations featuring dust radiative transfer. Synthetic Spectral Energy Distributions (SEDs) are used to quantify the relative contribution of stars/AGN to dust heating. In dusty (${M_{\rm d}\gtrsim 3\times 10^7 M_{\rm \odot}}$) galaxies, $\gtrsim 50-90 \%$ of the UV radiation is obscured by dust inhomogeneities on scales ${\gtrsim 100}$ pc. In runs with AGN, a clumpy, warm ($\approx 250$ K) dust component co-exists with a colder ($\approx 60$ K) and more diffuse one, heated by stars. Warm dust provides up to ${50 \%}$ of the total IR luminosity, but only $\lesssim 0.1 \%$ of the total mass content. The AGN boosts the MIR flux by ${10-100 \times}$ with respect to star forming galaxies, without significantly affecting the FIR. Our simulations successfully reproduce the observed SED of bright (${M_{\rm UV}\sim -26}$) ${z\sim 6}$ quasars, and show that these objects are part of complex, dust-rich merging systems, containing multiple sources (accreting BHs and/or star forming galaxies) in agreement with recent HST and ALMA observations. Our results show that the proposed ORIGINS missions will be able to investigate the MIR properties of dusty star forming galaxies and to obtain good quality spectra of bright quasars at $z\sim 6$. Finally, the MIR-to-FIR flux ratio of faint (${M_{\rm UV}\sim -24}$) AGN is ${>10\times}$ higher than for normal star forming galaxies. This implies that combined JWST/ORIGINS/ALMA observations will be crucial to identify faint and/or dust-obscured AGN in the distant Universe.
description: 22 pages, 13 figures, accepted for publication on MNRAS
Interaction of vortices in thin superconducting films and Berezinskii-Kosterlitz-Thouless transition
Creators: name: Kogan, V. G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The precondition for the BKT transition in thin superconducting films, the logarithmic intervortex interaction, is satisfied at distances short relative to $Λ=2λ^2/d$, $λ$ is the London penetration depth of the bulk material and $d$ is the film thickness. For this reason, the search for the transition has been conducted in samples of the size $L
description: 4 pages, no figures
Non-universality of the mass function: dependence on the growth rate and power spectrum shape
Creators: name: Ondaro-Mallea, Lurdes
name: Angulo, Raul E.
name: Zennaro, Matteo
name: Contreras, Sergio
name: Aricò, Giovanni
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The abundance of dark matter haloes is one of the key probes of the growth of structure and expansion history of the Universe. Theoretical predictions for this quantity usually assume that, when expressed in a certain form, it depends only on the mass variance of the linear density field. However, cosmological simulations have revealed that this assumption breaks, leading to 10-20% systematic effects. In this paper we employ a specially-designed suite of simulations to further investigate this problem. Specifically, we carry out cosmological N-body simulations where we systematically vary growth history at a fixed linear density field, or vary the power spectrum shape at a fixed growth history. We show that the halo mass function generically depends on these quantities, thus showing a clear signal of non-universality. Most of this effect can be traced back to the way in which the same linear fluctuation grows differently into the nonlinear regime depending on details of its assembly history. With these results, we propose a parameterization with explicit dependence on the linear growth rate and power spectrum shape. Using an independent suite of simulations, we show that this fitting function accurately captures the mass function of haloes over cosmologies spanning a vast parameter space, including massive neutrinos and dynamical dark energy. Finally, we employ this tool to improve the accuracy of so-called cosmology-rescaling methods and show they can deliver 2% accurate predictions for the halo mass function over the whole range of currently viable cosmologies.
Wave packets in QFT: leading order width corrections to decay rates and clock behaviour under Lorentz boosts
Creators: name: Edery, Ariel
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Decay rates in quantum field theory (QFT) are typically calculated assuming the particles are represented by momentum eigenstates (i.e. plane waves). However, strictly speaking, localized free particles should be represented by wave packets. This yields width corrections to the decay rate and to the clock behaviour under Lorentz boosts. We calculate the decay rate of a particle of mass $M$ modeled as a Gaussian wavepacket of width $a$ and centered at zero momentum. We find the decay rate to be $Γ_0 \big[1- \frac{3 a^2}{4 M^2} +\mathcal{O}\big(\tfrac{a^4}{M^4}\big)\big]$ where $Γ_0$ is the decay rate of the particle at rest treated as a plane wave. The leading correction is then of order $\tfrac{a^2}{M^2}$. We then perform a Lorentz boost of velocity $v$ on the above Gaussian and find that its decay rate does not decrease \textit{exactly} by the Lorentz factor $\sqrt{1-v^2}$. There is a correction of order $\tfrac{a^2v^2}{M^2}$. Therefore, the decaying wave packet does not act exactly like a typical clock under Lorentz boosts and we refer to it is a "WP clock" (wave packet clock). A WP clock does not move with a single velocity relative to an observer but has a spread in velocities (more specifically, a spread in momenta). Nonetheless, it is best viewed as a single clock as the wave packet represents a one-particle state in QFT. WP clocks do not violate Lorentz symmetry and are not based on new physics: they are a consequence of the combined requirements of special relativity, quantum mechanics and \textit{localized} free particles.
