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Journal articles on the topic 'Powerflow'

Author: Grafiati

Published: 4 June 2021

Last updated: 4 February 2022

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1

Zhao, Qun, Chen Zhang, and Jin Fang Zhao. "Design of Double-Deck Isolation Systems." Advanced Materials Research 118-120 (June 2010): 389–93. http://dx.doi.org/10.4028/www.scientific.net/amr.118-120.389.

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On the basis of the powerflow theory and four-end parameter analysis method, the responses and the powerflow characteristics of the vibration transfer path system are examined. The sensitivity of non-linear damping is employed as measurement criterion. The powerflow and powerflow sensitivity are obtained and the effect on powerflow and powerflow sensitivity of dry friction damping, fluid damping and structural damping is studied. Numerical results are also presented and discussed. It is supposed to study the sensitivity of these parameters, to estimate the effect of the change of parameters, to improve the design performance.

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2

Shestakova, V. V., I. M. Kats, and A. V. Darkhanova. "Powerflow calculations in powersystems considering traction load." IOP Conference Series: Materials Science and Engineering 1019 (January 21, 2021): 012004. http://dx.doi.org/10.1088/1757-899x/1019/1/012004.

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3

Sun, Chenghai, Franck Pérot, Raoyang Zhang, David M. Freed, and Hudong Chen. "Impedance Boundary Condition for Lattice Boltzmann Model." Communications in Computational Physics 13, no. 3 (March 2013): 757–68. http://dx.doi.org/10.4208/cicp.421011.260112s.

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AbstractA surface based lattice Boltzmann impedance boundary condition (BC) using Ozyoruk’s model [J. Comput. Phys., 146 (1998), pp. 29-57] is proposed and implemented in PowerFLOW. In Ozyoruk’s model, pressure fluctuation is directly linked to normal velocity on an impedance surface. In the present study, the relation between pressure and normal velocity is realized precisely by imposing a mass flux on the surface. This impedance BC is generalized and can handle complex geometry. Combined with the turbulence model in the lattice Boltzmann solver PowerFLOW, this BC can be used to model the effect of a liner in presence of a complex 3D turbulent flow. Preliminary simulations of the NASA Langley grazing flow tube and Kundt tube show satisfying agreement with experimental results.

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4

Choi, Eui-Sung, and Stephane Cyr. "PowerFLOW Simulation of the Hyundai Simple Model for Sunroof Buffeting." Transactions of the Korean Society for Noise and Vibration Engineering 24, no. 3 (March 20, 2014): 189–97. http://dx.doi.org/10.5050/ksnve.2014.24.3.189.

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5

Garrity, Danielle, Molly Graves, Jeanne Linden, Patricia St. Pierre, Paula Ducharme, Yong Zhao, Mindy Greene, Michelle Vauthrin, and Robert Weinstein. "Performance characteristics of the PowerFlow apheresis port: Early experience." Journal of Clinical Apheresis 34, no. 6 (August 19, 2019): 661–65. http://dx.doi.org/10.1002/jca.21743.

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6

König, Benedikt, and Ehab Fares. "Exa PowerFLOW Simulations for the Sixth AIAA Drag Prediction Workshop." Journal of Aircraft 55, no. 4 (July 2018): 1482–90. http://dx.doi.org/10.2514/1.c034480.

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7

Arabi, S., and P. Kundur. "A versatile FACTS device model for powerflow and stability simulations." IEEE Transactions on Power Systems 11, no. 4 (1996): 1944–50. http://dx.doi.org/10.1109/59.544668.

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8

Moskalenko, A. A. "STUDY OF THE PHYSICAL AND MECHANICAL CHARACTERISTICS OF HIGHLY FILLED SLAG-CONTAINING CEMENTS MODIFIED WITH ORGANIC-MINERAL ADDITIVES PRODUCED BY BAUCHEMI." Bulletin of Odessa State Academy of Civil Engineering and Architecture, no. 81 (December 7, 2020): 129–38. http://dx.doi.org/10.31650/2415-377x-2020-81-129-138.

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Abstract. The physical and mechanical characteristics of highly filled slag cements modified by the organic-mineral complex of LLC “MC Bauhemi” have been investigated. As a result of optimization, the area of permissible concentrations of organic-mineral additives was established according to the maximum criteria for the timing of the beginning and end of setting and strength in compression at the age of 7 and 28 days. It is shown that the expansion of the beginning of setting and its end is positively influenced by the presence of the plasticizer MC-PowerFlow 2695 from 0.43 to 0.8% and the organic-mineral complex Centrilit NC and Centrilit Fume SX in an amount from 3 / 5.25 to 5.2 / 7%, that with a simultaneous increase in the slag content from 50 to 70% in the composition of Portland cement, the start-end time of setting increases from 225/250 to 320/330 minutes, which is 1.3 / 1.5 times higher than similar indicators of no additive Portland cement. It was noted that at the age of 7 and 28 days, the introduction of an organic-mineral complex of the composition MC-PowerFlow 2695 from 0.28 to 0.64%, Centrilit NC from 4.23 to 7% and Centrilit Fume SX from 3 to 7% and at the content of GDSH in the amount of 50 and 70% contributes to the production of an artificial stone of the M500 brand with compressive strength in the range of 47 / 52.8 and 46/48 MPa. Using the method of superposition of response functions, the optimal area of permissible concentrations of the components of the Bauhemi organic-mineral complex, affecting the stated criteria, was determined when the slag content in Portland cement was 50 and 70%, namely: 0.6% MC-PowerFlow 2695, 5% Centrilit NC and 5 % Centrilit Fume SX. Further research will be aimed at studying the effect of this complex on the physical and mechanical properties with a slag content of 50 and 70% in the composition of Portland cement.

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9

Gill, Janique C., Darlene J. Oakley, and Oluwatoyosi A. Onwuemene. "Strategies to Aid Identification of Apheresis PowerFlow Ports: A Case Report." Journal of Emergency Nursing 47, no. 1 (January 2021): 21–27. http://dx.doi.org/10.1016/j.jen.2020.10.004.

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10

Williams, Lance A., Michael N. Boshell, Jill Adamski, Huy P. Pham, Bryan Guillory, James Sikora, Stephanie Lisby, Ashley Lovingood, X. Long Zheng, and Marisa B. Marques. "Exclusive use of PowerFlow ports may not be appropriate for all patients." Journal of Clinical Apheresis 35, no. 1 (September 18, 2019): 66–68. http://dx.doi.org/10.1002/jca.21749.

