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45 results on '"Medvedev, M"'

1. GdFe$_2$ Laves phase intermetallic system under pressure: an ab-initio study

Author

E., Kokorina E., V., Medvedev M., and A, Nekrasov I.

Subjects
Condensed Matter - Materials Science, Condensed Matter::Materials Science, Condensed Matter::Superconductivity, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, Condensed Matter::Strongly Correlated Electrons
Abstract

Here we perform $ab-initio$ study of Curie temperature $T_C$ under hydrostatic pressure for intermetallic compound GdFe$_2$. To calculate $T_C$ for GdFe$_2$ we applied mean-field solution of the Heisenberg model for several magnetic sublattices with DFT/LDA calculated values of necessary exchange interaction integrals and local magnetic moments. To compare with available experimental data pressure values were taken from zero up to about 70 Kbar. It corresponds to 2\% compression of the volume of the unit cell. In agreement with experimental data $T_C$ grows under pressure. It was shown that Fe ions magnetic sublattice alone provides only about 75\% of the experimental Curie temperature $T_C^{exp}$. Gd sublattice is found to give very weak contribution to the $T_C^{exp}$. Here we show that the missing 25 \% of $T_C^{exp}$ comes from Fe-Gd exchange pairs., Comment: 4 pages, 1 table

Published
2019
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2. Simulation of Relativistic Jets and Associated Self-consistent Radiation

Author

Nishikawa, K. -I., Choi, E. J., Min, K., Hardee, P., Mizuno, Y., Zhang, B., Niemiec, J., Medvedev, M., Nordlund, A., Fredriksen, J., Pohl, M., Sol, H., Hartmann, D. H., Fishman, G. J., Laboratoire Univers et Théories (LUTH (UMR_8102)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)

Subjects
Physics, [PHYS]Physics [physics], High Energy Astrophysical Phenomena (astro-ph.HE), Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Electron, Plasma, 01 natural sciences, Magnetic field, Weibel instability, Particle acceleration, Lorentz factor, symbols.namesake, Astrophysical jet, Deflection (physics), 13. Climate action, Quantum electrodynamics, 0103 physical sciences, symbols, 010306 general physics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Astrophysics - High Energy Astrophysical Phenomena, 010303 astronomy & astrophysics, ComputingMilieux_MISCELLANEOUS, Astrophysics::Galaxy Astrophysics
Abstract

lasma instabilities excited in collisionless shocks are responsible for particle acceleration. We have investigated the particle acceleration and shock structure associated with an unmagnetized relativistic electron-positron jet propagating into an unmagnetized electron-positron plasma. Cold jet electrons are thermalized and slowed while the ambient electrons are swept up to create a partially developed hydrodynamic-like shock structure. In the leading shock, electron density increases by a factor of about 3.5 in the simulation frame. Strong electromagnetic fields are generated in the trailing shock and provide an emission site. These magnetic fields contribute to the electron's transverse deflection behind the shock. Our initial results of a jet-ambient interaction with anti-parallel magnetic fields show pile-up of magnetic fields at the colliding shock, which may lead to reconnection and associated particle acceleration. We will investigate the radiation in transient stage as a possible generation mechanism of precursors of prompt emission. In our simulations we calculate the radiation from electrons in the shock region. The detailed properties of this radiation are important for understanding the complex time evolution and spectral structure in gamma-ray bursts, relativistic jets, and supernova remnants., Comment: 4 pages, 2 figures, 2011 Fermi Symposium proceedings - eConf C110509

Published
2011
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3. Ab Initio Exchange Interactions and Magnetic Properties of Intermetallic Compound Gd(2)Fe(17-x)Ga(x)

Author

Kokorina, E. E., Medvedev, M. V., and Nekrasov, I. A.

