1,721,026 research outputs found
A wave energy converter for ODAS buoys (WECO)
Get PDFOcean Data Acquisition System (ODAS) buoys are deployed in many seas around the world, a subset of these are wave monitoring buoys. Most are powered by solar panels. Many of these buoys are subjected to movement from waves, and could benefit from a wave energy converter specifically designed for ODAS buoys (WECO). A particular buoy that could benefit from this technology is the TriAXYS wave buoy [1]. This thesis discusses the development of a self-contained WECO that would replace one of the buoys four on board batteries, and harvest energy from the buoy motion to charge the remaining three batteries. A major constraint on the WECO is that it can’t affect buoy motion and jeopardize wave data that is derived from the motion.
Rather than follow a traditional approach to simulating the motion of the buoy / WECO system, using hydrodynamic modelling and theoretical wave profiles, existing motion data from a buoy installation was analyzed to find the loads that were applied to the buoy to cause the motion. The complete set of mass properties of the TriAXYS buoy were derived from the 3D model provided by AXYS Technologies. These mass properties were compared to the linear and rotational accelerations to find the loads that were applied at the buoy center of gravity (CG) to cause the recorded motion.
An installation off the coast of Ucluelet, BC was selected for this investigation because it is subjected to open ocean swells, and data from the winter months of November to March of 2014 to 2016 is available. Winter data was used since there is more wave action to power the WECO during the winter months, and there is sufficient solar irradiation to power the buoy in summer months. Accurate buoy motion data at a 4 Hz sampling rate was available from three rotational rate gyros and three linear accelerometers installed in the buoy. Each dataset of samples represented a 20 minute window that was recorded once every hour.
Five conceptual WECO designs were developed, each of which focused on the extraction of power from a different degree of freedom (DOF) of buoy motion (surge, sway, heave, roll, and
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pitch). Three designs used a sliding (linear) oscillating mass, and one was aligned with each of the surge, sway, and heave axis of the buoy. Two designs used a rotating oscillating mass, and the axis of rotation of each device was aligned with either the roll or pitch axis of the buoy.
All proposed WECO configurations were modeled as articulated mass, spring, and damper systems in MATLAB using the Lagrange method. Each WECO/buoy assembly formed an articulated body. Mass properties for each configuration were derived from the 3D models. The equations of motion for the original buoy no longer applied, but the environmental forces applied to the hull would still be valid as long as the WECO didn’t alter motion significantly.
The power take off (PTO) was modeled following standard convention as a viscous dashpot. The damping effect of the dashpot was included in the models using Rayleigh’s dissipation function that estimated the energy dissipated by the PTO.
A subset of load datasets was selected for evaluating the maximum power potential of each WECO. Each WECO was tuned to each dataset of loads using the spring rate, and the damping coefficient was optimized to find the maximum power while avoiding end stop collisions. A second subset of data was selected to evaluate the average power that would be generated throughout the winter months for the two most promising designs. This evaluation was performed for static spring and damping coefficients, and the coefficients that resulted in the highest power output were discovered.
The motion of the WECO oscillating mass with respect to the buoy was used in conjunction with the damping ratio to form an estimate of the ideal (i.e. with no mechanical or electrical losses) power generation potential of each WECO configuration during the winter months. The two leading WECO designs both had sliding (linear) oscillating masses, one was aligned with the surge axis and produced theoretical average of just over 0.5 W, the other was aligned with the heave axis and produced theoretical average of just under 0.5 W.Graduat
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
WECO - wireless ecoponto
Get PDFDissertação de mestrado integrado em Engenharia de ComunicaçõesActualmente, a sensibilização por parte das pessoas para com os problemas ambientais
tem vindo a aumentar. A recolha de resíduos urbanos constitui uma dessas
preocupações, fazendo já parte do nosso quotidiano a separação dos resíduos sólidos
produzidos diariamente que são posteriormente depositados em contentores próprios
com destino à reciclagem, os ecopontos. Contudo, o enchimento dos ecopontos, ocorrendo
aleatoriamente, torna difícil a tarefa de recolha, visto ser difícil a previsão de
quando é que este se encontra cheio. Esta dificuldade tem como consequência o deslocamento
de veículos de recolha a uma ilha de ecopontos que se encontra cheia e
que justificava intervenção há algum tempo (a zona circundante pode ter lixo abandonado
que já não cabe no contentor), ou a uma ilha de ecopontos que se encontra
com baixos níveis de enchimento, traduzindo-se num desperdício de recursos e tempo
visto que não se justificaria a sua recolha.
Com o objectivo de aumentar a eficiência da recolha de resíduos e reduzir os
custos associados, foi implementada uma plataforma de monitorização do nível de
enchimento de ecopontos, o Wise Waste, desenvolvida pela SOMA do grupo Auto-
Sueco , encontrando-se actualmente em funcionamento em vários municípios do país.
Contudo esta plataforma apresenta algumas limitações, nomeadamente a necessidade
de cabos de ligação para alimentação e/ou comunicação entre os vários elementos do
sistema, o elevado consumo energético e o facto de não poder ser usada em todos os
tipos de contentores existentes.
Nesta dissertação é apresentada a plataformaWeco, uma plataforma inteligente de
monitorização do nível de enchimento de ecopontos que pretende actualizar, apresentando
vários melhoramentos, a plataforma actual Wise Waste. A plataforma Weco,
devido à sua natureza sem fios pode ser usada em todos os tipos de contentores
existentes e introduz uma gestão de energia mais eficiente, entre outras vantagens,
contribuindo para uma recolha mais eficiente e programada e amiga do ambiente.Nowadays, people have became more aware about the environmental issues, one
of these is the waste separation and recycling. Waste is separated at home and later
deposited in outdoor recycling bins located at a recycling spot. Consenquently, the
number of recycling spots has been steadily increasing.
However, and because the recycling bins are randomly filled, it’s a hard task
to predict when they are full and the collecting company has dificulties in defining
collecting routes for the vehicles. This often results in collecting an empty recycling
bin, one with a very-low fill level, or even one that was full a long time ago (generally
meaning that the area surrounding the bin is full of damped waste).
Aiming to increase the quality of waste collecting and the efficiency, in order
to reduce costs, a monitoring platform of the filling level of the recycling bins was
implemented, the Wise Waste from SOMA, and it’s currently being used in several
points of the country. However this monitoring platform has several limitations, such
as the need for cables for communications and/or power supply, the overall system
energy consumption and that it can’t be used in all types of recycling bins.
This master’s thesis presents Weco, an embedded platform for monitoring the
recycling bins filling level, and aims to improve the current system, Wise Waste,
offering a very low cost implementation, wireless communications and a low power
architecture that can be used in any kind of existing recycling bins, contributing for
an efficient and scheduled waste collection and more environmentally friendly
Investigación, análisis y creación del manual de identidad corporativa y diseño web para la empresa WeCo
No full text[ES] Este proyecto consistirá en la investigación bibliográfica y el análisis exhaustivo de la competencia para la posterior creación de un manual de identidad corporativa y el diseño visual de la web para el proyecto empresarial WeCo.Polo Gallardo, Á. (2015). Investigación, análisis y creación del manual de identidad corporativa y diseño web para la empresa WeCo. Universitat Politècnica de València. https://riunet.upv.es/handle/10251/128246Archivo delegad
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
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
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