1,720,958 research outputs found
Research on a bus frame with fiberglass elements
No full textDisertacijoje nagrinėjama autobuso rėmo konstrukcija, kuri gaminama naudojant inovatyvias, bendrą transporto priemonės masę mažinančias medžiagas. Vienas iš pagrindinių uždavinių, sprendžiamų disertacijoje, yra konstrukcijos saugumo
įvertinimas atliekant vertimo ir šoninio smūgio skaitinį modeliavimą, paremtą baigtinių elementų metodu ir natūriniais eksperimentais. Darbe taip pat įvertinamas dinaminių parametrų kitimas, keleivių komfortas, atliekama lyginamoji rezultatų analizė.
Disertaciją sudaro įvadas, keturi skyriai, bendrosios išvados, naudotos literatūros, autoriaus publikacijų disertacijos tema sąrašai ir septyni priedai.
Įvadiniame skyriuje aptariama tiriamoji problema ir darbo aktualumas. Aprašomas tyrimų objektas, formuluojamas darbo tikslas ir uždaviniai, pateikiama tyrimų metodika, darbo mokslinis naujumas, darbo rezultatų praktinė reikšmė, ginamieji teiginiai. Įvado pabaigoje pristatomos disertacijos tema autoriaus paskelbtos publikacijos ir pranešimai konferencijose bei disertacijos struktūra.
Pirmajame skyriuje apžvelgiami moksliniai darbai disertacijos tema. Pateikiama autobuso rėmo konstrukcijos saugumą užtikrinančių reikalavimų analizė. Apžvelgiama, kokios priemonės taikomas transporto priemonių masei mažinti ir saugumui užtikrinti.
Antrajame skyriuje pateikiami inovatyvios, stiklo pluoštu armuoto polimero kompozitinės medžiagos, kuri pagaminta pultruzijos būdu, mechaninių savybių nustatymo bandymų rezultatai, lyginamos skirtingos medžiagos. Naudojantis
Ansys Workbench programa suvedamos eksperimentiniais bandymais nustatytos medžiagos savybės.
Trečiajame skyriuje pateikiami skaitiniai modeliai, taikomi modeliuojant autobuso rėmo konstrukciją dinamikoje. Atliekant skaitinį modeliavimą, įvertinami ir palyginami skirtingų konstrukcijų parametrai.
Ketvirtajame skyriuje pateikiami autobuso rėmo konstrukcijos stiprumui ir dinaminėms charakteristikoms įvertinti naudota įranga, eksperimentinio tyrimo atlikimo metodika, natūrinių eksperimentinių bandymų rezultatai, palyginami skaitinio modeliavimo ir eksperimentiniai rezultatai.
Disertacijos tema paskelbti devyni moksliniai straipsniai: keturi – mokslo žurnaluose, įtrauktuose į Clarivate Analytics Web of Science duomenų bazę, du – kitų tarptautinių duomenų bazių mokslo žurnaluose, vienas – recenzuojamose periodiniuose ir vienkartiniuose leidiniuose, du – recenzuojamuose konferencijų straipsnių rinkiniuose.Daktaro disertacij
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
The analysis of deformations of the frame in a basic minibus and a low floor minibus
No full textIn the paper, the structures of frames and the meth-ods for calculation of their resistance are reviewed. A frame of a basic minibus and a frame of a low floor minibus are examined and analyzed herein. Computer-aided modeling of the frames are carried out. The structures of the frames are assessed while simulating their deformations caused both by frontal and lateral impacts against the frames. In ad-dition, tensions, deflections and deformations appeared in the frames were assessed and compared
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
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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