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Two-tone excitations greatly improve detection sensitivity by allowing one frequency component to reside close to (in this case) the first natural frequency for the necessary structural excitation, while the second excitation frequency component acts as a probe for highlighting changes in the response.
Enhanced dual frequency excitation method enhanced dual frequency excitation with a high frequency of 160 hz is also available as an optional feature. This ensures highly stable measurements in difficult applications such as high concentration slurries and low conductivity water.
The focus of this dissertation is the development and investigation of nested cavity mode-locked lasers and their resultant tailored frequency combs. A nested cavity is made up of two cavities, known as parents. One parent is a larger, active, 100mhz ti:saph oscillator and the other is a smaller, passive, 7ghz fabry-perot etalon (fpe).
Ing with nutations for tailored excitation (dante) allow one to improve the efficiency of the the precession frequency of the spins x0 and the carrier frequency.
Artist's impression of polarization-based excitation tailoring for extended raman spectroscopy.
It is the frequency at which body is made vibrate in forced vibration. It is like complying the body to vibrate the freqency at which the force wants whether then its natural freqency. Importance of it resonace occurs when excitation frequency is equal to natural frequency.
The generator’s operating voltage and frequency are determined by the balance between the system’s real power and the reactive power. Thus, if sensitive equipment is connected to the generator during self-excitation, the equipment may be subjected to over/under voltage and over/under frequency operation.
Controlling the frequency spectrum of an irradiating rf pulse (via tailoring) while imposing a magnetic field gradient on spins, such that only.
Purpose an iterative k-space trajectory and radio-frequency (rf) pulse design method is proposed for excitation using nonlinear gradient magnetic fields.
This technique allows you to retain the 250khz sample frequency whereas data paths can be isolated by the use of either identical or specifically tailored fir filters. This second signal could be the result of excitation of a sens.
Controlling the frequency spectrum (bandwidth) of a rf pulse (via tailoring) while imposing a magnetic field gradient on spins, such that only a desired region.
A realistic amplifier will produce additional signal content at frequencies other than the two input tones at its output.
For flight regimes such as high angle of attack or hypersonic flight, the ability to maintain flight condition for this time duration is difficult. Significantly reducing the required duration of the excitation input is possible by tailoring the input to excite only the frequency range where the lowest stability margin is expected.
Frequency-domain analysis is a powerful tool for analyzing linear systems subjected to harmonic excitation. Actually, by performing an initial fourier transform of the loading, any type of periodic excitation can be studied using frequency-response analysis.
A novel approach to tailored selective excitation for the measurement of nmr spectra in non-deuterated aqueous solutions (watergate, water suppression by gradient-tailored excitation) is described. The gradient echo sequence, which effectively combines one selective 180 degrees radiofrequency pulse.
1 jun 1992 general solutions for tailored modulation profiles in adiabatic excitation greatly on the amplitude- and frequency-modulation functions used.
Title: simultaneous multislice inversion contrast imaging using power independent of the number of slices (pins) and delays alternating with nutation for tailored excitation (dante) radio frequency pulses.
Integrator an electrical frequency filter used to convert a vibratory acceleration signal to one whose amplitude is proportional to velocity or displacement.
Sources of torsional excitation and about the modal parameters (torsional natural frequency and damping), starting from the frequency spectra of the dynamic torque, are illustrated in detail. In addition, the influences of the relative flow and of the oil viscosity, changed according to the test matrix, are investigated.
Frequency ratio this plot shows that as the driving frequency increases, the phase difference between the steady-state response and the driving force increases from 0 to pi and is equal to pi/2 (90 ) at the natural frequency of the system.
30 jul 2015 purpose tailored excitation (tex) based on interspersing multiple radio frequency pulses with linear gradient and higher‐order shim pulses.
A technique has been previously developed to significantly reduce the duration of the excitation input by tailoring the input to excite only the frequency range of interest. Reductions in test time were achieved by simultaneously applying tailored excitation signals to multiple control loops, allowing a quick estimate of the frequency response of a particular aircraft.
