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Добірка наукової літератури з теми "Acive Flux"

Автор: Grafiati
Опубліковано: 14 березня 2023

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Статті в журналах з теми "Acive Flux"

1

Wu, Xiao Na, Liang Wang, Zhao Hui Zhang, Wen Yang Li, and Xing Fei Guo. "Experimental Studies on CO2 Absorption in Immersed Hollow Fiber Membrane Contactor." Applied Mechanics and Materials 209-211 (October 2012): 1571–75. http://dx.doi.org/10.4028/www.scientific.net/amm.209-211.1571.

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Carbon dioxide (CO2) absorption performance from flue gas was investigated using monoethanolamine (MEA) solution in porous hydrophobic polyvinylidene fluoride (PVDF) hollow fiber membranes contactor. The influence of operating parameters on CO2 removal efficiency and flux were studied in the immersion operating mode. The experimental results indicated that the CO2 removal efficiency and flux decreased with the increase of flue gas load and carbonization degrees, but the increase of the absorbent concentration and temperature promoted membrane performance of CO2 capture. An increase of 84 m3•m-2•h-1 in the flue gas load resulted in a 68% decrease in the removal efficiency. Absorbent carbonation degree increased to 0.45 mol CO2•mol-1MEA led to the decrease of active ingredient amounts in the absorption solution, and the corresponding removal efficiency and membrane flux dropped by 50% of the initial amounts, respectively. The increase of concentration and temperature of absorbent also benefited membrane absorption performance of CO2 absorption, so that the concentration and temperature of the solvent increased lead to the CO2 removal efficiency and flux increased.
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Kudriavtseva, Anastasiia, Ivan Myshyakov, Arkadiy Uralov, and Victor Grechnev. "Microwave indicator of potential geoeffectiveness and magnetic flux-rope structure of a solar active region." Solar-Terrestrial Physics 7, no. 1 (March 29, 2021): 3–10. http://dx.doi.org/10.12737/stp-71202101.

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We analyze the presence of a microwave neutral-line-associated source (NLS) in a super-active region NOAA 12673, which produced a number of geo-effective events in September 2017. To estimate the NLS position, we use data from the Siberian Radioheliograph in a range 4–8 GHz and from the Nobeyama Radioheliograph at 17 GHz. Calculation of the coronal magnetic field in a non-linear force-free approximation has revealed an extended structure consisting of interconnected magnetic flux ropes, located practically along the entire length of the main polarity separation line of the photospheric magnetic field. NLS is projected into the region of the strongest horizontal magnetic field, where the main energy of this structure is concentrated. During each X-class flare, the active region lost magnetic helicity and became a CME source.
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Chandler, W. K., S. Hollingworth, and S. M. Baylor. "Simulation of Calcium Sparks in Cut Skeletal Muscle Fibers of the Frog." Journal of General Physiology 121, no. 4 (March 17, 2003): 311–24. http://dx.doi.org/10.1085/jgp.200308787.

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Spark mass, the volume integral of ΔF/F, was investigated theoretically and with simulations. These studies show that the amount of Ca2+ bound to fluo-3 is proportional to mass times the total concentration of fluo-3 ([fluo-3T]); the proportionality constant depends on resting Ca2+ concentration ([Ca2+]R). In the simulation of a Ca2+ spark in an intact frog fiber with [fluo-3T] = 100 μM, fluo-3 captures approximately one-fourth of the Ca2+ released from the sarcoplasmic reticulum (SR). Since mass in cut fibers is several times that in intact fibers, both with similar values of [fluo-3T] and [Ca2+]R, it seems likely that SR Ca2+ release is larger in cut fiber sparks or that fluo-3 is able to capture a larger fraction of the released Ca2+ in cut fibers, perhaps because of reduced intrinsic Ca2+ buffering. Computer simulations were used to identify these and other factors that may underlie the differences in mass and other properties of sparks in intact and cut fibers. Our spark model, which successfully simulates calcium sparks in intact fibers, was modified to reflect the conditions of cut fiber measurements. The results show that, if the protein Ca2+-buffering power of myoplasm is the same as that in intact fibers, the Ca2+ source flux underlying a spark in cut fibers is 5–10 times that in intact fibers. Smaller source fluxes are required for less buffer. In the extreme case in which Ca2+ binding to troponin is zero, the source flux needs to be 3–5 times that in intact fibers. An increased Ca2+ source flux could arise from an increase in Ca2+ flux through one ryanodine receptor (RYR) or an increase in the number of active RYRs per spark, or both. These results indicate that the gating of RYRs, or their apparent single channel Ca2+ flux, is different in frog cut fibers—and, perhaps, in other disrupted preparations—than in intact fibers.
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Kuzmina, T. О., M. B. Yedynovych, Yu V. Berezovsky, S. V. Bobyr, V. V. Yevtushenko, and I. A. Rudenko. "Application of Biologically Active Substances for Storage of Oil Flax Straw." Science and innovation 14, no. 4 (July 31, 2018): 25–37. http://dx.doi.org/10.15407/scine14.04.025.

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Bhattacharya, S., A. Veltman, D. M. Divan, and R. D. Lorenz. "Flux-based active filter controller." IEEE Transactions on Industry Applications 32, no. 3 (1996): 491–502. http://dx.doi.org/10.1109/28.502159.

