Готові списки джерел за темами / Switching oscillation

Добірка наукової літератури з теми "Switching oscillation"

Автор: Grafiati
Опубліковано: 14 березня 2023

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Статті в журналах з теми "Switching oscillation"

1

Gu, Meiyuan, Guangyi Wang, Jingbiao Liu, Yan Liang, Yujiao Dong, and Jiajie Ying. "Dynamics of a Bistable Current-Controlled Locally-Active Memristor." International Journal of Bifurcation and Chaos 31, no. 06 (May 2021): 2130018. http://dx.doi.org/10.1142/s0218127421300184.

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Анотація:
This paper presents a novel current-controlled locally-active memristor model to reveal the switching and oscillating characteristics of locally-active devices. It is shown that the memristor has two asymptotically stable equilibrium points on its power-off plot and therefore exhibits nonvolatility. Switching from one stable equilibrium point to another is achieved by applying a suitable current pulse. The locally-active characteristic of the memristor is measured by the DC [Formula: see text]–[Formula: see text] plot. A small-signal equivalent circuit on a locally-active operating point with the bias current [Formula: see text] is constructed for describing the characteristic of the locally-active region of the memristor. A periodic oscillator circuit composed of the locally-active memristor, a compensation inductor and a resistor is proposed, whose dynamics is analyzed in detail by using the Hopf bifurcation and the zeros and poles of the impendence function of the circuit. It is found that the locally-active memristor based circuit with different current biases or different initial conditions can exhibit different dynamics such as periodic oscillation and stable equilibrium point. If an energy storage element (capacitor) is added to the periodic oscillation circuit, a chaotic oscillator is obtained, which can exhibit abundant dynamics. The oscillation mechanism of the memristor-based oscillator is analyzed via dynamic route map (DRM), showing that the memristor is an essential device for generating periodic and chaotic oscillations, and its local activity is the cause for complex oscillations.
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2

Shao, Zhu Lei. "Design of CMOS Sawtooth Wave Oscillator for Switching Power Supply." Advanced Materials Research 960-961 (June 2014): 1268–71. http://dx.doi.org/10.4028/www.scientific.net/amr.960-961.1268.

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Анотація:
Based on the CMOS technology, the sawtooth wave oscillator used in switching power supply is designed. In the condition of 27 °C and 4 V power supply voltage, the oscillation frequency of sawtooth wave oscillator is 246.61 KHz. The oscillation frequency of sawtooth wave oscillator changes between 245.94 KHz and 247.89 KHz when the power supply voltage changes between 3V and 6V. The maximum deviation is ±0.52%. From the experimental results, the sawtooth wave oscillator has good linearity, the effect of temperature and power supply to the oscillation frequency of sawtooth wave oscillator is very little. The CMOS sawtooth wave oscillator is suitable for switching power supply.
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3

Bao, Weili, and Jian-Young Wu. "Propagating Wave and Irregular Dynamics: Spatiotemporal Patterns of Cholinergic Theta Oscillations in Neocortex In Vitro." Journal of Neurophysiology 90, no. 1 (July 2003): 333–41. http://dx.doi.org/10.1152/jn.00715.2002.

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Анотація:
Neocortical “theta” oscillation (5–12 Hz) has been observed in animals and human subjects but little is known about how the oscillation is organized in the cortical intrinsic networks. Here we use voltage-sensitive dye and optical imaging to study a carbachol/bicuculline induced theta (∼8 Hz) oscillation in rat neocortical slices. The imaging has large signal-to-noise ratio, allowing us to map the phase distribution over the neocortical tissue during the oscillation. The oscillation was organized as spontaneous epochs and each epoch was composed of a “first spike,” a “regular” period (with relatively stable frequency and amplitude), and an “irregular” period (with variable frequency and amplitude) of oscillations. During each cycle of the regular oscillation, one wave of activation propagated horizontally (parallel to the cortical lamina) across the cortical section at a velocity of ∼50 mm/s. Vertically the activity was synchronized through all cortical layers. This pattern of one propagating wave associated with one oscillation cycle was seen during all the regular cycles. The oscillation frequency varied noticeably at two neighboring horizontal locations (330 μm apart), suggesting that the oscillation is locally organized and each local oscillator is about ≤300 μm wide horizontally. During irregular oscillations, the spatiotemporal patterns were complex and sometimes the vertical synchronization decomposed, suggesting a de-coupling among local oscillators. Our data suggested that neocortical theta oscillation is sustained by multiple local oscillators. The coupling regime among the oscillators may determine the spatiotemporal pattern and switching between propagating waves and irregular patterns.
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4

Yamaguchi, Tomiharu, Emiyu Ogawa, and Akinori Ueno. "Short-Time Impedance Spectroscopy Using a Mode-Switching Nonsinusoidal Oscillator: Applicability to Biological Tissues and Continuous Measurement." Sensors 21, no. 21 (October 20, 2021): 6951. http://dx.doi.org/10.3390/s21216951.

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Анотація:
Herein, we propose an impedance spectroscopy method using a mode-switching nonsinusoidal oscillator and apply this method for measuring the impedance of biological tissues and continuous impedance measurement. To obtain impedance spectra over a wide frequency range, we fabricated a novel nonsinusoidal oscillator incorporating binary counters and analog switches. This oscillator could periodically switch oscillation frequency through the mode switching of the feedback resistor. From the oscillation waveform at each oscillation frequency of this circuit (oscillator), we determined the impedance spectrum of a measured object using the discrete-time Fourier transform. Subsequently, we obtained the broad impedance spectrum of the measured object by merging odd-order harmonic spectral components up to the 19th order for each oscillation frequency. From the measured spectrum, the resistive and capacitive components of the circuit simulating bioimpedance were estimated with high accuracy. Moreover, the proposed method was used to measure the impedance of porcine myocardium; changes in the impedance spectrum of the myocardial tissue due to coagulation could be measured. Furthermore, rapid variations in the resistance value of a CdS photocell could be continuously measured using the proposed method.
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5

Liu, Huanhuan, Lijuan Liang, Li Zhang, Yao Lu, and Baoguo Chen. "Modulatory role of inhibition during language switching: Evidence from evoked and induced oscillatory activity." International Journal of Bilingualism 21, no. 1 (July 26, 2016): 57–80. http://dx.doi.org/10.1177/1367006915600800.

