Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 23 for “"elastica"”.
-
Constrained Buckling of Variable Length Elastica
… the buckling response of an elastic rod (the elastica) subjected to unilateral constraints under axial compression. It seeks to address two main issues: (i) the conditions that lead to the onset of instability, and (ii) the factors that define the bifurcation diagram. Two distinct classes of …
-
Measurement of Surface and Interfacial Energies between Solid Materials Using an Elastica Loop
… is to investigate a novel technique using an elastica loop to measure the work of adhesion between solid materials. Considering the range and resolution of the measured parameters, a specially designed apparatus with a precise displacement control system, an analytical balance, an optical …
-
The Effect of Adhesion on the Contact of an Elastica with a Rigid Surface
… of solids, this thesis proposes the use of a elastica. The elastica acts as an extremely flexible beam and provides a structure that will permit measurable deformation of the solid by relatively small surface attractions. The ends of the elastica are lifted, bent, and clamped vertically at an …
-
Stress rupture of unidirectional polymer matrix composites in bending at elevated temperatures
… the large deflection of buckled bars theory (elastica) and it is possible to predict with good accuracy the strain at each point of the specimen if the end-to-end distance is known. The failure process has been experimentally characterized. The formation and propagation of microbuckles leads …
-
Elastocapillarity: adhesion and large deformations of thin sheets
… for deflections with large slope: the Sticky Elastica. Starting from the classical Euler Elastica we provide numerical results for the profiles of such blisters and present asymptotic expressions that go beyond the previously known, linear, approximations. Our theoretical predictions are …
-
Eshelby-like forces in elastic structures: theory, experiments and applications
… broad applications in new weighing devices (the 'elastica arm scale'), torsional locomotion along perfectly smooth channel and configurational actuators, capable of transforming torque into propulsive force.
-
Synthesis of electric networks interconnecting PZT actuators to efficiently damp mechanical vibrations
… by Euler beam governed by the equations of an elastica, by means of piezoelectric actuators glued on every beam and interconnected each other via electrical networks.Since we believe that the most efficient way to damp mechanical vibrations by means of electrical networks, is to realize a …
-
Comparative histology and histochemistry of the vascular system in the White Plymouth Rock hen and the pit fowl hen
… muscle, fragmentation of the elastic lamina and elastica interna, and vacuolation of the tunica intima were observed in association with plaque formation. A 37.5% incidence of abdominal aortic plaques was common to both groups. Brachial arteries were found to have 50% and 16% incidence for pit …
-
Previsione della risposta sismica di edifici asimmetrici mediante il metodo statico non lineare
… e dal rapporto Rμ fra la domanda di resistenza elastica e la reale resistenza del sistema. In questa Tesi di Dottorato il metodo proposto e' stato esteso ai sistemi multipiano irregolari e ne e' stata valutata l'efficacia su un insieme di strutture intelaiate in c.a., caratterizzate da …
-
Electrical analogs for plate equations and their applications in mechanical vibration suppression by P.Z.T. actuators
… considered. In this work, the equations for the elastica and for the plate are considered and their circuital analogs are derived using their finite-difference approximation. Afterwards, the coupling between the two structures is modelled considering piezoelectric actuators uniformly distributed …
-
Two Dimensional Analysis of Vibration Isolation of Rigid Bar Supported by Buckled or Pre-bent Struts
… The struts in all cases are modeled as an elastica, and the boundary conditions are clamped/clamped for all cases. Because the purpose of the struts is to reduce unwanted vibrations, determining the displacement transmissibility of the system is the main goal of this research. …
-
Wundheilung von Vollhautdefekten durch Kombination einer autologen Keratinozyten-Fibrinkleber-Suspension (KFGS) mit einer dermalen Matrix mit und ohne Fibroblasten : ein Kurz- und Langzeitversuch am Schweinemodell
… nach 6 Monaten exzidiert. Hämatoxilin-Eosin-, Elastica-van-Gieson- und Trichrom-Färbungen wurden zum Nachweis der Histomorphologie und der Einheilung der Transplantate durchgeführt. <br>Immunhistologisch wurden Kollagen-VII und alpha-sm-Aktin Färbungen zum Nachweis der rekonstituierten, …
-
Graphene under strain. A combined continuum-atomistic approach
… carbonio. In tal modo, nell‘ambito della teoria elastica bidimensionale, sono state derivate le equazioni costitutive non lineari per il grafene e per il suo composto con l‘idrogeno, detto grafane; conseguentemente sono stati determinati per mezzo di simulazioni atomistiche tutti i relativi …
-
Restoring the Chocó: Growth and Survival of Native Chocoan Trees Using Different Propagation Methods
… and survival. Pioneer species such as Castilla elastica, Ficus tonduzii, and Cecropia sp. promoted the development of highly diverse plantations, possibly by acting as nurse species. Finally, plantations with a higher density of islands (each composed of 25 individuals) showed increased growth …
-
Discontinuities, Balance Laws, and Material Momentum
… the deformed configurations of the planar Euler elastica based on conserved quantities associated with the spatial and material symmetry of the rod is proposed. The manifestation of the balance of material momentum in seemingly unrelated fields of research, such as fracture mechanics, ideal …
-
Influenza delle caratteristiche quali-quantitative della luce da fonti artificiali sulla fisio-morfologia di piante verdi per interior landscaping
… lavorativo, a PAR costante e variabile in Ficus elastica e Dieffenbachia picta, al fine di stabilire quali possano essere le durate e le modalità di somministrazione della luce per rendere massima la fotosintesi netta riducendo al minimo i consumi energetici dovuti all’accensione delle lampade; • …
-
On The Dynamics Of Systems With Vastly Different Frequencies
… dynamics arising in a model of a thin elastica presented by Cusumano and Moon in 1995. We observe that for the corresponding experimental system, the ratio of the two natural frequencies of the system was [ALMOST EQUAL TO] 44 which can be considered to be of O (1/[epsilon]) where …
-
Modelli meccanici per l'innesco e la propagazione delle valanghe di neve
… fondamentali della Meccanica della Frattura Elastica Lineare, definendone le nozioni base – concentrazione degli sforzi, energia di frattura, tenacità – e riportando lo storico criterio energetico di Griffith. Il terzo paragrafo descrive la Geometria Frattale in maniera sintetica, …
-
Elastic Analysis of the Loop Tack Test for Pressure Sensitive Adhesives
The loop tack test measures the tack (instant grip) of an adhesive. An analytical model of this test seems to be lacking and is the subject of this research. The strip is investigated using several mathematical formulations, and the solutions are obtained numerically. The loop is created from a …
-
Cosa si potrebbe fare per monitorare e comprendere meglio l'evoluzione delle faglie dell'Etna?Monitoraggio e analisi della deformazione superficiale tramite tecniche geodetiche e topografiche comparate. Caso studio del versante orientale del vulcano Etna.
… che le coinvolge in relazione alla risposta elastica o plastica della layer coinvolto. Un altro aspetto è quello di analizzare per ogni faglia l’offset che la stessa genera tramite serie temporali PS InSar al fine di delineare lo stato di sforzo a cui è stata sottoposta la struttura nel …
Page 1 of 2