1,489 research outputs found
Stereophilus filicornis Biscaccianti & Esser & Cuoco & Grimaldi & Audisio 2022, gen. et comb. nov.
No full textStereophilus filicornis (Reitter, 1887) gen. et comb. nov. Fig. 1 Atritomus filicornis Reitter, 1887b: 288. Atritomus boissyi Caillol, 1925: 101. Parabaptistes filicornis – auctorum. Eulagius filicornis – auctorum. New records FRANCE • 1 ♂, 2 ♀♀; Haute-Garonne, Forêt de Rieumes; 3 Sep. 1993; J. Rogé leg.; MZUF • 6 ♂♂, 5 ♀♀; Pyrénées-Orientales, Forêt de Sorède; 13 Jun 2004; F. Wachtel leg.; CES. ITALY • 1 ♂; Tuscany, Collesalvetti (LI), Nugola, Bosco Malenchini; 43°34′54″ N, 10°27′30″ E; alt. 45 m; 14 Jul. 2012; S. Cuoco leg.; on dry branches of Quercus cerris L.; ABB • 1 ♂; same collection data as for preceding; 13 Aug. 2012; S. Cuoco leg.; sifting litter in a Turkey oak wood; ABB • 2 ♂♂, 1 ♀; Tuscany, Collesalvetti (LI), Nugola, Bosco Macchia Grossa; 43°35′27″ N, 10°26′54″ E; alt. 40 m; 8 May 2016; S. Cuoco leg.; sifting litter in a Turkey oak wood; CSC • 1 ♀; same collection data as preceding; ABB • 1 ♀; same collection data as for preceding; 18 Jun. 2016; S. Cuoco leg.; on Fraxinus ornus L.; CSC • 2 ♀♀; same collection data as for preceding; 1 Jul. 2016; S. Cuoco leg.; on Fraxinus ornus L.; CSC • 1 ♀; Tuscany, Livorno, Antignano, Mt Burrone; 43°29′16″ N, 10°20′10″ E; alt. 95 m; 12 May 2013; S. Cuoco leg.; on Erica arborea L.; ABB • 3 ♀♀; same collection data as for preceding; CSC • 1 ♀; Tuscany, Livorno, Bellosguardo, Via di Popogna (SP8) km 6.7; 43°30′41″ N, 10°23′18″ E; alt. 130 m; 21 May 2013; S. Cuoco leg.; on branches of Quercus ilex L.; CSC • 1 ♂; Calabria, Aspromonte, San Giorgio Morgeto (RC), Mt Campanaro; 38°21′58.1″ N, 16°06′36.5″ E; alt. 693 m; 28 May 2018; A.B. Biscaccianti, F. Manti and E. Castiglione leg.; inside a hollow on Quercus suber L.; ABB. Remarks Stereophilus filicornis gen. et comb. nov. occurs in western and southern Europe and western North Africa. The species was described from specimens collected in Algeria, and was later also reported from Belgium, France, Germany, The Netherlands, Spain, and Tunisia (Recalde Irurzun & Pérez-Moreno 2007; Bonamie et al. 2010; Bouyon 2014; Gielen & Smets 2020; Nikitsky 2020; Bleich & Gürlich 2021; Háva 2021; Eisinger in press, all sub Eulagius). It has been imported to Great Britain, where it seems to be established (Harrison 1996; Foster 2001, 2013; Booth 2012; Denton & Dodd 2013; Nikitsky 2020, all sub Eulagius). The biology and ecology of Stereophilus filicornis gen. et comb. nov. are poorly known: some authors report catches from under bark on dead trunks, on woody debris of old trees, and by beating dead branches of broadleaf trees such as Castanea sativa Mill., Quercus canariensis Willd. (= mirbeckii Durieu), Q. robur L., Q. suber L. (Caillol 1925, sub Atritomus; Peyerimhoff 1926, sub Parabaptistes; Labatut et al. 2014, sub Eulagius); only Freeman (2003, sub Parabaptistes) reported a series of specimens reared from carpophores of Stereum hirsutum (Willd.) Pers. (Russulales, Stereaceae), sampled from Fagus sylvatica L. The single specimen here reported from southern Italy, Calabria (Aspromonte) was found by sifting wood mould, woody debris, and Daedaleopsis nitida (Durieu & Mont.) Zmitr. & Malysheva (Polyporales, Polyporaceae) carpophores, likely its local host fungus, collected from inside a large hollow on a Quercus suber trunk. The site is a mesophile cork oak mixed forest, referred to the Helleboro-Quercetum suberis association (Signorello 1984; Mercurio & Spampinato 2001). The habitat of Stereophilus filicornis gen. et comb. nov. in Tuscan sites is represented by fragments of hilly submesophile woodland dominated by Castanea sativa and Quercus cerris L. (Nugola municipality: Bosco Malenchini and Bosco Macchia Grossa) and mosaics of Mediterranean maquis, holm oak and Aleppo pine woods (Antignano and Bellosguardo municipalities) (V. Lazzeri, pers. comm.). Our records are the first of this species for Italy. According to Tempère (1974, sub Parabaptistes), the species could also be present in Sicily. However, no source was provided and the occurrence of Stereophilus filicornis gen. et comb. nov. in Sicily remains unconfirmed.Published as part of Biscaccianti, Alessandro B., Esser, Jens, Cuoco, Silvio, Grimaldi, Enrica Giuliano & Audisio, Paolo A., 2022, West Palaearctic taxa formerly connected to the ' old' genus Atritomus Reitter, 1877 (Coleoptera, Mycetophagidae): taxonomy, distribution, and description of a new genus, pp. 61-74 in European Journal of Taxonomy 828 on pages 65-66, DOI: 10.5852/ejt.2022.828.1853, http://zenodo.org/record/681152
Transport and proximity effect in unconventional ferromagnet/superconductor heterostructures
No full text2009 - 2010This dissertation collects results of my own work about heterostructures with unconventional ferromagnets
and superconductors. It both introduces the matter by reviewing part of the existing literature
and it includes original results. In particular charge and spin transport in ferromagnet/superconductor
bilayer, Josephson effect in superconductor/ferromagnet/superconductor junctions, and proximity effect
in ferromagnet/triplet superconductor structures are examined. All work has been supervised by Prof.
