The Shear Strength of Silt (9999)
After the direct shear apparatus had proved itself unsuitable for the investigation of the shear strength of silt, the shear deformation behaviour and the shear parameters were investigated in three...
Investigation of increased drilling speed by online high-speed photography (2008)
Dietrich, J., Brajdic, M., Walther, K., Horn, A., Kelbassa, I., Poprawe, R.
Manufacturing of shaped holes in multi-layer plates by laser drilling (2008)
Walther, K., Brajdic, M., Dietrich, J., Hermans, M., Witty, M., Horn, A., ...
Fusion welding of glass using femtosecond laser pulses with high-repetition rates (2007)
Miyamoto, I., Horn, A., Gottmann, J., Wortmann, D., Yoshino, F.
Multimedia Projekt. Ähnlichkeitsbasierte Ordnung von Lernmodulen (2007)
In order to facilitate the exchange, search, acquisition and use of learning objects it is necessary to describe them on the basis of their metadata. To use them effectively, there is needed a...
Subwavelength ripple formation induced by tightly focused femtosecond laser radiation (2006)
Wagner, R., Gottmann, J., Horn, A., Kreutz, E.W.
Subwavelength ripples (< lambda/4) are obtained by scanning a tightly focused beam (about 1 µm) of femtosecond laser radiation (lambda = 800 nm, t(ind p) = 100 fs) over the surface of either bulk...
CPD: Maternal medication and breastfeeding: Current recommendations. (2005)
A Horn; Senior Specialist And Registered Neonatologist, Division Of Neonatal Medicine, UCT.
Coloured marking inside glass by laser radiation (2005)
Ligbado, G., Horn, A., Kreutz, E.W., Krauss, M.M., Siedow, N., Hensel, H.
Laser labelling inside glass induces micro-cracks by high energy densities in the focus. The micro-cracks reduce the mechanical stability of glass. Light scattering allows the observer to perceive...
Approximate model for laser trepanning with microsecond Nd:YAG laser radiation (2005)
Willach, J., Michel, J., Horn, A., Schulz, W., Kreutz, E.W., Poprawe, R.
Horn, A., Kreutz, E.W., Poprawe, R.
Compared to laser radiation in the nanosecond regime, glass is modified using femtosecond laser radiation without cracking. The modification of the matrix structure of glass (BK7 glass, fused silica...
Cladding, drilling, and shaping of aerospace and power plant components by laser radiation (2004)
Kreutz, E.W., Willach, J., Kelbassa, I., Backes, G., Horn, A., Keutgen, S., ...
Drilling of cooling holes (diameter about 200µm) in a multilayer system (CMSX-4, MCrAlY, zirconia) of turbine blades enabling effusion cooling is performed via melt extraction by pulsed laser...
Approximate model for laser trepanning with microsecond Nd:YAG laser radiation (2004)
Willach, J., Michel, J., Horn, A., Schulz, W., Kreutz, E.W., Poprawe, R.
Trepanning of 200 µm cooling holes in 2 - 4 mm thick CMSX-4 turbine material is done by a lamp-pumped Nd:YAG slab laser with pulse durations of 100 - 500 µs and pulse energies up to 1 J determining...
Lugscheider, E., Bobzin, K., Erdle, A., Horn, A., Pütz, U., Kreutz, E.W., ...
Hier wird die Herstellung eines Mikroaktors auf Basis eines mittels Laser strukturiertem Bimetall-Elementes vorgestellt. Die Bimetallschichten werden als mehrlagiger Schichtverbund mit dem...
Electron excitation in glasses and sapphire followed by time- and space-measuring tools (2004)
Kreutz, E.W., Horn, A., Poprawe, R.
Temporal and spatial changes in the matrix of glasses (BK7 glass, fused silica, quartz) and sapphire are investigated during and after irradiation by pulsed laser radiation (100 fs < t(ind p) < 3 ps)...
Horn, A., Kreutz, E.W., Poprawe, R.
The dynamics of absorption after excitation of fused silica and BK7 glass with femtosecond laser radiation are visualized by transient absorption spectroscopy. Focusing laser radiation with pulse...
Acute pancreatitis in Bergen, Norway. A study on incidence, etiology and severity (2004)
Gislason, H, Horn, A, Hoem, D, Andrén-Sandberg, A, Imsland, A K, Søreide, O, ...
BACKGROUND: Studies on the incidence and etiology of acute pancreatitis show large regional differences. This study was performed to establish incidence, etiology and severity of acute pancreatitis...
Microstructuring of SiC by laser ablation with pulse duration from ns to fs range (LAMP2002) (2003)
Kreutz, E.W., Weichenhain, R., Wagner, R., Horn, A.
The precision machining of silicon carbide (SiC) by short pulse (ns, ps) laser radiation has been investigated at different fluence and wavelength (355 nm, 532 nm, 1064 nm) to determine the...
Willach, J., Horn, A., Kreutz, E.W.
