146 research outputs found
Development of sway reduction control for the Jacket Lift System of Pioneering Spirit
No full textPioneering Spirit, Allseas's largest pipelay vessel, will be outfitted with a novel Jacket Lift System (JLS). A jacket refers to the steel frame which supports the topside of a fixed offshore platform. The Pioneering Spirit was already capable of lifting the topsides of offshore platforms, like the former oil platform Brent Delta, but would have to leave the jacket behind. With the JLS it will also be able to remove and install jackets.In offshore ship mounted crane applications wave disturbances can create unwanted oscillations in suspended loads. Anti-sway control systems have been developed to aid the crane operator in decreasing these oscillations. But not all crane types have actuators suitable for this compensation. The JLS will be a derrick type crane which will be positioned above a jacket using the dynamic positioning of the ship. The hoist systems of the JLS are then lowered and connected to the jacket. During this lowering process the ship motion induced by wave disturbances create a large oscillation in the hoist system.In this thesis a controller is developed based on a proportional derivative controller found in literature to reduce the sway in the hoist system to make the connection process possible.Mechanical Engineering | Systems and Contro
Financial market crashes: Predicting bubbles using the Johansen-Ledoit-Sornette model
No full textIn this project we looked into financial markets. The goal of this project was to find out if a bubble is forming and when the most probable time of bursting would be. that is what we call the critical time. In order to do this we studied the work of Professor Didier Sornette, who is an expert in this field of mathematics. In this bachelor thesis we use the Johansen-Ledoit-Sornette (JLS) model and the Levenberg-Marquardt algorithm to predict the critical time of bubbles. By critical time we mean the most probable time of a bubble to burst, but not for certain: there is always a probability to attain the end of the bubble without bursting. \\We looked at the results Didier Sornette got in his work on Black Monday and tried to obtain the same results. Besides that we investigated the sensitivity of the JLS model and differences between variants of it, also when simulating our own data. In the end we looked at applying the model at real data. For the data we chose the Amsterdam Exchange Index and Bitcoin.Applied Mathematic
Book Review of Towards Creative Learning Spaces
No full textThe review of Towards Creative Learning Spaces: Re-Thinking the Architecture of Post-Compulsory Education is a brief summary of the perceived aims and intentions of the author, Jos Boys. The review highlights the main discussion points of the book and critiques how the author presented the information. In conclusion the reviewer recommends this book to audiences of design students and professionals
The JLS at 50: Art, literature and socio‐legal studies
No full textThis article began life as a lecture the author was invited to deliver as part of the Journal's 50th‐anniversary celebrations in the summer of 2024. The piece explores how law, literature and socio‐legal studies in the United Kingdom have evolved alongside each other since the birth of the Journal of Law and Society in 1974. It examines the Journal's role in this evolution, and how it has provided space for legal scholars, and particularly socio‐legal scholars, to critique, problematise and mull over dilemmas common to law and the arts – sometimes by drawing on methods and insights from the arts themselves. In doing so, the author adopts a Gothic framework for further illuminating the Journal's work in this area, arguing that Gothic fiction helps us to confront ghosts and monsters – especially in those places where the law (or, at least, legal scholars) may fear to tread
Book Review: University Planning and Architecture: The Search for Perfection
No full textThe review of University Planning and Architecture: The Search for Perfection is a brief summary of the the main discussion points in the book, situating the information within a larger context of campus master planning and learning space design. The author also suggests further readings on the topic
Enzymatic activity and proteomic profile of class III peroxidases during sugarcane stem development
No full textCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Class III peroxidases are present as large multigene families in all land plants. This large number of genes together with the diversity of processes catalyzed by peroxidases suggests possible functional specialization of each isoform. However, assigning a precise role for each individual peroxidase gene has continued to be a major bottleneck. Here we investigated the enzyme activity and translational profile of class III peroxidases during stem development of sugarcane as a first step in the estimation of physiological functions of individual isoenzymes. Internodes at three different developmental stages (young, developing and mature) were divided into pith (inner tissue) and rind (outer tissue) fractions. The rind of mature internodes presented the highest enzymatic activity and thus could be considered the ideal tissue for the discovery of peroxidase gene function. In addition, activity staining of 2DE gels revealed different isoperoxidase profiles and protein expression regulation among different tissue fractions. In-gel tryptic digestion of excised spots followed by peptide sequencing by LC-MS/MS positively matched uncharacterized peroxidases in the sugarcane database SUCEST. Multiple spots matching the same peroxidase gene were found, which reflects the generation of more than one isoform from a particular gene by post-translational modifications. The identified sugarcane peroxidases appear to be monocot-specific sequences with no clear ortholog in dicot model plant Arabidopsis thaliana. (C) 2012 Elsevier Masson SAS. All rights reserved.556676Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)FAPESP [2008/58035-6
Wolf Schmid se kommunikasiemodel as basis vir die dualiteitsbegrip: abstrakte auteur as wesens- en digterspersoonlikheid.
