Log in

Relevant bibliographies by topics / Acive Flux / Journal articles

Journal articles on the topic 'Acive Flux'

To see the other types of publications on this topic, follow the link: Acive Flux.

Author: Grafiati

Published: 14 March 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Acive Flux.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

2

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

3

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

4

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

9

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

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.

Full text

Abstract:

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).

APA, Harvard, Vancouver, ISO, and other styles

11

Dai, Hongbin, and Jun Peng. "Effects of active flux on plasma behavior and weld shape in laser welding of X5CrNi189 stainless steel." Modern Physics Letters B 30, no. 31 (November 20, 2016): 1650375. http://dx.doi.org/10.1142/s0217984916503759.

Full text

Abstract:

In this paper, stainless steel was welded by active flux-aided laser welding method. The effects of single active flux (Cr2O3, SiO2 and TiO2) and composite active flux on laser welding were studied. In the welding process, laser plasma behavior was recorded by a high-speed imaging system. The results show that, with the addition of active flux, the absorption of laser energy and melting efficiency increase. In the laser power of 750 W, effects of active flux on weld depth to width ratio are given by the order: composite active flux [Formula: see text] SiO[Formula: see text] Cr2O[Formula: see text] TiO2. The effect of composite active flux is the most significant and it can increase the weld depth to width ratio to 85%. Active flux can restrict the laser plasma. With the addition of composite active flux, the projected area of laser plasma obtained obviously reduced, and it can be reduced by 41.39%. Active flux cannot obviously change the main components in weld zone, but can change the grains of austenite and ferrite.

APA, Harvard, Vancouver, ISO, and other styles

12

Abbett, W. P., G. H. Fisher, and Y. Fan. "The Emergence of Magnetic Flux in Active Regions." Symposium - International Astronomical Union 203 (2001): 225–28. http://dx.doi.org/10.1017/s0074180900219153.

Full text

Abstract:

Over the past decade, “thin flux tube” models have proven successful in explaining many properties of active regions in terms of magnetic flux tube dynamics in the solar interior. On the other hand, recent 2-D MHD simulations of the emergence of magnetic flux have shown that many of the assumptions adopted in the thin flux tube approximation are invalid. For example, unless the flux tubes exhibit a large degree of initial field line twist — and observations of emerging active regions suggest they do not — they will fragment (break apart) before they are able to emerge through the surface. We attempt to resolve this paradox using a number of 3-D MHD simulations (in the anelastic approximation) that describe the rise and fragmentation of twisted magnetic flux tubes. We find that the degree of fragmentation of an evolving Ω-loop depends strongly on the 3-D geometry of the loop, and that the Coriolis force plays a dynamically important role in the evolution and emergence of magnetic flux.

APA, Harvard, Vancouver, ISO, and other styles

13

Chen, Xiaoqing, and Litong Cai. "Study on the Effect of Membrane Active Surface Orientation in OMBR on Norfloxacin Wastewater Treatment." International Journal of Chemical Engineering and Applications 12, no. 4 (December 2021): 26–29. http://dx.doi.org/10.18178/ijcea.2021.12.4.792.

Full text

Abstract:

The forward osmosis membrane bioreactor (OMBR) is a kind of new treatment technology which applied forward osmosis technology to the membrane bioreactor. In this paper, the OMBR was adopted to tackle with the typical antibiotic wastewater.The influence of orientation was investigated. The results showed that the magnesium chloride solution with high osmotic pressure is advantageous for OMBR due to its superior membrane flux and a better producing water quality and the membrane flux decreases with a rise of the concentration of sewage and sludge. In this condition, the removal rate of COD and norfloxacin is 84.21% and 93.70%, respectively.

APA, Harvard, Vancouver, ISO, and other styles

14

Sullivan, S. K., and P. L. Smith. "Active potassium secretion by rabbit proximal colon." American Journal of Physiology-Gastrointestinal and Liver Physiology 250, no. 4 (April 1, 1986): G475—G483. http://dx.doi.org/10.1152/ajpgi.1986.250.4.g475.

