cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Long-Term Variations in Solar Differential Rotation and Sunspot Activity, II: Differential Rotation Around the Maxima and Minima of Solar Cycles 12-24
Creators: name: Javaraiah, J.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We analyzed the sunspot-group daily data that were reported by Greenwich Photoheliogrphic Results (GPR) during the period 1874-1976 and Debrecen Photoheliographic Data (DPD) during the period 1977-2017. We determined the equatorial rotation rate [A] and the latitude gradient [B] components of the solar differential rotation by fitting the data in each of the 3-year moving time intervals (3-year MTIs) successively shifted by one year during the period 1874-2017 to the standard law of differential rotation. The values of A and B around the years of maxima and minima of Solar Cycles 12-24 are obtained from the 3-year MTIs series of A and B and studied the long-term cycle-to-cycle modulations in these coefficients. Here we have used the epochs of the maxima and minima of Solar Cycles 12-24 that were recently determined from the revised Version-2 international sunspot-number series. We find that there exits a considerably significant secular decreasing-trend in A around the maxima of solar cycles. There exist no secular trends in both A and B around the minima of solar cycles. The secular trend in B around the maxima of solar cycles is also found to be statistically insignificant. We fitted a cosine function to the values of A, and also to those of B, after removing the corresponding linear trends. The cosine-fits suggest that there exist ~54-year (~94-year) and ~82-year (~79-year) periodicities in A (B) around the maxima and minima of solar cycles, respectively. The amplitude of the cosine-profile of A (B) around the minima of solar cycles is about 41% (65%) larger than that of A (B) around the maxima. In addition, the cosine profiles of A and B suggest a large (up to 180 degree) phase difference between the long-term variations of A, and also between those of B, around maxima and minima of solar cycles.
description: 18 pages, 6 figures, to be published in Solar Physics
Η διαφήμιση στον ελληνικό τύπο (1870-1912)
Creators: name: Χαρμπίδου, Χαρά Πρόδρομου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Διαφήμιση
Τύπος
Ρεκλάμα
Advertising
Press
Advertisement

description: Η μεταπτυχιακή διπλωματική εργασία με τίτλο: Η Διαφήμιση στον Ελληνικό Τύπο (1870 - 1912), εξετάζει την εξέλιξη του φαινομένου της διαφήμισης στον ελληνικό τύπο τόσο ως προς τη μορφή, όσο και ως προς το περιεχόμενο. Πρόκειται για πρωτογενή έρευνα αποδελτίωσης διαφημίσεων από τις ψηφιακές διαθέσιμες πηγές αρχείων των εφημερίδων της εξεταζόμενης περιόδου. Για την ανάλυση του ερευνητικού υλικού αξιοποιήθηκε μεθοδολογικά η ανάλυση διαφημιστικού λόγου από πλευράς κειμενογλωσσολογικής και ρητορικής, ενώ παρατηρείται ειδικότερα ο οπτικοποιημένος λόγος και η σχέση λεκτικού – οπτικού μηνύματος και εικόνας (σύμβολα , συμβολισμοί, κυρίαρχα πρότυπα) με τη βοήθεια της σημειωτικής μεθόδου. Παράλληλα γίνεται κριτική ανάλυση των διαφημίσεων διαφόρων τομέων (σύμφωνα με την ποιοτική τους κατηγοριοποίηση), που ταξινομούνται σε δύο επιμέρους χρονικές περιόδους του εξεταζόμενου χρονικού διαστήματος. Έτσι, επιχειρείται η διαπίστωση συμπερασμάτων ώστε να απαντηθούν τα ερωτήματα σχετικά με την εξέλιξη της διαφήμισης, (ως προς τη μορφή και το περιεχόμενό της), σχετικά με το κοινό στο οποίο απευθύνεται, καθώς και με ποιους τρόπους απευθύνεται σε αυτό. Παράλληλα εξάγονται συμπεράσματα για ειδικότερα θέματα που σχετίζονται με το φαινόμενο της διαφήμισης, όπως είναι η καταναλωτική κουλτούρα, το ταξικό ζήτημα, το ζήτημα του φύλου κλπ.
description: The Master degree thesis entitled: Advertising in the Greek press (1870 - 1912), examines the evolution of the advertising phenomenon in Greek press both in form and in content. This primary research clipping ads from digital newspaper archives available sources of the period. For the analysis of the research material utilized methodological analysis of advertising discourse in terms text linguistics and rhetoric forms, and there especially the visualized speech and word relationship - visual message and image (symbols, notations, mainstream standards) with the help of semiotic method. At the same time becomes critical analysis of advertising various sectors (according to their qualitative classification), which are classified into two sub-periods of the test period. Thus, attempts to finding conclusions to answer the questions about the evolution of advertising, (in form and content) on the target audience, and in what ways is addressed to it. Alongside conclusions are drawn on specific issues related to the phenomenon of advertising, such as consumer culture, the class issue, the issue of gender etc.
