Готові списки джерел за темами / Oscillating modulation of the pressure

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Добірка наукової літератури з теми "Oscillating modulation of the pressure"

Автор: Grafiati
Опубліковано: 30 травня 2022
Оновлено: 31 липня 2025

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Статті в журналах з теми "Oscillating modulation of the pressure"

1

Staubli, Thomas, and Donald Rockwell. "Pressure fluctuations on an oscillating trailing edge." Journal of Fluid Mechanics 203 (June 1989): 307–46. http://dx.doi.org/10.1017/s0022112089001485.

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Анотація:
Turbulent boundary layers separating from a blunt trailing edge give rise to organized vortical structures in the downstream wake. The perturbation of this inherent flow-instability at f0 by controlled oscillations of the edge at fe produces corresponding, organized components of unsteady surface pressure along the edge. For edge excitation near the ‘natural’ vortex shedding frequency f0, the phase between the local pressure fluctuations and the edge displacement shows large changes for small changes in excitation frequency. Moreover, in this range of excitation, there is quenching (or attenua
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2

Marsh, Donald J., Olga V. Sosnovtseva, Alexey N. Pavlov, Kay-Pong Yip, and Niels-Henrik Holstein-Rathlou. "Frequency encoding in renal blood flow regulation." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 288, no. 5 (2005): R1160—R1167. http://dx.doi.org/10.1152/ajpregu.00540.2004.

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With a model of renal blood flow regulation, we examined consequences of tubuloglomerular feedback (TGF) coupling to the myogenic mechanism via voltage-gated Ca channels. The model reproduces the characteristic oscillations of the two mechanisms and predicts frequency and amplitude modulation of the myogenic oscillation by TGF. Analysis by wavelet transforms of single-nephron blood flow confirms that both amplitude and frequency of the myogenic oscillation are modulated by TGF. We developed a double-wavelet transform technique to estimate modulation frequency. Median value of the ratio of modu
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3

Мартынец, Татьяна Викторовна. "Experimental research of oscillating modulation of pressure in hydraulic brake drive." Eastern-European Journal of Enterprise Technologies 2, no. 10(56) (2012): 46–49. http://dx.doi.org/10.15587/1729-4061.2012.3893.

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4

Teixeira, Luis Augusto, Joane de Figueiredo Serpa Coutinho, and Daniel Boari Coelho. "Regulation of dynamic postural control to attend manual steadiness constraints." Journal of Neurophysiology 120, no. 2 (2018): 693–702. http://dx.doi.org/10.1152/jn.00941.2017.

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Анотація:
In daily living activities, performance of spatially accurate manual movements in upright stance depends on postural stability. In the present investigation, we aimed to evaluate the effect of the required manual steadiness (task constraint) on the regulation of dynamic postural control. A single group of young participants ( n = 20) were evaluated in the performance of a dual posturo-manual task of balancing on a platform oscillating in sinusoidal translations at 0.4-Hz (low) or 1-Hz (high) frequencies while stabilizing a cylinder on a handheld tray. Manual task constraint was manipulated by
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5

Han, Tian, Guanshi Wang, Changchun Dong, Xiaolin Jiang, Mingyuan Ren, and Zhu Zhang. "A Self-Oscillating Driving Circuit for Low-Q MEMS Vibratory Gyroscopes." Micromachines 14, no. 5 (2023): 1057. http://dx.doi.org/10.3390/mi14051057.

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Анотація:
This article establishes a circuit model with which to analyze the difficulty of auto-gain control driving for low-Q micromechanical gyroscopes at room temperature and normal pressure. It also proposes a driving circuit based on frequency modulation to eliminate the same-frequency coupling between the drive signal and displacement signal using a second harmonic demodulation circuit. The results of the simulation indicate that a closed-loop driving circuit system based on the frequency modulation principle can be established within 200 ms with a stable average frequency of 4504 Hz and a frequen
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6

Horsman, H. M., K. C. Peebles, and Y. C. Tzeng. "Interactions between breathing rate and low-frequency fluctuations in blood pressure and cardiac intervals." Journal of Applied Physiology 119, no. 7 (2015): 793–98. http://dx.doi.org/10.1152/japplphysiol.00525.2015.