Subjects
Condensed Matter - Strongly Correlated Electrons, Strongly Correlated Electrons (cond-mat.str-el), FOS: Physical sciences
Abstract

Intermetallic compounds R2Fe17 are perspective for applications as permanent magnets. Technologically these systems must have Curie temperature Tc much higher than room temperature and preferably have easy axis anisotropy. At the moment highest Tc among stoichiometric R2Fe17 materials is 476 K, which is not high enough. There are two possibilities to increase Tc: substitution of Fe ions with non-magnetic elements or introduction of light elements into interstitial positions. In this work we have focused our attention on substitution scenario of Curie temperature rising observed experimentally in Gd(2)Fe(17-x)Ga(x) (x=0,3,6) compounds. In the framework of the LSDA approach electronic structure and magnetic properties of the compounds were calculated. Ab initio exchange interaction parameters within the Fe sublattice for all nearest Fe ions were obtained. Employing the theoretical values of exchange parameters Curie temperatures Tc of Gd(2)Fe(17-x)Ga(x) within mean-field theory were estimated. Obtained values of Tc agree well with experiment. Also LSDA computed values of total magnetic moment coincide with experimental ones., Comment: 4 pages, 4 figures, 4 tables, Proceedings for EASTMAG-2010, June 28 - July 2 2010, Ekaterinburg, Russia

Published
2010
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4. Simulation of relativistic shocks and associated radiation

Author

Nishikawa, K. -I., Niemiec, J., Medvedev, M., Zhang, B., Hardee, P., Mizuno, Y., Nordlund, A., Frederiksen, J., Sol, H., Pohl, M., Hartmann, D. H., and Fishman, J. F.

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics - High Energy Astrophysical Phenomena
Abstract

Using our new 3-D relativistic electromagnetic particle (REMP) code parallelized with MPI, we investigated long-term particle acceleration associated with a relativistic electron-positron jet propagating in an unmagnetized ambient electron-positron plasma. We have also performed simulations with electron-ion jets. The simulations were performed using a much longer simulation system than our previous simulations in order to investigate the full nonlinear stage of the Weibel instability for electron-positron jets and its particle acceleration mechanism. Cold jet electrons are thermalized and ambient electrons are accelerated in the resulting shocks for both cases. Acceleration of ambient electrons leads to a maximum ambient electron density three times larger than the original value for pair plasmas. Behind the bow shock in the jet shock strong electromagnetic fields are generated. These fields may lead to time dependent afterglow emission. We calculated radiation from electrons propagating in a uniform parallel magnetic field to verify the technique. We also used the new technique to calculate emission from electrons based on simulations with a small system with two different cases for Lorentz factors (15 and 100). We obtained spectra which are consistent with those generated from electrons propagating in turbulent magnetic fields with red noise. This turbulent magnetic field is similar to the magnetic field generated at an early nonlinear stage of the Weibel instability., Comment: submitted to 2009 Fermi Symposium and eConf Proceedings C091122

Published
2009
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5. Atmospheric Consequences of Cosmic Ray Variability in the Extragalactic Shock Model II: Revised ionization levels and their consequences

Author

Melott, A. L., Atri, D., Thomas, B. C., Medvedev, M. V., Wilson, G. W., and Murray, M. J.

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), Populations and Evolution (q-bio.PE), FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Geophysics (physics.geo-ph), Physics - Geophysics, High Energy Physics - Phenomenology, Physics - Atmospheric and Oceanic Physics, High Energy Physics - Phenomenology (hep-ph), FOS: Biological sciences, Atmospheric and Oceanic Physics (physics.ao-ph), Quantitative Biology - Populations and Evolution, Astrophysics::Galaxy Astrophysics
Abstract

It has been suggested that galactic shock asymmetry induced by our galaxy's infall toward the Virgo Cluster may be a source of periodicity in cosmic ray exposure as the solar system oscillates perpendicular to the galactic plane. Here we investigate a mechanism by which cosmic rays might affect terrestrial biodiversity, ionization and dissociation in the atmosphere, resulting in depletion of ozone and a resulting increase in the dangerous solar UVB flux on the ground, with an improved ionization background computation averaged over a massive ensemble (about 7 x 10^5) shower simulations. We study minimal and full exposure to the postulated extragalactic background. The atmospheric effects are greater than with our earlier, simplified ionization model. At the lower end of the range effects are too small to be of serious consequence. At the upper end of the range, ~6 % global average loss of ozone column density exceeds that currently experienced due to effects such as accumulated chlorofluorocarbons. The intensity is less than a nearby supernova or galactic gamma-ray burst, but the duration would be about 10^6 times longer. Present UVB enhancement from current ozone depletion ~3% is a documented stress on the biosphere, but a depletion of the magnitude found at the upper end of our range would double the global average UVB flux. For estimates at the upper end of the range of the cosmic ray variability over geologic time, the mechanism of atmospheric ozone depletion may provide a major biological stress, which could easily bring about major loss of biodiversity. Future high energy astrophysical observations will resolve the question of whether such depletion is likely., Comment: 22 pages, 5 figures, to be published in Journal of Geophysical Research--Planets. This is an update and replacement for our 2008 paper, with a much more extensive simulation of air shower ionization. Ionization effects and ozone depletion are somewhat larger

