Vorrichtung zum Schweissen mit Ultraschall (2007)
Dobmann, G., Paul, M., Eifler, D., Fassbender, S., Fassbender, G.
40Ca(alpha,gamma)44Ti Reaction in the Energy Regime of Supernova Nucleosynthesis (2006)
Nassar, H., Paul, M., Ahmad, I., Ben-Dov, Y., Caggiano, J., Ghelberg, S., ...
The 44Ti(t1/2=59 yr) nuclide, an important signature of supernova nucleosynthesis, has recently been observed as live radioactivity by gamma-ray astronomy from the Cas A remnant. We investigate in...
40Ca(alpha,gamma)44Ti Reaction in the Energy Regime of Supernova Nucleosynthesis (2006)
Nassar, H., Paul, M., Ahmad, I., Ben-Dov, Y., Caggiano, J., Ghelberg, S., ...
The 44Ti(t1/2=59 yr) nuclide, an important signature of supernova nucleosynthesis, has recently been observed as live radioactivity by gamma-ray astronomy from the Cas A remnant. We investigate in...
The 40Ca(alpha,gamma)44Ti reaction in the energy regime of supernova nucleosynthesis (2005)
Nassar, H., Paul, M., Ahmad, I., Ben-Dov, Y., Caggiano, J., Ghelberg, S., ...
The 44Ti(t1/2 = 59 y) nuclide, an important signature of supernova nucleosynthesis, has recently been observed as live radioactivity by gamma-ray astronomy from the Cas A remnant. We investigate in...
Kolbe, A., Tiessen, A., Schluepmann, H., Paul, M., Ulrich, S., Geigenberger, P.
Trehalose is the most widespread disaccharide in nature, occurring in bacteria, fungi, insects, and plants. Its precursor, trehalose 6-phosphate (T6P), is also indispensable for the regulation of...
Duration of antibacterial treatment for uncomplicated urinary tract infection in women (2005)
Milo, G, Katchman, E, Paul, M, Christiaens, T, Baerheim, A, Leibovici, L
Background Uncomplicated urinary tract infection ( UTI) is a common disease, occurring frequently in young sexually active women. In the past, seven day antibiotic therapy was recommended while the...
Hindrance of Heavy-ion Fusion at Extreme Sub-Barrier Energies in Open-shell Colliding Systems (2004)
Jiang, C. L., Rehm, K. E., Esbensen, H., Janssens, R. V. F., Back, B. B., Collon, P., ...
The excitation function for the fusion-evaporation reaction 64Ni+100Mo has been measured down to a cross-section of ~5 nb. Extensive coupled-channels calculations have been performed, which cannot...
The stellar (n,gamma) cross section of 62Ni (2004)
Nassar, H., Paul, M., Ahmad, I., Berkovits, D., Bettan, M., Collon, P., ...
The 62Ni(n,gamma)63Ni(t_1/2=100+-2 yrs) reaction plays an important role in the control of the flow path of the slow neutron-capture (s-) nucleosynthesis process. We have measured for the first time...
Influence of nuclear structure on sub-barrier hindrance in Ni+Ni fusion (2004)
Jiang, C. L., Rehm, K. E., Janssens, R. V. F., Esbensen, H., Ahmad, I., Back, B. B., ...
Fusion-evaporation cross sections for $^{64}$Ni+$^{64}$Ni have been measured down to the 10 nb level. For fusion between two open-shell nuclei, this is the first observation of a maximum in the...
Genetic modification of photosynthesis with E. coli genes for trehalose synthesis (2004)
Pellny, T., Ghannoum, O., Conroy, J.P., Schlupmann, H., Smeekens, J.C.M., Andralojc, J., ...
Einfluss der Außenwandkonstruktion auf nächtliche Betauung und mikrobiellen Bewuchs (2004)
Sedlbauer, K., Krus, M., Lenz, K., Paul, M.
Bei WDVS-Konstruktionen ist die Speicherfähigkeit des außenseitigen Oberflächenbereichs geringer als bei einer monolithischen Wand mit demselben U-Wert. Dies führt zu einer geringeren...
Einfluss der Außenwandkonstruktion auf nächtliche Betauung und mikrobiellen Bewuchs (2004)
Sedlbauer, K., Krus, M., Lenz, K., Paul, M.
Bei WDVS-Konstruktionen ist die Speicherfähigkeit des außenseitigen Oberflächenbereichs geringer als bei einer monolithischen Wand mit demselben U-Wert. Dies führt zu einer geringeren...
Solecki, R., Bergmann, B., Burgin, H., Buschmann, J., Clark, R., Druga, A., ...
This article is a report on the Fourth Berlin Workshop on Terminology in Developmental Toxicology, which was held in April 2002. The workshop is part of an international project in the field of...
Grimm, D., Bauer, J., Kossmehl, P., Shakibaei, M., Schonberger, J., Pickenhahn, H., ...
This study focuses on the effects of simulated microgravity (0g) on the human follicular thyroid carcinoma cell line ML-1. Cultured on a three-dimensional clinostat, ML-1 cells formed...