description: 15 pages
Infinitely Many Stochastically Stable Attractors
Creators: name: Araujo, Vitor
Publisher: name: arXiv
Year: 2006
Subjects: subject: Dynamical Systems (math.DS)
subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 37A99, 37C40, 37C50, 37H99

description: Let f be a diffeomorphism of a compact finite dimensional boundaryless manifold M exhibiting infinitely many coexisting attractors. Assume that each attractor supports a stochastically stable probability measure and that the union of the basins of attraction of each attractor covers Lebesgue almost all points of M. We prove that the time averages of almost all orbits under random perturbations are given by a finite number of probability measures. Moreover these probability measures are close to the probability measures supported by the attractors when the perturbations are close to the original map f.
description: 14 pages, 2 figures
Intestinal gluconeogenesis and glucose transport according to body fuel availability in rats
Creators: name: Habold, Caroline
name: Foltzer-Jourdainne, Charlotte
name: Maho, Yvon Le
name: Lignot, Jean-Hervé
name: Oudart, Hugues
Publisher: name: arXiv
Year: 2007
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: FOS: Biological sciences

description: Intestinal hexose absorption and gluconeogenesis have been studied in relation to refeeding after two different fasting phases: a long period of protein sparing during which energy expenditure is derived from lipid oxidation (phase II), and a later phase characterized by a rise in plasma corticosterone triggering protein catabolism (phase III). Such a switch in body fuel uses, leading to changes in body reserves and gluconeogenic precursors, could modulate intestinal gluconeogenesis and glucose transport. The gene and protein levels, and the cellular localization of the sodium-glucose cotransporter SGLT1, and of GLUT5 and GLUT2, as well as that of the key gluconeogenic enzymes phosphoenolpyruvate carboxykinase (PEPCK) and glucose-6-phosphatase (Glc6Pase) were measured. PEPCK and Glc6Pase activities were also determined. In phase III fasted rats, SGLT1 was up-regulated and intestinal glucose uptake rates were higher than in phase II fasted and fed rats. PEPCK and Glc6Pase mRNA, protein levels and activities also increased in phase III. GLUT5 and GLUT2 were down-regulated throughout the fast, but increased after refeeding, with GLUT2 recruited to the apical membrane. The increase in SGLT1 expression during phase III may allow glucose absorption at low concentrations as soon as food is available. Furthermore, an increased epithelial permeability due to fasting may induce a paracellular movement of glucose. In the absence of intestinal GLUT2 during fasting, Glc6Pase could be involved in glucose release to the bloodstream via membrane trafficking. Finally, refeeding triggered GLUT2 and GLUT5 synthesis and apical recruitment of GLUT2, to absorb larger amounts of hexoses.
Uniqueness Results for Nonlocal Hamilton-Jacobi Equations
Creators: name: Barles, Guy
name: Cardaliaguet, Pierre
name: Ley, Olivier
name: Monteillet, Aurélien
Publisher: name: arXiv
Year: 2008
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 49L25, 35F25, 35A05, 35D05, 35B50, 45G10

description: We are interested in nonlocal Eikonal Equations describing the evolution of interfaces moving with a nonlocal, non monotone velocity. For these equations, only the existence of global-in-time weak solutions is available in some particular cases. In this paper, we propose a new approach for proving uniqueness of the solution when the front is expanding. This approach simplifies and extends existing results for dislocation dynamics. It also provides the first uniqueness result for a Fitzhugh-Nagumo system. The key ingredients are some new perimeter estimates for the evolving fronts as well as some uniform interior cone property for these fronts.
X-raying the galaxy pair Arp 41: no collision in NGC 1232 and three ultraluminous sources in NGC 1232A
Creators: name: Soria, Roberto
name: Pakull, Manfred W.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We studied the apparent galaxy pair NGC 1232 / NGC 1232A with Chandra, looking for evidence of interactions and collisions. We report that there is no cloud of diffuse emission in NGC 1232, contrary to previous claims in the literature. Instead, we find that the small "companion" galaxy NGC 1232A contains three ultraluminous X-ray sources (ULXs) with peak 0.3-10 keV luminosities above 10^{40} erg/s (assuming a cosmological distance of 93 Mpc for this galaxy). For its mass, morphology, metal abundance and bright ULX population, NGC 1232A is analogous to the more nearby late-type spiral NGC 1313.
description: 8 pages, 3.5 MB, accepted by MNRAS (17 Feb 2021)
Global Existence Results and Uniqueness for Dislocation Equations
Creators: name: Barles, Guy
name: Cardaliaguet, Pierre
name: Ley, Olivier
name: Monneau, Regis
Publisher: name: arXiv
Year: 2007
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 49L25, 35F25, 35A05, 35D05, 35B50, 45G10

description: We are interested in nonlocal Eikonal Equations arising in the study of the dynamics of dislocations lines in crystals. For these nonlocal but also non monotone equations, only the existence and uniqueness of Lipschitz and local-in-time solutions were available in some particular cases. In this paper, we propose a definition of weak solutions for which we are able to prove the existence for all time. Then we discuss the uniqueness of such solutions in several situations, both in the monotone and non monotone case.
