1,721,090 research outputs found
Design, construction and monitoring of a building with deep basements in Rome
No full textExcavations for the construction of a tall building with deep basements in a congested area in Rome, close to the Tiber river, are described. The project was technically challenging due to the close proximity of existing buildings, the interaction with the river and the poor geotechnical
properties of the alluvial deposits. This well-documented case study addresses the geotechnical and structural issues involved in the development of the design and construction process.
Particular attention is focused on the prediction of excavation-induced displacements and on the efficiency of the water wells introduced to increase safety margins against the hydraulic uplift of the excavation bottom
Acute disseminated encephalomyelitis associated with hepatitis C virus infection
Full text linkBACKGROUND:
Acute disseminated encephalomyelitis (ADEM) is an autoimmune demyelinating disease of the central nervous system that is frequently preceded by an acute viral infection. This is the first reported case of ADEM associated with hepatitis C virus (HCV) infection.
CASE DESCRIPTION:
A 46-year-old woman underwent a surgical procedure and received multiple blood transfusions, at which time serologic testing for HCV was negative. Fifty days later, she suddenly developed seizures, alteration of consciousness, right hemiparesis, hemianopsia, and urinary retention. Magnetic resonance imaging revealed symmetric multifocal changes on T2-weighted images in the cerebral gray and white matter and in the cerebellar white matter with some lesion enhancement after gadolinium administration. Blood testing showed a recent HCV infection with high titer of IgM early antigens and a strongly positive reaction for HCV RNA. All other microbiological and virological test results were negative both in serum and in cerebrospinal fluid. Treatment with high-dose dexamethasone was followed by a dramatic improvement of the clinical and magnetic resonance picture. Within a few months the patient recovered completely and there were no relapses during 2 years of follow-up.
CONCLUSIONS:
Infection with HCV is associated with several autoimmune neurological manifestations. It is recommended the patients with ADEM be screened for HCV
Fragility assessment of wind-excited video screen rooms in high-rise buildings
No full textHigh-rise buildings with unusual shapes and high-technological systems are commonly used by companies to represent their economic power. In many cases, equipment consisting of LED screen walls is frequently not compatible with wind-induced displacements and accelerations experienced at high floors. The aim of the research work is to design and optimize a control device for response reduction of a prismatic room equipped with LED screen walls on all sides. The control system is a passive sliding device located at the base of the room disconnecting the LED supporting frame from the building's floor. Fragility analysis is carried out to compute the probability of exceeding predetermined displacements and acceleration thresholds with and without the control system
Fragility assessment of wind-excited video screen rooms in high-rise buildings
No full textHigh-rise buildings with unusual shapes and high-technological systems are commonly used by companies to represent their economic power. In many cases, equipment consisting of LED screen walls is frequently not compatible with wind-induced displacements and accelerations experienced at high floors. The aim of the research work is to design and optimize a control device for response reduction of a prismatic room equipped with LED screen walls on all sides. The control system is a passive sliding device located at the base of the room disconnecting the LED supporting frame from the building's floor. Fragility analysis is carried out to compute the probability of exceeding predetermined displacements and acceleration thresholds with and without the control system
Wind-induced vibration mitigation of video screen rooms in high-rise buildings
No full textVideo walls, made of closely spaced video screen systems, are currently very used in architecture and interior design applications. To have a continuous image, the gaps between the screens must be limited as much as possible and the vibration of the supporting structure must be reduced to avoid ponding and consequent screens damage. The problem is particularly important when video walls are in rooms inside high-rise buildings that, due to their high deformability, experience significant wind-induced drifts and accelerations. In this case, it is convenient to mount video screens on a three-dimensional lightweight frame substructure (video wall room), supported by the building's floor. To ensure the limitation of the relative displacements between the screens in case of strong winds, the substructure can be equipped with base isolators capable of mitigating the global response when the buildings' induced accelerations overcome specific thresholds. This paper is aimed at investigating the wind-induced response of video screen rooms located inside wind-excited high-rise buildings and at providing guidance for the design of the base isolation devices. The floors' accelerations measured during aeroelastic wind tunnel tests on a high-rise building are applied as base accelerations to a finite element method model of the video room. The parameters of the constitutive behavior of the base isolation system are optimally calibrated as a function of the wind speed and position over the building height
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
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