cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Additional file 1 of Meteorological factors and childhood diarrhea in Peru, 2005–2015: a time series analysis of historic associations, with implications for climate change
Creators: name: Delahoy, Miranda J.
name: Cárcamo, César
name: Huerta, Adrian
name: Lavado, Waldo
name: Escajadillo, Yury
name: Ordoñez, Luís
name: Vasquez, Vanessa
name: Lopman, Benjamin
name: Clasen, Thomas
name: Gonzales, Gustavo F.
name: Steenland, Kyle
name: Levy, Karen
Publisher: name: figshare
Year: 2021
Subjects: subject: Space Science
subject: Medicine
subject: Molecular Biology
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Cancer
subject: Inorganic Chemistry
subject: FOS: Chemical sciences
subject: Science Policy
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: Additional File 1. Comparison of model fit for different temperature variables. Table comparing model fit for temperature variables considered for models.
Spin Parity of Spiral Galaxies III -- Dipole Analysis of the Distribution of SDSS Spirals with 3D Random Walk Simulations
Creators: name: Iye, Masanori
name: Yagi, Masafumi
name: Fukumoto, Hideya
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Observation has not yet determined whether the distribution of spin vectors of galaxies is truly random. It is unclear whether is there any large-scale symmetry-breaking in the distribution of the vorticity field in the universe. Here, we present a formulation to evaluate the dipole component D_{max} of the observed spin distribution, whose statistical significance sigma_{D} can be calibrated by the expected amplitude for 3D random walk (random flight) simulations. We apply this formulation to evaluate the dipole component in the distribution of Sloan Digital Sky Survey (SDSS) spirals. Shamir(2017a) published a catalog of spiral galaxies from the SDSS DR8, classifying them with his pattern recognition tool into clockwise and counterclockwise (Z-spiral and S-spirals, respectively). He found significant photometric asymmetry in their distribution. We have confirmed that this sample provides dipole asymmetry up to a level of sigma_{D}=4.00. However, we also found that the catalog contains a significant number of multiple entries of the same galaxies. After removing the duplicated entries, the number of samples shrunk considerably to 45%. The actual dipole asymmetry observed for the 'cleaned' catalog is quite modest, sigma_{D}=0.29. We conclude that SDSS data alone does not support the presence of a large-scale symmetry-breaking in the spin vector distribution of galaxies in the local universe. The data are compatible with a random distribution.
description: 8 pages, 4 figures, accepted and to be published in ApJ
Additional file 1 of Characterization of hospital airborne SARS-CoV-2
Creators: name: Stern, Rebecca A.
name: Koutrakis, Petros
name: Martins, Marco A. G.
name: Lemos, Bernardo
name: Dowd, Scot E.
name: Sunderland, Elsie M.
name: Garshick, Eric
Publisher: name: figshare
Year: 2021
Subjects: subject: Biophysics
subject: Space Science
subject: Medicine
subject: Cell Biology
subject: Molecular Biology
subject: Biotechnology
subject: Ecology
subject: FOS: Biological sciences
subject: Cancer
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: 60506 Virology
subject: Computational Biology

description: Additional file 1: Table S1. Primers and probes used to target the nucleocapsid N gene1. Table S2. Patients in the emergency department (ED) and positive samples in the ED. Figure S1. Method for calculating copies/m3 from the qPCR copy number. A standard curve was used to estimate the number of copies per 2 µL of cDNA used in qPCR.
Efficiency-optimal operating conditions for single-phase induction motors
Creators: name: Cummings, Gerald Floyd
Publisher: name: University of British Columbia
Year: 2009

description: The double-revolving field model is used to determine theoretically efficiencyoptimal operating conditions for single-phase induction motors equipped with an auxiliary winding. The algorithm developed determines the optimal values of main winding current, auxiliary winding current and stator frequency for any desired combination of torque and rotor speed within the motor's ratings. Computer simulations are presented to validate theoretical results and relate optimal terminal voltages to computed winding currents. Experimental measurements made on a 2 pole, 1 hp, 230V submersible motor are compared with computer simulations. These measurements reveal that while it is most important to control core losses by matching the V/Hz ratio to the load, it is possible to make further efficiency improvements by exciting the auxiliary winding.
Η ασφάλεια των ανηλίκων στο Διαδίκτυο
Creators: name: Τενεκετζή, Ιφιγένεια Στέφανου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Διαδικτυακός εκφοβισμός
Παιδική πορνογραφία
Παιδική αποπλάνηση
Cyber bullying
Child Pornography
Grooming

