摘要:

The $159 million Comet Nucleus Tour (Contour) spacecraft, which NASA launched in June to rendezvous with three comets, apparently broke into pieces in August. “There was a big problem with firing the solid rocket booster,” says Robert Farquhar, mission director at the Johns Hopkins University Applied Physics Laboratory (APL).

ISSN:0031-9228    

DOI:10.1063/1.1522163

出版商:AIP    

年代:1902

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.2408497

出版商:AIP    

年代:1902

数据来源: AIP

摘要:

Physicists and ecologists approach their crafts from different intellectual traditions, as exemplified by the differing values they attach to the search for simplification and universality. As a particle theorist by training, currently engaged in the study of ecology and global change, I have witnessed dysfunctional consequences of this bimodal legacy. I argue here for a synthesis of what I call the Newtonian and Darwinian approaches to science. Such a synthesis, I believe, offers opportunities for progress at the intersection of physics and ecology, where many critical issues in Earth system science reside.

ISSN:0031-9228    

DOI:10.1063/1.1522164

出版商:AIP    

年代:1902

数据来源: AIP

摘要:

Atomic physics progressed rapidly at the beginning of the last century, thanks, in large part, to optical spectroscopy. Quantization and spin were discovered through optical studies, as were other fundamental atomic properties. With the advent of the laser, physicists learned how to manipulate atomic wavefunctions by applying coherent optical fields. More discoveries followed. Now, at the beginning of the new century, optical techniques are being used to explore a new scientific frontier: the atomlike entities known as quantum dots (Qds).

ISSN:0031-9228    

DOI:10.1063/1.1522165

出版商:AIP    

年代:1902

数据来源: AIP

摘要:

In addition to being a theoretical physicist of the first rank, Eugene Wigner (1902‐95) was the founder of nuclear engineering. He led the group that designed the first very high‐powered nuclear reactors, which were built at Hanford, Washington, for the production of the isotope plutonium‐239.

ISSN:0031-9228    

DOI:10.1063/1.1522166

出版商:AIP    

年代:1902

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.4761831

出版商:AIP    

年代:1902

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.4761832

出版商:AIP    

年代:1902

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.1522169

出版商:AIP    

年代:1902

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.1522172

出版商:AIP    

年代:1902

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.1522173

出版商:AIP    

年代:1902

数据来源: AIP