We study nanomechanical resonators with frequency fluctuations due to diffusion of absorbed particles. The diffusion depends on the vibration amplitude through inertial effect. We find that, if the diffusion coefficient D is sufficiently large, the resonator response to periodic driving displays bistability. The lifetime of the coexisting vibrational states exponentially increases with increasi...

The paper presents unified analytical solution for combining high-frequency and low-frequency economic time-series by additive and proportional Denton methods with parametrical dependence on the initial values of variable and indicator in evident form. This solution spans Denton’s original and Cholette’s advanced benchmarking initial conditions as the subcases. Computational complexity of the o...

In frequency-domain optical tomography (FDOT) the quality of the reconstruction result is affected by the choice of the source-modulation frequency. In general the accuracy of the reconstructed image should improve as the source-modulation frequency increases. However, this is only true for noise-free data. Experimental data is typically corrupted by noise and the accuracy is compromised. Assum...

Using a sample with a split back-gate, a linear frequency dependence of the ac quantum Hall resistance was observed. The frequency coefficient, which is due to dielectric losses produced by leakage current between the 2DEG and the back-gates, can be turned from a positive to a negative values by increasing the back-gate voltage. More interestingly, by removing theses back-gates, the losses can ...

In this work, a computer optimization model has been developed that allows one to load the initial data of observations supernovae 1a into table and, in simple steps, by searching for best fit between and theory, obtain values parameters cosmological models. The is carried out assuming absolute magnitude not constant, but evolves with time. It assumed dependence on redshift linear: M = M( z 0) ...

Cold neutron spectroscopy was performed on CeNi1−xCuxSn to investigate how the magnetic gap in the ’Kondo insulator’ CeNiSn is destroyed by temperature (T ), chemical substitution (x), and external magnetic field. Upon doping, the spin gap collapses and magnetic Bragg peaks occur initially (x = 0.13) at the commensurate wave vectors Q = (0,m/2,l) (m,l integer) where the higher-energy (4.1 meV) ...

presented in Fig. 3(b). Weber and Seavey' have measured the uniform resonance nuclear relaxation rates in RbMnF, over the dc field range of 6-23.5 kOe at T=4.2 K. They observed a similar frequency dependence of these rates to the dependence shown ln Flg. 3(a), namely, a decrease in magnitude with increasing magnon frequency. By extrapolating their results to the frequency range presented in the...

Dynamic properties of n-alkyl monolayers covalently bonded to Si(111) were studied by broadband admittance spectroscopy as a function of the temperature and the applied voltage using rectifying Hg/C12H25/n-type Si junctions. Partial substitution of methyl end groups by polar (carboxylic acid) moieties was used to enhance the chain end relaxation response. Two thermally activated dissipation mec...