1,357,304 research outputs found
Endovascular treatment: materials
No full textVisceral and renal artery aneurysms are rare but life-threatening pathologies. Many techniques have been proposed for their treatment, and both open surgery and endovascular strategies have proven to be safe and effective. Many specialists can be involved in the treatment of these aneurysms, from vascular surgeons to interventional radiologists, and the knowledge of every different possible approach is fundamental to offer the patient the best outcome. In this book, all the aspects of visceral and renal artery aneurysms have been widely discussed, from epidemiology and anatomical variations to surgical approaches and materials. To conclude, the authors reported a large series of case reports from different experts in order to obtain a better vision of the real-world practice on this topic
Set in Stone? Discussing the early Upper Palaeolithic taxonomy using European and Levantine assemblages
No full textThe early Upper Palaeolithic marks the introduction at a continental scale of a fully-fledged laminar industry, and it is associated with the presence of Homo sapiens in the Near East and in Europe. For this period there are three commonly recognised early Upper Palaeolithic technocomplexes : the Early Aurignacian and the Protoaurignacian, in Europe, and the Early Ahmarian, in the Levant. They have been used to illustrate different dispersal routes and behavioural adaptations to climate change, different regional settings or to infer different land-use and mobility strategies. Still, there is no consensus on the criteria for assigning one lithic assemblage to a particular early Upper Palaeolithic technocomplex. The early Upper Palaeolithic assemblages from Banat are among those showing ambiguous results when observed through the current taxonomical lens. This paper evaluates the taxonomical stances comparing technological raw data from extensively published early Upper Palaeolithic sites in Europe and the Levant. The comparison of assemblages attributed to different technocomplexes reveals a much more homogenous picture than expected. Various behaviours that are ascribed to a particular technocomplex are widespread in others too, but they are overlooked because of unclear and non-standardised terminology. The present paper shows that trying to fit the archaeological record in abstract, short definitions leads to misunderstandings, with clear implications on the further conclusions made on human past behaviours. It further advocates for creating new shared criteria for analysing lithic assemblages and thus overcoming the taxonomical impasse.Paleoliticul Superior Vechi este perioada care marchează răspândirea lui Homo sapiens și a industriilor laminare la nivelul întregii Europe și în Orientul Apropiat. Pentru această perioadă sunt în general definite trei tehnocomplexe : Aurignacianul timpuriu și Protoaurignacianul în Europa și Ahmarianul timpuriu în Levant. Ele sunt folosite în încercarea de a ilustra posibilele căi de răspândire, a adaptărilor comportamentale la schimbările climatice și a particularităților regionale, precum și în identificarea strategiilor de exploatare a teritoriului și a mobilității. Totuși, în prezent nu există un consens privind criteriile de încadrare a diferitelor industrii litice într-un anumit tehnocomplex. Industriile Paleoliticului superior vechi din Banat sunt un bun exemplu pentru dificultatea încadrării lor taxonomice. Articolul de față propune evaluarea perspectivelor taxonomice prin compararea datelor primare obținute din publicațiile care prezintă siturile europene și levantine ale acestei perioade. Prin compararea industriilor atribuite diferitelor tehnocomplexe se observă o imagine mult mai omogenă decât ar fi de presupus. Diferite aspecte comportamentale atribuite unui tehnocomplex sunt prezente și în celelalte, dar nu sunt luate în calcul din cauza terminologiei nestandardizate. În acest articol este demonstrat cum încercarea de a defini industriile litice în concepte simple și abstracte produce neclarități cu repercusiuni asupra înțelegerii comportamentului uman din trecut. În fine, articolul pledează pentru crearea unui set standardizat de criterii în studierea industriilor litice pentru a ieși din stagnarea creată de actuala taxonomie.Gennai Jacopo. Set in Stone? Discussing the early Upper Palaeolithic taxonomy using European and Levantine assemblages. In: Materiale şi cercetãri arheologice (Serie nouã), H-S 2021. pp. 183-216
Schede per una Lista Rossa della Flora vascolare e crittogamica Italiana - Primula apennina Widmer
No full textSchede per una Lista Rossa della Flora vascolare e crittogamica Italian
The Mousterian in North-Western Tuscany: publishing fieldwork documentation leads to a new stratigraphical interpretation of the Piano di Mommio sites
No full textBackground
The Mousterian technocomplex is commonly associated with Neanderthals and therefore serves as a proxy for their presence across Europe. Stratified archaeological sites are the most informative because they can yield information about artefacts' spatial distribution and dating. Only a few of the Mousterian sites in Tuscany (Italy) met these conditions and most of these sites are concentrated in the North-Western area, with three specific sites situated in proximity to the village of Piano di Mommio, on the slopes of a small river canyon. Nevertheless, research on the sites stopped early on due to their small extent and complete excavation, which does not allow for additional fieldwork.
