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Passive Treatments for Mine Drainage: A Guide for Early Researchers (SpringerBriefs in Applied Sciences and Technology)

by Cassandra Chidiac Aaron Bleasdale-Pollowy Andrew Holmes Frank Gu

This book allows readers to grasp both the fundamentals and the latest technological advances in the field of mine drainage, which is increasingly crucial both environmentally and economically. Its extensive coverage of current and promising passive treatment technologies, combined with numerous practical guides, makes it an indispensable tool for early researchers seeking promising trends and identifying gaps.The book systematically explores recent literature on passive treatment research, classifying them as preventative, in-situ, and ex-situ solutions. It covers relevant passive treatments such as permeable reactive barriers, constructed wetlands, gravel bed reactors, saturated rock fills, and passivation techniques, among other common source control tactics. Each technology is discussed in terms of principal mechanisms, state-of-the-art technological advances, advantages and disadvantages, and suitability for a given mine drainage chemistry and flow regime. The book provides a comprehensive view of the entire field, offering researchers and policymakers a reference guide, research ideas, understanding, and practical applications for each technology.Furthermore, the contains an overview of recent trends in material selection for passive treatment applications, primarily through the use of industrial waste and by-products, which incorporate more sustainable practices in mine drainage remediation. Uniquely, the manuscript includes a flowchart based on water chemistry and flow rates to guide readers to ideal treatment options, along with written analysis to further support the readers’ decision-making. Overall, this equips early researchers in the field with knowledge of fundamentals and promising research routes when dealing with different mine drainage complexities while also providing them with promising research avenues that can advance the field further.

Passive Vibration Control of Structures

by Suhasini Madhekar Vasant Matsagar

Research in vibration response control deals not only with prevention of catastrophic failures of structures during natural or accidental/manmade hazards but also ensures the comfort of occupants through serviceability. Therefore, the focus of this book is on the theory of dynamic response control of structures by using different kinds of passive vibration control devices. The strategies used for controlling displacement, velocity, and acceleration response of structures such as buildings, bridges, and liquid storage tanks under the action of dynamic loads emanating from earthquake, wind, wave, and so forth are detailed. The book: Explains fundamentals of vibration response control devices and their practical applications in response mitigation of structures exposed to earthquake, wind, and wave loading Offers a comprehensive overview of each passive damper, its functioning, and mathematical modeling in a dynamical system Covers practical aspects of employing the passive control devices to some of the benchmark problems that are developed from existing buildings and bridges in different countries worldwide Includes MATLAB® codes for determining the dynamic response of single degree of freedom (SDOF) and multi-degree of freedom (MDOF) systems along with computational models of the passive control devices This book is aimed at senior undergraduate students, graduate students, and researchers in civil, earthquake, aerospace, automotive, mechanical engineering, engineering dynamics, and vibration control, including structural engineers, architects, designers, manufacturers, and other professionals.

The Passivhaus Designer’s Manual: A technical guide to low and zero energy buildings

by Christina J. Hopfe Robert S. McLeod

Passivhaus is the fastest growing energy performance standard in the world, with almost 50,000 buildings realised to date. Applicable to both domestic and non-domestic building types, the strength of Passivhaus lies in the simplicity of the concept. As European and global energy directives move ever closer towards Zero (fossil) Energy standards, Passivhaus provides a robust ‘fabric first’ approach from which to make the next step. The Passivhaus Designers Manual is the most comprehensive technical guide available to those wishing to design and build Passivhaus and Zero Energy Buildings. As a technical reference for architects, engineers and construction professionals The Passivhaus Designers Manual provides: State of the art guidance for anyone designing or working on a Passivhaus project; In depth information on building services, including high performance ventilation systems and ultra-low energy heating and cooling systems; Holistic design guidance encompassing: daylight design, ecological materials, thermal comfort, indoor air quality and economics; Practical advice on procurement methods, project management and quality assurance; Renewable energy systems suitable for Passivhaus and Zero Energy Buildings; Practical case studies from the UK, USA, and Germany amongst others; Detailed worked examples to show you how it’s done and what to look out for; Expert advice from 20 world renowned Passivhaus designers, architects, building physicists and engineers. Lavishly illustrated with nearly 200 full colour illustrations, and presented by two highly experienced specialists, this is your one-stop shop for comprehensive practical information on Passivhaus and Zero Energy buildings.

