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841 results on '"Bähr M"'

1. Creation of diamond membranes containing nitrogen-vacancy centers by means of ion irradiation.

Author

Scheuner, C., Kuhrke, M., Lühmann, T., Kieschnick, M., Reiß, S., Engel, J., Bähr, M., Pezzagna, S., and Meijer, J.

Subjects
OPTICAL resonators, HYDROGEN ions, OPTICAL properties, FLUORESCENCE, DIAMONDS
Abstract

In this study, we investigated the creation of mono crystalline diamond membranes for use in two-dimensional optical cavities. The creation method involves ion irradiation to create a buried layer of damaged material that is removed to leave a free-standing mono crystalline top layer. Simulations were used to determine the optimal parameters for irradiation, which were tested in experiments. Hydrogen ions were found to be the optimal ion species for irradiation, and long-term high-temperature annealing was beneficial in reducing ion-induced damage in the membrane. The resulting membranes, which were 300 nm thick, contained a high density of negatively charged nitrogen-vacancy centers. Their optical and spin properties were analyzed. The findings of this study can be applied to the creation of diamond membranes hosting other color centers, with thicknesses matched to their respective fluorescence. [ABSTRACT FROM AUTHOR]

Published
2024
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2. A didactical dataset to learn supervised classification with candy

Author

Sinichenko, V. A., Bähr, M., Maximilian, M., Philip, N., Gabriele, N., Ihor, T., Jessica, A., Florian, L. C., Martina, R., Franziska, B., Yashkumar, P. F., Anna, S., Satyam, S. G., Dora, H., Asma, W., Nico, B., Tim, Q., Muhammad, H. K., Benjamin, B., Roland, N., Laura, M., Marius, P., Siddhartha, J., Tom, G., Yaqian, Z., Yan, A., Lena, S., Hamdaan, A. F., Florens, K., Shayan, P., Lukas, P., (0000-0002-4974-230X) Steinbach, P., Sinichenko, V. A., Bähr, M., Maximilian, M., Philip, N., Gabriele, N., Ihor, T., Jessica, A., Florian, L. C., Martina, R., Franziska, B., Yashkumar, P. F., Anna, S., Satyam, S. G., Dora, H., Asma, W., Nico, B., Tim, Q., Muhammad, H. K., Benjamin, B., Roland, N., Laura, M., Marius, P., Siddhartha, J., Tom, G., Yaqian, Z., Yan, A., Lena, S., Hamdaan, A. F., Florens, K., Shayan, P., Lukas, P., and (0000-0002-4974-230X) Steinbach, P.

Abstract

A didactical dataset to learn supervised classification It was obtained from university level students measuring candy that was mixed and distributed in bowls to them. The goal of this dataset creation was to expose the students to the data taking process. Further, the dataset is meant for classificatio

Published
2024

5. Summary of the Workshop on Multi-Parton Interactions (MPI@LHC 2012)

Author

Abramowicz, H., Bartalini, P., Baehr, M., Cartiglia, N., Ciesielski, R., Dobson, E., Ferro, F., Goulianos, K., Guiot, B., Janssen, X., Jung, H., Karpenko, Iu., Kaspar, J., Katzy, J., Krauss, F., Laycock, P., Levin, E., Mangano, M., Mesropian, Ch., Moraes, A., Myska, M., Moran, D., Muresan, R., Nagy, Z., Pierog, T., Pilkington, A., Poghosyan, M., Rogers, T., Sen, S., Seymour, M. H., Siodmok, A., Strikman, M., Skands, P., Treleani, D., Volyanskyy, D., Werner, K., and Wijeratne, P.

Subjects
High Energy Physics - Phenomenology
Abstract

With short resumes and highlights the discussions in the different working groups of the workshop MPI@LHC 2012 is documented.

Published
2013

7. The effect of magnetic dipolar interactions on the interchain spin wave dispersion in CsNiF_3

Author

Baehr, M., Winkelmann, M., Vorderwisch, P., Steiner, M., Pich, C., and Schwabl, F.

Subjects
Condensed Matter
Abstract

Inelastic neutron scattering measurements were performed on the ferromagnetic chain system CsNiF_3 in the collinear antiferromagnetic ordered state below T_N = 2.67K. The measured spin wave dispersion was found to be in good agreement with linear spin wave theory including dipolar interactions. The additional dipole tensor in the Hamiltonian was essential to explain some striking phenomena in the measured spin wave spectrum: a peculiar feature of the dispersion relation is a jump at the zone center, caused by strong dipolar interactions in this system. The interchain exchange coupling constant and the planar anisotropy energy were determined within the present model to be J'/k_B = -0.0247(12)K and A/k_B = 3.3(1)K. This gives a ratio J/J' \approx 500, using the previously determined intrachain coupling constant J/k_B = 11.8$. The small exchange energy J' is of the same order as the dipolar energy, which implies a strong competition between the both interactions., Comment: 18 pages, TeX type, 7 Postscript figures included. To be published in Phys. Rev. B

Published
1996
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8. John Dewey: Lernen und Demokratie

