110,219 research outputs found

    An 80 pc Long Massive Molecular Filament in the Galactic Mid-Plane

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    The ubiquity of filaments in star forming regions on a range of scales is clear, yet their role in the star formation process remains in question. We suggest that there are distinct classes of filaments which are responsible for their observed diversity in star-forming regions. An example of a massive molecular filament in the Galactic mid-plane formed at the intersection of UV-driven bubbles which displays a coherent velocity structure (< 4 km/s) over 80 pc is presented. We classify such sources as Massive Molecular Filaments (MMFs; M > 10^4 Msun, length > 10 pc, velocity gradient < 5 km/s) and suggest that MMFs are just one of the many different classes of filaments discussed in the literature today. Many MMFs are aligned with the Galactic Plane and may be akin to the dark dust lanes seen in Grand Design Spirals.Comment: To appear in proceedings of the 'Labyrinth of Star Formation' meeting (18-22 June 2012, Chania, Greece), published by Springe

    Following nature's design principles & solutions

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    This project utilizes the naturally occurring phenomenon of plants and microbial bacteria to communicate, called "cross-talk", as a central approach in addressing humandominated landscape simplification. Through emitting Volatile Organic Compounds (VOCs) these organisms can provide one another with valuable information regarding nutrient and depredation sources and allow organisms to allocate their resources in a proactive and beneficial way. The purpose of this project is to demonstrate the design of an educational research center that can advance the knowledge of how to use natural design strategies based on biotic and abiotic processes, to advance our knowledge and efficiency of yield-producing constructed landscapes, and to explore design in relationship to natural processes. This project includes a proposal for the design of the Cooper/Skinner Sustainable Educational Center on the Cooper-Skinner site, Muncie, Indiana. Which has been designed to contribute to the understanding of the relationship of 1) human-dominated, landscape simplification, 2) cross-talk among organisms, and 3) the role of cross-talk in the management of the health and productivity of landscapes created via site-based processes of built landscape design. The Cooper/Skinner Sustainable Education Center is designed through the homogenization of constructed landscape grid and natural systems patterns to demonstrate the feasibility of human-dominated and natural systems integration. Furthermore, the Center educates individuals on landscape diversity, ecosystem services, and non-renewable inputs in relationship to constructed and industrialized landscapes. The site is designed through a series of diversifying and simplifying species gradients with VOC sampling transects running contiguous along these gradients. The sampling gradients, resembling top-down and bottom-up research methodologies, are then analyzed, comparing them to control samplings taken on-site. This project seeks to identify the threshold of plant and microbial bacteria species diversity required to provide natural systems with adequate complexity to be self-sustaining and capable of complexifying over time. Additionally, a series of introduced, ecologically diverse patches are proposed as an opportunity to learn about how components of living systems can provide valuable information useful for their fertilization, pollination, and protection of neighboring humansimplified landscapes. The hypothesis is that these introduced patches will extend the ecology found within the surrounding vegetative environments into the monocultural zone that is far less alive in terms of beneficial information exchange within the living system.Department of Landscape ArchitectureThesis (M.L.A.

    Directionally solidified eutectic gamma plus beta nickel-base superalloys

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    A directionally solidified multivariant eutectic gamma + beta nickel-base superalloy casting having improved high temperature strength and oxidation resistance properties is provided. This comprises a two phase eutectic structure containing, on a weight percent basis, 5.0-15.0 tungsten, 8.5-14.5 aluminum, 0.0-35.0 cobalt and the balance being nickel. Embedded within the gamma phase nickel-base matrix are aligned eutectic beta phase (primarily (NiCo)Al reinforcing lamellae

    Directionally solidified eutectic gamma-gamma nickel-base superalloys

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    A directionally solidified multivariant eutectic gamma-gamma prime nickel-base superalloy casting having improved high temperature properties was developed. The alloy is comprised of a two phase eutectic structure consisting essentially of on a weight percent base, 6.0 to 9.0 aluminum, 5.0 to 17.0 tantalum, 0-10 cobalt, 0-6 vanadium, 0-6 rhenium, 2.0-6.0 tungsten, and the balance being nickel, subject to the proviso that the sum of the atomic percentages of aluminum plus tantalum is within the range of from 19-22, and the ratio of atomic percentages of tantalum to aluminum plus tantalum is within the range of from 0.12 to 0.23. Embedded within the gamma nickel-base matrix are aligned eutectic gamma prime phase (primarily nickel-aluminum-tantalum) reinforcing fibers

    Remembering My Professor and My Friend: David Williams II

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    Natural Dirac Neutrinos from Warped Extra Dimension

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    Dirac neutrinos arising from gauged discrete symmetry \`a la Krauss-Wilczek are implemented in the minimal custodial Randall-Sundrum model. In the case of a normal hierarchy, all lepton masses and mixing pattern can be naturally reproduced at the TeV scale set by the electroweak constraints, while simultanously satisfy bounds from lepton flavour violation. A nonzero neutrino mixing angle, θ13\theta_{13}, is generic in the scenario, as well as the existence of sub-TeV right-handed Kaluza-Klein neutrinos, which may be searched for at the LHC.Comment: Talk given at the 2nd Young Researchers Workshop "Physics Challenges in the LHC Era", Frascati, May 10 and 13, 2010, 6 page

    Laboratory measurements of the cometary photochemical phenomena

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    Laboratory experiments are described that provide fundamental information about photochemical processes in comets. The yield of cometary radicals such as CN, OH, etc. can be determined as a function of photolyzing wavelength. Quantum state distributions of the internal energy of the cometary radicals can also be measured as a function of wavelength permitting one to define the recoil velocity of the fragments. This type of information supplies the data needed for more elaborate models to interpret the data being obtained on comets

    Nurses\u27 Alumnae Association Bulletin - Volume 3 Number 6

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    My Thirty Months in a Jap Camp Alumnae Day Hi-Lights of the Alumnae Association Meetings New Linen System at Jefferson Welcome! Miss Jackson Condolences and Miscellaneous Items A Step Forward Bits of Chatter Concerning Jefferson Streptomycin Improvements in the Nursing Arts Laboratory Thirty-Eighth General Hospital News of Teaching Staff Graduation Prizes Student Anesthetists On Furlough Graduation Staff News Changes and Improvements in the Hospital Positions Overseas Boxes Deaths Army Nurse Corps Navy Nurse Corps Marriages Engagements Marriages of Nurses Overseas New Arrivals New Addresse
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