É o progresso que garante a existência. Sem a engenharia a espécie humana já estaria extinta. O escritor americano James Albert Michener escreveu: “Os cientistas sonham para fazer grandes coisas. Os engenheiros as realizam”. Entre matemática, física, química, técnica e tecnologia, a partir de Arquimedes de Siracusa à Samantha Cristoforetti, de Leonardo da Vinci à Larry Page uma história extraordinária de inovação e conquistas. Nada de quão construido hoje pelo homem em toda a parte do mundo e do espaço teria sido possivel se não tivessem sido os engenheiros. A uma distancia quase de um século depois daquele de Herbert Hoover, nenhum louvor, panegírico, apologia ou adequada celebração literária para os engenheiros. Este elogio quer por isso ser um tributo à profissão mais linda do mundo e aos professionais que todos os dias entre mil dificuldades mas com sabedoria e orgulho a exercitam.
Проектная работа по теме атомного строительства и географической промышленности. Возможна для использования в средних классах и ВУЗ.
Одна из угроз выживанию человечества – космический мусор.Всемогущий Интернет всё больше базируется на спутниках связи, а мимо несутся обломки ракет со скоростью выше разгона болида Формулы-1 в 150 раз. Стремительная сила способна разрушить пристанище всемирной паутины и учинить технологический апокалипсис.Эссе о проблемах ликвидации орбитальных загрязнений и предлагаемом решении – Scavenger.Адресовано школьникам, студентам и преподавателям, как иллюстрированное пособие [space_debris/junk].
This new edition of the definitive arc flash reference guide, fully updated to align with the IEEE's updated hazard calculations An arc flash, an electrical breakdown of the resistance of air resulting in an electric arc, can cause substantial damage, fire, injury, or loss of life. Professionals involved in the design, operation, or maintenance of electric power systems require thorough and up-to-date knowledge of arc flash safety and prevention methods. Arc Flash Hazard Analysis and Mitigation is the most comprehensive reference guide available on all aspects of arc flash hazard calculations, protective current technologies, and worker safety in electrical environments. Detailed chapters cover protective relaying, unit protection systems, arc-resistant equipment, arc flash analyses in DC systems, and many more critical topics. Now in its second edition, this industry-standard resource contains fully revised material throughout, including a new chapter on calculation procedures conforming to the latest IEEE Guide 1584 . Updated methodology and equations are complemented by new practical examples and case studies. Expanded topics include risk assessment, electrode configuration, the impact of system grounding, electrical safety in workplaces, and short-circuit currents. Written by a leading authority with more than three decades' experience conducting power system analyses, this invaluable guide: Provides the latest methodologies for flash arc hazard analysis as well practical mitigation techniques, fully aligned with the updated IEEE Guide for Performing Arc-Flash Hazard Calculations Explores an inclusive range of current technologies and strategies for arc flash mitigation Covers calculations of short-circuits, protective relaying, and varied electrical system configurations in industrial power systems Addresses differential relays, arc flash sensing relays, protective relaying coordination, current transformer operation and saturation, and more Includes review questions and references at the end of each chapter Part of the market-leading IEEE Series on Power Engineering, the second edition of Arc Flash Hazard Analysis and Mitigation remains essential reading for all electrical engineers and consulting engineers.