The Spring 1985 high precision baseline test of the JPL GPS-based geodetic system

The Spring 1985 High Precision Baseline Test (HPBT) was conducted. The HPBT was designed to meet a number of objectives. Foremost among these was the demonstration of a level of accuracy of 1 to 2:10 to the 7th power, or better, for baselines ranging in length up to several hundred kilometers. These objectives were all met with a high degree of success, with respect to the demonstration of system accuracy in particular. The results from six baselines ranging in length from 70 to 729 km were examined for repeatability and, in the case of three baselines, were compared to results from colocated VLBI systems. Repeatability was found to be 5:10 to the 8th power (RMS) for the north baseline coordinate, independent of baseline length, while for the east coordinate RMS repeatability was found to be larger than this by factors of 2 to 4. The GPS-based results were found to be in agreement with those from colocated VLBI measurements, when corrected for the physical separations of the VLBI and CPG antennas, at the level of 1 to 2:10 to the 7th power in all coordinates, independent of baseline length. The results for baseline repeatability are consistent with the current GPA error budget, but the GPS-VLBI intercomparisons disagree at a somewhat larger level than expected. It is hypothesized that these differences may result from errors in the local survey measurements used to correct for the separations of the GPS and VLBI antenna reference centers

The experiences and perspectives of overseas trained speech and language therapists working in the United Kingdom

There is a growing body of research which has investigated the experience of the migrant health worker. However, only one of these studies has included speech and language therapists thus far, and then only with extremely small numbers. The aim of this study was to explore the experiences and perspectives of migrant speech and language therapists living in the UK. Twenty-three overseas qualified speech and language therapists living in the UK completed an online survey consisting of 36 questions (31 closed question, 5 open-ended questions). The majority of participants came from Australia or the USA and moved to the UK early in their careers. Participants reported a range of benefits from working in another country and more specifically working in the UK. The findings were consistent with other research on migrant health workers regarding known pull factors of travel, finance, and career. This study suggests additional advantages to working in the UK were realised once participants had started working in the UK, such as the UK job lifestyle. Finally, the migrant speech and language therapists were similar in profile to other migrant health workers in terms of age and country of origin previously reported in the literature

A precise measurement of the non‐leptonic weak decay parameters α and ϕ in the spin 3/2 decay ω−→Λ0+K−

Experiment E800 at Fermilab using the E800 spectrometer has made a precise measurement of the non‐leptonic weak decay parameters for the spin 3/2 decay, Ω−→Δ°+K−. The paratmeters determined are αδαΩ=0.0126±0.0042, αΩ=0.0196±0.0066, and ϕπ=−3.4°±10.3°. This measurement of αΩ is nearly four times more precise than the previous world average value of −0.026±0.026 and shows this parameter to be inconsistent with zero. Also, E800 has made the first measurement of ϕΩ. (AIP) © 1995 American Institute of Physics.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/87479/2/692_1.pd

A precision measurement of the Ω− magnetic moment

The structure of baryons can be probed at long range by measuring their magnetic moments. The particulary simple valence quark structure (three strange quarks with their spins aligned) of the Ω− should make a precise measurments its magnetic moment a useful test of models of baryon structure. The only previous measurement of the Ω− magnetic moment to a precision of 10%, could not clearly differentiate between these models. © 1995 American Institute of Physics.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/87480/2/478_1.pd

A Study of Cosmic Ray Composition in the Knee Region using Multiple Muon Events in the Soudan 2 Detector

Deep underground muon events recorded by the Soudan 2 detector, located at a depth of 2100 meters of water equivalent, have been used to infer the nuclear composition of cosmic rays in the "knee" region of the cosmic ray energy spectrum. The observed muon multiplicity distribution favors a composition model with a substantial proton content in the energy region 800,000 - 13,000,000 GeV/nucleus.Comment: 38 pages including 11 figures, Latex, submitted to Physical Review

A transformed view of cyclosporine

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/62591/1/397471a0.pd

Polarization and spin transfer of Ω− and Ξ− hyperons at 800 GeV

Fermilab experiment E756 has measured the polarization of W− hyperons produced by 800 GeV protons to be small compared to that of Ξ− hyperons. When produced by a neutral beam containing polarized Λ and Ξ0 hyperons, both the Ω− and the Ξ− have a significant polarization indicating a large spin transfer at high energies.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/87380/2/80_1.pd