Academic literature on the topic 'Synthetic Geometries'
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Journal articles on the topic "Synthetic Geometries":
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Hazzard, Kaden R. A., and Bryce Gadway. "Synthetic dimensions." Physics Today 76, no. 4 (April 1, 2023): 62–63. http://dx.doi.org/10.1063/pt.3.5225.
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Day, Jeffrey L., and Brian T. Rex. "Everyday Geometries: Synthetic Facts and Superficial Qualities." Journal of Architectural Education 57, no. 2 (November 2003): 29–35. http://dx.doi.org/10.1162/104648803770558969.
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Reigh, Shang Yik, and Raymond Kapral. "Catalytic dimer nanomotors: continuum theory and microscopic dynamics." Soft Matter 11, no. 16 (2015): 3149–58. http://dx.doi.org/10.1039/c4sm02857k.
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Marston, Timothy, and Jermaine L. Kennedy. "Scan geometries for three dimensional synthetic aperture sonar tomography." Journal of the Acoustical Society of America 140, no. 4 (October 2016): 3347. http://dx.doi.org/10.1121/1.4970696.
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Sarkar, Kanad, Manan Mittal, Ryan M. Corey, and Andrew C. Singer. "Manifold learning for dynamic array geometries." Journal of the Acoustical Society of America 152, no. 4 (October 2022): A143. http://dx.doi.org/10.1121/10.0015835.
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Large-scale distributed arrays can obtain high spatial resolution, but they typically rely on a rigid array structure. If we want to form distributed arrays from mobile and wearable devices, our models need to account for motion. The motion of multiple microphones worn by humans can be difficult to track, but through manifold techniques we can learn the movement through its acoustic response. We show that the mapping between the array geometry and its acoustic response is locally linear and can be exploited in a semi-supervised manner for a given acoustic environment. We will also investigate generative modelling of microphone positions based on their acoustic response to both synthetic and recorded data. Prior work has shown a similar locally linear mapping between source locations and their spatial cues, and we will attempt to combine these findings with our own to develop a localization model suitable for dynamic array geometries.
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Smponias, Theodoros. "Synthetic Neutrino Imaging of a Microquasar." Galaxies 9, no. 4 (October 19, 2021): 80. http://dx.doi.org/10.3390/galaxies9040080.
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Microquasar binary stellar systems emit electromagnetic radiation and high-energy particles over a broad energy spectrum. However, they are so far away that it is hard to observe their details. A simulation offers the link between relatively scarce observational data and the rich theoretical background. In this work, high-energy particle emission from simulated twin microquasar jets is calculated in a unified manner. From the cascade of emission within an element of jet matter to the dynamic and radiative whole jet model, the series of physical processes involved are integrated together. A programme suite assembled around model data produces synthetic images and spectra directly comparable to potential observations by contemporary arrays. The model is capable of describing a multitude of system geometries, incorporating increasing levels of realism depending on need and available computational resources. As an application, the modelling process is applied to a typical microquasar, which is synthetically observed from different angles using various imaging geometries. Furthermore, the resulting intensities are comparable to the sensitivity of existing detectors. The combined background emission from a potential distribution of microquasars is also modelled.
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Choudhary, Adnan, Christopher Maffeo, and Aleksei Aksimentiev. "Multi-resolution simulation of DNA transport through large synthetic nanostructures." Physical Chemistry Chemical Physics 24, no. 5 (2022): 2706–16. http://dx.doi.org/10.1039/d1cp04589j.
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Eto, Hiromune, Henri G. Franquelim, Michael Heymann, and Petra Schwille. "Membrane-coated 3D architectures for bottom-up synthetic biology." Soft Matter 17, no. 22 (2021): 5456–66. http://dx.doi.org/10.1039/d1sm00112d.
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This paper outlines a robust method to template biological membranes in 3D geometries using micron-scale 3D printing. Dynamic protein systems were reconstituted in vitro and their self-organization was observed in response to the 3D geometry.
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Deka, Siddhartha Sankar, Rituraj Gautam, Anoop Singh, Gautam Kumar, and Promod Kumar Patowari. "A Study on Synthetic Jet Actuator Diaphragm." Journal of Advanced Manufacturing Systems 14, no. 02 (April 27, 2015): 91–105. http://dx.doi.org/10.1142/s0219686715500079.
Abstract:
A synthetic jet actuator (SJA) is one of the most widely used active flow control device which uses a vibrating diaphragm enclosed within a cavity to generate the fluid jet. The effectiveness of the actuator greatly depends upon the design of cavity and orifice and the diaphragm properties. A lot of emphasis is being laid on the cavity and orifice design, but very few literatures can be found dealing with the diaphragm of the SJA. Thus, in this paper a study of the SJA diaphragm actuated by piezoelectric ceramics of different geometries is being presented. Three different diaphragm materials — brass, poly-silicon and aluminum and five different geometries of the piezoelectric actuators — annular disc shaped actuator patch, annular shaped actuator, rectangular shaped actuator patch and circular disc shaped actuator patch and two cantilever arrangements are being considered. A static analysis is carried out and a comparison of the parameters which affect the performance of the SJA is done. Frequency response analysis is also carried out to obtain a better understanding of the diaphragm's structural characteristics. The results thus obtained show that an annular disc piezoelectric patch configuration shows the best behavior as compared to the other actuator configurations and is closely followed by circular disc piezoelectric patch configuration.
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Gutowski, P. R., and S. Treitel. "The generalized one‐dimensional synthetic seismogram." GEOPHYSICS 52, no. 5 (May 1987): 589–605. http://dx.doi.org/10.1190/1.1442329.
