Relevant bibliographies by topics / Oscillating plant

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Oscillating plant'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 February 2022

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Journal articles on the topic "Oscillating plant"

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Rose, Mary Ann, and Mark A. Rose. "Oscillatory Transpiration May Complicate Stomatal Conductance and Gas-exchange Measurements." HortScience 29, no. 6 (June 1994): 693–94. http://dx.doi.org/10.21273/hortsci.29.6.693.

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A closed-loop photosynthesis system and a heat-balance sap-flow gauge independently confirmed oscillatory transpiration in a greenhouse-grown Rosa hybrids L. Repetitive sampling revealed 60-minute synchronized oscillations in CO2-exchange rate, stomatal conductance, and whole-plant sap-flow rate. To avoid confusing cyclical plant responses with random noise in measurement, we suggest that gas-exchange protocols begin with frequent, repetitive measurements to determine whether transpiration is stable or oscillating. Single measurements of individual plants would be justified only when transpiration is steady state.
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Kourie, J. I. "Oscillation of Membrane Currents During the Action Potential in Chara corallina: Modification and Significance for Repolarisation of the Membrane Potential and Salt Sensitivity." Functional Plant Biology 23, no. 3 (1996): 361. http://dx.doi.org/10.1071/pp9960361.

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Depolarising voltage-clamp steps in C. corallina induced membrane currents which differ from those of C. inflata in two aspects: (1) The absence of a 'hump', i.e. a transient outward current,Io(max) which is present in C. inflata, and (2) the presence in C, corallina of a voltage-dependent current oscillation, i.e. a succession of decaying peaks. The peaks of the oscillating transient inward current, Ii(max), were voltage dependent and sensitive to block with 9-anthracenecarboxylic acid (9-AC). The oscillating current is carried by C1- and its time course is determined by the activation and inactivation kinetics of C1- channels. Extracellular NaCl delayed current activation, induced a voltage-dependent increase in Ii(max) and a decrease in the steady-state outward K+ current, Is. NaCl increased the occurrence of oscillation and enhanced the amplitude of the oscillating current. Extracellular sorbitol induced an overall reduction in Ii(max) and had virtually no effect on Is. I suggest that the enhancement of the oscillating transient inward CI- current, Ii(max), by NaCl is due to ionic effects of NaCl rather than to its osmotic effects.
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Chen, Yun, Jian Zhao, Guangrui Hu, and Jun Chen. "Design and Testing of a Pneumatic Oscillating Chinese Wolfberry Harvester." Horticulturae 7, no. 8 (July 29, 2021): 214. http://dx.doi.org/10.3390/horticulturae7080214.

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A pneumatic oscillating Chinese wolfberry harvester was designed to improve the efficiency of manual harvesting and minimize fruit damage by mechanical harvesting. The shedding model of Chinese wolfberry under pneumatic forces was established based on kinetic analysis, and the flow field characteristics were investigated using computational fluid dynamics (CFD). The position and shape of the fan outlet were determined by comparing the effects of a linear reduction outlet and a Laval reduction outlet on the outlet airflow rate. The size of the oscillating mechanism was optimized with nonlinear constraints to achieve uniform oscillation of the airflow. A three-factor, three-level orthogonal test was conducted on the NingQi 7 wolfberry variety. The flow rate at the outlet, the oscillation frequency, and the outlet distance were the test factors, and the net harvesting rate of ripe fruits, the harvesting rate of green fruits, and the damage rate of ripe fruits were the test indices. The results showed that the net harvesting rate of ripe fruits was 85.21% at an outlet distance of 10 cm, an outlet flow rate of 70 m·s−1, and an oscillation frequency of 2 Hz. This study provides references for the design of pneumatic harvesters for Chinese wolfberry.
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Jolibois, Nicklas, Krasimir Aleksandrov, Manuela Hauser, Dieter Stapf, Helmut Seifert, Jörg Matthes, Patrick Waibel, Markus Vogelbacher, Hubert B. Keller, and Hans-Joachim Gehrmann. "Analysis of Oscillating Combustion for NOx−Reduction in Pulverized Fuel Boilers." Inventions 6, no. 1 (January 19, 2021): 9. http://dx.doi.org/10.3390/inventions6010009.

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Thermal power plants in different fields are regularly adapted to the state-of-the-art emissions standards, applying “The Best Available Techniques Reference”. Since 2016 in the power plant area new, more stringent limits for power plant units with a thermal output of more than 300 MW operated with black coal are valid. Usually, in order to reach the new limits e.g., for NOX emissions, downstream reduction processes (Selective Non-Catalytic Reduction, SNCR or Selective Catalytic Reduction) are applied, which use of operating resources (essentially ammonia water) thereby increase. By the means of an experimentally validated process, by which pulverized fuel is fed by oscillation through a swirl burner into a pilot combustion chamber with a thermal output of 2.5 MW, nitrogen oxides can be reduced without further activities, for instance from 450 mg/mN3 in non-oscillation operation mode (0 Hz) to 280 mg/mN3 in oscillation operation mode (3.5 Hz), normalized to an O2–content of 6% each. These findings were patented in EP3084300. Particularly promising are the experiments which utilize oscillation of a large portion of the burn out air instead of the fuel in order to minimize the fatigue of the pulverized fuel oscillator, amongst others. Thereby, the nitrogen conversion rate, which describes the ratio of NOX to fuel nitrogen, including thermal NOX can be reduced from 26% for non-oscillation operation mode down to 16%. The present findings show that fuel oscillation alone is not sufficient to achieve nitrogen oxides concentrations below the legislative values. Therefore, a combination of different primary (and secondary) measures is required. This paper presents the experimental results for oscillating coal-dust firing. Furthermore, an expert model based on a multivariate regression is developed to evaluate the experimental results.
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Georgiou, Demos P., Kypros F. Milidonis, and Eleutherios N. Georgiou. "Sensitivity Analysis for the Encaged Turbine Concept in Oscillating Water Column Plants." ISRN Renewable Energy 2012 (December 20, 2012): 1–8. http://dx.doi.org/10.5402/2012/987904.

