PACOSS program overview and status

Many future civilian and military large space structures (LSS) will have as performance objectives stringent pointing accuracies, short settling times, relatively fast response requirements, or combinations thereof. Many of these structures will be large, light weight, and will exhibit high structural modal density at low frequency and within the control bandwidth. Although it is possible in principle to achieve structural vibration control through purely active means, experience with complex structures has shown that the realities of plant model inaccuracies and sensor/actuator dynamics frequently combine to produce substandard performance. A more desirable approach is to apply passive damping technology to reduce the active control burden. Development of the technology to apply this strategy is the objective of the PACOSS (Passive and Active Control OF Space Structures) program. A key element in the PACOSS program is the Representative System Article (RSA). The RSA is a generic paper system that serves as a testbed for damping and controls studies. It also serves as a basis for design of the smaller Dynamic Test Article (DTA), a hardware testbed for the laboratory validation of analysis and design practices developed under PACOSS

Teacher Training for Medical Students and Residents

The directors of many medical education accreditation bodies have called for an increased focus on teacher training for physicians and other medical professionals. As the role of specialist physicians becomes busier, many of their traditional teaching expectations have been transferred to residents and medical students. Many medical school directors have created Resident as Teacher (RAT) curricula to better prepare their students as educators. In this project, the author reviewed the literature relating to existing RAT programs. After reviewing the literature, the author created a RAT curriculum to be utilized on Medicine in the Wild, a month long, expeditionary medical school elective offered by the Wilderness Medicine Institute of NOLS and the Harvard Associated Emergency Medicine Residency

General Report Session 4: Dynamic Earth Pressures and Seismic Design of Earth Retaining Structures

The great number of significant variables which effect the seismic behavior of retaining structures make this both a fascinating subject and a difficult one. The ten papers in this session cover both elastic and plastic aspects of analysis and design for a wide variety of wall types. To help put them in perspective, a new, fundamental seismic free-field solution will be reviewed briefly. This will serve as a benchmark from which the effects of changing the lateral boundary condition by introducing various types of walls can then be evaluated

A Comparison of staggered position one angle process color printing with four angle and one angle process color printing

The Staggered Position One Angle method of preparing color separations does not adjust the dot angle for each color. The dot pattern is staggered horizontally or vertically by half a row of dots for each separation maintaining the same angle. The investigation compared the Staggered Position method to the four angle method and to the dot-on-dot method. Newsprint was the substrate, and 65, 85, and 100 lines per inch were the rulings. Experienced judges viewed the representative prints and scored each for sharpness, color variability, and overall acceptance. They were also asked to indicate the evidence of rosette and moire patterns. Densitometric and spectrophotometer readings were used for objective analysis. The judges found the Staggered Position to be equal or better than both four angle and dot-on-dot printing in most instances. A non existant rosette pattern and a minimal risk of moire\u27 patterns also resulted. The Staggered Position printing excelled in the ability to produce a sharp reproduction, and its tone reproduction was found to be equivalent to the four angle and dot-on-dot printing. The use of Delta E for the visual rejection or acceptance of an image was found not to be a good indicator in this particular study. The study opens up a number of areas for further research into this new separation method, but because of its good performance on newsprint, it should be considered as an alternative to the four angle method for newspapers

Unpopular Sovereignty: Mormons And The Federal Management Of Early Utah Territory

Bleeding Utah?: The Importance of Mormon Utah in Antebellum U.S. Politics Mormon history is firmly rooted in, and a distinct product of, U.S. history. Yet, for much of the twentieth century, nineteenth-century United States historiography and nineteenth-century Mormon historiography have remained...

Is the Whole Greater than the Sum of Its Parts? The Applicability of the Fair Use Doctrine to the New Breed of Instant Messaging Software

Imagine: you are preparing your fifteen-year high school reunion. When you were in high school, two rival bands played at dances. Everyone at school knew the bands and most students enjoyed the music. Like most music groups, neither band obtained a recording contract with a record label. You are not aware that during a garage practice session, the bands\u27 members recorded some of their songs. Of these songs, only a few scratchy recordings remain. You decide that you are going to search the Internet to see whether you can find any copies of the songs that would enthuse and delight the audience at your fifteen-year high school reunion