Canio Noce and Dr. Mario Cuoco from Dipartimento di Fisica “E. R. Caianiello”, Università degli Studi di
Salerno. I have also benefited from collaborations with Prof. Alfonso Romano and Dr. Paola Gentile from
the same department. Part of the work has been supervised by Prof. Asle Sudbø and Prof. Jacob Linder
from Department of Physics, Norwegian University of Science and Technology. I have also benefited from
collaboration with Henrik Enoksen from the same department. [edited by Author]IX n.s
Parametric Spectral Estimation and Data Whitening
No full textThe knowledge of the noise Power Spectral Density is fundamental in signal processing for the detection algorithms and for the analysis of the data. In this lecture we address both the problem of identifying the noise Power Spectral Density of physical system using parametric techniques and the problem of the whitening procedure of the sequence of data in time domain
Gravitational-Wave Burst Signals Denoising Based on the Adaptive Modification of the Intersection of Confidence Intervals Rule
No full textGravitational-wave data (discovered first in 2015 by the Advanced LIGO interferometers and awarded by the Nobel Prize in 2017) are characterized by non-Gaussian and non-stationary noise. The ever-increasing amount of acquired data requires the development of efficient denoising algorithms that will enable the detection of gravitational-wave events embedded in low signal-to-noise-ratio (SNR) environments. In this paper, an algorithm based on the local polynomial approximation (LPA) combined with the relative intersection of confidence intervals (RICI) rule for the filter support selection is proposed to denoise the gravitational-wave burst signals from core collapse supernovae. The LPA-RICI denoising method’s performance is tested on three different burst signals, numerically generated and injected into the real-life noise data collected by the Advanced LIGO detector. The analysis of the experimental results obtained by several case studies (conducted at different signal source distances corresponding to the different SNR values) indicates that the LPA-RICI method efficiently removes the noise and simultaneously preserves the morphology of the gravitational-wave burst signals. The technique offers reliable denoising performance even at the very low SNR values. Moreover, the analysis shows that the LPA-RICI method outperforms the approach combining LPA and the original intersection of confidence intervals (ICI) rule, total-variation (TV) based method, the method based on the neighboring thresholding in the short-time Fourier transform (STFT) domain, and three wavelet-based denoising techniques by increasing the improvement in the SNR by up to 118.94% and the peak SNR by up to 138.52%, as well as by reducing the root mean squared error by up to 64.59%, the mean absolute error by up to 55.60%, and the maximum absolute error by up to 84.79%
A gravitational wave detector: The virgo interferometer
No full textGravitational waves were predicted in 1916 by Einstein as a conse- quence of the theory of General Relativity: accelerated masses can produce ripples propagating at the speed of light, which perturb the space-time metric. Thanks to the extremely weak coupling with matter, gravitational waves can cross the universe undisturbed and, hence, are a probe of the regions where they are produced which is not accessible by the eventual electromagnetic counterpart. The gravitational waves sources of detectable amplitudes are expected to be compact astrophysical sources such as the coalescence of binaries formed by black holes and neutron stars, the collapses of stellar cores, or the rotation of non-axis-symmetric neutron stars. For more than 40 years the search for gravitational waves has been pursued with resonant detectors made of metallic bars. The development of gravitational wave detectors based on laser interferometers started in the early seventies. After more than two decades of development, the construction of the first interferometers with kilometer scale arms started in the nineties. The sensitivity of such detectors is fun- damentally proportional to its length, and with its 3 kilometer long arms Virgo is the largest gravitational wave detector in Europe, and the third largest in the world. It is located at the European Gravitational Observatory (EGO), close to Pisa, and it is designed to detect gravitational waves emitted by astrophysical sources in the frequency range between 10Hz and a few kHz. Among the other current ground- based gravitational wave detectors, Virgo is the one having the best sensitivity at low frequency, thanks to the particular seismic attenuators, from which the mirrors are suspended. Construction started in 1996 and ended in July 2003. After a very intense commissioning phase, the performances of the detector are now very close to the design ones, and the detector is entering the operation phase. In parallel, the design phase of the second generation of interferometers should be finalized this year with a construction planned to start in 2011. Also, the conceptual design is under study for a third generation. The corresponding European project is called the "Einstein Telescope". ©2010 by Società Italiana di Fisica
Virgo an interferometer for gravitational wave detection
