We present numerical simulations of a flow in a rapidly rotating cylinder subjected to a time-periodic forcing via axial oscillations of the sidewall. When the axial oscillation frequency is less than twice the rotation frequency, inertial waves in the form of shear layers are present. For very fast rotations, these waves approach the form of the characteristics predicted from the linearized in...

Sapphire nanopatterning is the key solution to GaN light emitting diode (LED) light extraction. One challenge is to etch deep nanostructures with a vertical sidewall in sapphire. Here, we report a study of the effects of two masking materials (SiO2 and Cr) and different etching recipes (the reaction gas ratio, the reaction pressure and the inductive power) in a chlorine-based (BCl3 and Cl2) ind...

250 words max) THE EFFECTS OF TIRE PRESSURE ON WHEELING EFFICIENCY Ian Denison, RPT; William C Miller PhD*, OT; Bonita J. Sawatzky, PhD^ BC Rehab, Vancouver Hospital, *School of Rehabilitation Science, UBC; ^Department of Orthopaedics, UBC 4255 Laurel Street, Vancouver, BC V5Z 2G9 Canada [email protected] INTRODUCTION This research project was undertaken to give clinicians information that...

BACKGROUND AND PURPOSE Endovascular treatments for aneurysms are being used more frequently in patients in the absence of a large body of information on their histopathological effects. This study determined the efficacy and histopathological effects of treatment of experimental aneurysms with Guglielmi detachable coils (GDC) or cellulose acetate polymer (CAP). METHODS Fourteen dogs had 13 te...

We investigated the aluminum nitride etching process for MEMS resonators. The process is based on Cl2/BCl3/Ar gas chemistry in inductively coupled plasma system. The hard mask of SiO2 is used. The etching rate, selectivity, sidewall angle, bottom surface roughness and microtrench are studied as a function of the gas flow rate, bias power and chamber pressure. The relations among those parameter...

Direct numerical simulations of unsteady natural convection in a differentially heated cavity with a thin fin of different lengths on a sidewall at the Raleigh number of 3.8 × 10 are performed. It is found that the fin length significantly impacts on the transient thermal flow around the fin and heat transfer through the finned sidewall in the early stage of the transient flow development. The ...

In this study, the performance of shred tire mixed with railway subgrade is evaluated to reduce environmental vibrations caused by trains’ passage. Since incorporating the Shred Tire seeds in soil affects on its shear strength and deformability parameters so, the first stage of the study was allocated to conducting a series of laboratory tests such as the unconfined compression test, and CBR an...

Electrostatic gap models for hierarchical MEMS circuit design are studied and parameterized through a series of finite element simulations and mathematical modeling. The models take into account the fringing fields which contribute large capacitances in low-aspect-ratio surface-micromachined devices. Angular orientation of electrode sidewall is taken into account to accommodate simulation of ma...