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Добірка наукової літератури з теми "Pumping mode"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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Статті в журналах з теми "Pumping mode"

Anis, Wagdy R., and M. Abdul-Sadek Nour. "Switching mode photovoltaic pumping system." Energy Conversion and Management 35, no. 9 (September 1994): 765–73. http://dx.doi.org/10.1016/0196-8904(94)90105-8.

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Kharun, V. R., V. М. Senchishak, V. Ya Popovych, and І. І. Shostakivskyi. "The research beam pumping unit of start-up mode." Oil and Gas Power Engineering, no. 1(35) (June 29, 2021): 48–59. http://dx.doi.org/10.31471/1993-9868-2021-1(35)-48-59.

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In the article, research of the beam-pumping unit start-up mode has been performed in accordance with the existing configurations of the rod column, the diameter of the plunger and the dynamic fluid level in the well. A mathematical model of the pumping unit actuator has been developed, it takes into account the mechanical characteristics of the drive motor, the moments of inertia of the belt drive and gears of the gearbox and the mass of the actuator components. Calculations have been performed for the variant of the pump rod column layout - two-stage, for the diameters of the plunger 55mm and depths of pump suspension of 1456 m. The problem of the beam-pumping units’ startup is defined for two cases. The first case is applied when the mass of the counterweights installed on the cranks of the pumping unit exceeds the mass of the column of rods and liquid, which is located in the tubing column above the plunger of the pump (rebalance of the beam pumping unit). The second - when the mass of counterweights is insufficient to balance the column of rods and the liquid in the tubing column above the pump plunger (imbalance of the beam pumping unit). The cases of rebalancing and imbalancing of the pumping unit occur in wells that are under periodic operative conditions. The first case - rebalancing occurs when the oil rocking pumping unit does not work, and the liquid level behind the tubing gradually increases up to its static level. After switching on the drive motor, the torque created by the crank counterweights exceeds the moment caused by means of the weight of the rod column and the liquid in the tubing column. Therefore, it is recommended to start the pumping unit from the lowest position of the rod suspender. In the second case, the imbalance occurs when the liquid’s dynamic level behind the tubing is lowered before receiving the submersible pump. Then the torque, created by the crank counterweights is insufficient to compensate the moment, caused by means of weight of the rods’ column and the liquid in the tubing column. Therefore, it is recommended to start the beam pumping unit from the top position of the rod suspension. As a result of calculations, the conditions of overload occurrence in wells with periodic operative conditions of the pumping unit are determined

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Margo, B. D., and J. Seyed-Yagoobi. "Heat Transfer Enhancement Under Various Orientations Resulting From Attraction Mode Induction Electrohydrodynamic Pumping." Journal of Heat Transfer 116, no. 3 (August 1, 1994): 598–603. http://dx.doi.org/10.1115/1.2910911.

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An induction electrohydrodynamic (EHD) pump in an axisymmetric configuration was designed and built to examine the heat transfer enhancement that accompanies fluid pumping. The apparatus was operated at several tilt angles between 0 (horizontal) and 90 while the augmentation of heat transfer was measured and compared to typical forced pumping and natural circulation. The increase in the overall conductance value for EHD pumping compared to typical forced pumping under turbulent flow conditions was as high as 71 percent. This corresponds to a much higher increase in the inside convection coefficient, which is the only resistance to heat transfer being affected by induction pumping.

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Xiao, Ye, and Xiao Tang Ding. "Analysis and Research on Dynamic Characteristics of Bulb Tubular Pumping Station Structure." Advanced Materials Research 594-597 (November 2012): 1917–21. http://dx.doi.org/10.4028/www.scientific.net/amr.594-597.1917.

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This paper was combined with the third Huaian pumping station to study the dynamic characteristics of the bulb tubular pumping station. By using dynamic finite element analysis method to create Huaian pumping station modes. Then using ANSYS Model Analysis and harmonic response analysis, the vibration modes and dynamic response were researched deeply. According to the mode analysis results, the fundamental frequencies of upper pump house were determined for 1.36Hz and the fundamental frequencies of substructure were determined for 20.11Hz. The dynamic response of the bulb tubular pumping station structure under fluctuating pressures is calculated by ANSYS harmonic response analysis, and the results show that dynamic displacement satisfied the maximum allowable of architectural construction permission，so it can satisfy design requirement, which provides references value for other tubular pumping station in anti-vibration design.

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Abidov, Kudrat, and Odiljon Zaripov. "Self-starting of pump units when extinguishing voltage in the energy saving mode." E3S Web of Conferences 139 (2019): 01088. http://dx.doi.org/10.1051/e3sconf/201913901088.

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The article discusses the main processes that occur during the self-start of pumping units of pumping stations of systems of machine lifting for irrigation, ensuring the rational use of electricity, pumping equipment and irrigation water.

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Zhang, Canran, Gangyi Zhu, Siqing He, and Jun Dai. "Side-mode suppression in ultraviolet quasi-semicircle microlaser cavity." Modern Physics Letters B 34, no. 30 (July 15, 2020): 2050330. http://dx.doi.org/10.1142/s0217984920503303.

