Results 41 to 50 of about 62,829 (219)

Steps Toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. XVI. A Thirteen-Year Study of Spectral Variability in NGC 5548 [PDF]

, 2002
We present the final installment of an intensive 13-year study of variations of the optical continuum and broad H-beta emission line in the Seyfert 1 galaxy NGC 5548.
Berlind, P., Bertram, R., Bischoff, K., Bochkarev, N. G., Borisov, N., Burenkov, A. N., Calkins, M., Carrasco, L., Chavushyan, V. H., Chornock, R., Dietrich, M., Doroshenko, V. T., Ezhkova, O. V., Filippenko, A. V., Gilbert, A. M., Huchra, J. P., Kollatschny, W., Leonard, D. C., Li, W., Lyuty, V. M., Malkov, Yu. F., Matheson, T., Merkulova, N. I., Mikhailov, V. P., Modjaz, M., Onken, C. A., Peterson, Bradley M., Pogge, R. W., Pronik, V. I., Qian, B., Romano, P., Sergeev, S. G., Sergeeva, E. A., Shapovalova, A. I., Spiridonova, O. I., Tao, J., Tokarz, S., Valdes, J. R., Vlasiuk, V. V., Wagner, R. M., Wilkes, B. J.   +40 more
core   +2 more sources

Cognitive Symbionts. Expanding the Scope of Cognitive Science With Fungi

Topics in Cognitive Science, EarlyView.
Abstract It has been argued that fungi have cognitive capacities, and even conscious experiences. While these arguments risk ushering in unproductive disputes about how words like “mind,” “cognitive,” “sentient,” and “conscious” should be used, paying close attention to key properties of fungal life can also be uncontroversially productive for ...
Matteo Colombo
wiley   +1 more source

Por uma Ecologia da Somática?

Revista Brasileira de Estudos da Presença, 2014
Este texto trata do parentesco conceitual e teórico entre Somática e Ecologia Científica. Após definir a noção científica de Ecologia, procuram-se definir três conceitos-chave da Ecologia: o de potencial, que permite descrever, de forma inovadora, o ...
Isabelle, Joanne
doaj  

Far-UV Observations of NGC 4151 during the ORFEUS-SPAS II Mission [PDF]

, 1997
We observed the Seyfert 1 galaxy NGC 4151 on eleven occasions at 1-2 day intervals using the Berkeley spectrometer during the ORFEUS-SPAS II mission in 1996 November.
A. F. Davidsen, B. R. Espey, Bromage G., G. A. Kriss, Hurwitz M., J. H. Krolik, Ulrich M. H., W. Zheng, Z. Tsvetanov   +8 more
core   +2 more sources

Beyond Skills: The Role of Professional Involvement as a Safeguard Against AI‐Driven Automation Risk

Canadian Journal of Administrative Sciences / Revue Canadienne des Sciences de l'Administration, Volume 43, Issue 2, June 2026.
ABSTRACT Research studies on technological change indicates a growing risk of AI‐driven job transformation. Automated systems have increasingly taken over routine tasks, shifting workers toward roles requiring advanced thinking and feeling skills. Although these skills act as barriers to automation, little is known about their development pathways ...
Tania Saba, Jean Frantz Ricardeau Registre, Anne‐Marie Ouellet, Felix Ballesteros Leiva   +3 more
wiley   +1 more source

Reverberation Mapping and the Physics of Active Galactic Nuclei [PDF]

, 1997
Reverberation-mapping campaigns have revolutionized our understanding of AGN. They have allowed the direct determination of the broad-line region size, enabled mapping of the gas distribution around the central black hole, and are starting to resolve the
A Robinson, BM Peterson, BM Peterson, BM Peterson, BM Peterson, BM Peterson, BM Peterson, C Done, C Winge, C Winge, D Alloin, D Alloin, D Maoz, D Maoz, D Maoz, D Maoz, DM Crenshaw, E Pérez, FP Pijpers, GA Reichert, GJ Ferland, GM Stirpe, H Netzer, H Netzer, H Netzer, HL Marshall, I Wanders, I Wanders, I Wanders, J Clavel, JH Krolik, JH Krolik, K Horne, KT Korista, M Dietrich, M-H Ulrich, R Edelson, R Warwick, RD Blandford, RJ White, TE Carone, Th Boller, W Romanishin, W Welsh   +43 more
core   +2 more sources

Food Web Properties and the Type of Invasive Species Make the Ecosystem Vulnerable to Invasion

Aquatic Conservation: Marine and Freshwater Ecosystems, Volume 36, Issue 5, May 2026.
ABSTRACT Invasive species have long been acknowledged as potentially severe dangers to native ecosystems. Although some work has also been done with empirical food webs, more information is still needed to shed light on the cascading effects of invasive species in aquatic ecosystems.
Tiina Sävilammi, Silva Uusi‐Heikkilä, Anna Kuparinen   +2 more
wiley   +1 more source

Resúmenes de las tesis de grado en floricultura realizadas en la Facultad de Agronomía, Universidad Nacional de Colombia. Bogotá D.C., entre 1981 y 1993

Agronomía Colombiana, 1992
<p>Reconocimiento e identificación de <em>Phialophora cinerescens </em>y <em>Fusarium oxysporum </em>f. sp. <em>dianthi </em>en el cultivo del clavel en la sabana de Bogotá.
Casas Eduardo, Arbeláez Germán, Saavedra Alejandro, Chaves José Fransico, Molina Juan Carlos, Rodríguez Arias Pedro   +5 more
doaj  

Systematic spectral analysis of GX 339-4: influence of Galactic background and reflection models

, 2015
Black hole X-ray binaries display large outbursts, during which their properties are strongly variable. We develop a systematic spectral analysis of the 3-40 keV RXTE/PCA data in order to study the evolution of these systems and apply it to GX 339-4 ...
Coriat, Dunn, Dunn, Evans, Garcia, Nandi, Orlandini, Plant, Protassov, Remillard, Valinia   +10 more
core   +3 more sources

New constraints on the continuum-emission mechanism of AGN: Intensive monitoring of NGC 7469 in the X-ray and ultraviolet [PDF]

, 1998
We have undertaken near-continuous monitoring of the Seyfert 1 galaxy NGC 7469 in the X-ray with RXTE over a ~30d baseline. The source shows strong variability with a root-mean-square (rms) amplitude of ~16 per cent, and peak-to-peak variations of a ...
Abramowicz M. A., B. M. Peterson, Brandt W. N., Courvoisier T. J.-L., Done C., Fabian A. C., George I. M., Ghisellini G., Gondek D., Green A. R., Guilbert P. W., Guilbert P. W., I. M. George, J. Clavel, K. Nandra, M. A. Malkan, Marshall N., Matt G., Molendi S., Nandra K., Papadakis I., R. A. Edelson, R. F. Mushotzky, Santos-Lleo M., Shakura N. I., Sunyaev R. A., T. J. Turner, Zdziarski A. A.   +27 more
core   +3 more sources