Full text

Abstract:

Fluxes of K from mucosa to serosa or serosa to mucosa have been examined in stripped preparations of rabbit proximal and distal colon in vitro under short-circuit conditions in Ussing chambers. Results from these studies demonstrate that steady-state radioisotopic fluxes of K are achieved after 90 min and remain constant for at least 2 h. Determination of the K concentration dependence of the serosal-to-mucosal K flux revealed that this flux contains both saturable and nonsaturable components. Addition of ouabain (0.1 mM) abolished the saturable component of the serosal-to-mucosal K flux. The mucosal-to-serosal K flux is a linear function of K concentration between 1 and 20 mM under basal conditions. In paired tissues, serosal-to-mucosal K flux is always greater than mucosal-to-serosal flux under basal conditions resulting in net K secretion. However, addition of barium (2 mM) to the mucosal or serosal bathing solution had no significant effect on either unidirectional or net K fluxes. In addition, mucosal bumetanide (0.1 mM) or removal of Cl from both bathing solutions had no significant effect on unidirectional or net K fluxes. In rabbit distal colon, Cl removal from the bathing solutions significantly reduced serosal-to-mucosal K flux, resulting in net K absorption. These results indicate that rabbit proximal colon like rabbit distal colon actively secretes K. However, unlike distal colon the proximal colon does not possess an active K uptake mechanism at the apical cell membrane.(ABSTRACT TRUNCATED AT 250 WORDS)

APA, Harvard, Vancouver, ISO, and other styles

15

Chumak, O. V., and Hong-Qi Zhang. "Size-Flux Relation in Solar Active Regions." Chinese Journal of Astronomy and Astrophysics 3, no. 2 (April 2003): 175–82. http://dx.doi.org/10.1088/1009-9271/3/2/175.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Fan, Y., G. H. Fisher, and A. N. McClymont. "Dynamics of emerging active region flux loops." Astrophysical Journal 436 (December 1994): 907. http://dx.doi.org/10.1086/174967.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Terasawa, Nobuo. "Intergalactic ionizing flux from active galactic nuclei." Astrophysical Journal 392 (June 1992): L15. http://dx.doi.org/10.1086/186414.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

MacTaggart, D. "Flux emergence within mature solar active regions." Astronomy & Astrophysics 531 (June 22, 2011): A108. http://dx.doi.org/10.1051/0004-6361/201117099.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Hartsell, T. P., and P. L. Bornmann. "Active region evolution and solar flux variations." Solar Physics 152, no. 1 (June 1994): 189–94. http://dx.doi.org/10.1007/bf01473203.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Van Driel-Gesztelyi, L., and K. Petrovay. "Asymmetric flux loops in active regions, I." Solar Physics 126, no. 2 (April 1990): 285–98. http://dx.doi.org/10.1007/bf00153051.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Stancil, Daniel D. "ACTIVE NEGATIVE INDUCTOR BASED ON MAGNETIC FLUX." Progress In Electromagnetics Research C 32 (2012): 259–69. http://dx.doi.org/10.2528/pierc12071708.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Petrovay, K., J. C. Brown, L. van Driel-Gesztelyi, L. Fletcher, M. Marik, and G. Stewart. "Asymmetric flux loops in active regions, II." Solar Physics 127, no. 1 (May 1990): 51–64. http://dx.doi.org/10.1007/bf00158513.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Liu, Liming, Zhaodong Zhang, Gang Song, and Yong Shen. "Effect of Cadmium Chloride Flux in Active Flux TIG Welding of Magnesium Alloys." MATERIALS TRANSACTIONS 47, no. 2 (2006): 446–49. http://dx.doi.org/10.2320/matertrans.47.446.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Korzeniowska, Malgorzata, Jan P. Madej, Tadeusz Stefaniak, and Wieslaw Kopec. "Influence of Selenium on the Morphology of Immune System Organs in Healthy Broilers." Acta Veterinaria 69, no. 4 (December 1, 2019): 379–90. http://dx.doi.org/10.2478/acve-2019-0032.

Full text

Abstract:

Abstract This study aimed to establish the effect of dietary supplementation in broiler chickens of organic and inorganic selenium on the weight and structure of the thymus, bursa of Fabricius and spleen. Three dietary regimes were studied in Flex and F15 Hubbard chickens: (i) control, (ii) diets containing 0.5 mg organic selenium/kg by selenized yeast, (iii) diets supplemented with 0.5 mg ionic selenium/kg (sodium selenite). The results showed that the feed additives did not affect the relative weight of the immune system organs, i.e. bursa of Fabricius, thymus and spleen. The organic selenium in the F15 resulted in thinning of the thymic cortex and partial depletion of the lymphoid cells. Moreover, both the organic and inorganic selenium supplementation resulted in depopulation of bursal medulla from lymphocytes in the F15 group. In contrast, in Flex chickens no significant differences in histological structure and morphometric values of lymphoid organs between chickens fed organic and inorganic selenium were found.

