198,447 research outputs found
Introduzione alle costruzioni in legno Teaching Publication n. 10
No full textDispense per il corso di tecnica delle costruzioni del prof. Piazza (univ di trento) e per il Corso di Costruzioni in legno del prof Bonafede (IUAV
On the preparatory processes of the M6.6 earthquake of June 17th, 2000, in Iceland
No full textA model is proposed to explain the spatial distribution of foreshocks of the June 17th 2000, Ms 6.6 earthquake in the South Iceland Seismic Zone (SISZ) and the high stress drop of the mainshock. Fluids of magmatic origin, ascending at near-lithostatic pressure through a low permeability layer perturb the regional stress field, inhibiting fluid flow laterally, where a high strength asperity is left. The asperity is modeled as elastic, embedded within a medium with low effective rigidity. Regional stresses due to tectonic motions are perturbed by the presence of the asperity, enhancing the production of hydrofractures and foreshocks in the NW and SE quadrants and increasing considerably the shear stress within the asperity, leading to the NS striking mainshock.
Citation: Bonafede, M., C. Ferrari, F. Maccaferri, and R. Stefansson (2007), On the preparatory processes of the M6.6 earthquake of June 17th, 2000, in Iceland, Geophys. Res. Lett., 34, LXXXXX, doi:10.1029/2007GL031391
Franciscus Bonafede
No full textBotanico: Bonafede, Francesco (1474-1558).
Primo lettore dei semplici e promotore della fondazione dell\u27Orto botanico dell\u27Università di Padova.
Titolo sul recto, dove compaiono anche le note manoscritte: Patavinus, n. 1474-m. 1558; Lector simplicum et Horti Patavini Promotor.
1 fotografia : gelatina a sviluppo ; 190 x 125 mm.
Vai alla scheda bibliografica: https://galileodiscovery.unipd.it/discovery/fulldisplay?context=L&vid=39UPD_INST:VU1&search_scope=MyInst_and_CI&tab=Everything&docid=alma99001568989020604
Franciscus Bonafede
No full textBotanico: Bonafede, Francesco (1474-1558).
Primo lettore dei semplici e promotore della fondazione dell\u27Orto botanico dell\u27Università di Padova.
Titolo sul recto, dove compaiono anche le note manoscritte: Patavinus, n. 1474-m. 1558; Lector simplicum et Horti Patavini Promotor.
1 fotografia : gelatina a sviluppo ; 190 x 125 mm.
Vai alla scheda bibliografica: https://galileodiscovery.unipd.it/discovery/fulldisplay?context=L&vid=39UPD_INST:VU1&search_scope=MyInst_and_CI&tab=Everything&docid=alma99001568989020604
Franciscus Bonafede
No full textBotanico: Bonafede, Francesco (1474-1558).
Primo lettore dei semplici e promotore della fondazione dell\u27Orto botanico dell\u27Università di Padova.
Titolo sul recto, dove compaiono anche le note manoscritte: Patavinus, n. 1474-m. 1558; Lector simplicum et Horti Patavini Promotor.
1 fotografia : gelatina a sviluppo ; 190 x 125 mm.
Vai alla scheda bibliografica: https://galileodiscovery.unipd.it/discovery/fulldisplay?context=L&vid=39UPD_INST:VU1&search_scope=MyInst_and_CI&tab=Everything&docid=alma99001568989020604
Artistic heritage of brothers Bonafede in Lithuania
No full textStraipsnyje pirmą kartą lietuviškoje istoriografijoje pristatoma italų kilmės XIX a. architektūrinės keramikos meistrų brolių Bonafede kūryba ir jų meninis palikimas Lietuvoje, kuris susijęs su Vilniuje, Šv. Jurgio skvere (dab. V. Kudirkos aikštė) 1865 m. iškilusia ir 1919 m. nugriauta Šv. Aleksandro Neviškio koplyčia. Dėl sąsajų su carinės Rusijos valdžios represijomis, statinys nors ir ne kartą minėtas publikacijose, tačiau nebuvo Lietuvos dailės ir architektūros tyrėjų išsamiai analizuotas. Be to, XIX a. U p.-XX a. pr. šaltiniai, kuriuose aprašoma koplyčia, nemini keraminės apdailos autorių pavardės. Atribucija tapo galima tik atradus signuotas keramines plokštes Lietuvos dailės muziejuje bei sužinojus, kad Mikniškių cerkvėje (Šalčininkų r.) saugomos šių meistrų sukurtos ikonos. Be to, svarbiu instrumentu tapo Sankt Peterburgo restauratorių bei dailėtyrininkų publikacijos, kuriose broliai Bonafede pristatomi kaip mozaikos ir meninio stiklo akademinės mokyklos pradininkai XIX a. Rusijoje. Svarbu tai, kad Vilniaus koplyčia šiems meistrams buvo jų technologinių eksperimentų įkūnijimo vieta. Čia jie pirmą kartą išbandė naują techniką, kuri, kaip vėliau paaiškėjo, visiškai pasiteisino. Reikšminiai žodžiai: Broliai Bonafede; XIX a. architektūrinė keramika; Šv. Aleksandro Neviškio koplyčia Vilniuje; Mikniškių cerkvė (Šalčininkų r.); Ikonos; Brothers Bonafede; 19th century architectural pottery; Saint Alexande r Nevsky Chapel in Vilnius; Mikniškiai church (Šalčininkai district); IconesThe article, for the first time in Lithuanian historiography, introduces the works and artistic heritage in Lithuania of the brothers of an Italian descent, XIX"' century architectural pottery masters named Bonafede. Their artistic heritage is closely connected to Saint Alexande r Nevsky Chapel, that wa s built in 1865 at a Saint Jurgis Square, Vilnius (now V. Kudirka square) and demolished in 1919. The aforementioned building, despite being numerous times mentioned in variuos publications, wa s never comprehensively analysed by Lithuanian art and architecture researchers, because of its connection with the repressions done by the tsarist Russian authorities. Furthermore, in the sources (XIX"' century second halfXX"' century first half) where the chapel is mentioned, the names of its ceramic decoration authors are never disclosed. The attribution became possible only when the signed ceramic plates were found at Lithuanian Art museum and when it was learned that the icons created by these artists are being kept at Mikniškiai church (Šalčininkai district). Furthermore, a very important aspect became the publications, made by St. Petersburg restorers and art critics in which brothers Bonafede are presented as mosaic and art glass academic school pioneers in XIXth century in Russia. A very important point is that Vilnius Chapel became a technological experimentation place for these artists. Here they for the first time used a new technique, which, as it turned out later, was very successful
