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Sans résumé 相似文献
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Li Q Gray KE Zheng H Claus H Rosenkranz S Ancona SN Osborn R Mitchell JF Chen Y Lynn JW 《Physical review letters》2007,98(16):167201
Contrary to conventional wisdom, our purified La 2-2x Sr 1+2x Mn2O7 crystals exhibit CE-type orbital and charge order as the low-temperature ground state for a hole doping level h=0.5. For small deviations from h=0.5, the high-temperature CE phase is replaced at low temperatures by an A-type antiferromagnet without coexistence. Larger deviations result in a lack of CE order at any temperature. Thus, small inhomogeneities in cation or oxygen composition could explain why others commonly see this reentrance with coexistence. 相似文献
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Vincenzo Ancona 《Bulletin des Sciences Mathématiques》2006,130(6):525-552
In recent publications, we have defined complexes of differential forms on analytic spaces which are resolutions of the constant sheaf. These complexes were used to prove the existence of a mixed Hodge structure on the cohomology of analytic spaces which possess kählerian hypercoverings, in particular, projective algebraic varieties. We define an exterior product on these forms, which induces the cup product on the cohomology of analytic spaces. The main difficulty is to prove that this exterior product is functorial with respect to morphisms of analytic spaces. This exterior product can be used to prove that the cup product is compatible with the mixed Hodge structure on the cohomology. 相似文献
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Correlation spectroscopy as a tool for detecting losses of ligand elements in laser welding of aluminium alloys 总被引:1,自引:0,他引:1
T. Sibillano A. Ancona V. Berardi E. Schingaro P. Parente P.M. Lugar 《Optics and Lasers in Engineering》2006,44(12):1324-1335
The plasma plume induced during laser welding of metals is a mixture of metal vapour, coming from the vaporised weld pool surface and shielding gas. The influence of the shielding gas on the welded joints quality is not yet well understood and very few investigations, to the best of our knowledge, were addressed to study its role in case of welding of aluminium–magnesium alloys. In this paper we present a study of the dynamics of plasma plume produced in laser welding of 5xxx aluminium alloys by means of correlation spectroscopy. By our results we can correlate the influence of the welding speed, in case of ineffective gas shielding, to the loss of alloying elements. Finally, the results obtained are consistent with the EDX analysis performed in post-processing on the welded joints. 相似文献
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Vincenzo Ancona 《Annali dell'Universita di Ferrara》1978,24(1):205-208
Riassunto Si enuncia una forma relativa del teorema di algebricità degli spazi di Moišezon; se ne deduce che ogni modificazione analiticaX→Y è relativamente algebrica (localmente suY).
Le dimostrazioni complete appariranno in un lavoro di prossima pubblicazione.
Summary We state a relative form of the theorem of algebraisation of Moišezon spaces; we deduce that every analytic modificationX→Y is relatively algebraic (locally onY). The complete proofs will appear in a forthcoming paper.相似文献
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本文利用KDV方程所对应的线性方程解所具有的光滑效应及压缩映像原理,得到了Hirota-Satsuma系统初值问题的局部和整体适定性结果. 相似文献