APA, Harvard, Vancouver, ISO, and other styles

25

Schunker, H., C. Baumgartner, A. C. Birch, R. H. Cameron, D. C. Braun, and L. Gizon. "Average motion of emerging solar active region polarities." Astronomy & Astrophysics 640 (August 2020): A116. http://dx.doi.org/10.1051/0004-6361/201937322.

Full text

Abstract:

Context. The tilt of solar active regions described by Joy’s law is essential for converting a toroidal field to a poloidal field in Babcock-Leighton dynamo models. In thin flux tube models the Coriolis force causes what we observe as Joy’s law, acting on east-west flows as they rise towards the surface. Aims. Our goal is to measure the evolution of the average tilt angle of hundreds of active regions as they emerge, so that we can constrain the origins of Joy’s law. Methods. We measured the tilt angle of the primary bipoles in 153 emerging active regions (EARs) in the Solar Dynamics Observatory Helioseismic Emerging Active Region survey. We used line-of-sight magnetic field measurements averaged over 6 h to define the polarities and measure the tilt angle up to four days after emergence. Results. We find that at the time of emergence the polarities are on average aligned east-west, and that neither the separation nor the tilt depends on latitude. We do find, however, that EARs at higher latitudes have a faster north-south separation speed than those closer to the equator at the emergence time. After emergence, the tilt angle increases and Joy’s law is evident about two days later. The scatter in the tilt angle is independent of flux until about one day after emergence, when we find that higher-flux regions have a smaller scatter in tilt angle than lower-flux regions. Conclusions. Our finding that active regions emerge with an east-west alignment is consistent with earlier observations, but is still surprising since thin flux tube models predict that tilt angles of rising flux tubes are generated below the surface. Previously reported tilt angle relaxation of deeply anchored flux tubes can be largely explained by the change in east-west separation. We conclude that Joy’s law is caused by an inherent north-south separation speed present when the flux first reaches the surface, and that the scatter in the tilt angle is consistent with buffeting of the polarities by supergranulation.

APA, Harvard, Vancouver, ISO, and other styles

26

Wang, Jingxiu, and Zhongxian Shi. "Pre-Eruption Disturbance of an Active Filament." International Astronomical Union Colloquium 141 (1993): 397–400. http://dx.doi.org/10.1017/s0252921100029493.

Full text

Abstract:

AbstractA pre-eruption disturbance of an active filament has been observed. The disturbance is characterized by untwisting rotation and vigorous upward motion. It starts at the site where microflares took place, and appears in the late phase of magnetic flux cancellation beneath the central part of the filament, when more than 1020 Mx flux had disappeared.

APA, Harvard, Vancouver, ISO, and other styles

27

Ostapenko, V. F., and V. A. Krasnoperov. "Analysis of natural neutron flux in a seismically active zone." Natural Hazards and Earth System Sciences 3, no. 6 (December 31, 2003): 777–80. http://dx.doi.org/10.5194/nhess-3-777-2003.

Full text

Abstract:

Abstract. In a seismically active zone in the near Almaty area (Kazakhstan) since 1996 observations of variations of a natural neutron flux have been conducted. Sometimes the neutron flux rises sharply within the one-hour interval in comparison with the background. It occurs on the eve of activation of seismic processes. Increase of the neutron flux level had taken place from 1 h to 10 days prior to earthquakes. It is also indicated a tendency of growth of the anomaly level in accordance with the growth of energetic class of the subsequent earthquake. A character of connection between the neutron flux and earthquakes is still not clear. It is proposed that the neutron flux anomalies caused by variations of cosmic radiation intensity under action of fluxes of solar material, which is burst into interplanetary space (solar wind) during solar flares. Energy of the solar wind transferred to Earth puts into action a trigger mechanism of the process of initiation of earthquakes at those places where conditions have already been prepared for them. The neutron flux anomalies can be used as substantial additional information for classical geophysical methods of short-term earthquake prediction.

APA, Harvard, Vancouver, ISO, and other styles

28

López Fuentes, M. C., C. H. Mandrini, and P. Démoulin. "Twist and writhe of δ-island active regions." Proceedings of the International Astronomical Union 6, S273 (August 2010): 153–56. http://dx.doi.org/10.1017/s174392131101516x.

