Let f : X → B be a fibred surface of genus g whose general fibre is a double cover of a smooth curve of genus γ. We show that, for g > 4γ+1, 4 g−1 g−γ is a sharp lower bound for the slope of f , proving a conjecture of Barja. Moreover, we give a characterisation of the fibred surfaces that reach the bound. In the case g = 4γ+1 we obtain the same sharp bound under the assumption that the involut...

Using a B-alkyl Suzuki cross-coupling as a key step, a concise and stereocontrolled synthesis of five- to eight-membered triisopropylsiloxy ethers having (2Z)-(6,6-dimethoxyhexylidene) or (2Z)-(5,5-dimethoxypentylidene) side chains was developed. Prins-pinacol reactions of these precursors promoted by SnCl4 provide bicyclic products in which 5-, 6-, or 7-membered rings are joined by a C-C singl...

Reţelele peer-to-peer sunt sisteme distribuite ideale pentru a stoca date replicate, în scopul de a le putea obţine rapid şi transparent, orideunde am dori. O problemă importantă, când vine vorba de aceste sisteme distribuite, este replicarea datelor critice într-o manieră persistentă. Această problemă o adresăm prin lucrarea de faţă, propunând un mecanism suplimentar de asigurare a redundanţei...

A fairly extensive literature from the field of empirical psychology has provided evidence that personality factors and attitudes toward credit may influence individuals' debt financing decisions. This paper investigates the importance of these factors by analysing the results of an original survey about the recourse to consumer credit, conducted on a wide sample of Italian households. Three ma...

Physical localization of molecular markers and assignment of the 15th linkage group to chromosome 11 of the karyotype in cassava (Manihot esculenta Crantz) were achieved using primed in situ labeling. Amplified signals for both the EST507-1 and SSRY13-5 markers were consistently observed in different stages of cell division. A comparison of the length, arm ratio, and other morphological charact...

Matti Aksela1;2, Jorma Laaksonen1, Erkki Oja1 Helsinki University of Te hnology Neural Networks Resear h Centre P.O.Box 5400, Fin-02015 HUT, Finland fmatti.aksela,jorma.laaksonen,erkki.ojag hut. Jari Kangas Nokia Resear h Center P.O.Box 100, Fin-33721 Tampere, Finland jari.a.kangas nokia. om Abstra t Adaptation is an effe tive method for improving lassi ation a ura y and a ommittee stru ture an...

Am conceput şi implementat un sistem care permite măsurarea parametrilor calităţii serviciilor (QoS) în reţelele de calculatoare. Folosind acest sistem am evaluat performanţele unor componente de reţea şi am studiat în mod obiectiv cerinţele câtorva aplicaţii de reţea, astfel încât acestea să ofere o calitate acceptabilă de către utilizator. In acest articol prezentăm rezultate pentru transferu...

Prins cyclization of homoallylic alcohols, thiols, and amines with various aldehydes in an ionic liquid HF salt (Et(4)NF.5HF) afforded the corresponding 4-fluorinated heterocycles in excellent yields.

BACKGROUND Various frequencies of sperm aneuploidy are reported in sperms of subfertile patients compared to normal individuals. Moreover, sperm DNA damage is shown to be associated with male infertility. In this study, the rate of DNA damage and frequencies of aneuploidy in sperms of subfertile patients was investigated. METHODS Semen samples were obtained from healthy normal and subfertile ...

We give a necessary and sufficient criterion when a normal CP-map on a von Neumann algebra admits a restriction to a maximal commutative subalgebra. We apply this result to give a far reaching generalization of Rebolledo’s sufficient criterion for the Lindblad generator of a Markov semigroup on B(G). This work is supported by research funds of Italian MIUR (PRIN 2005). MS is supported by resear...