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Анотація:
Aims: The present study adopted the electroencephalogram (EEG) technique to investigate whether inhibition advantage could modulate different language switches, regardless of the time spent on second language learning. Design: The inhibitory control (IC) ability of 80 low-proficient Chinese (L1)-English (L2) bilinguals was assessed by the Simon task. Half of these bilinguals were then subdivided into 20 high- and 20 low-IC participants to perform switching between L1 and L2 (L1–L2 switching), and the other half were subdivided into 20 high- and 20 low-IC participants to conduct switching between L1 and Lnew (L1–Lnew switching). All participants were required to name pictures (picture naming task) in their L1 and L2/Lnew in language switching task. Data and analysis: Both response latencies and EEG data were obtained, and then evoked and induced oscillations were calculated using time–frequency analysis. Findings: The results of language switching showed similar naming latencies for L1 and L2/Lnew switch trials in the high-IC group, whereas the low-IC group showed larger naming latencies for L1 switch trials than L2/Lnew switch trials. In contrast, the high-IC group exhibited larger theta evoked and induced power for L2/Lnew switch trials than L1 switch trials at the lexical selection level, whereas the low-IC group did not. These findings indicate that inhibition advantage helps the high-IC group to suppress effectively the non-target word via recruiting bottom-up (evoked oscillation) and top-down (induced oscillation) processes. Innovation: The present study was a first attempt to provide evidence that theta oscillation indicates cross-language interference at the lexical selection level. Significance: Inhibition plays a modulatory role in language switching, which is independent of the time spent on second language learning, and such role involves bottom-up (i.e., evoked oscillation) and top-down (i.e., induced oscillation) processes which were mainly evident at the lexical selection level.
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6

Zhang, Mingsheng, Tiejun Zhou, and Zhimin Yuan. "Analysis of Switchable Spin Torque Oscillator for Microwave Assisted Magnetic Recording." Advances in Condensed Matter Physics 2015 (2015): 1–6. http://dx.doi.org/10.1155/2015/457456.

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Анотація:
A switchable spin torque oscillator (STO) with a negative magnetic anisotropy oscillation layer for microwave assisted magnetic recording is analyzed theoretically and numerically. The equations for finding the STO frequency and oscillation angle are derived from Landau-Lifshitz-Gilbert (LLG) equation with the spin torque term in spherical coordinates. The theoretical analysis shows that the STO oscillating frequency remains the same and oscillation direction reverses after the switching of the magnetization of the spin polarization layer under applied alternative magnetic field. Numerical analysis based on the derived equations shows that the oscillation angle increases with the increase of the negative anisotropy energy density (absolute value) but decreases with the increase of spin current, the polarization of conduction electrons, the saturation magnetization, and the total applied magnetic field in thezdirection. The STO frequency increases with the increase of spin current, the polarization of conduction electrons, and the negative anisotropy energy density (absolute value) but decreases with the increase of the saturation magnetization and the total applied magnetic field in thezdirection.
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7

Aboutalebi, Payam, Fares M’zoughi, Itziar Martija, Izaskun Garrido, and Aitor J. Garrido. "Switching Control Strategy for Oscillating Water Columns Based on Response Amplitude Operators for Floating Offshore Wind Turbines Stabilization." Applied Sciences 11, no. 11 (June 5, 2021): 5249. http://dx.doi.org/10.3390/app11115249.

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Анотація:
In this article, a new strategy for switching control has been proposed with the aim of reducing oscillations in floating offshore wind turbines. Such oscillations lead to a shortage in the system’s efficiency, lifespan and harvesting capability of wind and wave energies. In order to study the decreasing of undesired oscillations in the system, particularly in pitch and top tower fore-aft movements, a square-shaped platform barge equipped with four symmetric oscillating water columns has been considered. The oscillating water columns’ air flux valves allow to operate the air columns so that to control the barge movements caused by oscillatory motion of the waves. In order to design the control scheme, response amplitude operators have been used to evaluate the performance of the system for a range of wave frequency profiles. These response amplitude operators analysis makes it possible to implement a switching control strategy to adequately regulate the valves opening/closing transition. The obtained results show that the proposed controlled oscillating water column-based barge present a better performance compared to the traditional barge one. In the case study with the period of 10 s, the results indicate the significant oscillation reduction for the controlled oscillating water column-based system compared to the standard barge system by 30.8% in pitch angle and 25% in fore-aft displacement.
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8

KAO, C. H., P. Y. TSAI, W. P. LIN, and M. C. CHOU. "A SELF-OSCILLATING SWITCHING POWER AMPLIFIER." Journal of Circuits, Systems and Computers 18, no. 01 (February 2009): 67–79. http://dx.doi.org/10.1142/s0218126609004934.

Повний текст джерела
Анотація:
A self-oscillating switching power amplifier is proposed. We use feedback to reduce the output DC bias current and to produce self-oscillation. Further, filters are added in the feedback loop to reduce the quantization noise. The experimental results show that the proposed circuit has 0.25% total harmonic distortion (THD) and the efficiency of output power of 840 μW reaches 90.1% while the DC output bias current is 8 μA and the supply voltage is 1.5 V.
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9

Maltsev, S. N., V. Yu Konev, V. V. Barmin, I. V. Romanchenko, and I. A. Prudaev. "Radiopulse generation in dispersive nonlinear transmission lines with GaAs S-diodes." Journal of Physics: Conference Series 2094, no. 2 (November 1, 2021): 022065. http://dx.doi.org/10.1088/1742-6596/2094/2/022065.

