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21.
MOHAMED SAÏDI 《Compositio Mathematica》1997,107(3):319-338
Let R be a discrete complete valuation ring, with algebraically closedresidue field. Let X be a semi-stable R-curve, with smooth generic fibre. In this paper we study tame coverings of X. 相似文献
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Furman JD Melot BC Teat SJ Mikhailovsky AA Cheetham AK 《Physical chemistry chemical physics : PCCP》2011,13(17):7622-7629
Three novel inorganic-organic framework compounds containing the organic chromophore ligand 9-fluorenone-2,7-dicarboxylic acid (abbreviated H(2)FDC) and barium (BaFDC), cadmium (CdFDC) and manganese (MnFDC), respectively, have been synthesized and evaluated for their use as phosphor materials for solid state lighting and other applications. The results are compared with two earlier reported structures containing the same ligand with calcium (CaFDC) and strontium (SrFDC). The barium- and cadmium-containing compounds both show blue excited, yellow photoluminescence, while the manganese structure does not. The trends in luminescent efficiency for the Ba, Cd, Ca, and Sr derivatives are discussed in relation to crystallographic, optical, and low-temperature specific heat considerations. 相似文献
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E. K. Starostin D. B. Furman A. V. Ignatenko A. P. Barkova G. I. Nikishin 《Russian Chemical Bulletin》2006,55(11):2016-2019
A new route to diesters of symmetrical octene-, decene-, and dodecenedioic acids was proposed. The ratio of the cis/trans-isomers was 1: 4. The synthesis involved oxidative splitting of five-, six-, and seven-membered cycloalkanones with hydrogen
peroxide into the corresponding ω-alkenoic acids followed by esterification and metathesis over Re2O7/B2O3-Al2O3-SnMe4.
Dedicated to Academician O. M. Nefedov on the occasion of his 75th birthday.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 1942–1944, November, 2006. 相似文献
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Recently some important results have been obtained in calculating absolute α-decay widths, the calculations having been performed in the zero range α-particle approximation. In this paper the effects of the finite size of the α-particle are considered. Two important effects have been found: (i) for the finite size calculation, the absolute α-decay widths decrease by 2–3 orders of magnitude, and (ii) the finite size effects are strongly dependent on the shell model configuration of the initial nucleus. In the framework of the superfluid model the absolute probabilities of finite size α-particle emission have been calculated for the favored α-transitions of more than 200 spherical nuclei. The theoretical α-widths turn out to be smaller than the experimental ones by a factor of 10, which is approximately constant for all the nuclei studied. 相似文献
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We have computed the first non-trivial QCD corrections to the quark-quark scattering process which contributes to the production of hadrons at large pT in hadron-hadron collisions. Using quark distribution functions defined in deep inelastic scattering and fragmentation functions defined in one particle inclusive e+e? annihilation, we find that the corrections are large. This implies that QCD perturbation theory may not be reliable for large-pT haron physics. 相似文献