Search results for "covering"
showing 10 items of 61 documents
Epistemic and didactic values of the demonstrative process in different cultures: a case study in Geometry with Chinese and Italian students
2011
Dismantling and copper recovery from Waste Printed Circuit Boards (WPCBs) using an integrated hydro-electrometallurgical approach
Irreducible components of Hurwitz spaces of coverings with two special fibers
2013
In this paper we prove new results of irreducibility for Hurwitz spaces of coverings whose monodromy group is a Weyl group of type B_d and whose local monodromies are all reflections except two.
On the classification of Kim and Kostrikin manifolds
2006
International audience; We completely classify the topological and geometric structures of some series of closed connected orientable 3-manifolds introduced by Kim and Kostrikin in [20, 21] as quotient spaces of certain polyhedral 3-cells by pairwise identifications of their boundary faces. Then we study further classes of closed orientable 3-manifolds arising from similar polyhedral schemata, and describe their topological properties.
SISTEMI DI COPERTURE INNOVATIVE NEI CONTESTI ANTICHI
2014
La ricerca è indirizzata al tema delle coperture in vetro a protezione di siti archeologici. Tale scelta è stata influenzata dalle seguenti considerazioni: gli ultimi decenni sono stati caratterizzati da un incremento delle coperture trasparenti protettive; il tema delle strutture di copertura in contesti archeologici e ciò che riguarda la loro progettazione, è stato, e continua ad essere oggi, molto dibattuto tra gli esperti in tutto il mondo; la costante evoluzione tecnologica del vetro continua a incrementare le sue possibilità d’uso in architettura. Tale materiale presenta numerosi vantaggi come l’apparente leggerezza e la trasparenza ma in ambito archeologico pone problematiche che rig…
MR 3020148 Reviewed McMullen, C.T. Braid groups and Hodge theory. Mathematische Annalen, vol. 355 (2013), pp.893–-946. (Reviewer Francesca Vetro) 20F…
2014
In this paper, the author studies the unitary representations of the braid group and the geometric structures on moduli space that arise via the Hodge theory of cyclic branched coverings of P^1. In particular, the author is interested in the classification of certain arithmetic subgroups of U(r, s) which envelop the image of the braid group. The author investigates their connections with complex reflection groups, Teichm\"{u}lller curves, ergodic theory and problems in surface topology.
MR 2831984 Reviewed Masuda T. Families of finite coverings of the Riemann sphere. Osaka J. Math. 48 (2011), no. 2, 515--540. (Reviewer Francesca Vetr…
2012
Let $G$ be a finite group and let $H$ be a subgroup of $G$ which does not contain normal subgroups of $G$ except $\{ id \}$. The group $G$ acts on the set of the left coset of $G / H$ as follows: \begin{center} $(g, H a) \rightarrow H a g^{- 1}$. \end{center} The author observes that the action defined above is effective and this gives a permutation representation of $G$, $R: G \rightarrow S_{d}$, where $d =[G : H]$. The condition on $H$ ensures that $R$ is injective. Thus, $G$ can be seen as a transitive subgroup of $S_{d}$. Let $X$ and $ Y$ be connected complex varieties. A finite covering $f: X \rightarrow Y$, which branches at most at $B$, is said a $(G, H)-$coverings if there is a surj…
Seju aizsedzoša reliģiska apģērba nēsāšanas aizlieguma juridiskie aspekti
2018
Maģistra darba nosaukums ir ’’Seju aizsedzoša reliģiska apģērba nēsāšanas aizlieguma juridiskie aspekti’’. Paredzot aizliegumu publiskās vietās nēsāt seju aizsedzošu apģērbu, var tikt ierobežotas personas tiesības uz reliģijas brīvības ārējo izpausmi, jo reliģijas brīvības ārējā izpausme ietver arī galvassegu nēsāšanu, kas it sevišķi ir attiecināms uz musulmaņu sievietēm. Šobrīd Latvijā tiek izstrādāts likums, ar kuru tiek plānots aizliegt publiskās vietās nēsāt seju aizsedzošu apģērbu. Tādējādi ir nepieciešams apzināt, izpētīt un izvērtēt tos juridiskos aspektus saskaņā ar kuriem šāds ierobežojums būtu atzīstams par tiesisku. Maģistra darba mērķis ir to juridisko aspektu noskaidrošana un i…
Kvantu algoritmi punktu sadalīšanai pa taisnēm
2021
Bakalaura darba mērķis ir uzlabot klasisko algoritmu punktu sadalīšanai pa taisnēm, pielietojot kvantu algoritmus. Darbā tiek apskatīti klasiskie algoritmi punktu sadalīšanas problēmai un sadalīšanas problēmas speciālgadījumam, kad punktu izvietošanā atbilsts daļiņu pozīcijai pēc sadursmes lielā hadronu paātrinātājam. Darba rezultātā tiek piedāvāti kvantu algoritmi ar sarežģītību O(n^(1+(k-1)/k)/k) pamata problēmai un O(n^1.5/√k log(n/k) ) speciālgadījumam. Dotie algoritmi uzlabo efektīvāko zināmo klasisko algoritmu, kuram darbības laiks ir O(n^2/k*log(n/k) ). Secinājumos tiek piedāvāts paņēmiens, ka pielietot speciālgadījuma rezultātus reālajam daļiņu ceļu atrašanas uzdevumam, kad daļiņu…
La inscripción de la ciudadanía en la cuba neocolonial (1902-1919) : Sucinta referencia histórico-jurídica
2021
This historical-legal account brieflycovering 17 years of civil registration activity carried out during the neocolonial period by Municipal Judges and Secretaries, specifically that related to registration of Cuban citizens)becomes considerably relevant to understand and to godeeper into the origins of this complex process, as well asto achieve a re-encounter with the history of those who passed through those times, currently a hidden history in the shadows of Civil Registration offices, but still alive and thus allowing us to find all the beauty that there was in it.