Published
2008
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6. Ab initio exchange interactions and magnetic properties of Gd2Fe17 iron sublattice: rhombohedral vs. hexagonal phases

Author

Lukoyanov, A. V., Kokorina, E. E., Medvedev, M. V., and Nekrasov, I. A.

Subjects
Condensed Matter - Strongly Correlated Electrons, Condensed Matter::Materials Science, Strongly Correlated Electrons (cond-mat.str-el), FOS: Physical sciences, Condensed Matter::Strongly Correlated Electrons
Abstract

In the framework of the LSDA+U method electronic structure and magnetic properties of the intermetallic compound Gd2Fe17 for both rhombohedral and hexagonal phases have been calculated. On top of that, ab initio exchange interaction parameters within the Fe sublattice for all present nearest and some next nearest Fe ions have been obtained. It was found that for the first coordination sphere direct exchange interaction is ferromagnetic. For the second coordination sphere indirect exchange interaction is observed to be weaker and of antiferromagnetic type. Employing the theoretical values of exchange parameters Curie temperatures Tc of both hexagonal and rhombohedral phases of Gd2Fe17 within Weiss mean-field theory were estimated. Obtained values of Tc and its increase going from the hexagonal to rhombohedral crystal structure of Gd2Fe17 agree well with experiment. Also for both structures LSDA+U computed values of total magnetic moment coincide with experimental ones., Comment: 20 pages, 2 figures; V2 as published in PRB

Published
2008
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7. Thermodynamics of photons in relativistic $e^+e^-��$ plasmas

Author

Medvedev, M. V.

Subjects
Plasma Physics (physics.plasm-ph), Statistical Mechanics (cond-mat.stat-mech), Physics::Plasma Physics, Astrophysics::High Energy Astrophysical Phenomena, Physics::Space Physics, Astrophysics (astro-ph), FOS: Physical sciences
Abstract

Thermodynamic and spectral properties of a photon gas in $e^+e^-��$ plasmas are studied. The effect of a finite effective mass of a photon, associated with the plasma frequency cutoff, is self-consistently included. In the ultra-relativistic plasma, the photon spectrum turns out to be universal with the temperature normalized plasma frequency cutoff being a fundamental constant independent of plasma parameters. Such a universality does not hold in the non-relativistic plasma., 4 pages (REVTeX) with one EPS figure. Submitted to Phys. Rev. E

Published
1999
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8. The Photino Induced Distortion of the CMBR Blackbody Spectrum

Author

Medvedev, M. V.

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Astrophysics (astro-ph), FOS: Physical sciences, Astrophysics
Abstract

It is shown that photon--photino inter-conversions (if exist) may result in a detectable CMBR spectrum distortion which amplitude depends on photino properties, such as its mass. An upper bound on the distortion parameter determined from the recent COBE-FIRAS data, hence, sets a lower bound on the photino mass, $m_{\tilde\gamma} \gtrsim 300 eV$., Comment: 4 pages (REVTeX), 1 PostScript figure

Published
1998
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9. Poster Session 1