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Evidence derived from spontaneous measures of cardiovagal baroreflex sensitivity (BRS) suggests that slow breathing at 6 breaths/min augments BRS. However, increases in BRS associated with slow breathing may simply reflect the frequency-dependent nature of the baroreflex rather than the modulation of baroreflex function by changes in breathing rate per se. To test this hypothesis we employed a crossover study design ( n = 14) wherein breathing rate and systolic arterial blood pressure (SAP) oscillation induced via the application of oscillating lower body negative pressure (OLBNP) were indepen
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7

Kalashnik, M. V., and S. N. Kulichkov. "On pressure perturbations caused by a moving heat source of the frontal type (hydrostatic mode)." Известия Российской академии наук. Физика атмосферы и океана 55, no. 5 (2019): 51–61. http://dx.doi.org/10.31857/s0002-351555551-61.

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Анотація:
The problem of perturbations of the surface pressure caused by a moving nonstationary frontal heat source (localized along one horizontal coordinate) is considered. Pressure disturbances are associated with internal gravity waves (IGWs). It is shown that when a source moves in a finite-height atmospheric layer (atmospheric waveguide) when a discrete set of vertical IGW modes is excited, there are three types of temporal variation of surface pressure at a fixed observation point. These types correspond respectively to the time signal with amplitude modulation, the signal with frequency modulate
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8

Lester, Rosemary A., and Brad H. Story. "Acoustic Characteristics of Simulated Respiratory-Induced Vocal Tremor." American Journal of Speech-Language Pathology 22, no. 2 (2013): 205–11. http://dx.doi.org/10.1044/1058-0360(2012/12-0043).

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Purpose The purpose of this study was to investigate the relation of respiratory forced oscillation to the acoustic characteristics of vocal tremor. Method Acoustical analyses were performed to determine the characteristics of the intensity and fundamental frequency (F 0 ) for speech samples obtained by Farinella, Hixon, Hoit, Story, and Jones (2006) using a respiratory forced oscillation paradigm with 5 healthy adult males to simulate vocal tremor involving respiratory pressure modulation. The analyzed conditions were sustained productions of /a/ with amplitudes of applied pressure of 0, 1, 2
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9

Chen, C. K., L. Wang, J. T. Yang, and L. T. Chen. "Experimental and Computational Analysis of Periodic Flow Structure in Oscillatory Gas Flow Meters." Journal of Mechanics 22, no. 2 (2006): 137–44. http://dx.doi.org/10.1017/s1727719100004433.

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AbstractThe oscillatory characteristics and dynamic structure of periodic flow in an oscillatory gas flow meter were studied experimentally and numerically. The flow oscillations were triggered by the Coanda effect and an universal correlation between Strouhal number and Reynolds number, Str = 1.09 × 10−3 for ReHD >800, was deduced based on spectral analysis of the pressure fluctuations in the flow channel. Numerical simulation indicated that the evolution of the flow patterns was classified into stages of induction and sustainable periodic oscillation. The transformation between the two st
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10

Amador, Ana, Franz Goller, and Gabriel B. Mindlin. "Frequency Modulation During Song in a Suboscine Does Not Require Vocal Muscles." Journal of Neurophysiology 99, no. 5 (2008): 2383–89. http://dx.doi.org/10.1152/jn.01002.2007.

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Анотація:
The physiology of sound production in suboscines is poorly investigated. Suboscines are thought to develop song innately unlike the closely related oscines. Comparing phonatory mechanisms might therefore provide interesting insight into the evolution of vocal learning. Here we investigate sound production and control of sound frequency in the Great Kiskadee ( Pitangus sulfuratus) by recording air sac pressure and vocalizations during spontaneously generated song. In all the songs and calls recorded, the modulations of the fundamental frequency are highly correlated to air sac pressure. To test
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Дисертації з теми "Oscillating modulation of the pressure"

1

Мартинець, Тетяна Вікторівна. "Розширення області застосування антиблокувальних систем легкових автомобілів шляхом спрощення конструкції модуляторів тиску". Thesis, НТУ "ХПІ", 2017. http://repository.kpi.kharkov.ua/handle/KhPI-Press/35084.

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Анотація:
Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.22.02 – автомобілі та трактори. Національний технічний університет "Харківський політехнічний інститут". – Харків, 2017. З метою розширення області застосування АБС за рахунок зниження вартості модулятора тиску досліджено процес осциляційної модуляції тиску. Запропоновано конструкцію осциляційного модулятора, який задовольняє всі висунуті до нього вимоги, та доведено можливість його застосування в якості виконавчого елемента у складі дуальних адаптивних гальмівних системах. Порівняльний аналіз відомих спосо
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2

Мартинець, Тетяна Вікторівна. "Розширення області застосування антиблокувальних систем легкових автомобілів шляхом спрощення конструкції модуляторів тиску". Thesis, Харківський державний автомобільно-дорожній університет, 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/35082.

