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1. |
Record Nr. |
UNISA990000645890203316 |
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Autore |
GEROULD, Winifred Gregory |
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Titolo |
A guide to Trollope / by Winifred Gregory Gerould and James Thayer Gerould |
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Pubbl/distr/stampa |
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Westport : Greenwood, 1970 |
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Descrizione fisica |
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Altri autori (Persone) |
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Disciplina |
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Collocazione |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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2. |
Record Nr. |
UNINA9910508309103321 |
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Autore |
Runge Jürgen |
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Titolo |
Quaternary Vegetation Dynamics : the African pollen database / / edited by Jürgen Runge [and three others] |
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Pubbl/distr/stampa |
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Taylor & Francis, 2021 |
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London : , : Taylor & Francis, , 2021 |
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ISBN |
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1-00-316276-2 |
1-000-43114-2 |
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Descrizione fisica |
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1 online resource (xviii, 417 pages) : illustrations |
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Collana |
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Disciplina |
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Soggetti |
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Paleoecology |
Paleoecology - Africa |
Vegetation dynamics |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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Sommario/riassunto |
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This book celebrates the relaunch of the African Pollen Database, presents state-of-the-art of modern and ancient pollen data from sub-Saharan Africa, and promotes Open Access science. Pollen grains are powerful tools for the study of past vegetation dynamics because they preserve well within sedimentary deposits and have a huge diversity in ornamentation that allows different taxa to be determined. The reconstruction of past vegetation from the examination of ancient pollen records thus can be used to characterize the nature of past landscapes (e.g. abundance of forests vs. grasslands), provide insights into changes in biodiversity, and gain empirical evidence of vegetation response to climatic change and human activity. In this, the 35th Volume of "Palaeoecology of Africa", we bring together new data and extensive synthetic reviews to provide novel insights into the relationships between human evolution, human activity, climate change and vegetation dynamics during the Quaternary, the last 2.6 million years. Current and ongoing climate and land-use change is exerting pressure on modern vegetation formations and threatening the livelihoods and wellbeing of many peoples in Africa. In this book the |
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focus is on the Quaternary because it is during this geological period that the modern vegetation formations developed into their current configurations against a backdrop of high magnitude global climate change (glacial-interglacial cycles), human evolution, and a growing human land-use footprint. In this book the latest information is presented and collated from around the African continent to parameterize past vegetation states, identify the drivers of vegetation change, and assess the vegetation resilience to change. To achieve this research from two broad themes are covered: (i) the present is the key to the past (i.e. studies which improve our understanding of modern environments so that we can better interpret evidence from the past), and (ii) the past is the key to the future (i.e. studies which unlock information on how and why vegetation changed in the past so one can better anticipate trajectories of future change). This Open Access book will provide a strong foundation for future research exploring past ecological, environmental and climatic change within Africa and the surrounding islands. The book is organized regionally (covering western, eastern, central, and southern Africa) and it contains specialized articles focused on particular topics (such as modern pollen-vegetation relationships and fire as a driver of vegetation change), as well as regional and pan-African syntheses drawing together decades of research to assess key scientific questions (including the role of climate in driving vegetation change and the role of vegetation change in human evolution). These articles will be useful to students and teachers from high school to the highest level of university who are interested in the origins and dynamics of vegetation in Africa. Furthermore, it is also meant to provide societally relevant information that can act as an inspiration for the development of sustainable management practices for the future. |
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3. |
Record Nr. |
UNINA9910437895003321 |
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Autore |
Pelgrom Marcel J.M |
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Titolo |
Analog-to-Digital Conversion / / by Marcel J.M. Pelgrom |
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Pubbl/distr/stampa |
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New York, NY : , : Springer New York : , : Imprint : Springer, , 2013 |
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ISBN |
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Edizione |
[2nd ed. 2013.] |
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Descrizione fisica |
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1 online resource (597 p.) |
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Disciplina |
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Soggetti |
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Electronic circuits |
Electronics |
Microelectronics |
Signal processing |
Image processing |
Speech processing systems |
Circuits and Systems |
Electronics and Microelectronics, Instrumentation |
Signal, Image and Speech Processing |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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Note generali |
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Description based upon print version of record. |
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Nota di bibliografia |
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Includes bibliographical references and index. |
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Nota di contenuto |
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Introduction -- Components and Definitions -- Sampling -- Sample and Hold -- Quantization -- Reference Circuits -- Digital-to-Analog Conversion -- Analog-to-Digital Conversion.- Sigma-Delta Modulation -- Characterization and Specification -- Technology -- System Aspects of Conversion. |
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Sommario/riassunto |
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This textbook is appropriate for use in graduate-level curricula in analog to digital conversion, as well as for practicing engineers in need of a state-of-the-art reference on data converters. It discusses various analog-to-digital conversion principles, including sampling, quantization, reference generation, nyquist architectures and sigma-delta modulation. This book presents an overview of the state-of-the-art in this field and focuses on issues of optimizing accuracy and speed, while reducing the power level. This new, second edition emphasizes novel calibration concepts, the specific requirements of new systems, the consequences of 45-nm technology and the need for |
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a more statistical approach to accuracy. Pedagogical enhancements to this edition include more than twice the exercises available in the first edition, solved examples to introduce all key, new concepts and warnings, remarks and hints, from a practitioner’s perspective, wherever appropriate. Considerable background information and practical tips, from designing a PCB, to lay-out aspects, to trade-offs on system level, complement the discussion of basic principles, making this book a valuable reference for the experienced engineer. Covers the most relevant developments in analog-to-digital conversion, in a pedagogical framework suited for both graduate-level courses and professionals; Updates the first edition of this book to include novel calibration concepts, the specific requirements of new systems, the consequences of 45-nm CMOS technology and some first results with metal-gate 28-nm technologies; Emphasizes the need for a more statistical approach to accuracy, not only as a theoretical exercise, but also to calculate circuit (mal)function and design yield; Provides insight on how to choose parameters for designing circuits, using extended examples of how to make that choice for an amplifier, a track-and-hold circuit, a full-flash converter, a conversion stage or a filter for sigma-delta modulator; Includes more than twice the exercises of the first edition, as well as solved examples to help introduce each new concept. |
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