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Анотація:
Abstract The article discusses the regularities that increase the efficiency of generation of microwave oscillations in nonlinear dispersive lines with commutation diodes. GaAs semiconductor structures were used as switching diodes. The results of numerical simulations and experiments are presented, showing that the amplitude of microwave oscillations in the line increases with decreasing oscillation frequency.
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10

Shimizu, Kuniyasu. "Experimental Observations of Propagating Waves and Switching Phenomena in a Coupled Bistable Oscillator System." International Journal of Bifurcation and Chaos 24, no. 12 (December 2014): 1450157. http://dx.doi.org/10.1142/s0218127414501570.

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Анотація:
In this study, we construct a circuit composed of bistable oscillators and we report the experimental observations of quasi-periodic waves propagating in the circuit and compare them with the associated numerical results. Two different types of propagating quasi-periodic waves with identical parameter sets are experimentally verified. The associated numerical results are distinguished by comparing trajectories on the phase planes and by analyzing the one-parameter bifurcation diagrams. Furthermore, the experiments reveal five different types of switching oscillations. The associated numerical results are also presented, and the stability of the switching oscillations (when constrained to an invariant subspace) is numerically investigated. We also calculate spectral distribution for one type of the switching oscillation.
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Більше джерел

Дисертації з теми "Switching oscillation"

1

Lewandowski, Przemyslaw, Samuel M. H. Luk, Chris K. P. Chan, P. T. Leung, N. H. Kwong, Rolf Binder, and Stefan Schumacher. "Directional optical switching and transistor functionality using optical parametric oscillation in a spinor polariton fluid." OPTICAL SOC AMER, 2017. http://hdl.handle.net/10150/626462.

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Анотація:
Over the past decade, spontaneously emerging patterns in the density of polaritons in semiconductor microcavities were found to be a promising candidate for all-optical switching. But recent approaches were mostly restricted to scalar fields, did not benefit from the polariton's unique spin-dependent properties, and utilized switching based on hexagon far-field patterns with 60 degrees beam switching (i.e. in the far field the beam propagation direction is switched by 60 degrees). Since hexagon far-field patterns are challenging, we present here an approach for a linearly polarized spinor field that allows for a transistor-like (e.g., crucial for cascadability) orthogonal beam switching, i.e. in the far field the beam is switched by 90 degrees. We show that switching specifications such as amplification and speed can be adjusted using only optical means. (C) 2017 Optical Society of America
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2

Ronaldson, David Campbell. "Regenerative oscillations and electrically induced bistable switching in an InSb etalon." Thesis, Heriot-Watt University, 1991. http://hdl.handle.net/10399/820.

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3

Athanasius, Germane Information Technology &amp Electrical Engineering Australian Defence Force Academy UNSW. "Robust decentralised output feedback control of interconnected grid system." Awarded by:University of New South Wales - Australian Defence Force Academy, 2008. http://handle.unsw.edu.au/1959.4/39591.

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Анотація:
The novel contribution of the thesis is the design and implementation of decentralised output feedback power system controllers for power oscillation damping (POD) over the entire operating regime of the power system. The POD controllers are designed for the linearised models of the nonlinear power system dynamics. The linearised models are combined and treated as parameter varying switched systems. The thesis contains novel results for the controller design, bumpless switching and stability analysis of such switched systems. Use of switched controllers against the present trend of having single controller helps to reduce the conservatism and to increase the uncertainty handling capability of the power system controller design. Minimax-LQG control design method is used for the controller design. Minimax-LQG control combines the advantages of both LQG and H control methods with respect to robustness and the inclusion of uncertainty and noise in the controller design. Also, minimax-LQG control allows the use of multiple integral quadratic constraints to bound the different types of uncertainties in the power system application. During switching between controllers, switching stability of the system is guaranteed by constraining the minimum time between two consecutive switchings. An expression is developed to compute the minimum time required between switchings including the effect of jumps in the states. Bumpless switching scheme is used to minimise the switching transients which occur when the controllers are switched. Another contribution of the thesis is to include the effect of on load tap changing transformers in the power system controller design. A simplified power system model linking generator and tap changing transformer dynamics is developed for this purpose and included in the controller design. The performance of the proposed linear controllers are validated by nonlinear computer simulations and through real time digital simulations. The designed controllers improve power system damping and provide uniform performance over the entire operating regime of the generator.
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4

Icli, Burcak. "Towards Autonomous Molecular Machines: Switching Coupled To An Oscillating Reaction." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/2/12608749/index.pdf.

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Анотація:
We have designed and synthesized a bistable pseudo-rotaxane carrying a fluorescent boradiazaindacene (BODIPY) unit. The intensity of the emission signal is dependent on the position of the cucurbituril (CB7) unit over the axle component. Thus, pH modulated switching of the CB7 wheel is accompanied by significant changes in the emission spectrum. Additionally, a thiosulfate-sulfite-iodate oscillating reaction which generates large amplitude pH oscillations can be carried out in the same solution. In such a solution, in response to changing pH, the position of the wheel component seems to change without outside intervention.
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5

Wang, Yin. "Self-Oscillating Unified Linearizing Modulator." Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/35915.