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Oscillating water column plants are one of the most popular wave energy device types. Prototype OWC units have been operating in various parts of the world since the mid-1980s and such developers have more field experience of this technology than any other relevant plant. The most common turbine used is the self-rectifying Well's turbine which has a rather low peak efficiency if compared to other designs but was preferred in terms of its simplicity and cycle performance. The present study exploits the merits of a new concept for the power extraction process, that of an encaged turbine for OWC plants, which allows conventional high-efficiency turbines to be employed in such plants. This is achieved by guiding the pressurized air into a sequence of three chambers, creating a unidirectional closed air circuit through the turbine. A theoretical model is deployed simulating the operation of the plant and a sensitivity analysis is carried out for the design and working parameters. Results indicate that the power extraction efficiency may exceed the 50% level in a real plant.
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Bulgakov, Volodymyr, Aivars Aboltins, Hristo Beloev, Volodymyr Nadykto, Volodymyr Kyurchev, Valerii Adamchuk, and Viktor Kaminskiy. "Experimental Investigation of Plow-Chopping Unit." Agriculture 11, no. 1 (January 4, 2021): 30. http://dx.doi.org/10.3390/agriculture11010030.

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The article presents research results of a machine-tractor unit that performs two technological operations simultaneously: (i) chopping plant residues (sunflower stubble); (ii) covering the chopped stubble with the soil. The first operation is carried out with a front-mounted plant residues chopper, and the second one is carried out with a rear-mounted plough. The chopper’s working devices are rotated by the tractor’s front power take-off (PTO), which has two operating modes: 540 and 1000 rpm. It was determined that to reduce the dynamic load in the drive of the chopper’s plant residues working devices, to chop these residues qualitatively, and then to cover them with the soil, the tractor’s front PTO should be adjusted to a speed of 1000 rpm. With this mode of the chopper’s working device’s rotation, the difference in its vertical vibrations’ dispersion and the tractor front axle’s oscillations is insignificant. The variance of the plowing depth vibrations (1.44 cm2), changing aperiodically in the frequency range of 0–2.5 Hz, is not accidentally less than the variance of irregularities vibrations of the longitudinal field profile (2.75 cm2). The plough draft resistant oscillations of the plow-chopping unit had the least impaction at the plowing depth oscillations. The proof of this is the small value of the cross correlation function; for such oscillating processes as ‘plough draft resistance—plowing depth’, it was equal to 0.22, which is 3.4 times less than for oscillating processes ‘surface’s longitudinal profile—plowing depth’. The number of chopped particles less than 15 cm in length increased by 1.5 times, and the number of particles longer than 30 cm decreased by 3 times. With the complete incorporation of plant residues into the soil, their non-chopped part did not exceed 1%.
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Kochergin, Victor I., Sergey P. Glushkov, and Aleksandr V. Kurmygin. "RESEARCH OF NON-UNIFORM ROTATION OF SHIP POWER PLANT ELEMENTS DRIVE." Russian Journal of Water Transport, no. 65 (November 23, 2020): 71–79. http://dx.doi.org/10.37890/jwt.vi65.129.

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This article contains the results of studies of the rotation unevenness parameters of the ship power plants elements drive. Theoretical prerequisites of such analysis are described and an example of calculation of parameters of torsional-oscillating system of high-pressure fuel pump drive and speed controller is given in the article. Calculations have shown that at the nominal crankshaft speed of the internal combustion engine, the possibility of resonant oscillations of the camshaft of the fuel pump is not excluded. Design features, faults, violation of adjustments or operating rules can contribute to the operation of elements of power plants at resonant frequencies and cause operational failures. Analysis of rotation unevenness of elements drive and additional equipment of ship's power plants is an appropriate technical measure that allows to increase the reliability of ship's power plants.
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Horntvedt, Bjarne R., Morten Rambekk, and Rune Bakke. "Oscillating conditions for influencing the composition of mixed biological cultures." Water Science and Technology 37, no. 4-5 (February 1, 1998): 259–62. http://dx.doi.org/10.2166/wst.1998.0640.

