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149 results on '"Marinova, I"'

2. The HST/ACS Coma Cluster Survey: VII - Colour Gradients in Giant and Dwarf Early-Type Galaxies

Author

Brok, M. den, Peletier, R. F., Valentyn, E. A., Balcells, M., Carter, D., Erwin, P., Ferguson, H. C., Goudfrooij, P., Graham, A. W., Hammer, D., Lucey, J. R., Trentham, N., Guzman, R., Hoyos, C., Kleijn, G. Verdoes, Jogee, S., Karick, A. M., Marinova, I., Mouhcine, M., and Weinzirl, T.

Subjects
Astrophysics - Astrophysics of Galaxies
Abstract

Using deep, high-spatial resolution imaging from the HST ACS Coma Cluster Treasury Survey, we determine colour profiles of early-type galaxies in the Coma cluster. From 176 galaxies brighter than $M_\mathrm{F814W(AB)} = -15$ mag that are either spectroscopically confirmed members of Coma or identified by eye as likely members from their low surface brightness, data are provided for 142 early-type galaxies. Typically, colour profiles are linear against $\log(R)$, sometimes with a nuclear region of distinct, often bluer colour associated with nuclear clusters. Colour gradients are determined for the regions outside the nuclear components. We find that almost all colour gradients are negative, both for elliptical and lenticular galaxies. Most likely, earlier studies that report positive colour gradients in dwarf galaxies are affected by the bluer colours of the nuclear clusters, underlining that high resolution data are essential to disentangle the colour properties of the different morphological components in galaxies. Colour gradients of dwarf galaxies form a continuous sequence with those of elliptical galaxies, becoming shallower toward fainter magnitudes. Interpreting the colours as metallicity tracers, our data suggest that dwarfs as well as giant early-type galaxies in the Coma cluster are less metal rich in their outer parts. We do not find evidence for environmental influence on the gradients, although we note that most of our galaxies are found in the central regions of the cluster. For a subset of galaxies with known morphological types, S0 galaxies have less steep gradients than elliptical galaxies., Comment: 23 pages, 15 figures. Accepted for publication in MNRAS. Online material available at http://astronomy.swin.edu.au/coma/publications.htm

Published
2011
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3. Barred disks in dense environments

Author

Marinova, I., Jogee, S., Heiderman, A., Barazza, F. D., Gray, M. E., Barden, M., Wolf, C., Peng, C. Y., Bacon, D., Balogh, M., Bell, E. F., Bohm, A., Caldwell, J. A. R., Haussler, B., Heymans, C., Jahnke, K., van Kampen, E., Koposov, S., Lane, K., McIntosh, D. H., Meisenheimer, K., Rix, H. -W., Sanchez, S. F., Taylor, A., Wisotzki, L., and Zheng, X.

Subjects
Astrophysics - Cosmology and Extragalactic Astrophysics
Abstract

We investigate the properties of bright (MV <= -18) barred and unbarred disks in the Abell 901/902 cluster system at z~0.165 with the STAGES HST ACS survey. To identify and characterize bars, we use ellipse-fitting. We use visual classification, a Sersic cut, and a color cut to select disk galaxies, and find that the latter two methods miss 31% and 51%, respectively of disk galaxies identified through visual classification. This underscores the importance of carefully selecting the disk sample in cluster environments. However, we find that the global optical bar fraction in the clusters is ~30% regardless of the method of disk selection. We study the relationship of the optical bar fraction to host galaxy properties, and find that the optical bar fraction depends strongly on the luminosity of the galaxy and whether it hosts a prominent bulge or is bulgeless. Within a given absolute magnitude bin, the optical bar fraction increases for galaxies with no significant bulge component. Within each morphological type bin, the optical bar fraction increases for brighter galaxies. We find no strong trend (variations larger than a factor of 1.3) for the optical bar fraction with local density within the cluster between the core and virial radius (R ~ 0.25 to 1.2 Mpc). We discuss the implications of our results for the evolution of bars and disks in dense environments., Comment: 7 pages, 2 figures; To appear in "Tumbling, twisting, and winding galaxies: Pattern speeds along the Hubble sequence", E. M. Corsini and V. P. Debattista (eds.), Memorie della Societa` Astronomica Italiana

Published
2010

4. Relating basic properties of bright early-type dwarf galaxies to their location in Abell 901/902

Author

Barazza, F. D., Wolf, C., Gray, M. E., Jogee, S., Balogh, M., McIntosh, D. H., Bacon, D., Barden, M., Bell, E. F., Boehm, A., Caldwell, J. A. R., Haeussler, B., Heiderman, A., Heymans, C., van Kampen, K. Jahnke. E., Lane, K., Marinova, I., Meisenheimer, K., Peng, C. Y., Sanchez, S. F., Taylor, A., Wisotzki, L., and Zheng, X.

Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We present a study of the population of bright early-type dwarf galaxies in the multiple-cluster system Abell 901/902. We use data from the STAGES survey and COMBO-17 to investigate the relation between the color and structural properties of the dwarfs and their location in the cluster. The definition of the dwarf sample is based on the central surface brightness and includes galaxies in the luminosity range -16 >= M_B >~-19 mag. Using a fit to the color magnitude relation of the dwarfs, our sample is divided into a red and blue subsample. We find a color-density relation in the projected radial distribution of the dwarf sample: at the same luminosity dwarfs with redder colors are located closer to the cluster centers than their bluer counterparts. Furthermore, the redder dwarfs are on average more compact and rounder than the bluer dwarfs. These findings are consistent with theoretical expectations assuming that bright early-type dwarfs are the remnants of transformed late-type disk galaxies involving processes such as ram pressure stripping and galaxy harassment. This indicates that a considerable fraction of dwarf elliptical galaxies in clusters are the results of transformation processes related to interactions with their host cluster., Comment: 12 pages, 8 figures, accepted for publication in A&A, typo corrected in abstract

Published
2009
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5. Interacting Galaxies in the A901/902 Supercluster with STAGES

Author

Heiderman, A. L., Jogee, S., Marinova, I., van Kampen, E., Barden, M., Peng, C. Y., Heymans, C., Gray, M. E., Bell, E. F., Bacon, D., Balogh, M., Barazza, F. D., Bohm, A., Caldwell, J. A. R., Haussler, B., Jahnke, K., Lane, K., McIntosh, D. H., Meisenheimer, K., Sanchez, S. F., Somerville, R., Taylor, A. N., Wisotzki, L., Wolf, C., and Zheng, X.

Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We present a study of galaxy mergers and the influence of environment in the Abell 901/902 supercluster at z~0.165. We use HST ACS F606W data from the STAGES survey, COMBO-17, Spitzer 24um, and XMM-Newton X-ray data. Our analysis utilizes both a visual classification system, and quantitative CAS parameters to identify systems which show evidence of a recent or ongoing merger of mass ratio >1/10. Our results are: (1) After visual classification and minimizing the contamination from false projection pairs, we find that the merger fraction f_merge is 0.023+/-0.007. The estimated fractions of likely major mergers, likely minor mergers, and ambiguous cases are 0.01+/-0.004, 0.006+/-0.003, and 0.007+/-0.003, respectively. (2) The mergers lie outside the cluster core of radius R < 0.25 Mpc: the lack of mergers in the core is likely due to the large galaxy velocity dispersion in the core. Mergers populate the region (0.25 Mpc < R <= 2 Mpc) between the core and outskirt. In this region, the estimated frequency of mergers is similar to those seen at typical group overdensities. This suggests ongoing growth of the clusters via accretion of group and field galaxies. (3) We compare our observed merger fraction with those reported in other clusters and groups out to z~0.4. Existing data points on the merger fraction for L<= L* galaxies in clusters allow for a range of evolutionary scenarios. (4) The fraction of mergers, which lie on the blue cloud is 80%+/-18% versus 34%+/-7% for non-interacting galaxies, implying that interacting galaxies are preferentially blue. (5) The average SFR, based on UV or UV+IR data, is enhanced by a factor of ~1.5 to 2 in mergers compared to non-interacting galaxies. However, mergers in the clusters contribute only a small fraction (between 10% and 15%) of the total SFR density.(Abridged), Comment: Accepted for publication in ApJ. 34 pages, 16 figures. Version with full resolution figures available at: http://www.as.utexas.edu/~alh/apj/int/ ; updated abridged abstract

Published
2009
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6. Barred Galaxies in the Abell 901/2 Supercluster with STAGES

Author

Marinova, I., Jogee, S., Heiderman, A., Barazza, F. D., Gray, M. E., Barden, M., Wolf, C., Peng, C. Y., Bacon, D., Balogh, M., Bell, E. F., Bohm, A., Caldwell, J. A. R., Haussler, B., Heymans, C., Jahnke, K., van Kampen, E., Koposov, S., Lane, K., McIntosh, D. H., Meisenheimer, K., Rix, H. -W., Sanchez, S. F., Taylor, A., Wisotzki, L., and Zheng, X.

Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Astrophysics of Galaxies
Abstract

We present a study of bar and host disk evolution in a dense cluster environment, based on a sample of ~800 bright (MV <= -18) galaxies in the Abell 901/2 supercluster at z~0.165. We use HST ACS F606W imaging from the STAGES survey, and data from Spitzer, XMM-Newton, and COMBO-17. We identify and characterize bars through ellipse-fitting, and other morphological features through visual classification. (1) We explore three commonly used methods for selecting disk galaxies. We find 625, 485, and 353 disk galaxies, respectively, via visual classification, a single component S'ersic cut (n <= 2.5), and a blue-cloud cut. In cluster environments, the latter two methods miss 31% and 51%, respectively, of visually-identified disks. (2) For moderately inclined disks, the three methods of disk selection yield a similar global optical bar fraction (f_bar-opt) of 34% +10%/-3%, 31% +10%/-3%, and 30% +10%/-3%, respectively. (3) f_bar-opt rises in brighter galaxies and those which appear to have no significant bulge component. Within a given absolute magnitude bin, f_bar-opt is higher in visually-selected disk galaxies that have no bulge as opposed to those with bulges. For a given morphological class, f_bar-opt rises at higher luminosities. (4) For bright early-types, as well as faint late-type systems with no evident bulge, the optical bar fraction in the Abell 901/2 clusters is comparable within a factor of 1.1 to 1.4 to that of field galaxies at lower redshifts (5) Between the core and the virial radius of the cluster at intermediate environmental densities, the optical bar fraction does not appear to depend strongly on the local environment density and varies at most by a factor of ~1.3. We discuss the implications of our results for the evolution of bars and disks in dense environments., Comment: accepted for publication in ApJ, abstract abridged, for high resolution figures see http://www.as.utexas.edu/~marinova/STAGES/STAGES_bars.pdf

Published
2009
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8. Characterizing Barred Galaxies in the Abell 901/902 Supercluster

Author

Marinova, I., Jogee, S., Bacon, D., Balogh, M., Barden, M., Barazza, F. D., Bell, E. F., Bohm, A., Caldwell, J. A. R., Gray, M. E., Haussler, B., Heymans, C., Jahnke, K., van Kampen, E., Koposov, S., Lane, K., McIntosh, D. H., Meisenheimer, K., Peng, C. Y., Rix, H. -W., Sanchez, S. F., Taylor, A., Wisotzki, L., Wolf, C., and Zheng, X.

Subjects
Astrophysics
Abstract

In dense clusters, higher densities at early epochs as well as physical processes, such as ram pressure stripping and tidal interactions become important, and can have direct consequences for the evolution of bars and their host disks. To study bars and disks as a function of environment, we are using the STAGES ACS HST survey of the Abell 901/902 supercluster (z~0.165), along with earlier field studies based the SDSS and the Ohio State University Bright Spiral Galaxy Survey (OSUBSGS). We explore the limitations of traditional methods for characterizing the bar fraction, and in particular highlight uncertainties in disk galaxy selection in cluster environments. We present an alternative approach for exploring the proportion of bars, and investigate the properties of bars as a function of host galaxy color, Sersic index, stellar mass, star formation rate (SFR), specific SFR, and morphology., Comment: to appear in the ASP conference proceedings of the "Frank N. Bash Symposium 2007: New Horizons in Astronomy", editors: A. Frebel, J. Maund, J. Shen, M. Siegel

