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1
Fan, Huangjia (Francis Huangjia). "Statistical control and experimental design for edge bead reduction in laminating process." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/62540.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2010.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 77-78).
Edge bead formation is a well-known phenomenon typically happening in the lamination due to the physics of this process. It causes the defect of high edge observed in the carton roll after the laminated carton sheets are wrapped around the roller in Company X; the affected carton sheets can no longer be fed into customers' filling machines due to the uneven surface. To address this problem, a model with process parameters and quality characteristics was built to define the lamination. Based on this model, the capability of measurement system was verified and current process capability was calculated. After that, Shewhart control charts were employed to identify the assignable causes and to bring the process to in-control state. Then, a designed experiment was conducted to find the optimal operating conditions. It was found that line speed, screw speed, die-bolt power and die-lip build-up are most likely to be subject to disturbances. In addition, diebolt power, manifold plug and deckle blade have a statistically significant impact on the edge bead formation. As a result, an out-of-control-action plan was proposed and a recipe is recommended for edge bead reduction in laminating process.
by Huangjia Fan.
M.Eng.
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Buck, Dietrich. "Massivträ : Jämförelse mellan olika principer för sammanfogning av trä till plattelement med avseende på pris, hållfasthet och ekologi." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-33487.
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Ökad användning av byggtekniken massivträ kan ge ett positivt bidrag till hållbart byggande. Utvecklingen inom datornavigerad bearbetning ger massivträ möjligheten att rationalisera byggproduktionen inom trä. Tekniken ligger rätt i tiden och kommer att värderas allt högre då den tillvaratar materialets karaktäristiska egenskaper. Utvecklingen av massivträ har resulterat i teknikvarianter av hur virke kan sammanfogas till solida element. Ett behov har funnits av en marknadsjämförelse mellan befintliga principer där studien förtydligar grundläggande skillnader för intresserade byggaktörer. Problemfrågan för denna studie har varit: vilka principer för sammanfogning av trä till plattelement inom massivträ är mest fördelaktiga? Detta sett utifrån faktorerna produktionskostnad, hållfasthet och ekologiska övervägningar. För att förtydliga den undersökta byggmetodens nytta i ett vidare perspektiv har det presenterats en allmän beskrivning av massivträ. Studien är jämförande och grundar sig på en litteraturstudie samt företagskontakter med 27 företag i 6 länder. Följande tekniker för tillverkning av plattelement i massivträ har behandlats i rapporten: Limning Spikning Klamring Skruvning Tvärspänning Dymling: vertikal-, horisontal- och diagonalgående samt med skruvar i trä Laskning Träsvetsning Studien visar att teknikerna inom massivträ skiljer sig åt. Högst bedömning får korslimmat trä (CLT) när det gäller kostnad och hållfasthet. Med hänsyn till ekologin värderas laskat trä högst. Vid en sammanvägning av hållfasthet och ekologi är den skruvformade trädymlingen fördelaktigast. Dessa alternativ ger valfrihet i synlig yta samt ett effektivt resursutnyttjande av lågvärdigare virkeskvalitéer och lämpar sig inom bostadsbyggnation. CLT är mest kostnadseffektivt, inte patentskyddat samt det mest etablerade alternativet på marknaden dock är utvecklingen av ett sunt lim fortfarande under arbete. I pågående forskning finns ett annat alternativ där tekniken träsvetsning visat ge en starkare fog än lim. Ur ekologisk synpunkt är plattelement genomgående i trä är att föredra, då det ger en sund konstruktion i full skala, eftersom inga kemikalier eller lagerresurser används. Forskning har visat att massivträ har en positiv och hälsofrämjande effekt på de boende i motsats till effekterna av icke naturliga material.The increasing use of solid wood construction methods can have a positive impact on the sustainability of constructions. The development of computer-controlled processing techniques enables the solid wood timber industry to rationalize the construction of buildings. The solid wood techniques come at time and will be higher valued in the future due to the natural characteristics of this material. The improvement of solid wood methods has resulted in various techniques to join wood into solid prefabricated parts. There is a need for a comparative market study of the different principles of solid wood construction to widen the knowledge and to explain interested builders the viability of these techniques. The key question for this study is: Which techniques of combining solid wood elements to whole boards are the most favorable ones concerning wood construction buildings – leaving apart questions of production costs, durability and ecological considerations? To point out the utility of these construction techniques and give them a broader understanding a general study of solid wood construction has been presented. The comparative study is based as well on studies of literature as on reviews of 27 companies in 6 countries. The following techniques for the production of boards made of solid timber elements are considered in this report: Laminating Nailing Stapling Screwing Stress laminating Doweling: vertically, horizontally, diagonally and with wooden screws Dovetailing techniques Wood welding techniques The study shows that the techniques of solid wood construction are very different in itself. CLT of cross-laminated timber scores highest in terms of cost and durability, but if one considers ecological factors, dovetailing is best. Taking into account both durability and ecological considerations, doweling is best. These alternatives give some freedom of choice regarding the visibility of surfaces and the efficient use of lower qualities of timber and they are therefore suitable for residential construction buildings. CLT is the most cost-effective, not patented and well established option in the market; the development of more health-friendly adhesives is still going on. Current researches demonstrate an alternative: Wood welding joins the parts better together than gluing them. Considered from the ecological viewpoint, boards made exclusively of wood, are preferable since no chemicals or not renewable resources are used. Recent researches show, that solid wood constructions have positive effects on the health of the residents of these buildings in comparison of buildings using non-natural materials.
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Umbrasas, Edmundas. "Atsitiktinių ir sisteminių faktorių laminavimo kokybei įtakos tyrimas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2008. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2008~D_20080722_153921-92904.
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Darbe ištirtas elektrofotografinių atspaudų laminavimo stipris bei pailgėjimas atplėšiant laminatą. Tyrimui naudota dešimt skirtingų popieriaus rūšių, šešios laminavimo plėvelių rūšys. Laminavimo stipris testuotas esant dažų dengimo plotui nuo 0 iki 400 % (25 variantai). Nustatyta, kad elektrofotografinių atspaudų laminavimo stipris yra mažesnis už švaraus popieriaus ir tolygiai mažėja didėjant dažų plotui. Laminavimo stipris taip pat priklauso nuo popieriaus ir plėvelės rūšies. Laminavimo blizgiosiomis plėvelėmis laminavimo stipris yra didesnis lyginant su matinėmis plėvelėmis. Šie dėsningumai aiškinami dažų kogezijos ir dažų ir plėvelių adhezijos ypatumais. Nustatytos optimalios laminavimo stiprio atžvilgiu popieriaus ir plėvelių kombinacijos. Darbą sudaro 8 dalys: įvadas, literatūros apžvalga, tyrimų metodika, rezultatai ir jų aptarimas, išvados ir rekomendacijos, santrumpos, literatūros sąrašas, priedai. Darbo apimtis – 59 p. teksto be priedų, 21 lentelė, 35 paveikslai, 17 bibliografinių šaltinių. Darbo priedai pridedami darbo pabaigoje.The strength and elongation before total delaminating of elctrophotographic prints were investigated. 10 different paper grades and 6 different lamination films were tested. Lamination strength was tested at ink coatings from 0 to 400 % (25 different versions). It was established that lamination strength of electro photographic prints is lower as compared with nonprinted paper. The lamination strength gradually decreases with toner coating and depends on paper and laminating film properties. Glossy films exhibit higher lamination strength as compared with mat tone. These phenomena are explained by toner and films adhesion and cohesion peculiarities. The optimal combinations of paper and lamination film. Thesis consist of: 59 p. text without appendixes, 21 tables, 35 pictures, 17 bibliographical entries. Appendixes are added after the main part of master thesis.
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Brameshuber, Wolfgang, and Rebecca Mott. "Zwei Anwendungsbeispiele für Textilbeton." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1244049312729-95638.
