1,720,986 research outputs found
Inhomogeneous capillary flow of non-Newtonian Fluid;The behavior of velocity enhancement factor
No full textA miniature direct methanol fuel cell using platinum sputtered microcolumn electrodes with limited amount of fuel
No full textMems-based direct methanol fuel cells and their stacks using a common electrolyte sandwiched by reinforced microcolumn electrodes
No full textNew plasma Hall effect magnetic sensors: macrosensors versus microsensors
No full textThis paper is the first attempt to use the plasma Hall effect for magnetic field detection. The plasma Hall sensor measures the Hall voltage induced by ac electrons plasma in the magnetic field. In a theoretical analysis, we develop an analytical model of the plasma Hall sensor in order to express the plasma Hall voltage as a function of electrode geometry, magnetic field, plasma discharge field, and fluid pressure. On these bases, we have designed, fabricated, and characterized the neon plasma Hall sensors in the macroscale as well as those in the microscale. The plasma Hall macrosensor, using steel wire electrodes in a low-pressure chamber, shows a magnetic field sensitivity of 136.7 +/- 10.1 mV/G with 8.43% nonlinearity at a neon pressure of 80 +/- 5 Torr for a circuit gain of 15.56. The macrosensor, however, shows long-term instability due to the neon pressure instability in the vacuum chamber, which motivates the research on the plasma Hall microsensor. The plasma Hall microsensors using the electroplated copper electrodes in on-chip vacuum package show a magnetic field sensitivity of 8.87 +/- 0.18 mV/G with 4.48% nonlinearity at a neon pressure of 7 +/- 1 Torr for a circuit gain of 5.5. The microsensor shows good stability for 12 h. Fundamental characteristics of the macrosensors and microsensors are compared and discussed, thus verifying the feasibility of the plasma Hall sensor for a new class of magnetic microsensor. (C) 2001 Elsevier Science B.V. All rights reserved
Highly efficient production of docosahexaenoic acid by Aurantiochytrium sp. KRS 101 using cheese whey
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Affective Communication System with Multimodality and Its Application to a Humanoid Robot, AMI
No full textDesign and Development of Humanoid Robot AMI For Emotional Communication and Intelligent Housework
No full textThe behavior of velocity enhancement in microcapillary flows of flexible water-soluble polymers.
No full textA concentration depletion is developed nearby a capillary wall from the result of flow-induced radial migration to the axis region of capillary incorporating with the chain extension, The velocity enhancement factor can be defined quantifying the migration of polymers. For the experimental observation of the radial migration, the capillary hydrodynamic fractionation (CHDF) system has been adopted as a probe on the microcapillary flow of water-soluble flexible polymers. As a practical implication, the migration phenomena may lead to apply this system due to the possible alteration of the elution characteristics. In order to verify the experimental results more accurately, a model has been provided based on the diffusion equation and the conformation-dependent friction involving a radial dependence of hydrodynamic force on the dumbbell extension, For the nonionic polyacrylamide, the experimental behavior of velocity enhancement was shown to be in accordance with the present model within the somewhat increased We, In case of the anionic polyelectrolyte with 30% hydrolyzed polyacrylamide, the increasing slopes of velocity enhancement are different with the eluant ionic strength. Note that the experimental data allow us to consider an enhanced migration due to the long-ranged repulsive force between capillary wall and polymer
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