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We report a quasi-semicircle GaN ultraviolet microcavity laser. Poincaré map of the quasi-semicircle cavity shows periodic, quasi-periodic and chaotic optical trajectories. Finite-element-method optical near-field distribution patterns of the periodic optical modes agree with the optical loops in the quasi-semicircle cavity. Based on the numerical results, optically pumped lasing experiment shows that ultraviolet multimode lasing action from different optical resonance modes can be effectively stimulated at low pumping intensity in the quasi-semicircle GaN cavity, and the side-mode suppression phenomenon can be obtained at high pumping intensity. Because the possible period optical loops are quasi-periodic and unstable, the quasi-whispering-gallery mode lasing with higher quality factor prefer to dominate the lasing action under high pumping. The experimental and simulated lasing modes suggest that side-mode suppression phenomenon can be caused by the mode competition between quasi-whispering-gallery modes and other quasi-periodic modes.

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Cheng, Yang, Aidan J. Lee, Guanzhong Wu, Denis V. Pelekhov, P. Chris Hammel, and Fengyuan Yang. "Nonlocal Uniform-Mode Ferromagnetic Resonance Spin Pumping." Nano Letters 20, no. 10 (September 21, 2020): 7257–62. http://dx.doi.org/10.1021/acs.nanolett.0c02640.

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Rozanov, Leonid, and Aleksandr Kirillov. "Non-stationary volume-adsorption model for pumping of vacuum chambers." MATEC Web of Conferences 245 (2018): 04007. http://dx.doi.org/10.1051/matecconf/201824504007.

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The non-stationary mathematical model of pumping of gas, located in the volume and adsorbed on the inner surface of vacuum chambers is considered. A feature of the model is the use of variation of adsorption heat with respect to the logarithm of the degree of coverage obtained from the Frendlich adsorption isotherm. The relations between pressure, gas release, heat of adsorption, the amount of adsorbed gas and the pumping time are calculated. The existence of a regular pumping mode is shown. Experimental verification of the model confirms the theoretical calculations. The model makes it possible to specify the pumping time of International Thermonuclear Experimental Reactor vacuum chambers and to obtain a significant economic effect when selecting pumping means by reducing the safety factor.

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Wang, Sen, Yang Yang Zhao, Hong Kui Yan, Dong Ling Liu, Dong Sheng Zhao, Si Yang Li, Yan Long Ren, and Jia Cheng Guo. "Multi-Physics Coupling Analysis of Efficient Pumping Unit Linear Motor." Applied Mechanics and Materials 872 (October 2017): 251–55. http://dx.doi.org/10.4028/www.scientific.net/amm.872.251.

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Taking efficient pumping-unit linear motor as the research object in this paper, SOLIDWORK has been used to establish 3D model and analyze multi-physics of the efficient pumping-unit linear motor, including vibration mode, stress analysis and the analysis of temperature field. Through the simulation analysis, getting efficient pumping unit linear motor of the top five order vibration frequency, pressure distribution and temperature distribution, theoretical references are provided for the analysis of the efficient pumping-unit linear motor. The innovation of the article is in coupling analysis of multi-physics.

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GUDKOVA, N. K., T. L. GORBUNOVA, and N. I. МАTOVA. "INFLUENCE OF MSW LANDFILLS ON DEGRADATION OF BIOGEOCENOSES OF COASTAL ZONES OF WATER COURSES AND THE BLACK SEA." Prirodoobustrojstvo, no. 5 (2021): 117–24. http://dx.doi.org/10.26897/1997-6011-2021-5-117-124.

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Since reducing energy consumption is a priority for an enterprise, economic effi ciency in general is directly related to the use of pumping equipment. The demand for electricity for pumping equipment will depend on various factors: the operating modes of pumping stations and installations, the equipment used measures to reduce the cost of electricity consumed, etc. The current practice indicates extremely inefficient operation of pumping equipment. Currently, a large number of pumping stations of water supply and sanitation systems operate in an uneconomical mode. Very often, this is due to incorrect selection of pumping equipment, outdated pumping equipment, the operation of pumps in non- calculation mode. In addition, pumping equipment has been installed in many industries since the establishment of production. Such equipment is morally and technically outdated. Now,technological progress allows us to use more efficient equipment and materials that allow us to reduce energy consumption. The article presents an analysis of the energy consumption of a pumping station of technical water supply on the example of JSC «Omsk Kauchuk», a variant of modernization is proposed in order to reduce the consumption of electricity by pumping equipment. The need to modernize the pumping station of technical water supply is associated with a significant service life and high –energy consumption of pumping equipment. Two pump brands were selected and a comparative analysis was carried out. Based on calculations of energy consumption and technological characteristics, the most profitable and optimal version of the D6300-80-2b pump was chosen, since the pump performance is greater and the power consumption is less than that of the JETEX DS600-750 pump, as well as reducing the wear rate of operating elements, improving the pump’s suction capacity

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Більше джерел

Дисертації з теми "Pumping mode"

Stranna, Andrea. "Testing of RPT in pumping mode of operation." Thesis, Norges Teknisk-Naturvitenskaplige Universitet, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-20656.

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In this project two pump mode tests has been carried out on a model RPT in the Waterpower Laboratory at NTNU. The measurement set up and execution of the tests were the same, except for the method of dissipating energy in the system. In the first test one of the feed pumps in the basement was used as energy dissipator. In the second test a throttle valve was used as energy dissipator.The objective has been to see how the Waterpower Laboratory is suited for such a test. It was also important to test the two different dissipation methods and evaluate which should be preferred when performing a pump mode test.During the tests it was observed that the guide vane angle kept changing. When the results were processed it became evident that the variations in guide vane angle during the tests had a big influence on the measured pump curves. Variations in guide vane angle has not previously been observed during turbine mode testing. It is presumed that the variation in guide vane angles is due to play in the guide vane system and the design of the guide vanes. The guide vanes are Francis vanes, and not RPT vanes. It is assumed that it is the sharp trailing edge of the guide vanes that causes turbulence over the vanes in pump mode, thus making the guide vanes move about within the play of the guide vane system. It is suggested that the guide vane system is replaced with an RPT guide vane system for further testing in pump mode.The two dissipation methods tested were both effective. The throttle valve works best for achieving 0 flow, while the feed pump is easier to regulate. None of the methods showed signs of high noise or vibrations, and both may be used for future tests.