Abstract:
The normal‐incidence synthetic seismogram for an elastic and horizontally stratified medium has been thoroughly studied for a relatively restricted number of source and receiver locations. Most existing treatments are concerned with the special case in which the source as well as the receiver are situated at the surface; few attempts have dealt with completely arbitrary source and receiver geometries. Here we examine arbitrary geometries with the aid of the layer matrix approach, in which upgoing and downgoing wave motion at each interface is expressed in terms of z-transform polynomials. Such an approach brings to light a number of physically important relations that the model satisfies. For example, the synthetic seismograms generally have the familiar autoregressive‐moving average (ARMA) structure for the surface‐source, surface‐receiver case. For particular combinations of reflection coefficients, however, the seismograms reduce to purely autoregressive (AR) representations. In all cases, we work out the delay properties that the respective autoregressive and moving average components must obey. The present solutions are easily reduced to a useful form for practical computation. One application of particular current interest is the simulation of vertical seismic profiling (VSP) surveys, where we have extended the theoretical treatment to include expressions for the derivatives of the seismograms with respect to the reflection coefficients. The resulting time series, which we call Jacobograms, are indicative of the sensitivity of the seismogram to the various reflection coefficients and are thus diagnostic of the model’s behavior.
Dissertations / Theses on the topic "Synthetic Geometries":
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Sciannandrone, Daniele. "Acceleration and higher order schemes of a characteristic solver for the solution of the neutron transport equation in 3D axial geometries." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112171/document.
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Le sujet de ce travail de thèse est l’application de la méthode de caractéristiques longues (MOC) pour résoudre l’équation du transport des neutrons pour des géométries à trois dimensions extrudées. Les avantages du MOC sont sa précision et son adaptabilité, le point faible était la quantité de ressources de calcul requises. Ce problème est même plus important pour des géométries à trois dimensions ou le nombre d’inconnues du problème est de l’ordre de la centaine de millions pour des calculs d’assemblage.La première partie de la recherche a été dédiée au développement des techniques optimisées pour le traçage et la reconstruction à-la-volé des trajectoires. Ces méthodes profitent des régularités des géométries extrudées et ont permis une forte réduction de l’empreinte mémoire et une réduction des temps de calcul. La convergence du schéma itératif a été accélérée par un opérateur de transport dégradé (DPN) qui est utilisé pour initialiser les inconnues de l’algorithme itératif and pour la solution du problème synthétique au cours des itérations MOC. Les algorithmes pour la construction et la solution des opérateurs MOC et DPN ont été accélérés en utilisant des méthodes de parallélisation à mémoire partagée qui sont le plus adaptés pour des machines de bureau et pour des clusters de calcul. Une partie importante de cette recherche a été dédiée à l’implémentation des méthodes d’équilibrage la charge pour améliorer l’efficacité du parallélisme. La convergence des formules de quadrature pour des cas 3D extrudé a aussi été explorée. Certaines formules profitent de couts négligeables du traitement des directions azimutales et de la direction verticale pour accélérer l’algorithme. La validation de l’algorithme du MOC a été faite par des comparaisons avec une solution de référence calculée par un solveur Monte Carlo avec traitement continu de l’énergie. Pour cette comparaison on propose un couplage entre le MOC et la méthode des Sous-Groupes pour prendre en compte les effets des résonances des sections efficaces. Le calcul complet d’un assemblage de réacteur rapide avec interface fertile/fissile nécessite 2 heures d’exécution avec des erreurs de quelque pcm par rapport à la solution de référence.On propose aussi une approximation d’ordre supérieur du MOC basée sur une expansion axiale polynomiale du flux dans chaque maille. Cette méthode permet une réduction du nombre de mailles (et d’inconnues) tout en gardant la même précision.Toutes les méthodes développées dans ce travail de thèse ont été implémentées dans la version APOLLO3 du solveur de transport TDTThe topic of our research is the application of the Method of Long Characteristics (MOC) to solve the Neutron Transport Equation in three-dimensional axial geometries. The strength of the MOC is in its precision and versatility. As a drawback, it requires a large amount of computational resources. This problem is even more severe in three-dimensional geometries, for which unknowns reach the order of tens of billions for assembly-level calculations.The first part of the research has dealt with the development of optimized tracking and reconstruction techniques which take advantage of the regularities of three-dimensional axial geometries. These methods have allowed a strong reduction of the memory requirements and a reduction of the execution time of the MOC calculation.The convergence of the iterative scheme has been accelerated with a lower-order transport operator (DPN) which is used for the initialization of the solution and for solving the synthetic problem during MOC iterations.The algorithms for the construction and solution of the MOC and DPN operators have been accelerated by using shared-memory parallel paradigms which are more suitable for standard desktop working stations. An important part of this research has been devoted to the implementation of scheduling techniques to improve the parallel efficiency.The convergence of the angular quadrature formula for three-dimensional cases is also studied. Some of these formulas take advantage of the reduced computational costs of the treatment of planar directions and the vertical direction to speed up the algorithm.The verification of the MOC solver has been done by comparing results with continuous-in-energy Monte Carlo calculations. For this purpose a coupling of the 3D MOC solver with the Subgroup method is proposed to take into account the effects of cross sections resonances. The full calculation of a FBR assembly requires about 2 hours of execution time with differences of few PCM with respect to the reference results.We also propose a higher order scheme of the MOC solver based on an axial polynomial expansion of the unknown within each mesh. This method allows the reduction of the meshes (and unknowns) by keeping the same precision.All the methods developed in this thesis have been implemented in the APOLLO3 version of the neutron transport solver TDT
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Saccaro, Ludovica. "Vers l'évaluation du risque des anévrismes de l'aorte abdominale par modélisation géométrique et simulations hémodynamiques d'ordre réduit." Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0025.
