1,721,005 research outputs found
A very efficient medical information solution improving the assisted ventilation of Intensive Care Unit patients
No full textTelemedicine and home care applications
No full textPortable biomedical devices for health care management are producing a great impact in the monitoring of patients located in areas different from clinical environments such as houses, military bases, ships, and the like. A number of applications, ranging from data collection, to chronic patient surveillance, and even to the control of therapeutic procedures, are being implemented in many parts of the world. The development of portable devices for telemedicine is accelerated by new technologies such as wireless transmission, GPS (Global Positioning System) receivers, Internet applications and GSI (Giga Scale of Integration) of electronic devices. In recent decades the development of portable biomedical devices has led to the presentation of numerous patents. The aim of this paper is to review some of these patents, with emphasis on the possibilities of patients remote monitoring, providing all necessary information in real-time from their homes to the health facility. Thus the specialist can make his diagnosis from the hospital. This is the new concept of home care
The Regge limit of AdS<inf>3</inf> holographic correlators
No full textWe study the Regge limit of 4-point AdS3× S3 correlators in the tree-level supergravity approximation and provide various explicit checks of the relation between the eikonal phase derived in the bulk picture and the anomalous dimensions of certain double-trace operators. We consider both correlators involving all light operators and HHLL correlators with two light and two heavy multi-particle states. These heavy operators have a conformal dimension proportional to the central charge and are pure states of the theory, dual to asymptotically AdS3× S3 regular geometries. Deviation from AdS3× S3 is parametrised by a scale μ and is related to the conformal dimension of the dual heavy operator. In the HHLL case, we work at leading order in μ and derive the CFT data relevant to the bootstrap relations in the Regge limit. Specifically, we show that the minimal solution to these equations relevant for the conical defect geometries is different to the solution implied by the microstate geometries dual to pure states
The CFT6 origin of all tree-level 4-point correlators in AdS3 x S3
Full text link© 2020, The Author(s). We provide strong evidence that all tree-level 4-point holographic correlators in AdS 3× S3 are constrained by a hidden 6D conformal symmetry. This property has been discovered in the AdS 5× S5 context and noticed in the tensor multiplet subsector of the AdS3× S3 theory. Here we extend it to general AdS3× S3 correlators which contain also the chiral primary operators of spin zero and one that sit in the gravity multiplet. The key observation is that the 6D conformal primary field associated with these operators is not a scalar but a self-dual 3-form primary. As an example, we focus on the correlators involving two fields in the tensor multiplets and two in the gravity multiplet and show that all such correlators are encoded in a conformal 6D correlator between two scalars and two self-dual 3-forms, which is determined by three functions of the cross ratios. We fix these three functions by comparing with the results of the simplest correlators derived from an explicit supergravity calculation
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
Accurate modelling of microwave PBG-based Devices for Particle Accelerator Design
No full textWe present an accurate numerical model very useful to design Photonic Band-Gap (PBG) based particle accelerators for cancer hadrontherapy. The approach, based on the Floquet-Bloch theory, allows to investigate without approximations the propagation of a wave inside a periodic structure. Simulations run very quickly providing the geometrical dimensions, the forbidden frequency range, the propagation constants, the total field distribution and the modal losses
Derivation of fragility curves from non linear dynamic analyses for URM school buildings
No full textFragility curves constitute an essential tool in risk studies. Together with the hazard representation and exposed assets databases, they are used to provide an estimate of physical or economic losses. This is typically achieved by introducing consequence functions, which correlate the probability of reaching specific damage levels (DL) – estimated via the fragility curves – with the losses under consideration. Although the physical meaning of DL is well established in engineering practice and various references are available in the literature and shared by the scientific community (like the damage grades and definition introduced by the European Macroseismic Scale), the ways adopted in mechanical-analytical, mechanical-numerical and empirical approaches for converting these principles and thus deriving fragility curves are multiple. That constitutes uncertainty in risk studies which still lacks a consensus on the scientific literature. In this context, the paper explores converting and interpreting the huge amount of data provided by three-dimensional models analysed through nonlinear dynamic analyses (NLDA) into synthetic DLs. One of the main novelties of the procedure is that, differently from the most common approach in numerical methods, it does not require the introduction of inter-storey or roof drift thresholds – conventionally defined a priori – to associate the attainment of DLs. The paper focuses on existing unreinforced masonry (URM) buildings. Specifically, seven different URM structures, inspired by real schools, are analysed adopting the equivalent frame modelling approach. The software package adopted – i.e. Tremuri – has been extensively validated in strong nonlinear range in previous research. The analysed buildings were selected based on their comprehensive documentation of geometric and mechanical characteristics, but the methodology applied has general validity. A Cloud-based approach, refined through the combined use of Incremental Dynamic Analyses is adopted to derive the fragility curves, which are compared with other references available in the literature. The proposed approach revealed quite effective and replicable. Moreover, the results gathered through accurate NLDAs are also processed to establish reference values of inter-storey or roof drift thresholds to be used in more simplified approaches (e.g. based on the use of SDOFs system or mechanical-analytical models)
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