Experimental Limit to Interstellar 244Pu Abundance (2001)
Paul, M., Valenta, A., Ahmad, I., Berkovits, D., Bordeanu, C., Ghelberg, S., ...
Short-lived nuclides, now extinct in the solar system, are expected to be present in the interstellar medium (ISM). Grains of ISM origin were recently discovered in the inner solar system and at...
Vita.
Persistent photocurrents in CVD diamond (2000)
Nebel, C.E., Waltenspiel, A., Stutzmann, M., Paul, M., Schäfer, L.
Persistent photocurrents (PPCs) in undoped polycrystalline CVD diamond are generated by UV illumination with 5.5 eV photons. PPCs are several orders of magnitude larger than dark currents and can be...
Detection of Laser Excited Surface Acoustic Waves by Infrared Radiation (2000)
Arnold, W., Paul, M., Kubyshkin, A.
Remote detection of ultrasonic waves is shown experimentally by measuring the infrared (IR) radation accompanying the adiabatic propagation of surface waves. The Rayleigh waves were excited by a...
In situ boron doping of chemical-vapor-deposited diamond films (1999)
Jiang, X., Willich, P., Paul, M.
A systematic investigation of the boron doping of microwave-plasma-deposited diamond films was performed. Doping with levels up to 550 ppm was carried out in situ on undoped diamond film substrates...
Neural Network For The Behavioral Navigation Of A Mobile Robot (1998)
. This paper describes a neural network model for the reactive navigation of a mobile robot. The system defines a series of reactive behaviors: stop, avoid, stroll, wall following, etc. depending on...
Laser Ultrasonics in Industry (1998)
Paul, M., Hoffmann, A., Oesterlein, L.
The generation of ultrasound by pulsed lasers and its interferometric detection, shortly called laser ultrasonics, is a well established ndt method in research laboratories. However, until now the...
Development of diamond films for particle detector applications (1998)
Behnke, T., Oh, A., Wagner, A., Zeuner, W., Bluhm, A., ...
The material properties of chemical vapour deposited (CVD) diamond such as its high resistance against radiation make diamonds an attractive material for development of particle detectors. For such...
Development of chemical vapour deposited diamond films for particle detector applications (1998)
Schäfer, L., Bluhm, A., Paul, M., Oh, A., Wagner, A., Zeuner, W.
The high resistance against defect generation by particle bombardment favours diamond over other materials for particle detector applications, especially in the light of increased particle flux...
Prüfung von Klebverbindungen mit Thermographie und thermischen Wellen (1997)
Meyendorf, N., Fassbender, S., Netzelmann, U., Paul, M., Walle, G., Vetterlein, T.
Nondestructive testing by means of thermal methods is based on detection of different thermophysical material properties. Defects in bonded structures are a barrier to thermal diffusion. Thus, these...
A light-in-light-out ultrasonic measurement system (1997)
A new designed Michelson heterodyne interferometer is assembled to a Light-In-Light-Out ultrasonic measurement system. This means that a pulsed laser is used in order to generate ultrasound in a...
Ion-bombardment-induced heteroepitaxy and texture in diamond films (1997)
Jiang, X., Paul, M., Xia, Y.B., Zhang, W.J.
Heteroepitaxial nucleation of diamond from the gas phase can be achieved on silicon substrates and on single-crystalline cubic silicon carbide (3C-SiC) wafers by applying a negative substrate bias...
Characterization of creep and fatigue damage using laser generated ultrasound (1996)
Kalyanasundaram, P., Paul, M., Raj, B., Arnold, W.
The absorption coefficient of laser generated ultrasound was evaluated for different frequencies to characterize creep and fatigue damages in low alloy ferritic steels. It was found to increase...
Laserultraschall-Materialcharakterisierung im Höchsttemperaturbereich (1996)
Paul, M., Haberer, B., Hoffmann, A.
The paper describes an experimental method for ultrasonic material characterization at temperatures up to 2000 Kelvin. As ultrasonic source a pulsed laser is used exciting different ultrasonic moeds....
Paul, M., Haberer, B., Spies, M., Arnold, W., Hoffmann, A.
High-temperature resistant light-weight materials for construction are in the focus of world-wide research. We report on the determination of elastic wave velocities in carbon-reinforced carbon...
Absorption measurements on creep damaged samples using the reverberation technique (1996)
Paul, M., Reszat, J., Kalyanasundaram, P.
Ultasonic absorption measurements have been performed on creep damaged samples using the reverberation technique by laser ultrasonics. The materials investigated were low alloy ferritic steels widely...
Studies of heteroepitaxial nucleation and growth of diamond on silicon (1995)
Jiang, X., Paul, M., Jia, C.L.
The decisive role of ion bombardment, due to the substrate bias for epitaxial diamond nucleation by microwave plasma chemical vapor deposition (MWCVD), was demonstrated by growth experiments using...
Erzeugung und Nachweis von Ultraschall mit optischen Methoden (1995)
An overview is given about laser ultrasonics and its applications. For the effective excitation of ultrasound a proper choice of the pulse laser's wavelength and energy with respect to the...
Brand, U., Mengedoht, K., Pessel, M., Paul, M., Trier, H.