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In dieser Veröffentlichung werden 2 Anwendungsbeispiele für Textilbeton vorgestellt, ein nachträgliches Abdichtungssystem sowie eine bauteilintegrierte Schalung. Teil 1: Da in vielen Regionen Deutschlands steigende Grundwasserspiegel zu verzeichnen sind und bestehende Gebäude, die nicht für den Belastungsfall „drückendes Wasser“ ausgelegt sind, mit einem tragfähigen nachträglichen Abdichtungssystem ertüchtigt werden müssen, wurde ein entsprechendes Abdichtungssystem aus Textilbeton entwickelt. Durch die Verwendung des Textilbetons ist es möglich, ein Abdichtungssystem mit einer geringen Bauteilstärke von 30 mm im Spritzverfahren herzustellen. Teil 2: Die bauteilintegrierte Schalung (BIS) aus Textilbeton nimmt während der Betonage den Frischbetondruck auf. Im Endzustand bildet sie die Bauteiloberfläche und kann Anforderungen hinsichtlich Tragfähigkeit, Sichtbeton- und Oberflächenqualität sowie Oberflächenausbildung (Farbe, Struktur) erfüllen. BISElemente können werksmäßig wirtschaftlich und qualitativ hochwertig hergestellt werden.
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Gupta, Vineet Makarov Nicolai G. "Conformal laminations /." Diss., Pasadena, Calif. : California Institute of Technology, 2004. http://resolver.caltech.edu/CaltechETD:etd-05132004-233348.
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Bermudez, Carro Miguel. "Laminations boréliennes." Lyon 1, 2004. http://www.theses.fr/2004LYO10041.
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Dans la première partie de la thèse nous développons une théorie de l'obstruction dans le cadre des feuilletages dans le but de fournir une approche géométrique du théorème de Gauss-Bonnet feuilleté démontré par Alain Connes. Nos techniques permettent d'affaiblir considérablement les hypothèses du théorème de Connes. Dans la deuxième partie de la thèse nous démontrons que toute lamination hyperfinie par plans, tores et cylindres est le revêtement d'un tore. Nous prouvons aussi que toute lamination parabolique est moyennable. En particulier, ce résultat permet de donner une caractérisation complète des laminations admettant une métrique plate complète
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Blanc, Emmanuel. "Propriétés génériques des laminations." Lyon 1, 2001. http://www.theses.fr/2001LYO10238.
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Une lamination est un feuilletage généralisé : un espace compact, qui en général n'est pas une variété, est partitionné en variétés de dimension fixée : les feuilles. La théorie générique étudie "presque toutes" les feuilles. Les deux résultats modèles montrent que presque toutes les feuilles d'une lamination ont 0, 1, 2 ou un Cantor de bouts, au sens d'une mesure harmonique (Ghys) et au sens de Baire si la lamination est minimale (Cantwell-Conlon). Après avoir retrouvé le résultat de Cantwell-Conlon, nous étudions les laminations minimales dont presque-toutes les feuilles au sens de Baire ont 2 bouts. Nous montrons que toutes leurs feuilles ont 1 ou 2 bouts et décrivons leurs types de quasi-isométrie. Dans ce cas, presque-toutes les feuilles au sens de toute mesure harmonique ont 2 bouts. Nous donnons la liste finie des surfaces pouvant apparaître dans ces laminations. Enfin, le cas transversalement-Cantor est classifié en terme d'actions de groupes à 2 bouts. Par contraste, nous construisons ensuite deux laminations minimales dont presque toutes les feuilles au sens de Baire ont 1 bout : une première telle que toute surface orientale non compacte est homéomorphe à une feuille, une seconde dont presque toutes les feuilles au sens d'une mesure harmonique (en fait invariante) ont 2 bouts. Enfin, nous généralisons nos résultats et ceux de Ghys et Cantwell-Conlon aux laminations récurrentes et à celles munies de mesures conservatives. Presque-toutes leurs feuilles, au sens de Baire dans le premier cas, relativement à la mesure dans le second, ont 1, 2 ou une infinité de bouts.
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Österberg, Frida. "The visual impact of lamination." Thesis, Linköpings universitet, Institutionen för teknik och naturvetenskap, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-97777.
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This scientific study concerns the visual colour effect caused by the thin polyethylene coating extruded on printed packaging material. The origin of the phenomenon is discovered and characterised mathematically. CIE delta E 2000 theory is adapted in the research for mathematical judgement of visual difference. The report handles the procedure of defining the character of the visual distortion and a characterisation of the effect. In this process it discusses areas as dot gain, colour shift and production parameters. It as well covers the background of colour and printing science. The aim of the work is to create a model that predicts the visual effect of lamination in the proofing stage of the production.
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Kalldin, Sofie. "Lamination of Organic Solar Modules." Thesis, Linköpings universitet, Biomolekylär och Organisk Elektronik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-105629.
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As the Worlds energy demand is increasing we need more of our energy to be generated from resources that affect the climate as little as possible. Solar power could be the solution if there were solar panels with a less energy demanding production than the established silicon based solar modules. Printable organic solar cells will enable a cheap production process, thus they are mainly made out of polymers in solution. However, to be able to decrease the total cost of the solar modules the commonly used indium tin oxide (ITO) for the transparent electrode needs to be replaced by a less expensive material. If the cheap, high conductive and transparent polymer poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) could replace ITO the cost of organic solar modules would significantly decrease. For PEDOT:PSS to be able to replace ITO there are requirements that have to be met. The transparent electrode needs to be apart from transparent, highly conductive, have a low contact resistance to the other materials in the organic solar cell and be printable. In this study it has been shown that the PEDOT:PSS film with Zonyl and Diethylene Glycol (DEG) as an secondary dopant, is capable of laminating to thin films made out of PEDOT:PSS, metal or a polymer fullerene blend. The contact resistances between two PEDOT:PSS films and PEDOT:PSS film and a metal film proved to be low. When laminating to a metal film an interlayer of Silver Nano Wires (AgNW) was needed to achieve a low contact resistance.
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Taylor, Christopher Scott. "Defining Sustainability Through Bentwood Lamination." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/51265.
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What does sustainability mean with respect to furniture design and fabrication? How has technology - created and subsequently clouded - opportunities for new thinking? This body of work explores these broader questions and, more specifically, the efficiencies of bending wood. Historical precedents will guide a distillation of established bentwood technologies, which in turn will generate a more sustainable operation. The framework of this operation revolves around a minimalist approach to design coupled with an increased focus on product longevity - the paramount sustainable attribute. Additionally, an investigation of suitable alternatives to the most common - and highly toxic - adhesives is necessary. Beyond secondary research the primary research will utilize small-scale models to minimize material waste while examining the appropriateness of new processes. These studies will emulate the sculptural plywood experiments of Alvar Aalto and Charles and Ray Eames. The final manufacturing process will make use of these study models with the intent of generating a modular system of interchangeable formwork to customize sustainably produced pieces. Final deliverables include the tangible studies along with full-scale designs utilizing modular formwork and a research component documenting the potential for a more comprehensive definition of sustainability with regards to furniture.Master of Science
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Goodman, Oliver A. "Metrized laminations and quasisymmetric maps." Thesis, University of Warwick, 1989. http://wrap.warwick.ac.uk/100508/.
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Teichmuller space is defined as a space of hyperbolic structures on a surface rather than as a space of conformal structures. Earthquakes are defined and we see how they correspond to hyperbolic structures, via homeomorphisms of the circle. Metrised laminations are defined and we obtain a correspondence with earthquakes. We deduce a correspondence between measured laminations and earthquakes. We define uniform boundedness of earthquakes and show that such earthquakes are surjective. Quasisymmetric maps are defined and investigated. We show that an earthquake is uniformly bounded if and only if its boundary mapping is quasisymmetric. Finally we show how a uniformly bounded earthquake can be approximated, in a natural fashion, by a bi-Lipechits diffeomorphism.
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Kim, Jina 1984. "Lamination of a biodegradable polymeric microchip." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/35137.
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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2006.Includes bibliographical references (leaf 22).
This work builds on the initial design of a polymer microchip for controlled-release drug delivery. Currently, the microchip employs a nonbiodegradable sealant layer, and the new design aims to fabricate it only of biodegradable parts. Experiments were conducted to evaluate two potential designs that are fabricated via lamination, and a final design was proposed based on the results. Design 1 sought to replace the sealant directly with a PLA backing layer, but the laminated backing layer was found to leak in 14C-dextran release experiments. Design 2 used a laminated film instead of the original injected membrane. The laminated film was optimized to a 200- [mu]m thick poly(D,L-lactic-co-glycolic acid) 2A membrane, and the film-laminated microchip was shown to release 14C-dextran within a 40-day period. The final proposed design was based on Design 2, which demonstrated more potential as a future means of drug delivery.
by Jina Kim.
