cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Simulation analysis of the Compton-to-peak method for quantifying radiocesium deposition quantities
Creators: name: Malins, Alex
name: Ochi, Kotaro
name: Machida, Masahiko
name: Sanada, Yukihisa
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Applied Physics (physics.app-ph)
subject: Medical Physics (physics.med-ph)
subject: FOS: Physical sciences

description: Compton-to-peak analysis is a method for selecting coefficients for converting count rates measured with in situ gamma ray spectrometry to radioactivity concentrations of $^{134}$Cs and $^{137}$Cs in the environment. Compton-to-peak analysis is based on the count rate ratio between the spectral regions containing scattered gamma rays to the primary $^{134}$Cs and $^{137}$Cs photopeaks (known as the Compton-to-peak ratio - RCP). RCP changes with the vertical distribution of $^{134}$Cs and $^{137}$Cs within the ground. Inferring this distribution enables the selection of appropriate count rate to activity concentration conversion coefficients. Here PHITS was used to simulate the dependency of RCP on different vertical distributions of $^{134}$Cs and $^{137}$Cs within the ground. A model was created of a LaBr$_3$(Ce) detector used in drone helicopter aerial surveys in Fukushima Prefecture. The model was verified by comparing simulated gamma ray spectra to measurements from test sources. Simulations were performed for the infinite half-space geometry to calculate the dependency of RCP on the mass depth distribution (exponential or uniform) of $^{134}$Cs and $^{137}$Cs within the ground, and on the altitude of the detector above the ground. The calculations suggest that the sensitivity of the Compton-to-peak method is greatest for the initial period following nuclear fallout when $^{134}$Cs and $^{137}$Cs are located close to the ground surface, and for aerial surveys conducted at low altitudes. This is because the relative differences calculated between RCP with respect to changes in the mass depth distribution were largest for these two cases. Data on the measurement height above and on the $^{134}$Cs to $^{137}$Cs activity ratio is necessary for applying the Compton-to-peak method to determine the distribution and radioactivity concentration of $^{134}$Cs and $^{137}$Cs within the ground.
description: 8 pages, 4 figures, Author Accepted Manuscript for the Proceedings of SNA+MC 2020, pp 147-154
Cahiers Mérimée. 2015, n° 7
Creators: name: (:Unap)
Publisher: name: Classiques Garnier
Year: 2015
Subjects: subject: Littérature française
subject: Littérature anglaise
subject: Romantisme frénétique
subject: Roman historique
subject: Catalogues de libraires
subject: Archéologie
subject: Histoire de l'art
subject: Opéra
subject: Cinéma

description: Liste des contributeurs : Olivier Bara, Alexandre Bonafos, Xavier Bourdenet, Jean Canavaggio, Bénédicte Coste, Barbara Dimopoulou, Antonia Fonyi, Sidonie Lemeux-Fraitot, Michel Mervaud, Emilie Pezard, Esther Pinon, Thierry Santurenne, Eric Vuillard
Magnetic order and fluctuations in quasi-two-dimensional planar magnet Sr(Co$_{1-x}$Ni$_x$)$_2$As$_2$
Creators: name: Xie, Yaofeng
name: Li, Yu
name: Yin, Zhiping
name: Zhang, Rui
name: Wang, Weiyi
name: Stone, Matthew B.
name: Cao, Huibo
name: Abernathy, D. L.
name: Harriger, Leland
name: Young, David P.
name: DiTusa, J. F.
name: Dai, Pengcheng
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We use neutron scattering to investigate spin excitations in Sr(Co$_{1-x}$Ni$_{x})_2$As$_2$, which has a $c$-axis incommensurate helical structure of the two-dimensional (2D) in-plane ferromagnetic (FM) ordered layers for $0.013\leq x \leq 0.25$. By comparing the wave vector and energy dependent spin excitations in helical ordered Sr(Co$_{0.9}$Ni$_{0.1}$)$_2$As$_2$ and paramagnetic SrCo$_2$As$_2$, we find that Ni-doping, while increasing lattice disorder in Sr(Co$_{1-x}$Ni$_{x})_2$As$_2$, enhances quasi-2D FM spin fluctuations. However, our band structure calculations within the combined density functional theory and dynamic mean field theory (DFT+DMFT) failed to generate a correct incommensurate wave vector for the observed helical order from nested Fermi surfaces. Since transport measurements reveal increased in-plane and $c$-axis electrical resistivity with increasing Ni-doping and associated lattice disorder, we conclude that the helical magnetic order in Sr(Co$_{1-x}$Ni$_{x})_2$As$_2$ may arise from a quantum order-by-disorder mechanism through the itinerant electron mediated Ruderman-Kittel-Kasuya-Yosida (RKKY) interactions.