description: Σκοπός της παρούσας διπλωματικής εργασίας ήταν η μελέτη του φαινομένου της παιδικής πορνογραφίας και του διαδικτυακού εκφοβισμού τα οποία αποτελούν ένα σύνολο στοχευόμενων ενεργειών για την εκμετάλλευση, παρενόχληση ή και προσβολή των παιδιών από συνομήλικους τους ή άτομα μεγαλύτερης ηλικίας με τη χρήση ηλεκτρονικού υπολογιστή ή κινητών τηλεφώνων διά του Διαδικτύου. Ακόμη, αναφερθήκαμε αναλυτικά στο νομοθετικό πλαίσιο το οποίο προστατεύει τα παιδιά στην περίπτωση που πέσουν θύματα αυτών των φαινομένων με βάση το ελληνικό Σύνταγμα. Επίσης, κάναμε μια συνοπτική περιγραφή του φαινομένου του σχολικού εκφοβισμού παρουσιάζοντας παράλληλα και τους νόμους που πλαισιώνουν τέτοιες συμπεριφορές στην Ελλάδα.
description: The aim of the present thesis was the study of the case of child’s pornography and cyber bullying, which consist the whole of well programmed activities for the exploitation, harassment and assault from children with the same age or older people with the use of personal computer or mobile phones via internet. Furthermore, we elaborated legislative framework to protect children in case they become victims of these phenomena based on Greek Constitution. We also made a brief description of the phenomenon of bullying has experienced and the laws that surround such attitudes in Greece.
Η επίδραση κοινωνικών και οικονομικών παραμέτρων στις επιδόσεις των παιδιών στα μαθηματικά. Η συνεισφορά ειδικών διδακτικών παρεμβάσεων
Creators: name: Ζαχάρος, Κ.
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 2015

description: Παιδαγωγική Επιθεώρηση, Vol. 34 (2002)
Herbig-Haro flows around BBWo 192E (GM 1-23) nebula
Creators: name: Magakian, T. Yu.
name: Movsessian, T. A.
name: Andreasyan, H. R.
name: Bally, J.
name: Rastorguev, A. S.
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 studied a small comet-shape reflection nebula, located in the dark cloud SL 4 in the Vela Molecular Ridge cloud C, known as BBWo 192E (GM 1-23), and a young infrared cluster embedded into the nebula, for the evidences of recent star formation. We obtained the images of BBWo 192E in Halpha and [SII] lines and in SDSS i' with Blanco telescope at the Cerro Tololo Interamerican Observatory to discover new Herbig-Haro (HH) flows. 2MASS and WISE surveys were used for the search of the additional member stars of the cluster. We also studied proper motions and parallaxes of the cluster members with the aid of GAIA DR2. Five new groups containing at least 9 HH objects tracing several distinct outflows were revealed. A previously unreported reflection nebula and a number of probable outflow sources were found in the infrared range. The proper motions allowed selecting eight probable member stars in the visual range. Their parallaxes correspond to a mean distance 800 +/- 100 pc for this cluster. The bolometric luminosities of the brightest cluster members are 1010 L(sun) (IRAS 08513-4201,the strong source in the center of the cluster) and 2 to 6 L(sun) for the five other stars. The existence of the optical HH flows around the infrared cluster of YSOs suggests that star formation in this cloud is on-going around the more massive HAeBe star. By its morphology and other features this star-forming region is similar to the zone of star formation near CPM 19.
description: 8 pages, 11 figures
Limits on the Electromagnetic and Weak Dipole Moments of the Tau-Lepton in E_6 Superstring Models
Creators: name: Gutierrez-Rodriguez, A.
name: Hernandez-Ruiz, M. A.
name: Perez, M. A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We obtain limits on the electromagnetic and weak dipole moments of the tau-lepton in the framework of a Left-Right symmetric model (LRSM) and a class of $E_6$ inspired models with an additional neutral vector boson $Z_θ$. Using as an input the data obtained by the L3 and OPAL Collaborations for the reaction $e^+e^-\to τ^+τ^-γ$, we get a stringent limit on the LRSM mixing angle $ϕ$, $-1.66\times 10^{-3}< ϕ<1.22\times 10^{-3}$, which in turn induces bounds on the tau weak dipole moments which are consistent with the bounds obtained recently by the DELPHI and ALEPH Collaborations from the reaction $e^+e^-\to τ^+τ^-$. We also get similar bounds for the weak dipole moments of the tau lepton in the framework of $E_6$ superstring models.
description: 18 pages, 5 figures
First searches for gravitational waves from r-modes of the Crab pulsar
Creators: name: Rajbhandari, Binod
name: Owen, Benjamin J.
name: Caride, Santiago
name: Inta, Ra
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present the first searches for gravitational waves from r-modes of the Crab pulsar, coherently and separately integrating data from three stretches of the first two observing runs of Advanced LIGO using the F-statistic. The second run was divided in two by a glitch of the pulsar roughly halfway through. The frequencies and derivatives searched were based on radio measurements of the pulsar's spin-down parameters as described in Caride et al., Phys. Rev. D 100, 064013 (2019). We did not find any evidence of gravitational waves. Our best 90% confidence upper limits on gravitational wave intrinsic strain were 1.5e-25 for the first run, 1.3e-25 for the first stretch of the second run, and 1.1e-25 for the second stretch of the second run. These are the first upper limits on gravitational waves from r-modes of a known pulsar to beat its spin-down limit, and they do so by more than an order of magnitude in amplitude or two orders of magnitude in luminosity.
description: 6 pages, 2 figures
Additional file 2 of The eukaryotic MEP-pathway genes are evolutionarily conserved and originated from Chlaymidia and cyanobacteria
Creators: name: Liping Zeng
name: Dehesh, Katayoon
Publisher: name: figshare
Year: 2021
Subjects: subject: Genetics
subject: FOS: Biological sciences
subject: Evolutionary Biology
subject: Plant Biology

