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The goal of this project is to analyze the fluctuating pressure around an oscillating cylinder in crossflow and relate it to vortex shedding effects. The effects to be analyzed include the changes in unsteady lift and drag. Power spectral analysis of the fluctuating components of lift and drag were used to understand these effects. To analyze the pressure, several hearing-aid microphones were placed on the circumference of the cylinder and a potentiometer was employed to measure the amplitude of oscillation.
The experiment used a 1.5 inch outside diameter aluminum cylinder. In the middle of the cylinder's length is an aluminum insert that contains the microphones. At the ends of the cylinder lies a plate that is used to counteract the boundary layer and end effects. The cylinder is going to move perpendicular to the flow. This motion is produced by using a servo motor linked to the cylinder. The cylinder is supported by two rails that are located outside of the wind tunnel. These two rails permit an almost frictionless motion in the direction perpendicular to the flow.
An important conclusion derived from this project is that there is a correlation between lift and displacement, indicating lock-in. This lock-in condition was present when the cylinder was excited at the vortex shedding frequency.
One of the most common programming techniques is to manipulate a data structure. On most distributed-memory systems the data structure must be partitioned and the parts hidden in a fixed number of processes, creating an artificiality and complexity in parallel programs. The Memo system provides synchronization and communication facilities to parallel processes. Processes communicate through a shared directory of unordered queues. Memo is shown to provide a wide variety of shared data structures -- including arrays, I-structures, barriers, locks, and semaphores-- arid programming techniques -including job jars, dataflow, and reactive objects. Memo has been implemented in C on a multiprocessor SGI computer (Charlie) and on UNIX networks. In comparing Memo to the Linda Programming model, it is shown that almost all Linda Algorithms use tuple space to simulate directories of queues, which is provided directly in Memo.
We have developed a methodology to implement customer satisfaction surveys on the World Wide Web as well as store and retrieve them for analysis. First, we completed a literature review of existing surveys to examine proper format and content for a customer satisfaction survey. We also conducted focus group discussions with potential survey users. During the focus groups, we asked some of the survey questions and recorded responses. We also asked about the types of surveys users prefer to complete and what can induce the users to complete them. Based on the results of the survey responses and the literature review, we were able to design an effective format for asurvey with a customized content. In essence, we customized the survey to obtain more critical feedback on customer satisfaction with the web site. A process to collect and store user responsesfrom the survey was also designed. Unlike many existing surveys that e-mail the responses to a survey administrator, this process stores the responses to a single file, allowing an administrator to quickly download the file for analysis. We used this methodology to develop a pilot survey that will be posted on the Illinois Institute of Technology (IIT) web site. This poster session will discuss the scope of the design and collection processes for the IIT pilot survey.
A hemoglobin plasmid (VtHb) found in the bacteria Vitreoscillaincreases its ability to bind oxygen for aerobic respiration, and also improves it's growth. Certain bacteria, used in bioremediation, have the ability to degrade toxic compounds like Trinitro toluene (explosive), or Dicamba (pesticide). Recombinant forms of these bacteria containing the VtHb plasmid will also show increased growth. The structure of VtHb is unknown. This study attempts to determine the structure of VtHb in order to give more insight on it's ability to act as a oxygen transport.
Escherichia cold pUC8: 15 will be grown in Terrific broth, then extracted with a lysozyme. Purification of VtHb can be done using a DEAR cellulose chromatography, column coupled with a Sephadex column. VtHb can be identified using a spectrophotometer, absorbing at 410 nm and using gel electrophoresis. Once purified, the structure can be determined by X-ray crystallography.