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Анотація:
Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.22.02 – автомобілі та трактори. Національний технічний університет "Харківський політехнічний інститут". – Харків, 2017. З метою розширення області застосування АБС за рахунок зниження вартості модулятора тиску досліджено процес осциляційної модуляції тиску. Запропоновано конструкцію осциляційного модулятора, який задовольняє всі висунуті до нього вимоги, та доведено можливість його застосування в якості виконавчого елемента у складі дуальних адаптивних гальмівних системах. Порівняльний аналіз відомих способ
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3

Jeong, Eun S. "Heat transfer with oscillating pressure in reciprocating machinery." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/13259.

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4

Copie, François. "Modulation instabilities in dispersion oscillating passive fiber-ring cavities." Thesis, Lille 1, 2017. http://www.theses.fr/2017LIL10111/document.

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Анотація:
Ces travaux de thèse portent sur l’instabilité paramétrique survenant dans les cavités optiques fibrées passives en anneau, induite par une modulation longitudinale de la dispersion chromatique. Dans les cavités optiques, le processus d’instabilité modulationnelle est connu pour être susceptible de déstabiliser l’état stationnaire et de le transformer en un train stable d’impulsions. Nous décrivons dans ce travail comment une variation longitudinale de la dispersion à l’intérieur de la cavité enrichie la dynamique de ce type de dispositif en engendrant un régime d’instabilité paramétrique. Nou
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5

Copie, François. "Modulation instabilities in dispersion oscillating passive fiber-ring cavities." Electronic Thesis or Diss., Lille 1, 2017. http://www.theses.fr/2017LIL10111.

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Анотація:
Ces travaux de thèse portent sur l’instabilité paramétrique survenant dans les cavités optiques fibrées passives en anneau, induite par une modulation longitudinale de la dispersion chromatique. Dans les cavités optiques, le processus d’instabilité modulationnelle est connu pour être susceptible de déstabiliser l’état stationnaire et de le transformer en un train stable d’impulsions. Nous décrivons dans ce travail comment une variation longitudinale de la dispersion à l’intérieur de la cavité enrichie la dynamique de ce type de dispositif en engendrant un régime d’instabilité paramétrique. Nou
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6

Cheng, Peter D. L. (Peter Dien Leung). "Experiments in heat transfer under conditions of oscillating pressure and flow." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/35458.

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7

Grassmyer, William Alan. "Experiments in heat transfer under conditions of oscillating pressure and flow." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/35981.

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8

Carroll, Matthew J. "First Order Self-Oscillating Class-D Circuit with Triangular Wave Injection." DigitalCommons@CalPoly, 2021. https://digitalcommons.calpoly.edu/theses/2303.

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Анотація:
An investigation into performance improvements to the modulator stage of a class-D amplifier is conducted in this thesis. Two of the standard topologies, namely class-D open-loop pulse-width modulation (PWM), and the improved self-oscillating feedback system are benchmarked against a topology which includes both a hysteretic comparator in a feedback loop and triangle wave injection. Circuit performance is analyzed by comparing how the triangle injection circuit handles known issues with open-loop and self-oscillating circuits. Using this analysis, it is shown that the triangle injection topolo
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9

Tziranis, Alexander Konstantinos 1968. "Temperature, heat flux, and velocity measurements in oscillating flows with pressure variations." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/12790.

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Анотація:
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1992.<br>Vita.<br>Includes bibliographical references (leaves 99-101).<br>by Alexander Konstantinos Tziranis.<br>M.S.
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10

King, Cameron V. "Time-Resolved PIV And Pressure Measurements Of Oscillating And Pulsating Flow In A Diffuser." DigitalCommons@USU, 2008. https://digitalcommons.usu.edu/etd/106.

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Separating oscillating and pulsating flows in an internal adverse pressure gradient geometry are studied experimentally. Simultaneous velocity-pressure measurements demonstrate that the minor losses associated with oscillating flow in an adverse pressure gradient geometry can be smaller or larger than for steady flow. Separation is found to begin high in the diffuser and propagate downward. Flows are able to remain attached further into the diffuser with larger Reynolds numbers, larger stroke lengths, and smaller diffuser angles. The extent of separation grows with Lo/h. The minor losses grow
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Книги з теми "Oscillating modulation of the pressure"

1

United States. National Aeronautics and Space Administration., ed. Oscillating-flow regenerator test rig: Final report. National Aeronautics and Space Administration, 1994.