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This paper presents a strategy in which mixed biological cultures are exposed to oscillating concentration levels, to improve the potential for coexistence of desired bacterial species. A mechanistic mathematical model is constructed to investigate and illustrate this strategy. This paper is focused on competition between nitrifying, denitrifying and aerobic heterotrophic bacteria in a CSTR with sludge recycle. For nitrifying and aerobic heterotrophic cultures, the effect of sinusoidal oscillations in DO levels with an amplitude of 1.0 mg/l is a 16% specific growth rate reduction compared to that at a constant DO level. The denitrifiers growth rate is increased by an average of 59%, compared to the constant DO level situation. A similar strategy has been tested in a pilot plant. It is concluded that the influence on specific growth rates is a function of the amplitude of the oscillations. The effects are greatest when concentrations fluctuate around the half saturation concentration of the rate limiting component(s).
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Katharina E., Urban. "Oscillating vegetation dynamics in a wet heathland." Journal of Vegetation Science 16, no. 1 (2005): 111. http://dx.doi.org/10.1658/1100-9233(2005)016[0111:ovdiaw]2.0.co;2.

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Urban, Katharina E. "Oscillating vegetation dynamics in a wet heathland." Journal of Vegetation Science 16, no. 1 (February 2005): 111–20. http://dx.doi.org/10.1111/j.1654-1103.2005.tb02344.x.

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Dissertations / Theses on the topic "Oscillating plant"

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Meyer, Anthony Steven. "Tidal Power Plant: Capturing Tidal Power Using an Oscillating Wing." Thesis, The University of Arizona, 2010. http://hdl.handle.net/10150/146041.

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This report describes the iterative process and steps taken to build a tidal power generator which works efficiently while causing no harm to marine life or habitat. A tidal power generator is a device that converts the mechanical energy from the horizontal tides in the ocean (or any flowing water body) into electrical energy. The design was undertaken as an interdisciplinary capstone project for seniors in mechanical and electrical engineering. The results will be used for research purposes in determining the efficiency of the specific design used and the overall feasibility of tidal power generation. A preliminary prototype consisting of the mechanical linkages and an airfoil was built and tested in the air to prove the various concepts employed work. Based on the results obtained, a full scale model was built and tested in the wind tunnel. An elliptical airfoil was used in harnessing the mechanical energy from the tidal flow. A deflector mounted on the system was to make the elliptical airfoil work bi-directionally. The mechanical linkage consisted of a belt and four sprockets which enable the generator to only see rotary motion in one direction. Finally, a small electric motor was used as a generator to convert the mechanical energy harnessed into electrical energy. The tests performed show that tidal power generation through airfoils is a viable technology with a lot of potential. Using a bi-symmetric airfoil, 5mW of power was produced with a small six volt motor in 40miles/hour wind, with the airfoil moving at over 200 rpm. Rudimentary testing of the same system with an 85% efficient permanent magnet DC generator shows possibilities of over 50W. Given more time in the wind tunnel and the water tunnel (which were fully occupied by graduate students and broken respectively), more elaborate tests could have been performed on the tidal generator. Some improvements which can be made to the system include using lighter bellows seals that can collapse under their own weight, this would decrease the force required to move the airfoil and hence increase the rpm and power generation. Also, an improved design should include a control system that takes into account the flow speed of the water and consequently adjusts the angle of attack of the airfoil. The switching mechanism for the airfoil should also be improved to allow for bi-directional functionality of the system. The system met the majority of its functional requirements and with some minor improvements and more testing has the potential to be very successful.
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Holzhauer, Eva. "Assessment of the power available in a fixed offshore oscillating water column plant." Thesis, Cranfield University, 2012. http://dspace.lib.cranfield.ac.uk/handle/1826/8053.

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The early effects of the global warming can be observed and people around the world are beginning to realize the seriousness of the situation. Reducing the CO2 emissions produced by fossil energy seems to be one of the main worldwide technological challenges at the time of writing. Hence, since the oil crisis in the 70s, a growing interest in renewable energies has been noticed. In Europe, the European Commission fixed a target: to produce 20% of the EU energy from renewable sources by 2020. Similar initiatives, in varying degrees, are being considered around the globe. Among all the renewable energy technologies currently on the market, the ocean energy industry is still at an early stage, despite investigations that have been carried out on both tidal and wave energy devices over the past 40 years. The subject of this thesis focuses on one of the wave energy devices: the Oscillating Water Column. The information found in the literature about this type of plants is mainly about onshore and floating offshore OWCs. Very little information about fixed offshore OWC is available. Besides, the availability of large numbers of fixed offshore structures installed in the world oceans suggests that many of these could possibly host an OWC plant. Hence, the present study investigated a fixed offshore OWC. The aim of this thesis is to assess the power available in a fixed offshore OWC plant. To illustrate the procedure of power assessment, the fictional scenario of a platform located in the Santa Maria sea region, off the coast of Californian, is introduced. This work intends to develop a methodology to study the feasibility of such installation and estimate the power extractable through various complementary approaches. From a theoretical approach based on the wave climate of Santa Maria to wave tank experiments with various geometries and shapes of chamber (cylinder and bent duct buoy in frontward and backward position), the viability of a fixed offshore OWC plant is demonstrated for the chosen location. Results highlight the performance of the Backward Bent Duct Buoy (BBDB) for the Santa Maria characteristic sea conditions. With the intention of completing the study with a Computational Fluid Dynamics (CFD) analysis, numerical investigations about the implementation of an alternative method to generate regular waves demonstrates better results of wave propagation than the common wave generation method based on Linear Wave Theory previously used at Cranfield University. In the conclusion, the work achievements and recommendations for future CFD investigations to reproduce the wave tank experiments are discussed.
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Šalda, Zbyněk. "Ukázky regulací s prediktivním řízením." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232182.