Implications of stress concentration on a strike-slip fault in an elastic plate subject to basal shear stress
No full textWe consider a long strike‐slip fault in a lithosphere modelled as an elastic slab. To the base of the slab a shear stress distribution is applied which simulates the viscous drag exerted by the asthenosphere. The resulant stress on the fault plane may directly fracture the lithosphere in its brittle upper portion; alternatively it may give rise at first to a stable aseismic sliding in the lower portion. In the latter case, stress concentration due to the deep aseismic slip is the relevant feature of the pre‐seismic stress acting on the upper section of the lithosphere. The two cases are examined by use of dislocation theory and their observable effects compared. Different depths of the aseismic slip zone and the presence or absence of a uniform friction on the seismic fault are allowed for. If the model is applied to the San Andreas fault region, where a steady sliding condition actually seems to be present at shallow depth, it turns out that the slip amplitudes commonly associated with large earthquakes are consistent with average basal stress values which can be substantially lower than a few bars, a value often quoted as the steady state basal stress due to a velocity gradient in the upper asthenosphere
On strike‐slip dislocations in an elastic half space in the presence of localized distributions of strain nuclei
No full textThe Somigliana dislocation theory is applied to the study of strike‐slip faulting in an isotropic, homogeneous, elastic half space in the presence of localized distributions of strain nuclei. Vanishing shear tractions on the dislocation surface are assumed and the slip amplitude as a function of depth is derived, together with the stress drop pattern and the energy release. The results show indications that the condition of continuous stable sliding prevailing at depth along the locked sections of faults may strongly affect the slip, the stress drop and the energy release of a seismic dislocation event. Moreover, fault widths derived from dislocation models driven from underneath are greater than those evaluated from models with a uniform initial stress field and thus tend to explain in simple terms the common finding in some regions that earthquake foci are deeper than evaluated widths of dislocation surfaces
A crack model of creep processes on deep sections of faults
No full textA crack model in antiplane shear configuration is shown representing creep processes interpreted in terms of ‘viscous’ deformation of a narrow plastic layer, characterized by inhomogeneous rheological properties, embedded within a homogeneous elastic medium. The evolution in time of slip and stress over the crack plane is studied through a truncated expansion in Chebyshev polynomials, and convergence is proved to be fast in the simple examples considered. Finite‐stress solutions are found which are compatible with constitutive relations of elasto‐plastic materials and furthermore these allow us to simulate creep propagation and stress transfer between locked and unlocked fault segments. This model provides a simple interpretation of the shallow depth of the seismogenic layer observed in several areas of the world and lends itself to modelling creep processes during either post‐seismic rebound or pre‐seismic stress buildup. Stress transfer is accomplished mostly by the slow extension of the creeping section. During a seismic cycle it is envisaged that different regimes dominate over deep, intermediate and shallow sections of faults: (i) slow pre‐seismic stress build‐up accompanied by creep and stress migration toward intermediate depths; (ii) brittle fracture over shallow and intermediate sections of faults; (iii) post‐seismic rebound over intermediate and deep sections of faults. The present crack model, while providing finite‐stress solutions, allows a better understanding of how stress may accommodate at different depths over a fault plane during a seismic cycle
Selection rules for bulk piezomagnetic coefficients of isotropic titanomagnetite dispersions
No full textA thermodynamic approach is developed for piezomagnetic phenomena, linked to reversible variations of magnetic susceptivity in isotropic stressed media. In spite of the problematic interpretation of rock piezomagnetism at the microscopic level, a simple macroscopic parameterization of antiferromagnetic media is obtained, based on invariance arguments. In intrinsically isotropic media, linearity in the stress-strain relation is shown to imply linearity of the relation between induced magnetization and stress. The macroscopic piezomagnetic behaviour of a sample in the linear stress-strain regime is described by a fourth rank tensor with 2 independent coefficients only. These coefficients can be measured in the laboratory by simple uniaxial compression tests. Comparisons with experimental data on titanomagnetite bearing rocks and synthetic dispersions show that the linear approach is valid in so far as the applied stress does not exceed a few 100 bars
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