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Liggett, Margaret, and Harold Zirin. "Emerging flux in active regions." Solar Physics 97, no. 1 (May 1985): 51–58. http://dx.doi.org/10.1007/bf00152978.

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Kubo, M., B. W. Lites, T. Shimizu, and K. Ichimoto. "Magnetic Flux Loss and Flux Transport in a Decaying Active Region." Astrophysical Journal 686, no. 2 (October 20, 2008): 1447–53. http://dx.doi.org/10.1086/592064.

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Dorner, Daniela, Axel Arbet-Engels, Dominik Baack, Matteo Balbo, Adrian Biland, Michael Blank, Thomas Bretz, et al. "Flux States of Active Galactic Nuclei." Galaxies 7, no. 2 (May 21, 2019): 57. http://dx.doi.org/10.3390/galaxies7020057.

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Blazars are known to show variability on time scales from minutes to years covering a wide range of flux states. Studying the flux distribution of a source allows for various insights. The shape of the flux distribution can provide information on the nature of the underlying variability processes. The level of a possible quiescent state can be derived from the main part of the distribution that can be described by a Gaussian distribution. Dividing the flux states into quiescent and active, the duty cycle of a source can be calculated. Finally, this allows alerting the multi-wavelength and multi-messenger community in case a source is in an active state. To get consistent and conclusive results from flux distributions, unbiased long-term observations are crucial. Only like this is a complete picture of the variability and flux states, e.g., an all-time quiescent state, possible. In seven years of monitoring of bright TeV blazars, the first G-APD Cherenkov telescope (FACT) has collected a total of more than 11,700 hours of physics data with 1500 hours to 3000 hours per source for Mrk 421, Mrk 501, 1ES 1959+650, and 1ES 2344+51.
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OKAZAKI, Tsukasa, and Tadashi OKANIWA. "Application of Active Flux TIG welding." Journal of the Japan Welding Society 71, no. 2 (2002): 100–103. http://dx.doi.org/10.2207/qjjws1943.71.100.

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Mujić, Emir, Halil Omanović, Javier Mateo, Nermin Pračić, Husein Vilić, Refik Šahinović, Drago Nedić, Francisco Javier Giráldez, Jose Manuel Lorenzo, and Matjaž Červek. "Effect of Flax-Seed Enriched Concentrate Supplementation in Grazing Pramenka Breed Lamb’s Diet on Omental Fat Fatty Acids." Acta Veterinaria 68, no. 4 (December 1, 2018): 502–11. http://dx.doi.org/10.2478/acve-2018-0040.

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Abstract This research is aimed at determining the impact of supplementing extensively reared lambs with a limited amount of flax seed enriched-concentrate on the fatty acid profile of the lamb meat (omental fat depot). A total of 96 60-day old Pramenka breed lambs (23.85±3.98 kg live body weight; 60±10 days of age; 42 males and 54 females) raised on pasture with their dams were randomly divided in three experimental groups: control (CON) or extensive rearing group, which did not receive any supplementary feed; concentrate (CC) group, receiving 300 g of a conventional commercial concentrate feed per animal daily, and concentrate-flax seed (CC-FS) group, receiving 300 g/day of the concentrate supplemented with 5% of flax seed. After 60 days of experimental period, 10 lambs were selected (5 males and 5 females) from each group and slaughtered. Omental fat samples were taken and analyzed to determine their fatty acid profile. Significant (P>0.05) differences in the fatty acid profile between CON and CC groups were small. However, enrichment of the concentrate with 5% flax seed increased the percentages of PUFA and n-3 PUFA when compared to both CON and CC groups and thus slightly improved the nutritional characteristics of the omental fat. The effect of sex on the fatty acid profile was only observed for C20:4 n-6 and C20:5 n-3 (P < 0.05).
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Дисертації з теми "Acive Flux"

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PESCETTO, PAOLO. "Sensorless Commissioning and Control of High Anisotropy Synchronous Motor Drives." Doctoral thesis, Politecnico di Torino, 2019. http://hdl.handle.net/11583/2730183.

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MacTaggart, David. "Theoretical magnetic flux emergence." Thesis, University of St Andrews, 2011. http://hdl.handle.net/10023/1692.

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Magnetic flux emergence is the subject of how magnetic fields from the solar interior can rise and expand into the atmosphere to produce active regions. It is the link that joins dynamics in the convection zone with dynamics in the atmosphere. In this thesis, we study many aspects of magnetic flux emergence through mathematical modelling and computer simulations. Our primary aim is to understand the key physical processes that lie behind emergence. The first chapter introduces flux emergence and the theoretical framework, magnetohydrodynamics (MHD), that describes it. In the second chapter, we discuss the numerical techniques used to solve the highly non-linear problems that arise from flux emergence. The third chapter summarizes the current literature. In the fourth chapter, we consider how changing the geometry and parameter values of the initial magnetic field can affect the dynamic evolution of the emerging magnetic field. For an initial toroidal magnetic field, it is found that its axis can emerge to the corona if the tube’s initial field strength is large enough. The fifth chapter describes how flux emergence models can produce large-scale solar eruptions. A 2.5D model of the breakout model, using only dynamic flux emergence, fails to produce any large scale eruptions. A 3D model of toroidal emergence with an overlying magnetic field does, however, produce multiple large-scale eruptions and the form of these is related to the breakout model. The sixth chapter is concerned with signatures of flux emergence and how to identify emerging twisted magnetic structures correctly. Here, a flux emergence model produces signatures found in observations. The signatures from the model, however, have different underlying physical mechanisms to the original interpretations of the observations. The thesis concludes with some final thoughts on current trends in theoretical magnetic flux emergence and possible future directions.
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Brandt, Lundqvist Olof. "Construction of an Active Rectifier for a Transverse-Flux Wave Power Generator." Thesis, KTH, Elkraftteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-215635.