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11

Vatsa, Veer N., Damiano Casalino, John C. Lin, and Jason Appelbaum. "Simulation of a High-Lift Configuration Embedded with Fluidic Actuators Using PowerFLOW Code." International Journal of Flow Control 6, no. 4 (December 2014): 147–70. http://dx.doi.org/10.1260/1756-8250.6.4.147.

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12

Kartha, Satish C., Marty E. Johnson, and Chris R. Fuller. "Reduction of total powerflow in a fluid filled pipe using an active/passive approach." Journal of the Acoustical Society of America 104, no. 3 (September 1998): 1852. http://dx.doi.org/10.1121/1.424469.

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13

Elizondo, Marcelo A., Francis K. Tuffner, and Kevin P. Schneider. "Three-Phase Unbalanced Transient Dynamics and Powerflow for Modeling Distribution Systems With Synchronous Machines." IEEE Transactions on Power Systems 31, no. 1 (January 2016): 105–15. http://dx.doi.org/10.1109/tpwrs.2015.2389712.

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14

Jahani, R., A. Safari, J. Olamaei, and H. A. Shayanfar. "Using A New Hybrid Method for Optimal Placement of Unified PowerFlow Controller in Power System." International Journal of Electrical and Power Engineering 4, no. 3 (March 1, 2010): 169–76. http://dx.doi.org/10.3923/ijepe.2010.169.176.

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15

Zhang, S. "Enhanced Newton-Raphson algorithm for normal, controlled and optimal powerflow solutions using column exchange techniques." IEE Proceedings - Generation, Transmission and Distribution 141, no. 6 (1994): 647. http://dx.doi.org/10.1049/ip-gtd:19941479.

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16

Macijauskas, Mindaugas, and Albinas Gailius. "INFLUENCE OF CEMENT TYPE AND ADMIXTURES ON RHEOLOGICAL PROPERTIES OF CEMENT PASTE / CHEMINIŲ ĮMAIŠŲ POVEIKIS REOLOGINĖMS CEMENTO TEŠLOS SAVYBĖMS." Engineering Structures and Technologies 5, no. 4 (May 8, 2014): 175–81. http://dx.doi.org/10.3846/2029882x.2014.912431.

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The article aims to research the influence of the chemical admixtures on the rheological properties of Portland cement paste and determine their impact on the effectiveness of hydration induction period. Materials used in the study: Portland cement CEM I 42.5 (N and R early strength), limestone Portland cement CEM II/A-LL 42.5 N, plasticizer Centrament N3, the latest generation superplasticizer MC-PowerFlow 3140 and water. Investigations focused on effects of Plasticizer and superplasticizer on water and cement (W/C) ratio and Portland cement paste flow characteristics. Portland cement pastes with the same watercement ratio with and without chemical admixtures were tested. Investigations were carried out using a Suttard viscometer and rotation viscometer Rheotest NH 4.1 with coaxial cylinders. It was observed that viscosity of Portland cement paste can be controlled by chemical admixtures during the hydration induction period. Investigations of effectiveness of the chemical admixtures on the rheological properties of the Portland cement pastes, comparing it with a control composition of the Portland cement paste were provided in the article. Diagrams show changes of the viscosity of the Portland cement pastes depending on the type and amount of the used chemical admixtures. Obtained results were compared with the same consistence without admixtures. After making the regressive analysis of research results of Portland cement paste with and without chemical admixtures, empirical equations were produced. Santrauka Šio darbo tikslas – ištirti cheminių įmaišų poveikį reologinėms portlandcemenčio tešlų savybėms ir nustatyti jų poveikio veiksmingumą indukcinio hidratacijos periodo metu. Tyrimams naudotos šios medžiagos: AB „Akmenės cementas“ gamyklos portlandcementis CEM I 42,5 (N ir R ankstyvojo stiprumo), klinties portlandcementis CEM II/A-LL 42,5 N, plastiklis Centrament N3, naujausios kartos superplastiklis MC-PowerFlow 3140 ir vanduo. Ištirtas plastiklio ir superplastiklio poveikis vandens ir cemento (V/C) santykio pokyčiams ir portlandcemenčio tešlų sklidumui naudojant Sutardo viskozimetrą. Buvo tiriamos vienodo vandens ir cemento santykio portlandcemenčio tešlos su cheminėmis įmaišomis ir be jų. Tyrimai atlikti naudojant rotacinį viskozimetrą Rheotest NH 4.1 su bendraašiais cilindrais. Nustatytas cheminių įmaišų portlandcemenčio tešlose veiksmingumas. Pastebėta, kad portlandcemenčio tešlų dinaminė klampa gali būti reguliuojama cheminėmis įmaišomis viso indukcinio hidratacijos periodo metu. Atlikus portlandcemenčio tešlų su cheminėmis įmaišomis ir be jų tyrimų rezultatų regresinę analizę, gautos empirinės lygtys.

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17

Gerasimova, Ekaterina S., and Elizaveta Gumirova. "Influence of “MC-Bauchemie” Additions on the Fine-Grained Concrete Properties." Solid State Phenomena 309 (August 2020): 114–19. http://dx.doi.org/10.4028/www.scientific.net/ssp.309.114.

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The paper is devoted to research of influence of “MC-Bauchemie” additions on the fine-grained concrete properties, namely compressive strength. The results of testing of fine-grained concrete made on the basis of two different natural sands are presented. Characteristics of the initial materials used in the work (Portland cement, sands and additions-plasticizers) are given. The basic methods of preparation of mixes and testing of hardened cement stone and concrete are described. The optimal quantity of the selected additions on the example of cement paste and stone are established. Mobility dependences of concrete mixes on a type and quantity of plasticizers are received. The dependence of the additions effectiveness on the mobility of the concrete mix on the quality of the fine aggregate is shown. It is established that the most effective additive is PowerFlow 3100, its optimal amount for obtaining fine-grained concrete on the basis of JSC “Kar’er Myisyi” sand is 0.2 %.

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18

Strelkov, N. I. "The Role of Superand Hyper Plasticizing Agents in Forming of Hight-Perfomance Concretes." Intellekt. Sist. Proizv. 16, no. 1 (April 2, 2018): 83. http://dx.doi.org/10.22213/2410-9304-2018-1-83-91.

