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518 results on '"Kuhlmann H"'

2. A new electromechanical trainer for sensorimotor rehabilitation of paralysed fingers: A case series in chronic and acute stroke patients

Author

Tomelleri C, Wilk J, Kuhlmann H, Hesse Stefan, and Kirker Stephen GB

Subjects
Neurosciences. Biological psychiatry. Neuropsychiatry, RC321-571
Abstract

Abstract Background The functional outcome after stroke is improved by more intensive or sustained therapy. When the affected hand has no functional movement, therapy is mainly passive movements. A novel device for repeating controlled passive movements of paralysed fingers has been developed, which will allow therapists to concentrate on more complicated tasks. A powered cam shaft moves the four fingers in a physiological range of movement. Methods After refining the training protocol in 2 chronic patients, 8 sub-acute stroke patients were randomised to receive additional therapy with the Finger Trainer for 20 min every work day for four weeks, or the same duration of bimanual group therapy, in addition to their usual rehabilitation. Results In the chronic patients, there was a sustained reduction in finger and wrist spasticity, but there was no improvement in active movements. In the subacute patients, mean distal Fugl-Meyer score (0–30) increased in the control group from 1.25 to 2.75 (ns) and 0.75 to 6.75 in the treatment group (p < .05). Median Modified Ashworth score increased 0/5 to 2/5 in the control group, but not in the treatment group, 0 to 0. Only one patient, in the treatment group, regained function of the affected hand. No side effects occurred. Conclusion Treatment with the Finger Trainer was well tolerated in sub-acute & chronic stroke patients, whose abnormal muscle tone improved. In sub-acute stroke patients, the Finger Trainer group showed small improvements in active movement and avoided the increase in tone seen in the control group. This series was too small to demonstrate any effect on functional outcome however.

Published
2008
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4. Subcritical versus supercritical transition to turbulence in curved pipes

Author

Kühnen, J., Braunshier, P., Schwegel, M., Kuhlmann, H., and Hof, B.

Subjects
Physics - Fluid Dynamics
Abstract

Transition to turbulence in straight pipes occurs in spite of the linear stability of the laminar Hagen--Poiseuille flow if the amplitude of flow perturbations as well as the Reynolds number exceed a minimum threshold (subcritical transition). As the pipe curvature increases centrifugal effects become important, modifying the basic flow as well as the most unstable linear modes. If the curvature (tube-to-coiling diameter $d/D$) is sufficiently large a Hopf bifurcation (supercritical instability) is encountered before turbulence can be excited (subcritical instability). We trace the instability thresholds in the $Re-d/D$ parameter space in the range $0.01\leq\ d/D \leq0.1$ by means of laser-Doppler velocimetry and determine the point where the subcritical and supercritical instabilities meet. Two different experimental setups were used: a closed system where the pipe forms an axisymmetric torus and an open system employing a helical pipe. Implications for the measurement of friction factors in curved pipes are discussed.

Published
2015
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5. Experimental investigation of transitional flow in a toroidal pipe

Author

Kühnen, J., Holzner, M., Hof, B., and Kuhlmann, H.

Subjects
Physics - Fluid Dynamics
Abstract

The flow instability and further transition to turbulence in a toroidal pipe (torus) with curvature (tube-to-coiling diameter) 0.049 is investigated experimentally. The flow inside the toroidal pipe is driven by a steel sphere fitted to the inner pipe diameter. The sphere is moved with constant azimuthal velocity from outside the torus by a moving magnet. The experiment is designed to investigate curved pipe flow by optical measurement techniques. Using stereoscopic particle image velocimetry, laser Doppler velocimetry and pressure drop measurements, the flow is measured for Reynolds numbers ranging from 1000 to 15000. Time- and space-resolved velocity fields are obtained and analysed. The steady axisymmetric basic flow is strongly influenced by centrifugal effects. On an increase of the Reynolds number we find a sequence of bifurcations. For Re=4075 a supercritical bifurcation to an oscillatory flow is found in which waves travel in the streamwise direction with a phase velocity slightly faster than the mean flow. The oscillatory flow is superseded by a presumably quasi-periodic flow at a further increase of the Reynolds number before turbulence sets in. The results are found to be compatible, in general, with earlier experimental and numerical investigations on transition to turbulence in helical and curved pipes. However, important aspects of the bifurcation scenario differ considerably.

Published
2015
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13. Thermocapillary Convection

Author

Kuhlmann, H. C., Kaliszky, Sandor, editor, Sayir, Mahir, editor, Schneider, Wilhelm, editor, Bianchi, Giovanni, editor, Tasso, Carlo, editor, Kuhlmann, Hendrik C., editor, and Rath, Hans-Josef, editor

Published
1998
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15. Therapy monitoring