The Minimum Testable Abundance of Primordial Black Holes at Future Gravitational-Wave Detectors
Creators: name: De Luca, V.
name: Franciolini, G.
name: Pani, P.
name: Riotto, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The next generation of gravitational-wave experiments, such as Einstein Telescope, Cosmic Explorer and LISA, will test the primordial black hole scenario. We provide a forecast for the minimum testable value of the abundance of primordial black holes as a function of their masses for both the unclustered and clustered spatial distributions at formation. In particular, we show that these instruments may test abundances, relative to the dark matter, as low as $10^{-10}$.
description: 11 pages, 5 figures
Budget Impact Analysis of liposomial Irinotecan plus 5-FU/LV for pancreatic cancer treatment, following progression on Gemcitabine related therapies, in the Greek healthcare setting
Creators: name: Χοτζαγιάννογλου, Βασιλική Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Κλινική Φαρμακολογία
Βιομηχανική Φαρμακολογία
Κλινική Τοξικολογία
Καταγραφή
Clinical Pharmacology
Industrial Pharmacology
Clinical Toxicology
Reference

description: Pancreatic cancer (PC) is a deadly disease, generally discovered at a late stage and resistant to chemotherapy and radiation therapy. Standard first-line therapies are combinations of gemcitabine-based chemotherapy, nab-paclitaxel/gemcitabine or, for the best performing patients, the FOLFIRINOX regimen containing 5-fluorouracil (5-FU), Oxaliplatin, Irinotecan and folinic acid. Nal-IRI is the only licensed and approved therapy for second-line treatment of mPaCa after disease progression following gemcitabine-based therapy, based on the results of the NAPOLI-1 phase III trial. To understand the economic value of nal-IRI in mPaCa, a local BIM was developed, in order to investigate the BI of the introduction of nal-IRI to the Greek healthcare system. Over the 5-year time horizon, in the baseline scenario, the number of eligible Greek patients was 485 and those who received nal-IRI were 19, 116, 189, 210, 210 in years 1 to 5, respectively. The annual incremental cost associated with the introduction of nal-IRI over its comparators was €123,945, €761,063, €1,239,453, €1,380,789, €1,380,789 for years 1 to 5 respectively, resulting in a total 5-year budget impact of €4,886,039.
description: Ο καρκίνος του παγκρέατος (PC) είναι μια θανατηφόρα ασθένεια, που διαγιγνώσκεται συνήθως σε μεταγενέστερο στάδιο και είναι πολύ ανθεκτική στη χημειοθεραπεία και την ακτινοθεραπεία. Οι συνήθεις θεραπείες πρώτης γραμμής είναι συνδυασμοί χημειοθεραπείας με βάση τη γεμσιταβίνη, nab-πακλιταξέλη / γεμσιταβινη ή, για τους ασθενείς με βέλτιστη απόδοση, το σχήμα FOLFIRINOX που περιέχει 5-φθοριοουρακίλη (5-FU), οξαλιπλατίνη, ιρινοτεκάνη και φολινικό οξύ. Η nal-IRI είναι η μοναδική εγκεκριμένη θεραπεία δεύτερης γραμμής του mPaCa μετά απο θεραπεία με γεμσιταβίνη. Προκειμένου να κατανοηθεί η οικονομική αξία του nal-IRI στο μεταστατικό αδενοκαρκίνωμα του παγκρέατος, αναπτύχθηκε ένα τοπικό BIM. Το ετήσιο αυξητικό κόστος που συνδέεται με την εισαγωγή του nal-IRI έναντι των ανταγωνιστών του στο ελληνικό σύστημα υγείας είναι €123,945, €761,063, €1,239,453, €1,380,789 και €1,380,789 για τα έτη 1 έως 5 αντίστοιχα, με συνολικό ετήσιο αντίκτυπο στον προϋπολογισμό € 4,886,039.
Individual-based model for coevolving competing populations
Creators: name: Charret, I. C.
name: Louzada, J. N. C.
name: Costa, A. T.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: FOS: Biological sciences

description: Classical models for competition between two species usually predict exclusion or divergent evolution of resource exploitation. However, recent experimental data show that coexistence is possible for very similar species competing for the same resources \textit{without} niche partition. Motivated by this experimental challenge to classical competition theory, we propose an individual-based stochastic competition model, which is essentially a modification of a deterministic Lotka-Volterra type model. The proposed model of competition dynamics incorporates the effects of a discrete genotype, which determines the individual's adaptation to the environment, as well as its interaction with the other species.
description: 11 pages and 4 figures
On the origin of GeV spectral break for Fermi blazars: 3C 454.3
Creators: name: Kang, Shi-Ju
name: Zheng, Yong-Gang
name: Wu, Qingwen
name: Chen, Liang
name: Yin, Yue
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The GeV break in spectra of the blazar 3C 454.3 is a special observation feature that has been discovered by the {\it Fermi}-LAT. The origin of the GeV break in the spectra is still under debate. In order to explore the possible source of GeV spectral break in 3C 454.3, a one-zone homogeneous leptonic jet model, as well as the {\it McFit} technique are utilized for fitting the quasi-simultaneous multi-waveband spectral energy distribution (SED) of 3C 454.3. The outside border of the broad-line region (BLR) and inner dust torus are chosen to contribute radiation in the model as external, seed photons to the external-Compton process, considering the observed $γ$-ray radiation. The combination of two components, namely the Compton-scattered BLR and dust torus radiation, assuming a broken power-law distribution of emitted particles, provides a proper fitting to the multi-waveband SED of 3C 454.3 detected 2008 Aug 3 - Sept 2 and explains the GeV spectral break. We propose that the spectral break of 3C 454.3 may originate from an inherent break in the energy distribution of the emitted particles and the Klein-Nishina effect. A comparison is performed between the energy density of the 'external' photon field for the whole BLR $U_{\rm BLR}$ achieved via model fitting and that constrained from the BLR data. The distance from the position of the $γ$-ray radiation area of 3C 454.3 to the central black hole could be constrained at $\sim 0.78$pc ($\sim 4.00 R_{\rm BLR}$, the size of the BLR).
