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Custom Author Archive Page Thesis
The inability to resolve close stars due to the Rayleigh criterion complicates the search for closely orbiting binary brown dwarf systems. We have developed a Fortran computer program that uses point spread function fitting on Hubble archive data to find binary systems at separations that are visually unresolvable. To test the performance of this program under the full range of param- eters (brightness, separation, position angle, background noise), we have created and analyzed six hundred thousand simulated binary data sets. The results from this test suggest that our program should be able to successfully identify binary systems at separations of less than a pixel. In par- ticular, we can place limits of around 90 percent certainty that the brown dwarf star BD0559 is actually a binary system with a separation of 0.035 arcsec.
In the past two decades, the search for the answers to these questions have spurred a number of important contributions to the game theoretical literature on political parties that examined party politics either at the level of individual politicians and voters, or as a process involving factions the intraparty groups of likeminded party members.
An electronic archive for preprints in the philosophy of science.
An investigation into possible effects from the radial relative velocity of observed objects. RR Lyrae type variable stars are chosen as the subjects of the research. Light curves from three stars, taken from Kepler observations, are examined. Data reveals that there is a measurable effect: a shift of 0.01% per 33 km/s velocity. The relevance of this, as well as an anomalous measurement, are discussed.
30. The most obvious suggestion is the one seldom followed. Try to attendone or more defenses prior to yours. Find out which other studentsare defending their research and sit in on their defense. In many departmentsthis is expected of all graduate students. If this is not the case foryou, check with your adviser to see that you can get an invitationto attend some defenses.
Graduate Thesis Archive | Swenson College of Science …
Simulations and other virtual teaching aids are relatively new to the classroom, and have had limited research on their effectiveness. This study was conducted as part of my student teaching experience and compared the educational effects of a class period using computer simulations compared to a one using traditional lab experiments. The students were given four multiple-choice questions before doing the lab, after the class period, and at the end of the unit. The data collected from student scores shows that while the students did learn from the lab, there was not a significant difference between the lab styles. However, the data comparing the two lab styles over time was barely below being significant. Further research could involve more periodic tests and tests some time after the unit was over to better measure the long-term retention rate between the lab styles.
Silicon dioxide (SiO2) is useful in microelectronics, micro-fabrication and optics. It has traditionally been deposited through low-pressure chemical vapor deposition (LPCVD) at high temperatures (about 900 to 1000 C). Various reactants have been used in this process, such as dichlorosilane and oxygen, or silane and nitrous oxide in different combinations. We explore the reaction of dichlorosilane and nitrous oxide in SiO2 LPCVD by varying the temperature from 850 to 950 C and the pressure from 0.30 to 1.05 Torr. Films with mirror-like surfaces are deposited in an ambient temperature of 900 C, with a gas ratio of 3.33 parts nitrous oxide for every one part dichlorosilane, and at a pressure between 0.35 and 0.69 Torr, while pressures outside of this range result in foggy surfaces or no deposition. These results are in good agreement with previous work and indicate that careful control of pressure is necessary for depositing uniform films for use in optical applications.
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University Of London Phd Thesis Archive
Magnetic domain memory (MDM) is the tendency of a magnetic material to recall its domain pattern after a disturbance resulting from an application of an external magnetic field. In general, magnetic materials do not exhibit this property, but some specialized thin films composed of layered ferromagnetic and antiferromagnetic materials do display magnetic memory. We measure the amount of memory of such films using the x-ray resonant magnetic scattering (XRMS) technique, and use a speckle-correlation technique to quantify the degree of magnetic memory in the sample. In particular, we examine how the magnetic memory in these films persists when we introduce an exchange bias between the ferromagnetic and the antiferromagnetic layers. We find that when bias is applied to the sample, the magnetic memory persists. However, the amount of memory and its behavior throughout the magnetization loop varies with the magnitude of the bias applied. We further find that the amount of memory and its behavior throughout the magnetization loop does not, however, vary much with multiple magnetization loop passes.
Mahatma Gandhi University - Online THESIS Search
Lanthanide series elements are used in many different materials at small concentrations. One application is as the scintillating component of detector materials. X-Ray florescence (XRF) spectroscopy can be used to identify trace elements within materials. The goal of this research is to be able to build an XRF library of lanthanide series elements that can be used as a basis for other measurements. Also, I was able to make an estimate for the limits of detection in our XRF system. I found that K peaks are visible up to 0.1% concentrations by weight; and L series lines are visible up to 1% concentrations by weights. At smaller ratios than these benchmarks the spectrum become too uncertain to make valid measurements.
Thesis Invited for Publication in IJAR - Open access …
Nonlinear propagation effects in rocket noise have been previously shown to be significant [M. B. Muhlestein et al. Proc. Mtgs. Acoust, (2013)]. This paper explores the influence of source level, peak frequency, and ambient atmospheric conditions on predictions of nonlinear propagation. An acoustic pressure waveform measured during a full-scale solid rocket motor firing is numerically propagated via generalized Burgers equation model for atmospheric conditions representative of plausible spaceport locations. Cases are explored where the overall sound pressure level and peak frequency has been scaled to model engines of different scale or thrust. The predicted power spectral densities and overall sound pressure levels, both flat and A-weighted, are compared for nonlinear and linear propagation for distances up to 30 km. Differences in A-weighted overall sound pressure levels of up to 8 dBA are found for one of the cases explored. The differences in overall level suggest that further research to appropriately include nonlinear effects in launch vehicle noise models is worthwhile.
Thesis Invited For Publication in IJAR!!
We numerically study the time-dependent Ginzburg-Landau equations of superconductivity using a Galerkin method implemented in FEniCS, an automated differential equation solver. We consider geometries for both a bulk material (line from zero to infinity) and a film (half-line), corresponding to mixed and Neumann boundary conditions respectively. We simulate quenching by switching on an external magnetic field, allowing the material to approach a steady state, and then switching on a greater field. Our solutions exhibit the Meissner effect, convergence to the steady state solution, and quenching of superconductors.
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