120,038 research outputs found
Some one dimensional solutions of nonlinear waves of a rate sensitive, elastoplastic material Technical report, 1 Sep. 1967 - 31 Aug. 1972
One dimensional solution of nonlinear waves of rate sensitive, elastoplastic materia
Multi-plasmon absorption in graphene
We show that graphene possesses a strong nonlinear optical response in the
form of multi-plasmon absorption, with exciting implications in classical and
quantum nonlinear optics. Specifically, we predict that graphene nano-ribbons
can be used as saturable absorbers with low saturation intensity in the
far-infrared and terahertz spectrum. Moreover, we predict that two-plasmon
absorption and extreme localization of plasmon fields in graphene nano-disks
can lead to a plasmon blockade effect, in which a single quantized plasmon
strongly suppresses the possibility of exciting a second plasmon
Decay of Z into Three Pseudoscalar Bosons
We consider the decay of the boson into three pseudoscalar bosons in a
general two-Higgs-doublet model. Assuming to be very small, and that of
the two physical neutral scalar bosons and , only couples to
through , we find the branching fraction to be negligible
for moderate values of , if there is no term in the Higgs potential; otherwise there
is no absolute bound but very large quartic couplings (beyond the validity of
perturbation theory) are needed for it to be observable.Comment: 8 pages including 1 fi
Asymptotic stabilization of the heavy top using controlled Lagrangians
In this paper we extend the previous work on the
asymptotic stabilization of pure Euler-Poincaré mechanical
systems using controlled Lagrangians to the
study of asymptotic stabilization of Euler-Poincaré mechanical
systems such as the heavy top
Reduction of Controlled Lagrangian and Hamiltonian Systems with Symmetry
We develop reduction theory for controlled Lagrangian and controlled Hamiltonian systems with symmetry. Reduction theory for these systems is needed in a variety of examples, such as a spacecraft with rotors, a heavy top with rotors, and underwater vehicle dynamics. One of our main results shows the equivalence of the method of reduced controlled Lagrangian systems and that of reduced controlled Hamiltonian systems in the case of simple mechanical systems with symmetry
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