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11.
As laser–plasma interactions access ever-increasing ranges of plasma temperatures and densities, it is interesting to consider
whether they will some day shed light on questions concerning nuclear synthesis. One such open question is the process of
endothermic nuclear synthesis for elements with A > 60, thought to have taken place at a point in time during the big bang, or currently in supernovae. We present an explanation
based on a Boltzmann equilibrium condition, in combination with the change of the Fermi-statistics from the relativistic branch
for hadrons from higher than nuclear densities to the lower density subrelativistic branch. The Debye length confinement of
nuclei breaks down at the relativistic change, thus leading to the impossibility of nucleation of the quark-gluon state at
higher than nuclear densities. Taking the increment for the proton number Z as Z′ = 10 of the measured standard abundance distribution (SAD) of the elements for a Boltzmann probability for heavy element
synthesis, a sequence 3
n
was found with the exponent n for the sequence of the magic numbers. The jump between the magic numbers 20 and 28 does not need then the usual spin-orbit
explanation. 相似文献
12.
Alessandro Morbidelli Massimiliano Guzzo 《Celestial Mechanics and Dynamical Astronomy》1996,65(1-2):107-136
The present paper reviews the Nekhoroshev theorem from the point of view of physicists and astronomers. We point out that Nekhoroshev result is strictly connected with the existence of a specific structure of the phase space, the existence of which can be checked with several numerical tools. This is true also for a degenerate system such as the one describing the motion of an asteroid in the so called main belt. The main difference is that in some parts of the belt, the Nekhoroshev result cannot apply a priori. Mean motion resonances of order smaller than the logarithm of the mass of Jupiter and first order secular resonances must be excluded. In the remaining parts, conversely, the Nekhoroshev theorem can be proved, provided someparameters, such as the masses, the eccentricities and the inclinations of the planets are small enough. At the light of this result, a massive campaign of numerical integrations of real and fictitious asteroids should allow to understand which is the real dynamical structure of the asteroid belt. 相似文献
13.
为有效解决经纬度格网与四元三角网(Quaternary Triangular Mesh,QTM)在全球地形建模方面存在的不足,根据球面DQG(Degenerate Quadtree Grid)的几何结构特点,选择双线性多项式内插方法进行格网点高程内插,给出基于球面DQG的DEM建模算法与效率分析,并应用美国地质调查局提供的GTOPO30全球地形数据进行相关实验。结果表明:全球DEM建模时,DQG所需的格网数是经纬度格网或QTM的2/3左右,且可视化操作(图形放大、缩小及漫游等)时画面平滑、流畅,没有抖动。 相似文献
14.
研究了一类椭圆抛物耦舍方程组解的存在性。在假设耦合系数σ（s）、k（s）∈W^1,m（R）,b∈[L^∞（Ω）]^2,c∈L^∞（Ω）且满足c-1/2△↓·b≥-（k1-α）λ1条件下,λ1这-△的第一特征值。α＞0.运用Faedo—Galerkin方法构造近似解,首先得出近似解在局部时间内存在,然后得出一些近似解的先验估计证明解可以延拓到区间[0,T],利用紧性定理得出解关于时间t和n无关。最后对逼近方程取极限,得出解整体存在。若耦合系数σ（s）、k（s）退化,构造其截断函数,仍可得出解存在且有界。 相似文献
15.
Stochastic models of an ideal, a degenerate ideal granite, and two models for metasomatically transformed granites have been compared with sequences of grains observed in granitic rocks of Yosemite Valley, California. Properties of the granitic rocks appear to show a relationship to the topography and stream directions, and may reflect the behavior of the granitic rocks with respect to fracturing and weathering. 相似文献
16.
M. A. Romanova 《Mathematical Geology》1987,19(7):613-653
Adamellites, granite porphyries, and white granites of the western dome of the Arga-Ynnykh-Khaya Massif (Yakutiya) have been studied with emphasis on the white granites. The main features of its magmatic crystallization and initial transformation have been obtained by investigating the intensity of transformations using stochastic Markov models. The most widespread transformation is albitization. Two varieties exist. First, and most common, is development of a secondary albite crystal between two primary grains of potassium feldspar. Second, secondary albite has developed between primary quartz grains. Both variants have definite probabilities of occurrence. Less commonly, but with a constant probability, a secondary quartz grain forms as an intergrowth between two grains of potassium feldspar. 相似文献
17.
研究了一类具有一致Dirichlet边界条件的非线性退化抛物型方程组解的爆破和全局存在性，给出了解全局存在的一个充分必要条件。 相似文献
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Bacterioplankton play key roles in the biogeochemical cycle and in organic contaminant degradation. The species richness and abundance of bacterial subgroups are generally distinct from each other, and this is attributed to their different functions in aquatic ecosystems. The spatiotemporal variations of eight phylogenetic subgroups （Actinobacteria, Bacteroidetes, Cyanobacteria, Firmicutes, Planctomycetes, alpha-, beta-, and gamma-Proteobacteria） derived from Donghu Lake were investigated using PCR-DGGE fingerprinting, to explore their responses to environmental factors. Results indicate that Actinobacteria and beta-Proteobacteria were the two largest bacterial subgroups detected. These two groups and Bacteroidetes showed clear seasonal patterns in composition of the operational taxonomic unit. Results also suggest that the bacterioplankton subgroups in Donghu Lake were significantly correlated with different environmental factors. In brief, the total nitrogen was one of the major factors regulating all the bacterioplankton except for Actinobacteria. However, total phosphorus, another important eutrophication factor, contributed to the two largest bacterial groups （Actinobacteria and beta-Proteobacteria）, as well as to the Cyanobacteria and Firmicutes. Therefore, the responses of bacterioplankton subgroups to environmental factors were different, and this should be attributed to the differences in the fimctions of different groups. 相似文献