1,720,986 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Modelling the dynamics of domestic low-temperature heat pump heating systems for improved performance and thermal comfort : a systems approach
No full textThe present environmental concerns and the rising human requirement for solutions with better comfort and lower costs have resulted in an increased awareness for the energy use in the built environment. Technical advances in building structural systems and materials, heating and other comfort-providing systems and controlling strategies all lead to the integration of building technology with the function of buildings and the aesthetics. Therefore, in the process of improving the performance of energy systems and increasing the energy efficiency, integrated system approaches are of high importance. Performing the necessary energy analysis before any construction-installation occurs can help designers and decision makers reach guided solutions. Hence, a broad range of calculation tools for evaluating the operation of energy systems and the controls in buildings have been developed the latest years with different levels of complexity and angles of focus. However, research and development regarding holistic energy system designs and techniques are in their infancy. The standard tactic has been to isolate system parts, study them as stand-alone sub-systems and focus on optimising components or processes of a complex function. In the present study, it is demonstrated the necessity for uniting energy engineers, architects, installers and technicians regarding decision making upon the energy use for heating, ventilation and air-conditioning (HVAC) in the built environment. Systems approach has been employed for studying the research issue that is presented in the current thesis. An extended part of this treatise has been devoted to systems thinking in practice. The thesis demonstrates systematic methods of modelling and analysing certain, integrated, domestic, HVAC applications. The reference system boundaries enclose the building as a construction and as a dynamic function, a comfort-providing system based on a heat pump, a low-temperature hydronic heat distribution system and controls in a residential application. Obviously, these are not the only components met in a hydronic heating system. Numerous pieces of equipment, as piping, circulating pumps, expansion tanks, zone valves, relief valves and other essential elements are needed to make a safe and functional heating system. However, this study focuses on the analysis of the chosen reference system. Several models have been developed in the computational tools of TRNSYS and EES. These tools have been employed because they allow co-solving, hence the integrated system as well as the interaction between the different parts of the system can be studied. The foremost result of this study is that approaching the system as a whole provides a better picture of the operation of every system component and the interaction between them. Explanations are given for the parameters that have a significant impact on the system’s performance. The thesis shows the importance of factors that are not easy to predict, as well as the difference in the building’s behaviour under fast changing thermal loads when the incorporated thermal mass is altered. Finally, implementing sophisticated controls for reducing the energy costs without compromising thermal comfort is vital.QC 2010100