description: Accepted for publication in MNRAS. 7 pages, 2 figures, 1 table
Jet evolution in the N=4 SYM plasma at strong coupling
Creators: name: Hatta, Y.
name: Iancu, E.
name: Mueller, A. H.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Within the framework of the AdS/CFT correspondence, we study the time evolution of an energetic R-current propagating through a finite temperature, strongly coupled, N=4 SYM plasma and propose a physical picture for our results. In this picture, the current splits into a pair of massless partons, which then evolve via successive branchings, in such a way that energy is quasi-democratically divided among the products of a branching. We point out a duality between the transverse size of the partonic system produced through branching and the radial distance traveled by the dual Maxwell wave in the AdS geometry. For a time-like current, the branching occurs already in the vacuum, where it gives rise to a system of low-momentum partons isotropically distributed in the transverse plane. But at finite temperature, the branching mechanism is modified by the medium, in that the rate for parton splitting is enhanced by the transfer of transverse momentum from the partons to the plasma. This mechanism, which controls the parton energy loss, is sensitive to the energy density in the plasma, but not to the details of the thermal state. We compute the lifetime of the current for various kinematical regimes and provide physical interpretations for other, related, quantities, so like the meson screening length, the drag force, or the trailing string, that were previously computed via AdS/CFT techniques.
description: 37 pages, 4 figures
Law and Disability ‘Supported’ Employment in Australia: The Case for Ending Segregation, Discrimination, Exploitation and Violence against People with Disability at Work
Creators: name: Steele, Linda
Publisher: name: Monash University
Year: 2024
Subjects: classificationCode: 480707
subject: Welfare, insurance, disability and social security law

description: This article argues for transition away from Australian Disability Enterprises (‘ADEs’) on the basis that they further segregation, discrimination, exploitation and violence against people with disability. ADEs (previously ‘sheltered workshops’) overwhelmingly impact people with intellectual and cognitive disability. In ADEs, employees with disability receive less than award wages. They work in segregated settings where they are separate from and in unequal relationships with employees without disability. While sometimes framed as an opportunity for skills development, ADE employees with disability are unlikely to move into open employment. Currently, a variety of laws across diverse domains, including disability services law, industrial relations law and guardianship law, provide legal basis for ADEs as necessary and beneficial to people with disability and organisations that operate ADEs receiving financial benefit from the unequal treatment of ADE employees with disability. Legal institutions with authority to help dismantle ADEs — the Commonwealth legislature, the Fair Work Commission (‘FWC’) and Federal Court — have further entrenched ADEs in law by dismissing claims that they are harmful to people with disability. Ultimately, the article provides a basis for the need for law reform to transition away from ADEs in a broader context of enhancing dignity, equality and self-determination of people with disability.
Modified Curie-Weiss Law for $j_{\rm eff}$ Magnets
Creators: name: Li, Ying
name: Winter, Stephen M.
name: Kaib, David A. S.
name: Riedl, Kira
name: Valenti, Roser
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: In spin-orbit-coupled magnetic materials, the usually applied Curie-Weiss law can break down. This is due to potentially sharp temperature-dependence of the local magnetic moments. We therefore propose a modified Curie-Weiss formula suitable for analysis of experimental susceptibility. We show for octahedrally coordinated materials of $d^5$ filling that the Weiss constant obtained from the improved formula is in excellent agreement with the calculated Weiss constant from microscopic exchange interactions. Reanalyzing the measured susceptibility of several Kitaev candidate materials with the modified formula resolves apparent discrepancies between various experiments regarding the magnitude and anisotropies of the underlying magnetic couplings.
A Scaling Index Analysis of the WMAP three year data: Signatures of non-Gaussianities and Asymmetries in the CMB
Creators: name: Raeth, C.
name: Schuecker, P.
name: Banday, A. J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Local scaling properties of the co-added foreground-cleaned three-year Wilkinson Microwave Anisotropy Probe (WMAP) data are estimated using weighted scaling indices. The scaling index method (SIM) is - for the first time - adapted and applied to the case of spherical symmetric spatial data. The results are compared with 1000 Monte Carlo simulations based on Gaussian fluctuations with a best fit $Λ$CDM power spectrum and WMAP-like beam and noise properties. Statistical quantities based on the scaling indices, namely the moments of the distribution and probability-based measures are determined. We find for most of the test statistics significant deviations from the Gaussian hypothesis. We find pronounced asymmetries, which can be interpreted as a global lack of structure in the northern hemisphere, which is consistent with previous findings. Furthermore, we detect a localized anomaly in the southern hemisphere, which gives rise to highly significant signature for non-Gaussianity in the spectrum of scaling indices. We identify this signature as the cold spot, which was also already detected in the first year WMAP data. Our results provide further evidence for both the presence of non-Gaussianities and asymmetries in the WMAP three-year data. More detailed bandand year-wise analyses are needed to elucidate the origin of the detected anomalies. In either case the scaling indices provide powerful nonlinear statistics to analyse CMB maps.