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2

United States. National Aeronautics and Space Administration., ed. Oscillating-flow regenerator test rig: Final report. National Aeronautics and Space Administration, 1994.

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3

United States. National Aeronautics and Space Administration., ed. Oscillating-flow regenerator test rig: Final report. National Aeronautics and Space Administration, 1994.

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4

M, Shaw Loretta, and Lewis Research Center, eds. Unsteady pressure measurements on a biconvex airfoil in a transonic oscillating cascade. Lewis Research Center, 1985.

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5

Center, Ames Research, and U.S. Army Aviation and Troop Command., eds. 2-D and 3-D oscillating wing aerodynamics for a range of angles of attack including stall. National Aeronautics and Space Administration, Ames Research Center : US Army Aviation and Troop Command, 1994.

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6

Center, Ames Research, and U.S. Army Aviation and Troop Command., eds. 2-D and 3-D oscillating wing aerodynamics for a range of angles of attack including stall. National Aeronautics and Space Administration, Ames Research Center : US Army Aviation and Troop Command, 1994.

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7

Center, Ames Research, and U.S. Army Aviation and Troop Command., eds. 2-D and 3-D oscillating wing aerodynamics for a range of angles of attack including stall. National Aeronautics and Space Administration, Ames Research Center : US Army Aviation and Troop Command, 1994.

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8

Piziali, R. A. 2-D and 3-D oscillating wing aerodynamics for a range of angles of attack including stall. Ames Research Center, 1994.

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9

Center, Ames Research, and U.S. Army Aviation and Troop Command., eds. 2-D and 3-D oscillating wing aerodynamics for a range of angles of attack including stall. National Aeronautics and Space Administration, Ames Research Center : US Army Aviation and Troop Command, 1994.

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10

Pfurtscheller, Gert, and Fernando Lopes da Silva. EEG Event-Related Desynchronization and Event-Related Synchronization. Edited by Donald L. Schomer and Fernando H. Lopes da Silva. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780190228484.003.0040.

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Event-related desynchronization (ERD) reflects a decrease of oscillatory activity related to internally or externally paced events. The increase of rhythmic activity is called event-related synchronization (ERS). They represent dynamical states of thalamocortical networks associated with cortical information-processing changes. This chapter discusses differences between ERD/ERS and evoked response potentials and methodologies for quantifying ERD/ERS and selecting frequency bands. It covers the interpretation of ERD/ERS in the alpha and beta bands and theta ERS and alpha ERD in behavioral tasks
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Частини книг з теми "Oscillating modulation of the pressure"

1

Danto, Ayelet H., and Michelle Pruzansky. "Pressure Modulation." In 1001 Pediatric Treatment Activities, 3rd ed. Routledge, 2024. http://dx.doi.org/10.4324/9781003522416-4.

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2

Petříček, Václav, and Michal Dušek. "Modulation and its Crystallographic Methodology." In High-Pressure Crystallography. Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2102-2_10.

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3

Helvensteijn, B. P. M., A. Kashani, A. L. Spivak, P. R. Roach, J. M. Lee, and P. Kittel. "Pressure Drop over Regenerators in Oscillating Flow." In Advances in Cryogenic Engineering. Springer US, 1998. http://dx.doi.org/10.1007/978-1-4757-9047-4_203.

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4

Mitra, Sunny, Mathew Saxon, Aneesh Rajan, and P. Sajeev. "Design of a Flow Modulator to Generate Sinusoidal Pressure Oscillations." In Lecture Notes in Mechanical Engineering. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-7055-9_20.

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5

Jeong, S., K. Nam, and J. Jung. "Regenerator Characterization under Oscillating Flow and Pulsating Pressure." In Cryocoolers 12. Springer US, 2003. http://dx.doi.org/10.1007/0-306-47919-2_70.

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6

Valenza, F., and L. Gattinoni. "Non-invasive Modulation of Intraabdominal Pressure." In Yearbook of Intensive Care and Emergency Medicine 2005. Springer New York, 2005. http://dx.doi.org/10.1007/0-387-26272-5_28.