Author

A. Deshmukh, S. S. Sharma, F. G. Gobal, S. S. Singla, P. H. Hebbar, H. P. Paydak, M. Igarashi, H. Tada, Y. Sekiguchi, H. Yamasaki, K. Kuroki, T. Machino, K. Yoshida, K. Aonuma, J. Shavadia, H. Otieno, G. Yonga, A. Jinah, J. F. Qvist, P. H. Soerensen, U. Dixen, M. A. Ramirez-Marrero, B. Perez-Villardon, D. Gaitan-Roman, M. Jimenez-Navarro, J. L. Delgado-Prieto, E. De Teresa-Galvan, M. De Mora-Martin, P. B. Hebbar, W. X. Wei, S. Bardari, M. Zecchin, R. Salame', L. Vitali Serdoz, A. Di Lenarda, N. Guerrini, G. Barbati, G. Sinagra, K. Hanazawa, K. Kaitani, Y. Nakagawa, I. Lenaerts, R. Driesen, N. Hermida, H. Heidbuchel, S. Janssens, J. L. Balligand, K. R. Sipido, R. Willems, R. Sehra, D. Krummen, C. Briggs, S. Narayan, Y. Tanaka, K. Hirao, T. Nakamura, O. Inaba, A. Yagishita, K. Higuchi, H. Hachiya, M. Isobe, E. Kallergis, E. M. Kanoupakis, H. E. Mavrakis, C. A. Goudis, N. E. Maliaraki, P. E. Vardas, K. Kiuchi, C. Piorkowski, S. Kircher, T. Gaspar, N. Watanabe, A. Bollmann, G. Hindricks, K. Wauters, A. Grosse, S. Raffa, M. Brunelli, J. C. Geller, A. P. Maggioni, L. Gonzini, G. Gussoni, G. Vescovo, M. Gulizia, S. Pirelli, G. Mathieu, G. Di Pasquale, R. Salame, S. Magnani, T. Sakamoto, K. Kumagai, E. Fuke, S. Nishiuchi, T. Hayashi, Y. Miki, S. Naito, S. Oshima, I. E. Hof, E. Vonken, B. K. Velthuis, M. Meine, R. N. W. Hauer, K. P. Loh, J. O. Na, C. U. Choi, E. J. Kim, S. W. Rha, C. G. Park, H. S. Seo, D. J. Oh, H. E. Lim, D. Wichterle, V. Bulkova, M. Fiala, J. Chovancik, J. Simek, P. Peichl, R. Cihak, J. Kautzner, A. Glick, S. Viskin, B. Belhassen, A. Navarrete, F. Conte, A. Ishti, D. Sai, M. Moran, Z. Chitovova, H. Ahmed, K. Mares, J. Skoda, L. Sediva, J. Petru, V. Y. Reddy, P. Neuzil, M. Schmidt, U. Dorwarth, A. Leber, M. Wankerl, J. Krieg, F. Straube, S. Reif, E. Hoffmann, E. Mikhaylov, V. Tikhonenko, D. Lebedev, S. Y. Shin, H. S. Yong, J. I. Choi, S. H. Kim, S. Matsuo, T. Yamane, M. Hioki, K. Ito, R. Narui, T. Date, K. Sugimoto, M. Yoshimura, S. Rolf, P. Sommer, R. Batalov, S. Popov, I. Antonchenko, T. Suslova, S. Fichtner, U. Czudnochowsky, H. L. Estner, S. Ammar, T. Reents, C. Jilek, G. Hessling, I. Deisenhofer, E. Pokushalov, A. Romanov, G. Corbucci, S. Artemenko, D. Losik, V. Shabanov, A. Turov, D. Elesin, M. Abramov, P. Sanders, P. Jais, K. Roberts-Thomson, K. Fukumoto, S. Takatsuki, T. Kimura, N. Nishiyama, Y. Aizawa, T. Sato, S. Miyoshi, K. Fukuda, Y. Roux, J. Tenkorang, P. Carroz, J. Schlaepfer, P. Pascale, A. Forclaz, M. Fromer, E. Pruvot, L. Sknouril, R. Nevralova, M. Dorda, J. Januska, R. Santi, C. Geller, K. Nakamura, K. Kasseno, K. Taniguchi, A. Wutzler, M. Huemer, A. Parwani, L. H. Boldt, D. Blaschke, R. Dietz, W. Haverkamp, B. Coutu, R. Malanuk, M. Ait Said, A. Vicentini, S. Schade, K. Ando, A. Rousseauplasse, T. Deering, B. C. Picarra, A. R. Santos, P. Dionisio, P. Semedo, R. Matos, M. Leitao, A. Jacinto, M. Trinca, C. Wan, J. Glad, S. Szymkiewicz, M. Habibovic, H. Versteeg, A. J. M. Pelle, D. A. M. J. Theuns, L. Jordaens, S. S. Pedersen, S. Pakarinen, L. Toivonen, J. Taggeselle, A. Frey, A. Birkenhagen, S. Kohler, S. K. G. Maier, N. Lobitz, S. Paule, J. Becher, G. Mustafa, A. Ibrahim, G. King, B. Foley, B. Wilkoff, R. Freedman, D. Hayes, S. Kalbfleisch, S. Kutalek, R. Schaerf, I. A. Fazal, M. Tynan, C. J. Plummer, J. M. Mccomb, A. Oto, K. Aytemir, H. Yorgun, U. Canpolat, E. B. Kaya, L. Tokgozoglu, G. Kabakci, H. Ozkutlu, S. Greenberg, F. Hamati, R. Styperek, J. Alonso, D. Peress, O. Bolanos, R. Augostini, M. Pelini, S. Zhang, S. Stoycos, S. Witsaman, K. Mowrey, J. Bremer, A. Oza, G. Ciconte, P. Mazzone, G. Paglino, A. Marzi, P. Vergara, N. Sora, S. Gulletta, P. Della