Cluster structures for 2-Calabi-Yau categories and unipotent groups
Creators: name: Buan, Aslak Bakke
name: Iyama, Osamu
name: Reiten, Idun
name: Scott, Jeanne
Publisher: name: arXiv
Year: 2007
Subjects: subject: Representation Theory (math.RT)
subject: FOS: Mathematics

description: We investigate cluster tilting objects (and subcategories) in triangulated 2-Calabi-Yau categories and related categories. In particular we construct a new class of such categories related to preprojective algebras of non Dynkin quivers associated with elements in the Coxeter group. This class of 2-Calabi-Yau categories contains the cluster categories and the stable categories of preprojective algebras of Dynkin graphs as special cases. For these 2-Calabi-Yau categories we construct cluster tilting objects associated with each reduced expression. The associated quiver is described in terms of the reduced expression. Motivated by the theory of cluster algebras, we formulate the notions of (weak) cluster structure and substructure, and give several illustrations of these concepts. We give applications to cluster algebras and subcluster algebras related to unipotent groups, both in the Dynkin and non Dynkin case.
description: 49 pages. For the third version the presentation is revised, especially Chapter III replaces the old Chapter III and IV
Single mothers’ experience of community college education : a critical incidents study
Creators: name: Belter, Wendy Lynne
Publisher: name: University of British Columbia
Year: 2009

description: Single-mother families represent a large and growing segment of the population and are the poorest of all family types. There is a demonstrated link between educational attainment and employment and income, yet single mothers are also, as a group, the lowest-educated of all family heads. Little published research exists on the needs and issues of single-mother students. The purpose of this descriptive and exploratory study was to discover and categorize the types of incidents that facilitate and hinder single mother students in their progress through a two-year college program. Ten single-mother students were interviewed using the critical incidents technique. Two-hundred-and-fifty two incidents were identified and categorized into three major and nine minor categories. The first major category was Intrapersonal, containing two minor categories, Coping Strategies and Academic Issues. Interpersonal, the next major category, subsumed five minor categories: Instructors; Children; Friends and Family Members; Other Students and Ex-Husbands. The third major category, Situational, contained two minor categories, College Administration and Policies and Government Services and Programs. Tentative implications for future research, counselling practice and social policy are discussed.
Revised Primordial Helium Abundance Based on New Atomic Data
Creators: name: Peimbert, M.
name: Luridiana, V.
name: Peimbert, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have derived a primordial helium abundance of Yp = 0.2477 +- 0.0029, based on new atomic physics computations of the recombination coefficients of He I and of the collisional excitation of the H I Balmer lines together with observations and photoionization models of metal-poor extragalactic H II regions. The new atomic data increase our previous determination of Yp by 0.0086, a very significant amount. By combining our Yp result with the predictions made by the standard Big Bang nucleosynthesis model, we find a baryon-to-photon ratio, η, in excellent agreement both with the ηvalue derived by the primordial deuterium abundance value observed in damped Lyman-αsystems and with the one obtained from the WMAP observations.
description: 35 pages, 1 figure. AAS LaTeX. Accepted for publication in the Astrophysical Journal. The accepted version is more explicit in the description of the procedure and in the treatment of errors with respect to the first version, and the final numerical result is slightly changed. Scheduled for ApJ, Vol. 667, Sept 20, 2007
Stochastic and quasi-adiabatic electron heating in quasi-parallel shocks
Creators: name: Stasiewicz, Krzysztof
name: Eliasson, Bengt
Publisher: name: arXiv
Year: 2020
Subjects: subject: Space Physics (physics.space-ph)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Using Magnetospheric Multiscale (MMS) observations at the Earth's quasi-parallel bow shock we demonstrate that electrons are heated by two different mechanisms: a quasi-adiabatic heating process during magnetic field compression, characterized by the isotropic temperature relation $T/B=(T_0/B_0)(B_0/B)^α$ with $α=2/3$ when the electron heating function $|χ_e|<1$, and a stochastic heating process when $|χ_e|>1$. Both processes are controlled by the value of the stochastic heating function $χ_j = m_j q_j^{-1} B^{-2}\mathrm{div}(\mathbf{E}_\perp)$ for particles with mass $m_j$ and charge $q_j$ in the electric and magnetic fields $\mathbf{E}$ and $\mathbf{B}$. Test particle simulations are used to show that the stochastic electron heating and acceleration in the studied shock is accomplished by waves at frequencies (0.4 - 5) $f_{ce}$ (electron gyrofrequency) for bulk heating, and waves $f>5\,f_{ce}$ for acceleration of the tail of the distribution function. Stochastic heating can give rise to flat-top electron distribution functions, frequently observed near shocks. It is also shown that obliquely polarized electric fields of electron cyclotron drift (ECD) and ion acoustic instabilities scatter the electrons into the parallel direction and keep the isotropy of the electron distribution. The results reported in this paper may be relevant to electron heating and acceleration at interplanetary shocks and other astrophysical shocks.
description: 12 pages, accepted for publication in The Astrophysical Journal. arXiv admin note: text overlap with arXiv:2009.05644
First detection of variable radio emission originating from the infant planetary system V1298 Tau
Creators: name: Damasso, M.
name: Morata, O.
name: Kaur, S.
name: Viganò, D.
name: Melis, A.
name: Murgia, M.
name: Pilia, M.
name: Lanza, A. F.
name: Del Sordo, F.
name: Antonietti, N.
name: Kansabanik, D.
name: Molinari, E.
name: Peréz-Torres, M.
name: Sánchez-Monge, A.
name: Maggio, A.
name: Girart, J. M.