Full text

Abstract:

AbstractWe study the magnetic helicity properties of a set of peculiar active regions (ARs) including δ-islands and other high-tilt bipolar configurations. These ARs are usually identified as the most active in terms of flare and CME production. Due to their observed structure, they have been associated with the emergence of magnetic flux tubes that develop a kink instability. Our main goal is to determine the chirality of the twist and writhe components of the AR magnetic helicity in order to set constrains on the possible mechanisms producing the flux tube deformations. We determine the magnetic twist comparing observations of the AR coronal structure with force-free models of the magnetic field. We infer the flux-tube writhe from the rotation of the main magnetic bipole during the observed evolution. From the relation between the obtained twist and writhe signs we conclude that the development of the kink instability cannot be the single mechanism producing deformed flux-tubes.

APA, Harvard, Vancouver, ISO, and other styles

29

Zhou, Y. Y., Y. J. Lu, T. G. Wang, K. N. Yu, and E. C. M. Young. "Correlation between VLBI Radio Flux and Gamma-Ray Flux of EGRET Active Galactic Nuclei." Astrophysical Journal 484, no. 1 (July 20, 1997): L47—L50. http://dx.doi.org/10.1086/310764.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Fuentes, M. C. López, C. H. Mandrini, and P. Démoulin. "Study of helicity properties of peculiar active regions." Proceedings of the International Astronomical Union 5, S264 (August 2009): 102–4. http://dx.doi.org/10.1017/s1743921309992493.

Full text

Abstract:

AbstractPeculiar solar active regions (ARs), such as δ-islands and other high tilt bipoles, are commonly associated with the emergence of severely deformed magnetic flux tubes. Therefore, the study of these ARs provides valuable information on the origin and evolution of magnetic structures in the solar interior. Here, we infer the magnetic helicity properties of the flux tubes associated to a set of peculiar ARs by studying the evolution of photospheric magnetograms (SOHO/MDI) and coronal observations (SOHO/EIT and TRACE) in combination with force-free models of the magnetic field. We discuss how our results relate to different models of the evolution of emerging magnetic flux tubes.

APA, Harvard, Vancouver, ISO, and other styles

31

Garvin, J. L., M. B. Burg, and M. A. Knepper. "Active NH4+ absorption by the thick ascending limb." American Journal of Physiology-Renal Physiology 255, no. 1 (July 1, 1988): F57—F65. http://dx.doi.org/10.1152/ajprenal.1988.255.1.f57.

Full text

Abstract:

Isolated perfused medullary thick ascending limbs from rabbits were studied to determine the mechanism of ammonium ion absorption. Under control conditions, thick ascending limbs spontaneously absorbed NH4+ and generated a lumen-positive potential. When these tubules were chemically voltage clamped to lumen-negative potentials by lowering the bath NaCl concentration, NH4+ absorption persisted. Thus NH4+ was absorbed against an electrochemical gradient. The active flux accounts for most of the net flux under control conditions, the remainder being due to passive paracellular NH4+ diffusion. The NH4+ permeability, measured in separate experiments, was high (1.50 +/- 0.25 x 10(-4) cm/s) compared with values in other segments. The NH3 permeability was relatively low (3.1 +/- 0.5 x 10(-3) cm/s). Luminal furosemide (10(-4) M) eliminated most of the active NH4+ flux, indicating that a major fraction of the active flux is dependent on apical entry of NH4+ via the Na+ -K+ -2Cl- cotransporter (presumably by substitution for K+). The remaining active flux was completely inhibited by 10(-4) M ouabain in the bath. Active chloride absorption was maintained when NH4+ entirely replaced K+ in bath and perfusate, indicating that NH4+ substitutes for K+ on the apical cotransporter and the basolateral Na+ -K+ -ATPase. Ammonium absorption provides an active "single effect" for countercurrent multiplication of NH4+ in the renal medulla.

APA, Harvard, Vancouver, ISO, and other styles

32

Kutsenko, Aleksandr S., and Valentina I. Abramenko. "Flux emergence rate of active regions as a probe for turbulent dynamo action." Proceedings of the International Astronomical Union 13, S340 (February 2018): 299–300. http://dx.doi.org/10.1017/s1743921318001047.

Full text

Abstract:

AbstractWe analyze the flux emergence rate of solar active regions (ARs). Numerical simulations by other authors suggest that the flux emergence rate depends on the AR’s twist. To prove this statement observationally, we make a comparison of the flux emergence rate and twist of 215 emerging ARs. Our results confirm that the correlation exists: the higher the twist the higher the flux emergence rate of an AR. We suppose that the difference in the twist can be caused by chaotic influence of the convective plasma motions on the lifting magnetic flux tube.

