1,721,462 research outputs found
Are self-organizing biochemical networks emergent?
Full text linkBiochemical networks are often called upon to illustrate emergent properties of living systems. In this contribution, I question such emergentist claims by means of theoretical work on genetic regulatory models and random Boolean networks. If the existence of a critical connectivity Kc of such networks has often been coined “emergent” or “irreducible”, I propose on the contrary that the existence of a critical connectivity Kc is indeed mathematically explainable in network theory. This conclusion also applies to many other types of formal networks and weakens the emergentist claim attached to bio-molecular networks, and by extension to living systems
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
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
Design, construction and calibration of a laboratory pressuremeter (PMTlab)
No full textLa caracterización de los parámetros geotécnicos de un suelo, se pueden diagnosticar mediante ensayos de laboratorio o de campo (in-situ), obteniendo así unas características específicas para determinar el comportamiento del mismo, y de esa manera identificar qué tipo de obras son adecuadas. Uno de los ensayos de campo más destacados es el ensayo de Presurimetro (PMT) (Menard,1957) el cual es adecuado para obtener curvas esfuerzo horizontal vs deformación y es aplicable a problemas geotécnicos que impliquen la estimación de parámetros como el Ko (presión en reposo), el esfuerzo horizontal, entre otros.The characterization of the geotechnical parameters of a soil can be diagnosed through laboratory or field tests (in-situ), thus obtaining specific characteristics to determine its behavior and thus identify what type of foundation work is suitable. One of the most outstanding field tests is the Pressurimeter Test (PMT)(Menard,1957), which has some important advantages over the other tests, since this can demonstrate the pressure-deformation behavior of a volume of soil representative.TABLA DE CONTENIDO
RESUMEN XI
ABSTRACT XII
CAPÍTULO 1 INTRODUCCIÓN 1
1.1 Planteamiento del problema 3
1.2 Justificación 5
1.3 Objetivos 7
1.3.1 Objetivo General. 7
1.3.2 Objetivos Específicos. 7
1.4 Presentación del documento 8
2 CAPÍTULO 2 ANTECEDENTES Y ESTADO DEL ARTE 9
2.1 Antecedentes 9
2.1.1 Dilatómetro de Marchetti 11
2.1.2 Ensayo Pentración de Cono CPT 13
2.1.3 Ensayo Penetración Estandar SPT 14
2.1.4 Ensayo de Veleta VST 16
2.2 Estado del Arte 16
2.2.1 Comparación del presiómetro vs ensayos de laboratorio 17
2.2.2 Interpretación de resultados de Presiómetro para diseño de infraestructuras 21
2.2.3 Nuevos modelos propuestos 23
3 CAPÍTULO 3 MARCO TEÓRICO 25
3.1 Presurimetro de Menard (PMT) 25
3.2 Calibración 28
3.3 Interpretación 30
4 CAPÍTULO 4 (METODOLOGÍA/DESARROLLO/MATERIALES Y MÉTODOS/DISEÑO EXPERIMENTAL) 34
4.1 Desarrollo de objetivos 34
5 CAPÍTULO 5 RESULTADOS 49
5.1 Descripción de la muestra ensayada 49
5.1.1 Límites de consistencia 49
5.1.2 Gravedad específica 55
5.1.3 Ensayo compresión Inconfinada 57
5.1.4 Ensayo corte directo 62
5.1.5 Resultados del ensayo presiométrico 71
6 CAPÍTULO 6 CONCLUSIONES Y RECOMENDACIONES 81
6.1 Conclusiones del estudio 81
6.2 Recomendaciones 84
REFERENCIAS 86Maestrí
Comparison of the deflections of soils reinforced with geocells in different configurations and without reinforcing in a real scale test
