This text is intended to provide an in-depth, self-contained, treatment of optical waveguide theory. We have attempted to emphasize the underlying physical processes, stressing conceptual aspects, and have developed the mathematical analysis to parallel the physical intuition. We also provide comprehensive supplementary sections both to augment any deficiencies in mathematical background and to provide a self-consistent and rigorous mathematical approach. To assist in. understanding, each chapter con centrates principally on a single idea and is therefore comparatively short. Furthermore, over 150 problems with complete solutions are given to demonstrate applications of the theory. Accordingly, through simplicity of approach and numerous examples, this book is accessible to undergraduates. Many fundamental topics are presented here for the first time, but, more importantly, the material is brought together to give a unified treatment of basic ideas using the simplest approach possible. To achieve such a goal required a maturation of the subject, and thus the text was intentionally developed over a protracted period of the last 10 years.
In the comparative physiology of photoreception by the Protista and the invertebrates two aspects are emphasized: (1) the diversity of visual processes in these groups and (2) their bearing upon general mechanisms of photoreception. Invertebrates have evolved a far greater variety of adaptations than vertebrates modifications aiding survival in the remarkably different biotopes they occupy. The number of species in itself suggests this multiformity; each of them has peculiarities of its own, in morphology as well as in physiology and behavior. But these special adaptations are variations on a few great themes. Although the catalogue of invertebrate species is immense, the literature concerning them nearly rivals it in extent-even if one considers only that fraction dealing with visual physiology. Taxonomy proceeds by grouping the species, categorizing them in genera, families, orders, and progressively larger units. Similarly, comparative physiology aims at an analogous, more or less compre hensive, classification. This Part A of Volume VII/6, like Part B that follows it, emphasizes the broad questions that concern groups larger than the individual species; in some cases these questions have general applicability. The middle course between approaches that are too specialized and those that are too general is often elusive, but here we attempt to follow it. The vast number of special adaptations-probably, as we have said, as large as the number of species-is beyond the range even of a handbook.
The Collected Wisdom of a Beloved Christian Author A.W. Tozer's fans stretch across the world, and his message continues to resonate with today's Christians. Whether you're a Tozer fan yourself or someone looking for an introduction to his writing, this is an ideal resource book of the prolific author and pastor's thoughts. The Quotable Tozer is organized around dozens of topics, including popular culture, the nature of God, spiritual warfare, God's Word, and the afterlife. In addition to the book's appeal to the curious Tozer fan, it is also perfect for preachers, teachers, and authors who want to include Tozer quotes in their sermons and writings. Going beyond the most well-known Tozer books, this volume gives readers access to the true breadth of Tozer's work and thought. Whether you wish to browse the volume for unexpected wisdom, or reference Tozer's thoughts on a particular topic, this book will open your eyes to the depth and insight of one of the most cherished pastors in recent history.
One of the 20th century’s most prolific and inspiring communicators has become one of the 21st century’s most prophetic and popular writers. Thanks to the careful curation of James L. Snyder, a pastor in Tozer’s church denomination who has exclusive access to a treasure trove of unpublished Tozer content, we have Tozer’s teachings on a vast number of topics. And now, for the first time, there is a new daily devotional featuring never-before-published content. The famed evangelist Leonard Ravenhill, who knew Tozer personally, said, “To enter into Dr. Tozer’s presence was an awe-inspiring event.” Now, with My Daily Pursuit, readers will be able to do even more as they enter into the presence of Jesus every day through this awe-inspiring book
A.W. Tozer's Follow-up to The Knowledge of the Holy We were created in the image of God, and to understand who we are, we need to understand who God is. His very character and nature are reflected through us. Unless we fully grasp who we are, we'll never become all God wants us to be. Delighting in God is the message Tozer intended to be the follow-up to The Knowledge of the Holy. He demonstrates how the attributes of God--those things God has revealed about himself--are a way to understand the Christian life of worship and service. We are here to serve and adore him, but we can only fulfill that role by acknowledging who he is, which is the essence of the Christian life and the source of all our fulfillment, joy, and comfort.
A Call for Every Christian to Move from Shallow Living to Deep Faith In The Dangers of a Shallow Faith, renowned theologian A.W. Tozer warns believers in Christ against the great danger of spiritual lethargy. He urges Christians to be aware of the times in which they live and to recognize how attempting to live a life for God on autopilot will actually undermine their faith. For Tozer, the risks are so significant that "breaking out from the tyranny of spiritual lethargy--whatever the cost--should be the number-one priority of every Christian." In this never-before-published compilation, followers of Christ will discover anew the importance of standing boldly against spiritual and moral slumber. They will also see the importance of remaining awake in the face of constant temptation and distraction. Discover the spiritual awakening and change the Holy Spirit can bring to your life as you surrender completely to God and walk in a deeper faith!
Just as in our day, people under the teaching ministry of A.W. Tozer wondered about the end times. How should we read the book of Revelation? What does it mean for how believers live? In this never-before-published book, today's Christians can learn from one of the twentieth-century church's most profound thinkers and pastors. Tozer's teaching on Revelation offers a fresh and timely perspective on the purpose of prophecy, which the renowned writer believed was to lift our gaze from the immediate to the eternal. Preparing for Jesus' Return offers readers a panoramic view of what is to come and explores what it means for individuals, churches, and the world.
