cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Further constraints on white dwarf galactic halos
Creators: name: Canal, R.
name: Isern, J.
name: Ruiz-Lapuente, P.
Publisher: name: arXiv
Year: 1997
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The suggestion that roughly half the mass of the galactic halo might be in the form of white dwarfs, together with the limits on the infrared background light and on the initial metallicity of the galactic disk, would set strong constraints on the initial mass function (IMF) of the halo. Particular IMFs have been proposed to cut off both the numbers of low-mass stars contributing to the infrared background and of high-mass stars which contribute to the growth of metallicity when they promptly explode as gravitational-collapse (Type II and Type Ib/c) supernovae. Here we examine the further contribution to metallicity from the Type Ia (thermonuclear) supernovae which would later be produced from the halo white dwarf population. We find that, for most of the evolutionary scenarios for the Type Ia supernova progenitor systems proposed so far, the constraints on the white dwarf mass fraction in the halo from the predicted production of iron would be extremely severe. When the predicted iron excess is not so large, then the exceedingly high Type Ia supernova rate predicted for the present time would also exclude a major contribution of white dwarfs to the halo mass. The white dwarf contribution, in all cases, should be below 5-10%. Besides, for the IMFs considered, the duration of the halo burst should be shorter than 1 Gyr in order to avoid too large a spread in the iron abundances of Population II halo dwarfs, and the predicted halo $[O/Fe]$ ratio would be at odds with observations.
description: 16 pages, including 2 figures. AAS macros; to appear in ApJ (Letters), Oct. 1997
E_6 unification model building II. Clebsch-Gordan coefficients of 78$\otimes$78
Creators: name: Anderson, Gregory W.
name: Blazek, Tomas
Publisher: name: arXiv
Year: 2000
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We have computed the Clebsch-Gordan coefficients for the product (000001) $\otimes$ (000001), where (000001) is the adjoint 78-dimensional representation of $E_6$. The results are presented for the dominant weights of the irreducible representations in this product. As a simple application we express the singlet operator in $ 27 \otimes 78 \otimes \bar{27}$ in terms of multiplets of the Standard Model gauge group.
description: 27 pages, Latex
Heavy-ions collisions and fission dynamics with the time-dependent Hartree-Fock theory and its extensions
Creators: name: Simenel, C.
name: Umar, A. S.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Microscopic methods and tools to describe nuclear dynamics have considerably been improved in the past few years. They are based on the time-dependent Hartree-Fock (TDHF) theory and its extensions to include pairing correlations and quantum fluctuations. The TDHF theory is the lowest level of approximation of a range of methods to solve the quantum many-body problem, showing its universality to describe many-fermion dynamics at the mean-field level. The range of applications of TDHF to describe realistic systems allowing for detailed comparisons with experiment has considerably increased. For instance, TDHF is now commonly used to investigate fusion, multi-nucleon transfer and quasi-fission reactions. Thanks to the inclusion of pairing correlations, it has also recently led to breakthroughs in our description of the saddle to scission evolution, and, in particular, the non-adiabatic effects near scission. Beyond mean-field approaches such as the time-dependent random-phase approximation (TDRPA) and stochastic mean-field methods have reached the point where they can be used for realistic applications. We review recent progresses in both techniques and applications to heavy-ion collision and fission.
description: Review article. 80 pages, 30 figures. Accepted for publication in Prog. Part. Nucl. Phys. Some typos corrected and references updated
Το ChatGPT υπό το φως του Γενικού Κανονισμού Προστασίας Προσωπικών Δεδομένων
Creators: name: Κοργιαλά, Όλγα
Publisher: name: Επιθεώρηση Δικαίου Πληροφορικής
Year: 2024

description: Στην παρούσα μελέτη εξετάζεται το ζήτημα κατά πόσο ένα μοντέλο τεχνητής νοημοσύνης, όπως το ChatGPT, συμβαδίζει με τον Γενικό Κανονισμό Προστασίας Προσωπικών Δεδομένων (GDPR). Η δημιουργία ενός νομοθετικού πλαισίου για την αντιμετώπιση των εγγενών κινδύνων κρίνεται ως ύψιστης σημασίας. Ορόσημο αποτελεί η συμφωνία της 9ης Δεκεμβρίου 2023,  για την τεχνητή νοημοσύνη θέτοντας την Ευρώπη να διαδραματίσει έναν ηγετικό ρόλο παγκοσμίως. Για την αποτελεσματική προστασία των προσωπικών δεδομένων, πρέπει να γίνει κατανοητός ο τρόπος λειτουργίας του ChatGPT  καθώς και ο τρόπος επεξεργασίας των προσωπικών δεδομένων από αυτό.

Η λήψη των κατάλληλων μέτρων για τη συνετή λειτουργία του ChatGPT όχι μόνο θα προστατεύσει το υποκείμενο των δεδομένων από την παράνομη επεξεργασία των προσωπικών του δεδομένων, αλλά θα καταπολεμήσει τις προκαταλήψεις, την κοινωνική διάκριση και την παραπληροφόρηση. Το άρθρο ολοκληρώνεται με μία σύντομη περιγραφή περιπτωσιολογίας σχετικά με την στάση των χωρών εντός και εκτός Ευρώπης αλλά και των μεγάλων επιχειρήσεων απέναντι στο ChatGPT.
description: Επιθεώρηση Δικαίου Πληροφορικής, Τόμ. 4, Αρ. 2 (2023)
Search for pair-produced resonances decaying to quark pairs in proton-proton collisions at $\sqrt{s} =$ 13 TeV
Creators: name: CMS Collaboration
Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: A general search for the pair production of resonances, each decaying to two quarks, is reported. The search is conducted separately for heavier resonances (masses above 400 GeV), where each of the four final-state quarks generates a hadronic jet resulting in a four-jet signature, and for lighter resonances (masses between 80 and 400 GeV), where the pair of quarks from each resonance is collimated and reconstructed as a single jet resulting in a two-jet signature. In addition, a b-tagged selection is applied to target resonances with a bottom quark in the final state. The analysis uses data collected with the CMS detector at the CERN LHC, corresponding to an integrated luminosity of 35.9 fb$^{-1}$, from proton-proton collisions at a center-of-mass energy of 13 TeV. The mass spectra are analyzed for the presence of new resonances, and are found to be consistent with standard model expectations. The results are interpreted in the framework of $R$-parity-violating supersymmetry assuming the pair production of scalar top quarks decaying via the hadronic coupling $λ_{312}''$ or $λ_{323}''$, and upper limits on the cross section as a function of the top squark mass are set. These results probe a wider range of masses than previously explored at the LHC, and extend the top squark mass limits in the $\widetilde{\mathrm{t}}$ $\to$ qq$'$ scenario.
description: Replaced with the published version. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/EXO-17-021 (CMS Public Pages)
Additional file 1: of RIVA â a phase IIa study of rituximab and varlilumab in relapsed or refractory B-cell malignancies: study protocol for a randomized controlled trial
Creators: name: Lim, Sean
name: Linton, Kim
name: Collins, Graham
name: Dhondt, Joke
name: Caddy, Joshua
name: Rossiter, Liz
name: Vadher, Karan
name: Fines, Keira
name: Rogers, Laura
name: Fernando, Diana
name: Stanton, Louise
name: Davies, Andrew
name: Johnson, Peter
name: Griffiths, Gareth
Publisher: name: figshare
Year: 2018
Subjects: subject: Space Science
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences