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Wave power is an energy source which could make a decisive difference in thetransition towards a more sustainable energy sector. The growth of wave powerproduction has however not been as rapid as the growth in other renewableenergy fields, such as wind power and solar power. Some technical obstaclesremain before a major breakthrough for wave power can be expected. Oneobstacle so far has been the low voltages and the resulting high power lossesin many wave power plants. A new type of wave power generator, which hasbeen invented by Anders Hagnestål at KTH in Stockholm, aims to solve theseproblems. This master’s thesis deals with the power electronic converter systemfor Anders Hagnestål’s generator. It describes the planning and constructionprocess for a single-phase AC/DC converter, which will eventually be a partof the larger converter system for the generator. A control system based onhysteresis current control is planned and assembled. The finished single-phaseconverter shows agreeable results working as an inverter, generating a distinctlysinusoidal AC voltage. However, some additional construction and calibrationin the digital control system remain, before the converter can be used in thepower conversion for a wave power plant.
Vågkraft är en energikälla som skulle kunna göra en avgörande skillnad i omställningenmot en hållbar energisektor. Tillväxten för vågkraft har dock intevarit lika snabb som tillväxten för andra förnybara energislag, såsom vindkraftoch solkraft. Vissa tekniska hinder kvarstår innan ett stort genombrott för vågkraftkan bli möjligt. Ett hinder fram tills nu har varit de låga spänningarna ochde resulterande höga effektförlusterna i många vågkraftverk. En ny typ av vågkraftsgenerator,som har tagits fram av Anders Hagnestål vid KTH i Stockholm,avser att lösa dessa problem. I det här examensarbetet behandlas det effektelektroniskaomvandlingssystemet för Anders Hagneståls generator. Det beskriverplanerings- och konstruktionsprocessen för en enfasig AC/DC-omvandlare, somså småningom skall bli en del av det större omvandlingssystemet för generatorn.Ett kontrollsystem för omvandlaren, baserat på hystereskontroll för strömmen,planeras och sätts ihop. Den färdiga enfasomvandlaren visar goda resultat underdrift som växelriktare. Dock kvarstår visst konstruktionsarbete och viss kalibreringav det digitala kontrollsystemet innan omvandlaren kan användas för sinuppgift i effektomvandlingen hos vågkraftverket.
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Kwong, Lian Elizabeth. "A novel approach to estimate active carbon flux using the micronekton biomass spectra." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/59702.

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Micronekton play a critical role in global carbon cycling, actively transporting carbon between the surface and deep ocean during diel migrations. Carbon transport is mediated through respiration, gut flux, excretion and mortality of migrating organisms. Because marine ecological processes are strongly size dependent, it was proposed that active carbon transport can be measured from biomass spectra. The micronekton community was sampled during the Micronekton Intercalibration Experiment (MIE-1) in October of 2004 off the south west coast of Oahu. Sampling was conducted during both day and night in the epipelagic (0 – 120 m) and mesopelagic (550 – 650 m) layers, using three micronekton sampling gears (Cobb trawl, Isaacs-Kidd Midwater trawl, Hokkaido University Frame Trawl) and an acoustic echosounder (hull-mounted, dual-frequency, split-beam Simrad EK60). Micronekton species composition and size spectra varied depending on the depth and time of day. We estimated total migratory micronekton abundance and biomass to be ~487 ind.m-² and ~6,014 mgC m-², respectively, assuming that ~16% of micronekton remained within the epipelagic zone during the day. A biomass/production size dependent model based on the biomass spectra theory was developed to predict active carbon transport of micronekton. The model was robust against changes in respiration, excretion and mortality, but relatively sensitive to changes in the gut flux. The model estimated that vertically migrating micronekton exported approximately 88.5 mgC m-² day -¹ to ~450 m depth in this region. This estimate was substantially higher than the majority of past estimates, and comparable to recent total global carbon export estimates. The model output suggests that micronekton play a key role in active carbon cycling, and that their contribution to carbon cycling may have been underestimated. Therefore, behavioural and physiological responses of these organisms to changes in oceanic conditions may affect the efficiency and strength of the biological pump potentially reducing atmospheric CO₂ sink to the deep-ocean.
Science, Faculty of
Graduate
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5

Kail, Maximilian M. [Verfasser]. "Direct Flux Control for High-Power Active Front Ends with Low Switching Frequency / Maximilian M Kail." Aachen : Shaker, 2003. http://d-nb.info/1170544517/34.

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Romary, Raphaël. "Modélisation de la machine synchrone à concentration de flux : application à la réduction active des vibrations." Lille 1, 1995. http://www.theses.fr/1995LIL10031.