Environmental processing of galaxies in HI-rich groups
Creators: name: Džudžar, Robert
name: Kilborn, Virginia
name: Sweet, Sarah M.
name: Meurer, Gerhardt
name: Jarrett, T. H.
name: Kleiner, Dane
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present and explore the resolved atomic hydrogen (HI) content of 13 HI-rich and late-type dominated groups denoted `Choirs'. We quantify the HI content of the Choir galaxies with respect to the median of the HI-mass fraction ($f_{\textrm{HI}}$) of their grandparent HIPASS sample. We find that the HI mass fraction of the Choir galaxies is dispersed around the HIPASS median in the range $-1.4 \leq Δf_{\textrm{HI}}\textrm{[dex]}\leq 0.7$, from HI-excess to HI-deficient galaxy regime. The HI-excess/HI-deficient galaxies contain more/less than 2.5 times their expected HI content with respect to the HIPASS median. We show and discuss that the environmental processing in Choirs occurs via tidal stripping and galaxy mergers. Our analysis suggests that tidal stripping contributes to the loss of the HI, while galaxy mergers contribute to the enhancement of the HI. Exploring the mid-infrared properties of Choir galaxies we find possible environmental processing in only nine Choir galaxies, which indicates that environmental processing is more perceptible in the HI content than the mid-infrared properties. Moreover, we find that environmental processing occurs in Choir groups regardless of their global environment, whether they are in isolation or in proximity to the denser structures, such as cosmic web filaments. We explore possible scenarios of the Choirs evolution, taking into account their HI content, velocity dispersion, crossing time and their global environment. We conclude that the most likely evolution for the majority of Choir groups is that they will become more compact as their members undergo multiple HI-rich mergers.
description: 39 pages, 31 figures and 9 tables, accepted for publication in MNRAS
NLTE determination of the sodium abundance in a homogeneous sample of extremely metal-poor stars
Creators: name: Andrievsky, S. M.
name: Spite, M.
name: Korotin, S. A.
name: Spite, F.
name: Bonifacio, P.
name: Cayrel, R.
name: Hill, V.
name: Francois, P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Abundance ratios in extremely metal-poor (EMP) stars are a good indication of the chemical composition of the gas in the earliest phases of the Galaxy evolution. It had been found from an LTE analysis that at low metallicity, and in contrast with most of the other elements, the scatter of [Na/Fe] versus [Fe/H] was surprisingly large and that, in giants, [Na/Fe] decreased with metallicity. Since it is well known that the formation of sodium lines is very sensitive to non-LTE effects, to firmly establish the behaviour of the sodium abundance in the early Galaxy, we have used high quality observations of a sample of EMP stars obtained with UVES at the VLT, and we have taken into account the non-LTE line formation of sodium. The profiles of the two resonant sodium D lines (only these sodium lines are detectable in the spectra of EMP stars) have been computed in a sample of 54 EMP giants and turn-off stars (33 of them with [Fe/H]< -3.0) with a modified version of the code MULTI, and compared to the observed spectra. With these new determinations in the range -4
description: 8 pages, 9 figures; accepted for publication in A&A
Astropecten irregularis subsp. pentacanthus
Creators: name: Madeira, Patrícia
name: Kroh, Andreas
name: Cordeiro, Ricardo
name: De, António M.
name: Martins, Frias
name: Ávila, Sérgio P.
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Echinodermata
Asteroidea
Paxillosida
Astropectinidae
Astropecten
Astropecten irregularis
Astropecten irregularis pentacanthus (delle chiaje, 1827)

description: Erroneous— Astropecten irregularis pentacanthus (Delle Chiaje, 1827)   Reports for the Azores:
 non Astropecten pentacanthus (Philippi, 1837) — Simroth 1888: 231 [misidentified A. hermatophilus];
 Astropecten irregularis pentacanthus (Delle Chiaje, 1827) — Koehler 1914b: 273, 1924: 196–199 [based on Simroth 1888]; Madsen 1950: 169–170 [based on Ludwig 1897].
 Type locality: Mediterranean Sea.
 See: Tortonese (1965: 132–137).
 Occurrence: Endemic to the Mediterranean Sea (A.M. Clark & Downey 1992); possibly also present in the East Atlantic (Gorringe Seamount and Madeira; Zulliger & Lessios 2010; Pérès 1964); other subspecies of are also known in the Atlantic from Scandinavia to South Africa (A.M. Clark & Downey 1992).
 Depth: shallow water to 929 m, particularly abundant between 50 to 400 m (Tortonese 1965).
 Habitat: soft sediments, on biogenic detritus to sandy silt bottoms, and Zostera and Posidonia prairies (Koukouras et al. 2007).
 Larval stage: planktotrophic (inferred from A. irregularis irregularis, see McEdward & Miner 2001).
 Remarks: Simroth (1888) was responsible for the only record of Astropecten pentacanthus known from the Azores. Later, D̂derlein (1917) re-assigned Simroth material to A. hermatophilus, the only Astropecten species known to occur in the Azores with certainty (see remarks under Astropecten hermatophilus).
description: Published as part of Madeira, Patrícia, Kroh, Andreas, Cordeiro, Ricardo, De, António M., Martins, Frias & Ávila, Sérgio P., 2019, The Echinoderm Fauna of the Azores (NE Atlantic Ocean), pp. 1-231 in Zootaxa 4639 (1) on page 167, DOI: 10.11646/zootaxa.4639.1, http://zenodo.org/record/3342161
Αποτυχημένες απόπειρες ανάκτησης της αραβοκρατούμενης Κρήτης από τους Βυζαντινούς (περ. 824-949)
Creators: name: Σιδηρόπουλος, Δημήτριος Λαζάρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Κρήτη
Άραβες
Βυζάντιο
Crete
Arabs
Byzantium

description: Στόχος της παρούσας διπλωματικής εργασίας είναι η παρουσίαση των αποτυχημένων εκστρατειών που οργάνωσε η Βυζαντινή αυτοκρατορία για την ανάκτηση της αραβοκρατούμενης Κρήτης κατά το χρονικό διάστημα 824-949. Η απώλεια του νησιού στα τέλη του α΄ τετάρτου του 9ου αιώνα αποτέλεσε ένα ορόσημο για την σκληρή σύγκρουση που διεξαγόταν ανάμεσα στους βυζαντινούς και τους αραβικούς στόλους για την κυριαρχία στην ανατολική Μεσόγειο. Η εγκαθίδρυση ενός αραβική εμιράτου από μια ομάδα εξόριστων μουσουλμάνων της Ανδαλουσίας τόσο κοντά στην καρδιά του Αιγαίου δημιούργησε προβλήματα στο εμπόριο, την καθημερινή ζωή, αλλά και την άμυνα της Βυζαντινής αυτοκρατορίας. Οι Βυζαντινοί διέθεσαν σημαντικούς πόρους (ανθρώπινο δυναμικό, πλοία, χρήματα) για να πετύχουν τον στόχο της ανακατάληψης του νησιού, αλλά όλες οι προσπάθειες απέβησαν άκαρπες. Η ανάκτηση του νησιού το 961 από το Νικηφόρο Φωκά κατέστη εφικτή μετά την εμπειρία που είχε ήδη αποκτηθεί από τις προηγούμενες αποτυχημένες εκστρατείες.
