Duotone Surfaces: Division of a Closed Surface into Exactly Two Regions

In this thesis work, our main motivation is to create computer aided art work which can eventually transform into a sculpting tool. The work was inspired after Taubin’s work on constructing Hamiltonian triangle strips on quadrilateral meshes. We present an algorithm that can divide a closed 2-manifold surface into exactly two regions, bounded from each other by a single continuous curve. We show that this kind of surface division is possible only if the mesh approximation of a given object is a two colorable quadrilateral mesh. For such a quadrilateral mesh, appropriate texturing of the faces of the mesh using a pair of Truchet tiles will give us a Duotone Surface. Catmull-Clark subdivision can convert any given mesh with arbitrary sided polygons into a two colorable quadrilateral mesh. Using such vertex insertion schemes, we modify the mesh and classify the vertices of the new mesh into two sets. By appropriately texturing each face of the mesh such that the color of the vertices of the face match with the colored regions of the corresponding Truchet tile, we can get a continuous curve that splits the surface of the mesh into two regions. Now, coloring the thus obtained two regions with two different colors gives us a Duotone Surface

Re: Ornament

Re:Ornament calls for a rethinking of ornament within the history and practice of design, urging a broad reconsideration of ornament’s value and a complete reimagining of ornament’s future potential. Charting the arc of ornament in the Western tradition, this thesis reexamines the impact of modernism’s rejection of ornament—and, with it, its embedded culture, history, knowledge and craft. Studying ornament’s structure as a language, I make the case for ornament’s inherent beauty and excess and speculate on how ornament could apply to thinking and making beyond design. Through graphic form, material exploration and pattern thinking, I negotiate these complexities with work that is intrinsically structural, deeply ornamental and often a hybrid of the material and the digital, the hand and the machine. As such, my work is not only a response to—or rebuttal of—modernism, but also a call to action and an invitation to remember, recalibrate and remake our perception and use of ornament today

Characterization of nodule-specific, SLAC and MATE membrane transporters in Medicago truncatula

Legumes play a crucial role in sustainable agriculture because of their intrinsic ability to reduce atmospheric N2 into NH3 via symbiotic nitrogen fixation (SNF). SNF is carried out in the symbiosome, a quasi-organelle containing endosymbiotic rhizobial bacteria in the cytoplasm of infected cells of the nodule. Therefore, the bacteria are surrounded by a symbiosome membrane (SM), which is derived from the plant plasma membrane during infection. SNF requires constant nutritional exchanges between symbionts, including reduced carbon (dicarboxylates) from the plant for reduced nitrogen (NH4+) from the bacteroids. This exchange of nutrients and signals is fundamental to SNF and occurs through various transporters in several membranes, and critically through the SM. However, despite the fact that many nodule-specific or high-expressed putative transport genes have been identified in nodules at the genetic level, little is still known about their biochemical and physiological roles for SNF. Thus, we functionally characterized two transporter genes exclusively or highly expressed in the nodules of Medicago truncatula, a well-established legume model species: MtSLAH1 (Medtr4g049640, TCDB 2.A.16.5) of the Tellurite-resistance/Dicarboxylate transporter family, and MtMATE30 (Medtr7g082810, TCDB 2.A.66.1) of the Multidrug and toxic compound Extrusion family. There are seven SLAC (Slow Anion Channel associated) and 70 MATE (Multidrug and Toxic compound Extrusion) family members in the M. truncatula genome. MtSLAH1 is the SLAC transporter with highest expression value in nodules among seven members. Its expression is reduced 5-fold in 2 days after application of nitrate, a known SNF repressor. MtSLAH1 is highly expressed in infected cells and requires bacteroid differentiation for induction. MtSLAH1 channel permeability to dicarboxylates was tested by patch-clamp of Xenopus oocytes, but no current was detected. MtSLAH1 either requires a cofactor for activation or facilitates the efflux a different anion (e.g., nitrate, chloride). On the other hand, MtMATE30 is the MATE gene with highest expression in nodules. It is induced 100-fold by low nitrogen while strongly repressed by nitrate, suggesting a role in symbiotic nitrogen fixation. It starts to express in immature nodules (6 days post-inoculation, dpi), reaches its peak in young, mature nodules (10 dpi) and maintains consistent expression in older nodules. It is expressed in all nodule zones, except the meristem. MtMATE30 canonically belongs to a phylogenetic clade that includes transporters with affinity to alkaloids. Trigonelline is a widely distributed alkaloid and commonly found in legumes. Previous research showed that rhizobia are able to catabolize trigonelline by the trc gene located in the rhizobial pSym megaplasmid. We confirmed the presence of trigonelline in nodules of M. truncatula and showed MtMATE30 affinity to trigonelline in a heterologous bacteria system. Altogether, MtMATE30 may be participating in alkaloid metabolism of nodule cells, although its precise physiological role in symbiotic nitrogen fixation still requires further investigation. In the big picture, these two membrane transporters studied here are only two examples among thousands of transporters exclusively expressed in nodule. The legume research community needs to focus more efforts to understand how legumes and rhizobia communicate and cooperate to fix nitrogen in order to enhance SNF efficiency in legume crops, and possibly to eventually extend it into non-legume crops