description: submitted to MNRAS
Σύνθεση και χαρακτηρισμός νανοσύνθετων υλικών με βάση τον πολύ(2-υδροξυπρόπυλο μεθακρυλικό εστέρα) και νανοσωματίδια χιτοζάνης με ενθυλακωμένο αιθέριο έλαιο ελιχρύσου
Creators: name: Χατζημιχαηλίδου, Στέλλα Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Πολύ(2-υδροξυπρόπυλο μεθακρυλικός εστέρας)
Ελίχρυσος
Νανοενθυλάκωση
Poly(2-hydroxypropyl methacrylate)
Helichrysum
Nanoencapsulation

description: Στην παρούσα διπλωματική εργασία, συντέθηκαν νανοσύνθετα υλικά πολυμερικής μήτρας πολύ(2-υδροξυπροπυλο) μεθακρυλικού εστέρα], PHPMA, με νανο-ενθυλακωμένο σε χιτοζάνη αιθέριο έλαιο ελιχρύσου. Τα δείγματα εξετάστηκαν με πλήθος εργαστηριακών τεχνικών, όπως Διαφορική Θερμιδομετρία Σάρωσης (Differential scanning calorimetry) DSC, Θερμοσταθμική Ανάλυση (Thermogravimetric Analysis) TGA και Υπέρυθρη φασματοσκοπία με μειωμένη ολική ανάκλαση (Horizontal attenuated total reflectance) HATR-FTIR, ενώ πραγματοποιήθηκε μελέτη της αντιοξειδωτικής τους δράσης με τη μέθοδο DPPH και τη χρήση Φασματοσκοπίας υπεριώδους ορατού (Ultraviolet-visible spectroscopy) UV-VIS. Τα αποτελέσματα του HATR FT IR έδειξαν πως λόγω της μικρής ποσότητας αιθέριου ελαίου δεν εμφανίζονται οι χαρακτηριστικές του κορυφές, είναι εμφανής όμως η ενσωμάτωση της χιτοζάνης στην πολυμερική μήτρα. Η αντιοξειδωτική δράση του υλικού εμφάνισε σημαντική αύξηση με την προσθήκη των νανοσύνθετων και αυξημένη διάρκεια λόγω της ενθυλάκωσης του αιθέριου ελαίου στη χιτοζάνη. Από την θερμοσταθμική ανάλυση, συμπεράθηκε η διασπορά των νανοσφαιριδίων της χιτοζάνης στις αλυσίδες του πολυμερούς παρεμπόδισε τη θερμική κίνηση των μορίων, με αποτέλεσμα να αυξηθεί η θερμική σταθερότητα με την αύξηση της ποσότητας των δειγμάτων σε νανοσφαιρίδια. Τέλος, από τη μέθοδο της διαφορικής θερμιδομετρίας σάρωσης υπολογίστηκε η θερμοκρασία υαλώδους μετάπτωσης Tg η οποία έδειξε σημαντική μείωση με την αύξηση της ποσότητας νανοσύνθετου και της περιεκτικότητας του σε αιθέριο έλαιο.
description: In this study, nanocomposites of poly(2-hydroxypropyl methacrylate), with helichrysum stoechas essential oil nanoencapsulated in chitosan were prepared. A big variety of techniques such as DSC, TGA and HATR-FTIR were used to investigate the properties of nanocomposites, while antioxidant activity of the samples was evaluated using DPPH (2,2-diphenyl-1-picrylhydrazyl) method and UV-VIS. Results of FT IR showed that, due to the small amount of the essential oil, no additional peaks can be observed, apart from the chitosan’s. The results of DPPH method showed that incorporation of the essential oil on the polymeric matrix enhanced the antioxidant activity of the nanocomposites, while the nanoencapsulation enhanced the duration of the antioxidant activity. Thermogravimetric analysis showed that the presence of nanocomposites enhanced the thermal stability of the nanocomposites. Finally, the glass transition temperature was found to decrease with the amount of chitosan-essential oil nanocomposites.
A Near-Infrared Chemical Inventory of the Atmosphere of 55 Cancri e
Creators: name: Deibert, Emily K.
name: de Mooij, Ernst J. W.
name: Jayawardhana, Ray
name: Ridden-Harper, Andrew
name: Sivanandam, Suresh
name: Karjalainen, Raine
name: Karjalainen, Marie
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We present high-resolution near-infrared spectra taken during eight transits of 55 Cancri e, a nearby low-density super-Earth with a short orbital period (< 18 hours). While this exoplanet's bulk density indicates a possible atmosphere, one has not been detected definitively. Our analysis relies on the Doppler cross-correlation technique, which takes advantage of the high spectral resolution and broad wavelength coverage of our data, to search for the thousands of absorption features from hydrogen-, carbon-, and nitrogen-rich molecular species in the planetary atmosphere. Although we are unable to detect an atmosphere around 55 Cancri e, we do place strong constraints on the levels of HCN, NH${}_3$, and C${}_2$H${}_2$ that may be present. In particular, at a mean molecular weight of 5 amu we can rule out the presence of HCN in the atmosphere down to a volume mixing ratio (VMR) of 0.02%, NH${}_3$ down to a VMR of 0.08%, and C${}_2$H${}_2$ down to a VMR of 1.0%. If the mean molecular weight is relaxed to 2 amu, we can rule out the presence of HCN, NH${}_3$, and C${}_2$H${}_2$ down to VMRs of 0.001%, 0.0025%, and 0.08% respectively. Our results reduce the parameter space of possible atmospheres consistent with the analysis of HST/WFC3 observations by Tsiaras et al. (2016), and indicate that if 55 Cancri e harbors an atmosphere, it must have a high mean molecular weight and/or clouds.