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Cette thèse se concentre sur une pathologie spécifique affectant la section abdominale de l'aorte, connue sous le nom d'anévrisme de l'aorte abdominale (AAA). Un anévrisme implique un affaiblissement persistant et localisé de la paroi du vaisseau, entraînant des élargissements et des renflements, provoquant une recirculation et une turbulence du flux sanguin.Notre thèse expose une méthodologie pour la modélisation géométrique des anévrismes abdominaux. Le processus comprend l'acquisition d'images de scanners CT, la reconstruction de la géométrie 3D de l'aorte et l'isolation de l'anévrisme. La phase de modélisation commence par l'identification et l'approximation de la ligne médiane du vaisseau aortique à l'aide de fonctions B-spline. La paroi aortique est ensuite partitionnée et profilée à l'aide de séries de Fourier.Pour évaluer son efficacité, la technique développée est appliquée à un ensemble de données de scanners CT de patients. Les reconstructions obtenues à partir des scans sont également présentées comme des exemples détaillant chaque étape de la procédure. De plus, une évaluation quantitative et la logique derrière les paramètres de modélisation sont expliquées. Ensuite, en tant que première application, la modélisation est intégrée à un processus de registration pour le diagnostic clinique et le suivi.La procédure de modélisation géométrique développée est utilisée dans un pipeline pour des simulations hémodynamiques et une évaluation des risques, en utilisant une approche de modélisation d'ordre réduit pour construire un espace de solution. Des simulations, utilisant des géométries paramétrées, sont réalisées dans des conditions réalistes, et des indicateurs de risque sont calculés et liés à la représentation géométrique à l'aide d'une fonction interpolante à base radiale. Enfin, des prédictions sur les indicateurs de risque sont obtenues pour une géométrie inconnue. Les résultats, bien que prometteurs, pourront être améliorés en augmentant de manière appropriée l'ensemble de données initial.Pour remédier à la pénurie mentionnée de données cliniques, nous avons élaboré un flux de travail automatisé pour générer des géométries synthétiques. Cette approche permet l'identification de paramètres géométriques pertinents et implique l'apprentissage automatique pour générer une population virtuelle de patients cohérente avec les données d'origine. En plus d'améliorer la capacité prédictive des modèles réduits, la méthode peut également être appliquée de manière prospective pour des essais in silico et des études impliquant des populations virtuelles de patientsThis thesis focuses on a specific pathology affecting the abdominal section of the aorta, known as abdominal aortic aneurysm (AAA). An aneurysm involves a persistent and localized weakening of the vessel wall, leading to enlargements and bulges, causing recirculation and turbulence of blood flow.Our thesis outlines a methodology for geometric modeling of abdominal aneurysms. The process involves acquiring CT images, reconstructing the aorta 3D geometry, and isolating the aneurysm. The modeling phase begins by identifying and approximating the centerline of the aortic vessel using B-spline functions. The aortic wall is then partitioned and profiled using Fourier series.To evaluate its effectiveness, the developed technique is applied to a dataset of CT scans from patients. Reconstructions obtained from the scans are also presented as examples to detail each step of the procedure. In addition, a quantitative evaluation and rationale behind modeling parameters are explained. Then, as a first application, the modeling is integrated into a registration process for clinical diagnosis and follow-up.The geometrical modeling procedure developed is used in a pipeline for hemodynamic simulations and risk assessment, employing a reduced-order modeling approach to construct a reduced solution space. Simulations, utilizing parameterized geometries, are conducted under realistic conditions, and risk indicators are computed and linked to the geometrical representation using Radial Basis Functions interpolant. Finally, predictions on risk indicators are obtained for an unknown geometry. The results, despite being promising, can be further improved by appropriately augmenting the initial dataset.To address the aforementioned scarcity of clinical data, we devised an automated workflow for generating synthetic geometries. This approach allows for the identification of relevant geometry parameters and involves machine learning to generate a virtual patient population consistent with the original data. In addition to improving the predictive capability of reduced models, the method can also be applied prospectively for in-silico trials and studies involving virtual patient populations
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Isgro, Francesco. "Geometric methods for video sequence analysis and applications." Thesis, Heriot-Watt University, 2001. http://hdl.handle.net/10399/495.
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Coulter, Stewart. "Representation of geometric constraints in parametric synthesis." Thesis, Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/17982.
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Bresolin, Nadia Roberta Quaini. "GEOMETRIA SINTÉTICA: INVESTIGAÇÃO SOBRE O USO DE UM SOFTWARE DE GEOMETRIA DINÂMICA COMO MEIO PARA DEMONSTRAÇÕES VISUAIS." Centro Universitário Franciscano, 2016. http://www.tede.universidadefranciscana.edu.br:8080/handle/UFN-BDTD/594.
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This research aimed to investigate how the GeoGebra software can provide the development of creative, intuitive and visual abilities in the statement of theorems of synthetic geometry. The research was carried out with five students of the first year of high school in a state school of Rio Grande do Sul. This is a qualitative research carried out in the computer lab; data collection was obtained through the records of the constructions carried out by students and analyzed existing protocols in the software itself. The investigative activities, developed in workshop mode, consisted of four specific theorems of plane geometry, chosen at random and feasible to be offered to students of elementary school. The research results showed that the activities provided through the GeoGebra software, the development of creativity, the use of intuitive thinking and visualization as a way of analyzing the operation of ideas in the formulation of conjectures, which contributed to the construction of theorems, providing meaningful learning. Also, it indicates synthetic geometry as a way to perform logical statements of theorems, developing reasoning skills and justifications. In turn, the results showed that the use of GeoGebra software, used in construction, was key to achieving the goals in the research.
