We study a superconducting stripline resonator SSR made of niobium, which is integrated with a superconducting interference device SQUID . The large nonlinear inductance of the SQUID gives rise to a strong Kerr nonlinearity in the response of the SSR, which in turn results in strong coupling between different modes of the SSR. We experimentally demonstrate that such intermode coupling gives ris...

An experimental study of an influence a strong low-frequency wave on the propagation weak ultrasonic pulses in acoustic resonator made annealed polycrystalline copper has been carried out. The measurements were out with harmonic excitation at its first four longitudinal modes range from 2 to 15 kHz, frequency varied 65 400 kHz. analysis observed nonlinear effects was within framework polycrysta...

Combined with all density-dependent factors, the per capita growth rate of a species may be nonmonotonic. One important consequence is that species may suffer from weak Allee effects or strong Allee effects. In this paper, we study the permanence of a discrete-time two-species-interaction model with non-monotonic per capita growth rates for the first time. By using the average Lyapunov function...

The presence of nonlinear influences in the relationship between stock returns and the macroeconomy is examined for six countries. The markets chosen are Canada, France, Germany, Japan, U.K. and the U.S. Nonlinearity is accounted for via regime switching using a smooth transition regression (STR) model with the world market return as the transition variable. There is evidence of nonlinearity in...

Density-wave patterns in discrete media with local interactions are known to be unstable. We demonstrate that stable double- and triple-period patterns (DPPs and TPPs), with respect to the period of the underlying lattice, exist in media with nonlocal nonlinearity. This is shown in detail for dipolar Bose-Einstein condensates, loaded into a deep one-dimensional optical lattice. The DPP and TPP ...

We study numerically the coupling between a qubit and a Bose-Einstein condensate (BEC) moving in a kicked optical lattice, using Gross-Pitaevskii equation. In the regime where the BEC size is smaller than the lattice period, the chaotic dynamics of the BEC is effectively controlled by the qubit state. The feedback effects of the nonlinear chaotic BEC dynamics preserve the coherence and purity o...

A model of nonlinearity of the contact between the vibrator baseplate and the ground is proposed to describe the distortion of vibroseis signals in the near-field. A thin layer between the baseplate and the soil exhibits a strong nonlinear response because of the difference in its rigidity between the compression and tension phases. The model allows for a quantitative description of the transmi...

In the acoustic frequency range, the mammalian middle ear is known to behave as a fairly linear system. However, strong nonlinearity has been demonstrated in response to quasi-static pressure loads, and in previous work our research group was able to detect small nonlinear distortions at sound pressure levels of 96 dB SPL in the vibrations of the gerbil’s tympanic membrane. The tympanic membran...

Plasmonic devices have a unique ability to concentrate and convert optical energy into a small volume. There is a tremendous interest in achieving active control of plasmon resonances, which would enable switchable hotspots for applications such as surface-enhanced spectroscopy and single molecule emission. The small footprint and strong-field confinement of plasmonic nanoantennas also holds gr...

The role of long-range strain interactions on domain wall dynamics is explored through macroscopic and local measurements of nonlinear behavior in mechanically clamped and released polycrystalline lead zirconate-titanate (PZT) films. Released films show a dramatic change in the global dielectric nonlinearity and its frequency dependence as a function of mechanical clamping. Furthermore, we obse...