B. Lepers, S. Soldatov
Karlsruhe Institute of Technology, Institute for Pulsed Power and Microwave Technology, Karlsruhe, Germany
The use of high power microwave energy for ablation of contaminated concrete is a promising technique to speed up the dismantling of nuclear power plants. A coupled simulation using COMSOL Multiphysics® finite element software is performed by solving the electromagnetic wave equation at 2.45 GHz for a standard wave guide and a concrete block. The temperature field is obtained with the heat ...
Computing the Influence Functions of an Adaptive Optics Large Deformable Mirror: the Numerical Method and the Experimental Data
R. Biasi, D. Gallieni, A. Riccardi, R. Briguglio, C. Del Vecchio
Microgate Srl, Bolzano, Italy
ADS International Srl, Valmadrera (LC), Italy
National Institute for Astrophysics - Arcetri Astrophysical Observatory - Firenze, Italy
Adaptive Optics units are mounted on many large telescopes, thus enabling diffraction-limited astronomical images through compensation of the effects of atmospheric turbulence. The design of the control system of the Deformable Mirror includes a feed-forward block, aimed for increasing the efficiency of the control loop. Such a block is based on the stiffness matrix of the DM, defined as the ...
W. Kronast, U. Mescheder, B. Müller
Hochschule Furtwangen, Furtwangen, Germany
A new design concept for large (6 mm diameter) dynamically focusing silicon membrane mirrors using electrostatic actuation was realized. With this concept membrane buckling by residual compressive stress inside the membrane can be avoided. To eliminate the influence of residual stress (compressive or tensile) a membrane suspension with a novel stress relief design was developed by the use of ...
F. Greco, J. van Herle, A. Nakajo
FUELMAT Group, Institute of Mechanical Engineering, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
A solid oxide fuel cell (SOFC) is composed of four layers (anode, electrolyte compatibility layer and cathode) of different ceramic materials. The anode layer is produced by tape casting, the remaining layers are deposited by screen-printing. The layers are sintered together at high temperatures. During heating up and cooling down (manufacturing process), stresses are generated in the layers due ...
Study of the Process, Design, and Operating Parameters Effect on the Efficiency of the Process Mill - new
A. K. Farouk
Department of Mathematics & Natural Science, University of Stavanger, Sandnes, Rogaland, Norway
This study is to investigate the velocity pattern and the velocity magnitude of the cuttings that is being processed in the process mill as a result of the rotating hammers. The process mill consists of a horizontal cylindrical shell equipped with renewable liners and rotating hammers for milling of drill cuttings. An F.E model of the process mill was constructed using dimensions similar to ...
T. Gulati, A. K. Datta
Department of Biological & Environmental Engineering, Cornell University, Ithaca, NY, USA
Puffing of biomaterials involves mass, momentum and energy transport along with large volumetric expansion of the material. Development of physics-based models that can describe heat and moisture transport, rapid evaporation and large deformations can help understand the puffing process. In this context, a fundamentals based study of salt-assisted puffing of rice is described. A multiphase model ...
Infrasound Assessment of the Roller Compacted Concrete Dam: Case Study of the Portugues Dam in Ponce, PR
H. Diaz-Alvarez , V. P. Chiarito , S. McComas , M. H. McKenna ,
 U.S. Army Engineer Research and Development Center, Vicksburg, MS, USA
The U.S. Army Corps of Engineers is currently investigating the use of infrasound sensors to monitor the health of structures of interest. Infrasound is low-frequency (2-20 Hz) acoustic energy and is capable of propagating many kilometers from the source structure. Large infrastructure, such as dams, bridges, and buildings emit such signals at their natural or driven frequencies of vibration, ...
A. I. Elzawawy , J. D. Freels , F. G. Curtis [2, 3],
 Vaughn College of Aeronautics and Technology, East Elmhurst, NY, USA
 Oak Ridge National Laboratory, Oak Ridge, TN, USA
 University of Tennessee, Knoxville, TN, USA
The high flow rate within the HFIR cooling water flow channel causes the fuel plates to deflect which in turn, changes the coolant flow characteristics. This nonlinear feedback loop between the coolant and the fuel plate is the focus of the present simulation of the fluid-solid interaction between the coolant flow and the fuel plates to accurately predict the plate’s deflection using the Fluid ...
Numerical Modelling Of Moisture Related Mechanical Stress In Wooden Cylindrical Objects Using COMSOL: A Comparative Benchmark
H. Schellen, and J. Van Schijndel
Eindhoven University of Technology, Eindhoven, The Netherlands
For preservation of artefacts in a museum the indoor climate is often restricted to a very narrow interval for temperature, but most of all for relative humidity. In old buildings the museum conditions of artefacts, e.g. near cold walls, mostly are not in line with museum recommendations.To have an impression of indoor museum climates in old buildings, a large number of case studies were carried ...
C. Romao, and M. White
Dept. of Chemistry and Institute for Research in Materials
A series of 2-D finite element models of a ZrO2-ZrW2O8 composite system were created in COMSOL Multiphysics to study the effect of pores between the matrix (ZrO2) and filler (ZrW2O8) materials. Pores were modeled as ellipses concentric with the filler particles. Seventeen model geometries of varying microstructure were studied in order to determine correlations between microstructural ...