Lower Stratospheric Measurement Issues Workshop Report

The Lower Stratospheric Measurement Issues workshop was held on 17-19 Oct. 1990. The 3-day workshop was sponsored by the Atmospheric Effects of Stratospheric Aircraft (AESA) component of the High Speed Research Program (HSRP). Its purpose was to provide a scientific forum for addressing specific issues regarding chemistry and transport in the lower stratosphere, for which measurements are essential to an assessment of the environmental impact of a projected fleet of high speed civil transports (HSCTs). The objective of the workshop was to obtain vigorous and critical review of the following topics: (1) atmospheric measurements needed for the assessment; (2) present capability for making those measurements; and (3) areas in instrumentation or platform development essential to making the measurements

Disruptive design innovation: reflections on the relationship of design, science and art

The title of designer conveys a large number of historical, cultural, philosophical drivers and working practises that effectively range from the traditional engineer through to the individual interested in personal expression. The considerable differences originate and have evolved for a variety of reasons. The range is from capitalist necessity through to social inclusion. Today, the designer needs to have the ability to understand significant changes in technology, art and science as well as being an astute observer of human behaviour. Ultimately, the designer will need to convert ideas into objects and systems that people can understand and use. It is important to consider serendipitous design and disruptive design as it often involves risk taking and may be unpredictable in character. Disruptive design innovation can improve a design in ways that the customer or a market does not expect. The authors suggest a refreshing approach to design that is inclusive in purpose to enrich the act of designing and advocate a greater correlation between the art, sciences and design in reflecting the values, virtues and methods of working and the principles that guide the methodologies and processes which can be correlated into a coherent whole and with a clearer focus

Large spacecraft pointing and shape control

The overall objective of this program was the development of control algorithms that allow the concurrent operation of slewing, pointing, vibration, and shape control subsystems. This objective is important for near-term space surveillance missions that require the rapid retargeting and precise pointing of large flexible satellites. The success of these missions requires the design and concurrent operation of the various interacting control subsystems. There were two phases conducted: phase 1 was mathematical model development, and phase 2 was control development. The program is detailed and major conclusions given

Lysmata Rafa, a New Species of Peppermint Shrimp (Crustacea, Caridea, Hippolytidae) from the Subtropical Western Atlantic

Lysmata rafa n. sp. is described from freshly collected specimens from the Keys West Lakes, Florida Keys, and from a museum specimen collected at Bear Cut, Biscayne Bay, Florida. The new species is morphologically most similar to the western Atlantic Lysmata rathbunae Chace, 1970 and the eastern PaciWc Lysmata gracilirostris Wicksten, 2000, but can be distinguished from them by the number of carpal segments in the second pereiopod; the length and dentition of the rostrum; the shape and number of spines on the dactylus of the third to Wfth pereiopods; and the absence of a tooth on the pterygostomial margin of the carapace. Despite being a shallow-water species, L. rafa n. sp. has extremely elongate walking legs and third maxilliped that are more typical to deep-water or cave dwelling carideans

Topological Order and Reflection Positivity

The interplay between the two fundamental concepts of topological order and reflection positivity allows one to characterize the ground states of certain many-body Hamiltonians. We define topological order in an appropriate fashion and show that certain operators have positive expectation value in all ground states. We apply our method to vortex loops in a model relevant to topological quantum memories.Comment: 3 pages, 1 figur

The Public Health Impact of Needle Exchange Programs in the United States and Abroad: Summary, Conclusions, and Recommendations

The goal of the project was: "To assess the public health impact of needle exchange programs." Fourteen research questions were identified; Chapters 5 through 18 of Volume I of the report each address one of these research questions. The study consisted of four components: 1) formal review of existing research, 2) NEP site visits; 3) mail surveys of NEPs not visited; and 4) cost-effectiveness modeling

Argon resonance line lamp for vacuum ultraviolet photochemistry

The use of rare gas resonance line lamps as sources of monochromatic radiation for photochemical studies is well known.(1-5) Argon is ideally suited for photoionization studies of the simpler hydrocarbons which have ionization potentials below 11.6 eV. It has resonance lines at 1048 Å (11.83 eV) and 1067 Å (11.62 eV), with no other emission lines between 1050 and 2000 Å when pressures less than 1 Torr are used

The effect of growth hormone on the growth of the tibia/fibula complex and femurs of hypophysectomized rats after unilateral limb denervation

Thesis (M.Sc.D.)--Boston University School of Graduate Dentistry, 1972 (Orthodontics)Bibliography included