Bella, M. Nagashima, M. Goya, Y. Soga, K. Hiroshima, K. Andou, K. Hayashi, Y. An, M. Nobuyoshi, A. Kutarski, B. Malecka, R. Pietura, P. Osmancik, D. Herman, P. Stros, V. Kocka, P. Tousek, H. Linkova, M. Bortnik, E. Occhetta, G. Dell'era, A. Degiovanni, L. Plebani, P. N. Marino, M. V. Gorev, D. G. Alimov, P. Raju, S. Kully, S. Ugni, S. Furniss, G. Lloyd, N. R. Patel, M. W. Richards, C. E. Warren, M. H. Anderson, M. Hero, J. L. Rey, S. Ouali, S. Azzez, S. Kacem, S. Hammas, H. Ben Salem, E. Neffeti, F. Remedi, E. Boughzela, M. B. Kronborg, P. T. Mortensen, S. H. Poulsen, J. C. Nielsen, E. N. Simantirakis, J. E. Kontaraki, E. G. Arkolaki, S. I. Chrysostomakis, E. G. Nyktari, A. P. Patrianakos, R. C. Funck, C. Harink, H. H. Mueller, S. Koelsch, B. Maisch, V. Bolzani, P. Costandi, R. E. Shehada, N. Butala, B. Coppola, M. Taborsky, P. Heinc, M. Fedorco, V. Doupal, A. Di Cori, G. Zucchelli, E. Soldati, L. Segreti, R. De Lucia, S. Viani, L. Paperini, M. G. Bongiorni, K. J. Gutleben, W. Kranig, C. Barr, M. M. Morgenstern, M. Simon, Y. H. Dalal, M. Landolina, A. Pierantozzi, T. Agricola, M. Lunati, E. Pisano', G. Lonardi, G. Bardelli, G. Zucchi, B. Thibault, M. Dubuc, E. Karst, K. Ryu, P. Paiement, M. D. Carlson, T. Farazi, H. Alhous, L. Mont, J. M. Porres, J. Alzueta, X. Beiras, I. Fernandez-Lozano, A. Macias, R. Ruiz, J. Brugada, S. M. Viani, M. Seifert, T. Schau, V. Moeller, J. Meyhoefer, C. Butter, V. Ganiere, V. Niculescu, G. Domenichini, C. Stettler, P. Defaye, H. Burri, M. Stockburger, E. De Teresa, G. Lamas, M. Desaga, C. Koenig, E. Cobo, X. Navarro, U. Wiegand, M. Blich, S. Carasso, M. Suleiman, I. Marai, L. Gepstein, M. Boulos, M. Sasov, B. Liska, P. Margitfalvi, T. Malacky, M. Svetlosak, E. Goncalvesova, R. Hatala, Y. Takaya, T. Noda, Y. Yamada, H. Okamura, K. Satomi, W. Shimizu, N. Aihara, S. Kamakura, A. Proclemer, S. Boveda, H. Oswald, P. Scipione, A. Da Costa, W. Brzozowski, A. Tomaszewski, A. Wysokinski, E. Arbelo, D. Tamborero, B. Vidal, J. M. Tolosana, M. Sitges, M. Matas, G. L. Botto, C. D. Dicandia, M. Mantica, C. La Rosa, A. D' Onofrio, G. Molon, G. Raciti, R. Verlato, P. W. X. Foley, S. Chalil, K. Ratib, R. E. A. Smith, F. Printzen, A. Auricchio, F. Leyva, R. Abu Sham'a, J. Buber, D. Luria, R. Kuperstein, M. Feinberg, H. Granit, M. Eldar, M. Glikson, K. Vondrak, E. Nof, I. Lipchenca, R.- G. Vatasescu, C. Iorgulescu, C. Caldararu, A. Vasile, S. Bogdan, D. Constantinescu, M. Dorobantu, H. Sakaguchi, A. Miyazaki, T. Yamamoto, K. Fujimoto, S. Ono, H. Ohuchi, M. Martinelli, S. Martins, R. Molina, S. Siqueira, S. A. D. Nishioka, G. L. Peixoto, R. Alkmim-Teixeira, R. Costa, M. M. Meine, A. E. Tuinenburg, P. A. Doevendans, J. Denollet, K. Goscinska-Bis, I. Zupan, H. Van Der, F. Anselme, H. Hartog, M. Block, A. Borri, L. Padeletti, M. Toniolo, G. Zanotto, A. Rossi, E. Raytcheva, L. Tomasi, C. Vassanelli, I. Fernandez Lozano, C. Mitroi, J. Toquero Ramos, V. Castro Urda, V. Monivas Palomero, A. Corona Figueroa, L. Ruiz Bautista, L. Alonso Pulpon, A. S. Jadidi, F. Sacher, A. S. Shah, D. Scherr, N. Derval, M. Hocini, M. Haissaguerre, S. Castrejon Castrejon, C. Largo-Aramburu, J. Sachar, E. Gang, A. Estrada, D. Doiny, E. De