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Cuando en un rectángulo convergen treinta autores seleccionados en una convocatoria abierta, doce textos invitados y más de cuarenta ilustraciones, obtienes esto: una seductora antología sobre la experiencia del aislamiento. Una vez que te asomes en ella te sorprenderá la variedad de sensaciones, hallazgos, temores y deseos que puede suscitar en cada ser humano el abrazo de las cuatro paredes, mientras el aire del contagio masivo sopla en la calle. Mírate en este espejo, amable lector: encontrarás en él no una sola imagen sino un mosaico de breves prosas poéticas, ensayos e incluso narraciones que trazan un paisaje literario multicolor. Descubre algo de ti en estas páginas y averigua a dónde llevan los portales que el distanciamiento social ha abierto en las pantallas de nuestra conciencia.
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Coloproctology is a surgical specialty which dynamically changes every few years. There is a profusion of colorectal textbooks but specialty series on particularly complex topics as well as on the specialized management approach for trainees and training colorectal surgeons are actually few. The aim of this text is a superior quality colorectal book written by world experts targeted at senior surgical and colorectal trainees and young consultant coloproctologists in current areas of subspecialty expertise. The structure of the chapters is current and is based on what does not appear and is not addressed in current colorectal textbooks. This series has proven useful in areas already represent...
Systems of polynomial equations can be used to model an astonishing variety of phenomena. This book explores the geometry and algebra of such systems and includes numerous applications. The book begins with elimination theory from Newton to the twenty-first century and then discusses the interaction between algebraic geometry and numerical computations, a subject now called numerical algebraic geometry. The final three chapters discuss applications to geometric modeling, rigidity theory, and chemical reaction networks in detail. Each chapter ends with a section written by a leading expert. Examples in the book include oil wells, HIV infection, phylogenetic models, four-bar mechanisms, border...
The Catholic University Of America Studies Mediaeval History, New Series, V11.
This Brief is mainly devoted to two classical and related results: the existence of a right inverse of the divergence operator and the so-called Korn Inequalities. It is well known that both results are fundamental tools in the analysis of some classic differential equations, particularly in those arising in fluid dynamics and elasticity. Several connections between these two topics and improved Poincaré inequalities are extensively treated. From simple key ideas the book is growing smoothly in complexity. Beginning with the study of these problems on star-shaped domains the arguments are extended first to John domains and then to Hölder α domains where the need of weighted spaces arises naturally. In this fashion, the authors succeed in presenting in an unified and concise way several classic and recent developments in the field. These features certainly makes this Brief useful for students, post-graduate students, and researchers as well.
Optimal design, optimal control, and parameter estimation of systems governed by partial differential equations (PDEs) give rise to a class of problems known as PDE-constrained optimization. The size and complexity of the discretized PDEs often pose significant challenges for contemporary optimization methods. With the maturing of technology for PDE simulation, interest has now increased in PDE-based optimization. The chapters in this volume collectively assess the state of the art in PDE-constrained optimization, identify challenges to optimization presented by modern highly parallel PDE simulation codes, and discuss promising algorithmic and software approaches for addressing them. These contributions represent current research of two strong scientific computing communities, in optimization and PDE simulation. This volume merges perspectives in these two different areas and identifies interesting open questions for further research.
Data assimilation is an approach that combines observations and model output, with the objective of improving the latter. This book places data assimilation into the broader context of inverse problems and the theory, methods, and algorithms that are used for their solution. It provides a framework for, and insight into, the inverse problem nature of data assimilation, emphasizing why and not just how. Methods and diagnostics are emphasized, enabling readers to readily apply them to their own field of study. Readers will find a comprehensive guide that is accessible to nonexperts; numerous examples and diverse applications from a broad range of domains, including geophysics and geophysical flows, environmental acoustics, medical imaging, mechanical and biomedical engineering, economics and finance, and traffic control and urban planning; and the latest methods for advanced data assimilation, combining variational and statistical approaches.
Most problems in science involve many scales in time and space. An example is turbulent ?ow where the important large scale quantities of lift and drag of a wing depend on the behavior of the small vortices in the boundarylayer. Another example is chemical reactions with concentrations of the species varying over seconds and hours while the time scale of the oscillations of the chemical bonds is of the order of femtoseconds. A third example from structural mechanics is the stress and strain in a solid beam which is well described by macroscopic equations but at the tip of a crack modeling details on a microscale are needed. A common dif?culty with the simulation of these problems and many ot...