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Ješe, Uroš. "Numerical study of pump-turbine instabilities : pumping mode off-design conditions." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAI090/document.

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Actuellement, la flexibilité et le stockage de l'énergie sont parmi les principaux défis de l'industrie de l'énergie. Les stations de transfert d'énergie par pompage (STEP), en utilisant des turbines-pompes réversibles, comptent parmi les solutions les plus rentables pour répondre à ces besoins. Pour assurer un réglage rapide du réseau électrique, les turbines-pompes sont sujettes à de rapides changements entre modes pompage et turbinage. Elles sont souvent exposées à un fonctionnement prolongé dans des conditions hors nominal. Pour assurer la stabilité du réseau, la zone d'exploitation continue de turbines-pompes réversibles doit être libre de toute instabilité hydraulique. Deux sources principales d'instabilités en mode pompage peuvent limiter la plage de fonctionnement continu. Il s'agit de la présence de cavitation et de décollement tournant, tous deux survenant à charge partielle. La cavitation peut conduire à des vibrations, des pertes de performance et parfois même à l'érosion de la turbine-pompe. En outre, en raison de décollements tournants (apparition et décomposition périodique de zones de recirculation dans les régions du distributeur), la machine peut être exposée à un changement incontrôlable entre les points de fonctionnement, avec une modification de charge et une baisse significative des performances. Les deux phénomènes sont très complexes, tri-dimensionnels et délicats à étudier. Surtout le phénomène de décollement tournant dans les turbines-pompes est peu abordé dans la littérature. Le premier objectif de l'étude du doctorat présenté a été d'utiliser un code numérique, testé au laboratoire, et de développer une méthodologie de calcul pour permettre la prévision des phénomènes à charge partielle. L'étude a été faite sur une géométrie à échelle réduite d'une turbine-pompe de haute chute. Des calculs numériques ont été effectués en utilisant le code FINE/Turbo avec le modèle de cavitation barotrope qui a été développé au laboratoire. L'analyse des écoulements cavitants a été faite pour des débits et de niveaux de cavitation différents. Les principales analyses portent sur des valeurs naissantes de cavitation, des courbes de chute et sur le prédiction des formes de cavitation pour différents débits et valeurs de NPSH. Une attention particulière a été portée sur l'interaction entre les formes de cavitation à l'entrée de la roue et la baisse de performance (zone de feston), causée par le décollement tournant qui apparaît dans la région du distributeur. Les résultats numériques ont montré un bon accord avec les données expérimentales disponibles. La deuxième partie de la thèse a concerné la prédiction et l'analyse de décollements tournants. Des simulations ont été utilisées pour prédire les régions d'exploitation stables et instables de la machine. La méthodologie mentionnée pourrait fournir des résultats globaux précis pour différents points de fonctionnement avec un faible coût de calcul. Afin d'obtenir des informations détaillées sur les écoulements instables, des simulations instationnaires plus précises ont été réalisées. L'analyse locale des écoulements a permis la description des mécanismes gouvernant le phénomène de décollement tournant. Les analyses permettent l'étude du nombre, de l'intensité et des fréquences de rotation des cellules tournants. En outre, les calculs instationnaires donnent une très bonne prédiction de la performance de la turbine-pompe. L'approche proposée est fiable, robuste et précise. La méthodologie de calcul proposée peut être utilisée sur plusieurs géométries de turbine-pompe (ou pompe centrifuge), pour une large gamme de débits et de géométries de directrices. Les simulations proposées peuvent être utilisées à l'échelle industrielle pour étudier les effets de géométrie, d'angles d'ouverture de directrices ou de l'influence du jeu entre la roue et le distributeur afin de réduire ou même éliminer les effets négatifs des décollements tournants
Flexibility and energy storage seem to be the main challenges of the energy industry at the present time. Pumped Storage Power Plants (PSP), using reversible pump-turbines, are among the most cost-efficient solutions to answer these needs. To provide a rapid adjustment to the electrical grid, pump-turbines are subjects of quick switching between pumping and generating modes and to extended operation under off-design conditions. To maintain the stability of the grid, the continuous operating area of reversible pump-turbines must be free of hydraulic instabilities. Two main sources of pumping mode instabilities are the presence of the cavitation and the rotating stall, both occurring at the part load. Presence of cavitation can lead into vibrations, loss of performance and sometimes erosion. Moreover, due to rotating stall that can be observed as periodic occurrence and decay of recirculation zones in the distributor regions, the machine can be exposed to uncontrollable shift between the operating points with the significant discharge modification and the drop of the efficiency. Both phenomena are very complex, three-dimensional and demanding for the investigation. Especially rotating stall in the pump-turbines is poorly addressed in the literature. First objective of the presented PhD study has been to develop the cost-efficient numerical methodology in order to enable the accurate prediction and analysis of the off-design part load phenomena. The investigations have been made on the reduce-scaled high head pump-turbine design (nq = 27rpm) provided by Alstom Hydro. Steady and unsteady numerical calculations have been performed using code FINE/Turbo with barotropic cavitation model implemented and developed before in the laboratory. Some of the numerical results have been compared to the experimental data. Cavitating flow analysis has been made for various flow rates and wide range of cavitation levels. Flow investigation has been focused on the cavitation influence on the flow behavior and on the performance of the machine. Main analyses include incipient cavitation values, head drop curves and cavitation forms prediction for wide ranges of flow rates and NPSH values. Special attention has been put on the interaction between cavitation forms and the performance drop (hump zone) caused by the rotating stall. Cavitation results showed good agreement with the provided experimental data. Second part of the thesis has been focused on the prediction and analysis of the rotating stall flow patterns. Computationally fast steady simulations has been presented and used to predict stable and unstable operating regions. The analyses have been done on 4 different guide vanes openings and 2 guide vanes geometries. In order to get detailed information about the unsteady flow patterns related to the rotating stall, more exact unsteady simulations have been performed. Local flow study has been done to describe in details the governing mechanisms of the rotating stall. The analyses enable the investigations of the rotating stall frequencies, number of stalled cells and the intensity of the rotating stall. Moreover, the unsteady calculations give very good prediction of the pump-turbine performance for both, stable and unstable operating regions. Numerical results give very good qualitative and quantitative agreement with the available experimental data. The approach appears to be very reliable, robust and precise. Even though the numerical results (rotating stall frequencies, number of cells...) on the actual geometry should be confirmed experimentally, author believes that the methodology could be used on any other pump-turbine (or centrifugal pump) geometry. Moreover, the simulations can be used industrially to study the effects of the guide vanes geometries, guide vanes opening angles and influence of the gap between the impeller and the distributor in order to reduce or even eliminate the negative effects of the rotating stall