Enhancing Mesh Deformation Realism: Dynamic Mesostructure Detailing and Procedural Microstructure Synthesis

Propomos uma solução para gerar dados de mapas de relevo dinâmicos para simular deformações em superfícies macias, com foco na pele humana. A solução incorpora a simulação de rugas ao nível mesoestrutural e utiliza texturas procedurais para adicionar detalhes de microestrutura estáticos. Oferece flexibilidade além da pele humana, permitindo a geração de padrões que imitam deformações em outros materiais macios, como couro, durante a animação. As soluções existentes para simular rugas e pistas de deformação frequentemente dependem de hardware especializado, que é dispendioso e de difícil acesso. Além disso, depender exclusivamente de dados capturados limita a direção artística e dificulta a adaptação a mudanças. Em contraste, a solução proposta permite a síntese dinâmica de texturas que se adaptam às deformações subjacentes da malha de forma fisicamente plausível. Vários métodos foram explorados para sintetizar rugas diretamente na geometria, mas sofrem de limitações como auto-interseções e maiores requisitos de armazenamento. A intervenção manual de artistas na criação de mapas de rugas e mapas de tensão permite controle, mas pode ser limitada em deformações complexas ou onde maior realismo seja necessário. O nosso trabalho destaca o potencial dos métodos procedimentais para aprimorar a geração de padrões de deformação dinâmica, incluindo rugas, com maior controle criativo e sem depender de dados capturados. A incorporação de padrões procedimentais estáticos melhora o realismo, e a abordagem pode ser estendida além da pele para outros materiais macios.We propose a solution for generating dynamic heightmap data to simulate deformations for soft surfaces, with a focus on human skin. The solution incorporates mesostructure-level wrinkles and utilizes procedural textures to add static microstructure details. It offers flexibility beyond human skin, enabling the generation of patterns mimicking deformations in other soft materials, such as leater, during animation. Existing solutions for simulating wrinkles and deformation cues often rely on specialized hardware, which is costly and not easily accessible. Moreover, relying solely on captured data limits artistic direction and hinders adaptability to changes. In contrast, our proposed solution provides dynamic texture synthesis that adapts to underlying mesh deformations. Various methods have been explored to synthesize wrinkles directly to the geometry, but they suffer from limitations such as self-intersections and increased storage requirements. Manual intervention by artists using wrinkle maps and tension maps provides control but may be limited to the physics-based simulations. Our research presents the potential of procedural methods to enhance the generation of dynamic deformation patterns, including wrinkles, with greater creative control and without reliance on captured data. Incorporating static procedural patterns improves realism, and the approach can be extended to other soft-materials beyond skin

Elizabeth I, the Subversion of Flattery, and John Lyly\u27s Court Plays and Entertainments

This study considers how John Lyly\u27s characters who are allegorical representations of Elizabeth validate the queen, but at the same time raise troubling issues as to her true nature. Theodora Jankowski looks at both the light and the dark side of the Elizabeth character in each of Lyly\u27s court plays, while at the same time considering how that allegory works in terms of the various issues Lyly debates within the plays. She reveals the fraught nature of John Lyly\u27s relationship to Queen Elizabeth. He was not the first creative artist to introduce subversive undercurrents in entertainments designed to flatter the queen. However, Jankowski demonstrates how Lyly, while praising the queen and accepting her beneficence, simultaneously manages to present his audiences with the dark queen, the opposite side of the positive image of the Queen of England.https://scholarworks.wmich.edu/mip_ltsd/1000/thumbnail.jp

Re-surface: the novel use of deployable and actively-bent gridshells as reusable, reconfigurable and intuitive concrete shell formwork