description: The objective of this thesis is the presentation of failed campaigns organized by the Byzantine Empire to recover the arab-held island of Crete during the period 824-949 A.D.. The loss of the island at the end of the first quarter of the 9th century was a milestone for the harsh conflict which was carried out between the Byzantine and Arab fleets for the control of the eastern Mediterranean area. The establishment of an Arab emirate by a group of exiled Andalusian Muslims so close to the heart of the Aegean has caused problems in trade, everyday life, but also the defense of the Byzantine Empire. The Byzantines committed considerable resources (manpower, ships, money) to achieve the objective of the recapture of the island, but all efforts were fruitless. The recovery of the island in 961 by Nikiforos Fokas made possible after the experience already gained from previous failed campaigns.
Darboux diagonalization of the spatial 3-metric in Kerr spacetime
Creators: name: Baines, Joshua
name: Berry, Thomas
name: Simpson, Alex
name: Visser, Matt
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The astrophysical importance of the Kerr spacetime cannot be overstated. Of the currently known exact solutions to the Einstein field equations, the Kerr spacetime stands out in terms of its direct applicability to describing astronomical black hole candidates. In counterpoint, purely mathematically, there is an old classical result of differential geometry, due to Darboux, that all 3-manifolds can have their metrics recast into diagonal form. In the case of the Kerr spacetime the Boyer-Lindquist coordinates provide an explicit example of a diagonal spatial 3-metric. Unfortunately, as we demonstrate herein, Darboux diagonalization of the spatial 3-slices of the Kerr spacetime is incompatible with simultaneously putting the Kerr metric into unit-lapse form while retaining manifest axial symmetry. This no-go theorem is somewhat reminiscent of the no-go theorem to the effect that the spatial 3-slices of the Kerr spacetime cannot be chosen to be conformally flat.
description: 18 pages
Υπολογιστική μελέτη της προσρόφησης πρότυπων οργανικών ημιαγωγών σε μεταλλικές επιφάνειες για εφαρμογές των οργανικών ηλεκτρονικών
Creators: name: Σταματέρη, Αλεξάνδρα Θεόδωρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Οργανικά
Ημιαγωγός
Επιφάνειες
Organic
Semiconductor
Surfaces

description: Σκοπός της διπλωματικής εργασίας είναι να αποκαλυφθούν οι μηχανισμοί σε ατομικό επίπεδο της επίδρασης του νερού στις ιδιότητες των μεταλλικών επιφανειών, αλλά και των μηχανισμών που διέπουν τη διεπιφάνεια μεταξύ μεταλλικών επιφανειών και οργανικών ημιαγωγών σε ένα οργανικό φωτοβολταϊκό (OPV) με τη χρήση της Θεωρίας Συναρτησιοειδούς της Πυκνότητας (Density functional theory- DFT). Ως πρώτο βήμα, εξετάστηκε η προσρόφηση του νερού πάνω στις επιφάνειες του αργύρου και του αλουμινίου και τα συστήματα μελετήθηκαν ως προς τη σταθερότητα τους. Επίσης μελετήθηκε η συσχέτιση της προσρόφησης των μορίων νερού με τη μεταβολή του έργου εξόδου των συστημάτων. Ως δεύτερο βήμα, εξετάστηκε η προσρόφηση των πρότυπων οργανικών ημιαγωγών PC60BM και P3HT πάνω στην μεταλλική επιφάνεια του αργύρου. Μελετήθηκε διεξοδικά η σταθερότητα των δομών που εξετάστηκαν, καθώς και το πώς μεταβάλλεται το έργο εξόδου των επιφανειών λόγω της προσρόφησης. Τέλος, μελετήθηκε η επίδραση του ηλεκτροστατικού διπόλου που δημιουργείται στη διεπιφάνεια λόγω προσρόφησης στην απόδοση των OPVs.
description: The aim of the present thesis is to perform first-principles calculations based on density functional theory (DFT), in order to reveal the atomic mechanisms of the adsorption of water on the clean metal surfaces, as well as to study the structural details and probe the electronic properties of a prototype donor-acceptor system in organic photovoltaics (OPVs), upon adsorption on a clean Ag surface. Firstly, we study the stability and work functions of the most exposed stable surfaces of prototype metals related to OPV-devices (i.e. aluminum and silver). We also address effects of water on these surfaces and associate the adsorption with the work function. Furthermore, we identify different stable configurations for the adsorption of PC60BM on Ag surfaces with different orientation of the molecules with respect to the interface and the most stable configuration of P3HT and we investigate the work function modification upon adsorption. As a last step we calculate the charge density difference at the interface due to adsorption, in order to investigate the formed interfacial dipole. These results, help clarify the interaction between prototype OPV materials and the Ag surface and may aid towards the increase of the performance of such materials on OPV devices.
