Numerical simulation of the internal plasma dynamics of post-flare loops (2009)
Fernandez, C. A., Costa, A., Elaskar, S., Schulz, W.
We integrate the MHD ideal equations of a slender flux tube to simulate the internal plasma dynamics of coronal post-flare loops. We study the onset and evolution of the internal plasma instability...
Link between Lightning Activity and Temperature: A Regional Study in Switzerland (2008)
Manoochehrnia, P., Price, C., Rachidi, F., Rubinstein, M., Schulz, W.
A Regional Study on the Link between Lightning Activity and Temperature (2008)
Manoochehrnia, P., Price, C., Rachidi, F., Rubinstein, M., Schulz, W.
High speed high precision ablation from ms to fs (2008)
Poprawe, R., Gillner, A., Hoffmann, D., Gottmann, J., Wawers, W., Schulz, W.
Weld depth control in fiber laser welding of thin metal sheets (2008)
Gedicke, J., Olowinsky, A., Jansen, U., Schulz, W., Gillner, A.
Verfahren zum Schneiden von zu fuegenden Bauteilen mit Laserstrahlung (2007)
Schulz, W., Michel, J., Abels, P., Alber, G., Neubert, J., Behr, F., ...
WO 200272304 A UPAB: 20021022 NOVELTY - The cutting method has a computer-controlled handling system for the laser cutting beam, for guiding it along a defined cutting path corresponding to a curved...
Diagnosis and simulation of high speed drilling (2007)
Schulz, W., Trippe, L., Eppelt, U.
Laser drilling is a thermal ablation process being about to be widely applied in ablating and hole drilling applications, such as the drilling of filters, sieves or injection nozzles. This work...
Verfahren zur Materialabtragung sowie Vorrichtung zur Durchfuehrung des Verfahrens (2007)
Schulz, W., Petring, D., Schneider, F., Niessen, M.
DE 102007024701 A1 UPAB: 20081212 NOVELTY - The method for material ablation over a desired erosion depth of a work piece by a laser beam having partial beams, which have a defined beam axis,...
Measuring and assessing empirical media diversity: Some European cases (2007)
Aslama, M., Cuilenburg, J.J. Van, Kovats, I., Mazzoleni, G., Negrine, R., ...
Petring, D., Schneider, F., Schulz, W., Niessen, M.
DE 102007024700 A1 UPAB: 20081217 NOVELTY - Focusing is effected to form a beam waist. Fractions of the beam (7) are deflected to diverge from the axis (4) at, ahead of and/or after the beam waist,...
Verfahren zum Fuegen von mindestens zwei Bauteilen mittels Laserstrahlung (2007)
Schulz, W., Olowinsky, A., Gedicke, J.
WO 2009021716 A1 UPAB: 20090311 NOVELTY - The method for joining two components of homogeneous and inhomogeneous metallic materials (100, 101) by laser radiation, comprises forming a welding seam...
Verfahren zum Trennen von Werkstoffen mit einem Laserstrahl (2006)
Schulz, W., Poprawe, R., Kaierle, S., Petring, D.
WO2006045431 A UPAB: 20060526 NOVELTY - The method involves emerging a laser beam (2) from a cutting head (3) comprising a cutting nozzle with an inner edge (4). The axis of the beam is displaced in...
Regaard, B., Moalem, A., Michel, J., Abels, P., Kaierle, S., Schulz, W.
WO 2006094488 A1 UPAB: 20061121 NOVELTY - A method for setting out the phase limits/boundaries of a workpiece requires, during processing, a processing zone (13) comprising an incidence hit location...
Regaard, B., Kaierle, S., Schulz, W., Moalem, A.
Due to high demands on quality assurance and the necessity of permanent documentation of product quality forced by ISO 9000 and in-house regulations, the need for reliable online process control...
Die Zukunft des deutschen Kabelfernsehnetzes: Sechs Schritte zur Digitalisierung (2005)
Beckert, B., Schulz, W., Zoche, P., Dreier, H.
