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  • 1
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 49 (1977), S. 497-499 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0509
    Keywords: Key words: Portal vein velocities—TIPS—Ultrasound—Shunt.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background: To assess the usefulness of following portal vein velocities by Doppler ultrasound in evaluating shunt functioning after transhepatic intrajugular portosystemic shunt (TIPS) placement and revision. Methods: We retrospectively analyzed 39 patients who underwent a TIPS procedure in the preceding 4 years. Portal vein (PV) velocities were measured by Doppler ultrasound before and after TIPS insertion and revision and were correlated with portosystemic gradients (PSG) measured at angiography. Results: Mean PV velocities increased from 18 ± 6 cm/s before TIPS placement to 50 ± 21 cm/s (p 〈 0.001) after TIPS placement, with corresponding decrease of mean PSG from 20 ± 6 to 8 ± 3 mmHg (p 〈 0.001). Mean PV velocities significantly increased from 24 ± 6 to 43 ± 14 cm/s after TIPS revision (p 〈 0.02), with decrease of PSG from 17 ± 6 to 9 ± 5 mmHg (p 〈 0.05). A significant correlation was found between all PV velocities and their corresponding PSG (Spearman r 〈 0.61, p 〈 0.001). Conclusion: PV velocities significantly correlate with changes in PSG. Following portal vein velocities by ultrasound is useful for early evaluation of shunt functioning following TIPS.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Analytica Chimica Acta 261 (1992), S. 375-380 
    ISSN: 0003-2670
    Keywords: Ascorbic acid ; Flow system ; Fruit juices ; Soft drinks ; Voltammetry
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Fluid Mechanics 3 (1971), S. 189-210 
    ISSN: 0066-4189
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 29 (1986), S. 368-371 
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Three sufficient conditions for stability are established for a general class of rotating flows with the velocity and the density distribution varying in both the axial and radial directions. Two are the classical Richardson criteria in the axial and radial directions. The third, measured by a newly defined Richardson number, acts as a constraint on the other two. The newly defined Richardson number is a ratio between the interaction of the density variations with the force fields and the interaction of the velocity gradients in two directions. The former interaction is a result of the pressure restraint condition and is measured by a new Brunt–Väisälä frequency. The latter interaction determines whether the velocity gradients in the second direction strengthen or weaken the resultant shear effect. Because of the generality of the flow profiles being considered, the criteria established in this investigation are valid for a wide range of problems in oceanographic and atmospheric studies.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 29 (1986), S. 1326-1328 
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Stability conditions for an adiabatic compressible swirling flow in the presence of a toroidal magnetic field is investigated. In the absence of all the dissipative mechanisms, the flow is found to be stable to all small axisymmetric perturbations if the local Richardson number is equal to or greater than 1/4 throughout the flow domain.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 8 (1996), S. 3023-3056 
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Internal vortex patterns and the corresponding free surface signatures generated in the late wakes by a submerged sphere moving in a stratified fluid are numerically simulated by a three-dimensional time-dependent model. The flow is assumed to be incompressible and hydrostatic with the Boussinesq approximation. A free surface is included to admit barotropic modes and to investigate the surface signature of internal vortices. The turbulent mixing is modeled using the Smagorinsky formula for horizontal fluxes and a Richardson number closure for vertical fluxes. The numerical techniques include a second-order finite difference scheme with a staggered and stretched grid system. A split-explicit method is used to separately integrate the fast barotropic modes and the slow baroclinic modes in time. This method allows us to economically simulate the time history of the slowly evolving vortices. Preliminary results for the velocity field, the flow pattern, the density distribution, and the induced surface signature are presented. They consistently reveal the existence of coherent structures in the stratified flow field. Sensitivity studies are performed to examine how the depth of submerged objects, the depth of channel floors, and the size of moving objects affect the evolution of the horizontal vortices. A mechanism based on the interaction of the wake vorticity and the buoyancy induced oscillation is proposed for the generation and growth of the horizontal vortices in stratified fluids. The vorticity stretching thus produced in the direction of stratification is responsible for the generation and evolution of concentrated vortices in stratified fluids. This mechanism explains why the horizontal vortices appear long after the initial disturbances generated by a submerged moving body have dissipated, and why they exist only in stratified fluids but not in homogeneous media. In view of the proposed mechanism, the horizontal vortices are buoyancy-induced and a model with the stratification properly represented is required to adequately describe the organized vortex motion in stratified wakes. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    British journal of educational technology 24 (1993), S. 0 
    ISSN: 1467-8535
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Education
    Notes: The reliability and predictive validity of a short form of Honey and Mumford's Learning Styles Questionnaire were examined. Students' learning preferences were measured by self-report ratings on their degree of likings for 19 teaching and learning activities commonly used in higher and professional education. Subjects were 381 second-year undergraduates enrolled in accountancy, engineering and communication programmes at the Hong Kong Polytechnic. The alpha coefficients for the four learning styles scales were quite low, ranging from 0.311 for the Pragmatist scale to 0.421 for the Reflector scale. Factor analysis of the items did not reveal any coherent factor structure congruent with the underlying constructs. However, significant though weak correlations were found between the learning styles scores and the learning preferences of the students as hypothesised.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Nuclear Instruments and Methods in Physics Research Section A: 350 (1994), S. 150-173 
    ISSN: 0168-9002
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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