1,722,465 research outputs found
Chaos In Saw Map
No full textWe consider the dynamics of a scalar piecewise linear "saw map" with infinitely many linear segments. In particular, such maps are generated as a Poincare map of simple two-dimensional discrete time piecewise linear systems involving a saturation function. Alternatively, these systems can be viewed as a feedback loop with the so-called stop hysteresis operator. We analyze chaotic sets and attractors of the "saw map" depending on its parameters.School of Natural Sciences and Mathematic
Unmanned aerial vehicles as an efficient platform to enable agriculture's digital future
No full textIgnatyev, Dmitry I. - Associate SupervisorThe potential for Unmanned Aerial Vehicles to revolutionise agriculture,
particularly small-scale farms, is enormous. Today, most agriculture UAVs are
bulky, expensive, and primarily designed for heavy-lift applications, making them
unaffordable for most small-scale farmers. Despite the availability of smaller
UAVs, they were not designed for agricultural purposes, and have limited
endurance. This project presents an innovative solution that involves integration
of cylindrical Li-ion cells into the multirotor’s airframe structure, thereby cost-
effectively enhancing endurance. Through the proposed engineering design
approach, a prototype UAV is built and tested, demonstrating a significant
endurance improvement over similarly sized vehicles powered by LiPo batteries.
This design presents a budget friendly solution that could enable small-scale
farmers to take advantage of affordable UAV technology.MSc by Research in Aerospac
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
Increasing supply chain resilience through efficient redundancy allocation: A risk-averse mathematical model
Full text linkThe COVID-19 pandemic has created significant uncertainty in all areas of life, including supply chains (SCs). This paper presents a new risk-averse mixed-integer nonlinear problem mathematical model for the design and planning of a two -echelon resilient SC network. Disruption events, which can partially or completely reduce the available capacity, are included in the model. The model's objective is to minimise the total costs by determining the optimal facility location and capacity, allocation flows and resilience actions for hedging against disruption risk. A solution procedure is tested through computational experiments, and managerial insights were formed based on a numerical example for several disruption configurations, with a specific case of long-term crises similar to the COVID-19 pandemic. The results showed that recovery activities are the most efficient actions to take for a short-term disruption event. Besides, proactive resilience investment in a protection system and flexibility enhancement allows the SC to handle the disruption period with a limited increase in network building costs and overcapacity. Copyright (C) 2021 The Authors
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
False Dmitry I in Russian Historiography of the 19th and Early 20th Century
No full textThe bachelor thesis focuses ona detailedanalysis of the evaluationof False DmitryI.inRussian historiographyof the 19th and beginning of the 20th centuries,i.e.in the period when historical scholarship in Russia established itself as a professional discipline. The aim of the thesis is to compare and criticallyevaluate how the prominent Russian historians of this period(namely N. M. Karamzin; N. G. Ustrjalov; M. P. Pogodin; D. I. Ilovaisky; S. M Solovyov; V. O. Klyuchevskii; S. F. Platonov) looked at key aspects of the life and reign of the first pretender. The thesis first brieflytraces the development of Russian historiographyfrom earlychronicling to a modern scientific discipline, thereby establishing the basic methodological and thought context for the subsequent analysis of interpretationsof the figure of False Dmitry I. The main part of the thesis focuses on the comparison of different historiographical approaches to four thematic areas: the origins of False Dmitry, the reasons for his accession to the Russian throne, the causes of his fall, and an assessment of his reign, character and the connection with the clauses of the Time of Troubles. The aim of the work is not only to reconstruct contemporary views of False Dmitry I., but also to reflect criticallyonthem in the light of the..
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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