APA, Harvard, Vancouver, ISO, and other styles

33

Maggi, Claudio, Luca Angelani, Giacomo Frangipane, and Roberto Di Leonardo. "Currents and flux-inversion in photokinetic active particles." Soft Matter 14, no. 24 (2018): 4958–62. http://dx.doi.org/10.1039/c8sm00788h.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Livadiotis, George, and Xenophon Moussas. "The maximum magnetic flux in an active region." Proceedings of the International Astronomical Union 4, S257 (September 2008): 101–8. http://dx.doi.org/10.1017/s1743921309029159.

Full text

Abstract:

AbstractThe Photometric-Magnetic Dynamical model handles the evolution of an individual sunspot as an autonomous nonlinear, though integrable, dynamical system. The model considers the simultaneous interplay of two different interacted factors: The photometric and magnetic factors, respectively, characterizing the evolution of the sunspot visible area A on the photosphere, and the simultaneous evolution of the sunspot magnetic field strength B. All the possible sunspots are gathered in a specific region of the phase space (A, B). The separatrix of this phase space region determines the upper limit of the values of sunspot area and magnetic strength. Consequently, an upper limit of the magnetic flux in an active region is also determined, found to be ≈7.23 × 1023 Mx. This value is phenomenologically equal to the magnetic flux concentrated in the totality of the granules of the quite Sun. Hence, the magnetic flux concentrated in an active region cannot exceed the one concentrated in the whole photosphere.

APA, Harvard, Vancouver, ISO, and other styles

35

Hou, Yijun, Jun Zhang, Ting Li, and Shuhong Yang. "Multi-flux-rope system in solar active regions." Proceedings of the International Astronomical Union 15, S354 (June 2019): 443–47. http://dx.doi.org/10.1017/s1743921319009967.

Full text

Abstract:

AbstractMagnetic flux rope (MFR) is closely connected with solar eruptions, such as flares and coronal mass ejections. The classical scenario assumes a single MFR for each eruption, but it is reasonable to expect multiple MFRs in a complex active region (AR). Statistically investigating AR 11897, we verify the existence of multiple MFR proxies during the AR evolution. Recently, AR 12673 in 2017 September produced the two largest flares in Solar Cycle 24. The evolutions of the AR magnetic fields and the two large flares reveal that significant flux emergence and successive interactions between different emerging dipoles resulted in the formations of multiple MFRs and twisted loop bundles, which successively erupted like a chain reaction within several minutes before the peaks of the two flares. We propose that the eruptions of a multi-flux-rope system can rapidly release enormous magnetic energy and result in large flares in solar AR.

APA, Harvard, Vancouver, ISO, and other styles

36

Choudhary, Debi Prasad, P. Venkatakrishnan, and Sanjay Gosain. "On Magnetic Flux Imbalance in Solar Active Regions." Astrophysical Journal 573, no. 2 (July 10, 2002): 851–56. http://dx.doi.org/10.1086/340754.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

WÃ¶rdenweber, R. "Magnetic flux in active and passive superconducting devices." Physica C: Superconductivity 369, no. 1-4 (March 15, 2002): 141–48. http://dx.doi.org/10.1016/s0921-4534(01)01232-1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Boldea, Ion, Mihaela Codruta Paicu, Gheorghe-Daniel Andreescu, and Frede Blaabjerg. "“Active Flux” DTFC-SVM Sensorless Control of IPMSM." IEEE Transactions on Energy Conversion 24, no. 2 (June 2009): 314–22. http://dx.doi.org/10.1109/tec.2009.2016137.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Giménez, Alvaro, and Constanze La Dous. "The EUV Flux of Chromospherically Active Binary Stars." International Astronomical Union Colloquium 152 (1996): 181–82. http://dx.doi.org/10.1017/s0252921100035946.

Full text

Abstract:

We have compared EUVE and ROSAT/WFC photometric measurements of chromospherically active binary systems at around 100 Å. Long term variations have found for some 20% of the systems as well as a tight linear correlation between the EUV and soft X-ray fluxes.

APA, Harvard, Vancouver, ISO, and other styles

40

Owusu-Ansah, Prince, Alex Frimpong Justice, Timothy Alhassan, and Saviour Kwame Woangbah. "Controlling Magnetic Flux Density in Active Magnetic Bearings." IOSR Journal of Mechanical and Civil Engineering 13, no. 04 (April 2016): 25–32. http://dx.doi.org/10.9790/1684-1304022532.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Martin, SF, SHB Livi, and J. Wang. "The Cancellation of Magnetic Flux. II. In a Decaying Active Region." Australian Journal of Physics 38, no. 6 (1985): 929. http://dx.doi.org/10.1071/ph850929.