No full textIn this article Wolf Schmid\u27s model of communication as propounded in Der Textaufbau in den Erzahlungen Dostoevskijs is used as a basis for a new thesis as regards the concept abstract author. Schmid\u27s model comprises three elements: the author, the work of art as sign and the reader. This article holds that the duality implied in Schmid\u27s term "psychophysischen Dichterpersonlichkeit" should also be made applicable to the concept of the abstract author, regarded by Schmid as the hypostasised image of the author in his text. In this way a very useful distinction can be made between the abstract author as self as he reveals himself in a factual text (autobiography) and the abstract author as "poet" who, operating from the realm of the imagination, produces a fictive text(novel). In its published form, however, the "story text" in the book is preceded by the "writer\u27s text", which is ascribed to the abstract author as self, who "focalizes" or "interprets" what is to follow (e.g. by means of subtitle, motto or titles of chapters). Thus the "writer\u27s text" provides the link between "person" (self) and "poet".
Opsomming In hierdie artikel word Schmid se kommunikasiemodel soos aangebied in Der Textaufbau in den Erzahlungen Dostoevskijs as basis gebruik vir \u27n nuwe tese aangaande die begrip abstrakte outeur. Schmid se model maak voorsiening vir die outeur, die kunswerk as taalteken en die leser. Daar word uitgegaan van die standpunt dat die dualiteit onderliggend aan Schmid se opvatting van die konkrete outeur as \u27n "psycho-physischen Dichterpersonlichkeit" ook van toepassing gemaak behoort te word op die begrip abstrakte outeur, deur horn beskou as die gehipostaseerde spieelbeeld van die konkrete outeur in sy werk. So sal daar dan onderskei kan word tussen die abstrakte outeur as wesenspersoonlikheid soos hy werksaam is in/abstraheerbaar is uit, \u27n feitelike teks soos bv. \u27n outobiografie, en die abstrakte outeur as "digter"-persoonlikheid wat \u27n verbeeldingsteks (roman) daarstel. In sy gepubliseerde vorm bestaan die roman of boek-as-teks uit sowel die verhaalteks (produk van die "digter") as die skrywersteks wat toeligtend - bv. by wyse van motto, sub- of hoofstuktitels - daarby verskyn en wat op rekening van die self (wesenspersoonlikheid) geplaas moet word. Op die wyse word die abstrakte outeur as dubbele entiteit in die skrywersteks verteenwoordig en dien lg. as skakel tussen daargestelde wereld en empiriese wereld
A Learning Studio that Inspires Active Pedagogy
No full textFor this case study, the author describes the successful collaboration between Michigan Technological University and Herman Miller in the creation of a learning studio within an emerging learning commons. This recently opened learning studio provides faculty and students a place to develop their level of understanding in active teaching and learning. The case study outlines the room design process and the support structure for faculty
A concept design for the removal of concrete gravity based structures
No full textDuring the early 1970s the offshore market in the North Sea was growing rapidly. Due to discoveries of natural reserves and development of the oil price, the oil and gas industry developed and deployed many bottom founded offshore structures in the North Sea. Apart from steel jacket structures, many concrete gravity based structures (CGBSs) were constructed. In the coming decades many of the fields with these CGBSs approach the end of their lifetime and must be decommissioned. However, currently no solid solution for the removal of these concrete substructures is available. The introduction of Allseas’ Pioneering Spirit and her capabilities could provide new possibilities for the decommissioning of CGBSs. The Pioneering Spirit is designed for the decommissioning of platforms and its substructure using a unique “single lift” technique. A complete removal of the concrete substructure using this single lift technique is, due to its constructive condition, a perilous operation. However, the decommissioning regulations allow a partial removal of the concrete legs above a water depth of 55 meters. At this water depth a cut is made in the legs and after cutting the Pioneering Spirit can perform a lift of the leg using the Jacket Lift System (JLS). During this removal operation various problems may arise. In this study the main technical difficulties of the partial removal operation are identified. A focus is laid on the difficulties during the lifting phase. The hoisting speed of the JLS is relatively slow compared to the ship motions. This can result in a rebound of the leg during the initial lifting phase. Damage to the leg and a probable damage to the part of the GBS where the oil storage was located may then occur. The objective in this study is to design a solution for the initial lifting phase and analyze the feasibility of this concept. An adequate fast lifting solution after cut-off could overcome the problems associated with the rebound of the concrete legs. The designed solution for fast lifting is based on the concept of a passive heave compensator (PHC). To gain insight into the feasibility of this concept a model has been made in MATLAB/Simulink. Input data for the simulation model are mechanical dimension parameters and physical pressure parameters. By altering the parameters an estimation of the motions of the leg and hence the feasibility of the concept is determined.BFSOffshore & Dredging EngineeringMechanical, Maritime and Materials Engineerin
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