description: Detailed information on RIVA dose modification and management of infusion-related reactions. This guidance is to be used if a patient experiences peri-infusional reactions. (PDF 88 kb)
Limenitis camilla
Creators: name: Bonelli, Simona
name: Barbero, Francesca
name: Casacci, Luca Pietro
name: Cerrato, Cristiana
name: Balletto, Emilio
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Nymphalidae
Limenitis
Limenitis camilla

description: Limenitis camilla (Linnaeus, 1764)
Papilio camilla Linnaeus, 1764: 304.
FIRST RECORD FOR THE VALDIERI AREA. — Cassulo L. 2001 pers. coll. (Andonno, 900 m).
CHOROTYPE. — European; NE China and Amur to Japan (disjunct).
ECOLOGY. — Nemoral, lowland-lower montane, mesophilous, mesophilous.
EDIT PROJECT SAMPLING. — Not found.
description: Published as part of Bonelli, Simona, Barbero, Francesca, Casacci, Luca Pietro, Cerrato, Cristiana & Balletto, Emilio, 2015, The butterfly fauna of the Italian Maritime Alps: results of the EDIT project, pp. 139-167 in Zoosystema 37 (1) on page 158, DOI: 10.5252/z2015n1a6, http://zenodo.org/record/5154896
Black Holes and Five-brane Thermodynamics
Creators: name: Martinec, E.
name: Sahakian, V.
Publisher: name: arXiv
Year: 1999
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The phase diagram for Dp-branes in M-theory compactified on $T^4$, $T^4/Z_2$, $T^5$, and $T^6$ is constructed. As for the lower-dimensional tori considered in our previous work (hep-th/9810224), the black brane phase at high entropy connects onto matrix theory at low entropy; we thus recover all known instances of matrix theory as consequences of the Maldacena conjecture. The difficulties that arise for $T^6$ are reviewed. We also analyze the D1-D5 system on $T^5$; we exhibit its relation to matrix models of M5-branes, and use spectral flow as a tool to investigate the dependence of the phase structure on angular momentum.
description: 57 pages, 6 eps figures, latex. v2: DLCQ limit of 5-brane corrected; typos corrected, references added. v3: reference added, typos corrected v4: comments on DLCQ limit of 5-brane corrected one last time. Final version, to appear in Phys. Rev. D
Powering Anomalous X-ray Pulsars by Neutron Star Cooling
Creators: name: Heyl, Jeremy S.
name: Hernquist, Lars
Publisher: name: arXiv
Year: 1997
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Using recently calculated analytic models for the thermal structure of ultramagnetized neutron stars, we estimate the thermal fluxes from young ($t\sim 1000$ yr) ultramagnetized ($B \sim 10^{15}$ G) cooling neutron stars. We find that the pulsed X-ray emission from objects such as 1E 1841-045 and 1E 2259+586 as well as many soft-gamma repeaters can be explained by photon cooling if the neutron star possesses a thin insulating envelope of matter of low atomic weight at densities $ρ< 10^{7}-10^{8}$ g/cm$^3$. The total mass of this insulating layer is $M \sim 10^{-11}-10^{-8} M_\odot$.
description: 8 pages, 1 figure, to appear in Ap.J. Letters (one reference entry corrected, no other changes)
Η σύγκρουση μεταξύ της προστασίας δεδομένων και της ανάγκης πρόληψης της χρησιμοποίησης του χρηματοπιστωτικού συστήματος για τη νομιμοποίηση εσόδων από παράνομες δραστηριότητες ή για τη χρηματοδότηση της τρομοκρατίας
Creators: name: Γιαννακίδου, Χριστίνα
Publisher: name: Επιθεώρηση Δικαίου Πληροφορικής
Year: 2024