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This thesis deals with model predictive control principally Based Predictive Control (MPC). The first part describes the principle of predictive control, cost function, the choice of a constraints in regulation and the choice of weights. In the next section is an analysis system: a system with non-minimal phase (control water turbine), oscillating systems (trolley frame control) and system with a time-delay . In all of these systems is performed classical feedback control using PID control and concurrently regulation with the MPC. MPC is selected as the solution fy Mathworks Model Predictive Control Toolbox and Simulink. The results are then analyzed using the criteria of quality control.
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Bradshaw, Joel. "Mathematical modelling of droplets climbing an oscillating plane." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/33768/.

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Recent experiments [P. Brunet, J. Eggers, and R. Deegan, Phys. Rev. Lett. 99, 114501 (2007)] have shown that a liquid droplet on an inclined plane can be made to move uphill by sufficiently strong, vertical oscillations. In order to investigate this counterintuitive phenomenon we will derive three different models that qualitatively reproduce the main features of the experiment. For the first model the liquid's inertia and viscosity are assumed negligible, so that the motion of the droplet is dominated by the applied acceleration due to the oscillation of the plate, gravity and surface tension and that the droplet is thin. We explain how the leading order motion of the droplet can be separated into a spreading mode and a swaying mode. For a linear contact line law, the maximum rise velocity occurs when the frequencies of oscillation of the two modes are in phase. We show that, both with and without contact angle hysteresis, the droplet can climb uphill and also that, for certain contact line laws, the motion of the droplet can produce footprints similar to experimental results. We show that if the two modes are out of phase when there is no contact angle hysteresis, the inclusion of hysteresis can force them into phase. This in turn increases the rise velocity of the droplet and can, in some cases, cause a sliding droplet to climb. For the second model we use a two-dimensional flow where the Reynolds number is assumed large enough for viscosity to be neglected. We show that the leading order motion of the droplet can be separated into the same two modes and the net motion of the droplet is an oscillatory function of the frequency. For increasingly non-wetting droplets we discover that the rise velocity begins to oscillate very rapidly as a function of the static contact angle. What we also discover is that the change in the free surface of the droplet is actually a wave travelling travelling across the droplet, and the amount of modes present coincide with the rapid change in the rise velocity. Using a cubic contact line law and contact angle hysteresis we observe a droplet that can climb uphill for parameter values similar to that of the experiment. With the addition of a time dependent term within the contact line law we show that it is possible to obtain a multi-valued relationship between the velocity of the contact line and the respective contact angles, reproducing experimental observations seen for unsteady, moving contact lines. For the third model we again assume that the liquid's viscosity is negligible, similar to model 2, only now for a three-dimensional, thin droplet. For very small amplitudes the motion of the droplet is a combination of a swaying mode and a spreading mode that interact causing a net motion of the droplet. This motion is found to be an oscillatory function of the driving frequency and the magnitude of the peak rise velocity is proportional to one over the frequency squared. By examining the velocity of the centre of the droplet and the displacement of the contact line we see that the absolute maximums of both of these, over one period of oscillation, contain natural frequencies, which are evenly spaced with respect to the square root of the frequency of the oscillation.
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Elwell, Lance Christopher. "Dynamics of stationary and obliquely oscillating free plane jets." Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/17371.

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Marley, Mark Scott. "Nonradial oscillations of Saturn: Implications for ring system structure." Diss., The University of Arizona, 1990. http://hdl.handle.net/10150/184978.

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Numerous wave and gap features observed in Voyager data of Saturn's rings are produced by resonances between the orbital frequencies of known external satellites and ring particle orbits. This thesis investigates the possibility that other, currently unassociated, ring features are generated by perturbations on ring participle orbits produced by non-axisymmetric gravitational fields resulting from acoustic oscillation modes of the planet. The frequencies of Saturnian low degree (l ≤ 8) fundamental (or f) mode oscillations are calculated for a variety of Saturn interior models which span the range of uncertainty of the interior structure of the planet. Corrections for rotation, oblateness, and possible differential rotation have been applied. Only the low degree f-modes are found to have frequencies and likely wave amplitudes in the range necessary to produce gap or wave features in the rings. The calculated positions of outer Lindblad resonances (OLR) for the degree l = 2,3,4, and 5 sectoral f-modes of a single Saturn model lie near four previously unassociated C-ring features. These features are the Maxwell gap and three waves identified as being forced at either OLR or inner vertical resonances. The outer vertical resonance (OVR) of the l = 5, m = 4 mode also overlaps the location of a wave which may be forced at either an OVR or an inner Lindblad resonance. Four other similar wave features, however, cannot be explained by oscillation mode resonances. This failure to account for all of the comparable unassociated C-ring waves is the principal inadequacy of the hypothesis. Other observed properties of the wave features, however, including their azimuthal wavenumbers m and the variation of amplitude with proposed oscillation mode degree are consistent with the proposed forcing. Planetary oscillation amplitudes of ∼1 m are required for gap opening; wave amplitudes of ∼10 cm are required for density wave production. The C-ring thus serves as a very sensitive f-mode detector. Observations by the Cassini spacecraft should unequivocally determine if the C-ring features are produced by planetary oscillation modes. If these observations confirm the association, significant new constraints could be placed on Saturnian energy transport, differential rotation, and core size.
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Zang, Xiaoyun. "Root cause isolation of propagated oscillations in process plants." Thesis, University of Glasgow, 2005. http://theses.gla.ac.uk/1825/.