description: 32 pages, 34 figures. Accepted for publication in AJ
The Nature of Dark Matter
Creators: name: Biermann, Peter L.
name: Munyaneza, Faustin
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Dark matter has been recognized as an essential part of matter for over 70 years now, and many suggestions have been made, what it could be. Most of these ideas have centered on Cold Dark Matter, particles that are expected in extensions of standard particle physics, such as supersymmetry. Here we explore the concept that dark matter is sterile neutrinos, a concept that is commonly referred to as Warm Dark Matter. Such particles have keV masses, and decay over a very long time, much longer than the Hubble time. In their decay they produce X-ray photons which modify the ionization balance in the early universe, increasing the fraction of molecular Hydrogen, and thus help early star formation. Sterile neutrinos may also help to understand the baryon-asymmetry, the pulsar kicks, the early growth of black holes, the minimum mass of dwarf spheroidal galaxies, as well as the shape of dark matter halos. As soon as all these tests have been quantitative in its various parameters, we may focus on the creation mechanism of these particles, and could predict the strength of the sharp X-ray emission line, expected from any large dark matter assembly. A measurement of this X-ray emission line would be definitive proof for the existence of may be called weakly interacting neutrinos, or WINs.
description: 12 pages, To be published in Proceedings of the International School of Astrophysics at Ultra-high Energies, 20-27 June 2006, Erice, Sicily, Italy
Νήψη και σωτηρία στις 50 Πνευματικές Ομιλίες του αγίου Μακαρίου του Αιγυπτίου
Creators: name: Χαμαλίδης, Νικόλαος Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Άγιος Μακάριος Αιγύπτιος
Νήψη
Σωτηρία
Saint Makarios of Egypt
Spiritual vigilance
Salvation

description: Οι 50 Πνευματικές Ομιλίες, οι οποίες είναι γραμμένες υπό την μορφή ερωταποκρίσεων, διακρίνονται για το μεστό και σαφές περιεχόμενο καθώς προσεγγίζουν μέσα στην Ορθόδοξη πνευματικότητα τα υπαρξιακά ερωτήματα του ανθρώπου κάθε εποχής. Κεντρικό θέμα είναι η από τη δημιουργία μέχρι και τα έσχατα πορεία συνάντησης Θεού και ανθρώπου. Όπως στο μυστήριο της δημιουργίας έτσι και στο μυστήριο της Σωτηρίας την πρωτοβουλία την έχει πάντοτε ο Θεός, ο οποίος καλεί συνεχώς το δημιούργημά του να μετάσχει στη Ζωή Του, να γίνει κι αυτός Θεός κατά χάριν. Χωρίς την βίωση της ἐν Χριστῷ ζωής είναι αδύνατη η γνώση των θεανδρικών μυστηρίων του Χριστού. Για αυτή τη γνώση ο άνθρωπος έχει ανάγκη το φωτός του Χριστού, διότι ο Χριστός ήλθε για να φωτίσει και να ντύσει τον άνθρωπο με τα ενδύματα της Θεότητος. Οι Απόστολοι είναι η πιο λαμπρή απόδειξη για αυτό, καθώς με το Χριστό γίνονται οφθαλμοί και φως όλου το κόσμου. Η διδασκαλία του αββά Μακαρίου είναι κατά βάση βιβλική και απορρέει την διδασκαλία ενός αφοσιωμένου τέκνου της Εκκλησίας, το οποίο βασίζεται στην εν Πνεύματι εμπειρία ως το ορθό οδηγό για την απόκτηση-δωρεά των αρετών.
description: The 50 spiritual homilies, which are written in the form of questions and answets, are distinguished for the meaningful and clear content, as they approach within the Orthodox spirituality the existential questions of man in every era. The central theme is course of the encounter between God and man from the creation until the eschaton. Just like in the mystery of creation, in the mystery of Salvation, God has always the initiative, constantly calling upon his creation to participate in His Life and himself to become God by grace. Without the experience of the life in Christ, it is impossible to know the God-man mysteries of Christ. For this knowledge, man needs the light of Christ because Christ came to shine and dress the man with the garments of Godhead. The Apostles are the most brilliant proof of this idea, as with Christ they become eyes and light of the whole world. The teaching of Abba Makarios is basically biblical and derives the teaching of a devoted child of the Church, who is based on Spiritual experience as the right guide to the free acquisition of virtues.