Miguel, J. L. Merino, N. Trevisi, A. Ricco, F. Petracca, F. Baratto, A. Bisceglie, G. Maccabelli, A. El-Damaty, J. Sapp, J. Warren, P. Macinnis, M. Horacek, B. Dinov, R. Schoenbauer, F. Braunschweig, A. Arya, D. Andreu, A. Berruezo, J. T. Ortiz, E. Silva, T. M. De Caralt, J. Fernandez-Armenta, A. Perez-Silva, M. Ortega, J. L. Lopez-Sendon, F. Regoli, F. Faletra, G. Nucifora, E. Pasotti, T. Moccetti, C. Klersy, M. Casella, A. Dello Russo, M. Moltrasio, M. Zucchetti, G. Fassini, L. Di Biase, A. Natale, C. Tondo, N. Matsuhashi, H. J. Weig, G. Kerst, S. Weretk, P. Seizer, M. P. Gawaz, J. Schreieck, G. Sarquella-Brugada, F. Prada, C. M. Salling, C. Kolb, M. Pytkowski, A. Maciag, M. Farkowski, A. Jankowska, I. Kowalik, A. Kraska, H. Szwed, P. Maury, A. Duparc, P. Mondoly, A. Rollin, R. Pap, M. Kohari, G. Bencsik, A. Makai, L. Saghy, T. Forster, E. Ebrille, M. Scaglione, C. Raimondo, D. Caponi, P. Di Donna, A. Blandino, S. D. L. Delcre, F. Gaita, I. Roca Luque, L. D. S. Dos, N. R. G. Rivas, A. P. D. Pijuan, J. Perez, J. Casaldaliga, D. G. D. Garcia-Dorado, A. M. M. Moya, H. Sato, T. Yagi, T. Yambe, F. Streitner, C. Dietrich, E. Mahl, N. Schoene, C. Veltmann, M. Borggrefe, J. Kuschyk, P. P. Sadarmin, K. C. K. Wong, K. Rajappan, Y. Bashir, T. R. Betts, C. Leclercq, R. Martins, J. C. Daubert, P. Mabo, M. Koide, G. Hamano, T. Taniguchi, M. Yamato, N. Sasaki, K. Hirooka, Y. Ikeda, Y. Yasumura, W. Dichtl, T. Wolber, U. Paoli, S. Bruellmann, T. Berger, M. Stuehlinger, F. Duru, F. Hintringer, E. Kanoupakis, H. Mavrakis, E. Koutalas, I. Saloustros, C. Goudis, G. Chlouverakis, P. Vardas, J. M. Herre, M. Saeed, L. Saberi, S. Neuman, K. Yamaji, M. Iwabuchi, A. Baranchuk, F. Femenia, R. Miranda Hermosilla, J. C. Lopez Diez, J. L. Serra, M. Valentino, E. Retyk, N. Galizio, W. Kwasniewski, A. Filipecki, W. Orszulak, D. Urbanczyk-Swic, M. Trusz - Gluza, O. Piot, B. Degand, A. Donofrio, P. Scanu, A. Quesada, A. Kloppe, D. Mijic, H. Bogossian, M. Zarse, B. Lemke, J. Tyler, G. Comfort, T. F. Deering, A. E. Epstein, S. M. G. Greenberg, D. S. Goldman, J. Rhude, J. P. Majewski, J. Lelakowski, I. Tomala, C. M. Santos, R. S. Miranda, P. J. Sousa, D. M. Cavaco, P. P. Adragao, R. E. Knops, A. A. Wilde, M. Belhameche, J. S. Hermida, E. Dovellini, G. Frohlig, P. Siot, G. Z. Duray, C. W. Israel, J. Brachmann, K. H. Seidl, M. Foresti, F. Birkenhauer, S. H. Hohnloser, C. Ferreira, P. Mateus, H. Ribeiro, S. Carvalho, A. Ferreira, J. Moreira, W. Kadro, H. Rahim, M. Turkmani, M. Abu Lebdeh, A. Altabban, N. Cerrato, S. Rivera, F. Scazzuso, G. Albina, A. Klein, R. Laino, V. Sammartino, A. Giniger, T. Kvantaliani, M. Akhvlediani, M. Namdar, J. Steffel, S. Jetzer, F. Bayrak, G. B. Chierchia, R. Jenni, P. Brugada, Z. Bakos, M. M. Medvedev M, J. C. Jonas Carlsson, F. H. Fredrik Holmqvist, P. P. Pyotr Platonov, T. Nurbaev, M. Pirnazarov, A. Nikishin, P. Aagaard, A. Sahlen, L. Bergfeldt, E. Simeonidou, S. Kastellanos, C. Varounis, C. Michalakeas, C. Koniari, A. Nikolopoulou, M. Anastasiou-Nana, Y. Furukawa, T. Yamada, T. Morita, K. Tanaka, Y. Iwasaki, M. Kawasaki, Y. Kuramoto, M. Fukunami, C. Blanche, N. 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Subjects
Lv function, medicine.medical_specialty, business.industry, Physiology (medical), Internal medicine, Cardiology, Medicine, Cardiology and Cardiovascular Medicine, business, Predictive value, Value (mathematics), Surgery
Abstract