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Анотація:
The continuous conduction mode (CCM) boost, buck-boost and buck-boost derived pulse-width modulation dc-dc converters suffer from the large-signal control-to-output nonlinearity. Without feedback control, the large-signal control-to-output nonlinearity would lead to output overregulation and even damage the components. The control gain is defined as the ratio of output voltage to control signal. The small-signal control gain is defined as differentiating output voltage with respect to control signal. Feedback control helps to make the output trace the reference signal. A large-signal control-to-output linearity is established. Compared with open loop control, the feedback loop design is complex; and the feedback control might suffer from the instability caused by the negative small-signal control gain, which is due to the loss and parasitic in practice. Except feedback control, open loop linearization methods can also realize the large-signal control-to-output linearity. A modulatedâ ramp pulse-width modulation generator is introduced in [6]. A current source works as the control signal. A capacitor is charged by the current source, whose voltage works as the carrier and compared with a constant dc bias voltage to determine the duty cycle. When applying this method to boost, buck-boost and buck-boost derived PWM dc-dc converters, a large-signal control-to-output linearity is established. However, the control gain is dependent on the input voltage; it cannot maintain constant when input voltage varies. A feedforward pulse width modulator is introduced in [39] to realize a large-signal control-to-output linearity. The static conversion ratio is divided into numerator and denominator as the functions of duty cycle. An integrator with reset clock signal helps to determine the right timing. The control gain is ideally constant and independent of input voltage. However, the mismatch between the integrator time constant and the switching period would result in a nonlinear control gain, which is dependent on the input voltage. In the thesis work, a self-oscillating unified linearizing modulator is introduced. It first provides a unified procedure to establish a large-signal control-to-output linearity for different pulse-width modulation dc-dc converters. Feedforward is employed to mitigate the impact from line voltage. Self-oscillation is adopted to provide the internal clock signal and to determine the switching frequency. A constant control gain is obtained, independent on the input voltage or the mismatch between clock signals. The modulator is constructed by three simple and standard building blocks. With the considerations of parasitic components and loss, how to design the constant gain, which excludes the negative small-signal control gain within the entire control signal range, is analyzed and discussed. The performance of this self-oscillating unified linearizing modulator is verified by experiments. The impacts from propagation delay in practical components are taken into considerations, which improves the quality of generated signals. Combined with a boost converter, a good large-signal control-to-output linearization is demonstrated. In the future work, the small-signal control-to-output transfer function is first deduced based on the SOUL modulator. Bode plots show the unique characteristic based on the SOUL modulator compared with the conventional modulator. Next, the impacts from this unique characteristic to feedback loop design and dynamic performance are discussed.
Master of Science
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6

Kukharev, A. V., and A. L. Daniluyk. "Influence of the inverse faraday effect on switching and oscillations of magnetization in single-domain nanoparticles." Thesis, Sumy State University, 2011. http://essuir.sumdu.edu.ua/handle/123456789/20648.

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Анотація:
We have performed a numerical simulation of magnetization switching and oscillations in a ferromagnetic single-domain particle in the disk form under the influence of nanosecond laser pulses with linearly and circularly polarization. During the simulation of magnetization we have used the macrospin approximation with the generalized Landau-Lifshitz-Gilbert equation. In this model the interaction of laser with ferromagnetic metal leads to following processes: a change in energy magnetic crystallographicanisotropy and in a value of saturation magnetization, a generation of the spin-polarized current by photon pressure, an occurrence of the magnetic field induced by the magnetoopticalinverse Faraday effect in the case of circularly polarized laser. The analysis has shown that the interaction of laser pulses with a ferromagnetic nanodisk leads to change in the direction of its magnetization. This process is accompanied by magnetization oscillations with duration from units to tens of nanoseconds. As it follows from the obtained results, the main cause of magnetization switching is the reduction of magnetic anisotropy energy at heating of the structure by laser. The field of the inverse Faraday effect can lead to an increase in frequency and amplitude of this oscillations. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/20648
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7

Khan, Mohammad Asif. "Study of Magnetization Switching in Coupled Magnetic Nanostructured Systems using a Tunnel Diode Oscillator." ScholarWorks@UNO, 2018. https://scholarworks.uno.edu/honors_theses/107.

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Анотація:
Static techniques to measure different magnetic properties of coupled magnetic nanostructured systems is researched and documented with an extensive analysis of the tunnel diode oscillator (TDO). The VSM was used to obtain the major hysteresis loop for the samples and the TDO was used to measure the magnetic susceptibility. The magnetic susceptibility was employed to conceive the static critical curve. The thesis describes both equipments, VSM and TDO, that were used to obtain data for our experiments. Albeit a more comprehensive outlook on the TDO is provided. The theoretical functionality of TDO, previous successful applications for experiments, and the physical setup in the laboratory is explored. The novel addition of the double Helmholtz coil in this setup is described. The viability of replacement of the big electromagnet and the advantages of the Helmholtz coil are discussed. Magnetization dynamics in a series of FeCoB/Ru/FeCoB synthetic antiferromagnetic samples were investigated via reversible susceptibility measurements acquired through the TDO. The major hysteresis loop generated by the VSM were used to calculate the coercivity and magnetic saturation of the sample. The VSM and TDO were subsequently used to explore the magnetization switching in a di_erent coupled magnetic system, the exchange bias samples. A range of NiFe/FeMn samples were studied with varying thickness of the antiferromagnetic layer.
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8

Radu, Cosmin. "Study of Magnetization Switching in Coupled Magnetic Nanostructured Systems." ScholarWorks@UNO, 2008. http://scholarworks.uno.edu/td/894.

