Thematische Bibliographien / High speed pump

Inhaltsverzeichnis

  1. Zeitschriftenartikel
  2. Dissertationen
  3. Bücher
  4. Buchteile
  5. Konferenzberichte
  6. Berichte der Organisationen

Auswahl der wissenschaftlichen Literatur zum Thema „High speed pump“

Autor: Grafiati
Veröffentlicht am 28. Juni 2021
Zuletzt aktualisiert am 8. Februar 2022

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Zeitschriftenartikel zum Thema "High speed pump"

1

Shui, Qingjiao, Ting Jiang, Binghui Pan, Tianxing Yang und Wei Pan. „Numerical Research on Performance of High-Speed Partial Emission Pump“. Shock and Vibration 2021 (18.01.2021): 1–11. http://dx.doi.org/10.1155/2021/6697063.

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The high-speed partial emission pump is a small flow and high-head pump, which has been widely used. To study the main factors affecting the performance of high-speed partial emission pumps, numerical simulation methods were used to calculate the performance parameters of high-speed partial emission pumps with and without inducers, and the external characteristic parameters were verified through comparison test values. The results show that the head of the high-speed partial emission pump with inducer is nearly 15 m higher than that of the high-speed partial emission pump without inducer. Considering the influence of air in the high-speed partial emission pump on the working performance, the two-phase flow with different flow rates, different particle sizes, and different concentrations was calculated, and the different liquid phase distributions, liquid phase velocity vector diagrams, and external characteristic curve were compared. The results show that under the same flow condition, the gas-phase particle diameter has the most severe influence on the external characteristic.
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2

Harris, R. M., K. A. Edge und D. G. Tilley. „The Suction Dynamics of Positive Displacement Axial Piston Pumps“. Journal of Dynamic Systems, Measurement, and Control 116, Nr. 2 (01.06.1994): 281–87. http://dx.doi.org/10.1115/1.2899221.

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The suction dynamics of axial piston pumps become more critical if the pump is to be used at high speeds. In order to prevent air-release and cavitation from occurring within the pump it is necessary to pressurise the pump inlet. As the speed of a pump is increased, higher boost pressures are required, due to the extra losses incurred through the suction line and portplate at the higher flowrates. However, the lack of data regarding axial piston pump behavior at high speeds creates problems for the system designer in selecting suitable boost conditions and for the pump designer in selecting the portplate configuration that is required to reduce fluid-borne-noise levels. This paper discusses the suction performance of piston pumps, and presents experimental and simulation results exploring the behavior of a high-speed axial-piston pump. Different air-release and cavitation models that are suitable for simulation studies are investigated.
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3

Kamijo, Kenjiro, und Kunio Hirata. „Performance of Small High Speed Cryogenic Pumps“. Journal of Fluids Engineering 107, Nr. 2 (01.06.1985): 197–203. http://dx.doi.org/10.1115/1.3242460.

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Several small cryogenic pumps for a liquid rocket engine have been made and tested. These pumps have a small impeller and are characterized by high speed and high head. The main design characteristics of these pumps are as follows: stage specific speeds of from 0.0319 to 0.0766, flow rates from 0.016 to 0.0525 m3/s, pressure rises from 4.9 to 26 MPa, rotational speeds from 16,500 to 80,000 rpm, and impeller diameters from 0.083 to 0.146 m. These pumps, when tested, showed higher efficiency even in the range of small stage specific speeds than any previously reported data on other pumps. This tendency was particularly striking with the two-stage pumps. With regard to pump efficiency measurement, it was made clear that adiabatic efficiency was utilizable for the present cryogenic pumps. The relationship between the adiabatic efficiency and ordinary efficiency was also confirmed by a brief calculation and test results.
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4

Bai, Yuxing, Fanyu Kong, Fei Zhao, Jiaqiong Wang, Bin Xia und Qianlan Hu. „Experiments and Numerical Simulation of Performances and Internal Flow for High-Speed Rescue Pump with Variable Speeds“. Mathematical Problems in Engineering 2018 (02.07.2018): 1–18. http://dx.doi.org/10.1155/2018/9168694.

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The model pump is a high-speed, high-power pump designed to achieve rapid mine flooding rescue. This study conducted experiments to investigate pump performance curves, including head, efficiency, and power for the following six different rotation speeds: 3000, 3600, 4200, 4800, 5400, and 6000 rpm. Then, the numerical simulation method based on computational fluid dynamics commercial code Ansys was used to present the internal flow of the pump for the six different rotation speeds through steady and unsteady analyses. Results show that the numerical results agree well with experimental data. The designs of outlet and inlet angles of the impeller match each other well at high rotation speeds. The pressure pulsation coefficient Cp in the impeller and the diffuser channel remain constant at the same monitor point under different rotation speed conditions. The varying trend of the pressure-augmented coefficient ΔP indicates that, with the increase in rotation speed, the effect on pressure rise induced by the back part of the impeller channel is more evident than that by the front part. Also, the main frequency components of ΔP are concentrated on the region with low frequency. Moreover, the rotation speed has no significant effect on ΔP in the diffuser region. This study provides effective guidance and valuable reference for the design of high-speed, high-power pumps.
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5

Zagar, Philipp, Helmut Kogler, Rudolf Scheidl und Bernd Winkler. „Hydraulic Switching Control Supplementing Speed Variable Hydraulic Drives“. Actuators 9, Nr. 4 (04.12.2020): 129. http://dx.doi.org/10.3390/act9040129.