description: Additional file 2: Table S1. Synonymous (dN) and nonsynonymous (dS) substitution rates estimated by PAML. Table S2. The relative expression ratio of the MEP-pathway genes in represented species. Table S3. The Codon Adaption Index of the MEP-pathway genes.
Uniqueness and examples of compact toric Sasaki-Einstein metrics
Creators: name: Cho, Koji
name: Futaki, Akito
name: Ono, Hajime
Publisher: name: arXiv
Year: 2007
Subjects: subject: Differential Geometry (math.DG)
subject: Mathematical Physics (math-ph)
subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 53C55, 53C21, 55N91

description: In [11] it was proved that, given a compact toric Sasaki manifold of positive basic first Chern class and trivial first Chern class of the contact bundle, one can find a deformed Sasaki structure on which a Sasaki-Einstein metric exists. In the present paper we first prove the uniqueness of such Einstein metrics on compact toric Sasaki manifolds modulo the action of the identity component of the automorphism group for the transverse holomorphic structure, and secondly remark that the result of [11] implies the existence of compatible Einstein metrics on all compact Sasaki manifolds obtained from the toric diagrams with any height, or equivalently on all compact toric Sasaki manifolds whose cones have flat canonical bundle. We further show that there exists an infinite family of inequivalent toric Sasaki-Einstein metrics on $S^5 \sharp k(S^2 \times S^3)$ for each positive integer $k$.
description: Statements of the results are modified
TIMBÓ E CUNAMBÍ: DUAS PLANTAS AMAZÔNICAS UTILIZADAS PARA CONTEXTUALIZAÇÃO REGIONAL EM AULAS DE QUÍMICA
Creators: name: JOSIVAN DA SILVA COSTA
Publisher: name: Zenodo
Year: 2023

description: A Principal objetivo da contextualização, em uma visão pedagógica, é a proposição de conteúdos que estejam mais próximos ou relacionados às vivências pessoais dos estudantes. Por esse motivo, a proposição de temas, nas mais variadas disciplinas da educação básica, tem sido alvo de constantes buscas em pesquisas em educação.

Isso se torna ainda mais importante, quando se fala de disciplinas como a física, a química e a matemática. Nesse caso específico, no ensino de química, a contextualização pode ser muito significativa por se tratar de uma disciplina com alto nível de abstração. O que historicamente, tem mostrado complexidade no processo de ensino e aprendizagem, devido às dificuldades dos estudantes para construírem relações cognitivas lógicas com essas abstrações.

Nesse sentido, neste estudo, será proposta a utilização dos conhecimentos sobre substâncias químicas oriundas de duas espécies vegetais amazônicas, para elaboração de aulas contextualizadas com o conhecimento de povos originários amazônicos.
description: Josivan da Silva CostaProfessor SEED - Amapá
description: Este trabalho faz parte do livro digital: Anais do III Congresso Amazonense de Educação. Educação em destaque: projetos, estudos e pesquisas para além da sala de aula.ISBN: 978-65-00-87523-2
Additional file 1 of The eukaryotic MEP-pathway genes are evolutionarily conserved and originated from Chlaymidia and cyanobacteria
Creators: name: Liping Zeng
name: Dehesh, Katayoon
Publisher: name: figshare
Year: 2021
Subjects: subject: Genetics
subject: FOS: Biological sciences
subject: Evolutionary Biology
subject: Plant Biology

