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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Abdominal imaging 19 (1994), S. 349-354 
    ISSN: 1432-0509
    Keywords: Defecography, technique ; Anorectal disorders, management
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We reviewed the medical records and defecograms in 55 consecutive patients to determine the impact of results of defecography on clinical management. Main indication for defecography was constipation, present in 40 (73%) of 55 patients. In the remaining 15 patients, indications included obstructed defecation (5), incontinence (5), and miscellaneous symptoms (5). Defecography evaluated pelvic floor motion by assessing changes in the anorectal angle (ARA) and anorectal junction (ARJ) during various maneuvers, extent of evacuation, and structural abnormalities. Patients were grouped based on results of defecography as being normal (26) or abnormal (29). Comparison of measurements of the ARA and ARJ with various maneuvers showed no significant differences between the two groups. Clinical impact was determined by analyzing therapy done following defecography and subsequent patient response. In the normal group, 15 patients were managed medically, seven surgically, and four lost to follow-up. Clinical improvement occurred in 13 (59%) of 22 patients, with similar results between medical (60%) and surgical (57%) therapy. In the abnormal group, 16 had medical management, seven surgical therapy, and six lost to follow-up. Clinical improvement occurred in 13 (57%) of 23 patients but surgical therapy showed more improvement. In conclusion, most standard measurements of the ARA and ARJ were of no value in determining abnormality. Results of defecography did not alter selection of medical or surgical therapy, and had little impact on patient response to therapy.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 208 (1965), S. 1198-1199 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] (1) Thermoluminescence. The samples were prepared as cylindrical pellets of diameter 1-25 cm and depth 1 mm, formed under pressures of about 4 tons/in2. Following irradiation in silicate glass tubes, in the presence of oxygen, glow curves were recorded using a technique identical to that described ...
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 30 (1987), S. 2343-2353 
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The alignment between vorticity and eigenvectors of the strain-rate tensor in numerical solutions of Navier–Stokes turbulence is studied. Solutions for isotropic flow and homogeneous shear flow from pseudospectral calculations using 1283 grid points have been examined. The Taylor Reynolds number is 83 or greater. In both flows there is an increased probability for the vorticity to point in the intermediate strain direction and at three-fourths of the sample points this strain is positive (extensive). This propensity for vorticity alignment with a positive intermediate strain is a consequence of angular momentum conservation, as shown by a restricted Euler model of the coupling between strain and vorticity. Probability distributions for intermediate strain, conditioned on total strain, change from a symmetric triangular form at small strain to an asymmetric one for large strain. The most probable value of the asymmetric distribution gives strains in the ratios of 3:1: −4. The evolution of the distribution from a symmetric to an asymmetric form as the strain magnitude increases is essentially the same in both flows, indicating a generic structure of intense turbulence. The alignment between the gradient of a passive scalar and eigenvectors of the strain-rate tensor for Prandtl numbers of 0.1, 0.2, 0.5, and 1.0 has also been studied. There is an increased probability for the scalar gradient to align in the most compressive strain direction, and the average gradient is larger when it is pointing in that direction. Estimates for the scalar dissipation from the turbulent kinetic energy, its dissipation, and the root-mean-square scalar value are in reasonable agreement with calculated scalar dissipation if no explicit Prandtl number dependence is used in the estimate. Statistical analysis of scalar dissipation conditioned on energy dissipation yields a power-law relation between conditioned mean values. Both simulated flows are found to obey the qualitative predictions of the Gurvich–Yaglom (lognormal) intermittency model. Energy and scalar intermittency exponents are estimated and compared to measured values.
    Type of Medium: Electronic Resource
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