Author

Kühne, I., Ceballos-Baumann, A. O., Conrad, B., Kruggel, F., von Einsiedel, H. Gräfin, Schneider, R., Kluge, R., Willmes, K., Stephan, K. M., Netz, J., Hömberg, V., Schönle, P. W., Schwall, D., Bischoff, C., Machetanz, J., Meyer, B.-U., Pallmann, F., Ohlmann, D., Krick, C., Jäger, H., Nachtigall, W., Schimrigk, K., Forster, J., Meyer, B. U., Bresser, B., Thomas, W., Schmitt, R. M., Mielke, U., Welsch, H. J., Lagler, E., Dillmann, U., Krämer, G., Lüder, G., Hopf, H. C., Haupt, W. F., Borberg, H., Rosenow, F., Stoll, M., Hamann, G., Donauer, E., Steudel, W. I., Elek, J. M., Orfgen, Th., Sieb, J. P., Dengler, R., Strittmatter, M., Holzer, G., Haaß, A., Rose, A., Westarp, M. E., Flügel, R. M., Bartmann, P., Fuchs, D., Hoff-Jörgensen, R., Clausen, D., Westarp, M. P., Kornhuber, H. H., Westphal, K. P., Bauer, J., Laupheimer, H., Hülser, P., Schreiber, H., Baumgärtner, K., Wollinsky, K. H., van Eick, H., Heidenreich, F., Leifeld, L., Benecke, R., Jost, Wolfgang H., Schimrigk, Klaus, Bergemann, N., Baas, H., Demisch, L., Fischer, P.-A., Alesch°, F., Fertl, E., Auff, E., Koos, W., Bauer, B., Schmidt, B., Grau, G., Henschel, S., Braus, Dieter F., Schwechheimer, Karl, Volk, Benedikt, Claus, D., Beck, E., Gmeiner, H. J., Puschmann, E., Brunhölzl, C., Jäger, W., Neundörfer, B., Seitz, R. J., Schlaug, G., Kleinschmidt, A., Reifenberger, G., Wechsler, W., Wirrwar, A., Nebeling, B., Treede, R.-D., Hansen, H. C., Kunze, K., Bufler, J., Toyka, K. V., Maelicke, A., Franke, Ch., Melms, A., Malcherek, G., Link, H., Kalbacher, H., Lindstrom, J., Oksenberg, J., Steinman, L., Müller, C., Platz, T., Denzler, P., Mauritz, K.-H., Binkofski, F., Kunesch, E., Kuhlmann, H., Hefter, H., Freund, H-J., Weindl, A., Boecker, H., Kuwert, T., Mayer, T., Winkler, B., Herzog, H., Feinendegen, L. E., Arnold, G., Eichhorn, T., Mai, N., Gasser, T., Marquard, C., Oertel, W. H., Werhahn, K. J., Fong, J., Rothwell, J. C., Shorvon, S., Thompson, P. D., Marsden, C. D., Elger, C. E., Hefner, G., Güldenberg, V., Meierkord, H., Lightman, St., Trimble, M., Jaspert, A., Spitzer, A., Grehl, H., Henningsen, H., Pause, M., Mundinger, F., Schwab, J., Günther, T., Kaendler, S. H., Enzensberger, W., Fischer, P-A., Raitzig, M., Müller, J., Zinner, J., Kasper, S., Stuerenburg, H. J., Hase, M., Hinse, P., Neunzig, P., Weis, M., Rechlin, T., Hilz, M. J., and Schimrigk, K.

Published
1992
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20. Metrology for Long Distance Surveying: A Joint Attempt to Improve Traceability of Long Distance Measurements

Author

Pollinger, F., primary, Bauch, A., additional, Meiners-Hagen, K., additional, Astrua, M., additional, Zucco, M., additional, Bergstrand, S., additional, Görres, B., additional, Kuhlmann, H., additional, Jokela, J., additional, Kallio, U., additional, Koivula, H., additional, Poutanen, M., additional, Neyezhmakov, P., additional, Kupko, V., additional, Merimaa, M., additional, Niemeier, W., additional, Saraiva, F., additional, Schön, S., additional, van den Berg, S. A., additional, and Wallerand, J.-P., additional

Published
2015
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28. Application of the life cycle assessment methodology to investigate the environmental impact of different nitrogen fertiliser application rates in a crop rotation

Author

Brentrup, F., Küsters, J., Kuhlmann, H., Horst, W. J., editor, Schenk, M. K., editor, Bürkert, A., editor, Claassen, N., editor, Flessa, H., editor, Frommer, W. B., editor, Goldbach, H., editor, Olfs, H. -W., editor, Römheld, V., editor, Sattelmacher, B., editor, Schmidhalter, U., editor, Schubert, S., editor, v. Wirén, N., editor, and Wittenmayer, L., editor

Published
2001
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29. Immobilization of fertilizer nitrogen and consequences for nitrogen fertilization of cereals

Author

Blankenau, K., Olfs, H.-W., Kuhlmann, H., Horst, W. J., editor, Schenk, M. K., editor, Bürkert, A., editor, Claassen, N., editor, Flessa, H., editor, Frommer, W. B., editor, Goldbach, H., editor, Olfs, H. -W., editor, Römheld, V., editor, Sattelmacher, B., editor, Schmidhalter, U., editor, Schubert, S., editor, v. Wirén, N., editor, and Wittenmayer, L., editor

Published
2001
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43. Phenoliner: a multi-sensor field phenotyping platform

Author

Kicherer, A., primary, Herzog, K., additional, Bendel, N., additional, Klück, H.C., additional, Backhaus, A., additional, Wieland, M., additional, Rose, J.C., additional, Klingbeil, L., additional, Kuhlmann, H., additional, Seiffert, U., additional, and Töpfer, R., additional

Published
2019
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