Physical parameters and multiplicity of five southern close eclipsing binaries
Creators: name: Szalai, T.
name: Kiss, L. L.
name: Meszaros, Sz.
name: Vinko, J.
name: Csizmadia, Sz.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Aims: Detect tertiary components of close binaries from spectroscopy and light curve modelling; investigate light-travel time effect and the possibility of magnetic activity cycles; measure mass-ratios for unstudied systems and derive absolute parameters. Methods: We carried out new photometric and spectroscopic observations of five bright (V<10.5 mag) close eclipsing binaries, predominantly in the southern skies. We obtained full Johnson BV light curves, which were modelled with the Wilson-Devinney code. Radial velocities were measured with the cross-correlation method using IAU radial velocity standards as spectral templates. Period changes were studied with the O-C method, utilising published epochs of minimum light (XY Leo) and ASAS photometry (VZ Lib). Results: For three objects (DX Tuc, QY Hya, V870 Ara), absolute parameters have been determined for the first time. We detect spectroscopically the tertiary components in XY Leo, VZ Lib and discover one in QY Hya. For XY Leo we update the light-time effect parameters and detect a secondary periodicity of about 5100 d in the O$-$C diagram that may hint about the existence of short-period magnetic cycles. A combination of recent photometric data shows that the orbital period of the tertiary star in VZ Lib is likely to be over 1500 d. QY Hya is a semi-detached X-ray active binary in a triple system with K and M-type components, while V870 Ara is a contact binary with the third smallest spectroscopic mass-ratio for a W UMa star to date (q=0.082+/-0.030). This small mass-ratio, being close to the theoretical minimum for contact binaries, suggests that V870 Ara has the potential of constraining evolutionary scenarios of binary mergers. The inferred distances to these systems are compatible with the Hipparcos parallaxes.
description: 11 pages, 14 figures, accepted for publication in A&A (02/01/2007)
PHENIX overview
Creators: name: Hachiya, Takashi
Publisher: name: Zenodo
Year: 2024
Subjects: hp24
phenix
p+p
photon
direct photon
longitudinal spin asymmetry
jet
cross section
dilepton
mid-rapidity
dielectron
charm
bottom
charmonium
dca
J/Ψ
drell-yan
open charm
multiplicity
small systems
p+au
d+au
3he+au
π0
raa
nuclear
modification
au+au
thermal photon
scaling
elliptic
flow
heavy flavor
forward-rapidity
backward-rapidity
jet quenching

description: Talk presented at the Hard and Electromagnetic Probes of High-Energy Nuclear Collisions, 2024 conference
Improved Measurement of Double Helicity Asymmetry in Inclusive Midrapidity pi^0 Production for Polarized p+p Collisions at sqrt(s)=200 GeV
Creators: name: PHENIX Collaboration
name: Adler, S. S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present an improved measurement of the double helicity asymmetry for pi^0 production in polarized proton-proton scattering at sqrt(s) = 200 GeV employing the PHENIX detector at the Relativistic Heavy Ion Collider (RHIC). The improvements to our previous measurement come from two main factors: Inclusion of a new data set from the 2004 RHIC run with higher beam polarizations than the earlier run and a recalibration of the beam polarization measurements, which resulted in reduced uncertainties and increased beam polarizations. The results are compared to a Next to Leading Order (NLO) perturbative Quantum Chromodynamics (pQCD) calculation with a range of polarized gluon distributions.
description: 389 authors, 4 pages, 2 tables, 1 figure. Submitted to Phys. Rev. D, Rapid Communications. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html
Investigating the performance of transport infrastructure using real-time data and a scalable multi-modal agent based model
Creators: name: Casey, Gerard
Publisher: name: Apollo - University of Cambridge Repository
Year: 2019
Subjects: transport
city
modelling
distributed
computing
graph
network
carbon
emissions
sustainability

description: The idea that including more information in more dynamic and iterative ways is central to the promise of the big data paradigm. The hope is that via new data sources, such as remote sensors and mobile phones, the reliance on heavily simplified generalised functions for model inputs will be erased. This trade between idealised and actual empirical data will be matched with dynamic models which consider complexity at a fundamental level, inherently mirroring the systems they are attempting to replicate. Cloud computing brings the possibility of doing all of this, in less time than the simplified macro models of the past, thus enabling better answers and at the time of critical decision making junctures. This research was task driven - the question of high speed rail versus aviation led to an investigation into the simplifications and assumptions that back up many of the commonly held beliefs on the sustainability of different modes of transport. The literature ultimately highlighted the need for context specific information; actual load factors, actual journey times considering traffic/engineering works and so on. Thus, rather than being explicitly an exercise in answering a specific question, a specific question was used to drive the development of a tool which may hold promise for answering a range of transportation related questions. The original contributions of this work are, firstly the use of real-time data sources to quantify temporally and spatially dynamic network performance metrics (eg. journey times on different transport models) and secondly to organise these data sources in a framework which can handle the volume and type of the data and organise the data in a way so that it is useful for the dynamic agent based modelling of future scenarios.
description: EPSRC I Case Studentship with Ove Arup & Partners
Theory of Photon-Assisted Magnetoacoustic Resonance as a New Probe of Quadrupole Dynamics
Creators: name: Koga, Mikito
name: Matsumoto, Masashige
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Motivated by the recent progress of phonon-mediated control in quantum spin devices, we propose a possibility of hybrid measurement using electron paramagnetic resonance (EPR) and a surface acoustic wave (SAW). Considering quadrupole-strain (QS) couplings suggested for silicon vacancies, we present a minimum model of the two-level system to investigate a magnetoacoustic resonance (MAR) coupled to various strain modes driven by the SAW. The longitudinal and transverse QS couplings can be changed by rotating a magnetic field, which depends on a combination of the strain modes. Using the Floquet theory, we elucidate each coupling effect on the time-averaged transition probability, especially focus on a single-phonon transition process. The important result is that the longitudinal QS coupling brings about a sharp photon-assisted resonance and leads to an abrupt change in the field-angle dependent transition probability. Since this phonon transition process is always accompanied by the photon transition, the field angle for the sharp resonance peak can be detected by the EPR measurement. The hybrid EPR-MAR measurement is useful to confirm the existence of quadrupole degrees of freedom strongly coupled to elastic strains, and thus it is expected to be a complementary probe for the precise evaluation of quadrupole properties.
description: 10 pages, 12 figures
Calyptraster coa Sladen 1882
Creators: name: Madeira, Patrícia
name: Kroh, Andreas
name: Cordeiro, Ricardo
name: De, António M.
name: Martins, Frias
name: Ávila, Sérgio P.
