منابع مشابه
The bright spark who lit up Glasgow.
Pressure on doctors to keep up with technology can be a pain, but it’s nothing new. For John Macintyre, it was not just a pleasure but an all consuming passion. Macintyre had an astonishingly inventive mind, making some of the earliest sound recordings of the great singers and actors of the late Victorian era. He had humble origins, born the son of a tailor in Glasgow’s High Street in 1857. He ...
متن کاملthe study of bright and surface discrete cavity solitons dynamics in saturable nonlinear media
امروزه سالیتون ها بعنوان امواج جایگزیده ای که تحت شرایط خاص بدون تغییر شکل در محیط منتشر می-شوند، زمینه مطالعات گسترده ای در حوزه اپتیک غیرخطی هستند. در این راستا توجه به پدیده پراش گسسته، که بعنوان عامل پهن شدگی باریکه نوری در آرایه ای از موجبرهای جفت شده، ظاهر می گردد، ضروری است، زیرا سالیتون های گسسته از خنثی شدن پراش گسسته در این سیستم ها بوسیله عوامل غیرخطی بوجود می آیند. گسستگی سیستم عامل...
Drawing a spark from darkness: John Walsh and electric fish.
John Walsh's research on electric fish, carried out between 1772 and 1775, proved fundamental for demonstrating that electricity might be involved in animal physiology, and, moreover, in favouring a period of great progress in both the physiology and physics of electrical phenomena. However, Walsh is hardly known to modern neuroscientists and is largely neglected by science historians also. One...
متن کاملthe effect of taftan pozzolan on the compressive strength of concrete in the environmental conditions of oman sea (chabahar port)
cement is an essential ingredient in the concrete buildings. for production of cement considerable amount of fossil fuel and electrical energy is consumed. on the other hand for generating one tone of portland cement, nearly one ton of carbon dioxide is released. it shows that 7 percent of the total released carbon dioxide in the world relates to the cement industry. considering ecological issu...
Influence of the laser spark generation mechanism on electric and magnetic fields in its vicinity
A laser spark formed by the focused beam of a ns high energy laser in a gas filled interaction chamber can mimic energetic events in the early Earth atmosphere, which are thought to be instrumental in the synthesis of simple chemical compounds, such as some amino acides, [1, 2], which later might have participated in more complex organic syntheses leading to the origin of terrestrial life. Some...
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ژورنال
عنوان ژورنال: Nature
سال: 1991
ISSN: 0028-0836,1476-4687
DOI: 10.1038/352119a0