description: Στο πλαίσιο της παρούσας μελέτης επιχειρείται να ανιχνευθεί, στο πλαίσιο της Οδηγίας  2015/849, η εφαρμογή των αρχών για την επεξεργασία προσωπικών δεδομένων, οι νομικές βάσεις επεξεργασίας των προσωπικών δεδομένων και τα δικαιώματα των υποκειμένων των δεδομένων. Παράλληλα, παρατίθενται τα ευρήματα από την έρευνα στη νομολογία του ΔΕΕ που έχει διαμορφωθεί επί των ως άνω ζητημάτων και χρήσιμα συμπεράσματα.
description: Επιθεώρηση Δικαίου Πληροφορικής, Τόμ. 4, Αρ. 2 (2023)
A Tale of Two Metals: contrasting criticalities in the pnictides and hole-doped cuprates
Creators: name: Hussey, N. E.
name: Buhot, J.
name: Licciardello, S.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The iron-based high temperature superconductors share a number of similarities with their copper-based counterparts, such as reduced dimensionality, proximity to states of competing order, and a critical role for 3d electron orbitals. Their respective temperature-doping phase diagrams also contain certain commonalities that have led to claims that the metallic and superconducting properties of both families are governed by their proximity to a quantum critical point (QCP) located inside the superconducting dome. In this review, we critically examine these claims and highlight significant differences in the bulk physical properties of both systems. While there is now a large body of evidence supporting the presence of a (magnetic) QCP in the iron pnictides, the situation in the cuprates is much less apparent, at least for the end point of the pseudogap phase. We argue that the opening of the normal state pseudogap in cuprates, so often tied to a putative QCP, arises from a momentum-dependent breakdown of quasiparticle coherence that sets in at much higher doping levels but which is driven by the proximity to the Mott insulating state at half filling. Finally, we present a new scenario for the cuprates in which this loss of quasiparticle integrity and its evolution with momentum, temperature and doping plays a key role in shaping the resultant phase diagram.
description: This key issues review is dedicated to the memory of Dr. John Loram whose pioneering measurements, analysis and ideas inspired much of its content
Additional file 3: of The effect of model selection on cost-effectiveness research: a comparison of kidney function-based microsimulation and disease grade-based microsimulation in chronic kidney disease modeling
Creators: name: Shusuke Hiragi
name: Tamura, Hiroshi
name: Goto, Rei
name: Kuroda, Tomohiro
Publisher: name: figshare
Year: 2018
Subjects: subject: Medicine
subject: Genetics
subject: FOS: Biological sciences
subject: Biotechnology
subject: Ecology
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics
subject: Marine Biology
subject: Science Policy
subject: Plant Biology

description: Figure S2. Supplementary documents describing parameter determination in detail. (DOC 128 kb)
Satyrus ferula
Creators: name: Bonelli, Simona
name: Barbero, Francesca
name: Casacci, Luca Pietro
name: Cerrato, Cristiana
name: Balletto, Emilio
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Nymphalidae
Satyrus
Satyrus ferula

description: Satyrus ferula (Fabricius, 1793)
Papilio ferula Fabricius, 1793: 225.
FIRST RECORD FOR THE VALDIERI AREA. — Turati & Verity (1911).
CHOROTYPE. — Centralasiatic-European, Northwest Africa.
ECOLOGY. — Subnemoral, lower-upper montane, thermophilous, xerophilous.
EDIT PROJECT SAMPLING. — Natural reserve Juniperus phoenicea, dry grassland 878 m, VII.2008; Fishing reserve Cappello di Napoleone, Beech-wood clearings, 1300 m, VII-VIII.2009; Valasco, Rhododendron heathland, 1690 m, VII-VIII.2009; Valasco, Hygrophilous grassland 1750 m, VII-VIII.2009; Valasco, Juniperus heathland/ grassland, 1790 m, VII.2009, CS.
description: Published as part of Bonelli, Simona, Barbero, Francesca, Casacci, Luca Pietro, Cerrato, Cristiana & Balletto, Emilio, 2015, The butterfly fauna of the Italian Maritime Alps: results of the EDIT project, pp. 139-167 in Zoosystema 37 (1) on page 158, DOI: 10.5252/z2015n1a6, http://zenodo.org/record/5154896
Renormalon contributions to δρ
Creators: name: Gambino, Paolo
name: Sirlin, Alberto
Publisher: name: arXiv
Year: 1995
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Leading QCD vacuum polarization contributions to the electroweak parameter $δρ$ are evaluated numerically using several different prescriptions for the gluon self-energy. Simple theoretical estimates of the asymptotic behavior are given. The results show a significant contribution from the leading infrared renormalons when $δρ$ is expressed in terms of the top-quark pole mass and its absence when the $\msbar$ running mass is employed. The calculations are applied to estimate higher order QCD contributions to $δρ$.
description: 9 pages, plain latex
Behavioural targeting (Συμπεριφορική στόχευση) και δίκαιο προστασίας δεδομένων στην έννομη τάξη της ΕΕ
Creators: name: Τορτόκα, Όλγα
Publisher: name: Επιθεώρηση Δικαίου Πληροφορικής
Year: 2024

description: Στη μελέτη αυτή παρουσιάζεται το φαινόμενο της συμπεριφορικής στόχευσης, όπως γίνεται αντιληπτή στο πλαίσιο του δικαίου της Ευρωπαϊκής Ένωσης, η οποία αναφέρεται στην πρακτική της παρακολούθησης και ανάλυσης της διαδικτυακής συμπεριφοράς, των προτιμήσεων και των δραστηριοτήτων των ατόμων με σκοπό την παροχή εξατομικευμένου περιεχομένου, διαφημίσεων ή προσφορών σε αυτά.
description: Επιθεώρηση Δικαίου Πληροφορικής, Τόμ. 4, Αρ. 2 (2023)
Slow train coming. AI Act: ακόμη ένα μετέωρο βήμα προς την ψηφιακή συνταγματοποίηση της Ευρώπης και το Brussels Effect
Creators: name: Πώποτας, Κώστας
Publisher: name: Επιθεώρηση Δικαίου Πληροφορικής
Year: 2024

