Zobrazeno 1 - 10
of 62
pro vyhledávání: '"Leif Kristensen"'
Autor:
Leif Kristensen
Publikováno v:
MedieKultur: Journal of Media and Communication Research, Vol 5, Iss 10 (1989)
Externí odkaz:
https://doaj.org/article/e71d0616b85a416086dd7e8182ae97c9
Publikováno v:
Boundary-Layer Meteorology. 134:195-221
We have developed a simple, steady-state, one-dimensional second-order closure model to obtain continuous profiles of turbulent fluxes and mean concentrations of non-conserved scalars in a convective boundary layer without shear. As a basic tool we f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ae2592f78ab2cdabd7ec927ac9ba732b
https://doi.org/10.1007/s10546-009-9443-x
https://doi.org/10.1007/s10546-009-9443-x
Publikováno v:
Wind Energy. 7:37-46
Time series of mean wind speeds at several sites in Denmark have been used to estimate the power loss for wind turbines in the wind speed interval from where the operation has to stop at high winds to where a lower wind speed allows the operation to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::10c1b4c759f860108ccbd90a7e312c8d
https://doi.org/10.1002/we.106
https://doi.org/10.1002/we.106
Publikováno v:
Wind Energy. 6:321-331
The cup anemometer signal can be sampled in several ways to obtain the mean wind speed. Here we discuss the sampling of series of mean wind speeds from consecutive rotor rotations, followed by unweighted and weighted averaging. It is shown that the u
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c99074ea059cf383217f50d270c73ba4
https://doi.org/10.1002/we.85
https://doi.org/10.1002/we.85
Autor:
Leif Kristensen
Publikováno v:
Boundary-Layer Meteorology. 103:163-172
An analysis of cup-anemometer dynamics has been carried out inorder to determine whether the mean-wind velocity can have anegative bias. This would be contrary to the general belief thatcup anemometers always overspeed. Compared to prior analyses, th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::32c1a264e83595795557f62d78df50be
https://doi.org/10.1023/a:1014543307696
https://doi.org/10.1023/a:1014543307696
Publikováno v:
Wind Energy. 5:301-313
After having specified the basic vocabulary for simple statistics, which is recapitulated for N independent observations in section two, and which leads to the concept degrees of freedom equal to N, we proceed to the statistics of consecutive events
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::524a224c44552f5386536faee8ad4fd2
https://doi.org/10.1002/we.75
https://doi.org/10.1002/we.75
Publikováno v:
Boundary-Layer Meteorology. 135:181-183
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6bddd8d79c5cc3cd8b8277e7f188ff1c
https://doi.org/10.1007/s10546-010-9473-4
https://doi.org/10.1007/s10546-010-9473-4
Publikováno v:
Journal of Wind Engineering and Industrial Aerodynamics. 87:147-166
Wind-speed data from four sites in Denmark have been analyzed in order to obtain estimates of the basic wind velocity, defined as the 50 yr wind speed (10 min averages) under standard conditions, i.e., 10 m over a homogeneous terrain with the roughne
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6fd0d1f4c37c41e71565cbdce041492e
https://doi.org/10.1016/s0167-6105(00)00034-9
https://doi.org/10.1016/s0167-6105(00)00034-9
Autor:
J. C. Hansen, D. Kanellopoulos, Sten Tronæs Frandsen, P. Dunbabin, R. Hunter, A. Derrick, I. Antoniou, J.A. Dahlberg, Leif Kristensen, D. Douvikas, B. Chaviaropoulos, R. Ruffle, H. Aa. Madsen, G. Kapsalis
Publikováno v:
Wind Energy. 3:81-111
The lack of accurate methods for assessment of the productive capacity of wind power plants is becoming a bottleneck in an increasingly commercialized wind power industry. In this article the inherent components of performance assessment are identifi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e067ffa72d1038354210d075dc19c3ce
https://doi.org/10.1002/1099-1824(200004/06)3:2<81::aid-we31>3.0.co
https://doi.org/10.1002/1099-1824(200004/06)3:2<81::aid-we31>3.0.co
Autor:
Leif Kristensen
Publikováno v:
Wind Energy. 2:59-75
A short version of the history of the cup anemometer precedes a more technical discussion of the special features of this instrument. These include its extremely linear calibration and the non-linearity of its response to wind speed changes. A simple
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5aeae9711934114a5b3ca61b3d66a3f2
https://doi.org/10.1002/(sici)1099-1824(199901/03)2:1<59::aid-we18>3.0.co
https://doi.org/10.1002/(sici)1099-1824(199901/03)2:1<59::aid-we18>3.0.co