36,010 research outputs found

    Bounded homotopy theory and the KK-theory of weighted complexes

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    Given a bounding class BB, we construct a bounded refinement BK()BK(-) of Quillen's KK-theory functor from rings to spaces. BK()BK(-) is a functor from weighted rings to spaces, and is equipped with a comparison map BKKBK \to K induced by "forgetting control". In contrast to the situation with BB-bounded cohomology, there is a functorial splitting BK()K()×BKrel()BK(-) \simeq K(-) \times BK^{rel}(-) where BKrel()BK^{rel}(-) is the homotopy fiber of the comparison map.Comment: 25 pages, 13 diagrams; comments welcom

    Feasibility study to determine methods of measuring the temperature of a molecular beam Final report

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    Molecular beam sampling technique for temperature measurement of earth thermospher

    Development of an accurate wide range ultra high vacuum gauge calibration method, 29 June 1966 - 28 February 1968

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    Calibration method and ultrahigh vacuum components for ionization gage and mass spectromete

    Bit error rate measurement above and below bit rate tracking threshold

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    Bit error rate is measured by sending a pseudo-random noise (PRN) code test signal simulating digital data through digital equipment to be tested. An incoming signal representing the response of the equipment being tested, together with any added noise, is received and tracked by being compared with a locally generated PRN code. Once the locally generated PRN code matches the incoming signal a tracking lock is obtained. The incoming signal is then integrated and compared bit-by-bit against the locally generated PRN code and differences between bits being compared are counted as bit errors

    Development of an accurate wide range ultra high vacuum gauge calibration method

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    Accurate wide range ultrahigh vacuum gauge calibration method using pressure attenuation, atomic beam, and cryopumping techniques to evaluate system components and performanc
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