Este trabalho de pesquisa teve como objetivo investigar de que forma o software GeoGebra pode proporcionar o desenvolvimento de habilidades criativas, intuitivas e visuais na demonstração de teoremas de Geometria Sintética. A investigação foi realizada com cinco alunas do primeiro ano do Ensino Médio de uma Escola Estadual do Rio Grande do Sul. Trata-se de uma pesquisa de cunho qualitativo realizada em laboratório de informática; a coleta de dados foi obtida pelos registros das construções realizadas pelas estudantes e analisados os protocolos existentes no próprio software. As atividades investigativas, desenvolvidas na modalidade de oficina, consistiram de quatro teoremas específicos de Geometria Plana, escolhidos aleatoriamente e viáveis de serem propostos aos estudantes da escola básica. Os resultados da investigação demonstraram que as atividades propostas oportunizaram, por meio do software GeoGebra, o desenvolvimento da criatividade, o uso do pensamento intuitivo e a visualização como forma de analisar a exploração de ideias na formulação de conjecturas, o que contribuiu para a construção dos teoremas, propiciando uma aprendizagem significativa. Além disso, indica Geometria Sintética como uma forma de realizar demonstrações lógicas de teoremas, desenvolvendo habilidades de argumentação e justificativas. Por sua vez, os resultados mostraram que o uso do software GeoGebra, utilizado nas construções, foi fundamental para atingir os objetivos propostos na pesquisa.
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Duersch, Michael Israel. "Backprojection for Synthetic Aperture Radar." BYU ScholarsArchive, 2013. https://scholarsarchive.byu.edu/etd/4060.
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Synthetic aperture radar (SAR) is a type of radar capable of high-resolution coherent imaging. In order to produce coherent imagery from raw SAR data, an image formation algorithm is employed. The various image formation algorithms have strengths and weaknesses. As this work shows, time-domain backprojection is one algorithm whose strengths are particularly well-suited to use at low-altitudes. This work presents novel research in three areas regarding time-domain backprojection. The first key contribution of this work is a detailed analysis of SAR time-domain backprojection. The work derives a general form of backprojection from first principles. It characterizes the sensitivities of backprojection to the various inputs as well as error sources and performance characteristics. This work then shows what situations are particularly well-suited to use of the backprojection algorithm, namely regimes with turbulent motion and wide variation in incidence angle across the range swath (e.g., low-altitude, airborne SAR).The second contribution of this work is an analysis of geometric signal correlation for multi-static, sometimes termed multiple-input and multiple-output (MIMO), imaging. Multi-static imaging involves forming multiple images using different combinations of transmitters and receivers. Geometric correlation is a measure of how alike observations of a target are from different aspect angles. This work provides a novel model for geometric correlation which may be used to determine the degree to which multi-static images are correlated. This in turn determines their applicable use: operating in the highly correlated regime is desirable for coherent processing whereas operating in a lower-correlation regime is desirable for obtaining independent looks. The final contribution of this work is a novel algorithm for interferometry based on backprojected data. Because of the way backprojected images are formed, they are less suited to traditional interferometric methods. This work derives backprojection interferometry and compares it to the traditional method of interferometry. The sensitivity and performance of backprojection interferometry are shown, as well as where backprojection interferometry offers superior results. This work finds that backprojection interferometry performs better with longer interferometric baseline lengths or systems with large measurement error in the baseline length or angle (e.g., low-altitude, airborne SAR).
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Morelli, Alessandra. "Synthesis of metal based interlocked architectures : spanning through oxidation states, geometries and coordination motifs." Thesis, University of Edinburgh, 2004. http://hdl.handle.net/1842/12685.
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Efficient synthetic methods have been developed for catenates and rotaxanes based on tetrahedral and trigonal bipyrimidal metal complexes using the metal-bis-phenanthroline synthon pioneered in Strasbourg. The aim of this project was to investigate the possibility to synthesise mechanically interlocked architecture using metals with higher oxidation states, different geometries and higher coordination motifs. Chapter Two describes the synthesis of a general ligand system for rotaxane complexes of ions that prefer octahedral coordination – the commonest ligand geometry amongst transition metals but up to now a rare coordination mode for rotaxanes. Simple mixing of the components at room temperature is sufficient to assemble a broad range of octahedrally coordinated metal-[2]rotaxanes in excellent yields. The reactions have few, if any, by products and proceed under thermodynamic control in the absence of a catalyst or any other external reagents. Chapter Three reports the template-directed synthesis of a [2]catenate and a [2]rotaxane by a clipping approach around trivalent octahedral cobalt ions. Chapter Four reports the design and investigation of the synthesis of pentacoordinate rotaxane about divalent zinc and cadmium metals and of tetracoordinate rotaxane about divalent palladium. A clipping approach as well as a threading-and-capping approach were considered for both geometries, leading to interesting results involving the kinetics and thermodynamics of each complex. Zinc was suitable for the self-assembling of the macrocycle about the metal-thread complex but failed to hold the unstoppered thread in place to undergo capping reaction; cadmium on the contrary yielded rotaxane upon threading approach but lead to the formation of more thermodynamically stable hexacoordinate catenate upon ligand self-assembly via clipping approach. Palladium did not promote any self-organization towards the assembly of the macrocycle via clipping approach about the preformed thread.
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Ciobotarescu, Simona. "Synthesis, molecular modeling and photochromic behaviour of polysiloxanes containing azo-groups with different geometries." Thesis, Angers, 2020. http://bu.univ-angers.fr/Contact.