description: Η πρόταση της Επιτροπής του Απριλίου 2021, για έναν Κανονισμό σχετικό με την ρύθμιση της Τεχνητής Νοημοσύνης, γνωστή ως Πράξη Τεχνητής Νοημοσύνης, της οποίας η ψήφιση αναμένεται πριν τις εκλογές του Ευρωπαϊκού Κοινοβουλίου, συγκεντρώνει την προσοχή σημαντικού κύκλου ενδιαφερομένων λόγω του δυναμισμού του αντικειμένου της. Η πρόταση ΠΤΝ σηματοδότησε μια σημαντική μεταστροφή της Ευρωπαϊκής προσέγγισης από την εθελοντική αυτορρύθμιση βάσει ηθικών κανόνων, προς την νομοθετική ρύθμιση γενικής και άμεσης εφαρμογής στην Επικράτεια της ΕΕ, με χαρακτήρα εκτελεστότητας και επιβολή κυρώσεων, και σαφή φιλοδοξία  να επιβεβαιώσει το “Brussels Effect”, να είναι το πρώτο σχετικό νομοθέτημα παγκοσμίως και να επηρεάσει την ανάπτυξη παγκόσμιων κανόνων και αρχών για την τεχνητή νοημοσύνη,  κατά το πρότυπο του Γενικού Κανονισμού Προστασίας Προσωπικών Δεδομένων από τον οποίο αντλεί πολλά στοιχεία, χωρίς εντούτοις να στραγγαλίσει την καινοτομία εντός της ΕΕ. Η μέθοδος που προκρίθηκε για την ρύθμιση των χρήσεων Τεχνητής Νοημοσύνης, περιλαμβανομένων των «παραγωγικών» λεγόμενων συστημάτων, είναι αυτή της διαβαθμισμένης ταξινόμησης και αντιμετώπισής τους βάσει της προκαταβολικής αξιολόγησης κινδύνου επιπτώσεων στα θεμελιώδη δικαιώματα, με απαίτηση συμμόρφωσης προκειμένου τα συστήματα ΤΝ να γίνουν δεκτά  στην εσωτερική αγορά της ΕΕ.  Η απαγόρευση κακόβουλων και καταχρηστικών, απαράδεκτων πρακτικών, ακολουθείται από την συστηματική παρακολούθηση χρήσεων υψηλού κινδύνου, και την ελαστικότερη αντιμετώπιση εφαρμογών χαμηλού κινδύνου, σε ένα πλαίσιο διακυβέρνησης με συνεργασία Ευρωπαϊκών αρχών και Κρατών Μελών και συμμόρφωσης των φορέων εγκατάστασης λύσεων τεχνητής νοημοσύνης. Η προσδοκία όλων είναι ότι οι προκλήσεις της Τεχνητής Νοημοσύνης θα παρακολουθούνται δυναμικά και έγκαιρα από το οικοσύστημα που η ΕΕ θα εγκαταστήσει ώστε να τηρούνται οι εγγυήσεις λειτουργίας ανθρωποκεντρικής και αξιόπιστης τεχνητής νοημοσύνης με σεβασμό του κράτους δικαίου και των Ενωσιακών ελευθεριών, ότι η απαιτούμενη οργανωτική προεργασία θα ολοκληρωθεί έγκαιρα και ότι οι ατέλειες και τα κενά της ρύθμισης θα καλυφθούν ερμηνευτικά ή μέσω των κατ’ εξουσιοδότηση πράξεων της Επιτροπής.
description: Επιθεώρηση Δικαίου Πληροφορικής, Τόμ. 4, Αρ. 2 (2023)
Radial velocity follow-up of GJ1132 with HARPS. A precise mass for planet 'b' and the discovery of a second planet
Creators: name: Bonfils, X.
name: Almenara, J. -M.
name: Cloutier, R.
name: Wünsche, A.
name: Astudillo-Defru, N.
name: Berta-Thompson, Z.
name: Bouchy, F.
name: Charbonneau, D.
name: Delfosse, X.
name: Díaz, R. F.
name: Dittmann, J.
name: Doyon, R.
name: Forveille, T.
name: Irwin, J.
name: Lovis, C.
name: Mayor, M.
name: Menou, K.
name: Murgas, F.
name: Newton, E.
name: Pepe, F.
name: Santos, N. C.
name: Udry, S.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: GJ1132 is a nearby red dwarf known to host a transiting Earth-size planet. After its initial detection, we pursued an intense follow-up with the HARPS velocimeter. We now confirm the detection of GJ1132b with radial velocities only. We refined its orbital parameters and, in particular, its mass ($m_b = 1.66\pm0.23 M_\oplus$), density ($ρ_b = 6.3\pm1.3$ g.cm$^{-3}$) and eccentricity ($e_b < 0.22 $; 95\%). We also detect at least one more planet in the system. GJ1132c is a super-Earth with period $P_c = 8.93\pm0.01$ days and minimum mass $m_c \sin i_c = 2.64\pm0.44~M_\oplus$. Receiving about 1.9 times more flux than Earth in our solar system, its equilibrium temperature is that of a temperate planet ($T_{eq}=230-300$ K for albedos $A=0.75-0.00$) and places GJ1132c near the inner edge of the so-called habitable zone. Despite an a priori favourable orientation for the system, $Spitzer$ observations reject most transit configurations, leaving a posterior probability $<1\%$ that GJ1132c transits. GJ1132(d) is a third signal with period $P_d = 177\pm5$ days attributed to either a planet candidate with minimum mass $m_d \sin i_d = 8.4^{+1.7}_{-2.5}~M_\oplus$ or stellar activity. (abridged)
description: accepted in Astronomy and Astrophysics
title: Growth rates in the whiting catch of the N.W Irish Sea, 1959-1960
Creators: name: Hillas, J. P.
Publisher: name: ASC 1960
Year: 2024
Subjects: Celtic Seas (ICES Ecoregion)
Fisheries and aquaculture

description: Whiting, Gadus merlangus L, are caught round the coast of Ireland, mainly by boats of about 50 ft. (15 m) length, using Danish seine nets. The fisheries suitable for study are those in N. W. Irish Sea, at 15-40 fathoms, between the latitudes of Dublin and Dundrum Bay, at the main centres shown below:
Howth: about 16 boats,Skerries and Loughshinny: about 8 boats,Balbriggan: about 8 boats,Clogherhead: about 8 boats.Boats from Kilkeel, Northern Ireland , are also generally fishing the same grounds.
Minois dryas
Creators: name: Bonelli, Simona
name: Barbero, Francesca
name: Casacci, Luca Pietro
name: Cerrato, Cristiana
name: Balletto, Emilio
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Nymphalidae
Minois
Minois dryas

