Word: electronics
(lookup in dictionary)
(lookup stats)
Dates: during 1960-1969
Sort By: most recent first
(reverse)
...bullets" it fires are so small and so light that they can be deflected by a single molecule of air. Even so, the new electron gun devised by Westinghouse Physicist Berthold Schumacher packs so much power that it can shoot its way through the world's hardest rock. It points the way for cheap and relatively simple tools for quarrying stone, mining minerals or even carving tunnels through mountains...
Schumacher obtains his electron projectiles by boiling them off a heated metal cathode. High-power electrical fields focus them into a narrow beam and boost them up to tremendous speeds - in much the same manner as electron beams are generated inside a TV picture tube. But Schumacher's gun has a special capability: its electron beam maintains its focus and power for a short distance after it squirts out of the gun barrel and into the atmosphere. In earlier experimental cutters the beam lost its power almost immediately in collisions with air molecules; the target material...
Heart of the starlight scope is its image-intensifier tube, a sturdy combination of the home TV screen and miniaturized space-age electronics. Focused sharply by the scope's front lens, the slightest flickers of light are directed against a chemical film, causing it to discharge electrons. Boosted along by a 15,000-volt electrostatic field, those electrons smack into a phosphorcoated screen whose light then jars loose still another flock of electrons. The process is repeated three times, and the high-voltage electron acceleration, or energy buildup, produces a progressively brighter image. Besides the light, the only other...
...important element in their electrochemical interactions. Moreover, said Sweden's Dr. Holger Hydén, one big neuron may have on its surface as many as 10,000 points of contact (synaptic knobs) with other neurons (see chart). But by means of exquisitely delicate instrumentation and an electron microscope, Dr. Hydén has discovered that when human neurons are stimulated, some of the millions of ribonucleicacid (RNA) molecules inside them give orders to the glial cells to manufacture new proteins. The nature and pattern of these proteins contain an imprint of something that has been perceived...
...improvements and prospects of further gains, said Dr. Myron P. Nobler, result from the use of modern radiation at supervoltage levels. This may come from a linear accelerator, a large cobalt-60 source, or a generator that puts out 2,000,000 electron volts. To protect the patient from radiation sickness and to spare normal tissue, healthy parts of his body must be shielded. At Memorial Hospital, said Dr. Nobler, an X ray with a grid background is made of the body area involved. On this X ray the radiologists mark the vital organs, such as lungs, which must...