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La présente thèse représente une étude complexe des azopolysiloxanes photosensibles et rejoint les techniques théoriques et expérimentales. Le thème tourne autour du phénomène de transport de masse des azopolymères induit par la photoisomérisation des azobenzènes. La conversion transt – cis de l'azobenzène et de ses dérivés est un processus réversible actionné par la lumière, qui permet le réarrangement de la matière environnante au niveau nano et micro. Cette propriété est exploitée pour fabriquer des réseaux de relief de surface (SRG) avec caractéristiques géométriques specifiques. Les présentes études visent à comprendre ce mécanisme complexe, sujet à une grande controverse parmi les différents groupes de recherche. Les paramètres qui contrôlent le processus sont traités et analysés. L'étude expérimentale comprend la synthèse et la caractérisation de quatre azopolysiloxanes qui sont ensuite analysés pour leur capacité d'obtenir des SRG. Le comportement photochromique est évalué par des expériments d'irradiation à différentes intensités lumineuses, en présence ou l'absence d'une lumière d'assistance qui devrait intensifier l'isomérisation. La simulation informatique se concentre sur la diffusion des molécules dans le système: une molécule de type azobenzène (moteur moléculaire) diluée dans le milieu hôte. Des calculs de modélisation moléculaire sont effectués pour des moteurs de différentes longueurs et avec différents temps d'isomérisation (isomérisation rapide ou lente) afin de définir la relation entre ces paramètres et la diffusion. Fournir des informations expérimentales et théoriques sur les azopolymères, est trop important pour comprendre la formation de SRGThe herein thesis represents a complex study of photosensitive azopolysiloxanes and rejoins both theoretical and experimental techniques. The theme revolves around the azopolymer’s mass transport phenomenon induced by the photoisomerization of azobenzenes. Trans- to cis conversion of azobenzene and its derivatives is a reversible light actuated process that enables the rearrangement of surrounding matter at nano and micro level. This property is exploited to fabricate surface relief gratings (SRG) with certain geometrical features. The present studies are directed to comprehension of this complex mechanism, subject to great controversial among different research groups. The parameters that control the process are addressed and analyzed. Experimental study comprises the synthesis and characterization of four azopolysiloxanes which are then analyzed for the capacity to obtain SRG. Photochromic behaviour is evaluated through irradiation experiments at different light intensity, in the presence or absence of an assistance light that supposedly intensifies isomerization. Computer simulation focuses on diffusion of the molecules in the system: one azobenzene – like molecule (molecular motor) diluted in the host medium. Molecular modeling calculations are performed for motors with different lengths and with various isomerization times (fast or slow isomerization) in order to define the relation between these parameters and diffusion. Providing experimental and theoretical info on azopolymers is part of the SRG formation insight
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Oliveira, Júnior José William de. "Três pontos de vista sobre cônicas." Mestrado Profissional em Matemática, 2018. http://ri.ufs.br/jspui/handle/riufs/9321.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPESIn the present work, we tried to investigate the conics in the synthetic, analytical and projective contexts, as well as to know some applications and properties of these curves. In the synthetic approach, it was emphasized a lithe of the historical aspects, the works made by Apollonius and Dandelin, a characterization for tangent and normal lines and re ecting properties. In the analytical approach, the Cartesian, polar and parametric equations were described, as well as the applications in the Kepler Laws. In the projective approach, the concepts of projective plane, projective point, projective line and projective applications were used to give meaning to the conic in the projective universe, in addition the Theorews of Pascal and Brianchon were demonstrated.
No presente trabalho, procurou-se investigar as cônicas nos contextos sintético, analítico e projetivo, bem como conhecer algumas aplicações e propriedades dessas curvas. Na abordagem sintética, foram enfatizados um pouco do aspecto histórico, os trabalhos feitos por Apolônio e Dandelin, uma caracterização para retas tangentes e normais e as propriedades refletoras. Na abordagem analítica, foram descritas as equações cartesianas, polares e paramétricas, como também as aplicações nas Leis de Kepler. Na abordagem projetiva, foram trabalhados os conceitos de plano projetivo, ponto projetivo, reta projetiva e aplicações projetivas para dar significado as cônicas no universo projetivo, além disso foram demonstrados os teoremas de Pascal e Brianchon.
São Cristóvão, SE
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Mukesh, Jain Prakhyaa. "A Synthesis of Geometry and Light." Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/101967.
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The poetics of an architecture of a moment is explored through design of a contemplative room (wherin the geometric transformation of a cubic base to a cone) demonstrates the rhythmn and proportion of the construction of the room and the relative motion of the sun in the space. The relationship of the sun rays on the walls of the room passing through a reflecting pool are shown using demonstrative and constructive means of descriptive geometry as both the design generator and poetic expression.The composition of the buildings reveals the play of light on form.Master of Architecture
An exploration to understand the relationship of architecture and the material sensible world. The work seeks to reveal that through the tangible architectural strategies of form, structure, material and light, the intangible qualities of architecture are defined.
Books on the topic "Synthetic Geometries":
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Mizrahi, Abe. Mizrahi: Synthetic Peptides in Biotechnology. John Wiley & Sons Inc, 1988.
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Garrett, Aaron. The Virtues of Geometry. Edited by Michael Della Rocca. Oxford University Press, 2015. http://dx.doi.org/10.1093/oxfordhb/9780195335828.013.22.
Abstract:
Spinoza consistently used geometrical demonstrations to present his philosophical ideas. This is evident in the Ethics, Short Treatise, and Descartes’ Principles of Philosophy Demonstrated in the Geometric Manner. In Tractatus de Intellectu Emendatione, Spinoza talks about “a way of healing the intellect, and purifying it” that might precede geometrical demonstration but gives no definition of the intellect or any general procedure for acquiring true definitions. This chapter examines how one acquires these definitions, discussing first what Spinoza might have considered to be the advantages or virtues of geometrical demonstration: transparency, force, security, scale, compactness, flexibility, generality, and sense-independence. It then analyzes Spinoza’s relation to Descartes, highlighting the distinction between the analytic and the synthetic method, their different sense of geometrical order, and another virtue of geometry: ease. Finally, it invokes the idea of method Spinoza outlined in Emendatione as a solution to the puzzle mentioned earlier.