description: Additional file 1: Figure S1. Phylogenetic tree of DXS. Figure S2. Phylogenetic tree of MDS. Figure S3. Phylogenetic tree of DXR. Figure S4. Phylogenetic tree of HDR. Figure S5. Phylogenetic tree of CMS. Figure S6. Phylogenetic tree of CMK. Figure S7. Phylogenetic tree of HDS.
Statistical Models of Fracture
Creators: name: Alava, Mikko J.
name: Nukala, Phani K. V. V.
name: Zapperi, Stefano
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Disorder and long-range interactions are two of the key components that make material failure an interesting playfield for the application of statistical mechanics. The cornerstone in this respect has been lattice models of the fracture in which a network of elastic beams, bonds or electrical fuses with random failure thresholds are subject to an increasing external load. These models describe on a qualitative level the failure processes of real, brittle or quasi-brittle materials. This has been particularly important in solving the classical engineering problems of material strength: the size dependence of maximum stress and its sample to sample statistical fluctuations. At the same time, lattice models pose many new fundamental questions in statistical physics, such as the relation between fracture and phase transitions. Experimental results point out to the existence of an intriguing crackling noise in the acoustic emission and of self-affine fractals in the crack surface morphology. Recent advances in computer power have enabled considerable progress in the understanding of such models. Among these partly still controversial issues, are the scaling and size effects in material strength and accumulated damage, the statistics of avalanches or bursts of microfailures, and the morphology of the crack surface. Here we present an overview of the results obtained with lattice models for fracture, highlighting the relations with statistical physics theories and more conventional fracture mechanics approaches.
description: 148 pages, 65 Figures
A Novel Machine Learning Approach to Disentangle Multi-Temperature Regions in Galaxy Clusters
Creators: name: Rhea, Carter L.
name: Hlavacek-Larrondo, Julie
name: Perreault-Levasseur, Laurence
name: Gendron-Marsolais, Marie-Lou
name: Kraft, Ralph
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: The hot intra-cluster medium (ICM) surrounding the heart of galaxy clusters is a complex medium comprised of various emitting components. Although previous studies of nearby galaxy clusters, such as the Perseus, the Coma, or the Virgo cluster, have demonstrated the need for multiple thermal components when spectroscopically fitting the ICM's X-ray emission, no systematic methodology for calculating the number of underlying components currently exists. In turn, underestimating or overestimating the number of components can cause systematic errors in the emission parameter estimations. In this paper, we present a novel approach to determining the number of components using an amalgam of machine learning techniques. Synthetic spectra containing a various number of underlying thermal components were created using well-established tools available from the \textit{Chandra} X-ray Observatory. The dimensions of the training set was initially reduced using the Principal Component Analysis and then categorized based on the number of underlying components using a Random Forest Classifier. Our trained and tested algorithm was subsequently applied to \textit{Chandra} X-ray observations of the Perseus cluster. Our results demonstrate that machine learning techniques can efficiently and reliably estimate the number of underlying thermal components in the spectra of galaxy clusters, regardless of the thermal model (MEKAL versus APEC). %and signal-to-noise ratio used. We also confirm that the core of the Perseus cluster contains a mix of differing underlying thermal components. We emphasize that although this methodology was trained and applied on \textit{Chandra} X-ray observations, it is readily portable to other current (e.g. XMM-Newton, eROSITA) and upcoming (e.g. Athena, Lynx, XRISM) X-ray telescopes. The code is publicly available at \url{https://github.com/XtraAstronomy/Pumpkin}.
description: 13 pages; accepted to AJ
Εκπαιδευτικά προγράμματα μουσειακής αγωγής: μια πρόταση για τη μοντελοποίηση και αξιολόγηση τους
Creators: name: Στυλιανίδης, Μάριος
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 2015

description: Παιδαγωγική Επιθεώρηση, Vol. 34 (2002)
Additional file 2 of Perinatal outcome after vacuum assisted delivery with digital feedback on traction force; a randomised controlled study
Creators: name: Romero, Stefhanie
name: Pettersson, Kristina
name: Yousaf, Khurram
name: Westgren, Magnus
name: Ajne, Gunilla
Publisher: name: figshare
Year: 2021
Subjects: subject: Space Science
subject: Medicine
subject: Cell Biology
subject: Neuroscience
subject: Biotechnology
subject: Sociology
subject: FOS: Sociology
subject: Cancer
subject: Science Policy

description: Additional file 2: Table S2. Per protocol subgroup analysis of haptic feedback response and conversion of VAD.
Additional file 1 of Perinatal outcome after vacuum assisted delivery with digital feedback on traction force; a randomised controlled study
Creators: name: Romero, Stefhanie
name: Pettersson, Kristina
name: Yousaf, Khurram
name: Westgren, Magnus
name: Ajne, Gunilla
Publisher: name: figshare
Year: 2021
Subjects: subject: Space Science
subject: Medicine
subject: Cell Biology
subject: Neuroscience
subject: Biotechnology
subject: Sociology
subject: FOS: Sociology
subject: Cancer
subject: Science Policy

