Despite problems of pollution that developed later, the introduction of DDT as a highly effective insecticide in was a particularly significant achievement of chemical technology.
Once again, World War II gave a powerful boost to development. Petroleum As far as fuel is concerned, the gas turbine burns mainly the middle fractions kerosene, or paraffin of refined oil, but the general tendency of its widespread application was to increase still further the dependence of the industrialized nations on the producers of crude oilwhich became a raw material of immense economic value and international political significance.
Luna 2 crashed on the Moon on Sept. Most especially, this conversion has made possible the construction of much more powerful computers while making them more compact and less expensive. Emphasis now is placed on electronic detection and the support of nuclear-powered submarines equipped with missiles carrying nuclear warheads.
In the s the first mobile phones were invented. The construction of large-span bridges received a setback, however, with the dramatic collapse of the Tacoma Narrows Washington Suspension Bridge in the United States infour months after it was completed.
The vital ingredients for the new tall buildings or skyscrapers that followed were abundant cheap steel—for columns, beams, and trusses—and efficient passenger elevators. In the construction of housing units, often in large blocks of apartments or flats, such systems are particularly relevant because they make for standardization and economy in plumbing, heating, and kitchen equipment.
The emergence of television as a universal medium of mass communication is therefore a phenomenon of the postwar years. All these pharmaceutical advances demonstrate an intimate relationship with chemical technology.
Synthetic fertilizersan important product of the chemical industry, became popular in most types of farmingand other chemicals—pesticides and herbicides—appeared toward the end of the period, effecting something of an agrarian revolution.
The first such material to be manufactured was Parkesinedeveloped by the British inventor Alexander Parkes. The revolution in home equipment that began before World War II has continued apace since, with a proliferation of electrical equipment. And as late as the 18th century, the French philosopher Montesquieu wrote that any man who was in love with his wife was probably too dull to be loved by another woman.
Only in its final stages did even this program become a matter of technology, when the problems of building large reactors and handling radioactive materials had to be solved. Glass fibre has been molded in rigid shapes to provide motorcar bodies and hulls for small ships.
In the process it assured technology, for the first time in its long history, a position of importance and even honour in social esteem. The airplane is entirely a product of the 20th century, unlike the automobile, to which its development was intimately related.
These drugs work by preventing the growth of pathogenic organisms. In the so-called ramjet engine, intended to operate at high speeds, the momentum of the engine through the air achieves adequate compression. The impact of technology on the future of work is uncertain.
Such forces were deployed in wars in Korea and Vietnam, the latter of which also saw the widespread use of napalm bombs and chemical defoliants to remove the cover provided by dense forests. The demand for iron and its alloys and for the nonferrous metals has remained high.
Apart from improvements in the design of the stills and the introduction of continuous-flow production, the first big advance came in with the introduction of thermal cracking. One weapon developed during World War II deserves a special mention. Bakelite is made by the reaction between formaldehyde and phenolic materials at high temperatures; the substance is hard, infusible, and chemically resistant the type known as thermosetting plastic.
The high-compression engine burning heavy-oil fuels, invented by Rudolf Diesel in the s, was developed to serve as a submarine power unit in World War I and was subsequently adapted to heavy road haulage duties and to agricultural tractors.
The feat precipitated the so-called space race, in which achievements followed each other in rapid succession. But it was only in the 16th century that the church decreed that weddings be performed in public, by a priest, and before witnesses.
The years to were dominated by the two World Wars, while those since were preoccupied by the need to avoid another major war. Coalition troops remain in the country to install a democratic government and fight an escalating insurgency. By the beginning of the 20th century, significant amounts of magnesium were being prepared electrolytically at high temperatures, and the electric furnace made possible the production of calcium carbide by the reaction of calcium oxide lime and carbon coke.
Severe human rights violations continue to be reported. This specialty issue of Newsweek focuses on how an explosion of discoveries changed our lives in the 20th century.
Readers can examine various articles that discuss how inventions have affected how we work, how we live, how we fight and how we heal. This specialty issue of Newsweek focuses on how an explosion of discoveries changed our lives in the 20th century.
Readers can examine various articles that discuss how inventions have affected how we work, how we live, how we fight and how we heal. The effect of digital technology on late 20th century and early 21st century culture Jennifer, Clarke "The effect of digital technology on late 20th century and early 21st century culture" ().
Graduate Theses and Dissertations. Those who create within the affected art form, whether they choose to work. "Our theory is that when we moved to this super-hygiene environment, which only occurred in the last 50 to years, this led to immune disregulation," Weinstock told Live Science in a Since the ancient world, marriage has evolved from a preservation of power to a personal contract between two equals seeking love, stability, and happiness.
Jul 26, · A transcript follows. A professor at the Peabody Conservatory in Baltimore, Md., Mark Katz teaches courses on 20th-century classical and popular .Technology in the 20th century affected our expectations of how we live today