Schools as Communities of Meaning

Vryhof, Steven

doi:10.1177/002205740518500206

Cited by 4 publications

(3 citation statements)

References 2 publications

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“…These relationships are given in anchor performance curves from manufacturers. The curves from the Vryhof Stevpris Mk6 anchor (Vryhof 2018), the latest version of a common anchor for floating wind systems, are used to estimate the required drag-embedment distance.…”

Section: Additional Margin For Anchor Installationmentioning

confidence: 99%

Assessment of Offshore Wind Energy Leasing Areas for Humboldt and Morro Bay Wind Energy Areas, California

Cooperman¹,

Duffy²,

Hall³

et al. 2022

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Section: Additional Margin For Anchor Installationmentioning

confidence: 99%

Assessment of Offshore Wind Energy Leasing Areas for Humboldt and Morro Bay Wind Energy Areas, California

Cooperman¹,

Duffy²,

Hall³

et al. 2022

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“…These include two reports dating from the 1960s , and a paper focusing on Raman spectroscopy with an impure sample . In a doctoral thesis and a further publication about synthesis parameters, Mo 2 GaC was synthesized from the elements as well as from Mo 2 C and gallium, exhibiting only minor impurities.…”

Section: Introductionmentioning

confidence: 99%

Chemical Conversions within the Mo–Ga–C System: Layered Solids with Variable Ga Content

Büchner,

Kubitza,

Malik

et al. 2024

Inorg. Chem.

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Layered carbides are fascinating compounds due to their enormous structural and chemical diversity, as well as their potential to possess useful and tunable functional properties. Their preparation, however, is challenging and forces synthesis scientists to develop creative and innovative strategies to access high-quality materials. One unique compound among carbides is Mo2Ga2C. Its structure is related to the large and steadily growing family of 211 MAX phases that crystallize in a hexagonal structure (space group P63/mmc) with alternating layers of edge-sharing M 6 X octahedra and layers of the A-element. Mo2Ga2C also crystallizes in the same space group, with the difference that the A-element layer is occupied by two A-elements, here Ga, that sit right on top of each other (hence named “221” compound). Here, we propose that the Ga content in this compound is variable between 2:2, 2:1, and 2: ≤1 (and 2:0) Mo/Ga ratios. We demonstrate that one Ga layer can be selectively removed from Mo2Ga2C without jeopardizing the hexagonal P63/mmc structure. This is realized by chemical treatment of the 221 phase Mo2Ga2C with a Lewis acid, leading to the “conventional” 211 MAX phase Mo2GaC. Upon further reaction with CuCl2, more Ga is removed and replaced with Cu (instead of fully exfoliating into the Ga-free Mo2CT x MXene), leading to Mo2Ga1–x Cu x C still crystallizing with space group P63/mmc, however, with a significantly larger c-lattice parameter. Furthermore, 211 Mo2GaC can be reacted with Ga to recover the initial 221 Mo2Ga2C. All three reaction pathways have not been reported previously and are supported by powder X-ray diffraction (PXRD), electron microscopy, X-ray spectroscopy, and density functional theory (DFT) calculations.

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“…Les amarres truncades estan formades per dos tipus de cadena diferents per tal d'emular el disseny d'amarres del prototip a escala real de la plataforma WindCrete en un canal d'assaig estret. (Vryhof, 2015)…”