Publisher: name: arXiv
Year: 2025
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: V1298 Tau is a very young and magnetically active star which hosts a benchmark multi-planetary system to study planet formation and evolutionary history at the earliest stages. We selected V1298 Tau for a first targeted follow-up at radio frequencies with the Karl G. Jansky Very Large Telescope (JVLA), the upgraded Giant Metrewave Radio Telescope (uGMRT), and the Sardinia Radio Telescope (SRT), to search for emission in the overall frequency range 0.55-7.2 GHz. Detecting radio emission from such a very active star is key to characterise its magnetosphere, allowing in principle to probe the strength of the coronal magnetic field and plasma density. Observations were carried out between Oct 2023 and Sept 2024: three epochs with uGMRT band-4 (0.55-0.75 GHz), 12 epochs with the JVLA using L (1-2 GHz) and C (4.5-6.5 GHz) bands, and three epochs with SRT using C-high band (6-7.2 GHz). We report the first detection of radio emission from V1298 Tau at different epochs using the JVLA. The emission has maximum peak flux densities of 91$\pm$10 and 177$\pm$6 $μ$Jy/beam in the L- and C-band, respectively. From a comparison with contemporary optical photometry, we found that the detected emission with the highest fluxes are located around a phase of minimum of the photospheric light curve. Although the uGMRT and SRT observations could not detect the source, we measured 3$σ$ flux density upper limits in the range ~41-56 $μ$Jy/beam using uGMRT, while with SRT we reached upper limits down to 13 mJy. The lack of a significant fraction of circular polarisation indicates that the observed flux is not due to electron cyclotron maser emission from star-planet interaction, and it is likely produced by gyrosynchroton/cyclotron emission from the corona triggered by stellar magnetic activity, although we cannot exclude thermal emission due to a lack of constraints on the brightness temperature.
description: 8 pages, accepted for publication on A&A. Abstract slightly abridged for length constraints
Εγκλήματα κατά της Θρησκείας στην κλασική Αθήνα (και μέχρι τον 3ο αιώνα π.χ.):
Creators: name: Καραθανάση, Βασιλική Χρήστου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Θρησκεία
Αθήνα
Έγκλημα
Religion
Athens
Crime

description: Σκοπός της παρούσας διπλωματικής εργασίας ήταν η καταγραφή και η ταξινόμηση των εγκλημάτων που προσέβαλαν το έννομο αγαθό της θρησκείας στην κλασική Αθήνα και μέχρι τον 3ο αιώνα π.Χ.. Η παρούσα εκκινεί από εισαγωγικές παρατηρήσεις σχετικά με τους θεσμούς και το δόγμα πίστεως των αρχαίων ελλήνων, τα χαρακτηριστικά στοιχεία της θρησκείας τους, καθώς και η αλληλεπίδραση θρησκείας και δικαίου. Στη συνέχεια αναλύονται τα επιμέρους εγκλήματα κατά της θρησκείας, ήτοι το αδίκημα της ασεβείας, για περιπτώσεις του οποίου γίνεται ειδική αναφορά που βασίζεται σε πηγές, η αθεΐα, το αδίκημα της ιεροσυλίας, η κατάχρηση ιερών χρημάτων και η κοπή ιερών δέντρων. Ακόμη, γίνεται εκτενής αναφορά στα δικονομικά ζητήματα και στις ποινές που επιβάλλονταν.
description: The aim of this present thesis was the chronicle of the record and the classification of the crimes against religion in classical Athens until the 3rd century b.C.. The present thesis begins with introductory data about the institutes and the doctrine of the ancient Greeks, the lineaments of their religion, as well as the interaction between religion and the law. Furthermore, there is an analysis of the crimes against religion, namely asebeia, godlessness, conversion of religious funds and destroy of the sacred trees. There is also comprehensive mention of the juridicial matters and the imposed penalties.
Quasiequilibrium black hole-neutron star binaries in general relativity
Creators: name: Taniguchi, Keisuke
name: Baumgarte, Thomas W.
name: Faber, Joshua A.
name: Shapiro, Stuart L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We construct quasiequilibrium sequences of black hole-neutron star binaries in general relativity. We solve Einstein's constraint equations in the conformal thin-sandwich formalism, subject to black hole boundary conditions imposed on the surface of an excised sphere, together with the relativistic equations of hydrostatic equilibrium. In contrast to our previous calculations we adopt a flat spatial background geometry and do not assume extreme mass ratios. We adopt a Gamma=2 polytropic equation of state and focus on irrotational neutron star configurations as well as approximately nonspinning black holes. We present numerical results for ratios of the black hole's irreducible mass to the neutron star's ADM mass in isolation of M_{irr}^{BH}/M_{ADM,0}^{NS} = 1, 2, 3, 5, and 10. We consider neutron stars of baryon rest mass M_B^{NS}/M_B^{max} = 83% and 56%, where M_B^{max} is the maximum allowed rest mass of a spherical star in isolation for our equation of state. For these sequences, we locate the onset of tidal disruption and, in cases with sufficiently large mass ratios and neutron star compactions, the innermost stable circular orbit. We compare with previous results for black hole-neutron star binaries and find excellent agreement with third-order post-Newtonian results, especially for large binary separations. We also use our results to estimate the energy spectrum of the outgoing gravitational radiation emitted during the inspiral phase for these binaries.
description: 17 pages, 15 figures, published in Phys. Rev. D
Determining the Nature of Dark Matter with Astrometry
Creators: name: Strigari, Louis E.
name: Bullock, James S.
