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Full-Text Articles in Physics
Periodic Nonlinear Refractive Index Of Carbon Disulfide Vapors, Evelyn Strunk
Periodic Nonlinear Refractive Index Of Carbon Disulfide Vapors, Evelyn Strunk
HIM 1990-2015
The purpose of this thesis is to explore the nonlinear refractive index of carbon disulfide vapors as opposed to its liquid form. With CS[sub2] vapors, the vapors are less dense so they will rotate longer than liquid CS[sub2] because there are less intermolecular interactions. The electric field of the beam causes the molecules to align with the electric field and applies a torque to the molecules. After this excitation, the molecules continue rotating. The rotations change the index of refraction of the material. Continuous rotation of the molecules causes the index of refraction to be periodic which means the molecules …
Coarse Grained Monte Carlo Simulation Of The Self-Assembly Of The Hiv-1 Capsid Protein, Jeffrey Weber
Coarse Grained Monte Carlo Simulation Of The Self-Assembly Of The Hiv-1 Capsid Protein, Jeffrey Weber
HIM 1990-2015
In this study, a Monte Carlo simulation was designed to observe the self-assembly of the HIV-1 capsid protein. The simulation allowed a coarse grained model of the capsid protein with defined interaction sites to move freely in three dimensions using the Metropolis criterion. Observations were made as to which parameters affected the assembly the process. The ways in which the assembly were affected were also noted. It was found that proper dimerization of the capsid protein was necessary in order for the lattice to form properly. It was also found that a strong trimeric interface could be responsible for double-layered …
Micro-Raman Spectroscopy Of Carbonaceous Chondrite Meteorites, Asmail Habach
Micro-Raman Spectroscopy Of Carbonaceous Chondrite Meteorites, Asmail Habach
HIM 1990-2015
Analyzing the constituents of meteorites has played an important role in forming the contemporary theories of solar system evolution, planets formation, and stellar evolution. Meteorites are often a complex mixture of common rock forming silicates, such as olivines and pyroxenes, with a range of exotic species including hydrated silicates, and in some cases organic compounds. We used Micro-Raman spectroscopy to analyze the compositions of three carbonaceous chondrites: NWA852, Murchison and Allende. Raman spectra were measured using laser sources with different excitation wavelengths: HeNe 633 nm and Nd:YAG 532 nm. We were able to detect 9 minerals in NWA852, 3 minerals …
Pressure And Temperature Response Of A Stimuli-Responsive Polymer Probed With Raman Microscopy, Coleman Cariker
Pressure And Temperature Response Of A Stimuli-Responsive Polymer Probed With Raman Microscopy, Coleman Cariker
HIM 1990-2015
Poly(N-isopropylacrylamide) (PNIPAM) is a thermo-responsive hydrogel; that is, it is a macromolecule which exists in a hydrated state beneath its lower critical solution temperature (LCST). Polymers such as PNIPAM undergo a phase transition in response to changes in temperature, pressure, pH, salt concentration, and the addition of co-solvents. Previously, visible-light microscopic measurements of the pressure-induced phase transition have been hindered by the lack of a pressurization apparatus with the short working distance and optical transmission properties necessary for high resolution microscopy. We employ a high pressure setup which uses a fused silica micro-capillary to contain the sample. Our experiment reveals …