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Eibna, Halim Md Zubaer. "Passively mode-locked picosecond Nd:KGW laser with low quantum defect diode pumping." Astro Ltd, 2016. http://hdl.handle.net/1993/31913.

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Solid-state lasers are capable of providing versatile output characteristics with greater flexibility compared to other popular laser systems. Lasing action has been achieved in many hundreds of solid-state media, but Nd-ion doped gain media are widely used to reach high power levels with short pulses. In this work, commercially available Nd:KGW crystal served as a gain medium to achieve pulsed operation at 1067 nm. This laser crystal offers large stimulated emission crosssection and gain bandwidth which facilitates generation of high peak power pulses in the picosecond regime. The KGW crystal is monoclinic and biaxial in structure, and anisotropic in its optical and thermal properties. Due to poor thermal conductivity, this crystal can be operated within a limited power range before crystal fracture takes place. To reduce the amount of heat deposited in the gain media, we introduced a new pumping wavelength of 910 nm which reduces the quantum defect by more than 45%. Continuous-wave laser operation was optimized to operate in mode-locked regime. In order to achieve short light pulses from the continuous-wave laser, one of the end mirrors was replaced by a semiconductor saturable absorber mirror (SESAM) to generate 2.4 ps pulses at a repetition rate of 83.8 MHz. An average output power of 87 mW was obtained at lasing wavelength of 1067 nm and the beam was nearly diffraction limited with M^2 < 1.18. The peak power of the generated pulses was 427 W and energy of each pulse was >1 nJ. Pumping the crystal at longer wavelength (910 nm) reduced the thermal lensing of the crystal by half when compared to conventional pumping at shorter wavelength (808 nm). To the best of our knowledge, this is the first time passive mode-locking of a Nd:KGW laser was explored using the pump wavelength at 910 nm.
February 2017

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Langford, N. J. "Pumping and mode-locking techniques for near-infrared dye and colour centre lasers." Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47146.

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Ito, Takeshi. "Mode of action study of inhibitors of energy converting NADH-quinone oxidoreductases." Kyoto University, 2018. http://hdl.handle.net/2433/232338.

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Kyoto University (京都大学)
0048
新制・課程博士
博士(農学)
甲第21137号
農博第2263号
新制||農||1057(附属図書館)
学位論文||H30||N5111(農学部図書室)
京都大学大学院農学研究科応用生命科学専攻
(主査)教授三芳秀人, 教授宮川恒, 教授加納健司
学位規則第4条第1項該当

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Yip, Ka Wa. "Optical pumping of multiple atoms in the single photon subspace of two-mode cavity QED." Miami University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=miami1438288697.

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Adur, Rohan. "Magnetic Coupling and Relaxation at Interfaces Measured by Ferromagnetic Resonance Spectroscopy and Force Microscopy." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1406120604.

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MALDONADO, EDISON P. "Estudo dos mecanismos de geracao de pulsos ultracurtos em lasers de neodimio com bombeamento continuo longitudinal." reponame:Repositório Institucional do IPEN, 1995. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10465.

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Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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ROSSI, WAGNER de. "Construcao e operacao de lasers de neodimio: estudo do comportamento temporal." reponame:Repositório Institucional do IPEN, 1995. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10435.

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Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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Рєзва, Ксенія Сергіївна. "Удосконалення проточних частин високонапірних оборотних гідромашин на основі чисельного моделювання їх гідродинамічних характеристик". Thesis, Національний технічний університет "Харківський політехнічний інститут", 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/40009.