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В настоящей статье рассматривается эффективность действия супер- и гиперпластификаторов в составах мелкозернистых песчаных бетонов. Оценивалась роль действия отечественных и зарубежных марок супер- и гиперпластификаторов в формировании прочности бетона на основе комплексного сравнительного анализа. В комплексе рассматривались показатели свойств, достигаемые мелкозернистыми песчаными бетонными смесями, которые содержали минимальное количество пластификатора и одновременно имели максимальную подвижность (которая оценивалась по диаметру расплыва стандартного конуса Абрамса). Во внимание принималась достигаемая прочность бетонов при твердении смесей в воздушно-влажных условиях. Ввиду того, что прочность бетона существенно зависит от вида, генезиса и физико-механических свойств заполнителя, целесообразно было исследовать влияние модуля крупности песка на подвижность, прочность и однородность мелкозернистого песчаного бетона, содержащих супер- и гиперпластификаторы. На основе экспериментальных исследований установлено, что наилучшей способностью сохранять требуемую подвижность (П3 - 10-15 см) и максимально снижать количество воды затворения обладает порошковый суперпластификатор Melflux 1641F на поликарбоксилатной основе. Кроме того, мелкозернистые песчаные бетоны обладали лучшей однородностью по сравнению с бетонами, содержащими пластифицирующие добавки Реламикс и МС-PowerFlow 2290. Повышение прочности при сравнении показателей мелкозернистых песчаных бетонов достигается при использовании модуля крупности песка М к = 1,25. Бетонные смеси с его использованием обладали однородностью и не расслаивались.

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Wang, Song, Rayane Ait Oubahou, Zixin He, Anthony Mickalauskas, David Menicovich, and Luc Mongeau. "Acoustical analysis of sound generated by synthetic jet actuators." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 2 (August 1, 2021): 4823–31. http://dx.doi.org/10.3397/in-2021-2851.

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Piezoelectrically driven synthetic jet actuators (SJA) are useful in various applications such as flow control, heat transfer and camera lens cleaning. This paper aims to better understand the fundamental sound generation mechanisms of synthetic jet actuators and investigate methods for the noise reduction and vibration control. The SJAs tested in this paper are driven by sinusoidal signals at frequencies ranging between 100 and 600 Hz, and can produce pulsated air jets at high velocity, up to 100 m/s. The sound generated by these devices, generally tonal and rich in harmonics, was modeled as the superposition of two monopoles associated with the breathing mode of the diaphragm and of the pulsated jet. Component analyses showed that the two monopoles cancelled each other partially depending on their amplitudes and phase relationship. A computational aeroacoustic model of the SJAs was built using PowerFLOW, a computation fluid dynamic simulation software. Simulation results were compared with jet velocities measured with a hot-wire anemometer and flow patterns were analyzed. Active and passive control methods were investigated, and a sound quality analysis was performed in order to reduce the overall radiated sound power and improve sound quality.

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20

Marovic, Danijela, Matej Par, Ana Crnadak, Andjelina Sekelja, Visnja Negovetic Mandic, Ozren Gamulin, Mario Rakić, and Zrinka Tarle. "Rapid 3 s Curing: What Happens in Deep Layers of New Bulk-Fill Composites?" Materials 14, no. 3 (January 21, 2021): 515. http://dx.doi.org/10.3390/ma14030515.

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This study assessed the influence of rapid 3 s light curing on the new generation of bulk-fill resin composites under the simulated aging challenge and depths up to 4 mm. Four bulk-fill materials were tested: two materials designed for rapid curing (Tetric PowerFill—PFILL; Tetric PowerFlow—PFLW) and two regular materials (Filtek One Bulk Fill Restorative—FIL; SDR Plus Bulk Fill Flowable—SDR). Three-point bending (n = 10) was used to measure flexural strength (FS) and flexural modulus (FM). In the 3 s group, two 2 mm thick specimens were stacked to obtain 4 mm thickness, while 2 mm-thick specimens were used for ISO group. Specimens were aged for 1, 30, or 30 + 3 days in ethanol. The degree of conversion (DC) up to 4 mm was measured by Raman spectroscopy. There was no difference between curing protocols in FS after 1 day for all materials except PFLW. FM was higher for all materials for ISO curing protocol. Mechanical properties deteriorated by increasing depth (2–4 mm) and aging. ISO curing induced higher DC for PFLW and FIL, while 3 s curing was sufficient for PFILL and SDR. The 3 s curing negatively affected FM of all tested materials, whereas its influence on FS and DC was highly material-specific.

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21

Inalpolat, Murat, Enes Timur Ozdemir, Bahadir Sarikaya, and Hyun Ku Lee. "A multibody dynamic model for predicting operational load spectra of dual clutch transmissions." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 2 (August 1, 2021): 4132–43. http://dx.doi.org/10.3397/in-2021-2609.

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In this paper, a generalized nonlinear time-varying multibody dynamic model of dual clutch transmissions (DCT) is presented. The model consists of clutches, shafts, gears and synchronizers, and can be used to model any DCT architecture. A nonlinear clutch model is used to determine the transmitted power to the transmission at any speed and clutch temperature. The clutch can be a single- or multi-plate clutch and can operate in a wet or dry-clutch configuration. A combined kinematic and powerflow simulation enables calculation of gear, shaft, bearing and clutch quasi-static loads as well as gear mesh frequencies following a duty cycle as the input. For the corresponding Linear-Time-Invariant (LTI) system model, natural frequencies and mode shapes are obtained by solving the eigenvalue problem. The modal summation technique is used to determine the steady state forced vibration response of the system. For the corresponding NTV system, Newmark's time-step marching based integration is used to determine both the steady state and transient forced vibration response of the system. The DCT model is exercised using a common transmission architecture operating at several different operating conditions. The resulting impact of changing operational conditions on gear and bearing loads as well as dynamic transmission error spectra are demonstrated.

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22

Schäfer, Rebecca, and Martin Böhle. "Validation of the Lattice Boltzmann Method for Simulation of Aerodynamics and Aeroacoustics in a Centrifugal Fan." Acoustics 2, no. 4 (September 26, 2020): 735–52. http://dx.doi.org/10.3390/acoustics2040040.