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Primary control of linear motion by variable speed electric motors driving a hydraulic cylinder via a constant displacement pump is an established and successful concept with a frequent use in industry. One problem arises when low or zero motion speed has to be realized under high pump pressure conditions. Such load scenarios occur frequently in certain pressing processes, e.g., for sintering or veneering. Most pumps have a lower speed limit, below which critical tribological conditions occur which impair lifespan and efficiency. In addition, pump speed control and pump fluctuation suffer from the mixed lubrication conditions in such an operation range. For a circumvention of such low speed pump operation, a digital valve control concept is presented and studied in this paper. Valve control is used in load holding phases with low speed. Pressure is provided by an accumulator which is charged by the pump in short charging cycles at reasonable pump speeds. It is shown that the mean control error during load holding phase lies within the desired band and the fluctuations of the control force are lower than those of the pump control. In addition, the unfavorable pump operation conditions can be avoided via digital control.
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6

Liu, Jun, Jian Ping Yuan und Wei Jie Zhang. „Fluid Mechanics Analysis and Effect of Splitter Blades on the Characteristics of High-Speed Centrifugal Pump“. Advanced Materials Research 676 (März 2013): 124–29. http://dx.doi.org/10.4028/www.scientific.net/amr.676.124.

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Due to its single-stage high head, compact structure, convenient maintenance, low cost and high reliability, the high-speed centrifugal pump has been widely used in refining, petrochemical, chemical industry, and aerospace engineering fields. However, as the speed increases, the increasingly high demand for stability is showing and cavitation characteristics of the high-speed centrifugal pump is emerging. Reducing the mechanical vibration, hydraulic losses and improving the pressure distribution of the high-speed pump have become one of the main research fields for high-speed pumps. Three types of splitter blades were designed in this paper. Numerical simulations of the 3D steady flow in the high-speed pump have been carried out by using the software ANSYS CFX 12.0 and the comparative analysis of the velocity, pressure distributions and fluid mechanics in the high-speed pump under three different flow conditions were also carried out，Respectively. The effects of splitter blades on the high-speed pump performance were studied by analyzing both its inner flow field and hydraulic performance. The calculated H-Q curve of the high-speed pump was compared with the test results, and they agreed well with each other. The relative error of head at design conditions was lower than that at the non-design conditions.
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7

Bai, Yuxing, Fanyu Kong, Bin Xia, Fei Zhao und Yingying Liu. „Effects of Impeller Diameter on High-Speed Rescue Pump“. Mathematical Problems in Engineering 2017 (2017): 1–15. http://dx.doi.org/10.1155/2017/1387210.

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Impeller diameter is a crucial design parameter of high-speed rescue pumps because it affects the performance and inner flow characteristics of these pumps. In this study, a pump with an impeller diameter of 248 mm was modeled and its performance was tested. Numerical simulations were conducted under steady and unsteady states, in which the sizes of the impeller diameters were designated as 248 mm (original), 235.6 mm (5% trimmed), 223.2 mm (10% trimmed), and 210.8 mm (15% trimmed). ANSYS software was used to test the shear stress transport (SST k-ω) of the four models, and results agreed well with experimental data. Diameter size affected impeller characteristics in both steady and unsteady states. Subsequently, the differences in performance, hydraulic loss, pressure pulsation, and radial force of the impellers were evaluated. In the performance test, the head and efficiency of the pump decreased as impeller diameter was reduced. The result trends are in accordance with the trim law within the acceptable error range. In terms of hydraulic loss, the impeller and diffuser vane components presented opposite trends with flow rate increase. Finally, in terms of pressure pulsation and radial force, the amplitude diminished while periodicity improved as impeller diameter decreased.
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Wu, Xian Fang, Hou Lin Liu, Ming Gao Tan und Hong Hui Li. „Design and Test for High Specific Speed Mixed Flow Pump with Volute“. Advanced Materials Research 354-355 (Oktober 2011): 669–73. http://dx.doi.org/10.4028/www.scientific.net/amr.354-355.669.