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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.05.17 – гідравлічні машини і гідропневмоагрегати. – Національний технічний університет "Харківський політехнічний інститут", Харків, 2019 р. Дисертацію присвячено вирішенню науково-практичної задачі удосконалення проточних частин високонапірних оборотних гідромашин за рахунок розробки методів розрахунку та аналізу їх гідродинамічних характеристик. На підставі розгляду тенденцій розвитку гідроенергетики України, з урахуванням ролі високонапірних оборотних гідромашин в об'єднаній енергетичній системі, відмічено актуальність проектування нових проточних частин. Визначено переваги та недоліки існуючих методів дослідження гідродинамічних процесів у проточних частинах оборотних гідромашин. Наведені результати розрахунку гідродинамічних характеристик елементів проточної частини на основі методу осереднених безрозмірних параметрів для оборотних гідромашин ОРО200-В-100 та ОРО500-В-100. Застосована математична модель робочого процесу гідромашини на основі блочно-ієрархічного підходу для проведення дослідження балансу енергії. Визначено вплив геометричних параметрів елементів проточної частини на показники роботи. Проведено чисельне дослідження просторової течії рідини в проточній частині високонапірних оборотних гідромашин за допомогою CFD, що дозволило визначити та візуалізувати картину течії. Складено баланси енергії гідромашин ОРО200-В-100 та ОРО500-В-100. Відмічено, що розподіл втрат по елементам проточної частини нерівномірний: для ОРО200-В-100 найбільшу частину втрат складають втрати в робочому колесі (близько 56 %), для ОРО500-В-100 – втрати у підводі (близько 62 %). Описано основні положення визначення оптимального режиму роботи оборотної гідромашини. Запропоновано та досліджено модифікований підвід для тихохідної оборотної гідромашини ОРО500-В-100, щоб підвищити її енергетичні показники: краще узгоджені елементи ПЧ та гідравлічний ККД збільшився на 2 %.
Thesis for granting the Degree of Candidate of Technical sciences in speciality 05.05.17 – Hydraulic machines and hydropneumatic units. – National Technical University "Kharkiv Polytechnic Institute", 2019. The tеhesis is devoted to the solution of the scientific and practical problem of improvement of the water passages of the high-pressure reversible hydraulic due to calculation and analysis their hydrodynamic characteristics. Based on the review of the trends in the development of hydropower engineering in Ukraine and given the role of high-pressure reversible hydraulic machines in the United Power System, it was noted that the designing a new flow parts is topical task. Advantages and disadvantages of the existing methods for research hydrodynamic processes in water passages of reversible hydraulic machines were identified after their analysis. The results of the calculation of the hydrodynamic characteristics of the elements of the water passages based on the method of averaged dimensionless parameters using the example of reversible hydraulic machines OPO200-B-100 and OPO500-B-100 were demonstrated. The mathematical model of the hydraulic machine working process based on a block-hierarchical approach was used to study the energy balance in the turbine and pump modes of hydraulic machines. The influence of the geometrical parameters of the elements of the water passage on the performance was determined: how the angle of flow in the spiral casing (cп ), the height of the wicket gate (b0 D) and the shape of the wicket gate profile influence the value of the coefficient resistance in the wicket gate. A numerical study of the three-dimensional flow of fluid in the water passage of high-pressure reversible hydraulic machines was carried out using the CFD software. This program allows determining the character of the flow and presenting the fields of distribution of velocity components, pressure and streamlines. The balances of energy were compiled: for the OPO200-B-100 in the turbine and pump operation modes, for the OPO500-B-100 in the turbine operation mode. It is noted that the distribution of losses on the elements of the water passage is not uniform: for the OPO200-B-100, the greatest part of the total losses are losses in the runner (about 56%), for OPO500-B-100 - losses in the inlet (about 62%). The main points for determining the optimal operating mode of the reversible hydraulic machine are described. The modified inlet for low-speed high-pressure hydraulic machine OPO500-B-100 was proposed and investigated to increase energy performance of hydraulic machine. The spiral casing was expanded, the number of stay vane blades and wicket gate blades were reduced to 16. As a result of the calculations of the modified inlet, the obtained results showed that the second variant made it possible to better align the elements of the water passage and the hydraulic efficiency increased by 2 %.

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Книги з теми "Pumping mode"

Wanakule, Nisai. Development and testing of a model for determining optimal pumping and recharge of large-scale aquifers. Austin, Texas: College of Engineering, The University, 1985.

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Hayes, Philip Joseph. An r-[theta] co-ordinate numerical model, incorporating mesh refinement, for the investigation of pumping tests in heterogeneous aquifers. Birmingham: University of Birmingham, 1998.

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Makhmudov, Ilkhom Ernazarovich. UNSTEADY WATER MOVEMENT IN THE CANALS DUE TO THE PUMPING STATIONS OPERATION MODE. RS Global S. z O.O., 2022. http://dx.doi.org/10.31435/rsglobal/045.

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Femtosecond pulses generated from a synchronously pumped chromium-doped forsterite laser. New York, NY: City University of New York, 1995.

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Femtosecond pulses generated from a synchronously pumped chromium-doped forsterite laser. New York, NY: City University of New York, 1995.

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Saitoh, E., and K. Ando. Experimental observation of the spin Hall effect using spin dynamics. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198787075.003.0015.

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This chapter describes an experiment on the inverse spin Hall effect (ISHE) induced by spin pumping. Spin pumping is the generation of spin currents as a result of magnetization M(t) precession; in a ferromagnetic/paramagnetic bilayer system, a conduction-electron spin current is pumped out of the ferromagnetic layer into the paramagnetic conduction layer in a ferromagnetic resonance condition. The sample used in the experiment is a Ni81Fe19/Pt bilayer film comprising a 10-nm-thick ferromagnetic Ni81Fe19layer and a 10-nm-thick paramagnetic Pt layer. For the measurement, the sample system is placed near the centre of a TE011 microwave cavity at which the magnetic-field component of the microwave mode is maximized while the electric-field component is minimized.

