1,721,002 research outputs found
The Dynamics of Social Disadvantage in Dublin, 1991-2002
No full textBetween 1991 and 2002, the social composition of Dublin's city centre underwent a dramatic transformation due to redevelopment and gentrification processes. As a result of the influx of dual-income couples and the partial expulsion of poor individuals and families, the social composition of the city centre was transformed, raising a number of questions regarding the social articulation of affluence and disadvantage within the Dublin area. In this chapter, I outline a new approach to the study of disadvantage and social segregation which relies on confirmatory statistical modelling techniques. This methodology provides precise estimates of social disadvantage at local level, permitting a detailed spatial analysis of the impact of rapid economic growth during the 1990s on the spatial articulation of social disadvantage in Dubli
The importance of clinical semiotics and instrumental investigations in the diagnosis and surgical treatment of osteoid osteoma. A report of 6 cases
No full textThe author emphasize the importance of a complete examination, including history, symptomatology and instrumental tests in the diagnosis of osteoid osteoma (O.O.). This lesion is often difficult to diagnose, particularly at unusual sites. However, by the use of accurate radiography, stratigraphy, bone scan and CAT, a pre-operative accurate diagnosis is usually possible. The authors emphasize the importance of the least invasive surgical approach and the complete removal of the lesion with generous curettage. This is not always easy, as illustrated in the present study, which includes atypical sites, sometimes in delicate anatomical situations. They also illustrate a particular method used for removal
Burial evolution of sedimentary successions in the Lurestan Basin, NW of Zagros Folded Belt, Iran
Full text linkAbstract
The main objective of this thesis is to unravel burial evolution and thermal-maturation history of the Mesozoic-Cenozoic sedimentary successions of the Lurestan basin in NW Zagros, Iran by integrating petrographic (e.g.vitrinite reflectance) thermal parameters and inorganic (e.g. illite content in mixed layers I-S) thermal parameters derived by the optical analysis of the organic matter dispersed in sediments and by XRD diffraction analysis of clay minerals. The integration of vitrinite reflectance and illite content in I-S may provide important pieces of information on heating rates that cannot be provided by a single indicator. Vitrinite can be used to estimate the degree of maturation of organic matter at low to high temperatures, even to the graphite-grade metamorphic facies.
By the1D modeling provided, maximum temperature experienced by the Lurestan sedimentary and the amount of eroded material through time will be determined. Then thermal maturity and quality of source rocks providing insights for hydrocarbon generation and exploration will be determined by Rock-Eval pyrolysis results.
The samples collected from eight wells and two sections. Results obtained from organic and inorganic laboratory analysis have been described in the chapter 4 and then integrated for making 1D modeling by Basin Mod1 software and discussed in chapters 5 and 6.
Data obtained in this Ph.D. work, in fact, were used to characterize and discriminate the thermal evolution of the Mesozoic and Cenozoic sedimentary succession by focusing more on the Garau Formation as a main source rock in the Lurestan basin.
1D modeling indicate that illite content in I-S is a better paleothermal indicator than vitrinite reflectance in the Lurestan basin. Vitrinite reflectance showed a complex distribution of organic macerals with a wide range of values in most of the wells without a clear trend as a function of depth. In addition, organic thermal indicators often point to higher levels of thermal maturity than those recorded by clay minerals.
This could be due to some reasons as following:
High vitrinte reflectance values are generally due to dishomogeneity of the organic matter surface, proximity to bright components such as pyrite, size of the particles, orientation of vitrinite fragments due to surface relief/irregularities, mixture of fragments (suppressed/reworked) with the indigenous population of vitrinites, and surfaces with imperfections or "noise" - scratches, (Borrego et al., 2006). Vitrinite macerals can also have different hydrogen contents that may affect thermal alteration. Hydrogen-poor and oxygen-rich vitrinites show higher levels of thermal maturity than those recorded hydrogen rich-vitrinite fragments. Also, vitrinite macerals can be reworked or organic matter can be used as additive during drilling procedure (NIOC personal communication) clouding the thermal signal due to burial.
Burial histories calibrated by inorganic thermal parameters revealed a decrease in levels of thermal maturity form the internal to the external part of the Zagros belt. In particular, in the internal part of the belt the Garau Fm experienced maximum sedimentary burials in the order between 3.95 km and 5.45 km and maximum temperatures between 124 and 169°C whereas lower burial conditions occurred in the external part (between 3.65 and 4.9 km) with associated temperatures in the range of 114 - 156°C. These values directly come from the 1D modeling. The onset of hydrocarbon generation for the Garau Fm. occurred before the folding stage of the Zagros belt, from Maastrichtian to early Eocene time. The thickness of eroded rock units decreases toward the external sectors as well from 1.8 - 3km to 1.2 - 2.4 km. Exhumation took place in late Miocene in the internal part of the belt and in early Pliocene time in the external part according to the age of growth strata in the Agha jari and Bakthiari Fms. The base age of the Agha jari Fm is Upper Miocene.
The thickness of the Garau Formation in internal part ranges between 577 and 799 m and in external ranges between 200 and 1000 m. The bigger thickness of the Garau Formation is in Kabir Kuh anticline.
