Найти книгу: "Locked In, Locked Out"

In November 1993, the largest public housing project in the Puerto Rican city of Ponce—the second largest public housing authority in the U.S. federal system—became a gated community. Once the exclusive privilege of the city's affluent residents, gates now not only locked «undesirables» out but also shut them in. Ubiquitous and inescapable, gates continue to dominate present-day Ponce, delineating space within government and commercial buildings, schools, prisons, housing developments, parks, and churches. In Locked In, Locked Out , Zaire Zenit Dinzey-Flores shows how such gates operate as physical and symbolic ways to distribute power, reroute movement, sustain social inequalities, and cement boundary lines of class and race across the city. In its exploration of four communities in Ponce—two private subdivisions and two public housing projects— Locked In, Locked Out offers one of the first ethnographic accounts of gated communities devised by and for the poor. Dinzey-Flores traces the proliferation of gates on the island from Spanish colonial fortresses to the New Deal reform movement of the 1940s and 1950s, demonstrating how urban planning practices have historically contributed to the current trend of community divisions, shrinking public city spaces, and privatizing gardens. Through interviews and participant observation, she argues that gates have transformed the twenty-first-century city by fostering isolation and promoting segregation, ultimately shaping the life chances of people from all economic backgrounds. Relevant and engaging, Locked In, Locked Out reveals how built environments can create a cartography of disadvantage—affecting those on both sides of the wall.

Introducing a new, pioneering approach to integrated circuit design Nanometer Frequency Synthesis Beyond Phase-Locked Loop introduces an innovative new way of looking at frequency that promises to open new frontiers in modern integrated circuit (IC) design. While most books on frequency synthesis deal with the phase-locked loop (PLL), this book focuses on the clock signal. It revisits the concept of frequency, solves longstanding problems in on-chip clock generation, and presents a new time-based information processing approach for future chip design. Beginning with the basics, the book explains how clock signal is used in electronic applications and outlines the shortcomings of conventional frequency synthesis techniques for dealing with clock generation problems. It introduces the breakthrough concept of Time-Average-Frequency, presents the Flying-Adder circuit architecture for the implementation of this approach, and reveals a new circuit device, the Digital-to-Frequency Converter (DFC). Lastly, it builds upon these three key components to explain the use of time rather than level to represent information in signal processing. Provocative, inspiring, and chock-full of ideas for future innovations, the book features: A new way of thinking about the fundamental concept of clock frequency A new circuit architecture for frequency synthesis: the Flying-Adder direct period synthesis A new electronic component: the Digital-to-Frequency Converter A new information processing approach: time-based vs. level-based Examples demonstrating the power of this technology to build better, cheaper, and faster systems Written with the intent of showing readers how to think outside the box, Nanometer Frequency Synthesis Beyond the Phase-Locked Loop is a must-have resource for IC design engineers and researchers as well as anyone who would like to be at the forefront of modern circuit design.

How to acquire the input frequency from an unlocked state A phase locked loop (PLL) by itself cannot become useful until it has acquired the applied signal's frequency. Often, a PLL will never reach frequency acquisition (capture) without explicit assistive circuits. Curiously, few books on PLLs treat the topic of frequency acquisition in any depth or detail. Frequency Acquisition Techniques for Phase Locked Loops offers a no-nonsense treatment that is equally useful for engineers, technicians, and managers. Since mathematical rigor for its own sake can degenerate into intellectual «rigor mortis,» the author introduces readers to the basics and delivers useful information with clear language and minimal mathematics. With most of the approaches having been developed through years of experience, this completely practical guide explores methods for achieving the locked state in a variety of conditions as it examines: Performance limitations of phase/frequency detector–based phase locked loops The quadricorrelator method for both continuous and sampled modes Sawtooth ramp-and-sample phase detector and how its waveform contains frequency error information that can be extracted The benefits of a self-sweeping, self-extinguishing topology Sweep methods using quadrature mixer-based lock detection The use of digital implementations versus analog Frequency Acquisition Techniques for Phase Locked Loops is an important resource for RF/microwave engineers, in particular, circuit designers; practicing electronics engineers involved in frequency synthesis, phase locked loops, carrier or clock recovery loops, radio-frequency integrated circuit design, and aerospace electronics; and managers wanting to understand the technology of phase locked loops and frequency acquisition assistance techniques or jitter attenuating loops. Errata can be found by visiting the Book Support Site at: http://booksupport.wiley.com

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