Frequency Domain Criteria for Absolute Stability focuses on recently-developed methods of delay-integral-quadratic constraints to provide criteria for absolute stability of nonlinear control systems. The known or assumed properties of the system are the basis from which stability criteria are developed. Through these methods, many classical results are naturally extended, particularly to time-periodic but also to nonstationary systems. Mathematical prerequisites including Lebesgue-Stieltjes measures and integration are first explained in an informal style with technically more difficult proofs presented in separate sections that can be omitted without loss of continuity.
The Year without a Purchase is the story of one family s quest to stop shopping and start connecting. Scott Dannemiller and his wife, Gabby, are former missionaries who served in Guatemala. Ten years removed from their vow of simple living, they found themselves on a never-ending treadmill of consumption where each purchase created a desire for more and never led to true satisfaction. The difference between needs and wants had grown very fuzzy, and making that distinction clear again would require drastic action: no nonessential purchases for a whole year. No clothes, no books, no new toys for the kids. If they couldn t eat it or use it up within a year (toilet paper and shampoo, for example), they wouldn t buy it.
Filled with humorous wit, curious statistics, and poignant conclusions, the book examines modern America s spending habits and chronicles the highs and lows of dropping out of our consumer culture. As the family bypasses the checkout line to wrestle with the challenges of gift giving, child rearing, and keeping up with the Joneses, they discover important truths about human nature and the secret to finding true joy. The Year without a Purchase offers valuable food for thought for anyone who has ever wanted to reduce stress by shopping less and living more."
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