Das deutsche Kabelfernsehnetz ist mit 22 Mio. angeschlossenen Haushalten das zweitgrößte nach den USA. Mit seiner hohen Kapazität könnte es nicht nur Hunderte digitaler TV-Programme übertragen,...
Schulz, W., Willach, J., Petereit, J., Trippe, L., Kreutz, E.W.
WO2005092560 A UPAB: 20051027 NOVELTY - The normal borehole radius (r B) is greater than the normal radius of the laser beam. The laser beam intensity (Intensitat) may be given a profile which falls...
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.
Modelling and dynamical simulation of laser beam welding (2004)
Schulz, W., Michel, J., Eppelt, U., Maier, C.
Laser beam welding is a thermal joining process widely used in welding of tailored blanks and contour welding applications. However, there are gaps in understanding the dynamics of the process,...
Trippe, L., Willach, J., Petereit, J., Kreutz, E.W., Schulz, W., Poprawe, R.
Single pulse drilling of micro holes (diameter 100 µm, depth < 2 mm) in stainless steel (X5CrNi18-10) and nickel-base superalloy (CMSX-4) is performed by pulsed Nd:YAG laser radiation (pulse...
Trippe, L., Willach, J., Kreutz, E.W., Schulz, W., Petereit, J., Kaierle, S., ...
Single pulse drilling and percussion drilling of micro holes (diameter 100 µm, depth 2 mm) with Nd:YAG laser radiation (pulse duration 100 - 500 µs) in stainless steel (X5CrNi18-10) and...
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...
Approximate model for laser welding (2004)
Michel, J., Pfeiffer, S., Schulz, W., Nießen, M., Kostrykin, V.
The industrial application of laser welding implies a reliable and efficient production process. In order to facilitate this, modeling and simulation is used to reveal the crucial points of the...
Short-time dynamics in laser material processing (2004)
Kostrykin, V., Schulz, W., Nießen, M., Michel, J.
Material processings with laser radiation as cutting, welding, and drilling are established industrial processes. Their main advantages compared to conventional methods are the flexibility,...
Modeling and simulation of process monitoring and control in laser cutting (2004)
Schulz, W., Kostrykin, V., Michel, J., Niessen, M.
Laser cutting at moderate conditions is well established in industries. Both, high cutting speed for efficient machining and low cutting speed during contour cutting change the dynamical properties...
Laser machining by short and ultrashort pulses, state of the art (2003)
Meijer, J., Du, K., Hoffmann, D., Kovalenko, V.S., Ostendorf, A., Poprawe, R., ...
Identification of dimension in phase space for cutting (2003)
Schulz, W., Eppelt, U., Heesen, H., Kostrykin, V., Michel, J., Niessen, M.
Laser cutting is an established separation process. Reliable machining at high productivity and quality as well as simplified machine operation are the actual goals in industries. This work describes...
Development and application of new high-power laser beam sources (2003)
The actual market volume of high-power lasers for manufacturing is dominated by diffusion cooled CO2 laser systems at the multi-kW range and lamp pumped Nd:YAG laser systems at the kW range....
Treatment of materials with high energy radiation inducing a plasma, in particular, laser radiation (12) is claimed. The region of vapour capillaries of the workpiece (10) is observed with a depth of...
Approximate model for laser welding (2003)
Michel, J., Pfeiffer, S., Schulz, W., Nießen, M., Kostrykin, V., Maier, C.
The industrial application of laser welding implies a reliable and efficient production process. Thus, modelling and simulation is used to reveal the crucial points of the welding process. The...
Willach, J., Kreutz, E.W., Michel, J., Nießen, M., Schulz, W., Poprawe, R.
Trepanning of 200µm holes in 2-5mm thick CMSX-4 sheets is done by laser radiation provided by a lamp-pumped Nd:YAG slab laser with pulse durations of 100-500µs. Pulse energies
Meijer, J., Du, K., Gillner, A., Hoffmann, D., Kovalenko, V.S., Masuzawa, T., ...