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Le travail présente traite de la modélisation de la machine synchrone à concentration de flux ainsi que de la réduction de certaines composantes de vibrations tangentielles. La première partie est consacrée à la modélisation de cette machine. Sa géométrie particulière, essentiellement liée à la présence d'aimants au rotor ne permet pas de considérer les schémas et les hypothèses classiques utilisés dans l'étude des machines électriques. Aussi, dans un premier temps, diverses considérations physiques concernant la répartition des lignes de champ dans le rotor permettent d'établir les expressions analytiques de la perméance par unité d'angle et de la force magnéto-motrice le long de l'entrefer. Ces expressions conduisent à définir les inductances statoriques de la machine où il est mis en évidence certaines propriétés propres à la machine à concentration de flux. Les diagrammes de fonctionnement sont ensuite établis en tenant compte des particularités de cette machine. Il est montré que sous certaines conditions, il est possible de considérer le diagramme à deux réactances de la machine synchrone classique. La seconde partie du travail concerne l'étude des harmoniques de couple et la réduction des vibrations. Il y est mis en évidence les différentes composantes harmoniques de couple en utilisant le formalisme du vecteur espace. Cela permet alors de proposer une stratégie de commande pour un onduleur de tension pilote en courant permettant d'éliminer certaines composantes harmoniques de couple. La procédure proposée est ensuite expérimentée. Il est vérifié qu'elle permet d'éliminer certaines composantes harmoniques de vibrations tangentielles causées par les harmoniques de couple de même rang.
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George, Tyrel Daniel Frank. "Design and testing of long-lifetime active sensor arrays for in-core multi-dimensional flux measurements." Thesis, Kansas State University, 2016. http://hdl.handle.net/2097/35229.

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Master of Science
Department of Mechanical and Nuclear Engineering
Douglas S. McGregor
Fission chambers are a common type of detector used to determine the neutron flux and power of a nuclear reactor. Due to the limited space and high neutron flux in a reactor core, it is difficult to perform real-time flux measurements with present-day in-core instrumentation. Micro-pocket fission detectors, or MPFDs, are relatively small in size and have low neutron sensitivity while retaining a large neutron to gamma ray discrimination ratio, thereby, allowing them to be used as active neutron flux monitors inside a nuclear reactor core. The micro-pocket fission chamber allows for multiple detectors to be inserted into a flux port or other available openings within the nuclear reactor core. Any material used to construct the MPFD must be rugged and capable of sustaining radiation damage for long periods of time. Each calibrated MPFD provides measurements of the flux for a discrete location. The size of these detectors allows for a spatial map of the flux to be developed, enabling real-time analysis of core burnup, power peaking, and rod shadowing. Small diameter thermocouples can be included with the array to also measure the temperature at each location. The following document details the research and development of MPFDs for long term use in nuclear power reactors. Previous MPFD designs were improved, miniaturized, and optimized for long term operations in reactor test ports designed for passive measurements of fluence using iron wires. Detector chambers with dimensions of 0.08 in x 0.06 in x 0.04 in were attached to a common cathode and individual anodes to construct an array of the MPFDs. Each array was tested at the Kansas State University TRIGA Mark II nuclear reactor to demonstrate functionality. The linear response in reactor power was measured. These arrays have also demonstrated reactor power tracking by following reactivity changes in steady state operations and reactor pulsing events. Stability testing showed consistent operation at 100 kW for several hours. The MPFDs have been demonstrated to be a viable technology for in-core measurements.
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Wilson, Brian Christopher David. "Control Designs for Low-Loss Active Magnetic Bearing: Theory and Implementation." Diss., Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-04122004-133631/unrestricted/wilson%5Fbrian%5Fc%5F200405%5Fphd.pdf.

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Анотація:
Thesis (Ph. D.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2004.
Habetler, Thomas, Committee Member ; Sadegh Nader, Committee Member ; Taylor David, Committee Member ; Tsiotras Panagiotis, Committee Co-Chair ; Heck-Ferri Bonnie, Committee Co-Chair. Vita. Includes bibliographical references (leaves 319-326).
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Ishii, Takako. "Relation between Emergence of Twisted Magnetic Flux Bundle and Flare Activities in Active Regions on the Sun." 京都大学 (Kyoto University), 2000. http://hdl.handle.net/2433/181118.

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Takasao, Shinsuke. "Fundamental Magnetohydrodynamic Processes of Solar Flares: Formation of Flare-productive Regions and Evolution of Flare Loops." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215316.

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Книги з теми "Acive Flux"

1

Paul, Kolodziej, and United States. National Aeronautics and Space Administration., eds. Dual active surface heat flux gage probe. [Washington, DC]: National Aeronautics and Space Administration, 1995.

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2

Paul, Kolodziej, and United States. National Aeronautics and Space Administration., eds. Dual active surface heat flux gage probe. [Washington, DC]: National Aeronautics and Space Administration, 1995.

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3

United States. National Aeronautics and Space Administration., ed. Microwave spectroscopy of the active sun: Final technical report. [Washington, DC: National Aeronautics and Space Administration, 1992.

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4

H, Sharaf El-Din Hazem, Liu C. H. 1941-, and United States. National Aeronautics and Space Administration., eds. Three dimensional solution of pneumatic active control of forebody vortex asymmetry. Washington, D.C: American Institute of Aeronautics and Astronautics, 1995.

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5

United States. National Aeronautics and Space Administration., ed. Effective control of computationally simulated wing rock in subsonic flow. [Washington, DC: National Aeronautics and Space Administration, 1997.