Published
2008

10. Vedolizumab versus Adalimumab for Moderate-to-Severe Ulcerative Colitis

Author

Sands BE1, Peyrin-Biroulet L1, Loftus EV Jr1, Danese S1, Colombel JF1, Törüner M1, Jonaitis L1, Abhyankar B1, Chen J1, Rogers R1, Lirio RA1, Bornstein JD1, Schreiber S1, Calvo S, Gimenez E, Resk JH, Tron EP, Al-Ansari M, Andrews J, Bampton P, Debinski H, Hendy P, Holtmann G, Leong R, Moore G, Hindryckx P, Barac T, Draganova R, Kotzev I, Marinova I, Markov M, Mihaylov Y, Pavlov D, Penkova M, Petrov A, Spassova Z, Stoyanova D, Velev E, Vladimirov B, Yanev F, Axler J, Fedorak R, Fowler S Jr, Halder S, Jairath V, Ponich T, Wong K, Baez E, Ricardo J, Velasquez M, Banic M, Bogadi I, Borzan V, Zgrablic JC, Duvnjak M, Gusej M, Krznaric Z, Cechova I, Hala T, Janu L, Kohout P, Lukas M, Machkova M, Matous J, Ulbrych J, Vanasek T, Klinge L, Rannem T, Theede K, Borissova J, Kull K, Amil M, Bouhnik Y, Gilleta C, Fumery M, Grimaud JC, Hebuterne X, Laharie D, Moreau J, Peyrin-Biroulet L, Roblin X, Baumgart D, Buening C, Dinter J, Gauss A, Kuehbacher T, Fareed Rahman K, Schiefke I, Schreiber S, Von Amim U, Zeuzem S, Leung WK, Kin Kong Li M, Altorjay I, Bene L, Lakatos P, Molnar T, Salamon A, Schnabel R, Tulassay Z, Avni Y, Barkay O, Fishman S, Goldin E, Keret D, Lahat-Zok A, Melzer E, Naftali T, Nimer A, Ovadia B, Zittan E, Andriulli A, Cappello M, Castiglione F, Danese S, Fries W, Gionchetti P, Kohn A, Maconi G, Santino M, Savarino E, Privitera A, Romano M, Vecchi M, Villa E, Cheon JH, Han DS, Jang BI, Jeen YT, Kim JS, Kim SK, Kim HJ, Kim Y, Lee KM, Lee BI, Park DI, Park YS, Song GA, Ye BD, Pokrotnieks J, Tolmanis I, Denapiene G, Kancauskas A, Jakovlevaite V, Jonaitis L, Cruz Palacios A, Larriva de Los Reyes E, Asela Lujano Nicolas L, Mendoza Fuerte E, D'Haens G, Pierik M, Van Der Woude J, Adrych K, Danilkiewicz WC, Gawdis-Wojnarska B, Hartleb M, Karczewski M, Kierkus J, Malecka-Panas E, Petryka R, Piotrowski W, Regula J, Romatowski J, Rozciecha J, Rydzewska G, Smolinski P, Walczak P, Walczak M, Wozniak-Stolarska B, Cotter J, Lopes L, Portela F, Rodrigues Carvalho J, Simona Gheorghe L, Goldis AE, Mateescu RB, Abdulkhakov R, Agafyina A, Alexeeva O, Alikhanov B, Bunkova E, Dvorkin M, Gubonina I, Kashnikov V, Livzan M, Osipenko M, Parfenov A, Pershko A, Pesegova M, Rafalskiy V, Reshetko O, Simanenkov V, Tsybulko S, Valuyskikh E, Yakovlev A, Cvetkovic M, Damjanov D, Djuranovic S, Dugalic P, Nagorni A, Svorcan P, Zdravkovic Petrovic N, Bunganic I, Gregus M, Hlavaty T, Horvath F, Domenech Morral E, Jover Martinez R, Mendoza MIV, Shieh MJ, Wei CC, Altintas E, Atug O, Gonen C, Hamzaoglu H, Hulagu S, Toruner M, Chopey I, Danyliuk S, Datsenko O, Golovchenko N, Golovchenko O, Hospodarskyy I, Ivanov V, Klymenko V, Levchenko O, Lizogub V, Mostovoy Y, Oliinyk O, Polianskyi I, Pyrohovskyi V, Shevchuk S, Ursol G, Vdovychenko V, Vyshyvanyuk V, Beales I, Brookes M, Nwokolo C, Winter J, Aggarwal A, Aguilar H, Alnoah Z, Arce-Nunez E, Arimie C, Arterburn J, Baum C, Bellaguarda E, Bock B, Boone T, Callahan N, Chapman J, Chen S, Chiorean M, Coates A, Connor M, Dellon S, Dryden G, Du Vall G, Flores L, Fogel R, Frias J, Ginsburg P, Greenberg E, Grunkemeier D, Hellstern P, Herfarth H, Hoffman B, Horst S, Idarraga S, Iskandar H, Jain R, Jenkins E, Kaufman B, Khaleq A, Khan A, Khurana S, Lake J, Leavitt J, Leman B, Lewis D, Lindenberg D, Loftus EV, Korman L, Martin J, McCullough M, McNair A, Mehta N, Mutlu E, Narayen V, Paoli-Bruno J, Perez N, Phillips R, Raijman I, Ramirez-Vega R, Randall C, Rinesmith S, Ritter T, Safdi A, Saltzman M, Sands B, Seminerio J, Schulman M, Sedghi S, Shafran I, Shankar M, Silvers D, Soloman N, Tatum H, Tepper R, Tiongco F, Valdes M, Weber J, Zhang C., Sands, Be1, Peyrin-Biroulet, L1, Loftus EV, Jr1, Danese, S1, Colombel, Jf1, Törüner, M1, Jonaitis, L1, Abhyankar, B1, Chen, J1, Rogers, R1, Lirio, Ra1, Bornstein, Jd1, Schreiber, S1, Calvo, S, Gimenez, E, Resk, Jh, Tron, Ep, Al-Ansari, M, Andrews, J, Bampton, P, Debinski, H, Hendy, P, Holtmann, G, Leong, R, Moore, G, Hindryckx, P, Barac, T, Draganova, R, Kotzev, I, Marinova, I, Markov, M, Mihaylov, Y, Pavlov, D, Penkova, M, Petrov, A, Spassova, Z, Stoyanova, D, Velev, E, Vladimirov, B, Yanev, F, Axler, J, Fedorak, R, Fowler, S Jr, Halder, S, Jairath, V, Ponich, T, Wong, K, Baez, E, Ricardo, J, Velasquez, M, Banic, M, Bogadi, I, Borzan, V, Zgrablic, Jc, Duvnjak, M, Gusej, M, Krznaric, Z, Cechova, I, Hala, T, Janu, L, Kohout, P, Lukas, M, Machkova, M, Matous, J, Ulbrych, J, Vanasek, T, Klinge, L, Rannem, T, Theede, K, Borissova, J, Kull, K, Amil, M, Bouhnik, Y, Gilleta, C, Fumery, M, Grimaud, Jc, Hebuterne, X, Laharie, D, Moreau, J, Peyrin-Biroulet, L, Roblin, X, Baumgart, D, Buening, C, Dinter, J, Gauss, A, Kuehbacher, T, Fareed Rahman, K, Schiefke, I, Schreiber, S, Von Amim, U, Zeuzem, S, Leung, Wk, Kin Kong Li, M, Altorjay, I, Bene, L, Lakatos, P, Molnar, T, Salamon, A, Schnabel, R, Tulassay, Z, Avni, Y, Barkay, O, Fishman, S, Goldin, E, Keret, D, Lahat-Zok, A, Melzer, E, Naftali, T, Nimer, A, Ovadia, B, Zittan, E, Andriulli, A, Cappello, M, Castiglione, F, Danese, S, Fries, W, Gionchetti, P, Kohn, A, Maconi, G, Santino, M, Savarino, E, Privitera, A, Romano, M, Vecchi, M, Villa, E, Cheon, Jh, Han, D, Jang, Bi, Jeen, Yt, Kim, J, Kim, Sk, Kim, Hj, Kim, Y, Lee, Km, Lee, Bi, Park, Di, Park, Y, Song, Ga, Ye, Bd, Pokrotnieks, J, Tolmanis, I, Denapiene, G, Kancauskas, A, Jakovlevaite, V, Jonaitis, L, Cruz Palacios, A, Larriva de Los Reyes, E, Asela Lujano Nicolas, L, Mendoza Fuerte, E, D'Haens, G, Pierik, M, Van Der Woude, J, Adrych, K, Danilkiewicz, Wc, Gawdis-Wojnarska, B, Hartleb, M, Karczewski, M, Kierkus, J, Malecka-Panas, E, Petryka, R, Piotrowski, W, Regula, J, Romatowski, J, Rozciecha, J, Rydzewska, G, Smolinski, P, Walczak, P, Walczak, M, Wozniak-Stolarska, B, Cotter, J, Lopes, L, Portela, F, Rodrigues Carvalho, J, Simona Gheorghe, L, Goldis, Ae, Mateescu, Rb, Abdulkhakov, R, Agafyina, A, Alexeeva, O, Alikhanov, B, Bunkova, E, Dvorkin, M, Gubonina, I, Kashnikov, V, Livzan, M, Osipenko, M, Parfenov, A, Pershko, A, Pesegova, M, Rafalskiy, V, Reshetko, O, Simanenkov, V, Tsybulko, S, Valuyskikh, E, Yakovlev, A, Cvetkovic, M, Damjanov, D, Djuranovic, S, Dugalic, P, Nagorni, A, Svorcan, P, Zdravkovic Petrovic, N, Bunganic, I, Gregus, M, Hlavaty, T, Horvath, F, Domenech Morral, E, Jover Martinez, R, Mendoza, Miv, Shieh, Mj, Wei, Cc, Altintas, E, Atug, O, Gonen, C, Hamzaoglu, H, Hulagu, S, Toruner, M, Chopey, I, Danyliuk, S, Datsenko, O, Golovchenko, N, Golovchenko, O, Hospodarskyy, I, Ivanov, V, Klymenko, V, Levchenko, O, Lizogub, V, Mostovoy, Y, Oliinyk, O, Polianskyi, I, Pyrohovskyi, V, Shevchuk, S, Ursol, G, Vdovychenko, V, Vyshyvanyuk, V, Beales, I, Brookes, M, Nwokolo, C, Winter, J, Aggarwal, A, Aguilar, H, Alnoah, Z, Arce-Nunez, E, Arimie, C, Arterburn, J, Baum, C, Bellaguarda, E, Bock, B, Boone, T, Callahan, N, Chapman, J, Chen, S, Chiorean, M, Coates, A, Connor, M, Dellon, S, Dryden, G, Du Vall, G, Flores, L, Fogel, R, Frias, J, Ginsburg, P, Greenberg, E, Grunkemeier, D, Hellstern, P, Herfarth, H, Hoffman, B, Horst, S, Idarraga, S, Iskandar, H, Jain, R, Jenkins, E, Kaufman, B, Khaleq, A, Khan, A, Khurana, S, Lake, J, Leavitt, J, Leman, B, Lewis, D, Lindenberg, D, Loftus, Ev, Korman, L, Martin, J, Mccullough, M, Mcnair, A, Mehta, N, Mutlu, E, Narayen, V, Paoli-Bruno, J, Perez, N, Phillips, R, Raijman, I, Ramirez-Vega, R, Randall, C, Rinesmith, S, Ritter, T, Safdi, A, Saltzman, M, Sands, B, Seminerio, J, Schulman, M, Sedghi, S, Shafran, I, Shankar, M, Silvers, D, Soloman, N, Tatum, H, Tepper, R, Tiongco, F, Valdes, M, Weber, J, and Zhang, C.

Published
2019

12. Dynamics on ferroresonant circuit exhibiting chaotic phenomenon

Author

Endo, H., Marinova, I., Takagi, S., Hayano, S., and Saito, Y.