Following a well-documented rise in the popularity of concrete shell application in the 20th century, thin concrete shells have experienced a global decline despite their potential as efficient structures with an economy of material use with aesthetics benefits. This phenomenon is subject to geographically determined socio-economic conditions and competition from other building solutions as a result of technological advancement in alternative construction systems. Importantly, their decline was attributed to limitations inherent to concrete shell formwork and construction methods. Being able to produce efficient shaping did not ensure that this method of construction is most cost efficient as it still remains difficult to construct double curved surfaces. The thesis addresses the limitations associated with past and present concrete shell building by proposing the use of actively-bent gridshells as re-configurable and reusable formwork for concrete shells to be designed and built. The hypothesis uses deployable scissor-jointed actively-bent gridshells as re-configurable and reusable formwork for concrete shell construction. This was developed from a series of Flash research (Benjamin, 2012) as student construction workshops to investigate the design and creation of actively-bent gridshells held between December 2008 and March 2011 in Sheffield. In this study, to understand this new system, scaled models of actively-bent gridshells were used as preliminary design aid. Deployed into three dimensional forms from a flexible flat grid mat, the structures were rigidized by bracing through triangulation restraints. The temporary rigid structure was subsequently enveloped with fabric onto which concrete was applied to create the concrete shell, thus acting as formwork. This formwork was then removed following the curing of the concrete cast to be reused repeatedly, or reconfigured into another concrete shell form. Hence, the thesis draws on the concepts, principles and ideas pertaining to three key architectural technologies: 1. concrete shell, 2. actively-bent gridshells and 3.fabric formwork. The thesis then presents a series of four prototype concrete shells constructed from different materials spanning between 1.3 meters and 2.45 meters in the workshops at the University of Edinburgh built between August 2014 and September 2015. For each experimental construction, the process of gridshell construction, fabric formwork preparation, concrete casting, gridshell formwork decentring and different design elements of openings, edges and anchorage abutments were analysed and discussed under the themes of construction, architectural tectonics and structure. The tectonic of process and material is understood and discussed based on the idea of stereogeneity (Manelius, 2012). Specifically, the relationship between gridshell as formwork and the concreting process was studied, analysed and assimilated in concrete shells built with progressive sophistication and elegance, culminating in a doubly-curved concrete shell that demonstrated both synclastic and anticlastic geometries, with further abutment simplification, edge leaning and physical openings incorporation. The study concludes with a physical concrete shell model formed by applying concrete onto fabric formwork to cover the Weald and Downland Jerwood gridshell. In the 1:20 scaled model, the proposed method is speculatively applied onto fabric stretched between pre-determined curvatures of the as-built gridshell. This formwork was subsequently removed for reuse, re-deployed and reconfigured. Using finite element analysis, the structural behaviour of the gridshell made of glass-fibre reinforced tubes and structural characteristics of the resultant concrete shell was checked. The interaction between the three technologies are discussed architectonically and structurally to inform guidelines for potential life-scale application. The thesis evidences the feasibility of the proposed system. It re-purposes a scaled model of a deployable gridshell as a physical modelling tool to facilitate concrete shell design, for both pure compression shells and "improper" shells, demonstrating its adaptability. It also promotes and reinvigorates concrete shells as possible architectural systems serving to instigate future research to revive concrete shell construction as an intelligent and intuitive way of creating structures with material economy, structural efficiency and visual elegance

An exploration and validation of computer modeling of evolution, natural selection, and evolutionary biology with cellular automata for secondary students.

The Evolutionary Tool Kit, a new software package, is the prototype of a concept simulator providing an environment for students to create microworlds of populations of artificial organisms. Its function is to model processes, concepts and arguments in natural selection and evolutionary biology, using either Mendelian asexual or sexual reproduction, or counterfactual systems such as \u27paint pot\u27 or blending inheritance. In this environment students can explore a conceptual What if? in evolutionary biology, test misconceptions and deepen understanding of inheritance and changes in populations. Populations can be defined either with typological, or with populational thinking, to inquire into the role and necessity of variation in natural selection. The approach is generative not tutorial. The interface is highly graphic with twenty traits set as icons that are moved onto the \u27phenotypes\u27. Activities include investigations of evolutionary theory of aging, reproductive advantage, sexual selection and mimicry. Design of the activities incorporates Howard Gardner\u27s Theory of Multiple Intelligences. Draft of a teacher and student manual are included

The Thought of Philip Doddridge in the Context of Early Eighteenth-Century Dissent

Philip Doddridge (1702-51) was pastor of the Independent congregation meeting at Castle Hill, Northampton, and tutor of the Northampton academy from 1729 to his death in 1751. He is regarded as a leader of moderate Dissent during that period and the heir, theologically and pastorally, of Richard Baxter. He has been seen as forming a bridge between the more rational Dissenters, on the one hand, and the more conservative and orthodox wing of Dissent on the other. His thought has not, however, been the subject of a detailed analysis in the context of his time. This thesis sets out to conduct such an analysis in order to examine more closely his position within early eighteenth-century Dissent. Doddridge’s philosophical and theological views are considered in chapters two to five. Chapter two assesses the extent of his indebtedness to the philosophy of John Locke, examining also the views of Isaac Watts and showing how Doddridge and Watts modified Locke’s thought in some areas in order to accommodate Christian beliefs. In chapter three, Doddridge’s views on natural theology, natural law and reason are considered and the influence on him of Samuel Clarke, in particular, is examined. Turning to theology, chapter four looks at the use in early eighteenth-century Dissent of terms such as ‘Baxterian’ and ‘moderate Calvinist’ and then considers Doddridge’s doctrinal positions on a range of subjects which are generally considered to represent Baxterian theology. Chapter five examines Doddridge’s views on the key interconnected areas of confessional subscription, scripture and the doctrine of the Trinity. Practical subjects are then considered in chapters six to eight. Doddridge’s views on Christian piety are examined in chapter six. Chapter seven considers ways in which Doddridge sought to communicate, examining the audiences whom he aimed to reach, the ways in which he attempted to reach them and the content of what he wanted to say. The eighth chapter looks at the subject of identity and argues that Doddridge is to be viewed, not so much as a bridge between different wings of Dissent, but as a leader amongst moderate Calvinists. In conclusion, this thesis argues that Philip Doddridge sought to expound a Calvinist theology in the context of the philosophical and theological debates of his day and to promote an ordered Dissent focused on central evangelical truths and united around the language of scripture