The excitation magnitude at the sensor must be enough so that the smallest change to be measured results in a voltage change that exceeds the noise, offset and drift of the system. If large dc errors and low-frequency noise are expected, ac excitation is useful.
It has been recently suggested that the time evolution of an incoming signal can be tailored to efficiently engage these complex zeros, implying that a specific choice of nonmonochromatic signals.
Excitation signals • the type of excitation signal used to estimate frequency response functions depends upon several factors. Generally, the excitation signal is chosen in order to minimize noise while estimating the most accurate frequency response function in the least amount of time.
A method to generate shaped radiofrequency pulses for uniform excitation of electron spins in time-domain radio frequency (rf) electron paramagnetic resonance (epr) imaging is presented. A commercial waveform generator was integrated with the transmit arm of the existing time-domain rf-epr spectrometer to generate tailored excitation pulses with sub-nano second resolution for excitation with a 90 degrees flip-angle.
Recording the emission intensity as a function of t 1 results in an interferogram, which after an ft yields the frequency-resolved excitation spectrum. Here we use a common-path interferometer ( 16 17 ) for the combined detection of time-resolved or dispersed emission with ft-based excitation spectroscopy of single emitters.
The impulse excitation technique (iet) is a non-destructive material characterization technique to determine the elastic properties and internal friction of a material of interest.
Laser pulse that is tailored in the time and frequency domains. Typically the control knobs are linear chirp, pulse duration (transform-limited pulses), and pulse intensity. Experimental demons-trations of this technique often involve multiphoton transitions.
1 sep 2018 the goal of this study is to improve the time resolution of linear chirp ultrasonic testing by employing frequency-phase-amplitude modulation.
The benefits of the 150 hz excitation frequency used in the yokogawa rotamass coriolis flow meter.
Dual excitation for stable measurement in any application 250 ma ma 0 t/ ms 80 ms 0 ms 160 ms 240 ms 320 ms enhanced dual frequency excitation current (160hz) 320 ms flowsignal from dual frequency excitation flowsignal from pulsed dc excitation lf01e00a00-11en.
Low-excitation and magnetic-loss generators absorb reactive power from the system, causing the voltage of the power system to decrease.
Gradient and frequency modulated excitation for a tailored spatial trajectory with two-dimensional time encoding for fourier-free imaging.
Parametric resonance takes place when the external excitation frequency equals twice the natural frequency of the system. Parametric excitation differs from forcing since the action appears as a time varying modification on a system parameter. The classical example of parametric resonance is that of the vertically forced pendulum.
2014) exhibit interesting frequency-dependent unusual physical properties like negative mass and negative young’s modulus in a specific regime of the excitation frequency. These idiosyncratic physical properties are caused by the out-of-phase motion of multiple resonating units simultaneously, making effective mass or effective stiffness of the designed metamaterial negative in a certain frequency range.
Tailored voltage waveforms (tvws) and the electrical asymmetry effect they an argon plasma for three-frequency operation, and for fundamental frequencies.
A method to generate shaped radiofrequency pulses for uniform excitation of electron spins in time-domain radio frequency (rf) electron paramagnetic resonance (epr) imaging is presented. A commercial waveform generator was integrated with the transmit arm of the existing time-domain rf-epr spectrometer to generate tailored excitation pulses.
Excitation concentrates the excitation energy at a single fre-quency and allows the structural response to build more than would be the case with random. Random does have the advan-tage that the time taken to make the complete frf measure-ment across the desired frequency range is very brief, but the results are less reliable.
A method for simultaneous multislice (sms) inversion contrast imaging is presented using a combination of the delays alternating with nutation for tailored excitation (dante) and the power independent of the number of slices (pins) techniques. In sms imaging, simultaneously excited slices result in an aliased image that is disentangled using parallel imaging reconstruction techniques.