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Анотація:
A study of magnetization dynamics experiments in nanostructured materials using the rf susceptibility tunnel diode oscillator (TDO) method is presented along with a extensive theoretical analysis. An original, computer controlled experimental setup that measures the change in susceptibility with the variation in external magnetic field and sample temperature was constructed. The TDO-based experiment design and construction is explained in detail, showing all the elements of originality. This experimental technique has proven reliable for characterizing samples with uncoupled magnetic structure and various magnetic anisotropies like: CrO2 , FeCo/IrMn and Co/SiO2 thin films. The TDO was subsequently used to explore the magnetization switching in coupled magnetic systems, like synthetic antiferromagnet (SAF) structures. Magnetoresistive random access memory (MRAM) is an important example of devices where the use of SAF structure is essential. To support the understanding of the SAF magnetic behavior, its configuration and application are reviewed and more details are provided in an appendix. Current problems in increasing the scalability and decreasing the error rate of MRAM devices are closely connected to the switching properties of the SAF structures. Several theoretical studies that were devoted to the understanding of the concepts of SAF critical curve are reviewed. As one can notice, there was no experimental determination of SAF critical curve, due to the difficulties in characterizing a magnetic coupled structure. Depending of the coupling strength between the two ferromagnetic layers, on the SAF critical curve one distinguishes several new features, inexistent in the case of uncoupled systems. Knowing the configuration of the SAF critical curve is of great importance in order to control its switching characteristics. For the first time a method of experimentally recording the critical curve for SAF is proposed in this work. In order to overcome technological limitations, a new way of recording the critical curve by using an additional magnetic bias field was explored.
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9

Finke, Mareike. "Brain mechanisms of executive control: Event-related potentials and oscillations in schizophrenic patients and healthy controls during task-switching." Doctoral thesis, Universitat de Barcelona, 2013. http://hdl.handle.net/10803/98349.

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Анотація:
The brain's ability to represent, maintain and update contextual (task-set) information enables us to alternate successfully between different tasks. Task-set reconfiguration is required when task demands change, as goal directed behaviour has to be adjusted to the new task. Task-cueing paradigms are widely used to investigate the underlying processes which include attentional shifting from one task to the other (task-set shifting), the retrieval of goals and rules as well as the inhibition of the previously relevant (but now irrelevant) task-set. In the first study, different aspects regarding the extraction of cue information and its importance for task-switching processes were investigated. The main focus of interest were the electrophysiological modulations regarding changes in sensory cues which (1) are or are not related to a switch in task, or even (2) may not carry any task-relevant information in some trials. The process of early (task-relevant) change detection is important in order to prepare the upcoming task. The results suggest that cue-locked event-related potentials (ERPs) are not modulated due to purely sensory changes, but rather any such ERP modulations reflect a task-related process. At least three sub-processes were identified: (1) a fast detection of task-relevant changes (as early as 180 ms), (2) a process of cue-response mapping, and (3) the reloading/updating of stimulus-response mappings. Target-locked analyses revealed that non-informative cue switches do not affect task preparation in any significant way. The second study consisted of the analysis of the data from study I in the time-frequency domain in order to elucidate power changes in the alpha and theta bands. We independently manipulated (1) anticipatory task preparation by manipulating the informativeness of cues about the upcoming task, and (2) the exogenous contribution to endogenous task-set switching. This design enabled us to examine the relative contribution from exogenous cue changes upon endogenous task-set reconfiguration effects, and whether those effects depend on the presence of foreknowledge about the upcoming task. The data confirmed strong generic preparation benefits as visible in behavioural performance and both frequency bands. Task switching effects in the alpha band could be related to both goal shifting and rule activation while task switch effects in the theta band seemed related to initial task-set reconfiguration rather than task-set implementation. Strong oscillatory modulations for cue switch trials suggested an “incongruent cue-task transition” effect. Importantly, no significant effects for “task-neutral” cue switches were found. The third study aimed to investigate higher order cognitive impairments in schizophrenia. Previously, such type of deficits has been conceptualized as failures in executive control and contextual processing. Alternatively, disturbances in high-order cognitive functions might also be due to more delimited deficits, especially in lower-level stages of contextual processing. Moreover, early processing stages do not involve only mere sensory processing, but rather reflect interacting sensory and cognitive mechanisms. Therefore, it was deemed necessary to explore the patients' task-switching abilities by manipulating sensory updating and task-set updating orthogonally to examine the interplay between bottom-up and top-down control processes. Our results suggested that the observed impairments in task-switching behaviour in schizophrenic patients were not specifically related to anticipatory set-shifting, but derived from disrupted early sensory processes of both cue- and target-locked information, as well as from a deficit in the implementation of task-set representations at target onset in the presence of irrelevant and conflicting information.
Esta tesis tuvo como objetivo investigar los procesos de cambio de tarea en pacientes esquizofrénicos y controles sanos mediante un paradigma de cambio de tarea con indicadores explícitos. El estudio I examinó el uso de conocimiento previo durante el cambio de tarea, manipulando la actualización sensorial y el control ejecutivo en ensayos con indicadores informativos y no-informativos. Los cambios sensoriales en el estímulo indicador modularon los potenciales evocados (PEs) asociados al indicador sólo cuando contuvieron información conceptual sobre la tarea. La preparación para la tarea facilitó una re-asignación estímulo-respuesta ante el estímulo diana, suscitando respuestas más rápidas en todos los ensayos repetitivos. Los resultados apoyan la hipótesis de una detección rápida de los cambios sensoriales (del indicador) cuando éstos son relevantes para la tarea, y son contrarios a los beneficios por repetición de tarea debidos a una preparación (priming) perceptiva por repetición. El segundo estudio examinó las modulaciones en las oscilaciones neuronales en las bandas alfa y theta de los datos del estudio I. Los resultados también revelaron importantes beneficios en la ejecución conductual. En los ensayos de cambio de tarea durante la actualización y la implementación de la tarea, el ritmo alfa estuvo relacionado con ambos procesos evocados por el indicador sensorial y el estímulo diana, respectivamente. Por el contrario, el ritmo theta estuvo más relacionado con las etapas iniciales de la preparación de tarea. Estos dos estudios refuerzan la hipótesis de que las modulaciones en la actividad cerebral asociadas a un cambio del indicador de tarea no son provocadas por un cambio sensorial simple, sino que están relacionadas con un cambio de meta de orden superior. En el tercer estudio un protocolo de cambio de tarea con indicador explícito fue administrado a un grupo de pacientes esquizofrénicos y comparado con una muestra control sana. Los resultados sugieren que las alteraciones observadas en la conducta de cambio de tarea no estuvieron relacionadas específicamente con una reconfiguración estímulo-respuesta de orden superior, sino a un déficit en la implementación de dicha representación configuracional de la tarea durante la presentación del estímulo diana en presencia de información irrelevante y conflictiva.
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Lanz, B. (Brigitte). "Compact current pulse-pumped GaAs–AlGaAs laser diode structures for generating high peak-power (1–50 watt) picosecond-range single optical pulses." Doctoral thesis, Oulun yliopisto, 2016. http://urn.fi/urn:isbn:9789526213569.