S.B.
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Petite, Samuel. "Laminations et pavages du demi-plan hyperbolique." Phd thesis, Université de Bourgogne, 2005. http://tel.archives-ouvertes.fr/tel-00011423.
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Cette th{è}se traite des propri{é}t{é}s des syst{è}mes dynamiques associ{é}s aux pavages du planeuclidien $\R^2$ et du demi-plan hyperbolique \H. Un pavage de $\R^2$ ou de \H, code une action
d'un groupe d'isom{é}tries (soit le groupe des translations du plan, soit le groupe des
transformations affines) sur un espace m{é}trique compact $\Omega$ de sorte que les propri{é}t{é}s de
cette action sont reli{é}es avec les propri{é}t{é}s combinatoires du pavage. Les actions obtenues par
cette mani{è}re ont des comportements tr{è}s vari{é}s. Pour certains cas, comme par exemple pour le
pavage de Penrose, cette action est libre et minimale. Ceci donne {à} l'espace $\Omega$ une structure
de lamination particuli{è}re appell{é}e {\it sol{é}no{\"\i}de}. Localement, cet espace est le produit d'un
ensemble de Cantor par un ouvert du plan euclidien (resp. hyperbolique). Dans cette th{è}se, nous
{é}tudions principalement le comportement statistique des orbites de telles actions. Pour cela nous
caract{é}risons les mesures finies invariantes pour ces actions ainsi que les mesures harmoniques des
sol{é}no{\"\i}des associ{é}s. Il apparait des diff{é}rences fondamentales dans les techniques utilis{é}es entre
le cas euclidien et le cas hyperbolique. Nous donnons de plus, pour tout entier $r\geq 1$ des
exemples explicites de pavages du demi-plan hyperbolique dont le syst{è}me dynamique associ{é} est une
action libre et minimale poss{é}dant $r$ mesures finies invariantes et ergodiques.
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Thevenin, Paul. "Arbres, laminations du disque et factorisations aléatoires." Thesis, Institut polytechnique de Paris, 2020. http://www.theses.fr/2020IPPAX021.
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Cette thèse est consacrée à l'étude des propriétés asymptotiques de grands objets combinatoires aléatoires. Trois familles d'objets sont au centre des travaux présentés ici : les arbres, les factorisations de permutations et les configurations de cordes non croisées du disque (aussi appelées laminations).Dans un premier temps, nous nous intéressons spécifiquement au nombre de sommets de degré fixé dans des arbres de Galton-Watson que l'on a conditionnés de différentes façons, comme par exemple par leur nombre de sommets de degré pair ou leur nombre de feuilles. Lorsque la loi de reproduction de l'arbre est critique et dans le domaine d'attraction d'une loi stable, nous montrons notamment la normalité asymptotique de ces quantités. Nous nous intéressons également à la répartition de ces sommets de degré fixé dans l'arbre, lorsqu'on explore celui-ci de gauche à droite.Dans un second temps, nous considérons des configurations de cordes du disque unité qui ne se coupent pas, et montrons que l'on peut coder un arbre de manière naturelle par une telle configuration. Nous définissons en particulier une suite croissante de laminations codant une fragmentation d'un arbre donné, c'est-à-dire une manière de découper cet arbre en des points choisis aléatoirement. Ce point de vue géométrique nous permet ensuite d'étudier les propriétés d'une factorisation du cycle (1, 2,⋯, n) en un produit de n-1 transpositions, choisie uniformément au hasard, en la codant dans le disque par une lamination aléatoire et en remarquant un lien entre ce modèle et un arbre de Galton-Watson conditionné par son nombre total de sommets. Enfin, dans une dernière partie, nous présentons une généralisation de ces résultats à des factorisations aléatoires de ce même cycle, qui ne sont plus nécessairement en produits de transpositions mais peuvent faire intervenir des cycles de longueurs plus grandes. Nous mettons de cette façon en lumière un lien entre des arbres de Galton-Watson conditionnés, les factorisations de grandes permutations et la théorie des fragmentationsThis work is devoted to the study of asymptotic properties of large random combinatorial structures. Three particular structures are the main objects of our interest: trees, factorizations of permutations and configurations of noncrossing chords in the unit disk (or laminations).First, we are specifically interested in the number of vertices with fixed degree in Galton-Watson trees that are conditioned in different ways, for example by their number of vertices with even degree, or by their number of leaves. When the offspring distribution of the tree is critical and in the domain of attraction of a stable law, we notably prove the asymptotic normality of these quantities. We are also interested in the spread of these vertices with fixed degree in the tree, when one explores it from left to right.Then, we consider configurations of chords that do not cross in the unit disk. Such configurations notably code trees in a natural way. We define in particular a nondecreasing sequence of laminations coding a fragmentation of a given tree, that is, a way of cutting this tree at points chosen randomly. This geometric point of view then allows us to study some properties of a factorization of the cycle (1, 2,⋯, n) as a product of n-1 transpositions, chosen uniformly at random, by coding it in the disk by a random lamination and by remarking a connection between this model and a Galton-Watson tree conditioned by its total number of vertices. Finally, we present a generalization of these results to random factorizations of the same cycle, that are not necessarily as a product of transpositions anymore, but may involve cycles of larger lengths. We highlight this way a connection between conditioned Galton-Watson trees, factorizations of large permutations and the theory of fragmentations
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Berger, Pierre. "Persistance des stratifications de laminations normalement dilatées." Paris 11, 2007. http://www.theses.fr/2007PA112083.
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Ce travail s’inscrit dans le prolongement de celui de Hirsch-Pugh-Shub (HPS) sur la persistance des laminations normalement hyperboliques, ainsi que celui de Robinson sur la stabilité structurelle des difféomorphismes Axiome A vérifiant la condition de transversalité forte (ATF). On généralise ces théorèmes en introduisant un objet géométrique : les stratifications de laminations. Il s’agit d’une stratification, dont les strates sont des laminations. On propose alors un théorème assurant la persistance de stratifications dont chaque strate est une lamination normalement dilatée. La dynamique est un C1-endomorphisme d’une variété (qui n’est donc pas forcément inversible). La persistance signifie que pour des perturbations C1 de la dynamique préservant la stratification, il existe une stratification proche préservée par la perturbation. Ce théorème dans sa version élémentaire (cas où la stratification est formée d’une seule strate) donne la persistance des laminations normalement dilatées par un endomorphisme, généralisant ainsi le théorème de HPS. Une autre application de ce théorème est la persistance des variétés à bord ou à coins normalement dilatés. Enfin, un difféomorphisme ATF possède deux stratifications de laminations canoniques : celle dont les strates sont les ensembles stables (resp. Instables) de ses pièces basiques. Ainsi, notre théorème implique la persistance des laminations, dont les feuilles sont les fibres d’un fibré sur une surface, préservées par un difféomorphisme, tel que la dynamique induite sur la base soit ATF et que la lamination formée par les fibres qui rencontrent l’ensemble non-errant est normalement hyperboliqueThis manuscript complements the Hirsch-Pugh-Shub (HPS) theory on persistence of normally hyperbolic laminations and the theorem of Robinson on the structural stability of diffeomorphisms that satisfy Axiom A and the strong transversality condition (SA). We generalize these results by introducing a geometric object: the stratification of laminations. It is a stratification whose strata are laminations. We show a theorem which implies the persistence of some stratifications whose strata are normally expanded. The dynamics is a C1-endomorphism of a manifold (which is possibly not invertible). The persistence means that for any C1-perturbation of the dynamics, there exists a close stratification preserved by the perturbation. This theorem in its elementary statement (the stratification is constituted by a unique stratum) gives the persistence of normally expanded laminations by endomorphisms, generalizing HPS theory. Another application of this theorem is the persistence, as stratifications, of submanifolds with boundary or corners normally expanded. Moreover, we remark that SA diffeomorphism gives two canonical stratifications: the stratification whose strata are the (un)stable sets of basic pieces of the spectral decomposition. Thus, our Mains theorem implies the persistence of laminations whose leaves are the fibers of a bundle over a surface, preserved by an diffeomorphism and such that the dynamics induced on the bases is SA and such that the lamination, whose leaves are the fibers which intersect the non-wandering set, is normally hyperbolic
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Mahmood, Ali Hasan. "Optimising the lamination properties of textile composites." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/optimising-the-lamination-properties-of-textile-composites(6a215f92-e200-4e30-8b72-7f599a5e95f3).html.