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Due to the fact that legal and market requirements are becoming stricter, fan noise reduction, in addition to energy efficiency, represent a challenge for fan product designers. Most experimental studies are associated with trial-and-error approaches. Therefore, numerical methods are mostly preferable. However, the quantitative prediction of the noise emitted by radial fans via numerical simulations remains challenging. The Lattice Boltzmann method (LBM) is a relatively new approach that promises a direct calculation of the aerodynamics coupled with the aeroacoustics. This article presents an LBM simulation of a centrifugal fan using the commercial Lattice Boltzmann Code SIMULIA PowerFLOW of Dassault Systèmes. The simulation model includes both the fan impeller and the spiral housing. In accordance with the experimental setup, the fan was mounted in a test bench to analyze four different operating points. The results of the LBM simulation were validated by experimental measurements. Flow information in terms of pressure rise and efficiency of the centrifugal fan as a function of the flow rate are in a good agreement. Considering the acoustic spectra and the blade passing frequency, the simulation was able to precisely predict the noise of the centrifugal fan. The simulation results are also used to visualize the flow and acoustic field inside of the fan to detect noise-generating flow features. By evaluating the filtered pressure fluctuation in the fluid volume and on the wall, four main noise sources of the centrifugal fan can be identified.

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23

Moskalenko, A. A. "RESEARCH OF THE INFLUENCE OF THE ORGANO-MINERAL COMPLEX OF BAUCHEMI ON THE PHYSICO-MECHANICAL PROPERTIES OF SLAG-CONTAINING CEMENT." Bulletin of Odessa State Academy of Civil Engineering and Architecture, no. 80 (September 3, 2020): 75–83. http://dx.doi.org/10.31650/2415-377x-2020-80-75-83.

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Abstract. The influence of the Bauhemi organo-mineral complex on the physical and mechanical properties of slag-containing Portland cements has been investigated. The composition of the organo-mineral complex has been optimized according to the criteria of setting time and strength. It has been shown that the expansion of the beginning of setting and its end is positively influenced by the presence of the plasticizer MC-PowerFlow2695 from 0.4 to 0.8% and the organo-mineral complex CentrilitNC and CentrilitFumeSX in the amount from 3 to 6.5%, which with a simultaneous increase in the slag content from 0 to 30% in the composition of Portland cement, the start / end time of setting increases from 150/190 to 185/250 minutes. It is noted that at the age of 7 days, the introduction of an organomineral complex of the composition MC-PowerFlow2695 from 0.2 to 3.5%, CentrilitNC from 4.5 to 7% and CentrilitFumeSX from 3 to 6.5% contributes to a slight decrease in strength from 3.86/13.95% with a simultaneous increase in the slag content in the composition of Portland cement in the amount of 10 and 30% compared with no additive Portland cement. At the grade age, at the noted concentrations of the Bauhemi organo-mineral complex, the strength of Portland cement with 10% slag increases by 5.4%, and with a slag content of 30%, it decreases by 9.73% compared with no additive Portland cement. Using the method of superposition of response functions, the optimal range of permissible concentrations of the components of the Bauhemi organo-mineral complex, affecting the stated criteria, was determined when the slag content in Portland cement was 10 and 30%, namely: MC-PowerFlow 2695 from 0.28 to 0.5%, CentrilitNC from 4 to 6.8% and CentrilitFumeSX from 3.07 to 6.61%. Further research will be aimed at studying the effect of this complex on the physical and mechanical properties with a slag content of 50 and 70% in the composition of Portland cement.

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24

FitzSimons, Jim. "Powerflex v data access corporation (reverse engineers beware!)." Computer Law & Security Review 14, no. 1 (January 1998): 45–47. http://dx.doi.org/10.1016/s0267-3649(97)88078-8.

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25

Wang, Maggie Haitian, Rui Sun, Junfeng Guo, Haoyi Weng, Jack Lee, Inchi Hu, Pak Chung Sham, and Benny Chung-Ying Zee. "A fast and powerfulW-test for pairwise epistasis testing." Nucleic Acids Research 44, no. 12 (April 25, 2016): e115-e115. http://dx.doi.org/10.1093/nar/gkw347.

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Johnson, Kameka L., Desen Zheng, Supaporn Kaewnum, Cheryl Lynn Reid, and Thomas Burr. "Development of a Magnetic Capture Hybridization Real-Time PCR Assay for Detection of Tumorigenic Agrobacterium vitis in Grapevines." Phytopathology® 103, no. 6 (June 2013): 633–40. http://dx.doi.org/10.1094/phyto-10-12-0267-r.

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Agrobacterium vitis, the causal agent of grape crown gall, can have severe economic effects on grape production. The bacterium survives systemically in vines and, therefore, is disseminated in propagation material. We developed an assay for use in indexing programs that is efficient and sensitive for detecting A. vitis in grape tissue. Initially, real-time polymerase chain reaction (PCR) primers specific for diverse tumorigenic strains of A. vitis were developed using the virD2 gene sequence. To overcome the effects of PCR inhibitors present in plant tissue, DNA extraction methods that included magnetic capture hybridization (MCH), immunomagnetic separation (IMS), and extraction with the Mo Bio Powerfood kit were compared. The assays incorporating MCH or IMS followed by real-time PCR were 10,000-fold more sensitive than direct real-time PCR when tested using boiled bacterial cell suspensions, with detection thresholds of 101 CFU/ml compared with 105 CFU/ml. DNA extraction with the Powerfood DNA extraction kit was 10-fold more sensitive than direct real-time PCR, with a detection threshold of 104 CFU/ml. All three assays were able to detect A. vitis in healthy-appearing grapevine cuttings taken from infected vines.

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27

Allen, John G., Martin F. Hentemann, and Samuel J. Danishefsky. "A Powerfulo-Quinone Dimethide Strategy for Intermolecular Diels−Alder Cycloadditions." Journal of the American Chemical Society 122, no. 4 (February 2000): 571–75. http://dx.doi.org/10.1021/ja993627u.

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28

Entrala, C., J. C. Alvarez, E. Martinez-Espin, F. Fernandez-Rosado, J. A. Lorente, M. Lorente, and E. Villanueva. "Spanish population data for the 15 STRs loci included in Powerflex-16." International Congress Series 1239 (January 2003): 245–46. http://dx.doi.org/10.1016/s0531-5131(02)00821-x.

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29

Mendell, Gregory, and Karl Wette. "Using generalized PowerFlux methods to estimate the parameters of periodic gravitational waves." Classical and Quantum Gravity 25, no. 11 (May 15, 2008): 114044. http://dx.doi.org/10.1088/0264-9381/25/11/114044.