Subjects
Electromagnetism -- Research, Business, Electronics, Electronics and electrical industries
Abstract

This paper studies dynamics of a series ferroresonant circuit. A Chua type magnetization model derives a state variable equation with nonlinear parameters. Backward Euler method with adaptive stepsize control performs a transient analysis. Modal analysis to the state variable equation is also carried out in each calculation period of the Euler method in order to obtain the condition of internal system. Finally, it is clarified that the characteristic values vary on the regular loci although the chaotic phenomenon is exhibiting. The relation between the time constants and operating frequencies is shown to clarify the ferroresonant mode. Index Terms--Chaotic phenomenon, Chua-type magnetization model, modal analysis, series ferroresonant circuit.

Published
2004

15. Ustekinumab as Induction and Maintenance Therapy for Ulcerative Colitis

Author

Sands, B. E., Sandborn, W. J., Panaccione, R., O'Brien, C. D., Zhang, H., Johanns, J., Adedokun, O. J., Li, K., Peyrin-Biroulet, L., Van Assche, G., Danese, S., Targan, S., Abreu, M. T., Hisamatsu, T., Szapary, P., Brown S, Marano C., Connor, S, De Cruz, P, Ding, Nj, Florin, T, Hendy, P, Leong, R, Moore, G, Pavli, P, Sparrow, M, Gassner, S, Vogelsang, H, Baert, F, Colard, A, De Vos, M, D'Heygere, F, Ferrante, M, Louis, E, Staessen, D, Berova, T, Churchev, J, Draganova, R, Gancheva, D, Ivanova, N, Marinova, I, Markov, M, Nikolov, R, Tsonev, N, Vassileva, G, Afif, W, Berstein, C, Bressler, B, Jairath, V, Lachance, Jr, Singh, R, Tilbe, K, Komarek, V, Kozeluhova, J, Lukas, M, Volfova, M, Dahlerup, J, Altwegg, R, Beorchia, S, Bouguen, G, Cadiot, G, Dupas, Jl, Desreumaux, P, Flourie, B, Grimaud, Jc, Guillaud, O, Moreau, J, Roblin, X, Zerbib, F, Baumgart, D, Beckebaum, S, Bokemeyer, B, Ebert, M, Hasselblatt, P, Lügering, A, Maaser, C, Schiefke, I, Schreiber, S, Seidler, U, Altorjay, I, Kiss, Gg, Literati-Nagy, B, Patai, A, Pecsi, G, Salamon, A, Schnabel, R, Székely, A, Tulassay, Z, Varga, M, Fich, A, Fishman, S, Konikoff, F, Lichtenstein, L, Rainis, T, Sbeit, W, Schwartz, D, Annese, V, Biancone, L, Bossa, F, Costintino, R, Danese, S, Fries, W, Gasbarrini, A, Guidi, L, Kohn, A, Maconi, G, Rocca, R, Rogai, F, Villa, E, Zoli, G, Akiho, H, Aoyama, N, Arisawa, T, Hidaka, H, Hisamatsu, T, Horiki, N, Inaba, T, Inoue, S, Ishida, T, Ishida, H, Ishiguro, Y, Ishihara, S, Iwabuchi, M, Kato, J, Katsushima, S, Kobayashi, T, Kojima, Y, Kurihara, H, Masuo, T, Matsui, T, Matsumoto, T, Matsuoka, K, Mitsuyama, K, Motoya, S, Nakagawa, T, Nakai, K, Nakamura, S, Niihara, T, Ohnishi, Y, Ohta, A, Osada, T, Ryuichi, I, Sakai, Y, Sakata, Y, Sameshima, Y, Sano, K, Shibatoge, M, Shibuya, T, Suzuki, Y, Takeshima, F, Tanaka, S, Taruishi, M, Tokito, S, Ueo, T, Watanabe, K, Yamagami, H, Cheon, Jh, Cho, Kb, Knowles, Kim, Kim, Hj, Kim, Y, Lee, Km, Yang, Sk, D'Haens, G, Pierik, M, Gearry, R, Inns, S, Rowbotham, D, Schultz, M, Bochenek, A, Gawdis-Wojnarska, B, Kleczkowski, D, Leszczyszyn, J, Malecka-Panas, E, Mamos, A, Petryka, R, Regula, J, Rozciecha, J, Stefanuik, P, Wozniak-Stolarska, B, Cimpoeru, N, Craciun, E, Ovidiu, Cf, Goldis, E, Ionita-Radu, F, Lazar, D, Suciu, I, Abdulkhakov, R, Alikhanov, B, Apartsin, K, Bakulin, I, Belousova, E, Gofman, A, Grinevich, V, Kulyapin, A, Nizov, A, Osipenko, M, Simanenkov, V, Tkachev, A, Uspenskiy, Y, Valuyskikh, E, Jovanovic, I, Nagorni, A, Svorcan, P, Zdravkovic, N, Bunganic, I, Abrahamovych, O, Bilianskyi, L, Datsenko, O, Golovchenko, O, Kharchenko, N, Klymenko, V, Levchenko, O, Lozynskyy, Y, Murenets, N, Oliinyk, O, Prystupa, L, Pyrogovskyi, V, Reznikova, V, Rishko, I, Stanislavchuk, M, Vizir, V, Yatsyshyn, R, Arasaradnam, R, Bloom, S, Cummings, F, Iqbal, T, Irving, P, Kaser, A, Shonde, A, Subramanian, S, Aberra, F, Aguilar, H, Araya, V, Bakken, A, Beaulieu, D, Cappa, Ja, Chiorean, M, Cohen, N, Dryden, G, Duvall, G, Ehrlich, A, Eisner, M, Ertan, A, Fogel, R, Friedenberg, K, Gatof, D, Glover, S, Grosman, I, Gunaratnam, N, Gupta, N, Haynes, P, Hemaidan, A, Higgins, P, Hou, J, Hudesman, D, Iskandar, H, Jazrawi, S, Jones, M, Karnam, U, Khurana, S, Killpack, M, Kreines, M, Lawlor, G, Lee, S, Loftus, E, Lukin, Dj, Marcet, J, Mattar, M, Melmed, G, Minor, T, Mirkin, K, Mutlu, E, Nichols, M, Nudell, J, Rai, R, Ramos, C, Mcleod, Randall, Rausher, D, Ritter, T, Singh Saini, S, Salzberg, B, Saubermann, L, Scherl, E, Sedghi, S, Sellin, J, Shafran, I, Sorrentino, D, Suiter, D, Swaminath, A, Tiongco, F, Vrabie, R, Walp, K, Warner, N, Winstead, N, Wolf, Dc, Woods, J, Yen, E, Younes, Z., Centre Hospitalier Régional Universitaire de Nancy (CHRU Nancy), Nutrition-Génétique et Exposition aux Risques Environnementaux (NGERE), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Lorraine (UL), Humanitas Clinical and Research Center [Rozzano, Milan, Italy], RS: NUTRIM - R2 - Liver and digestive health, MUMC+: MA Maag Darm Lever (9), Interne Geneeskunde, Sands, Be, Sandborn, Wj, Panaccione, R, O'Brien, Cd, Zhang, H, Johanns, J, Adedokun, Oj, Li, K, Peyrin-Biroulet, L, Van Assche, G, Danese, S, Targan, S, Abreu, Mt, Hisamatsu, T, Szapary, P, and Marano, C

Subjects
Adult, Male, Infusions, [SDV]Life Sciences [q-bio], Injections, Subcutaneous, Anti-Inflammatory Agents, Ulcerative, Klinikai orvostudományok, Article, Injections, Maintenance Chemotherapy, Dose-Response Relationship, 03 medical and health sciences, 0302 clinical medicine, Double-Blind Method, INFLIXIMAB, Colitis, Ulcerative, Dose-Response Relationship, Drug, Female, Humans, Induction Chemotherapy, Infusions, Intravenous, Patient Acuity, Remission Induction, Ustekinumab, ComputingMilieux_MISCELLANEOUS, ACTIVITY INDEXES, Subcutaneous, Orvostudományok, General Medicine, EFFICACY, Colitis, 3. Good health, INFECTIONS, 030220 oncology & carcinogenesis, 030211 gastroenterology & hepatology, Drug, Intravenous
Abstract