Full text

Abstract:

An active region was studied in detail during its period of decay from 3 to 8 August 1984 using Ha filtergrams and videomagnetograms acquired at the Big Bear Solar Observatory. The decay was initiated by a process of fragmentation in which very small knots of magnetic flux separated from larger concentrations of flux. The fragmentation was observed at discrete locations around the periphery of both the dominant areas of negative and positive field, but possibly occurred more frequently in the main polarity inversion zone. The fragmentation and migration of knots of magnetic flux were common predecessors to the disappearance of flux.

APA, Harvard, Vancouver, ISO, and other styles

42

Rochelle, Lori G., Sangita Deveshwar, Anikó Náray-Fejes-Tóth, and Géza Fejes-Tóth. "Active calcium absorption in primary cultures of cortical collecting duct cells." Canadian Journal of Physiology and Pharmacology 71, no. 7 (July 1, 1993): 491–96. http://dx.doi.org/10.1139/y93-071.

Full text

Abstract:

Primary cultures of rabbit cortical collecting duct (CCD) cells demonstrated accumulation of Ca at the basolateral (BL) side when cultured on either impermeable or permeable supports. Cell monolayers cultured on impermeable plastic surfaces absorbed Ca with such avidity that hydroxyapatite crystals formed. When cultured on a permeable matrix, the cells demonstrated significant net apical (A) to BL Ca transport against a lumen negative transepithelial potential difference. A steady-state BL/A [Ca] ratio of 120 developed across monolayers in 24 h on days 6 through 8 postseeding. Initial rates of unidirectional 45Ca fluxes on days 6 through 8 indicated a negligible BL to A flux (5.4 ± 2.6 nmol∙h−1∙cm−2) compared with A to BL 45Ca flux (99.4 ± 19.4 nmol∙h−1∙cm−2). Parathyroid hormone applied to the BL side had no significant effect on either unidirectional 45Ca flux, but the second messenger analog, 8-bromoadenosine cyclic monophosphate, increased the A to BL flux by 65%. Inhibiting the Na+–K+ ATPase with ouabain (10−4 M) reduced the A to BL flux by 77%; however, a significant net A to BL flux still remained. Apical addition of amiloride (2 × 10−5 M) did not affect either unidirectional 45Ca flux. In addition, the inorganic Ca channel blockers Ni2+ (100 μM and 1 mM), La3+ (100 μM and 1 mM), and Cd2+ (20 and 50 μM) did not significantly inhibit either unidirectional 45Ca flux. These results demonstrate that CCD monolayers actively absorb Ca and this can be stimulated by cyclic AMP, raising the possibility that apical Ca entry does not involve amiloride-sensitive channels, or typical Ca channels.Key words: calcium transport, cortical collecting duct, cultured cells.

APA, Harvard, Vancouver, ISO, and other styles

43

Pakhomov, Evgeny A., Yasha Podeswa, Brian P. V. Hunt, and Lian E. Kwong. "Vertical distribution and active carbon transport by pelagic decapods in the North Pacific Subtropical Gyre." ICES Journal of Marine Science 76, no. 3 (September 27, 2018): 702–17. http://dx.doi.org/10.1093/icesjms/fsy134.

Full text

Abstract:

Abstract Pelagic decapods were sampled during August 2011 in the central North Pacific Subtropical Gyre (NPSG). Depth-stratified samples using a MOCNESS-10 (10 m2 Multiple Opening/Closing Net and Environmental Sensing System) were collected at two stations to the west and north of the Hawaiian island of Oahu: Station Kahe: 21°20.6′N–158°16.4′W and Station ALOHA: 22°45′N–158°00′W. Total decapod abundance and biomass were 4.3 ind. m−2 and 0.71 gDW m−2. While 40 decapod taxa were identified, only 22 species were sampled sufficiently to study quantitatively their vertical migrations. All species were classified into three migration groups: full migrators (6 species); partial migrators (13 species); and non-migrators (3 species). Using measured local temperature profiles along with decapod densities and published models of respiration, excretion and mortality as well as gut fullness data, the individual and total active downward carbon flux was calculated. Active carbon flux of migrating decapods ranged from 383 to 625 µgC m−2 day−1. This active flux was equal to 4.8–7.8% of passive flux at the mean nighttime residence depth of ∼711 m), 2.1–3.4% of passive flux at the mean daytime residence depth (∼262 m), and 1.5–2.4% of passive flux at the base of the euphotic zone (∼173 m). Mortality flux accounted for ∼70% of total active flux, followed by gut flux—∼18%.