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30

Lakshmi, K., K. Kumaresan, C. Sridhar, and K. Shylesh. "Speed control of three phase induction motors using PowerFlex 525 compact AC drive." IOP Conference Series: Materials Science and Engineering 764 (March 7, 2020): 012038. http://dx.doi.org/10.1088/1757-899x/764/1/012038.

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31

Ritter, Meyer, Koch, Haller, Bauknecht, and Heinemann. "Effects of a Delayed Expansion of Interconnector Capacities in a High RES-E European Electricity System." Energies 12, no. 16 (August 12, 2019): 3098. http://dx.doi.org/10.3390/en12163098.

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In order to achieve a high renewable share in the electricity system, a significant expansion of cross-border exchange capacities is planned. Historically, the actual expansion of interconnector capacities has significantly lagged behind the planned expansion. This study examines the impact that such continued delays would have when compared to a strong interconnector expansion in an ambitious energy transition scenario. For this purpose, scenarios for the years 2030, 2040, and 2050 are examined using the electricity market model PowerFlex EU. The analysis reveals that both CO2 emissions and variable costs of electricity generation increase if interconnector expansion is delayed. This effect is most significant in the scenario year 2050, where lower connectivity leads roughly to a doubling of both CO2 emissions and variable costs of electricity generation. This increase results from a lower level of European electricity trading, a curtailment of electricity from a renewable energy source (RES-E), and a corresponding higher level of conventional electricity generation. Most notably, in Southern and Central Europe, less interconnection leads to higher use of natural gas power plants since less renewable electricity from Northern Europe can be integrated into the European grid.

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Grace, Sheryl, Ignacio Gonzalez-Martino, and Damiano Casalino. "Analysis of fan-stage gap-flow data to inform simulation of fan broadband noise." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 377, no. 2159 (October 14, 2019): 20190080. http://dx.doi.org/10.1098/rsta.2019.0080.

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Time-resolved simulations present a new opportunity for studying the disturbances responsible for the broadband interaction noise created by the fan stage. In this paper, two vane configurations from the source diagnostic test at the approach rotor speed were computed with PowerFLOW's very large-eddy simulation (VLES) method using two solution strategies: a coarser mesh near the rotor and a trip to trigger turbulent transition on the rotor; and a much finer mesh near the rotor with no trip. The simulated data allow for an investigation of the potential effect from the vane configuration and an in-depth study of the mean and turbulent flow in the interstage gap. A challenge related to post-processing of high-resolution simulations is discussed. Comparison of the flow quantities with previously obtained Reynolds Averaged Navier–Stokes simulation results indicates that little advantage is gained by running a lattice Boltmann method (LBM)/VLES to simply recover the gap flow parameters for use with a lower-order fan broadband interaction noise calculation method. The true benefit of the LBM/VLES is that the noise calculation can be directly and simultaneously completed with the flow simulation. This article is part of the theme issue ‘Frontiers of aeroacoustics research: theory, computation and experiment’.

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Beley, V. F., and G. V. Kotsar. "Assessment of wind energy potential ofthe Murmansk Regionand performance of Kola wind farm." Vestnik MGTU 23, no. 4 (December 30, 2020): 376–86. http://dx.doi.org/10.21443/1560-9278-2020-23-4-376-386.

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The paper gives an analysis of perspectives for development of wind power generation, information on the share of wind energy in electricity generation in the world and in Russian Federation is provided as well. Data on gross, technical, economic potential of wind energy of Russia and the Murmansk Region has been presented. When calculating the gross wind energy potential of the region, data from the last 10 years of observations carried out at 37 meteorological stations have been used. The territory of the region has been divided into 6 distinctive zones, based on the wind activity. Gross energy potential has been calculated for each zone: for the heights of 10, 50, 100, and 150 m. Gross wind energy potential of the region at the height of 150 m has thus been estimated at 23,090 billion kWh. The Murmansk Region's 201 MW Kola wind farm, which consists of 57 Siemens Gamesa SG 3.4-132 wind turbines with a unit capacity of 3.465 MW, is to be constructed by 2021 under the direction of Enel Green Power. Wind energy potential and annual power generation of the Kola wind farm have been assessed. The difference between the obtained results and calculations of Enel Group's specialists amounts to less than 15 %. For the cases of relocation of Kola wind farm to different wind zones, the annual power generation of the wind farm has been estimated. It has been determined, that in case of Kola wind farm's relocation to the zone with the highest wind activity its annual electricity generation could be increased up to 1.5 times. A model of the Kola energy system has been developed in NEPLAN software, its validity has been proven. The calculations of the wind farm's operation modes show that voltage levels of the system nodes and powerflows are within the boundaries defined by normative documents. The effectiveness of reactive power regulation of the wind farm has been shown.

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Siebert, Annemarie, Katharina Hofmann, Lena Staib, Etienne V. Doll, Siegfried Scherer, and Mareike Wenning. "Amplicon-sequencing of raw milk microbiota: impact of DNA extraction and library-PCR." Applied Microbiology and Biotechnology 105, no. 11 (June 2021): 4761–73. http://dx.doi.org/10.1007/s00253-021-11353-4.

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Abstract The highly complex raw milk matrix challenges the sample preparation for amplicon-sequencing due to low bacterial counts and high amounts of eukaryotic DNA originating from the cow. In this study, we optimized the extraction of bacterial DNA from raw milk for microbiome analysis and evaluated the impact of cycle numbers in the library-PCR. The selective lysis of eukaryotic cells by proteinase K and digestion of released DNA before bacterial lysis resulted in a high reduction of mostly eukaryotic DNA and increased the proportion of bacterial DNA. Comparative microbiome analysis showed that a combined enzymatic and mechanical lysis procedure using the DNeasy® PowerFood® Microbial Kit with a modified protocol was best suitable to achieve high DNA quantities after library-PCR and broad coverage of detected bacterial biodiversity. Increasing cycle numbers during library-PCR systematically altered results for species and beta-diversity with a tendency to overrepresentation or underrepresentation of particular taxa. To limit PCR bias, high cycle numbers should thus be avoided. An optimized DNA extraction yielding sufficient bacterial DNA and enabling higher PCR efficiency is fundamental for successful library preparation. We suggest that a protocol using ethylenediaminetetraacetic acid (EDTA) to resolve casein micelles, selective lysis of somatic cells, extraction of bacterial DNA with a combination of mechanical and enzymatic lysis, and restriction of PCR cycles for analysis of raw milk microbiomes is optimal even for samples with low bacterial numbers. Key points • Sample preparation for high-throughput 16S rRNA gene sequencing of raw milk microbiota. • Reduction of eukaryotic DNA by enzymatic digestion. • Shift of detected microbiome caused by high cycle numbers in library-PCR.