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6

Frazer, G. W. A method for estimating canopy openness, effective leaf area index, and photosynthetically active photon flux density using hemispherical photography and computerized image analysis techniques. Victoria, B.C: Pacific Forestry Centre, 1997.

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7

K, Poon W. C., Andelman D. 1955-, and Scottish Universities Summer School in Physics (59th : 2004 : Edinburgh, Scotland), eds. Soft condensed matter physics in molecular and cell biology. New York: Taylor & Francis, 2006.

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8

Strous, Louis. Dynamics in Solar Active Regions: Patterns in Magnetic-flux Emergence. Utrecht, 1994.

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9

On the relationship between transit velocity of interplanetary shocks and solar active processes. [Washington, D.C: National Aeronautics and Space Administration, 1996.

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10

Active minimization of energy density in three-dimensional enclosures: Performance report Dec. 1993-Dec. 1994. State College, PA: Pennsylvania State University, Applied Research Laboratory, 1994.

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Частини книг з теми "Acive Flux"

1

Koo, D. C., R. G. Kron, and R. A. Windhorst. "Optical Spectra of Low Flux Radio Sources." In Active Galactic Nuclei, 518–19. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0963-2_161.

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2

Ryutova, Margarita. "Electrodynamic Coupling of Active Region Corona with the Photosphere." In Physics of Magnetic Flux Tubes, 425–64. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-96361-7_16.

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3

Ryutova, Margarita. "Electrodynamic Coupling of Active Region Corona with the Photosphere." In Physics of Magnetic Flux Tubes, 395–432. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-45243-1_16.

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4

Mittaz, J. P. D., and G. Branduardi-Raymont. "The Flux and Spectral Variability of NGC6814 as Observed with EXOSAT." In Active Galactic Nuclei, 179–81. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0963-2_51.

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Esendemir, Akif, and Ümit Kiziloğlu. "Low Flux Line Profiles on the IUE Spectra of II Peg." In Active Close Binaries, 579–89. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0679-2_44.

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Branduardi-Raymont, G. "EXOSAT Observations of Flux and Spectral Variability in the Seyfert Galaxy NGC5548." In Active Galactic Nuclei, 177–78. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0963-2_50.

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Hartsell, T. P., and P. L. Bornmann. "Active Region Evolution and Solar Flux Variations." In The Sun as a Variable Star: Solar and Stellar Irradiance Variations, 189–94. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0950-5_29.

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Grigoryev, V. M., and V. L. Selivanov. "Diagnosing the fine structure of magnetic fields in the photospheric network on the periphery of active regions." In Physics of Magnetic Flux Ropes, 153–56. Washington, D. C.: American Geophysical Union, 1990. http://dx.doi.org/10.1029/gm058p0153.

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Spinoglio, L., and M. A. Malkan. "A 12µm Flux Limited Sample of Galaxies: Preliminary Results on the IR Luminosity Function." In Active Galactic Nuclei, 55–56. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0963-2_13.

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Giménez, Alvaro, and Constanze La Dous. "The EUV Flux of Chromospherically Active Binary Stars." In Astrophysics in the Extreme Ultraviolet, 181–82. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-011-3988-5_29.

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Тези доповідей конференцій з теми "Acive Flux"

1

Eymann, Timothy, and Philip Roe. "Active Flux Schemes." In 49th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2011. http://dx.doi.org/10.2514/6.2011-382.

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Eymann, Timothy A., and Philip L. Roe. "Multidimensional Active Flux Schemes." In 21st AIAA Computational Fluid Dynamics Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2013. http://dx.doi.org/10.2514/6.2013-2940.

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Nishikawa, Hiroaki, Philip L. Roe, and Timothy A. Eymann. "Active Flux for Diffusion." In 7th AIAA Theoretical Fluid Mechanics Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2014. http://dx.doi.org/10.2514/6.2014-2092.

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Nishikawa, Hiroaki. "Active Flux for Advection Diffusion." In 22nd AIAA Computational Fluid Dynamics Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2015. http://dx.doi.org/10.2514/6.2015-2450.

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Eymann, Timothy, and Philip Roe. "Active Flux Schemes for Systems." In 20th AIAA Computational Fluid Dynamics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2011. http://dx.doi.org/10.2514/6.2011-3840.

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Hredzak, B., and G. Guo. "Electromagnetically actuated active balancer with flux guides." In INTERMAG Asia 2005: Digest of the IEEE International Magnetics Conference. IEEE, 2005. http://dx.doi.org/10.1109/intmag.2005.1463752.

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Ferraro, L. Del, F. Giulii Capponi, R. Terrigi, F. Caricchi, and O. Honorati. "Ironless Axial Flux PM Machine With Active Mechanical Flux Weakening For Automotive Applications." In Conference Record of the 2006 IEEE Industry Applications Conference Forty-First IAS Annual Meeting. IEEE, 2006. http://dx.doi.org/10.1109/ias.2006.256512.

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Tong Xiangqian, Xu Jin, Wu Wenjun, and Xue Junyi. "Active reactor based on harmonic magnetic flux compensation." In Proceedings of the Eighth International Conference on Electrical Machines and Systems. IEEE, 2005. http://dx.doi.org/10.1109/icems.2005.202859.