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Woven glass composites have been used for many years in commercial applications due to their light weight, competitive price and good engineering properties. Absorption of energy by laminated composite material results in damage in various forms, the most common of which is delamination. Inter-laminar fracture causes the layers of composite to separate, resulting in a reduction in stiffness and strength of the composite structure, matrix cracking and in some cases fibre breakage takes place. The aim of this project was to improve the inter-laminar bond strength between woven glass fabric and resin. Air jet texturing was selected to provide a small amount of bulk to the glass yarn. The purpose was to provide more surface contact between the fibres and resin and also to increase the adhesion between the neighbouring layers. These were expected to enhance the resistance to delamination in the woven glass composites.Glass yarns were textured by a Stähle air jet texturing machine. Core-and-effect yarn was produced instead of a simple air textured yarn. Hand loom and vacuum bagging techniques were used for making the fabric and composite panels from both textured and non-textured yarns. Density and fibre volume content were established for physical characterisation. Breaking strength (tenacity) of the yarns and tensile, flexure, inter-laminar shear strength (ILSS) and fracture toughness (mode 1) properties of the composites were determined. Projection microscopy and SEM imaging techniques were used to assess the fractured surfaces of the composite specimens. The yarn tenacity and the tensile properties of the composites were significantly reduced after the texturing process, whereas flexure properties were unchanged. However, significant improvement was observed in the ILSS and fracture toughness of the composites after the texturing process. It was also observed that the composites made from the fabrics with textured yarns in only the weft direction are the most advantageous as they maintained the tensile and flexure properties but have significantly higher inter-laminar shear strength.
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Ben, Charrada Rochdi. "Cohomologie de Dolbeault feuilletée de certaines laminations complexes." Phd thesis, Université de Valenciennes et du Hainaut-Cambresis, 2013. http://tel.archives-ouvertes.fr/tel-00871710.
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Dans cette thèse, nous nous s'intéressons au calcul des groupes de cohomologie de Dolbeault feuilletée H0∗L (M) de certaines laminations complexes. Ceci revient à résoudre le problème du ∂ le long des feuilles ∂Lα = ω. (Ici M est un espace métrique ou une variété dans le cas où L est un feuilletage F.) Trois situations ont été étudiées de manière explicite.1. Soit M = Ω un ouvert de C × R muni du feuilletage F dont les feuilles sont les sections Ωt = {z ∈ C : (z, t) ∈ Ω} ; on dira que F est le feuilletage canonique de Ω. Sous certaines conditions sur Ω et de croissance sur la forme feuilletée ω, nous montrons que l''équation ∂Fα = ω a une solution.2. On se donne une suite (αn)n≥1 strictement croissante avec α1 = −1 et convergeant vers 1. Dans C × R on considère les points A = (0, 1) et An = (0, αn) pour n ≥ 1. Pour tout n ≥ 1, soient Sn la sphère de C × R de diamètre le segment [AnA] et E la réunion de toutes ces sphères. Alors E est un sous-espace métrique compact et connexe de C × R. Soit γ : E −→ E l'homéomorphisme défini par γ(w,u) = (ρn(w),u) lorsque (w, u) ∈ Sn où ρn est la rotation dans C d'angle 2πn. La suspension de γ donne une lamination complexe L dont les feuilles sont des surfaces de Riemann toutes équivalentes à C*. Pour cet exemple, nous montrons que l'espace vectoriel H01(L) est nul.3. On considère la variété M = C × Rn \ {(0, 0)} (les coordonnées d'un point seront notées (z,t)) qu'on munit du feuilletage complexe F défini par le système différentiel dt1 = * * * = dn = 0. Le difféomorphisme γ : (z, t) ∈ Mf7−→ (λz, λt) ∈ M (avec 0 < λ < 1) agit sur M de façon libre et propre ; en plus, c'est un automorphisme de F ; F induit alors sur le quotient M = M/γ (qui est difféomorphe 'à Sn+1 × S1) un feuilletage complexe F par surfaces de Riemann. Nous montrons que les espaces vectoriels de cohomologie de Dolbeault feuilletée H00 F (M) et H01F (M) sont isomorphes à C.
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Park, Jin-Woo. "Core lamination technology for micromachined power inductive components." Diss., Available online, Georgia Institute of Technology, 2004:, 2003. http://etd.gatech.edu/theses/available/etd-06072004-131319/unrestricted/park%5Fjin-woo%5F200405%5Fphd.pdf.
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Robert, Adrian. "Lamination and within-area integration in the neocortex /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1999. http://wwwlib.umi.com/cr/ucsd/fullcit?p9945776.
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Chow, Wei-Yan. "Inhibitory neuron lamination in the developing zebrafish retina." Thesis, University of Cambridge, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708976.
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Curien, Nicolas. "Etude asymptotique de grands objets combinatoires aléatoires." Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00607721.
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Dans ce travail, nous nous sommes intéressés à l'étude asymptotique d'objets combinatoires aléatoires. Deux thèmes ont particulièrement retenu notre attention : les cartes planaires aléatoires et les modèles combinatoires liés à la théorie des fragmentations. La théorie mathématique des cartes planaires aléatoires est née à l'aube de notre millénaire avec les travaux pionniers de Benjamini & Schramm, Angel & Schramm et Chassaing & Schaeffer. Elle a ensuite beaucoup progressé, mais à l'heure où ces lignes sont écrites, de nombreux problèmes fondamentaux restent ouverts. Résumons en quelques mots clés nos principales contributions dans le domaine : l'introduction et l'étude du cactus brownien (avec J.F. Le Gall et G. Miermont), l'étude de la quadrangulation infinie uniforme vue de l'infini (avec L. Ménard et G. Miermont), ainsi que des travaux plus théoriques sur les graphes aléatoires stationnaires d'une part et les graphes empilables dans $\R^d$ d'autre part (avec I. Benjamini). La théorie des fragmentations est beaucoup plus ancienne et remonte à des travaux de Kolmogorov (1941) et de Filippov (1961). Elle est maintenant bien développée (voir par exemple l'excellent livre de J. Bertoin), et nous ne nous sommes pas focalisés sur cette théorie mais plutôt sur ses applications à des modèles combinatoires. Elle s'avère en effet très utile pour étudier différents modèles de triangulations récursives du disque (travail effectué avec J.F. Le Gall) et les recherches partielles dans les quadtrees (travail effectué avec A. Joseph).
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Bastardi, Tommaso. "Valutazione della resistenza all’impatto di laminati compositi." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18572/.
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Nel presente lavoro di tesi è stato studiato il comportamento all’impatto di laminati compositi di varia natura, valutando il danneggiamento ad impatti a bassa velocità. Il comportamento dei diversi campioni è stato osservato prendendo come riferimento un laminato in fibra di carbonio e resina epossidica. Al fine di studiare e migliorare la risposta dei materiali a questo tipo di sollecitazioni sono stati utilizzati diversi approcci: introduzione di strati eterogenei di natura differente e uso di tessuti ibridi (fibre di carbonio e fibre polimeriche). I campioni sono stati quindi sottoposti ad impatti a diversa energia, con lo scopo di valutare l’energia assorbita e la loro deformazione. I provini danneggiati sono stati quindi sottoposti ad analisi di caratterizzazione microscopica, termica e meccanica.
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Holmberg, Veronica. "Creating temperature stimulated paper muscles by printing and lamination." Thesis, Linköping University, Department of Science and Technology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-11766.
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A paper that shows motion when being exposed to heat has in this study been called a paper muscle. A paper muscle can be used for many different applications, e.g. smart advertisement or indicators in printed paper products. The muscles created in the present work were prepared by gluing or printing a polymer layer onto paper. The polymer layers consisted of MELINEX, MYLAR or toner, which are known to expand when exposed to heat. Furthermore, all three material systems showed bending when exposed to heat.