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Persistent whole-plant disturbances can have an especially large impact on product quality and running costs. There is thus a motivation for the automated detection of a plant-wide disturbance and for the isolation of its sources. Oscillations increase variability and can prevent a plant from operating close to optimal constraints. They can also camouflage other behaviour that may need attention such as upsets due to external disturbances. A large petrochemical plant may have a 1000 or more control loops and indicators, so a key requirement of an industrial control engineer is for an automated means to detect and isolate the root cause of these oscillations so that maintenance effort can be directed efficiently. The propagation model that is proposed is represented by a log-ratio plot, which is shown to be ‘bell’ shaped in most industrial situations. Theoretical and practical issues are addressed to derive guidelines for determining the cut-off frequencies of the ‘bell’ from data sets requiring little knowledge of the plant schematic and controller settings. The alternative method for isolation is based on the bispectrum and makes explicit use of this model representation. A comparison is then made with other techniques. These techniques include nonlinear time series analysis tools like Correlation dimension and maximal Lyapunov Exponent and a new interpretation of the Spectral ICA method, which is proposed to accommodate our revised understanding of harmonic propagation. Both simulated and real plant data are used to test the proposed approaches. Results demonstrate and compare their ability to detect and isolate the root cause of whole plant oscillations. Being based on higher order statistics (HOS), the bispectrum also provides a means to detect nonlinearity when oscillatory measurement records exist in process systems. Its comparison with previous HOS based nonlinearity detection method is made and the bispectrum-based is preferred.
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Scarano, Fabio Rubio. "The effects of ontogeny and environmental oscillations on plant responses to oxygen deprivation." Thesis, University of St Andrews, 1993. http://hdl.handle.net/10023/14344.

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The effects of ontogeny and environmental oscillations on plant responses to oxygen deprivation were investigated for a wide spectrum of species, ranging from agricultural to forestry crops, and from temperate to tropical plants. The extent to which hypoxia- or anoxia-tolerance were affected by ontogeny and environmental oscillations, was assessed mainly through changes in survival and growth and physiological parameters such as respiratory activity, ethanol production and carbohydrate depletion. Anoxia-tolerance of germinating seeds of chickpea (Cicer arietlnum L.) was found to vary, even within the earlier stages of germination, according to the length of the aerobic imbibition period previous to the anoxic shock. The notable fact was that 6 minutes of seed aerobic imbibition prior to anoxic treatment was sufficient to significantly increase post-anoxic survival after 4 days anoxia, compared to seeds not allowed to previously imbibe aerobically. These survival results were mirrored by the significant increase in the oxygen uptake by the embryos of seeds which were allowed to imbibe aerobically for 2 hours prior to anoxia, compared to the embryos of anaerobically imbibed seeds. Germination stage also affected the response of barley (Hordeum vulgare L.) to washing under anoxia, a treatment used to investigate membrane stability and other factors associated with anoxic injury. Temperature, frequency of washing and nutrients present in the washing solution also affect the post-anoxic responses of barley. Daily washing of seedlings under anoxia was often detrimental to post-anoxic survival. One washing only, at the end of the anoxic period, often enhanced survival. This positive effect seemed to be more linked to protection against plasmamembrane leakage due to calcium ions present in the washing solution than to removal of anaerobically-produced potentially toxic volatiles. Two Brazilian tree species were also studied. The seeds of Parkia pendula (Willd.) Benth. ex. Walp., a species typically present in unflooded areas in the Amazon, were still able to germinate after seven months submergence. P.pendula one-month old seedlings, however, did not survive longer than one month flooding, which can be a considerable disadvantage in the ca. six-month long flooding period of the Amazon floodplains. However, adult trees can still be found, although rarely, in flooded areas. The possible strategies involved in an eventual establishment of P.pendula individuals in flooded areas of the Brazilian Amazon are discussed. A contrast is drawn between the responses to flooding of this species and flood-tolerant Parkia discolor. Enterolobium contortisiliquum (Veil.) Morong, is a tree species which is present in both the dry soils of the cerrados (neotropical savannas) in Central Brazil and in the flood-prone Gallery Forests. This species showed considerable tolerance to flooding and drought, as reflected by the various morphological and metabolic adaptations observed in response to these stresses. The role of the xylopodium, a rigid wood tuber, in such tolerance to flood and drought stresses is discussed. Water-stressed roots of some crop species studied presented higher ethanol levels than control plants. Additionally, these same drought-treated roots showed a considerable amount of shrinkage compared to control roots, as measured by root diameter. It is argued that drought causes root shrinkage, which possibly reduces ability of such roots to capture oxygen and results in hypoxia in the tissues and consequent increase in ethanol production. This hypothesis of drought-induced hypoxia is compared with several recent findings in the literature, and is discussed as a possible factor which allows drought, under specific circumstances, to acclimatise plants to a subsequent flooding. From preliminary experiments with alternation of flooding and drought in Eucalyptus species, it appeared that a previous stress affects a plant's response to a subsequent stress. This effect was not always negative, and in E.regnans a five-week drought allowed a subsequent 3-fold increase in flooding survival. This experiment, however, needs to be repeated in order to confirm these results. A common cause for anaerobic injury seems to be unlikely for the diverse plants studied, and anoxia survival often seemed to be related to a combination of morphological and metabolic adaptations. A critical reflection on the risks of labelling plants as tolerant or sensitive to oxygen deprivation is provided, as well as a discussion on the perspectives of applied research which may further the development of ecophysiological theory.
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Reisch, Christoph. "Climatic oscillations and the fragmentation of plant populations genetic diversity within and among populations of the glacial relict plants Saxifraga paniculata (Saxifragaceae) and Sesleria albicans (Poaceae) /." [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=963172956.