description: Minois dryas (Scopoli, 1763)
Papilio dryas Scopoli, 1763: 153.
NEW RECORD. — First record in this article.
CHOROTYPE. — Asiatic-European.
ECOLOGY. — Subnemoral, lowland-upper montane, mesophilous/ thermophilous, mesophilous/xerophilous.
EDIT PROJECT SAMPLING. — Natural reserve Juniperus phoenicea, dry grassland 878 m, VIII.2008, CS.
description: Published as part of Bonelli, Simona, Barbero, Francesca, Casacci, Luca Pietro, Cerrato, Cristiana & Balletto, Emilio, 2015, The butterfly fauna of the Italian Maritime Alps: results of the EDIT project, pp. 139-167 in Zoosystema 37 (1) on page 158, DOI: 10.5252/z2015n1a6, http://zenodo.org/record/5154896
title: Ð Ð°Ð·ÑÐ°Ð±Ð¾ÑÐºÐ° ÑÐ»ÐµÐºÑÑÐ¾Ð¿ÑÐ¸Ð²Ð¾Ð´Ð° ÑÐµÐ½ÑÑÐ¾Ð±ÐµÐ¶Ð½Ð¾Ð³Ð¾ Ð½Ð°ÑÐ¾ÑÐ° Ð´Ð»Ñ Ð¿ÐµÑÐµÐºÐ°ÑÐ¸Ð²Ð°Ð½Ð¸Ñ Ð½ÐµÑÑÐµÐ¿ÑÐ¾Ð´ÑÐºÑÐ¾Ð² Ð½Ð° Ð¾ÑÐ½Ð¾Ð²Ðµ Ð°ÑÐ¸Ð½Ñ ÑÐ¾Ð½Ð½Ð¾Ð³Ð¾ Ð´Ð²Ð¸Ð³Ð°ÑÐµÐ»Ñ Ð¼Ð¾ÑÐ½Ð¾ÑÑÑÑ 90 ÐºÐÑ
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¼Ð°Ð³Ð¸ÑÑÑÐ°
titleType: Subtitle
title: Development of an electric drive for a centrifugal pump for pumping petroleum products based on an asynchronous motor with a power of 90 kW
Creators: name: Ð¡Ð°Ð³Ð°Ð´ÐµÐµÐ², ÐÐ¸ÐºÐ¸ÑÐ°
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2024
Subjects: ÐÐ°ÑÐ¾ÑÑ ÑÐµÐ½ÑÑÐ¾Ð±ÐµÐ¶Ð½ÑÐµ
Ð­Ð»ÐµÐºÑÑÐ¸ÑÐµÑÐºÐ¸Ðµ Ð¿ÑÐ¸Ð²Ð¾Ð´Ñ
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Ð°ÑÐ¸Ð½Ñ ÑÐ¾Ð½Ð½ÑÐ¹ Ð´Ð²Ð¸Ð³Ð°ÑÐµÐ»Ñ
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asynchtonous motor
automated construction system

description: ÐÐ»Ñ Ð´Ð¾ÑÑÐ¸Ð¶ÐµÐ½Ð¸Ñ ÑÐµÐ»Ð¸ Ð±ÑÐ»Ð¸ Ð¿Ð¾ÑÑÐ°Ð²Ð»ÐµÐ½Ñ ÑÐ»ÐµÐ´ÑÑÑÐ¸Ðµ Ð·Ð°Ð´Ð°ÑÐ¸: ÐÐ½Ð°Ð»Ð¸Ð· ÑÐ°Ð±Ð¾ÑÑ ÑÐµÐ½ÑÑÐ¾Ð±ÐµÐ¶Ð½ÑÑ Ð½Ð°ÑÐ¾ÑÐ¾Ð²; ÐÑÐ±Ð¾Ñ ÑÐ»ÐµÐºÑÑÐ¸ÑÐµÑÐºÐ¾Ð³Ð¾ Ð¿ÑÐ¸Ð²Ð¾Ð´Ð°; Ð Ð°ÑÑÑÑ Ð¿Ð°ÑÐ°Ð¼ÐµÑÑÐ¾Ð² Ð¢-Ð¾Ð±ÑÐ°Ð·Ð½Ð¾Ð¹ ÑÑÐµÐ¼Ñ Ð·Ð°Ð¼ÐµÑÐµÐ½Ð¸Ñ; Ð Ð°ÑÑÑÑ Ð¸ Ð²ÑÐ±Ð¾Ñ ÑÐ¾ÑÐ¼Ð¾Ð·Ð½Ð¾Ð³Ð¾ ÑÐµÐ·Ð¸ÑÑÐ¾ÑÐ°; Ð¡Ð¾Ð·Ð´Ð°Ð½Ð¸Ðµ Ð¿ÑÐ¾Ð³ÑÐ°Ð¼Ð¼Ð½Ð¾Ð¹ Ð¼Ð¾Ð´ÐµÐ»Ð¸ Ð² Ð¿ÑÐ¾Ð³ÑÐ°Ð¼Ð¼Ðµ MATLAB Simulink; ÐÑÐ¾Ð²ÐµÑÑÐ¸ Ð¸ÑÐ¿ÑÑÐ°Ð½Ð¸Ñ ÑÐ°Ð±Ð¾ÑÑ Ð² ÑÐ°Ð·Ð»Ð¸ÑÐ½ÑÑ ÑÐµÐ¶Ð¸Ð¼Ð°Ñ; ÐÑÐ¾Ð°Ð½Ð°Ð»Ð¸Ð·Ð¸ÑÐ¾Ð²Ð°ÑÑ Ð¿Ð¾Ð»ÑÑÐµÐ½Ð½ÑÐµ ÑÐµÐ·ÑÐ»ÑÑÐ°ÑÑ.
description: To achieve the goal, the following tasks were set: Analysis of the operation of centrifugal pumps; Selection of electric drive; Calculation of T-shaped equivalent circuit parameters; Calculation and selection of braking resistor; Creating a software model in MATLAB Simulink; Test operation in various modes; Analyze the results obtained.
Hydro-morphodynamics of open-channel confluences with low discharge ratio and dominant tributary sediment supply
Creators: name: Guillén Ludeña, Sebastián
Publisher: name: Lausanne, EPFL - LCH
Year: 2015

