Physics Commons^™

Extrapolation Of The Experimental Data Of Electron Scattering, Hansen Chen

Opportunities for Undergraduate Research Experience Program (OURE)

Our problem of interest is electron-atom scattering. One type of experiment is to measure the number of electrons exciting an atom from a initial s-state to a final p-state. These measurements are proportional to the differential cross section (DCS)….

The plane wave Bom approximation is known not to be accurate enough. However Lassetre claims that even if PWBA (plane wave Bom approximation) is not reliable, a more accurate theory should still extrapolate to the optical oscillator strength.

The theory we are using is significantly better than the PWBA. According to Lassetre’s theorem, our theory should extrapolate to the optical oscillator …

Nonlinear Dynamics And The Lorenz Water Wheel, Richard Margis

Opportunities for Undergraduate Research Experience Program (OURE)

Undoubtedly one of the most exciting frontiers in physics today is the study of nonlinear systems, more popularly called chaos. Chaos is the key to many time-dependent processes in as varied fields as meteorology (such as weather modeling), mechanics (the three-body problem in gravitational fields), and economics (prediction of trends in the stock market).

Combustion Aerosol Morphology, Ronald P. Holland

Opportunities for Undergraduate Research Experience Program (OURE)

The following report entitled Carbon Aerosol Morphology is the result of research done through the University of Missouri--Rolla Graduate School program entitled Opportunities for Undergraduate Research Experience (OURE). My appointment was for the Summer - 1990 with the Cloud and Aerosol Sciences Laboratory, Department of Physics, located in Norwood Hall. The goal of this appointment was to study the size and morphology of combustion aerosols whose characteristics are dependent on the history of the particle, e.g. exposure to chemicals, scavenging effects, and other time dependent factors. Computer image processing software is available in the department for this purpose.

Aerosol Particle Bounding In Cascade Impactors, Bisma Husen

Opportunities for Undergraduate Research Experience Program (OURE)

Particle deposition characteristics were observed from the aerosol sampling results of a UNICO cascade impactor. A simple model of particle motion combined with Hiemenz flow of stagnation flow on a flat plate were developed and discussed.

Both results and analysis were compared to recent models on particle bouncing errors or secondary deposition which included vortices formation around the edge of the slot, back spin (Magnus effect), and hydrodynamic conditions of the particles. The analysis was limited to a laminar inviscid and incompressible case. The main obstacle in the observation was the fact that impactor nozzles were unsymmetrical to a considerable …

Fourier Transform Infrared (Ftir) Spectroscopy Analysis Of Combustion Aerosol, Gary Jacquin

Opportunities for Undergraduate Research Experience Program (OURE)

In conjunction with my co-op program at McDonnell-Douglas, my current OURE project is the analysis of combustion aerosols using Fourier Transform Infrared (FTIR) Spectroscopy. Aerosol science is a very important field as it is concerned with atmospheric chemistry, atmospheric physics, climate, public health, and environmental issues.

In the Cloud and Aerosol Sciences Laboratory (CASL) at UMR, combustion aerosols are generated by an in-house designed torch or burner. The fuels, JP4 and JP5, are provided by McDonnell-Douglas. Some other commercial fuels are also used. The primary objective of my OURE project was to generate and collect combustion aerosols for chemical analysis. …

Process For Scanning Photographic Slides Of Laser Light Scattering With A Transmission Densitometer, Don Newburry

Opportunities for Undergraduate Research Experience Program (OURE)

Non-symmetric variations in photographic slides of polarized laser light scattering experimental results are difficult to see. This paper explains a process developed for measuring the light density at points throughout the slide area using a transmission densitometer, so an accurate description of the laser light scattering may be obtained. A slide was tested using the described process and the results are presented. The results turned out well, but there were some errors introduced by the instability of the densitometer and by human error in reading the chart recorder output.

A Measurement Of The Relative Efficiency Of A Channeltron, Steve Scott

Opportunities for Undergraduate Research Experience Program (OURE)

The original goal of this project was to determine the characteristics of a channeltron, a device used to detect electrons. While most channeltrons have entrance cones which are quite small, the channeltron we were to study had a significantly larger one. Due to its large size, the possibility existed that the channeltron would be more efficient at detecting electrons which hit near the center of the channeltron entrance than at detecting the electrons which hit near the edge. The main purpose of the experiment was to determine the relative detection efficiency of the channeltron as a function of the position …