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Featured submissions
January 2019
- The latest volume of Desert Plants, a special issue called Thirty-Seven Years on a Mountain Trail: Vascular Flora and Flowering Phenology of the Finger Rock Canyon Watershed, Santa Catalina Mountains, Arizona.
- New geologic maps and data from the Arizona Geological Survey Document Repository.
- A report on the Research Practices of Indigenous Studies Scholars at the University of Arizona.
- Honors College Theses from Fall 2018 graduates.
- Proceedings from the 2018 Critical Librarianship and Pedagogy Symposium.
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Recently Added
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International Telemetering Conference Proceedings, Volume 54 (2018)(International Foundation for Telemetering, 2018-11)
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A SURVEY OF OPTIMAL PACKET SCHEDULING METHODS FOR ENERGY HARVESTING COMMUNICATIONS(International Foundation for Telemetering, 2018-11)
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AKARI mid-infrared slitless spectroscopic survey of star-forming galaxies at z ≲ 0.5(EDP SCIENCES S A, 2018-10-18)Context. Deep mid-infrared (MIR) surveys have revealed numerous strongly star-forming galaxies at redshift z less than or similar to 2. Their MIR fluxes are produced by a combination of continuum and polycyclic aromatic hydrocarbon (PAH) emission features. The PAH features can dominate the total MIR flux, but are difficult to measure without spectroscopy. Aims. We aim to study star-forming galaxies by using a blind spectroscopic survey at MIR wavelengths to understand evolution of their star formation rate (SFR) and specific SFR (SFR per stellar mass) up to z similar or equal to 0.5, by paying particular attention to their PAH properties. Methods. We conducted a low-resolution (R similar or equal to 50) slitless spectroscopic survey at 5-13 mu m of 9 mu m flux-selected sources (> 0.3 mJy) around the north ecliptic pole with the infrared camera (IRC) onboard AKARI. After removing 11 AGN candidates by using the IRC photometry, we identify 48 PAH galaxies with PAH 6.2, 7.7, and 8.6 mu m features at z < 0.5. The rest-frame optical-MIR spectral energy distributions (SEDs) based on CFHT and IRC imaging covering 0.37-18 mu m were produced, and analysed in conjunction with the PAH spectroscopy. We defined the PAH enhancement by using the luminosity ratio of the 7.7 mu m PAH feature over the 3.5 mu m stellar component of the SEDs. Results. The rest-frame SEDs of all PAH galaxies have a universal shape with stellar and 7.7 mu m bumps, except that the PAH enhancement significantly varies as a function of the PAH luminosities. We identify a PAH-enhanced population at z greater than or similar to 0.35, whose SEDs and luminosities are typical of luminous infrared galaxies. They show particularly larger PAH enhancement at high luminosity, implying that they are vigorous star-forming galaxies with elevated specific SFR. Our composite starburst model that combines a very young and optically very thick starburst with a very old population can successfully reproduce most of their SED characteristics, although we cannot confirm this optically think component from our spectral analysis.
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Real-time Processing and Integrated Monitoring Technology for Telemetry Multi-channel Digital Video(International Foundation for Telemetering, 2018-11)In flight test telemetry digital video real-time monitoring, some technical problems about single function of the video playback software, needing a dedicated player software (poor extensibility) and lacking the necessary fault diagnosis methods are analyzed.Intelligent playback technology, component video playback plug-in, ground full-link real-time status monitoring and fault diagnosis technology are adopted to realize real-time monitoring telemetry multi-channel digital video under different airborne acquisition systems.Multi-channel video images can be on-demand inserted in any flight test subjects monitoring software.At the same time, it can realize visual real-time status monitoring of the video links of each aircraft.The flight test results show that this technology fully meets the new requirements of the new model test flight for real-time monitoring of video, and greatly improves the quality and efficiency of real-time monitoring of telemetry digital video of the flight test.
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ASSESSMENT OF HANDLING QUALITIES OF LIGHT COMBAT AIRCRAFT (LCA-TEJAS) IN AIR-TO-AIR ATTACK MODE BY ANALYSIS OF HEAD-UP DISPLAY (HUD) VIDEO OF THE CHASE AIRCRAFT(International Foundation for Telemetering, 2018-11)This Paper is intended to assess the handling quality of LCA-Tejas during air to air attack mission. In this paper handling quality of LCA in air-to-air attack mode is being assessed using image processing techniques. As a part of flight test program of LCA Tejas we have presented a methodology to assess the handling quality of LCA by detecting the target aircraft in every frame of the HUD video of the chase aircraft during an air-to-air attack mission. Based on the detection of the aircraft in every frame of the HUD video, percentage of time the aircraft is being targeted during a given test point is arrived at. This percentage is an indicator of the handling quality of the aircraft and is used to assess the ease with which the pilot can aim at the enemy aircraft while in close combat.
