29,564 research outputs found

    Nimbus 6 Random Access Measurement System applications experiments

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    The advantages of a technique in which data collection platforms randomly transmit signal to a polar orbiting satellite, thus eliminating satellite interrogation are demonstrated in investigations of the atmosphere; oceanographic parameters; Arctic regions and ice conditions; navigation and position location; and data buoy development

    Prepared discussant comments

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    Banks and banking ; Bank capital ; Bank supervision ; Deposit insurance

    Coping with bank failures: some lessons from the United States and the United Kingdom

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    Bank failures ; Great Britain ; Banks and banking - History

    Financial condition of community banks

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    This article examines the condition of the banking industry in the United States, with an emphasis on community banks. In spite of the recent recession, the condition of the banking industry is substantially better than during the recession of 1990-91. There has been an increase in problem loans at both large and small banks during recent quarters, and nonperforming loans have risen relative to the allowance for loan and lease losses. Among the banks in each of the size groups in this article, however, ratios of equity to total assets in recent quarters are at about their highest levels since the early 1990s. Output of an early warning model of bank distress, which converts individual measures of bank condition into an index number, indicates a substantial improvement in the condition of community banks and larger banks after the early 1990s. While the median probability of failure has been higher for community banks than for larger banks during recent quarters, the difference is very small. Trends in the ratings that supervisors have assigned to the banks examined during recent quarters are not consistent with the view that examiners have been detecting a systematic deterioration in the condition of community banks.Community banks ; Bank supervision

    The new system of contemporaneous reserve requirements

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    Bank reserves ; Monetary policy

    The financial condition of U.S. banks: how different are community banks?

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    This article examines the condition of the banking industry in the United States, with an emphasis on community banks. In spite of the recent recession, the condition of the banking industry is substantially better than during the recession of 1990-91. There has been an increase in problem loans at both large and small banks during recent quarters, and nonperforming loans have risen relative to the allowance for loan and lease losses. Among the banks in each of the size groups in this article, however, ratios of equity to total assets in recent quarters are at about their highest levels since the early 1990s. Output of an early warning model of bank distress, which converts individual measures of bank condition into an index number, indicates a substantial improvement in the condition of community banks and larger banks after the early 1990s. While the median probability of failure has been higher for community banks than for larger banks during recent quarters, the difference is very small. Trends in the ratings that supervisors have assigned to the banks examined during recent quarters are not consistent with the view that examiners have been detecting a systematic deterioration in the condition of community banks.Banks and banking

    Accuracy thresholds of topological color codes on the hexagonal and square-octagonal lattices

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    Accuracy thresholds of quantum error correcting codes, which exploit topological properties of systems, defined on two different arrangements of qubits are predicted. We study the topological color codes on the hexagonal lattice and on the square-octagonal lattice by the use of mapping into the spin glass systems. The analysis for the corresponding spin glass systems consists of the duality, and the gauge symmetry, which has succeeded in deriving locations of special points, which are deeply related with the accuracy thresholds of topological error correcting codes. We predict that the accuracy thresholds for the topological color codes would be 1pc=0.109681-p_c = 0.1096-8 for the hexagonal lattice and 1pc=0.109231-p_c = 0.1092-3 for the square-octagonal lattice, where 1p1-p denotes the error probability on each qubit. Hence both of them are expected to be slightly lower than the probability 1pc=0.1100281-p_c = 0.110028 for the quantum Gilbert-Varshamov bound with a zero encoding rate.Comment: 6 pages, 4 figures, the previous title was "Threshold of topological color code". This is the published version in Phys. Rev.

    A local moment approach to the degenerate Anderson impurity model

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    The local moment approach is extended to the orbitally-degenerate [SU(2N)] Anderson impurity model (AIM). Single-particle dynamics are obtained over the full range of energy scales, focussing here on particle-hole symmetry in the strongly correlated regime where the onsite Coulomb interaction leads to many-body Kondo physics with entangled spin and orbital degrees of freedom. The approach captures many-body broadening of the Hubbard satellites, recovers the correct exponential vanishing of the Kondo scale for all N, and its universal scaling spectra are found to be in very good agreement with numerical renormalization group (NRG) results. In particular the high-frequency logarithmic decays of the scaling spectra, obtained here in closed form for arbitrary N, coincide essentially perfectly with available numerics from the NRG. A particular case of an anisotropic Coulomb interaction, in which the model represents a system of N `capacitively-coupled' SU(2) AIMs, is also discussed. Here the model is generally characterised by two low-energy scales, the crossover between which is seen directly in its dynamics.Comment: 23 pages, 7 figure

    Effects of high energy radiation on the mechanical properties of epoxy/graphite fiber reinforced composites

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    Publications and theses generated on composite research are listed. Surface energy changes of an epoxy based on tetraglycidyl diaminodiphenyl methane (TGDDM)/diaminodiphenyl sulfone (DDS), T-300 graphite fiber and T-300/5208 (graphite fiber/epoxy) composites were investigated after irradiation with 0.5 MeV electrons. Electron spin resonance (ESR) investigations of line shapes and the radical decay behavior were made of an epoxy based on tetraglycidyl diaminodiphenyl methane (TGDDM)/diaminodiphenyl sulfone (DDS), T-300 graphite fiber, and T-300/5208 (graphite fiber/epoxy) composites after irradiation with Co(60) gamma-radiation or 0.5 MeV electrons. The results of the experiments are discussed

    Effects of high energy radiation on the mechanical properties of epoxy graphite fiber reinforced composites

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    The effects of high energy radiation on mechanical properties and on the molecular and structural properties of graphite fiber reinforced composites are assessed so that durability in space applications can be predicted. A listing of composite systems irradiated along with the maximum radiation dose applied and type of mechanical tests performed is shown. These samples were exposed to 1/2 MeV electrons
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