Variations on the Author
Get PDF“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
Get PDFWe 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
Get PDFWe 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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
EXPERIMENTAL AND EPIDEMIOLOGICAL INVESTIGATION OF POSSIBLE EFFECTS OF FLUORIDE ON MICROBIAL PLAQUE ACCUMULATION AND GINGIVAL INFLAMMATION
No full textIN THE PRESENT STUDY THE INFLUENCE OF FLUORIDE ON CLINICAL INDICES OF GINGIVAL INFLAMMATION AND PLAQUE FORMATION WAS INVESTIGATED. FOR THIS PURPOSE: 1. THE "EXPERIMENTAL GINGIVITIS" MODEL AS DESCRIBED BY LOE AND COWORKERS WAS APPLIED IN 16 VOLUNTEERS, WHICH REPLACED ANY DAILY ORAL HYGIENE MEASURES WITH 0 .1% SNF2 AND 0.05% NAF TWICE DAILY MOUTHRINSES. 2. 450 CHILDREN 6 -15-YEARS OLD BORN AND RESIDING IN FOUR AREAS WITH NATURALLY FLUORIDATED WATER (1.4-11.4 PPMF) WERE EXAMINED. THE GINGIVAL AND PLAQUE INDICES (G.I., P1.I.) OF THESE CHILDREN WAS COMPARED TO THOSE OF 266 CHILDREN OF THE SAME AGE GROUP, BORN AND RESIDING IN A FLUORIDE AREA (0.1-0.2 PPMF). THE FINDINGS FROM THE FIRST PART OF THE PRESENT STUDY SHOW AN ANTIPLAQUE EFFECT OF 0.1% SNF2 MOUTHRINSES. THIS ANTIPLAQUE EFFECT PREVENTS CONSEQUENTLY THE OCCURENCE OF GINGIVAL INFLAMMATION. THE FINDINGS FROM THE SECOND PART OF THE PRESENT STUDY, INDICATE THAT FLUORIDE IN WATER, EVEN AT HIGH CONCENTRATIONS (1.4-11.4 PPMF) DOES NOT EFFECT THE CLINICAL INDICES OF GINGIVAL INFLAMMATION AND PLAQUE CONCENTRATION.ΣΤΗΝ ΕΡΓΑΣΙΑ ΑΥΤΗ, ΔΙΕΡΕΥΝΗΘΗΚΕ Η ΕΠΙΔΡΑΣΗ ΤΟΥ ΦΘΟΡΙΟΥ ΣΤΟΥΣ ΚΛΙΝΙΚΟΥΣ ΔΕΙΚΤΕΣ ΤΗΣ ΦΛΕΓΜΟΝΗΣ ΤΩΝ ΟΥΛΩΝ ΚΑΙ ΤΗΣ ΣΥΓΚΕΝΤΡΩΣΗΣ ΜΙΚΡΟΒΙΑΚΗΣ ΠΛΑΚΑΣ. ΓΙΑ ΤΟΝ ΣΚΟΠΟ ΑΥΤΟ: 1) ΕΦΑΡΜΟΣΘΗΚΕ ΤΟ ΜΟΝΤΕΛΟ ΠΕΙΡΑΜΑΤΙΚΗΣ ΟΥΛΙΤΙΔΑΣ ΤΟΥ LOE ΚΑΙ ΤΩΝ ΣΥΝΕΡΓΑΤΩΝ ΤΟΥ ΣΕ 16 ΕΘΕΛΟΝΤΕΣ, ΠΟΥ ΑΝΤΙΚΑΤΕΣΤΗΣΑΝ ΤΑ ΣΥΝΗΘΗ ΜΕΣΑ ΣΤΟΜΑΤΙΚΗΣ ΥΓΙΕΙΝΗΣ ΜΕ ΣΤΟΜΑΤΟΠΛΥΣΕΙΣ ΦΘΟΡΙΟΥΧΟΥ ΚΑΣΣΙΤΕΡΟΥ 0.1% ΝΑΤΡΙΟΥ 0.05% ΚΑΙ 2) ΕΞΕΤΑΣΘΗΚΑΝ 450 ΠΑΙΔΙΑ ΗΛΙΚΙΑΣ 6-15 ΕΤΩΝ ΠΟΥ ΓΕΝΝΗΘΗΚΑΝ ΚΑΙ ΖΟΥΝ ΣΥΝΕΧΩΣ ΣΕ ΤΕΣΣΕΡΕΙΣ ΠΕΡΙΟΧΕΣ ΜΕ ΦΥΣΙΚΑ ΦΘΟΡΙΩΜΕΝΟ ΝΕΡΟ ΣΕ ΠΕΡΙΕΚΤΙΚΟΤΗΤΕΣ 1.4-11.4 PPMF. ΣΤΑ ΠΑΙΔΙΑ ΑΥΤΑ, ΚΑΤΑΓΡΑΦΗΚΑΝ Ο ΟΥΛΙΚΟΣ ΔΕΙΚΤΗΣ ΚΑΙ Ο ΔΕΙΚΤΗΣ ΠΛΑΚΑΣ ΚΑΙ ΣΥΓΚΡΙΘΗΚΑΝ ΜΕ ΕΚΕΙΝΟΥΣ 266 ΠΑΙΔΙΩΝ ΤΗΣ ΙΔΙΑΣ ΗΛΙΚΙΑΣ ΠΟΥ ΠΡΟΕΡΧΟΝΤΑΙ ΑΠΟ ΜΙΑ ΠΕΡΙΟΧΗ ΜΕ ΑΜΕΛΗΤΕΑ ΠΕΡΙΕΚΤΙΚΟΤΗΤΑ ΤΟΥ ΝΕΡΟΥ ΣΕ ΦΘΟΡΙΟ (0.1-0.2 PPMF). ΤΑ ΕΥΡΗΜΑΤΑ ΤΟΥ ΠΕΙΡΑΜΑΤΙΚΟΥ ΜΕΡΟΥΣ ΤΗΣ ΕΡΕΥΝΑΣ ΔΕΙΧΝΟΥΝ ΠΩΣ ΟΙ ΣΤΟΜΑΤΟΠΛΥΣΕΙΣ ΜΕ ΔΙΑΛΥΜΑ ΦΘΟΡΙΟΥΧΟΥ ΚΑΣΣΙΤΕΡΟΥ 0.1% ΕΙΝΑΙ ΑΠΟΤΕΛΕΣΜΑΤΙΚΕΣ ΚΑΤΑ ΤΟΥ ΣΧΗΜΑΤΙΣΜΟΥ ΜΙΚΡΟΒΙΑΚΗΣ ΠΛΑΚΑΣ ΚΑΙ ΚΑΤΑ ΣΥΝΕΠΕΙΑ ΣΤΗΝ ΕΜΦΑΝΙΣΗ ΦΛΕΓΜΟΝΗΣ ΣΤΑ ΟΥΛΑ ΣΤΗΝ ΠΕΙΡΑΜΑΤΙΚΗ ΟΥΛΙΤΙΔΑ. ΤΑ ΕΥΡΗΜΑΤΑΤΟΥ ΕΠΙΔΗΜΙΟΛΟΓΙΚΟΥ ΜΕΡΟΥΣ ΔΕΙΧΝΟΥΝ ΠΩΣ ΤΟ ΦΘΟΡΙΟ ΣΤΟ ΠΟΣΙΜΟ ΝΕΡΟ ΕΣΤΩ ΚΑΙ ΣΕ ΥΨΗΛΕΣ ΑΛΛΑ ΜΗ ΤΟΞΙΚΕΣ ΠΕΡΙΕΚΤΙΚΟΤΗΤΕΣ ΔΕΝ ΦΑΙΝΕΤΑΙ ΝΑ ΕΠΗΡΕΑΖΕΙ ΤΟΥΣ ΚΛΙΝΙΚΟΥΣΔΕΙΚΤΕΣ ΤΗΣ ΦΛΕΓΜΟΝΗΣ ΤΩΝ ΟΥΛΩΝ ΚΑΙ ΤΗΣ ΣΥΓΚΕΝΤΡΩΣΗΣ ΜΙΚΡΟΒΙΑΚΗΣ ΠΛΑΚΑΣ
Influence of the Design Criteria on the Operation of a Domestic Heat Pump Heating System
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