A mechanical bilayer model was implemented and used to quantitatively study the parameters that influence the bending of the muscles. The model indicated that the dimensional changes of the polymer layers relative to that of the copy paper was found to be approximately 0,1-0,5 % within the temperature range 23-60 °C. The experiments showed that the combined dimensional changes within the polymer and paper layers were not linear with respect to temperature, and that there was a significant difference in bending for muscles cut in the MD and in the CD. Also, when assuming that the polymer is the active component, the observed coefficient of thermal expansion was a factor ~10 greater compared to published literature data. These findings led to the conclusion that it was indeed the dimensional changes within the paper that were the dominant cause of the bending. This was confirmed by a muscle, comprising a bilayer of paper cut in the MD and the CD, which bended when exposed to heat. The results also indicate that a large part of the bending could be attributed to the hygrocontraction of paper.
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Mancini, Nicola. "Sviluppo di laminati compositi sensorizzati tramite membrane nanofibrose." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18124/.
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Tra le principali problematiche che affliggono i laminati compositi vi è il cedimento per delaminazione, ovvero il distacco delle lamine costituenti, a seguito delle sollecitazioni meccaniche cui il componente è sottoposto durante la vita d’uso. È di estrema importanza che tale effetto negativo, oltre ad essere minimizzato, venga opportunamente rilevato al fine di intervenire prima che avvenga il cedimento strutturale, evitando danni a persone e cose. Quindi la ricerca di sistemi per il monitoraggio dell’integrità strutturale (Structural Health Monitoring, SHM) è di grande interesse industriale. L’obiettivo del presente lavoro di tesi riguarda l’applicazione di nuovi materiali in laminati compositi con lo scopo di rendere possibile il monitoraggio dell’integrità strutturale del materiale.
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Talarico, Enrico Maria. "Caratterizzazione tribologica in regime lubrificato di laminati d’alluminio." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2016.
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Il presente elaborato si focalizza sulla tribologia delle leghe di alluminio nell’ambito dei processi di laminazione a freddo. Si analizzano in primo luogo la meccanica sollecitativa, i campi deformativi e le velocità del processo produttivo. Viene descritto dunque il fenomeno dell’attrito e i relativi meccanismi, per poi procedere con la contestualizzazione di tali concetti nell’ambito della tribologia della laminazione. Contestualmente si identificano le caratteristiche e i requisiti dei lubrificanti impiegati in questo settore industriale. Si procede infine con indagini tribologiche di tipo pin-on-disk su diverse tipologie di lubrificanti e in differenti regimi di temperatura. È possibile in questo modo valutare l’effetto dei fluidi lubrificanti sul coefficiente d’attrito e sull’addensamento dei detriti di usura.
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Hu, Pao-Jen. "Bending stiffness prediction for Oriented Strandboard by Classical Lamination Theory." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0018/MQ53342.pdf.
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Dastjerdi, Davood Ahmadi. "Dynamics of certain rational maps of degree two." Thesis, University of Liverpool, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316531.
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Ortolani, Jacopo. "Nanofibre elastomeriche per la modifica strutturale di CFRP laminati." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21664/.
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I CFRP laminati posseggono molteplici vantaggi rispetto ai più comuni materiali metallici, in primis, le elevate proprietà meccaniche associate ad un peso ridotto.
Tuttavia, presentano due problematiche in grado di minacciare l’affidabilità a lungo termine del manufatto: la delaminazione e il basso damping, ovvero la scarsa capacità di smorzare le vibrazioni. Lo scopo del presente elaborato di tesi è stato quello di produrre tessuti nanofibrosi elastomerici da integrare nei CFRP laminati al fine di contrastare il fenomeno della delaminazione e migliorarne le capacità smorzanti. I tessuti nanofibrosi sono stati prodotti attraverso la tecnica dell’electrospinning e successivamente caratterizzati morfologicamente tramite analisi SEM, termicamente mediante analisi DSC e meccanicamente tramite prove di trazione. I nanotessuti integrati all’interno del laminato sono stati poi sottoposti a test DCB ed ENF, utili per valutare la tenacità a frattura interlaminare in Modo I e Modo II.
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Quarrie, Cynthia. "Laminations : nostalgia and the undifferentiated narrator in three novels by A.S.Byatt." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=79805.
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This study focuses on the first three historiographic novels in a projected quartet---The Virgin in the Garden, Still Life, and Babel Tower---which historicises what we now refer to as the "crises in representation" that occurred over the late 50s and into the 60s. I trace the figure of the Undifferentiated Narrator, both as it is referred to and read by the characters in the world of the novels, and as it is invoked or broken up by the forms of the narratives themselves.My methodology is outlined in the first section, wherein I place a reading of Byatt's work within the context of contemporary debate regarding the ethics of representation. Then I treat each novel separately, since each is a self-contained novelistic experiment with a different form of literary realism.
In the end I conclude that Byatt's use of polyvocality and multiple histories help us to come to terms with nostalgia for the self-present self, by showing us that it haunts every narrative (and anti-narrative) and is a coercive figure in every life.
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Tiljander, Mia. "Holocene sedimentary history of annual laminations of Lake Korttajärvi, central Finland." Helsinki : University of Helsinki, 2005. http://ethesis.helsinki.fi/julkaisut/mat/geolo/vk/tiljander/.
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Tan, Yu-Eng. "Critical parameters affecting the use of Chengal for structural glue-lamination." Thesis, University of Brighton, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387814.
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Georgala, Petrina A. "Spatial and temporal regulation of cerebral cortex development by the transcription factor pax6." Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/4816.
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Lamina formation in the developing cortex requires precise generation, migration and differentiation of cortical neurons. Cortical projection neurons originate from progenitors of the embryonic dorsal telencephalon. The transcription factor Pax6 is expressed in apical progenitors (APs) throughout corticogenesis in a rostro-lateralhigh to caudo-mediallow gradient. The current studies focus on elucidating the spatial and temporal role of Pax6 in cortical development. I first analysed the cortex of PAX77 transgenic mice that overexpress Pax6 in its normal domains of expression. I show that Pax6 overexpression acts cell-autonomously to reduce the proliferation of late cortical progenitors specifically, resulting in the formation of thinner superficial layers in the PAX77 cortex. Increased levels of Pax6 lengthen the cell cycle of APs and drive the system towards neurogenesis. These effects are specific to late stages of corticogenesis, when superficial layer neurons are normally generated, in cortical regions that express Pax6 at the highest levels. The number of superficial layer neurons is reduced in postnatal PAX77 mice, while radial migration and lamina specification of cortical neurons are not affected by Pax6 overexpression. Then, Pax6 was conditionally inactivated in cortical progenitors at mid- or late-stages of corticogenesis by using a tamoxifen-inducible Emx1-CreER line. I report a novel requirement of Pax6 for continuous suppression of ventral fates and concurrent maintenance of an appropriate dorsal identity in cortical progenitors. Pax6 ablation at either mid- or late-stages of corticogenesis increases the proliferation of late cortical progenitors at all levels across the rostral-caudal axis. In the absence of Pax6 from mid-corticogenesis, late-born neurons are severely under-represented and misspecified in superficial layers of the mutant cortex. Notably, Pax6 inactivation during late corticogenesis also affects superficial laminar fate; although the numbers of late-born cortical neurons are not severely affected in superficial layers of the mutant cortex, substantial numbers of late-born cells fail to migrate to appropriate laminar positions and accumulate in the ventricular zone (VZ) of the postnatal mutant cortex. Collectively, these gain- and loss-of-function studies suggest that disruption of Pax6 levels during different developmental time points leads ultimately to impaired formation of superficial cortical layers but through different cellular and molecular mechanisms.
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Campeti, Jessica. "Modifica strutturale di CFRP laminati mediante integrazione di tessuti nanofibrosi." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/17956/.