name: Kaplinghat, Manoj
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We show that measurements of stellar proper motions in dwarf spheroidal galaxies provide a powerful probe of the nature of dark matter. Allowing for general dark matter density profiles and stellar velocity anisotropy profiles, we show that the log-slope of the dark matter profile at about twice the stellar core (King) radius can be measured to within \pm 0.2 when the proper motions of 200 stars are added to standard line-of-sight velocity dispersion data. This measurement of the log-slope provides a test of Cold and Warm Dark Matter theories at a sensitivity not possible with line-of-sight velocity dispersion measurements alone. The upcoming SIM PlanetQuest will have the sensitivity to obtain the required number of proper motions in Milky Way dwarf spheroidal galaxies.
description: Accepted for publication in ApJL
Women’s experience with myocardial infarction: a phenomenological approach
Creators: name: Bowers, Michele J.
Publisher: name: University of British Columbia
Year: 2009

description: The purpose of this study was to examine the nature of women's experience of myocardial infarction (MI) from a subjective perspective in order to explore and describe how women made meaning of this potentially life threatening event. A phenomenological approach was used to guide the data collection and analysis. Data were collected through in-depth semi- structured interviews with a volunteer sample of 10 female coresearchers hospitalized with MI at a local city hospital. The initial interview focused on obtaining a description of coresearcher's experience and was conducted after women were transferred from the critical care unit to the cardiac ward. I conducted validation interviews with co-researchers several weeks post hospital discharge via telephone. The validation interview provided co-researchers with the opportunity to confirm or clarify my understanding of the description of their MI experience, as well as providing any further information that would crystallize my understanding of their story. Audiotaped interviews were transcribed verbatim and analyzed according to Giorgi's (1975, 1985) method of phenomenological data analysis. Nine common themes emerged from the data including: (a) the experience of illness awareness; (b) the experience of feeling emotionally overwhelmed; (c) the experience of fear and worry; (d) the experience of loss; (e) difficulty asking for help; (f) the experience of needing information; (g) the experience of care and support; (h) making sense of the MI experience; and (i) the experience of planning for the future. evident in co-researcher accounts, the uniqueness of each woman was captured and reflected in the variations in which the themes were expressed. The implications of this research suggest the importance of understanding women's experience of MI at a subjective level in order to fully understand the extent and nature of women's issues and concerns within this area. Thus counselling psychologists should act as both educators and counsellors in order to raise the awareness of other health professionals as to the nature of women's experience of MI, to assist in the teaching of skills that would better enable the implementation of patient-centered care, and to provide women a forum through which they can receive counselling related to issues surrounding MI. Moreover, results of this study provide the basis for future research, and in helping medical professionals implement the provision of cardiac care that is more germane to women.
The Kähler-Ricci flow on surfaces of positive Kodaira dimension
Creators: name: Song, Jian
name: Tian, Gang
Publisher: name: arXiv
Year: 2006
Subjects: subject: Differential Geometry (math.DG)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics

description: The existence of Kähler-Einstein metrics on a compact Kähler manifold has been the subject of intensive study over the last few decades, following Yau's solution to Calabi's conjecture. The Ricci flow, introduced by Richard Hamilton has become one of the most powerful tools in geometric analysis. We study the Kähler-Ricci flow on minimal surfaces of Kodaira dimension one and show that the flow collapses and converges to a unique canonical metric on its canonical model. Such a canonical is a generalized Kähler-Einstein metric. Combining the results of Cao, Tsuji, Tian and Zhang, we give a metric classification for Käher surfaces with a numerical effective canonical line bundle by the Kähler-Ricci flow. In general, we propose a program of finding canonical metrics on canonical models of projective varieties of positive Kodaira dimension.
R\' enyi Holographic Dark Energy in Higher Dimension Cosmology
Creators: name: Saha, Arindam
name: Ghose, Souvik
name: Chanda, Anirban
name: Paul, Bikash Chandra
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Rényi holographic dark energy (RHDE) correspondence is discussed in higher dimensional cosmology, namely Kaluza-Klein (KK) cosmology. Both interacting and non-interacting cosmological scenario are considered here. It is found that the non-interacting model naturally leads to the late accelerated universe, unlike the standard Holographic Dark Energy models in 4$D$, which requires interaction to accommodate the late-time acceleration of the universe. The interacting model produces an accelerating universe at late time albeit failing to attain the estimated present value of the deceleration parameter. The evolution of different cosmologically relevant parameters have been estimated. We consider here two diagnostic tests namely, state-finder and $Om$ diagnostics to study the non-interacting model which is more favoured in the light of recent cosmological observations. Classical stability of the cosmological models are also discussed
description: 17 pages, 11 figures, Accepted for publication in Annals of Physics
Η επίδραση των άϋλων ανταμοιβών στην ψυχολογική ενδυνάμωση των εργαζομένων στο δημόσιο και στον ιδιωτικό τομέα:
Creators: name: Πολυχρονίδου, Παρθένα Αναστασίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Ψυχολογική ενδυνάμωση
