40,312 research outputs found
Syn-contractional overprinting between extension and shortening along the Montagna dei Fiori Fault during Plio-Pleistocene antiformal stacking at the Central Apennines thrust wedge toe
No full text©2018. American Geophysical Union. All Rights Reserved. The Montagna dei Fiori fault vertically offsets the crest of the NW-SE trending Montagna dei Fiori anticline in the distal foothills of the central Apennines. There are several interpretations to explain this extensional fault system in close proximity to the Apennine deformation front. A prefolding age of the Montagna dei Fiori fault prevails in models and ideas, based on evidence of Triassic to Early Jurassic rift-related faults and on thickness and facies distribution of Miocene sediments. However, overprint relationships between extension and shortening are generally speculative and relative age constraints are loose. In this paper we provide an alternative interpretation based on new structural and geochemical data that does not support any preshortening scenarios. The outcrops show that (1) failure of the prerift to syn-rift Jurassic platform carbonates is controlled by a pattern of ~ N-S and E-W fault trends, (2) cessation of fault activity coincides with a breakup unconformity of Late Jurassic age, and (3) a large variety of S-C shear fabrics occurs along the Montagna dei Fiori fault. Petrography, C-O stable isotope, and microthermometric data of calcite veins provide constraints on the environmental conditions of deformation. Our multidisciplinary data set favors a partitioning of strain by the interaction of horizontal shortening and related uplift, and by gravitational reequilibration controlled by antiformal stacking underneath the Montagna dei Fiori anticline. Therefore, shortening and extensional strain fields are genetically connected, coeval, while nucleating from different levels in the mechanical stratigraphy. We discuss the implications of this model on the seismo-tectonic framework of active faulting in the central Apennines of Italy.sponsorship: This work is part of a joint research project funded by Shell Global Solutions. We are grateful to Shell for releasing this material for publication. Data presented in this article are proprietary of Shell Global Solutions and, for confidentiality agreements, cannot be released for free download. We warmly thank F. Mondino (formerly at Shell) for the enthusiastic support she gave to the early stages of this project. Massimo Mattei (Roma Tre University) kindly introduced F. Storti to the geology of the Montagna dei Fiori. Discussions with Andrea Artoni (Parma University) on the geology of the area and with J. Solum and C. Tueckmantel (Shell) on the implications for hydrocarbon geology are greatly appreciated. We are also grateful to L. Barchi and A. Comelli for support with SEM analyses and thin-section preparation, respectively, and to E.M. Selmo for isotopic analyses. Stereographic projections were made by using the Daisy3 software, available for free download at http://host.uniroma3.it/progetti/fralab/.F.Storti conceived the research, contributed to collect and interpret structural data, and wrote the bulk of the manuscript; F. Balsamo contributed to collect and interpret structural data, discussed interpretations, and critically reviewed the manuscript; M. Mozafari collected petrographic and microthermometric data, provided their interpretation, discussed their meaning into the structural framework, and critically reviewed the manuscript; A. Koopman participated to some fieldwork, contributed to develop the proposed evolutionary model, and critically reviewed the manuscript; R. Swennen participated to some fieldwork, discussed the results of the study of calcite veins and their framing into the structural framework, and critically reviewed the manuscript; C. Taberner participated to some fieldwork, discussed the results of the study of calcite veins and their framing into the structural framework, and critically reviewed the manuscript. Personal note by F. Storti: This paper is dedicated to the memory of my beloved father, Andreino Storti, who spent his life to allow me enjoying research and teaching in geology. The so abundant flowers that give the name to this mountain will make homage to you every spring, forever. Arrivederci papa. I am honored to publish this paper in a volume celebrating Renato Funiciello as an outstanding geologist. He was also a great man that made sure I could live in Roma and constantly encouraged and supported my research work at the Geology Department of Roma Tre University. His way to be a professor continues to be a landmark in my professional life in Parma. (Shell Global Solutions)status: Publishe
Hesperoptenus gaskelli Hill 1983
No full textHesperoptenus gaskelli Hill, 1983. Bull. Brit. Mus. (Nat. Hist.) Zool., 45:169. TYPE LOCALITY: Sulawesi, Central R. Ranu. DISTRIBUTION: Sulawesi. COMMENTS: Subgenus Milithronycteris.Published as part of Karl F. Koopman, 1993, Order Chiroptera, pp. 137-241 in Mammal Species of the World (2 nd Edition), Washington and London :Smithsonian Institution Press on page 204, DOI: 10.5281/zenodo.735306
Global and Koopman modes analysis of sound generation in mixing layers