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The characteristics and research actuality on mixed flow pumps are introduced simplely. A mixed flow pump with volute as diffusion part is designed and its specific speed is 556.8. The axial velocity circulation and blade angle variety with linearity distribution are used to deisign the impeller. The fixed diffeuser between impeller and volute is deigned by arc airfoil.The cross sections of volute are all asymmetry. The commercial code FLUENT is applied to simulate the inner flow in the mixed flow pump and its energy characteristics are predicted according to the simulation results. The inner flow analysis indicates that the flow in the pump is good and the characteristic prediction shows that the pump performance can meet the design demand. The experiment test of the pump are done. When the blade angle is about 0°, the maximum efficiency of the pump is up to 85.76% and the actual efficiency at design point is about 3% higher than demand efficiency. The study fruits can instruct the hydraulic design of higher specific speed mixed flow pump with volute as diffusion part.
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Wen, De Sheng, Zhi Li Wang, Shi Jun Lv, Jiang Bo Sun und Li Bin Du. „Rotational Speed and Noise Level due to Distribution Oil Window Size of Three Type Pumps“. Applied Mechanics and Materials 29-32 (August 2010): 1246–51. http://dx.doi.org/10.4028/www.scientific.net/amm.29-32.1246.

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In this paper, a new hydraulic pump was presented, called KZB pump which has obtained the national patent of invention (patent number: 85103289.3). Originally comes from CY series pumps that are common used at present, KZB pump shows many advantages, such as high pressure, high efficiency, and long service life etc. This paper focuses on the rotational speed and noise level analysis of this new pump. Firstly, we described the configuration of both semi-open and full-open axial piston pumps in detail, which both of them were all new pumps and the later was also called KZB pump. Next, we investigated the distribution oil window size that influences the pump's rotational speed and noise level mostly by mathematical analysis. Finally, the analysis and comparisons of the rotational speed and noise level performances for the three type pumps which mentioned above were made. It is proved through the test that under the same working conditions KZB pump has made great advanced in controlling noise and having lower self-absorption rotational speed compared with the other type pumps.
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Wang, Chun Lin, Chang Jun Li, Jian Ding und Dong Liu. „Circulation Distribution of High Specific Speed Mixed-Flow Pump“. Applied Mechanics and Materials 130-134 (Oktober 2011): 1982–85. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.1982.

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The load distribution of the impeller and the shape of blade bone surface as well as the pump performance are determined by the circulation distribution from the impeller inlet to the outlet. However, perfect conclusions about optimal forms of the circulation distribution have not been seen yet. In this paper, three kinds of circulation distributions were studied. Three mixed flow pump impellers with high specific speed were designed according to the circulation distributions, and the models of the three pumps were built and modeled in the commercial CFD code ANSYS-CFX 11.0. The flow field in the pumps has been investigated using large eddy simulation (LES). Experiment was carried out on one model. And the performance curves predicted by LES were compared with the experimental data, and good agreements were achieved. The results show that: there is a low pressure area at impeller outlet. The pressure distribution along the circumferential direction was asymmetry at the front-end area of guide vanes, but it becomes uniform at the end of guide vane. The bearing pressure on the pressure side of the model 2 is lower, and the pressure distribution of model 1 is more asymmetry and there is a clear low pressure area at outlet of blade; Cavitation performance of model 2 is better, and the maximum efficiency is also the highest, but the hump is more serious; Model 1 has a widest area of high effective area.
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Dissertationen zum Thema "High speed pump"

1

Kaupert, Kevin A. „Unsteady flow fields in a high specific speed centrifugal pump /“. Zürich, 1997. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=12068.

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2

Hoefer, Ulrike Martina. „Design and development of a high-speed motor for a vacuum pump“. Thesis, University of Newcastle Upon Tyne, 2008. http://hdl.handle.net/10443/758.

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Turbomolecular pumps require a motor to drive them at speeds of up to 90,000 rpm. These high-speed motors are typically brushless permanent magnet motors that are specifically designed for the application. Intellectual property rights over the design lock the company into one single supplier. Also low manufacturing volumes make the motor expensive to produce. To stay competitive continuous cost reductions or product improvements are necessary. This can only be achieved by looking at new materials, alternative manufacturing methods and simplified assembly processes. The aim of this project is to replace an existing laminated, high-speed (60,000rpm) motor with a new low-cost design. Special considerations need to be given to the motor design with regards to minimising losses due to the high operating speed and the fact that the motor operates in a vacuum. A machine design employing a simple, 3-tooth segmented stator made from soft magnetic composites (SMC) and using non-overlapping coils, and a `deep' plastic bonded magnet on the rotor is proposed to deliver low rotor losses and low manufacturing costs. Four SMC prototype motors have been built, which have led to the following discoveries: (1) Bulk eddy currents in the SMC material cannot be neglected and need to be taken into account separately as a function of the actual component size and shape. (2) A process is suggested to improve the iron loss calculation in SMC, which is evaluated against the prototypes built. (3) SMC material properties are adversely affected by prototype machining, leading to higher iron losses than initially expected. (4) The segmented SMC design has proven to be commercially very attractive. During testing a large sensitivity of the magnetically supported pump shaft to the inherent unbalanced magnetic pull (UMP) force of the 3-tooth, 2-pole design was discovered. This led to a practical and theoretical study into the effects of UMP in this application. An alternative design that avoided the inherent UMP was required, and a 6- tooth, 4-pole motor has been designed and built. For reasons of minimising risks laminations were chosen as the stator material rather than SMC. Test results of this motor in the pump have been successful and the motor has been selected to go into the next generation of turbomolecular pumps.
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Lee, Seong-Ryeol, Florian Schoemacker, Christian Stammen und Katharina Schmitz. „Numerical and experimental study on novel hydraulic pump concept“. Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71110.

