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История развития двигателей внутреннего сгорания
История развития двигателей внутреннего сгорания
ДВС Двигатель внутреннего сгорания (ДВС) – тепловой двигатель, в котором химическая энергия топлива, сгорающего в рабочей полости, преобразуется в механическую работу. Внутренней энергией обладают все тела – земля, камни, облака. Однако извлечь их внутреннюю энергию довольно трудно, а порой и невозможно. Наиболее легко на нужды человека может быть использована внутренняя энергия лишь некоторых, образно говоря, "горючих" и "горячих" тел. К ним относятся: нефть, уголь, горячие источники вблизи вулканов, теплые морские течения и т.п. Применение двигателей внутреннего сгорания чрезвычайно разнообразно: они приводят в движение самолеты, теплоходы, автомобили, тракторы, тепловозы. Мощные двигатели внутреннего сгорания устанавливают на речных и морских судах.
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Higher education traditions in the USA
Higher education traditions in the USA
Higher education in the United States includes a variety of institutions of higher education. Strong research and funding have helped make United States colleges and universities among the world's most prestigious, making them particularly attractive to international students, professors and researchers in the pursuit of academic excellence. According to the Shanghai Jiao Tong University's Academic Ranking of World Universities, more than 30 of the highest-ranked 45 institutions are in the United States. Public universities, private universities, liberal arts colleges, and community colleges all have a significant role in higher education in the United States. Higher education in the United States includes a variety of institutions of higher education. Strong research and funding have helped make United States colleges and universities among the world's most prestigious, making them particularly attractive to international students, professors and researchers in the pursuit of academic excellence. According to the Shanghai Jiao Tong University's Academic Ranking of World Universities, more than 30 of the highest-ranked 45 institutions are in the United States. Public universities, private universities, liberal arts colleges, and community colleges all have a significant role in higher education in the United States. Colleges and universities in the U.S. vary in terms of goals: some may emphasize a vocational, business, engineering, or technical curriculum while others may emphasize a liberal arts curriculum. Many combine some or all of the above. Colleges and universities in the U.S. vary in terms of goals: some may emphasize a vocational, business, engineering, or technical curriculum while others may emphasize a liberal arts curriculum. Many combine some or all of the above.
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