Methods
This article presents previously unpublished field notes, reports, and images, which are then correlated with recent archaeological surveys.
Results
This combination of historical and contemporary data aims to provide a more detailed understanding of the context in which the assemblages at these sites were found. The insights gained from this research shed light on the arrangement and positioning of artefacts at these locations, offering valuable information to guide future investigations on the assemblages.
Conclusions
The proposed stratigraphical interpretation adheres to the available information and therefore contributes to a future baseline for new research on the sites and on Neanderthal presence in the area
Like two peas in a pod: lithic technology points to high similarity in the early Upper Palaeolithic
No full textDuring the last twenty years, lithic technology has acquired a prominent role in defining techno-complexes in the early Upper Palaeolithic (eUP). Four techno-complexes, with entangled, and still debated connections, are linked to the eUP: the Southern Early Ahmarian, the Northern Early Ahmarian, the Protoaurignacian, and the Early Aurignacian. Their different approach to bladelets-making, disassociated or continuous with blades-making, coupled with a typological variability, is the main argument for splitting them into different technological traditions [1,2]. The techno-typological definitions have been embraced to understand the origin and the different routes of dispersal during the eUP [3,4]. Bladelets production and typological variability have become the gold standard for understanding eUP traditions [5]. Therefore, the research is an attempt at reconstructing the design of bladelets-making in the eUP. It is a direct first-hand technological comparison between three assemblages: Al-Ansab 1, Românești-Dumbrăvița I layer GH3 and Grotta di Fumane units A1-A2. They are dated to the eUP span, ca. 43-38 ka cal BP, and encompass at least two defined techno-complexes, Southern Early Ahmarian and Protoaurignacian. Assemblages have been sampled for cores, complete, and semi-complete blanks, analysed through chaîne opératoire approach and morpho-technological attributes. Chaîne opératoire is used for defining the different knapping stages, while the attributes are a further characterisation for identifying management and primary blanks recognised in the diacritical diagrams. Bladelets are identified as <12 mm wide laminar blanks. Despite the arbitrary cut-off, metrical data are showing a natural prevalence of blanks under the established threshold. Cores’ different morphologies, often cited as decisive in differentiating between technocomplexes, underlie the same focus on producing unipolar bladelets from narrow portions of the flaking surface. Bladelets are consistently identified as blanks exploiting convexities, while blades are more related to the shaping of the core convexities. Asymmetrical, twisted-in-profile blades are the most frequent blanks in management ones and are compatible with isolating narrow portions of the flaking surface. An integrated production of blade and bladelets might occur in the first stages, but bladelet production is dominant. No fundamental difference in bladelets-making strategies is detected among the three assemblages, therefore questioning former definitions of techno-complexes and their variability
Search of a graviscalar particle of the Randall-Sundrum model with the CMS experiment at LHC
No full textFrom the introduction: In the past ten years the four LEP experiments provided the best way to prove theoretical predictions in the framework of the Standard Model. All the collected data have been well described by theory and no room has been left for signal leading to new physics. However physicists never give up and they started to think about new models involving new concepts that can reproduce the experimental data and enlarge our understanding of the ultimate nature of fundamental interactions. Among these theoretical models, one of the most amazing new concept is, in my opinion, the introduction of extra spatial dimensions. These extra dimensions could explain some theoretical black points not yet fully understood, and provide a set of clear signatures that may be investigated at the greatest particle accelerator under construction: the Large Hadron Collider (LHC). LHC will provide the best possibilities to study any kind of signals that may lead to the discovery of new physiscs. In this thesis the candidate considers one of the most interesting consequences of the extra dimensions models: the existence of a new scalar particle. This particle (φ) interacts with all the other Standard Model particles and can mix with the Higgs boson, making much more interesting the study of the Higgs sector at LHC. In order to exploit in the best way the performance of the Large Hadron Collider, a detector, with extremely good reconstruction capabilities of the final states of hadron interactions, is needed. The Compact Muon Solenoid (CMS) has been designed for this purpose. The aim of this thesis is to understand if CMS will be sensitive to the decay of the new scalar particle into a pair of Higgs boson (φ →hh). In the first chapter of this thesis the theoretical framework of the extra dimensions is presented. After