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Full-Text Articles in Physics
Interdisciplinary Diffusion Lab, Sable Rosana Canales, Chloe Gaban
Interdisciplinary Diffusion Lab, Sable Rosana Canales, Chloe Gaban
Andrews University Teaching and Learning Conference
Diffusion is a principle in Physics, Chemistry, and Biology. Students can model the rate of diffusion based on particle size by contrasting blue and yellow dyes. Two petri dishes containing agar-agar receive a drop of dye at the center. The radius of expansion is recorded over time and variance increases linearly with time. Diffusion constants vary by particle size, allowing for a size ratio comparison between blue and yellow dyes. Relating the data to cells, students predict that smaller molecules diffuse into living cells, whereas larger molecules need some assistance from protein channels as in facilitated diffusion.
P-39 Interdisciplinary Diffusion Lab, Sable Canales, Chloe Gaban, Mickey Kutzner
P-39 Interdisciplinary Diffusion Lab, Sable Canales, Chloe Gaban, Mickey Kutzner
Celebration of Research and Creative Scholarship
Diffusion is a principle in Physics, Chemistry, and Biology. The rate of diffusion is affected by temperature, particle size, concentration, and material type. Students can model the rate of diffusion based on particle size by contrasting blue and yellow dyes. Two petri dishes containing agar-agar receive a drop of dye at the center. The radius of expansion is recorded over time. The variance of the distribution grows as 𝜎2=4𝐷𝑡, where 𝜎2 is the variance, D is the diffusion constant, and t is time. Graphing variance versus time gives a slope of 4D. Diffusion constants vary by particle size, allowing for …
P-13 Astronomy From Ripples In Spacetime, Tiffany Summerscales
P-13 Astronomy From Ripples In Spacetime, Tiffany Summerscales
Celebration of Research and Creative Scholarship
The LIGO and Virgo detectors have made a total of 11 confirmed measurements of gravitational waves, the faint ripples in the fabric of spacetime predicted by Einstein’s theory of general relativity. Ten of these gravitational wave events were caused by the inspiral, collision, and merging of a pair of black holes and the remaining event by a pair of neutron stars. These measurements have helped us learn about the objects that produced the gravitational waves. Regular candidate detections are now shared in real time with both astronomers and the public.
P-43 Doing Astronomy With Gravitational Waves, Tiffany Summerscales
P-43 Doing Astronomy With Gravitational Waves, Tiffany Summerscales
Celebration of Research and Creative Scholarship
With the first detection of gravitational waves on September 14, 2015, the new era of gravitational wave astronomy began. Gravitational wave detections, along with observations made by optical telescopes, have given us new information about the universe. This includes new estimates of the numbers of black holes in the universe and their properties, as well as confirming theories about the sources of some gamma ray bursts and how those sources produce heavy elements.
Searching For The Origins Of Matter, Joshua L. Barrow
Searching For The Origins Of Matter, Joshua L. Barrow
Andrews Research Conference
The big bang and inflation are experimentally confirmed by multitudes of astronomical observations, yet theoretical tension still exists upon a very important question: why is there something rather than nothing? In other words, why are there unequal amounts of matter and antimatter? Why did a supposedly initially symmetric state not annihilate perfectly?
The breaking of this symmetry has allowed for all of material existence--also known as baryogenesis, the prevalence of matter over antimatter--and yields the theoretical possibility of direct detection by observation of baryon number violating mechanisms, which have previously never been observed.
One such plausible mechanism can be found …