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Full-Text Articles in Engineering
Momentum Of Particles From Time-Of-Flight Measurements, Joseph Best
Momentum Of Particles From Time-Of-Flight Measurements, Joseph Best
Senior Theses
In order to find the momentum of particles from time of flight measurements, I used a program called Geant4 to simulate experiments. I made a simple two detector setup, and I recreated a real world experiment. I spent a lot of time learning to code in C++ so I could use Geant4 correctly. I simulated these experiments shooting electrons, muons, and pions through the geometry and measured the time at two points in their flight. Subtracting the second time from the first gave me the time of flight distribution for each particle. I used ROOT to draw histograms of the …
Capacitance Measurements Of Defects In Solar Cells: Checking The Model Assumptions, Justin R. Davis
Capacitance Measurements Of Defects In Solar Cells: Checking The Model Assumptions, Justin R. Davis
Senior Theses
Capacitance measurements of solar cells are sensitive to minute changes in charge in the material. For that reason, capacitance is used in several methods to electrically characterize defects in the solar cell. Standard interpretations of capacitance rely on many assumptions, which, if wrong can skew the results. We explore possible alternative explanations for capacitance transitions, such as a non-ideal back contact and series resistance. Using Drive Level Capacitance Profiling measurements, a capacitance step is linked to a defect between the energy bands of a solar cell.
Power Maximization Of A Three-Phase Hydrokinetic Turbine, Matthew Carleson
Power Maximization Of A Three-Phase Hydrokinetic Turbine, Matthew Carleson
Senior Theses
As Earth`s expendable resources dwindle, the need for alternative, renewable energy sources grows. Out of this need, an old favorite source is rising in popularity: small water turbines. Water-driven turbines first began as a means for turning mills and eventually evolved into massive dams that can power whole regions. This project focused on the construction of, and testing the properties of, a small pico-hydro power turbine. By using compressed air to drive the turbine, a representation of the peak power output was measured, serving as a basis for determining the value of pico-power systems in regards to the world`s current …
Measuring Strain In Trusses, Spencer Metzsch
Measuring Strain In Trusses, Spencer Metzsch
Senior Theses
Strain is an important quantity in engineering design and materials science that relates the deformation of a material to its original length, through a percentage. Different materials exhibit particular qualities under loading, for example the amount of strain due to a certain magnitude of force, or the amount of strain that can be borne before failure. This experiment aims to compare the relative strengths of three common truss configurations by measuring the strain in their members under loading. The Queen’s post truss was found to be the best at minimizing strain under similar loading conditions.