APA, Harvard, Vancouver, ISO, and other styles

44

Reenstra, W. W., J. D. Bettencourt, and J. G. Forte. "Active K+ absorption by the gastric mucosa: inhibition by omeprazole." American Journal of Physiology-Gastrointestinal and Liver Physiology 250, no. 4 (April 1, 1986): G455—G460. http://dx.doi.org/10.1152/ajpgi.1986.250.4.g455.

Full text

Abstract:

Unidirectional fluxes of K+ across the histamine-stimulated frog gastric mucosa bathed in Cl(-)-Ringer were measured. Comparison of nutrient-to-secretory and secretory-to-nutrient K+ fluxes determined using either 42K or 86Rb as radioisotopic tracers gave identical results, and thus either isotope could be used for K+ flux measurements; the majority of these experiments used 86Rb as the tracer. Short-circuited mucosas maintained a small net absorption of 0.07 +/- 0.03 mueq X cm-2 X h-1 (n = 9). Omeprazole decreased acid secretion from 4.98 +/- 0.58 to 0.08 +/- 0.02 mueq X cm-2 X h-1 and reversed the direction of net K+ flux giving a net secretion of 0.09 +/- 0.04 mueq X cm-2 X h-1. Ouabain increased the rate of K+ absorption to 0.32 +/- 0.08 mueq X cm-2 X h-1 with a flux ratio (JKn----s/JKs----n) of 0.31 +/- 0.09; subsequent addition of omeprazole significantly decreased the rate of K+ absorption and increased the flux ratio. Omeprazole did not alter the fraction of transmucosal current carried by either K+ or Cl-. For omeprazole inhibited-mucosas at open circuit increasing the secretory osmolarity by 100 mosM with sucrose decreased the transmucosal resistance by 14% and increased nutrient-to-secretory K+ flux by 31%. For actively secreting mucosas no significant changes were seen in either parameter. These results are shown to be consistent with an electroneutral apical H+-K+ exchange pump and diffusion from the gland lumen-to-the secretory fluid, being rate limiting for K+ flux.

APA, Harvard, Vancouver, ISO, and other styles

45

Cai, Yangchuan, Zhen Luo, Zunyue Huang, and Yida Zeng. "Effect of cerium oxide flux on active flux TIG welding of 800 MPa super steel." Journal of Materials Processing Technology 230 (April 2016): 80–87. http://dx.doi.org/10.1016/j.jmatprotec.2015.11.008.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Schüssler, M. "Flux Tubes and Dynamos." Symposium - International Astronomical Union 157 (1993): 27–39. http://dx.doi.org/10.1017/s0074180900173826.

Full text

Abstract:

The structure of solar surface magnetic fields, the way they erupt from the the convection zone below, and processes like flux expulsion and fragmentation instabilities support the view that magnetic flux in a stellar convection zone is in an intermittent, fragmented state which can be described as an ensemble of magnetic flux tubes. Depending on size and field strength, the dynamics of magnetic flux tubes can strongly differ from the behavior of a passive, diffuse field which is often assumed in conventional mean-field dynamo theory. Observed properties of active regions like emergence in low latitudes, Hale's polarity rules, tilt angles, and the process of sunspot formation from smaller fragments, together with theoretical considerations of the dynamics of buoyant flux tubes indicate that the magnetic structures which erupt in an emerging active region are not passive to convection and originate in a source region (presumably an overshoot layer below the convection zone proper) with a field strength of at least 105 G, far beyond the equipartition field strength with respect to convective flows. We discuss the consequences of such a situation for dynamo theory of the solar cycle and consider the possibility of dynamo models on the basis of flux tubes. A simple, illustrative example of a flux tube dynamo is presented.

APA, Harvard, Vancouver, ISO, and other styles

47

Wang, Jincheng, Xiaoli Yan, Defang Kong, Zhike Xue, Liheng Yang, Qiaoling Li, Yan Zhang, and Hao Li. "Naked emergence of an anti-Hale active region." Astronomy & Astrophysics 652 (August 2021): A55. http://dx.doi.org/10.1051/0004-6361/202140685.