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Kavokin, Alexey V., Jeremy J. Baumberg, Guillaume Malpuech, and Fabrice P. Laussy. Quantum description of light–matter coupling. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198782995.003.0005.

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In this chapter we study with the tools developed in Chapter 3 the basic models that are the foundations of light–matter interaction. We start with Rabi dynamics, then consider the optical Bloch equations that add phenomenologically the lifetime of the populations. As decay and pumping are often important, we cover the Lindblad form, a correct, simple and powerful way to describe various dissipation mechanisms. Then we go to a full quantum picture, quantizing also the optical field. We first investigate the simpler coupling of bosons and then culminate with the Jaynes–Cummings model and its solution to the quantum interaction of a two-level system with a cavity mode. Finally, we investigate a broader family of models where the material excitation operators differ from the ideal limits of a Bose and a Fermi field.

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Cypress Avenue Pumping Station: Hydraulic model investigation / by Bobby P. Fletcher. Vicksburg, MS: US Army Corps of Engineers, Waterways Experiment Station, 1994.

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P, Fletcher Bobby, and Hydraulics Laboratory (U.S.), eds. Alton Pumping Station, Alton, Illinois: Hydraulic model investigation. Vicksburg, Miss: US Army Corps of Engineers, Hydraulics Laboratory, 1991.

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Hydraulics Laboratory (U.S.), ed. St. Johns Bayou Pumping Station, Missouri: Hydraulic model investigation. Vicksburg, Miss: US Army Corps of Engineers, Hydraulics Laboratory, 1991.

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Chihi, Asma, Adel Chbeb, and Anis Sellami. "Switching Function Optimization of Sliding Mode Control to a Photovoltaic Pumping System." In Advances and Applications in Sliding Mode Control systems, 463–93. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-11173-5_17.

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New, G. H. C., and J. M. Catherall. "Advances in the Theory of Mode-Locking by Synchronous Pumping." In Springer Series in Chemical Physics, 24–26. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82918-5_8.

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Ell, Richard, Gregor Angelow, Wolfgang Seitz, Max J. Lederer, Huber Heinz, Daniel Kopf, Jonathan R. Birge, and Franz X. Kärtner. "Quasisynchronous Pumping of Mode-locked Few-cycle Titanium Sapphire Lasers." In Springer Series in Optical Sciences, 103–9. New York, NY: Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-49119-6_13.

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Chihi, Asma, and Anis Sellami. "Nonlinear Discrete Time Sliding Mode Control Applied to Pumping System." In Advances and Applications in Nonlinear Control Systems, 595–609. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-30169-3_26.

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Schechner, Korbinian, Florian Bauer, and Christoph M. Hackl. "Nonlinear DC-link PI Control for Airborne Wind Energy Systems During Pumping Mode." In Airborne Wind Energy, 241–76. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-1947-0_11.

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Coleman, Joseph, Hammad Ahmad, Emmanuel Pican, and Daniel Toal. "Non-Reversing Generators in a Novel Design for Pumping Mode AirborneWind Energy Farm." In Airborne Wind Energy, 587–97. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-39965-7_34.

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Shah, Khushboo, Deepak Patel, and Tarun Sachdeva. "Cuk Converter-Assisted PV-Fed DC Water Pumping System with Modified Sliding Mode Controller for Enhanced Power Conversion." In Proceedings of International Conference on Industrial Instrumentation and Control, 329–41. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-7011-4_33.

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Wedemeyer, Arnd. "Pumping Honey." In De/Constituting Wholes, 177–214. Vienna: Turia + Kant, 2017. http://dx.doi.org/10.37050/ci-11_09.

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For the duration of the one hundred days of the documenta 6 in 1977, Joseph Beuys made honey flow from this slightly awkward pit, the well of a destructive esprit d’escalier, this site of a sovereignty evacuated many times over. Beuys, that is, installed his fable of the bees at a purposefully vacuous palace where courtly culture had surrendered to the modern museum, but more specifically even, at the supplemental, feigned, then bombed-out site of popular sovereignty.

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Kinzelbach, Wolfgang, Haijing Wang, Yu Li, Lu Wang, and Ning Li. "Policy Options of Over-Pumping Control in the NCP." In Springer Water, 25–51. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-5843-3_2.

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AbstractStarting in the 1990s, China has been issuing regulations and policy rules related to groundwater management and pumping control on both national and provincial levels. These policies include the requirement of permits for well drilling, a well spacing policy, pumping quota management, water resources fee collection, setting of irrigation water prices, a water rights system, water markets, and more.

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Asbóth, János K., László Oroszlány, and András Pályi. "Adiabatic Charge Pumping, Rice-Mele Model." In A Short Course on Topological Insulators, 55–68. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-25607-8_4.

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Тези доповідей конференцій з теми "Pumping mode"

Astrauskas, Ignas, Edgar Kaksis, Tobias Flory, Giedrius Andriukaitis, Pavel Malevich, Tadas Balciunas, Audrius Pugzlys, and Andrius Baltuska. "Burst-mode pumping scheme for longwave parametric amplification." In 2017 Conference on Lasers and Electro-Optics Europe (CLEO/Europe) & European Quantum Electronics Conference (EQEC). IEEE, 2017. http://dx.doi.org/10.1109/cleoe-eqec.2017.8086709.

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Chihi, Asma, Anis Sellami, and Mohamed Abdellatif Khalfa. "Sliding mode control of a photovoltaic pumping system." In MELECON 2012 - 2012 16th IEEE Mediterranean Electrotechnical Conference. IEEE, 2012. http://dx.doi.org/10.1109/melcon.2012.6196581.

