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801.
Moschetto G Lauceri R Gulino FG Sciotto D Purrello R 《Journal of the American Chemical Society》2002,124(49):14536-14537
This unprecedented calixarene templated, noncovalent synthesis of multi-porphyrin complexes in aqueous solution makes it possible to plan the nature, stoichiometry, and sequence of porphyrins. The proposed method presents the same accuracy of the covalent approach and a 100% yield, but it is not as time-consuming as the latter method. 相似文献
802.
We explore compactly supported scaling functions of wavelet theory by means of classical umbral calculus as reformulated by
Rota and Taylor. We set a theory of orthonormal scaling umbra which leads to a very simple and elementary proof of Lawton's
theorem for umbrae. When umbrae come from a wavelet setting, we recover the usual Lawton condition
for the orthonormality of the integer translates of a scaling function. 相似文献
803.
804.
Domenico Giulini 《Communications in Mathematical Physics》1992,148(2):353-357
A recent result of Gibbons and Hawking on the existence of spin-Lorentz cobordisms is applied to the class of 3-manifolds that can support a non-negative scalar curvature metric. We call such manifolds admissible. It is shown how in general the existence of a spin-Lorentz cobordism restricts the number-mod-2 of certain prime manifolds to occur in the prime decomposition, which are explicitly listed in the case of admissible manifolds. 相似文献
805.
Mariano?GiaquintaEmail author Domenico?Mucci 《Calculus of Variations and Partial Differential Equations》2004,20(4):367-397
Weak limits of graphs of smooth maps
with equibounded Dirichlet integral give rise to elements of the space
. We assume that the 2-homology group of
has no torsion and that the Hurewicz homomorphism
is injective. Then, in dimension n = 3, we prove that every element T in
, which has no singular vertical part, can be approximated weakly in the sense of currents by a sequence of smooth graphs {u
k
} with Dirichlet energies converging to the energy of T. We also show that the injectivity hypothesis on the Hurewicz map cannot be removed. We finally show that a similar topological obstruction on the target manifold holds for the approximation problem of the area functional.Received: 9 May 2003, Accepted: 5 June 2003, Published online: 25 February 2004 相似文献
806.
In this paper we characterize the family of external lines to a hyperbolic quadric of PG
(3, q). 相似文献
807.
Index information algorithm with local tuning for solving multidimensional global optimization problems with multiextremal constraints 总被引:2,自引:0,他引:2
Multidimensional optimization problems where the objective function and the constraints are multiextremal non-differentiable
Lipschitz functions (with unknown Lipschitz constants) and the feasible region is a finite collection of robust nonconvex
subregions are considered. Both the objective function and the constraints may be partially defined. To solve such problems
an algorithm is proposed, that uses Peano space-filling curves and the index scheme to reduce the original problem to a H?lder
one-dimensional one. Local tuning on the behaviour of the objective function and constraints is used during the work of the
global optimization procedure in order to accelerate the search. The method neither uses penalty coefficients nor additional
variables. Convergence conditions are established. Numerical experiments confirm the good performance of the technique.
Received: April 2002 / Accepted: December 2002
Published online: March 21, 2003
RID="⋆"
ID="⋆" This research was supported by the following grants: FIRB RBNE01WBBB, FIRB RBAU01JYPN, and RFBR 01–01–00587.
Key Words. global optimization – multiextremal constraints – local tuning – index approach 相似文献
808.
Mario De Salvo Domenico Freni Giovanni Lo Faro 《Rendiconti del Circolo Matematico di Palermo》1997,46(1):29-51
In this paper one continues the study of hypergroups with for proper pairs. In particular one considers the case when the
scalars group is not empty and the set of non-scalar elements has size two or three.
This work is produced by support of the Italian M.U.R.S.T. (quota 40%). No version of this paper will be published elsewhere. 相似文献
809.
Vincenzo Frenna Nicol
Vivona Domenico Spinelli Giovanni Consiglio 《Journal of heterocyclic chemistry》1980,17(5):861-864
The kinetic behaviour of the geometrical isomers I-E and I-Z of the title compound in the presence of piperidine in benzene has been investigated. The kinetic results suggest that I-Z rearranges directly into 2,5-diphenyl-4-benzoylamino-1,2,3-triazole (II), whereas I-E probably rearranges only through the intermediate I-Z formed by isomerization. All the reactions studied are piperidine-catalyzed. 相似文献