10,253 research outputs found
Topological Quantum Field Theory and Seiberg-Witten Monopoles
A topological quantum field theory is introduced which reproduces the
Seiberg-Witten invariants of four-manifolds. Dimensional reduction of this
topological field theory leads to a new one in three dimensions. Its partition
function yields a three-manifold invariant, which can be regarded as the
Seiberg-Witten version of Casson's invariant. A Geometrical interpretation of
the three dimensional quantum field theory is also given.Comment: 15 pages, Latex file, no figure
China’s Comprehensive Strategic and Cooperative Partnership with Africa
Convened in South Africa in December 2015, the 6th Summit Meeting of the
Forum on China–Africa Cooperation (FOCAC) culminated in the Johannesburg
Action Plan under the theme ‘China–Africa Progressing Together: Win-Win
Cooperation for Common Development’. An accompanying declaration upgraded
FOCAC to a ‘new type of comprehensive strategic and cooperative partnership’,
linking Africa’s transformation aspirations to China’s own ongoing transformation.
This IDS Policy Briefing investigates the content of the Johannesburg Action Plan;
examines its geopolitical, intellectual and systemic dimensions; and identifies
wider policy implications.UK Department for International Developmen
Remote sensing techniques for mapping range sites and estimating range yield
Image interpretation procedures for determining range yield and for extrapolating range information were investigated for an area of the Pine Ridge Indian Reservation in southwestern South Dakota. Soil and vegetative data collected in the field utilizing a grid sampling design and digital film data from color infrared film and black and white films were analyzed statistically using correlation and regression techniques. The pattern recognition techniques used were K-class, mode seeking, and thresholding. The herbage yield equation derived for the detailed test site was used to predict yield for an adjacent similar field. The herbage yield estimate for the adjacent field was 1744 lbs. of dry matter per acre and was favorably compared to the mean yield of 1830 lbs. of dry matter per acre based upon ground observations. Also an inverse relationship was observed between vegetative cover and the ratio of MSS 5 to MSS 7 of ERTS-1 imagery
Radar cross calibration investigation TAMU radar polarimeter calibration measurements
A short pulse, 20 MHz bandwidth, three frequency radar polarimeter system (RPS) operates at center frequencies of 10.003 GHz, 4.75 GHz, and 1.6 GHz and utilizes dual polarized transmit and receive antennas for each frequency. The basic lay-out of the RPS is different from other truck mounted systems in that it uses a pulse compression IF section common to all three RF heads. Separate transmit and receive antennas are used to improve the cross-polarization isolation at each particular frequency. The receive is a digitally controlled gain modulated subsystem and is interfaced directly with a microprocesser computer for control and data manipulation. Antenna focusing distance, focusing each antenna pair, rf head stability, and polarization characteristics of RPS antennas are discussed. Platform and data acquisition procedures are described
Two cases of fungal keratitis caused by Metarhizium anisopliae
We present two cases of keratitis due to Metarhizium anisopliae in geographically separated areas of the United States. The isolates were microscopically similar but morphologically different and were identified by ribosomal DNA sequencing. Both isolates had low minimum inhibitory concentration (MIC) values to caspofungin and micafungin, but high MIC values to amphotericin B. The morphologic and antifungal susceptibility differences between the two isolates indicate possible polyphylogeny of the group. Keywords: Metarhizium, Fungal keratitis, Keratomycosis, Antifungal susceptibilit
Supersymmetry and the Anomalous Anomalous Magnetic Moment of the Muon
The recently reported measurement of the muon's anomalous magnetic moment
differs from the standard model prediction by 2.6 standard deviations. We
examine the implications of this discrepancy for supersymmetry. Deviations of
the reported magnitude are generic in supersymmetric theories. Based on the new
result, we derive model-independent upper bounds on the masses of observable
supersymmetric particles. We also examine several model frameworks. The sign of
the reported deviation is as predicted in many simple models, but disfavors
anomaly-mediated supersymmetry breaking.Comment: 4 pages, 4 figures, version to appear in Phys. Rev. Let
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