Book chapters on the topic "Synthetic Geometries":
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Holst, Dirk, Daniel Schoepflin, and Thorsten Schüppstuhl. "Generation of Synthetic AI Training Data for Robotic Grasp-Candidate Identification and Evaluation in Intralogistics Bin-Picking Scenarios." In Lecture Notes in Mechanical Engineering, 284–92. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-18326-3_28.
Abstract:
AbstractRobotic bin picking remains a main challenge for the wide enablement of industrial robotic tasks. While AI-enabled picking approaches are encouraging they repeatedly face the problem of data availability. The scope of this paper is to present a method that combines analytical grasp research with the field of synthetic data creation to generate individual training data for use-cases in intralogistics transportation scenarios. Special attention is given to systematic grasp finding for new objects and unknown geometries in transportation bins and to match the generated data to a real two-finger parallel gripper. The presented approach includes a grasping simulation in Pybullet to investigate the general tangibility of objects under uncertainty and combines these findings with a previously reported virtual scene generator in Blender, which generates AI-images of fully packed transport boxes, including depth maps and necessary annotations. This paper, therefore, contributes a synthesizing and cross-topic approach that combines different facets of bin-picking research such as geometric analysis, determination of tangibility of objects, grasping under uncertainty, finding grasps in dynamic and restricted bin-environments, and automation of synthetic data generation. The approach is utilized to generate synthetic grasp training data and to train a grasp-generating convolutional neural network (GG-CNN) and demonstrated on real-world objects.
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Bokowski, Jürgen, and Bernd Sturmfels. "Geometric methods." In Computational Synthetic Geometry, 87–101. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/bfb0089258.
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Bokowski, Jürgen, and Bernd Sturmfels. "Algebraic criteria for geometric realizability." In Computational Synthetic Geometry, 61–86. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/bfb0089257.
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Abu Alhaija, Hassan, Siva Karthik Mustikovela, Andreas Geiger, and Carsten Rother. "Geometric Image Synthesis." In Computer Vision – ACCV 2018, 85–100. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-20876-9_6.
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Theobald, Barry, J. Andrew Bangham, Silko Kruse, Gavin Cawley, and Iain Matthews. "Towards Videorealistic Synthetic Visual Speech." In Uncertainty in Geometric Computations, 175–84. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/978-1-4615-0813-7_15.
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Hoffman, William C. "Figural Synthesis by Vectorfields: Geometric Neuropsychology." In Figural Synthesis, 249–82. London: Routledge, 2021. http://dx.doi.org/10.4324/9781003150428-8.
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Hamilton, Sarah C., and Mireille E. Broucke. "Control Synthesis." In Geometric Control of Patterned Linear Systems, 85–109. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-28804-3_5.
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Busemann, H. "The Synthetic Approach to Finsler Spaces in the Large." In Geometria del calcolo delle variazioni, 1–72. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-10959-1_1.
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Vignat, Frédéric, and François Villeneuve. "3D Analysis and Synthesis of Manufacturing Tolerances." In Geometric Tolerancing of Products, 305–39. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118587027.ch12.
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Giordano, Max, Eric Pairel, and Serge Samper. "Tolerance Analysis and Synthesis, Method of Domains." In Geometric Tolerancing of Products, 151–81. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118587027.ch7.
Conference papers on the topic "Synthetic Geometries":
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Pierce, Carl J., Alfonso Benavides, Mark E. Everett, and Jack Stalnaker. "UXO detection improvements using EM63 synthetic multi‐receiver array geometries." In SEG Technical Program Expanded Abstracts 2003. Society of Exploration Geophysicists, 2003. http://dx.doi.org/10.1190/1.1817503.
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Moldoveanu, Nick, Shuki Ronen, and Scott Michell. "Footprint analysis of land and TZ acquisition geometries using synthetic data." In SEG Technical Program Expanded Abstracts 1999. Society of Exploration Geophysicists, 1999. http://dx.doi.org/10.1190/1.1821104.
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Balkaya, Ufuk, and Ozan Karaman. "Fabrication and Characterization of Silicate Additive Synthetic Bone Grafts in Defined Geometries." In 2019 Medical Technologies Congress (TIPTEKNO). IEEE, 2019. http://dx.doi.org/10.1109/tiptekno.2019.8895179.
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E. Jones, C., J. A. Edgar, J. I. Selvage, and H. Crook. "Building Complex Synthetic Models to Evaluate Acquisition Geometries and Velocity Inversion Technologies." In 74th EAGE Conference and Exhibition incorporating EUROPEC 2012. Netherlands: EAGE Publications BV, 2012. http://dx.doi.org/10.3997/2214-4609.20148575.
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Aslan, A. Rustem, Oktay Baysal, and Firat O. Edis. "Computing Micro Synthetic Jet in Slip Regime With Moving Membrane." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-33770.
Abstract:
A Navier-Stokes (NS) solver for moving and deforming meshes has been modified to investigate numerically the diaphragm-driven flow in and out of two synthetic jet cavity geometries. The piezoelectric-driven diaphragm of the cavity is modeled in a realistic manner as a moving boundary to accurately compute the flow inside the jet cavity. The primary focus of the present paper is to describe the effect of cavity geometry and the wall slip, resulting from the relatively larger Kn number flows associated with micro sized geometries, on the exit jet velocity magnitude. Compressible flow simulations are required for rarefied flows to accurately predict the pressure field. The present computations for the quiescent external flow condition reveal that cavity geometry and the wall slip has an increasing effect on the magnitude of the average jet exit velocity as well as vortex shedding from the orifice.