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7

McLaren, Susannah B. P., and Fengzhu Xiong. "Lumen Pressure Modulation in Chicken Embryos." In Methods in Molecular Biology. Springer US, 2024. http://dx.doi.org/10.1007/978-1-0716-3854-5_11.

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8

Fonov, S. D., R. H. Engler, Chr Klein, et al. "Investigations of the pressure fields on the oscillating wings by Pressure Sensitive Paint." In Notes on Numerical Fluid Mechanics (NNFM). Vieweg+Teubner Verlag, 1999. http://dx.doi.org/10.1007/978-3-663-10901-3_20.

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9

Takagi, D., S. Ito, K. Takeya, A. Sasoh, K. Nagata, and Y. Sakai. "Post-shock Pressure Modulation through Grid Turbulence." In 28th International Symposium on Shock Waves. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-25685-1_101.

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Leone, M., P. Visintini, and C. Martin. "Modulation of Blood Pressure in Traumatic Brain Injury." In Yearbook of Intensive Care and Emergency Medicine. Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-49433-1_67.

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Тези доповідей конференцій з теми "Oscillating modulation of the pressure"

1

Tesoro, Joshua, Pouya Rassouli, Allen Earley, Zaineb Ashraf, and Noor Jameel. "Pressure and Temperature Modulation in a Hot Isostatic Pressure Chamber." In 2024 46th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). IEEE, 2024. https://doi.org/10.1109/embc53108.2024.10782676.

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2

Song, Jinkwan, and Jong Guen Lee. "Characterization of Spray Formed by Liquid Jet Injected Into Oscillating Air Crossflow." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-43726.

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This paper presents experimental results on the characteristics of spray formed by a liquid (Jet-A) jet injected into an oscillating air crossflow. Ambient air pressure is raised up to 15.86 bar, and the corresponding aerodynamic Weber number and liquid-air momentum flux ratio are up to 1000 and 25, respectively. The level of modulated crossflow velocity is kept up to 20% of its mean value. For limited cases, the air crossflow is preheated. Planar Mie-scattering measurements are utilized to visualize changes of the spray penetration and cross-sectional spray area in the oscillating air crossfl
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3

Boudy, Frédéric, Daniel Durox, Thierry Schuller, and Sébastien Candel. "Nonlinear Flame Describing Function Analysis of Galloping Limit Cycles Featuring Chaotic States in Premixed Combustors." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-68998.

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Анотація:
Nonlinear prediction of combustion instabilities in premixed systems is undertaken on a generic configuration featuring an adjustable feeding manifold length, a multipoint injector composed of a perforated plate and a flame confinement tube. By changing the feeding manifold or flame tube lengths, the system exhibits different types of combustion regimes for the same flow operating conditions. Velocity, pressure and heat release rate measurements are used to examine oscillations during unstable operation. For many operating conditions, a limit cycle is reached at an essentially fixed oscillatio
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4

Berger, Frederik M., Tobias Hummel, Bruno Schuermans, and Thomas Sattelmayer. "Pulsation-Amplitude-Dependent Flame Dynamics of High-Frequency Thermoacoustic Oscillations in Lean-Premixed Gas Turbine Combustors." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-63997.

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Анотація:
This paper presents the experimental investigation of pulsation-amplitude-dependent flame dynamics associated with transverse thermoacoustic oscillations at screech level frequencies in a generic gas turbine combustor. Specifically, the flame behavior at different levels of pulsation amplitudes is assessed and interpreted. Spatial dynamics of the flame are measured by imaging the OH* chemiluminescence signal synchronously to the dynamic pressure at the combustor’s face plate. First, linear thermoacoustic stability states, modal dynamics, as well as flame-acoustic phase relations are evaluated.
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5

Wu, David W., and Hwang Choe. "Effects of Sensor Shape on Oscillating Pressure Measurements With Wind-Tunnel Test Confirmation." In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93942.

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Анотація:
This paper summarizes the effects of the pressure sensor shape on the dynamic oscillating pressure measurements when the pressure wave modulating along the steam/air flow path is to be characterized. In the study presented in the paper, a three-dimensional CFD model of the external flow around the protruding, dome-shaped sensor was developed to evaluate the effects of the sensor shape on the external flow pattern, and the detailed flow patterns were studied with this protruding, dome-shaped sensors and compared with the flow patterns for the flush mounted sensors. Then, a one-dimensional analy
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6

Chishty, Wajid A., Joan Boulanger, and Sangsig Yun. "Experimental and Numerical Investigation of Spatial and Temporal Dispersion of Forced Fuel Oscillations." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-12595.