Άϋλες ανταμοιβές
Δημόσιος και ιδιωτικός τομέας
Psychological Empowerment
Intrinsic rewards
Public and private sector

description: Ο κλάδος της διοίκησης ανθρωπίνου πόρου, γενικά τα τμήματα Δ.Α.Π. στις σύγχρονες επιχειρήσεις έχουν αυξηθεί τα τελευταία χρόνια και αποδεικνύουν καθημερινά πόσο σημαντικός είναι ο ρόλος τους σε μία σύγχρονη επιχείρηση. Σκοπός της διατριβής ήταν η μελέτη των άϋλων ανταμοιβών στην ψυχολογική ενδυνάμωση των εργαζομένων στον ιδιωτικό και στο δημόσιο τομέα. Συγκεκριμένα έξατάσαμε τις τρεις άϋλες ανταμοιβές αναγνώριση, ανάγκη για επίτευξη και δύναμη της ανάγκης για ανάπτυξη και την επίδραση τους. Η έρευνα που διεξήχθει χωρίστηκε σε δύο μέρη, το πρώτο αφορά μόνο τους εργαζομένους ιδιωτικών επιχειρήσεων και το δεύτερο τους εργαζομένους δημοσίων υπηρεσιών. Από την ανασκόπιση της υπάρχουσας βιβλιογραφίας καταλίξαμε σε τρεις βασικές υποθέσεις και παράλληλα προέκυψαν δύο ερευνητικές ερωτήσεις, σχετικά με την μεγαλύτερη επίδραση των ανταμοιβών στην ψυχολογική ενδυνάμωση των εργαζομένων του κάθε τομέα χωριστά. Ασχοληθήκαμε επίσης με την πρακτική εφαμογή των ευρημάτων και την θετική εξέλιξη που μπορούν να έχουν στην επαγγελματική καθημερηνότητα των διοικητικών στελεχών απο την μία και των στελεχών γραμμής από την άλλη. Τέλος, παρουσιάζουμε τα αποτελέσματα της έρευνας με κύριο στόχο να χρησιμεύσουν ώς βάση για περαιτέρω έρευνα σε αυτόν τον τομέα.
description: The human resource departments in modern businesses increased their number in the last years and continue to demonstrate every day the importance of their role in a modern business. The aim of the present thesis was the study of the impact of intrinsic rewards on the psychological empowerment of employees in the public and private sector. Specific, we examined the impact of the intrinsic rewards recognition, need for achievement and growth need strength. The research was cut in two main parts, the first part deals only with the employees in the private sector and the second one deals only with the employees in public services. After the review of literature we concluded three basic cases and also in two research questions, on the biggest impact of the intrinsic rewards on the psychological empowerment of the employees in each sector. We also deal with the practical application of the results and the positive development they may have in the everyday businesslife of managers on the one hand and employees on the other hand. We present the results with the aim that they will be used as a basic for further research in this department.
Structure and evolution of star-forming gas in late-type spiral galaxies
Creators: name: Fathi, Kambiz
name: Beckman, John E.
name: Zurita, Almudena
name: Relano, Monica
name: Knapen, Johan H.
name: Ostlin, Goran
name: Carignan, Claude
name: Chemin, Laurent
name: Daigle, Olivier
name: Hernandez, Olivier
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study two dimensional Fabry-Perot interferometric observations of the nearby face-on late-type spiral galaxy, NGC 628. We investigate the role of the individual HII regions together with the large-scale gravitational mechanisms which govern star formation and overall evolution in spiral galaxies. Our kinematical analysis (reinforced by literature maps in HI and CO at lower angular resolution) enables us to verify the presence of an inner rapidly rotating inner disk-like component which we attribute to long term secular evolution of the large-scale spiral arms and oval structure. We find that gas is falling in from the outer parts towards the bluer central regions. This could be an early phase in the formation of a pseudo-bulge. We find signatures of radial motions caused by an m=2 perturbation, which are likely to be responsible for the inflow of material forming the circumnuclear ring and the rapidly rotating inner structure.
description: To appear in the proceedings for IAU symposium 241. "Stellar Populations as Building Blocks of Galaxies", Editors: R.F. Peletier, A. Vazdekis
Searching for lambda Boo stars in binary systems
Creators: name: Alacoria, J.
name: Saffe, C.
name: Collado, A.
name: Alejo, A.
name: Calvo, D.
name: Miquelarena, P.
name: Gonzalez, E.
name: Flores, M.
name: Arancibia, M. Jaque
name: Gunella, F.
Publisher: name: arXiv
Year: 2025
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Our goal is to find new candidate lambda Boo stars that belong to binary systems. A detailed abundance determination of some candidates could confirm their true lambda Boo nature, while the composition of eventual late-type companions could be used as a proxy for the initial composition of the lambda Boo stars. Results. We obtained a group of 19 newly identified binary systems which contain a candidate lambda Boo star, allowing to duplicate the number of lambda Boo stars currently known in multiple systems. This important group could be used in further studies of lambda Boo stars. For the first time, we performed a detailed abundance analysis of three of these binary systems which includes a candidate lambda Boo star and a late-type companion. We confirmed the true lambda Boo nature of the three early-type stars (HD 87304, HD 98069 and HD 153747), and obtained mostly a solar-like composition for their late-type components. Adopting as a proxy the late-type stars, we showed that the three lambda Boo stars were initially born with a solar-like composition. This is an important constraint for any scenario trying to explain the origin of lambda Boo stars. Also, the solar-like composition of the late-type stars supports the idea that lambda Boo stars are Population I objects, however, we caution that other explanations are also possible. Conclusions. We performed, for the first time, a detailed abundance analysis of binary systems including a lambda Boo star and a late-type companion. We obtained a solid indication that lambda Boo stars born from a solar-like composition and established an important constraint to test formation models of lambda Boo stars.[abridged]
description: 11 pages, 9 figures, 9 tables, A&A accepted
The Virtual Photon-Gluon Impact Factor with Massive Quarks and Exact Gluon Kinematics
Creators: name: White, C. D.