An overview is given of the applications of short and ultrashort lasers in material processing. Shorter pulses reduce heat-affected damage of the material and opens new ways for nanometer accuracy....
Neuffer, H., Pfaffenberger, W., Gregorzewski, A., Schulz, W., Blesl, Markus, ...
Die im vorliegenden Band 1 vorgestellten Ergebnisse sollen der Begleitung der anstehenden KWK-Gesetzgebung in technischer und wirtschaftlicher Hinsicht dienen. Das derzeitige KWK-(Vorschalt-)Gesetz,...
Neuffer, H., Pfaffenberger, W., Gregorzewski, A., Schulz, W., Blesl, Markus, ...
Zweiter Band der AGFW-Hauptstudie mit dem Kurztitel "Pluralistische Wärmeversorgung". Teil 1 "Wärmeversorgung des Gebäudebestandes" gliedert sich in den Hauptabschnitt A "Ökologischer und...
Quality assurance in laser-beam welding of heavy section steel sheet (2001)
Dahmen, M., Kaierle, S., Kapper, G., Michel, J., Schulz, W., Spielvogel, K., ...
New advances in process control for laser materials processing (2001)
Kratzsch, C., Abels, P., Kaierle, S., Poprawe, R., Schulz, W.
Laser beam materials processing requires both, high quality output as well as reliable monitoring actions for each processed part. The process diagnostic device commonly used in actual quality...
New advances in process control for automotive laser applications (2001)
Kaierle, S., Abels, P., Kratzsch, C., Michel, J., Schulz, W., Poprawe, R.
By means of ISO 9000 and other by law enforced rules the manufacturing industry is forced to document and control the quality of their products. With the aim to improve the quality of the...
State of the art and new advances in process control for laser materials processing (2001)
Kaierle, S., Abels, P., Kapper, G., Kratzsch, C., Michel, J., Schulz, W., ...
In laser beam materials processing, the high demands on the quality of the produced parts can only be guaranteed by a continuous supervision of the manufacturing process and by control of specific...
Modelling, dynamical simulation and online monitoring in laser beam welding (2001)
Schulz, W., Michel, J., Niessen, M., Kostrykin, V., Abels, P., Kaierle, S.
Efficient and high quality processing requires identification of the underlying phenomena and on-line monitoring of the achieved performance. The reliability for prediction of the weld quality can be...
Coaxial process monitoring in heavy section laser beam welding (2001)
Kapper, G., Dahmen, M., Kaierle, S., Michel, J., Schulz, W., Spielvogel, K., ...
Besch, H., Neuffer, H., Schönberg, I., Jochem, E., Radgen, P., ...
Die Zusammenfassung dient zwei Zielen: Zunächst werden die wesentlichen Ergebnisse der Langfassung der o.g. Studie referiert; auf dieser Basis werden dann mögliche Maßnahmen und Strategien...
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...
Online process control for laser beam materials processing (2000)
Kratsch, C., Abels, P., Kaierle, S., Poprawe, R., Schulz, W.
Laser beam materials processing requires both, high quality output as well as reliable monitoring actions for each processed part. The process diagnostic device commonly used in actual quality...
Manufacturing with Novel High Power Diode Lasers (2000)
Direct applications of High Power Diode Lasers (HPDLs) like hardening, heat conduction welding of metals and joining of polymers have already been demonstrated also in the industrial environment....
Coaxial process control during laser beam welding of tailored blanks (2000)
Kratzsch, C., Abels, P., Kaierle, S., Poprawe, R., Schulz, W.
Production of laser beam welded tailored blanks requires both, high quality processing as well as a quality assurance by reliable monitoring systems for each welded part. Actual quality monitoring...
Theoretical description of the dynamic phenomena in laser welding with deep penetration (1999)
Lopota, V., Turichin, G., Tzibulsky, I., Valdaytzeva, E., Kreutz, E.W., Schulz, W.
