Python Automation of a Hanle Effect Experimental Apparatus Darin Waterbury Project Mentor(s): Michael Braunstein, PhD This project focused on the automation of a Hanle effect experimental apparatus and the use of the automation process in taking measurements of the lifetime of the first 𝑆𝑆 1 0 − 𝑃𝑃 1 3 transition of mercury atoms. The Hanle effect causes atoms in an excited state to precess in the presence of a magnetic field, modifying the direction emitted photons travel from the decay of the excited state. Automation was achieved by writing a Python script able to control a NI 9402 digital counter which counts photons incident upon a photomultiplier tube, and a Keithley 2231-A Triple Channel DC Power Supply to vary currents through the coils of the apparatus. This code is able to take measurements over a set range of coil currents for time intervals and iterations set by the user. Measurements are then averaged and placed into a CSV file with their corresponding coil currents, allowing for the necessary analysis to obtain the excited state lifetime in a program such as Microsoft Excel or Origin Lab Pro. This program allows for one full sweep of the current range to take minutes instead of hours, making measurements less susceptible to electronic drift in the instrumentation over time. Presentation Type: Oral Presentation (May 20, 9:30am–5:00pm) Keywords: Hanle effect, Python control of NI counter, Python control of Keithley power supply SOURCE Form ID: 185 Political Science Hard vs. Soft Power in Practice: Explaining How China and Russia Differ in Global Foreign Policy Strategies Sean Williams Project Mentor(s): Shawn Reichert, PhD; Bernadette Jungblut, PhD Since the end of World War II, Russia and China have played major roles in international politics. With both states having autocratic leaders, they pursue different policy strategies in international politics, creating a unique situation in their interactions with various states, whether they are allies or not. With China, its foreign policy is based on soft power, using public diplomacy to influence various states. With Russia, its foreign policy is based on hard power, using its military power to influence the behavior of various states it interacts with. Both foreign policy strategies have created political victories and headaches in their respective states.
Presentation Type: Oral Presentation (May 20, 9:30am–5:00pm) Keywords : War, Strategy, Diplomacy, Policy, International Relations SOURCE Form ID: 249
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