Angela C. Taylor

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BACKGROUND Weak health information systems (HIS) are a critical challenge to reaching the health-related Millennium Development Goals because health systems performance cannot be adequately assessed or monitored where HIS data are incomplete, inaccurate, or untimely. The Population Health Implementation and Training (PHIT) Partnerships were established in(More)
We present deep Ka-band (ν ≈ 33 GHz) observations of the CMB made with the extended Very Small Array. This array produces a synthesized beam width (FWHM) of ∼ 11 arcmin and covers an ℓ-range of 300 to 1500. On these scales, foreground extragalactic sources can be a major source of contamination to the CMB anisotropy. This problem has been alleviated by(More)
We have observed the cosmic microwave background in three regions of sky using the Very Small Array at 34 GHz. A total area of 101 square degrees has been imaged on angular scales of 3 • .6–0 • .4 (angular multipoles ℓ=150–900). Primordial anisotropies are detected at high significance in all three regions, and the signals seen in overlapping pointings(More)
The Very Small Array (VSA) is a synthesis telescope designed to image faint structures in the cosmic microwave background on degree and sub-degree angular scales. We have tested the operation of the VSA with a variety of blank-field and calibrator observations and cross-checked its calibration scale against independent measurements. We find that systematic(More)
We describe the design and expected performance of Clover, a new instrument designed to measure the B-mode polarization of the cosmic microwave background. The proposed instrument will comprise three independent telescopes operating at 90, 150 and 220 GHz and is planned to be sited at Dome C, Antarctica. Each telescope will feed a focal plane array of 128(More)
Clover is a new instrument being built to detect the B-mode polarization of the CMB. It consists of three telescopes operating at 97, 150, and 220 GHz and will be sited in Chile at the Llano de Chajnantor. Each telescope assembly is scaled to give a constant beam size of 8 arcmin and feeds an array of between 320 and 512 finline-coupled TES bolometers. Here(More)
We investigate the constraints on basic cosmological parameters set by the first compact-configuration observations of the Very Small Array (VSA), and other cos-mological data sets, in the standard inflationary ΛCDM model. Using a weak prior 40 < H 0 < 90 km s −1 Mpc −1 we find that the VSA and COBE data alone produce the constraints Ω tot = 1.03
We constrain the basic comological parameters using the first observations by the Very Small Array (VSA) in its extended configuration, together with existing cosmic microwave background data and other cosmological observations. We estimate cosmological parameters for four different models of increasing complexity. In each case, careful consideration is(More)
We estimate cosmological parameters using data obtained by the Very Small Array (VSA) in its extended configuration, in conjunction with a variety of other CMB data and external priors. Within the flat ΛCDM model, we find that the inclusion of high resolution data from the VSA modifies the limits on the cosmological parameters as compared to those suggested(More)