نتایج جستجو برای: asteroidal number
تعداد نتایج: 1168672 فیلتر نتایج به سال:
Linear systems whose associated block Jacobi iteration matrix B is weakly cyclic generated by the cyclic permutation u = (ul , 02,. . . , up) in the spirit of Li and Varga are considered. Regions of convergence for the corresponding block pcyclic SOR method are derived and the exact convergence domains for real spectra, u(BP), of the same sign are obtained. Moreover, analytical expressions for ...
Figure 1. Stability fields of sulfate and bisulfide at a total pressure of 100 bar. The thin solid curves represent equal activities of SO4 and HS at various pH. The QFM curve represents equilibrium (2) and HM stands for hematitemagnetite buffer. Sulfate is stable at higher temperature and lower ƒH2. Low-temperature formation of sulfate in asteroidal environments requires complete oxidation of ...
The recently recovered Antarctic achondrites Graves Nunatak 06128 and 06129 are unique meteorites that represent high-temperature asteroidal processes in the early solar system never before identified in any other meteorite. They represent products of early planetesimal melting (4564.25 ± 0.21 Ma) and subsequent metamorphism of an unsampled geochemical reservoir from an asteroid that has charac...
CAL: HIGH POROSITY ≠ HIGH PERMEABILITY P. A. Bland, M. D. Jackson, R. F. Coker, B. A. Cohen, G. K. Benedix. Impacts & Astromaterials Research Centre (IARC), Dept. Earth Sci. & Eng., Imperial College London, SW7 2AZ, UK. E-mail: [email protected]. IARC, Dept. Mineralogy, Natural History Museum, London SW7 5BD, UK. Los Alamos National Lab., Los Alamos, NM 87545, USA. Inst. Meteoritics, Universit...
The complex suite of organic materials in carbonaceous chondrite meteorites probably originally formed in the interstellar medium and/or the solar protoplanetary disk, but was subsequently modified in the meteorites' asteroidal parent bodies. The mechanisms of formation and modification are still very poorly understood. We carried out a systematic study of variations in the mineralogy, petrolog...
A symmetric matrix is Robinsonian if its rows and columns can be simultaneously reordered in such a way that entries are monotone nondecreasing in rows and columns when moving toward the diagonal. The adjacency matrix of a graph is Robinsonian precisely when the graph is a unit interval graph, so that Robinsonian matrices form a matrix analogue of the class of unit interval graphs. Here we prov...
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