The efficacy of ustekinumab, an antagonist of the p40 subunit of interleukin-12 and interleukin-23, as induction and maintenance therapy in patients with ulcerative colitis is unknown.We evaluated ustekinumab as 8-week induction therapy and 44-week maintenance therapy in patients with moderate-to-severe ulcerative colitis. A total of 961 patients were randomly assigned to receive an intravenous induction dose of ustekinumab (either 130 mg [320 patients] or a weight-range-based dose that approximated 6 mg per kilogram of body weight [322]) or placebo (319). Patients who had a response to induction therapy 8 weeks after administration of intravenous ustekinumab were randomly assigned again to receive subcutaneous maintenance injections of 90 mg of ustekinumab (either every 12 weeks [172 patients] or every 8 weeks [176]) or placebo (175). The primary end point in the induction trial (week 8) and the maintenance trial (week 44) was clinical remission (defined as a total score of ≤2 on the Mayo scale [range, 0 to 12, with higher scores indicating more severe disease] and no subscore1 [range, 0 to 3] on any of the four Mayo scale components).The percentage of patients who had clinical remission at week 8 among patients who received intravenous ustekinumab at a dose of 130 mg (15.6%) or 6 mg per kilogram (15.5%) was significantly higher than that among patients who received placebo (5.3%) (P0.001 for both comparisons). Among patients who had a response to induction therapy with ustekinumab and underwent a second randomization, the percentage of patients who had clinical remission at week 44 was significantly higher among patients assigned to 90 mg of subcutaneous ustekinumab every 12 weeks (38.4%) or every 8 weeks (43.8%) than among those assigned to placebo (24.0%) (P = 0.002 and P0.001, respectively). The incidence of serious adverse events with ustekinumab was similar to that with placebo. Through 52 weeks of exposure, there were two deaths (one each from acute respiratory distress syndrome and hemorrhage from esophageal varices) and seven cases of cancer (one each of prostate, colon, renal papillary, and rectal cancer and three nonmelanoma skin cancers) among 825 patients who received ustekinumab and no deaths and one case of cancer (testicular cancer) among 319 patients who received placebo.Ustekinumab was more effective than placebo for inducing and maintaining remission in patients with moderate-to-severe ulcerative colitis. (Funded by Janssen Research and Development; UNIFI ClinicalTrials.gov number, NCT02407236.).

Published
2019

16. Thin film transformer and its analysis by integral equation method

Author

Marinova, I., Midorikawa, Y., Hayano, S., and Saito, Y.

Subjects
Electric transformers -- Design and construction, Magnetic fields -- Measurement, Magnetic induction (Electromagnetic induction) -- Measurement, Integral equations -- Numerical solutions, Numerical analysis -- Methods, Business, Electronics, Electronics and electrical industries
Abstract

Recently, we proposed a new high frequency transformer that could allow the manufacture of small power supplies. In this paper, we propose a thin film transformer for small electronic devices, and apply the integral equation method to analyze this transformer. Both the primary and secondary coils of the film transformer are arranged coaxially on one layer and multiply laminated. The operation principal of the transformer is based on the skin effect and the mutual effect between the coils at high frequency. Because of the coaxially arranged coils, the magnetic field of the transformer can be modeled with an axisymmetric assumption. Using the model, we evaluate the electromagnetic field and calculate the lumped circuit parameters, i.e., inductance and resistance, which are compared with experimental values. A fairly good agreement is obtained. Thus, the applied method is quite useful for design and investigation of the thin film transformer.

Published
1995

17. Inverse approach for shape design of magnetic core

Author

Marinova, I., Hayano, S., and Saito, Y.

Subjects
Magnetic materials -- Models, Magnetic fields -- Models, Engineering design -- Models, Business, Electronics, Electronics and electrical industries
Abstract

The paper proposes an inverse approach for the identification of magnetic material or for the shape design of a magnetic core. The magnetic material may be replaced with simple layer distribution of imaginary currents on its boundary. Thus, the inverse identification or magnetic core design problem can be reduced to source searching for the simple layer distribution of imaginary currents. The pattern matching figure is employed for the source position searching. The results obtained reveal that the approach is quite effective for solving such problems.

Published
1995

18. Electromagnetic field analysis of film transformer

Author

Midorikawa, Y., Marinova, I., Hayano, S., and Saito, Y.

Subjects
Electromagnetic fields -- Analysis, Electric transformers -- Research, Business, Electronics, Electronics and electrical industries
Abstract

In this paper, we investigate a thin film transformer for small electronic devices. This transformer is composed of the lamination of thin film conductors. Both the primary and secondary coils of the film transformer are arranged coaxially on one layer and multiply laminated. The operation principle of the transformer is based on the skin effect and the mutual effect between the coils at high frequency. Using the integral equation method, we evaluate the electromagnetic field and calculate the lumped circuit parameters, (e.g. inductance and resistance, etc.). A fairly good agreement is obtained comparing with experimental values. Thus, the applied method is quite useful for design and investigation of the thin film transformer.

Published
1995

20. VizieR Online Data Catalog: HST/ACS Coma Cluster Survey. VI. (den Brok+, 2011)

Author

den Brok, M., Peletier, R. F., Valentijn, E. A., Balcells, M., Carter, D., Erwin, P., Ferguson, H. C., Goudfrooij, P., Graham, A. W., Hammer, D., Lucey, J. R., Trentham, N., Guzman, R., Hoyos, C., Verdoes Kleijn, G., Jogee, S., Karick, A. M., Marinova, I., Mouhcine, M., Weinzirl, T., and Astronomy

Subjects
Redshifts, Galaxies: photometry, Photometry: HST
Abstract

We have used the data from the HST/ACS Coma Cluster Survey, a deep two-passband imaging survey of the Coma cluster. A full description of the observations and data reduction can be found in Paper I (Carter et al., 2008ApJS..176..424C). We have derived colour gradients for a sample of confirmed or very likely Coma cluster members. (2 data files).

Published
2018

21. Analysis of a ferroresonant circuit with chaotic behavior by means of a Chua-type magnetization model

Author

Endo, H., Marinova, I., Hayano, S., and Saito, Y.

Subjects
Electromagnetism -- Research, Ferromagnetism -- Research, Business, Electronics, Electronics and electrical industries
Abstract

This paper studies the chaotic behavior of a series ferroresonant circuit. At first, we derive a state variable equation containing a nonlinear hysteretic circuit element represented by a Chua-type magnetization model. Second, the backward Euler method with automatic modification gives transient response of the state variable equation. The characteristic values of the state transition matrix are calculated in each calculation step of Euler method. Finally, it is clarified that the characteristic values trace on the same loci although the chaotic phenomenon is exhibiting. Index Terms--Chaotic phenomenon, Chua-type magnetization model, nonlinear calculation, series ferroresonant circuit.

Published
2003

23. New complex permeability measurement device for thin magnetic films

Author

Hayano, S., Marinova, I., and Saito, Y.

Subjects
Finite element method -- Analysis, Hysteresis -- Measurement, Physics
Abstract

The combination of the strategic dual image technique with complex permeability enables the evaluation of finite element solutions of open boundary hysteric field problems. Accurate evaluation is obtained by the use of frequency characteristic measurement device.

Published
1994

24. Polyphase eddy current testing

Author

Marinova, I., Hayano, S., Ishida, N., Saito, Y., Hirama, Y., and Yamamoto, M.

Subjects
Eddy currents (Electric) -- Analysis, Physics
Abstract

Polyphase eddy current testing, whose sensitivity was higher than that of conventional eddy current testing, was proposed to detect defective targets. The faulty targets were identified when balanced polyphase currents were introduced into primary coils. The target consisted of secondary polyphase circuits.

Published
1994

25. Defect recognition in conductive materials by local magnetic-field measurement

Author

Doi, T., Hayano, S., Marinova, I., Ishida, N., and Saito, Y.

Subjects
Magnetic materials -- Research, Electric currents -- Analysis, Physics
Abstract

Electric potential measurements replaced the local magnetic field in a method to effectively identify defects in conductive materials with low resistivity. This substitution lowered electrical contact resistance which enhanced the accuracy of local electrical potential measurements. The method was useful for detecting defects in iron bridges, nuclear reactors and aircraft.

