Results 21 to 30 of about 2,012 (205)

Search for Rapid Changes in the Visible-Light Corona during the 21 June 2001 Total Solar Eclipse [PDF]

, 2010
Some 8000 images obtained with the SECIS fast-frame CCD camera instrument located at Lusaka, Zambia, during the total eclipse of 21 June 2001 have been analyzed to search for short-period oscillations in intensity that could be a signature of solar ...
Buczylko, A., Keenan, F. P., Phillips, K. J. H., Rudawy, P., Williams, D. R.   +4 more
core   +3 more sources

Stable Emissions from a Four-Rod Nd:YAG Solar Laser with ±0.5° Tracking Error Compensation Capacity

Photonics, 2023
Conventional solar-pumped lasers rely on expensive and highly accurate solar tracking systems, which present a significant economic barrier to both solar laser research and practical applications.
Miguel Catela, Dawei Liang, Joana Almeida, Hugo Costa, Dário Garcia, Bruno D. Tibúrcio, Emmanuel Guillot, Cláudia R. Vistas   +7 more
doaj   +1 more source

Mrk 421, Mrk 501, and 1ES 1426+428 at 100 GeV with the CELESTE Cherenkov Telescope [PDF]

, 2006
We have measured the gamma-ray fluxes of the blazars Mrk 421 and Mrk 501 in the energy range between 50 and 350 GeV (1.2 to 8.3 x 10^25 Hz). The detector, called CELESTE, used first 40, then 53 heliostats of the former solar facility "Themis" in the ...
A. Jacholkowska, Aharonian, Aharonian, Aharonian, Aharonian, B. Lott, Baillon, Bernlöhr, Błazejowski, D. A. Smith, D. Dumora, de Naurois, Djannati-Ataï, Dwek, E. Brion, E. Durand, E. Nuss, F. Münz, F. Piron, Gehrels, Giebels, Goret, H. Manseri, Hartman, Hayes, Horan, J. Bussons Gordo, J. Holder, J. Lavalle, Kataoka, Katarzynski, Kertzman, Lavalle, Massaro, Mukherjee, Oser, P. Bruel, P. Eschstruth, P. Espigat, Paré, Piron, R. Britto, R. C. Rannot, R. Le Gallou, T. Reposeur, T. Sako, Tavecchio   +46 more
core   +4 more sources

Review of heliostat calibration and tracking control methods

Solar Energy, 2020
Abstract Large scale central receiver systems typically deploy between thousands to more than a hundred thousand heliostats. During solar operation, each heliostat is aligned individually in such a way that the overall surface normal bisects the angle between the sun’s position and the aim point coordinate on the receiver.
Sattler, Johannes, Röger, Marc, Schwarzbözl, Peter, Buck, Reiner, Macke, Ansgar, Raeder, Christian, Göttsche, Joachim   +6 more
openaire   +3 more sources

Analysis of tracking characteristics of a heliostat field using a graphical ray tracing procedure

e-Prime: Advances in Electrical Engineering, Electronics and Energy, 2023
The tracking requirements of all heliostats in a field are not the same, and they vary according to day, time, and latitude. In this work, a graphical ray tracing (GRT) based model is developed and demonstrated with two-axis Azimuth-Elevation (AE) and ...
Sainath A. Waghmare, Bhalchandra P. Puranik   +1 more
doaj   +1 more source

OSETI with STACEE: A Search for Nanosecond Optical Transients from Nearby Stars [PDF]

, 2009
We have used the STACEE high-energy gamma-ray detector to look for fast blue-green laser pulses from the vicinity of 187 stars. The STACEE detector offers unprecedented light-collecting capability for the detection of nanosecond pulses from such lasers ...
A. Jarvis, C. Mueller, C.E. Covault, D.A. Williams, D.D. Driscoll, D.M. Gingrich, D.S. Hanna, Hetesi Z., Holder J., J. Ball, J. Kildea, J. Zweerink, J.E. Carson, K. Ragan, Mukherjee R., P. Fortin, R. Mukherjee, R.A. Ong, T. Lindner   +18 more
core   +1 more source

Application of CMAC Neural Network to Solar Energy Heliostat Field Fault Diagnosis

International Journal of Photoenergy, 2013
Solar energy heliostat fields comprise numerous sun tracking platforms. As a result, fault detection is a highly challenging problem. Accordingly, the present study proposes a cerebellar model arithmetic computer (CMAC) neutral network for automatically ...
Neng-Sheng Pai, Her-Terng Yau, Tzu-Hsiang Hung, Chin-Pao Hung   +3 more
doaj   +1 more source

Seven-Rod Pumping Concept for Highly Stable Solar Laser Emission

Energies, 2022
A seven-rod solar laser head was conceptualized and numerically studied to improve the tracking error compensation capacity and power stability in end-side-pumping schemes.
Hugo Costa, Dawei Liang, Joana Almeida, Miguel Catela, Dário Garcia, Bruno D. Tibúrcio, Cláudia R. Vistas   +6 more
doaj   +1 more source

Heliostat Cluster Control for the Solar Tower Power Plant Based on Leader-Follower Strategy

IEEE Access, 2019
As one of the most promising power generation technologies using renewable energy sources, and the solar thermal electric power generation may be developed to alleviate the energy crisis.
Qiyue Xie, Yixing Xiao, Xiaoli Wang, Daifei Liu, Zhongli Shen   +4 more
doaj   +1 more source

Evaluation of Flow Parameters around Tracking Solar Collectors with Different Collector Geometry and Different Operation Conditions [PDF]

Engineering and Technology Journal, 2014
In the current study, the flow parameters around the tracking solar collectors were evaluated. Different site conditions with different tracking solar collector's geometry are combined and investigated. Site conditions included different wind loading due
Khalid Hameed Hussein
doaj   +1 more source