Existence of discrete frequency baae has never been pre-dicted by analytic theory, although discrete frequency modes inside the low frequency gap have been found by ideal mhd eigenvalue codes such as nova [11]. This ideal mhd 3, eigenmode of thermal plasmas can then be used to calculate wave-particle energy exchanges for baae excitation by pres-.
Phase cancellation between of many bladed disc modes even when the excitation frequency is near a natural frequency. 1 blade excitation forces for any discussion about the natural frequency calculation, it is important to know about the excitation forces in the steam turbine.
The nonperiodic excitation excitation may have a long or short duration. The response of a dynamic system to suddenly applied nonperiodic excitations is called transient response. If the frequency of excitation coincides with the natural frequency of the system, the response of the system will be very large.
A method comprising: applying a sweeping frequency excitation having a duration, the sweeping frequency excitation being configured to sequentially excite isochromats having different resonant frequencies, wherein applying the sweeping frequency excitation includes applying a plurality of discrete excitation pulses; acquiring a time domain signal during the duration, the time domain signal being based on evolution of the isochromats, wherein acquiring the time domain signal includes sampling.
Spectrally tailored excitation allows the targeting of a vibrational resonance that is excited, but it does not directly improve chemical specificity over narrowband excitation because there is no mechanism to suppress signal from overlapping bands of interfering species. In ste-srs, the broadband pump spectrum is therefore shaped twice.
Tailored excitation of ions in a mass spectrometer is obtained by using an excitation signal which comprises at least one signal having the form of a sinc function modulated sine wave.
Multiple measurements of consecutive sections of excited frequency ranges a tailored excitation used to produce greater displacements.
Brain images acquired at 3t often display central brightening with spatially varying tissue contrast, caused by inhomogeneity in the transmit radiofrequency fields used for excitation. Tailored radiofrequency pulses can provide mitigation of radiofrequency field inhomogeneity, but previous designs have been unsuitable for 3d imaging in rapid pulse sequences.
Items 1 - 10 of 10 dynamic frequency selection (dfs) testing embedded wifi iso 11452-4 radio frequency (rf) generators iso 11452-4 power.
The maximum frequency for the excitation is the highest frequency desired adjusted upward so that its wavelength evenly divides the total process time: the actual number of cycles of the ending frequency (n2) and the actual ending frequency ( ) are calculated by: the input excitation can then be generated as a sum of cosines starting with three (n1).
A truncated sinc [sin (x)/x] pulse, tailored to compensate for the q-profile (rf frequency response) of the resonator, was shown to yield images from phantom objects as well as in vivo images, with minimal distortion. These studies point to the advantages in using shaped sinc pulses to achieve improved uniform excitation over a relatively wide bandwidth region in time-domain rf-epr imaging (rf-ft-epri).
Controlling the frequency spectrum of a rf pulse (via tailoring) while imposing a magnetic field gradient on spins, such that only a desired region will have an appropriate resonant frequency to be excited. Originally used to excite all but a desired region; now often used to select only a desired region, such as a plane, for excitation.
Purpose tailored excitation (tex) based on interspersing multiple radio frequency pulses with linear gradient and higher‐order shim pulses can be used to obtain uniform flip angle in the presence of large radio frequency transmission (b 1+) inhomogeneity.
The ratio of phase-to-frequency modulation in the case of fpm-afm strongly depends on the electronics of the self-excitation loop and the excitation method used to actuate the cantilever. Measuring the appropriate transfer functions of the system allows the acquired data to be properly interpreted using fpm-afm theory, presented in section iii.
Modal excitation 5 excitation signals • the type of excitation signal used to estimate frequency response functions depends upon several factors. Generally, the excitation signal is chosen in order to minimize noise while estimating the most accurate frequency response function in the least amount of time.
Recent progress in plasma science and technology has enabled the development of a new generation of stable cold non-equilibrium plasmas operating at ambient atmospheric pressure. This opens horizons for new plasma technologies, in particular in the emerging field of plasma medicine. These non-equilibrium plasmas are very efficient sources for energy transport through reactive neutral particles.
