American Scientist (May/June 2016)

Review: American Scientist journal is an illustrated bimonthly journal approximately technological know-how and know-how. every one factor is stuffed with characteristic articles written by way of well-known scientists and engineers, reviewing vital paintings in fields that diversity from molecular biology to computing device engineering. The articles are rigorously edited and followed through illustrations which are built to augment the reader's knowing and enjoyment.

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And E. Gaidos. 2011. Hydrogen greenhouse planets past the liveable sector. Astrophysical magazine Letters 734:L13. Seager, S. , W. Bains, and R. Hu. 2013. Biosignature gases in H2-dominated atmospheres on rocky exoplanets. Astrophysical magazine 777:95. Wordsworth, R. , and R. Pierrehumbert. 2014. Abiotic oxygen-dominated atmospheres on terrestrial liveable quarter planets. Astrophysical magazine Letters 785:L20. 2016 May–June prior web page | Contents | Zoom in | Zoom out | entrance hide | seek factor | subsequent web page 149 M q M q M q M q MQmags q THE WORLD’S NEWSSTAND® American Scientist earlier web page | Contents | Zoom in | Zoom out | entrance disguise | seek factor | subsequent web page M q M q M q M q MQmags q THE WORLD’S NEWSSTAND® technological know-how & Society photo Library, UDOT, www. trafficsignalmuseum. com, Wikimedia Commons, Photobucket, Matt Weber, ManMadeByDarrellYoung/Alamy, Wikimedia Commons Engineering site visitors indications, predicament Zones, and Red-Light Cameras After nearly a century of analysis, engineers are nonetheless debating the easiest how one can support drivers stream as adequately and successfully as attainable. Henry Petroski T raffic congestion didn't start with the car. previous to the flip of the twentieth century, while horses and wagons by myself crammed the streets of towns, gridlock was once already universal in huge city facilities. Policemen assigned to site visitors accountability at an intersection have been ailing ready to singlehandedly care for the starting to be quantity of horse-drawn cars wishing to go through it. And untangling a logjam of carriages whilst the opera set free used to be a Herculean job. the arrival of the car merely exacerbated the matter. As past due as 1911 there have been few site visitors regulate units within the type of indicators or signs to aid: In a latest ebook of pictures documenting New York’s 5th road block via block, from Washington sq. Park to East Ninety-Third road, there has been now not a site visitors keep watch over equipment to be visible. quickly rudimentary ones started to be invented, in spite of the fact that, and so they proliferated in towns around the state. a few of the earliest site visitors signs resembled railroad semaphores, with fingers classified cease and move, occasionally illuminated for night use. The sign pole used to be usually planted in the course of an intersection and operated manually via a policeman status beside it in the street or in a crow’s nest atop a tower. In 1912 in Salt Lake urban, Utah, Officer Lester F. twine felt Henry Petroski is the Aleksandar S. Vesic Professor of Civil Engineering and a professor of historical past at Duke. His so much lately released publication is the line Taken: The heritage and way forward for America’s Infrastructure (Bloomsbury, 2016). tackle: P. O. field 90287, Durham, NC 27708. one hundred fifty unsecure status one of the site visitors he used to be answerable for directing at a hectic downtown intersection. decided to make his task more secure and more uncomplicated, he reportedly used plywood to construct a tool that appeared a little bit like a birdhouse for giant birds. It had a few 15-centimeter-diameter holes on all of the signaling faces. In every one of those holes was once a gentle bulb that have been dipped in both crimson or eco-friendly paint.

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