The Past and Future City: How Historic Preservation is Reviving America's Communities

by Ms Stephanie Meeks Mr Kevin C. Murphy

InThe Past and Future City,Stephanie Meeks, the president of the National Trust for Historic Preservation, describes in detail, and with unique empirical research, the many ways that saving and restoring historic fabric can help a city create thriving neighborhoods, good jobs, and a vibrant economy. She explains the critical importance of preservation for all our communities, the ways the field of historic preservation has evolved to embrace the challenges of the twenty-first century, and the innovative work being done in the preservation space now.This book is for anyone who cares about cities, places, and saving America's diverse stories in a way that will bring us together and help us better understand our past, present, and future.

The Past and Future City: How Historic Preservation is Reviving America's Communities

by Ms Stephanie Meeks Mr Kevin C. Murphy

InThe Past and Future City,Stephanie Meeks, the presidof the National Trust for Historic Preservation, describes in detail, and with unique empirical research, the many ways that saving and restoring historic fabric can help a city create thriving neighborhoods, good jobs, and a vibrant economy. She explains the critical importance of preservation for all our communities, the ways the field of historic preservation has evolved to embrace the challenges of the twenty-first century, and the innovative work being done in the preservation space now.This book is for anyone who cares about cities, places, and saving America's diverse stories in a way that will bring us together and help us better understand our past, present, and future.

Past Climate Variability in South America and Surrounding Regions

by Florence Sylvestre Francoise Vimeux Myriam Khodri

This book groups together overviews and original research papers dealing with South American climate variability from the Last Glacial Maximum to the Holocene. The contributions deal with tropical, temperate and high latitudes climate variability in South America and in surrounding regions (including Pacific and Atlantic Oceans and Antarctica). It offers results obtained from both natural climate archives and recent simulations from coupled climate models. The objective is to propose a state of the art about our knowledge of past climate variability in South America. Specifically, this book aims at presenting the whole available observations and at discussing climate mechanisms, specifically the low to high latitude teleconnections on that continent which spreads out from the equator to Patagonia. It is written by an expert group of climate change scientists, and presents an insight into dynamics of the past and provides climate modellers with work of reference for data-model comparison. The book is an advanced but very readable text essential for all students and scientists interested in global environmental change.

Past Environments of Mexico: Unveiling the Past Environments of a Megadiverse Country Through its Fossil Record (Springer Geology)

by Rosalía Guerrero-Arenas Eduardo Jiménez-Hidalgo

Mexico is a biodiverse country. The dynamics of environments from Mexico played a crucial role in the history of North American biota. This book analyzes the paleoenvironmental conditions using several biological groups and various methods. This book also demonstrates how this information is specifically used to elucidate Mexico‘s past environments and habitats (terrestrial, freshwater, and marine). This book fills an existing editorial gap since much of the information is dispersed in several bibliographic sources. The authors are active paleontologists in diverse Mexican universities and research centers. Their research activities contribute to the knowledge of the Mexican biota through geologic time.

Past, Present and Future of a Habitable Earth: The Development Strategy of Earth Science 2021 to 2030 (SpringerBriefs in Earth System Sciences)

by Res. Group Dev Strategy of Earth Science

This perspective of this book views Earth's various layers as a whole system, and tries to understand how to achieve harmony and sustainable development between human society and nature, with the theme of " habitability of the Earth." This book is one effort at providing an overview of some of the recent exciting advances Chinese geoscientists have made. It is the concerted team effort of a group of researchers from diverse backgrounds to generalize their vision for Earth science in the next 10 years. The book is intended for scholars, administrators of the Science and Technology policy department, and science research funding agencies. This is an open access book.

The Past, Present and Future of Sustainable Management: From the Conservation Movement to Climate Change

by Stephen Cummings Todd Bridgman

We might think sustainable management is a new idea, created in the 1960s by enlightened modern scientists. We might think that it puts us on a new path, beyond what management was originally about. But this is not true. Sustainable management is as old as civilization and was a foundation stone of management science as it was formed in the first decade of the 20th century. Recovering this forgotten past provides deeper roots and greater traction to advance sustainable management in our own times.This book charts a history of sustainable management from premodern times, through the birth of management science as an offshoot of the conservation movement, to the present day. The authors argue that modern tools like Triple Bottom Line reporting and multiple Sustainable Development Goals may be less useful than a return to a more fundamental and holistic view of management.