Published
1994

26. Ustekinumab as induction and maintenance therapy for Crohn's disease

Author

Feagan, Bg, Sandborn, Wj, Gasink, C, Jacobstein, D, Lang, Y, Friedman, Jr, Blank, Ma, Johanns, J, Gao, Ll, Miao, Y, Adedokun, Oj, Sands, Be, Hanauer, Sb, Vermeire, S, Targan, S, Ghosh, S, de Villiers WJ, Colombel, Jf, Tulassay, Z, Seidler, U, Salzberg, Ba, Desreumaux, P, Lee, Sd, Loftus EV Jr, Dieleman, La, Katz, S, Rutgeerts, P, Bampton, P, Chung, A, Connor, S, Debinski, H, Leong, R, Macrae, F, Pavli, P, Sorrentino, D, van den Bogaerde, J, Vogel, W, Vogelsang, H, Louis, E, Mana, F, Zaltman, C, Aumais, G, Bernstein, C, Bressler, B, Dhalla, S, Dieleman, L, Feagan, B, Marshall, J, Panaccione, R, Ropeleski, M, Stehlik, J, Volfova, M, Brynskov, J, Glerup, H, Abitbol-Selinger, V, Allez, M, Beaugerie, L, Bourreille, A, Cadiot, G, Dupas, J, Grimaud, J, Laharie, D, Lerebours, E, Moreau, J, Baumgart, D, Brand, S, Ebert, M, Ehehalt, R, Hasselblatt, P, Howaldt, S, Klaus, J, Krummenerl, P, Kucharzik, T, Lügering, A, Mudter, J, Preiss, J, Schreiber, S, Stallmach, A, Stein, J, Strauch, U, Salamon, A, Patchett, S, Lahat-Zok, A, Rachmilewitz, D, Annese, V, Bossa, F, Guidi, L, Kohn, A, Rocca, R, Ando, A, Ashida, T, Hanai, H, Ishida, T, Ito, H, Matsumoto, T, Motoya, S, Nakamura, S, Sameshima, Y, Suzuki, Y, Watanabe, K, Yamagami, H, Yamamoto, T, Yao, K, Kim, H, Kim, Y, D'Haens, G, Pierik, M, van Bodegraven, A, van der Woude CJ, Gearry, R, Ciecko-Michalska, I, Malecka-Panas, E, Jojic, N, Aboo, N, Wright, J, Arranz, M, Viso, L, Ahmad, T, Bloom, S, Campbell, S, Creed, T, Cummings, F, Hawthorne, B, Iqbal, T, Ireland, A, Parkes, M, Pollok, R, Shaw, I, Shonde, A, Smith, M, Steel, A, Subramanian, S, Travis, S, Tremelling, M, Aberra, F, Abraham, B, Barish, C, Behm, B, Birbara, C, Bochner, R, Bologna, S, Brant, S, Charles, R, Cohen, N, de Villers, W, Dryden, G, Duvall, A, Flasar, M, Fleisher, M, Florez, D, Fogel, R, Gagneja, H, Gross, C, Hamilton, J, Hanauer, S, Hanson, J, Hardi, R, Higgins, P, Isaacs, K, Katz, J, Kaur, N, Khan, N, Lee, S, Leman, B, Levenson, S, Lichtiger, S, Loftus, E, Malik, P, Mcnair, A, Melmed, G, Miner, P, Nichols, M, Noar, M, Oikonomou, I, Oubre, B, Peterson, K, Pruitt, R, Quirk, D, Safdi, A, Safdi, M, Salzberg, B, Sandborn, W, Saubermann, L, Scherl, E, Schwartz, D, Schwarz, R, Sedghi, S, Selby, L, Shafran, I, Siegel, C, Sninsky, C, Stern, M, Stockwell, D, Stone, C, Swaminath, A, Swoger, J, Taormina, M, Williams, E, Winstead, N, Wolf, D, Wolosin, J, Yacyshyn, B, Yajnik, V, Yen, E, Hetzel, D, Muls, V, Bafutto, M, Francesconi, C, Sipahi, A, Steinwurz, F, Churchev, J, Kotzev, I, Marinova, I, Penchev, P, Spassova, Z, Stoinov, S, Takov, D, Vassileva, G, Fowler, S, Greenberg, G, Jones, J, Saibil, F, Salh, B, Banić, M, Duvnjak, M, Stimac, D, Goujon, G, Pelletier, A, Peyrin-Biroulet, L, Aldinger, V, Bokemeyer, B, Büning, C, Konturek, J, Krummenerl, T, Ochsenkuehn, T, Altorjay, I, Kis, J, Pecsi, G, Székely, A, Varga, M, Vincze, A, Wacha, J, Oddsson, E, Orvar, K, Avni-Biron, I, Fishman, S, Fraser, G, Konikoff, F, Melzer, E, Oren, R, Shirin, H, Danese, S, Marino, M, Sturniolo, Gc, Horiki, N, Iijima, H, Iwabuchi, M, Kanai, T, Kunisaki, R, Maemoto, A, Matsuoka, K, Osada, T, Sugimoto, K, Tanaka, S, Cheon, Jh, Han, Ds, Jang, Bi, Kim, Hj, Kim, Js, Kim, Yh, Park, Sj, Yang, Sk, Arnold, M, Claydon, A, Haines, M, Hill, J, Rowbotham, D, Schultz, M, Wallace, I, Bochenek, A, Niezgoda, K, Szura, M, Arutyunov, G, Baranovsky, A, Khalif, I, Osipenko, M, Milinic, N, Bloch, H, Kruger, Fc, Prins, M, Watermeyer, G, Ziady, C, Calvo, Xc, Domínguez-Muñoz, Je, Gisbert, Jp, Arsenescu, R, Beaulieu, D, Bedford, R, Behrend, C, Cleavinger, P, Cohen, J, Ertan, A, Freilich, B, Friedenberg, K, Glover, S, Gordon, G, Gunaratnam, N, Gupta, N, Holbrook, R, Jones, M, Kaufman, B, Khan, Nh, Khurana, S, Legnani, P, Mutlu, E, Phillips, R, Rai, R, Reichelderfer, M, Ritter, T, Safdi, Ma, Sands, B, Schulman, M, Smith, J, Suiter, D, Taylor, D, Vasudeva, R, Winstead, T, Zwick, A, Savoye, G, Atreya, R, Ochsenkuhn, T, Ott, C, Goldin, E, Motohiro, E, Takanori, K, Park, S, James, B, Cummings, J, Tariq, A, Willert, R, Allan, M, Bulat, R, Devilliers, W, Eaker, E, Hou, J, Mendu, S, Nicols, M, Proctor, D, Thosani, N, Zhang, C, and UNITI-IM-UNITI Study Group

Subjects
030203 arthritis & rheumatology, Adult, Male, Infusions, Medicine (all), Remission Induction, Crohn Disease, Female, Humans, Induction Chemotherapy, Infusions, Intravenous, Maintenance Chemotherapy, Middle Aged, Ustekinumab, General Medicine, Orvostudományok, Klinikai orvostudományok, 030207 dermatology & venereal diseases, 03 medical and health sciences, 0302 clinical medicine, Intravenous
Abstract

