1,720,973 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
Design of Selected Parts of Machinery in WWTP focused on Improving Hydraulic Efficiency
No full textThe wastewater treatment process is one of the most important processes which contributes to the protection of the environment. This process can also potentially recover necessary and scarce raw materials, such as phosphorus. Research of the wastewater treatment technology is an increasingly relevant topic and more innovative knowledge should be gradually implemented into existing plants. However, the implementation of such technology involves increased investment and often operating costs. This is, why there is a growing interest in improving the energy intensity and hydraulic efficiency of the installed wastewater plant machinery. The optimization of operating parameters in such machinery can also bring significant savings, which can be potentially re-invested into other technologies. This work deals with the issue of proper evaluation of installed machinery for the selection of operating parameters and assessment of their significance. As the challenge, wastewater treatment technology is very sensitive towards the combination of technological equipment and incorrect operational parameters can lead to erroneous evaluation of the efficiency of individual equipment or inappropriate engineering proposals. To eliminate these risks, an analytical procedure for the selection and evaluation of parameters is proposed in this work. This procedure is demonstrated on six types of equipment. To verify the conclusions of the proposed procedure, a model design of the equipment was performed, in which the influence of individual parameters was concisely assessed. By using the data, the proposed procedure could be validated more specifically. In this work, the necessary data for the design was obtained by experimental research and extensive testing. The results confirm the practical applicability of the proposed procedure
Integrated solution of waste gas-to-energy unit
No full textWaste Gas-to-Energy (WGtE) units allow the thermal processing of gaseous waste and its simultaneous energy recovery. However, the operation of WGtE units involves a large consumption of external fuel, and the flue gases produced require the application of flue gas cleaning technology. This thesis presents the results of a study focused on the topic of integrated WGtE unit design, which is an effective approach for achieving external fuel consumption savings while minimizing investment costs. Firstly, it presents the developed analytical method for the design of technological modifications of existing WGtE units treating waste gases in order to achieve their economical and more environmentally friendly operation. Attention is mainly paid to the description of the developed mathematical relations and graphical tools that can be used by the professional community, especially by the operators of WGtE units. To further reduce the negative environmental impact of these units, the second area addressed in the thesis is the development of flue gas cleaning equipment for the reduction of nitrogen oxides concentration. In addition to the technological concept and design of this device, the results of experimental work in laboratory and industrial environment are presented, where the great potential of using these devices in WGtE units as well as in a wide range of other industrial combustion plants was confirmed
Integrated solution of waste gas-to-energy unit
No full textWaste Gas-to-Energy (WGtE) units allow the thermal processing of gaseous waste and its simultaneous energy recovery. However, the operation of WGtE units involves a large consumption of external fuel, and the flue gases produced require the application of flue gas cleaning technology. This thesis presents the results of a study focused on the topic of integrated WGtE unit design, which is an effective approach for achieving external fuel consumption savings while minimizing investment costs. Firstly, it presents the developed analytical method for the design of technological modifications of existing WGtE units treating waste gases in order to achieve their economical and more environmentally friendly operation. Attention is mainly paid to the description of the developed mathematical relations and graphical tools that can be used by the professional community, especially by the operators of WGtE units. To further reduce the negative environmental impact of these units, the second area addressed in the thesis is the development of flue gas cleaning equipment for the reduction of nitrogen oxides concentration. In addition to the technological concept and design of this device, the results of experimental work in laboratory and industrial environment are presented, where the great potential of using these devices in WGtE units as well as in a wide range of other industrial combustion plants was confirmed
Development of Methodology for Evaluating the Necessity of Shell Compensators fo Tubular Condensers
No full textThis dissertation deals with strength analysis of shell and tube condenser with fixed tube sheet, which is equipped with shell expansion joint. The main aim of this thesis is to develop a methodology for determining of necessity of uses the expansion joint on the shell and tube condenser, while maintaining the safety and reliability of the equipment during operation, based on thermal-hydraulic and strength analyses. Industrial condenser is used as a safety equipment during the operation, therefore special attention is paid to the start-up process. The condenser start-up process is investigated by a number of transient strength and transient thermal analyses, which was solved by specialized software and with analytical calculations. The strength calculation of shell, tube and tube-sheet of shell and tube condenser is developed in detail according the ČSN EN 13445 standard with special attention to shell and tube process media thermal impact on condenser construction. Based on the performed calculations, the methodology for evaluating the necessity of shell expansion joints of tubular condensers was developed
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
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No full textComputational modeling of flow distribution in process equipment
No full textFluid flow distribution; heat flux distribution; computational modelling; analytical model; CFD; matrix approach; composite modelling system; heat transfer equipment; convection section; cross flow; dividing manifold; design optimizatio
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