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Kaksis, Edgar, Ignas Astrauskas, Tobias Flöry, Edgar Kaksis, Giedrius Andriukaitis, Pavel Malevich, Tadas Balčiūnas, Audrius Pugžlys, and Andrius Baltuška. "Isolated Pulse Parametric Frequency Conversion under Burst-Mode Pumping." In CLEO: Science and Innovations. Washington, D.C.: OSA, 2018. http://dx.doi.org/10.1364/cleo_si.2018.sm4m.1.

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Yang, Yue-De, Jin-Long Xiao, Zhi-Xiong Xiao, Hai-Zhong Weng, and Yong-Zhen Huang. "Mode control for microcylinder laser with non-uniform pumping." In Asia Communications and Photonics Conference. Washington, D.C.: OSA, 2015. http://dx.doi.org/10.1364/acpc.2015.asu3b.3.

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Rhif, Ahmed. "A sliding mode observer for a sensorless pumping system." In 2015 7th International Conference on Modelling, Identification and Control (ICMIC). IEEE, 2015. http://dx.doi.org/10.1109/icmic.2015.7409429.

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Petrov, Lyuben S., Kaloyan Georgiev, Anton Trifonov, and Ivan Buchvarov. "Diode Bar Pumping of Single Mode Solid State Lasers." In 2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC). IEEE, 2021. http://dx.doi.org/10.1109/cleo/europe-eqec52157.2021.9541994.

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Wang, Yu, Sze Y. Set, and Shinji Yamashita. "Thulium-doped Fiber Laser Actively Mode Locked by Modulated Pumping." In CLEO: Science and Innovations. Washington, D.C.: OSA, 2016. http://dx.doi.org/10.1364/cleo_si.2016.stu3p.1.

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Anwar, Nihal M., Hesham A. Youssef, Ziad A. El-Sahn, Moustafa H. Aly, and El-Sayed A. El-Badawy. "On the Performance of Few-Mode EDFAs with Bidirectional Pumping." In Asia Communications and Photonics Conference. Washington, D.C.: OSA, 2016. http://dx.doi.org/10.1364/acpc.2016.af2a.104.

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Yu, Yizhong, Jianquan Yao, Zhigang Zhang, Wuqi Wen, Jianyong Zhou, and Jun Li. "SESAM mode-locked YAG laser with LD side-pumping module." In Photonics Asia 2004, edited by Dianyuan Fan, Ken-ichi Ueda, and Jongmin Lee. SPIE, 2005. http://dx.doi.org/10.1117/12.574897.

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Kong, Weipeng, and Takunori Taira. "Lens-less edge-pumping high power single-mode Yb:YAG microchip laser." In CLEO: Science and Innovations. Washington, D.C.: OSA, 2012. http://dx.doi.org/10.1364/cleo_si.2012.ctu1d.2.

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Звіти організацій з теми "Pumping mode"

Peurrung, L. M., S. M. Caley, E. Y. Bian, and P. A. Gauglitz. Gas release during salt well pumping: model predictions and comparisons to laboratory experiments. Office of Scientific and Technical Information (OSTI), September 1996. http://dx.doi.org/10.2172/396635.

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Novokhatski, A. DAMPING THE HIGH ORDER MODES IN THE PUMPING CHAMBER OF THE PEP-II LOW ENERGY RING. Office of Scientific and Technical Information (OSTI), June 2004. http://dx.doi.org/10.2172/827320.

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Peurrung, L. M., S. M. Caley, and P. A. Gauglitz. Gas release during salt-well pumping: Model predictions and laboratory validation studies for soluble and insoluble gases. Office of Scientific and Technical Information (OSTI), August 1997. http://dx.doi.org/10.2172/563226.

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Cohen, Roni, Kevin Crosby, Menahem Edelstein, John Jifon, Beny Aloni, Nurit Katzir, Haim Nerson, and Daniel Leskovar. Grafting as a strategy for disease and stress management in muskmelon production. United States Department of Agriculture, January 2004. http://dx.doi.org/10.32747/2004.7613874.bard.

