Frequency spectrum of the slug-test response in HES well M05, for an initial head displacement H0=0.2m (slug-test reference=STM5_02).
... Filtering of high-frequencyoscillations: example of processing of the slug test STM5_02 (HES well M05, initial head displacement H0=0.2m).
... High-frequencyoscillations... Filter shape in the frequency domain for ρ=0.9.
... Interpretation of high-frequencyoscillations: inertia-induced water level fluctuations in the annular space between the inner PVC casing and the outer steel casing.
... Typical slug-test responses in HES wells. (a) “Standard” overdamped response; (b) “standard” underdamped response with low-frequencyoscillations; (c) overdamped response with high-frequencyoscillations; (d) underdamped response with dual-frequencyoscillations.
Contributors:Yulia P. Emelianova, Alexander P. Kuznetsov, Ludmila V. Turukina, Igor R. Sataev, Nikolai Yu. Chernyshov
Charts of the Lyapunov exponents for the four dissipatively coupled phase oscillators on the frequency detunings parameter plane (Δ1,Δ3). Values of the parameters are μ=0.4, (а) Δ2=0.4, (b) Δ2=2.4. Resonance conditions in the chain of oscillators are shown by arrows.
... Examples of phase portraits for the system (2). (a) Two-frequency resonance regime of the type 1:3 for Δ1=−1.5, Δ2=1, μ=0.6; (b) three-frequency regime for Δ1=−1, Δ2=1, μ=0.25.
... Chart of the Lyapunov exponents for three coupled van der Pol oscillators on the frequency detunings parameter plane. Numbers correspond to cycle periods in the Poincaré section. Values of the parameters are λ=0.1,μ=0.04.
... Chart of the Lyapunov exponents for three coupled van der Pol oscillators on the frequency detunings parameter plane. Numbers correspond to cycle periods in the Poincaré section. Values of the parameters are λ=1,μ=0.4.
... Chain of van der Pol oscillators... Full synchronization area for the four phase oscillators on the frequency detunings parameter space (Δ1,Δ2,Δ3).
Contributors:Markku Penttonen, György Buzsáki
Oscillation bands form an arithmetic progression on the logarithmic scale. For each band the frequency (Hz) or period ranges are shown together with their commonly used names.
... Brain oscillators... Alpha, gamma and theta oscillations
Contributors:Lucas C. Monteiro, A.V. Dodonov
We consider the interaction between a single cavity mode and N≫1 identical qubits, assuming that any system parameter can be rapidly modulated in situ by external bias. It is shown that, for the qubits initially in the ground states, three photons can be coherently annihilated in the dispersive regime for harmonic modulation with frequency 3ω0−Ω0, where ω0 (Ω0) is the bare cavity (qubit) frequency. This phenomenon can be called “Anti-dynamical Casimir effect”, since a pair of excitations is destroyed without dissipation due to the external modulation. For the initial vacuum cavity state, three qubit excitations can also be annihilated for the modulation frequency 3Ω0−ω0.
The plots of 1H signal width for the crystalline region of polyethylene thin film on the surface of on an piezoelectric oscillator plate against oscillationfrequency in the range from 1 Hz to 2 MHz (a) and in the expanded range from 1 Hz to 100 kHz (b) at 40 °C.
... The plots of 1H signal width for the non-crystalline region of polyethylene thin film on the surface of on a piezoelectric oscillator plate against oscillationfrequency in the range from 1 Hz to 2 MHz (a) in the expanded range from 1 Hz to 100 kHz (b) at 40 °C.
... A diagram of an NMR glass tube with an piezoelectric oscillator plate. The polyethylene thin film was molten and adhered on the surface of piezoelectric oscillator plate. The oscillation of an piezoelectric oscillator plate is generated by AD alternator.
Contributors:Niko Bako, Adrijan Baric
Oscillator... Block scheme of the oscillator.
... Reference current and the oscillatorfrequency variations as a function of supply voltage and temperature obtained by simulations. (a) Reference current variation for typical (TT), slow (SS) and fast (FF) process corners with respect to the reference current at room temperature. (b) Frequency variation for typical, slow and fast corners with a supply voltage as a parameter with respect to frequency at room temperature.
... The oscillator layout.
... Supply voltage compensated frequency... Simulated oscillator output.
... Temperature compensated frequency
Contributors:L.-E. Wernersson, M. Ärlelid, M. Egard, E. Lind
Measured and simulated output power spectrum for the oscillators at Vg=0V and Vc=1.0V (left). The fundamental oscillation is at 15.71GHz. The bias stability diagram of the oscillator (right).
... Measured oscillationfrequency as a function of gate bias at Vc=2.4V. The arrows indicate the two sweep directions.
... Measured oscillator output power for varying DC gate biases. The squares represent the fundamental oscillationfrequency, the circles the 2nd harmonic and the stars the 3rd harmonic oscillation.
... Measured performance operating the oscillator as a mixer.
... Measured (circles) and simulated (squares) oscillationfrequencies for different wave-guides specified in Table 1. The data points for D are solid while C are open.
Contributors:M. Domínguez, J. Pons, J. Ricart, E. Figueras
Theory and simulation results of the normalized digital frequency fD as a function of the f0/fS ratio and ρ=0.01. The r and δ values which identify each f0/fS segment are also specified.
... Oscilloscope screen captures of resonator position, input pulses (D6), delayed comparator output (D3) and sample clock (D0), for a PDO topology with m=1 and a ‘not perfect’ frequency fS=46.093kHz (r=2).
... Pulsed digital oscillators, MEMS, Oscillators, Sigma-delta... Oscilloscope screen captures of resonator position, input pulses (D6), delayed comparator output (D3 and D1) and sample clock (D0), for a PDO topology with m=2 and the ‘perfect’ frequency fS=44.052kHz (r=2).
Contributors:Z.K. Peng, Z.Q. Lang, S.A. Billings, Y. Lu
The output frequency response of a nonlinear system.
... The restoring force of a bilinear oscillator.
... The output frequency response of a linear system.
... Bilinear oscillator... The polynomial approximation result for a bilinear oscillator
... Nonlinear output frequency response function... Bilinear oscillator model.
Dominant frequency... The first and the second dominant frequencies variation with the steam mass flux.
... The first and the second dominant frequencies variation with the water temperature.
... The dominant frequency regime map.
... Pressure oscillation... Frequency spectrums of pressure oscillation at different water temperatures and steam mass flux.
... The dominant frequencies in different measurement points by Qiu et al. .