ISSN:0031-9228    

DOI:10.1063/1.3022782

出版商:AIP    

年代:1971

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.3022718

出版商:AIP    

年代:1971

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.3022721

出版商:AIP    

年代:1971

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.3022724

出版商:AIP    

年代:1971

数据来源: AIP

摘要:

Every once in a while in discussions about quarks, you hear the old story that Millikan occasionally saw fractional charges while doing his oil‐drop experiment. Now William Fairbank and Arthur Hebard at Stanford University are repeating the experiment, replacing the oil drop with a superconducting niobium ball. They hope to improve the chance of finding a fractional charge because the probability of finding such a charge is proportional to the mass of the sphere. Their sphere has a mass of7×10−5 grams,in contrast to a typical Millikan oil drop of3×10−11 grams.

ISSN:0031-9228    

DOI:10.1063/1.3022726

出版商:AIP    

年代:1971

数据来源: AIP

摘要:

With a modest extension the Batavia accelerator may be able to produce 1000‐GeV protons, double the expected 500‐GeV maximum, according to National Accelerator Laboratory director Robert R. Wilson. On 9 March Wilson told the Joint Congressional Committee on Atomic Energy how a relatively inexpensive device ($10–20 million) consisting of small‐bore superconducting magnets could act as an “energy doubler” that would pay for itself within the first few years of operation.

ISSN:0031-9228    

DOI:10.1063/1.3022727

出版商:AIP    

年代:1971

数据来源: AIP

摘要:

Atop the extinct volcano, Mauna Kea, 13 600 feet high, the University of Hawaii's new 88‐inch reflector telescope is now operating. The instrument was manufactured by the Boller and Chivens division of Perkin‐Elmer Corp. Two 24‐inch telescopes are also located in the laboratory.

ISSN:0031-9228    

DOI:10.1063/1.3022729

出版商:AIP    

年代:1971

数据来源: AIP

摘要:

Last fall I had the honor of speaking at the dedication of a new physics building on the University of California campus at Santa Barbara. As I arrived for the occasion, it struck me how lucky the physicists at Santa Barbara are to be living and working in such a glorious place. The day was clear and I could see the mountains, which contain the surviving frayed specimens of the majestic California condor, and the channel, with the islands on the other side. I had been sailing in the channel and had seen it sometimes sparkling in the sunlight, sometimes shrouded with fog, full of dolphins and sea lions. The campus is built on what used to be my favorite bird‐watching place in Southern California, with its curlews, godwits, and phalaropes. Now, for the males of our species, it is a favorite girl‐watching place. In any case it is bustling with young Californians presumably seeking knowledge and wisdom, and some older people who are supposed to be able to impart such things.

ISSN:0031-9228    

DOI:10.1063/1.3022730

出版商:AIP    

年代:1971

数据来源: AIP

摘要:

“Potential” is the word that first comes to my mind in thinking about the field of amorphous semiconductors. The field is potentially very large because of the wide range of phenomena and materials it encompasses. The phenomena lend themselves to a multitude of potential technological applications (see box). What I am concerned with here, however, is the challenge offered by amorphous semiconductors to our theoretical understanding.

ISSN:0031-9228    

DOI:10.1063/1.3022731

出版商:AIP    

年代:1971

数据来源: AIP

摘要:

The gravitational proportionality constantG, although one of the first constants measured and perhaps the most fundamental and universal constant in Nature, is now the least accurately known.G, which relates the forceFbetween two particles to their massesm1andm2and the distancedbetween themF = −Gm1m2/d2is now known only with an accuracy of about one half of one percent. Because many contemporary techniques, such as in geophysics, require a good knowledge ofG, as well as for purely theoretical interests, a group of us at the University of Virginia, Charlottesville, have been developing the apparatus shown in figure 1 to measure the absolute value ofGas well as its possible variation with time or other factors.

ISSN:0031-9228    

DOI:10.1063/1.3022732

出版商:AIP    

年代:1971

数据来源: AIP