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I CFRP laminati presentano molteplici vantaggi rispetto ai materiali metallici, primi tra tutti elevate prestazioni meccaniche unite ad un peso ridotto. Tuttavia, possiedono delle problematiche che minacciano l’affidabilità di tali manufatti durante la loro vita d’uso, rappresentate dal fenomeno della delaminazione e dalla scarsa capacità di smorzare le vibrazioni (damping). Lo scopo del presente elaborato di tesi è stato di produrre tessuti nanofibrosi da integrare in CFRP laminati al fine di contrastare il fenomeno della delaminazione e migliorarne il damping. I nanotessuti, prodotti mediante electrospinning, sono stati completamente caratterizzati: morfologicamente tramite analisi SEM, termicamente attraverso analisi DSC e meccanicamente mediante prove di trazione. I laminati compositi nanomodificati sono stati sottoposti a test DCB (Double Cantilever Beam) e ad analisi DMA (dinamico-meccanica). I test DCB, utili per valutare la tenacità a frattura interlaminare in Modo I, hanno mostrato che i tessuti nanofibrosi risultano efficaci nel contrastare il fenomeno della delaminazione. I test DMA hanno evidenziato, invece, una scarsa capacità dei nanotessuti nell’incrementare il damping dei CFRP, oltre a stabilire che la presenza del nanorinforzo non altera significativamente le proprietà termo-meccaniche proprie del laminato CFRP.
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Pondini, Alessio. "Tenacizzazione di laminati compositi mediante l'utilizzo di nanofibre in PVDF." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8463/.
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Analisi riguardante la tenacizzazione della matrice di laminati compositi. Lo scopo è quello di aumentare la resistenza alla frattura di modo I e, a tal proposito, sono stati modificati gli interstrati di alcuni provini tramite l’introduzione di strati, di diverso spessore, di nanofibre in polivinilidenfluoruro (PVDF). La valutazione di tale metodo di rinforzo è stata eseguita servendosi di dati ottenuti tramite prove sperimentali svolte in laboratorio direttamente dal sottoscritto, che si è occupato dell’elaborazione dei dati servendosi di tecniche e algoritmi di recente ideazione. La necessità primaria per cui si cerca di rinforzare la matrice risiede nel problema più sentito dei laminati compositi in opera da molto tempo: la delaminazione. Oltre a verificare le proprietà meccaniche dei provini modificati sottoponendoli a test DCB, si è utilizzata una tecnica basata sulle emissioni acustiche per comprendere più approfonditamente l’inizio della delaminazione e i meccanismi di rottura che si verificano durante le prove. Quest’ultimi sono illustrati servendosi di un algoritmo di clustering, detto Fuzzy C-means, tramite il quale è stato possibile identificare ogni segnale come appartenente o meno ad un determinato modo di rottura. I risultati mostrano che il PVDF, applicato nelle modalità esposte, è in grado di aumentare la resistenza alla frattura di modo I divenendo contemporaneamente causa di un diverso modo di propagazione della frattura. Infine l’elaborato presenta alcune micrografie delle superfici di rottura, le quali appoggiano i risultati ottenuti nelle precedenti fasi di analisi.
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Pedicone, Alfonso. "Valutazione degli effetti di invecchiamento termico su laminati in CFRP." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/9665/.
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Valutazione degli effetti ambientali sulle caratteristiche meccaniche di materiali compositi avanzati.
Laminati in fibra di carbonio e resina epossidica, sottoposti a cicli termici, sono stati analizzati per determinare le resistenze strutturali degli stessi. I valori ottenuti sono stati comparati con materiale non invecchiato.
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川平, 友規, and TOMOKI kAWAHIRA. "Tessellation and Lyubich–Minsky laminations associated with quadratic maps, I: pinching semiconjugacies." Cambridge University Press, 2009. http://hdl.handle.net/2237/14319.
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Icha, Jaroslav. "Ganglion cell translocation across the retina and its importance for retinal lamination." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-218914.
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Correct layering (lamination) of neurons in the central nervous system (CNS) is critical for the tissue functionality. Neuronal lamination is established during development, when the majority of neurons have to move from their birthplace to the appropriate layer, where they function. Therefore, to grasp the logic of CNS development, it is essential to understand the kinetics and modes of the variety of neuronal translocation events. Most of our knowledge about neuronal translocation has been gained using fixed tissue or ex vivo imaging, which is not ideal for such a dynamic process heavily dependent on the surrounding environment. To avoid these limitations, I combined translucent zebrafish embryos with light sheet fluorescence microscopy, which together enabled gentle in toto imaging of neuronal translocation.
I studied the translocation of retinal ganglion cells (RGCs) across the developing zebrafish retina. RGCs are the first neurons that differentiate in the vertebrate retina and are born in a proliferative zone at the retinal apical side. From here, they move basally, spanning the complete apico-basal length of the tissue. They are destined to occupy the most basal layer, where their axons form the optic nerve. Although it was described that RGCs move their soma while being attached to both apical and basal sides of the retina, the kinetics and cell biological mechanisms of somal translocation remained unknown.
Extracting single cell behavior of RGCs from high-resolution movies of their translocation allowed for quantitative analysis of RGC movement. I revealed that RGCs cross the retina in less than two hours in a directionally persistent manner. The movement of RGC soma is a cell autonomously generated process, which requires intact microtubules and actin-dependent basal attachment of cells for speed and efficiency. Unexpectedly, interference with somal translocation leads to a shift towards a multipolar migratory mode, previously not observed for RGCs, in which they temporarily lose both apical and basal attachment and apico-basal polarity. The multipolar mode is overall slower and less directionally persistent, but still allows RGCs to reach the basal retina. However, when RGC translocation is inhibited completely, they differentiate ectopically in the center of the retina, which in turn triggers the formation of ectopic layers of later born neurons. These results highlight the importance of establishing the basal layer of ganglion cells for ensuing retinal lamination. Overall, I generated important advances in the understanding of neuronal translocation and lamination, which might be relevant for other parts of the CNS.
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Joy, Ryan Mears. "Dcbld2/esdn Is Essential For Proper Optic Tract Formation And Retinal Lamination." ScholarWorks @ UVM, 2016. http://scholarworks.uvm.edu/graddis/563.
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ABSTRACT
The Discoidin, CUB and LCCL domain-containing protein 2 (DCBLD2/ESDN/CLCP1) is a type-I, transmembrane receptor that mediates diverse cellular processes such as angiogenesis, vascular remodeling, cellular migration and proliferation. Identification of DCBLD2 in a proteomics screen to identify substrates of Src family tyrosine kinases that bind the Src homology 2 domain of CT10 regulator of kinase-Like (CrkL), a critical scaffolding protein for neuronal development, led to a need for further characterization of the protein. To elucidate the role of this interaction and potential novel function of DCBLD2, an in vivo approach utilizing Danio rerio (zebrafish) was conducted. dcbld2 was found localized in neuronal tissues during development, with strong expression in the retina. Knockdown of the protein led to a deficiency of retinal ganglion cells and the optic tracts, or nerve bundles, they project to innervate the brain. Serial sections revealed malformation of the normally discrete layering of retinal cell types, and smaller eye area overall.
These findings suggest a role for dcbld2 in developing nervous tissue, specifically neuronal migration during interkinetic nuclear migration. While it is has been shown that dcbld2 has a role in the developmental patterning of intersegmental vessels in the tail of zebrafish, the protein has not been investigated in the context of neurogenesis. The loss of RGCs and lamination defects observed in the eye, along with its association with the CrkL-SH2 domain, implicate it in processes that allow for the proper differentiation of neurons. This study has brought us further down the path to understanding the multiple functions of the receptor; however, further studies are required to delineate the exact mechanistic function of the dcbld2 receptor.
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Lin, Pei-Lun. "Ultrabubble : a new lamination technique for a high-performance ultrasound contrast agent." Thesis, University of Cambridge, 2010. https://www.repository.cam.ac.uk/handle/1810/252197.
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Nocito, Christophe. "Développement d’un textile intégrant des cellules photovoltaïques pour application de protection solaire store enroulable." Thesis, Lille 1, 2010. http://www.theses.fr/2010LIL10195/document.
