The generation of a Gaussian random process in a position parameter

Analog computer method for approximating stationary Gaussian random process depending only on position paramete

Three-Bladed Propeller Design for the Reduction of General Aviation Radiated Noise Characteristics

The purpose of this study was to design a quiet 3-Bladed propeller for general aviation aircraft. A combination of design technique and analytical predictions using the NASA Aircraft Noise Prediction Program - Propeller Analysis System (ANOPP-PAS) was used to achieve this goal. The propellers were designed for an engine power of 200 hp, a rotational speed of 2,400 RPM and a free-stream speed of 160 kts. A straight 76 in. diameter 2-bladed propeller was designed as a reference for the 64 in. diameter 3-bladed propeller. The ANOPP-PAS computer code was used for predicting the aerodynamic performance and radiated noise characteristics for both the 2-bladed and 3-bladed propeller designs. Through blade design modifications and the use of conventional, as well as specifically designed natural-laminar-flow (NLF) airfoils, 3-bladed propeller designs resulted in predicted noise reductions of 3.4 dB in the near-field which corresponds to 5.1 dBA; and a 3.4 dB (7.0 dBA) in the far-field when compared to the 2-bladed propeller. These 3-bladed designs resulted in no appreciable change in aerodynamic performance but an estimated 43% weight increase

Armor

I never played sports. It never felt right or good. Sports created a space in which my body would be on display. A display which invited attention to a performance of masculinity. And under that scrutiny, I would fail. Fail to perform with the strength I was expected to exhibit. Removed from the pressure of performance, I can consider the equipment, the gear, the spaces and re-materialize them. I shift what is on display. Displaying the altered objects rather than the body and its performance. Looking at the objects not as tools for the body to interact with but as pieces that perform on their own. Game and combat. Play and fight. In my own private game I wrestle with myself. Playing internal defense and offense, back and forth of doubt. The mind plays tricks, the tricks play me

Estimating Post-Liquefaction Displacements in Embankment Dams and Priorities Remediation Measures

Large displacement analysis is used to simulate the failures of flood protection dikes in Hokkaido, Japan, which occurred during the 1993 Kushiro-oki earthquake. These studies served to validate the method of analysis. The analysis was then used to predict displacements in dikes with potential for liquefaction by relating displacements to geometric characteristics of the dikes: height, slopes, and thickness of potentially liquefiable layer. The predictions were verified using dike displacement data from the Nansei-oki earthquake of 1994. The basis for reliable post-liquefaction analysis is a good estimate of the residual strength of the liquefied soils. For this reason, recent developments in evaluating residual strength are reviewed

Leading Educational Technology Change Through Faculty Development: Creating Lasting Relationships

Learning environments in are changing rapidly, with increased attention surrounding active learning, educational technologies, and their impact on teaching and learning. Companies are introducing innovative technologies at breakneck speeds, often overwhelming academic leaders needing to meet the needs of the institution, faculty, students, and community. This whirlwind of change creates new challenges and opportunities to address as leaders guide their institutions toward adopting new educational technologies. Faculty are increasingly bombarded by innovative technology, while remaining pedagogically grounded. This presentation draws on research in this area and experience working with faculty and staff from 14 residential liberal arts colleges

The Impact of Low Probability Ground Motions on Canadian Geotechnical Engineering Practice

The adoption of design motions with a 2% rate of exceedance in 50 years in the National Building Code of Canada (NBCC 2005) has had a major impact on geotechnical engineering practice in Canada. The peak ground accelerations were doubled compared with the previous motions which had an exceedance rate of 10% in 50 years. The increase in accelerations has had a huge effect on assessments of liquefaction potential and slope stability, because the methods of assessment in common use depend on peak ground acceleration. This paper describes typical problems encountered in Canadian practice with use of the low probability motions and describes some measures for alleviating the impact on design, while maintaining the code objective of life safety