No full textGravitational waves propagating from rapidly accelerating star masses can be detected by means of interferometric techniques. The Virgo detector is a Michelson interferometer, with two 3 km long Fabry-Perot cavities, that is going to be built in the countryside of Pisa (Italy). Principles of interferometric gravitational wave detection, and the main noise sources in the Virgo apparatus are treated. The Virgo optical scheme and its main components are also described. Finally, an overview on the status of works at the Virgo site is presented. © 2000 by the American College of Cardiology
Editorial: Efficient AI in particle physics and astrophysics
No full textEditorial: Efficient AI in particle physics and astrophysic
Evolution of topological superconductivity by orbital-selective confinement in oxide nanowires
No full textWe determine the optimal conditions to achieve topological superconducting phases having spin-singlet pairing for a planar nanowire with a finite lateral width in the presence of an in-plane external magnetic field. We employ a microscopic description that is based on a three-band electronic model including both the atomic spin-orbit coupling and the inversion asymmetric potential at the interface between oxide band-gap insulators. We consider amplitudes of the pairing gap, spin-orbit interactions, and electronic parameters that are directly applicable to nanowires of LaAlO3-SrTiO3. The lateral confinement introduces a splitting of the d orbitals that alters the orbital energy hierarchy and significantly affects the electron filling dependence of the topological phase diagram. Due to the orbital directionality of the t(2g) states, we find that in the regime of strong confinement the onset of topological phases is pinned at electron filling where the quasiflat heavy bands start to get populated. The increase of the nanowire thickness leads to a changeover from a sparse-to-dense distribution of topologically nontrivial domains which occurs at the crossover associated with the orbital population inversion. These findings are corroborated by a detailed analysis of the most favorable topological superconducting phases in the electron doping-magnetic field plane highlighting the role of orbital-selective confinement
Gas isotopic signatures (He, C, and Ar) in the Lake Kivu region (western branch of the East African rift system): Geodynamic and volcanological implications
No full textOn 17 January 2002, the city of Goma was partly destroyed by two of the several lava flows erupted from a roughly N-S oriented fracture system opened along the southern flank of Mount Nyiragongo (Democratic Republic of Congo), in the western branch of the East African rift system. A humanitarian and scientific response was promptly organized by international, governmental, and nongovernmental agencies coordinated by the United Nations and the European Union. Among the different scientific projects undertaken to study the mechanisms triggering this and possible future eruptions, we focused on the isotopic (He, C, and Ar) analysis of the magmatic-hydrothermal and cold gas discharges related to the Nyiragongo volcanic system, the Kivu and Virunga region. The studied area includes the Nyiragongo volcano, its surroundings, and peripheral areas inside and outside the rift. They have been subdivided into seven regions characterized by distinct He/He (expressed as R/Rair) ratios and/or δ13 C-CO2 values. The Nyiragongo summit crater fumaroles, whose R/Rair and δ13 C-CO2 values are up to 8.73 and from -3.5% to -4.0% VPDB, respectively, show a clear mantle, mid-ocean ridge basalt (MORB)-like contribution. Similar mantle-like He isotopic values (6.5-8.3 R/Rair) are also found in CO2-rich gas emanations (mazukus) along the northern shoreline of Lake Kivu main basin, whereas the 13δC- CO2 values range from -5.3% to -6.8% VPDB. The mantle influence progressively decreases in (1) dissolved gases of Lake Kivu (2.6-5.5 R/R air) and (2) the distal gas discharges within and outside the two sides of the rift (from 0.1 to 1.7 R/Rair). Similarly, δ13 C-CO2 ratios of the peripheral gas emissions are lighter (from -5.9% to - 11.6% VPDB) than those of the crater fumaroles. Therefore, the spatial distribution of He and C signatures in the Lake Kivu region is mainly produced by mixing of mantle-related (e.g., Nyiragongo crater fumaroles and/or mazukus gases) and crustal-related (e.g., gas discharges in the Archean craton) fluids. The CO2/He ratio (up to 10×10) is 1 order of magnitude higher than those found in MORB, and it is due to the increasing solubility of CO2 in the foiditic magma feeding the Nyiragongo volcano. However, the exceptionally high 40Ar */He ratio (up to 8.7) of the Nyiragongo crater fumaroles may be related to the difference between He and Ar solubility in the magmatic source. The results of the present investigation suggest that in this area the uprising of mantle-originated f luids seems strongly controlled by regional tectonics in relation to the geodynamic assessment of the rift. These fluids are mainly localized in a relatively small zone between Lake Kivu and Nyiragongo volcano, with important implications in terms of volcanic activity. Copyright 2010 by the American Geophysical Union
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