Turbine blades are provided with cooling holes in order to protect them against the heat of the burning process. To avoid hot spots on the cooled blade surface aerodynamic blow-out facilities are...
UV laser radiation-induced modifications and microstructuring of glass (2002)
Talkenberg, M., Kreutz, E.W., Horn, A., Jacquorie, M., Poprawe, R.
Modifications and microstructures are generated on the surface and in the volume of silicate glasses using pulsed UV laser radiation of small pulse length. During the interaction of pulsed excimer...
Willach, J., Horn, A., Kreutz, E.W.
Drilling of cooling holes (diameter 200µm) by melt expulsion with microsecond pulsed laser radiation in a multilayer system (Ni-superalloy CMSX-4, VPS-McrAlY, EB-PVD-zirconia) of turbine blades is...
Dynamics of laser-induced cracking in glasses at a picosecond time scale (2001)
Horn, A., Weichenhain, R., Kreutz, E.W., Poprawe, R.
The interaction of picosecond pulsed laser radiation with BK7 glass has been investigated. Focusing laser pulses with 40 picosecond pulse duration in BK7 glass leads to plasma and crack formation by...
Manufacturing of precise SiC components by Nd:YAG laser radiation (2001)
Kreutz, E.W., Weichenhain, R., Horn, A., Poprawe, R.
Micromachining of SiC with Nd:YAG laser radiation was performed in various processing gas atmospheres as a function of processing variables showing the influence of the heat and pressure load onto...
Schröder, H., Obermeier, E., Horn, A., Wachutka, G.K.M.
In this paper, the mechanism of convex corner (CC) undercutting of Si-{100} in pure aqueous KOH solutions is revisited by proposing the step-flow model of 3-D structuring as a proper description of...
Amyloidogenicity of recombinant human pro-islet amyloid polypeptide (ProIAPP) (2000)
Krampert, M., Bernhagen, J., Schmucker, J., Horn, A., Schmauder, A., Brunner, H., ...
Microholes in zirconia coated Ni-superalloys for transpiration cooling of turbine blades (2000)
Horn, A., Weichenhain, R., Albrecht, S., Kreutz, E.W., Niessen, M., Michel, J., ...
Drillings in zirconia coated Ni-superalloys is done by melt extraction with pulsed laser radiation provided by a Nd:YAG slab laser with microsecond pulse duration. This laser system distinguishes...
Strukturieren mit Laserstrahlung (2000)
Kreutz, E.W., Berden, T., Weichenhain, R., Horn, A., Jacquorie, M.
Das Laserstrukturieren ermöglicht Strukturgenauigkeiten von wenigen mu m bei Strukturgrößen von wenigen mu m bis einigen mm. Als serielles Verfahren zeigt es eine hohe Flexibilität bezüglich der...
Anton Horn, Henning Schroeder, A. Horn, H. Schröder, Ernst Obermeier, Gerhard Wachutka
We present a new model of three-dimensional orientation-dependent etching of Si {100} . Recent experimental results suggest to conceive etching as a "peeling" process of terraced planes,...
Structuring of ceramics and hard metals by short laser pulses (1999)
Weichenhain, R., Horn, A., Kreutz, E.W.
For materials, which are difficult to structure mechanically the application of diode pumped solid state lasers for producing three dimensional microstructures is of great interest. Three dimensional...
Three dimensional microstructures in ceramics by diode pumped solid state lasers (1999)
Weichenhain, R., Horn, A., Jandeleit, J., Kreutz, E.W.
The application of diode pumped solid state laser radiation for producing three dimensional microstructures is of great interest to materials, which are difficult to structure by conventional...
Three dimensional microstructures in ceramics by diode pumped solid state lasers (1998)
Weichenhain, R., Horn, A., Jandeleit, J., Kreutz, E.W.
The application of diode pumped solid state laser radiation for producing three dimensional microstructures is of great interest to materials, which are difficult to structure by conventional...
Fundamental investigations of micromachining by nano- and picosecond laser radiation (1998)
Jandeleit, J., Horn, A., Weichenhain, R., Kreutz, E.W., Poprawe, R.
The removal processes of ceramics and metals were investigated using pico- and nanosecond laser radiation produced by diode-pumped Nd:YAG lasers. The laser radiation was focused to spot diameters...
Control of high power active filter for DC traction substation / (1996)
Thesis (M. Ing.)--University of Stellenbosch, 1996.
Effect of arm position on the effectiveness of perivascular axillary nerve block (1995)
KOSCIELNIAK-NIELSEN, Z. J., HORN, A., NIELSEN, P. ROTBØLL
The influence of arm position on the effectiveness of perivascular axillary nerve block with a catheter was assessed prospectively in two groups of patients. Ninety patients were allocated randomly...
Community based program to improve firearm storage practices in rural Alaska
Horn, A, Grossman, D, Jones, W, Berger, L
Objective: To develop and evaluate a pilot program to reduce unauthorized access to firearms by youth by distributing gun safes and trigger locks to households.