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Maxfield, L., S. G. Djorgovski, D. Thompson, M. A. Pahre, R. R. de Carvalho, M. Vigotti, and G. Grueff. "Optical and IR Properties of Radio Galaxies as a Function of their Radio Power." Symposium - International Astronomical Union 171 (1996): 414. http://dx.doi.org/10.1017/s0074180900233330.

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We compare optical and infrared photometric and spectroscopic properties of high-redshift radio galaxies from the 3CR and B3 surveys. At a given redshift and a fixed restframe frequency, the two samples differ on average by an order of magnitude in radio power, thus providing a fair baseline in radio powerfor a range of redshifts. We present new optical and IR photometry and spectrosopy for a number of B3 sources. We combine these data with the existing corresponding information on B3 and 3CR sources, in order to explore different correlations of source properties with redshift, and among themselves. B3 sources follow the same trend as 3CR's in the K band Hubble diagram, although they do seem to be slightly fainter on average at a given redshift. This trend is slightly more prominent in the Gunn r band. This suggests that some fraction of the observed light in the r and K bands is contributed by an active nucleus, which also powers the radio lobes. The B3's also tend to have lower emission line luminosities than 3CR's at any given redshift, suggesting that there may be a correlation between line luminosity and radio power. Such a correlation is clearly seen and is followed by both samples. It suggests that the UV emission lines are largely powered by the active nucleus, ostensibly a hidden quasar, which is also responsible for the radio emission. We also examine the behavior of the optical and radio PA alignments for the combined B3+3CR data set. We find that high-power and high-redshift subsamples for both B3's and 3CR's show the alignments more prominently, but we still cannot tell which of these variables dominates this effect. This work was supported in part by the NSF PYI award AST-9157412, and the Bressler Foundation.

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Baier, Fabian, Edith Gruber, Thomas Hein, Elisabeth Bondar-Kunze, Marina Ivanković, Axel Mentler, Carsten A. Brühl, Bernhard Spangl, and Johann G. Zaller. "Non-target effects of a glyphosate-based herbicide on Common toad larvae (Bufo bufo, Amphibia) and associated algae are altered by temperature." PeerJ 4 (November 1, 2016): e2641. http://dx.doi.org/10.7717/peerj.2641.

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BackgroundGlyphosate-based herbicides are the most widely used pesticides in agriculture, horticulture, municipalities and private gardens that can potentially contaminate nearby water bodies inhabited by amphibians and algae. Moreover, the development and diversity of these aquatic organisms could also be affected by human-induced climate change that might lead to more periods with extreme temperatures. However, to what extent non-target effects of these herbicides on amphibians or algae are altered by varying temperature is not well known.MethodsWe studied effects of five concentrations of the glyphosate-based herbicide formulation Roundup PowerFlex (0, 1.5, 3, 4 mg acid equivalent glyphosate L−1as a one time addition and a pulse treatment of totally 4 mg a.e. glyphosate L−1) on larval development of Common toads (Bufo bufo, L.; Amphibia: Anura) and associated algae communities under two temperature regimes (15 vs. 20 °C).ResultsHerbicide contamination reduced tail growth (−8%), induced the occurrence of tail deformations (i.e. lacerated or crooked tails) and reduced algae diversity (−6%). Higher water temperature increased tadpole growth (tail and body length (tl/bl) +66%, length-to-width ratio +4%) and decreased algae diversity (−21%). No clear relation between herbicide concentrations and tadpole growth or algae density or diversity was observed. Interactive effects of herbicides and temperature affected growth parameters, tail deformation and tadpole mortality indicating that the herbicide effects are temperature-dependent. Remarkably, herbicide-temperature interactions resulted in deformed tails in 34% of all herbicide treated tadpoles at 15 °C whereas no tail deformations were observed for the herbicide-free control at 15 °C or any tadpole at 20 °C; herbicide-induced mortality was higher at 15 °C but lower at 20 °C.DiscussionThese herbicide- and temperature-induced changes may have decided effects on ecological interactions in freshwater ecosystems. Although no clear dose-response effect was seen, the presence of glyphosate was decisive for an effect, suggesting that the lowest observed effect concentration (LOEC) in our study was 1.5 mg a.e. glyphosate L−1water. Overall, our findings also question the relevance of pesticide risk assessments conducted at standard temperatures.

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Chiusolo, Patrizia, Sabrina Giammarco, Teresa Lamparelli, Lucia Casarino, Monica Rossi, Alida Dominietto, Anna Maria Raiola, et al. "Full Donor Chimerism after Allografts for Myelofibrosis: The Role of Conditioning Regimen." Blood 134, Supplement_1 (November 13, 2019): 4490. http://dx.doi.org/10.1182/blood-2019-126711.