Past Progress: Time and Politics at the Borders of China, Russia, and Korea

by Ed Pulford

While anxiety abounds in the old Cold War West that progress – whether political or economic – has been reversed, for citizens of former-socialist countries, murky temporal trajectories are nothing new. Grounded in the multiethnic frontier town of Hunchun at the triple border of China, Russia, and North Korea, Ed Pulford traces how several of global history's most ambitiously totalizing progressive endeavors have ended in cataclysmic collapse here. From the Japanese empire which banished Qing, Tsarist, and Choson dynastic histories from the region, through Chinese, Soviet, and Korean socialisms, these borderlands have seen projections and disintegrations of forward-oriented ideas accumulate on a grand scale. Taking an archaeological approach to notions of historical progress, the book's three parts follow an innovative structure moving backwards through linear time. Part I explores "post-historical" Hunchun's diverse sociopolitics since high socialism's demise. Part II covers the socialist era, discussing cross-border temporal synchrony between China, Russia, and North Korea. Finally, Part III treats the period preceding socialist revolutions, revealing how the collapse of Qing, Tsarist, and Choson dynasties marked a compound "end of history" which opened the area to projections of modernity and progress. Examining a borderland across linguistic, cultural, and historical lenses, Past Progress is a simultaneously local and transregional analysis of time, borders, and the state before, during, and since socialism.

Pastimes: The Context of Contemporary Leisure (Fifth Edition)

by Ruth V. Russell

Originally published in 1996, "Pastimes" introduced an exciting new text that explored leisure and recreation philosophy and science, the various subfields, and the leisure services industry. The purpose of this fifth edition of Pastimes is to extend the discussion about leisure in society to new concepts supported by new research findings and commentary. Throughout, the author has pursued the most interesting, relevant, exciting, and contemporary information possible. First, as an introduction to the phenomenon of leisure, the book must be current. Momentous changes, actual and alleged, have always been the root of leisure expressions and experiences. To match, Pastimes again reflects a wide range of material from the disciplines of leisure studies, sociology, psychology, economics, political science, anthropology, geography, the humanities, and media and cultural studies. Second, as a learning tool, this fifth edition teaches more. It contains new illustrations of concepts through field-based cases, biographical features, exploratory activities, and research studies. While the basic organisation remains similar, in addition to new material, some former concepts have been relocated. For example, the topic of history and its meanings for leisure is now combined into one chapter. Also, the discussion of work is now combined with that about economics in the same chapter. Also, theories explaining leisure behaviour are now organised according to their home discipline. A chapter on well-being and leisure is a new feature, and because of the amazing speed of change, the chapter on leisure and technology has been completely rewritten. The chapter on time has also been expanded. Finally, the last chapter on leisure systems has a new section on professional preparation. But, more than a textbook, Pastimes is very much a point of view. Leisure is presented as a human phenomenon that is individual and collective, vital and frivolous, historical and contemporary, factual and subjective, good and bad.

Pastoral practices in High Asia

by Hermann Kreutzmann

In conventional views, pastoralism was classified as a stage of civilization that needed to be abolished and transcended in order to reach a higher level of development. In this context, global approaches to modernize a rural society have been ubiquitous phenomena independent of ideological contexts. The 20th century experienced a variety of concepts to settle mobile groups and to transfer their lifestyles to modern perceptions. Permanent settlements are the vivid expression of an ideology-driven approach. Modernization theory captured all walks of life and tried to optimize breeding techniques, pasture utilization, transport and processing concepts. New insights into other aspects of pastoralism such as its role as an adaptive strategy to use marginal resources in remote locations with difficult access could only be understood as a critique of capitalist and communist concepts of modernization. In recent years a renaissance of modernization theory-led development activities can be observed. Higher inputs from external funding, fencing of pastures and settlement of pastoralists in new townships are the vivid expression of 'modern' pastoralism in urban contexts. The new modernization programme incorporates resettlement and transformation of lifestyles as to be justified by environmental pressure in order to reduce degradation in the age of climate change.