Full text

Abstract:

Aims. In order to understand the emergence of the active region, we investigate the emerging process and magnetic properties of a naked anti-Hale active region during the period between August 24 to 25, 2018. Methods. Using the data from Helioseismic and Magnetic Imager on board the Soar Dynamic Observatory and the New Vacuum Solar Telescope, we calculated different evolving parameters (such as pole separation, tilt angle) and magnetic parameters (such as vertical electric current, force-free parameter, relative magnetic helicity) during the emergence of the active region. With these calculated parameters and some reasonable assumptions, we use two different methods to estimate the twist of the active region. Results. The magnetic flux and pole separation continue increasing while the tilt angle exhibits a decreasing pattern during the emergence of the active region. The increase of the pole separation is mainly contributed as a result of the enhancement in the longitude direction. A power-law relationship between pole separation and total flux is found during the emergence of the active region. On the other hand, it is found that both the positive and negative electric currents increased equivalently and the average flux-weighted force-free parameter α̃ remains almost consistently positive, on the order of ∼10−8 m−1. The relative magnetic helicity is mainly contributed by the shear term, while the relative magnetic helicity injection flux of the shear term changes its sign at the latter stage of the emergence. The twist number of the whole active region remains on the order of 10−1 turns during the emergence of the active region. Conclusions. We find that the magnetic flux tube with low twist also could emerge into the solar atmosphere.

APA, Harvard, Vancouver, ISO, and other styles

48

Inoue, H. "GINGA Observations of Active Galactic Nuclei." Symposium - International Astronomical Union 159 (1994): 73–82. http://dx.doi.org/10.1017/s0074180900174868.

Full text

Abstract:

Ginga observed 116 AGNs during its operational life from 1987 to 1991: Among them, there were 55 Seyfert galaxies, 42 quasars, 9 BL Lac objects and 10 other AGNs, although the classification is not strict. From these AGN observations, a number of fruitful results were obtained. In this review, I briefly summarize the Ginga observations of AGNs and show several similarities between the Seyfert-type AGNs and the galactic black hole candidates. I also discuss two inverse correlations between the break energy of the power law spectrum and the flux observed from the black hole candidate GS2023+338 and between the equivalent width of the iron fluorescent line and the continuum flux observed from NGC4151.

APA, Harvard, Vancouver, ISO, and other styles

49

Fludra, A., and J. Ireland. "Diagnostics of Coronal Heating in Solar Active Regions." Symposium - International Astronomical Union 219 (2004): 478–82. http://dx.doi.org/10.1017/s0074180900182488.

Full text

Abstract:

We study the relationship between EUV spectral line intensities and the photospheric magnetic field in solar active regions, using magnetograms from SOHO-MDI and EUV spectra of the Fe XVI 360.8 Â line (2 × 106 K) and the O V 629.7 A line (220,000 K) from the Coronal Diagnostic Spectrometer on SOHO, recorded for several active regions. We overlay and compare spatial patterns of the O V emission and the magnetic flux concentrations, with a 4″ x 4″ spatial resolution, and search for a relationship between the local O V line intensity and the photospheric magnetic flux density in each active region. While this dependence exhibits a certain amount of scatter, it can be represented by a power law fit. The average power index from all regions is 0.7 ± 0.2. Applying static loop models, we derive the dependence of the heating rate on the magnetic flux density, Eh ∝ B0.8, and compare it to the dependence predicted by the coronal heating models.

APA, Harvard, Vancouver, ISO, and other styles

50

Birch, Aaron C., Hannah Schunker, Douglas C. Braun, Robert Cameron, Laurent Gizon, Björn Löptien, and Matthias Rempel. "A low upper limit on the subsurface rise speed of solar active regions." Science Advances 2, no. 7 (July 2016): e1600557. http://dx.doi.org/10.1126/sciadv.1600557.

Full text

Abstract:

Magnetic field emerges at the surface of the Sun as sunspots and active regions. This process generates a poloidal magnetic field from a rising toroidal flux tube; it is a crucial but poorly understood aspect of the solar dynamo. The emergence of magnetic field is also important because it is a key driver of solar activity. We show that measurements of horizontal flows at the solar surface around emerging active regions, in combination with numerical simulations of solar magnetoconvection, can constrain the subsurface rise speed of emerging magnetic flux. The observed flows imply that the rise speed of the magnetic field is no larger than 150 m/s at a depth of 20 Mm, that is, well below the prediction of the (standard) thin flux tube model but in the range expected for convective velocities at this depth. We conclude that convective flows control the dynamics of rising flux tubes in the upper layers of the Sun and cannot be neglected in models of flux emergence.

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!