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排序方式: 共有91条查询结果,搜索用时 15 毫秒
1.
David Ajó Maurizio Casarin Gaetano Granozzi Ignazio Fragalá 《Chemical physics letters》1981,80(1):188-191
The He(I) photoelectron spectra of 5-azauracil (1,3,5-triazine-2,4(1H,3H)-dione) and 6-azauracil (1,2,4-triazine-3, 5(2H,4H)-dione) are presented. The spectra are assigned by using INDO/S calculations and comparison arguments with uracil. The first ionization energy in the title compounds is higher than in the usual nucleic acid bases. 相似文献
2.
Vecchio Ciprioti Stefano Rotaru Andrei Blanco Ignazio Erceg Matko 《Journal of Thermal Analysis and Calorimetry》2020,142(5):1601-1604
Journal of Thermal Analysis and Calorimetry - 相似文献
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Salvatore Giuffrida Guglielmo G. Condorelli Lucia L. Costanzo Giorgio Ventimiglia Raffaella Lo Nigro Maria Favazza Enrico Votrico Corrado Bongiorno Ignazio L. Fragalà 《Journal of nanoparticle research》2007,9(4):611-619
Liquid Phase Photo-Deposition (LPPD) technique has been used to obtain both colloidal particles and thin films of metallic
and chloride nickel from solutions of only precursor Ni(acac)2 (acac=2,4-pentandionato). Metallic nickel was obtained from ethanol solutions by direct nickel(II) photoreduction at 254 nm
and by acetone sensitised reaction at 300 nm. In this latter process the rate was higher than in the first one. NiCl2 was formed from CCl4 solution by a solvent-initiated reaction. TEM analysis, performed on colloidal particles of nickel, showed that their dimensions
are in the range 2–4 nm. The films did not present carbon contamination and were characterized by AFM, XPS and GIXRD. Metallic
films consisted of particles of 20–40 nm that are the result of the aggregation of smaller crystallites (4–5 nm). Larger agglomerations
(around 200 nm) have been observed for NiCl2 films. 相似文献
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Zusammenfassung Es werden einige Versuche an Kaninchen und Menschen über die Millon'sche Reaktion des Harns mitgeteilt. Ihre Intensität steigt an, wenn Tyrosin zugeführt wird, und zwar erheblich mehr nach dl-Tyrosin als nach l-Tyrosin. Ein Teil der Millon-Substanzen ist in Äther löslich, der ebenfalls nach der razemisierten stärker zunimmt als der nach der natürlichen Aminosäure. 相似文献
7.
Ignazio Becchi 《Meccanica》1972,7(3):147-150
Summary The limits of integration of the free surface flow equation are investigated. For this purpose some terms, seldom used in ordinary practice, although they have been already deduced by other Authors, are introduced.The complete form of differential equation shows that conditions of elliptical behaviour may occur. These conditions, examined for a two-dimensional case, seem to coincide with known conditions of the existence of roll-waves
Sommario Allo scopo di ricercare i limiti del campo di integrazione dell'equazione differenziale del moto per le correnti a pelo libero si completa la forma classica tramite l'introduzione di alcuni termini, raramente utilizzati nella pratica, ma parzialmente già introdotti da altri Autori.Analizzando l'equazione differenziale ottenuta si rileva la possibilità di un comportamento ellittico. Il limite di passaggio a tale comportamento, in un moto bidimensionale, sembra coincidere con le condizioni per il realizzarsi del deflusso a roll-waves.相似文献
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Ignazio Becchi 《Meccanica》1979,14(1):19-25
Summary As many hydraulic problems involving numerous independent physical variables the sediment transport phenomena are generally analysed by means of empirical formulas, that are based on dimensional analysis and experimental data fitting.A schematic mechanical moving-layer model is proposed in order to derive more informations about the local behaviour of the grains movement.Although the resulting mathematical problem seems arduous to integrate in a general way, its characteristics are analysed and the results are compared with its physical behaviour.
Work supported by the grant C.N.R. no 76.01123.07. 相似文献
Sommario I fenomeni di trasporto dei sedimenti come molti problemi idraulici legati a numerose variabili fisiche, vengono in genere affrontati con l'impiego di formule fenomenologiche basate sull'analisi dimensionale e sull'adeguamento ai risultati sperimentali.Per conseguire una migliore conoscenza delle leggi del moto dei grani di sedimento viene proposto un modello meccanico semplificato a strato mobile.Il problema matematico risultante non consente un'integrazione diretta ma dall'analisi del suo campo di impiego si ottengono le caratteristiche del problema che vengono messe a confronto con i comportamenti fisici noti per via sperimentale.
Work supported by the grant C.N.R. no 76.01123.07. 相似文献
10.
Malandrino G Perdicaro LM Condorelli G Fragalà IL Rossi P Dapporto P 《Dalton transactions (Cambridge, England : 2003)》2006,(8):1101-1106
A novel nickel beta-diketonate adduct, Ni(tta)2.tmeda, has been synthesized using 2-thenoyltrifluoroacetone as the beta-diketonate and N,N,N,'N'-tetramethylethylendiamine as the Lewis base. It has been characterized by elemental analyses, IR, 1H NMR, 13C NMR spectroscopy and single-crystal X-ray diffraction studies. Physical and thermal properties of Ni(tta)2.tmeda precursor have been also extensively investigated. Its efficacy as a metal-organic chemical vapour deposition (MOCVD) precursor for the growth of nickel oxide films has been fully tested by applying it to the deposition of NiO films on quartz substrate. NiO thin films have been characterized by X-ray diffraction (XRD), scanning electron microscopy and UV spectroscopy. 相似文献