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Bartelt, Roman, Martin Oettmeier, Carsten Heising, and Volker Staudt. "Flux-based control of 3-phase Active Front End." In 2010 International School on Nonsinusoidal Currents and Compensation (ISNCC). IEEE, 2010. http://dx.doi.org/10.1109/isncc.2010.5524523.

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He, Fanchen, and Philip L. Roe. "The Treatment of Conservation in the Active Flux method." In AIAA AVIATION 2020 FORUM. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2020. http://dx.doi.org/10.2514/6.2020-3032.

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Звіти організацій з теми "Acive Flux"

1

Russell, H. A. J., and S. K. Frey. Canada One Water: integrated groundwater-surface-water-climate modelling for climate change adaptation. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/329092.

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Анотація:
Canada 1 Water is a 3-year governmental multi-department-private-sector-academic collaboration to model the groundwater-surface-water of Canada coupled with historic climate and climate scenario input. To address this challenge continental Canada has been allocated to one of 6 large watershed basins of approximately two million km2. The model domains are based on natural watershed boundaries and include approximately 1 million km2 of the United States. In year one (2020-2021) data assembly and validation of some 20 datasets (layers) is the focus of work along with conceptual model development. To support analysis of the entire water balance the modelling framework consists of three distinct components and modelling software. Land Surface modelling with the Community Land Model will support information needed for both the regional climate modelling using the Weather Research &amp; Forecasting model (WRF), and input to HydroGeoSphere for groundwater-surface-water modelling. The inclusion of the transboundary watersheds will provide a first time assessment of water resources in this critical international domain. Modelling is also being integrated with Remote Sensing datasets, notably the Gravity Recovery and Climate Experiment (GRACE). GRACE supports regional scale watershed analysis of total water flux. GRACE along with terrestrial time-series data will serve provide validation datasets for model results to ensure that the final project outputs are representative and reliable. The project has an active engagement and collaborative effort underway to try and maximize the long-term benefit of the framework. Much of the supporting model datasets will be published under open access licence to support broad usage and integration.
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Husson, Scott M., Viatcheslav Freger, and Moshe Herzberg. Antimicrobial and fouling-resistant membranes for treatment of agricultural and municipal wastewater. United States Department of Agriculture, January 2013. http://dx.doi.org/10.32747/2013.7598151.bard.

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This research project introduced a novel membrane coating strategy to combat biofouling, which is a major problem for the membrane-based treatment of agricultural and municipal wastewaters. The novelty of the strategy is that the membrane coatings have the unique ability to switch reversibly between passive (antifouling) and active (antimicrobial) fouling control mechanisms. This dual-mode approach differs fundamentally from other coating strategies that rely solely on one mode of fouling control. The research project had two complementary objectives: (1) preparation, characterization, and testing of dual-mode polymer nanolayers on planar surfaces and (2) evaluation of these nanolayers as membrane modifiers. The first objective was designed to provide a fundamental understanding of how polymer nanolayer chemistry and structure affect bacterial deposition and to demonstrate the reversibility of chemical switching. The second objective, which focused on membrane development, characterization, and testing, was designed to demonstrate methods for the production of water treatment membranes that couple passive and active biofouling control mechanisms. Both objectives were attained through synergistic collaboration among the three research groups. Using planar silicon and glass surfaces, we demonstrated using infrared spectroscopy that this new polymer coating can switch reversibly between the anti-fouling, zwitterion mode and an anti-microbial, quaternary amine mode. We showed that switching could be done more than 50 times without loss of activity and that the kinetics for switching from a low fouling zwitterion surface to an antimicrobial quaternary amine surface is practical for use. While a low pH was required for switching in the original polymer, we illustrated that by slightly altering the chemistry, it is possible to adjust the pH at which the switching occurs. A method was developed for applying the new zwitterionic surface chemistry onto polyethersulfone (PES) ultrafiltration membranes. Bacteria deposition studies showed that the new chemistry performed better than other common anti-fouling chemistries. Biofilm studies showed that PESultrafiltration membranes coated with the new chemistry accumulated half the biomass volume as unmodified membranes. Biofilm studies also showed that PES membranes coated with the new chemistry in the anti-microbial mode attained higher biofilm mortality than PES membranes coated with a common, non-switchablezwitterionic polymer. Results from our research are expected to improve membrane performance for the purification of wastewaters prior to use in irrigation. Since reduction in flux due to biofouling is one of the largest costs associated with membrane processes in water treatment, using dual-mode nanolayer coatings that switch between passive and active control of biofouling and enable detachment of attached biofoulants would have significant economic and societal impacts. Specifically, this research program developed and tested advanced ultrafiltration membranes for the treatment of wastewaters. Such membranes could find use in membrane bioreactors treating municipal wastewater, a slightly upgraded version of what presently is used in Israel for irrigation. They also may find use for pretreatment of agricultural wastewaters, e.g., rendering facility wastewater, prior to reverse osmosis for desalination. The need to desalinate such impaired waters water for unlimited agricultural use is likely in the near future.
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Altstein, Miriam, and Ronald J. Nachman. Rational Design of Insect Control Agent Prototypes Based on Pyrokinin/PBAN Neuropeptide Antagonists. United States Department of Agriculture, August 2013. http://dx.doi.org/10.32747/2013.7593398.bard.