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Echinodermata
Asteroidea
Velatida
Pterasteridae
Calyptraster
Calyptraster coa

description: Erroneous— Calyptraster coa Sladen, 1882   Reports for the Azores:
 Calyptraster coa Sladen, 1882 — Walenkamp 1979: 64–72, figs. 19, 23–25, pl. 14, figs. 1–4.
 Type locality: Pernambuco, Brazil (09°10’S, 34°50’W).
 See: Sladen (1889: 489–491, pl. 78, figs. 1–2, pl. 79, figs. 1–3); A.M. Clark & Downey (1992: 308–309, figs. 49f, h, pl. 75, figs. A–B).
 Occurrence: Western Atlantic, from the Bahamas and Florida south to Brazil (c. 09°S; Sladen 1889, Walenkamp 1979).
 Depth: 260–993 m (A.M. Clark & Downey 1992).
 Habitat: soft sediment (mud, Sladen 1889).
 Remarks: see remarks under Calyptraster personatus.
description: Published as part of Madeira, Patrícia, Kroh, Andreas, Cordeiro, Ricardo, De, António M., Martins, Frias & Ávila, Sérgio P., 2019, The Echinoderm Fauna of the Azores (NE Atlantic Ocean), pp. 1-231 in Zootaxa 4639 (1) on page 167, DOI: 10.11646/zootaxa.4639.1, http://zenodo.org/record/3342161
Real-Time Shape Estimation of Tensegrity Structures Using Strut Inclination Angles
Creators: name: Bhat, Tufail Ahmad
name: Yoshimitsu, Yuhei
name: Wada, Kazuki
name: Ikemoto, Shuhei
Publisher: name: arXiv
Year: 2025
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Tensegrity structures are becoming widely used in robotics, such as continuously bending soft manipulators and mobile robots to explore unknown and uneven environments dynamically. Estimating their shape, which is the foundation of their state, is essential for establishing control. However, on-board sensor-based shape estimation remains difficult despite its importance, because tensegrity structures lack well-defined joints, which makes it challenging to use conventional angle sensors such as potentiometers or encoders for shape estimation. To our knowledge, no existing work has successfully achieved shape estimation using only onboard sensors such as Inertial Measurement Units (IMUs). This study addresses this issue by proposing a novel approach that uses energy minimization to estimate the shape. We validated our method through experiments on a simple Class 1 tensegrity structure, and the results show that the proposed algorithm can estimate the real-time shape of the structure using onboard sensors, even in the presence of external disturbances.
The regulation of CD44-mediated adhesion to hyaluronan
Creators: name: Chiu, Roland K.
Publisher: name: University of British Columbia
Year: 2009

description: Although the widely distributed cell surface glycoprotein CD44 has been shown to function as a receptor for the glycosaminoglycan hyaluronan (Aruffo et al, 1990; Miyake etal, 1990b), not all CD44 expressing cell lines are able to bind this particular ligand. This observation suggests that the hyaluronan adhesive capacity of the CD44 molecule is not determined simply by its expression on the cell surface. At present, however, the mechanisms regulating CD44 - mediated adhesion to hyaluronan remain largely undefined. Using expression cloning, a cDNA clone designated B6F1.3, was isolated that appears to "activate" the hyaluronan-binding capacity of CD44 upon transfection into the murine fibroblastoid cell line MOP8. The putative regulatory molecule encoded by this clone was found to be the murine interleukin-2 receptor γ chain (mIL-2Rγ; Cao et al., 1993). Mutation within this molecule is the mechanism causing X-linked severe combined immunodeficiency (XSCID) in humans (Noguchi et al., 1993). The human interleukin-2 receptor γ chain (hIL-2Rγ) was originally isolated as a component of functional IL-2 receptor complexes (Takeshita et al., 1992). More recent studies have demonstrated a link between this molecule and the cytokine receptors for IL-4 (Kondo et al., 1993; Russell et al., 1993) and IL-7 (Noguchi ei al., 1993; Kondo et al., 1994). Furthermore, the receptors for the cytokines IL-9 and IL-13 also are suspected to use the IL-2Rγ chain as a functional component. The expression of B6F1.3 was determined by Northern blot analysis. B6F1.3 mRNA was found at high levels on all tested murine hemopoietic cell lines and tissue types with the exception of the bone marrow cells in which little message was observed. Upregulation of CD44 does not seem to be the mechanism by which the "activation" of adhesion occurs as CD44 levels were apparently unaffected upon transfection of B6F1.3. Moreover, a cytoplasmic deletion mutant of B6F1.3 was not able to induce this adhesive event. These findings suggest a functional link between the IL-2 receptor complex and CD44, which may play a role in contributing to the XSCID phenotype in humans. We further demonstrated that stable expression of the mIL-2Rγ in MOP8 cells by retroviral-mediated gene transfer not only enhanced binding of these cells to hyaluronan but also upregulated c-jun expression without affecting cell surface levels of CD44. Transient expression of the human c-jun cDNA in MOP8 cells by a plasmid-based system using pCDM8 (Seed and Aruffo, 1987) also induced adhesion to hyaluronan, again with no alteration of CD44 expression levels. These data suggest a functional link between the proto-oncogene c-jun and the adhesion protein CD44 in the signal transduction pathways regulating cellular adhesion.