Does the church use words that have lost their meaning? Are there Christian words and phrases that have lost their power to convict the human spirit and bring transformation to the world? One of the twentieth century's most renowned prophetic thinkers, A.W. Tozer, saw a dangerous trend gaining momentum even before his death--a trend that has become commonplace now in the twenty-first century. In this never-before-published book, Tozer sounds his alarm for the modern church: We must stop parroting words carelessly and instead allow the meaning that these words convey to empower, shape, and direct the work of the church. Yet Reclaiming Christianity is not just a warning; it is a spiritual guidebook for reconnecting to the deepest meaning of Christianity's sacred messages.
We live in an unprecedented era of distraction and temptation. You can't pick up your phone, turn on your television, or walk out your door without being bombarded with images and messages of worldly pleasures and pursuits. In this never-before-published compilation of teachings, A.W. Tozer offers piercing insight and practical application to help you make God-honoring, life-giving decisions in a culture that prizes what is evil. You will learn how to · recognize the tactics of the enemy · resist temptation · prevent the devil from taking advantage of you · walk closely and confidently with God The vanity of this world is great, but we serve a God greater still. Here is the wisdom and biblical insight you need to resist the devil and stand firm on holy ground.
During his ministry, which included extended pastorates in Chicago and Toronto, Dr. Tozer was often referred to as a prophet. That doesn't mean he predicted future events, but rather he spoke God's truth to believers and the culture, even if it meant disrupting the status quo. Even in the Bible, prophets were much more likely to hold God's people and their leaders accountable to the truth of God's Word than to foretell the future. The encouragement in Voice of a Prophet is that the church today is in desperate need of the kind of prophet Tozer embodied and describes in this important book. Using the lives of such prophets as Elijah, Elisha, and John the Baptist, Tozer underscores the importance of the ministry of the prophet in our world today.
How can I know God's will for me, personally? It's a question that haunts us all at times--maybe when we're looking for the right job, thinking about moving to a new city, or deciding whether or not to get married. At every stage we have difficult decisions to make, and we long for God's direction and his warm reassurance that we're heading the right way. A Cloud by Day, a Fire by Night captures Tozer's teaching on the will of God taken from sermons he preached just before he left his successful church in Chicago. Tozer was no stranger to facing difficult decisions, and his wisdom and biblical insight will help guide you in decisions of your own. The title comes from the story of God leading his people out of Egypt into the promised land. In the same way, let this book help reveal where he is leading and reassure you that he will be by your side every step of the way.
Many Christians are familiar with the prophetic voice of Tozer, but few living today were blessed to sit under his weekly teaching from the pulpit. The Gospel of John was Tozer's favorite book of the Bible, and the focus of these writings (adapted from sermons given to his parishioners) is the Incarnation and what it means for believers' lives. Christ came down to earth to lift men and women up into the heavenlies. No other New Testament writer, not even the amazing apostle Paul, presents Christ with a passion equal to John's, whom Jesus called the Beloved. Tozer captures the spirit of John and presents his winsome and enthralling portrait of Christ, challenging readers to discover a fresh and overwhelming desire for Him. Readers will be captivated anew by the One we call Lord.
True and absolute freedom is only found in the presence of God."--A.W. Tozer Deep in the soul of every person on earth is a longing for the presence of God. But how do we get there? Experiencing the Presence of God is a never-before-published collection of teachings from A.W. Tozer on the book of Hebrews that shows us the way. Tozer, the renowned pastor and theologian, challenges our status quo, invites us to explore a fresh understanding of what it means to dwell in God's presence, and leads us to experience the divine fulfillment for which we were created! As Tozer says, "We should come to church not anticipating entertainment but expecting the high and holy manifestation of God's presence. . . . Worship is not some performance we do, but a presence we experience." Come alongside Tozer and enter into God's presence right now.
The word faith is common these days, but placing one's faith in God is a weighty action, uncommonly fraught with consequence and, by His design, inconvenience. Faith in God is reassuring and comforting only insofar as believers trust Him--and that depth of trust is the mark of a mature Christian who has allowed faith to intrude on his life and shift his gaze away from his own aims, needs, and desires. This is nothing if not a painful and disturbing process. A Disruptive Faith is A.W. Tozer's never-before-published teaching on what he termed "faith that perturbs"--faith that contradicts the unbelieving man and threatens the complacency of the Christian. The renowned pastor and teacher insists in these pages that genuine faith breeds dissatisfaction with this life, by God's design; it weans us from this temporary life and prepares us for the life to come. Readers will learn to be content with this faith-inspired discontent and to experience a fresh hope for eternity with God.
