Comparing Absorbed Doses of Properly and Improperly Collimated Abdominal Exposures

The purpose of this study was to calculate and compare the absorbed doses of properly and improperly collimated repeat examination exposures and to measure the anode heel effect to determine the difference in intensity between the cathode and anode ends of the x-ray beam. The investigators wanted to document the amount of additional radiation a patient receives due to improper collimation techniques and determine whether the difference in intensity between the anode and cathode ends of the x-ray beam was large enough to cause concern for increased patient absorbed doses for specific radiography examinations

Acceleration of Coronal Mass Ejection Plasma in the Low Corona as Measured by the Citizen CATE Experiment

The citizen Continental-America Telescopic Eclipse (CATE) Experiment was a new type of citizen science experiment designed to capture a time sequence of white-light coronal observations during totality from 17:16 to 18:48 UT on 2017 August 21. Using identical instruments the CATE group imaged the inner corona from 1 to 2.1 RSun with 1 43 pixels at a cadence of 2.1 s. A slow coronal mass ejection (CME) started on the SW limb of the Sun before the total eclipse began. An analysis of CATE data from 17:22 to 17:39 UT maps the spatial distribution of coronal flow velocities from about 1.2 to 2.1 RSun, and shows the CME material accelerates from about 0 to 200 km s−1 across this part of the corona. This CME is observed by LASCO C2 at 3.1–13 RSun with a constant speed of 254 km s−1. The CATE and LASCO observations are not fit by either constant acceleration nor spatially uniform velocity change, and so the CME acceleration mechanism must produce variable acceleration in this region of the corona

The Physics of Frisbee Golf

https://scholarworks.moreheadstate.edu/student_scholarship_posters/1082/thumbnail.jp

Measuring a Rifle’s Recoil Using Wireless Dynamics Sensor System

https://scholarworks.moreheadstate.edu/student_scholarship_posters/1076/thumbnail.jp

Detection of Radioactivity in Black Organic Shale

https://scholarworks.moreheadstate.edu/student_scholarship_posters/1220/thumbnail.jp

Worldwide variations in artificial skyglow

Despite constituting a widespread and significant environmental change, understanding of artificial nighttime skyglow is extremely limited. Until now, published monitoring studies have been local or regional in scope, and typically of short duration. In this first major international compilation of monitoring data we answer several key questions about skyglow properties. Skyglow is observed to vary over four orders of magnitude, a range hundreds of times larger than was the case before artificial light. Nearly all of the study sites were polluted by artificial light. A non-linear relationship is observed between the sky brightness on clear and overcast nights, with a change in behavior near the rural to urban landuse transition. Overcast skies ranged from a third darker to almost 18 times brighter than clear. Clear sky radiances estimated by the World Atlas of Artificial Night Sky Brightness were found to be overestimated by ~25%; our dataset will play an important role in the calibration and ground truthing of future skyglow models. Most of the brightly lit sites darkened as the night progressed, typically by ~5% per hour. The great variation in skyglow radiance observed from site-to-site and with changing meteorological conditions underlines the need for a long-term international monitoring program

Novel quinoxaline 1,4-di-N-oxide derivatives as new potential antichagasic agents

As a continuation of our research and with the aim of obtaining new agents against Chagas disease, an extremely neglected disease which threatens 100 million people, eighteen new quinoxaline 1,4-di-Noxide derivatives have been synthesized following the Beirut reaction. The synthesis of the new derivatives was optimized through the use of a new and more efficient microwave-assisted organic synthetic method. The new derivatives showed excellent in vitro biological activity against Trypanosoma cruzi. Compound 17, which was substituted with fluoro groups at the 6- and 7-positions of the quinoxaline ring, was the most active and selective in the cytotoxicity assay. The electrochemical study showed that the most active compounds, which were substituted by electron-withdrawing groups,possessed a greater ease of reduction of the N-oxide group

Bubble gum Bernoulli: A classic demo updated

A brief article written by Jennifer and Ignacio Birriel and published in the September 2014 issue of The Physics Teacher

Glow Sticks: Spectra and Color Mixing

Glow sticks are a popular Halloween staple familiar to most of our students. The production of light via a chemical reaction is called “chemiluminescence,” and glow sticks are often used as demonstrations and experiments in the chemistry classroom to study reaction rates as a function of temperature. A black light can be used to illuminate glow sticks that have not been cracked or those that are “dead” in order to demonstrate fluorescence in liquid chemicals. In this article, we present the use of glow sticks as an inexpensive demonstration of spectra and color addition