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Background : The conditioning regimen for patients with myelolfibrosis undergoing an allogeneic HSCT is usually composed of a combination of fludarabine (FLU) with one alkylating agent, busulkfan (BU), thiotepa (THIO) or melphalan. In a recent prospective randomized study comparing BU-FLU versus THIO-FLU, the proportion of patients with full donor chimerism at 6 months, was respectively 63% and 65% (Patriarca et al, BBMT 2019). Aim of the study. Assess the rate of full donor chimerism in patients with myelofibrosis, after conditioning with one or two alkylating agents. Methods. We analyzed 113 patients with myelofibrosis, for whom chimerism data were available on day +30 . There were two groups: 35 patients were conditioned with either thiotepa-cyclophosphamide , thiotepa-fludarabine or busulfan-fludarabine (ONE-ALK), whereas 78 patients were prepared with thiotepa, busulfan, fludarabine (TBF). Patients receiving TBF were older (57 vs 52 years, p=0.008), were less frequently splenectomized pre-HSCT (30% vs 54%, p=0.03), had more frequently intermediate-2/high DIPSS scores (89% vs 74%, p=0.04) , and had comparable transfusion burden pre-HSCT (p=0.7). Chimerism was assessed via STR (PowerFlex-Promega) Results. The proportion of patients with full donor chimerism on day +30 in the TBF vs the ONE-ALK group was 87% vs 51% (p=0.00002); on day +60 these figures were 93% vs 13% (p<0.0001) and on day +90 , the figures were 90% vs 21% (p<0.00001). Full donor chimerism on day+30 was achieved in 81% of patients with DIPSS int1 (n=16), 74% of patients with int2 DIPSS, and 70% of patients with high risk DIPSS (p=0.6). Acute GvHD grade II-IV occurred in 27% vs 37% of patients in the two groups (p=0.7), and moderate severe chronic GvHD in 20% and 21% (p=0.8). The 5 year cumulative incidence of relapse was 8% in the TBF group, versus 50% for the ONE-ALK group (p<0.0001), whereas the CI of TRM was 25% vs 11% (p=0.1). The 5 year actuarial disease free survival (DFS) was respectively 65% for TBF and 38% for the ONE-ALK group (p=0.004). Complete chimerism day+30. When looking at whether patients had (n=84) or not (n=29) full donor chimerism on day +30, the CI of relapse was respectively 44% vs 15% (p=0.002), the CI of TRM 18% vs 15% (p=0.5), and the 5 year DFS 65% vs 32% (p=0.001). Conclusions. Early full donor chimerism is a prerequisite for long term control of disease in patients with myelofibrosis undergoing an allogeneic HSCT. The combination of 2 alkylating agents in the conditioning regimen, provides a significantly higher chance of achieving full donor chimerism on day+30, and thus long term disease control. Figure Disclosures Angelucci: Vertex Pharmaceuticals Incorporated, and CRISPR Therapeutics: Other: Partecipation in DMC; Roche: Other: Local advisory board; Jazz Pharmaceuticals: Other: Local advisory board; BlueBirdBio: Other: Local advisory board; Novartis: Honoraria, Other: Chair Steering Committee TELESTO protocol; Celgene: Honoraria, Other: Partecipation in DMC.

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"Aquas PowerFlow Tube Set." Biomedical Safety & Standards 50, no. 22 (December 15, 2020): 171. http://dx.doi.org/10.1097/01.bmsas.0000724964.19691.f0.

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"Nuvera begins sales of PowerFlow system." Fuel Cells Bulletin 2005, no. 6 (June 2005): 2. http://dx.doi.org/10.1016/s1464-2859(05)70636-2.

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Zavoloka, Michael, Elena Shinkevich, Varvara Vinnichenko, and Alexander Plit. "ENERGY-SAVING CHAMBER IN PRODUCTION OF BUILDING MATERIALS AND PRODUCTS." Journal of Engineering Science 28, no. 1 (April 2021). http://dx.doi.org/10.52326/jes.utm.2021.28(1).12.

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This paper presents the results of a study of the compressive strength of concrete in a cyclic solar chamber. The analysis of the existing types of industrial solar chambers is carried out and the main structural elements are considered. The method of calculating the solar chamber for the production of concrete products is presented. Experiments were carried out on heavy concrete compositions using MC-Bauchemie superplasticizers additives: MC-PowerFlow 3100 and MC-PowerFlow 2695. The samples were kept in a cyclical solar chamber. The strength of concrete was determined at different periods of concrete hardening. A comparative analysis of the results of the compressive strength of concrete in a solar and normal hardening chamber is carried out.

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Lee, Barry, and Enrique Pereira Batista. "Algebraic multigrid for the nonlinear powerflow equations." Numerical Linear Algebra with Applications, November 9, 2020. http://dx.doi.org/10.1002/nla.2347.

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Williams, Lance A., Christine Arnesen, Christina Gunn, Michael N. Boshell, Huy P. Pham, Bryan Guillory, Jill Adamski, and Marisa B. Marques. "New subcutaneous PowerFlow port results in cost and time‐savings in a busy outpatient apheresis clinic." Journal of Clinical Apheresis, December 12, 2018. http://dx.doi.org/10.1002/jca.21678.

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Winkler, Julian, Jeffrey M. Mendoza, C. Aaron Reimann, Kenji Homma, and Jose S. Alonso. "High fidelity modeling tools for engine liner design and screening of advanced concepts." International Journal of Aeroacoustics, August 24, 2021, 1475472X2110238. http://dx.doi.org/10.1177/1475472x211023884.

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With aircraft engines trending toward ultra-high bypass ratios, resulting in lower fan pressure ratios, lower fan RPM, and therefore lower blade pass frequency, the aircraft engine liner design space has been dramatically altered. This result is also due to the associated reduction in both the available acoustic treatment area (axial extent) as well as thickness (liner depth). As a consequence, there is current need for novel acoustic liner technologies that are able to meet multiple physical constraints and simultaneously provide enhanced noise attenuation capabilities. In addition, recent advances in additive manufacturing have enabled the consideration of complex liner backing structures that would traditionally be limited to honeycomb cores. This paper provides an overview of engine liner modeling and a description of the key physical mechanisms, with some emphasis on the use of low to high-fidelity tools such as empirical models and commercially available software such as COMSOL, Actran, and PowerFLOW. It is shown that the higher fidelity tools are a critical enabler for the evaluation and construction of future complex liner structures. A systematic study is conducted to predict the acoustic performance of traditional single degree of freedom liners and comparisons are made to experimental data. The effects of grazing flow and bias flow are briefly addressed. Finally, a more advanced structure, a metamaterial, is modeled and the acoustic performance is discussed.

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Maros, Antoine, Benoît Bonnal, Ignacio Gonzalez-Martino, James Kopriva, and Francesco Polidoro. "Corner Stall Prediction in a Compressor Linear Cascade Using Very Large Eddy Simulation Lattice-Boltzmann Method." Journal of Turbomachinery 142, no. 7 (June 30, 2020). http://dx.doi.org/10.1115/1.4047400.

