scholarly journals Temporal constraints on the grouping of contour segments into spatially extended objects

1999 ◽  
Vol 39 (8) ◽  
pp. 1509-1529 ◽  
Author(s):  
Pieter R Roelfsema ◽  
H.Steven Scholte ◽  
Henk Spekreijse
2016 ◽  
Vol 7 (1) ◽  
pp. 9-26
Author(s):  
Antonio Somaini

"The article presents an in-depth analysis of Benjamin’s use of the German term Medium, in order to show how his entire media theory may be interpreted as centered on the interaction between the historically changing realm of the technical and material Apparate, and what he calls in the artwork essay the »Medium of perception«: the spatially extended environment, the atmosphere, the milieu, the Umwelt in which sensory experience occurs. This notion of »Medium of perception« is then located within the long, post-Aristotelian tradition of the media diaphana, whose traces can be found in the 1920s and 1930s in the writings of authors such as Béla Balázs, Fritz Heider, and László Moholy-Nagy. </br></br>Der Artikel präsentiert eine eingehende Analyse von Benjamins Gebrauch des deutschen Begriffs »Medium«, um zu zeigen, dass seine gesamte Medientheorie fokussiert ist auf die Interaktion zwischen dem historisch veränderlichen Bereich der technischen und materiellen Apparate einerseits und dem, was er in dem Kunstwerkaufsatz das »Medium der Wahrnehmung« nennt: die räumlich ausgedehnte Umgebung, die Atmosphäre, das Milieu, die Umwelt, in der sinnliche Wahrnehmung erfolgt. Dieser Begriff des »Mediums der Wahrnehmung« wird dann innerhalb der langen, nacharistotelischen Tradition der media diaphana verortet, deren Spuren in den 1920er und 1930er Jahren in den Schriften von Autoren wie Béla Balázs, Fritz Heider und László Moholy-Nagy zu finden sind."


2012 ◽  
Vol 35 (8) ◽  
pp. 1759
Author(s):  
Li-Hua WU ◽  
Ai-Xiang CHEN ◽  
Yun-Fei JIANG ◽  
Rui BIAN

2020 ◽  
Vol 634 ◽  
pp. A111 ◽  
Author(s):  
J. P. U. Fynbo ◽  
P. Møller ◽  
K. E. Heintz ◽  
J. N. Burchett ◽  
L. Christensen ◽  
...  

We report on the discovery of a peculiar broad absorption line (BAL) quasar identified in our Gaia-assisted survey of red quasars. The systemic redshift of this quasar was difficult to establish because of the absence of conspicuous emission lines. Based on deep and broad BAL troughs of at least Si IV, C IV, and Al III, a redshift of z = 2.41 was established under the assumption that the systemic redshift can be inferred from the red edge of the BAL troughs. However, we observe a weak and spatially extended emission line at 4450 Å that is most likely due to Lyman-α emission, which implies a systemic redshift of z = 2.66 if correctly identified. There is also evidence for the onset of Lyman-α forest absorption bluewards of 4450 Å and evidence for Hα emission in the K band consistent with a systemic redshift of z = 2.66. If this redshift is correct, the quasar is an extreme example of a detached low-ionisation BAL quasar. The BALs must originate from material moving with very large velocities ranging from 22 000 km s−1 to 40 000 km s−1. To our knowledge, this is the first case of a systemic-redshift measurement based on extended Lyman-α emission for a BAL quasar. This method could also be useful in cases of sufficiently distant BL Lac quasars without systemic-redshift information.


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