1,721,076 research outputs found
Projectile vomiting and Valsalva-like abdominal contractions as an uncommon presentation of supraventricular tachycardia in an infant
No full textParoxysmal supraventricular tachycardia (PSVT) is a prevalent pediatric arrhythmia. Neonatal and infantile-onset presentation is unspecific, thus making differential diagnosis essential in not delaying crucial intervention. We here describe the case of an undetected PSVT in an infant performing repeated abdominal contractions, thus presenting with projectile vomiting. At an early stage of tachycardia, infants are probably able to unconsciously attempt and succeed to terminate acute episodes by strengthening vagal stimulation in the form of Valsalva-like abdominal contractions, but only up to a point. As PSVT progresses, heart failure may develop. Early recognition and treatment are therefore required to minimize negative outcomes
Sustainable Design of Temporary Buildings in Emergency Situations
Full text linkUnforeseen circumstances that occur anywhere in the world following natural disasters, humanitarian and health emergencies, armed conflicts, or in the presence of migratory flows, require adequate and immediate responses. This work aims to analyze the project requirements useful to realizing modular systems for residential, multifunctional, and hospital intended use, which, even if temporary, can ensure a high-performance standard in terms of comfort and energy efficiency, and at the same time guarantee the possibility of use in the widest possible range and in rapid execution times. The considered requirements have been those of settlement in the territory, energy efficiency, transportability, and re-usability. Temporary modular systems put in place with the abovementioned requirements are the basis of the design proposal; to realize this, they are made with dry technology to be reusable and energy-efficient. Furthermore, this enables the reduction of the minimum modules’ production and times of execution in applying both requirements of standardization and modular coordination. All these requirements also add to the ones relating to energy efficiency, transportability, and reusability, which are the pillars of the project for the achievement of performance above all in terms of standards and comfort levels as it is possible to find in the sustainable building of the living period
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
Boosting solar accessibility and potential of urban districts in the Nordic climate: A case study in Trondheim
No full textThe harvesting of solar energy still encounters many barriers in Scandinavia. This paper proposes a set of solar urban planning recommendations to enhance the solar accessibility and potential and thereby increase the energy production from integrated solar active systems installed in a Nordic urban environment. In this work, solar analyses using DIVA-for-Rhino were conducted on two typical Norwegian residential housing types, row houses and high-rise apartment blocks, to maximize their solar potential in an isolated scenario and to evaluate the contributions of indirect mutual solar reflections created by the urban surroundings. The effect of the buildings' orientation, the finishing materials of the buildings' facades, and,the ground soil on solar potential have been estimated in geometrically simplified urban districts. The numerical outcomes observed were transferred into solar urban planning recommendations that were applied to the task of developing the masterplan of the Ovre Rotvoll district, located in Trondheim, Norway. Simulations were run (i) to apply and evaluate the solar urban planning recommendations, (ii) to optimize the district morphology, and (iii) to localize the most suitable surfaces for installing integrated solar active systems. The results demonstrated that by optimizing the urban morphology (e.g., orientation, building height and distance between buildings) and choosing the finishing materials (e.g., colors and materials of the facades and the ground soil) from the early design phases, the solar potential can be increased by up to 25% and the energy yield from the integrated solar active systems can provide up to 55% of the total primary energy demand of an entire urban district, even in a Nordic climate
Direct Data-Driven Control of Cavity Tuners in Particle Accelerators
No full textX-Ray Free Electron Lasers (XFELs) are the next generation of X-rays sources delivering dramatical improvements over synchrotron radiation in terms of brilliance, pulse length and coherence. While obtaining such X-ray radiations, the high gradients of the accelerating electromagnetic field, external vibrations and pressure fluctuations may cause deformations of the cavities where the electrons are accelerated. This lowers the efficiency of the linear accelerator (linac) and degrades the beam quality. To contrast this phenomenon, known as "detuning", suitable mechanical compensators of cavity deformations are needed. In this paper, we propose a direct data-driven approach for the synthesis of such systems, as an alternative to the on-line iterative methods currently in use. The effectiveness of the proposed approach is shown on a complex linac simulator. (C) 2018, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved
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
The use of cool pavements for the regeneration of industrial districts
Full text linkIndustrial districts are characterized by the presence of low and extensive building volumes and by predominantly sealed, impermeable surfaces, which contribute to several environmental problems and to the deterioration of outdoor human thermal comfort conditions, especially during summer hot days. To tackle these issues, this study proposes an approach for the regeneration of industrial districts based on the application of cool materials. Reflective and evaporative pavements were selected as suitable solutions to reduce summer overheating, while ensuring the functionality required by the industrial production, and contributing to stormwater management. The effectiveness of the approach was tested in a portion of the industrial district of Padua (Italy). In summer conditions, the replacement of conventional pavements with cool materials results in a reduction of the ground surface temperatures up to 14.0 °C and a consequent decrease of the air temperature at pedestrian level between 0.6 and 1.2 °C. The effects of human thermal comfort conditions highly depend on the selected cool material and on the morphology of the urban canyon. Finally, the reduction of external surface and air temperatures also contributes in cooling indoor spaces (average decrease from 1.0 to 2.5 °C), with impacts on the energy efficiency of the industrial buildings
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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