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Behavior of high energy ions in the GAMMA 10 tandem mirror : Proceedings of the 12th topical conference on high temperature plasma diagnostics (1999)

Ichimura, M. ; Satake, C. ; Sakata, K. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 70 (1999), S. 834-837

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ISSN: 1089-7623

Source: AIP Digital Archive

Topics: Physics , Electrical Engineering, Measurement and Control Technology

Notes: In the GAMMA 10 tandem mirror, ion cyclotron range of frequency heating has been used effectively in the central cell. The ion temperature becomes several keV and an ion beta value is a few %. Semiconductor detectors are used for measurement of high energy protons in both parallel and perpendicular directions to the magnetic field line. Observed pitch angle distribution peaks near the cyclotron resonance layer and estimated pressure profile in the axial direction is consistent with the profile from a diamagnetic loop array. Strong temperature anisotropy can drive an Alfvén ion cyclotron (AIC) mode unstable. In a typical discharge, the temporal evolution of the endloss high energy ions has strong correlation with that of the AIC-mode amplitude. The enhancement of the loss of high energy ions due to the AIC mode is suggested. © 1999 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.1149491

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Biochemical Markers of Bone Turnover and Bone Loss at the Lumbar Spine and Femoral Neck: The Taiji Study (1999)

Yoshimura, N. ; Hashimoto, T. ; Sakata, K. ; [et al.]

Springer

Calcified tissue international 65 (1999), S. 198-202

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ISSN: 1432-0827

Keywords: Key words: Bone metabolic markers — Predictor — Osteoporosis — Epidemiology — Bone mineral density.

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine , Physics

Notes: Abstract. The purpose of this study was to ascertain whether biochemical markers of bone turnover predict bone loss. The survey was carried out in Taiji, Wakayama Prefecture, Japan. From a list of inhabitants aged 40–79 years, 400 participants (50 men and 50 women in each of four age groups) were selected randomly. Bone mineral density (BMD) was measured, and blood and urine samples of all participants were examined to obtain values for eight biochemical markers: alkaline phosphatase (ALP), bone Gla protein (BGP), type I procollagen (carboxyterminal peptide of type I procollagen; PICP), cross-linked carboxyterminal telopeptide region of type I collagen (ICTP), and urinary excretion of calcium (Ca), phosphate (P), pyridinoline (Pyr), and deoxypyridinoline (D-Pyr). Each marker was evaluated as a predictor of the rate of bone change in lumbar spine and femoral neck BMD over a 3-year period. The value of Pyr was significantly related to the change of lumbar spine BMD in men (P= 0.009), and that of BGP was found to be significant in women (P= 0.045). By contrast, none of the bone markers significantly correlated with bone loss at the femoral neck. The coefficient of determination at the lumbar spine was 5% and 7% at the femoral neck only. We conclude that biochemical markers of bone turnover cannot predict bone loss rates in middle-aged or elderly Japanese men and women over a 3-year period with sufficient accuracy for use in clinical decision making.