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Your search keyword '"Bell, P.M."' showing total 107 results
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107 results on '"Bell, P.M."'

10. Laser techniques in high-pressure geophysics

Author

Hemley, R.J., Bell, P.M., and Mao, H.K.

Subjects
Raman spectroscopy -- Usage, Geophysics -- Innovations, Lasers -- Usage, High pressure research -- Research
Published
1987

15. High-pressure ruby and diamond fluorescence: observations at 0.21 to 0.55 terapascal

Author

Xu, J.A., Mao, H.K., and Bell, P.M.

Subjects
Fluorescence spectroscopy -- Research, Diamond crystals -- Research, Materials at high pressures -- Research, Diamonds -- Research, Science and technology, Research
Abstract

High-Pressure Ruby and Diamond Fluorescence: Observations at 0.21 to 0.55 Terapascal STATIC HIGH-PRESSURE EXPERIMENTS in the recent past have made possible the first measurements of the properties of solids at [...]

Published
1986

31. Blast wave diagnostic for the Petawatt laser system.

Author

Budil, K.S., Gold, D.M., Estabrook, K.G., Remington, B.a., Kane, J., Bell, P.M., Pennington, D., Brown, C., Hatchett, S., Koch, J.A., Key, M.H., and Perry, M.D.

Subjects
HIGH power lasers, ELECTROMAGNETIC waves
Abstract

Presents a diagnostic to measure the trajectory of a blast wave propagating through a plastic target for the Petawatt laser system. Generation of the blast wave by irradiation of the front surface of the target; Utilization of the streaked optical pyrometry of the blast front to determine its time of arrival at the rear surface of the target.

Published
1999
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32. Characterization of an x-ray framing camera utilizing a charge coupled device or film as recording media

Author

Logory, L.M., Farley, D.R., Conder, A.D., Belli, E.A., Bell, P.M., and Miller, P.L.

Subjects
CCD cameras, SCIENTIFIC apparatus & instruments
Abstract

Characterizes a charge coupled device camera system as a recording media. Applications of the electronic package and design of the camera system; Measurement on the contrast transfer function of the x-ray imager; Indications of the modulation transfer function plots of the device.

Published
1998
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33. Target diagnostic system for the national ignition facility (invited)

Author

Leeper, R. J., Chandler, G. A., Cooper, G. W., Derzon, M. S., Fehl, D. L., Hebron, D. E., Moats, A. R., Noack, D. D., Porter, J. L., Ruggles, L. E., Ruiz, C. L., Torres, J. A., Cable, M.D., Bell, P.M., Ciower, C. A., Hamreel, B. A., Kalantar, D. H., Karpenko, V. P., Kauffman, R. L., and Kilkenny, J.D.

Subjects
LASERS in plasma diagnostics, PLASMA diagnostics, NUCLEAR research
Abstract

Presents an update on the progress of a diagnostic system proposed for ignition target experiments on the National Ignition Facility (NIF) glass laser system. NIF system design requirements; Startup and laser validation of the NIF experimental plan; Laser characterization diagnostics; Capsule performance diagnostics.

Published
1997
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34. The flexible x-ray imager.

Author

Budil, K.S., Perry, T.S., Bell, P.M., Hares, J.D., Miller, P.L., Peyser, T.A., Wallace, R., Louis, H., and Smith, D.E.

Subjects
FRAMING cameras, X-rays
Abstract

Describes the development of a gated x-ray framing camera at the Lawrence Livermore National Laboratory in Livermore, California, for use at the Nova laser facility. Optical configurations of the flexible x-ray imager; Long gate widths; Instrument's potential use as an absolutely calibrated temperature diagnostic while in the soft x-ray framing camera configuration.

Published
1996
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35. Diabetes and hypertension

Author

Hunter, S.J. and Bell, P.M.

Abstract

Hypertension is defined as blood pressure 140/90 mm Hg or more. All patients with diabetes should have their blood pressure measured at least annually. Target blood pressure is less than 130/80 mm Hg (lower targets may be appropriate in patients with established renal disease). Angiotensin-converting enzyme inhibitors are the first-line option in most patients. Thiazides may be a reasonable choice in the elderly. Most patients require combination therapy. A, A+D, A+D+C is an appropriate stepwise protocol. Unless there are compelling indications, beta-blocker therapy should be used after other antihypertensive classes. Aspirin and statin therapy should be considered in all patients over 40 years of age.