In this article the dynamic model of the process of the laser welding with deep penetration based on the variation principles is presented. The model takes into account melting flow, wave motion on...
Universal coaxial process control system for laser materials processing (1999)
Abels, P., Kratsch, C., Schulz, W., Kaierle, S., Poprawe, R.
Dynamics of ripple formation and melt flow in laser beam cutting (1999)
Schulz, W., Kostrykin, V., Niessen, M., Michel, J., Petring, D., Kreutz, E.W., ...
The dynamical behaviour of the laser beam fusion cutting process of metals is investigated. Integral methods such as the variational formulation are applied to the partial differential equations for...
Verfahren und Vorrichtung zum Materialbearbeiten mit Plasma induzierender Laserstrahlung (1998)
Beyer, E., Beersiek, J., Schulz, W., Nitsch, H.
The invention relates to a process for material processing by means of plasma-inducing high-energy radiation, in particular laser radiation, whereby radiation emanating from the area of the workpiece...
Beam diagnosis and simulation for laser materials processing (1998)
Dahmen, M., Schulz, W., Kostrykin, V., Poprawe, R.
An important element of the processing chain of laser material processing is the laser beam. To ensure the process capability of this tool its spatial and temporal behavior as well as its effects on...
Verfahren zum Bearbeiten von Werkstuecken mit Laserstrahlung (1997)
Zefferer, H., Schulz, W., Schneider, F., Petring, D., Preissig, K.U.
A free boundary problem related to laser beam fusion cutting. ODE approximation (1997)
Schulz, W., Kostrykin, V., Zefferer, H., Petring, D., Poprawe, R.
The laser beam fusion cutting process is described with a three-dimensional free boundary problem for the motion of one phase boundary. Its variational formulation is presented. An ODE approximation...
Observation of events with an energetic forward neutron in deep inelastic scattering at HERA (1996)
Derrick, Malcolm, Krakauer, D A, Magill, S, Mikunas, D, Musgrave, B, Okrasinski, J R, ...
Produkte mit integrierter photovoltaischer Energieversorgung (1996)
Amann, J., Gieshoff, J., Kuhmann, J., Kügele, R., Roth, W., Schulz, W., ...
Powerful features for LBW including theoretical aspects (1996)
Schulz, W., Fürst, B., Kaierle, S., Turichin, G., Kreutz, E.W., Poprawe, R.
The performance of laser beam welding strongly depends on the education of the machine operator. The development of processing parameters for each machine installation and trouble-shooting are time...
Laser beam welding with CALAS software-supported process planning and control (1996)
Dahmen, M., Fürst, B., Kaierle, S., Kreutz, E.W., Poprawe, R., Schulz, W., ...
Software supported process planning and quality assurance are of main importance for the realization of a manufacturing method in laser beam welding. A novel software tool for process planning and...
Exclusive $\varrho^{0}$ production in deep inelastic electron-proton scattering at HERA (1995)
Derrick, Malcolm, Krakauer, D A, Magill, S, Mikunas, D, Musgrave, B, Repond, J, ...
Inclusive jet cross sections for events with a large rapidity gap with respect to the proton direction from the reaction ep \rightarrow jet \; + \; X with quasi-real photons have been measured with...
Kiowski, W, Löffler, K, Middeke, M, Schulz, W, ...
In a double-blind, randomized, multicenter trial, we compared the efficacy and safety of the fixed combination of 5 mg ramipril and 6 mg piretanide and the respective component monotherapies in...
Franke, J., Schulz, W., Herziger, G.
Process for the removal of material from metallic workpieces (10) with tool movement relative to the workpieces, in particular for the cutting of metal sheets, by which the surface (11) of the...
A tool for efficient laser processing (1995)
Beyer, E., Dahmen, M., Fuerst, B., Kreutz, E.W., Nitsch, H., Schulz, W.
Observation of hard scattering in photoproduction events with a large rapidity gap at HERA (1994)
Derrick, Malcolm, Krakauer, D A, Magill, S, Musgrave, B, Repond, J, Schlereth, J L, ...