Efficient mapping for Anderson impurity problems with matrix product states
Creators: name: Kohn, Lucas
name: Santoro, Giuseppe E.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose an efficient algorithm to numerically solve Anderson impurity problems using matrix product states. By introducing a modified chain mapping we obtain significantly lower entanglement, as compared to all previous attempts, while keeping the short-range nature of the couplings. Our approach naturally extends to finite temperatures, with applications to dynamical mean field theory, non-equilibrium dynamics and quantum transport.
description: (6+8) pages, (4+9) figures
Initial Reports of the Deep Sea Drilling Project - Volume 74
Creators: name: Moore, T.C., Jr.
name: Rabinowitz, P.D.
name: The Leg 74 Science Party
Publisher: name: U.S. Government Printing Office
Year: 1984
Subjects: Deep Sea Drilling Project
Glomar Challenger
DSDP
Leg 74
Site 525
Site 526
Site 527
Site 528
Site 529
Southeastern Atlantic Ocean
Walvis Ridge
Angola Basin

description: This volume covers Leg 74 of the cruises of the Drilling Vessel Glomar Challenger. The drilling plan for Leg 74 of the Deep Sea Drilling Project was designed to address three main scientific topics: (1) the history of the deep-water circulation in the southeastern Atlantic, (2) the nature and geologic evolution of the Walvis Ridge, and (3) the biostratigraphy and magnetic stratigraphy of this region. To study these subjects, a suite of five sites was drilled on the Walvis Ridge that extended from its crest (near 1000 m water depth) down its northwest flank into the Angola Basin to a depth of 4400 m. The Glomar Challenger left Cape Town, South Africa in June 1980 and arrived at Walvis Bay, South Africa in July 1980.
Body-assisted van der Waals interaction between two atoms
Creators: name: Safari, Hassan
name: Buhmann, Stefan Yoshi
name: Welsch, Dirk-Gunnar
name: Dung, Ho Trung
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Using fourth-order perturbation theory, a general formula for the van der Waals potential of two neutral, unpolarized, ground-state atoms in the presence of an arbitrary arrangement of dispersing and absorbing magnetodielectric bodies is derived. The theory is applied to two atoms in bulk material and in front of a planar multilayer system, with special emphasis on the cases of a perfectly reflecting plate and a semi-infinite half space. It is demonstrated that the enhancement and reduction of the two-atom interaction due to the presence of a perfectly reflecting plate can be understood, at least in the nonretarded limit, by using the method of image charges. For the semi-infinite half space, both analytical and numerical results are presented.
description: 17 pages, 9 figures
Alkali-metal-induced Fermi level and two dimensional electrons at cleaved InAs(110) surfaces
Creators: name: Minowa, Masaaki
name: Masutomi, Ryuichi
name: Mochizuki, Toshimitsu
name: Okamoto, Tohru
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Low-temperature Hall measurements have been performed on two-dimensional electron gases (2DEGs) induced by deposition of Cs or Na on in situ cleaved surfaces of p-type InAs. The surface donor level, at which the Fermi energy of the 2DEG is pinned, is calculated from the observed saturation surface electron density using a surface potential determined self-consistently. The results are compared to those of previous photoelectron spectroscopy measurements.
description: 3 pages, 4 figures
What is there in the black box of dark energy: variable cosmological parameters or multiple (interacting) components?
Creators: name: Grande, Javier
name: Sola, Joan
name: Stefancic, Hrvoje
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The coincidence problems and other dynamical features of dark energy are studied in cosmological models with variable cosmological parameters and in models with the composite dark energy. It is found that many of the problems usually considered to be cosmological coincidences can be explained or significantly alleviated in the aforementioned models.
description: 6 pages, 1 figure, talk given at IRGAC2006 (Barcelona, July 11-15, 2006), to appear in J. Phys. A
Stellar Population Inference with Prospector
Creators: name: Johnson, Benjamin D.
name: Leja, Joel
name: Conroy, Charlie
name: Speagle, Joshua S.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Inference of the physical properties of stellar populations from observed photometry and spectroscopy is a key goal in the study of galaxy evolution. In recent years the quality and quantity of the available data has increased, and there have been corresponding efforts to increase the realism of the stellar population models used to interpret these observations. Describing the observed galaxy spectral energy distributions in detail now requires physical models with a large number of highly correlated parameters. These models do not fit easily on grids and necessitate a full exploration of the available parameter space. We present prospector, a flexible code for inferring stellar population parameters from photometry and spectroscopy spanning UV through IR wavelengths. This code is based on forward modeling the data and Monte Carlo sampling the posterior parameter distribution, enabling complex models and exploration of moderate dimensional parameter spaces. We describe the key ingredients of the code and discuss the general philosophy driving the design of these ingredients. We demonstrate some capabilities of the code on several datasets, including mock and real data.