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The overall objective of this research was to elucidate the horticultural, pathological, physiological and molecular factors impacting melon varieties (scion) grafted onto M. cannonballus resistant melon and squash rootstocks. Specific objectives were- to compare the performance of resistant melon germplasm (grafted and non-grafted) when exposed to M. cannoballus in the Lower Rio Grande valley and the Wintergarden, Texas, and in the Arava valley, Israel; to address inter-species relationships between a Monosporascus resistant melon rootstock and susceptible melon scions in terms of fruit-set, fruit quality and yield; to study the factors which determine the compatibility between the rootstock and the scion in melon; to compare the responses of graft unions of differing compatibilities under disease stress, high temperatures, deficit irrigation, and salinity stress; and to investigate the effect of rootstock on stress related gene expression in the scion. Some revisions were- to include watermelon in the Texas investigations since it is much more economically important to the state, and also to evaluate additional vine decline pathogens Didymella bryoniae and Macrophomina phaseolina. Current strategies for managing vine decline rely heavily on soil fumigation with methyl bromide, but restrictions on its use have increased the need for alternative management strategies. Grafting of commercial melon varieties onto resistant rootstocks with vigorous root systems is an alternative to methyl bromide for Monosporascus root rot/vine decline (MRR/VD) management in melon production. Extensive selection and breeding has already produced potential melon rootstock lines with vigorous root systems and disease resistance. Melons can also be grafted onto Cucurbita spp., providing nonspecific but efficient protection from a wide range of soil-borne diseases and against some abiotic stresses, but compatibility between the scion and the rootstock can be problematic. During the first year experiments to evaluate resistance to the vine decline pathogens Monosporascus cannonballus, Didymella bryoniae, and Macrophomina phaseolina in melon and squash rootstocks proved the efficacy of these grafted plants in improving yield and quality. Sugars and fruit size were better in grafted versus non-grafted plants in both Texas and Israel. Two melons (1207 and 124104) and one pumpkin, Tetsukabuto, were identified as the best candidate rootstocks in Texas field trials, while in Israel, the pumpkin rootstock RS59 performed best. Additionally, three hybrid melon rootstocks demonstrated excellent resistance to both M. cannonballus and D. bryoniae in inoculated tests, suggesting that further screening for fruit quality and yield should be conducted. Experiments with ABA in Uvalde demonstrated a significant increase in drought stress tolerance and concurrent reduction in transplant shock due to reduced transpiration for ‘Caravelle’ plants. In Israel, auxin was implicated in reducing root development and contributing to increased hydrogen peroxide, which may explain incompatibility reactions with some squash rootstocks. However, trellised plants responded favorably to auxin (NAA) application at the time of fruit development. Gene expression analyses in Israel identified several cDNAs which may code for phloem related proteins, cyclins or other factors which impact the graft compatibility. Manipulation of these genes by transformation or traditional breeding may lead to improved rootstock cultivars. Commercial applications of the new melon rootstocks as well as the ABA and TIBA growth regulators have potential to improve the success of grafted melons in both Israel and Texas. The disease resistance, fruit quality and yield data generated by the field trials will help producers in both locations to decide what rootstock/scion combinations will be best.

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Raymond, Kara, Laura Palacios, Cheryl McIntyre, and Evan Gwilliam. Status of climate and water resources at Chiricahua National Monument, Coronado National Memorial, and Fort Bowie National Historic Site: Water year 2019. National Park Service, May 2022. http://dx.doi.org/10.36967/nrr-2293370.

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Climate and hydrology are major drivers of ecosystems. They dramatically shape ecosystem structure and function, particularly in arid and semi-arid ecosystems. Understanding changes in climate, groundwater, and water quality and quantity is central to assessing the condition of park biota and key cultural resources. The Sonoran Desert Network collects data on climate, groundwater, and surface water at 11 National Park Service units in southern Arizona and New Mexico. This report provides an integrated look at climate, groundwater, and springs conditions at Chiricahua National Monument (NM), Coronado National Memorial (NMem), and Fort Bowie National Historic Site (NHS) during water year (WY) 2019 (October 2018–September 2019). Overall annual precipitation at Chiricahua NM and Coronado NMem in WY2019 was approximately the same as the normals for 1981–2010. (The weather station at Fort Bowie NHS had missing values on 275 days, so data were not presented for that park.) Fall and winter rains were greater than normal. The monsoon season was generally weaker than normal, but storm events related to Hurricane Lorena led to increased late-season rain in September. Mean monthly maximum temperatures were generally cooler than normal at Chiricahua, whereas mean monthly minimum temperatures were warmer than normal. Temperatures at Coronado were more variable relative to normal. The reconnaissance drought index (RDI) indicated that Chiricahua NM was slightly wetter than normal. (The WY2019 RDI could not be calculated for Coronado NMem due to missing data.) The five-year moving mean of annual precipitation showed both park units were experiencing a minor multi-year precipitation deficit relative to the 39-year average. Mean groundwater levels in WY2019 increased at Fort Bowie NHS, and at two of three wells monitored at Chiricahua NM, compared to WY2018. Levels in the third well at Chiricahua slightly decreased. By contrast, water levels declined in five of six wells at Coronado NMem over the same period, with the sixth well showing a slight increase over WY2018. Over the monitoring record (2007–present), groundwater levels at Chiricahua have been fairly stable, with seasonal variability likely caused by transpiration losses and recharge from runoff events in Bonita Creek. At Fort Bowie’s WSW-2, mean groundwater level was also relatively stable from 2004 to 2019, excluding temporary drops due to routine pumping. At Coronado, four of the six wells demonstrated increases (+0.30 to 11.65 ft) in water level compared to the earliest available measurements. Only WSW-2 and Baumkirchner #3 have shown net declines (-17.31 and -3.80 feet, respectively) at that park. Springs were monitored at nine sites in WY2019 (four sites at Chiricahua NM; three at Coronado NMem, and two at Fort Bowie NHS). Most springs had relatively few indications of anthropogenic or natural disturbance. Anthropogenic disturbance included modifications to flow, such as dams, berms, or spring boxes. Examples of natural disturbance included game trails, scat, or evidence of flooding. Crews observed 0–6 facultative/obligate wetland plant taxa and 0–3 invasive non-native species at each spring. Across the springs, crews observed six non-native plant species: common mullein (Verbascum thapsus), spiny sowthistle (Sonchus asper), common sowthistle (Sonchus oleraceus), Lehmann lovegrass (Eragrostis lehmanniana), rabbitsfoot grass (Polypogon monspeliensis), and red brome (Bromus rubens). Baseline data on water quality and water chemistry were collected at all nine sites. It is likely that that all nine springs had surface water for at least some part of WY2019, though temperature sensors failed at two sites. The seven sites with continuous sensor data had water present for most of the year. Discharge was measured at eight sites and ranged from < 1 L/minute to 16.5 L/minute.

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