Scalar diffraction from a circular aperture is a ubiquitous problem that arises in a variety of disciplines, such as optics (lenses), acoustics (speakers), electromagnetics (dish antennas), and ultrasonics (piston transducers). The problem endures despite centuries of research because each new generation of researchers rediscovers it and adds some novel insight or new result to the existing literature. Scalar Diffraction from a Circular Aperture promises a few new results and several novel insights, particularly with regard to spatial averaging. Although the text emphasizes ultrasonic diffraction, the results and insights developed are general and may be applied to the many practical problems involving scalar diffraction from a circular aperture. Included are novel insights on mirror-image diffraction, autoconvolution diffraction, and coherent and incoherent averaging. Examples from ultrasonic imaging, a coherent imaging modality, are used to develop a fairly general theory that connects over a century of research on scalar diffraction from a circular aperture. The material is based on a synthesis of mathematics, physical optics, linear systems theory, and scalar diffraction theory. Thus, engineers, scientists, mathematicians, and students working in optics, acoustics, antenna design, biomedical engineering, non-destructive testing, and astronomy will find Scalar Diffraction from a Circular Aperture interesting, provocative, and useful.
From the good sisters and monks of the 11th century, hospice care grew through the passions of 20th century people like Dame Cecily Saunders and Elizabeth Kubler-Ross, and into the recognized modality it is today of compassionate and palliative care for those who are on their final journal from this world. Pastor Lopez rightly fills this name as he reaches out, not only to patients and their families, but the team of nurses, doctors, social workers and caregivers who o-ffer their hands and hearts to those in need. Within these pages you will find practical and compassionate words, along with hands and a heart that knows the pain of loss and feet that are willing to accompany the reader on their journey.
This informed Christian response to more than one hundred common questions regarding the ethics of war demonstrates the viability of just-war reasoning in responding to contemporary geopolitical challenges.
The sixth edition of Environment and Society continues to connect issues about human societies, ecological systems, and the environment with data and perspectives from different fields. While the text looks at environmental issues from a primarily sociological viewpoint, it is designed for courses in Environmental Sociology and Environmental Issues in departments of Sociology, Environmental Studies, Anthropology, Political Science, and Human Geography. Clearly defined terms and theories help familiarize students from various backgrounds with the topics at hand. Each of the chapters is significantly updated with new data, concepts, and ideas. Chapter Three: Climate Change, Science and Diplomacy, is the most extensively revised with current natural science data and sociological insights. It also details the factors at play in the establishment of the Paris Agreement and its potential to affect global climate change. This edition elevates questions of environmental and climate justice in addressing the human-environment relations and concerns throughout the book. Finally, each chapter contains embedded website links for further discussion or commentary on a topic, concludes with review and reflection questions, and suggests further readings and internet sources.
This revision of a classic volume presents state-of-the-art reviews of established and emerging areas of communication science and provides an intellectual compass that points the way to future theorizing about communication processes. In this Second Edition of The Handbook of Communication Science, editors Charles R. Berger, Michael E. Roloff, and David Roskos-Ewoldsen bring together an impressive array of communication scholars to explore and synthesize the varying perspectives and approaches within the dynamic field of communication science. After first addressing the methods of research and the history of the field, the Handbook then examines the levels of analysis in communication (individual to macro-social), the functions of communication (such as socialization and persuasion), and the contexts in which communication occurs (such as couples, families, organizations, and mass media). Key Features: Draws on the scholarship and expertise of leading communication scholars who explore different aspects of the field Covers all facets of communication science, from the historical and theoretical to the practical and applied Covers the latest theoretical developments in the field, as well as alternative methodologies and levels of analysis Explores key communication contexts of the 21st century, including interpersonal dimensions of health communication, the scientific investigation of marital and family communication, and computer-mediated communication Includes incisive analyses, literature reviews, bibliographies, and suggestions for future research The Handbook of Communication Science, Second Edition, is an essential reference resource for scholars, practitioners, and students. It is appropriate for upper-level undergraduate or graduate courses in Communication and Media Studies and Mass Communication.
The definitive reference in the field for more than 35 years, Creasy and Resnik's Maternal-Fetal Medicine provides today's MFM practitioners with authoritative, comprehensive guidance on every aspect of this fast-changing field. The fully revised 9th Edition brings you up to date with the latest evidence-based guidelines and research as well as the fundamental scientific foundation needed for effective practice, helping you minimize complications and ensure the best possible outcomes for your patients. Renowned experts in obstetrics, gynecology, and perinatology provide valuable information in every area of complex obstetric care, highlighting the most commonly encountered anomalies and providing clear guidelines for obstetric and neonatal management. - Offers comprehensive updates on rapidly changing topics, including extensively revised genetic content throughout. - Includes two new chapters: maternal and fetal viral infections, including COVID-19; and sexually transmitted disease, covering the epidemiology, pathogenesis, diagnosis, and treatment of individual infectious diseases that may complicate pregnancy. - Contains user-friendly features such as numerous diagnostic and treatment algorithms for quick access to current protocols; key points at the end of each chapter; and counseling pearls with practical guidance on patient consultation. - Features a comprehensive imaging section, including a video library to aid in everyday diagnosis. - Shares the expertise of a renowned editorial team—including new co-editors Drs. Lorraine Dugoff and Judette M. Louis—who lead authors representing top institutions from around the globe. - Enhanced eBook version included with purchase. Your enhanced eBook allows you to access all of the text, figures, and references from the book on a variety of devices.
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