description: River confluences are not only hot spots of diversity but also main elements for the connectivity in water catchments. In the past century many of the Alpine rivers in Europe as well as their tributaries have been channelized. Especially the confluences have often been transferred to rigid channels. Even sills were installed between the tributary and the main river. The result is that the connectivity of the river system was severely interrupted. In order to restore these confluences, its hydro-morphosedimentary processes have to be known. Alpine confluences have steep tributaries with a high supply of coarse sediment, which strongly influences the hydro-morpho-sedimentary processes. They differ fundamentally from existing conceptual models of confluence dynamics mainly developed on lowland river confluences. In his research project Mr. Dr. Sebastian Guillen conducted for the first time a systematic experimental study on hydro-morphodynamic processes in alpine confluences with simultaneous sediment supply in the tributary and in the main channel. The candidate studied systematically the influence of two junction angles, namely 90° and 70°, as well as two different grain size distributions, with high and low gradation coefficients and the same median diameter. It could be observed that with continuous sediment supply into the main channel, deeper scour along the bank-attached bar was observed since the armouring of the bed was not easily possible. Dr. Guillen could also highlight that increasing discharge ratios produce deeper scour at the tributary mouth. With non-uniform sediments, the size of the bank-attached bar decreased with increasing discharge ratio. On the other hand the bank-attached bar was larger with increasing discharge ratio when uniform sediments were used in the tests. Furthermore Dr. Guillen demonstrated that lower junction angle (α = 70°) facilitates the penetration of the tributary-mouth bar and the delivery of tributary sediment load into the main channel. This deeper penetration of the tributary-mouth bar with α = 70° reduced the erosion at the tributary mouth and enlarged the bank-attached bar compared to α = 90°. When using uniform sediments in the experiments it could be also shown that the bankattached bar and the scour hole are strongly under-reproduced as compared to natural confluences, where a wide grain size distribution is normally predominant.
Lasing Effect in Symmetrical van der Waals Heterostructured Metasurfaces Due to Lattice-Induced Multipole Coupling
Creators: name: Prokhorov, Alexei V.
name: Gubin, Mikhail Yu.
name: Shesterikov, Alexander V.
name: Arsenin, Aleksey V.
name: Volkov, Valentyn S.
name: Evlyukhin, Andrey B.
Publisher: name: Washington, DC : ACS Publ.
Year: 2023
Subjects: subject: laser rate equations
subject: lasing effect
subject: Mie resonances
subject: octupole quasi-trapped modes
subject: van der Waals heterostructured metasurfaces
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie
subject: Dewey Decimal Classification::600 | Technik::660 | Technische Chemie

description: New practical ways to reach the lasing effect in symmetrical metasurfaces have been developed and theoretically demonstrated. Our approach is based on excitation of the resonance of an octupole quasi-trapped mode (OQTM) in heterostructured symmetrical metasurfaces composed of monolithic disk-shaped van der Waals meta-atoms featured by thin photoluminescent layers and placed on a substrate. We revealed that the coincidence of the photoluminescence spectrum maximum of these layers with the wavelength of high-quality OQTM resonance leads to the lasing effect. Based on the solution of laser rate equations and direct full-wave simulation, it was shown that lasing is normally oriented to the metasurface plane and occurs from the entire area of metasurface consisting of MoS2/hBN/MoTe2 disks with line width of generated emission of only about 1.4 nm near the wavelength 1140 nm. This opens up new practical possibilities for creating surface emitting laser devices in subwavelength material systems.
Additional file 2: of Chronic pulmonary exposure to traffic-related fine particulate matter causes brain impairment in adult rats
Creators: name: Chi-Hsiang Shih
name: Jen-Kun Chen
name: Kuo, Li-Wei
name: Kuan-Hung Cho
name: Ta-Chih Hsiao
name: Zhe-Wei Lin
name: Yi-Syuan Lin
name: Jiunn-Horng Kang
name: Lo, Yu-Chun
name: Kai-Jen Chuang
name: Tsun-Jen Cheng
name: Hsiao-Chi Chuang
Publisher: name: figshare
Year: 2018
Subjects: subject: Medicine
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology

description: Table S1. Meteorological and gaseous data measured by the traffic-related EPA Yonghe air quality monitoring stations during the study period. Table S2. Instruments used to characterize the exposure conditions for rats. Figure S2. Characterization of particle size and penetration distribution (between outdoor and whole-body exposure system) determined using a scanning mobility particle sizer (SMPS, TSI 3936; upper size limit: 710 nm). (a) The exposure cages (yellow marked: 1–1, 1–3, 1–5, 2–3, 3–1, 3–3 and 3–5) were measured for size-penetration distribution. (b) The individual cage for animal exposure showed a consistent size-penetration distribution. The geometric mean diameter (GMD) was 50 nm. (DOCX 152 kb)
AdS_2 and quantum stability in the CGHS model
Creators: name: Kim, Won Tae
Publisher: name: arXiv
Year: 1998
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The two-dimensional anti-de Sitter space(AdS_2) is constructed in terms of the CGHS model. The geometric solutions are composed of the AdS vacuum and the AdS black hole which are locally equivalent but distinguishable by their mass. The infalling classical fields do not play any role but the quantum back reaction is crucial in the formation of the AdS vacuum and AdS black hole. In the presence of the AdS black hole, there does not exist any radiation, which is consistent with the constraint equations. Therefore the transition from the AdS black hole to the AdS vacuum is impossible, and they are quantum mechanically stable . We discuss the reason why the vanishing Hawking radiation appears in the AdS_2 black hole in contrast to asymptotically flat black holes.
description: 14 pages, revtex, no figures, some eqs. are corrected and discussion is added. To appear in Phys. Rev. D
Edge and bulk localization of Floquet topological superconductors
Creators: name: Cadez, Tilen
name: Mondaini, Rubem
name: Sacramento, Pedro D.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study the bulk and edge properties of a driven Kitaev chain, where the driving is performed as instantaneous quenches of the on-site energies. We identify three periodic driving regimes: low period, which is equivalent to a static model, with renormalized parameters obtained from the Baker-Campbell-Hausdorff (BCH) expansion; intermediate period, where the first order BCH expansion breaks down; and high period when the quasienergy gap at $ω/2$ closes. We investigate the dynamical localization properties for the case of quasiperiodic potential driving as a function of its amplitude and the pairing strength, obtaining regimes with extended, critical and localized bulk states, if the driving is performed at high frequencies. In these, we characterize wave-packet propagation, obtaining ballistic, subdiffusive and absence of spreading, respectively. In the intermediate period regime, we find an additional region in the phase diagram with a mobility edge between critical and localized states. Further, we investigate the stability of these phases under time-aperiodicity on the drivings, observing that the system eventually thermalizes: It results in featureless random states which can be described by the symmetry of the Hamiltonian. In a system with open edges, we find that both Majorana and fermionic localized edge modes can be engineered with a spatially quasiperiodic potential. Besides, we demonstrate the possibility of creating multiple Majorana $0$ and $π$ modes in a driven setting, even if the underlying static Hamiltonian is in its trivial phase. Lastly, we study the robustness of the Majorana modes against the aperiodicity in the driving period, showing that the ones created via quasiperiodic potential are more robust to the decoherence. Moreover, we find an example where Majorana mode is robust, provided that it is chosen from a special point in the topological region.
description: 11+1 pages, 11+1 figures
D0-D8-F1 in Massive IIA SUGRA
Creators: name: Massar, M.
name: Troost, J.
Publisher: name: arXiv
Year: 1999
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present some new supersymmetric solutions of massive IIA supergravity involving D0-branes, a D8-brane and a string. For the bosonic fields we use a general ansatz with SO(8) symmetry.
description: 7 pages, reference added, appendix included in main text
Multiple Tab-and-Slot Joint : Improvement of the Rotational Stiffness for the Connection of Thin Structural Wood Panels
Creators: name: Roche, Stéphane
name: Gamerro, Julien
name: Weinand, Yves
Publisher: name: World Conference on Timber Engineering, Vienna
Year: 2016

