Zobrazeno 1 - 10
of 91
pro vyhledávání: '"Christine Böckmann"'
Publikováno v:
Remote Sensing, Vol 16, Iss 9, p 1576 (2024)
An Nd:YAG-based Raman lidar provides a mature technology to derive profiles of the optical properties of aerosols over a wide altitude range. However, the derivation of micro-physical parameters is an ill-posed problem. Hence, increasing the informat
Externí odkaz:
https://doaj.org/article/b8322417da9b468dba36b9f5d5862fb8
Publikováno v:
AppliedMath, Vol 2, Iss 4, Pp 547-573 (2022)
Extracting information about the shape or size of non-spherical aerosol particles from limited optical radar data is a well-known inverse ill-posed problem. The purpose of the study is to figure out a robust and stable regularization method including
Externí odkaz:
https://doaj.org/article/a7afb480baa74a7fb375c2a75ad34d2c
Publikováno v:
Remote Sensing, Vol 14, Iss 11, p 2578 (2022)
In this work, we present Raman lidar data (from a Nd:YAG operating at 355 nm, 532 nm and 1064 nm) from the international research village Ny-Ålesund for the time period of January to April 2020 during the Arctic haze season of the MOSAiC winter. We
Externí odkaz:
https://doaj.org/article/9d259fc99ded46299189ad94ebd3e7a3
Publikováno v:
Mathematics, Vol 9, Iss 9, p 1042 (2021)
We prove the logarithmic convergence rate of the families of usual and modified iterative Runge-Kutta methods for nonlinear ill-posed problems between Hilbert spaces under the logarithmic source condition, and numerically verify the obtained results.
Externí odkaz:
https://doaj.org/article/26415b0f5b434ade81381dea4188a271
Autor:
Upeksha Perera, Christine Böckmann
Publikováno v:
Mathematics, Vol 8, Iss 11, p 2074 (2020)
This paper further improves the Lie group method with Magnus expansion proposed in a previous paper by the authors, to solve some types of direct singular Sturm–Liouville problems. Next, a concrete implementation to the inverse Sturm–Liouville pr
Externí odkaz:
https://doaj.org/article/3dd83490ff994178bebbf70c10f13ccb
Autor:
Konstantina Nakoudi, Christoph Ritter, Christine Böckmann, Daniel Kunkel, Oliver Eppers, Vladimir Rozanov, Linlu Mei, Vasileios Pefanis, Evelyn Jäkel, Andreas Herber, Marion Maturilli, Roland Neuber
Publikováno v:
Remote Sensing, Vol 12, Iss 13, p 2112 (2020)
The impact of aerosol spatio-temporal variability on the Arctic radiative budget is not fully constrained. This case study focuses on the intra-Arctic modification of long-range transported aerosol and its direct aerosol radiative effect (ARE). Diffe
Externí odkaz:
https://doaj.org/article/36e0db7460ea47faa47e6aac493a6a4e
Publikováno v:
Mathematics, Vol 8, Iss 4, p 608 (2020)
In this paper, we present the convergence rate analysis of the modified Landweber method under logarithmic source condition for nonlinear ill-posed problems. The regularization parameter is chosen according to the discrepancy principle. The reconstru
Externí odkaz:
https://doaj.org/article/05e30569d23a4356b69c9f77b68ce7f8
Publikováno v:
EPJ Web of Conferences, Vol 237, p 08019 (2020)
An intense mineral dust event from the Saharan desert was observed over the Island of Barbados after a long-range transport over the Atlantic Ocean during SALTRACE Campaign in June 2014. We analyze data from a multi-wavelength Raman-lidar system of L
Externí odkaz:
https://doaj.org/article/1006c08e786e4f05b505eb85744db4d6
Autor:
Upeksha Perera, Christine Böckmann
Publikováno v:
Mathematics, Vol 7, Iss 6, p 544 (2019)
In this paper Lie group method in combination with Magnus expansion is utilized to develop a universal method applicable to solving a Sturm−Liouville problem (SLP) of any order with arbitrary boundary conditions. It is shown that the method has abi
Externí odkaz:
https://doaj.org/article/7fa37dcef13d4ca5a2a65465633eda23
Publikováno v:
Mathematics, Vol 7, Iss 5, p 419 (2019)
In this paper, we investigate the continuous version of modified iterative Runge–Kutta-type methods for nonlinear inverse ill-posed problems proposed in a previous work. The convergence analysis is proved under the tangential cone condition, a modi
Externí odkaz:
https://doaj.org/article/cfc993ff18d045fc81c3cd555f6fe5cb