No full textIt is now well established that linear and nonlinear instability waves play a significant role in the noise generation process for a wide variety of shear flows such as jets or mixing layers. In that context, the problem of acoustic radiation generated by spatially growing instability waves of two-dimensional subsonic and supersonic mixing layers are revisited in a global point of view, i.e., without any assumption about the base flow, in both a linear and a nonlinear framework by using global and Koopman mode decompositions. In that respect, a timestepping technique based on disturbance equations is employed to extract the most dynamically relevant coherent structures for both linear and nonlinear regimes. The present analysis proposes thus a general strategy for analysing the near-field coherent structures which are responsible for the acoustic noise in these configurations. In particular, we illustrate the failure of linear global modes to describe the noise generation mechanism associated with the vortex pairing for the subsonic regime whereas they appropriately explain the Mach wave radiation of instability waves in the supersonic regime. By contrast, the Dynamic Mode Decomposition (DMD) analysis captures both the near-field dynamics and the far-field acoustics with a few number of modes for both configurations. In addition, the combination of DMD and linear global modes analyses provides new insight about the influence on the radiated noise of nonlinear interactions and saturation of instability waves as well as their interaction with the mean flow
Lie group valued Koopman eigenfunctions
No full text© 2023 IOP Publishing Ltd & London Mathematical Society cc-byEvery continuous-time flow on a topological space has associated to it a Koopman operator, which operates by time-shifts on various spaces of functions, such as C r , L 2, or functions of bounded variation. An eigenfunction of the vector field (and thus for the Koopman operator) can be viewed as an S 1-valued function, which also plays the role of a semiconjugacy to a rigid rotation on S 1. This notion of Koopman eigenfunctions will be generalized to Lie-group valued eigenfunctions, and we will discuss the dynamical aspects of these functions. One of the tools that will be developed to aid the discussion, is a concept of exterior derivative for Lie group valued functions, which generalizes the notion of the differential d f of a real valued function f. The extended notion of Koopman eigenfunctions utilizes a geometric property of usual eigenfunctions. We show that the generalization in a geometric sense can be used to reveal fundamental properties of usual Koopman eigenfunctions, such as their behaviour under time-rescaling, and as submersions
Mops petersoni
No full textMops petersoni (El Rayah, 1981). R. Ontario Mus. Life Sci. Occas. Pap., 36:3. TYPE LOCALITY: Cameroon, 15 km S Kumba (4°39'N, 9°26'E). DISTRIBUTION: Cameroon and Ghana, perhaps Sierra Leone. COMMENTS: Subgenus Xiphonycteris. Described in Tadarida (Xiphonycteris), but see comments under Tadarida and Mops.Published as part of Karl F. Koopman, 1993, Order Chiroptera, pp. 137-241 in Mammal Species of the World (2 nd Edition), Washington and London :Smithsonian Institution Press on pages 236-237, DOI: 10.5281/zenodo.735306
Rhinolophus guineensis Eisentraut 1960
No full textRhinolophus guineensis Eisentraut, 1960. Stygg. Beitr. Naturk., 39:1. TYPE LOCALITY: Guinea, Tahiré (foot of Kelesi Plateau). DISTRIBUTION: Guinea, Sierra Leone, Liberia. COMMENTS: Originally described as a subspecies of R. landeri, but see Böhme and Hutterer (1979) who demonstrated that it was a separate species.Published as part of Karl F. Koopman, 1993, Order Chiroptera, pp. 137-241 in Mammal Species of the World (2 nd Edition), Washington and London :Smithsonian Institution Press on page 166, DOI: 10.5281/zenodo.735306
Vampyressa brocki Peterson 1968
No full textVampyressa brocki Peterson, 1968. R. Ontario Mus. Life Sci. Contrib., 73:1. TYPE LOCALITY: Guyana, Rupununi, ca. 40 mi. (64 km) E Dadanawa, at Ow-wi-dy-wau (Oshi Wau head, near Marara Waunowa), Kuitaro River. DISTRIBUTION: Surinam, Guyana, Amazonian Brazil, SE Colombia. COMMENTS: Subgenus Metavampyressa.Published as part of Karl F. Koopman, 1993, Order Chiroptera, pp. 137-241 in Mammal Species of the World (2 nd Edition), Washington and London :Smithsonian Institution Press on page 193, DOI: 10.5281/zenodo.735306
Rhinopoma muscatellum Thomas 1903
No full textRhinopoma muscatellum Thomas, 1903. Ann. Mag. Nat. Hist., ser. 7, 11:498. TYPE LOCALITY: Oman, Muscat, Wadi Bani Ruha. DISTRIBUTION: Oman, W Iran, S Afghanistan, perhaps Ethiopia. SYNONYMS: pusilium, seianum. COMMENTS: The Ethiopian record may be misidentified R. hardwickei macinnesi. See Qumsiyeh and Jones (1986, Mammalian Species, 263).Published as part of Karl F. Koopman, 1993, Order Chiroptera, pp. 137-241 in Mammal Species of the World (2 nd Edition), Washington and London :Smithsonian Institution Press on page 155, DOI: 10.5281/zenodo.735306
FIG.1 in Notes on Bats from the Pacific Lowlands of Guatemala
No full textFIG.1.-Map of southwestern Guatemala showing bat collecting stations.Published as part of Dickerman, R. W., Koopman, K. F. & Seymour, C., 1981, Notes on Bats from the Pacific Lowlands of Guatemala, pp. 406-411 in Journal of Mammalogy 62 (2) on page 407, DOI: 10.2307/1380726, http://zenodo.org/record/459104
Rhinolophus clivosus Cretzschmar 1828
No full textRhinolophus clivosus Cretzschmar, 1828. In Rüppell, Atlas Reise Nordl. Afr., Zool. Säugeth., p. 47. TYPE LOCALITY: Saudi Arabia, Muwaylih (= Mohila). DISTRIBUTION: Turkmenistan to Afghanistan; Arabia to Algeria; Subsaharan Africa to Liberia, Cameroon and South Africa. SYNONYMS: acrotis, andersoni, angur, bocharicus, brachygnathus, hillorum, keniensis, schwarzi, zuluensis. COMMENTS: Includes bocharicus; see Aellen (1959:362-366). R. bocharicus is considered a species by Hanak (1969), DeBlase (1980:94-97), Gromov and Baranova (1981), and Pavlinov and Rossolimo (1987). This species does not include deckenii or silvestris; see Koopman (1975:386).Published as part of Karl F. Koopman, 1993, Order Chiroptera, pp. 137-241 in Mammal Species of the World (2 nd Edition), Washington and London :Smithsonian Institution Press on page 164, DOI: 10.5281/zenodo.735306
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