description: Additional file 1: Table S1. Results analysis secondary outcome (by protocol) (low- and mid vacuum extractions).
Quantum Entanglement and Thermal Behavior in Charged-Current Weak Interactions
Creators: name: Iskander, G.
name: Pan, J.
name: Tyler, M.
name: Weber, C.
name: Baker, O. K.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We show that quantum entanglement between causally separated regions of a nucleon in antineutrino-nucleon scattering manifests itself as a thermal component in the resulting pion momentum distribution. For antineutrino scattering coherently from the (carbon) nucleus as a whole, this thermal component is absent, as expected by our quantum entanglement thermalization proposition. These phenomena, which have been observed in proton-proton collisions at the Large Hadron Collider, and in electromagnetic deep inelastic scattering, are now for the first time shown to exist in electroweak interactions as well.
description: 8 pages, 3 figures
The Complex Mid-Infrared Structure at the Heart of IRAS 20126+4104
Creators: name: De Buizer, James M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The mid-infrared emission at the center of IRAS 21026+4104 is not that of a simple compact source, as one would expect from an isolated high mass protostellar object. Furthermore the central thermal infrared emission does not appear to be coming directly from a circumstellar disk as has been recently hypothesized from near-infrared observations. The mid-infrared structure is complex, but with the help of multiple wavelength information two plausible scenarios to explain the emission in the region are advanced. The first is that there is a tight cluster of young stellar objects here. The second is that the mid-infrared emission and masers are delineating the walls of the outflow cavities of a massive stellar source located in the center of the near- and mid-infrared dark lane.
description: To appear in ApJ Letters, version with full resolution figures available at http://www.ctio.noao.edu/~debuizer
Expectations on $B\to (K^*_{0}(1430),K^*_{2}(1430))ϕ$ decays
Creators: name: Chen, Chuan-Hung
name: Geng, Chao-Qiang
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: As the annihilation contributions play important roles in solving the puzzle of the small longitudinal polarizations in $B\to K^* ϕ$ decays, we examine the similar effects in the decays of $B\to K^*_{0,2}(1430) ϕ$. For the calculations on the annihilated contributions, we adopt that the form factors in $B\to K^{(*)} ϕ$ decays are parameters determined by the observed branching ratios (BRs), polarization fractions (PFs) and relative angles in experiments and we connect the parameters between $B\to K^*_{0(2)} ϕ$ and $B\to K^{(*)}ϕ$ by the ansatz of correlating $\la K^*_n(1430) ϕ| (V-A)_μ|0\ra$ to $\la K^{(*)} ϕ| (V-A)_μ|0\ra$. We find that the BR of $B_d\to K^{*0}_{0}(1430) ϕ$ is $(3.69 \pm 0.47)\times 10^{-6}$. By using the transition form factors of $B\to K^*_2(1430)$ in the light-front quark model (LFQM) and the 2nd version of Isgur-Scora-Grinstein-Wise (ISGW2), we show that BR of $B_d\to K^{*0}_{2}(1430)ϕ$ is a broad allowed value and $(1.70\pm0.80)\times 10^{-6}$, respectively. In terms of the recent BABAR's observations on BRs and PFs in $B_d\to K^{*0}_{2}(1430)ϕ$, the results in the LFQM are found to be more favorable. In addition, due to the annihilation contributions to $B\to K^*_2ϕ$ and $B\to K^*ϕ$ being opposite in sign, we demonstrate that the longitudinal polarization of $B_d\to K^{*0}_2(1430) ϕ$ is always O(1) with or without including the annihilation contributions.
description: 20 pages, 4 figures, references added, version to appear in Phys. Rev. D
Tidal Effects and the Environment Dependence of Halo Assembly
Creators: name: Hahn, Oliver
name: Porciani, Cristiano
name: Dekel, Avishai
name: Carollo, C. Marcella
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We explore a possible origin for the puzzling anti-correlation between the formation epoch of galactic dark-matter haloes and their environment density. This correlation has been revealed from cosmological N-body simulations and is in conflict with the Extended Press-Schechter model of halo clustering. Using similar simulations, we first quantify the straightforward association of an early formation epoch with a reduced mass growth rate at late times. We then find that a primary driver of suppressed growth, by accretion and mergers, is tidal effects dominated by a neighbouring massive halo. The tidal effects range from a slowdown of the assembly of haloes due to the shear along the large-scale filaments that feed the massive halo to actual mass loss in haloes that pass through the massive halo. Using the restricted three-body problem, we show that haloes are prone to tidal mass loss within 1.5 virial radii of a larger halo. Our results suggest that the dependence of formation epoch on environment density is a secondary effect induced by the enhanced density of haloes in filaments near massive haloes where the tides are strong. Our measures of assembly rate are particularly correlated with the tidal field at high redshifts z~1.
description: 16 pages, 13 figures, MNRAS accepted. significantly expanded discussion of the connection of tides, shear and assembly. Version with high-resolution figures available at http://www.exp-astro.phys.ethz.ch/hahn/pub/HPDC09.pdf
On Goldstone bosons decoupling from high-lying hadrons
Creators: name: Glozman, L. Ya.
name: Nefediev, A. V.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Theory (hep-th)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: In this paper, we discuss a decoupling of the Goldstone bosons from highly excited hadrons in relation to the restoration of chiral symmetry in such hadrons. We use a generalised Nambu-Jona-Lasinio model with the interaction between quarks in the form of an instantaneous Lorentz-vector confining potential. This model is known to provide spontaneous breaking of chiral symmetry in the vacuum via the standard selfenergy loops for valence quarks. For highly excited hadrons, where the typical momentum of valence quarks is large, the loop contributions represent only a small correction to the chiral-invariant classical contributions and asymptotically vanish. Consequently the chiral symmetry violating Lorentz-scalar dynamical mass of quarks vanishes. Then the conservation of the axial vector current in the chiral limit requires, via the Goldberger-Treiman relation, that the valence quarks decouple from the Goldstone boson. As a consequence, the whole hadron decouples from the Goldstone boson as well, which implies that its axial constant also vanishes.
description: RevTeX4, 21 pages, 5 Postscript figures, uses epsfig.sty, new chapter with numerical estimates added, to appear in Phys.Rev.D
Generally covariant quantization and the Dirac field
Creators: name: Leclerc, M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Canonical Hamiltonian field theory in curved spacetime is formulated in a manifestly covariant way. Second quantization is achieved invoking a correspondence principle between the Poisson bracket of classical fields and the commutator of the corresponding quantum operators. The Dirac theory is investigated and it is shown that, in contrast to the case of bosonic fields, in curved spacetime, the field momentum does not coincide with the generators of spacetime translations. The reason is traced back to the presence of second class constraints occurring in Dirac theory. Further, it is shown that the modification of the Dirac Lagrangian by a surface term leads to a momentum transfer between the Dirac field and the gravitational background field, resulting in a theory that is free of constraints, but not manifestly hermitian.
description: final version, to appear in Annals Phys
Focus wave mode pulses from cylindrical apertures
Creators: name: Allexandre, Didier
Publisher: name: University of British Columbia
Year: 2009

