Both, Arend-Jan (author), Bugbee, Bruce (author), Kubota, Chieri (author), Lopez, Roberto G. (author), Mitchell, Cary (author), Runkle, Erik S. (author), Wallace, Claude (author), and Rutgers University
UT State University
University of Arizona
Michigan State University
Purdue University
Format:
Journal article
Publication Date:
2017-08
Published:
United States: American Society for Horticultural Science
Location:
Agricultural Communications Documentation Center, Funk Library, University of Illinois Box: 16 Document Number: D10439
6 pages., Via online journal., Electric lamps are widely used to supplement sunlight (supplemental lighting) and daylength extension (photoperiodic lighting) for the production of horticultural crops in greenhouses and controlled environments. Recent advances in light-emitting diode (LED) technology now provide the horticultural industry with multiple lighting options. However, growers are unable to compare technologies and LED options because of insufficient data on lamp performance metrics. Here, we propose a standardized product label that facilitates the comparison of lamps across manufacturers. This label includes the photosynthetically active radiation (PAR) efficacy, PAR conversion efficiency, photon flux density output in key wave bands, as well as the phytochrome photostationary state (PSS), red/far red ratio, and graphs of the normalized photon flux density across the 300–900 nm wave band and a horizontal distribution of the light output.
Brosius, Hans-Bernd (author), Mundorf, Norbert (author), Staab, Joachim F. (author), and Brosius and Staab: Institut fur Publizistik, Johannes Gutenberg-Universtat Mainz, Germany; Mundorf: Department of Speech Communication, University of Rhode Island
Format:
Journal article
Publication Date:
1991
Published:
UK
Location:
Agricultural Communications Documentation Center, Funk Library, University of Illinois Box: 90 Document Number: C06470
James F. Evans Collection, This study provides a quantitative content analysis of the depictions of sex roles in the American news magazine Time and the West German news magazine Stern from 1969 to 1988. The underlying assumption of the study is that advertisements reflect changes in social reality. While most studies focus on explicit aspects of gender role depictions such as jobs, activities, interactions and situations, this content analysis also covers implicit aspects of role depictions such as posture, gestures, and facial expression. Some authors have claimed that these are powerful means of transmitting traditional sex role stereotypes of women as being submissive and of men being dominant. Results indicate that while there have been considerable changes in the explicit presentation of male and female roles, the implicit presentation remained quite consistent over the 20-year period. According to these findings, sex roles may have changed primarily on the surface, while nonverbal sex role stereotypes still linger on. Differences between the developments in Germany and the US are outlined. (original)