Author

Bähr, Matthias Ernst, Sölch, Dennis, Bähr, M E ( Matthias Ernst ), Sölch, D ( Dennis ), Oelkers, Jürgen, Bähr, Matthias Ernst, Sölch, Dennis, Bähr, M E ( Matthias Ernst ), Sölch, D ( Dennis ), and Oelkers, Jürgen

Abstract

Karl Popper hat kurz vor seinem Tod eine Sammlung von Essays veröffentlicht, die überschrieben ist mit dem Satz: Alles Leben ist Problemlösen. Das klingt plakativ, aber soll wie ein Programm verstanden werden, das mit Poppers Philosophie eingelöst worden ist. ‚To solve a problem‘ konnte man lange Zeit nur im Hinblick auf mathematische Probleme sagen und nunmehr soll das Leben, biologisch wie sozial, als Kette von Problemlösungen verstanden werden.

Published
2023

17. Correction to: Extracellular Vesicles Derived from Neural Progenitor Cells––a Preclinical Evaluation for Stroke Treatment in Mice

Author

Zheng, X., primary, Zhang, L., additional, Kuang, Y., additional, Venkataramani, V., additional, Jin, F., additional, Hein, K., additional, Zafeiriou, M. P., additional, Lenz, C., additional, Moebius, W., additional, Kilic, E., additional, Hermann, D. M., additional, Weber, M. S., additional, Urlaub, H., additional, Zimmermann, W.-H., additional, Bähr, M., additional, and Doeppner, Thorsten R., additional

Published
2021
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34. Extracellular Vesicles Derived from Neural Progenitor Cells––a Preclinical Evaluation for Stroke Treatment in Mice

Author

Zheng, X., primary, Zhang, L., additional, Kuang, Y., additional, Venkataramani, V., additional, Jin, F., additional, Hein, K., additional, Zafeiriou, M. P., additional, Lenz, C., additional, Moebius, W., additional, Kilic, E., additional, Hermann, D. M., additional, Weber, M. S., additional, Urlaub, H., additional, Zimmermann, W.-H., additional, Bähr, M., additional, and Doeppner, Thorsten R., additional

Published
2020
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38. Quantification of spinal cord compression using T1 mapping in patients with cervical spinal canal stenosis

Author

Maier, I, Hofer, S, Joseph, AA, Merboldt, D, Eggert, E, Behme, D, Schregel, K, von der Brelie, C, Rohde, V, Koch, J, Psychogios, MN, Frahm, J, Liman, J, and Bähr, M

Subjects
ddc: 610, 610 Medical sciences, Medicine
Abstract

Objective: Degenerative changes of the cervical spinal column are the most common cause of spinal cord lesions in the elderly. Conventional clinical, electrophysiological and radiological diagnostics of spinal cord compression are often inconsistent. Methods: The feasibility and diagnostic potential[for full text, please go to the a.m. URL], 70. Jahrestagung der Deutschen Gesellschaft für Neurochirurgie (DGNC), Joint Meeting mit der Skandinavischen Gesellschaft für Neurochirurgie

Published
2019
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39. Quantification of spinal cord compression using T1 mapping in patients with cervical spinal canal stenosis – Preliminary experience

Author

Maier, I., Hofer, S., Joseph, A., Merboldt, K., Eggert, E., Behme, D., Schregel, K., von der Brelie, C., Rohde, V., Koch, J., Psychogios, M., Frahm, J., Liman, J., and Bähr, M.

Subjects
Adult, Male, Cervical spinal canal stenosis, Cervical spondylotic myelopathy, MRI, Spinal cord compression, T1 mapping, T1 relaxometry, Pilot Projects, Middle Aged, lcsh:Computer applications to medicine. Medical informatics, Magnetic Resonance Imaging, Article, lcsh:RC346-429, Spinal Stenosis, Cervical Vertebrae, Humans, lcsh:R858-859.7, Female, Prospective Studies, lcsh:Neurology. Diseases of the nervous system, Aged
Abstract

Background Degenerative changes of the cervical spinal column are the most common cause of spinal cord lesions in the elderly. Conventional clinical, electrophysiological and radiological diagnostics of spinal cord compression are often inconsistent. Materials and methods The feasibility and diagnostic potential of a novel T1 mapping method at 0.5 mm resolution and 4 s acquisition time was evaluated in 14 patients with degenerative cervical spinal canal stenosis (SCS) and 6 healthy controls. T1 mapping was performed in axial sections of the stenosis as well as above and below. All subjects received standard T2-weighted MRI of the cervical spine (including SCS-grading 0-III), electrophysiological and clinical examinations. Results Patients revealed significantly decreased T1 relaxation times of the compressed spinal cord within the SCS (912 ± 53 ms, mean ± standard deviation) in comparison to unaffected segments above (1027 ± 39 ms, p, Highlights • Rapid T1 mapping at 0.5 mm resolution was tested in cervical spinal canal stenosis (SCS). • T1 relaxation times significantly decreased within the SCS. • T1 relaxation times were significantly lower in grade II vs grade I SCS. • Central conduction deficits were inversely correlated with T1 relaxation time. • Rapid T1 mapping robustly and accurately quantifies spinal cord compression.

Published
2019

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