description: Submitted to AASJournals. 27 pages, 5 appendices, and 8 figures including one interactive figure viewable in Adobe Reader or at https://prospect.readthedocs.io/en/latest/demo.html . Prospector is available at https://github.com/bd-j/prospector . Monte Carlo samples as well as code to perform the fits and produce the figures are available in a github repo at https://github.com/bd-j/exspect
Παρασκευή και Χαρακτηρισμός Πολυμερικών Ικριωμάτων για Μεταφορά Φαρμάκων
Creators: name: Παππά, Αννα-Μαρία Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Ικριώματα
Νανοσωματίδια
Μεταφορά Φαρμάκων
Scaffolds
Nanoparticles
Drug Delivery

description: Σκοπός της διατριβής ήταν η παρασκευή και μελέτη σύνθετων πολυμερικών νανο-ινωδών ικριωμάτων από πολυκαπρολακτόνη (Polycaprolactone-PCL) με τη τεχνική της ηλεκτροστατικής ινοποίησης, τα οποία φέρουν αντιφλεγμονώδες φάρμακο στο εσωτερικό τους και η εμβάπτιση σε αυτών, βιοαποικοδομήσιμων νανοσωματιδίων πολυ (γαλακτικού-γλυκολικού οξέος) (PLGA) που επίσης φέρουν φάρμακο. Μελετήθηκαν τα παραπάνω σύνθετα νανοσυστήματα ως προς τη μορφολογία, την επιφανειακή χημεία, τις μηχανικές ιδιότητες ενώ παράλληλα εξετάστηκε η επίδραση της επιφανειακής επεξεργασίας τους με χρήση πλάσματος οξυγόνου προκειμένου να καταστούν πιο βιο-συμβατά. Πιο συγκεκριμένα, μελετήθηκε η κυτταρική προσκόλληση και ανάπτυξη σε αυτά, έγιναν μελέτες της απελευθέρωσης του φαρμάκου σε κάθε σύστημα και εξήχθη σε κάθε περίπτωση ο μηχανισμός της απελευθέρωσης μέσω της χρήσης κατάλληλων κινητικών μοντέλων. Από τη μελέτη των δομών που κατασκευάστηκαν, προέκυψε ότι τα προτεινόμενα συστήματα αποτελούν μία πολλά υποσχόμενη πολυλειτουργική πλατφόρμα που μπορεί να εξυπηρετεί ως υπόστρωμα για ιστική αναγέννηση ενώ παράλληλα να εξυπηρετεί τη μεταφορά φαρμακευτικών ουσιών. Μία πιθανή πολλά υποσχόμενη εφαρμογή των παραπάνω συστημάτων είναι ως επικαλύψεις σε καρδιαγγειακά εμφυτεύματα.
description: The aim of the present thesis was the fabrication and characterization of polymeric nanofiber-based scaffolds of polycaprolactone, loaded with an anti-inflammatory drug, via electrospinning as well as the incorporation of cationic-coated drug-loaded poly (lactic-co-glycolic acid) (PLGA) nanoparticles in the matrix. To enhance the cytocompatibility of the nanocomposites, plasma treatment was applied and its effect was finally evaluated by MTT assay in line with imaging studies as compared to controls and drug-free PCL nanofibers. The composite systems were characterized according to their morphology, surface chemistry, mechanical properties and drug release profile. The plasma treated scaffolds, exhibited a more sustained drug release profile, compared to the untreated ones as well as the NPs alone. Moreover, all the scaffolds were found cytocompatible, with the plasma treated ones exhibiting an enhanced cell uptake and adhesion without altering cell viability. Lastly, depth-sensing nanoindentation test showed the enhanced resistance of the plasma treated scaffolds to the plastic deformation. All the above findings, demonstrate the great potential of these multifunctional scaffolds as efficient coatings for stents. To conclude, according to the findings of the present thesis, all the abovementioned fabricated composite multifunctional systems offer a suitable biomimicking environment to promote cell activities and to produce therapeutic effect paving the way for their usage as efficient coatings for biomedical implants such as the drug-eluting-stents.
$X(3872) \to D \bar D γ$ decays and the structure of X(3872)
Creators: name: Colangelo, P.
name: De Fazio, F.
name: Nicotri, S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: It has been suggested that the radiative $X \to D \bar D γ$ decay modes are useful to shed light on the structure of the meson X(3872), since the ratio $ R={Γ(X \to D^+ D^- γ) \over Γ(X \to D^0 \bar D^0 γ)}$ is expected to be small ($R \ll 1$) if $X$ is a molecular $D^{*0} \bar D^0$ state. We compute $R$ in a $\bar c c$ $J^{PC}=1^{++}$ description of $X$ finding that it is tiny in a wide range of hadronic parameters governing the decay. A discrimination between the molecular and $\bar c c$ description can be obtained through the analysis of the photon spectrum.
description: LaTex, 12 pages, 5 figures, version accepted for publication in PLB
Ctenodiscus crispatus
Creators: name: Madeira, Patrícia
name: Kroh, Andreas
name: Cordeiro, Ricardo
name: De, António M.
name: Martins, Frias
name: Ávila, Sérgio P.
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Echinodermata
Asteroidea
Paxillosida
Ctenodiscidae
Ctenodiscus
Ctenodiscus crispatus

description: Erroneous— Ctenodiscus crispatus (Bruzelius, 1805)   Reports for the Azores:
 Ctenodiscus crispatus (Bruzelius, 1805) — García-Diez et al. 2005: 47; Micael & Costa 2010: 322; Micael et al. 2012: 5.
 Type locality: ?Lund.
 See: A.M. Clark & Downey (1992: 109–110, figs. 20a–b, d, pl. 28A–C).
 Occurrence: circumpolar Arctic, in the western Atlantic south in the cold current below the Gulf Stream to Cape Hatteras (though rare south of Cape Cod, Massachusetts) and in the east to Trondheim (Norway) and the cold area of the Faeroe Channel (A.M. Clark & Downey 1992).
 Depth: 10– 1,890 m (A.M. Clark & Downey 1992).
 Habitat: deposit-feeder on soft sediments (mud, sand to clay; Shick et al. 1981, A.M. Clark & Downey 1992).
 Larval stage: direct development (Shick et al. 1981).
