87,314 research outputs found
Na-feldspar (F) and kaolinite (K) system at high temperature: Resulting phase composition, micro-structural features and mullite-glass Gibbs energy of formation, as a function of F/K ratio and kaolinite crystallinity
No full textThe system Na-feldspar (F) and kaolinite (K) was investigated at temperatures of interest in ceramic applications (1200-1280 degrees C) to study the effects of F/K ratios by weight and crystallinity degree of kaolinite on the final product, micro-structural features and mullite-glass Gibbs energy of formation (Delta G(eff)). Mullite and glass are the dominant phases; in general, the higher the temperature, the larger the former. An F/K increase promotes the formation of glass and secondary mullite, appearing along with the primary one. Delta G(eff) was modelled by alpha(T) x (F/K)(2) + beta(T) x F/K + gamma(T), alpha, beta and gamma being linear functions of temperature whose coefficients were determined by fitting the Delta G(eff)-theoretical to the Delta G(eff)-obtained from the measured phase compositions. Delta G(eff) is less affected by temperature than by F/K, whose increase shifts equilibrium towards glass phases. The Delta G(eff)-curves for ordered and disordered kaolinite intersect one another at F/K similar to 0.5, a ratio close to that used in industrial practice
Un fiume di luce : cento anni di storia dell’AEM
No full textOfferti da
CorriereStore.it
I Gialli del Corriere della Sera
La grande letteratura si fa mistero, intrigo, suspense. Corriere della Sera ha scelto i libri gialli più appassionanti della migliore tradizione angloamericana, opere dell’età d’oro del mistery che hanno aperto la strada al thriller moderno.
* Scopri di più >>
* Libri >
* Economia e finanza >
* Studi industriali
Un fiume di luce. Cento anni di storia della AEM
Un fiume di luce. Cento anni di storia della AEM
Pavese Claudio
Prezzo € 24,90
Editore Rizzoli
Anno pubblicazione 2011
Numero pagine 306
ISBN 9788817053990
Collana Varia illustrati
Stato Disponibile in 3-5 giorni lavorativi
Recensioni 0
ATTENZIONE! Chiudi Stai acquistando un titolo in prenotazione. Per ulteriori titoli concludi prima questo ordine.
ATTENZIONE! Chiudi Il titolo precedentemente in carrello è stato sostituito, ne puoi prenotare uno solo per ordine.
Aggiungi
facebook sharing Condividi
La trama di Un fiume di luce. Cento anni di storia della AEM
Un secolo di intuizioni, intelligenza, creatività per dare luce ed energia a una Milano che si inventa capitale economica d'Italia. Sullo sfondo delle vicissitudini che hanno segnato la vita politica ed economica milanese a partire dall'unità d'Italia, questo volume ci restituisce le vicende e le immagini dei protagonisti, spesso sconosciuti al grande pubblico, che per cento anni hanno guidato la municipalizzata milanese attraverso le ambivalenze di una politica non sempre lungimirante, i repentini cambiamenti della realtà economica e industriale italiana, le sfide sempre più urgenti della tecnologia e dell'ambiente. Il racconto di un'azienda, della sua crescita, dei suoi rinnovamenti, dei talenti e delle capacità che hanno saputo illuminare, muovere, riscaldare una città sempre più metropoli: "un fiume di luce", come la definì Nelo Risi. Ma anche la storia di una Milano e di un'Italia che siamo stati e che possiamo ancora essere. Prefazione di Bruno Tabacci; appendice iconografica a cura di Fabrizio Trisoglio; appendice biografica a cura di Stefano Morosin
A note on q-covering designs in PG(5,q)
No full textA construction of q-covering designs in PG(5, q) is given, providing an improvement on the upper bound of the q-covering number (6,3,2)
Blocking sets of Hermitian generalized quadrangles
No full textSome infinite families of minimal blocking sets on Hermitian generalized quadrangles are constructed
New infinite families of hyperovals on H(3,q2),q odd
No full textTwonewinfinitefamiliesofhyperovalsonthegeneralizedquadrangleH(3,q2),q odd, are constructed
On the intersection of a Hermitian surface with an elliptic quadric
No full textWe investigate the intersection between the generalized quadrangle arising from a Hermitian surface H(3, q2) and an elliptic quadric Q-(3, q2) of PG(3, q2). In odd characteristic we determine the possible intersection sizes between H(3, q2) and Q-(3, q2) under the hypothesis that they share the same tangent plane at a common point. When the characteristic is even, we determine the configuration arising from the intersection of H(3, q2) and Q-(3, q2), provided that the generators of H(3, q2) that are tangents with respect to Q-(3, q2) are the extended lines of a symplectic generalized quadrangle W(3, q) embedded in H(3, q2). As a by-product, new infinite families of hyperovals on H(3, q2) are constructe
Hemisystems of Q(6,q), q odd
No full textAn infinite family of hemisystems of Q(6,q), q odd, admitting the group PSL(2, q2) is constructed. Other sporadic examples are also provided. As a by product infinite families of intriguing sets of Q(6,q) are given
Hyperoval constructions on the Hermitian surface
No full textNew infinite families of hyperovals of the generalized quadrangle H(3,q(2)) are provided. They arise in different geometric contexts. More precisely, we construct hyperovals by means of certain subsets of the projective plane called here k-tangent arcs with respect to a Hermitian curve (Section 2), hyperovals arising from the geometry of an orthogonal polarity commuting with a unitary polarity (Section 3), hyperovals admitting the irreducible linear group PSL(2, 7) as a subgroup of PGU(3, q(2)), q = p(h), p equivalent to 3,5 or 6 (mod 7) and h an odd integer (Section 4). Finally we construct hyperovals by means of the embedding of PSp(4, q) < PGU(4, q2) as a subfield subgroup (Section 5)
The m-ovoids of W(5,2) and their generalizations
No full textIn this paper we are concerned with m-ovoids of the symplectic polar space W(2n+1,q), q even. In particular we show the existence of an elliptic quadric of PG(2n+1,q) not polarizing to W(2n+1,q) forming a [Formula presented]-ovoid of W(2n+1,q). A further class of (q+1)-ovoids of W(5,q) is exhibited. It arises by gluing together two orbits of a subgroup of PSp(6,q) isomorphic to PSL(2,q2). We also show that the obtained m-ovoids do not fall in any of the examples known so far in the literature. Moreover, a computer classification of the m-ovoids of W(5,2) is acquired. It turns out that W(5,2) has m-ovoids if and only if m=3 and that there are exactly three pairwise non-isomorphic examples. The first example comes from an elliptic quadric Q−(5,2) polarizing to W(5,2), whereas the other two are the 3-ovoids previously mentioned
- …
