196,331 research outputs found
Minerals and materials: building principles and applications - A special issue in honour of Giovanni Ferraris and Stefano Merlino. Preface
No full textGroup-theoretical investigation of the structural basis for the formation of twinned crystals
No full textContains fulltext :
143226.pdf (Publisher’s version ) (Open Access)Radboud Universiteit NijmegenPromotores : Heckman, G.J., Nespolo, M. Co-promotor : Souvignier, B.D.72 p
Fruttiferi tropicali e subtropicali. Nespolo del Giappone
No full textIl nespolo del Giappone si coltiva nelle aree localizzate tra il 25° parallelo Sud e il 38° parallelo Nord. La produzione mondiale, stimata attorno alle 200.000 tonnellate, è concentrata in Cina, Giappone, Pakistan, nei Paesi del Mediterraneo (Spagna, Algeria, Turchia, Israele e Italia) e, in misura minore, in Portogallo, India, Brasile, Cile, Stati Uniti e Brasile.
In Europa l’offerta è prevalentemente coperta dalla Spagna con le provincie di Alicante, Granada e Malaga, dalla Turchia e in piccolissima parte dall’Italia, dove la produzione è concentrata essenzialmente in Sicilia. In questo capitolo vengono trattati gli aspetti salienti della specie quali morfologia, fisiologia, tecniche colturali, avversità biotiche e abiotiche, postraccolta e commericalizzazione
Editoriale
No full textUna riflessione sulla città contemporanea non può prescindere da una indagine sulle periferie, dalla comprensione dei suoi caratteri, del suo ruolo. Questo terzo numero della rivista è dedicato alla riflessione sui vari aspetti della periferia e sulle varie forme che questa assume; analizzandone i caratteri attuali, oltre alle tendenze nella riqualificazione. Dalla importanza della città pubblica; agli strumenti urbanistici per l’attuazione di processi innovativi di recupero; alla determinazione del significato attuale di periferia; al problema dell’abitazione, ponendo anche un particolare sguardo al recupero degli spazi aperti, ed in generale dello spazio pubblico che questi connettono, oltre alle complesse dinamiche della trasformazione della città che ne individuano la potenzialità di nuova centralità urbana
Scaling phenomena driven by inhomogeneous conditions at first-order quantum transitions
No full textWe investigate the effects of smooth inhomogeneities at first-order quantum transitions (FOQTs), such as those arising in the presence of a space-dependent external field, which smooths out the discontinuities of the low-energy properties at the transition. We argue that a universal scaling behavior emerges in the space transition region close to the point in which the external field takes the value for which the homogeneous system undergoes the FOQT. We verify the general theory in two model systems. We consider the quantum Ising chain in the ferromagnetic phase and the q-state Potts chain for q = 10, investigating the scaling behavior which arises in the presence of an additional inhomogeneous parallel and transverse magnetic field, respectively. Numerical results are in full agreement with the general theory
Finite-Size Scaling at First-Order Quantum Transitions
No full textWe study finite-size effects at first-order quantum transitions (FOQTs). We show that the low-energy properties show a finite-size scaling (FSS) behavior, the relevant scaling variable being the ratio of the energy associated with the perturbation driving the transition and the finite-size energy gap at the FOQT point. The size dependence of the scaling variable is therefore essentially determined by the size dependence of the gap at the transition, which in turn depends on the boundary conditions. Our results have broad validity and, in particular, apply to any FOQT characterized by the degeneracy and crossing of the two lowest-energy states in the infinite-volume limit. In this case, a phenomenological two-level theory provides exact expressions for the scaling functions. Numerical results for the quantum Ising chain in transverse and parallel magnetic fields support the FSS Ansatzes
The Everlasting Challenges of Mathematical and Theoretical Crystallography
No full textThe IUCr Commission on Mathematical and Theoretical Crystallography (MaThCryst) was established in 2005 after a three-year informal existence as unofficial workgroup. The reasons for this initiative were essentially the need to draw new lymph in a field that was sliding away from our community, and to energize the education of young (and sometimes less young) crystal-lographers in the foundations that too often are overlooked in the University curricula. The task seemed extremely challenging , but despite some scepticism we had to face at first, our work has been successful from the beginning. Today we count more than fifty events (workshops, satellite conferences, schools) during our fifteen years of existence. In relation with this intense activity , we have published four special issues and the present one is our fifth achievement. It collects papers submitted by the participants to the several events we have organized in the summer of 2019. Umayahara and Nespolo present a historical perspective of the barely known pioneering work of Japanese crystallographers on modular structures, with a revised classification based on groupoid approach which generalizes the original description (ar-ticle number 1900045). Nespolo and co-workers present a potentially case of a mis-attribution of X-ray diffraction data that could represent a trap for the less-experienced crystallographer (article number 1900063). Stoeger and Rotter discuss a complex case of polytypism and twinning in a crystal with simple chemistry and demonstrate how this sort to problems need a crystallographic knowledge well above what can be obtained in a normal training aiming at a routine approach (article number 1900164). Stoeger and co-workers present a different case of polytypism in a chemically more complex structure, where the coexistence of two different polytypes leads to residual peaks in the electron density (arti-cle number 1900182). Kurlin challenges the problem of quantifying the similarity between crystal structures, in search for an algorithm capable of discriminating nearly identical structures with Prof. M. Nespol
INUSUALE PRESENTAZIONE DI INFEZIONE DA TOXOPLASMA GONDII NEL GATTO, CON LESIONE SIMIL NEOPLASTICA NEL CAVO ORALE - 42° Congresso Nazionale S.C.I.V.A.C
No full textDr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
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