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This paper discusses an investigation on a novel hydraulic pump concept. The idea aims on a pump principle to be directly connected to high-speed electric motors to build compact high-pressure drives. The pump can theoretically work without solid contact and has no kinematic pulsation. The composition of the pump is basically similar to cylindrical journal bearings. In general, a journal bearing is used to support external loads on a rotating shaft. When the shaft rotates with the loads, hydrodynamic fluid force is generated in the fluid film, which compensates the external force and reduces an eccentricity of the shaft. The difference of the introduced pump concept from the bearing is that the eccentricity is fixed and it has an outlet port at the high pressure area, through which the fluid can be transferred. To examine the functionality of the pump, a test bench is constructed and experiments are performed to investigate the pressure build-up and discharging flow of the pump concept. The experimental results are numerically analyzed by using elasto-hydrodynamic lubrication (EHL) simulation, based on the 2D Reynold’s equation. From these results, the functionality of the pump concept is confirmed. Moreover, several variables that influence the characteristic curve of the pump are studied. Based on these results, geometric parameters of the test pump are redesigned to discharge sufficient flow rate for usage as commercial pumps.
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4

Kadlec, Jan. „Hydraulický návrh induceru palivového čerpadla pro raketový motor“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444265.

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The aim of this masters thesis is hydraulic design of inducer for given pump geometry and operating parameters. The first part of this thesis deals with cavitation problematic in hydrodynamic pumps. Next section describes two-dimensional design of the inducer and according to that, the 3D CAD model of inducer is made. The later part deals with thorough CFD analysis and determination of the main hydraulic parameters of inducer itself and also with whole pump completed with this inducer. The last section is devoted to inducer design improvement.
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5

Dupoiron, Marine Agnes Nicole. „The effect of gas on multi-stage mixed-flow centrifugal pumps“. Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/273361.

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The production from an oil reservoir is a mixture of liquids (oil and water) and gas, and is often maintained by using a pump placed in the well to ensure a continuous flow to the surface. Electrical Submersible Pumps consist of stacked centrifugal pump stages, each comprising a bladed impeller (rotating part) and diffuser (stationary part). In multiphase conditions, the gas tends to accumulate in the impeller, severely reducing the pressure produced by the pump. Radial-flow pumps operate in a plane perpendicular to their rotation axis, while mixed-flow pumps are characterised by a lower meridional angle (generally 40 to 80 degrees), and are generally better at handling gas-liquid mixtures. We first describe the impact of gas on the whole pumping system, from the reservoir to the storage facility, and give context to the subject. The available literature shows that the size of the gas bubbles present in the fluid is critical to the pump performance. A transparent, full-scale pump was built in order to explore the flow features in single and multiphase flows. Laser Doppler Velocimetry and high speed imaging in single phase flow showed a high turbulence level in the wake of the impeller blades, and recirculation cells at low flow rates. In gas-liquid conditions, we demonstrated that the bubble size varies within a pump stage, as break-up occurs at the impeller tip, and coalescence is dominant in the diffuser, especially because of recirculation. The first impeller acted as a mixer, and at moderate to high gas fractions (10 to 30%), the flow patterns at the stage level alternated between bubbly and radially separated flows. Finally, a dispersed-gas model was developed to predict the pressure rise in a mixed-flow pump impeller under gas-liquid conditions. This model based on the forces acting on a single spherical gas bubble, was implemented with a simplified, parametric representation of the flow field in a mixed-flow impeller. In the meridional direction, the Coriolis force opposes the centrifugal force and the adverse pressure gradient. Both forces tend to retain the gas bubble within the impeller. The relative magnitude of the drag force strongly depends on the maximal bubble diameter, which was determined as a function of the flow conditions and used to calculate the gas velocity through the impeller. This method resulted in a better agreement with the experimental data than a one-dimensional two-fluid model where the gas phase follows the same path as the liquid. We used the dispersed-gas model to give quantitative evidence that low blade and meridional angles reduce the gas accumulation and the associated performance degradation.
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6

Hartley, William H. „High-Speed Imaging of Polymer Induced Fiber Flocculation“. Thesis, Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/14627.

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This study presents quantitative results on the effect on individual fiber length during fiber flocculation. Flocculation was induced by a cationic polyacrylamide (cPAM). A high speed camera recorded 25 second video clips. The videos were image-analyzed and the fiber length and the amount of fiber in each sample were measured. Prior to the flocculation process, fibers were fractionated into short and long fibers. Trials were conducted using the unfractionated fiber, short fiber, and long fiber. The short and long fibers were mixed in several trials to study the effect of fiber length. The concentration of cPAM was varied as well as the motor speed of the impeller (RPM). It was found that the average fiber length decreased more rapidly with increasing motor speed. Increasing the concentration of cPAM also led to a greater decrease in average fiber length. A key finding was that a plateau was reached where further increasing the amount of cPAM had no effect. Hence, fibers below a critical length resisted flocculation even if the chemical dose or shear was increased. This critical length was related to the initial length of the fiber.
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Kina, João Fernando. „Análise histopatológica comparativa de polpas humanas após confecção de cavidades de classe I com turbina de alta velocidade ou laser de Er:YAG /“. Araraquara : [s.n.], 2008. http://hdl.handle.net/11449/101371.