Published
2006
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36. Insulin action and hepatic glucose cycling in Cushing's syndrome

Author

Heaney, A.P., Harper, R., Ennis, C., Rooney, D.P., Sheridan, B., Atkinson, A.B., and Bell, P.M.

Abstract

OBJECTIVE
Although it is well established that hypercortisolism causes insulin resistance, the mechanisms responsible for impaired insulin action in Cushing's syndrome are unclear. This study investigated the contribution of the glucose/glucose-6-phosphate substrate cycle (G/G6P). PATIENTS
Eight patients with Cushing's syndrome and seven control subjects were studied. All had normal fasting plasma glucose. DESIGN
Insulin action was assessed using the euglycaemic glucose clamp at insulin infusion rates of 0.4 and 2.0 mU/kg/min combined with a simultaneous infusion of [23H]- and [63-H]-glucose. Glucose/ glucose-6-phosphate cycle activity was calculated as the difference in glucose turnover rates determined separately for [23H]- and [63H]-glucose by selective enzymatic detritiation. MEASUREMENTS AND RESULTS
Exogenous glucose infusion rates required to maintain euglycaemia were significantly lower in Cushing's patients compared to controls, during the 0.4 mU/kg/min (7.8±1.2 vs 15.7±0.5 mumol/kg/min, P<0.001) and the 2.0 mU/kg/min insulin infusions (26.2±2.8 vs 51.5±3.5 mumol/kg/min, P<0.001). Endogenous glucose production was similar in both groups in the postabsorptive state (10.2±0.3 vs 10.8±0.4 mumol/kg/min, P=0.50) and suppressed to a similar degree during hyperinsulinaemia. G/G6P cycle activity was markedly increased in the Cushing's group in the postabsorptive state (5.4±1.1 vs 2.0±0.5 mumol/kg/min, P=0.028) and during the 0.4 mU/kg/min (3.2±0.6 vs 1.2±0.4 mumol/kg/min, P=0.014) and 2.0 mU/kg/min insulin infusions (3.3±0.8 vs 1.1±0.5 mumol/kg/min, P=0.049). CONCLUSIONS
Patients with Cushing's syndrome show marked peripheral insulin resistance and enhanced hepatic G/G6P cycle activity. In the fasting state increased glucose/glucose-6-phosphate cycle activity may be a protective mechanism limiting hyperglycaemia. During hyperinsulinaemia G/G6P cycle activity was increased but insulin resistance was predominantly due to reduced peripheral glucose uptake.

Published
1997
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37. Ultrahigh pressure: beyond 2 megabars and the ruby fluorescence scale

Author

Bell, P.M., Mao, H.K., and Goettel, K.

Subjects
Spectrometer -- Design and construction, Geophysical research -- Research, High pressure (Science) -- Research, Science and technology, Design and construction, Research
Abstract

The generation of static high pressures of several megabars for laboratory experimentation has been an important goal for materials science. At pressures exceeding 1 Mbar, the energy equivalent is on [...]

Published
1984

38. Development and characterization of a pair of 30--40 ps x-ray framing cameras.

Author

Bradley, D.K., Bell, P.M., Landen, O.L., Kilkenny, J.D., and Oertel, J.

Subjects
*FRAMING cameras, *LASERS
Abstract

Constructs two different high-speed framing cameras for use on NOVA and the OMEGA laser upgrades. Units based on the grating of a microchannel plate; Detector having a pore length to diameter ratio half of the other; Discussion of factors limiting the temporal resolution of each detector.

Published
1995
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39. Point projection radiography with the flexible x-ray imager

Author

Budil, K. S., Perry, T. S., Alvarez, S. A., Hargrove, D., Mazuch, J. R., Nikitin, A., and Bell, P.M.

Subjects
RADIOGRAPHY, IMAGING systems, X-rays
Abstract

Discusses improvements made to the technique of point projection radiography to make imaging at high x-ray energies feasible. Use of the flexible x-ray imager developed at the Nova laser facility; Imaging of an expanding aluminum cylinder in flight.

Published
1997
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40. Characterization of Nova plasmas using an x-ray spectrometer with temporal and spatial resolution.

Author

Back, C.A., Kaufman, R.L., Bell, P.M., and Kikenny, J.D.

Subjects
PLASMA gases, SPECTRUM analysis, INERTIAL confinement fusion
Abstract

Describes the application of spectroscopic diagnostics to obtain high temperature measurements of plasmas created in inertial confinement fusion targets. Advantages of spectrographs with gated technology by coupling a Bragg crystal to a microchannel plate; Action of the crystal in dispersing the x-rays.

Published
1995
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