The three-dimensional Event-Driven Graphics Environment (3D-EDGE)

Stanford Telecom developed the Three-Dimensional Event-Driven Graphics Environment (3D-EDGE) for NASA GSFC's (GSFC) Communications Link Analysis and Simulation System (CLASS). 3D-EDGE consists of a library of object-oriented subroutines which allow engineers with little or no computer graphics experience to programmatically manipulate, render, animate, and access complex three-dimensional objects

Aspirated compressor

Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2000.Also available online at the MIT Theses Online homepage .Includes bibliographical references (p. 53).The current motivators in gas turbine aircraft engine design are improved efficiency and reduced engine weight. The drive for improved efficiency leads to high pressure ratio compressors with multiple stages, as thermodynamic efficiency increases with pressure ratio. These compressors are both heavy and expensive. Recent work by Kerrebrock, Merchant, and Schuler, has led to the possibility of achieving high pressure ratios with a reduction in the number of stages. These compressors use aspiration, or suction on the surface of the blades and end-walls, to keep the boundary layer attached under higher loading conditions, reducing losses. The work done by a rotor is related to the change in swirl across the blade and the rotational velocity of the blades. Counter-rotation provides for the largest change in swirl across a series of rotors, facilitating the largest pressure ratio. A three-stage, counter-rotating, compressor was designed to take advantage of these benefits. The tip speeds were kept as high as possible to increase the work done on the flow. The final design has a three-stage pressure ratio of 27, much higher than is currently available in three stages. The blade aspect ratios are smaller than on current compressors because of the large swirl change across each blade row. The flow passage has large contractions across each blade row, causing sharper turns in the flow path than is currently observed. The design consists of the flow passage, blade numbers and locations, rotor speeds, and desired swirl changes through each blade row. These data will allow later efforts to design the blade shapes. A mean line analysis was conducted to design a three stage turbine to drive the compressor. The benefits of counter-rotation are apparent in the turbine, as the turbine is designed without inter-rotor nozzles. Reduced engine weight and improved efficiency are available through the turbine section with the elimination of these nozzles.by Jeffrey H. Freedman.S.M

Establishing a Low-Cost Telecommunications Method to Provide Tele ENT Consultations From a Military Medical Center to Deployed Locations

In many deployed locations, access to expert medical advice can be limited. The expansion of telemedicine has bridged this gap; however, the large and costly technology required to perform telemedical activities hinders its accessibility. This study aimed to develop a low-cost telemedicine method in order to perform tele ENT consultations for deployed military personnel. The results indicated an ability to transmit clear endoscopic images between deployed and garrison locations using low weight/volume/cost laptop based telemedicine technology