was higher in the NRG (p 0.70 was the more accurate RT-MCE value to predict LV regional recovery with positive predictive value of 70% and negative predictive value of 56% (p

Published
2011

42. Well placement helps to manage large structural uncertainty while drilling a horizontal well in S Nurzhanov field, show case from Kazakhstan

Author

Adilbekov, K., Kozov, K., Mukanov, E., Chzhen, I., Karychev, Y., Nevzorov, R., Aman Makhambetov, Ospanov, D., Shozhikov, D., Lukpanov, A., Medvedev, M., and Alexeev, K.

Abstract

When drilling horizontal wells, geological uncertainties have a much greater effect on the fulfillment of geological tasks than when drilling vertical wells. The combination of the classic geosteering methodology, complemented using logging while drilling (LWD) technologies, and rotary steerable systems, allows you to quickly make decisions on changing the well trajectory to optimize the entry into the target formation. During subsequent drilling within the target formation, the use of multilayer mapping technology in conjunction with an extended LWD and RSS system - helps to more accurately adjust the position of the horizontal section in the reservoir, thereby increasing the rate of reservoir penetration This article describes the effectiveness of the geosteering service to reduce structural uncertainties of landing of the transport section and while placing a horizontal section in the productive part of the S. Nurzhanov field. Structural uncertainties were mainly caused by the proximity of the regional fault to the horizontal section and the variability in the thickness of the target intervals in the offset wells. The provided geosteering service made it possible to complete all the tasks set for drilling the horizontal section, preventing the exit from going beyond the target zone and avoiding the unwanted approach of the wellbore to the unproductive rocks lying within its boundaries.

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