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Le développement de matériaux permettant la fabrication de bâtiments à « énergie positive » est une préoccupation importante. Les solutions existantes consistent soit à économiser de l’énergie, soit à la produire. Nous proposons de développer un store photovoltaïque rassemblant ainsi les deux fonctions : diminuer la consommation d’énergie en apportant une régulation thermique et la production de l’énergie électrique.Le produit ainsi conçu, peut aussi être utilisé dans des domaines autonomes (camping-cars, bateaux) afin de favoriser une utilisation nomade ou des domaines connectés au réseau électrique (résidentiels). Le développement d’une telle application nécessite l’utilisation de panneaux photovoltaïques souples, légers, fins, dont les rendements de production surfaciques sont les meilleurs possibles. La possibilité de rangement du panneau photovoltaïque autour d’un tube cylindrique permet d’améliorer leur intégration architecturale et un encombrement minimum.A cette fin, il est utile d’intégrer des capteurs photovoltaïques au textile. L’intégration des cellules photovoltaïques est réalisée par un procédé de lamination continu différent des procédés conventionnels.Afin de s’assurer de la faisabilité d’un tel produit, des prototypes ont été réalisés pour connaître les difficultés rencontrées lors des étapes successives de montage. De plus, ceux-ci ont permis d’effectuer des mesures dans des conditions réelles et comparer ainsi la solution développée aux solutions existantesDeveloping new materials to make positive energy buildings is an important issue. Solutions currently in existence are either energy saving or energy production. We are proposing a photovoltaic awning which has both functions: decreasing the energy consumption and producing the electricity.This new product can be used as an off-grid system (RV-awning, marine) for nomad use or as an on-grid systems (residential). Such application development needs the photovoltaic technology thin, light, flexible and as efficient as possible. The storage space around the cylindrical roll allows improving the architectural integration and minimal size.In order to realize this novel product, the bonding of photovoltaic cells to the textile structure (lamination) is necessary. This part of the project has been realized with a new roll-to-roll process different from the conventional one.Prototypes have been made in order to acquire knowledge and experience related to difficulties that may occur at the next step of the realization. Moreover, various tests have been done to compare other technologies to the photovoltaic awning
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Both, Jan [Verfasser]. "Tragfähigkeit von CFK-Metall-Laminaten unter mechanischer und thermischer Belastung / Jan Both." München : Verlag Dr. Hut, 2014. http://d-nb.info/105237462X/34.
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Pottmeyer, Florentin [Verfasser]. "Schädigungsverhalten von in CFK-Laminaten eingebetteten Inserts unter bauteilnahen Beanspruchungen / Florentin Pottmeyer." Karlsruhe : KIT Scientific Publishing, 2017. http://www.ksp.kit.edu.
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Shah, Urvi. "Development of MEMS power inductors with submicron laminations using an automated electroplating system." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19715.
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Thesis (M. S.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2008.Committee Chair: Allen, Mark G.; Committee Member: Divan, Deepakraj M.; Committee Member: Taylor, David G.
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Somkun, Sakda. "Magnetostriction and magnetic anisotropy in non-oriented electrical steels and stator core laminations." Thesis, Cardiff University, 2010. http://orca.cf.ac.uk/55184/.
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Magnetostriction is a source of vibration and acoustic noise of electrical machines and it can be highly anisotropic even in non-oriented electrical steel. Understanding of magnetostriction under magnetisation and stress conditions present in stator core laminations can help predict the core vibration and radiated noise. Anisotropy of magnetostriction of a 0.50 mm thick non-oriented steel investigated in Epstein strips cut at angles to the rolling direction was much higher than the anisotropy of its magnetic and elastic properties because magnetostriction arises directly from magnetic domain processes. Magnetostriction of a disc sample of the 0.50 mm thick steel was measured under ID and 2D magnetisation and compared with that of a 0.35 mm thick steel with different anisotropy level. A 2D magnetostriction model and an analytical simple domain model were used to explain the experimental results. 2D magnetostriction is dependent on the magnetostrictive anisotropy and the ratios of the transverse to longitudinal magnetostriction. AC magnetostriction measured in the disc samples was larger than in the Epstein strips due to the form effect. An induction motor model core was constructed from the 0.50 mm thick steel for measurements of localised flux density and deformation. Core deformation due to Maxwell forces was calculated. Magnetostriction and specific power loss of the core material under magnetisation conditions present in the core was measured. The localised loss in the stator teeth, tooth roots and back iron differed from their average value by 52%, 19% and 36% due to the magnetic anisotropy. Magnetostriction was estimated to be about 55% and 80% of the radial deformation at the tooth root and back iron regions respectively. Stator teeth deformed asymmetrically and the magnitude of the space harmonics increased due to the magnetostrictive anisotropy. The measurement results inferred that 2D magnetostriction can be predicted from the magnetostrictive anisotropy and vice versa. Also, core deformation and vibration of large machines, where segmented stator core laminations are used, can be estimated analytically with the knowledge of 2D magnetostriction of the core material.
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Fleury, Sophie. "Laminations sédimentaires et variabilité climatique et océanographique haute-fréquence sur la marge péruvienne." Thesis, Bordeaux, 2015. http://www.theses.fr/2015BORD0068/document.
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Le Système d’Upwelling Péruvien (PUS) et la Zone à Oxygène minimum (OMZ) qui y est associée font partie des régions les plus marquées par les variations climatiques de type El Niño Southern Oscillation (ENSO), tant à l’échelle interannuelle qu’à l’échelle décennale. Or, peu d’enregistrements de l’impact de l’ENSO sur cette zone géographique atteignent ces résolutions temporelles, malgré des conditions propices à la conservation de dépôts sédimentaires laminés.Nous avons analysé ces archives sédimentaires à l’échelle de la lamine et en utilisant des marqueurs sédimentologiques, micro paléontologiques et géochimiques afin de retracer les variations de tous les paramètres susceptibles de répondre aux changements climatiques(précipitations, productivité, dénitrification, températures océaniques de surface). Cette approche nous a permis de disposer d’un enregistrement complet des conditions environnementales dans l’OMZ du Pérou à des échelles pluri-annuelle à multidécennale, ce qui est inégalé sur des périodes au-delà du dernier millénaire. Nous avons ainsi pu mettre en évidence une forte empreinte de la circulation de Walker sur le PUS. Cet impact est modulé par les régions extra tropicales de l’hémisphère Nord, en particulier par l’Oscillation Nord-Atlantique (NAO) à l’échelle multidécennale, par la circulation thermohaline à l’échelle centennale et par l’Anticyclone Sibérien à l’échelle millénaireThe Peruvian Upwelling System (PUS) and the corresponding Oxygen Minimum Zone (OMZ) are part of the regions where the imprint of climatic variations due to El Niño Southern Oscillation (ENSO) at the interannual and multidecadal timescales is the strongest. However,only a few records of ENSO-like climatic variability reach such short timescales in thisgeographical area, despite prevailing conditions favorable to the preservation of laminatedsediments. We analyzed these sedimentary archives at the scale of the lamination, using sedimentology, micropaleontology and geochemistry. The aim was to trace variations in all parameters responding to climatic changes (rainfall, productivity, denitrification, sea surfacetemperatures). This approach has provided a full record of environmental conditions in thePeruvian OMZ at multiannual and multidecadal timescales for the first time on time intervals exceeding the last millennium. We thus evidenced a strong imprint of the Walker circulation on the PUS. This impact is paced by the extratropical northern hemisphere, especially by the North Atlantic Oscillation (NAO) at the multidecadal timescale, by the thermohaline circulation at the centennial timescale and by the Siberian High at the millennial timescale
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Oscarsson, Jan. "Strength grading of structural timber and EWP laminations of Norway spruce : Development potentials." Licentiate thesis, SP Sveriges Tekniska Forskningsinstitut, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-23757.