Section: Pau Trubat Casalunclassified

Station keeping analysis and design for new floating offshore wind turbines

Casal¹

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In the framework of the reduction of the emissions of greenhouse gases, FOWT will be the technology that will exploit the wind resources in deep seas. In order to achieve a commercial deployment of this technology, a cost reduction is necessary through the optimization of the wind turbine by detailed studies to reduce its design uncertainties. One important aspect is the mooring system, which commonly represents between a 10 to 15 % of the capex. The present research aims to increase the knowledge of the design and analysis of the station keeping systems for floating offshore wind turbines. One of the most important aspects for a correct analysis and design of the mooring system is the simulation of the lines coupled with the floating structure and the wind turbine. In this dissertation, two different mooring line models coupled to a finite element model for the analysis of floating platforms are presented. The first model is a finite element model based on a slender rod approach. The model is extended to consider the rheological damping in the axial and bending direction within the constitutive equations of the problem. The second model is a new approach named quasi-dynamic model. The model assesses the static solution of the catenary equation but updates the line tension based on the external hydrodynamic forces and the inertial forces from the theoretical motion of the mooring line. In the design of mooring lines is important to consider and foresee the different phenomena and loads that can act along on the life span of these elements. Within these phenomena, the effects of the waves forces over the mooring lines o have been studied. The study analyzes the contribution of the wave forces over the mooring lines to determine when it is an important source of damage for the fatigue strength. Finally, new floating platform concepts need to be tested and analyzed in controlled conditions in order to validate the models used for the final designs. It is common that pool and flume basins do not present enough size for the catenary shape mooring systems because they cover a large extension. In this area, an optimization model for a truncated mooring system is presented. The truncated mooring system is formed by two types of chains to emulate the actual prototype mooring system of a scale spar platform in a narrow flume. En el marc de la reducció de les emissions de gasos d’efecte hivernacle, l’energia eòlica marina flotant serà la tecnologia que explotarà els recursos eòlics marins a gran profunditat. Per tal d’aconseguir un desenvolupament a escala comercial d’aquesta tecnologia és necessari una reducció dels costos a través de l’optimització dels aerogeneradors a partir d’estudis i anàlisis molt detallats. Un dels aspectes importants és el sistema d’amarratge, el qual pot representar entre un 10 i 15 % del cost total d’una instal·lació. La present recerca aprofundeix en el disseny i anàlisis dels sistemes d’amarratge per a molins de vent flotant. Un dels aspectes més importants per a al correcte disseny i anàlisis dels sistemes d’amarratge és la simulació de les amarres conjuntament amb el sistema flotant. En aquesta dissertació es presenten dos models d’amarres diferents acoblats a un model d’elements finits per a l’anàlisi d’estructures flotants. El primer model, és un model d’elements finits per a línies d’amarres basat en un model de vareta esvelta. El model s’ha ampliat per tenir en compte l’esmorteïment material degut als esforços en les direccions axial i de flexió dins de les equacions constitutives dels problema. El segon model es tracta d’un model quasi-dinàmic, el qual es basa en la solució estàtica de les amarres però actualitza la tensió de l’amarra en funció de les forces inercials i hidrodinàmiques externes calculades a partir del moviment teòric de l’amarra. En el disseny de les amarres també s’ha de tenir en compte i preveure els diferents fenòmens i accions que poden influir en la vida útil d’aquests elements. Dins d’aquests fenòmens, s’ha aprofundit en l’anàlisi dels efectes de les forces de l’onatge sobre les amarres. En aquest sentit es fa una comparació entre la consideració o no d’aquestes forces sobre les amarres pe tal de determinar en quins casos poden suposar una font important de dany per a la seva resistència a la fatiga. Per últim, els nous conceptes de plataformes flotants s’han d’assajar i analitzar en condicions controlades per tal de validar els models utilitzats en el disseny final. És freqüent que les piscines i canals d’assaig no presentin les dimensions adequades per a l’experimentació dels sistemes d’amarres ja que poden ocupar una gran extensió d’espai. En aquest àmbit es presenta un model d’optimització d’unes amarres truncades formades per dos tipus de cadena diferents per tal d’emular el disseny d’amarres del prototip a escala real.

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Schools as Communities of Meaning

Cited by 4 publications

References 2 publications

Assessment of Offshore Wind Energy Leasing Areas for Humboldt and Morro Bay Wind Energy Areas, California

Assessment of Offshore Wind Energy Leasing Areas for Humboldt and Morro Bay Wind Energy Areas, California

Chemical Conversions within the Mo–Ga–C System: Layered Solids with Variable Ga Content

Station keeping analysis and design for new floating offshore wind turbines

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