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558 results on '"Bohne W"'

1. Nanogranular MgB2 thin films on SiC buffered Si substrates prepared by in-situ method

Author

Chromik, S., Huran, J., Strbik, V., Spankova, M., Vavra, I., Bohne, W., Rohrich, J., Strub, E., Kovac, P., and Stancek, S.

Subjects
Condensed Matter - Superconductivity, Condensed Matter - Materials Science
Abstract

MgB2 thin films were deposited on SiC buffered Si substrates by sequential electron beam evaporation of B-Mg bilayer followed by in-situ annealing. The application of a SiC buffer layer enables the maximum annealing temperature of 830 C. The Transmission Electron Microscopy analysis confirms the growth of a nanogranular MgB2 film and the presence of a Mg2Si compound at the surface of the film. The 150-200 nm thick films show a maximum zero resistance critical temperature TC0 above 37 K and a critical current density JC ~ 106 A/cm2 at 11K., Comment: 7 pages, 6 figures, submitted to Applied Physics Letters

Published
2005
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4. Bradyzoite-Specific Genes

Author

Bohne, W., Parmley, S. F., Yang, S., Gross, U., Compans, R. W., editor, Cooper, M., editor, Koprowski, H., editor, Melchers, F., editor, Oldstone, M., editor, Olsnes, S., editor, Potter, M., editor, Saedler, H., editor, Vogt, P. K., editor, Wagner, H., editor, and Gross, Uwe, editor

Published
1996
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5. CuGa xSe y chalcopyrite-related thin films grown by chemical close-spaced vapor transport (CCSVT) for photovoltaic application: Surface- and bulk material properties, oxidation and surface Ge-doping

Author

Rusu, M., Wiesner, S., Würz, R., Lehmann, S., Doka-Yamigno, S., Meeder, A., Fuertes Marrón, D., Bär, M., Koteski, V., Mahnke, H.-E., Arushanov, E., Beckmann, J., Höhn, K., Fritsch, W., Bohne, W., Schubert-Bischoff, P., Heuken, M., Jäger-Waldau, A., Rumberg, A., and Schedel-Niedrig, Th.

Published
2011
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9. Etude structurale, ultrastructurale et microanalyse de perles d’émail multiples

Author

Bohne, W, Pouëzat, J.A., and Kerebel, B

Subjects
stomatognathic diseases, stomatognathic system, natural sciences, eye diseases
Abstract

Numerous enamel drops and compound enamel pearls were found on the radicular proximal faces of maxillary molars and mandibular third molars of a young woman. Enamel and dentin of compound pearls as well as cementum next to drops and pearls presented the same structure and ultrastructure as enamel, dentin and cementum of the corresponding teeth. Microanalysis did not reveal differences between enamel of the mother tooth and enamel of drops and pearls. The enamel drops had no incremental growth lines.Cementum next to enamel drops and compound enamel pearls was acellular and covered occasionally with a thick layer of cellular cementum. Only enamel drops were partially covered by acellular cementum.Close to the enamel drops and at their surface, numerous fusing globular calcifications were observed.Formation of enamel drops and compound enamel pearls on dental root surfaces is rare. The simultaneous presence of numerous enamel drops and some compound enamel pearls on several roots of molars in the same denture seems to be an exceptionnal phenomenon. The involved factors inducing enamel formation remain still unknown. The multitude of both enamel drops and compound enamel pearl might be due to constitutionnal prédisposition., De nombreuses perles d’émail simples et composées, localisées sur les faces proximales des racines des molaires maxillaires et des dents de sagesse mandibulaires d’une même personne ont été étudiées en microscopie classique, microscopie électronique à balayage et microanalyse. L’émail et la dentine des perles composées ainsi que le cément jouxtant les perles ont la même structure et ultrastructure que l’émail, la dentine et le cément des dents porteuses, la microanalyse ne montre pas de différences entre l’émail des perles et l’émail des dents. Les perles d’émail simples ne possèdent pas de lignes de croissance. Le cément, à proximité des perles d’émail simples et composées, est de type acellulaire, doublé d’une couche, parfois épaisse, de cément cellulaire. Seules, les perles d’émail simples sont recouvertes partiellement par du cément acellulaire. On observe de nombreux calcoglobules à la surface et à proximité des perles d’émail simples.La sécrétion d’émail radiculaire sous la forme de perles simples ou composées est un phénomène rare. L’observation simultanée, dans une même denture, de nombreuses perles simples et composées constitue un fait nouveau et semble exceptionnel.Le ou les facteurs déclenchant un tel processus n’ont pu être déterminés jusqu’à présent. Une prédisposition constitutionnelle, dont la preuve reste à apporter, pourrait en être responsable.