name: Peschanski, R.
name: Thorne, R. S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We calculate the impact factor coupling a virtual photon to a gluon via a massive quark-antiquark pair at LL order, but with the imposition of the correct gluon kinematics. Exact analytical results are presented in triple Mellin space with respect to scaled Bjorken x, gluon transverse momentum and heavy quark mass. The application of these results to the calculation of approximate NLL coefficient functions needed to relate structure functions to the BFKL gluon is presented. The NLL effects with running coupling are seen to lead to a suppression of the small x divergence when compared with the fixed and running coupling LL results, but less than in the massless case.
description: 12 pages, 1 figure
Study of angular momentum effects in fission
Creators: name: Vogt, R.
name: Randrup, J.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Background: The role of angular momentum in fission has long been discussed but the observable effects are difficult to quantify. Purpose: We discuss a variety of effects associated with angular momentum in fission and present quantitative illustrations. Methods: We employ the fission simulation model $\mathtt{FREYA}$ which is well suited for this purpose because it obeys all conservation laws, including linear and angular momentum conservation at each step of the process. We first discuss the implementation of angular momentum in $\mathtt{FREYA}$ and then assess particular observables, including various correlated observables. We also study potential effects of neutron-induced fission of the low-lying isomeric state of $^{235}$U relative to the ground state. Results: The fluctuations inherent in the fission process ensure that the spin of the initial compound nucleus has only a small influence on the fragment spins which are therefore nearly uncorrelated. There is a marked correlation between the spin magnitude of the fission fragments and the photon multiplicity. We also consider the dynamical anisotropy caused by the rotation of an evaporating fragment and study especially the distribution of the projected neutron-neutron opening angles, showing that while it is dominated by the effect of the evaporation recoils, it is possible to extract the signal of the dynamical anisotropy by means of a Fourier decomposition. Finally, we note that the use of an isomeric target, $^{235 {\rm m}}$U($n_{\rm th}$,f), may enhance the symmetric yields and can thus result in higher neutron multiplicities for low total fragment kinetic energy.
description: 11 pages, 9 figures
J-PLUS: The star formation main sequence and rate density at d < 75 Mpc
Creators: name: Vilella-Rojo, G.
name: Logroño-García, R.
name: López-Sanjuan, C.
name: Viironen, K.
name: Varela, J.
name: Moles, M.
name: Cenarro, A. J.
name: Cristóbal-Hornillos, D.
name: Ederoclite, A.
name: Hernández-Monteagudo, C.
name: Marín-Franch, A.
name: Ramió, H. Vázquez
name: Galbany, L.
name: Delgado, R. M. González
name: Hernán-Caballero, A.
name: Lumbreras-Calle, A.
name: Sánchez-Blázquez, P.
name: Sobral, D.
name: Vílchez, J. M.
name: Alcaniz, J.
name: Angulo, R. E.
name: Dupke, R. A.
name: Sodré, L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Our goal is to estimate the star formation main sequence (SFMS) and the star formation rate density (SFRD) at z <= 0.017 (d < 75 Mpc) using the Javalambre Photometric Local Universe Survey (J-PLUS) first data release, that probes 897.4 deg2 with twelve optical bands. We extract the Halpha emission flux of 805 local galaxies from the J-PLUS filter J0660, being the continuum level estimated with the other eleven J-PLUS bands, and the dust attenuation and nitrogen contamination corrected with empirical relations. Stellar masses (M), Halpha luminosities (L), and star formation rates (SFRs) were estimated by accounting for parameters covariances. Our sample comprises 689 blue galaxies and 67 red galaxies, classified in the (u-g) vs (g-z) color-color diagram, plus 49 AGN. The SFMS is explored at log M > 8 and it is clearly defined by the blue galaxies, with the red galaxies located below them. The SFMS is described as log SFR = 0.83 log M - 8.44. We find a good agreement with previous estimations of the SFMS, especially those based on integral field spectroscopy. The Halpha luminosity function of the AGN-free sample is well described by a Schechter function with log L* = 41.34, log phi* = -2.43, and alpha = -1.25. Our measurements provide a lower characteristic luminosity than several previous studies in the literature. The derived star formation rate density at d < 75 Mpc is log rho_SFR = -2.10 +- 0.11, with red galaxies accounting for 15% of the SFRD. Our value is lower than previous estimations at similar redshift, and provides a local reference for evolutionary studies regarding the star formation history of the Universe.