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Orientador: Carlos Alberto de Souza Costa
Banca: Elisa Maria Aparecida Giro
Banca: Marcelo Ferrarezi de Andrade
Banca: Marcelo Giannini
Banca: André Luiz Fraga Briso
Resumo: O objetivo da presente pesquisa foi avaliar comparativamente, através de análise histopatológica, as respostas de polpas humanas após confecção de cavidades de classe I, utilizando-se turbina de alta velocidade ou sistema laser de Er:YAG. Pré-molares inferiores hígidos recomendados para extração devido ao tratamento ortodôntico foram selecionados, sendo que os pares de dentes pertencentes aos mesmos pacientes foram aleatoriamente divididos de acordo com os seguintes grupos experimentais (n=6): Grupo 1 - alta velocidade; e Grupo 2 - laser de Er:YAG. As cavidades com profundidade média de 2,5mm tiveram a parede pulpar forrada com material biocompatível, sendo então restauradas com resina composta e sistema adesivo. No Grupo 3 (controle), os dentes não receberam qualquer tipo de tratamento. Quinze dias após a confecção e restauração das cavidades, os dentes foram extraídos, fixados em formalina tamponada, descalcificados em solução de Morse e processados em laboratório para inclusão em parafina. Cortes histológicos com 6μm de espessura foram corados com H/E, Tricrômico de Masson e pela técnica de Brown & Brenn e então avaliados em microscopia de luz. Para o Grupo 1 (alta velocidade), 5 dentes não apresentavam reação inflamatória, porém 3 deles exibiam discreta ruptura da camada de odontoblastos com degeneração hidrópica destas células pulpares. Em apenas 1 espécime, cuja espessura de dentina remanescente (EDR) entre o assoalho da cavidade e a polpa coronária era de 214μm, foi observado significante degeneração de odontoblastos, associado à ampla área de hialinização da matriz extracelular. Neste Grupo 1, as cavidades profundas apresentavam, em média, EDR de 909,5μm. Para o Grupo 2 (laser), exposição acidental da polpa ocorreu em 1 espécime, o qual foi descartado do experimento.
Abstract: The aim of this in vivo study was to evaluate and to compare the histopathological response of human pulps after cavity preparation by using high speed or Er:YAG laser systems. Sound premolars were selected and randomly divided into two experimental groups (n = 6) as following: Group 1: High speed; and Group 2: Er:YAG Laser. Class I cavities, 2.5mm deep, were prepared and their pulpal walls were lined with a biocompatible dental material. The cavities were restored with adhesive system and composite resin. Intact premolars were used in Group 3 (control). Fifteen days after the clinical procedures of cavity preparation, the teeth were extracted, fixed in 10% formalin, decalcified in Morse solution, and processed for paraffin embedding. The histological sections, 6μm thick, were stained with H/E, Masson's trichrome and Brown & Brenn technique and evaluated in light microscope. In Group 1 (High Speed), 5 specimens did not present inflammatory reaction. However, 3 of them exhibited odontoblast layer disruption as well as hydropic degeneration of these pulp cells. In only 1 specimen, which presented remaining dentin thickness (RDT) between the cavity floor and the coronary pulp of 214μm, notable odontoblast degeneration associated with hyaline alteration of the extracellular matrix was observed. In this Group 1 the mean of the RDT was 909.5μm. In Group 2 (Er:YAG Laser), unexpected pulp exposure occurred in 1 specimen, which was took out of the experiment. Four specimens exhibited normal histological characteristics of the pulp tissue. Only 1 specimen (RDT = 413μm) showed moderate tissue disorganization characterized by odontoblast layer disruption. The odontoblast cells exhibited hydropic degeneration. In this Group 2 the mean of the RDT was 935.2μm.
Doutor
