9,113,277 research outputs found
Conservative systems showing instability in tension
No full textWithin the framework of a second-order theory, the stability of a straight beam, hinged at one end and supported at an intermediate point, is studied. Two different tensile loading conditions are applied to the beam, causing bifurcation and instability. A new analogy is shown between one of these stability problems and the elastic circular arch problem on spring soil with negative stiffness. The relationship between the results presented here and those presented in Gajewski and Palej (1974), in Zaccaria et al. (2011), and in Feriani and Carini (2017) is shown
On the stability of elastic structures subjected to follower forces
No full textWithin the framework of a second-order theory, this study revisits classical stability problems characterized by critical loads associated with dynamic instability, previously explored by Feriani and Carini (in: Zingoni (ed) Insights and innovations in structural engineering, mechanics and computation, 2016) . The primary focus remains on systems exclusively comprising a single lumped mass. This simplification, together with the assumption of a negligible axial strain and the adoption of a second-order theory, reduces the analysed systems to problems featuring a single Lagrangian coordinate. Consequently, static methods become applicable, facilitating the derivation of analytical expressions for stiffness coefficients and enabling an investigation into dynamic stability. The study begins by examining a well-established case: a cantilever beam with a lumped mass positioned at its free end, subjected to a follower load, as presented in Panovko and Gubanova (Stability and oscillations of elastic systems: models, paradoxes and errors, Nunka Press, Moscow, 1967). In this current work, a novel lumped mass system is explored. The system consists of a straight-axis beam characterized by a constant cross-section area and stiffness. The distributed mass of the beam is neglected and the beam is hinged at one end, simply supported at an intermediate point, and left free at the other end, where a lumped mass is introduced. Various loading scenarios are scrutinized, including: (a) The application of a follower force to the free end; (b) The imposition of two forces-one conservative and one follower-both applied to the free end; and (c) The application of a uniformly distributed follower force along the length of the beam. As seen in the examples introduced in Feriani and Carini (2016), the new examples considered in the present paper reveal that the first asymptote of the stiffness coefficient corresponds to the critical load. This critical load corresponds to the phenomenon known as divergence at infinity, as described by Felippa (Nonlinear finite element methods, 2014). It is also confirmed that, in all cases, the first dynamical critical load equals the minimum value between the static buckling load of the original structure and the static buckling load of an auxiliary structure. This last differs from the original one because the concentrated mass is replaced by a constraint fixing the corresponding Lagrangian coordinate
Carini relic DNA temporal data.zip
No full textAssociated sequencing and soil characteristics files for the manuscript titled "Unraveling
the effects of spatial variability and relic DNA on the temporal dynamics of soil
microbial communities" by Carini, et al.There are five files in the .zip archive:1) Demultiplexed forward sequencing reads for 16S rRNA gene amplicons2) Demultiplexed reverse sequencing reads for 16S rRNA gene amplicons3) Demultiplexed forward sequencing reads for fungal internal transcribed spacer (ITS) gene region amplicons4) Demultiplexed reverse sequencing reads for fungal internal transcribed spacer (ITS) gene region amplicons5) Map file for the sequencing reads that includes data on sampling time, sub-plot number (Rep), treatment (PMA or not) measured soil and environmental characteristics</div
Oral History Interview with Antionette Carini, April 20, 1991
No full textAntoinette Carini was born and raised in Milwaukee’s Third Ward. Her grandparents were born in Porticello, Italy, and came to Milwaukee at the turn of the century. She talks of her grandparent’s tavern, her family’s life during the Great Depression, and the lifestyle of the old Italian community in Milwaukee
Semblanza de F & G Editores (Guatemala, 1994- )
No full textSemblanza de la editorial F&G Editores en Biblioteca Virtual Miguel de Cervantes - Portal Editores y Editoriales Iberoamericanos (siglos XIX-XXI)
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Time domain analytical bounds to the homogenized viscous kernels of linear viscoelastic composites
No full textNew extremum principles in linear viscoelasticity are derived from general stationarity ones proposed in Carini and Mattei (2015), exploiting suitable selections of the admissible fields in the associated convolutive functionals. These new extremum principles have therefore a restricted validity. Analytical bounds to the homogenized viscous kernels of linear viscoelastic composites are derived in the time domain. In the restricted case of macroscopically isotropic composite materials, six new bounds are obtained from the new extremum principles. These bounds can be derived exploiting the choice of Representative Volume Elements (RVEs) loaded in a purely deviatoric way only. Two strict lower bounds to the homogenized viscous kernels, of the Reuss type, are also derived. One of these was already proposed in Huet (1995), and is valid for generic linear viscoelastic composites under general stress and strain states. The other Reuss-type strict lower bound is new, but has the same limited validity as the first six ones. The new upper bounds for isotropic composites, obtained both in terms of viscous kernels and of their time rates, as well as the strict lower bounds, are extensions to viscoelasticity of the Voigt and Reuss bounds for linear elastic composites. The performance of the obtained bounds is checked by comparison with numerical solutions. It is worth remarking that the use of the new extremum theorems for the purpose of deriving bounds is not possible in a general RVE stress case, i.e., deviatoric plus volumetric. As a consequence, the non-strict bounds holding for the case of deviatoric RVE loading are not valid for the volumetric case. The reason for this difference is not yet fully understood
Premessa al volume: Il cubicolo X13 nella catacomba di Villagrazia di Carini. Indagini preliminari e interventi di consolidamento 2016-2019
No full textThis book is dedicated to the archaeological excavations and to the consolidation of the structures of cubicle X13 in the catacomb of Villagrazia di Carini (PA). In 2015 the interesting funerary chamber was seriously damaged by the collapse of the ceiling; from 2016 to 2019, the realization of the recovery and restoration project by the Pontificia Commissione di Archeologia Sacra has been the occasion for the study of the rock-cut architectures and of the structural characteristics of the cubicle, one of the most remarkable private funerary spaces in the Early Christian and byzantine cemetery of Carini
Storia e memoria in Yo el Supremo di Augusto Roa Bastos
No full textYo el Supremo è uno dei romanzi che meglio hanno definito i decenni durante i quali l’America Latina ha visto susseguirsi al potere dittatori e regimi militari. Argomento principale del romanzo è la ricerca del potere assoluto da parte di Gaspar Rodríguez de Francia, uno tra i dittatori più longevi della storia dell’America Latina, capo assoluto e indiscusso del Paraguay dal 1814 al 1840. L’analisi proposta vuole mettere in risalto le caratteristiche del romanzo nei suoi rapporti con la ricostruzione della storia e della memoria tanto paraguaiana come collettiva di tutta l’America Latina. Il testo si compone di tre capitoli: il primo è interamente dedicato a presentare la figura dell’autore e ad approfondirne certi elementi che ne caratterizzano la narrativa. - See more at: http://www.ledizioni.it/prodotto/sara-carini-storia-memoria-yo-el-supremo-augusto-roa-bastos/#sthash.2gYEvYWn.dpu
Virginia Carini Dainotti direttrice della Biblioteca Governativa di Cremona (1936-1942)
No full textL'attività di Virginia Carini Dinotti come direttrice della biblioteca di Cremona, di cui curò il trasferimento e la ristrutturazione funzionale della nuova sed
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