Lawrence Berkeley National Laboratory, Hayward, CA, USA
A pocket-size portable particle size detector for diesel and cigarette smoke aerosols is being designed using particle size and composition methods. Aerodynamics, fluid properties, material composition and aerosol composition are taken into account. Testing methods for the design include using an impactor and virtual impactor with two quartz crystal resonators to determine particle composition ...
An Assessment of the Suitability of the Body and Adult Head Coils for Transmission during Paediatric Magnetic Resonance Imaging
G.R. Cook, M.J. Graves, F.J. Robb, D.J. Lomas
Department of Radiology, University of Cambridge, Cambridge, United Kingdom
General Electric Healthcare Coils, Aurora, Ohio, USA
MRI offers many advantages over other modalities and its lack of ionizing radiation is important for children, but can be limited by the radio-frequency (RF) coils available. This work calculates Specific Absorption Rate (SAR) and homogeneity of the RF transmit field (B1+) when imaging infants in adult coils. Two birdcage-type coils were loaded by a tissue model and their B1+ homogeneities ...
Investigation of Transport Phenomena in Nanochannels and its Applications in Energy Conversion using COMSOL Multiphysics
Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, Chutung, Hsinchu, Taiwan
Well‐designed and controlled nanochannels are ideal physical modeling systems to study fluidics in a precise manner. Electrokinetics refers to transport phenomena related to the non‐electroneutral EDL, which is created to neutralize the surface charges produced on surface. Surface charges are produced by the dissociation of surface functional groups. We created a mathematical model of a ...
R. Gerasch, J. Kulenkampff, J. Lippmann-Pipke
Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Research Site Leipzig, Leipzig, Germany
Our GeoPET camera is explicitly dedicated for and well capable of 4D monitoring of solute transport in dense geological material, c = c(x,y,z,t) [1-4]. We apply COMSOL Multiphysics® for reproducing our experiments and extracting parameter sets for our 4D problems [5-6]. By aligning simulated results of anisotropic diffusion in clay to our observations we are able to clearly differentiate and ...
Modelling of Reactive Non-Isothermal Mixture Flow and its Simulation in COMSOL Multiphysics® Software - new
V. Orava[1,2], O. Soucek, P. Cedula
Charles University in Prague, Prague, Czech Republic
Zurich University of Applied Sciences, Winterthur, Switzerland
I introduce a model of fluidized reactor which, in presence of heterogeneous platinum-based catalyst, decomposes liquid formic acid producing gaseous mixture of carbon dioxide and hydrogen as the product. I treat the physical system as a (Class II) mixture of four constituents - namely formic acid (FA), Platinum micro-pellets (Pt), carbon dioxide (CO_2) and hydrogen (H_2) - which can be, without ...
T. H. Hanley, H. T. D. Grigg, B. J. Gallacher
Newcastle University, Newcastle-Upon-Tyne, UK
Introducing a disorder into a finite periodic oscillatory system induces the presence of a 'trapped mode': a mode in which the displacement field is localised to the region of the disorder. A main inhibitor to MEMS resonators achieving a high quality (Q) factor is energy radiation through the support to the substrate. The trapped modes present a way to tune this to a minimal value. An initial ...
G. V. B. Lukasievicz, N. G. C. Astrath, L. C. Malacarne, M. L. Baesso, S. E. Bialkowski
Universidade Tecnológica Federal do Paraná, Toledo, PR, Brazil
Universidade Estadual de Maringá, Maringá, PR, Brazil
Utah State University, Logan, Utah, USA
The radiation force effects on the surface displacement can be calculated by solving the Navier-Stokes equation with appropriated boundary conditions. The surface deformation can be described by the radiation pressure as well as those forces due to gravity and surface tension. We used the photomechanical mirror (PM) method to measure the time-evolution of the nanometer deformation generated on ...
J. V. Jayaramakrishna, S. K. Thamida
National Institute of Technology Warangal, Warangal, Telangana, India
Chemical Vapor Deposition (CVD) finds application in many manufacturing processes of microelectronic devices and MEMS as a recent development. It is also useful for preparation of functionalized surfaces in microsensor kind of devices. The phenomena that is studied is deposition of a crystalline material for example Silicon from the gas phase substance such as Silicon Hydride (SiH4). The ...
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, ...
P. H. Nguyen , C. Rathje , G. J. Hornig , V. Jelic , C. Ropers , F. A. Hegmann ,
 University of Alberta, Edmonton, AB, Canada
 4th Physical Institute, University of Göttingen, Göttingen, Germany
Probing ultrafast processes over subpicosecond and picosecond time scales provides fundamental insight into the nature of materials. We have experimentally demonstrated terahertz (THz)-pulse-induced tunneling in a scanning tunneling microscope (THz-STM) to image surfaces with simultaneous nanometer spatial resolution and subpicosecond time resolution . However, the exact mechanism by which ...