Pastoralism and Development in Africa: Dynamic Change at the Margins (Pathways to Sustainability)

by Author Unknown

Once again, the Horn of Africa has been in the headlines. And once again the news has been bad: drought, famine, conflict, hunger, suffering and death. The finger of blame has been pointed in numerous directions: to the changing climate, to environmental degradation, to overpopulation, to geopolitics and conflict, to aid agency failures, and more. But it is not all disaster and catastrophe. Many successful development efforts at ‘the margins’ often remain hidden, informal, sometimes illegal; and rarely in line with standard development prescriptions. If we shift our gaze from the capital cities to the regional centres and their hinterlands, then a very different perspective emerges. These are the places where pastoralists live. They have for centuries struggled with drought, conflict and famine. They are resourceful, entrepreneurial and innovative peoples. Yet they have been ignored and marginalised by the states that control their territory and the development agencies who are supposed to help them. This book argues that, while we should not ignore the profound difficulties of creating secure livelihoods in the Greater Horn of Africa, there is much to be learned from development successes, large and small. This book will be of great interest to students and scholars with an interest in development studies and human geography, with a particular emphasis on Africa. It will also appeal to development policy-makers and practitioners.

Pastoralists: Equality, Hierarchy, and the State

by Philip Carl Salzman

Drawing upon the author's extensive field research among pastoral peoples in the Middle East, India, and the Mediterranean, and on more than 30 years of comparative study of pastoralists around the world, Pastoralists is an authoritative synthesis of the varieties of pastoral life. At an ethnographic level, the concise volume provides detailed analyses of divergent types of pastoral societies, including segmentary tribes, tribal chiefdoms, and peasant pastoralists. At the same time, it addresses a set of substantive theoretical issues: ecological and cultural variation, equality and inequality, hierarchy and the basis of power, and state power and resistance. The book validates "pastoralists" as a conceptual category even as it reveals the diversity of societies, subsistence strategies, and power arrangements subsumed by that term.

Path Integrals in Stochastic Engineering Dynamics

by Ioannis A. Kougioumtzoglou Pol D. Spanos Apostolos F. Psaros

This book organizes and explains, in a systematic and pedagogically effective manner, recent advances in path integral solution techniques with applications in stochastic engineering dynamics. It fills a gap in the literature by introducing to the engineering mechanics community, for the first time in the form of a book, the Wiener path integral as a potent uncertainty quantification tool. Since the path integral flourished within the realm of quantum mechanics and theoretical physics applications, most books on the topic have focused on the complex-valued Feynman integral with only few exceptions, which present path integrals from a stochastic processes perspective. Remarkably, there are only few papers, and no books, dedicated to path integral as a solution technique in stochastic engineering dynamics. Summarizing recently developed techniques, this volume is ideal for engineering analysts interested in further establishing path integrals as an alternative potent conceptual and computational vehicle in stochastic engineering dynamics.

The Path to Net Zero for the Fashion Industry: Five Strategies for Decarbonisation

by Simon J. Kew

This book uses a quantitative science-based approach to explain where the greenhouse gas (GHG) emissions emitted by the fashion industry are generated and it explores what strategies can be deployed to achieve Net Zero by 2050. With GHG emissions currently predicted to triple by the middle of the century, the fashion industry is far off course to reach Net Zero, as set out in the Paris Agreement. With misinformation and greenwashing representing an ever-growing barrier to potential solutions, the book aims to demystify the source of GHG emissions from the industry, breaking down in detail their origin, while identifying the steps that can be taken when designing and sourcing new products. Detailing the market drivers and trends in fashion consumption, it argues that change should be guided by science-based quantitative principles. Accessibly written with key insights at the end of each chapter, this book will enable the reader to understand the tactics to tackle decarbonisation, and ultimately outline five main strategies that can be deployed by the fashion and textile industries to align with the Paris Agreement. This book serves as a practical guide for designers, buyers and the fashion industry in general to develop and understand approaches and strategies to reduce energy consumption and the resulting GHG emissions to reach Net Zero.

