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521.
A. Alberti M. Benaglia M. A. Della Bona M. Guerra A. Hudson D. Macciantelli 《Research on Chemical Intermediates》1996,22(4):381-392
A number of radicals have been added to 1,3-bis(2,4,6-tri-tert-butylphenyl)diphospha-allene at low temperature in cyclopropane solution. Addition of thiyl and alkoxyl radicals occurs regiospecifically to one of the phosphorus atoms leading to new phosphavinyl radicals, isoelectronic with vinyl radicals, which have been characterised by means of EPR spectroscopy. The results of ab initio calculations are in agreement with the experimentally determined spectral parameters and suggest that these radicals are bent, with a PCP bond angle of ca. 150°. In contrast, silyl and germyl radicals appear to add to the carbon atom of the phosphaallene. 相似文献
522.
We apply ideas and methods from classical statistical mechanics to study the P(φ)2 self-coupled two-dimensional Boson field theory in the Euclidean region. In particular, we consider correlation inequalities of Griffiths type; the thermodynamic limit for the pressure, the average interaction and the entropy; and the equilibrium equations for states associated with a given interaction. 相似文献
523.
An analysis of the asymmetric line broadening in the solution electron resonance spectrum of vanadyl tartrate demonstrates that the exchange interaction is positive. The separation between the two vanadyl units is shown to increase slightly when the complex passes from a solid to a fluid solution. 相似文献
524.
Coulomb contributions of multipolarity 2 are calculated for backward (θ = 180°) inelastic electron scattering by our improved DWBA code. General features are studied such as nuclear charge (Z) dependence, energy transfer dependence, momentum transfer dependence as well as the angle dependence near θ = 180°, with the help of a simple model for the transition charge density. We compare these features with PWBA and other simple approximations. We show, as a specific example, that the C2 contribution is comparable to the M1 and E2 multipole form factors for inelastic scattering to the rotational excited states of 181Ta. 相似文献
525.
526.
P. Sarriguren E. Moya de Guerra R. Nojarov 《Zeitschrift für Physik A Hadrons and Nuclei》1997,357(2):143-147
Experimental data on spin M1 strength distributions in even-even rare-earth nuclei are compared to theoretical results of selfconsistent HF+RPA calculations with separable spin-spin residual interactions derived from the two alternative versions (two-body density-dependent and three-body contact terms) of the Skyrme force Sk3. It is shown that the two versions produce quite different spin M1 strength distributions, though they generate the same HF mean field. The experimental data favour the two-body over the three-body version of the Skyrme interactions Sk1–Sk6. 相似文献
527.
From an extrapolation of threshold π+ electroproduction data combined with a kinematical constraint at an unphysical point, we derive the value of the pion form factor at a time-like value of the momentum transfer k2π 1 fm−2. The result is Fπ(k2π) = 1.19 ± 0.1. From this value, using a twice subtracted dispersion relation, we obtain rπ 0.98 ± 0.24 fm. 相似文献
528.
E. P. Guerra 《Rendiconti del Circolo Matematico di Palermo》1976,25(1):xiii-xiv
529.
We have measured quasiinstantaneous transverse patterns in a broad aperture laser. Nonordered patterns yielding to boundary determined regular structures in progressive time-integrated recording are observed. The linear analysis and numerical integration of the full Maxwell-Bloch equations allow us to interpret the features of the experiment. We show that this system being far from threshold cannot be fully understood with a perturbative model. 相似文献
530.
C.J. van Duijn I.A. Guerra M.A. Peletier 《Journal of Mathematical Analysis and Applications》2001,260(2):367
In this paper we consider some asymptotic aspects related to the profile of a reactive solute, which is injected from a well (radius > 0) into a three-dimensional porous medium. We present a convergence result for ↓ 0 as well as the large time behaviour. Regarding the latter we show that the solute profile evolves in a self-similar way towards a stationary distribution and we give an estimate for the rate of the convergence. This paper extends earlier work of C. J. van Duijn and M. A. Peletier (1996, J. Reine Angew. Math.479, 77–98), where the two-dimensional case was treated. 相似文献