description: Previous works have shown that it is possible to create a pulsed beam of acoustic energy which maintains amplitude and beam width better than either conventional single frequency or wide-band beams of comparable frequency content. The reconstruction technique to date uses Helmholtz' approximation on a planar array composed of individually addressable elements. In this work, a new array geometry is studied. Simulated focused scalar fields representing approximations to the Focus Wave Modes (FWM) are generated from a finite cylindrical aperture. The driving functions are derived using Huygens' representation for an infinite cylindrical surface. Performance of this new launching scheme is compared to the planar array launch of FWMs and Gaussian pulses. Through the course of simulations, we illustrate how the array spacing or discretization and the surface truncation affect the reconstruction quality and performance. The influence of array size and shape defined by the ratio of length over radius on the spreading and attenuation of the radiated beam is studied. The beam width, amplitude and sidelobe intensity are compared to those obtained from a planar array. It is shown that the cylinder length can be truncated to a certain value, Z[sub pc1], without affecting the pulse reconstruction at the origin. A shorter array can also be used with some loss in reconstruction quality. The generated localized wave from the cylindrical aperture is also compared to the Gaussian pulse. It is shown that a sufficient cylinder length will generate a field with better quality close to the array and similar performance and quality for further distances than that synthesized by a planar array of the same radius. Finally we use an approximation of the source functions to solve the problem caused by space-time inseparability of localized waves. We show that it is possible to find a simple relation between the various functions that drive the array elements. Without affecting significantly the radiated field, this method reduces dramatically the number of independent generators that are necessary to launch the pulse. The pulse can be generated from a cylindrical aperture using a single generator—while for a planar array of the same radius, more than 4000 independent generators would be required to obtain a similar beam quality.
MOONRISE: The Main MOONS GTO Extragalactic Survey
Creators: name: Maiolino, R.
name: Cirasuolo, M.
name: Afonso, J.
name: Bauer, F. E.
name: Bowler, R.
name: Cucciati, O.
name: Daddi, E.
name: De Lucia, G.
name: Evans, C.
name: Flores, H.
name: Gargiulo, A.
name: Garilli, B.
name: Jablonka, P.
name: Jarvis, M.
name: Kneib, J. -P.
name: Lilly, S.
name: Looser, T.
name: Magliocchetti, M.
name: Man, Z.
name: Mannucci, F.
name: Maurogordato, S.
name: McLure, R. J.
name: Norberg, P.
name: Oesch, P.
name: Oliva, E.
name: Paltani, S.
name: Pappalardo, C.
name: Peng, Y.
name: Pentericci, L.
name: Pozzetti, L.
name: Renzini, A.
name: Rodrigues, M.
name: Royer, F.
name: Serjeant, S.
name: Vanzi, L.
name: Wild, V.
name: Zamorani, G.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The MOONS instrument possesses an exceptional combination of large multiplexing, high sensitivity, broad simultaneous spectral coverage (from optical to near-infrared bands), large patrol area and high fibre density. These properties provide the unprecedented potential of enabling, for the very first time, SDSS-like surveys around Cosmic Noon (z~1-2.5), when the star formation rate in the Universe peaked. The high-quality spectra delivered by MOONS will sample the same nebular and stellar diagnostics observed in extensive surveys of local galaxies, providing an accurate and consistent description of the evolution of various physical properties of galaxies, and hence a solid test of different scenarios of galaxy formation and transformation. Most importantly, by spectroscopically identifying hundreds of thousands of galaxies at high redshift, the MOONS surveys will be capable of determining the environments in which primeval galaxies lived and will reveal how such environments affected galaxy evolution. In this article, we specifically focus on the main Guaranteed Time Observation (GTO) MOONS extragalactic survey, MOONRISE, by providing an overview of its scientific goals and observing strategy.
description: 6 pages, 6 figures, Published on the ESO Messenger No. 180
Ελληνική γλώσσα και πληροφορική τεχνολογία: πρόταση για τη διαμόρφωση εκπαιδευτικής πολιτικής
Creators: name: Κουτσογιάννης, Δ.
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 2015

description: This article reads as a proposal for the development of an educational policy in the field of computers and literacy education. We point out that an instrumentalist approach, which is marked both by unreasonable emphasis on the capabilities of the machines and by inappropriate attention to the complexity of the issues involved, has so far dominated the field. Our claim is that this approach ought to be replaced by a policy that takes into account all the variables that come into play. We move on to outline the major aspects of this policy.
description: Παιδαγωγική Επιθεώρηση, Vol. 34 (2002)
BALANCING HERITAGE PRESERVATION AND TOURISM: VISITOR MANAGEMENT IN FASIL GHEBBI, ETHIOPIA
Creators: name: Habtamu Tadesse, Alemu
name: Assefa, Yohannes Tsegaye
Publisher: name: Klover
Year: 2024
Subjects: Visitor management, Sustainable tourism development, Fasil Ghebbi, Ethiopia, Heritage sites.