Significantly reducing the required duration of the excitation input is possible by tailoring the input to excite only the frequency range where the lowest stability margin is expected. For a multiple-input/multiple-output system, the inputs can be simultaneously applied to the control effectors by creating each excitation input with a unique set of frequency components.
The use of tailored excitation input signals provides a measurement of the system frequency response over a specified range of frequencies.
5hz, that is, 5% of the rated value is exceeded, the frequency is increased, mainly due to the limitation of the mechanical strength of the rotating machine, the frequency is high, the rotational speed of the motor is high, and the centrifugal force on the rotor is increased, which is easy to make some.
A method to generate shaped radiofrequency pulses for uniform excitation of electron spins in time-domain radio frequency (rf) electron paramagnetic.
This makes it difficult cal solutions of the equations of motion (bloch equations) for various forms of tailored pulses.
10 dec 2020 colors expanded: widely tunable lasers are tailored for quantum research emitter is measured while tuning the excitation (laser) frequency.
1 sep 2019 with the delay alternating with nutation for tailored excitation (dante) pulse lesion enhancement in radio-frequency spoiled gradient-echo.
A method of magnetic resonance is provided that uses a frequency swept excitation wherein the acquired signal is a time domain signal is provided. In one embodiment, the method comprises, applying a sweeping frequency excitation and acquiring a time domain signal.
In this paper, tailored signals are used as excitation signals to obtain a frequency domain model set of a class of plants with uncertainties. After collecting data from identification test, the chirp-z transform is adopted to calculate the discrete frequency spectra of input and output signals.
A method of magnetic resonance is provided that uses a frequency swept excitation wherein the acquired signal is a time domain signal is provided. In one embodiment, the sweeping frequency excitation has a duration and is configured to sequentially excite isochromats having different resonant frequencies.
1 feb 1996 as a result, the spectral bandwidth excited per unit field is small, and the ability to efficiently search over a broad frequency range would seem.
Response to harmonic excitation part 1 undamped systems harmonic excitation refers to a sinusoidal external force of a certain frequency applied to a system. The response of a system to harmonic excitation is a very important topic because it is encountered very commonly and also covers the concept of resonance.
The following is a step-by-step procedure for computing the notch frequency using this methodology: 1) guess an initial excitation frequency 2) compute the amplitudes b1(1) and b2(1) using the system dynamics.
A novel approach to tailored selective excitation for the measurement of nmr spectra in non-deuterated aqueous solutions (watergate, water suppression by graadient-tailored excitation) is described. The gradient echo sequence, which effectively combines one selective 180° radiofrequency pulse and two field gradient pulses, achieves highly selective and effective water suppression.
The ehx frequency analyzer adds moving harmonies to the note or chords being played.
Excitation is induced (usually by means of a monochromator) at various excitation wavelengths and the intensity of the emitted fluorescence is measured as a function of wavelength. The result is a graph or curve (illustrated in figure 1(a)), which depicts the relative fluorescence intensity produced by excitation over the spectrum of excitation.
Two steps are required to uniquely excite a slice in 2d mr imaging: (1) a slice-select gradient is imposed along an axis perpendicular to the plane of the desired slice, resulting in a linear variation of potential resonance frequencies in that direction, and (2) a specially tailored rf-pulse is simultaneously applied, whose frequency components match the narrow range of frequencies contained.
The basic idea behind the frequency sweep excitation test track is that a vehicle travelling along the test track with a constant speed will be exposed to a constant force with a changing frequency. The excitation frequency increases (or decreases) as the vehicle moves along the track.
Within a subject are first excited using a radio-frequency (rf) excitation pulse and excitation pulses need to be tailored to a user's specific needs and in most.
Resonance frequencies in that direction, and (2) a specially tailored rf-pulse is magnetic field gradient causes the center frequency (fc) of each slice to vary ideal rf-excitation to achieve this frequency profile is a so-cal.
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