description: 26 pages. Accepted for publication in Astronomy and Astrophysics
Introduction to Perceptual Experience Laboratory (PEL)
Creators: name: Admin, CardiffMet
Publisher: name: Cardiff Metropolitan University
Year: 2024
Subjects: classificationCode: 460399
subject: Computer vision and multimedia computation not elsewhere classified

description: Since 2011 FovoLab has been developing new ways to depict the world on two-dimensional images to the audience of the future - The Perceptual Experience Laboratory (PEL) represents the cutting edge of that work. PEL is a unique, goggle-less mixed-reality user testing environment that can be configured to accurately represent virtually any space in terms of sight, sound, smell, temperature and air movement. The facility can be configured in as little as half an hour. PEL was developed by two research groups: FovoLab and User Centred Design Research (UCD-R). It is comprised of a 2.5 metre high, 5K resolution cylindrical rear projection screen wrapped 200° around the participant. Smell, environment temperature, three-dimensional sound, air movement, digital projection, physical objects and actors are used to emulate environments realistically at a multi-sensory level, while body movements, eye movements, heartbeat variability and galvanic skin responses can all be monitored via state of the art user observation systems including timecoded video and audio recording from multiple sources. PEL can simulate virtually any environment in laboratory conditions. Its uses include medical product testing, diagnostic testing of vision conditions, testing in dangerous environments, remote testing scenarios etc. PEL offers immersion levels literally impossible in any other facility. Its ultimate goal is the development of a new type of VR. Accurately portraying the 3D world in 2D is one of humans’ oldest quests. FovoLab’s work in non-linear perspective imagery represents the new front line in this quest. Linear perspective - discovered in the early fifteenth century - remains the basis of most imaging technologies, including photography, cinematography, computer aided design, video gaming, x-rays, VR and AR. Elegant as it is, linear perspective models how light travels, not how humans experience and record visual experiences. Anyone who has ever tried to photograph the majesty of a beach or the grandeur of a cathedral will know that photographic depiction is no substitute for visual experience. This is because the multi-sensory human perceptual system captures and processes far more information than can be captured in an optically-derived photograph. E.g., the proportions and layout of our visual field change according to our chosen point of awareness, a reason why many artists create paintings with a single intended fixation point.
The Cosmology of f(R) Gravity in the Metric Variational Approach
Creators: name: Li, Baojiu
name: Barrow, John D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We consider the cosmologies that arise in a subclass of f(R) gravity with f(R)=R+μ^{2n+2}/(-R)^{n} and -1
description: 13 pages, 8 figures. References, comments and acknowledgements added, typos corrected, one paragraph added, title slightly modified; version accepted for publication in Physical Review D
Protocolos de laboratorio de biología celular
Creators: name: Bucchi, Cristina
name: Paulina, Martínez-Rodríguez
Publisher: name: Zenodo
Year: 2024
Subjects: laboratory protocols
Protocolos de laboratorio
mineralización
migración
viabilidad
secreción de interleuquinas
aislamiento de células madre
citometría de flujo
PCR
adhesión a dentina

description: El archivo contiene protocolos de laboratorio para los siguientes experimentos:

Preparación de Medios de cultivo y PBS 1xAislamiento de células madre de la pulpa dentaria (DPSCs)Aislamiento de Células madre de la papila apical (SCAPs)Cambio de MedioTripsinización: Pasaje o subcultivoCongelación de línea celularDescongelación de línea celularCitometría de flujo para determinar células troncales mesenquimalesViabilidad celularAdhesión a dentina de las células madreMedición de Interleuquinas pro y anti inflamatorias (ELISA)Mineralización mediante rojo de alizarinaExpresión génica - Protocolo RT-qPCR
Metal-Poor Stars Observed with the Southern African Large Telescope
Creators: name: Rasmussen, Kaitlin C.
name: Zepeda, Joseph
name: Beers, Timothy C.
name: Placco, Vinicius M.
name: Depagne, Eric
name: Frebel, Anna
name: Dietz, Sarah
name: Hartwig, Tilman
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present the first release of a large-scale study of relatively bright (V < 13.5) metal-poor stars observed with the Southern African Large Telescope (SALT), based on high-resolution spectra of 50 stars with a resolving power of R ~ 40,000 and S/N ~ 20 per pixel at 4300 Angstrom. The elemental abundances of C, Sr, Ba, and Eu are reported, as well as several alpha-elements (Mg, Ca, Sc, Ti, V) and iron-peak elements (Mn, Co, Ni, Zn). We find a diverse array of abundance patterns, including several consistent with the signatures of carbon-enhanced metal-poor CEMP-i and CEMP-r stars. We find that 15 of 50 (30%) are carbon enhanced (with [C/Fe] >+ 0.70), and that a large fraction (26 of 50, 52%) are enhanced in r-process elements, among the r-process-enhanced stars, five are strongly enhanced r-II ([Eu/Fe] >+ 1.0) stars (two of which are newly discovered) and 21 are newly discovered moderately enhanced r-I (+0.3 <= [Eu/Fe] <=+ 1..0) stars. There are eight stars in our sample that, on the basis of their abundances and kinematics, are possible members of the metal-weak thick-disk population. We also compare our measured abundances to progenitor-enrichment models, and find that the abundance patterns for the majority of our stars can be attributed to a single (rather than multiple) enrichment event.
