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Maschler Tobias Strmer-Stephan Bastian Morhard Jrg Stegmaier Thomas Tilebein Meike Griepentrog Hans W. 《Annals of Operations Research》2022,314(2):577-600
Annals of Operations Research - Selecting a vegetation layer design goes along with determining its future irrigation need. Therefore, it is essential to take a design decision that is minimising... 相似文献
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J. Bonse A. Hertwig R. Koter M. Weise U. Beck P. Reinstädt M. Griepentrog J. Krüger M. Picquart E. Haro-Poniatowski 《Applied Physics A: Materials Science & Processing》2013,111(1):9-14
Portable X-ray Fluorescence Spectrometry (pXRF) was used to survey 33 works in Washington and Lee University’s collection of Louise Herreshoff’s paintings. This work was done both to support a condition assessment of the paintings and their pigments and to determine which paintings might be appropriate for further study in the context of ongoing key synchrotron research into the degradation mechanisms of cadmium sulfide yellow pigment (CdS). 相似文献
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Thomas Hübert Hilke Hattermann Michael Griepentrog 《Journal of Sol-Gel Science and Technology》2009,51(3):295-300
Silica coatings filled with nanoscaled inorganic fullerene-like tungsten disulphide (IF-WS2) have been prepared through a sol–gel process on stainless steel substrates, and the structure and mechanical properties
have been investigated. The precursor was prepared from a mixture of colloidal silica, 3-glycidoxypropyltrimethoxysilane (GLYMO),
water and ethanol, adjusted to pH 4 with HNO3. In this solution WS2 is dispersed and in some cases immediately before coating ethylenediamine (ED) is added. The stainless steel substrates are
dip-coated, dried in air and heat-treated in the temperature range of either 150–360 °C in air or up to 900 °C in vacuum.
The solidification process is followed by differential thermal analysis (DTA). The resulting brown coloured coatings have
a thickness of 1.5–4 μm. Scanning electron microscopy investigations (SEM) show that the WS2 nanoparticles are embedded as small aggregates in a hybrid silica matrix. X-ray diffraction (XRD) measurements prove that
most of the tungsten disulphide embedded in the matrix can be protected against oxidation even after curing the samples at
temperatures up to 900 °C. Hardness and modulus of the hybrid silica films were measured through an instrumented indentation
test. Increasing the temperature of the heat treatment yields an increase of hardness from 0.3 to 1 GPa and of modulus from
3 to 17 GPa. The amount of up to 10 wt.% WS2 in the coatings has no remarkable influence on hardness and modulus of the samples. 相似文献
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Marco Alvisi Markus Blome Michael Griepentrog Vasile-Dan Hodoroaba Peter Karduck Marco Mostert Michele Nacucchi Mathias Procop Martin Rohde Frank Scholze Peter Statham Ralf Terborg Jean-Francois Thiot 《Microscopy and microanalysis》2006,12(5):406-415
A calibration procedure for the detection efficiency of energy dispersive X-ray spectrometers (EDS) used in combination with scanning electron microscopy (SEM) for standardless electron probe microanalysis (EPMA) is presented. The procedure is based on the comparison of X-ray spectra from a reference material (RM) measured with the EDS to be calibrated and a reference EDS. The RM is certified by the line intensities in the X-ray spectrum recorded with a reference EDS and by its composition. The calibration of the reference EDS is performed using synchrotron radiation at the radiometry laboratory of the Physikalisch-Technische Bundesanstalt. Measurement of RM spectra and comparison of the specified line intensities enables a rapid efficiency calibration on most SEMs. The article reports on studies to prepare such a RM and on EDS calibration and proposes a methodology that could be implemented in current spectrometer software to enable the calibration with a minimum of operator assistance. 相似文献
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We prove local existence, uniqueness, Hölder regularity in space and time, and smooth dependence in Hölder spaces for a general class of quasilinear parabolic initial boundary value problems with nonsmooth data. As a result the gap between low smoothness of the data, which is typical for many applications, and high smoothness of the solutions, which is necessary for the applicability of differential calculus to abstract formulations of the initial boundary value problems, has been closed. The theory works for any space dimension, and the nonlinearities in the equations as well as in the boundary conditions are allowed to be nonlocal and to have any growth. The main tools are new maximal regularity results (Griepentrog in Adv Differ Equ 12:781–840, 1031–1078, 2007) in Sobolev–Morrey spaces for linear parabolic initial boundary value problems with nonsmooth data, linearization techniques and the Implicit Function Theorem. 相似文献
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