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Examining the slave trade between Angola and Brazil, Roquinaldo Ferreira focuses on the cultural ties between the two countries.
One of the greatest unmet challenges in conservation biology is the genetic management of fragmented populations of threatened animal and plant species. More than a million small, isolated, population fragments of threatened species are likely suffering inbreeding depression and loss of evolutionary potential, resulting in elevated extinction risks. Although these effects can often be reversed by re-establishing gene flow between population fragments, managers very rarely do this. On the contrary, genetic methods are used mainly to document genetic differentiation among populations, with most studies concluding that genetically differentiated populations should be managed separately, thereby...
An account of the history and evacuation of the Portuguese merchant ship, Nossa Senhora dos Martires, sunk at the mouth of the Tagus River in 1606.
Como homens, máquinas e dinheiro da primeira república realizaram uma obra memorável e durável. Por trás de todas as dificuldades de um Brasil sem indústrias de base no cenário das ferrovias e pontes estava um engenheiro determinado e empreendedor. A então Natal provinciana, de 1912, já tinha a sua primeira obra emblemática, a Fortaleza da Barra do Rio Grande. Essa viria a ser a segunda. A ponte metálica sobre o rio Potengi ou ponte de Igapó, como ficou conhecida, foi a obra que libertou a cidade em direção ao noroeste da capital e outros estados no ano de 1916. Uma construção bem além da tecnologia brasileira.
This brand new comprehensive text and reference book is designed to cover all the essential elements of food science and technology, including all core aspects of major food science and technology degree programs being taught worldwide. Food Science and Technology, supported by the International Union of Food Science and Technology comprises 21 chapters, carefully written in a user-friendly style by 30 eminent industry experts, teachers and researchers from across the world. All authors are recognised experts in their respective fields, and together represent some of the world’s leading universities and international food science and technology organisations. Expertly drawn together, produ...
This book presents a tutorial review of van der Pol model, a universal oscillator model for the analysis of modern RC−oscillators in weak and strong nonlinear regimes. A detailed analysis of the injection locking in van der Pol oscillators is also presented. The relation between the van der Pol parameters and several circuit implementations in CMOS nanotechnology is given, showing that this theory is very useful in the optimization of oscillator key parameters, such as: frequency, amplitude and phase relationship. The authors discuss three different examples: active coupling RC−oscillators, capacitive coupling RC−oscillators, and two-integrator oscillator working in the sinusoidal regi...