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pro vyhledávání: '"H. Ludvigsen"'
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Autor:
K. Haarstad, G. H. Ludvigsen
Publikováno v:
Groundwater Monitoring & Remediation. 27:75-89
Pesticides in Norwegian ground water have been monitored since 1995. Here, we report data including 2004. The monitoring has focused on shallow ground water near agricultural fields (4 locations), on farm wells (22 locations), and on public waterwork
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dcd1d517347f68b631ba70168224be46
https://doi.org/10.1111/j.1745-6592.2007.00153.x
https://doi.org/10.1111/j.1745-6592.2007.00153.x
Publikováno v:
Proceedings.
A clear, mutual understanding of the field is an important part of well planning. The wellbore position is also important in well planning and especially in collision avoidance management. An overview in the form of a three-dimensional volume of the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7b54e530e209d0e1e3aedfbc0bba1741
https://doi.org/10.3997/2214-4609.201413404
https://doi.org/10.3997/2214-4609.201413404
Publikováno v:
Automatica. 40:73-85
This paper presents a new controller for swinging up the spherical pendulum. The problem of stabilizing the upright equilibrium of the spherical pendulum is typically solved in two steps: First, a controller is used to swing up the pendulum so that i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b790620313f28231831f0ab347f62175
https://doi.org/10.1016/j.automatica.2003.07.009
https://doi.org/10.1016/j.automatica.2003.07.009
Publikováno v:
Shiriaev, A S, Egeland, O, Ludvigsen, H & Fradkov, A L 2001, ' VSS-version of Energy Based Control for Swinging Up a Pendulum ', Systems & Control Letters, vol. 44, 1, pp. 45-56 . https://doi.org/10.1016/s0167-6911(01)00124-4
A new algorithm ensuring global attractivity of the upright (unstable) equilibrium of a pendulum, based on the variable structure system-version of the energy-speed-gradient method, is proposed. It is shown that global attractivity cannot be obtained
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5160b9db624dbaeb873bdb84c40d03c0
https://doi.org/10.1016/s0167-6911(01)00124-4
https://doi.org/10.1016/s0167-6911(01)00124-4
Publikováno v:
IFAC Proceedings Volumes. 32:2193-2198
The stabilization problem for the upright position of the controlled spherical pendulum is solved in the sense that all solutions Lend to the upright position. The suggested stabilizing regulator is a passive controller derived using the speed-gradie
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::70eb45bcc9f92425c4f61475791934cf
https://doi.org/10.1016/s1474-6670(17)56372-7
https://doi.org/10.1016/s1474-6670(17)56372-7
Publikováno v:
IFAC Proceedings Volumes. 31:303-308
We study here the problem of controlling continuous time nonlinear dynamical systems whose inputs live on a finite set. Our main concern is the situation when, due to technological or information transmition considerations, fast switching is not poss
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::14512558b0f3ba1e529216ca775b1f30
https://doi.org/10.1016/s1474-6670(17)40352-1
https://doi.org/10.1016/s1474-6670(17)40352-1
Publikováno v:
Applied optics. 35(21)
The construction of a passively stabilized external cavity diode laser operating at 780 nm is reported. The sensitivity of laser frequency to changes in air pressure was studied and subsequently eliminated. The relative frequency stability obtained w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=pmid________::7ae8336467113404975adad104f35368
https://pubmed.ncbi.nlm.nih.gov/21102825
https://pubmed.ncbi.nlm.nih.gov/21102825
Autor:
T. Ritari, J. Tuominen, H. Ludvigsen, J. C. Petersen, T. S�rensen, T. P. Hansen, H. R. Simonsen
Publikováno v:
Optics express. 12(17)
We demonstrate the high sensitivity of gas sensing using a novel air-guiding photonic bandgap fiber. The bandgap fiber is spliced to a standard single-mode fiber at the input end for easy coupling and filled with gas through the other end placed in a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5ce945e3406e03f62bb81f1f460f65c9
https://pubmed.ncbi.nlm.nih.gov/19483949
https://pubmed.ncbi.nlm.nih.gov/19483949
Publikováno v:
Varpula, T, Liedquist, L, Ludvigsen, H, Reyn, H & de Vreede, J 1991, ' Comparison of quantum-efficient silicon photodetectors with a cryogenic absolute radiometer at a laser wavelength of 543,5 nm ', Metrologia, vol. 28, no. 4, pp. 349-352 . https://doi.org/10.1088/0026-1394/28/4/007
Quantum-efficient silicon photodetectors of VSL (The Netherlands) and SP (Sweden), were compared with the cryogenic absolute radiometer of VTT (Finland). Agreement between the detectors was found at a level of 10-4 when the data of four silicon detec
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::008f42e1361557ab86313f1de10e2f8d
https://doi.org/10.1088/0026-1394/28/4/007
https://doi.org/10.1088/0026-1394/28/4/007