V. Mathur1, J. Li1, J. Therrien2, and W. D. Goodhue1
1Photonics Center, Department of Physics and Applied Physics, University of Massachusetts, Lowell, MA, USA
2Department of Electrical Engineering, University of Massachusetts, Lowell, MA, USA
Several methods have been demonstrated for depositing nanotubes on microstructures, ranging from using an atomic force microscope (AFM) tip for single tube manipulation to chemically pre-patterning the substrate. However, these techniques have a very low yield and poor reproducibility. Sorting techniques involving filtration and ultrasonication face similar issues. Recently, electric field ...
F. Jimenez, S. D. Ekpe, and S. K. Dew
Department of Electrical and Computer Engineering, University of Alberta, Edmonton, AB, USA
The plasma characteristics of a low pressure plasma discharge are dependent on the process conditions in a complicated manner. In order to understand this dependence, a comprehensive model, which takes into consideration the effects of the E x B field and gas heating on the transport of plasma particles, is required.In this work, a Monte Carlo - fluid - Poisson hybrid model is used in describing ...
Investigation on Sensor Fault Effects of Piezoelectric Transducers on Wave Propagation and Impedance Measurements
I. Buethe, C.-P. Fritzen
University of Siegen, Institute of Mechanics and Control Engineering-Mechatronics, Siegen, Germany
For active Structural Health Monitoring (SHM), one popular sensor type is the piezoelectric wafer active sensor (PWAS) due to its multi-purpose application as actuator and sensor and its low cost. It is used to generate a wave field, which interacts with the structure and is recorded by a second set of PWASs. This method is called acousto ultrasonics. The change in wave field from transducer ...
Comparison Between Phase Field and ALE Methods to Model the Keyhole Digging During Spot Laser Welding
V. Bruyere, C. Touvrey, P. Namy
CEA-DAM, Is-sur-Tille, France
SIMTEC, Grenoble, France
Nowadays, spot laser welding is a full-fledged part of industrial manufacturing and is routinely used due to its advantages. It generates very located temperature gradients, and therefore, induces small distortions in the pieces. The COMSOL Multiphysics® software is used to model the interaction stage of an isolated impact made with a Nd:YAG pulsed laser. The free surface evolution has been ...
J. Schumacher, P. Fideu, G. Ziegmann, and A. Herrmann
TU Clausthal-Institute of Polymere Materials and Plastic Engineering, Clausthal-Zellerfeld, Germany
CTC GmbH Stade, Stade, Germany
Faserinstitut Bremen e.V., Bremen, Germany
The current paper focuses on the creation of a consistent environment for the numerical prediction of the physical properties of polymer composite. A limitation factor for the successful simulation of composite processes is the correct estimation of the effective properties depending on several factors such as the constituents (fiber, polymer), the process setup. The numerical prediction of the ...
M. Sas, L. Bizon, and A. Krsjak
Siemens VDO Automotive, Frenstat, Czech Republic
When developing sensors with electrical output in automotive applications, different optimizations are taken into consideration; geometry shape, placement of the sensor, ambient conditions, chemical interaction, material composition, electrical components and their influence, accuracy, response and durability.These parameters and factors are designed, evaluated and simulated by proper CAD/CAE ...
Energy Exchange During Electron Emission from Carbon Nanotubes: Considerations on Tip Cooling Effect and Destruction of the Emitter
M. Dionne, S. Coulombe, and J. Meunier
Department of Chemical Engineering, McGill University, Montreal, Quebec, Canada
Murphy and Good general theory for electron emission from metal surfaces was used to predict the field-emission capabilities of ideal arrays of vertically aligned carbon nanotubes (VACNT). The Nottingham effect was taken into account in order to explain experimental observation of a localized cooling of the VACNT tips during field emission and the total destruction of very short emitters at ...
P. Seshaiyer, K. Nong, S. Garcia, E. Aulisa, and E. Swim
George Mason University, Farifax, VA, USA
United States Naval Academy, Annapolis, MD, USA
Texas Tech University, Lubbock, TX, USA
Sam Houston State University, Huntsville, TX, USA
Efficient modeling and computation of the nonlinear interaction of fluid with a solid undergoing nonlinear deformation has remained a challenging problem in computational science and engineering. Direct numerical simulation of the non-linear equations, governing even the most simplified fluid-structure interaction model depends on the convergence of iterative solvers which in turn relies heavily ...
Design and Development of Microsystems within a Corporate Research Environment by Utilizing Comsol Multiphysics
Corporate Research & Technologies
Alexander Frey received his M.A. degree from the University of Texas, Austin, in 1994, the Dipl. Phys. degree from the University of Wuerzburg, Germany in 1997 and the PhD from the Saarland University, Germany in 2010. In 1997 he joined Research Laboratories of Siemens working on the design of DRAM sensing circuits. In 1999 he joined Corporate Research, Infineon, Munich, Germany. He was engaged ...
N. Elabbasi, J. Bergstrom, and S. Brown
Veryst Engineering, LLC.
Peristaltic pumping is an inherently nonlinear multiphysics problem where the deformation of the tube and the pumped fluid are strongly coupled. We used COMSOL Multiphysics to investigate the performance of a 180 degree rotary peristaltic pump with two metallic rollers, and an elastomeric tube pumping a viscous Newtonian fluid. The model captures the peristaltic flow, the flow fluctuations ...