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The general objective of this study was to develop rationally designed mimetic antagonists (and agonists) of the PK/PBAN Np class with enhanced bio-stability and bioavailability as prototypes for effective and environmentally friendly pest insect management agents. The PK/PBAN family is a multifunctional group of Nps that mediates key functions in insects (sex pheromone biosynthesis, cuticular melanization, myotropic activity, diapause and pupal development) and is, therefore, of high scientific and applied interest. The objectives of the current study were: (i) to identify an antagonist biophores (ii) to develop an arsenal of amphiphilic topically active PK/PBAN antagonists with an array of different time-release profiles based on the previously developed prototype analog; (iii) to develop rationally designed non-peptide SMLs based on the antagonist biophore determined in (i) and evaluate them in cloned receptor microplate binding assays and by pheromonotropic, melanotropic and pupariation in vivo assays. (iv) to clone PK/PBAN receptors (PK/PBAN-Rs) for further understanding of receptor-ligand interactions; (v) to develop microplate binding assays for screening the above SMLs. In the course of the granting period A series of amphiphilic PK/PBAN analogs based on a linear lead antagonist from the previous BARD grant was synthesized that incorporated a diverse array of hydrophobic groups (HR-Suc-A[dF]PRLa). Others were synthesized via the attachment of polyethylene glycol (PEG) polymers. A hydrophobic, biostablePK/PBAN/DH analog DH-2Abf-K prevented the onset of the protective state of diapause in H. zea pupae [EC50=7 pmol/larva] following injection into the preceding larval stage. It effectively induces the crop pest to commit a form of ‘ecological suicide’. Evaluation of a set of amphiphilic PK analogs with a diverse array of hydrophobic groups of the formula HR-Suc-FTPRLa led to the identification of analog T-63 (HR=Decyl) that increased the extent of diapause termination by a factor of 70% when applied topically to newly emerged pupae. Another biostablePK analog PK-Oic-1 featured anti-feedant and aphicidal properties that matched the potency of some commercial aphicides. Native PK showed no significant activity. The aphicidal effects were blocked by a new PEGylated PK antagonist analog PK-dF-PEG4, suggesting that the activity is mediated by a PK/PBAN receptor and therefore indicative of a novel and selective mode-of-action. Using a novel transPro mimetic motif (dihydroimidazole; ‘Jones’) developed in previous BARD-sponsored work, the first antagonist for the diapause hormone (DH), DH-Jo, was developed and shown to block over 50% of H. zea pupal diapause termination activity of native DH. This novel antagonist development strategy may be applicable to other invertebrate and vertebrate hormones that feature a transPro in the active core. The research identifies a critical component of the antagonist biophore for this PK/PBAN receptor subtype, i.e. a trans-oriented Pro. Additional work led to the molecular cloning and functional characterization of the DH receptor from H. zea, allowing for the discovery of three other DH antagonist analogs: Drosophila ETH, a β-AA analog, and a dF analog. The receptor experiments identified an agonist (DH-2Abf-dA) with a maximal response greater than native DH. ‘Deconvolution’ of a rationally-designed nonpeptide heterocyclic combinatorial library with a cyclic bis-guanidino (BG) scaffold led to discovery of several members that elicited activity in a pupariation acceleration assay, and one that also showed activity in an H. zea diapause termination assay, eliciting a maximal response of 90%. Molecular cloning and functional characterization of a CAP2b antidiuretic receptor from the kissing bug (R. prolixus) as well as the first CAP2b and PK receptors from a tick was also achieved. Notably, the PK/PBAN-like receptor from the cattle fever tick is unique among known PK/PBAN and CAP2b receptors in that it can interact with both ligand types, providing further evidence for an evolutionary relationship between these two NP families. In the course of the granting period we also managed to clone the PK/PBAN-R of H. peltigera, to express it and the S. littoralis-R Sf-9 cells and to evaluate their interaction with a variety of PK/PBAN ligands. In addition, three functional microplate assays in a HTS format have been developed: a cell-membrane competitive ligand binding assay; a Ca flux assay and a whole cell cAMP ELISA. The Ca flux assay has been used for receptor characterization due to its extremely high sensitivity. Computer homology studies were carried out to predict both receptor’s SAR and based on this analysis 8 mutants have been generated. The bioavailability of small linear antagonistic peptides has been evaluated and was found to be highly effective as sex pheromone biosynthesis inhibitors. The activity of 11 new amphiphilic analogs has also been evaluated. Unfortunately, due to a problem with the Heliothis moth colony we were unable to select those with pheromonotropic antagonistic activity and further check their bioavailability. Six peptides exhibited some melanotropic antagonistic activity but due to the low inhibitory effect the peptides were not further tested for bioavailability in S. littoralis larvae. Despite the fact that no new antagonistic peptides were discovered in the course of this granting period the results contribute to a better understanding of the interaction of the PK/PBAN family of Nps with their receptors, provided several HT assays for screening of libraries of various origin for presence of PK/PBAN-Ragonists and antagonists and provided important practical information for the further design of new, peptide-based insecticide prototypes aimed at the disruption of key neuroendocrine physiological functions in pest insects.
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Granot, David, and Richard Amasino. Regulation of Senescence by Sugar Metabolism. United States Department of Agriculture, January 2003. http://dx.doi.org/10.32747/2003.7585189.bard.