a short review of the principal ideas of the various models, the Randall-Sundrum one is presented with more details. The search for the new scalar particle has been studied, indeed, in this specific model. In the second chapter a schematic view of the Large Hadron collider is presented, with the main CMS subdetector: the tracker, the calorimeters, the magnet and the muon chambers. The use of the tracker to tag b and τ jets is very important for the analysis presented in this thesis. For this reason the subdetector is described in detail in the third chapter. At the end of the chapter a measurement of the dead time of the electronics of the tracker modules is presented. The candidate has performed this measurements at the CERN laboratories in collaboration with Jacopo Bernardini, Laurent Mirabito and Roger Grabit. The fourth chapter describes the CMS trigger strategies. The candidate has developped and implemented the isolation algorithm for the hadronic decays of the τ lepton, used as a filter in the High Level Trigger chain. This selection is of great importance in the study of the Higgs sector in CMS. In the last chapter the analysis of the process: gg → φ → hh is described with three different final states: • hh → ττ bb • hh → γγ bb • hh → bb bb. The candidate has studied in detail the final state with two τ leptons. The effects of possible systematical uncertainties on the knowledge of the background rate has been properly considered
The right sizing
No full textSince the 1990s, when EVAR was born, a continuous technological evolution of the materials has been eitnessed, as well as their improvement, in order to achieve higher performing endografts in terms of precise release, safer deployment and smaller-profile deliveries with the aim to tackle more and more complex iliac accesses. Following the EVAR evolution, the unimodular bifurcated endoprosthesis Endologix Powerlink, was the first to introduce the “anatomical fixation” concept. The latest version of this endograft is called AFX2. This device is simpler to deploy and, in the USA, it has been certified for percutaneous implant. This was possible thanks to the cooperation of the Italian Vascular Surgeons. Those who became familiar with this endograft have improved its indications, even in extreme cases such as the treatment of broken abdominal aortic aneurysms, complex anatomies for less suitable accesses, tight aortic carrefours and hostile proximal necks. This is a reference book written by expert vascular surgeons for fellow surgeons and students interested in extending their knowledge in EVAR treatment
Il Levallois laminare di Grotta di Fumane (VR) nel quadro del Musteriano Finale italiano
No full textIl lavoro di tesi si è concentrato sullo studio tecno-tipologico della catena operativa Levallois ricorrente unipolare delle due unità A11 e A10, appartenenti alla sequenza del Musteriano Finale di Grotta di Fumane (VR) e datati a >48 ka cal BP. L’analisi tecnologica mostra la presenza dell’intera catena operativa finalizzata all’ottenimento di supporti allungati di carattere laminare. Le misure tipometriche laminari si riscontrano durante tutta la catena operativa, in particolare per i supporti di piena produzione e i supporti ritoccati. Il confronto con altri siti della penisola italiana, che presentano catene operative unipolari Levallois datate al Musteriano Finale, mostra la particolarità delle unità A11 e A10 nella ricerca standardizzata di prodotti laminari
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
The Mousterian in North-Western Tuscany: new data from the Piano di Mommio sites [version 1; peer review: awaiting peer review]
No full textBackground
The Mousterian technocomplex is commonly associated with
Neanderthals and therefore serves as a proxy for their presence
across Europe. Stratified archaeological sites are the most informative
because they can yield information about artefacts' spatial distribution
and dating. Only a few of the Mousterian sites in Tuscany (Italy) met
these conditions and most of these sites are concentrated in the
North-Western region, with three specific sites situated in proximity to
the village of Piano di Mommio, on the slopes of a small river canyon.
Nevertheless, research on the sites stopped early on due to their small
extent and complete excavation, which does not allow for additional
fieldwork.
Methods
This article presents previously unpublished field notes, reports, and
images, which are then correlated with recent archaeological surveys.
Results
This combination of historical and contemporary data aims to provide
a more detailed understanding of the context in which the
assemblages at these sites were found. The insights gained from this
research shed light on the arrangement and positioning of artefacts
at these locations, offering valuable information to guide future
investigations on the assemblages.Conclusions
By enhancing our knowledge of Neanderthal presence in this region
through this interdisciplinary approach, this study contributes to a
better understanding of the Mousterian culture and the broader
narrative of human prehistory in Italy. It underscores the importance
of integrating historical field data with modern archaeological
techniques to advance our understanding of human history
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