The aim of the experiments is the development of a non-invasive technique for determining the location of an ultrasonic focus in the wall of the human eye. This would enable improvements in...
Eine Vorrichtung zum beruehrungslosen Erfassen der durch Ultraschallwellen verursachten Oberflaechenauslenkung eines Prueflings verfuegt ueber einen Laser (1) zur Erzeugung eines Lichtflecks (6) auf...
Neumann, M., Hoetzsch, G., Morgner, H., Paul, M., Weiland, H.
The aluminium foil is intended to have a high specific surface capacitance at high stability. The manufacture is intended to be environmentally friendly and performed using conventional coating...
Haberer, B., Arnold, W., Willems, H., Paul, M.
A new technique is presented allowing one to measure ultrasonic absorption in a wide temperature range in polycrystalline materials and even in single crystals, by generating reverberation fields by...
Haberer, B., Paul, M., Willems, H., Arnold, W.
A new method is presented for contact free measurement of ultrasonic absorption in polycrystalline materials.Short laser pulses are used for the generation of ultrasonic pulses, and an optical...
Flaw characterization by thermography and shearography (1994)
Paul, M., Burgschweiger, J., Walle, G., Meyendorf, N., Vikhagen, E.
The results of a study comparing the techniques of thermography and shearography are presented. Disk shaped samples made of PVC have been irradiated by a high energy light pulse. Surface temparature...
Materials characterization at high temperatures using laser ultrasound (1993)
Paul, M., Arnold, W., Haberer, B.
By short laser pulses (pulse duration: 1-100 ns and pulse energy: 1-500 mJ, typically) ultrasonic signals are generated in a contact free way and detected by an optical interferometer. From the...
A system is presented which is based on optical generation and detection of ultrasound for non-contact measurement of grain sizes in metal sheets with thickness less than 1mm. A broadband ultrasonic...
Haas, F., Schätzle, P., Knobel, R.M., Eyer, A., Paul, M.
An ultrasonic system is suited to detect the solid/liquid interface in a directional solidification process of silicon. Such processes are used to produce large multicrystalline ingots from which...
Messung der elastischen Eigenschaften bei Mikrobruchvorgängen in Aluminiumoxid Keramiken (1990)
Arnold, W., Paul, M., Quinten, A.
Bei einigen wichtigen technischen Keramiken beobachtet man den sogenannten R-Kurven-Effekt. Dieser beschreibt das Ansteigen des Rißwiderstandes R mit zunehmender Rißlänge. Um diesen zusätzlichen...
Experimented study of laser-generated shear waves using interferometry (1990)
Zhang, S.Y., Schleichert, U., Arnold, W., Fassbender, S., Paul, M.
The shear displacements generated by short laser pulses have been measured in aluminum semicylindrical samples, both in the thermoelastic and ablation regimes. We measured the waveforms at different...
Anregung von Ultraschall (1990)
Arnold, W., Fassbender, S., Paul, M.
Eines der wichtigsten Werkzeuge der zerstörungsfreien Prüfung ist die Ultraschalltechnik. Mit Laserpulsen hoher Energie besteht nun die Möglichkeit, Ultraschallwellen über größere Entfernungen...
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Non-contact and nondestructive evaluation of grain-size in thin metal sheets (1989)
Kalukov, M., Arnold, W., Faßbender, S., Hoffmann, B., Paul, M., Peukert, H.
It is desirable to measure the grain-size in a production-line for thin metal-sheets such as cold-rolled sheets in a non-contact way. This enables one to control the production parameters by means of...
Eine neue Methode der Laufzeitinterferometrie zum Nachweis von Ultraschall (1989)
Berührungslose Methoden zur Erzeugung und zum Nachweis von Ultraschallimpulsen finden in der zerstörungsfreien Prüfung zunehmend an Bedeutung, da Koppelsysteme weitgehend vermieden werden und das...
Grain-size measurements in thin metal sheets by laser-generated ultrasound (1989)
Arnold, W., Paul, M., Peukert, H.
We use short laser pulses to generate broadband ultrasonic pulses in polycrystalline materials and interferiometric techniques to detect the ultrasonic signals. The damping of the spectral components...
Verfahren zum beruehrungslosen Erfassen von Ultraschallwellen eines Prueflings (1988)
Arnold, W., Betz, B., Paul, M.
Bei einem Verfahren zum Nachweis von Ultraschall an rauhen Oberflaechen mit Hilfe der optischen Interferometrie wird zur Wiederherstellung der urspruenglichen Strahlqualitaet ein phasenkonjugierender...
Schleichert, U., Arnold, W., Hoffmann, B., Paul, M.
Broadband ultrasonic pulses can be remotely generated by short laser pulses at solid surfaces via the thermoelastic effect and by ablation of surface material. Such a technique might be a viable tool...
Interferometric detection of ultrasound at rough surfaces using optical phase conjugation (1988)
Betz, B., Arnold, W., Paul, M.
Optical detection of ultrasonic signals of 7.5 MHz center frequency has been carried out by heterodyne-interferometry at the rough surface of an aluminum sample. The distorted wave-front was...