The condensate for two dynamical chirally improved quarks in QCD
Creators: name: Lang, C. B.
name: Majumdar, Pushan
name: Ortner, Wolfgang
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We compare the eigenvalue spectra of the Dirac operator from a simulation with two mass degenerate dynamical chirally improved fermions with Random Matrix Theory. Comparisons with distribution of k-th eigenvalues (k=1,2) in fixed topological sectors (nu=0,1) are carried out using the Kolmogorov-Smirnov test. The eigenvalue distributions are well described by the RMT predictions. The match allows us to read off the quark condensate in the chiral limit directly. Correcting for finite size and renormalization we obtain a mean value of -(276 (11)(16) MeV)**3 in the MS-bar scheme.
description: 8 pages, 2 figures, Final version. To be published
K2-138 g: Spitzer Spots a Sixth Planet for the Citizen Science System
Creators: name: Hardegree-Ullman, Kevin K.
name: Christiansen, Jessie L.
name: Ciardi, David R.
name: Crossfield, Ian J. M.
name: Dressing, Courtney D.
name: Livingston, John H.
name: Volk, Kathryn
name: Agol, Eric
name: Barclay, Thomas
name: Barentsen, Geert
name: Benneke, Björn
name: Gorjian, Varoujan
name: Kristiansen, Martti H.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: $K2$ greatly extended $Kepler$'s ability to find new planets, but it was typically limited to identifying transiting planets with orbital periods below 40 days. While analyzing $K2$ data through the Exoplanet Explorers project, citizen scientists helped discover one super-Earth and four sub-Neptune sized planets in the relatively bright ($V=12.21$, $K=10.3$) K2-138 system, all which orbit near 3:2 mean motion resonances. The $K2$ light curve showed two additional transit events consistent with a sixth planet. Using $Spitzer$ photometry, we validate the sixth planet's orbital period of $41.966\pm0.006$ days and measure a radius of $3.44^{+0.32}_{-0.31}\,R_{\oplus}$, solidifying K2-138 as the $K2$ system with the most currently known planets. There is a sizeable gap between the outer two planets, since the fifth planet in the system, K2-138 f, orbits at 12.76 days. We explore the possibility of additional non-transiting planets in the gap between f and g. Due to the relative brightness of the K2-138 host star, and the near resonance of the inner planets, K2-138 could be a key benchmark system for both radial velocity and transit timing variation mass measurements, and indeed radial velocity masses for the inner four planets have already been obtained. With its five sub-Neptunes and one super-Earth, the K2-138 system provides a unique test bed for comparative atmospheric studies of warm to temperate planets of similar size, dynamical studies of near resonant planets, and models of planet formation and migration.
description: 17 pages, 10 figures, 2 tables, 1 fabulous new planet. Accepted for publication in AJ
Exploring historical and contemporary fragments of nurses’ invisible practice
Creators: name: Macfarlane, Kim
Publisher: name: University of British Columbia
Year: 2008

description: The social context in the hospital setting is fraught with competing and contradictory versions about who nurses are and what they do. Using a sociocultural framework, this thesis provides an analysis of historical and contemporary texts related to hospital-based nursing, and argues that many themes operative in these "official versions" of practice have rendered the breath and complexity of nurses' everyday practices "in/visible." Given that "official versions" of nursing practice are reified in nurses' job descriptions, this research develops a necessarily partial response to the following question: What are nurses' ideas about their in/visible practice within a hospital setting? Nurses’ in/visible practice is, here, defined as the disparity between their "actual" practices, and the job description's "textual representations" of their practice (Smith, 1987 &1990). This investigation took place in an acute care hospital in British Columbia. Seven nurses comprised the primary research group. The research methods used to investigate nurses' in/visible practice included: career autobiographies, direct observation, journals, unstructured one-on-one interviews and concurrent group discussions. Data obtained from these methods underwent qualitative analysis, and both the researcher and the researched (nurses) jointly constructed thematic interpretations of nurses' in/visible practice. This particular analysis of nurses’ in/visible practice suggests that there are "profound" disparities between nurses’ actual practices, and those represented in their job description. Nurses appear to have resisted such textual representations and, in turn, have (re)invented complex theories of "thinking-in-practice," interwoven with an informal "learning with/in practice curriculum."
Current star formation in early-type galaxies and the K+A phenomenon
Creators: name: Helmboldt, J. F.
name: Walterbos, R. A. M.
name: Goto, T.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the results of an effort to identify and study a sample of the likely progenitors of elliptical (E) and lenticular (S0) K+A galaxies. To achieve this, we have searched a sample ~11,000 nearby (m(r)<16) early-type galaxies selected by morphology from the Sloan Digital Sky Survey (SDSS) Main spectroscopic sample for actively star-forming E and S0 galaxies. Using emission line ratios and visual inspection of SDSS g-band images, we have identified 335 galaxies from the SDSS Fourth Data Release (DR4) as actively star-forming E and S0 galaxies. These galaxies make up about 3% of the total early-type sample and less than 1% of all Main galaxies with m(r)<16. We also identified a sample of ~400 K+A galaxies from DR4 with m(r)<16; more than half of these are E and S0 galaxies. We find that star-forming early-type galaxies and K+A galaxies have similar mass distributions; they are on average less massive than typical early-type galaxies but more massive than the average star-forming galaxy. Both of these types of galaxies are found in higher fractions among all galaxies in lower density environments. The fractions of star-forming E and S0 galaxies and E and S0 K+A galaxies depend on environment in nearly the same way. Model spectra fit to the stellar continua of the star-forming E and S0 galaxies showed that their properties are consistent with star formation episodes of <1 Gyr in duration. The modelling results imply that on average, the star formation episodes will increase the stellar masses by about 4%. There is also evidence that the star-forming regions within these galaxies are rotationally supported.