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Alexan, Karim Carleton University Dissertation Engineering Aeronautical. "Controlled oscillation of forebody vortices by nozzle jet blowing." Ottawa, 1992.

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Books on the topic "Oscillating plant"

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Dadman, R. Flow around normal and yawed cylinders oscillating over a plane bed. Manchester: UMIST, 1996.

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Narayanan, M. A. Badri. A novel oscillating plane jet: Its effect on ejector thrust augmentation. Monterey, California: Naval Postgraduate School, 1985.

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Eddington, Workshop on Stellar Structure and Habitable Planet Finding (2nd 2003 Palermo Italy). Stellar structure and habitable planet finding: Second Eddington Workshop, 9-11 April 2003, Palermo, Italy. Noordwijk, The Netherlands: ESA Publications Division, 2004.

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Eddington Workshop on Stellar Structure and Habitable Planet Finding (1st 2001 Córdoba, Spain). Proceedings of the First Eddington Workshop on Stellar Structure and Habitable Planet Finding: 11-15 June 2001, Córdoba, Spain. Edited by Battrick B. 1946-, Favata F, and European Space Agency. Noordwijk: ESA Publication Division, 2002.

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Rosenzweig, Cynthia. Climate variability and the global harvest: Impacts of El Nino and other oscillations on agroecosystems. United States: Oxford U Pr, N Y, 2008.

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A, Thomas Jennifer, and Vahle Patricia L, eds. Neutrino oscillations: Present status and future plans. [Singapore]: World Scientific, 2008.

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Smylie, D. E. Earth Dynamics: Deformations and Oscillations of the Rotating Earth. Cambridge University Press, 2018.

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Astrophysics, National Institute of. Stellar Structure and Habitable Planet Finding: Second Eddington Workshop, 9-11 April 2003, Palermo, Italy. ESA Publications, 2004.

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M, Seiner John, Brown Martha C, and Langley Research Center, eds. Near field pressure fluctuations in the exit plane of a choked axisymmetric nozzle. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1997.

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D, László Orlóci Ph. Statistical multiscaling in dynamic ecology: Probing the long-term vegetation process for patterns of parameter oscillation. CreateSpace Independent Publishing Platform, 2012.

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Book chapters on the topic "Oscillating plant"

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Laurent, Gilles, Katrina Macleod, Mark Stopfer, and Michael Wehr. "Dynamic representation of odours by oscillating neural assemblies." In Proceedings of the 10th International Symposium on Insect-Plant Relationships, 7–18. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-017-1890-5_2.

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Kreuzberg, K., and A. Betz. "Rate Limiting Steps in Oscillating Plant Glycolysis: Experimental Evidence for Control Sites Additional to Phosphofructokinase." In Thermodynamics and Pattern Formation in Biology, edited by Ingolf Lamprecht and A. I. Zotin, 185–204. Berlin, Boston: De Gruyter, 1988. http://dx.doi.org/10.1515/9783110848403-012.

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Johnsson, Anders. "Oscillations in Plant Transpiration." In Rhythms in Plants, 93–113. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-68071-0_5.

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Johnsson, Anders. "Oscillations in Plant Transpiration." In Rhythms in Plants, 157–88. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-20517-5_7.

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Schönknecht, Gerald, and Claudia Bauer. "Modelling Ca2+ Oscillations in Plants." In Rhythms in Plants, 295–311. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-68071-0_14.

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Bloch, Ingram. "Integration in the Complex Plane." In The Physics of Oscillations and Waves, 73–87. Boston, MA: Springer US, 1997. http://dx.doi.org/10.1007/978-1-4899-0050-0_5.

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Beilby, Mary Jane. "Modelling Oscillations of Membrane Potential Difference." In Rhythms in Plants, 341–55. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-68071-0_16.

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Homblé, Fabrice. "Membrane Transport and Oscillations in Plants." In Membranes and Circadian Rythms, 125–38. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-79903-7_6.

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Shabala, S. "Physiological implications of ultradian oscillations in plant roots." In Roots: The Dynamic Interface between Plants and the Earth, 217–26. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-2923-9_21.

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Blatt, Michael R., Carlos Garcia-Mata, and Sergei Sokolovski. "Membrane Transport and Ca2+ Oscillations in Guard Cells." In Rhythms in Plants, 115–33. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-68071-0_6.

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Conference papers on the topic "Oscillating plant"

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Garrido, I., A. J. Garrido, M. Alberdi, M. Amundarain, and M. de la Sen. "Sensor control for an Oscillating Water Column plant." In 2013 World Congress on Sustainable Technologies (WCST). IEEE, 2013. http://dx.doi.org/10.1109/wcst.2013.6750399.

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Abbas, M. Saqlain, M. Zulkarnain Abbas, Riffat Asim Pasha, Zahid Suleman, and Zubair Butt. "Design and fabrication of wave energy power plant using oscillating water column technique." In 2015 Power Generation Systems and Renewable Energy Technologies (PGSRET). IEEE, 2015. http://dx.doi.org/10.1109/pgsret.2015.7312248.

