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排序方式: 共有218条查询结果,搜索用时 15 毫秒
21.
22.
Constantine A. Kagarakis 《Molecular physics》2013,111(6):1485-1488
The spectrum of a partially oriented sample of ethanol has been analysed by making use of the simpler spectra obtained from the species CD3CH2OH and CH3CD2OH, together with 1H?{2H} double resonance. With p-ethoxy-benzylidene-p-n-butylaniline (EBBA) as the nematic solvent the dipolar couplings of CH3 and CH2 protons with the OH proton can be observed, and their magnitudes are compared with values calculated assuming different models for C-O-H internal rotation. Information on the quadrupole coupling constant tensor elements for CD3 and CD2 deuterium nuclei is obtained. 相似文献
23.
This paper presents a perturbation theory for the double sine-Gordon equation. We obtain a system of differential equations that shows the soliton parameters modification under the influence of the perturbation. For the particular case λ=0 the results transform into the well-known perturbation theory for the sine-Gordon equation. 相似文献
24.
Constantine M. Dafermos 《Ricerche di matematica》2006,55(1):79-92
Abstract The paper employs the method of characteristics to show that continuous solutions of scalar conservation laws do not incur
entropy production and to recover, in a direct and elementary way the (known) properties of solutions to the Hunter-Saxton
equation.
Keywords: Balance laws, Characteristics, Hunter-Saxton equation
Mathematics Subject Classification (2000): 35L65, 35Q58 相似文献
25.
Constantine Sandis 《Acta Analytica》2006,21(2):30-40
This paper aims to explore the space of possible particularistic approaches to Philosophy of Science by examining the differences
and similarities between Jonathan Dancy’s moral particularism—as expressed in both his earlier writings (e.g., Moral Reasons, 1993), and, more explicitly defended in his book Ethics without Principles (2004)—and Nancy Cartwright’s particularism in the philosophy of science, as defended in her early collection of essays,
How the Laws of Physics Lie (1983), and her later book, The Dappled World: A Study of the Boundaries of Science (1999). I shall argue that Dancy’s particularism is more radical, but also more plausible, than Cartwright’s, concluding
that we have good reason to embrace a scientific particularism that is far closer to Dancy’s ethical particularism than any
view defended by Nancy Cartwright, or any other philosopher from the ‘Stanford school’ of scientific theory. 相似文献
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27.
The conduction electron field-induced magnetic form factor of Lu, a rare earth metal with a closed 4f shell, has been measured using the polarized neutron technique. The measurements demonstrate that the conduction electron density is more spatially extended than in the free atom. The experimental results are in good agreement with band calculations of the magnetic form factor. 相似文献
28.
Constantine Mavroyannis 《Zeitschrift für Physik B Condensed Matter》1995,99(1):429-434
We consider the excitation spectra of a bichromatically driven three-level atom in the lambda configuration and in the low-frequency
domain. These dynamically induced spectra occur when the excitation fields operate at low intensities and are neither one-
nor two-photon resonant with the various transitions of the system. 相似文献
29.
Constantine Mavroyannis 《Physica A》1980,102(1):193-200
The two-photon resonance fluorescence spectrum of a three-level atom is shown to consist of the low frequency modes in addition to the high frequency ones in the limit of high photon densities. The spectral function for the low frequency modes consists of two lorentzian lines describing: the peak occuring at the renormalized beat frequency Δ+ and that of the zero-photon excitation at the frequency Δ-, where Δ±=Δ-3Ω2/2ωa±Ω2u/2ωa, u2=1+(2Δωa/Ω 2)2. Here, 2Δ is the energy splitting between the two excited states, ωa is the photon energy of the pump field and Ω is the Rabi frequency. The peak at the renormalized beat frequency Δ+ occurs provided that the condition (2Δωa/Ω2)2 > 1 is satisfied. The two-photon laser spectroscopy is expected to be a useful tool for the observation of the low frequency modes in question. 相似文献
30.