Pathological Lives: Disease, Space and Biopolitics

by John Allen Nick Bingham Simon Carter Steve Hinchliffe

Pandemics, epidemics and food borne diseases are a major global challenge. Focusing on the food and farming sector, and mobilising social theory as well as empirical enquiry, Pathological Lives investigates current approaches to biosecurity and ask how pathological lives can be successfully ‘regulated’ without making life more dangerous as a result. Uses empirical and social theoretical resources developed in the course of a 40-month research project entitled ‘Biosecurity borderlands’ Focuses on the food and farming sector, where the generation and subsequent transmission of disease has the ability to reach pandemic proportions Demonstrates the importance of a geographical and spatial analysis, drawing together social, material and biological approaches, as well as national and international examples The book makes three main conceptual contributions, reconceptualising disease as situated matters, the spatial or topological analysis of situations and a reformulation of biopolitics Uniquely brings together conceptual development with empirically and politically informed work on infectious and zoonotic disease, to produce a timely and important contribution to both social science and to policy debate

Paths to a Green World: The Political Economy of the Global Environment

by Jennifer Clapp Peter Dauvergne

This comprehensive and accessible text fills the need for a political economy view of global environmental politics, focusing on the ways key economic processes affect environmental outcomes.

Paths to Clean Water Under Rapid Changing Environment in China (SpringerBriefs in Water Science and Technology)

by Yiping Li Lixiao Ni Yong Guo Xu Zhao Yue Dong Yu Cheng

This book mainly provides the current status of water pollution faced by China under rapid changing environment and the actions that have been taken for prevention and treatment of water pollution. It points out that the water pollution situation is severe. Facing water pollution, China’s experiences include several aspects on source control and pollution interception, internal nutrient removal of sediment, ecological restoration, and water transfer policy. There exists both the opportunity and challenge for the prevention and control of water pollution in China. The book contains numerous charts and diagrams which further illustrating China’s paths to clean water.

Pathways Through Applied and Computational Physics

by Nicolò Barbero Matteo Delfino Carlo Palmisano Gianfranco Zosi

This book is intended for undergraduates and young researchers who wish to understand the role that different branches of physics and mathematics play in the execution of actual experiments. The unique feature of the book is that all the subjects addressed are strictly interconnected within the context of the execution of a single experiment with very high accuracy, namely the redetermination of the Avogadro constant NA, one of the fundamental physical constants. The authors illustrate how the basic laws of physics are applied to describe the behavior of the quantities involved in the measurement of NA and explain the mathematical reasoning and computational tools that have been exploited. It is emphasized that all these quantities, although pertaining to a specific experiment, are of wide and general interest. The book is organized into chapters covering the interaction of electromagnetic radiation with single crystals, linear elasticity and anisotropy, propagation of thermal energy, anti-vibration mounting systems, and data analysis and B-spline interpolation. An essential feature is the focus on the role of Mathematica, an invaluable, fully integrated software environment for handling diverse scientific and technical computations.

Pathways to Demographic Adaptation: Perspectives on Policy and Planning in Depopulating Areas in Northern Europe (SpringerBriefs in Geography)

by Josefina Syssner

This book builds on case studies in depopulating and shrinking areas in Northern Europe. While most contemporary literature on shrinkage focuses on these issues from a planning standpoint, this book uniquely applies a policy perspective when approaching the material. The book assesses the potential of demographic adaptation policies to manage depopulation, that is, policy programs aiming at managing depopulation through adaptation, rather than through growth policies intended to foster population growth. In 6 chapters, the book acts as an up-to-date resource on demographic adaptation for master and Ph.D. students, researchers, and practitioners working in local and regional development, governance, and planning. Chapter 1 gives an overview of recent demographic trends in Northern Europe and introduces the theoretical differences between growth policy and adaptation policy. Chapter 2 accounts for the policy concept and introduces a framework for how local adaptation policies could be systematically analysed. Chapter 3 suggests that the Nordic welfare states exhibit two characteristics that prove to be relevant when discussing the consequences and policy implications of demographic decline, i.e. an extremely sparse population structure and an ambitious welfare assignment that in many respects has been devolved to the local level of government. Chapter 4 suggests that whether shrinkage constitutes a problem or not depends upon the interpretations of those in power, but also upon political, economic and geographic conditions Chapter 5 seeks to understand why local level policymakers avoid developing strategies for how to handle long-term population decline. Chapter 6 summarizes the points of the previous chapters, and concludes that local governments in shrinking areas ought to develop local adaptation policies. These policies, however, also need to be subjected to critical analysis, and the chapter introduces a model for how local adaptation policy priorities could be assessed in a more structured manner.

