ISSN:0031-9228    

DOI:10.1063/1.2807826

出版商:AIP    

年代:1996

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.2807793

出版商:AIP    

年代:1996

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.2807794

出版商:AIP    

年代:1996

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.2807795

出版商:AIP    

年代:1996

数据来源: AIP

摘要:

Whatever causes superconductivity above 40 K, it seems to involve the layers containing copper and oxygen atoms, which are common to all compounds exhibiting a high critical temperature,Tc.Hoping to gain insight into the mechanism for superconductivity in these complex structures, some theorists have looked at systems as simple as one‐dimensional chains of copper and oxygen atoms. More recently they have turned to copper oxide ladders—that is, pairs of copper oxide chains linked by additional oxygen atoms between the coppers. So far, the theorists have predicted a number of physical properties of such ladders, including the possibility that the ladders can go superconducting.

ISSN:0031-9228    

DOI:10.1063/1.2807796

出版商:AIP    

年代:1996

数据来源: AIP

摘要:

Charge ordering in aLa0.33Ca0.67MnO3lattice can be seen as regularly spaced stripes in this low‐temperature high‐resolution (0.5‐nm) electron micrograph made by Cheng Hsuan Chen and Sang‐Wook Cheong of Bell Laboratories, Lucent Technologies. In the strategically placed inset at the upper left, charge ordering is evidenced by the smallest stars in the electron diffraction pattern.

ISSN:0031-9228    

DOI:10.1063/1.2807797

出版商:AIP    

年代:1996

数据来源: AIP

摘要:

Following the excitement generated by the Galileo spacecraft's first Ganymede flyby on 27 June, researchers are hoping that data from the 6 September encore performance—which skimmed within 262 km of that Jovian moon—will help them understand why Ganymede is more tectonically and magnetically active than expected. The data trickling back to Earth during the next two months is expected to include the best images yet obtained (some stereoscopic) of Jupiter's and the Solar System's largest moon.

ISSN:0031-9228    

DOI:10.1063/1.2807798

出版商:AIP    

年代:1996

数据来源: AIP

摘要:

Fifty years ago, a physics graduate student burning the midnight oil might labor for several years with a lab notebook, Marchant desk calculator and graph paper. Today the time it takes to receive the PhD might be even longer, but today's tools were probably never dreamt of by that struggling student of the past.

ISSN:0031-9228    

DOI:10.1063/1.881525

出版商:AIP    

年代:1996

数据来源: AIP

摘要:

By any measure, society—US society in particular—is now in some phase of what is being called the information revolution. This “third wave,” a term introduced by Alvin Toffler, follows the industrial revolution of the 18th century and the agricultural revolution of 10 000 years ago, and is resulting in phenomenal social, cultural and economic transformations. It is changing the ways in which people spend their time at work and at play, and the ways in which they live their lives in general. Inevitably, it will lead to major geopolitical upheavals. This revolution, as were the two previous ones, is technology based, with the seeds being planted over a long period.

ISSN:0031-9228    

DOI:10.1063/1.881522

出版商:AIP    

年代:1996

数据来源: AIP

摘要:

In the 50 years since the ENIAC (Electronic Numerical Integrator and Computer) was publicly announced at the Moore School of Electrical Engineering at the University of Pennsylvania, computers have transformed the natural sciences and even become the subject of their own science. Designed to be a tool of Mars rather than Minerva, the ENIAC was finished too late to be of use for its intended purpose of calculating ballistic tables in World War II. It was initially applied instead to the “Los Alamos problem,” a calculation of the behavior of Edward Teller's thermonuclear weapon design, known as the “Super.” However, after the formation of the Atomic Energy Commission (AEC) in 1946. Los Alamos and the other AEC laboratories actively developed computers and applied them to a wide variety of physical problems in a fruitful partnership with industry and academia.

ISSN:0031-9228    

DOI:10.1063/1.881599

出版商:AIP    

年代:1996

数据来源: AIP