627 research outputs found

    Cornundrums

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    Many English words begin with CON. These letters can be replaced by CORN without significantly altering either the pronunciation or the appearance of the words.The answers to the following riddles require the substitution of CORN for CON in some everyday terms. In order to answer the riddles correctly, one need only be able to pretend that cornstalks engage in activities similar to those that occupy the time and attention of people

    Etymology Riddles

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    With the aid of the American Heritage Dictionary of the English Language, which contains 46 pages of Indo-Eurpoean roots, one can discover that words that appear to be completely unrelated are in reality cognates. This information can be used to develop riddles that contain two or more such words. The point of an etymology riddle is that the cognate words share a common semantic element that is not readily apparent because some of the semantic and/or phonological changes that have occurred over the centuries have masked the common origin of the cognates

    Magnetic Reconnection As A Chondrule Heating Mechanism

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    Thesis (Ph.D.) University of Alaska Fairbanks, 2010The origin of chondrules (sub-millimeter inclusions found in stony meteorites) remains today an open question despite over century of examination. The age of these proto-solar relics shows a well defined cutoff of around 4.5 billion years ago. This places them as the oldest solids in the solar system. Chemical examination indicates that they experienced heating events on the order of 5000 K/hr for periods of around 30 minutes, followed by extending periods of cooling. Additional examination indicates the presence of large magnetic fields during their formation. Most attempts to explain chondrule formation in the proto-solar nebula neglect the existence of a plasma environment, with even less mention of dust being a charge carrier (dusty plasma). Simulations of magnetic reconnection in a dusty plasma are forwarded as a mechanism for chondrule formation in the proto-solar nebula. Here large dust-neutral relative velocities are found in the reconnection region. These flows are associated with the dynamics of reconnection. The high Knudsen number of the dust particles allows for a direct calculation of frictional heating due to collisions with neutrals (allowing for the neglect of boundary layer formation around the particle). Test particle simulations produce heating equivalent to that recorded in the chondrule mineral record. It is shown that magnetic reconnection in a dusty plasma is of fundamental importance to the formation of the most primitive solids in the solar system

    A Will to Live

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    Anchor entrepreneurship and industry catalysis: The rise of the Italian Biomedical Valley

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    Accounting for the rise of the medical device industry in the Emilia-Romagna town of Mirandola from a once depressed agricultural area in 1962 to a world-manufacturing center for dialysis equipment and disposable plastic medical devices, requires in large measure mapping the methods of the local entrepreneur who spearheaded its development. Reworking Agrawal and Cockburn's anchor-tenant hypothesis highlighting the role of large organizations in fostering agglomerations, this paper privileges the Schumpeterian entrepreneur as the dynamic force driving new industrial formations. This anchor-entrepreneur with no prior experience in manufacturing medical devices and without any public financing or large private backers founded six firms. Each of these would be sold off fairly quickly to a different large multinational corporation. Placing the anchor-entrepreneur at the center stage advances understanding of early industry evolution, spelling out how first-mover pioneers shape the environment to establish the first markets needed to attract new resources and capabilities. Underpinning our argument are 61 fine-grain interviews with key medical device industry informants in addition to extensive secondary sources and historical records. We draw on this material to induce a stylized model of anchor-entrepreneurship and industry catalysis that rests on three generative processes: bricolage, second-hand imprinting and beaconing

    STELLOPT Modeling of the 3D Diagnostic Response in ITER

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    The ITER three dimensional diagnostic response to an n=3 resonant magnetic perturbation is modeled using the STELLOPT code. The in-vessel coils apply a resonant magnetic perturbation (RMP) fi eld which generates a 4 cm edge displacement from axisymmetry as modeled by the VMEC 3D equilibrium code. Forward modeling of flux loop and magnetic probe response with the DIAGNO code indicates up to 20 % changes in measured plasma signals. Simulated LIDAR measurements of electron temperature indicate 2 cm shifts on the low field side of the plasma. This suggests that the ITER diagnostic will be able to diagnose the 3D structure of the equilibria
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