The trade-off characteristics of acoustic and pressure sensors for the NASP

Results of a trade study for the development of pressure and acoustic sensors for use on the National Aerospace Plane (NASP) are summarized. Pressure sensors are needed to operate to 100 psia; acoustic sensors are needed that can give meaningful information about a 200 dB sound pressure level (SPL) environment. Both sensors will have to operate from a high temperature of 2000 F down to absolute zero. The main conclusions of the study are the following: (1) Diaphragm materials limit minimum size and maximum frequency response attainable. (2) No transduction is available to meet all the NASP requirements with existing technology. (3) Capacitive sensors are large relative to the requirement, have limited resolution and frequency response due to noise, and cable length is limited to approximately 20 feet. (4) Eddy current sensors are large relative to the requirement and have limited cable lengths. (5) Fiber optic sensors provide the possibility for a small sensor, even though present developments do not exhibit that characteristic. The need to use sapphire at high temperature complicates the design. Present high temperature research sensors suffer from poor resolution. A significant development effort will be required to realize the potential of fiber optics. (6) Short-term development seems to favor eddy current techniques with the penalty of larger size and reduced dynamic range for acoustic sensors. (7) Long-term development may favor fiber optics with the penalties of cost, schedule, and uncertainty

Pumping Plant Performance

Irrigation accounts for a large portion of the energy used in Nebraska agriculture. This paper describes a method to estimate the cost of pumping water and compares the amount of energy used by a properly designed and well-maintained pumping plant, represented by the Nebraska Pumping Plant Performance Criteria (NPPPC). The results can help determine the feasibility of repairing the pumping plant. Methods to compare energy sources are also presented. We recommend that you periodically arrange with a well drilling company to test the efficiency of your pump. Worksheets for pumping plant performance are included in the appendix

The Grizzly, October 6, 1978

News briefs: SAC debates funding; Bloodmobile at Ursinus • Hobson attracts more than partiers • ProTheatre to open: Curtains to rise • What\u27s happening at the Union? • Rolling stone • Freedom, responsibility and the campus media • World record coming again! • Guido\u27s Foot: In your ear • History-making event tonight • Keith Jarrett: My song • Phillies in five • Cross country rips opposition • Volleyball gets spiked • Varsity hockey in slump • LAX noteshttps://digitalcommons.ursinus.edu/grizzlynews/1001/thumbnail.jp

Campus Vol IX N 2

Tuttle, C. Cover. Picture. 1. Howard Studio. Miss Betsy Phelps . Picture. 2. Troelstrud. Untitled. Cartoon. 4. Anonymous. Campus Calender . Picture. 5. Aaybe, Nancy. By Any Other Name . Prose. 8. Sherman, Marj. Gone Today and Gone Tomorrow . Prose. 10. Martin, Lyn. Six Weeks Old . Prose. 11. Shaw, Ted. \u27Twas The Night Before Christmas . Cartoon. 12. Bogardus, Edna. On Human Pageants . Prose. 14. Swanson, Dru. Nineveh Disclaimed . Prose. 15. Dock. Untitled. Cartoon. 15.; Curry, Chuck. Varsity Basketball . Prose. 16. Shackelford, Duck. The Freshman Rushing Primer . Prose. 18. Anonymous. Untitled. Prose. 19. Hodge, Beth. Denison\u27s Menaces . Cartoon. 20. Kull, Shaw. Untitled. Cartoon. 10. Kull, Shaw. Untitled. Cartoon. 21. Clifford, Bob. Christmas is For Everyone . Prose.23. Anonymous. Untitled. Cartoon. 23. Kull, Shaw. Untitled . Cartoon. 23

Reaney Feasibility Study.

Conducted on behalf of Planning Capstone 2002. Supported by the Neighborhood Planning for Community Revitalization (NPCR) program at the Center for Urban and Regional Affairs, University of Minnesota

Optical systems integrated modeling

An integrated modeling capability that provides the tools by which entire optical systems and instruments can be simulated and optimized is a key technology development, applicable to all mission classes, especially astrophysics. Many of the future missions require optical systems that are physically much larger than anything flown before and yet must retain the characteristic sub-micron diffraction limited wavefront accuracy of their smaller precursors. It is no longer feasible to follow the path of 'cut and test' development; the sheer scale of these systems precludes many of the older techniques that rely upon ground evaluation of full size engineering units. The ability to accurately model (by computer) and optimize the entire flight system's integrated structural, thermal, and dynamic characteristics is essential. Two distinct integrated modeling capabilities are required. These are an initial design capability and a detailed design and optimization system. The content of an initial design package is shown. It would be a modular, workstation based code which allows preliminary integrated system analysis and trade studies to be carried out quickly by a single engineer or a small design team. A simple concept for a detailed design and optimization system is shown. This is a linkage of interface architecture that allows efficient interchange of information between existing large specialized optical, control, thermal, and structural design codes. The computing environment would be a network of large mainframe machines and its users would be project level design teams. More advanced concepts for detailed design systems would support interaction between modules and automated optimization of the entire system. Technology assessment and development plans for integrated package for initial design, interface development for detailed optimization, validation, and modeling research are presented

Eccentric lamellar keratolimbal grafts harvested with a manually guided microkeratome

Background: To perform lamellar keratolimbal allograft transplantation in a one- step procedure with a single graft, we investigated the feasibility of harvesting eccentric lamellar keratolimbal grafts from conventionally processed corneoscleral buttons using a manually guided microkeratome in conjunction with an artificial anterior chamber system. Methods: We used the Moria LSK- One microkeratome and the automated lamellar therapeutic keratoplasty ( ALTK) system ( Antony, France). Ten human donor eyes were used to obtain single- piece lamellar keratolimbal grafts. Specimens were processed for light and electron microscopy. Results: Eccentric keratolimbal grafts could be obtained from all human donor buttons. Grafts include a crescent- shaped limbal and a large corneal portion. No visible damage to the limbal region was discernible. Conclusion: Our data show that the LSK- One microkeratome in conjunction with the ALTK system allows harvesting eccentric keratolimbal grafts from donor corneoscleral buttons. Copyright (c) 2007 S. Karger AG, Basel