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Анотація:
In lean premixed combustors of gas turbine engines, fuel-air mixing is considered vital for controlling pollutant emissions as well as combustion instability. Enhancement in mixing may be obtained by modulating the fuel flow rate. Modulation of fuel flow is also a useful technique to actively control combustion instabilities arising from the pressure oscillations in the combustor and thrust augmenters. Effectiveness of the forced oscillations depends on the level of dispersion present in the system. Knowledge of dispersion levels is also important in determining the degree of mixing and theref
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7

Guyot, Daniel, Christian Oliver Paschereit, and Surya Raghu. "A Fluidic Actuator for Active Combustion Control." In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-50797.

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Анотація:
In this work the performance of a fluidic actuator in an active combustion control scheme is demonstrated. The actuator was tested in two different burner configurations, a bluff body burner and a generic swirl-stabilized burner, where it modulated parts of the fuel flow. The oscillation frequency was controlled by varying the inlet mass flow of the actuator. Fluidic actuators are of special interest for fuel-based active control schemes featuring high frequency fuel flow modulation, as they are much more durable then conventional valves due to the absence of fast moving parts. Hot wire measur
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8

Rider, D. M., J. T. Schofield, D. J. McCleese, and J. S. Margolis. "Remote sensing of winds by electrooptic phase modulation of atmospheric emission." In OSA Annual Meeting. Optica Publishing Group, 1986. http://dx.doi.org/10.1364/oam.1986.thk6.

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Анотація:
A new instrumental approach to measurements of upper atmospheric winds is being developed for the upcoming NASA EOS spacecraft. This new approach uses electrooptic phase modulation of atmospheric infrared emission, together with a reference gas cell, to measure wind-induced Doppler shifts by spectral correlation. A single crystal of cadmium telluride (CdTe) to which an oscillating electric field is applied serves as the electrooptic phase modulator (EOPM). Infrared radiation passed through the crystal is phase modulated at the frequency of the applied electric field which places sidebands on e
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9

Meier, U., J. Heinze, and C. Hassa. "Response of Spray and Heat Release to Forced Air Flow Fluctuations in a Gas Turbine Combustor at Elevated Pressure." In ASME Turbo Expo 2007: Power for Land, Sea, and Air. ASMEDC, 2007. http://dx.doi.org/10.1115/gt2007-27310.

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Анотація:
The objective of this work was to investigate the response of the heat release and liquid fuel distribution to forced periodic modulations of the primary air flow through diffusion type burners with different exit geometries. The spatial distribution of spray density and heat release at different modulation frequencies was studied using phase-resolved OH chemiluminescence for heat release visualization, and planar Mie scattering of kerosene. Experiments were performed for a variety of operating conditions. It was observed that the exit geometry of the nozzle has a considerable effect on the fl
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10

Uhm, Jong Ho, and Sumanta Acharya. "Open Loop Control of Combustion Instability With a High-Momentum Air-Jet." In ASME Turbo Expo 2004: Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-53989.

Повний текст джерела
Анотація:
A new strategy for open-loop control of combustion oscillations using a high-momentum air-jet modulated at low frequencies is presented in this paper. The oscillations in the swirl-stabilized spray combustor of interest are dominated by an acoustic mode (235 Hz) with a low frequency (13 Hz) bulkmode (of the upstream cavity) oscillation superimposed. The most effective strategy for control is shown to be achieved through the use of a new concept which utilizes a high-momentum air-jet injected directly into the region of flame dynamics. It is shown that with a low frequency modulation (15 Hz) of
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Звіти організацій з теми "Oscillating modulation of the pressure"

1

Lehotay, Steven J., and Aviv Amirav. Fast, practical, and effective approach for the analysis of hazardous chemicals in the food supply. United States Department of Agriculture, 2007. http://dx.doi.org/10.32747/2007.7695587.bard.

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Анотація:
Background to the topic: For food safety and security reasons, hundreds of pesticides, veterinary drugs, and environmental pollutants should be monitored in the food supply, but current methods are too time-consuming, laborious, and expensive. As a result, only a tiny fraction of the food is tested for a limited number of contaminants. Original proposal objectives: Our main original goal was to develop fast, practical, and effective new approaches for the analysis of hazardous chemicals in the food supply. We proposed to extend the QuEChERS approach to more pesticides, veterinary drugs and pol
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