No full textEl presente trabajo de investigación muestra el aporte que genera el sistema de innovación de refuerzo en estructuras usando Geosintéticos 3D denominado Geocelda, capaz de optimizar las estructuras viales mediante el confinamiento de las partículas de suelo siendo comparado mediante deflexiones tomadas a escala real en diferentes configuraciones, ya que para diseñar una estructura de pavimento reforzada con Geoceldas es de gran importancia evaluar las deflexiones y el factor de aumento de módulos de elasticidad, para así tener certeza de dicho aporte. Se indago acerca de las funciones que tienen las Geoceldas en una estructura de pavimento, ensayos y normas necesarias para la construcción de una carretera para simular de la manera más acertada las condiciones reales en el tramo de prueba. Adicionalmente, el procedimiento y circunstancias óptimas para realizar mediciones de deflexión con la viga benkelman, así como también ensayos de cono de arena para determinar la densidad de la capa y Speedy para garantizar la humedad óptima del material empleado, entre otros. Se llevó a cabo el control respectivo a la ejecución de obra del tramo de prueba para garantizar que se realiza con las condiciones ideales de humedad, compactación, suelo o material, y procesos constructivos propuestos.This research work shows the contribution generated by the innovation system of reinforcement in structures using 3D Geosynthetics called Geocell, capable of optimizing road structures by confining the soil particles being compared by deflections taken at real scale in different configurations, since to design a pavement structure reinforced with Geocells is of great importance to evaluate the deflections and the factor of increase of elasticity modules, in order to be certain of such contribution. It will be indago about the functions that have the Geoceldas in a pavement structure, essays and rules necessary for the construction of a road to simulate the most successful way the actual conditions in the test section. Additionally, the procedure and optimal circumstances to perform deflection measurements with the Benkelman beam, as well as sand cone tests to determine the density of the layer and Speedy to guarantee the optimal humidity of the material used, among others. The respective control of the execution of the test section was carried out to ensure that it is carried out with the ideal conditions of humidity, compaction, soil or material, and proposed construction processes.CONTENIDO
Resumen
Introducción
1. Problema
1.1 Identificación
1.2 Descripción
1.3 Planteamiento
2. Delimitación
2.1 Conceptual
2.2 Cronológica
3. Justificación
4. Objetivos
4.1 Objetivo General
4.2 Objetivos Específicos
5. Marco Referencial
5.1 Antecedentes
5.2 Marco Conceptual
5.2.1 Geosintéticos
5.2.2 Ensayos de laboratorio
5.2.3 Ensayos en campo
5.3 Marco Teórico
6. Metodología
6.1 Fase de ensayos de laboratorio
6.2 Fase de campo
6.3 Fase de procesamiento de datos
7. Resultados
7.1 Ensayos de laboratorio
7.2 Ensayos de campo
7.3 Deflexiones
8.Conclusiones
9.Recomendaciones
Bibliografía
ANEXOSPregradoEste trabalho de pesquisa mostra a contribuição gerada pelo sistema inovador de inovação de reforço em estruturas utilizando Geossintéticos 3D denominado Geocelula, capaz de otimizar estruturas rodoviárias por meio do confinamento de partículas de solo, sendo comparado por meio de deflexões tomadas em escala real em diferentes configurações, uma vez que para projetar uma estrutura de pavimento reforçada com Geocells é de grande importância avaliar as deflexões e o fator de aumento dos módulos de elasticidade, a fim de ter certeza dessa contribuição. As funções das geocélulas em uma estrutura de pavimento, os testes e os padrões necessários para a construção de uma estrada foram investigados a fim de simular as condições reais na seção de teste da maneira mais precisa possível. Além disso, o procedimento e as circunstâncias ideais para as medições de deflexão com a viga Benkelman, bem como os testes de cone de areia para determinar a densidade da camada e o Speedy para garantir o teor de umidade ideal do material usado, entre outros. Foi realizado o respectivo controle da execução da seção de teste para garantir que ela seja realizada com as condições ideais de umidade, compactação, solo ou material e processos de construção propostos
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