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Abstract Compressor corner stall is a phenomenon difficult to predict with numerical tools but essential to the design of axial compressors. Predictive methods are beneficial early in the design process to understand design and off-design limitations. Prior numerical work using Navier–Stokes computational methods has assessed the prediction capability for corner stall. Reynolds-averaged Navier–Stokes (RANS) simulations using several turbulence models have shown to over-predict the region of corner hub stall where large eddy simulations (LES) and detached eddy simulations (DES) approaches improved the airfoil surface and wake pressure loss prediction. A linear compressor cascade designed and tested at Ecole Centrale de Lyon provides a good benchmark for the evaluation of the accuracy of numerical methods for corner stall. This paper presents results obtained with Lattice-Boltzmann method (LBM) coupled with very large-eddy simulations (VLES) approach of PowerFLOW and compares them with the experimental and numerical work from Ecole Centrale de Lyon. The ability to achieve equivalent accuracy at a lower computational cost compared to LES scale resolving methods can enable multi-stage design and off-design compressor predictions. A methodical approach is taken by first accurately simulating the upstream flow conditions. Geometric trips are modeled upstream on the endwalls to match both the mean and fluctuating inflow boundary layer conditions. These conditions were then applied to the simulation of the linear compressor cascade. The benchline experimental study includes trips on both the pressure and suction of the airfoil. These trips are also included for the current simulation. The significance of capturing both inflow conditions and including trips on the airfoil is assessed. Detailed comparisons are then made to airfoil loading and downstream losses between experiment and previous RANS and LES simulations. LBM-VLES corner stall results of pitchwise averaged total pressure match LES agreement relative to experimental data at 50 times lower computational cost.

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"Cordis Powerflex Dilatation Catheter." Biomedical Safety & Standards 49, no. 2 (February 2019): 15. http://dx.doi.org/10.1097/01.bmsas.0000552974.77442.4d.

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"Cordis Powerflex P3 Catheter." Biomedical Safety & Standards 50, no. 9 (May 2020): 69–70. http://dx.doi.org/10.1097/01.bmsas.0000662496.68306.d9.

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"A powerfl mechanism for change." Nursing Standard 26, no. 51 (August 22, 2012): 15. http://dx.doi.org/10.7748/ns.26.51.15.s23.

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"Data access corporation v powerflex, Bennett and ORS." Computer Law & Security Review 12, no. 5 (September 1996): 316–19. http://dx.doi.org/10.1016/0267-3649(96)82056-5.

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Antonello, Michele, Francesco Squizzato, and Michele Piazza. "The Viabahn balloon expandable stent for endovascular reconstruction of the infrarenal aorta and its bifurcation in cases of severe obstructive disease." Vascular, June 11, 2020, 170853812092784. http://dx.doi.org/10.1177/1708538120927847.

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Introduction The covered endovascular reconstruction of the aortic bifurcation (CERAB) represents a promising technique for the treatment obstructive lesions involving the aortic bifurcation. The aim of this report is to describe the use of a new generation balloon-expandable stent-graft (Viabahn VBX, W.L. Gore&Associates, AZ, USA), in the CERAB configuration for the treatment of aorto-iliac obstructive lesions involving the infrarenal aorta and bifurcation. Technical note: This technique was adopted in two patients with severe aorto-iliac obstructive lesions. After bilateral iliac recanalization, an 11 mm diameter VBX stent was deployed in the infrarenal aorta; a post-dilatation up to 16 mm with a non-compliant balloon was performed to adapt the proximal edge of the stent to the aortic diameter. Two 8 mm diameter VBX stents were then deployed at the aortic bifurcation in a kissing conformation, overlapping with the previously positioned aortic stent for 15 mm. A post-ballooning with two kissing 12 × 20 mm compliant balloons (Powerflex Pro PTA, Cordis, CA, USA) was performed to adapt the parallel stents to the aortic cuff. A post-operative angio-CT demonstrated optimal conformability of the aortic cuff to the aortic wall, and apposition of the kissing stents to the aortic cuff. Conclusions This preliminary experience shows that the VBX stent may allow an effective reconstruction of the aortic bifurcation; the conformability and flaring capability may allow to overcome the diameter mismatch between the aorta and the iliac arteries.

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Kozhakhmetov, Samat, Indira Tynybayeva, Dinara Baikhanova, Saule Saduakhasova, Gulnar Shakhabayeva, Almagul Kushugulova, Talgat Nurgozhin, and Zhaxybay Zhumadilov. "Metagenomic Analysis of Koumiss in Kazakhstan." Central Asian Journal of Global Health 3 (December 12, 2014). http://dx.doi.org/10.5195/cajgh.2014.163.

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Introduction. Koumiss is a low-alcohol product made from fermented mare's milk, which is popular in Kazakhstan, Russia, and other countries of Central Asia, China, and Mongolia. Natural mare's milk is fermented in symbiosis of two types of microorganisms (lactobacteria and yeast). Koumiss’s microbial composition varies depending on the geographical, climatic, and cultural conditions. Based on a phenotypic characteristic from samples, Wu, R. and colleagues identified the following bacteria isolated in inner Mongolia, an autonomous region of China: L.casei, L.helveticus, L.plantarum, L.coryniformis subsp. coryniformis, L.paracasei, L.kefiranofaciens, L.curvatus, L.fermentum, and W.kandleri. Studies of the yeast composition in koumiss also showed significant variations. Thus, there were Saccharomyces unisporus related 48.3% of isolates, to Kluyveromyces marxianus (27.6%), Pichia membranaefaciens (15.0%), and Saccharomyces cerevisiae (9.2%) from 87 isolated yeast cultures. The purpose of this study was to examine the bacterial composition in koumiss.Methods. To extract DNA, 1.8 ml of fermented milk was centrifuged to generate a pellet, which was suspended in 450 µl of lysis buffer P1 from the Powerfood Microbial DNA Isolation kit (MoBio Laboratories Inc, USA). Amplification of the microflora was used to determine the composition of a fragment of the gene 16S rRNA and ITS1. Plasmid library with target insertion was obtained on the basis of height copy plasmid vectors producing high pGem-T. The definition of direct nucleotide sequencing was performed by the method of Sanger using a set of "BigDye Terminanor v 3.1 Cycle sequencing Kit with automatic genetic analyzer ABI 3730xl (Applied Biosystems, USA). Informax Vector NTI Suite 9, Sequence Scanner v 1.0 software package used for the analysis.Results. Our studies showed that in the most samples of koumiss isolated from Akmola region (Central Kazakhstan) prevailed the following bacteria species: Lactobacillus diolivorans, Lactobacillus acidophilus, L. casei, L. curvatus yeast genus Torula (62.4%) and Saccharomyces cerevisiae (37.6%).Conclusion. Thus, the first metagenomic research of koumiss, which was conducted in Kazakhstan, showed significant variations in microbial composition.

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