 Remarks: the report for the Azores is based on the assumption that the ‘ Asterias polaris Gray’ identified by Perrier (1896a) among the material collected by Hirondelle in the Azores is a synonym of Ctenodiscus crispatus. Analysing the related bibliography, we disagree and thus consider the record of C. crispatus from the archipelago as erroneous (see remarks under Asterias rubens and Leptasterias polaris).
description: Published as part of Madeira, Patrícia, Kroh, Andreas, Cordeiro, Ricardo, De, António M., Martins, Frias & Ávila, Sérgio P., 2019, The Echinoderm Fauna of the Azores (NE Atlantic Ocean), pp. 1-231 in Zootaxa 4639 (1) on pages 167-168, DOI: 10.11646/zootaxa.4639.1, http://zenodo.org/record/3342161
The dynamical state of Abell 2399: a bullet-like cluster
Creators: name: Lourenço, Ana C. C.
name: Lopes, P. A. A.
name: Laganá, T. F.
name: Nascimento, R. S.
name: Machado, R. E. G.
name: Moura, M. T.
name: Jaffé, Y. L.
name: Ribeiro, A. L.
name: Vulcani, B.
name: Moretti, A.
name: Riguccini, L. A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: While there are many ways to identify substructures in galaxy clusters using different wavelengths, each technique has its own caveat. In this paper, we conduct a detailed substructure search and dynamical state characterisation of Abell 2399, a galaxy cluster in the local Universe ($z \sim 0.0579$), by performing a multi-wavelength analysis and testing the results through hydro-dynamical simulations. In particular, we apply a Gaussian Mixture Model to the spectroscopic data from SDSS, WINGS, and Omega WINGS Surveys to identify substructures. We further use public \textit{XMM-Newton} data to investigate the intracluster medium (ICM) thermal properties, creating temperature, metallicity, entropy, and pressure maps. Finally, we run hydro-dynamical simulations to constrain the merger stage of this system. The ICM is very asymmetrical and has regions of temperature and pressure enhancement that evidence a recent merging process. The optical substructure analysis retrieves the two main X-ray concentrations. The temperature, entropy, and pressure are smaller in the secondary clump than in the main clump. On the other hand, its metallicity is considerably higher. This result can be explained by the scenario found by the hydro-dynamical simulations where the secondary clump passed very near to the centre of the main cluster possibly causing the galaxies of that region to release more metals through the increase of ram-pressure stripping.16
description: 16 pages, 11 figures. Accepted in MNRAS
Detection of optical linear polarization in the SN2006aj/XRF060218 non-spherical expansion
Creators: name: Gorosabel, J.
name: Larionov, V.
name: Castro-Tirado, A. J.
name: Guziy, S.
name: Larionova, L.
name: Del Olmo, A.
name: Martinez, M. A.
name: Cepa, J.
name: Cedres, B.
name: Postigo, A. de Ugarte
name: Jelinek, M.
name: Bogdanov, O.
name: LLorente, A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have performed optical polarimetric observations of the SN2006aj associated to the X-ray flash (XRF) of February 18, 2006, XRF060218 that provide information on its expansion geometry. The data were acquired in the R-band with the 0.7m telescope of Crimea, 2.5m Nordic Optical Telescope and the 2.2m of Calar Alto. We report the detection of linear polarization between 3 and 39 days after the gamma-ray event (t-t_0). This represents the first polarization detection of a Ic supernova (SN) associated to an XRF. Our data exhibit a degree of linear polarization (P) around P~4% at t-t_0 ~ 3-5 days, followed by a constant polarization phase with P~1.4% at 13.7 < t-t_0 < 39 days. Our data suggest a decay in P, and more interestingly, show a position angle (θ) rotation of ~100 degrees comparing data taken before and after the R-band lightcurve peak. The reported polarization measurements can be explained by the evolution of an asymmetric SN expansion. We discuss on several ingredients that could account for the observed θrotation.
description: Submitted to A&A. Revised version, comments of the referee included. 4 pages, 3 figures
Dytaster semispinosus
Creators: name: Madeira, Patrícia
name: Kroh, Andreas
name: Cordeiro, Ricardo
name: De, António M.
name: Martins, Frias
name: Ávila, Sérgio P.
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Echinodermata
Asteroidea
Paxillosida
Astropectinidae
Dytaster
Dytaster semispinosus

description: Erroneous— Dytaster semispinosus (Perrier, 1894)   Reports for the Azores:
 Dytaster semispinosus (Perrier, 1894) —A.M. Clark & Downey 1992: 55; Dilman 2014: 26.
 Type locality: off Galicia (44°29’00”N, 13°31’46”W).
 See: A.M. Clark & Downey (1992).
 Occurrence: known only from abyssal waters between the Azores and the Bay of Biscay (Perrier 1894, Koehler 1909).
 Depth: 4,275 –5,005 m (Perrier 1894, Koehler 1909).
 Habitat: soft sediments (Koehler 1909).
 Remarks: A.M. Clark & Downey (1992) placed Dytaster semispinosus within the Azorean waters, though this species was never collected in the archipelago, but between the Azores and the European continental shores by Talisman (Perrier 1894, as Crenaster semispinosus) and by Princesse Alice (Koehler 1909, as Dytaster parvulus).
description: Published as part of Madeira, Patrícia, Kroh, Andreas, Cordeiro, Ricardo, De, António M., Martins, Frias & Ávila, Sérgio P., 2019, The Echinoderm Fauna of the Azores (NE Atlantic Ocean), pp. 1-231 in Zootaxa 4639 (1) on page 168, DOI: 10.11646/zootaxa.4639.1, http://zenodo.org/record/3342161
Transversal laser excitation of atoms in a waveguide
Creators: name: Lizuain, I.
name: Ruschhaupt, A.
name: Muga, J. G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the effect of a laser shining perpendicularly to a waveguide channeling two-level atoms. For weak transversal coupling the excitation of transverse atomic levels occurs at avoided crossings associated with "Rabi resonances" in which the Rabi frequency coincides with the transition frequency between the transverse levels.
description: 10 pages, 10 figures