Inclusive jet differential cross sections in photoproduction at HERA (1994)
Derrick, Malcolm, Krakauer, D A, Magill, S, Musgrave, B, Repond, J, Schlereth, J L, ...
A search for excited fermions in electron-proton collisions at HERA (1994)
Derrick, Malcolm, Krakauer, D A, Magill, S, Musgrave, B, Repond, J, Schlereth, J L, ...
Measurement of the proton structure function F$_{2}$ from the 1993 HERA data (1994)
Derrick, Malcolm, Krakauer, D A, Magill, S, Musgrave, B, Repond, J, Schlereth, J L, ...
Die Rolle der exothermen Reaktion beim Laserstrahlbrennschneiden (1994)
Franke, J., Schulz, W., Petring, D., Beyer, E.
Die exotherme Reaktion des Eisens mit dem Schneidsauerstoff hat einen bedeutenden Einfluß auf die Prozeßstabilität und die erreichbaren Schneidleistungen beim Laserstrahlbrennschneiden. Einerseits...
Evaporation in deep penetration welding with laser radiation (1994)
In deep penetration welding most of the molten material does not cross the keyhole as vapour but has to be accelerated around it. The driving force for this acceleration is assumed to be given by the...
Laser beam fusion cutting: Diagnostics and modelling of melt drag and ripple formation (1994)
Zefferer, H., Petring, D., Schulz, W., Schneider, F., Herziger, G.
Ein neues Laserstrahl-Schneideverfahren für Blechdicken bis 80 mm (1993)
Franke, J.W., Schulz, W., Herziger, G.
Das Laserstrahlbrennschneiden ist inzwischen seit vielen Jahren ein bewährtes Verfahren in der Industrie zum Trennen von Strahlblechen mit hoher Schnittqualität und Vorschubgeschwindigkeit. Die...
Zefferer, H., Petring, D., Schulz, W., Schneider, F., Herziger, G.
Beim Laserstrahlschmelzschneiden führt die Dynamik der physikalischen Prozesse im Schneidfrontbereich und im Schmelznachlauf zur Riefenbildung. Beim Hochgeschwindigkeitsschneiden umschließt die...
Laserstrahlbrennschneiden niedriglegierter Stahlbleche bis 80 mm Dicke (1993)
Franke, J., Schulz, W., Beyer, E.
In diesem Beitrag wurde gezeigt, daß die maximal schneidbare Blechdicke beim Laserstrahlbrennschneiden niedriglegierter Stähle nicht von der Laserleistung abhängt, sondern nur davon, ob ein...
Heat conduction losses in laser cutting of metals (1993)
Schulz, W., Becker, D., Franke, J.W., Kemmerling, R., Herziger, G.
Using the model of a cylinder-type heat source, the power loss owing to heat conduction in laser cutting and welding of metals is calculated analytically. The case of laser cutting is described by...
Abbrandstabilisiertes Laserstrahlbrennschneiden - ein neues Verfahren (1993)
Franke, J.W., Schulz, W., Herziger, G.
Am Fraunhofer-Institut für Lasertechnik wurde ein neues Laserstrahlschneidverfahren entwickelt. Damit können dickere Bleche als bisher mit hoher Prozeßsicherheit, schneller Vorschubgeschwindigkeit...
Charged particle spectra in oxygen-induced reactions at 14.6 and 60 GeV/nucleon (1990)
Adamovich, M I, Aggarwal, M M, Arora, R, Alexandrov, Yu A, Azimov, S A, Badyal, S K, ...
A study of recoil protons in ultra-relativistic nucleus-nucleus collisions (1990)
Adamovich, M I, Aggarwal, M M, Arora, R, Alexandrov, Yu A, Basova, E, Bhalla, K B, ...
Target nucleus fragmentation in $^{16}O + (Ag, Br)$ interactions at 200 AGeV (1990)
Adamovich, M I, Aggarwal, M M, Arora, R, Alexandrov, Yu A, Basova, E, Bhalla, K B, ...
