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981.
Anna Maria Venezia Ronald G. Cavell 《Journal of Electron Spectroscopy and Related Phenomena》1985,36(3):281-296
Photoelectron and Auger (MNN) spectra of tetramethyltin and hexamethylditin have been measured and the results compared to those of metallic tin. Energies and intensities of the Auger lines are in agreement with theory based on an Intermediate Coupling scheme since LS coupling theory was inadequate. Relaxation contributions have been evaluated. 相似文献
982.
Using light-front dynamics, and the notion of the running effective quark mass, we propose a model of the three-quark nucleon wave function, which accounts simultaneously both for the low and the high energy experimental data. Our wave function is a product of a spinor part, inferred from the QCD sum rules, and a gaussian scalar factor, taken for simplicity. Including all three Ioffe currents we get from one wave function both the negative neutron charge radius 〈r2〉neutron=-0.108 fm2 and the decreasing d/u ratio in the proton for xBj increasing from 0.5 to 1. 相似文献
983.
The influence of silica addition and of the annealing on the structure and properties of phosphate coatings are investigated. It has been observed that silica stabilizes phosphates and reduces the transport of iron towards the surface. 相似文献
984.
985.
Anna Tozzi 《Topology and its Applications》1983,16(1):69-80
Characterizations of epidense subcategories of topological categories and of existence of epidense hulls have been described in [2, 3, 4]. In this paper a similar characterization is given in a much more general setting; for example the category need not have products. The relationship between finite factorization structures and existence of epidense hulls is investigated. It is found to be analogous to the relationship between general factorization structures and epireflective hulls. 相似文献
986.
Luigi P. Battaglia Anna Bonamartini Corradi Francesco A. Devillanova Gaetano Verani 《Transition Metal Chemistry》1979,4(4):264-266
Summary The crystal structure of the title compound has been determined from x-ray diffractometer data by the heavy-atom method and refined anisotropically by least-squares calculations. Crystals are monoclinic, space groupP 21/c, with unit cell dimensions:a=7.321(1),b=14.622(2),c=14.827(2) Å,=92.95(2), Z=4. The finalR index is 4.6%. The copper coordination is trigonal, involving the sulphur atoms of twoN-ethyl-1,3-imidazolidine-2-thione molecules and one chlorine atom. The structure is held together by two intramolecular N-HCl hydrogen bonds and by normal van der Waals interactions. 相似文献
987.
Anna Maria Ghirlanda 《Annali dell'Universita di Ferrara》1962,11(1):93-106
Riassunto Si introducono certi gruppi di numeri associati ad un grafo o singrammaG che vengono chiamati caratteristiche diG. Si studiano alcune proprietà delle caratteristiche e se ne fanno applicazioni a vari problemi sui grafi.
Lavoro eseguito nell’ambito del Gruppo N. 26 del Comitato Naz. per la Mat. del C.N.R. 相似文献
Résumé On introduit certains groupes de nombres qui sont associés à un grapheG et qu’on appelle caractéristiques deG. Ou étudie quelques proprietés des caractéristiques et on en fait des applications a divers problèmes sur les graphes.
Lavoro eseguito nell’ambito del Gruppo N. 26 del Comitato Naz. per la Mat. del C.N.R. 相似文献
988.
Dr. Anna Klingst 《Mathematical Methods of Operations Research》1959,3(2):81-87
Zusammenfassung Ermittlung des günstigsten Bestellzeitpunktes, wenn die Zeitspanne zwischen der Bestellung und der Lieferung eine Zufallsveränderliche mit bekannter Verteilung ist.
Summary Determination of the optimal time for placing orders in those cases where the time interval between order and supply is a random variable with known distribution.相似文献
989.
Francesco A. Devillanova Gaetano Verani Luigi P. Battaglia Anna Bonamartini Corradi 《Transition Metal Chemistry》1980,5(1):362-364
Summary New complexes of copper(I) withN,N-dialkylsubstituted imidazolidine-2-thione ligands were prepared by reduction of CuX2 (X = Cl or Br). The i.r. spectra show that in all the complexes the ligand coordinates through the sulphur atom. The crystal structure of chloro-bis(N,N-dimethylimidazolidine-2-thione)copper(I) has been determined from x-ray diffraction data. Crystals are monoclinic. space groupC
2, with unit cell dimensions:a = 16.022(15),b = 9.942(10),c = 15.112(15) A, = 139.84(10)2, Z = 4. The final R index is 5.2%. The copper coordination is trigonal, involving sulphur atoms of the two ligands and One chlorine atom. The steric effect of the two methyls imposes a rotation of the imidazolidine rings with respect to the coordination plane. The dihedral angle between the mean plane of thiourea moieties. parallel one with the other. and the coordination plane is 119.3°.This work was supported by the National Research Council (C.N.R.) of Rome. 相似文献
990.
I. David Reingold Anna M. Butterfield Robert S. Walters Jr. Susan Scheuring Milan Gembický Peter Baran 《Tetrahedron letters》2005,46(22):3835-3837
Perhydrophenanthrene-1,5,10-trione (6) was isolated from the reaction of methyl 3-(carboxymethyl)cyclohexanone and cyclohexenone in a tandem Michael-Claisen reaction. NMR and X-ray analysis confirmed the structure of the product. 相似文献