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Fugal, Spencer R., Barton L. Smith, and Robert E. Spall. "A Numerical Study of 2-D Synthetic Jet Formation." In ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56854.
Abstract:
The formation of a two dimensional synthetic jet is studied numerically by solving the incompressible, unsteady, Reynolds-averaged, Navier-Stokes equations. Results for two exit geometries, a sharp exit and a rounded exit, and several dimensionless stroke lengths are compared. This study focuses on how the exit geometry and dimensionless stroke length change the following parameters: the power required to form the jet, the net momentum flux in the jet downstream of the exit, the formation threshold of the synthetic jet, and the location of the stagnation point during the suction portion of the cycle.
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Koklu, Mehti, Nurhak Erbas, and Oktay Baysal. "Effective Range of Micro and Synthetic Jets for Flow Control." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-81432.
Abstract:
Effectiveness of two-dimensional synthetic jet is studied using numerical simulations. A Navier-Stokes (NS) solver for moving and deforming meshes has been modified to investigate numerically the diaphragm-driven flow in and out of two synthetic jet cavity geometries. Compressible flow simulations are required for rarefied gas flows to accurately predict the micro flow field. The solver is modified to accommodate slip wall boundary condition proposed in literature for micro scale flow problems. The piezoelectric-driven diaphragm of the cavity is modeled in a realistic manner as a moving boundary to accurately compute the flow inside the jet cavity. The primary focus of the proposed paper will be on the analysis of the design space determined by the geometric and flow-type design variables that identify the effectiveness of the synthetic jet by means of the orifice jet velocity and local jet momentum rate. The design variables are the membrane oscillation frequency (f), membrane oscillation amplitude (A), orifice width (d), and membrane width (W). The present computations for jet discharging into quiescent medium reveal that these variables have determining effects on the flow control parameters, which are the jet exit velocity, local momentum rate, as well as vortex shedding from the orifice.
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Mahalingam, Raghav, and Ari Glezer. "Low-Profile Synthetic Jet Cooling for Portable Computers." In ASME 2003 International Electronic Packaging Technical Conference and Exhibition. ASMEDC, 2003. http://dx.doi.org/10.1115/ipack2003-35069.
Abstract:
This paper explores the novel technique of forced synthetic jet cooling within high-aspect ratio ducts that can be accommodated within low-profile electronic systems. A synthetic jet is an intense, small-scale turbulent jet that is synthesized directly from the fluid in the system in which it is embedded and is formed when fluid is alternately sucked and ejected from the cavity by the motion of a diaphragm bounding the cavity, so that there is no net mass addition to the system. This feature obviates the need for input piping or complex fluidic packaging and makes synthetic jets ideally suited for the low-profile geometries of portables. In the current work, a simple configuration of a 2-D synthetic jet ejector in a rectangular channel is used to ascertain the flow and thermal performance curves, overall thermal resistance and effectiveness for the synthetic jet ejector channel flow.
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Parker, M. C., F. Farjady, and S. D. Walker. "Quasi-Cycloidal Phase Profile Synthetic Aperture Technique for Passband-Broadened Arrayed-Waveguide Gratings." In The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1998. http://dx.doi.org/10.1364/cleo_europe.1998.cthh109.
Abstract:
Wavelength division multiplex (WDM) techniques are generally regarded as a key element in emerging broadband networks. Amongst the many passive device technologies being considered for wavelength selection, the arrayed-waveguide grating (AWG) [1] has multiplexing, demultiplexing and routing functionality. However, the non-rectangular passband characteristic of an AWG, due to die multiple convolution of input and output waveguide modes with the classical echelon transfer function of the waveguide array allows only a minimal wavelength-shift tolerance. In this paper we show how synthetic aperture techniques [2] can be employed to provide significant passband broadening and flattening. Figure 1 shows two possible geometries to achieve the desired phase control: either (I) profiling within the arrayed-waveguide, or (II) a geometric quasi-cycloidal deviation from the Rowland circle at the fan-out section.
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Rodrigues, F. F., J. C. Pascoa, and M. Trancossi. "Analysis of Innovative Plasma Actuator Geometries for Boundary Layer Control." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-66495.
Abstract:
Active flow control by plasma actuators is a topic of great interest by worldwide scientific community. These devices are mainly used for boundary layer control in order to improve the aerodynamic performance of aerial vehicles. Plasma actuators are simple devices that produces a wall bounded jet which allow to control the adjacent flow without moving mechanical parts. Recently, new geometries have been proposed by different authors in an attempt to improve the performance of these devices. In this work, some of these new configurations will be studied and compared considering its ability for boundary layer control applications. Dielectric Barrier Discharge (DBD) plasma actuator, Plasma Synthetic Jet (PSJ) actuator, Multiple Encapsulated Electrodes (MEE) plasma actuator and Curved plasma actuator (or 3D plasma actuator) will be experimentally studied in this work. Plasma actuators power consumption was measured by two different experimental methods. Results for power consumption and power losses of different plasma actuators geometries were presented and discussed.
Reports on the topic "Synthetic Geometries":
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Deschamps, Robert, and Henschel. PR-420-133721-R01 Comparison of Radar Satellite Methods for Observation of Stability. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), July 2015. http://dx.doi.org/10.55274/r0010840.
