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  • 1
    Electronic Resource
    Electronic Resource
    Temporal and spatial unmixedness downstream of a plate array (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 12 (2000), S. 1497-1508 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of a plate array on a turbulent velocity and turbulent concentration field is determined. Profiles of mean and root-mean-square velocity and concentration, profiles of temporal and spatial unmixedness, and profiles of the variance of the gradient of velocity and the variance of the gradient of concentration are presented. Velocity and concentration integral length scales are compared. A biplane injection grid is used to produce the turbulent concentration and turbulent velocity field. Helium is injected through the jets at the grid nodes as air passes through the grid. The time-resolved velocity and concentration data are obtained using a two-sensor probe that consists of a hot wire and a TSI 1440-20 aspirating concentration probe. The addition of a plate array is shown to decrease the spatial unmixedness to a nearly zero value in about half the downstream distance observed without plates. Further, an increase in dissipation is shown with the array in place that reduces the temporal unmixedness to a value less than the value observed without the plates in about one-third the downstream distance. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870398
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  • 2
    Electronic Resource
    Electronic Resource
    A valve with seat-slope proportional to flow area at all poppet positions (1991)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 247-248 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An adjustable gas-blending apparatus is hypothesized that would maintain a consistent mixture over a broad range of flowrates. The design equations for the unique valve seat required for such an apparatus are developed and solved numerically. An example seat is calculated and illustrated in table form. For preliminary study, a prototype is constructed and empirical data are presented which substantiate the design.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142325
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  • 3
    Electronic Resource
    Electronic Resource
    Preliminary results of the 14 GHz SERSE superconducting electron cyclotron resonance ion source working in high-B mode : Proceedings of the 7th international conference on ion sources (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 653-655 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: After the first operation of the SERSE superconducting source assembled with reduced performance coils, the tests of the new SERSE magnetic system were carried out with excellent results. The specifications of the design field were reached and exceeded. The new coils were mounted and SERSE is now able to run at full performance magnetic field. The today's status of the facility, electron cyclotron resonance source and new magnetic configuration, is described. The first tests as a multicharged ion source have just started, and a few preliminary results are given and commented. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148625
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  • 4
    Electronic Resource
    Electronic Resource
    Summary of the performances of the superconducting electron cyclotron resonance ion source at 14 GHz (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 4082-4085 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: This article deals with the most recent performance of the superconducting electron cyclotron resonance ion source (SERSE) working at 14 GHz with high magnetic fields after the required conditioning and optimization of several operating parameters. SERSE has now achieved an outstanding level of performance in delivering highly charged ion beams in argon and oxygen gases: the results obtained while operating in a stainless steel chamber and with an aluminum liner are shown and discussed. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149254
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  • 5
    Electronic Resource
    Electronic Resource
    Two Isoenzymes of Na+, K+-ATPase Have Different Kinetics of K+ Dephosphorylation in Normal Cat and Human Brain Cortex (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 54 (1990), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: Analysis of purified Na+, K+-ATPase from cat and human cortex by sodium dodecyl sulfate-polyacrylamide gel electrophoresis reveals two large catalytic subunits called α(-) (lower molecular weight) and α(+) (higher molecular weight). Differences in K+ dephosphorylation of these two molecular forms have been investigated by measuring the phosphorylation level of each protein after their separation on sodium dodecyl sulfate gels. In the presence of Na+, Mg2+, and ATP, both subunits are phosphorylated. Increasing concentrations (from 0 to 3 mM) of K+ induce progressive dephosphorylation of both α-subunits, although the phosphoprotein content of α(-) is decreased significantly less than that of α(+). Ka values of α(-) for K+ are 40% and 50% greater in cat and human cortex, respectively, than values of α(+), α(-) and α(+) are thought to be localized in specific cell types of the brain: α(-) is the exclusive form of nonneuronal cells (astrocytes), whereas α(+) is the only form of axolemma. Our results support the hypothesis that glial and neuronal Na+, K+-ATPases are different molecular entities differing at least by their K+ sensitivity. Results are discussed in relation to the role of glial cells in the regulation of extracellular K+ in brain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1990.tb13292.x
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  • 6
    Electronic Resource
    Electronic Resource
    Improving the efficiency of a jet pump using an elliptical nozzle (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 4727-4729 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: This note presents a unique means of increasing the efficiency of a jet pump. Much research has been devoted to the study of elliptical nozzles on jets and their ability to increase the amount of fluid entrainment over round jets with equal perimeters. Since the efficiency of a jet pump is directly related to the ability of the primary jet to entrain fluid, a jet pump is an obvious potential application of these elliptical nozzles. In this study, the efficiency of a jet pump is measured using a jet with a round cross section and a jet with an elliptical cross section that has a 3:1 aspect ratio. At high flowrates, the jet pump using the elliptical jet is shown to have an efficiency that is approximately a factor of 6 greater than the pump using the round jet. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150141
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  • 7
    Electronic Resource
    Electronic Resource
    A strain gage-variable area flowmeter (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 1522-1524 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: This article presents a unique hybrid flowmeter that combines the turndown ratio/low resistance benefits of a variable area differential pressure flowmeter with the low component simplicity of a target flowmeter. The design attaches a single element strain gage to the flexural membrane suspended in a fluid flow passage, eliminating the need for force or pressure transducers. A prototype of the concept produced favorable results that conformed well to a theoretical model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141164
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  • 8
    Electronic Resource
    Electronic Resource
    Dimensional considerations for small-bore water manometers (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 3062-3064 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: When designing or experimenting with time-responsive slant manometers requiring small bore, the capillary effects which can change the height of the meniscus need to be considered. This article explores the governing manometer-design equations and investigates each design parameter's role in causing a capillary height change. The most significant parameter is the tube's degree of incline from the vertical. As the tube is inclined from this position, the capillary effect is lessened, but must still be considered. The design equations derived below yield straightforward guidelines for limitations on a manometer tube's internal diameter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140604
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  • 9
    Electronic Resource
    Electronic Resource
    Gas pressure reduction circuits (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 3820-3821 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: This note describes passive pressure reduction devices for use with sensitive instruments. Two gas circuits are developed which not only provide a pressure reduction under flow demand, but also limit the maximum pressure that the source can exert under a no-flow condition. The first design approach presented is a method that involves conventional orifices in a pressure divider network analogous to a voltage divider in electronics. The second method detailed, utilizing the discharge end of a jet pump, amplifies the mass flow rate of the source, reduces the source pressure at free delivery, and limits the pressure at shutoff.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140447
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  • 10
    Electronic Resource
    Electronic Resource
    Demonstrating the achievement of lower temperatures with two-stage vortex tubes (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 3446-3448 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Vortex tubes separate single inlet streams of compressed air into two discharge streams. One stream exits at a lower temperature than the inlet stream, and the other exits at a higher temperature. The difference between the lower outlet temperature and the inlet temperature is ΔT. This study demonstrates that with equal inlet temperatures, a two-stage vortex tube (i.e., two vortex tubes operating simultaneously in series) can produce a greater ΔT than the ΔT produced by either one of the vortex tubes operating independently. Specifically, results demonstrate that two single-stage tubes that have ΔT values, which are, respectively, −17.37 and −16.17 °C, can be combined into a two-staged vortex tube that has a ΔT of −19.33 °C. Thus, the cooling capability of a vortex tube can be increased by staging. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1384430
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