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Dudhgaonkar, Prasad V., V. Jayashankar, Purnima Jalihal, S. Kedarnath, T. Setoguchi, M. Takao, S. Nagata, and K. Toyota. "Fluidic Components for Oscillating Water Column Based Wave Energy Plants." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-07035.

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A bidirectional (oscillating) air flow is central to energy conversion from wave to wire in an oscillating water column based wave energy plant. Several classes of bidirectional turbines, which operate with such an oscillating flow, have been designed and tested with limited efficiencies. A topology which uses fluidic diodes in conjunction with unidirectional turbines is shown to significantly improve the efficiency. The design and test results from several fluidic diodes for such an application are discussed. It is shown that a combination of a fluidic diode and the unidirectional turbine can achieve a very high impedance to reverse flow while having a high efficiency in the forward direction, over a wide range of flow coefficients.
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Ren, Li, Peng Minjun, Xia Genglei, and Zhao Yanan. "Research on Natural Circulation Flow Characteristics of Floating Nuclear Power Plant in Heaving Motion." In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-66240.

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The FNPP (Floating Nuclear Power Plant) expanded the application field of Integrated Pressurized Water Reactor (IPWR) in the movable marine platform, it is necessary to study the natural circulation flow characteristics in heaving motion on the ocean. From the characteristics of FNPP, by means of THEATRe code which was based on the two-phase drift flux model and was modified by adding module calculating the effect of heaving motion, the simulation model in heaving motion was built. Using the models developed, the natural circulation operating characteristics of natural circulation in heaving motion and the transitions between forced circulation and natural circulation are analyzed. In the case of amplitude limited, the periods of mass flow rate are equal to periods of heaving motion. The oscillation amplitude of mass flow rate increases with the heaving amplitude increase. In the case of period limited, the natural circulation flow rate oscillating amplitude increases with the heaving period increases. The result obtained are not only evaluating FNPP design behavior properly but also pointing out the direction to further optimum design to ensure FNPP operating safety in heaving motion.
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Kornienko, Yu. "Derivation and Analysis of the Criterion for Onset of Density Wave Oscillation in Tubes and Channels With Riser." In 17th International Conference on Nuclear Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/icone17-75954.

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In a number of nuclear power plant (NPP) applications questions arise as to appearance and development of oscillations in mass flow rate, enthalpy, coolant density in the channels with riser. Density waves oscillations (DWO) are one of the most common kind of self-oscillating processes in the parallel steam-generating channels system. It concerns inter-channel pulsations as well as oscillations in natural convection loops with a periodical space-time density change propagating together with the flow. That is why obtaining an analytical criterion giving the boundary for onset of DWO is of the notable theoretical and practical interest.
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Faÿ, François-Xavier, James Kelly, João Henriques, Ainhoa Pujana, Mohammad Abusara, Markus Mueller, Imanol Touzon, and Pablo Ruiz-Minguela. "Numerical Simulation of Control Strategies at Mutriku Wave Power Plant." In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-78011.

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In order to de-risk wave energy technologies and bring confidence to the sector, it is necessary to gain experience and collect data from sea trials. As part of the OPERA H2020 project, the Mutriku Wave Power Plant (MWPP) is being used as a real condition laboratory for the experiment of innovative technologies. The plant is situated in the North shore of Spain and has been operating since 2011. It uses the Oscillating Water Column (OWC) principle, which consists in compressing and expanding the air trapped in a chamber due to the inner free-surface oscillation resulting from the incident waves. The pressure difference between the air chamber and the atmosphere is used to drive an air turbine. In that case, a self-rectifying air turbine is the best candidate for the energy conversion, as it produces a unidirectional torque in presence of a bi-directional flow. The power take-off system installed is composed of a biradial turbine connected to a 30kW off-the-shelf squirrel cage generator. One of the novelties of the turbine is a high-speed stop-valve installed close to the rotor. The valve may be used to control the flow rate through the turbine or for latching control. This paper focuses on the development, the implementation and the numerical simulation of five control strategies including turbine speed and generator torque controllers. The algorithms were designed thanks to a numerical model describing one of the OWC chambers of the Mutriku power plant. Numerical results are presented for a variety of sea states and a comparison between the proposed control laws in terms of energy production and power quality is performed.
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Kato, Yuki, Rie Arai, Akiko Kaneko, Hideaki Monji, Yutaka Abe, Hiroyuki Yoshida, and Kazuyuki Takase. "Development of Prediction Technology of Two-Phase Flow Dynamics Under Earthquake Acceleration: (12) Bubble Motion Along the Flow in Structure Vibration." In 2014 22nd International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icone22-30016.

