Professor Kun Huang is widely known for his collaboration with Max Born in writing the classic monograph, ?Dynamical Theory of Crystal Lattices?. During his years of active research, he has made many important contributions to solid state physics. The present collection of papers is selected at his own choice as representing his most influential works. Thus one finds included his pioneering work on the interaction of radiation field with polar lattices and the resulting coupled vibration modes (later known as ?polariton?); the systematic development of his theory of radiative and nonradiative multiphonon transition processes associated with lattice relaxation; his early prediction of diffuse X-ray scattering due to crystal defects; and his recent research works on low-dimensional semiconductor structures, etc.Professor Huang has found by his experience that scientists interested in these papers often want to know more particulars underlying the research work (background, motivation and rationale involved etc.). Thus he was led to write a commentary which is published alongside the papers.
A gyrotron traveling-wave amplifier (gyro-TWT) with the high-power and broad-band capabilities is considered as a turn-on key for next generation high-resolution radar. The book presents the most advanced theory, methods and physics in a gyro-TWT. The most challenging problem of instability competition has been for the first time addressed in a focused and systematic way and reported via concise states and vivid pictures. The book is likely to meet the interest of researchers and engineers in radar and microwave technology, who would like to study the gyro-TWTs and to promote its application in millimeter-wave radars. Chao-Hai Du and Pu-Kun Liu are both professors at Peking University.
He was unbridled as he slashed his sword through the heavens!He exuded an evil aura, and his eyes flashed like lightning across the nine heavens.He was free and unfettered, with beauties as numerous as the clouds and flowers surrounding him.He was tyrannical, and wherever he passed, not a single blade of grass would remain!Evil Emperor Hengkong, Tremor of Eternity!This was the most powerful, top quality evil cultivator!
The Dharma is the first major collection of teachings by Kalu Rinpoche, a great meditation master in the Tibetan Buddhist tradition. These discourses were presented in America with a Western audience in mind, and have been specially edited for this volume. The openness, simplicity, and depth of realization in his teachings have brought inspiration to many, and greater understanding of the wisdom Buddhism has to offer. The topics covered range from the most subtle psychology and metaphysics to everyday life and practice. Readers new to Buddhism will find lucid and profound explanations of the fundamental teachings; those already familiar with Buddhism will discover unexpected insights into the heart of the tradition.
Growing up across the street from each other, Scott and Cath have been best friends their entire lives. Cath would help Scott with his English homework, he would make her mix tapes (it's the 80's after all), and any fight they had would be forgotten over TV and cookies. But now they've graduated high school and Cath is off to college while Scott is at home pursuing his musical dreams. During their first year apart, Scott and Cath's letters help them understand heartache, annoying roommates, family drama and the pressure to figure out what to do with the rest of their lives. And through it all, they realize that the only person they want to turn to is each other. But does that mean they should be more than friends? The only thing that's clear is that change is an inescapable part of growing up. And the friends who help us navigate it share an unshakable bond. This funny yet deeply moving book--set to an awesome 80's soundtrack--captures all the beautiful confusion and emotional intensity we find on the verge of adulthood...and first love"--
This book systematically presents 40 pests, 7 natural pest enemies, and 20 diseases and weeds commonly encountered in sugarcane production, combining clear colour photos with detailed scientific descriptions. It covers a range of related topics, including morphological identification, habits and frequency of occurrence, prevention and control measures, symptom identification, characteristics of infections and epidemics, parasitic (predator) characteristics, ways of utilising natural pest enemies, main species and distribution, fluctuation in the field, and chemical control of weeds. With novel content presented in simple, straightforward language, the book provides a valuable reference guide for scientific researchers, educators and industrial practitioners, as well as students and advisers at agricultural universities.
We study historical tax revenue downturn episodes—where tax revenue-to-GDP ratios decline sharply—and explore the link between tax revenues and imports. We document that downturn episodes of at least 1 percentage point of GDP in one year are common. The tax types that account for these episodes are different in advanced, emerging and developing, and oil producing countries. We find that tax revenue downturns and import contractions have a statistically significant link. Finally, we show that changes in imports are a statistically significant determinant of changes in tax revenues even when controlling for changes in the output gap and in the terms of trade.
This study systematically investigates the development process, major characteristics and weak links of China's poverty alleviation experience and conducts a comparative analysis of poverty alleviation cases. It also accurately presents the internal logic and core elements of China's poverty alleviation theory and taking the Chinese experience of poverty alleviation refines the "Two Threads One Force" theoretical framework to make a basic judgment of the "China model" for poverty alleviation. It also presents the rationale and plans for responding to new challenges to achieve poverty alleviation goals, which will enhance the welfare of the people and promote social progress and national prosperity.
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