Zobrazeno 1 - 10
of 79
pro vyhledávání: '"Malta, C. P."'
Autor:
da Fonseca, Alexandre F., Malta, C. P.
Real filaments are not perfectly homogeneous. Most of them have various materials composition and shapes making their stiffnesses not constant along the arclength. We investigate the existence of circular and helical equilibrium solutions of an intri
Externí odkaz:
http://arxiv.org/abs/physics/0607132
Publikováno v:
Nanotechnology 17, 5620-5626 (2006)
Helical amorphous nanosprings have attracted particular interest due to their special mechanical properties. In this work we present a simple model, within the framework of the Kirchhoff rod model, for investigating the structural properties of nanos
Externí odkaz:
http://arxiv.org/abs/cond-mat/0607291
Publikováno v:
Nanotechnology 18 (2007) 435606
Nanosprings have been object of intense investigations in recent years. They can be classified as normal or binormal depending on the geometry of their cross-section. Normal amorphous nanosprings have not been observed experimentally up to now, and o
Externí odkaz:
http://arxiv.org/abs/cond-mat/0507400
Autor:
da Fonseca, Alexandre F., Malta, C. P.
Helical configurations of inhomogeneous symmetric rods with non-constant bending and twisting stiffness are studied within the framework of the Kirchhoff rod model. From the static Kirchhoff equations, we obtain a set of differential equations for th
Externí odkaz:
http://arxiv.org/abs/physics/0507105
Publikováno v:
Journal of Applied Physics 99, 094310 (2006)
We present a model to study Young's modulus and Poisson's ratio of the composite material of amorphous nanowires. It is an extension of the model derived by two of us [Da Fonseca and Galvao, Phys. Rev. Lett. 92, 175502 (2004)] to study the elastic pr
Externí odkaz:
http://arxiv.org/abs/cond-mat/0507317
Dalibard, Dupont-Roc and Cohen-Tannoudji (J. Physique 43 (1982) 1617; 45 (1984) 637) used the Heisenberg picture to show that the atomic transitions, and the stability of the ground state, can only be explained by introducing radiation reaction and v
Externí odkaz:
http://arxiv.org/abs/quant-ph/0409117
Autor:
da Fonseca, Alexandre F., Malta, C. P.
The tridimensional configuration and the twist density of helical rods with varying cross section radius are studied within the framework of the Kirchhoff rod model. It is shown that the twist density increases when the cross section radius decreases
Externí odkaz:
http://arxiv.org/abs/physics/0310102
Publikováno v:
Physica A 352, pp. 547--557 (2005)
We study the three-dimensional static configurations of nonhomogeneous Kirchhoff filaments with periodically varying Young's modulus. This type of variation may occur in long tandemly repeated sequences of DNA. We analyse the effects of the Young's m
Externí odkaz:
http://arxiv.org/abs/physics/0210118
We derive an exact general formalism that expresses the eigenvector and the eigenvalue dynamics as a set of coupled equations of motion in terms of the matrix elements dynamics. Combined with an appropriate model Hamiltonian, these equations are used
Externí odkaz:
http://arxiv.org/abs/quant-ph/0011054
We give an example in which it is possible to understand quantum statistics using classical concepts. This is done by studying the interaction of charged matter oscillators with the thermal and zeropoint electromagnetic fields characteristic of quant
Externí odkaz:
http://arxiv.org/abs/quant-ph/9512007