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Strength grading of structural timber is a process by which value is added to sawn products. It is to the greater part carried out using machine grading based on statistical relationships between so called indicating properties and bending strength. The most frequently applied indicating property (IP) on the European market is the stiffness in terms of average modulus of elasticity (MOE) of a timber piece, although MOE is a material property that varies within timber. A major limitation of today’s grading methods is that the described relationships are relatively poor, which means that there is a potential for more accurate techniques. The main purpose of this research has been to initiate development of more accurate and efficient machine grading methods. Strength of timber is dependent on the occurrence of knots. At the same time, knot measures applied as indicating properties until today have shown to be poor predictors of strength. However, results from this research, and from previous research, has shown that not only size and position of knots but also fibre deviations in surrounding clear wood are of great importance for local stiffness and development of fracture under loading. Thus, development of new indicating properties which take account of knots as well as properties of surrounding fibres, determined on a very local scale, was considered as a possible path towards better strength grading. In the research, results from contact-free deformation measurements were utilized for analysis of structural behaviour of timber on both local and global level. Laser scanning was used for detection of local fibre directions projected on surfaces of pieces. Scanned information, combined with measures of density and average axial dynamic MOE, was applied for calculation of the variation of local MOE in the longitudinal board direction. By integration over cross-sections along a piece, a stiffness profile in edgewise bending was determined and a new IP was defined as the lowest bending MOE along the piece. For a sample of Norway spruce planks, a coefficient of determination of 0.68 was achieved between the new IP and bending strength. For narrow side boards to be used as laminations in wet-glued glulam beams, the relationship between IP and tensile strength was as high as 0.77. Since the intended use of the narrow boards was as laminations in wet-glued beams, the possibility of grading them in a wet state was also investigated. Grading based on axial dynamic excitation and weighing gave just as good results in a wet state as when the same grading procedure was applied after drying. It was also found that the relationship between the new IP and strength was dependent on what scale the IP was determined. Optimum was reached for moving average MOE calculated over lengths corresponding with approximately half the width of investigated pieces. Implementation of the new IP will result in grading that is more accurate than what is achieved by the great majority of today’s grading machines. The new method will probably also be particularly favourable for development of engineered wood products made of narrow laminations.Hållfasthetssortering av konstruktionsvirke innebär att värdet på sågade produkter ökar. Sorteringen genomförs oftast med maskinella metoder baserade på statistiska samband mellan s.k. indikerande egenskaper och böjhållfasthet. Den indikerande egenskap (indicating property, IP) som är vanligast på den Europeiska marknaden är styvhet uttryckt som ett medelvärde för elasticitetsmodulen (modulus of elasticity, MOE) i ett virkesstycke, trots att MOE är en materialegenskap som varierar i virket. En betydande begränsning med dagens sorteringsmetoder är att de beskrivna sambanden är förhållandevis svaga, vilket innebär att det finns en potential för metoder med högre noggrannhet. Det huvudsakliga syftet med detta doktorandprojekt har varit att initiera en utveckling mot sådana metoder. Hållfasthet hos virke är beroende av förekomst av kvistar. Samtidigt har de kvistmått som fram till idag kommit till användning visat sig vara dåliga prediktorer av hållfasthet. Resultat från såväl denna som tidigare forskning har dock visat att inte bara kvistars storlek och läge, utan också variationen i fiberriktning i omgivande träfibrer, är av stor betydelse för lokal styvhet och brottförlopp under inverkan av last. Utveckling av nya IP som tar hänsyn till såväl kvistar som omgivande träfibrers egenskaper fastställda på mycket lokal nivå bedömdes vara en möjlig väg för att uppnå bättre hållfasthetssortering. I detta doktorandprojekt användes beröringsfri deformationsmätning för analys av det strukturella beteendet hos virkesstycken på såväl lokal som global nivå. Laserskanning utnyttjades för detektering av lokala fiberriktningar projicerade på virkesstyckenas ytor. Med utgångspunkt från skannad information, virkesdensitet och medelvärde för axiell dynamisk elasticitetsmodul kunde variationen i lokal elasticitetsmodul i virkesstyckenas längdriktning bestämmas. Genom integration över tvärsektioner längs ett virkesstycke kunde en profil över hur böjstyvheten i styva riktningen varierade i virkesstyckets längdriktning beräknas. En ny IP definierades som den lägsta elasticitetsmodulen i böjning utmed virkesstyckets längd. För ett urval av granplankor erhölls en förklaringsgrad på 0.68 mellan den nya indikerande egenskapen och böjhållfasthet. För smala sidobrädor avsedda att användas som lameller i våtlimmade limträbalkar var motsvarande förklaringsgrad mellan samma IP och draghållfasthet så hög som 0.77. Eftersom sidobrädorna var avsedda att användas som lameller i våtlimmade balkar genomfördes en studie avseende möjligheten att hållfasthetssortera i vått tillstånd med hjälp av axiell dynamisk excitering och vägning. Det visade sig att sådan sortering gav lika bra resultat som då samma metod användes efter torkning. Sambandet mellan den nya indikerande egenskapen och hållfasthet visade sig också vara beroende av på vilken lokal nivå som egenskapen beräknades. Optimum uppnåddes då den bestämdes som ett glidande medelvärde beräknat över en längd motsvarande ungefär halva virkesstyckets höjd. Implementering av den nya sorteringsmetoden kommer att resultera i sortering som är noggrannare än vad som kan erhållas med det stora flertalet av de sorteringsmetoder som finns idag. Den nya indikerande egenskapen kommer sannolikt att bli särskilt gynnsam att använda för utveckling av ingenjörsmässiga träprodukter bestående av smala lameller.
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Decicio, Brendan. "The Layered Frames of Performed Tabletop: Actual-Play Podcasts and the Laminations of Media." BYU ScholarsArchive, 2020. https://scholarsarchive.byu.edu/etd/8737.
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Despite their sudden growth in popularity, the role-playing actual-play podcasts have either been ignored or grouped with the genre of audio drama in prior scholarly works. Examination using frame analysis shows, however, that these podcasts are distinct in their engagement of the audience on multiple, simultaneous levels; levels which correspond with well-known media genres such as Documentary, Fiction, and Game Play. Each frame has its own layer of identities, conduct, and avenue for appealing to audiences just as these genres have their own distinct appeals. Through the combinations of these frames, familiar tropes and techniques such as Short-Form Improv and Campbell's monomyth are broadened and challenged, and identities become entangled in this post-modern medium. Delineating the features of these frames and exploring their interactions and interconnectivity not only helps to distinguish the actual-play podcast as its own distinct podcast genre, but also highlights the potential for using such frames or frame analysis in other media forms.
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Capogreco, Vincenzo. "Analisi delle proprietà meccaniche di laminati in CFRP soggetti a invecchiamento igroscopico." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019.
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La seguente tesi illustra lo svolgimento di un'analisi sperimentale eseguita in due fasi principali. La prima fase è stata svolta presso i laboratori dell’Hangar di Forli, in cui i provini sono stati realizzati, danneggiati con impatti BVID ed invecchiati igroscopicamente. La seconda fase è stata svolta nei laboratori ENEA di Faenza-Unità Tecnica Tecnologie dei Materiali, in cui sono stati effettuati i test a compressione.
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Foschini, Lorenzo. "Studio della produzione di provini laminati manualmente per prove di caratterizzazione meccanica." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019.
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I materiali compositi nascono dall'unione di due o più materiali differenti, che conferisce al prodotto finale proprietà superiori rispetto a quelle dei singoli.
Grazie alle qualità dimostrate e all’intercambiabilità degli elementi costituenti, è stato possibile allargare il campo di utilizzo dei materiali compositi alla maggior parte dei settori dell’industria moderna; uno dei settori che maggiormente risente dell’influenza di questi materiali è il settore aereonautico, che, grazie all’implementazione di tecnologie, è riuscito ridurre drasticamente la presenza dei materiali convenzionali, ottimizzando le caratteristiche del velivolo stesso.
In questo elaborato sono stati presi in considerazione i CFRP (carbon/epoxy) in configurazione cross-ply, approfondendone le procedure di corretta laminazione tramite una campagna sperimentale.
L’obiettivo è stato produrre una serie di provini da sottoporre a verifiche di resistenza meccanica a compressione, sia in condizioni ottimali, sia simulando condizioni di service per mezzo di una serie d’impatti a basse velocità (BVID – Barely Visible Impact Damages).
La laminazione e le procedure d’impatto si sono svolte presso il laboratorio hangar dell’università di Ingegneria e Architettura con sede a Forlì, nel quale è stato possibile effettuare un processo di laminazione in autoclave e compiere impatti centrali al provino e nelle prossimità del bordo.
La caratterizzazione del materiale, sottoposto a prove di compressione, è stata effettuato tramite l’impiego di attrezzature all’avanguardia presso il centro di ricerca ENEA, Unità Tecnica Tecnologie dei Materiali di Faenza.
Il seguente elaborato descrive i mezzi e le considerazioni necessarie per portare a termine l’attività sperimentale.
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Cantarini, Valentina. "Valutazione dell'effetto di cicli termici sulla risposta ad impatto di laminati CFRP." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/5676/.
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