منابع مشابه
Huygens's wave propagation principle corrected.
Huygens's principle that each point on a wave front represents a source of spherical waves is conceptually useful but is incomplete; the backward parts of the wavelets have to be neglected ad hoc, otherwise backward waves are generated. The problem is solved mathematically by Kirchhoff's rigorous integration of the wave equation, but the intuitive appeal of Huygens's simple principle is lost. I...
متن کاملThe ππ S - wave scattering lengths July 24 , 2000
We match the known chiral perturbation theory representation of the ππ scattering amplitude to two loops with a phenomenological description that relies on the Roy equations. On this basis, the corrections to Wein-berg's low energy theorems for the S-wave scattering lengths are worked out to second order in the expansion in powers of the quark masses. The resulting predictions, a 0 0 = 0.220 ± ...
متن کاملThe ππ S - wave scattering lengths July 11 , 2000
We match the known chiral perturbation theory representation of the ππ scattering amplitude to two loops with a phenomenological description that relies on the Roy equations. On this basis, the corrections to Wein-berg's low energy theorems for the S-wave scattering lengths are worked out to second order in the expansion in powers of the quark masses. The resulting predictions, a 0 0 = 0.220 ± ...
متن کاملs - wave scattering lengths of the strongly dipolar bosons
Yijun Tang,1,2 Andrew Sykes,3 Nathaniel Q. Burdick,2,4 John L. Bohn,3 and Benjamin L. Lev1,2,4 1Department of Physics, Stanford University, Stanford, California 94305, USA 2E. L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA 3JILA, University of Colorado and National Institute of Standards and Technology, Boulder, Colorado 80309, USA 4Department of Applied Physics, St...
متن کاملMAD phasing with krypton.
Experiments demonstrating the feasibility of Kr-edge MAD on frozen crystals as a routine method for structure determination are reported. Approximately 50% of protein crystals can be successfully derivatized by pressurization with the noble gases xenon or krypton. While Xe has produced many useful derivatives for MIR phasing over the last several years, the Xe edges (K edge = 34.6 keV, L(I) = 5...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nature
سال: 1950
ISSN: 0028-0836,1476-4687
DOI: 10.1038/165187a0