description: Accepted to MNRAS, 19 pages, 14 figures
Remembering the Holocaust in a Racial State: Cultural and Discursive Aspects of Holocaust Memory in South Africa from Apartheid to Democracy (1948-1994)
Creators: name: Mikel Arieli, Roni
Publisher: name: Zenodo
Year: 2019
Subjects: South Africa
Jewish
Holocaust memroy
Apartheid
Multi-directional Memory
Zionism
Anti-Semitism

description: This study explores cultural and discursive performances of Holocaust memory in South Africa from the early years of apartheid through to its transition to democracy (1948-1994). To focus on apartheid-era Jewish commemorations of the destruction of European Jewry is to see the fascinating transformation of a diasporic community, one with a gradually shifting social position. Through the prism of Holocaust memory, this research addresses the ambivalent nature of this community, as a minority within the privileged minority, that shapes the need for specific forms of self-representation. The research’s main argument is that the ambivalent status that designated South African Jews ambivalence position in apartheid South Africa is reflected in the centrality of Holocaust memory to the community’s collective identity, politics and culture. The South African case is a unique example of a struggle against anti-Semitism that is being completely detached from the struggle against racism. Through official national routes, the South African Jewish community was able to publicly mediate the anti-antisemitic message of the Holocaust to the white communities, while ignoring its relevance to local racism. The paradox was reinforced when the community used the draconian apparatus of state systems of a deeply oppressive racial regime to counter anti-Semitism and Holocaust denial that themselves encoded racist assumptions. However, this research moves beyond an insular focus on the South African Jewish community in its consideration of state actors, and in a very different modality, investigates prominent figures in the anti-apartheid struggle not previously considered in this regard. This cross-chronological chapter provides alternative perceptions of the destruction of European Jews during the apartheid years. Drawing on a wide range of primary sources, including speeches and rabbinic sermons, reports of communal organizations, Jewish and non-Jewish press, literature, historiography, memoirs, plays, films, exhibitions, and monuments, this research evidences the urgent, ongoing efforts of organized South African Jews to remember the extermination of European Jews; it also demonstrates clearly the role played by those commemorations in the formation of South African white communities Holocaust consciousness. Through an examination of this rich body of archival materials, the dissertation chapters chronologically and thematically map the centers of gravity of memory and consciousness, highlighting the local dominant modes of commemoration and memorialization of the Holocaust throughout the apartheid period and during the transition to democracy.
Gauge symmetries decrease the number of Dp-brane dimensions
Creators: name: Nikolic, B.
name: Sazdovic, B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: It is known that the presence of antisymmetric background field $B_{μν}$ leads to noncommutativity of Dp-brane manifold. Addition of the linear dilaton field in the form $Φ(x)=Φ_0+a_μx^μ$, causes the appearance of the commutative Dp-brane coordinate $x=a_μx^μ$. In the present article we show that for some particular choices of the background fields, $a^2\equiv G^{μν}a_μa_ν=0$ and $\tilde a^2\equiv [ (G-4BG^{-1}B)^{-1}\ ]^{μν}a_μa_ν=0$, the local gauge symmetries appear in the theory. They turn some Neuman boundary conditions into the Dirichlet ones, and consequently decrease the number of the Dp-brane dimensions.
description: We improve Sec.4. and Conclusion and we added the Appendix in order to clarify results
Tuning the flat bands of the kagome metal CoSn with Fe, In, or Ni doping
Creators: name: Sales, B. C.
name: Meier, W. R.
name: May, A. F.
name: Xing, J.
name: Yan, J. -Q
name: Gao, S.
name: Liu, Y. H.
name: Stone, M. B.
name: Christianson, A. D.
name: Zhang, Q.
name: McGuire, M. A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: CoSn is a Pauli paramagnet with relatively flat d-bands centered about 100 meV below the Fermi energy Ef. Single crystals of CoSn lightly doped with Fe, In, or Ni are investigated using x-ray and neutron scattering, magnetic susceptibility and magnetization, ac susceptibility, specific heat and resistivity measurements. Within the rigid band approximation, hole doping with a few percent of Fe or In should move the flat bands closer to Ef, whereas electron doping with Ni should move the flat bands further away from Ef. We provide evidence that this indeed occurs. Fe and In doping drive CoSn toward magnetism, while Ni doping suppresses CoSn's already weak magnetic response. The resulting ground state is different for Fe versus In doping. For Fe-doped crystals, Co1-xFexSn, with 0.02 < x < 0.27, the magnetic and specific heat data are consistent with the formation of a spin glass, with a glass transition temperature, Tg, ranging from 1 K for x=0.02 to 10 K for x= 0.27. Powder and single crystal neutron diffraction found no evidence of long-range magnetic order below Tg with x = 0.17. For In-doped crystals, CoSn1-yIny, both the magnetic susceptibility and the Sommerfeld coefficient, gamma, increase substantially relative to pure CoSn, but with no clear indication of a magnetic transition for 0.05 < y < 0.2. CoSn crystals doped with Ni (Co0.93Ni0.07Sn) have a significantly smaller magnetic susceptibility and gamma than pure CoSn, consistent with the flat bands further from Ef.
description: 20 pages, 10 figures