Pathways to Environmental Sustainability

by Roberta Salomone Giuseppe Saija

This book brings together, in a single volume, an overview of multiple applications of the concept of environmental sustainability, featuring examples of useful methodologies and tools for pursuing environmental targets, experiences and case studies spanning a variety of sectors, embracing both industry and research projects; and case studies applied to very different territorial contexts. The first section of the book covers methodologies and tools for environmental sustainability, including Industrial Ecology, Urban Metabolism, Life Cycle Assessment, analysis of industrial water footprint and such chemical technologies as Hypercritical Separation Technology (HYST). Part Two provides case studies of environmental sustainability in specific industrial sectors including electronics, pharmaceutical manufacturing, bio-energy, agriculture, food and residential construction retrofitting. Part Three explores experiences of environmental sustainability in territorial contexts on a local, regional or national scale. This section includes chapters on sustainability in the Republic of San Marino, the European "Covenant of Mayors" urban sustainability initiative and efforts to promote sustainability in Italy, Norway and Poland among others. The book concludes with a discussion of Common Agricultural Policy (CAP) in Objective I regions of Italy. Featuring the contributions of academics, managers operating in various productive sectors and consultants, the book aims to promote the growth and spread of scientific research and technological development for environmental sustainability.

Pathways to Industrialization and Regional Development

by Michael Storper Allen J. Scott

The world has seen a shift in socio-economic relations, in the patterns and processes of industrialization and regional development. The social regulation of the economic order, flexible production organization and industrial district formation have brought periods, places and pathways to the heart of economic debate. Pathways to Industrialization and Regional Development provides a platform from which to address a new economic order. All the major schools of thought are represented. Focussing upon the interactions between economic logic and political institutions at both the local and global levels, the authors set the agenda for the 1990s.

Pathways to Urban Sustainability

by Dominic A. Brose

The workshop was convened to explore the region's approach to urban sustainability, with an emphasis on building the evidence base upon which new policies and programs might be developed. Participants examined how the interaction of various systems (natural and human systems; energy, water, and transportation systems) affected the region's social, economic, and environmental conditions. The objectives of the workshop were as follows: - Discuss ways that regional actors are approaching sustainability- specifically, how they are attempting to merge environmental, social, and economic objectives. - Share information about ongoing activities and strategic planning efforts, including lessons learned. - Examine the role that science, technology, and research can play in supporting efforts to make the region more sustainable. - Explore how federal agency efforts, particularly interagency partnerships, can complement or leverage the efforts of other key stakeholders. Pathways to Urban Sustainability: A Focus on the Houston Metropolitan Region: Summary of a Workshop was designed to explore the complex challenges facing sustainability efforts in the Houston metropolitan region and innovative approaches to addressing them, as well as performance measures to gauge success and opportunities to link knowledge with action. In developing the agenda, the planning committee chose topics that were timely and cut across the concerns of individual institutions, reflecting the interests of a variety of stakeholders. Panelists were encouraged to share their perspectives on a given topic; however, each panel was designed to provoke discussion that took advantage of the broad experience of the participants.

Pathways to Urban Sustainability: Summary of a Workshop

by Dominic A. Brose

The workshop was convened to explore the region's approach to urban sustainability, with an emphasis on building the evidence base upon which new policies and programs might be developed. Participants examined how the interaction of various systems (natural and human systems; energy, water, and transportation systems) affected the region's social, economic, and environmental conditions. The objectives of the workshop were as follows: - Discuss ways that regional actors are approaching sustainability- specifically, how they are attempting to merge environmental, social, and economic objectives. - Share information about ongoing activities and strategic planning efforts, including lessons learned. - Examine the role that science, technology, and research can play in supporting efforts to make the region more sustainable. - Explore how federal agency efforts, particularly interagency partnerships, can complement or leverage the efforts of other key stakeholders. Pathways to Urban Sustainability: A Focus on the Houston Metropolitan Region: Summary of a Workshop was designed to explore the complex challenges facing sustainability efforts in the Houston metropolitan region and innovative approaches to addressing them, as well as performance measures to gauge success and opportunities to link knowledge with action. In developing the agenda, the planning committee chose topics that were timely and cut across the concerns of individual institutions, reflecting the interests of a variety of stakeholders. Panelists were encouraged to share their perspectives on a given topic; however, each panel was designed to provoke discussion that took advantage of the broad experience of the participants.

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Showing 18,851 through 18,875 of 28,522 results