description: Fasil Ghebbi, a UNESCO World Heritage Site in Ethiopia, faces both opportunities and challenges in managing visitor flows to ensure sustainable tourism development. This paper examines the practices and challenges associated with implementing visitor management strategies in Fasil Ghebbi. By analyzing existing literature and empirical data, it sheds light on the complexities of managing tourism in heritage sites and proposes solutions to enhance sustainability. Through a comprehensive exploration of visitor management practices and associated challenges, this paper provides valuable insights for policymakers, stakeholders, and practitioners seeking to promote sustainable tourism in Fasil Ghebbi and similar destinations.
Unitarity and the Hilbert space of quantum gravity
Creators: name: Hsu, Stephen D. H.
name: Reeb, David
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Under the premises that physics is unitary and black hole evaporation is complete (no remnants, no topology change), there must exist a one-to-one correspondence between states on future null and timelike infinity and on any earlier spacelike Cauchy surface (e.g., slices preceding the formation of the hole). We show that these requirements exclude a large set of semiclassical spacetime configurations from the Hilbert space of quantum gravity. In particular, the highest entropy configurations, which account for almost all of the volume of semiclassical phase space, would not have quantum counterparts, i.e. would not correspond to allowed states in a quantum theory of gravity.
description: 7 pages, 3 figures, revtex; minor changes in v2 (version published in Class. Quant. Grav.)
Models of Distorted and Evolving Dark Matter Halos
Creators: name: Sanders, J. L.
name: Lilley, E. J.
name: Vasiliev, E.
name: Evans, N. W.
name: Erkal, D.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We investigate the ability of basis function expansions to reproduce the evolution of a Milky Way-like dark matter halo, extracted from a cosmological zoom-in simulation. For each snapshot, the density of the halo is reduced to a basis function expansion, with interpolation used to recreate the evolution between snapshots. The angular variation of the halo density is described by spherical harmonics, and the radial variation either by biorthonormal basis functions adapted to handle truncated haloes or by splines. High fidelity orbit reconstructions are attainable using either method with similar computational expense. We quantify how the error in the reconstructed orbits varies with expansion order and snapshot spacing. Despite the many possible biorthonormal expansions, it is hard to beat a conventional Hernquist-Ostriker expansion with a moderate number of terms ($\gtrsim15$ radial and $\gtrsim6$ angular). As two applications of the developed machinery, we assess the impact of the time-dependence of the potential on (i) the orbits of Milky Way satellites, and (ii) planes of satellites as observed in the Milky Way and other nearby galaxies. Time evolution over the last 5 Gyr introduces an uncertainty in the Milky Way satellites' orbital parameters of $\sim 15$ per cent, comparable to that induced by the observational errors or the uncertainty in the present-day Milky Way potential. On average, planes of satellites grow at similar rates in evolving and time-independent potentials. There can be more, or less, growth in the plane's thickness, if the plane becomes less, or more, aligned with the major or minor axis of the evolving halo.
description: MNRAS, submitted
Comment on "Theoretical analysis of the transmission phase shift of a quantum dot in the presence of Kondo correlations"
Creators: name: Aharony, A.
name: Entin-Wohlman, O.
name: Oreg, Y.
name: von Delft, J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Recently, A. Jerez, P. Vitushinsky and M. Lavagna [Phys. Rev. Lett. 95, 127203 (2005)] claimed that the transmission phase through a quantum fot, as measured via the Aharonov-Bohm interferometer, differs from the phase which determines the corresponding conductance. Here we show that this claim is wrong for the single level Anderson model, which is usually used to describe the quantum dot. So far, there exists no derivation of this claim from any explicit theoretical model.
description: To appear as a Comment in PRL
An Implication of "Gravity as the Weakest Force"
Creators: name: Medved, A. J. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The negative specific heat of a radiating black hole is indicative of a cataclysmic endpoint to the evaporation process. In this letter, we suggest a simple mechanism for circumventing such a dramatic outcome. The basis for our argument is a conjecture that was recently proposed by Arkani-Hamed and collaborators. To put it another way, we use their notion of ``Gravity as the Weakest Force'' as a means of inhibiting the process of black hole evaporation.
description: 7 pages; v2 some discussion clarified
Το φαινόμενο ''bullying'' στο χώρο του σχολείου και η άσκηση σωματικής και ψυχολογικής βίας από συνομήλικους
Creators: name: Ανδρέου, Ελένη
name: Smith, P. K.
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 2015