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Kina, João Fernando [UNESP]. „Análise histopatológica comparativa de polpas humanas após confecção de cavidades de classe I com turbina de alta velocidade ou laser de Er:YAG“. Universidade Estadual Paulista (UNESP), 2008. http://hdl.handle.net/11449/101371.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
O objetivo da presente pesquisa foi avaliar comparativamente, através de análise histopatológica, as respostas de polpas humanas após confecção de cavidades de classe I, utilizando-se turbina de alta velocidade ou sistema laser de Er:YAG. Pré-molares inferiores hígidos recomendados para extração devido ao tratamento ortodôntico foram selecionados, sendo que os pares de dentes pertencentes aos mesmos pacientes foram aleatoriamente divididos de acordo com os seguintes grupos experimentais (n=6): Grupo 1 – alta velocidade; e Grupo 2 – laser de Er:YAG. As cavidades com profundidade média de 2,5mm tiveram a parede pulpar forrada com material biocompatível, sendo então restauradas com resina composta e sistema adesivo. No Grupo 3 (controle), os dentes não receberam qualquer tipo de tratamento. Quinze dias após a confecção e restauração das cavidades, os dentes foram extraídos, fixados em formalina tamponada, descalcificados em solução de Morse e processados em laboratório para inclusão em parafina. Cortes histológicos com 6μm de espessura foram corados com H/E, Tricrômico de Masson e pela técnica de Brown & Brenn e então avaliados em microscopia de luz. Para o Grupo 1 (alta velocidade), 5 dentes não apresentavam reação inflamatória, porém 3 deles exibiam discreta ruptura da camada de odontoblastos com degeneração hidrópica destas células pulpares. Em apenas 1 espécime, cuja espessura de dentina remanescente (EDR) entre o assoalho da cavidade e a polpa coronária era de 214μm, foi observado significante degeneração de odontoblastos, associado à ampla área de hialinização da matriz extracelular. Neste Grupo 1, as cavidades profundas apresentavam, em média, EDR de 909,5μm. Para o Grupo 2 (laser), exposição acidental da polpa ocorreu em 1 espécime, o qual foi descartado do experimento.
The aim of this in vivo study was to evaluate and to compare the histopathological response of human pulps after cavity preparation by using high speed or Er:YAG laser systems. Sound premolars were selected and randomly divided into two experimental groups (n = 6) as following: Group 1: High speed; and Group 2: Er:YAG Laser. Class I cavities, 2.5mm deep, were prepared and their pulpal walls were lined with a biocompatible dental material. The cavities were restored with adhesive system and composite resin. Intact premolars were used in Group 3 (control). Fifteen days after the clinical procedures of cavity preparation, the teeth were extracted, fixed in 10% formalin, decalcified in Morse solution, and processed for paraffin embedding. The histological sections, 6μm thick, were stained with H/E, Masson´s trichrome and Brown & Brenn technique and evaluated in light microscope. In Group 1 (High Speed), 5 specimens did not present inflammatory reaction. However, 3 of them exhibited odontoblast layer disruption as well as hydropic degeneration of these pulp cells. In only 1 specimen, which presented remaining dentin thickness (RDT) between the cavity floor and the coronary pulp of 214μm, notable odontoblast degeneration associated with hyaline alteration of the extracellular matrix was observed. In this Group 1 the mean of the RDT was 909.5μm. In Group 2 (Er:YAG Laser), unexpected pulp exposure occurred in 1 specimen, which was took out of the experiment. Four specimens exhibited normal histological characteristics of the pulp tissue. Only 1 specimen (RDT = 413μm) showed moderate tissue disorganization characterized by odontoblast layer disruption. The odontoblast cells exhibited hydropic degeneration. In this Group 2 the mean of the RDT was 935.2μm.
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Chu, Hung-Chen, und 朱宏鎮. „A High-speed Charge Pump with Two Charge Currents for PLL“. Thesis, 2006. http://ndltd.ncl.edu.tw/handle/01487085345502572809.