Published
2020

16. The configuration of Cu centers in electroluminescent SrS:Cu phosphors: an x-ray absorption fine structure and optical study

Author

Wruck, D., Huttl, B., Boyn, R., Bohne, W., Wienecke, M., Reinhold, B., Henneberger, F., Mahnke, H.-E., and Troppenz, U.

Subjects
Sulfur -- Optical properties, Strontium -- Optical properties, Copper -- Optical properties, Physics
Abstract

Dependence of photoluminescence (PL) spectra on temperature and Cu concentration on the basis of center reaction was explained. This has given information on the excitation efficiencies of the centers.

Published
2002

24. A round robin characterisation of the thickness and composition of thin to ultra-thin AlNO films

Author

Barradas, N.P., Added, N., Arnoldbik, W.M., Bogdanović-Radović, I., Bohne, W., Cardoso, S., Danner, C., Dytlewski, N., Freitas, P.P., Jakšić, M., Jeynes, C., Krug, C., Lennard, W.N., Lindner, S., Linsmeier, Ch., Medunić, Z., Pelicon, P., Pezzi, R.P., Radtke, C., Röhrich, J., Sajavaara, T., Salgado, T.D.M., Stedile, F.C., Tabacniks, M.H., and Vickridge, I.

Published
2005
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30. Limitations of the pulse-shape technique for particle discrimination in planar Si detectors

Author

Pausch, G., Moszynski, M., Bohne, W., Cederkall, J., Grawe, H., Klamra, W., Lampert, M.-O., Rohr, P., Schubart, R., Seidel, W., and Wolski, d.

Subjects
Pulse techniques (Electronics) -- Evaluation, Silicon diodes -- Analysis, Business, Electronics, Electronics and electrical industries
Abstract

Limitations of the pulse-shape discrimination (PSD) technique - a promising method to identify the charged particles stopped in planar Si-detectors - have been investigated. The particle resolution turned out to be basically determined by resistivity fluctuations in the bulk silicon which cause the charge-collection time to depend on the point of impact. Detector maps showing these fluctuations have been measured and are discussed. Furthermore we present a simple method to test the performance of detectors with respect to PSD. Another limitation of the PSD technique is the finite energy threshold for particle identification. This threshold is caused by an unexpected decrease of the total charge-collection time for ions with a short range, in spite of the fact that the particle tracks are located in a region of very low electric field.

Published
1997

34. Identification of light charged particles and heavy ions in silicon detectors by means of pulse-shape discrimination

Author

Pausch, G., Ortlepp, H.-G., Bohne, W., Grawe, H., Hilscher, D., Moszynski, M., Wolski, D., Schubart, R., Angelis, G. de, and Poli, M. de

Subjects
Particles -- Identification and classification, Heavy ions -- Identification and classification, Silicon diodes -- Research, Business, Electronics, Electronics and electrical industries
Abstract

Pulse-shape discrimination with totally depleted Si-detectors in reverse mount has been investigated and shown to be an excellent method of charged-particle identification in the energy range of [approximately equal to] 2 to 20 AMeV. In test experiments with heavy-ion beams we obtained element identification up to Ti and isotope resolution even for elements heavier than carbon. The promising results and the simplicity of the electronics recommend this technique for applications in multidetector arrays. In particular, small and compact 4[Pi] Si balls with relatively low thresholds for charged-particle identification to be combined with 4[Pi] neutron detectors or [Gamma] arrays can be constructed.

Published
1996

35. An OS9-UNIX data acquisition system with ECL readout

Author

Ziem, P., Beschorner, C., Bohne, W., Drescher, B., Friese, Th., Kiehne, T., and Kluge, Ch.

Subjects
Automatic data collection systems -- Design and construction, Data communications -- Design and construction, Particle accelerators -- Equipment and supplies, Nuclear physics -- Information management, Business, Electronics, Electronics and electrical industries
Abstract

A new data acquisition system has been developed at the Hahn-Meitner-Institut to handle almost 550 parameters of nuclear physics experiments. The system combines a UNIX host running a portable data buffer router [1] and a VME frontend based on the OS9 real time operating system. Different kinds of pulse analyzers are located in several CAMAC crates which are controlled by the VME system via a VICbus connection. Data readout is performed by means of an ECL daisy chain. Besides controlling CAMAC the main purpose of the VME front-end is event data formatting and histogramming. Using TCP/IP services, the UNIX host receives formatted data packages for data storage and display. During a beam time at the antiproton accelerator LEAR/CERN, the PS208 experiment has accumulated about 100 Gbyte of event data [2].

Published
1996

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