description: Researchers in Asia have focused on analyzing the rotational performance of traditional connections based on embedment. The Nuki through-joint has inspired work at the laboratory of wood construction (IBOIS), Ecole Polytechnique Fédérale de Lausanne, to improve the rotational behavior of the multiple tab and slot joint (MTSJ). In this work, through tenon (TT) and closed slot joints were added to initial dovetail and Nejiri arigata joints used for foldedplate structures. The bending performance of the improved MTSJ-TT joint was higher than that of screwed angular connections. Numerical monitoring of the embedded volumes under partial compression on the contact surfaces was used to characterize the directly and indirectly loaded areas. The decay coefficients for the exponential form, which defined the additional length in the indirectly loaded area, were quantified for both single (SC) and double contact (DC). The evolution of these coefficients was also monitored along the angular deformation. Finally, an analytical formulation of the embedded volumes was provided to prepare an analytical model for the MTSJ-TT joint subjected to bending.
Detection of the 2175 angstrom dust feature in Mg II absorption systems
Creators: name: Malhotra, Sangeeta
Publisher: name: arXiv
Year: 1997
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The broad absorption bump at 2175 angstrom due to dust, which is ubiquitous in the Galaxy and is seen in the Magellanic clouds, is also seen in a composite spectrum of Mg II absorbers. The composite absorber spectrum is obtained by taking the geometric mean of 92 quasar spectra after aligning them in the restframe of 96 absorbers. By aligning the spectra according to absorber redshifts we reinforce the spectral features of the absorbers, and smooth over possible bumps and wiggles in the emission spectra as well as small features in the flat fielding of the spectra. The width of the observed absorption feature is 200-300 angstrom (FWHM), or 0.4-0.6 (micron)^{-1} and the central wavelength is 2240 angstrom. These are somewhat different from the central wavelength of 2176 angstrqom and FWHM=0.8-1.25 (micron)^{-1} found in the Galaxy. Simulations show that this discrepancy between the properties of the 2175 angstrom feature in Mg II absorbers and Galactic ISM can be mostly explained by the different methods used to measure them.
description: To appear in ApJ(letters). 11 pages, Latex, uses AASTeX v4.0
Social accountability in medical education: A bibliometric analysis
Creators: name: Abdalla, Mohamed
name: Onchonga, David
name: Taha, Mohamed Hassan
Publisher: name: University of Limerick
Year: 2024
Subjects: classificationCode: 42
subject: Health sciences
subject: FOS: Health sciences

description: Social accountability (SA) in medical education is the obligation to direct health professionals’ education to address the priority health needs of communities. Despite the extensive SA-related literature, trends in its prevalence and scope remain unexplained. This study aimed to analyse trends in SA in medical education publications, information clusters and any paucity in integrating SA into medical education. The PubMed and Scopus databases were searched for publications from 1995 to 2023 without language restrictions. VOSviewer was used to conduct the bibliometric analysis. This study retrieved 1,292 articles on SA in medical education, which showed an increasing trend in SA research year by year. The United States (US) had the most publications (512), and the University of British Columbia had the most publications (n = 39). Bibliographic coupling analysis identified five clusters of information related to SA in medical education: SA indicators and medical school accreditation; medical students’ attitudes towards underserved populations; the role of physicians in translating SA into medical education; the impact of socially accountable medical education; and preparing medical students for achieving SA in medical education. The findings demonstrate a rising trend in SA research in medical education. However, collaboration networks were stronger in developed countries, indicating the need to enhance research networks with developing countries. The five clusters of SA-related information could serve as a foundation for future research. The study highlights the importance of investigating obstacles to the adoption of SA in medical education and implementing initiatives to foster its comprehensive integration.
Baryon Isovector Electric Properties and the Large N_c and Chiral Limits
Creators: name: Cohen, Thomas D.
Publisher: name: arXiv
Year: 1995
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: A model independent calculation is given for the nucleon isovector electric charge radius which is valid in the limit $N_c \rightarrow \infty$, $m_π\rightarrow 0$, $N_c m_π$ fixed. This expression reduces to that of the Skyrme model in the limit $N_c m_π \rightarrow \infty$.
description: One figure avialable on request, contact cohen@quark.umd.edu
Time-dependent failure analysis of large block size riprap as bank protection in mountain rivers
Creators: name: Jafarnejad Chaghooshi, Mona
Publisher: name: Lausanne, EPFL - LCH
Year: 2016