Ustekinumab, a monoclonal antibody to the p40 subunit of interleukin-12 and interleukin-23, was evaluated as an intravenous induction therapy in two populations with moderately to severely active Crohn's disease. Ustekinumab was also evaluated as subcutaneous maintenance therapy.We randomly assigned patients to receive a single intravenous dose of ustekinumab (either 130 mg or approximately 6 mg per kilogram of body weight) or placebo in two induction trials. The UNITI-1 trial included 741 patients who met the criteria for primary or secondary nonresponse to tumor necrosis factor (TNF) antagonists or had unacceptable side effects. The UNITI-2 trial included 628 patients in whom conventional therapy failed or unacceptable side effects occurred. Patients who completed these induction trials then participated in IM-UNITI, in which the 397 patients who had a response to ustekinumab were randomly assigned to receive subcutaneous maintenance injections of 90 mg of ustekinumab (either every 8 weeks or every 12 weeks) or placebo. The primary end point for the induction trials was a clinical response at week 6 (defined as a decrease from baseline in the Crohn's Disease Activity Index [CDAI] score of ≥100 points or a CDAI score150). The primary end point for the maintenance trial was remission at week 44 (CDAI score150).The rates of response at week 6 among patients receiving intravenous ustekinumab at a dose of either 130 mg or approximately 6 mg per kilogram were significantly higher than the rates among patients receiving placebo (in UNITI-1, 34.3%, 33.7%, and 21.5%, respectively, with P≤0.003 for both comparisons with placebo; in UNITI-2, 51.7%, 55.5%, and 28.7%, respectively, with P0.001 for both doses). In the groups receiving maintenance doses of ustekinumab every 8 weeks or every 12 weeks, 53.1% and 48.8%, respectively, were in remission at week 44, as compared with 35.9% of those receiving placebo (P=0.005 and P=0.04, respectively). Within each trial, adverse-event rates were similar among treatment groups.Among patients with moderately to severely active Crohn's disease, those receiving intravenous ustekinumab had a significantly higher rate of response than did those receiving placebo. Subcutaneous ustekinumab maintained remission in patients who had a clinical response to induction therapy. (Funded by Janssen Research and Development; ClinicalTrials.gov numbers, NCT01369329 , NCT01369342 , and NCT01369355 .).

Published
2016

29. The HST/ACS Coma Cluster Survey: VI. Colour gradients in giant and dwarf early-type galaxies

Author

den Brok, M., Peletier, R. F., Valentijn, E. A., Balcells, Marc, Carter, D., Erwin, P., Ferguson, H. C., Goudfrooij, P., Graham, A. W., Hammer, D., Lucey, J. R., Trentham, N., Guzman, R., Hoyos, C., Kleijn, G. Verdoes, Jogee, S., Karick, A. M., Marinova, I., Mouhcine, M., Weinzirl, T., and Kapteyn Astronomical Institute

Subjects
METALLICITY GRADIENTS, BRIGHT ELLIPTIC GALAXIES, CCD SURFACE PHOTOMETRY, MODELS, Astrophysics::Cosmology and Extragalactic Astrophysics, galaxies: dwarf, MASS, TELESCOPE ADVANCED CAMERA, EVOLUTION, VIRGO-CLUSTER, STRUCTURAL PARAMETERS, galaxies: clusters: individual: Coma, galaxies: elliptical and lenticular, cD, STELLAR POPULATION GRADIENTS, galaxies: structure, Astrophysics::Earth and Planetary Astrophysics, Astrophysics::Galaxy Astrophysics
Abstract

Using deep, high-spatial-resolution imaging from the Hubble Space Telescope/Advanced Camera for Surveys (HST/ACS) Coma Cluster Treasury Survey, we determine colour profiles of early-type galaxies in the Coma cluster. From 176 galaxies brighter than M-F814W(AB) = -15 mag that are either spectroscopically confirmed members of Coma or identified by eye as likely members from their low surface brightness, data are provided for 142 early-type galaxies. Typically, colour profiles are linear against log (R), sometimes with a nuclear region of distinct, often bluer colour associated with nuclear clusters. Colour gradients are determined for the regions outside the nuclear components. We find that almost all colour gradients are negative, both for elliptical and for lenticular galaxies. Most likely, earlier studies that report positive colour gradients in dwarf galaxies are affected by the bluer colours of the nuclear clusters, underlining that high-resolution data are essential to disentangle the colour properties of the different morphological components in galaxies. Colour gradients of dwarf galaxies form a continuous sequence with those of elliptical galaxies, becoming shallower towards fainter magnitudes. Interpreting the colours as metallicity tracers, our data suggest that dwarfs as well as giant early-type galaxies in the Coma cluster are less metal rich in their outer parts. We do not find evidence for environmental influence on the gradients, although we note that most of our galaxies are found in the central regions of the cluster. For a subset of galaxies with known morphological types, S0 galaxies have less steep gradients than elliptical galaxies.

Published
2011

30. Barred Galaxies in the Coma Cluster

Author

Marinova, I., Jogee, S., Trentham, N., C. Ferguson, H., Weinzirl, T., Balcells, M., Carter, D., den Brok, M., Erwin, P., W. Graham, A., Goudfrooij, P., Guzmán, R., Hammer, D., Hoyos, C., Peletier, R.F., Peng, E., V. Kleijn, G., Stanford, L.M., Green, J.D., Hai, L., Mao, Y., and Astronomy

Subjects
Astrophysics::Earth and Planetary Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics::Galaxy Astrophysics
Abstract

We use ACS data from the HST Treasury survey of the Coma cluster (z˜0.02) to study the properties of barred galaxies in the Coma core, the densest environment in the nearby Universe. This study provides a complementary data point for studies of barred galaxies as a function of redshift and environment. From ˜470 cluster members brighter than MI = -11 mag, we select a sample of 46 disk galaxies (S0-Im) based on visual classification. The sample is dominated by S0s for which we find an optical bar fraction of 47±11% through ellipse fitting and visual inspection. Among the bars in the core of the Coma cluster, we do not find any very large (abar>2 kpc) bars. Comparison to other studies reveals that while the optical bar fraction for S0s shows only a modest variation across low-to-intermediate density environments (field to intermediate-density clusters), it can be higher by up to a factor of ˜ 2 in the very high-density environment of the rich Coma cluster core.

Published
2010

31. Electromagnetic Field Modeling In Human Tissue

Author

Marinova, I. and Valentin Mateev

Subjects
electromagnetic field, Quantitative Biology::Tissues and Organs, Physics::Medical Physics, finite element method, humantissue
Abstract

For investigations of electromagnetic field distributions in biological structures by Finite Element Method (FEM), a method for automatic 3D model building of human anatomical objects is developed. Models are made by meshed structures and specific electromagnetic material properties for each tissue type. Mesh is built according to specific FEM criteria for achieving good solution accuracy. Several FEM models of anatomical objects are built. Formulation using magnetic vector potential and scalar electric potential (A-V, A) is used for modeling of electromagnetic fields in human tissue objects. The developed models are suitable for investigations of electromagnetic field distributions in human tissues exposed in external fields during magnetic stimulation, defibrillation, impedance tomography etc., {"references":["S. Zachow, M. Zilske, H-C. Hege. 3D Reconstruction of Individual\nAnatomy from Medical Image Data: Segmentation and Geometry\nProceedings of the 25th CADFEM Users- Meeting 2007, Congress\nCenter Dresden, Germany, November 21-23, 2007.","K. Neubert et al. Model-Based Autosegmentation of Brain Structures\nin the Honeybee Using Statistical Shape Models, Proc. 8th Int. Congr.\nof Neuroethology, 2007","J. Cebral , R. Lohner. \"From Medical Images to Anatomically\nAccurate Finite Element Grids\". Int. Journal For Numerical Methods\nin Engineering, 51(8), 2001, pp. 985-1008.","J. Zheng , L. Li, X. Huo. ÔÇ×Analysis of Electric Field in Real Head\nModel during Transcranial Magnetic Stimulation\". Proceedings of the\n2005 IEEE Engineering in Medicine and Biology, 27th Annu. Conf.,\nShang Hai, 2005.","ANSYS Release 12.0 Documentation.","P. Basser, B. Roth. \"New currents in electrical stimulation of excitable\ntissues\". Annu. Rev. Biomed. Eng., 02, 2000, pp. 377-397.","P. Tofts, \"The distribution of induced current in magnetic stimulation\nof the nervous system.\" Phys. Med. Biol. 35, 1990, pp. 1119-1128.","J. Ruohonen, P. Ravazzani, J. Nilsson, M. Panizza, F. Grandori and G.\nTognola. \"A volume-conduction analysis of magnetic stimulation of\nperipheral nerves.\" IEEE Trans. Biomed. Eng. 1996, 43, pp. 669-678.","P. Karu, M. Stuchly. \"Quasi-static electric field in a cylindrical\nvolume conductor induced by external coils.\" IEEE Trans. Biomed.\nEng., 41, 1994, pp. 151-158.\n[10] B. Roth, J. Saypol, M. Hallet, L. Cohen. \"A theoretical calculation of\nthe electric field induced by magnetic stimulation of a peripheral\nnerve\", Muscle & Nerve, 13, 1994, pp. 734-741.\n[11] S. Nagarajan, M. Durand. \"Analysis of magnetic stimulation of a\nconcentric axon in a nerve bundle.\" IEEE Trans. Biomed. Eng., 42,\n1995, pp. 926-932.\n[12] B. Roth, J. Saypol, M. Hallet, L. Cohen. \"A theoretical calculation of\nthe electric field induced in the cortex during magnetic stimulation\",\nElectroenceph. Clin. Neurophysiol, 81, 1991, pp. 47-56.\n[13] P. Ragan, W. Wang, S. Eisenbrg. ÔÇ×Magnetically induced currents in\nthe canine Heart. A finite element study\", IEEE Trans Biomed Eng,\n1995, 42, pp. 1110-1116.\n[14] V. Krasteva, S. Papazov, I. Daskalov. \"Magnetic Stimulation for nonhomogeneous\nbiological structures\", BioMed Eng Online 2002, pp.\n1:3.\n[15] P. Miranda, M. Hallet, P. Basser. The electric field induced in the\nbrain by magnetic stimulation: \"A 3D Finite-element analysis of the\neffect of tissue heterogeneity and anisotropy\", IEEE Trans Biomed\nEng, 50, 2003, pp. 1074-1085.\n[16] J. Malmivuo, J. Plonsey. Bioelectromagnetism. Oxford University\nPress, New York-Oxford 1995.\n[17] U. Pliquett, S. Gallo, S. Hui, Ch. Gusbeth, E. Neumann. \"Local and\ntransient structural changes in stratum corneum at high electric fields:\ncontribution of Joule heating\", Bioelectrochem., Vol. 67, 2005. pp. 37-\n46."]}

