Due to their high torque-to-loss ratio, permanent magnet synchronous machines PMSM) have received increasing attention in automotive applications over the past decade. Because of this unique characteristics, many applications have utilized PMSM. In addition to high efficiency, quiet operation of the machines is desirable in automotive, naval and military applications. In order to operate at …
Category Archive: Engineering
Engineering Paper
Mar
13
High precision surface control of flexible space reflectors
Flexible reflectors are used for a number of applications in space, including resource monitoring, weather analysis, hazard assessment, reconnaissance, and imaging. With the rapid advances in deployable membrane and mesh antenna technologies, the feasibility of developing large, lightweight reflectors has greatly improved, though high-precision surface control is needed in order to achieve the required surface …
Mar
13
Vertically aligned carbon nanofiber microbrush array & single multi-walled carbon nanotube electrode for electrophysiological probing of electrically active cells
The elucidation of learning and memory and of the pathophysiology of Parkinsons Disease PD), Muscular Dystrophy MD), and severe episodic depression are important goals driving contemporary neuroscience. However, this research and the development of long-term neuroprostheses for treating disorders of the human nervous system have been hindered by the unavailability of low-impedance, high resolution, solid-state …
Mar
13
RBF based responsive stimulators to control epilepsy
Deep Brain Simulation (DBS) has received attention in the scientific community for its potential to suppress epileptic seizures. To date, DBS has only achieved marginal positive results. We believe that a highly complex possibly chaotic (HPC) biologically inspired stimulation is superior to periodic stimulation. Using Radial Basis Functions (RBFs), we modeled interictal and postictal time …
Mar
13
Time domain simulation of soil-retaining wall interaction in elastic and elastoplastic soils
Retaining wall systems are widely used throughout seismically active areas like California. They represent key elements of important constructed facilities and their potential damage is connected with significant physical and economic consequences. While their design for static applications has been practiced by many sectors, their seismic design has not been extensively developed with a lack …
Mar
13
Electrohydrodynamic atomization for improved macromolecular drug delivery
With advances in drug research, the use of biological therapeutics is becoming a reality. Unfortunately, methods for processing and delivering these fragile macromolecules often limit their therapeutic potential. For this dissertation, we explore the aerosolization of macromolecules by way of electrohydrodynamic atomization (EHDA) and how this method can be used to process and deliver therapeutics. …
Mar
13
Molecular Compositions, Structures, and Acid Properties of Silica-alumina, Silicate, and Aluminosilicate Catalysts and Supports
Silica-aluminas, silicates, and aluminosilites zeolites) have been widely used as heterogeneous catalysts and supports, because compared to homogeneous catalysts, their solid-acid properties are often desirable for selectivity and separation reasons. However, despite decades of use, much remains unknown with regard to the molecular origins of their acidities and how they may be controlled. For zeolites, …
Mar
13
Evolving and confirming estimated parameters based on structural health monitoring data
A new Evolving-Confirmed process ECP) is introduced that utilizes construction loads for more accurate baseline condition estimations in medium or large civil structures. The structural response, measured during construction, serves as the ECP input to estimate the initially undamaged state, or baseline condition of the structure. Parameters are estimated and evolved over a sequence of …
Mar
13
Investigation of a novel manufacturing technique for two-dimensional machining of Polycrystalline Cubic Boron Nitride (PCBN) tools
The Laser/Water-Jet (LWJ) hybrid machining system, introduced and developed by the Iowa State University’s Laboratory for Lasers, MEMS, and Nanotechnology, was applied to overcome the major deficiencies associated with current EDM and laser machining techniques for shaping Polycrystalline Cubic Boron Nitride (PCBN) cutting tools from the blanks. For PCBN, the purpose of water in LWJ …
Mar
13
Development of a Probe-Based Proactive coordinated Ramp Metering Approach
In this thesis, a new proactive coordinated ramp metering approach is developed based on speed data obtained from vehicle probe technology (or in future from IntelliDrive). The objective function formulated in this approach minimizes the total vehicular travel time and delay experienced by vehicles on the freeway and on-ramps. A rolling horizon framework is formulated …