Abstract:
This report discusses the use of Synthetic Aperture Radar (SAR) satellites for monitoring above ground pipelines and buried pipeline Rights-Of-Way (ROWs) using Interferometric Synthetic Aperture Radar (InSAR) techniques. The main thrust of the research was to evaluate the suitability of above-ground pipeline support members as InSAR measurement points, and to adapt existing techniques to allow for precise monitoring of jacking and subsidence caused by permafrost degradation and dynamics. The study site at Prudhoe Bay, Alaska includes more than 60,000 horizontal pipeline supports. The known locations of supports were used to identify and isolate supports in the radar imagery, and the phase and intensity of supports were analyzed to determine their ability to provide reliable estimates of deformation. An additional component of this research was the comparison of two satellites operating at different frequencies, RADARSAT-2 operating at C-band and TerraSAR-X operating at X-band. One year of data was acquired with both sensors in similar acquisition geometries and resolutions, at 24-day intervals for RADARSAT-2 and 11-day intervals for TerraSAR-X. Recommendations are made on the choice of wavelength and concerning future work in this area. A list of technical requirements is also provided. The technologies for obtaining ground deformation estimates from natural targets, coherent targets and homogeneous and distributed targets are explained and supported by three operational case-studies in different environments. The work should provide above-ground pipeline operators working in permafrost areas with a clear view of the current state of research towards the operationalization of InSAR monitoring, but also of current operational capabilities in other pipeline applications, including ROW geohazard monitoring and monitoring of buried pipelines crossing Enhanced Oil Recovery (EOR) fields.
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Velten, Vincent J. Geometric Invariance for Synthetic Aperture Radar (SAR) Sensors. Fort Belvoir, VA: Defense Technical Information Center, April 2004. http://dx.doi.org/10.21236/ada426700.
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Kerber, Steve. Impact of Ventilation on Fire Behavior in Legacy and Contemporary Residential Construction. UL Firefighter Safety Research Institute, December 2014. http://dx.doi.org/10.54206/102376/gieq2593.
Abstract:
Under the United States Department of Homeland Security (DHS) Assistance to Firefighter Grant Program, Underwriters Laboratories examined fire service ventilation practices as well as the impact of changes in modern house geometries. There has been a steady change in the residential fire environment over the past several decades. These changes include larger homes, more open floor plans and volumes and increased synthetic fuel loads. This series of experiments examine this change in fire behavior and the impact on firefighter ventilation tactics. This fire research project developed the empirical data that is needed to quantify the fire behavior associated with these scenarios and result in immediately developing the necessary firefighting ventilation practices to reduce firefighter death and injury. Two houses were constructed in the large fire facility of Underwriters Laboratories in Northbrook, IL. The first of two houses constructed was a one-story, 1200 ft, 3 bedroom, bathroom house with 8 total rooms. The second house was a two-story 3200 ft, 4 bedroom, 2.5 bathroom house with 12 total rooms. The second house featured a modern open floor plan, two- story great room and open foyer. Fifteen experiments were conducted varying the ventilation locations and the number of ventilation openings. Ventilation scenarios included ventilating the front door only, opening the front door and a window near and remote from the seat of the fire, opening a window only and ventilating a higher opening in the two-story house. One scenario in each house was conducted in triplicate to examine repeatability. The results of these experiments provide knowledge for the fire service for them to examine their thought processes, standard operating procedures and training content. Several tactical considerations were developed utilizing the data from the experiments to provide specific examples of changes that can be adopted based on a departments current strategies and tactics.
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Kerber, Steve. Study of the Effectiveness of Fire Service Vertical Ventilation and Suppression Tactics in Single Family Homes. UL Firefighter Safety Research Institute, June 2013. http://dx.doi.org/10.54206/102376/iwzc6477.
Abstract:
Under the United States Department of Homeland Security (DHS) Assistance to Firefighter Grant Program, Underwriters Laboratories examined fire service ventilation and suppression practices as well as the impact of changes in modern house geometries. There has been a steady change in the residential fire environment over the past several decades. These changes include larger homes, more open floor plans and volumes, and increased synthetic fuel loads. This investigation examined the influence of these changes to the fire behavior and subsequent impact on firefighter tactics relative to horizontal and vertical ventilation and suppression. It is anticipated that the results of this investigation will be incorporated into improved firefighting tactics and decision making to reduce firefighter injuries and fatalities. Vertical ventilation has been used successfully but also resulted in firefighter fatalities in the past, as it is not easily coordinated with suppression and other fire ground tasks such as horizontal ventilation. It is not straightforward for firefighters to train on the effects of vertical ventilation since fire service training structures and props do not allow for ventilation-limited fire conditions with representative fuel loads and floor plans that will be encountered on the fire ground. Thus, guidance on the effectiveness of vertical ventilation comes from experience gained during real incidents, but under many different fire ground conditions. This has made it difficult to develop comprehensive guidance on the coordination of vertical ventilation with other firefighter tactics, and how these tactics may influence the fire dynamics in the burning home. The purpose of this study was to improve the understanding of the fire dynamics associated with the use of vertical ventilation so that it may be more effectively deployed on the fire ground. Two houses were constructed in the large fire facility of Underwriters Laboratories in Northbrook, IL. The first house was a one-story house (1200 ft, three bedrooms, one bathroom) with a total of 8 rooms. The second house was a two-story house (3200 ft, four bedrooms, two and a half bathrooms) with a total of 12 rooms. The second house featured a modern open floor plan, two-story great room and open foyer. A total of seventeen experiments were conducted varying the ventilation locations and the number of ventilation openings. Ventilation scenarios included ventilating the front door and a window near the seat of the fire (with modern and legacy furnishings) to link to the previous research on horizontal ventilation, opening the front door and ventilating over the fire and remote from the fire. Additional experiments examined controlling the front door, making different sized ventilation holes in the roof and the impact of exterior hose streams. The results from the experiments led to identification of tactical considerations for the fire service to integrate into their education and fire ground strategies and tactics where applicable.