description: The protection of riverbanks with blocks, called riprap, is the most used method in alpine rivers to avoid uncontrolled lateral erosion. For rivers with significant bed slopes large boulders have to be used in order to withstand high flow forces. Such large boulders cannot be dumped anymore, like in the case of lowland rivers, but they have to be placed individually by machines because of their weight. Consequently the blocks are better interlocked even if a rough surface of the riprap is required. Thus a higher resistance of such individually placed or “compressed” riprap may be expected. The existing design methods have been developed for dumped riprap with relatively small block sizes. Dr. Mona Jafarnejad studied for the first time systematically the effect of compressed riprap, that means with individually placed blocks having a good interlocking, on the failure resistance. Based on a relative roughness and modified Froude number, Dr. Jafarnejad proposed an empirical relationship which can assess the limit between stable and failure conditions of the blocks and thus gives a criterion for the required minimum block size. Furthermore, and also for the first time, the time-dependant failure was analysed which is also not considered in existing design methods. Dimensionless empirical relationships between the time to failure and the bed shear stress as well as flow depth were developed. The results revealed that for a total failure of the compressed riprap a relatively high number of blocks have to be eroded. In loose dumped riprap, normally the erosion of a few blocks results in a fast failure knowing that the time to failure is very important in practice since the flood peaks have only a limited duration. Additionally Dr. Jafarnejad studied the effect of a second layer of individually placed riprap on the time-dependant failure process, which is novel. She developed also an empirical relationship, which takes into account the influence of such a second layer. For the same longitudinal channel slope and side bank slopes, the second layer stabilizes the section and postpones failure. The effect of a second layer is more significant for higher bed slopes and bank side slopes. Finally, compared to the traditional design methods, using a safety factor approach, Dr. Jafarnejad developed a probabilistic failure analysis method for riprap, which considers uncertainties of the design parameters and the future evolution of bed load transport under climate change.
Clock transitions versus Bragg diffraction in atom-interferometric dark-matter detection
Creators: name: Derr, Daniel
name: Giese, Enno
Publisher: name: [Melville, NY] : AIP Publishing
Year: 2023
Subjects: subject: gravity
subject: dilation
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: Atom interferometers with long baselines are envisioned to complement the ongoing search for dark matter. They rely on atomic manipulation based on internal (clock) transitions or state-preserving atomic diffraction. Principally, dark matter can act on the internal as well as the external degrees of freedom to both of which atom interferometers are susceptible. We, therefore, study in this contribution the effects of dark matter on the internal atomic structure and the atom's motion. In particular, we show that the atomic transition frequency depends on the mean coupling and the differential coupling of the involved states to dark matter, scaling with the unperturbed atomic transition frequency and the Compton frequency, respectively. The differential coupling is only of relevance when internal states change, which makes detectors, e.g., based on single-photon transitions sensitive to both coupling parameters. For sensors generated by state-preserving diffraction mechanisms like Bragg diffraction, the mean coupling modifies only the motion of the atom as the dominant contribution. Finally, we compare both effects observed in terrestrial dark-matter detectors.
Hipparchia hermione
Creators: name: Bonelli, Simona
name: Barbero, Francesca
name: Casacci, Luca Pietro
name: Cerrato, Cristiana
name: Balletto, Emilio
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Nymphalidae
Hipparchia
Hipparchia hermione

description: Hipparchia hermione (Linnaeus, 1764)
Papilio hermione Linnaeus, 1764: 281.
FIRST RECORD FOR THE VALDIERI AREA. — Turati & Verity (1911).
CHOROTYPE. — CS European.
ECOLOGY. — Subnemoral, lowland-upper montane, thermophilous, xerophilous.
EDIT PROJECT SAMPLING. — Natural reserve Juniperus phoenicea, dry grassland 878 m, VII.2008, CS.
description: Published as part of Bonelli, Simona, Barbero, Francesca, Casacci, Luca Pietro, Cerrato, Cristiana & Balletto, Emilio, 2015, The butterfly fauna of the Italian Maritime Alps: results of the EDIT project, pp. 139-167 in Zoosystema 37 (1) on page 158, DOI: 10.5252/z2015n1a6, http://zenodo.org/record/5154896
Hydraulic performance of stepped spillway aerators and related downstream flow features
Creators: name: Terrier, Stéphane
Publisher: name: Lausanne, EPFL-LCH
Year: 2016

description: Roller compacted concrete gravity dams are built since several decades. In combination with such dams, stepped spillways are very often used as efficient flood release structures. More recently stepped spillways are also excavated into rock along the abutments of embankment dams. Over the last years, the specific design discharge over stepped spillways has increased significantly. Specific discharge higher than 30m3/sm for skimming flow regime are not rare anymore. For such high specific discharges risk of cavitation may occur at the beginning of the stepped chute. This risk can be mitigated by implementing in the first step of the stepped chute a specially designed aerator. In order to prepare design guidelines for such aerators, Dr. Stéphane Terrier carried out for the first time a systematic experimental study regarding the hydraulic performance of a deflector aerator by varying the chute angle, the step height, the approach flow Froude number, the approach flow depth, the deflector angle as well as the deflector height. He systematically analyzed the lower and upper surfaces of the jet issued by the deflector and could derive empirical equations for the lower and upper effective takeoff angles. Together with an equation to obtain the takeoff velocity, the candidate could then describe the lower and upper jet surfaces with ballistic equations. Then the maximum jet elevation, the jet length and the jet impact angle on the pseudo-bottom can then be obtained, which are the most important parameters to predict the aerator performance. Dr. Terrier demonstrated that the air entrainment coefficient of the aerator could be derived from the relative jet length. Finally, he proposed an empirical relationship, which allows obtaining the air entrainment coefficient as a function of the Froude number and the deflector geometry. As main result, he gives relations estimating the average and bottom air concentrations at significant locations along the flow, proving a sufficient value to counter cavitation. With this information Dr. Terrier could present for the first time a procedure for the design of a stepped spillway aerator.