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The Local Group is a small cluster of galaxies that includes the Milky Way. At least half of all galaxies in the Universe are thought to belong to similar groups. This authoritative volume provides a comprehensive synthesis of what is known about the Local Group. It begins with a summary of each member galaxy, as well as those galaxies previously regarded as possible members. The book examines the mass, stability and evolution of the Local Group as a whole and includes many important previously unpublished results and conclusions. With clarity, Professor van den Bergh provides a masterful summary of all that is known about the galaxies of the Local Group and their evolution, and expertly places this knowledge in the wider context of on-going studies of galaxy formation and evolution, the cosmic distance scale, and the conditions in the early Universe.
Globular clusters are roughly spherical, densely packed groups of stars found around galaxies. Most globular clusters probably formed at the same time as their host galaxies. Therefore they provide a unique fossil record of the conditions during the formation and early evolution of galaxies. This volume presents a comprehensive review of globular cluster systems. It summarizes their observed properties and shows how these constrain models of the structure of stars, the formation and evolution of galaxies and globular clusters, and the age of the Universe. For graduate students and researchers, this timely volume provides the definitive reference on globular cluster systems.
It is the task of the engineer, as of any other professional person, to do everything that is reasonably possible to analyse the difficulties with which his or her client is confronted, and on this basis to design solutions and implement these in practice. The distributed hydrological model is, correspondingly, the means for doing everything that is reasonably possible - of mobilising as much data and testing it with as much knowledge as is economically feasible - for the purpose of analysing problems and of designing and implementing remedial measures in the case of difficulties arising within the hydrological cycle. Thus the aim of distributed hydrologic modelling is to make the fullest use of cartographic data, of geological data, of satellite data, of stream discharge measurements, of borehole data, of observations of crops and other vegetation, of historical records of floods and droughts, and indeed of everything else that has ever been recorded or remembered, and then to apply to this everything that is known about meteorology, plant physiology, soil physics, hydrogeology, sediment transport and everything else that is relevant within this context. Of course, no matter how much data we have and no matter how much we know, it will never be enough to treat some problems and some situations, but still we can aim in this way to do the best that we possibly can.
Both an expert and a collector, James Geary has devoted his life to aphorisms-and the last few years to organizing, indexing, and even translating them. The result is Geary's Guide, featuring aphorists like Voltaire, Twain, Shakespeare, Nietzsche, Woody Allen, Muhammad Ali, Emily Dickinson, and Mae West, as well as international practitioners appearing in English for the first time. But it is more than just a conventional anthology. It is also an encyclopedia, containing brief biographies of each author in addition to a selection of his or her aphorisms. The book is a field guide, too, with aphorists organized into eight different "species," such as Comics, Critics & Satirists; Icons & Iconoclasts; and Painters & Poets. The book's two indexes-by author and by subject-make it easily searchable, while its unique organizational structure and Geary's lively biographical entries set it apart from all previous reference works. A perfect follow-up to Geary's New York Times bestseller The World in a Phrase, Geary's Guide is eminently suitable for browsing or for sustained reading. A comprehensive guide to our most intimate, idiosyncratic literary form, the book is an indispensable tool for writers and public speakers as well as essential reading for all language lovers.