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A simple look at stars.
Is the universe infinite, or is it just really big? Does nature abhor infinity? In startling and beautiful prose, Janna Levin's diary of unsent letters to her mother describes what we know about the shape and extent of the universe, about its beginning and its end. She grants the uninitiated access to the astounding findings of contemporary theoretical physics and makes tangible the contours of space and time—those very real curves along which apples fall and planets orbit. Levin guides the reader through the observations and thought-experiments that have enabled physicists to begin charting the universe. She introduces the cosmic archaeology that makes sense of the pattern of hot spots left over from the big bang, a pursuit on the verge of discovering the shape of space itself. And she explains the topology and the geometry of the universe now coming into focus—a strange map of space full of black holes, chaotic flows, time warps, and invisible strings. Levin advances the controversial idea that this map is edgeless but finite—that the universe is huge but not unending—a radical revelation that would provide the ultimate twist to the Copernican revolution by locating our precise position in the cosmos. As she recounts our increasingly rewarding attempt to know the universe, Levin tells her personal story as a scientist isolated by her growing knowledge. This book is her remarkable effort to reach across the distance of that knowledge and share what she knows with family and friends—and with us. Highly personal and utterly original, this physicist’s diary is a breathtaking contemplation of our deep connection with the universe and our aspirations to comprehend it.
The classic reference covering the diagnosis and treatment of all major ophthalmic diseases, as well as neurological and systemic diseases causing visual disturbance-extensively revised and updated Features State-of-the-art coverage of diagnostic techniques and therapeutic interventions for the full range of ophthalmic disorders Chapters dedicated to ophthalmic therapeutics, neuro-ophthalmology, ocular disorders associated with systemic diseases, immunologic diseases of the eye, pediatrics, genetics, preventive ophthalmology and lasers The latest clinical perspectives on such topics as: Treatments for age-related macular degeneration, including anti-VEGF therapies Intraocular steroid injections for retinal diseases Immunomodulatory drugs Treatment of corneal infections Medical and surgical treatments for glaucoma Detailed appendices on visual standards, practical factors in illumination, rehabilitation of the visually handicapped, and special services available to the blind Latest references
This book brings together information which is helpful to those with impaired vision. It is a reference, a guide, and a starting point for those who desire to know more about resources and technologies available to help them adjust and adapt to a life with sub-normal vision. Large print format.
This comprehensively updated and expanded revision of the successful second edition continues to provide detailed coverage of the ever-growing range of research topics in vision. In Part I, the treatment of visual physiology has been extensively revised with an updated account of retinal processing, a new section explaining the principles of spatial and temporal filtering which underlie discussions in later chapters, and an up-to-date account of the primate visual pathway. Part II contains four largely new chapters which cover recent psychophysical evidence and computational model of early vision: edge detection, perceptual grouping, depth perception, and motion perception. The models discussed are extensively integrated with physiological evidence. All other chapters in Parts II, III, and IV have also been thoroughly updated.
Spot is visiting his Grandpa at the fire station in this delightful fire-engine-shaped board book! Spot is visiting his Grandpa at the fire station, and he's very excited! Join Spot on his adventure by reading the story, and then play with the fire-engine shaped book. Spot books are perfect for reading about new experiences, early learning, and stories you can play with.
Nanochemistry: Chemistry of Nanoparticle Formation and Interactions provides an overview of the chemistry aspects of nanoparticle science, including nanoparticle synthesis, chemical properties, stability, applications and self-assembly behavior. The critical concepts discussed in this book represent the necessary toolbox for enabling the rational design of nanoparticle-based materials for target applications. After an introduction to standard analytical techniques used for nanoparticle characterization, four separate chapters cover inorganic, organic, polymer nanoparticles, and carbon nanostructures to highlight the synthetic protocols, structural intricacies, and chemical properties specific to each of these material classes. Finally, physicochemical phenomena governing self-assembly behavior of nanoparticles are also discussed in detail separately. This book is intended for senior undergraduate, graduate and postgraduate students and research scientists in nanoscience and nanotechnology, material science, chemistry, physics, biomedical sciences and relevant engineering fields that want to develop a deeper understanding of the governing chemical principles on the nanoscale. - Provides an up-to-date text reflecting the latest changes in the field, acting as a fully restructured successor text to Nanochemistry, 2nd Edition (Elsevier, 2013) by Klabunde and Sergeev - Leads the reader through the fundamental concepts and illustrative examples of inorganic, organic, and polymer nanoparticle formation, discussing, in detail, the aspects of synthetic geometry control, surface chemistry, and nanoparticle stability - Provides in-depth coverage of nanoparticle self-assembly behavior, including the self-assembly driving forces and approaches to control this process through nanoparticle design and environmental cues
This volume on Visual Psychophysics documents the current status of research aimed toward understanding the intricacies of the visual mechanism and its laws of operation in intact human perceivers. As can be seen from the list of contributors, the problems of vision engage the interest and experimental ingenuity of investi gators from a variety of disciplines. Thus we find authors affiliated with depart ments of biology, medical and physiological physics, ophthalmology, physics, physiology and anatomy, psychology, laboratories of neurophysiology, medical clinics, schools of optometry, visual and othcr types of research institutes. A continuing interplay between psychophysical studies and physiological work is everywhere evident. As more information about the physiological basis of vision accumulates, and new studies and analyses of receptor photochemistry and the neurophysiology of retina and brain appear, psychophysical studies of the intact organism become more sharply focused, sometimes more complex, and often more specialized. Technological advances have increased the variety and precision of the stimulus controls, and advances in measurement techniques have reopened old problems and stimulated the investigation of new ones. In some cases, new concepts are being drawn in to help further our under standing of the laws by which the visual mechanism operates; in other cases, ideas enunciated long ago have been reevaluated, developed more fully, and reified in terms of converging evidence from both psychophysical experiments and unit recordings from visual cells.