Gravitational Solitons and the Squashed Seven-Sphere
Creators: name: Bizon, P.
name: Chmaj, T.
name: Gibbons, G. W.
name: Pope, C. N.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We discuss some aspects of higher-dimensional gravitational solitons and kinks, including in particular their stability. We illustrate our discussion with the examples of (non-BPS) higher-dimensional Taub-NUT solutions as the spatial metrics in (6+1) and (8+1) dimensions. We find them to be stable against small but non-infinitesimal disturbances, but unstable against large ones, which can lead to black-hole formation. In (8+1) dimensions we find a continuous non-BPS family of asymptotically-conical solitons connecting a previously-known kink metric with the supersymmetric A_8 solution which has Spin(7) holonomy. All the solitonic spacetimes we consider are topologcally, but not geometrically, trivial. In an appendix we use the techniques developed in the paper to establish the linear stability of five-dimensional Myers-Perry black holes with equal angular momenta against cohomogeneity-2 perturbations.
description: Minor typos corrected
ERICC Working Paper _ Evidence Gap and Literature Review Findings: Northwest Syria
Creators: name: ERICC Consortium
name: Akar, Bassel
name: Meskhi, Michael
name: Baldelli, Claudia
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 390201
subject: Education policy

description: The devastating and ongoing conflict in Syria which erupted in 2011 urgently necessitates research on education to assess and inform de facto policies, humanitarian and development initiatives that children’s rights to quality education, and mitigating the negative impact of conflict on the young generation. Through the conflict, the northwestern region of Syria transitioned away from the Syrian government. Turkish-backed non-state actors stepped in to govern areas of the northwestern region – referred to as opposition areas – striving to fill the gap left by the absent central government (henceforth, the regime). Amidst armed and political conflicts, children have become chronically vulnerable to the violation of their rights to protection and quality educational provisions. To promote evidence-based educational policies, interventions and directions for education aid, and development in Northwest Syria (NW Syria), the ERICC programme focuses on gathering, analysing and producing contextually relevant education research. In this initial phase, we review the existing research evidence published in academic journals and reports produced by organisations and research centres that examine the policy and local levels of the education system in NW Syria.Through this evidence review, we identify research gaps that help us formulate a research agenda that stakeholders in NW Syria can critically review and prioritise. We have found that the existing body of research studies has primarily focused on assessment of the status quo of school infrastructure, teacher workforce and children’s access to schooling. These studies were mostly designed to provide information to aid and development initiatives. However, they fall short in producing evidence on how to improve access to, quality and continuity of education, a lack of which undermines intervention programmes. The major gaps in research include further studies into improving governance, curriculum, pedagogy and assessment; producing and using data systems; reducing vulnerabilities and marginalisation, as well as an increased focus on caregivers and school-based practitioners and infrastructure and materials. Hence, this paper highlights the need for further research in NW Syria that focuses on how to develop human capacities to strengthen education systems, develop pedagogical approaches, and train/ support teachers and parents to enable more effective delivery of quality education to all children. At the same time it must address the inevitable violence in this context in children’s everyday lives.
Magnetic helicity signature and its role in regulating magnetic energy spectra and proton temperatures in the solar wind
Creators: name: Zhao, G. Q.
name: Lin, Y.
name: Wang, X. Y.
name: Feng, H. Q.
name: Wu, D. J.
name: Li, H. B.
name: Zhao, A.
name: Liu, Q.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: In a previous paper, we found that proton temperatures are clearly associated with the proton-scale turbulence in the solar wind, and magnetic helicity signature appears to be an important indicator in the association. Based on 15 years of in situ measurements, the present paper further investigates the magnetic helicity of solar wind turbulence and its role in regulating magnetic energy spectra and proton temperatures. Results show that the presence of the helicity signature is very common in solar wind turbulence at scales $0.3 \lesssim kρ_p \lesssim 1$, with $k$ being the wavenumber and $ρ_p$ the proton gyroradius. The sign of the helicity is mostly positive, indicating the dominance of right-handed polarization of the turbulence. The helicity magnitude usually increases with $k$ and $β_{{\parallel}p}$ (the proton parallel beta) when $kρ_p$ and $β_{{\parallel}p}$ are less than unity. As helicity magnitude increases, the power index of the energy spectrum becomes more negative, and the proton temperatures $T_{{\perp}p}$ and $T_{{\parallel}p}$ rise significantly, where $T_{{\perp}p}$ and $T_{{\parallel}p}$ are the perpendicular and parallel temperatures with respect to the background magnetic field. In particular, the rise of $T_{{\perp}p}$ is faster than $T_{{\parallel}p}$ when $β_{{\parallel}p} < 1$ is satisfied. The faster rise of $T_{{\perp}p}$ with the helicity magnitude may be interpreted as the result of the preferentially perpendicular heating of solar wind protons by kinetic Alfvén wave (KAW) turbulence.
description: 28 pages, 8 figures
A study of the double hadron neutrinoproduction on nuclei
Creators: name: Agababyan, N. M.
name: Ammosov, V. V.
name: Atayan, M.
name: Grigoryan, L.
name: Grigoryan, N.
name: Gulkanyan, H.
name: Ivanilov, A. A.
name: Karamyan, Zh.
name: Korotkov, V. A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The nuclear medium influence on the dihadron neutrinoproduction is investigated for the first time, using the data obtained with SKAT bubble chamber. An indication is obtained that the nuclear attenuation of the dihadron is more expressed for kinematically closest hadron pairs. The experimental data on the dihadron attenuation and on the ratio of the dihadron to single-hadron yields are compared with predictions of the two-scale string fragmentation model.
description: 5 pages, 10 figures