1,725,198 research outputs found
KMGlaser/Kienle-et-al: Kienle_et_al_2021
No full textR script for data analysis and visualization in Kienle et al
Is There Still a Syrian State? Four Questions to Eberhard Kienle
No full textcontribution à un site webResearch Professor at CERI Sciences Po, Eberhard Kienle currently works on the dislocation of states in the Middle East and on the regional political order, as well as on the link between economic liberalisation and political transformations in the region. He has agreed to help us understand the current status of the Syrian state. Is there still a state in Syria? Interview by Miriam Périer, CER
Is There Still a Syrian State? Four Questions to Eberhard Kienle
No full textcontribution à un site webResearch Professor at CERI Sciences Po, Eberhard Kienle currently works on the dislocation of states in the Middle East and on the regional political order, as well as on the link between economic liberalisation and political transformations in the region. He has agreed to help us understand the current status of the Syrian state. Is there still a state in Syria? Interview by Miriam Périer, CER
Solutions to the radiative transfer equation with GPU-accelerated Monte Carlo simulations : applied to applications such as surface recognition and determination of the optical properties of scattering media
No full textThis thesis presents the results of six research articles that use Monte Carlo simulations to model light propagation in scattering media for various applications.
In "Determination of the optical properties of three-layered turbid media in the time domain using the P₃ approximation" (S. Geiger, D. Reitzle, A. Liemert, and A. Kienle, 2019), the inverse problem of time-resolved solutions to the radiative transfer equation is investigated. Monte Carlo simulations serve as a reference for the spherical harmonics approximation. The study finds that the P₃ approximation offers a significant advantage over the diffusion approximation.
"Semianalytical solution for the transient temperature in a scattering and absorbing slab consisting of three layers heated by a light source" (D. Reitzle, S. Geiger, A. Liemert, and A. Kienle, 2021) presents and validates a semi-analytical solution for the time-dependent heat distribution in a three-layered, laterally infinite scattering and absorbing slab illuminated by an obliquely incident, collimated beam of light.
In "Solutions for single-scattered radiance in the semi-infinite medium based on radiative transport theory" (A. Liemert, S. Geiger, and A. Kienle, 2021), solutions for the single-scattered radiance in the semi-infinite medium are presented and validated against Monte Carlo simulations, showing perfect agreement.
The article "Single scattering models for radiative transfer of isotropic and cone-shaped light sources in fog" (S. Geiger, A. Liemert, D. Reitzle, M. Bijelic, A. Ramazzina, W. Ritter, F. Heide, and A. Kienle, 2023) presents improvements to the single scattering solution of the radiative transfer equation in indefinitely spaced scattering fog. Both isotropic and cone-shaped light sources are investigated. The analytical solutions demonstrate perfect agreement with the Monte Carlo simulations. The scattering phase function for both the analytical solutions and the Monte Carlo simulations accounts for the particle distribution of the fog droplets. In the examples considered, the single scattering solution serves as a very good approximation compared to the solution that includes all scattering events.
Improvements to topography reconstruction of volume scattering objects using structured light are detailed in "Improved topography reconstruction of volume scattering objects using structured light" (S. Geiger, P. Hank, and A. Kienle, 2022). We simulate light propagation inside the object and use this information to correct the phase of the structured light, taking into account the projection and detection directions. This leads to a significant improvement in the reconstructed geometry.
In "Improved topographic reconstruction of turbid media in the spatial frequency domain including the determination of the reduced scattering and absorption coefficients" (S. Geiger, P. Hank, and A. Kienle, 2023), we improve the approach to reconstruct unknown optical properties and correct the surface geometry in a single step.
In addition to these articles, we provide an introduction that motivates the use of the radiative transfer equation and GPU-accelerated Monte Carlo simulations for the applications presented
Measurements of rotational energy transfer and quenching in OH A 2[Sigma]+, v'=0 at elevated temperature
Get PDFLee MP, Kienle R, Kohse-Höinghaus K. Measurements of rotational energy transfer and quenching in OH A 2[Sigma]+, v'=0 at elevated temperature. Applied Physics B. 1994;58(6):447-457.Total rotational energy transfer rates have been measured at 1330 K for specific rotational levels in the OH A 2[Sigma]+, v'=0 state in collisions with H 20. Rotational levels ranging from N'=0 to 15 were studied. Measurements were performed in the post-flame region of a stoichiometric H2/O2/He flame operating at 25 mbar. Quenching rates following excitation of individual upper rotational states were also measured. The RET and quenching rates both exhibit monotonic decreases with increasing rotational quantum number
Proceedings - 13th IEEE International Symposium on Web Systems Evolution, WSE 2011: Foreword
No full textL’Egypte est-elle un Etat fragile ?
No full textDans son récent ouvrage intitulé Egypt: A Fragile Power (Abingdon/ New York, N.Y., Routledge, 2021), Eberhard Kienle s’intéresse au régime autoritaire égyptien, aux nombreuses difficultés économiques et à la dépendance du pays à l’aide internationale et dresse une analyse des caractéristiques politiques et économiques contemporaines de cet État avec une perspective historique. Eberhard Kienle remet en question certaines idées préconçues autour du rôle des acteurs « laïques », « islamiques » et « révolutionnaires » et il interroge des notions telles que la “modernisation”, la “réforme économique” et la stabilité politique. Entretien avec Eberhard Kienle, par Miriam Périer
Israël, Gaza et leurs voisins arabes
No full textInternational audienceEntretien avec Eberhard Kienle. Propos recueillis par Corinne Deloy, CER
Experiment und Modellentwicklung zum Einfluß des stoßinduzierten Energietransfers auf die laserinduzierte Fluoreszenz von OH (A 2 Sigma +) unter Flammenbedingungen
No full textKienle R. Experiment und Modellentwicklung zum Einfluß des stoßinduzierten Energietransfers auf die laserinduzierte Fluoreszenz von OH (A 2 Sigma +) unter Flammenbedingungen. Stuttgart: Inst. für Physikal. Chemie der Verbrennung, Deutsche Forschungsanstalt für Luft- und Raumfahrt; 1994
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