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In a nuclear power plant, one of the important issues is an evaluation of the safety of the reactor core and its pipes when an earthquake occurs. Many researchers have conducted studies on constructions of plants. Consequently, there is some knowledge about earthquake-resisting designs. However the influence of an earthquake vibration on thermal fluid inside a nuclear reactor plant is not fully understood. Especially, there is little knowledge how coolant in a core response when large earthquake acceleration is added. Some studies about the response of fluid to the vibration were carried out. And it is supposed that the void fraction and/or the power of core are fluctuated with the oscillation by the experiments and numerical analysis. However the detailed mechanism about a kinetic response of gas and liquid phases is not enough investigated, therefore the aim of this study is to clarify the influence of vibration of construction on bubbly flow behavior. In order to investigate the influence of vibration of construction on bubbly flow behavior, we visualized bubbly flow in pipeline on which sine wave was applied. In a test section, bubbly flow was produced by injecting gas into liquid flow through a horizontal circular pipe. In order to vibrate the test section, an oscillating table was used. The frequency and acceleration of vibration added from the oscillating table was from 1.0 Hz to 10 Hz and . 0.4 G (1 G=9.8 m/s2) at each frequency. The test section and a high speed video camera were fixed on the oscillating table. Thus the relative velocity between the camera and the test section was ignored. PIV measurement was also conducted to investigate interaction between bubble motion and surround in flow structure. Liquid pressure was also measured at upstream and downstream of the test section. The effects of oscillation on bubbly flow were quantitatively evaluated by these pressure measurements and the velocity field. In the results, it was observed that the difference of bubble motion by changing oscillation frequency. Moreover it was suggested that the bubble deformation is correlated with the fluctuation of liquid velocity field around the bubble and the pressure gradient in the flow area. In addition, these experimental results were compared with numerical simulation by a detailed two-phase flow simulation code with an advanced interface tracking method, TPFIT. Numerical simulation was qualitatively agreed with experimental results.
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Ali, A. F., and S. Hadi. "Feasibility study on wave energy power plant with oscillating water column system in Bawean Island Seas Indonesia." In SUSTAINABLE ENERGY AND ADVANCED MATERIALS : Proceeding of the 4th International Conference and Exhibition on Sustainable Energy and Advanced Materials 2015 (ICE-SEAM 2015). AIP Publishing LLC, 2016. http://dx.doi.org/10.1063/1.4943441.

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Schro¨der, J. J., and S. Alraun. "An Extra Mode of Enhanced Heat Transfer by Oscillating Bubbles in Minichannels and Microchannels." In ASME 2003 1st International Conference on Microchannels and Minichannels. ASMEDC, 2003. http://dx.doi.org/10.1115/icmm2003-1083.

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Experimental investigations on heat transfer in tubular micro- or minichannel arrangements more often report on two-phase flow instabilities, pulsations or oscillations, which result in a remarkable influence on heat transfer efficiency. In order to explain the piston-like oscillations of the steam-plugs and water-slugs (-columns), the authors studied the somehow similar process which occurs in the worldwide known toy steam boat. Experiments have been performed which used a demonstration plant made of glass. By controlled electrical heating, high-speed video, pressure and local temperature measurements, the paths of energy have been disclosed. The results are as surprising as the effect of making gold from sand with respect to an equivalent axial heat-conductivity of the water-filled glass tube. Initiated by these results, an abstracting model is presented that analytically quantifies this new regenerating (oscillating and conducting) heat transfer mode e.g. concerning the combination of a heat recharging tube wall and an oscillating water column in a field of diminishing temperatures between the temperature of the boiler surface and the subcooled bulk water. By introducing these heat transfer details, the steam boat can give an answer, not only on frequency and amplitude of the oscillations, but on the steady state conditions for — or time-dependency of — the location of zero-crossing as well. Experimental results and model calculations are in good agreement and need no fitting factors. This is the base to discuss that process along with its physical parameters and compare it to the above mentioned observations in flow-boilers or pulsating heat pipes etc. which use microchannels or minichannels.
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Justino, P. A. P. "Pontryagin Maximum Principle and Control of a OWC Power Plant." In 25th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/omae2006-92057.

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This paper concerns the analytical formulation and numerical simulation of the control of an oscillating-water-column (OWC) power plant. Pontryagin Maximum Principle (PMP) is applied to an OWC with a throttle valve-latching control is allowed. It is assumed that the rotational speed for the turbo-generator set is variable and thus a control strategy for the generator is taken into account. It is also assumed that the plant has a by-pass valve that prevents aerodynamic stall to occur at the turbine rotor blades. The control aims to maximize the amount of energy delivered to the generator taking into account not only the hydrodynamic performance of the device but also the aerodynamic performance of the turbine and bypass valve. It should be noted that this performance depends on the rotational speed of the turbo-generator set and thus it is related to the control strategy applied to the generator. A wave-to-wire model that includes the two control strategies (generator and throttle valve control) is devised.
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Reports on the topic "Oscillating plant"

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Zhou, Ning, Zhenyu Huang, Francis K. Tuffner, and Shuangshuang Jin. Oscillation Detection Algorithm Development Summary Report and Test Plan. Office of Scientific and Technical Information (OSTI), October 2009. http://dx.doi.org/10.2172/981587.

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Grinfeld, Pavel. In-plane Oscillations of a Ring Driven by a Soap Film Catenoid. Journal of Geometry and Symmetry in Physics, 2012. http://dx.doi.org/10.7546/jgsp-20-2010-35-48.

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Long, C., A. Del Genio, W. Gustafson, R. Houze, C. Jakob, M. Jensen, S. Klein, et al. AMIE (ARM MJO Investigation Experiment): Observations of the Madden-Julian Oscillation for Modeling Studies Science Plan. Office of Scientific and Technical Information (OSTI), March 2010. http://dx.doi.org/10.2172/973805.

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