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碩士
中華大學
電機工程學系碩士班
94
In this thesis, we design a high speed phase-locked loop (PLL).The circuit is simulated and verified by Hspice with TSMC 0.18μm technology.A PLL consists of a phase frequency detector (PFD), a charge pump (CP), a loop filter (LF), a voltage controlled oscillator (VCO) and a divider. In PFD, we use a novel structure with symmetrical circuits to delete jitter. In CP , we use two charge currents to speed up lock time. In LF, we use a second order RC filter to make up. In VCO, we use the complementary cross-couple LC-tank to make up. In divider, the D flip-flop circuit is made by TSPC circuit. Finally, the PLL could be operated at 2.4GHz, and the lock time is between 6us~8us.
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Jirawattana, Piyoros. „Design, simulation, fabrication and testing of a low-speed high-torque (LSHT) pump/motor for a hydrostatic vehicle“. 2000. http://www.library.wisc.edu/databases/connect/dissertations.html.

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Bücher zum Thema "High speed pump"

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Hello, We have A4 paper 80 gsm and 70 gsm also we have A3 paper A4 paper in roll, ream.You can request for the specification of all the below paper.brightness 100% which is good for all office use. Brands: Double A4 copier paper $0. 85 Paperone copier paper $0. 85 Golden Star copier paper $0. 85 Laser / Copier Paper $0. 80 Multipurpose copy paper-- $0. 85 HP Multipurpose copy paper-- $0. 85 Golden Star copier paper $0. 80 Laser / Copier Paper $0. 80 Xeron multipurpose copy paper-- $0. 85 Mondi Rotritrim copy Paper-- $0. 85 IK Plus A4 Paper -- $0.85 IK Yellow A4 Paper -- $0.85 Specifications: Sheet Size:210mm x 297mm, International Size A4 Quality: Imported 100% Virgin Wood Pulp Whiteness = 102-104%,Natural White Capability: High Speed Copying100ppm, Laser Capable,Inkjet Capable, Fax Capable. 500 Sheets per Ream 5 Reams per Box 1560 Boxes per container(With Pallet) 1600 Boxes Per container( Without Pallet) 7800 Reams Total in one 20FCL( With Pallet) 8000 Reams Total in one 20FCL( Without Pallet) Regards Mohamed ALHAMDU SKYPE: usedlcdcpu MSN: usedlcdcpu@hotmail.com Tel:+60133024706 Fax.+60170080010 Email Address: celestiallinkssdnbhd@gmail.com: Hello, We have A4 paper 80 gsm and 70 gsm also we have A3 paper A4 paper in roll, ream.You can request for the specification of all the below paper.brightness 100% which is good for all office use. Brands: Double A4 copier paper $0. 85 Paperone copier paper $0. 85 Golden Star copier paper $0. 85 Laser / Copier Paper $0. 80 Multipurpose copy paper-- $0. 85 HP Multipurpose copy paper-- $0. 85 Golden Star copier paper $0. 80 Laser / Copier Paper $0. 80 Xeron multipurpose copy paper-- $0. 85 Mondi Rotritrim copy Paper-- $0. 85 IK Plus A4 Paper -- $0.85 IK Yellow A4 Paper -- $0.85 Specifications: Sheet Size:210mm x 297mm, International Size A4 Quality: Imported 100% Virgin Wood Pulp Whiteness = 102-104%,Natural White Capability: High Speed Copying100ppm, Laser Capable,Inkjet Capable, Fax Capable. 500 Sheets per Ream 5 Reams per Box 1560 Boxes per container(With Pallet) 1600 Boxes Per container( Without Pallet) 7800 Reams Total in one 20FCL( With Pallet) 8000 Reams Total in one 20FCL( Without Pallet) Regards Mohamed ALHAMDU SKYPE: usedlcdcpu MSN: usedlcdcpu@hotmail.com Tel:+60133024706 Fax.+60170080010 Email Address: celestiallinkssdnbhd@gmail.com. Mohamed, 2012.

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Buchteile zum Thema "High speed pump"

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Nakamura, T., H. Nishizawa, M. Yasuda, T. Suzuki und H. Tanaka. „Study on High Speed and High Head Reversible Pump -Turbine“. In Hydraulic Machinery and Cavitation, 210–19. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-010-9385-9_20.

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Yin, Yaobao. „High-Temperature and High-Speed Gas Turbine Pump Electro-Hydraulic Energy System for Aircraft“. In High Speed Pneumatic Theory and Technology Volume II, 51–161. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-2202-4_9.

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Karlsen, Haakon, und Tao Dong. „A Concept Study for a Compact High-Speed Rotation Heat Pump“. In Progress in Systems Engineering, 101–6. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-08422-0_15.

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Hati, Manas Kumar, und Tarun Kanti Bhattacharyya. „A High Speed, Low Jitter and Fast Acquisition CMOS Phase Frequency Detector for Charge Pump PLL“. In Progress in VLSI Design and Test, 166–71. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-31494-0_19.

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Liu, Xudong, Pengjie Li, Peipei Dong, Guoqiang Xu und Minghui Wang. „Low-speed Sensorless Control Method of SPMSM for Oil Pump Based on Improved Pulsating High-Frequency Voltage Injection“. In The Proceedings of the 9th Frontier Academic Forum of Electrical Engineering, 691–703. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6609-1_63.

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Guelich, J. F. „Cavitation Noise in Centrifugal Pumps“. In Vibration and Wear in High Speed Rotating Machinery, 87–112. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-1914-3_7.

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Larjola, Jaakko. „High Speed Pumps in Water Jet Cutting“. In Jet Cutting Technology, 319–28. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2678-6_21.

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Guelich, J. F. „Part Load Flow Phenomena and Excitation Forces in Centrifugal Pumps“. In Vibration and Wear in High Speed Rotating Machinery, 113–34. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-1914-3_8.

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Ortwig, Harald. „Wear Analysis of Vanes Pumps Running With Thickened High Water Based Fluids“. In Vibration and Wear in High Speed Rotating Machinery, 203–20. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-1914-3_12.

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Guelich, J. F. „Estimation of Erosion Rates and Implosion Pressures in Cavitating Pumps and Cavitation Test Devices“. In Vibration and Wear in High Speed Rotating Machinery, 135–52. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-1914-3_9.

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Konferenzberichte zum Thema "High speed pump"

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Gorlov, A., und A. Shakirov. „Ultra-High Speed ESP PMM System Application in Salym Petroleum Development“. In SPE Electric Submersible Pump Symposium. Society of Petroleum Engineers, 2017. http://dx.doi.org/10.2118/185143-ms.