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Abstract Although gain-switching is a simple, well-established technique for obtaining ultrashort optical pulses generated with laser diodes, the optical energy in a pulse achievable from commercial structures using this technique is no more than moderate and the ‘spiking’ behaviour seen at turn-on is likely to evolve into trailing oscillations. This thesis investigates, develops and improves laser diodes in order to offer experimentally verified solutions for maximizing the optical energy so as to achieve a peak power of several watts in a single optical pulse of picosecond-range duration in the gain-switching operation regime, and for suppressing the energy located in any trailing pulses to a negligible level relative to the total optical pulse energy. This was addressed by means of either (i) an ultrashort pump current pulse with an amplitude range ~(1–10) A or (ii) custom laser diode structures, both options being capable of operating uncooled at room temperature (23±3°C). For the first solution a unique superfast gallium arsenide (GaAs) avalanche transistor was utilized as a switch in order to achieve an injection current pulse with a duration of < 1 ns, which is short enough to generate only a first optical ‘spike’ when pumping a commercial laser diode. The most promising structure with regard to the second solution was an edge-emitting semiconductor laser having a strongly asymmetric broadened double heterostructure with a relatively thick active layer. Laser pulses with full width at half maximum (FWHM) of ~100 ps and an optical energy of >3 nJ but with some trailing oscillations were achieved in experiments employing injection current pulses in the nanosecond range with an amplitude of ≤17 A, generated using inexpensive silicon (Si) electronics. The performance was improved by introducing a saturable absorber (SA) into the laser cavity, which suppressed the formation of trailing oscillations, resulting in a single optical pulse
Tiivistelmä ”Gain switching” (vahvistuskytkentä) on tunnettu tekniikka lyhyiden (<100 ps) optisten pulssien generoimiseen laserdiodeilla. Kaupallisia laserdiodirakenteita käyttäen optinen energia rajoittuu kuitenkin 10…100 pJ:n tasolle. Tällöinkin, erityisesti suurilla energiatasoilla, optisessa pulssissa ilmenee voimakkaita jälkioskillaatioita. Tässä väitöskirjassa tutkittiin ja kehitettiin kokeellisesti varmennettuja laserdiodilähetinrakenteita tavoitteena saavuttaa >1 nJ:n optisen pulssin energia ja ~100 ps:n pulssinpituus gain-switching -toimintamoodissa. Tavoitteena oli myös minimoida jälkipulssien energia. Tutkimuksen pääsisältönä on kaksi toimintaperiaatetta: Toisessa tekniikassa päähuomio kohdistuu laseridiodin virta-ajuriin, johon kehitettiin elektroniikka, joka kykenee tuottamaan nopeita virtapulsseja laajalla pulssivirta-alueella. Virtapulssin nopeuden kasvattamisen (<1 ns) osoitettiin edistävän gain switching -ilmiötä. Toisena tekniikkana tutkittiin räätälöityä laserdiodirakennetta, joka sisäisen toimintansa perusteella tuottaa dynaamisessa ohjaustilanteessa tehokkaan ja nopean laserpulssin. Kummankin periaatteen osoitettiin toimivan huonelämpötilassa (23±3°C) ilman erillistä jäähdytystä. Ensimmäisessä ratkaisussa käytettiin nopeaa gallium-arsenidi (GaAs) -avalanchetransistoria virtakytkimenä, jolla saavutettiin <1 ns FWHM injektiovirtapulssi 10 A:n virtatasolla. Tällainen virtapulssi on riittävän lyhyt virittämään ”gain switching” -ilmiön nJ-energiatasolla. Lupaavin rakenne toiseksi ratkaisuksi oli reunaemittoiva puolijohdelaseri, jossa epäsymmetrinen aaltoputki ja aktiivinen alue ovat sijoitettu normaalista laserdiodirakenteesta poiketen rinnakkain. Tällä rakenteella voitiin tuottaa ~100 ps levyisiä (FWHM) ja >3 nJ optisen kokonaisenergian omavia laserpulsseja edullisella pii-pohjaisella (Si) elektroniikalla luoduilla 1.5–2 ns:n (FWHM) ≤17 A injektiovirtapulsseilla. Suorituskykyä saatiin edelleen parannettua istuttamalla saturoiva absorbaattori (SA) laserin optiseen onteloon. Tämän osoitettiin vähentävän jälkioskillaatioiden muodostumista
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Книги з теми "Switching oscillation"

1

Takenaka, Norio. TB3158 - Digitally Controlled Oscillator with Clock Switching on 8-Bit PIC MCU. Microchip Technology Incorporated, 2017.

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2

Pierce, Linda. Digitally Controlled Oscillator with Clock Switching on 8-Bit PIC MCUs Tech. Brief. Microchip Technology Incorporated, 2017.

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Zhu, Juliet. Digitally Controlled Oscillator with Clock Switching on 8-Bit PIC MCUs Tech. Brief. Microchip Technology Incorporated, 2017.

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4

Shapiro, Kimron, and Simon Hanslmayr. The Role of Brain Oscillations in the Temporal Limits of Attention. Edited by Anna C. (Kia) Nobre and Sabine Kastner. Oxford University Press, 2014. http://dx.doi.org/10.1093/oxfordhb/9780199675111.013.037.