description: It is an undeniable fact, verified by many empirical studies, that there are children who are continuously harassed by their peers at school. When there is an imbalance of power and harassment (which can be direct or indirect physical or verbal) happens intentionally and repeatedly, it can be called bullying. Bullying not only causes considerable suffering to individual pupils but also has a damaging effect on school atmosphere. In the context of the European project on Nature and Prevention of Bullying, this paper reviews recent findings on bullying at school, with (he aim of enhancing awareness of the issue and fostering interventions on both national and European basis. Considerations on definition and assessment of bullying are presented, age and sex differences are examined and the distinctive characteristics of bullies, victims and bully/victims are summarized. Furthermore the power of the school environment that tolerates or facilitates victimization is discussed and the basic principles and effects of .school based intervention programmes are described, It is concluded that, since, bullying in schools is widespread and the consequences can be severe and long-lasting, intervention strategies targeting towards a broader social context should be developed. Moreover, given the knowledge that, with a suitable intervention programme, it is definitely possible to reduce dramatically bully/victim problrms in school, we have a moral obligation to act on it.
description: Παιδαγωγική Επιθεώρηση, Vol. 34 (2002)
Traffic Behavior in Cloud Data Centers: A Survey
Creators: name: Alqahtani, Jarallah
name: Alanazi, Sultan
name: Hamdaoui, Bechir
Publisher: name: arXiv
Year: 2020
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Data centers (DCs) nowadays house tens of thousands of servers and switches, interconnected by high-speed communication links. With the rapid growth of cloud DCs, in both size and number, tremendous efforts have been undertaken to efficiently design the network and manage the traffic within these DCs. However, little effort has been made toward measuring, understanding and chattelizing how the network-level traffic of these DCs behave. In this paper, we aim to present a systematic taxonomy and survey of these DC studies. Specifically, our survey first decomposes DC network traffic behavior into two main stages, namely (1) data collection methodologies and (2) research findings, and then classifies and discusses the recent research studies in each stage. Finally, the survey highlights few research challenges related to DC network traffic that require further research investigation.
IGR J11215-5952: a hard X-ray transient displaying recurrent outbursts
Creators: name: Sidoli, L.
name: Paizis, A.
name: Mereghetti, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The hard X-ray source IGRJ11215-5952 has been discovered with INTEGRAL during a short outburst in 2005 and proposed as a new member of the class of supergiant fast X-ray transients. We analysed INTEGRAL public observations of the source field in order to search for previous outbursts from this transient, not reported in literature.Our results are based on a systematic re-analysis of INTEGRAL archival observations, using the latest analysis software and instrument calibrations. We report the discovery of two previously unnoticed outbursts, spaced by intervals of ~330 days, that occurred in July 2003 and May 2004. The 5-100keV spectrum is well described by a cut-off power law, with a photon index of 0.5, and a cut-off energy ~15-20keV, typical of High Mass X-ray Binaries hosting a neutron star. A 5-100keV luminosity of 3E36 erg/s has been derived (assuming 6.2kpc, the distance of the likely optical counterpart). The 5-100keV spectral properties, the recurrent nature of the outbursts,together with the reduced error region containing the blue supergiant star HD306414,support the hypothesis that IGRJ11215-5952 is a member of the class of the Supergiant Fast X-ray Transients.
description: 4 pages, 4 figures, accepted for publication in Astronomy and Astrophysics Letters
Measurement of open beauty production at HERA in the D* muon final state
Creators: name: ZEUS Collaboration
name: Chekanov, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The production of beauty quarks with a D*+- and a muon in the final state has been measured with the ZEUS detector at HERA using an integrated luminosity of 114 pb-1. Low transverse-momentum thresholds for the muon and D* meson allow a measurement of beauty production closer to the production threshold than previous measurements. The beauty signal was extracted using the charge correlations and angular distributions of the muon with respect to the D* meson. Cross sections for photoproduction and deep inelastic scattering are somewhat higher than, but compatible with, next-to-leading-order QCD predictions, and compatible with other measurements.
description: Second submission: 36 pages, 7 figures, 3 tables, minor revisions, accepted by European Physical Journal C
Two-photon fluorescence measurements of reversible photodegradation in a dye-doped polymer
Creators: name: Zhu, Ye
name: Zhou, Juefei
name: Kuzyk, Mark G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Optics (physics.optics)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We report on the dynamics of photodegradation and subsequent recovery of two-photon fluorescence in a dye-doped polymer. The energy dependence suggests that photo-degradation is a linear process while recovery is entropic. Such recovery could be useful to high-intensity devices such as two-photon absorbers, which can be used in many applications.
description: 3 pages, 4 figures
the role of KRAS in early recurrent ICC
Creators: name: xie, guoyun
Publisher: name: CNGB
Year: 2024
Subjects: Genome sequencing
Transcriptome or Gene expression
Multiisolate
Medical

description: intrahepatic cholangiocarcinoma(ICC) is one of main type of bile duct cancers. A total of 61 paired ICC tumours from Asian population were sequenced.
Επαγγελματικό άγχος εκαπιδευτικών και διευθυντών σχολείων: μια ποιοτική προσέγγιση
Creators: name: Τσιάκκιρος, Ανδρέας
name: Πασιαρδής, Πέτρος
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 2015

description: Παιδαγωγική Επιθεώρηση, Vol. 33 (2002)
Ultra-slow light pulses in a nonlinear metamaterial
Creators: name: D'Aguanno, Giuseppe
name: Mattiucci, Nadia
name: Bloemer, Mark J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We find the analytical expression for the threshold intensity necessary to launch ultra-slow light pulses in a metamaterial with simultaneous cubic electric and magnetic nonlinearity. The role played respectively by the permittivity, the permeability, the electric cubic nonlinearity, the magnetic cubic nonlinearity and the pulse duration is clearly identified and discussed.