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Yim, Taegun, Choongkeun Lee und Hongil Yoon. „A High Speed Modified Dickson Charge Pump“. In 2021 IEEE International Symposium on Circuits and Systems (ISCAS). IEEE, 2021. http://dx.doi.org/10.1109/iscas51556.2021.9401373.

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Wu, Xiu-Long, Jun-Ning Chen, Dao-Ming Ke und Xing-Jian Zhang. „Design of High-Speed Charge-Pump in PLL“. In 2008 4th International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM). IEEE, 2008. http://dx.doi.org/10.1109/wicom.2008.555.

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Kuroda, K., S. Sakuma, F. Arai und M. Kaneko. „High-speed cell manipulation by backlashless syringe pump“. In 2013 10th International Conference on Ubiquitous Robots and Ambient Intelligence (URAI). IEEE, 2013. http://dx.doi.org/10.1109/urai.2013.6677499.

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Balasubramanian, Nallannan, Titus Iwaszkiewicz und Jayabalan Sethuraman. „High speed visualization of gasoline pump injector (GPI)“. In ILASS2017 - 28th European Conference on Liquid Atomization and Spray Systems. Valencia: Universitat Politècnica València, 2017. http://dx.doi.org/10.4995/ilass2017.2017.4796.

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Two-wheeler engines still use carburetor as a fuelling system in many Asian countries, owing to its low cost andless maintenance. The usage of carburetor to handle the upcoming stringent emission norms gets difficult, due to the absence of a closed-loop fuel correction. An electronic fuel injector (EFI), on the other hand, with the help of an electronic control unit (ECU), can correct the fuel quantity and set the air-fuel mixture close to stoichiometric, based on the feedback obtained from the oxygen sensor placed in the exhaust pipe. In this context, an innovative injection system has been developed, that can be applied for such electronic fuel injection in two-wheelers. In this design, the pump and injector are integrated into a single unit, making the system, simple, compact and less expensive. The integrated injector uses a solenoid and spring arrangement, for pressurizing the fuel in a small chamber, and the pressurized fuel is then injected through orifices to produce spray in the intake port. Two-wheeler engines can operate in the order of 10,000 rpm and it poses a big challenge in such injector designs, and therefore the time response of the mechanical and magnetic components of the injector become critical. High-speed back-lit imaging helps in understanding the time response of such injector, by visualizing the spray, while injecting continuously over a period of time. This paper presents the results of high-speed images, obtained from the spray of this new-concept gasoline pump injector (GPI). This exercise, demonstrated that this injector can work at a frequency as high as 83 Hz and also consistently. The spray pattern was found to be very unique and different from the conventional PFIinjection sprays.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.4796
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Huili Xu und Zhiqun Li. „Design of a low power charge pump circuit for phase-locked loops“. In 2012 4th International High Speed Intelligent Communication Forum (HSIC). IEEE, 2012. http://dx.doi.org/10.1109/hsic.2012.6213018.

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Xue, Liqin, und Zipeng Zhang. „Differential charge pump circuit for high speed PLL application“. In Applications (ISIEA 2009). IEEE, 2009. http://dx.doi.org/10.1109/isiea.2009.5356317.

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Mosher, Phillip, Joseph Scharrer und Lyn Greenhill. „Development of a high speed pump impeller test apparatus“. In 31st Joint Propulsion Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1995. http://dx.doi.org/10.2514/6.1995-2406.

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Horn, Alexander, Hooman Khajehnouri, Ernst-Wolfgang Kreutz und Reinhart Poprawe. „Ultrafast pump and probe investigations on the interaction of femtosecond laser pulses with glass“. In 25th international Congress on High-Speed photography and Photonics, herausgegeben von Claude Cavailler, Graham P. Haddleton und Manfred Hugenschmidt. SPIE, 2003. http://dx.doi.org/10.1117/12.516935.

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Shi, Hai-xia, Yu-jie He, Jian-bo Wu und Qiang Li. „Numeric Analysis on Internal Flow of High-Speed Pump of Different Structural Style“. In ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30405.

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In order to study the effect of the structural style of high-speed pump on internal flow, 4 types high-speed pump of different structural style are selected for comprehensive analysis, S-A turbulence model and SIMPLIEC algorithm are adopted for numerical simulation of internal flow. By comprehensively comparing the static pressure, total pressure, sectional velocity vector and flow path line, two types of high-speed pumps with cylindrical-blade impeller matching nozzle type pump casing have relatively ideal pressure field and flow condition, can reduce hydraulic loss. The comprehensive performance of 4 types of high-speed pump is predicted through computational simulation, the high-speed pump with open cylindrical-blade impeller matching nozzle type pump casing has most excellent performance, indicating the structural style of high-speed pump has effect on its internal flow and performance.
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Berichte der Organisationen zum Thema "High speed pump"

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Payne, W. Vance, und Brian P. Dougherty. A side-by-side energy use comparison of a variable-speed small duct high velocity and two-stage conventional ducted heat pump in a net-zero energy home. Gaithersburg, MD: National Institute of Standards and Technology, Juli 2020. http://dx.doi.org/10.6028/nist.tn.2101.

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