Zobrazeno 1 - 10
of 64
pro vyhledávání: '"Kari Lumme"'
Autor:
Kari Lumme, Antti Penttilä
Publikováno v:
Journal of Quantitative Spectroscopy and Radiative Transfer. 112:1741-1746
We propose an orientation averaging scheme which we call optimal cubature on the sphere to be used in light scattering computations. The cubature points are optimally arranged on the sphere to produce non-biased and fast convergence in scattering pro
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2d91639bdf9672117102a6ac540ddedd
https://doi.org/10.1016/j.jqsrt.2011.02.001
https://doi.org/10.1016/j.jqsrt.2011.02.001
Autor:
Kari Lumme, Antti Penttilä
Publikováno v:
Journal of Quantitative Spectroscopy and Radiative Transfer. 112:1658-1670
We analyze both the intensity and linear polarization of cosmic dust particles by using the physically exact superposition T-matrix method in a fixed orientation for various aggregates of spheres and DDA for the aggregates of Gaussian random spheres.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c0d646df9344a25561c6001d1f4eff5a
https://doi.org/10.1016/j.jqsrt.2011.01.016
https://doi.org/10.1016/j.jqsrt.2011.01.016
Publikováno v:
Journal of Quantitative Spectroscopy and Radiative Transfer. 111:1748-1772
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c681d244a1ecbd7fd191f126c8bd04fa
https://doi.org/10.1016/j.jqsrt.2010.04.022
https://doi.org/10.1016/j.jqsrt.2010.04.022
Autor:
Kari Lumme, Antti Penttilä
Publikováno v:
Journal of Quantitative Spectroscopy and Radiative Transfer. 110:1993-2001
Numerical wave-optical methods for light scattering simulations are used to asses the effect of porosity on the optical properties of paper coating. Both constant porosity profile and media with porosity contrast between layers at different depths ar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a45e92b516f3d0a5caa6b875ddd9cb96
https://doi.org/10.1016/j.jqsrt.2009.05.009
https://doi.org/10.1016/j.jqsrt.2009.05.009
Publikováno v:
Waves in Random and Complex Media. 17:85-98
Scots pine (Pinus sylvestris L.) has the widest distribution of any pine and is one of the most important timber trees in Europe and one of the main species of boreal forest, which have an important role in climate change studies. The leaf area index
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::801f778d4620b57f905c8ba398d80131
https://doi.org/10.1080/17455030601011597
https://doi.org/10.1080/17455030601011597
Autor:
Evgenij Zubko, Jussi Rahola, Karri Muinonen, Kari Lumme, Bruce T. Draine, Maxim A. Yurkin, Yuri Shkuratov, Alfons G. Hoekstra, Antti Penttilä
Publikováno v:
Journal of Quantitative Spectroscopy & Radiative Transfer, 106, 417-436. Elsevier
The use of the discrete dipole approximation (DDA) method in wave optical scattering simulations is growing quite fast. This is due to the fact that the current computing resources allow to apply DDA to sufficiently large scattering systems. The adva
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d02e8e32918476653c8e8723d83422d2
https://hdl.handle.net/11245/1.276766
https://hdl.handle.net/11245/1.276766
Publikováno v:
Jääskeläinen, A, Peiponen, K-E, Tapper, U, Kauppinen, E & Lumme, K 2002, ' Effective refractive index of calcium carbonate pigment slurries by a surface-plasmon-resonance sensor ', Dyes and Pigments, vol. 52, no. 1, pp. 15-21 . https://doi.org/10.1016/S0143-7208(01)00067-5
A surface-plasmon-resonance sensor was applied in the measurement of the effective refractive index of highly turbid calcium carbonate pigment slurries. Information on the absorption of the pigment slurries as a function of the concentration was obta
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cc7a29a58ef028b8ab42b1a6320e6575
https://cris.vtt.fi/en/publications/68b9b4c5-a571-49a7-a118-8c7837d9929f
https://cris.vtt.fi/en/publications/68b9b4c5-a571-49a7-a118-8c7837d9929f
Autor:
Anssi Jääskeläinen, Unto Tapper, Olivier Richard, Kari Lumme, Jukka Räty, Esko I. Kauppinen, Kai-Erik Peiponen
Publikováno v:
Peiponen, K-E, Jääskeläinen, A, Räty, J, Oliver, R, Tapper, U, Kauppinen, E & Lumme, K 2000, ' Reflectance study of pigment slurries ', Applied Spectroscopy, vol. 54, no. 6, pp. 878-884 . https://doi.org/10.1366/0003702001950256
Optical properties of nonabsorbing turbid slurries were studied by reflectometric techniques. Two types of industrial slurries were investigated. The one slurry contained spherical plastic pigments, whereas the other consisted of irregularly shaped c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fa23a3c2befbf0ee4aacd7e78d89007c
https://doi.org/10.1366/0003702001950256
https://doi.org/10.1366/0003702001950256
Autor:
Heikki Laitinen, Kari Lumme
Publikováno v:
Journal of Quantitative Spectroscopy and Radiative Transfer. 60:325-334
The T -matrix method has almost exclusively been applied to rotationally symmetric particles. We have implemented a computer code which can handle any homogeneous, starshaped particle. General T -matrix expressions are presented in a form suitable fo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::69fab4f08babd2cf3dbf15f8f5369009
https://doi.org/10.1016/s0022-4073(98)00009-0
https://doi.org/10.1016/s0022-4073(98)00009-0
Publikováno v:
Journal of Quantitative Spectroscopy and Radiative Transfer. 57:197-205
We examine the validity regime of the ray optics approximation for Gaussian random spheres. The Gaussian sphere is fully characterized by the mean and the covariance function of the radius. We calculate the first two moments of the total, Gaussian cu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::150947a41057c7823440d6763c8200d8
https://doi.org/10.1016/s0022-4073(96)00127-6
https://doi.org/10.1016/s0022-4073(96)00127-6