Production of helium (Z = 2) projectile fragments in $^{16}$O interactions at 200A GeV (1990)
Adamovich, M I, Alexandrov, Yu A, Asimov, S A, Badyal, S K, Basova, E, Bhalla, K B, ...
Limiting fragmentation in oxygen induced emulsion interactions at 14.6, 60 and 200 A GeV (1990)
Adamovich, M I, Aggarwal, M M, Arora, R, Alexandrov, Yu A, Azimov, S A, Basova, E, ...
On laser fusion cutting - the self-adjusting cutting kerf width (1989)
The process of laser fusion cutting depends on physical quantities which are not adjustable directly, but established by the process itself. Examples are the slope of the cutting front, the melt-film...
On laser fusion cutting - a closed formulation of the process (1989)
The process of laser fusion cutting depends on physical quantities which are not adjustable directly, but established by the process itself. Examples are the slope of the cutting front, the melt-film...
Momentum transfer of an inert gas jet to a free surface of a molten pool (1989)
Pirch, N., Schulz, W., Becker, D., Kreutz, E.W.
It can be said in summarizing, that, on the one hand, sensor technology is so far developed today that automatic fabric inspection can more than ever be regarded as feasible. In addition, the...
Adjustable redistribution of the laser intensity between two adjoining metal surfaces. (1989)
Welding of pipes and manufacturing of plated metal sheets are two applications of a laser beam in which the distribution of the absorbed intensity differs considerably from the irradiation. Laser...
Accomodation of polarization and shaping in laser beam welding (1988)
Schulz, W., Wolf, N., Welsing, O., Behler, K., Beyer, E.
In the following paper a welding technique is presented which allows to weld pipes and plates faser than with normal keyhole welding. Materials with high reflectivities e.g. aluminium, copper or...
OPTICAL BISTABILITY WITH RYDBERG ATOMS (1988)
Lange, W., Schulz, W., Walther, H., Pernigo, M., Lugiato, L.
We present an experiment on absorptive optical bistability at extremely low photon and atom numbers, making use of the strong coupling of Rydberg Rb atoms to the electric field in a superconducting...
OPTICAL BISTABILITY WITH RYDBERG ATOMS (1988)
Lange, W., Schulz, W., Walther, H., Pernigo, M., Lugiato, L.
We present an experiment on absorptive optical bistability at extremely low photon and atom numbers, making use of the strong coupling of Rydberg Rb atoms to the electric field in a superconducting...
On laser fusion cutting of metals (1987)
Schulz, W., Simon, G., Urbassek, H.M., Decker, I.
The laser fusion cutting of metals is modelled theoretically for high cutting velocities assuming that light absorption occurs according to the classical Fresnel formulae. For a beam polarised in the...
Influence of the oxidation process in laser gas cutting (1987)
Schulz, W., Simon, G., Vicanek, M., Decker, I.
In laser gas cutting an appreciable fraction of the required energy flow density is contributed by the chemical reactions. As known from autogenous gas cutting two different mechanism controlled...
Ablation of laser irradiated metal surfaces (1987)
Schulz, W., Simon, G., Eißfeldt, H.
The time-development of a laser irradiated surface in the case of a high ablation rate is given by the local energy balance. The analytical solution is found by the method of characteristics. The...
Ablation of opaque surfaces due to laser irradiation (1986)
Schulz, W., Simon, G., Vicanek, M.
The time-dependent ablation process of a metal surface due to laser irradiation is investigated for the case of high Peclet numbers. An analytical solution of the energy balance equation is found by...
Muller, H.M., [Hrsg.], Bachmann, R., Baehr, W., Bregulla, E., Diefenbacher, W., ...
Hanau: NUKEM 1977. 210 S.
Bau eines linearen Verstaerkers mit schnellen Torschaltungen (1960)
Diplomarbeit. Karlsruhe 1960