Detlef Müller

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  • Ulla Wandinger, Detlef Müller, Christine Böckmann, Dietrich Althausen, Volker Matthias, Jens Bösenberg +16 others
  • 2002
[1] During the Lindenberg Aerosol Characterization Experiment (LACE 98) simultaneous measurements with ground-based and airborne lidars and with two aircraft equipped with aerosol in situ instrumentation were performed. From the lidar measurements, particle backscatter coefficients at up to eight wavelengths between 320 and 1064 nm and particle extinction(More)
We analyze in classical L q (R n)-spaces, n = 2 or n = 3, 1 < q < ∞, a singular integral operator arising from the lin-earization of a hydrodynamical problem with a rotating obstacle. The corresponding system of partial differential equations of second order involves an angular derivative which is not subordinate to the Laplacian. The main tools are(More)
We report on the feasibility of deriving microphysical parameters of bimodal particle size distributions from Mie-Raman lidar based on a triple Nd:YAG laser. Such an instrument provides backscatter coefficients at 355, 532, and 1064 nm and extinction coefficients at 355 and 532 nm. The inversion method employed is Tikhonov's inversion with regularization.(More)
  • J Schmidt, A Ansmann, J Bühl, H Baars, U Wandinger, D Müller +8 others
  • 2015
Key Points: • A new lidar technique to derive cloud microphysical properties is applied • A comparison of droplet sizes of two clouds complies with the Twomey effect • The influence of the vertical wind speed on cloud microphysics is investigated (2014), Dual-FOV Raman and Doppler lidar studies of aerosol-cloud interactions: Simultaneous profiling of(More)
Inversion with two-dimensional (2-D) regularization is a new methodology that can be used for the retrieval of profiles of microphysical properties, e.g., effective radius and complex refractive index of atmospheric particles from complete (or sections) of profiles of optical particle properties. The optical profiles are acquired with multiwavelength Raman(More)
Let H n be the Heisenberg group and let µ t be the normalized surface measure for the sphere of radius t in R 2n. Consider the maximal function defined by M f = sup t>0 |f * µ t |. We prove for n ≥ 2 that M defines an operator bounded on L p (H n) provided that p > 2n/(2n − 1). This improves an earlier result by Nevo and Thangavelu, and the range for L p(More)
This is a the first in a series of two articles devoted to the question of local solvability of doubly characteristic second order differential operators. Consider doubly characteristic differential operators of the form (0.1) L = m j,k=1 α jk (x)X j X k + lower order terms , where the X j are smooth real vector fields and the α jk are smooth complex(More)
This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may(More)
Consider doubly characteristic differential operators of the form L = m j,k=1 α jk (x)V j V k + lower order terms , where the V j are smooth real vector fields and the α jk are smooth complex coefficients forming a symmetric matrix A(x) := {α jk (x)} j,k. We say that L is essentially dissipative at x 0 , if there is some θ ∈ R such that e iθ L is(More)
Knowledge on the aerosol distribution in the Earth's atmosphere is not sufficient to calculate or even estimate the impact of aerosols on global and regional climate. One of the techniques to gain more knowledge in this field is advanced lidar remote sensing. Indeed, there are several problems connected with the retrieval of microphysical parameters of the(More)