The Garau Formation by the maximum burial indicate middle mature stage (the Huleylan #1, Mahi Dasht #1, Bankul #1, Samand #1 wells, and Kabir Kuh section), late mature (Baba Ghir #1, Darreh Baneh East #1 wells, and Tang-e Haft section) and overmature stages of hydrocarbon generation and main gas zone (North Shah Abad #1 well). The onset of hydrocarbon generation in the North Shah Abad #1, Baba Ghir #1, Samand #1 wells, and Kabir Kuh and Tang-e Haft sections occurred in the Late Cretaceous time (pre-folding stage), earlier than the other wells, and in the Bankul #1, Mah Dasht #1, Darreh Baneh East wells occurred in the Early Eocene time (pre-folding stage). The onset of hydrocarbon generation in the Huleylan well occurred later than the other wells in the Paleocene time occording the modeling.
Vitrinite reflectance data present the late mature and overmature stage of hydrocarbon generation for the wells and sections in internal and external part except Huleylan #1 well that vitrinite reflectance value ranging between 0.61% -0.89% that indicate the peak maturity level for producing of oil.
Clay mineralogy data define their paleo-temperatures as they provide a signal throughout the entire sedimentary succession. Respect to Merriman and Frey’ chart ( figure 3.2.1.1), all the samples belong to internal and external part of the Lurestan basin have a potential of producing of hydrocarbon except Darreh Baneh East #1 by random structure Ro and I% in Mixed layers I-S between 46 and 65%.
The HI versus Tmax graphs also indicate that the sediments are of type III kerogen and gas prone and they are mature (early - late) and overmature. The TOC contents in all samples of the Garau Formation show a wide range of hydrocarbon potential from poor to excellent. The plot of S1 vs.TOC and show the presence of indigenous hydrocarbon in all samples
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Approccio multidisciplinare alle cave
No full textNell'ambito della pianificazione dell'attività estrattiva, un elemento essenziale per la valutazione delle potenzialità di sfruttamento del giacimento è rappresentato dalla conoscenza dell'estensione spaziale e della configurazione tridimensionale dell'ammasso roccioso, nonché delle sue proprietà litologiche.
In questo lavoro viene presentato un approccio multidisciplinare finalizzato alla definizione del modello geologico-strutturale tridimensionale (3D) del sito di coltivazione, integrante criteri di rilevamento geologico-strutturale con indagini minero-petrografiche. Il modello proposto permette (i) di considerare i rapporti geometrico-strutturali con le litologie circostanti il giacimento, e (ii) di analizzare, in un contesto tridimensionale, il corteo di deformazione (discontinuità planari e lineari) che può compromettere o alterare le proprietà geomeccaniche e mineralogiche dell’ammasso roccioso. Di seguito, sono illustrati i risultati ottenuti dall’applicazione di tale metodologia ad un caso specifico di coltivazione in rocce ofiolitiche nell’areale della cava “Tana dei Banditi” (Genova)
Magnetic and structural constraints for the noncylindrical evolution of a continental forebulge (Hyblea, Italy)
No full textThe Hyblean Plateau in southeastern Sicily, Italy, consists of an isolated and elevated forebulge structure formed since the early Miocene time by bending the foreland lithosphere below the advancing Maghrebian thrust-fold belt. The Hyblean forebulge is presently located in front of an orogenic recess and partly surrounded by two orogenic salients. We analyzed magnetic (anisotropy of magnetic susceptibility) and structural (joints, faults, slickenside lineations, and bed attitudes) fabric data from Neogene carbonate rocks exposed atop the Hyblean forebulge. Results showed unidirectional fabrics developed in response to a NW-SE extension at the end the of early Miocene time and beginning of middle Miocene time, and duple-to-multiple fabrics developed in response to major NW-SE and NE-SW extensions from the Langhian time onward. We interpreted these results as the evidence for the growth of a doubly plunging forebulge due to the presence of foreland crustal heterogeneities, which enhanced differential retreating processes of the foreland along the subduction zone and the subsequent formation of orogenic salients and recesses. A semianalytical model shows that the observed brittle deformations potentially involved a significant thickness of the carbonate sedimentary cover, thereby reducing the lithosphere flexural rigidity and enhancing its bending aptitude
Architecture and deformation mechanisms within a carbonate-hosted fault zone (Fucino basin)
No full textThe Central Apennine are one of the most seismically active regions in the Mediterranean area and is affected by moderate
to large shallow earthquakes that enucleate in and propagate through carbonate rocks. In this work we present a detailed fieldwork
and microstructural analysis to define the architecture and deformation mechanisms of an exhumed fault zone in carbonates, the Tre
Monti fault, at the northern boundary of the Fucino Basin. Fault rocks assemblages show differences in deformation mechanisms
between the main and external fault planes, and subsidiary fault planes developed within the damage zone. We infer that this variety
of fault rocks represents different deformation processes acting during different stages of fault development and fluid circulation. The
multidisciplinary but field-based study of fault surfaces and fault rocks is fundamental to reveal the geological record of past
earthquakes and seismic cycles and is strongly complementary to the seismological-based one
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