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Attention is the ubiquitous construct referring to the ability of the brain to focus resources on a subset of perceptual input which it is trying to process for a response. Attention has for a long time been studied with reference to its distribution across space where, for example, visual input from an attentionally monitored location is given preference over non-monitored (i.e. attended) locations. More recently, attention has been studied for its ability to select targets from among rapidly, sequentially presented non-targets at a fixed location, e.g. in visual space. The present chapter explores this latter function of attention for its relevance to behaviour. In so doing, it highlights what is becoming one of the most popular approaches to studying communication across the brain—oscillations—at various frequency ranges. In particular the authors discuss the alpha frequency band (8–12 Hz), where recent evidence points to an important role in the switching between processing external vs. internal events.
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Частини книг з теми "Switching oscillation"

1

Xu, Gongde, Yuanyuan Sun, Zhenguang Liang, Zhen Liu, Lisheng Li, and Yang Liu. "Study on the Influence of Parasitic Parameters on the Switching Characteristics and High Frequency Oscillation of SiC MOSFET." In Lecture Notes in Electrical Engineering, 3–10. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1922-0_1.

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2

Babaie, Masoud, Mina Shahmohammadi, and Robert Bogdan Staszewski. "A Switching Current-Source Oscillator." In RF CMOS Oscillators for Modern Wireless Applications, 123–59. New York: River Publishers, 2022. http://dx.doi.org/10.1201/9781003339311-6.

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3

Okamoto, Hiroshi, and Kazuhisa Ichikawa. "Amplification of Switching Characteristics of Biochemical-Reaction Networks Involving Ca2+/Calmodulin-Dependent Protein Kinase II: Implication for LTP Induced by a Single Burst during the Theta Oscillation." In Information Processing in Cells and Tissues, 125–36. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-5345-8_14.

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4

Bolzern, Paolo, Patrizio Colaneri, and José Claudio Geromel. "Optimal Switching of 1-DOF Oscillating Systems." In Hybrid Systems: Computation and Control, 118–30. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71493-4_12.

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5

Luo, Albert C. J., and Yu Guo. "Switching and Stick Motions in an Extended Fermi-Acceleration Oscillator." In Vibro-Impact Dynamics of Ocean Systems and Related Problems, 179–89. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-00629-6_18.

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6

Ashwin, Peter, Gábor Orosz, and Jon Borresen. "Heteroclinic Switching in Coupled Oscillator Networks: Dynamics on Odd Graphs." In Understanding Complex Systems, 31–50. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-04629-2_3.

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7

Raman, Ashish, Vikas Kumar Malav, Ravi Ranjan, and R. K. Sarin. "A Low-Power Hybrid VS-CNTFET-CMOS Ring Voltage-Controlled Oscillator Using Current Starved Power Switching Technology." In Energy Systems in Electrical Engineering, 173–202. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-7937-0_10.

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8

MAEDA, A., T. FURUYAMA, K. UCHINOKURA, and S. TANAKA. "SWITCHING AND INTERMITTENT OSCILLATIONS IN K0.3MoO3." In Proceedings of the Yamada Conference XV on Physics and Chemistry of Quasi One-Dimensional Conductors, 123–25. Elsevier, 1986. http://dx.doi.org/10.1016/b978-1-4832-2812-9.50038-0.

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9

Khan, Laiq, and Rabiah Badar. "Hybrid Adaptive NeuroFuzzy Bspline Based SSSC Damping Control Paradigm." In Handbook of Research on Novel Soft Computing Intelligent Algorithms, 787–828. IGI Global, 2014. http://dx.doi.org/10.4018/978-1-4666-4450-2.ch026.

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This work explores the potential of Bspline based Adaptive NeuroFuzzy Wavelet control to damp low frequency power system oscillations using Static Synchronous Series Compensator (SSSC). A comparison of direct and indirect adaptive control based on Hybrid Adaptive Bspline Wavelet Control (ABSWC) is presented by introducing the online identification block. ABSWC with Identification (ABSWCI) provides the sensitivity information of the plant to control system. The parameters of the control and identification block are updated online using gradient descent based back propagation algorithm. The robustness of the proposed control algorithm has been evaluated for local and inter-area modes of oscillations using different faults. The nonlinear time domain simulation results have been analyzed on the basis of different performance indices and time-frequency representation showing that ABSWC effectively damps low frequency oscillations and incorporation of online identification optimizes the control system performance in terms of control effort which reduces the switching losses of the converter.
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10

Li, Bo, Zhendong Peng, Pengfei Xie, and Zhigang Ren. "A Forced Commutation Breaking Method of Dc Circuit Breaker Taking Account of Load Current Occasions." In Advances in Transdisciplinary Engineering. IOS Press, 2022. http://dx.doi.org/10.3233/atde220021.

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In the DC power system, the circuit breaker must not only complete the rapid disconnection and isolation of the high short-circuit fault current, but also undertake the frequent switching tasks of the small load rated current. First of all, this research adopts the topological structure of double-breaker series connection and introduction of auxiliary oscillating branch on the basis of forced commutation.Different control strategies can be adopted according to different current levels, which can realize the rapid breaking of small currents while improving high current breaking performance.Secondly, through the mathematical analysis of the working process of the circuit structure, and based on the PSCAD/EMTDC electromagnetic transient simulation software, the influence of different branch parameters on the breaking process is analyzed, and the circuit parameter optimization design is carried out for the breaking process of different load current levels.
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Тези доповідей конференцій з теми "Switching oscillation"

1

Sahlén, Olof, Magnus Öberg, and Stefan Nilsson. "One gigabit per second wavelength filtering with Distributed Bragg Reflector laser filters in two-channel system experiments." In Photonic Switching. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/phs.1991.wa4.

