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Evaluación de cojinetes de deslizamiento basada en la norma ISO 7902:2020 / Evaluation of plain bearing performance according to standard ISO 7902:2020
No full textResumen: Evaluación de cojinetes de deslizamiento basada en la norma ISO 7902:2020 Evaluation of plain bearing performance according to standard ISO 7902:2020 Resumen La norma ISO 7902: Hydrodynamic plain journal bearing under steady-state conditions – Circular cylindrical bearings, es empleada ampliamente para la evaluación de cojinetes en diferentes condiciones de trabajo. En Cuba se ha usado el procedimiento propuesto por este documento, para evaluar cojinetes en diferentes condiciones de trabajo y sectores económicos, tanto por investigadores vinculados a la Universidad Tecnológica de La Habana, como en proyectos de otras universidades. El objetivo de esta investigación es evidenciar la actualidad y facilidad de aplicación de la norma ISO 7902. En el presente trabajo se expone el estudio de la tercera edición del procedimiento de cálculo de la norma del año 2020, para la simulación de un apoyo de un generador HSR7 637-8P de un motor Hyundai Himsen 9H 25/33 de una central eléctrica de fuel-oíl, obteniéndose resultados similares a las condiciones reales de operación. Se puede afirmar que se cuenta con una herramienta para prever los efectos que puedan ser provocados por acciones de control sobre el cojinete, modificación de las condiciones de trabajo y variaciones en el diseño. Palabras claves: norma ISO 7902; lubricación hidrodinámica; espesor de película de lubricante. Abstract: The international standard ISO 7902: Hydrodynamic plain journal bearing under steady-state conditions – Circular cylindrical bearings, is widely used for the evaluation of plain bearings in different operation conditions. In Cuba, the procedure proposed by this document has been used to evaluate plain bearings in different working conditions and productive sectors of the national economy, both by Universidad Tecnológica de La Habana researchers, and from other universities. The objective of this research is to demonstrate the relevance and feasibility of applying ISO 7902 standard. In this work research, a study of the load capacity calculation for plain bearings, according to the third edition of ISO standard 7902: 20202 is presented. The mentioned procedure was used to simulate the operating conditions and work capacity of a plain bearing support in an HSR7 637-8P generator of a Hyundai Himsen 9H 25/33 engine in a fuel-oil thermal power plant. The results show evidence of similarity between the simulation and the real operating conditions in the plain bearing. In this work, it could be concluded ISO standard 7902:2020 allows establishing a feasible procedure to apply to prevent the effects caused by control actions, working conditions and modification in the design of plain bearing. Key words: ISO 7902 standard; hydrodynamic lubrication, lubricant; film thickness.</p
NS H 7902, hibrid suncokreta (Ukrajina)
No full textNS H 7902, hibrid suncokreta, priznat od strane Ministarstva za poljoprivredu Ukrajine (Міністерство аграрної політики та продовольства України), rešenje Državne komisije za zaštitu biljnih sorti (Державна служба з охорони прав на сорти рослин) br. 17039153 od 11.02.2020. godine, Ukrajina
[South African Railways & Harbours, Engine Drawing Card, Sketch No. 7902]
No full textThis engine drawing card was created for South African Railways & Harbours, Class 14-34 1/4 E. Section H-14 1/4 E. Sketch 7902. Copy Spec. 27F-40
Utjecaj interneta i internetskih društvenih mreža na stavove i odluke o cijepljenju (HRZZ IP-2019-04-7902) - Plan upravljanja istraživačkim podatcima
No full textPlan upravljanja istraživačkim podatcima za projekt Utjecaj interneta i internetskih društvenih mreža na stavove i odluke o cijepljenju, financiran od strane Hrvatske zaklade za znanost (HRZZ IP-2019-04-7902
Utjecaj interneta i internetskih društvenih mreža na stavove i odluke o cijepljenju (HRZZ IP-2019-04-7902) - Plan upravljanja istraživačkim podatcima
No full textPlan upravljanja istraživačkim podatcima za projekt Utjecaj interneta i internetskih društvenih mreža na stavove i odluke o cijepljenju, financiran od strane Hrvatske zaklade za znanost (HRZZ IP-2019-04-7902
California Poll: 7902 -- May 3-15, 1979
No full textThe Field Poll, established in 1945 as The California Poll by Mervin Field, has operated continuously as an independent, non-partisan, media-sponsored public opinion news service. Each year the Field Polls cover a wide range of political and social topics examining California public opinion. Continuing measures are made of voter support for leading political figures vying for major state and federal offices, job ratings of important political figures and reactions to significant political events. Voter awareness, understanding and predispositions of major campaign issues and salient statewide ballot propositions are also tracked over time. For poll 7902 N=979
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
No full text“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
No full textWe 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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