God's Word and God's Spirit Lead You to Experience God's Presence "Get on your knees with an outspread Bible," A.W. Tozer challenged his congregation, "and linger in the presence of God." Much has been claimed about the Bible that has obscured the true significance of Scripture for the Christian's life. But now, this never-before-published teaching from renowned preacher and theologian A.W. Tozer brings clarity where there has been confusion. Can we trust the Bible? What is Scripture for? According to Tozer, the Holy Spirit operates through the written Word of God to move believers into an ever deeper experience of God's presence. God's Power for Your Life is more than information about the Bible, however; this book is a guide for experiencing fellowship with the Father through His Word. Discover all the Bible is meant to be for your life with God.
If the messages in this book were read and acted upon by every pastor and church member, we would have the revival for which Dr. Tozer fervently prayed, and for which many of us are praying today." — Warren Wiersbe "The church should be a healthy, fruitful vineyard that will bring honor to Christ," says A. W. Tozer. But to do so, we as individuals must stop accepting the status quo and get out of our spiritual ruts. In Rut, Rot, or Revival, Tozer describes the signs of being in a spiritual rut, the reasons we get into them, how to get out, and, most importantly, why we need to get out now.
What Does it Mean to Be "Crucified With Christ?" During his lifetime, renowned teacher A.W. Tozer was often invited to speak at seminaries, churches, and Bible conferences on the topic of the cross and its meaning for the Christian life. Now, in this never-before-published distillation of his best teaching on the subject, you will gain a fresh understanding of the cross's centrality to your walk of faith in Christ. The apostle Paul declared in his letter to the Galatians that he had been "crucified with Christ." But what does this mean? Is this a claim every believer can and should make? The Crucified Life is a comprehensive examination of these questions, answered with the deep, biblical thinking for which Tozer was revered. "God is ingenious in developing crosses for His followers," Tozer was fond of saying. At the heart of this book, you will find a call to follow Christ to the cross and be raised to new life--a call to live the crucified life.
Viewed by his contemporaries as a preacher and writer with a prophetic edge, Tozer had a powerful effect on people. James Snyder has done a masterful job of selecting and transcribing sermons from his private collection of rare recordings, and has also captured Tozer, the man, in a biography laced with anecdotes and personal material that only a seasoned researcher could find.
The one great obsession of A.W. Tozer's life was worship. Many have written about worship, but Tozer surpassed them all in simple passion and supreme purpose. Compiled from material never before published, this book presents A.W. Tozer's systematic teaching on worship. His thoughts on the subject were deeply rooted in biblical doctrine and historic writings, blending Scripture with some of the great devotional writers throughout history. Be inspired to not only understand worship but also experience it in your own heart. This will be the best teaching in my ministry. I want to deliver my soul as a prophet of God to the people, and to explain why we were created and why we are here, not to the satisfaction of the needed appetite only but to something bigger, grander and more eternal, that we might worship God and enjoy Him forever.
In today's world of shallow pursuits, surface-level social media, and frivolous vanities, too many Christians are distracted from what really counts: a passionate pursuit of Christ. Because of that, the enemy controls us, keeping us and the Church at large from being everything God wants us to be. In this never-before-published compilation of teachings, A.W. Tozer dives deep into a favorite topic: growing in Christ. With passion and biblical wisdom he equips you to · ignite a true desire for Christ · overcome hindrances to your Christian development · implement life-giving disciplines · grow in the grace and knowledge of Christ The deeper you mature in Christ, the less this shallow world can ensnare you. And the more you--and the Church--will truly flourish.
A.W. Tozer on Living in God's Wisdom We were created by God and for God, and the only way to find true joy, peace, and contentment is by understanding and embracing his wisdom. Wisdom is not some highbrow philosophical concept, but rather a highly practical tool for living the best possible life. The Wisdom of God captures Tozer's teaching on this topic as a way to understand the well-lived Christian life. God's wisdom is a part of his character, inseparable from his love and grace, and knowing this wisdom means drawing closer to him. It will change your decisions, attitudes, and relationships, setting you on the path to becoming all God wants you to be.
Many modern Christians are familiar with the name, and perhaps even some of the writings of, A. W. Tozer, but few living today were blessed to sit under his weekly teaching from the pulpit. In this never-before published collection of teachings on 1 Peter, adapted from sermons given to his parishioners, Tozer examines what it means to call oneself a “Christian.” In his view, to be a recipient of God’s salvation is to become “the pride of all heaven,” indestructible and able to withstand anything and everything that seeks to undermine one’s faith. The epistle of 1 Peter was written to a group of just such Christians, to encourage them to live in the center of God’s redeeming love. Through Tozer’s incomparable teaching and commentary, this ancient letter becomes a fresh and life-infusing admonition for today’s Christian!
Many people believe in God and believe that God is everywhere, but they have yet to experience his presence. What did it mean for Moses to encounter God at the burning bush? How did it change his life and his perception of God? What is keeping you from experiencing his presence in your life? It was in that burning bush experience that Moses began to understand and appreciate the sacredness of worship. Through this book, Tozer teaches how proper worship has to be equal to the one we are worshiping, so if we are worshiping God, we must do it on his terms. This means having a spirit of reverence and holiness--like Moses taking off his shoes and kneeling before him. The bush's fire did not frighten Moses, but rather it poured the essence of sacredness into his life, giving him an experience he had never had before. Let this book teach you how, like Moses, to kneel and worship before God's holy fire.
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