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To fully exploit the advantages of optics for switching applications, the wavelength dimension should be utilised. An optimum photonic switching architecture probably combines optical space and wavelength switching with electronic time switching. Tunable emitters and tunable optical filters are key devices for developing such systems. A category of devices that are particularly interesting is the one comprising tunable laser diodes, that can be operated either as emitters (when biased above the oscillation threshold) or as narrowband filters (biased below the threshold). Filtering has previously been demonstrated in tunable two-section Fabry-Perot lasers [1], in tunable multi-section DFB lasers [2], [3] and in tunable two-section DBR lasers [4].
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2

Noda, Susumu, Toru Takayama, Kimitaka Shibata, and Akio Sasaki. "Photonic Switching Device by Integration of Heterojunction Phototransistor and Laser Diode." In Photonic Switching. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/phs.1991.fc3.

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There is an increasing interest in optical information processing and optical computing. In the fields, various optical functional devices such as a photonic switch and an optical amplifier are greatly demanded. Thus far, we have demonstrated that these optical functional devices can be achieved by the vertical and direct integration of electronic and optical devices such as a heterojunction phototransistor (HPT) and a light-emitting diode (LED).[1,2] Since the optical device at the output side was an LED, the optical gain and the output power were small. To improve the optical gain, a laser diode (LD) must be utilized for the optical device. Furthermore, the additional attractive features due to the lasing oscillation can be expected.
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3

Wu, Yuying, Ning He, Lingqiang Yu, Dehong Xu, Seiki Igarashi, and Tatsuhiko Fujihira. "Effectiveness Analysis of SiC MOSFET Switching Oscillation Damping." In 2020 IEEE 9th International Power Electronics and Motion Control Conference (IPEMC2020-ECCE Asia). IEEE, 2020. http://dx.doi.org/10.1109/ipemc-ecceasia48364.2020.9367969.

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4

Kwong, Sze-Keung, and Amnon Yariv. "Bistable oscillations with a passive phase conjugator." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1985. http://dx.doi.org/10.1364/oam.1985.thu3.

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When a passive phase conjugate mirror (PPCM) is conjugating an incident beam, a phase conjugate oscillation can be obtained by placing a mirror near to the PPCM. By placing an additional mirror adjacent to the first mirror, two oscillations can be observed. If we consider these two oscillations as two states of the system, the system exhibits interesting bistable behavior: the presence of one oscillation will prevent the other oscillation building up and vice versa. The system will remain in that state unless it is being disturbed, for example, blocking the oscillation by a piece of paper, then the system switches to the other state and remains in that state even after that piece of paper is removed. The switching between states can also be controlled by an external control beam. A theoretical model based on the threshold of oscillation is proposed. This device has potential application in bistable switches and associative memories.
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5

Chan, H. B., and C. Stambaugh. "Activated switching between two driven oscillation states in a nonlinear micromechanical oscillator (Invited Paper)." In SPIE Third International Symposium on Fluctuations and Noise, edited by Janos A. Bergou, Janusz M. Smulko, Mark I. Dykman, and Lijun Wang. SPIE, 2005. http://dx.doi.org/10.1117/12.611829.

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6

Fujihira, T., T. Yamada, Y. Minoya, T. Kobayashi, Y. Niimura, T. Kuboyama, R. Araki, and H. Ota. "New Oscillation Circuit Discovered in Switching-Mode Power Supplies." In IC's (ISPSD). IEEE, 2008. http://dx.doi.org/10.1109/ispsd.2008.4538931.

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7

Fodor, Szabolcs, Carlos Vázquez, Leonid Freidovich, and Nariman Sepehri. "Towards Oscillation Reduction in Forestry Cranes." In BATH/ASME 2016 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/fpmc2016-1792.

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Smooth operation of heavy-duty forestry cranes is not an easy task for the operators with the current joystick-based control method that is complex and non-intuitive. Moreover, abrupt movements of the same joysticks provoke aggressive signals that can lead to oscillatory motions in the actuators and in the entire crane. These oscillations, not only contribute to wear of the joint actuators but also can cause damage to both the operators and the environment; therefore, they must be attenuated. The proposed approach in this paper uses the popular input shaping control technique combined with a practical switching logic to deal with different frequency payload oscillations induced by the motion of the inner boom actuator of a forwarder crane. The results show a significant improvement in terms of visible oscillation reduction monitored through their appearance in the torque signal computed from pressure measurements. Experiments performed on a down-sized forestry crane verifies the effectiveness of the approach.
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8

Khelfaoui, Rachid, Ste´phane Colin, Robert Caen, Ste´phane Orieux, and Lucien Baldas. "Numerical and Experimental Analysis of Monostable Mini- and Micro-Oscillators." In ASME 2007 5th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2007. http://dx.doi.org/10.1115/icnmm2007-30126.

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An asymmetric micro-oscillator design based on a monostable fluidic amplifier is proposed. Experimental data with various feedback loop configurations point out that the main effect responsible for the oscillation is a capacitive and not a propagative effect. Actually, sound propagation in the feedback loop only generates a secondary oscillation which is not strong enough to provoke the jet switching. Data from a hybrid simulation using a commercial CFD code and a simple analytical model are in good agreement with the experimental data. A more compact plane design with reduced feedback loop volumes is also studied through a fully CFD simulation that confirms the previous conclusions.
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9

He, Mingzhi, Jianping Xu, Guohua Zhou, and Ni Chen. "Investigation of Subharmonic Oscillation of Digital Control Switching DC-DC Converters." In 2007 IEEE International Symposium on Industrial Electronics. IEEE, 2007. http://dx.doi.org/10.1109/isie.2007.4374691.

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El Aroudi, Abdelali. "Prediction of subharmonic oscillation in switching regulators with integrative feedback loops." In 2016 IEEE International Symposium on Circuits and Systems (ISCAS). IEEE, 2016. http://dx.doi.org/10.1109/iscas.2016.7527265.

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