Published
2010
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32. The VIRUS-P Exploration of Nearby Galaxies (VENGA): Survey Design and First Results

Author

Blanc, G. A., Gebhardt, K., Heiderman, A., Evans, N. J., Jogee, S., Remco van den Bosch, Marinova, I., Weinzirl, T., Yoachim, P., Drory, N., Fabricius, M., Fisher, D., Hao, L., Macqueen, P. J., Shen, J., Hill, G. J., and Kormendy, J.

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), Astrophysics of Galaxies (astro-ph.GA), FOS: Physical sciences, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM), Astrophysics - Astrophysics of Galaxies, Astrophysics::Galaxy Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

VENGA is a large-scale extragalactic IFU survey, which maps the bulges, bars and large parts of the outer disks of 32 nearby normal spiral galaxies. The targets are chosen to span a wide range in Hubble types, star formation activities, morphologies, and inclinations, at the same time of having vast available multi-wavelength coverage from the far-UV to the mid-IR, and available CO and 21cm mapping. The VENGA dataset will provide 2D maps of the SFR, stellar and gas kinematics, chemical abundances, ISM density and ionization states, dust extinction and stellar populations for these 32 galaxies. The uniqueness of the VIRUS-P large field of view permits these large-scale mappings to be performed. VENGA will allow us to correlate all these important quantities throughout the different environments present in galactic disks, allowing the conduction of a large number of studies in star formation, structure assembly, galactic feedback and ISM in galaxies., 7 pages, 3 figures, proceedings of the "Third Biennial Frank N. Bash Symposium, New Horizons in Astronomy" held in Austin, TX, Oct. 2009. To be published in the Astronomical Society of the Pacific Conference Series, eds. L. Stanford, L. Hao, Y. Mao, J. Green

Published
2010

33. R&D+i for ceramic tiles in the 21st century: Competition, diversity, and functionality

Author

Sánchez Muñoz, Luis, Marinova, I. T., Fuente, Germán F. de la, Núñez, I., Rodríguez, Miguel A., Sanz Lázaro, Jesús, and Carda, J. B.

Abstract

14 páginas, 6 figuras.-- Comunicación presentada al XIth World Congress on Ceramic Tile Quality celebrada en Febrero de 2010 en Castellón (España)., The Spanish ceramic tile manufacturing sector (which also refers to raw material suppliers and producers of bodies, glazes, frits, engobes and pigments) is facing a most singular moment in its history. First of all, it needs to overcome the economic downturn that started in 2008 before going on to deal with the fierce competition from other countries emerging as competitive producers in the post-crisis scenario. Nowadays, the sector has a more or less homogenous character in which the different companies tend to produce very similar materials and therefore compete for the same market. This paper proposes two alternative but compatible road maps that provide a possible future strategy to diversify the sector’s supply offer by planning its R&D+i to: i) achieve significant production cost savings for standard ceramic products, and ii) to develop new specialised ceramic materials that meet the specific cultural and practical needs of each particular market environment. In the short term, the ideal strategy would be to develop the first alternative in order to produce ceramic bodies at significantly lower firing temperatures than at present, the immediate effect of which would be to reduce glaze thickness and the amount and size of pigment particles, thereby opening the way to mass usage of thin-film decorating techniques (such as ink jets) and even laser techniques. In the medium and long term, the second alternative needs to be followed, to increase the overall added value of ceramic tiles, which depends on the skills and ingenuity of researchers and technicians alike to come up with a wide-ranging diversity of ceramic products., The authors would like to extend their gratitude to to the Dávalos Fletcher Foundation (Castellón), for its financial support.

Published
2010

36. Submillimeter Galaxies

Author

Jogee, Shardha, Marinova, I., Hao, L., Blanc, G. A., Blain, Andrew W., Jogee, Shardha, Marinova, I., Hao, L., Blanc, G. A., and Blain, Andrew W.

Abstract

The Universe was a more exciting place at moderate to high redshifts z ~ 3, after reionization took place, but before the present day galaxy properties were firmly established. From a wide variety of directions, we are gaining insight into the Universe at these epochs. Less gas was sequestered into stars and had been ejected into the interstellar medium as weakly emitting, slowly cooling debris, because a significant amount of star formation and supermassive blackhole growth in active galactic nuclei (AGNs) was still to occur. Furthermore, the processes that shape today’s galaxies were at work, and can be seen in real time with the appropriate tools. The most active regions of galaxies at these redshifts are deeply obscured at ultraviolet and optical wavelengths by an opaque interstellar medium (ISM) that absorbs most of their radiation, and then re-emits at far-infrared (IR) wavelengths. This emission provides us with a very powerful probe of the regions within galaxies where the most intense activity takes place; both their total energy output, and from spectroscopy, about the physics and chemistry of the atomic and molecular gas that fuels, hides and surrounds these regions. This information is unique, but not complete: radio, mid- and near-IR, optical and X-ray observations each provide unique complementary views. Nevertheless, probing the obscured Universe, with the Atacama Large (Sub-)Millimeter Array (ALMA), James Webb Space Telescope (JWST), Herschel Space Observatory, Wide Field Infrared Survey Explorer (WISE), and missions and telescopes that are not yet in construction, like an actively cooled sub-10-m class IR space telescope and a 25-m class ground-based submillimeter/THz telescope (CCAT) will provide a more complete picture of in which neighborhoods, by what means and how quickly the most vigorous bursts of activity take place.

Published
2009

42. Relating basic properties of bright early-type dwarf galaxies to their location in Abell 901/902

Author

Barazza, F. D., primary, Wolf, C., additional, Gray, M. E., additional, Jogee, S., additional, Balogh, M., additional, McIntosh, D. H., additional, Bacon, D., additional, Barden, M., additional, Bell, E. F., additional, Böhm, A., additional, Caldwell, J. A. R., additional, Häussler, B., additional, Heiderman, A., additional, Heymans, C., additional, Jahnke, K., additional, van Kampen, E., additional, Lane, K., additional, Marinova, I., additional, Meisenheimer, K., additional, Peng, C. Y., additional, Sanchez, S. F., additional, Taylor, A., additional, Wisotzki, L., additional, and Zheng, X., additional

Published
2009
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