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Given a regular –-hermitian form on an n-dimensional vector space V over a commutative field K of characteristic 2 (
). Call an element of the unitary group a quasi-involution if is a product of commuting quasi-symmetries (a quasi-symmetry is a unitary transformation with a regular (n–1)-dimensional fixed space). In the special case of an orthogonal group every quasi-involution is an involution. Result: every unitary element is a product of five quasi-involutions. If K is algebraically closed then three quasi-involutions suffice. 相似文献
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G. N. Birich Yu. V. Bogdanov S. I. Kanorskii I. I. Sobelman V. N. Sorokin I. I. Struk E. A. Yukov 《Journal of Russian Laser Research》1994,15(6):455-476
A procedure for precision measurements of small angle rotation of light polarization plane vs wavelength is described. Analyzed
at length is the optical spectropolarimeter configuration, wherein the frequency-dependent instrumental rotations are suppressed
to the maximum degree. The sensitivity and the accuracy of the technique are illustrated by the examples of measuring the
optical activity of atomic bismuth caused by parity nonconservation and the spectral profiles of the Faraday rotation.
Translated from Trudy Fizicheskogo Instituta im. P. N. Lebedeva, Lebedev Physics Institute, Russian Academy of Sciences, Moscow,
Vol. 195, pp. 195–216, 1989. 相似文献
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Yu. V. Bogdanov S. I. Kanorskii A. A. Papchenko I. I. Sobelman V. N. Sorokin I. I. Struk E. A. Yukov 《Journal of Russian Laser Research》1994,15(6):477-492
The constants of pressure self-broadening of cesium have been measured for the transitions 6P
1/2−8D
3/2, 6P
3/2−10S
1/2, and 5D
5/2−nF(n=14−19). The constants of the resonance broadening of the 6P
1/2 and 6P
3/2 cesium levels, the constants of electron collisional broadening of thenF levels at a temperature ofT≈1500 K, and the oscillator strengths of the 5D
5/2−nF(n=14−18) transitions have been determined.
Translated from Trudy Fizicheskogo Instituta im. P. N. Lebedeva, Lebedev Physics Institute, Russian Academy of Sciences, Moscow,
Vol. 195, pp. 217–233, 1989. 相似文献
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Joanne H Gibson Barry Slobedman Harikrishnan KN Sarah L Williamson Dimitri Minchenko Assam El-Osta Joshua L Stern John Christodoulou 《BMC neuroscience》2010,11(1):53
Background
The Rett Syndrome (RTT) brain displays regional histopathology and volumetric reduction, with frontal cortex showing such abnormalities, whereas the occipital cortex is relatively less affected. 相似文献18.
The paper presents the results of numerical analyses of optical structures realized in the form of planar waveguides made of materials with high values of the refractive index n ??1.85. The analysed structures consist of a waveguide and input-output systems. Input-output couplers are realized in the form of prisms as well as Bragg??s grating couplers. Numerical investigations were carried out by applying the finite difference time domain (FDTD) method. 相似文献
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