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Research objectives a. Analyze transgenic plants that undergo rapid senescence due to increased expression of hexokinase. b. Determine if hexokinase-induced senescence accelerates natural senescence using senescence specific promoters that drive expression of a reporter gene (GUS) and a cytokinin producing gene (IPT - isopentyl transferase). c. Isolate and analyze plant genes that suppress sugar-induced cell death (SICD) in yeast, genes that potentially are involved in programmed cell death and senescence in plants. Background to the topic Leaf senescence is a regulated process of programmed cell death (PCD) in which metabolites are recycled to other active parts of the plant. Senescence associated genes (SAGs) are expressed throughout leaf senescence. Sugar flux and metabolism is thought to playa fundamental regulatory role in senescence. We found that transgenic tomato plants with high hexokinase activity, the initial enzymatic step of sugar (hexose) metabolism, undergo rapid leaf senescence, directly correlated with hexokinase activity. These plants provide a unique opportunity to analyze the regulatory role of sugar metabolism in senescence, and its relation to cytokinin, a senescence-inhibiting hormone. In addition, we found that sugar induces programmed cells death of yeast cells in direct correlation to hexokinase activity. We proposed to use the sugar induced cell death (SICD) to isolate Arabidopsis genes that suppress SICD. Such genes could potentially be involved in senescence induced PCD in plants. Major conclusions The promoters of Arabidopsis senescence-associated genes, SAG12 and SAGI3, are expressed in senescing tomato leaves similar to their expression in Arabidopsis leaves, indicating that these promoters are good senescence markers for tomato plants. Increased hexokinase activity accelerated senescence and induced expression of pSAG12 and pSAG13 promoters in tomato plants, suggesting that sugar regulate natural senescence via hexokinase. Expression of IPT, a cytokinin producing gene, under pSAG12 and pSAG13 promoters, delayed senescence of tomato leaves. Yet, senescence accelerated by hexokinase was epistatic over cytokinin, indicating that sugar regulation of senescence is dominant over the senescence-inhibiting hormone. A gene designated SFP1, which is similar to the major super family monosaccharide transporters, is induced during leaf senescence in Arabidopsis and may be involved in sugar transport during senescence. Accordingly, adult leaves accumulate sugars that may accelerate hexokinase activity. Light status of the entire plant affects the senescence of individual leaves. When individual leaves are darkened, senescence is induced in the covered leaves. However, whole adult plant placed in darkness show delayed senescence. In a search for Arabidopsis genes that suppress SICD we isolated 8 cDNA clones which confer partial resistance to SICD. One of the clones encodes a vesicle associated membrane protein - VAMP. This is the first evidence that vesicle trafficking might be involved in cell death. Implications Increased hexokinase activity accelerates senescence. We hypothesized that, reduced hexokinase activity may delay senescence. Preliminary experiments using a hexokinase inhibitor support this possible implication. Currently we are analyzing various practical approaches to delay leaf senescence via hexokinase inhibition. .
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Avnimelech, Yoram, Richard C. Stehouwer, and Jon Chorover. Use of Composted Waste Materials for Enhanced Ca Migration and Exchange in Sodic Soils and Acidic Minespoils. United States Department of Agriculture, June 2001. http://dx.doi.org/10.32747/2001.7575291.bard.

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Анотація:
Restoration of degraded lands and the development of beneficial uses for waste products are important challenges facing our society. In addition there is a need to find useful and environmentally friendly applications for the organic fractions of municipal and other solid waste. Recent studies have shown that composted wastes combined with gypsum or gypsum-containing flue gas desulfurization by-products enhance restoration of sodic soils and acidic minespoils. The mechanism by which this synergistic effect occurs in systems at opposite pH extremes appears to involve enhanced Ca migration and exchange. Our original research objectives were to (1) identify and quantify the active compost components involved in Ca transport, (2) determine the relative affinity of the compost components for Ca and competing metals in the two soil/spoil systems, (3) determine the efficacy of the compost components in Ca transport to subjacent soil and subsequent exchange with native soil cations, and (4) assess the impacts of compost enhanced Ca transport on soil properties and plant growth. Acidic mine spoils: During the course of the project the focus for objective (1) and (2) shifted more towards developing and evaluating methods to appropriately quantify Ca2+ and Al3+ binding to compost derived dissolved organic matter (DOM). It could be shown that calcium complexation by sewage sludge compost derived DOM did not significantly change during the composting process. A method for studying Al3+ binding to DOM was successfully developed and should allow future insight into DOM-Al3+ interactions in general. Laboratory column experiments as well as greenhouse experiments showed that in very acidic mine spoil material mineral dissolution controls solution Al3+ concentration as opposed to exchange with Ca2+. Therefore compost appeared to have no effect on Al3+ and Ca2+ mobility and did not affect subsoil acidity. Sodic alkaline soils: Batch experiments with Na+ saturated cation exchange resins as a model for sodic soils showed that compost home cations exchanged readily with Na+. Unlike filtered compost extracts, unfiltered compost suspensions also significantly increased Ca2+ release from CaCO3. Soil lysimeter experiments demonstrated a clear impact of compost on structural improvement in sodic alkaline soils. Young compost had faster, clearer and longer lasting effects on soil physical and chemical properties than mature compost. Even after 2 growing seasons differences could still be observed. Compost increased Ca2+ concentration in soil solution and solubility of pedogenic CaCO3 that is highly insoluble under alkaline conditions. The solubilized Ca2+ efficiently exchanged Na+ in the compost treated soils and thus greatly improved the soil structure.
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